WO1999032819A1

WO1999032819A1 - Inner surface repair material for pipeline and inner surface repairing method

Info

Publication number: WO1999032819A1
Application number: PCT/JP1997/004724
Authority: WO
Inventors: Shinkichi Ooka; Takeshi Nishimura; Kensuke Okamoto; Shozo Yano; Hisashi Kitajima; Hidemi Nishiyama
Original assignee: Toa Grout Kogyo Kabushiki Kaisha; The Furukawa Electric Co., Ltd.
Priority date: 1997-12-19
Filing date: 1997-12-19
Publication date: 1999-07-01
Also published as: AU3909999A

Abstract

A repair material and a repairing method, in which partial repair for faulty portions of a pipeline such as a sewerage pipe is surely effected in fewer working processes and in a short time. A repair material (1) is used which is composed of at least two layered cylinders with an elastic inner layer (2) held in an outer layer (3) in contracted condition. The repair material is introduced into a pipeline to be taken to a location where the pipeline should be repaired, and the outer layer is removed to cause spontaneous diametrical expansion of the inner layer for close adherence to an inner surface of the pipeline. In the case where the pipeline is small in diameter, the outer layer (3) is removed outside the pipeline and only the elastic inner layer (2) is introduced into the pipeline to be conveyed to a location where the pipeline should be repaired. Before the outer layer (3) is removed outside the pipeline the repair material is cooled to temporarily delay a diametrically enlarging speed of the inner layer. Conveyed to a location where the pipeline should be repaired, the inner layer is heated.

Description

Description Materials for inner surface repair of pipes and inner surface repair method

The present invention relates to a member for repairing the inner surface and a method of repairing the inner surface of a pipe buried for an existing water supply, sewer, gas, electric wire, telephone line, etc. Concerning the construction method. Technology background

For example, fume pipes and ceramic pipes are widely used as sewage pipes buried underground. The internal surfaces of these pipes are eroded by hydrogen sulfide and other corrosive gases and deposits, etc., due to long-term use, and are deteriorated, resulting in thinner pipes and lower strength. In addition, the joints of the pipelines are displaced due to ground pressure, land subsidence, etc., resulting in gaps, and cracks, etc., in some of the pipelines due to the overload, etc. Intrusion or running water flowing through the pipeline may leak into the ground. There is a risk that earth and sand around the pipeline will flow out due to infiltration or leakage of such groundwater into the pipeline and a cavity will be created on the back of the annular body, causing road surface collapse and the like.

In the case of gas mains, for example, if the joints are loosened due to ground deformation, etc. over a long period of time, or if a large-scale earthquake or other large impact is received, the joints of the pipelines Can be damaged and gas can leak from loose or damaged defective parts. Conventionally, as a member for partially repairing a defective part in the above pipeline, a base made of a metal material with excellent corrosion resistance such as stainless steel, and wound in a cylindrical shape with both ends overlapped There is a repair material consisting of a plate and a water-impervious, elastically deformable sleeve wrapped around the plate, and this repair material is used when repairing a defective part in a pipeline after it has been transported to that location. When the diameter of the elastic sleeve is increased by a diameter expander such as a packer, and the elastic sleeve is pressed against the inner surface of the defective pipe, and the operation of the diameter expander is released in a state of being appropriately compressed, the compressed elastic sleeve rebounds. The base plate receives pressure in the direction to reduce the diameter of the base plate, and a large number of hooks formed on the overlapping end of the base plate and the hooks Attachment is performed by engaging a pair of a hook and an opening that are closest to each other so as to prevent the base plate from being reduced in diameter.

Although this repair element is effective in itself, it requires the use of a diameter expander to operate it, and there is room for improvement in the cost and effort required. As another method for repairing a defective part in a pipeline, a repair material in which a liquid hardening resin is impregnated and laminated on a reinforcing material made of a nonwoven fabric made of glass cloth or polyester fiber is wound around a packer-like repair machine. Then, there is a method of guiding the pipe to the installation location, sending compressed air to the packer, pressing the repair material on the inner wall of the installation location, and then curing the curable resin.

In this conventional method, as described above, a reinforcing material such as glass fiber impregnated with a curable resin is used, but the curable resin differs in curing time depending on the outside air temperature, and the curing time depends on the work. It is necessary to match the time required, and it will cause problems if it is too early or too late (If it is too early, curing will start during the work, and if it is too late, resin will sag after crimping on the inner wall of the pipeline) , Each time, the curing agent must be prepared at the site so that the curing time is appropriate to the situation at the time, so there is a problem that the work takes time and labor, and the proper preparation was performed. Even so, it is difficult to always obtain uniform repair results.

In addition, since the liquid resin is impregnated into the glass cloth or the nonwoven fabric, if the pressure by the repair machine is applied too much, the impregnated resin may be squeezed out, and there may be a case where insufficient impregnation occurs. In addition, a thin layer of resin alone is formed at both ends of the repair material in the pipe axis direction due to the structure and operation of the packer as a repair machine, and a peeling phenomenon easily occurs from this portion.

Furthermore, in the method of forming a resin layer on the inner surface of a pipeline using glass fiber and light or thermosetting resin, the resin after curing is about 2 to 8% less than before curing in the process of curing the resin. Heat shrinkage may occur. Therefore, even when the lining is in close contact with the lining, the solidification and shrinkage may cause peeling and gaps as it cures.

Therefore, according to the present invention, a solid repair effect can be permanently obtained with a simple repair work. It is intended to provide a member for repairing the inner surface of a pipeline and a method for repairing the inner surface, which makes it possible to do so.

