JP5588278B2 - Pipe dismantling device and wiring connection method - Google Patents

Description

  The present invention relates to a pipe disassembling apparatus for disassembling an existing pipe, and a wiring connection method for branching underground wiring from an existing pipe and connecting a branch line to a customer.

  In recent years, underground wiring has been popularized from the viewpoint of landscape and safety in cities. In underground wiring, pipes are buried in the ground, and power cables, communication cables, etc. are laid in the pipes. The normal underground wiring has a configuration in which a large number of pipes are bundled with protective concrete at predetermined intervals, and is connected to a working manhole at predetermined intervals. The pipe line plays a role of protecting the cable. Generally, a high-strength pipe such as a fume pipe using reinforced concrete or a reinforced plastic composite pipe is used.

  In the underground wiring as described above, when power is drawn into a new customer, a new pipeline is connected to an existing pipeline, or an old pipeline that has become unnecessary due to the new pipeline is installed. Removal work is performed. A part of the existing pipeline is dismantled along with this work. In the normal flow of dismantling the pipeline, the ground is first cut to the position of the pipeline. And after disassembling a part of the pipe (about 300-500mm in the longitudinal direction) and confirming the presence or absence of the cable in the pipe, the crushing position for dismantling the pipe in earnest is determined, and the dismantling work It is carried out. This dismantling work is performed manually by using a rock drill such as a vibration drill or a breaker, and tools such as a chisel and a hammer.

  As construction for underground wiring, for example, Patent Literature 1 discloses a method for removing a pipe line that enables the removal work of an existing buried pipe (pipe line) with a small excavation area. The removal method of Patent Document 1 has a structure in which a stand is formed on one end side of the removal section of the pipeline, and one end side and the other end side of the removal section are separated from the remaining section and pulled out from the stand by a jack. .

JP-A-8-28753

  Here, in the removal method of Patent Document 1, for example, the fume tube is separated using a cutting device or the like. Although a specific example of a cutting device is not clearly described in Patent Document 1, generally, a vibration tool such as a vibration drill and a tool such as a chisel and a hammer are used for cutting a fume tube. However, these vibration tools and the like require experience and skill for the workers to handle, so that differences in work efficiency appear depending on the skill level of the workers.

  Further, when a fume pipe made of concrete is separated using a vibration tool, noise, vibration, and dust are inevitably generated, and it is necessary to take countermeasures. In particular, since vibration induces vibration troubles to workers, the time for continuously handling a vibrating tool (one continuous work time for vibration work) is generally within 30 minutes, and a rest time of 5 minutes or more after one continuous work. (H21.7.10 nuclear power plant 0710 No. 2). Moreover, since dust causes health damage to workers, measures such as dust masks and air supply / exhaust facilities are required. Furthermore, noise and vibration are regulated by local regulations because they lead to pollution of the living environment. That is, the generation of noise, vibration and dust must be suppressed from both health and environmental aspects.

  Further, as described above, the underground wiring is provided with protective concrete that bundles the pipes, and it may be necessary to disassemble the protective concrete together with the pipes. Usually, the protective concrete is a large concrete block larger than the pipe, and the dismantling requires more noise, vibration and working time than the fume pipe.

  Furthermore, for example, when working on underground wiring laid with a power cable, if the power cable is damaged in a charged state (energized state), a short circuit accident will be caused. Stopped. In that case, prompt work is required to reduce the burden on the customer due to the power outage. However, if the pipes and protective concrete are disassembled using the above-described vibration tools such as the breaker and the vibration drill, the working time is limited. In addition, as described above, since the time for the operator to handle the vibration tool continuously is limited to a short time, a corresponding artificial garlic is also required, which causes an increase in construction costs.

  In view of such problems, the present invention suppresses the generation of noise, vibration, and dust associated with dismantling, and enables a pipe dismantling device that can quickly and efficiently dismantle the pipes with an easy operation. An object of the present invention is to provide a wiring connection method that can be reduced and can reduce health load and environmental load.

  In order to solve the above-described problems, a typical structure of a pipe disassembling apparatus according to the present invention is a pipe disassembling apparatus for disassembling an existing pipe, which is inserted into the pipe and is connected to the inner wall of the pipe. A hydraulic jack that extends toward the edge, a blade tip that presses the inner wall of the pipeline by the extension of the hydraulic jack, and a hydraulic jack that is installed on the opposite side of the hydraulic jack from the blade tip and that follows the inner wall of the pipeline. And a reaction force plate for dispersing the reaction force of the stretching force.

