JP4890312B2 - Pipe bridge rehabilitation method - Google Patents

Description

  The present invention relates to a method for rehabilitating a pipe bridge such as a water pipe bridge or a gas pipe bridge.

  In general, many existing pipelines such as water pipes and gas pipes are buried in the lower ground of roads and buildings. These existing pipelines are subject to corrosion, deterioration, etc. with the years of use, so it is necessary to periodically repair and renovate the pipelines to prevent water leakage, gas leakage, or to preserve the sanitary environment. is there.

  Conventionally, for example, a method for rehabilitating an existing pipe line as shown in Patent Document 1 has been proposed as a method for rehabilitating such an existing pipe line. In this existing pipe rehabilitation method, a liner impregnated with a thermosetting resin is inserted into an existing pipe and pulled in, then expanded by applying internal pressure to the inside of the liner, and further heated to cure the liner. The liner is fixed in the existing pipeline. This makes it possible to reuse the existing pipe without replacing the existing pipe.

For example, as shown in Patent Document 2, a method of inserting and arranging a liner by inserting a fluid pressure in the liner and inverting the liner in the existing pipe has been proposed.
Japanese Patent Laid-Open No. 11-230212 Japanese Unexamined Patent Publication No. 63-254028

  By the way, not only the buried pipe which is an existing pipe buried in the ground but also a pipe bridge such as a water pipe bridge or a gas pipe bridge exposed on the ground surface naturally occurs. In particular, pipeline bridges exposed on the surface of the earth are susceptible to the influence of weather, etc., and are more susceptible to corrosion than buried pipes, so rehabilitation work must be carried out frequently.

  FIG. 9 shows a configuration in the case where the above-described technology disclosed in Patent Document 1 is applied to the pipeline bridge 101. The pipe bridge 101 connects the buried pipes 111a and 111b, and both ends thereof are supported by the support part 113 on the abutment 114. In particular, the pipe bridge 101 and the buried pipes 111a and 111b are connected via a curved pipe 112 in order to adjust the altitude because their installation altitudes are different.

  When the liner 102 is to be introduced into the pipeline bridge 101, an introduction port for introducing the liner 102 into the pipeline bridge 101 and an arrival port for connecting the wire 121 for pulling the liner 102 are required. The wire 121 is inserted in advance from the arrival port to the introduction port through the pipe bridge 101. If there is a manhole (not shown) that communicates with the conduit bridge 101 around the conduit bridge 101, the inlet and the reaching port pull the liner 102 into the conduit bridge 101 using the manhole as an introduction port. When there is no manhole around the pipeline bridge 101, the shaft 115 is excavated around the pipeline bridge 101 to provide the introduction port 116a and the arrival port 116b.

  In such a conventional method for rehabilitating an existing pipe line, it is necessary to use a manhole around the pipe bridge 101 or to excavate a shaft 115 when attempting to rehabilitate the pipe bridge 101. Generally, since general roads are laid around manholes and the upper part of buried pipes, it is necessary to regulate traffic on the roads around manholes to be used for rehabilitation work. It was happening. In particular, when there are no manholes around the pipeline bridge, it is necessary to excavate and landfill the shafts, and in addition to the occurrence of traffic obstacles over a long period of time, construction costs and the number of processes will increase. There was a problem.

  Further, in order to introduce the liner 102 from the introduction port 116 a into the pipe bridge 101, it is necessary to draw the liner 102 through the curved pipe 112. For this reason, in the technique disclosed in Patent Document 1, when the liner 102 is pulled in, the liner 102 is caught by the curved pipe 112 and workability is lowered. Further, the liner 102 is rubbed in the curved pipe 112. Problems such as damage occurred.

  Furthermore, if an introduction port is provided without using a manhole or shaft 115, it is conceivable that one end side of the pipeline bridge 101 is cut to provide an opening, and the liner 102 is drawn from there. However, when the pipe bridge 101 is cut in this way, it is necessary to perform welding when repairing the cut portion. Since the welded portion thus provided cannot perform inner surface corrosion prevention, there arises a problem that periodic repair is required.

