JP6241593B2 - First aid repair method - Google Patents

Description

  The present invention relates to an emergency repair method for a sag, and can be suitably used for, for example, a sag embedded in a roadbed supporting a railroad track.

  In the roadbed supporting the railway track, a water pipe is embedded to cross the agricultural water and the like. This water pipe is called "sag".

  The prone is a crossing pipe that was laid mainly for running agricultural water at the time of railway construction, and many of them are old, and about half of the prone has passed nearly 100 years. In addition, ceramic pipes, reinforced concrete pipes, fume pipes, etc. are used as prone, but ceramic pipes are more commonly used in older installations, and the prone that has passed nearly 100 years since installation. Most of them are ceramic tubes.

  And many of the protuberances made of porcelain pipes that have been in service for a long time have deformed such as cracks. If there is a crack, earth and sand will flow into the burrow from there, and there is a possibility that a cavity will be generated in the roadbed. If the cavity becomes large, the roadbed will collapse, and in the worst case, it will lead to a serious accident.

  As a countermeasure against this, there is a method in which a lining member that is cured by heating is disposed on the inner peripheral surface of the sag, and is cured by applying predetermined heat to form a lining layer on the inner peripheral surface of the sag. (For example, refer to Patent Document 1).

JP 2010-131916 A

  As described above, the prone deformation such as cracks may cause a serious accident. Therefore, it is necessary to repair the prone immediately when such proneness is found. For this reason, it is required to further improve the speed in the repair work of the prone.

  In addition, the number of burial buried in the roadbed of the railway track is large, and repairs cannot be completed at once, and repairs are progressing sequentially every year.

  For this reason, the appearance of an inexpensive repair method that can be an emergency measure until full-scale repairs are made is awaited.

  The present invention has been made in view of such a situation, and it is an object of the present invention to provide an emergency repair method for a sag that can be constructed at a lower cost and at a lower cost than the existing sag repair method. .

  This invention solves the said subject with the following emergency repair method of the proneness.

That is, according to the present invention, the prone emergency repair method includes a step of installing a water pipe having an outer diameter smaller than the inner diameter of the prone in the prone and a tube into which the foamable material is injected. And a step of injecting a foamable material into the tube installed in the sag, the tube being located between the inner surface of the sag and the outer surface of the water conduit. The foamable material injected into the tube is filled between the inner surface of the sag and the outer surface of the water pipe, and the filled foamed material is cured to support the slab inner surface. And a method for emergency repair of the sag, which prevents the collapse of the sag.

  In the emergency repair method for the sag, the foamable material destruction step of destroying the foamable material filled between the inner surface of the sag and the outer surface of the water pipe with high-pressure water, and the destroyed foamable material And a step of removing from the sag.

  In the foamable material breaking step, the sag is formed by a first high-pressure water discharge nozzle that jets high-pressure water forward onto the foamable material filled between the inner surface of the sag and the outer surface of the water pipe. A second high-pressure water discharge nozzle for injecting high-pressure water laterally is inserted into the hole, and the second high-pressure water discharge nozzle is inserted in the longitudinal direction of the sag. The foamable material filled between the inner surface of the sag and the outer surface of the water pipe may be destroyed.

  Here, “injecting high-pressure water forward” is to inject high-pressure water as a main direction in the longitudinal direction of the sag and toward the foamable material, in the main direction. In addition, the concept includes injecting high-pressure water in a direction other than the main direction.

  Further, “injecting the high-pressure water to the side” means to inject high-pressure water in a direction having a component perpendicular to the longitudinal direction of the sag, for example, obliquely rearward with respect to the nozzle traveling direction. It is a concept that includes injecting high-pressure water.

  The pressure of the high-pressure water is preferably 12-18 MPa.

  The tube preferably does not prevent the foamable material injected into the tube from expanding in the direction of the inner surface of the sag.

  The tube is made of polyethylene and has a cylindrical shape, for example.

  The foamable material is, for example, foamed hard urethane.

  The water pipe is preferably bendable.

  According to the present invention, the emergency repair method for a sag is shorter than the current method for repairing a sag and can be constructed at a low cost.