  According to the said structure, it is possible to crush a pipe line from an inner side with a static load, and to dismantle. Therefore, it is possible to significantly reduce the time required for dismantling as compared with the case of dismantling by striking or cutting with a vibration tool, and it is possible to significantly reduce the generation of noise and dust. Moreover, the physical burden given to the worker can be reduced. Still further, concrete is structurally vulnerable to tensile loads. Therefore, if it is the said structure, it is possible to dismantle a pipe line and protective concrete simultaneously by pressing protective concrete also from an inner side via a pipe line. Therefore, if it is the said structure, generation | occurrence | production of the noise and dust accompanying a disassembly will be suppressed, and a pipe line can be disassembled quickly and efficiently by easy operation which does not depend on a worker's skill.

  The pipe disassembling apparatus includes a column that is erected on the reaction force plate, a moving unit that is slidable along the column, and one end that is attached to the reaction force plate and is disposed outside the pipeline. A second hydraulic jack having a longer stroke than that of the hydraulic jack, and the moving portion is a first pressing plate to which the blade edge portion is attached and pushed by the hydraulic jack, and a second hydraulic jack that is pushed in the same direction as the hydraulic jack by the second hydraulic jack. Even after exceeding the stroke of the hydraulic jack, the moving part may move by the extension of the second hydraulic jack, and the blade edge part may press the inner wall of the pipeline.

  By providing the second hydraulic jack, the load applied to the inner wall of the pipe line can be increased. Here, it is preferable to insert the hydraulic jack into the pipe and press it directly, but since the pipe is narrow, a hydraulic jack with a large stroke cannot be inserted. Therefore, in the above configuration, initial breakage is first caused by the hydraulic jack in the pipeline, and then the blade edge portion is continuously moved by the second hydraulic jack having a large stroke outside the pipeline. Thereby, a pipe line and protective concrete can be demolished reliably.

  Said 2nd hydraulic jack is good in it being a double acting cylinder. This makes it possible to return the cutting edge portion to the initial position (state where the cutting edge portion is lowered) with hydraulic pressure after the load is applied. Therefore, it is possible to improve the performance and operability of the pipe disassembling apparatus.

  In order to solve the above problems, a representative configuration of the wiring connection method according to the present invention is a wiring connection method for branching underground wiring from an existing pipe line and connecting a branch line to a consumer, The area required for the branching of underground wiring in the pipeline is exposed as an area to be dismantled, and a manhole located on both sides of the pipeline in the extending direction is used to insert a linear body into the pipeline. The pipe dismantling apparatus according to claim 1 is fixed to the linear body, the linear body is drawn from the other manhole, the pipe dismantling apparatus is moved to one end of the dismantling target range, and the pipe disassembling apparatus The inner wall is pressed and disassembled, the pulling of the linear object and the dismantling of the conduit by the conduit dismantling device are repeated to the other end of the dismantling target range, and the underground wiring is arranged in the conduit, Branch from the dismantling target area that has been dismantled Characterized in that it continue.

  If it is the said structure, compared with the case where a vibration tool is used for the dismantling of a pipe line, working time can be reduced significantly. In addition, it is possible to significantly prevent noise, vibration, and dust generation, and to reduce the environmental load and the health load on workers. This also eliminates the possibility that the work time zone is restricted by noise and vibration. Furthermore, the dismantling work of the pipe line is performed by a pipe line dismantling apparatus that moves in the pipe line. Therefore, the excavation of the ground can be reduced because it is sufficient to remove the debris and connect the underground wiring.

  In order to solve the above problems, another typical configuration of the wiring connection method according to the present invention is a wiring connection method for branching underground wiring from an existing pipeline and connecting the branch line to a customer. 4. A pipe dismantling apparatus according to claim 2 or 3, wherein the ground is excavated to expose a range required for the branching of underground wiring in the pipe line as a dismantling target area, and a part of one end side of the dismantling target area is dismantled. The hydraulic jack is inserted, the inner wall of the pipeline is pressed by the hydraulic jack to the other end of the dismantling target area, the underground wiring is arranged in the pipe, and the underground wiring is dismantled from the dismantling target area The branch line is connected to the customer.

  In the above configuration, the vibration tool is used only when inserting the hydraulic jack of the pipe disassembling apparatus in disassembling the pipe. Therefore, it is possible to prevent the generation of noise, vibration, and dust by this wiring connection method, and reduce the environmental load and the health load on workers. In addition, since the pipeline is disassembled by a static load from the inside, a narrow work space is sufficient as compared with the case of dismantling by applying a hit or the like from the outside. Therefore, the excavation of the ground can be reduced also by the above configuration.

  According to the present invention, it is possible to suppress generation of noise, vibration, and dust associated with dismantling, a pipe dismantling apparatus that can quickly and efficiently dismantle the pipes with an easy operation, and a cutting range can be reduced. In addition, it is possible to provide a wiring connection method capable of reducing health load and environmental load.