  In particular, in the technique disclosed in Patent Document 2, in order to apply fluid pressure in the liner 102, it is necessary to install a large-scale bag or the like around the inlet of the liner 102. For this reason, the work of cutting the pipeline bridge 101 to provide an introduction port and installing such a large ridge on the abutment 114 is accompanied by great danger.

  Therefore, the present invention has been devised in view of the above-described problems, and the purpose of the present invention is to rehabilitate the pipeline bridge without using a manhole or excavating a vertical shaft, and reducing the construction space. It is another object of the present invention to provide a pipeline bridge rehabilitation method capable of rehabilitating a pipeline bridge without cutting the pipeline bridge while saving.

  In order to solve the above-mentioned problems, the present inventor forms an opening on one end side of the main pipe by removing the detachable pipe, and forms a hollow cylindrical inner surface water-tight layer made of an airtight material, and heating or light. A flexible cylindrical body having a resin-impregnated layer that covers the inner surface water-tight layer and an exterior protective layer that covers the resin-impregnated layer is impregnated in the nonwoven fabric with a curable resin that is cured by irradiation of A flexible tubular body is disposed along the axial direction of the main pipe, and a gas or liquid is press-fitted into the inner surface watertight layer so that the outer protective layer is pressed against the inner face of the main pipe, and the resin impregnated layer is formed. On the other hand, a pipe bridge rehabilitation method was invented in which a flexible cylindrical body is fixed to the inner surface of the main pipe by irradiating heat or light from within the inner water-tight layer to cure the curable resin.

That is, the pipe bridge rehabilitation method according to claim 1 of the present invention is a pipe bridge rehabilitation for rehabilitating a pipe bridge having a hollow tubular main pipe and a detachable pipe detachable from the main pipe attached to at least one end of the main pipe. In the method, there is a removal step of forming an opening on one end side of the main pipe by removing the detachable pipe, a hollow cylindrical inner surface watertight layer made of an airtight material, and a curable resin that is cured by heating or light irradiation. A flexible cylindrical body having a resin impregnated layer that is impregnated into the nonwoven fabric and covers the inner watertight layer and an exterior protective layer that covers the resin impregnated layer is introduced from the opening, and is allowed along the axial direction of the main pipe. Arrangement step of arranging the flexible cylindrical body, press-in step of press-fitting the outer protective layer against the inner surface of the main pipe by press-fitting gas or liquid into the inner surface watertight layer, and inner surface with respect to the resin impregnated layer Curing by heating or irradiating light from within the watertight layer Possess a curing step of fixing the flexible tubular body to the inner surface of the main pipe by curing the resin, in the arrangement step, the folded portion by a flexible tubular body is folded longitudinally The rear end portion of the formed flexible cylindrical body is held on one end side of the main pipe, and the turn-up section is pressed from the inside toward the other end side of the main pipe, thereby turning the turn-up section into the axis of the main pipe. A flexible cylindrical body is arranged by sequentially moving along the direction .

The pipe bridge rehabilitation method according to claim 2 of the present application is characterized in that, in the invention according to claim 1, in the arranging step, the folded portion of the flexible tubular body that is further folded in the short direction is pressed. To do.

In the pipe bridge rehabilitation method according to claim 3 of the present application, in the invention according to claim 1 or 2 , in the press-fitting step, the resin-impregnated layer is exposed by peeling a part of the exterior protective layer in advance, and the main pipe and the main pipe The exposed resin impregnated layer is pressure-bonded to the inner surface of the main pipe located around the connection port with the branch pipe branched from the outside .

The method for rehabilitating a pipeline bridge according to claim 4 of the present invention is the invention according to claim 3 , wherein a hollow cylindrical form tube having an outer diameter smaller than the inner diameter of the branch pipe is inserted into the branch pipe before the press-fitting step. And a filling step of filling the gap formed between the inner wall of the branch pipe and the outer wall of the mold tube between the press-fitting step and the curing step to form a branch pipe resin layer. In the curing step, the curable resin constituting the branch pipe resin layer is cured together with the curable resin impregnated in the resin impregnated layer .