In addition, the present invention makes it possible to transport the inner layer as a repairing member to a repair-required portion without difficulty even in a case where a person cannot enter and work, for example, a pipeline having an inner diameter of 700, Moreover, the purpose is to ensure that effective repairs are achieved. Disclosure of the invention

The pipe repairing member of the present invention according to claim 1, which achieves the above object, comprises at least two layers of a cylindrical body, and the inner layer is repaired in an unconstrained state where the internal stress is minimized. The outer layer is made of a cylinder having an outer diameter smaller than the inner diameter of the pipe, and the inner layer is formed by a mechanical force on the outer layer. The inner layer is held in a state where expansion is prevented, and the cross section of the inner layer in a direction perpendicular to the axis of the conduit is substantially similar to the contour of the inner periphery of the conduit. It is characterized by the following.

The inner surface repair member according to the present invention, which is transported to the required repair point in the pipeline, has the outer layer removed at the same point, and only the inner layer made of the elastic body is left, and the internal stress force tends to be minimized. Due to the nature of the inner layer, even if no energy such as heat or electricity is given from the outside, it expands spontaneously and tries to return to the open state larger than the inner diameter of the pipe. Even after the repair is completed, the state where the internal stress is not minimal is maintained and the internal stress is always remaining, so the adhesion to the inner peripheral surface of the pipeline is always maintained, and peeling may occur. In addition, the problem of disengagement can be completely avoided, and the effect that the work can be performed simply and easily can be obtained since a diameter expanding machine is not required. In actual repairs, the inner layer expands inside the pipeline, so the outer diameter does not become larger than the inner diameter of the pipeline, but the inner layer itself has the potential to expand further. It does not shrink permanently after installation. In addition, since the inner layer of the repair member has a cross section in a direction perpendicular to the pipe axis that is substantially similar to the inner circumference of the pipe, the elastic restoring action at the time of diameter expansion is performed almost uniformly as a whole. Therefore, uniform adhesion to the inner peripheral surface of the pipe is obtained. And since the repair parts can be managed and produced in the factory, the quality is constant, reliable repair is possible, and mass production is possible. Thus, the effect that the cost can be reduced is obtained.

The member for repairing an inner surface of the present invention according to claim 2 is composed of at least two layers of a cylindrical body, and has an outer diameter of d1 when the inner layer exists alone, and an outer diameter of the inner layer in a two-layer state. Where d2 is the outer diameter of the outer layer, d3 is the outer diameter of the inner layer that constitutes the repair material after the repair is completed, and D is the inner diameter of the existing tubular body.

d2 <d3 <d4 = D <d l

Relationship, and

d 2 / D = 0.5 to 0.93,

d 3 / D = 0.6 to 0.95,

d 1 / D = 1.01 to 1.2,

D = 50-800mm

It is characterized by being.

According to this configuration, the present invention can be more effectively applied to an existing pipeline, that is, a pipeline having an inside diameter of 50 to 800 mm in which no person can enter the pipe.

The repair member according to claim 3, wherein the main material of the inner layer is polyethylene or cross-linked polyethylene, and the outer layer is a sleeve made of anticorrosion-treated iron, stainless steel, or an aluminum alloy. According to this configuration, since the inner layer is made of such a material, the compressibility and the elastic restoring property are particularly good, and the inner layer adheres to the inner peripheral surface of the pipeline. It is particularly well-maintained, and the outer layer firmly holds the inner layer in the reduced diameter state, and when mass-produced and stored for repair, it is difficult to crack, and its function can be maintained for a long time and at the same time iteratively It can also be used.

The repair member according to claim 4 is characterized in that the outer layer is a cylindrical body mainly composed of paper. The paper is lightweight and has excellent impact resistance, so it is easy to carry the repair parts at the construction site, and it is hard to break if dropped too much. In addition, if it is made of paper, the outer layer can be easily removed with a simple device. In addition, paper is economical and easy to dispose of after removal.

As described in claim 5, the material of the inner layer as the repairing member in the present invention is preferably made of resin, and polyethylene having a density of 0.890 to 0.950 is suitable. ing. Particularly, low-density polyethylene of 0.91 to 0.935 is suitable. The reason for this is that the lower the density, the more uniform the diameter can be reduced, and the greater the recoverability of the diameter after removing the outer layer, the smaller the diameter can be designed. It is. However, if the density is less than 0.890, the inner layer will have a small force to push the inner surface of the pipeline, and after the repair is completed, it may not be able to withstand the water pressure or earth pressure that enters from the damaged part of the pipeline. Therefore, polyethylene having a density in this range is most suitable. The repair member according to claim 6 is characterized in that a water-stop ring is attached near an end of the inner layer. According to this configuration, the inner layer is formed in a pipeline, for example, a location where a crack occurs in a sewer pipe. When attached to the groundwater, even if there is groundwater that penetrates around the inner layer through cracks, the inflow into the sewer pipe is reliably stopped by the water stop ring.

The repair member according to claim 7 is characterized in that the water blocking annular body is made of styrene butadiene rubber or a porous plastic having elasticity and high water stopping function, so that the repair member and the pipe are connected to each other. It is deformed quickly and provides an effective water stop function for a long time.

The repair member according to claim 8 is provided with a slope force that extends outward in the axial direction at an end of the inner layer. According to this configuration, when the inner layer is installed in the pipeline, the repair member is used for repair. The smooth flow of water or the like is not hindered by the ends of the members.

The repair member according to claim 9 is characterized in that a lubricant is applied between the inner layer and the outer layer, and according to this configuration, the repair member is provided at the repair target portion in the pipeline. When removing the outer layer, the extraction work can be performed smoothly.