Sectional view of the roadbed supporting the railroad track cut along a plane perpendicular to the railroad track Cross section of the bottom 10 and its inside when cut along the line II-II in FIG. 1 (plane orthogonal to the longitudinal direction of the base 10) Sectional view schematically showing the state in which the first half step α is being carried out (the state in which the foamed rigid urethane 14 is filled inside the bottom 10) including the materials used for the construction (the bottom 10 is the bottom 10) Cross section cut along a vertical plane parallel to the longitudinal direction) 3 is a cross-sectional view of the bottom 10 when cut along the line IV-IV in FIG. 3 (a plane perpendicular to the longitudinal direction of the bottom 10). Schematic diagram of spray gun 20 used in first half process α In the latter half process β, it is a schematic diagram showing a procedure for destroying the foamed rigid urethane 14 filled in the bottom 10 with high-pressure water in two stages, (A) is a diagram showing a state in which the first half process α is completed, (B) is a view showing a situation where a hole 14A having a relatively small diameter is opened in the foamed hard urethane 14, and (C) shows a situation where the foamed hard urethane 14 is broken so as to expand the diameter of the hole 14A. FIG. The figure which shows typically the front destruction nozzle 30 used for the destruction of the 1st step by high pressure water Schematic view of the front breaking nozzle 30 as seen from the direction of arrow VIII in FIG. The figure which shows typically the side destruction rotation nozzle 32 used for destruction of the 2nd step by high pressure water A photograph of the situation immediately after the start of filling of rigid urethane foam into the gap between the inner surface of a 250 mm diameter void tube and the outer surface of a 100 mm diameter PVC tube A photograph of the situation where foamed rigid urethane is being filled into the gap between the inner surface of a 250 mm diameter void tube and the outer surface of a 100 mm diameter PVC tube A photograph of the situation when the filling of rigid urethane foam into the gap between the inner surface of a 250 mm diameter void tube and the outer surface of a 100 mm diameter PVC tube is completed Photograph of a PVC pipe with a tube diameter of 100 mm taken out by cutting the void pipe after hardening the filled rigid urethane Photo of the completed arrangement of materials for filling with foamed rigid urethane A photo of materials pulled out from the simulated prone area Photograph of a cross-section of the hard foam after curing in the inner tube A photograph of the appearance of the hard foam after curing taken out from the inner tube The figure which shows typically the external appearance of the simulation prone 40 The figure which shows typically the external appearance of the simulation prone 42

  Hereinafter, with reference to the drawings, an emergency repair method for proneness according to an embodiment of the present invention will be described in detail.

  FIG. 1 is a cross-sectional view of a roadbed supporting a railroad track cut in a direction orthogonal to the railroad track. The bottom 10 is embedded in the roadbed 50 in a direction orthogonal to the railroad track 52. It is assumed that a deformed portion 10A such as a crack is generated in the vicinity of the center portion of the prone 10 and a case where the deformed portion 10A is repaired by the emergency repair method according to the embodiment of the present invention will be described. .

  The emergency repair method for proneness according to the present embodiment has several processes, and these processes are roughly divided into a first half process α and a second half process β.

  The first half step α is a step of inserting a water pipe and a filling tube into the bottom, injecting foamed hard urethane into the filling tube, and filling the foamed hard urethane between the inner surface of the bottom and the outer surface of the water pipe. In the latter half process β, the filled foamed urethane is destroyed using high-pressure water, and the material installed in the first half process α is removed.

(First half process α)
In the first half step α, the water pipe 12 is installed in the prone 10 having undergone deformation such as cracks, and the foamed rigid urethane 14 is filled in the gap between the inner surface of the prone 10 and the outer surface of the water pipe 12, The object is to prevent the progress of deformation of the slab 10, the collapse of the slab 10, and the outflow of earth and sand on the back of the slab 10. By carrying out the first half step α, a serious accident can be avoided urgently, and safety can be ensured until full-scale repairs are made.

  FIG. 2 is a cross-sectional view of the bottom 10 and its inside when cut along the line II-II in FIG. 1 (a plane perpendicular to the longitudinal direction of the base 10), and the bottom after the first half step α is performed. It is sectional drawing which shows 10 states typically only with main structures.

  As shown in FIG. 2, a water pipe 12 is installed on the inside of the bottom 10 after the first half step α is performed, and a foaming hard is provided in the gap between the inner surface of the bottom 10 and the outer surface of the water pipe 12. Urethane 14 is filled.

  The passage of water is secured by the water flow pipe 12, and water can flow through the slab 10 even after the sag emergency repair method according to this embodiment is performed. Further, the gap between the inner surface of the bottom 10 and the outer surface of the water pipe 12 is filled with foamed hard urethane 14, and this filled foamed hard urethane 14 supports the inner surface of the bottom 10 and supports the bottom 10. The generated crack is closed, and the progress of the deformation of the prone 10, the collapse of the prone 10 and the outflow of earth and sand on the back of the prone 10 are prevented.

  The first half step α will be described in more detail.

  FIG. 3 is a cross-sectional view schematically showing the state in which the first half step α is being performed (the state in which the foamed rigid urethane 14 is filled inside the bottom 10) including materials used for construction. FIG. 4 is a cross-sectional view taken along a vertical plane parallel to the longitudinal direction of the prone 10, and FIG. 4 is a protuberance 10 taken along the line IV-IV in FIG. 3 (a plane orthogonal to the longitudinal direction of the prone 10). It is sectional drawing of the inside.

  When carrying out the first half step α, first, the water pipe 12 and the inner tube 16 are arranged in the outer tube 18, and they are fed over the entire length of the prone 10. As shown in FIG. 1, the water pipe 12 is disposed from end to end of the prone 10.

  The water flow pipe 12 has a role of securing a water passage between both sides of the roadbed 50, and water can flow through the slab 10 even after performing the urgent emergency repair method according to the present embodiment. In this way, it has a role of ensuring the water flow capacity of the prone 10.

