CN100453876C - FRP Sand Jacking Pipe - Google Patents

Abstract

The invention relates to a glass-steel sand-filled pipe jacking, which includes a pipe head, a pipe body and a pipe tail. The outer walls of the pipe head and the pipe tail are provided with concave platforms. The pipe head and the pipe tail are connected by a collar arranged on the concave platform. The head, pipe body and pipe tail use resin as the matrix, glass fiber as the reinforcing material layer, and quartz sand or calcium carbonate as the filler layer. The ends of the pipe head and pipe tail are provided with reinforcing components. The reinforcing part may be composed of an annular sleeve and an annular end cap integrally provided with it. The annular sleeve is sleeved on the pipe head and the pipe tail section, and the annular end cap is fastened on the ends of the pipe head and the pipe tail to cover the pipe head and the pipe tail. Section of the end of the pipe. In the preferred solution of the present invention, the pipe head and the pipe tail are further provided with reinforcing layers, which can be provided inside the pipe wall or on the outer surface of the pipe wall. Through the structural design of the reinforcement layer and the reinforcement parts, the invention greatly improves the ability of the FRP pipe jacking to withstand the jacking force and reduces the cost of the FRP pipe jacking to the greatest extent.

Description

FRP Sand Jacking Pipe

technical field

The invention relates to a glass-steel sand-filled pipe jacking, in particular to a glass-steel sand-filled pipe jacking with a reinforcing component and a reinforcing layer structure and excellent ability to bear jacking force.

Background technique

In the municipal pipeline laying project, there are generally two methods: one is open large excavation, that is, the ground is fully excavated, the pipes are nested and connected to each other, and then backfilled. The pipes are prefabricated, and do not bear pressure or jacking force when connecting and laying, and the construction is relatively simple and convenient; the other way is that when limited by the specific environment, such as buildings, it is not possible to use large excavation to lay pipes , can only pre-dig the work pit. When working in the work pit, push the pipe section by section at a certain depth underground. This kind of working environment requires the end of the pipe to be equipped with a pipe jacking part. Connections are made with collar seals.

As a new type of composite material pipe, FRP pipe jacking with sand has the characteristics of light weight, high strength, corrosion resistance and long life, and has been widely used in pipe jacking projects. FRP sand-filled pipe jacking in the prior art generally consists of a pipe head, a pipe body and a pipe tail, wherein the pipe head and pipe tail are connected by a collar during construction, and the pipe body adopts a fiber layer and quartz sand or calcium carbonate layer structure. The head and tail adopt fiber layer structure. In the above structure, the fiber layer and quartz sand or calcium carbonate layer structure of the pipe body are mainly used to provide the required hoop stiffness and reduce production costs, and the fiber layer structure used at the pipe head and pipe tail is mainly used to provide jacking. required axial strength.

Because the pipe head and the pipe tail are subjected to great force during jacking, the pipe head and the pipe tail of the prior art all adopt the fiber layer structure of the resin matrix. In order to achieve the required wall thickness of the pipe head and pipe tail, the number of layers of fiber cloth is more, resulting in an increase in cost.

In addition, the outer surface of the pipe head and pipe tail of the prior art FRP sand-filled pipe jacking is a fiber layer of resin matrix. Due to the traditional processing technology, the pipe diameter size and surface smoothness cannot be guaranteed. During construction, the pipe head, pipe tail and There is an unreasonable fit gap when the casing is connected, so that the relative displacement of the two pipe ends may occur during the jacking process of the FRP sand-filled pipe, causing the casing to tilt, resulting in a rapid increase in jacking resistance. The light ones cause the sealing effect to fail, and the severe ones cause the pipe head and pipe tail to tear, and the pipe jacking construction stops.

Contents of the invention

The purpose of the present invention is to provide a glass fiber reinforced plastic sand-filled pipe jacking against the defects of the prior art, which has the advantages of low cost, high strength, easy processing, etc., and can ensure a reasonable gap for pipe fitting.