The repair member according to claim 10, wherein the sleeve as the outer layer is formed of two portions each having a semicircular cross section divided in a longitudinal direction, and one of the semicircular portions protrudes. The mating edge is connected to the hinge, and the other butting edge is provided with a tongue piece which is folded back along the outer peripheral surface, respectively, and a sleeve is provided at the edge of the both folded tongue pieces. On the other hand, it has an arcuate coupling piece having an engagement edge portion slidably engaged in the axial direction of the sleeve. When the outer layer is removed from the repair member at the location, the outer layer can be removed very easily by first extracting the arc-shaped connecting piece and then opening the two semicircular portions with the hinge as a fulcrum. In order to achieve the above object, the repair method of the inner surface of the pipeline according to claim 11 is to repair the tubular repair member for the pipeline in the axial length L, the thickness T, and the repair. When the inside diameter of the pipe is D,

L / D = 0. 1 2—1 0

T / D = 0.01 to 0.09

By using a repair member that is capable of spontaneously expanding and deforming, the repair member whose diameter d 1 in the unconstrained state is d 1> D is reduced in diameter, and the outer diameter d 2 after reducing the diameter is d 2 <D, while maintaining the reduced diameter state, transport the repairing member to the required repair location in the pipeline, release the reduced diameter state at that point, and spontaneously expand the repairing member. This method is characterized by causing radial deformation and bringing it into close contact with the inner peripheral surface of the pipeline. According to this method, a repair member suitable for the pipeline diameter of the pipeline can be prepared. A stable adhesion with a uniform force is obtained, and efficient repair is possible without waste of materials.

The method for repairing the inner surface of a pipeline according to the present invention according to claim 12 is composed of a tubular body having at least two layers, and the inner layer is a pipe to be repaired in an unconstrained state where internal stress is small. The outer layer is formed of an elastic body having an outer layer larger than the inner diameter of the passage, the outer layer is formed of a cylindrical body having an outer diameter smaller than the inner diameter of the pipe, and the inner layer is prevented from expanding by the outer layer by mechanical forcing. In addition, the inner layer uses a repairing member whose cross section in a direction perpendicular to the axis of the pipeline is substantially similar to the inner periphery of the pipeline. It is transported to the required repair location in the pipeline, only the outer layer is removed at that location, and spontaneous radial expansion deformation of the elastic body that constitutes the inner layer in the direction in which the internal stress is reduced, causing Close the inner surface with internal stress remaining According to this method, the repair parts produced in the factory are sent to the site, transported to the required repair points in the pipeline, and the outer layer is removed to complete the repair. Repair work can be performed efficiently and easily.

The repair method for the inner surface of the pipeline according to claim 13 uses a vehicle that has a gripper that grips both ends of the repair member and maintains a reduced diameter state, and that runs in the pipeline, The gripper of this vehicle grips both ends of the repair member in the reduced diameter state, moves the vehicle toward the required repair point in the pipeline while maintaining the reduced diameter, and after reaching the repair required point, replaces the repair member. Release from gripping state by gripper, spontaneous use of repair members According to this method, the work of bringing the repairing member to the repair-required portion and releasing the repairing member can be performed quickly and easily.

The repair method for the inner surface of the pipeline according to claim 14 is constituted by at least two layers of the cylindrical body, the inner layer of the repair member is made of an elastic material, and the internal stress force is minimized. In this state, the outer layer has an outer diameter larger than the inner diameter of the pipe to be repaired, the outer layer has an inner diameter smaller than the inner diameter of the pipe, and the inner layer expands the outer layer by mechanical forcing. The inner layer is maintained in a blocked state, and the inner layer uses a repairing member having a cross-sectional shape perpendicular to the axis of the pipeline that is substantially similar to the contour shape of the inner circumference of the pipeline. After removing the outer layer, only the inner layer is inserted into the pipeline, transported and installed to the required repair point of the pipeline, causing spontaneous radial expansion in the direction of reducing internal stress, The inner surface repair is completed with internal stress remaining. .

Immediately before the inner layer is inserted and conveyed into the pipeline, the outer layer preventing its diameter from being expanded is removed. Then, only the inner layer is put into the pipeline, quickly transported to the required repair location, and installed at the specified location. Since the inner layer made of an elastic material expands in diameter to minimize the internal stress, it can be stuck to the inner surface of the area requiring repair, and the area can be repaired.

In this method, when the outer layer is removed, the inner layer gradually expands in diameter. Therefore, the inner layer must be transported to a specified location while the outer diameter of the inner layer is at least smaller than the inner diameter of the pipeline. Since there may be a step at the junction of the pipelines, it is preferable that the clearance between the inner layer outer diameter and the pipeline inner diameter be as large as possible during transportation. In order to increase the clearance, the inner layer must be reduced in diameter. However, if the diameter is reduced excessively, the expandability after removing the outer layer becomes worse, and the pipe does not adhere to the inner surface of the pipe. In other words, the outer diameter of the inner layer is small until the outer layer is removed and the inner layer is installed at the required repair location of the pipeline, and after installation, it is required to expand the diameter until it comes into close contact with the inner surface of the pipeline. Therefore, in order to secure the clearance during the inner layer transport for a long time, according to the method of claim 15, the two-layer repair member is cooled before the outer layer is removed. By doing so, it is possible to temporarily slow down the expanding speed of the elastic body of the inner layer immediately after removing the outer layer, and to further increase the clearance until the elastic body is transported to the repair-required portion. Since it can be held for a long time, it can pass through the step formed at the joint of the pipeline, and can be transported to a predetermined location without any trouble.

The method according to claim 16 is characterized in that even after the outer layer is removed, the inner layer is cooled until the transfer is completed. By doing so, the diameter of the inner layer after the outer layer is removed can be further delayed, and even if the distance to the required repair point in the pipeline is relatively long, smooth transport is possible.