It is a figure explaining the dismantling construction of a pipe line. It is a figure which shows the pipe line dismantling apparatus concerning 1st Embodiment. It is a flowchart explaining the wiring connection construction method concerning 1st Embodiment. It is a figure explaining operation | movement of a pipeline dismantling apparatus. It is a figure explaining operation | movement of a pipeline dismantling apparatus. It is a figure which shows the pipeline demolition apparatus concerning 2nd Embodiment. It is a figure which shows the modification of the pipeline dismantling apparatus concerning 2nd Embodiment. It is a flowchart explaining the wiring connection construction method concerning 2nd Embodiment. It is a figure explaining operation | movement of a pipeline dismantling apparatus. It is a figure explaining operation | movement of a pipeline dismantling apparatus. It is a figure which shows the result of having implemented the pipe line dismantling apparatus with respect to each dismantling object.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Pipe dismantling work)
Below, the dismantling construction of the pipe line used as the execution object of the pipe line dismantling apparatus concerning each embodiment is demonstrated first. FIG. 1 is a diagram for explaining the dismantling work of the pipeline 102. 1 (a) schematically shows the dismantling of the pipeline, FIG. 1 (b) is a cross-sectional view taken along the line AA in FIG. 1 (a), and FIG. -B shows a cross-sectional view.

  As shown in FIG. 1 (a), a conduit 102 covered with protective concrete 106 is buried between adjacent manholes 10 and 12 (in FIG. 1 (a), it is underground, (Indicated by solid lines, not dashed lines). As shown in FIG. 1B, the protective concrete 106 covers the four pipe lines including the pipe line 102.

  Here, consider the case where the branch line 16 indicated by the imaginary line is laid on the pipeline 102 with the construction of the new large building 14. At this time, first, the ground is excavated as indicated by the alternate long and short dash line (the excavation range E1) to expose the protective concrete 106, and then the pipe 102 and a part of the protective concrete 106 are brought into a state as shown in FIG. Dismantle (dismantling target range E2). Then, the branch line 16 is wired from the manhole 10 (or manhole 12) to the building 14 by branching from the disassembled portion of the pipe line 102.

[First Embodiment]
(Pipe dismantling device 100)
FIG. 2 is a diagram showing the pipe disassembling apparatus 100 according to the first embodiment. In FIG. 2, a range that cannot be visually recognized from the outside is indicated by a virtual line.

  A pipe disassembling apparatus 100 shown in FIG. 2 is an apparatus used for disassembling an existing pipe 102 (see FIG. 4A) embedded in the ground. Unlike the vibration tool which is a conventional dismantling apparatus, the pipe disassembling apparatus 100 disassembles the pipe line 102 by applying a static load. Below, it demonstrates supposing the case where the pipeline of diameter 130mm-about 150mm for underground power transmission is disassembled.

  As shown in FIG. 2, the pipe disassembling apparatus 100 according to the present embodiment includes a first hydraulic jack 120 and a first hydraulic jack 120 that extend in the same direction on both sides of the column 110, with columns 110 standing on the reaction force plate 134. Two hydraulic jacks 140 are provided. The first hydraulic jack 120 is fixed on the reaction force plate 134 by a fixing metal 136. The second hydraulic jack 140 and the column 110 penetrate the reaction force plate 134 and are bolted. However, these fixing methods are merely examples.

  The first hydraulic jack 120 is a small single-acting cylinder, and the second hydraulic jack 140 is a double-acting cylinder that is large and has a longer stroke than the first hydraulic jack 120. In this embodiment, the support | pillar 110 is a column shape and the moving part 126 is a cylindrical shape. Further, a cover 112 and a handle 114 are provided on the upper portion of the column 110. In FIG. 2, the cover 112 is shown through.

  The support column 110 is provided with a moving portion 126 slidable along the support column 110. A first pressing plate 128 to be pressed by the first hydraulic jack 120 is provided at the end (lower end) of the moving portion 126 on the reaction force plate 134 side, and a second pressing end is provided at the opposite end (upper end) of the moving portion 126. A second pressing plate 142 that is pressed by the hydraulic jack 140 in the same direction as the first hydraulic jack 120 is provided. The lower surface of the first pressing plate 128 is not connected to the first hydraulic jack 120 and is simply pressed, and the moving unit 126 can move beyond the stroke of the first hydraulic jack 120. The second pressing plate 142 is connected to the piston of the second hydraulic jack 140, and the moving unit 126 moves up and down as the piston of the second hydraulic jack 140 extends and contracts.

  A blade edge portion 130 that presses the inner wall 104 (see FIG. 4B) of the pipe line 102 is provided on the upper surface of the first pressing plate 128 (the side opposite to the first hydraulic jack 120). The edge 132 of the blade edge portion 130 is inclined so as to be lowered toward the end portion, and is configured so as to be easily inserted into the conduit 102 and to be easily crushed by pressing the conduit 102 from the end first. Yes.