In order to achieve the above purpose, the present invention provides a glass fiber reinforced plastic sand-filled pipe jacking, including a pipe head, a pipe body and a pipe tail. The collar connection on the above-mentioned concave platform, the pipe head, pipe body and pipe tail use resin as the matrix, glass fiber as the reinforcing material layer, quartz sand or calcium carbonate as the filler layer, the pipe head and pipe tail There is a reinforcing part at the top, the reinforcing part is an annular end cap, and the annular end cap is fastened on the end of the pipe head and the end of the pipe to cover the cross-section of the end of the pipe head and the end of the pipe; the pipe wall of the pipe head and the end of the pipe A reinforcement layer of metal or non-metal material is also provided.

In the above technical solution, the total thickness of the sand layer on the wall of the pipe head and pipe tail is smaller than the total thickness of the sand layer on the wall of the pipe body. The reinforcement layer can be a reinforcement strip or a reinforcement ring, which is arranged in the pipe wall. The reinforcing layer is a metal product, which can be arranged in the pipe wall of the pipe head and the pipe tail, and can also be arranged on the outer surface of the pipe head and the pipe tail.

In the above technical solution, the inner surface of the annular end cap may also be provided with a protruding part inserted into the pipe wall.

The present invention provides a new structure of FRP sand-filled pipe jacking. By arranging reinforcing parts at the pipe head and pipe tail, the ability of FRP sand-filled pipe jacking to withstand the jacking force is improved, and the reinforcing parts can well protect the pipe head and pipe tail. At the same time, the jacking pressure it bears is evenly transmitted. Due to the function of the reinforcing parts, the present invention can set a sand layer in the pipe wall of the pipe head and pipe tail under the premise of ensuring the overall rigidity and strength of the pipe body, thereby reducing the cost of the glass fiber reinforced plastic sand pipe jacking to the greatest extent.

The preferred solution of the present invention provides a glass fiber reinforced plastic sand-filled pipe jacking with a reinforcement layer. The reinforcement layer can be set in one or more layers according to the stress conditions of the construction jacking, and can only be arranged in the pipe wall of the pipe head and pipe tail. It can also be continuously installed in the pipe wall of the entire pipeline to form a cylinder structure, further improving the ability of FRP pipe jacking to withstand the jacking force. At the same time, the preferred solution of the present invention also provides a glass fiber reinforced plastic sand-filled pipe jacking with an external reinforcement layer. Since the outer surfaces of the pipe head and the pipe tail are made of metal, the outer diameter accuracy of the pipe head and the pipe tail can be accurately guaranteed. When the casing is connected and matched, there is a reasonable fit gap, and there will be no pipe end misalignment during the jacking process, which greatly reduces the jacking resistance.

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structure schematic diagram of glass fiber reinforced plastics sand inclusion pipe jacking of the present invention;

Fig. 2 is the structural representation of annular end cap of the present invention;

Fig. 3 is the structural representation of the annular end cap with protrusion of the present invention;

Fig. 4 is the structural representation of annular sleeve of the present invention;

Fig. 5 is another structural schematic diagram of the annular sleeve of the present invention;

Fig. 6 is a schematic structural view of the reinforcing ring of the present invention;

Fig. 7 is a structural schematic diagram of a reinforcing bar of the present invention;

Fig. 8 is a schematic structural view of the outer reinforcing ring of the present invention.

Explanation of reference signs:

1-tube body; 2-tube head; 3-tube tail;

4-concave platform; 5-enhanced parts; 51-ring end cover;

52-ring sleeve; 6-collar; 7-strengthening layer;

71-reinforcing ring; 72-reinforcing bar.