Further, as in the method according to claim 17, a means for heating the elastic body after the inner layer is installed at a repair-required portion of the pipeline is adopted. By doing so, not only can the speed of expanding the elastic body be increased and the elastic body can be brought into close contact with the pipe, but also the diameter that the inner layer can reach can be increased. In addition, even when lining the step portion of the pipeline, the inner layer follows the step portion, ensuring water stoppage, and being able to adhere to the pipeline in a short time. Regarding the heating method, any method may be used, and hot air, hot water or light heat may be applied. In the case of polyethylene, the surface temperature of the inner layer during heating is preferably from 20 to 100 ° C, and more preferably from 40 to 70 ° C. Below 20 ° C, the effect of increasing the expanding speed is small, and above 100 ° C, the rigidity of the inner layer becomes too low, which may cause flattening due to its own weight or loss of expanding force. Because. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view of one embodiment of a member for repairing the inner surface of a pipe according to the present invention. FIG. 2 is an end view showing a relationship between the repair member of FIG. 1 and a pipeline to be repaired. FIG. 3 is a partial perspective view showing three embodiments of the inner layer of the repair member. FIG. 4 is a diagram for explaining the end configuration of the inner surface repair member (inner layer) installed at the repair location in relation to the pipeline.

FIG. 5 is a schematic diagram illustrating an example of a method for manufacturing a repair member according to the present invention. FIG. 6 is a perspective view showing another embodiment of the outer layer of the repair member.

FIG. 7 is a perspective view showing still another embodiment of the outer layer of the repair member.

FIG. 8 is a partial perspective view showing still another embodiment of the outer layer of the repair member. FIG. 9 is a perspective view showing an elastic pipe which is advantageous as an inner surface repairing member of the present invention. FIG. 10 is a schematic perspective view showing an example of a repair device for performing an inner surface repair operation using the inner surface repair member shown in FIG.

FIG. 11 is a perspective view (a) of an inner layer or an elastic inner surface repairing member fitted with a water blocking annular body, and FIGS. 11 (b) and (c) showing a part of an axial longitudinal sectional view thereof.

FIG. 12 is a perspective view showing another embodiment of the repair member of the present invention.

FIG. 13 is a partial perspective view showing another embodiment of the outer layer of the repair member according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing one embodiment of the repair member 1 of the present invention, in which 2 is an inner layer as an inner surface repair member made of a cylindrical elastic body, and 3 is a cylinder holding the inner layer. In the illustrated state, the inner layer 2 is accommodated in the outer layer in a reduced diameter state.

The material constituting the inner layer 2, that is, the member for repairing the inner surface, has elasticity, such as polyethylene, cross-linked polyethylene, polypropylene, ethylene vinyl acetate, ethylene copolymer such as ethylene methacrylic acid, and other multi-component copolymers. In consideration of the long-term strength of the inner surface repair member, which is applicable to a wide range of thermoplastic resin materials, it is particularly preferable to use polyethylene or cross-linked polyethylene.

The outer layer 3 is preferably made of a so-called paper tube in which paper is a main material and a plurality of papers are laminated. The material constituting the outer layer 3 is not limited to paper, but may be, for example, stainless steel, aluminum alloy, corrosion-resistant steel, ceramic, plastic such as hard vinyl chloride, or the like. . It may be a stainless steel, aluminum alloy, or corrosion-resistant iron sleeve. It may be made of composite materials such as FRP, engineering plastics, and other high-strength materials. Further, the sleeve can be a thin plate, a perforated plate, a mesh-like one, or the like.

As described above, the inner layer 2 of the repair member 1 is held in the outer layer 3 in a reduced diameter state, but in a free state before being fitted into the outer layer 3, as shown in FIG. It has an outer diameter d1 that is larger than the inner diameter D of the road 4, and in that state, Partial stress is minimized. Such an inner layer 2 is confined by mechanical forcing so as to have an outer diameter of d2 in an outer layer 3 having an outer diameter d3 smaller than the inner diameter D of the pipeline 4, and is in close contact with the outer layer 3. It is in a situation of constantly expanding its diameter and trying to return to the normal (open) state.

Therefore, when the outer layer 3 is removed, the inner layer 2 spontaneously expands so as to reduce the internal stress, adheres tightly to the inner peripheral surface of the pipeline 4, and the force for expanding the diameter is suppressed, and the remaining The distortion always remains. In other words, a radial force is constantly acting to expand the diameter, and the internal stress is maintained at a state where it is not minimal. The above-mentioned spontaneous is synonymous with the spontaneous change of the second law of thermodynamics, and the internal stress of the elastic body itself can be obtained without applying external energy (heat, water pressure, gas pressure, electricity, light, etc.). Means the nature of trying to reach a minimum.

In the case of pipes with a pipe inner diameter D of 50 to 80 Omm, where humans cannot enter and work, the above dl, d2, d3 and the outer diameter of the repair member (inner layer) after the repair is completed are d4. In doing so, it is preferable that they have the following relationship.

d2 <d3 <d4 D <d l (1)

d 2 / D = 0.5 to 0.93 (2)

d 3 / D = 0.6 to 0.95 (3)

d 1 / D = 1.01 to 1.2 (4)

The above (1) represents the state shown in FIG. In the above (2), if d2 / D <0.5, the diameter reduction ratio becomes large, the resilience becomes insufficient, and the adhesion after the repair is completed becomes insufficient. If dZ / DX). 93, the diameter of the entire repair material will be large, making it difficult to transport inside the pipeline. In (3) above, as in (2), if d3 / D <0.6, the adhesion after completion of the repair will be insufficient, and if 013 0> 0.95, the pipe Is difficult to transport. In (4) above, if d lZD <l. 01, the internal stress becomes insufficient, and the adhesion after the repair is completed becomes weak. If d lZD> l. 2, the diameter reduction ratio must be increased. Yes, resilience is inadequate.