  The reaction force plate 134 is installed on the opposite side of the blade edge portion 130 with respect to the first hydraulic jack 120. The bottom surface of the reaction force plate 134 is shaped along the inner wall of the conduit 102. In the present embodiment, a part of the cylindrical shape is formed along the curved surface of the inner wall of the cylindrical conduit 102. As a result, when the first hydraulic jack 120 and the second hydraulic jack 140 extend and the cutting edge 130 presses the inner wall 104 of the pipe line 102, the reaction force of the extension force is dispersed, and the pipe line on the reaction force plate 134 side. 102 can be prevented from being crushed and damaged. Therefore, for example, even if another pipeline exists in the vicinity of the pipeline 102 to be dismantled, it is not necessary to stop the transmission of the power line inserted through the other pipeline. Note that the shape of the reaction force plate 134 can be changed in accordance with the shape of the inner wall of the pipe line to be dismantled.

  An auxiliary reaction force plate 138 can be attached to the reaction force plate 134 so as to cope with a pipe having a large inner diameter. In the present embodiment, the auxiliary reaction force plate 138 has a shape that forms a part of a cylinder that covers the outer periphery of the reaction force plate 134. By appropriately changing the shape and thickness of the auxiliary reaction force plate 138, the pipe disassembling apparatus 100 can disassemble pipes having various shapes and inner diameters.

(Wiring connection method)
A wiring connection method to which the above-described pipe disassembling apparatus 100 is applied will be described. FIG. 3 is a flowchart for explaining the wiring connection method according to the first embodiment. 4 and 5 are diagrams for explaining the operation of the pipe disassembling apparatus 100. FIG. FIG. 5 shows the operation of the pipe dismantling apparatus 100 continued from FIG. Hereinafter, the wire connection method will be described in accordance with the flowchart of FIG. 3 and with reference to FIGS.

  The wiring connection method shown as a flowchart in FIG. 3 uses the pipe dismantling apparatus 100 to branch the underground wiring from the existing pipe 102 shown in FIG. 1 and connect the branch line 16 to the customer (building 14). It is a construction method. For this purpose, first, in step 180 of FIG. 3, the ground is excavated to expose a range required for branching of the underground wiring in the pipeline as a dismantling target range E2 (see FIG. 1).

  Next, a part of one end side of the dismantling target range E2 is disassembled (step 182), and the first hydraulic jack 120 of the pipe disassembling apparatus 100 is inserted therein (step 184).

  FIG. 4A is a diagram for explaining before the operation of the pipe disassembling apparatus 100. In step 182 (see FIG. 3), as shown in FIG. 4A, a part of the pipe line 102 is disassembled using a breaker or the like so that the vicinity of the first hydraulic jack 120 of the pipe line dismantling apparatus 100 can be inserted. . In the subsequent step 184, the first hydraulic jack 120 is inserted into the conduit 102 together with the cutting edge portion 130 and the reaction force plate 134. At this time, the column 110 and the second hydraulic jack 140 are outside the pipe line 102.

  Next, the dismantling of the conduit 102 by the conduit disassembling apparatus 100 in step 186 in FIG. 3 will be described. As shown in FIG. 4B, when high-pressure hydraulic oil is supplied from the hydraulic hose 122a to the first hydraulic jack 120 and the second hydraulic jack 140, the two hydraulic jacks 120 and 140 expand at the same time to move the moving part 126. Move. Therefore, the load applied from the blade edge part 130 to the inner wall 104 of the pipe line 102 is a load obtained by combining the extension forces of the first hydraulic jack 120 and the second hydraulic jack 140. When the blade edge portion 130 presses the inner wall of the pipe line 102 and applies a static load, the concrete is a brittle material and is strong against compressive stress but weak against tensile stress. Cracks occur, causing some damage.

  Fig.5 (a) has shown the operation | movement of the pipeline dismantling apparatus 100 continued from FIG.4 (b). As shown in FIG. 5 (a), hydraulic oil is further supplied from the hydraulic hose 122a from the state of FIG. 4 (b). As shown in FIG. 5A, the stroke length S2 when the second hydraulic jack 140 extends is longer than the stroke length S1 of the first hydraulic jack 120. Therefore, the first hydraulic jack 120 stops extending at the stroke limit, but the second hydraulic jack 140 further expands. Accordingly, even after the moving part 126 exceeds the stroke length S1 of the first hydraulic jack 120, the first pressing plate 128 moves away from the first hydraulic jack 120 and moves by the extension of the second hydraulic jack 140. That is, the blade edge portion 130 continues to press the inner wall 104 of the pipe line 102 even when the stroke length S1 is exceeded.