A pipe bridge rehabilitation method according to claim 5 of the present invention is a pipe bridge rehabilitation for rehabilitating a pipe bridge having a hollow tubular main pipe and a detachable pipe detachable from the main pipe attached to at least one end of the main pipe. In the method, a removal step of forming an opening on one end side of the main pipe by removing the detachable pipe, a hollow cylindrical inner surface watertight layer made of an airtight material, and a curable property that is cured by heating or light irradiation. A flexible cylindrical body having a resin-impregnated layer impregnated with a non-woven fabric and covering the inner water-tight layer and an exterior protective layer covering the resin-impregnated layer is introduced from the opening, and the main pipe An arrangement step of arranging the flexible cylindrical body along the axial direction, and press-fitting to press-fit the outer protective layer against the inner surface of the main pipe by press-fitting gas or liquid into the inner surface watertight layer Process and the resin impregnated layer A curing step of fixing the flexible cylindrical body to the inner surface of the main pipe by curing the curable resin by heating or irradiating light from within the inner surface water-tight layer. Prior to the process, a hollow cylindrical form tube having an outer diameter smaller than the inner diameter of the branch pipe branched from the main pipe is inserted into the branch pipe, and between the press-fitting process and the curing process. And a filling step of filling the gap formed between the inner wall of the branch pipe and the outer wall of the formwork tube with the curable resin to form a branch pipe resin layer, The resin impregnated layer is exposed by peeling off a part of the outer protective layer in advance, and the exposed surface is exposed to the inner surface of the main pipe located around the connection port between the main pipe and the branch pipe. The resin impregnated layer is pressure-bonded, and in the curing step, the curable resin constituting the branch pipe resin layer is formed. The characterized in that curing with the curable resin impregnated into the resin impregnated layer.

In the pipe bridge rehabilitation method according to claim 6 of the present application, in the invention according to claim 5, in the arrangement step, the main end of the flexible cylindrical body is connected to the main pipe from the opening through the main pipe. The flexible cylindrical body is arranged by pulling to the other end side of .

The pipe bridge rehabilitation method according to claim 7 of the present invention is characterized in that, in the invention according to claim 6, in the placement step, the front end portion of the flexible tubular body folded in the short direction is pulled. To do.

The pipe bridge rehabilitation method according to Claim 8 of the present invention is the invention according to any one of Claims 1 to 7, wherein the flexible cylindrical body outer protective layer is disposed before the press-fitting step. A peeling step of peeling the exterior protective layer located on one end side and the other end side of the main pipe from the flexible tubular body; and in the press-fitting step, the peeled exterior protective layer covers The resin impregnated layer that has been used is pressed against the inner surface of the main pipe .

  In the present invention having the above-described configuration, rehabilitation is completed without cutting or welding the main pipe, so that it is possible to prevent internal corrosion from the welded portion in the main pipe, which has occurred in the past, and the quality of the pipeline bridge over a long period of time. The performance can be maintained. Furthermore, in the present invention, since it is not necessary to introduce the liner to the main pipe through the inside of the curved pipe as in the prior art, the liner can be arranged more smoothly, and further, the liner has a frictional resistance in the curved pipe. Therefore, it is possible to rehabilitate the pipeline bridge while maintaining the strength and quality of the liner. Furthermore, in the present invention, it is not necessary to use a manhole or excavate a shaft for cutting the buried pipe in the liner placement process, so that the rehabilitation can be performed without causing a traffic obstacle. In addition, since the construction process is reduced, the construction period and construction cost can be saved.

  Furthermore, in the present invention according to claim 6 described above, the inner surface of the main tube can be easily made into a sealed body by a simple method by simply peeling off the exterior protective layers on both ends of the main tube. It is possible to suppress the progress of corrosion. Furthermore, this makes it possible to reduce the process of attaching a water stop member, a connection member, etc. for the pipe opening protection process, and to restore the pipeline bridge at an early stage.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Fig.1 (a) has shown the block diagram of the pipeline bridge 1 to which the pipeline bridge rehabilitation method of this invention is applied. The pipe bridge 1 is configured to support a main pipe 11, a detachable pipe 12 detachable from the main pipe 11 attached to one end side or both end sides of the main pipe 11, and both ends of the main pipe 11 on the abutment 14. The support part 13 is comprised.