Detailed ways

Fig. 1 is a schematic diagram of the structure of the FRP sand-filled pipe jacking of the present invention, including a pipe body 1, a pipe head 2 and a pipe tail 3, all of which use resin as a matrix, glass fiber as a reinforcing material layer, and quartz sand or calcium carbonate as a filler The outer diameter of the pipe head 2 and the pipe tail 3 is smaller than the outer diameter of the pipe body 1, forming a concave platform 4 structure, and the ends of the pipe head 2 and the pipe tail 3 are also provided with reinforcing parts 5. During construction and jacking, the pipe heads 2 and pipe tails 3 of two adjacent jacking pipes are connected through the collar 6, and the reinforcing parts 5 are in direct contact.

The technical solution of the present invention is a composite structure in which the pipe head and the pipe tail are composed of a fiber layer and a sand layer to form the pipe wall, and the ends of the pipe head and the pipe tail are also provided with reinforcing components. The reinforcing part 5 of the present invention improves the ability of the FRP pipe to withstand the jacking force, plays a good role in protecting the pipe head and the pipe tail, and at the same time transmits the jacking pressure borne by it evenly. Due to the effect of the reinforcing part 5, the present invention can set sand layers in the pipe walls of the pipe head and pipe tail under the premise of ensuring the overall rigidity and strength of the pipe body, thereby reducing the cost of the FRP pipe jacking with sand inclusions to the greatest extent. Even when the single jacking length is long, the jacking forces on the left and right sides are different, or when operations such as deviation correction are performed, the FRP pipe jacking with sand inclusion of the present invention can also ensure good mechanical properties.

Under the design idea of the above-mentioned technical solution, the glass fiber reinforced plastic sand-filled pipe jacking of the present invention can have various structural forms, which will be described through specific examples below.

Embodiment one

Fig. 2 is a schematic structural view of the annular end cap of the present invention. In this embodiment as shown in FIG. 2 , the reinforcing component 5 is an annular end cap, which is fastened on the ends of the pipe head and the pipe tail to cover the cross-section of the ends. The research shows that the damage or even destruction of the pipe head and pipe tail during the construction of FRP sand-filled pipe jacking is largely due to the insufficient ability to withstand the jacking force. The technical solution of this embodiment adopts the reinforcing part 5 to effectively cover the pipe head and the pipe tail, and the ability to withstand the jacking force can be increased by 4 to 7 times, and the ability to withstand the jacking force of the FRP sand-filled pipe is improved. In this embodiment, the reinforcing component 5 can be a metal product, or a fiber product.

Embodiment two

Fig. 3 is a schematic structural view of the raised annular end cap of the present invention. On the basis of the technical solution of Embodiment 1, the ring-shaped end cap of this embodiment has protrusions, which are arranged on the side connected with the end faces of the pipe head and the pipe tail. At the same time, the end faces of the pipe head and the pipe tail are provided with grooves matching the protrusions, and the protrusions are closely matched with the grooves. In the embodiment shown in Fig. 3, the width of the protrusion is larger than the width of the sand layer at the pipe head and the pipe tail, and it is a metal product. In addition to the functions and effects of Embodiment 1, this technical solution further ensures the reliability and stability of the connection between the annular end cap 5 and the end faces of the pipe head and pipe tail, and at the same time ensures that the annular end cap transmits pressure to the fibers of the pipe head and pipe tail. layer. Of course, the annular end cap can also be grooved, and the end surfaces of the pipe head and pipe tail are convex structures.

Embodiment Three

Fig. 4 is a schematic structural diagram of the annular sleeve of the present invention. As shown in Figure 4, the reinforcing part 5 of this embodiment is composed of an annular sleeve 52 and an annular end cap 51 integrally provided with it, wherein the annular sleeve 52 is sleeved on the pipe head and the end section of the pipe, and the annular end cap 51 is snapped together At the head and tail ends, covers the sections of the head and tail ends. The reinforcing component 5 can be a metal product or a fiber product.