  Here, the hydraulic jack is preferably inserted into the pipe 102 and pressed directly (pressed on the axis of the piston of the hydraulic jack). However, since the pipe 102 is narrow, a hydraulic jack having a large stroke should be inserted. I can't. Therefore, in the present embodiment, as shown in FIG. 4B, the initial hydraulic jack 120 in the pipeline 102 mainly causes an initial failure, and from there, the pipeline 102 as shown in FIG. 5A. The outer second hydraulic jack 140 is completely peeled off. In particular, in the present embodiment, by providing the second hydraulic jack 140 in addition to the first hydraulic jack 120, it is possible to increase the load applied to the inner wall 104 of the pipe line 102 and to cause initial breakage more suitably. it can. As a result, it is possible to quickly and silently dismantle the protective concrete 106 that bundles the conduit 102 and the plurality of conduits (step 186 in FIG. 3). It should be noted that the level of “quiet” is the sound of a concrete block that is large enough to hold in a hand and dropped onto the concrete from a height of about 10 cm.

  In the present embodiment, the second hydraulic jack 140 is a double-action cylinder. As shown in FIG. 5B, the supply of hydraulic oil from the hydraulic hose 122a is stopped, and hydraulic oil is supplied from the hydraulic hose 122b instead. Thereby, the 2nd hydraulic jack 140 and the moving part 126 can be lowered | hung at arbitrary low speeds, and it can return to an initial position (state which the blade edge | tip part 130 was lowered | hung) safely. As described above, since the second hydraulic jack 140 is a double-acting cylinder, the performance and operability of the pipe disassembling apparatus 100 can be improved.

  Refer to FIG. 3 again. After step 186, when the dismantling target range E2 (see FIG. 1) has not been disassembled (No in step 188), step 184 and step 186 are repeated to dismantle the remaining dismantling target range E2. When dismantling up to the other end of the dismantling target range E2 (Yes in Step 188), underground wiring is disposed in the pipeline via the manholes 10 and 12 (Step 190), and the dismantling object dismantling the underground wiring The branch line 16 is branched from the range E2 and connected to the customer (building 14) (step 192). Thereby, the drawing of electric power to a new consumer is completed.

  As described above, according to the pipe disassembling apparatus 100 according to the present embodiment, the pipe 102 and the protective concrete 106 can be crushed from the inside by a static load and disassembled. Therefore, it is possible to significantly reduce the time required for dismantling as compared with the case of dismantling by striking or cutting with a vibration tool, and it is possible to significantly reduce the generation of noise and dust. Further, unlike the vibration tool, since the impact and vibration given to the worker during operation of the apparatus are small, the physical burden given to the worker can be reduced. Therefore, the pipe 102 can be quickly and efficiently disassembled by an easy operation that does not depend on the skill of the worker.

  Further, in the above-described wiring connection method using the pipe disassembling apparatus 100, the vibration tool is only used when the first hydraulic jack 120 of the pipe disassembling apparatus 100 is inserted when the pipe 102 is disassembled. Therefore, it is possible to prevent the generation of noise, vibration, and dust, and reduce the environmental load and the health load on workers. As a result, there is no possibility that the work time zone is restricted by noise and vibration. Furthermore, since the duct 102 is disassembled by a static load from the inside, a narrow working space is sufficient as compared with the case of dismantling by hitting or the like from the outside. Therefore, the ground excavation range E1 can be reduced as compared with the conventional pipe connection method.

  Note that the pipe disassembling apparatus 100 can be applied not only to underground pipes for power cables but also to dismantling of fume pipes used for sewage and the like. Furthermore, the pipe disassembling apparatus 100 can be used not only for disassembling a tubular body but also for repairing / repairing a tubular body that has collapsed. At that time, for example, the pipe disassembling apparatus 100 can be used in a horizontal direction so that a load can be applied in the horizontal direction. For this reason, for repair and repair work on a tubular body extending in the vertical direction, such as the manhole 10 in FIG. Can also be used.

[Second Embodiment]
(Pipe dismantling device 200)
A second embodiment of the pipe disassembling apparatus according to the present invention will be described. FIG. 6 is a diagram illustrating a pipe disassembling apparatus 200 according to the second embodiment. In addition, about the part which overlaps with 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The pipe disassembling apparatus 200 shown in FIG. 6 is different from the first embodiment in that a static load is applied to the pipe 102 (see FIG. 4A) using only one hydraulic jack 160. As shown in FIG. 6, in the pipe disassembling apparatus 200, the cutting edge 202 is covered with a hydraulic jack 160 installed on the reaction force plate 134 and used for disassembling the pipe 102.

  The blade edge portion 202 has a cylindrical cover shape, and is used by being covered with a hydraulic jack 160 having a cylindrical shape. The blade edge portion 202 is made of metal and has a sharp edge 202a at the top. In the pipe line 102, the blade edge part 202 is pushed upward by the extension of the hydraulic jack 160 and presses the inner wall 104 of the pipe line 102.