  The pipe bridge 1 is a bridge constituted by a single or a plurality of pipes, and connects the buried pipe 31a and the buried pipe 31b located at remote locations across the obstacle W such as a river or a valley. Is possible. Normally, the pipe bridge 1 and the buried pipe 31 are connected via a curved pipe 32 in order to adjust the altitude of both pipes because the installation elevations of both pipes are different. The pipe bridge 1 is used for conveying various fluids such as domestic water, factory water, and gas through the main pipe 11, or various cables such as communication cables and power cables in the main pipe 11. Used for laying through. The pipe bridge 1 is embodied by, for example, a pipe provided alongside a water pipe bridge, a gas pipe bridge, or a general bridge.

  The main pipe 11 is a tubular body having a hollow cross section, and is embodied by a stainless steel pipe, an aluminum pipe, a steel pipe, a concrete pipe or the like, a vinyl chloride pipe, or a resin pipe such as a polyethylene pipe. The main pipe 11 is also embodied by a Teflon pipe made of Teflon (registered trademark) such as tetrafluoroethylene resin. The main pipe 11 may be configured not only in a circular cross section but also in any cross sectional shape such as a square cross section. In addition to the case where the main pipe 11 is configured as a linear pipe body, the main pipe 11 may be configured as a curved pipe body, for example.

  The detachable pipe 12 is normally provided at both ends or one end of the main pipe 11 of the pipe bridge 1 and can be easily attached and detached from the main pipe 11 without cutting or welding. It is. The detachable tube 12 is embodied by, for example, an expandable tube, a flanged tube, or a mechanical joint tube.

  The pipeline bridge rehabilitation method to which the present invention is applied is performed by introducing a liner 2 as shown in FIG. The liner 2, for example, as shown in FIGS. 2A and 2B, covers a hollow cylindrical inner surface watertight layer 21, a resin impregnated layer 22 that covers the inner surface watertight layer 21, and a resin impregnated layer 22. It is configured as a flexible cylindrical body having at least three layers with the exterior protective layer 23.

  The liner 2 is not limited to the rehabilitation of the pipeline bridge 1 and is also applied when rehabilitation work is performed on a buried pipe 31 in the ground or a pipe such as a pipe in a building. Moreover, since the liner 2 has flexibility as a whole, it is possible to rehabilitate the main pipe 11 without being limited by the cross-sectional shape of the main pipe 11.

  The inner surface watertight layer 21 is made of a material having impermeability, stretchability, and flexibility, and is embodied by, for example, polyethylene, polyurethane, polypropylene, or the like. For this reason, various fluids are prevented from leaking and permeating through the inner surface watertight layer 21.

  The resin impregnated layer 22 is configured by impregnating a nonwoven fabric with a curable resin that is cured by heating or light irradiation. The curable resin impregnated in the resin-impregnated layer 22 may be any known material as long as it is a material generally used as a curable resin that is cured by heating or light irradiation. It is embodied by polyester resin, vinyl ester resin, epoxy resin or the like. Further, as the curable resin, a curable resin made of a specific material may be used according to the nature and amount of the gas or liquid flowing inside the pipe bridge 1.

  The exterior protective layer 23 is made of a material having flexibility and stretchability, and is embodied by, for example, a film or fiber such as polyester, polyethylene, polypropylene, polyethylene terephthalate, or the like. Further, the exterior protective layer 23 may be made of a material having a certain degree of wear strength, and may thereby be provided with resistance to wear destruction.

  Further, the exterior protective layer 23 may include a material having a high tensile elastic modulus in the axial direction of the liner 2 therein. Thereby, when a tensile stress is applied by pulling the liner 2 or the like, the elongation of the liner 2 in the axial direction can be suppressed. Further, this makes it difficult for plastic deformation to occur even when the liner 2 is pulled, so that the liner 2 can be pulled while securing the thickness of the liner 2.

  The liner 2 may be bonded with, for example, an epoxy resin adhesive or the like in order to improve the adhesion between the layers. The liner 2 may be configured to adjust the thickness of each layer or to superimpose a plurality of layers in order to improve the strength. Further, in order to improve the strength of the liner 2, a reinforcement (not shown) made of a fiber such as polyester or carbon fiber or a woven fabric is provided inside the inner water-tight layer 21, the resin-impregnated layer 22 or the exterior protective layer 23, or between each layer. You may make it contain a material.

  Next, the process of the pipeline bridge rehabilitation method to which the present invention is applied will be described in detail with reference to FIG.