  The foamed hard urethane 14 is filled in the gap between the inner surface of the bottom 10 and the outer surface of the water pipe 12 to support the inner surface of the bottom 10 and to prevent the bottom 10 from collapsing. Moreover, the crack which arose in the slab 10 is plugged, and the progress of deformation of the slab 10 and the outflow of earth and sand on the back surface of the slab 10 are prevented.

The foam rigid urethane 14, since these roles and effects are obtained, the compressive strength of the foam rigid urethane 14 is more preferably is preferably 8N / cm ² or more and 10 N / cm ² or more.

  The inner tube 16 is an elongated cylindrical tube, and is a tube into which the foamed hard urethane 14 is injected. The inner tube 16 has a role of preventing the injected foamed hard urethane 14 from directly contacting the inner surface of the prone 10. Since the foamed hard urethane 14 has adhesiveness, it is difficult to remove the injected foamed hard urethane 14 from the interior of the bottom 10 in the second half process β when the injected hard foam 14 directly contacts the inner surface of the bottom 10. Become.

  The outer tube 18 is an elongated cylindrical tube, and has a role of protecting the inner surface of the prone 10 when the water pipe 12 is drawn into the prone 10 and preventing the inner tube 16 from being broken.

  In addition, when filling the foamed hard urethane 14 from one side of the prone 10, the inner tube 16 may be in a bag shape having a bottom, but when filling the foamed hard urethane 14 from both sides of the prone 10 It is better to use a cylindrical tube with no bottom. This is because when the foamed hard urethane 14 is filled from both sides of the bottom 10 and the inner tube 16 is in a bag shape having a bottom, a hole for filling the foamed hard urethane 14 must be formed in the bottom. . The outer tube 18 is preferably a cylindrical tube without a bottom. This is because when the outer tube 18 has a bottom, a hole must be finally formed in the bottom of the outer tube 18 so as not to hinder the water flow function of the water pipe 12.

  Next, the spray gun 20 that injects the foamed rigid urethane 14 is the deepest part of the repaired portion of the prone 10 (when working from only one side of the prone 10) or near the center (when working from both sides of the prone 10). ) By the guide pipe 22. Two PVC pipes (not shown) for supplying two kinds of raw materials of the foamed hard urethane 14 to the spray gun 20 are attached to the guide pipe 22. As this PVC pipe, for example, a pipe having a nominal diameter of 13 mm (outer diameter of 18 mm) can be used. In FIG. 3, two guide pipes 22 appear to exist, but FIG. 3 is a cross-sectional view of the protuberance 10 cut along a vertical plane parallel to the longitudinal direction of the protuberance 10. Two cut surfaces of the guide pipe 22 are shown, and the number of guide pipes 22 is one.

  FIG. 5 is a schematic diagram of the spray gun 20. The spray gun 20 has a function of mixing two types of raw materials and injecting the foamed rigid urethane 14. Moreover, it has the function which can perform the start and completion | finish of injection of foaming hard urethane 14, and adjustment of injection amount by remote control.

  Two raw material supply hoses 20A are connected to the upper rear of the spray gun 20, and two kinds of raw materials, foamed rigid urethane 14, are supplied into the spray gun 20 from the two raw material supply hoses 20A. In the spray gun 20. Then, the amount by which the lever 20C is pulled is adjusted via the remote operation cable 20B, and the start and end of the injection of the foamed hard urethane 14 and the adjustment of the injection amount are performed by remote control. When the lever 20C is pulled via the remote control cable 20B, the foamed hard urethane 14 is jetted from the jet port 20D.

  In this way, the two types of raw materials of the foamed hard urethane 14 are mixed in the spray gun 20 and injected into the inner tube 16. While pulling back the spray gun 20 toward the inner tube 16 in accordance with the amount of the foamed hard urethane 14 injected into the inner tube 16 (to the worker performing the injection work), the foamed hard urethane 14 is deformed and the deformed portion of the prone 10 Fill the repair area centered around 10A.

  In this embodiment, a type that cures by mixing two liquids is used as the foamed hard urethane 14, but the type of foamed hard urethane that can be used as the foamed hard urethane 14 is not particularly limited. However, as the hard foamed urethane 14, it is preferable to use a type that cures by mixing two liquids. By using this type of hard foamed urethane, foaming defects are less likely to occur even if the inside of the prone 10 is filled at once.

  As the water flow pipe 12, for example, a corrugated pipe made of high-density polyethylene that can withstand external pressure and is flexible and bendable can be used. Some of the protuberances 10 are bent, and even if they are straight pipes at the time of embedment, some of them have sunk and bent up and down due to aging, so the water pipe 12 is a flexible and bendable pipe. Is preferably used.