Although the case where the inner layer 2 is cylindrical is illustrated and described, as shown in Fig. 3, it is cylindrical and has an arch shape (a), a hexagonal shape (b), an oval shape or an oval shape (c). Datsu Or a polygon other than a hexagon. In each case, the cross-sectional shape in the direction perpendicular to the axis of the pipeline 4 is substantially similar to the contour shape of the inner circumference of the pipeline.

As shown in FIGS. 4 (a) and 4 (b), an inclined surface (taper) 5 extending outward in the axial direction is formed at the end of the inner layer 2, and the taper angle 0 is 1 0 ° <0 <80 °, preferably 25 ° to 60 °.

The above-mentioned repair member 1 can be mass-produced in a factory as follows. That is, as shown in FIG. 5, for example, a polyethylene pipe 6 formed by extrusion molding and then cooled, for example, after a tension member 8 is attached to the tip, is pulled and substantially similar to the same. It is passed through a shaped ring 7 and reduced to the required diameter. The ring 7 may be provided with polyethylene tube heating means. A metal sheath tube 9 having a predetermined length is arranged after the ring 7, and the reduced-diameter polyethylene tube is drawn into the metal sheath tube 9. After the reduced-diameter polyethylene pipe has been drawn into the metal sheath pipe 9 over its entire length, the work of arresting the bow is stopped, and then the polyethylene pipe spontaneously expands somewhat to the inside of the metal sheath pipe 9. After being in close contact with each other, it is cut into a desired length using a cutting machine at a location indicated by arrows c1, c2, cn + 1. The obtained individual cut pieces a 1, a 2,..., A n serve as repair members. Cutting may be performed immediately after the ring 7 or at another location. When the sleeve as the outer layer 3 is reused, when connecting the sleeve to the sheath tube, insert a spacer between the sleeve and the sleeve, and cut at the spacer part. You may. When the repair member 1 is manufactured by the mass production method described above, it is advantageous that the outer layer is formed of a metal sleeve. In that case, it is preferable to interpose a lubricant between the metal sleeve and the polyethylene pipe. The metal sleeve is preferably made of corrosion-resistant iron, stainless steel, or an aluminum alloy, but a sleeve made of a plastic material or other material can be used instead of the metal sleeve. The sleeve as the outer layer may take other forms shown in FIGS. 6 to 8.

The sleeve shown in FIGS. 6 (a) to 6 (c) is composed of two parts 3a and 3b which are divided in the longitudinal direction and have a semicircular cross section, and these semicircular parts 3a and 3b One end of the The joining edges are hinged together by hinges 3c. A tongue piece 3d is formed on the other butted edge portion, which is folded back along the outer peripheral surface. The sleeve further has an arcuate connecting piece 3e, which has an engaging edge 3f with a U-shaped cross section slidably engaging the edge of the tongue. ing. In the state shown in FIG. 6 (a), the sleeve holds the elastic inner layer 2 in a reduced diameter state, and pulls out the arc-shaped connecting piece 3e in the axial direction indicated by the arrow at a repair required portion in the pipeline. As shown in Fig. 6 (b), the semicircular portions 3a and 3b are opened with the hinge 3c as a fulcrum, and then the opened semicircular portion is removed, leaving only the inner layer there. The diameter is spontaneously expanded and closely adheres to the inner peripheral surface of the pipeline to repair defective parts. In order to remove the arc-shaped connecting piece 3e and the semicircular portions 3a and 3b, small holes 3g and 3h are provided at the ends of the members for connecting to the pulling ropes, respectively. The semicircular portions 3a and 3b are connected by a string or similar member 3i near the tongue piece 3d so that the open semicircular portions 3a and 3b do not open more than necessary. . Also, as shown in Fig. 6 (c), the semicircular portions 3a and 3b are reinforced by applying a corrugating force by a press.

Fig. 7 shows the deformation of the sleeve.Folded tongue pieces 3d are formed at both butting edges of the semicircular portions 3a and 3b, and a pair of adjacent folded tongue pieces 3d is formed. They are joined by the above-mentioned arc-shaped joining pieces 3e. In order to open the semicircular portions 3a and 3b during the repair work, one or both of the arc-shaped connecting pieces 3e are withdrawn. FIG. 8 shows another deformation of the sleeve, in which the upper and lower butted edges of the semicircular portions 3a, 3b are connected by a pin 3j, and when this pin is pulled out in the axial direction, The connection state is released and the sleeve is opened. According to another aspect attributable to the material properties of the inner layer material of the present invention, the object of the present invention can also be achieved by the following method.

That is, in the inner layer (inner surface repair member) or the elastic pipe 10 shown in Fig. 9, when the axial length of the pipe is L, the thickness is T, and the inner diameter of the pipe to be repaired is D. ,

L / D = 0.12 ~ 10, preferably 0.4 ~ 2, (5) T / D = 0.01 ~ 0.09, preferably 0.01 25 ~ 0.03 (6) The diameter of the elastic pipe 10 whose outer diameter d 1 in the unconstrained state is d 1> D is reduced. So that the outer diameter d2 after diameter reduction is such that d2 <D, and while maintaining the reduced diameter state, the elastic pipe is transported to the required repair location in the pipeline, where the reduced diameter state is maintained. Is released, causing spontaneous expansion deformation of the elastic pipe and bringing it into close contact with the inner peripheral surface of the pipe. The above equation (5) is a condition for keeping the elastic pipe 10 uniformly reduced in diameter, expanded in diameter, and required adhesion strength. If LZD <0.12, the pipe length is too short, There is a problem that pipes tend to buckle in the diameter state. If LZD> 10, the adhesiveness in the length direction tends to be non-uniform, and material is likely to be wasted as a partial repair.