  First, in the removal process of step S11, in order to prevent the fluid flowing in the buried pipes 31a and 31b from flowing into the main pipe 11, the buried pipes 31a and 31b leading to the pipeline bridge 1 or curved A water stopcock 35 is installed inside the pipe 32. After that, the detachable pipes 12a and 12b attached to both end sides of the main pipe 11 are removed from the main pipe 11, and the introduction port 15a and the arrival port 15b which are the opening portions 15 are provided on both end sides of the main pipe 11. Each is formed. Thereby, the inlet 15a for introducing the liner 2 into the main pipe 11 is provided.

  Next, the process proceeds to the arrangement step of step S12. In this arrangement step, first, the wire 33 is inserted through the main pipe 11 from the arrival port 15b to the introduction port 15a. This wire 33 is for pulling the liner 2 from the introduction port 15 a to the arrival port 15 b, one end side is attached to a winch 34 for winding the wire 33, and the other end side is attached to the front end 2 a of the liner 2. Installed. Thereafter, the liner 2 is pulled through the main pipe 11 from the introduction port 15a to the arrival port 15b by operating the winch 34 and winding the wire 33. Thus, the liner 2 is arranged from the introduction port 15a to the arrival port 15b along the axial direction in the main pipe 11.

  In the arrangement process of step S12, it is only necessary that the liner 2 is introduced from the introduction port 15a and arranged along the axial direction in the main pipe 11 that is the object of rehabilitation. That is, for example, when the inner diameter of the main pipe 11 is sufficiently large, instead of pulling the liner 2 by the wire 33, a person enters the main pipe 11 and directly introduces the liner 2 through the introduction port 15a. It may be arranged.

  Further, in the arrangement step of step S12, a lubricant made of liquid, powder, or the like may be applied to the surface of the exterior protective layer 23 in advance. As a result, when the liner 2 is pulled inside the main pipe 11, the frictional resistance between the surface of the exterior protective layer 23 and the inner face of the main pipe 11 is reduced, so that the towing operation can be performed more smoothly. Become. In addition, since it can be pulled while reducing the frictional resistance, it is possible to suppress the liner 2 from being stretched in the pulling direction, and further, it is possible to lengthen the construction extension while ensuring the thickness and quality of the liner 2. It becomes.

  Furthermore, in the arrangement step of step S12, the arrangement may be made in the main pipe 11 by pulling the front end portion of the liner 2 that has been folded in the short direction in advance. Thereby, when the liner 2 is pulled, the area where the outer protective layer 23 contacts the inner surface of the main pipe 11 is reduced, so that the towing operation can be performed more smoothly. Furthermore, it can further suppress that the liner 2 is extended in the pulling direction, and the strength of the entire liner 2 is improved. The liner 2 may be folded a plurality of times in the short direction.

  Next, the process proceeds to the peeling process of step S13, and the liner 2 is a resin-impregnated layer that has been covered with the exterior protective layer 23 from which the exterior protective layer 23 located on one end side and the other end side of the main pipe 11 has been peeled off. 22a is exposed. In this step S13, for example, as shown in FIG. 4A, when the liner 2 is pressure-bonded to the inner surface of the main pipe 11, an exterior protective layer 23 located in a range straddling the pipe port 11a at the end of the main pipe 11 is used. It is desirable to expose the resin-impregnated layer 22a by peeling the layer. Thus, the peeling process can be easily performed around the opening 15 and the work can be performed while confirming that the exterior protective layer 23 has been peeled off.

  Note that the peeling process in step S13 may be performed at any stage before the press-fitting process in step S14. However, if the peeling step is performed before the placement step of step S12, the exposed resin impregnated layer 22 is damaged by the frictional resistance when pulling the inside of the main pipe 11 in the placement step. It is desirable to do this later. Moreover, the peeling process of step S13 is not necessarily performed, but in this case, when the liner 2 is disposed in the main pipe 11, the exterior protective layer 23 located at both ends of the main pipe 11 is previously peeled off. There is a need.