  Although what can be used as the inner tube 16 and the outer tube 18 is not specifically limited, it is excellent in the property which can follow the inner surface of the prone 10 and the outer surface of the water flow pipe 12 with progress of filling of the foaming hard urethane 14. Preferably, for example, a polyethylene tube having a thickness of 0.05 mm to 0.5 mm can be used. However, if the sizes of the inner tube 16 and the outer tube 18 are too small, the foamed hard urethane 14 injected into the inner tube 16 cannot expand in the direction toward the inner surface of the prone 10, and the inner surface of the prone 10 is supported. Therefore, it is preferable to use, as the inner tube 16 and the outer tube 18, polyethylene tubes having a size that does not prevent the foamed hard urethane 14 from expanding in the direction toward the inner surface of the prone 10. .

  Further, from the viewpoint of preventing the rigid foam urethane 14 injected into the inner tube 16 from becoming unable to expand in the direction toward the inner surface of the prone 10, the inner tube 16 and the outer tube 18 are made of a stretchable material. It is also preferable to select a certain material.

  After the injection of the foamed hard urethane 14 into the bottom 10, as shown in FIG. 1, the gap between the inner surface of the bottom 10 and the outer surface of the water pipe 12 is covered with soil at the port portion of the bottom 10 and the water pipe 12. Close with 54. This is to fix the water pipe 12 and to prevent earth and sand from entering the gap between the prone 10 and the water pipe 12.

  The rope 24 (see FIGS. 3 and 4) is used when pulling out the foamed hard urethane 14 in the latter half process β described later.

  Before carrying out the first half step α, the inside of the prone 10 is observed with a camera or the like that automatically travels, the position of the deformed portion 10A of the prone 10 is grasped, and the range in which the foamed hard urethane 14 is filled is clarified. It is desirable to keep it. Moreover, it is desirable to hesitate the inside of the concavity 10 before carrying out the first half step α.

  Although the first half step α has been described above, by performing the first half step α, the water pipe 12 is installed in the bush 10, and water flows through the water pipe 12 and does not contact the inner surface of the bush 10. For this reason, while ensuring the water flow capability of the slab 10, it can suppress that the deformation | transformation of the slab 10 advances, and can suppress that the earth and sand of the back surface of the slab 10 flow out. . Moreover, by filling the inner surface of the deformed portion 10 </ b> A of the prone 10 with the foamed hard urethane 14, the inner surface of the prone 10 can be supported, and the collapse of the prone 10 can be prevented. Further, since the foamed hard urethane 14 is filled in the gap between the inner surface of the sag 10 and the outer surface of the water pipe 12, the volume of the space in the sag 10 is reduced, so that even if the sag 10 collapses, the roadbed 50 The degree of collapse is limited.

  From the above, by carrying out the first half step α, a serious accident can be urgently avoided, and safety can be ensured until full-scale repairs are made. Therefore, the first half process α alone is completed as an emergency repair method for the prone 10.

  The standard direct construction cost of the first half process α is about 30% of the standard direct construction cost of the current repairing method in which a lining layer is formed on the inner peripheral surface of the bottom. In addition, the standard work time at the site when the first half process α is performed is about 2.5 hours, and the standard repair method when the current repair method for forming a lining layer on the inner peripheral surface of the prone is performed locally. About 30% of the total work time.

(Second half process β)
The second half process β is a process in which the filled hard urethane 14 is broken using high-pressure water and taken out together with materials such as the water pipe 12. The material set in the first half process α is removed from the inside of the prone 10, 10 is a step of making it possible to perform full-scale repairs on 10.

  As described above, in the first half step α, the water pipe 12 is installed in the prone 10 having undergone deformation such as cracks, and the foamed hard urethane 14 is formed in the gap between the inner surface of the prone 10 and the outer surface of the water pipe 12. By filling the bottom of the bottom 10, while preventing the bottom 10 from collapsing while suppressing the progress of the deformation of the bottom 10 and the outflow of earth and sand on the back of the bottom 10, Although only the first half process α can be regarded as an emergency repair method, here, the second half process β that makes it possible to perform full repair on the prone 10 is considered in combination with the first half process α. The whole process combining the first half process α and the second half process β is regarded as one emergency repair method.

  The latter half process β will be described in more detail.

  In the latter half process β, materials such as the foamed hard urethane 14 installed in the first half process α are manually pulled out from the inside of the prone 10, but the foamed hard urethane 14 filled in the prone 10 in the first half process α in advance. Without breaking, it is difficult to pull out the material such as the hard foamed urethane 14 manually from the inside of the prone 10. Further, if an excessive force is applied, the prone 10 may be damaged.

  Therefore, in the latter half step β, first, the foamed hard urethane 14 filled in the bottom 10 is to some extent (the material installed in the first half step α can be pulled out from the inside of the bottom 10 without applying excessive force. C) Destroy with high pressure water.