  The pipe disassembling apparatus 200 is provided with a U-shaped handle 204. The handle disassembly device 200 can be easily transported by the handle 204.

  As described above, even with the pipe disassembling apparatus 200 having a simpler configuration as compared with the first embodiment, the pipe 102 can be crushed from the inside by a static load and disassembled. The generation of noise and dust associated with the dismantling can be suppressed, and the pipe 102 can be quickly and efficiently disassembled with an easy operation that does not depend on the skill of the worker.

  Furthermore, the pipe disassembling apparatus 200 can be applied to a wiring connection method different from that shown in FIG. 3 by modifying a part thereof. Below, after explaining the pipe dismantling apparatus 220 which is a modification of the pipe dismantling apparatus 200, the pipe connection construction method to which the pipe dismantling apparatus 220 is applied will be explained.

(Modification of the pipe disassembling apparatus 200)
FIG. 7 is a diagram illustrating a modification of the pipeline disassembling apparatus 200 according to the second embodiment. The pipe disassembling apparatus 220 shown in FIG. 7 is different from the pipe disassembling apparatus 200 in that it includes linear bodies (wires 222a and 222b) extending in the front-rear direction.

  The wires 222a and 222b are respectively attached to both sides in the front-rear direction (both sides in the left-right direction in the drawing) of the pipe disassembling apparatus 220. These wires 222a and 222b are for pulling the dismantling apparatus 220 at a distant position. A scale 224 indicating the distance is marked on the wires 222a and 222b, and an operator can grasp the distance to the pipe dismantling device 220 by using the scale at hand. Hooks 226a and 226b are provided at the ends of the wires 222a and 222b, and can be connected to U-shaped connecting portions 228a and 228b provided on both sides in the front-rear direction of the pipe disassembling apparatus 220, respectively. Note that the hooks 226a and 226b and the connecting portions 228a and 228b are an example of a configuration for connecting the wires 222a and 222b to the conduit disassembling apparatus 220, and are not limited thereto.

  The configuration of the hydraulic jack 160 and the blade edge portion 202 of the pipeline breaking device 220 may be the same as that of the pipeline breaking device 220, but a spring is preferably used to return to the initial position (a state where the blade edge portion 130 is lowered). 230a and 230b may be provided. The springs 230a and 230b are set between the locking bolts 232a and 232b of the blade edge portion 202 and the locking hoops 234a and 234b of the reaction force plate 134, and pull the blade edge portion 202 pushed up by the hydraulic jack 160 back to the initial position. Can do.

  The springs 230a and 230b are an example of a configuration for biasing the returning operation of the blade edge portion 202 to the initial position, and can be replaced with other configurations. For example, if the piston of the hydraulic jack 160 and the blade edge portion 202 can be connected to each other, the blade edge portion 202 can be suitably returned to the initial position. In that case, if the hydraulic jack 160 is a double-acting cylinder, the cutting edge portion 202 can return to the initial position more safely. Although only the hydraulic hose 122a is illustrated in FIG. 7, another hydraulic hose may be provided on the opposite side of the hydraulic jack 160 (the opposite side of the hydraulic hose 122a). As a result, hydraulic oil can be supplied from either side of the manholes 10 and 12 (see FIG. 9).

(Wiring connection method)
A wiring connection method to which the above-described pipe disassembling apparatus 220 is applied will be described. FIG. 8 is a flowchart for explaining the wiring connection method according to the second embodiment. 9 and 10 are diagrams for explaining the operation of the pipe disassembling apparatus 220. FIG. FIG. 10 shows the operation of the pipe dismantling apparatus 220 continued from FIG. Hereinafter, the wiring connection method will be described with reference to the flowchart of FIG. 8 and with reference to FIG. 1, FIG. 9, and FIG.

  The wiring connection method shown in the flowchart of FIG. 8 is similar to the wiring connection method shown in FIG. 3, and the underground wiring is branched from the existing pipe line 102 shown in FIG. 1 to the customer (building 14). Is a method of connecting Therefore, in the flowchart of FIG. 8, the same processes as those in the flowchart of FIG.

  After exposing the dismantling target range E2 in step 180 of FIG. 8, a linear body (wire) is applied to the conduit 102 using the manholes 10 and 12 located on both sides in the extending direction of the conduit 102 (see FIG. 1). Insert (step 250). Specifically, among the wires 222 a and 222 b shown in FIG. 8, the wire 222 b is first inserted from the manhole 10 (see FIG. 1) toward the manhole 12.

  Next, in step 252, in one manhole (manhole 12 in FIG. 1), the pipe disassembling apparatus 220 is fixed to the wire 222 b (linear body) inserted through the pipe 102. Further, the wire 222a is connected to the pipeline disassembling apparatus 220. Then, as shown in FIG. 9 (a), the wire 222b is drawn from the other manhole (manhole 10), and the conduit dismantling device 220 is moved to one end of the dismantling target range E2 (step 254).