Regarding the above equation (6), if TZD 01.01, it is difficult to secure a sufficient adhesion strength and a safety factor against water pressure because of the thin wall. It is necessary that the strength of the adhesion does not come off even with a high-pressure water jet for cleaning the inside of the pipeline, and that it can sufficiently cope with the groundwater pressure on the repair member from outside the pipeline. If TZD> 0.09, it becomes thicker, causing a decrease in the amount of flowing water, resulting in excessive strength against water pressure and waste of materials.

The above-mentioned elastic pipe 10 is used as an inner layer in combination with each of the above-mentioned outer layers. From another viewpoint for effectively performing the method of the present invention, the repair device shown in FIG. 10 is used. It can be used as a substitute for the outer layer to achieve its intended purpose. This device has a pair of opposing grip members 11, each grip member having a plurality of grip arms 11 b extending radially from a central hub 11 a, and a tip of each grip arm. A grip 11 c for gripping the peripheral portion of the elastic pipe 10 is provided. Each grip member 11 is supported by a support shaft 12 so as to be movable in its axial direction. In order to move the pair of grip members 11 away from each other and in the direction in which they approach each other, a female screw is formed on the hub 11a, and a male screw is formed on the support shaft 12, so that they engage with each other. The external threads for both grip members are counter-threaded.

The support shaft 12 is supported at both ends by bearing members 14 supported by a pair of wheels 13, respectively, and is further coupled to forward / reverse rotation driving means (not shown) at at least one end.

In order to move the grip members 11 with respect to each other, Instead of the step, a piston means may be used.

A method for repairing a defective portion of a pipeline using the above repair device will be described. First, the elastic pipe 10 reduced in diameter by the diameter reducing die shown in FIG. It is set on the repair device so that the peripheral edges of both ends are grasped by 1. In some cases, an open elastic pipe 10 within the above dimensions is placed between both grip members 11 and the pipe edge is gripped by the grip 11 c of the grip member 11. Then, the support shaft 12 may be rotated to move the two grip members 11 away from each other, and the flexible pipe 10 may be stretched to reduce the diameter.

The repair equipment holding the elastic pipe whose diameter has been reduced so that d2 <D as described above will be carried into the pipeline through manholes and open locations in the pipeline. The repair equipment is moved to the required repair point while guiding with the TV camera separately attached to the mobile vehicle. Next, when the grip 11c of the gripping member 11 of the repair device that has reached the repair location is released and the reduced-diameter elastic pipe 10 is released, the pipe spontaneously expands in diameter, and finally the inner surface of the pipeline Adhere to The empty repair equipment is then recovered and the repair work is completed.

In each of the above embodiments, as shown in FIG. 11 (a), the inner layer 2 or the elastic pipe 10 is fitted with the water-stop ring 15 near both ends thereof. Reference numeral 15 denotes a ring-shaped member formed of a styrene-butadiene rubber, a water-swellable rubber, a sponge, a plastic foam, or a curable liquid water-swellable rubber-impregnated belt. This annular body may be simply fitted around the inner layer 2 or the elastic pipe 10 as shown in FIG. 11 (b), but may be fitted as shown in FIG. 11 (c). It may be fitted into a circumferential groove formed on the outer periphery of the body pipe 10. FIG. 12 is a perspective view showing another embodiment of the repair member 1 used in the method of the present invention, in which 2 is a cylindrical inner layer made of an elastic material, and 3 is a cylindrical inner layer holding the inner layer. Is the outer layer. In the state shown in the figure, the inner layer 2 is accommodated in the sleeve 3 as the outer layer in a reduced diameter state, and the inner layer tries to expand the diameter in the direction of minimizing the internal stress, that is, in the direction of increasing the diameter. Is suppressed by the sleeve 3. The inner layer 2 is preferably made of a resin mainly composed of polyethylene having a density of 0.920. The density of polyethylene is not limited to this value, but is 0. 890 to 0.995, preferably 0.910 to 0.935 is suitable. The reason is that, in the case of high-density polyethylene with a density of 0.950 or more, it is difficult to reduce the diameter uniformly when the diameter reduction rate is increased, and the diameter expansion is lower than that of low-density polyethylene. It is. If the density is less than 0.890, after the repair is completed, the force of the resin inner layer pressing on the inner surface of the pipeline is small, and it will not be able to withstand the pressure of water or soil that enters from the damaged part of the pipeline after the repair. Because there are cases. The degree of crystallinity corresponding to this density range is 60 to 85%. Further, as the material of the inner layer, a polyolefin resin other than polyethylene can be used.

Further, the sleeve as the outer layer is cut in the axial direction, and if the hose band 16 fixing the sleeve is removed, the inner layer can be easily taken out from the cut surface 3k by hand to take out the inner layer. Further, as shown in FIG. 13, a structure in which the sleeve is closed by a buckle 17 attached to the sleeve is also conceivable. In addition, the hose band 16 shown in Fig. 12 is constructed so that both ends are connected to form an annular shape, and a screw is turned around the connecting portion with a screwdriver to provide tightening and loosening action. A configuration in which a turnbuckle is provided may be used.