In this embodiment, the reinforcing part 5 mainly composed of the annular end cap 51 and the annular sleeve 52 exerts its reinforcing effect to the greatest extent. The annular end cap 51 covers the end faces of the pipe head and the pipe tail. During the jacking construction, the annular end cap 51 The ability to withstand the jacking force is 4 to 7 times that of the pipe head and pipe tail. The annular sleeve 52 integrated with the annular end cap 51 covers the outer surfaces of the pipe head and the pipe tail section, which can further exert the reinforcing effect of the annular end cap 51 .

Embodiment Four

Fig. 5 is another structural schematic diagram of the annular sleeve of the present invention. As shown in Figure 5, the annular sleeve 52 of this embodiment is sleeved on the connecting section between the pipe head, the pipe tail and the pipe body, the pipe head and the pipe tail, and the annular end cap 51 is fastened on the ends of the pipe head and the pipe tail. Covers the section at the end of the pipe head and pipe tail. The reinforcing component 5 can be a metal product or a fiber product. This embodiment can further improve the bearing capacity of the pipe head and the pipe tail.

Embodiment five

Fig. 6 is a structural schematic diagram of the reinforcing ring of the present invention. The pipe wall of the pipe head and the pipe tail in this embodiment is provided with a reinforcement layer 7, and the reinforcement layer 7 is a reinforcement ring 71, which is arranged coaxially along the pipe wall. The reinforcing component 5 is an annular end cap 51, and the surface of the annular end cap 51 is attached to the end surfaces of the pipe head and the pipe tail. In the technical solution of this embodiment, the annular end cap 51 may be a metal product or a fiber product, and its functions and effects are as described in the foregoing embodiments. The reinforcing rings can be arranged in one or more layers according to the stress conditions of construction jacking. In addition, the reinforcing rings 71 can be arranged only in the pipe wall of the pipe head and pipe tail, or can be arranged continuously in the pipe wall of the entire pipe. The reinforcing ring 71 forms a cylindrical structure in the pipe wall of the pipe head and the pipe tail, and is included in the fiber layer, which can improve the ability of the FRP sand-filled pipe to withstand the jacking force as a whole.

As shown in FIG. 6 , the second-layer reinforcing ring 71 of this embodiment is a metal product, and is respectively arranged on both sides of the sand-containing layer. The annular end cover 51 is also made of metal, and is fixedly connected with the reinforcing ring 71 . The reinforcing rings 71 are respectively arranged on both sides of the sand layer, and can transmit the jacking pressure borne by them evenly, so as to ensure that the pipe head or the pipe tail will not be damaged.

Embodiment six

Fig. 7 is a structural schematic diagram of the reinforcing bar of the present invention. In this embodiment, the pipe wall of the pipe head and the pipe tail is provided with a reinforcement layer 7, and the reinforcement layer 7 is a reinforcement strip 72, which is arranged at intervals along the pipe wall in the circumferential direction. The reinforcing bar 72 can be continuously arranged in the fiber layer of the pipe head, pipe body and pipe tail along the pipe axial direction, or can only be arranged in the fiber layer of the pipe head and pipe tail, so as to improve the jacking force of the FRP sand-filled pipe. Ability can be metal products or fiber products. It can be arranged only in the circumferential direction of the pipe wall, or can be arranged two-dimensionally in the circumferential direction and radial direction of the pipe wall.

As shown in Figure 7, the reinforcing bar 72 of this embodiment is a thin fiber sheet whose fiber direction is parallel to the axial direction of the FRP sand-filled pipe jacking, so it has axial reinforcement performance and greatly improves the pipe head and The ability of the pipe tail to withstand the jacking force.