  Since the scales 224 are marked on the wires 222a and 222b shown in FIG. 9A, the worker refers to the scales 224 of the wires 222a and 222b at hand and disassembles the pipes invisible in the pipelines. The position of the device 220 can be grasped. Therefore, if the distance from the manhole 10 or the manhole 12 to the dismantling target range E2 is known, the movement of the conduit dismantling device 220 to one end of the dismantling target range E2 (step 254) is easy.

  In step 186, the pipeline 102 is disassembled by the pipeline disassembly device 220. As shown in FIG. 9B, when high pressure hydraulic oil is supplied from the hydraulic hose 122 a to the hydraulic jack 160, the blade edge portion 202 presses the inner wall 104 of the pipe line 102. Then, the inner wall 104 and the protective concrete 106 are gently cracked, and a slight breakage occurs.

  Fig.10 (a) has shown the operation | movement of the pipeline dismantling apparatus 220 following FIG.9 (b). As shown in FIG. 10 (a), when hydraulic oil is further supplied from the hydraulic hose 122a from the state of FIG. 9 (b), the cracked portions of the pipe line 102 and the protective concrete 106 are completely peeled off. As described above, the pipeline 102 and the protective concrete 106 can be quickly and silently disassembled by the pipeline disassembling apparatus 220 (step 186). At this time, by providing the springs 230a and 230b, the blade edge portion 202 can be suitably returned to the initial position.

  After step 186, when the dismantling target range E2 has not yet been disassembled (No in step 188), the wire disassembly device 220 is moved by pulling the wire 222a as shown in FIG. Step 254), the pipe line 102 is disassembled (step 186), and these are repeated to dismantle the remaining dismantling target range E2. When the dismantling target range E2 has already been disassembled (Yes in Step 188), underground wiring is disposed (Step 190), and the branch line 16 (see FIG. 1) is connected to the consumer (building 14). (Step 192). Thereby, the drawing of electric power to a new consumer is completed.

  If it is the said structure, it is not necessary to use a vibration tool, and all the demolition work of the pipe line 102 can be performed by the pipe line dismantling apparatus 220 which moves the inside of a pipe line. Therefore, the ground excavation range E1 shown in FIG. 1 only needs to be a minimum range that can remove the debris that has been demolished and connect the underground wiring. That is, with the pipe connection method according to the present embodiment, the ground excavation range E1 can be further reduced.

  In addition, according to the present embodiment, the working time can be significantly reduced as compared with the case where the vibration tool is used for disassembling the pipe line 102. In addition, noise, vibration, and dust generation can be significantly prevented, and not only the environmental load but also the health load on workers can be reduced. Moreover, there is no possibility that the work time zone is restricted by noise and vibration.

  As described above, the pipe disassembling apparatus 200 dismantles the pipe by moving it from each manhole to a desired position on the pipe, according to the tension of the linear body inserted between the manholes. Therefore, when applying the pipe dismantling apparatus 200, as in the case of applying the pipe dismantling apparatus 100, in order to dispose the pipe dismantling apparatus 100 inside the pipe, the ground in the dismantling target range is excavated. It is not necessary to dismantle a part of the pipeline in advance. When the pipe disassembling apparatus 200 is applied, if only the soil above the target position for dismantling is removed, disassembly of only the pipe at the target position is possible. Therefore, in forming a branch line in a confined area such as a residential area, inconvenience to residents can be minimized, and the work amount and work time can be shortened.

(Verification of dismantling performance)
Below, the dismantling performance with respect to a pipe line and protective concrete was verified using the pipe line demolition apparatus 100 concerning 1st Embodiment on behalf of the said embodiment. FIG. 11 is a diagram showing a result of carrying out the pipe dismantling apparatus 100 for each dismantling object.

  As shown in FIG. 11, in Example 1, a fume pipe made of reinforced concrete having an inner diameter of 150 mm was used for dismantling. In Example 2, a fume tube having an inner diameter of 130 mm was used as a disassembly target. In Example 3, a reinforced plastic composite pipe (PFP) reinforced with glass fiber having an inner diameter of 150 mm was used as a disassembly target. In Example 4, a fume tube having an inner diameter of 150 mm provided with protective concrete was to be disassembled. In Example 5, a 130 mm inner diameter fume pipe provided with protective concrete was to be disassembled. In Example 6, a PFP having an inner diameter of 130 mm provided with protective concrete was used as an object to be dismantled.

  In Example 1 and Example 2, the rebar was broken and the fume tube could be crushed. In Example 3, PFP, which has higher deformation performance than the fume tube, is targeted for dismantling, but the reinforcing glass fiber could be broken and crushed.