  Specifically, as schematically shown in FIG. 6, in the latter half process β, the foamed hard urethane 14 filled in the concavity 10 is broken in two stages with high-pressure water. FIG. 6A is a view showing a state where the first half step α is completed (a state where the foamed rigid urethane 14 is filled between the outer surface of the water flow pipe 12 and the inner surface of the prone 10). In the first stage of destruction, as shown in FIG. 6B, a foamed hard material in which holes 14A having a relatively small diameter (for example, a diameter of about 5 to 10 cm) are filled in the prone 10 by the front breaking nozzle 30. Open in the longitudinal direction of the bottom 10 in the urethane 14. In the second stage of destruction, as shown in FIG. 6C, the foamed rigid urethane 14 is destroyed with high-pressure water so as to expand the diameter of the hole 14A by the side destruction rotating nozzle 32.

  FIG. 7 is a diagram schematically showing the front breaking nozzle 30 used for the first stage breaking with high-pressure water, and FIG. 8 is a schematic view of the front breaking nozzle 30 as viewed from the direction of arrow VIII in FIG. FIG. 9 is a diagram schematically showing the side breaking rotary nozzle 32 used for the second stage breaking with high-pressure water.

  The front breaking nozzle 30 used for the first stage breaking is a high pressure water discharge nozzle that advances forward while jetting high pressure water forward, and includes four forward injection holes 30A that jet high pressure water forward. Six rear injection holes 30B for obtaining a propulsive force are provided. More specifically, as shown in FIG. 8, the front injection hole 30 </ b> A includes one hole at the center of the front breaker nozzle 30 and three holes surrounding it. The rear part of the front breaker nozzle 30 is attached to a water supply pipe 30C (see FIG. 6B) that supplies high-pressure water.

  In the first stage of destruction, as shown in FIG. 6 (B), the front breaking nozzle 30 is sunk while jetting high-pressure water forward (substantially in the longitudinal direction of the sag 10). Then, a hole 14 </ b> A is opened in the longitudinal direction of the bottom 10 in the foamed hard urethane 14 filled in the bottom 10.

  In the second stage of destruction, the side destruction rotary nozzle 32 is used. The side breaking rotary nozzle 32 is a high-pressure water discharge nozzle that jets high-pressure water backward (diagonally) and advances forward while rotating, and as shown in FIG. 9, the side that jets high-pressure water diagonally backward. Six rear injection holes 32A are provided. Further, the rear part of the side breaking rotary nozzle 32 is attached to a water supply pipe 32B (see FIG. 6C) that supplies high-pressure water. The side breaking rotary nozzle 32 is inserted into the hole 14A opened in the first stage, and the side breaking rotary nozzle 32 is advanced in the longitudinal direction of the prone 10 while jetting high-pressure water obliquely backward. The foamed hard urethane 14 filled between the inner surface and the outer surface of the water pipe 12 is destroyed so as to expand the diameter of the hole 14A as shown in FIG.

  If it is judged that the foamed hard urethane 14 filled in the bottom 10 can be broken to such an extent that the material installed in the first half step α can be pulled out from the inside of the bottom 10 without applying excessive force, the foamed hard urethane 14 The work which destroys 14 is interrupted, and the material installed in the first half step α is pulled out from the inside of the prone 10 by human power. When pulling out the material installed in the first half step α from the inside of the prone 10, the inner tube 16 and the outer tube 18 are pulled manually, and the rope 24 (see FIGS. 3 and 4) is also pulled manually. When it is difficult to pull out the material installed in the first half step α from the inside of the prone 10, the side breaking rotary nozzle 32 is inserted into the hole 14 </ b> B (see FIG. 6C) of the foamed hard urethane 14, and the high pressure water The foaming hard urethane 14 is destroyed to such an extent that the material installed in the first half step α can be pulled out manually from the inside 10 without applying an excessive force.

  The discharge direction of the high-pressure water discharged from the front breaking nozzle 30 is preferably set so that the angle formed by the longitudinal direction of the prone 10 is 15 ° or less in the state of FIG. If the angle formed is 15 ° or less, the front foamed hard urethane 14 can be efficiently destroyed, and a hole 14A having a relatively small diameter penetrating in the longitudinal direction of the prone 10 is short in the foamed hard urethane 14. It becomes possible to provide at time. If the angle formed exceeds 15 °, the diameter of the hole 14A can be made relatively large, but it is difficult to provide the hole 14A that penetrates the foamed hard urethane 14 in a short time. Even if the diameter of the hole 14A penetrating the foamed hard urethane 14 is relatively small, it is efficient to expand the hole 14A using the side breaking rotary nozzle 32 (breaking so that the diameter of the hole 14A is increased). Since it can be performed in a relatively short time, even if the diameter of the hole 14A that penetrates the foamed hard urethane 14 is relatively small, the hole 14A that penetrates the foamed hard urethane 14 is provided in a short time. In many cases, the total work time until the material set in the first half step α is pulled out from the inside of the prone 10 is shortened.

  The discharge direction of the high-pressure water discharged from the side breaking rotary nozzle 32 is such that the angle formed with the longitudinal direction of the prone 10 is in the range of 45 ° to 60 ° in the state of FIG. It is preferable. If the angle formed is less than 45 °, the efficiency of expanding the diameter of the hole 14A may be deteriorated. Further, if the angle formed is more than 60 °, the propulsive force forward of the side breaking rotary nozzle 32 is reduced, and it may take a long time to expand the hole 14A penetrating the foamed rigid urethane 14 over the entire length. is there.