As described above, the inner layer 2 of the repair member 1 is held in a contracted state in the sleeve 3, but in a free state before being housed in the sleeve, as shown in FIG. The outer diameter d1 is larger than the inner diameter D of the path K. Such an inner layer is housed in a tightly closed state in a sleeve 3 having an inner diameter d2 smaller than the inner diameter D of the conduit, and the outer diameter of the inner layer in a contracted state is similar to the aforementioned d2. d 2 is preferably 0.92 D or less, more preferably 0.85 D or less. This is because the larger the clearance between the inner layer 2 and the pipeline K during transportation is, the easier it is to pass through the step formed in the pipeline and the easier the repair work is. When the inner layer 2 is housed in the sleeve 3, the inner layer 2 is constantly expanding to return to the unconstrained state. Therefore, when sleeve 3 is removed, the inner layer spontaneously expands to reduce the internal stress and adheres tightly to the inner surface of the pipe, and expands until the outer diameter becomes approximately equal to D. Since the force to expand the diameter is pressed by the pipe, residual strain remains. In other words, even after the repair is completed, a radial force is always working to expand the diameter. If there is no restriction such as a pipe, it is assumed that the inner layer expands to the outer diameter d1. Then, the following relationship is established.

d 2 <D <d 1

Example

The above-mentioned repair member 1 is used for repairing pipelines such as sewers that have become aging and have cracks or steps. The repair method is as follows. The above repair member is cooled to −50 ° C. This is to reduce the diameter expansion speed of the resin inner layer 2 immediately after removing the sleeve 3 as the outer layer, and to easily remove the inner layer. When the above-mentioned repair member is cooled, the radial expansion force of the inner layer is weakened, so that the inner layer can be easily taken out from the outer layer. In the case of the embodiment shown in FIG. 1, the inner layer can be easily removed by hand. The effect is exhibited as the cooling temperature is lower. 0 ° C or less, preferably 130 ° C or less is good. In the case of FIG. 12 and FIG. 13, it is also possible to remove the hose band 16 or the knocker 17 and take out the inner layer 2. The cooling method is not particularly limited, and may be storage in a freezer, immersion in a low-temperature medium, or the like. In the present embodiment, a method is used in which the repair member 1 is immersed in an anhydrous ethanol solution cooled by adding dry ice. The repair member having a surface temperature of −50 ° C. was taken out of the anhydrous ethanol, the sleeve 3 was removed, and as shown in FIG. 11, near the both ends of the inner layer 2, a water-stop ring 15 was formed. Be attached. This annular body is a ring formed from water-swelled rubber, styrene-butadiene rubber, sponge, or the like, and has an effect of improving the water stopping property. The inner layer fitted with the water stop ring is quickly transported to the required repair point in the pipeline. The pipe K may have unevenness such as a step at the joint.The inner layer is cooled, so the diameter expansion speed is slow and the clearance from the pipe is secured for a long time. It can be easily transported in the pipeline.

Furthermore, the inner layer is heated after being transported to the required repair location in the pipeline. The heating method is not particularly limited, and may be a general method such as hot air, hot water, or light heat. At this time, the surface temperature of the resin inner layer is preferably 40 ° C to 70 ° C. By heating the inner layer, the diameter expansion speed is increased, and the inner layer can quickly adhere to the inner surface of the pipe. In addition to this, the diameter can be expanded larger than when left at room temperature, so that the diameter can be reduced to be smaller than designed. In addition, the inner layer may be lined to the step formed at the joint of the pipeline, but heating the inner layer improves the expandability and softens temporarily. Therefore, the ability to follow steps is excellent, and higher water stopping performance can be secured. Based on the above example, a 15 mm step was made using a 200 mm fume tube, and the results of comparison of the repair performance are shown in Table 1. The repair material used was 400 mm long, and the thickness of the resin inner layer 2 was 5 mm. The inner diameter ø of the sleeve 3 is 170 mm, and the outer diameter of the inner layer 2 in an unconstrained state is 210 mm. The inner layer 2 was made of two types, low-density polyethylene (LDPE) with a density of 0.920 and high-density polyethylene (HDPE) with a density of 0.955.

The evaluation items for repair performance are transportability and external water pressure resistance. Regarding the transportability, whether the inner layer 2 can pass through the step is measured. Regarding the external water pressure resistance, the external water pressure that can withstand one hour after the inner layer is installed at the step is measured. On the inner layer, a water-stop ring 15 having a thickness of l mm is mounted. table 1

Cooling: Surface temperature-50, hold for 15 minutes

Heating: Surface temperature 50 ° C, hold for 5 minutes Effect of the invention

According to the inner surface repair member and inner surface repair method of the present invention described above, the inner surface repair member produced at the factory is transported to the site and directly transported to the repair location in the pipeline. The repair work is completed simply by removing the diameter and then reducing the diameter, and a uniform and sufficient repair effect can be obtained at all times. The effect is obtained.

If only the inner layer from which the outer layer preventing the expansion has been removed is introduced into the pipeline just before being transported into the pipeline, the inner layer is transported to the repair-required point. When transporting, the clearance with the pipeline is large, and the transport in the pipeline is performed quickly without any trouble.Especially, even if the outer layer is removed by cooling the inner layer before or during loading, even if the outer layer is removed, it is cooled. The inner layer expands slowly, and the clearance between the pipe and the inner peripheral surface of the pipe is maintained for a long time when the pipe is transported to the repair location in the pipeline, and the transport work to remote locations can be performed efficiently and smoothly. be able to.

In addition, after the repair member is transported to the repair location in the pipeline and heated, the expansion speed of the elastic body is increased, so that the work time required to complete the repair can be shortened and the remaining internal It is possible to maintain the water stopping performance for a long time due to the stress.