  Moreover, in Example 4 and Example 5, the load was applied also to the protective concrete through the fume pipe, respectively, and both the fume pipe and the protective concrete could be crushed. In Example 5, the pipe dismantling apparatus 100 was implemented on the fume pipe to be disassembled in a state where other fume pipes were connected to the same protective concrete, and the influence on the other fume pipes was verified. However, as described in the first embodiment, the pipe disassembling apparatus 100 crushes only the contact portion of the blade edge portion 130 accurately. For this reason, in Example 5, it was confirmed that application of a load from the blade edge portion 130 in a direction in which no other fume pipe exists does not affect the other fume pipe. At that time, no crack or the like occurred at the contact portion of the reaction force plate 134.

  In Example 6, it was possible to apply a load to the protective concrete via the PFP pipe and crush the protective concrete. Although it was possible to cause a partial crack in PFP, the crack did not grow until crushing. However, since the protective concrete can be crushed, the PFP can be sufficiently crushed by removing the protective concrete and implementing the pipe disassembling apparatus 100 on the PFP again.

  In Example 6, the pipe dismantling apparatus 100 was implemented to the target PFP in a state where other PFPs were also connected to the same protective concrete. However, as in Example 5, it was confirmed that application of the load from the blade edge portion 130 in the direction in which no other PFP exists did not affect the other PFP.

  From these facts, it was confirmed that according to the pipe disassembling apparatus 100 according to the first embodiment, the pipe and the protective concrete can be efficiently disassembled. In addition, it was confirmed that even if other pipes exist in the vicinity, only the pipe to be demolished can be demolished without affecting the pipe. Furthermore, the conventional pipe dismantling apparatus required about 20 minutes to disassemble the pipe, but the pipe disassembling apparatus 100 could be disassembled in about 10 minutes. Therefore, according to the pipe disassembling apparatus 100, it is possible to shorten the construction period and perform precise dismantling work.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a pipe disassembling apparatus for disassembling an existing pipe and a wiring connection method for branching underground wiring from an existing pipe and connecting a branch line to a customer.

E1 ... Opening range, E2 ... Demolition target range, S1, S2 ... Stroke length 10, 12 ... Manhole, 14 ... Building, 16 ... Branch line, 100 ... Pipe line demolition device, 102 ... Pipe line, 104 ... Inner wall, 106 ... Protective concrete, 110 ... Column, 112 ... Cover, 114 ... Handle, 120 ... First hydraulic jack, 122a ... Hydraulic hose, 122b ... Hydraulic hose, 126 ... Moving part, 128 ... First pressing plate, 130 ... Cutting edge part , 132 ... Edge 134 ... Reaction force plate, 136 ... Fixing bracket, 138 ... Auxiliary reaction force plate, 140 ... Second hydraulic jack, 142 ... Second pressing plate, 160 ... Hydraulic jack, 200 ... Pipe dismantling device, 202 ... Cutting edge portion, 204... Handle, 220... Pipe dismantling device, 222 a and 222 b... Wire, 224. , 226b ... hook, 228a, 228b ... the connecting portion, 230a, 230b ... spring, 232a, 232b ... locking bolt, 234a, 234b ... locking hoop

Claims (3)

A pipe dismantling device that dismantles existing pipes,
A hydraulic jack inserted into the pipe and extending toward the inner wall of the pipe;
A cutting edge portion that presses the inner wall of the pipe line by extension of the hydraulic jack;
A reaction force plate that is installed on the opposite side of the blade edge portion with respect to the hydraulic jack, and disperses the reaction force of the extension force of the hydraulic jack in a shape along the inner wall of the pipe line;
A column erected on the reaction plate;
A moving part slidable along the column;
A second hydraulic jack having one end attached to the reaction force plate, disposed outside the pipe line, and having a longer stroke than the hydraulic jack;
The moving unit includes a first pressing plate to which the blade edge portion is attached and pressed by the hydraulic jack, and a second pressing plate that is pressed by the second hydraulic jack in the same direction as the hydraulic jack,
Even after the stroke of the hydraulic jack is exceeded, the moving part moves due to the extension of the second hydraulic jack, and the cutting edge part presses the inner wall of the pipe line. The pipe disassembling apparatus according to claim 1 , wherein the second hydraulic jack is a double-acting cylinder. A wiring connection method for branching underground wiring from existing pipes and connecting branch lines to customers,
Excavating the ground to expose the range required for the branching of the underground wiring in the pipeline as a dismantling target range,
A part of one end side of the dismantling target range is disassembled, and the hydraulic jack of the pipeline disassembling apparatus according to claim 1 or 2 , is inserted,
Depressing the inner wall of the pipe line by the hydraulic jack to the other end of the dismantling target range,
A wiring connection method characterized in that underground wiring is disposed in the pipe line, the underground wiring is branched from the dismantling target range, and a branch line is connected to a consumer.

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