  Moreover, it is preferable that the pressure of the high pressure water supplied to the front destruction nozzle 30 and the side destruction rotation nozzle 32 is 12-18 MPa. If the pressure of the high-pressure water is less than 12 MPa, the time required for breaking the foamed rigid urethane 14 may be increased. If the pressure of the high-pressure water exceeds 18 MPa, the equipment for supplying high-pressure water is reduced in size. This is because it may be difficult to achieve. From the viewpoint of shortening the time required for destroying the foamed rigid urethane 14 and reducing the size of the equipment for supplying high-pressure water, the pressure of the high-pressure water supplied to the front breaking nozzle 30 and the side breaking rotating nozzle 32 is More preferably, it is 15-17 MPa, and it is especially preferable that it is 15.5 MPa-16.5 MPa.

  In addition, it is preferable to stop the destruction of the foamed hard urethane 14 by the high pressure water to such an extent that the inner tube 16 and the outer tube 18 are not damaged. This is because if the inner tube 16 and the outer tube 18 are not damaged, it is easy to collect the foamed hard urethane 14 that has been destroyed by the high-pressure water.

  As described above, the front breaking nozzle 30 and the side breaking rotating nozzle 32 used in the latter half process β and the latter half process β have been described in detail, but the described front breaking nozzle 30 and side breaking rotating nozzle 32 break the foamed rigid urethane 14. The high-pressure water discharge nozzle that can be used in the present invention is not limited to the nozzle having the shape shown in FIGS.

  The standard direct construction cost for the latter half process β is about 10% of the standard direct construction cost for the current repair method for forming a lining layer on the inner peripheral surface of the hump. The first half process α and the second half process The total standard direct construction cost combined with β is about 40% of the standard direct construction cost of the current repairing method in which a lining layer is formed on the inner peripheral surface of the bottom.

  Next, embodiments will be described. In the following description of the embodiments, the same components as those shown in FIG. 6 may be denoted by the same reference numerals.

(Example 1 for the first half step α)
A test for confirming that the foamed rigid urethane 14 was filled in the gap between the inner surface of the bottom 10 and the outer surface of the water pipe 12 by performing the first half step α was performed.

Since it is difficult to test with actual proneness, the straight void pipe with a diameter of 250 mm is considered prone, and the straight PVC pipe with a pipe diameter of 100 mm is regarded as a water pipe, and the filling state of foamed rigid urethane is checked. A test was conducted to confirm. Since this is a test for confirming the state of filling with foamed hard urethane, the test was conducted without using the outer tube and the inner tube. The compressive strength of the foamed hard urethane used is 8.3 N / cm ² .

  FIG. 10 is a photograph of the situation immediately after the start of filling of hard urethane foam into the gap between the inner surface of a void tube having a tube diameter of 250 mm and the outer surface of a PVC tube having a tube diameter of 100 mm, and FIG. 12 is a photograph of a situation in which foamed rigid urethane is being filled in the gap between the inner surface of the Void tube and the outer surface of the PVC tube having a diameter of 100 mm. FIG. 12 shows the inner surface and the tube of the Void tube having a diameter of 250 mm. FIG. 13 is a photograph of the situation when the filling of the foamed hard urethane into the gap with the outer surface of the 100 mm diameter PVC pipe is completed, and FIG. 13 is a pipe taken by cutting the void pipe after the filled foamed hard urethane is cured. It is a photograph of a PVC pipe having a diameter of 100 mm.

  As can be seen from FIGS. 10 to 12, it was confirmed that the hard urethane foam was satisfactorily filled in the gap between the inner surface of the void tube having a tube diameter of 250 mm and the outer surface of the PVC tube having a tube diameter of 100 mm. From FIG. 13, it can be seen that the hardened foamed hard urethane has penetrated between the void pipe and the water pipe. Although it is difficult to read from FIG. 13, in reality, the spiral surface shape of the inner surface of the void tube is transferred to the surface of the hardened foamed hard urethane. Even if it was, it was confirmed that it was filled well.

(Example 2 for the first half step α)
In Example 2, a filling test of foamed rigid urethane was performed using an outer tube and an inner tube. The compressive strength of the foamed hard urethane used in the test is 8.3 N / cm ^2, which is the same as in Example 1.

  In Example 2, a straight void tube having a pipe diameter of 300 mm (hereinafter sometimes referred to as “simulated prone”) is regarded as prone, and a straight corrugated polyethylene pipe having a pipe diameter of 150 mm (hereinafter referred to as “simulated pass”). A test for confirming the filling state of the foamed hard urethane was conducted with a water pipe as a water pipe.