  Next, the process proceeds to the press-fitting process in step S14. In this press-fitting process, gas or liquid is press-fitted into the inner surface water-tight layer 21 from one end side of the liner 2, and the resin-impregnated layer 22 and the exterior protective layer 23 that cover the inner surface water-tight layer 21 are integrated with the inner surface water-tight layer 21. The outer surface of the outer protective layer 23 is pressed against the inner surface of the main pipe 11. That is, the liner 2 has a shape that comes into close contact with the inner surface of the main pipe 11 as shown in FIG.

  In the press-fitting process in step S14, it is desirable that not only the exterior protective layer 23 but also the resin-impregnated layer 22a exposed in the peeling process is pressed against the inner surface of the main pipe 11. As a result, the curable resin oozes out from the resin impregnated layer 22a to the inner surface of the main tube 11 to improve the adhesion between both surfaces, and as a result, the outer surface of the outer protective layer 23 and the main tube 11 that are pressure-bonded. The sealing property between the inner surface is improved.

  For example, as shown in FIG. 4B, when there is a branch pipe 16 branched from the main pipe 11, it is desirable to peel off the exterior protective layer 23 as follows in the peeling step. That is, when there is the branch pipe 16, the exterior protective layer 23 located around the connection port 17 of the branch pipe 16 branched from the main pipe 11 when the liner 2 is crimped to the main pipe 11. Is previously peeled to expose the resin-impregnated layer 22b. In the press-fitting step, the resin-impregnated layer 22b exposed together with the resin-impregnated layer 22a is also pressure-bonded to the inner surface of the main pipe 11 positioned around the connection port 17. As a result, the adhesion between the inner surface of the main pipe 11 around the connection port 17 and the resin-impregnated layer 22b is also improved. As a result, even when the main pipe 11 has the branch pipe 16, the outer protective layer is pressure-bonded. The sealing performance between the outer surface of 23 and the inner surface of the main pipe 11 is improved.

  Incidentally, when the outer protective layer 23 contains a material having a high tensile modulus in the axial direction of the liner 2, it is possible to suppress excessive expansion in the axial direction due to the expansion of the liner 2 in the main press-fitting step. This process can be executed while ensuring the thickness of the liner 2.

  The liner 2 may be adjusted in the thickness of each layer according to the pressure applied from the inside of the liner 2 in the main press-fitting step.

  Next, the process proceeds to the curing step of step S15. In this curing step, the resin-impregnated layer 22 is heated or irradiated with light from the inner surface watertight layer 21 to cure the curable resin in the resin-impregnated layer 22. Here, when the curable resin impregnated in the resin impregnated layer 22 is a thermosetting resin, the liquid or gas flowing into the inner surface watertight layer 21 is heated, or another heated liquid is further added. The curable resin is cured by flowing in or by press-fitting heated steam into the inner surface watertight layer 21. Further, when the curable resin impregnated in the resin impregnated layer 22 is a photocurable resin, a light irradiation device (not shown) is inserted in the inner surface watertight layer 21 in advance, and the light irradiation device applies the resin impregnated layer to the resin impregnated layer. The curable resin is cured by irradiating light.

  By performing this curing process, the liner 2 is fixed in the main pipe 11 while maintaining the shape crimped in the main pipe 11 in the crimping process. Here, the resin-impregnated layer 22 functions as a mold that maintains the shape in which the liner 2 is pressure-bonded to the inner surface of the main pipe 11.

  In particular, in the case where the above-described peeling process has been performed, the liner 2 can be fixed while maintaining the sealing property between the outer surface of the outer protective layer 23 and the inner surface of the main pipe 11 by this curing step. It becomes possible.

  Finally, the process proceeds to the post-processing step of step S16. In the post-processing step, after cutting off the excess portion of the liner 2 protruding toward the outside on both ends of the main pipe 11, the water stopcock 35 attached in the detaching process is removed, and the detachable pipe 12 is connected again. Install. Further, when the end portion of the liner 2 is not opened, the end portion is opened in this post-processing step for practical use of the liner 2. Thereby, all the steps of the pipeline bridge rehabilitation method of the present invention are completed.

  In this post-processing step, when the detachable tube 12 is damaged due to deterioration, corrosion or the like, the detachable tube may be replaced with a new one. Thereby, the performance and quality of the detachable pipe as well as the main pipe 11 are improved, and the quality of the entire pipeline bridge 1 is improved.