Embodiment seven

Fig. 8 is a schematic structural view of the outer reinforcing ring of the present invention. As shown in Figure 8, the outer surface of the pipe wall of the pipe head and the pipe tail of the present embodiment is provided with a reinforcing ring 71, and the reinforcing part 5 is an annular end cap 51 structure, and the surface of the annular end cap 51 is in contact with the surface of the pipe head 2 and the pipe tail 3. End fit. In the technical solution of this embodiment, the annular end cap 51 may be a metal product or a fiber product, and its functions and effects are as described in the foregoing embodiments. In addition to being arranged on the outer surface of the pipe wall of the pipe head and pipe tail, the reinforcement ring 71 can also be provided with one or more layers in the fiber layer according to the stress situation of construction jacking. In addition, the reinforcing ring 71 can be provided only at the pipe head and pipe tail, or can be continuously provided on the entire pipe body.

In the technical solution of this embodiment, the structure of the reinforcing ring 71 is rationally designed according to the force characteristics of the increased resistance caused by the unreasonable matching gap between the pipe head and pipe tail and the casing during construction jacking. Since the outer surface of the pipe head and the pipe tail is the reinforcing ring 71, the outer diameter of the pipe head and the pipe tail can be accurately guaranteed. When it is connected with the collar 6, there is a reasonable fit clearance, and there will be no pipe gap during the jacking process. End stagger greatly reduces jacking resistance and is easy to process. Other functions and effects of the reinforcement ring 71 and the reinforcement component 5 are the same as those described above.

In the prior art, due to the stress of the pipe head and pipe tail during jacking during construction, the collar 6 is all metal products, which further increases the construction cost virtually. In this embodiment, since the outer surfaces of the pipe head and the pipe tail are reinforcing rings 71, the casing 6 can be metal or non-metal.

Apparently, the technical solutions of Embodiment 1 to Embodiment 7 can exist independently, or can be combined with each other to form new technical solutions, which will not be repeated here. The FRP sand-filled pipe jacking of the present invention reduces the cost on the basis of excellent mechanical properties through the structural design of the reinforcing layer and the reinforcing parts, is easy to process, and can ensure a reasonable clearance for the installation and fit of the joint parts of the pipes.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications to the specific implementation of the invention or equivalent replacement of some technical features; without departing from the spirit of the technical solution of the present invention, should be included in the scope of the technical solution claimed in the present invention.

Claims (7)

1. A glass fiber reinforced plastic sand-filled pipe, including a pipe head, a pipe body and a pipe tail. The outer wall of the pipe head and pipe tail is provided with a concave platform, and the pipe head and pipe tail pass through the collar arranged on the concave platform. The connection is characterized in that the pipe head, pipe body and pipe tail use resin as the matrix, glass fiber as the reinforcing material layer, and quartz sand or calcium carbonate as the filler layer, and the pipe head and pipe tail ends are equipped with Reinforcing component, the reinforcing component is an annular end cap, the annular end cap is fastened on the end of the pipe head and the pipe tail, covering the cross-section of the end of the pipe head and the pipe tail, and the pipe walls of the pipe head and the pipe tail are also provided with Reinforcing layer of metallic or non-metallic material. 2. The FRP pipe jacking with sand inclusion according to claim 1, characterized in that the total thickness of the sand inclusion layer on the pipe head and pipe tail wall is smaller than the total thickness of the sand inclusion layer on the pipe wall of the pipe body. 3. The glass fiber reinforced plastic sand-filled pipe jacking according to claim 1, characterized in that, the reinforcement layer is a reinforcement strip, which is arranged in the pipe wall. 4. The glass fiber reinforced plastic sand-filled pipe jacking according to claim 1, characterized in that, the reinforcement layer is a reinforcement ring, which is arranged in the pipe wall. 5. The FRP sand-filled pipe jacking according to claim 1, characterized in that the reinforcing layer is a metal product and is arranged in the pipe wall of the pipe head and pipe tail. 6. The glass fiber reinforced plastic sand-filled pipe jacking according to claim 1, characterized in that, the reinforcement layer is a metal product and is arranged on the outer surfaces of the pipe head and the pipe tail. 7. The glass fiber reinforced plastic sand-filled pipe jacking according to any one of claims 1-6, characterized in that, the inner side of the annular end cap is provided with a protruding part inserted into the pipe wall.

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