  The outer tube and the inner tube are originally larger than the diameter of the prone tube (here, the diameter of the simulated prone tube is 300 mm), but in Example 2, in order to confirm the elongation of the tube, A cylindrical polyethylene tube (thickness: 0.2 mm) having a diameter of 290 mm was used for both the outer tube and the inner tube. A spray gun, guide pipe and rope were also used. These materials were arranged in the same manner as in FIG. FIG. 14 is a photograph of a state where the arrangement of these materials is completed.

  The inner tube was filled with foamed hard urethane.

  When the outer tube was manually pulled out from the inside of the simulated prone after curing of the hard foamed urethane, it could be easily pulled out with all materials including the simulated water pipe and the hardened hard urethane. Therefore, it is considered that the foamed hard urethane does not apply pressure to the inner surface of the simulated prone, and the foamed hard urethane used in this Example 2 cannot stretch the outer tube and the inner tube used in this Example 2. Probably not. Therefore, in order to support the foamed hard urethane on the inner surface of the sag and prevent collapse of the sag, it is preferable to use an outer tube and an outer tube whose outer diameter is sufficiently larger than the inner diameter of the sag. it is conceivable that.

  FIG. 15 is a photograph of the material pulled out from the simulated prone.

  FIG. 16 is a photograph of a cross section of the hard foamed urethane after curing in the inner tube. The hard urethane foam in the inner tube was constrained by the outer tube and the simulated water pipe, and was cured in a crescent shape.

  FIG. 17 is a photograph of the appearance of the cured hard urethane taken out from the inner tube. The shape of a simulated water pipe (corrugated polyethylene pipe) was transferred to the inner surface of the cured hard urethane foam taken out from the inner tube, and the hard foam urethane was appropriately filled into a small gap.

(Example 3 for the latter half process β)
A test was conducted to remove materials such as foamed hard urethane provided in the sag in the first half step α.

  Since it is difficult to perform a test with an actual sag, a removal test of materials such as foamed rigid urethane was performed using the shampoo 40 shown in FIG. 18 and the shampoo 42 shown in FIG. The simulated prone 40 shown in FIG. 18 is a PVC pipe having a length of 4 m and a pipe diameter of 250 mm, and is a straight pipe. On the other hand, the simulated prone 42 shown in FIG. 19 is a pipe having a total length of 3.5 m having a bent portion formed by connecting two PVC pipes 44 having a pipe diameter of 250 mm with elbows having an angle of 11 °. Two simulated prone 42 were produced.

  The reason why the removal test was also performed using the simulated prone 42 having a bent part is that the prone part is bent, and even if it is a straight pipe at the beginning of the burial, part of it will submerge due to secular change and bend up and down This is because there are not a few of them.

As the outer tube and inner tube, cylindrical polyethylene tubes (thickness 0.2 mm) with a diameter of 290 mm were used. Similarly to the second embodiment for the first half step α, the spray gun, the guide pipe, and the rope are arranged in the same manner as in FIG. 3, the inner tube is filled with foamed hard urethane, and the foams 40 and 42 are foamed. Filled with hard urethane. The filled foamed urethane has a compressive strength of 8.3 N / cm ^2, which is the same as in Example 1.

  A test for removing materials such as foamed hard urethane provided in the simulated knee 40 was performed 6 days after filling the foamed urethane in the simulated knees 40 and 42 (after curing for 5 days).

  In the same manner as described above with reference to FIG. 6, the foamed hard urethane 14 filled in the simulated flap 40 was broken in two stages using high-pressure water. Specifically, in the same manner as shown in FIG. 6B, first, the front breaking nozzle 30 (nozzle diameter is 50 mm) is formed with a relatively small diameter hole 14A in the foamed hard urethane 14 and the length of the prone 10 Opened in the direction. The diameter of the hole 14A was about 75 mm. In the second stage of destruction, the foamed hard urethane 14 was broken with high-pressure water so as to expand the diameter of the hole 14A by the side breaking rotary nozzle 32, as shown in FIG. 6C.

  The high-pressure water was supplied by a high-pressure washing vehicle having a maximum pressure of 20 MPa and a washing water discharge amount of 230 L / min.

Table 1 shows the results of opening the holes 14A with the front break nozzle 30 in the rigid foam urethane 14 in the straight pipe simulation 40 by changing the pressure of the high pressure water to 10 MPa, 12 MPa, 14 MPa, and 16 MPa.

  When the pressure of the high-pressure water was 10 MPa, the foamed hard urethane 14 could not be broken (a hole could not be opened). When the pressure of the high-pressure water was 12 MPa, the foamed hard urethane 14 could be broken (a hole could be opened), but it took time to break (open a hole). When the pressure of the high-pressure water was 14 MPa, the foamed hard urethane 14 could be broken in a shorter time than when the pressure of the high-pressure water was 12 MPa (a hole could be opened). When the pressure of the high-pressure water was 16 MPa, the foamed hard urethane 14 could be broken in a shorter time and with a larger degree of breakage (pore diameter) than when the pressure of the high-pressure water was 14 MPa.