  Moreover, in this post-processing process, you may perform the pipe opening process which slides with the inner surface of the main pipe 11 using a putty etc. with respect to the both ends of the liner 2 which excised the excess part. Thereby, the both ends of the liner 2 do not hinder the flow of various fluids flowing into the pipeline bridge 1.

  After the completion of all the steps of the present invention, the liner 2 conveys various fluids and the like from the embedded pipe 31 while maintaining the hermeticity between the inner surface of the main pipe 11 and the outer surface of the exterior protective layer 23, thereby allowing the main pipe to 11 Prevents corrosion and deterioration of the inner surface. Furthermore, the inner surface watertight layer 21 enables various fluids flowing from the embedded pipe 31 to flow inside after completion of all the steps of the present invention. Furthermore, when the pipeline bridge 1 is used for laying various cables or the like through the main pipe 11, the inner surface watertight layer 21 is used to insert the cable when the cable is laid in the main pipe 11. It is possible to prevent water from entering the inner watertight layer 21 from the outside of the liner 2.

  After completing the series of steps in this manner, the pipeline bridge 1 can be used again without replacing the main pipe 11. In this case, the liner 2 causes the various fluids flowing in from the buried tubes 31a and 31b to flow in the inner surface watertight layer 21 and further prevents the various fluids from flowing into the inner surface of the main tube 11 and the outer surface of the main tube 11. It is possible to maintain the sealing property between the outer surface of the protective layer 23.

  In particular, in the method for rehabilitating a pipeline bridge to which the present invention is applied, the rehabilitation is completed without cutting and welding of the main pipe 11 constituting the pipeline bridge 1, so that internal corrosion from a welded portion in the main pipe that has occurred in the past has occurred. Therefore, the quality and performance of the pipeline bridge 1 can be maintained over a long period of time. Furthermore, in the present invention, since it is not necessary to introduce the liner 2 into the main pipe 11 through the curved pipe 32 as in the prior art, the liner 2 can be arranged more smoothly. However, the pipe bridge 1 can be rehabilitated while maintaining the strength and quality of the liner 2. Furthermore, in the present invention, it is not necessary to use a manhole or excavate a shaft for cutting the buried pipe 31 in the step of arranging the liner 2, so that the rehabilitation can be performed without causing a traffic obstacle. In addition to being able to do so, the construction process can be reduced, and the construction period and construction costs can be saved.

  Furthermore, by performing the above-described peeling step, the inner surface of the main pipe 11 can be easily sealed with a simple method of peeling off the exterior protective layer 23 on both ends of the main pipe 11. It becomes possible to suppress the progress of corrosion on the inner surface. Furthermore, this can reduce the process of attaching a water stop member, a connecting member, and the like for the pipe opening treatment, reduce the work period required to rehabilitate the pipe bridge 1, and more effectively use the pipe bridge 1. It becomes possible to resume quickly.

  Incidentally, in this embodiment, since only the main pipe 11 of the pipe bridge 1 can be rehabilitated, when the pipe bridge 1 has the branch pipe 16 branched from the main pipe 11, for example, a non-patent document (a foundation) The technology for rehabilitating the branch pipe 16 using the so-called top hat disclosed in the New Sewerage Technology Promotion Organization, “Sewage pipe repair method in situ form-LL method” P44-48) The rehabilitation of the tube may also be performed.

  In addition, when corrosion or pitting corrosion is observed in the main pipe 11 of the pipe bridge 1, the steel pipe 11 is welded from the outer surface of the main pipe 11 to the portion that has been corroded in advance and is reinforced. Thus, the present invention may be applied. Thus, welding is performed from the outer surface of the main pipe, and the inner surface of the main pipe 11 is protected by the liner 2 even if the coating on the inner surface of the main pipe 11 is deteriorated by welding heat.

  The pipeline bridge rehabilitation method to which the present invention is applied is not limited to the above-described embodiment, and the liner 2 is installed using a placement device 41 as described below as a second embodiment of the present invention. It may be arranged in the tube 11.

  The placement device 41 is used when placing the liner 2 along the axial direction in the main pipe 11 in the placement step of Step S12. For example, as shown in FIG. 5A, the arrangement device 41 can move the rod-shaped axle 42 with the wires 33 attached to both ends, and the arrangement device 41 provided on both ends of the axle 42. And a pulley 43.