Claims

The scope of the claims

1. It is composed of at least two layers of cylinders. The inner layer is made of an elastic body having an outer diameter larger than the inner diameter of the pipe to be repaired in an unconstrained state where the internal stress is minimal. A cylindrical body having an outer diameter smaller than the inner diameter of the pipe, wherein the inner layer is held by the outer layer in a state where the diameter is prevented from being expanded by a mechanical forcing force; A member for repairing a pipeline, wherein a shape of a cross section in a direction perpendicular to an axis is substantially similar to a contour shape of an inner circumference of the pipeline.

2. It consists of at least two layers of cylinders, the outer diameter when the inner layer exists alone is dl, the outer diameter of the inner layer in a two-layer state is d2, and the outer diameter of the outer layer is d3, repair Assuming that the outer diameter of the inner layer constituting the repair member after completion is d 4 and the inner diameter of the pipeline is D,

d2 <d3 <d4 = D <d l

Relationship, and

d 2 / D = 0.5 to 0.93,

d 3 / D = 0.6 to 0.95,

d 1 / D = 1.01 to 1.2,

D = 50-800 mm

A member for repairing a pipeline.

3. The main material of the inner layer is polyethylene or cross-linked polyethylene, and the outer layer is an anticorrosion-treated iron or stainless steel sleeve or an aluminum alloy sleeve. Repair parts described in section.

4. The repair member according to claim 1, wherein the outer layer is mainly made of paper.

5. The inner layer made of an elastic material is made of a resin, and the resin is mainly made of polyethylene or crosslinked polyethylene having a density of 0.890 to 0.950, according to any one of claims 1 to 3, The repair member as described.

6. A water-blocking annular body is fitted near an end of the inner layer. The repair member according to any one of Items 5 to 5.

7. The repair member according to any one of claims 1 to 6, wherein a main material of the water-stop ring is styrene-butadiene rubber or porous plastic.

8. The repair member according to any one of claims 1 to 7, wherein a slope extending outward in the axial direction is provided at an end of the inner layer.

9. The repair member according to any one of claims 1 to 8, wherein a lubricant is applied between the inner layer and the outer layer.

10 0. The sleeve is composed of two parts with a semi-circular cross section, which is divided in the vertical direction. One butt edge of these semi-circular parts is hinged, and the other butt edge. Each of the edges is provided with a tongue folded back along the outer peripheral surface, and the sleeve is engaged with the edges of the two folded tongues slidably in the axial direction of the sleeve. 4. The repair member according to claim 3, wherein the repair member has an arc-shaped connecting piece having an edge.

1 1. When the axial length of the tubular repair member for pipeline is L, its thickness is T, and the inner diameter of the pipeline to be repaired is D,

L / D = 0.12-1 0

T / D = 0.01 to 0.09

Using a repair member that is capable of spontaneously expanding and deforming, the repair member whose diameter d 1 in the unconstrained state is d 1> D is reduced in diameter, and the outer diameter d 2 after reducing the diameter is d 2 <D, while maintaining the reduced diameter state, transport the repairing member to the required repair location in the pipeline, release the reduced diameter state at that point, and spontaneously expand the repairing member. A method of repairing the inner surface of a pipe, characterized by causing radial deformation and bringing it into close contact with the inner peripheral surface of the pipe body.

1 2. It is composed of at least two layers of cylinders. The inner layer is made of an elastic body with an outer diameter larger than the inner diameter of the pipe to be repaired in an unconstrained state where the internal stress is minimized. Comprises a cylindrical body having an outer diameter smaller than the inner diameter of the conduit, wherein the inner layer is held by the outer layer in a state where the diameter is prevented from being increased by a mechanical forcing force, and the inner layer is formed of the conduit. The repair material according to claim 1, wherein a cross section in a direction perpendicular to an axis is substantially similar to an inner circumference of the pipeline, and transports the repair material to a repair location in the pipeline body. At that point, only the outer layer is removed, and the elastic body that constitutes the inner layer is A spontaneous expansion deformation in the direction in which the internal stress is reduced, causing it to adhere to the inner peripheral surface of the pipeline, and completing the inner surface repair with residual strain remaining. Inner surface repair method.

13 3. Use a vehicle that has a gripper that grips both ends of the repair member and maintains the reduced diameter state, and uses a vehicle that is designed to run in a pipeline. Grasp both ends of the repairing member and move the vehicle to the required repair point in the pipeline while maintaining the reduced diameter.After reaching the required repairing point, release the repairing member from the gripping state by the gripper. 10. The method for repairing an inner surface of a pipeline according to claim 9, wherein spontaneous radial deformation of the repair member is caused.

1 4. It consists of at least two layers of cylinders, and its inner layer as a repair member is made of an elastic material. In the unconstrained state where its internal stress is minimized, it is larger than the inner diameter of the pipe to be repaired. An outer layer having an inner diameter smaller than an inner diameter of the conduit, the inner layer being held by the outer layer in a state where the diameter is prevented from being increased by a mechanical forcing force, and 10. The repair member according to claim 1, wherein a cross-sectional shape in a direction perpendicular to an axis of the pipeline is substantially similar to a contour shape of an inner periphery of the pipeline, after removing an outer layer. Inserting only the inner layer as a repair member into the pipeline, transporting and installing it to the required repair point in the pipeline, causing spontaneous expansion deformation in the direction where the internal stress becomes smaller, the inner surface of the pipeline The inner surface repair is completed with residual strain remaining The inner surface repair method of the conduit.

15. The method for repairing an inner surface according to claim 14, wherein the repair member is cooled before removing the outer layer.

1 6. The inner surface repair method according to claim 14 or 15, characterized in that the inner layer is cooled after the outer layer is removed until the transport is completed.

17. The method for repairing an inner surface according to any one of claims 12 or 4, wherein the inner layer is heated after being transported to a repair-required portion of the pipeline.