  From this result, it is judged that the pressure of the high-pressure water is 16 MPa, and in the removal test using the simulated prosthesis 42 having a bent portion, the pressure of the high-pressure water is the first-stage destruction and the second-stage destruction. Both tests were conducted at 16 MPa, and the time required for the breaking work was also measured.

  First, a hole 14A having a relatively small diameter (about 75 mm in diameter) is formed on the foamed hard urethane 14 filled in the bottom 10 as shown in FIG. Opened in the direction. The holes 14A were made in the two simulated prone 42 (No. 1 and No. 2). No. 1 is 12 minutes 43 seconds. 2 was 9 minutes 45 seconds. By simply opening the hole 14A having a diameter of about 75 mm using the front breaking nozzle 30, the material such as the foamed rigid urethane 14 could not be drawn out from the inside of the simulated prone 42.

  Next, as shown in FIG. 6C, the foamed hard urethane 14 was broken using the side breaking rotary nozzle 32 so as to expand the diameter of the hole 14A. However, by moving the inside of the hole 14A by one way (3.5 m) of the simulated prone 42 and expanding the diameter of the hole 14A for about 25 seconds, the material such as the hard foam urethane 14 is removed from the simulated prone 42. I couldn't pull it out.

  Therefore, the diameter of the hole 14A was expanded using the side breaking rotary nozzle 32 until the material such as the foamed rigid urethane 14 could be pulled out from the simulated prone 42 without applying excessive force. The time required until the material such as the foamed hard urethane 14 can be pulled out from the simulated prone 42 is No. 1 is 2 minutes and 40 seconds. 2 was 3 minutes 55 seconds. The shape of the hole 14A opened using the front breaking nozzle 30 (the shape in the cross section orthogonal to the longitudinal direction of the simulated prone 42) was almost a clean circle, but the hole 14A was formed using the side breaking rotating nozzle 32. After breaking to expand the diameter of the, it did not keep a clean circle.

The following Table 2 shows the working time and the like by the side breaking rotary nozzle 32 required until the material such as the foamed hard urethane 14 can be drawn out from the simulated slab 42.

  As can be seen from the results shown in Table 2, the working time by the side breaking rotary nozzle 32 required to draw out the material such as the foamed rigid urethane 14 from the simulated bottom 42 is about 40 to 70 s per 1 meter of the bottom. It is believed that there is. However, since the required work time may vary depending on the situation at the site, in the actual site, the foamed rigid urethane can be pulled out from the inside of the burrow without applying excessive force. It is considered desirable to proceed with the work in the latter half process β while appropriately determining whether or not the destruction has progressed.

DESCRIPTION OF SYMBOLS 10 ... Sag 10A ... Deformation part 12 ... Water pipe 14 ... Hard foam urethane 14A ... Hole 14B ... Hole 16 ... Inner tube 18 ... Outer tube 20 ... Spray gun 20A ... Raw material supply hose 20B ... Remote operation cable 20C ... Lever 20D ... Injection port 22 ... Guide pipe 24 ... Rope 30 ... Front breaking nozzle 30A ... Front injection hole 30B ... Back injection hole 30C ... Water supply pipe 32 ... Side destruction rotation nozzle 32A ... Side rear injection hole 32B ... Water supply pipe 40, 42 ... Simulated prone 44 ... PVC pipe 46 ... Elbow 50 ... Roadbed 52 ... Railway track 54 ...

Claims (8)

Installing a water pipe having an outer diameter smaller than the inner diameter of the sag in the sag;
Installing a tube into which the foamable material is injected in the prone,
Injecting a foamable material into the tube placed in the prone,
Have
The tube is located between the inner surface of the sag and the outer surface of the water pipe, and the foamable material injected into the tube is filled between the inner surface of the sag and the outer surface of the water pipe. And the filled foamable material is cured to support the inner surface of the sag and prevent the sag from falling. A foamable material destruction step of breaking the foamable material filled between the inner surface of the sag and the outer surface of the water pipe with high-pressure water;
Removing the broken foamable material from within the sag;
The method of claim 1, further comprising:   In the foamable material breaking step, the sag is formed by a first high-pressure water discharge nozzle that jets high-pressure water forward onto the foamable material filled between the inner surface of the sag and the outer surface of the water pipe. A second high-pressure water discharge nozzle for injecting high-pressure water laterally is inserted into the hole, and the second high-pressure water discharge nozzle is inserted in the longitudinal direction of the sag. The method according to claim 2, wherein the foamable material filled between the inner surface of the sag and the outer surface of the water pipe is destroyed.   The method of claim 3, wherein the pressure of the high-pressure water is 12 to 18 MPa.   The said tube does not prevent that the said foamable material inject | poured in this tube expand | swells in the inner surface direction of the said scap, The emergency repair of the scap according to any one of Claims 1-4 characterized by the above-mentioned. Method.   The method of claim 1, wherein the tube is made of polyethylene and has a cylindrical shape.   The method according to claim 1, wherein the foamable material is foamed hard urethane.   The method of claim 1, wherein the water pipe is freely bendable.