  In the arrangement step of Step S12, first, the arrangement device 41 to which the wire 33 is attached is inserted from the arrival port 15b to the introduction port 15a through the inside of the main pipe 11. At this time, as for the wire 33, the arrangement | positioning apparatus 41 is attached to one end side, and the winch 34 is attached to the other end side.

  Next, as shown in FIG. 5B, for example, the liner 2 is folded in the longitudinal direction to form a folded portion 46 on the liner 2 so that the liner upper portion 2d is placed on the upper surface of the liner lower portion 2c. To. Then, the axle 42 of the placement device 41 that has been inserted is hooked to the inner surface of the folded portion 46. Thereafter, the winch 34 is operated while the rear end 2b of the liner 2 is held at the introduction port 15a of the main pipe 11, and the arrangement device 41 is pulled toward the arrival port 15b of the main pipe 11 together with the wire 33. Thereby, for example, as shown in FIGS. 5B and 5C, the placement device 41 presses the folded portion 46 from the introduction port 15a toward the reaching port 15b, and the folded portion 46 reaches the reaching port 15b. Thus, the liner 2 is arranged along the axial direction in the main pipe 11. In addition, after arrange | positioning the liner 2 in the main pipe 11 using the arrangement | positioning apparatus 41, the rehabilitation of the pipe bridge 1 is completed by passing through the process similar to the peeling process of step S13 mentioned above.

  Thus, by arranging the liner 2 using the arrangement device 41, the liner upper portion 2 d slides on the upper surface of the liner lower portion 2 c previously arranged, so that the liner 2 is directly rubbed with the main pipe 11. It becomes possible to arrange without making it. This also makes it easier to pull the liner 2 than when pulling the liner 2 directly, and further reduces the elongation of the liner 2 and lengthens the construction extension while ensuring the quality of the liner 2. Is possible.

  When the liner 2 is arranged using the arrangement device 41, the liner 2 can be arranged in the main pipe 11 more easily by applying the above-described lubricant to the liner 2. Further, as described above, a plurality of liners 2 may be folded in the short direction in advance before the liner 2 is folded in the longitudinal direction.

  As a third embodiment of the pipeline bridge rehabilitation method to which the present invention is applied, a tip protective layer 24 and a bag body 25 as described below may be used.

  In the present embodiment, for example, as shown in FIG. 6, the front end 2 a of the liner 2 is opened, and has a shape protruding from the exterior protective layer 23 in which the resin-impregnated layer 22 and the inner surface watertight layer 21 are opened. The As a result, the resin impregnated layer 22a is exposed at the front end 2a of the liner 2. Further, for example, as shown in FIG. 6, a balloon-like bag 25 is inserted into the inner surface watertight layer 21 of the liner 2 and used. Furthermore, a tip protective layer 24 is attached to the outer peripheral surface of the protruding resin-impregnated layer 22. A wire 33 for pulling the liner 2 and a peeling wire for peeling the tip protective layer 24 (not shown) are attached to the tip protective layer 24, and an auxiliary wire 37 is attached to the bag body 25. . These wires 33, peeling wires, and auxiliary wires 37 are inserted from the bent tube 32 through the embedded tube 31 and attached to a winch (not shown). The winch (not shown) may be provided in the buried pipe 31 or may be provided around a manhole connected to the buried pipe 31.

  The tip protective layer 24 is made of the same material as the exterior protective layer 23, and is embodied by a film or fiber such as polyester, polyethylene, polypropylene, polyethylene terephthalate, or the like. The tip protective layer 24 protects the exposed resin-impregnated layer 22a when pulling the front end portion 2a of the liner 2 in the arranging step of Step S12.

  The bag body 25 may be made of any material as long as it is flexible and airtight, and is embodied by, for example, a silicon tube, a polyester reinforced polyethylene tube, a rubber balloon, or the like.

  In the present embodiment, the front end portion 2a of the liner 2 is exposed by pulling a peeling wire (not shown) in the peeling step of Step S13. Next, in the press-fitting process of step S14, the liner 2 is pressure-bonded to the inner surface of the main pipe 11 by press-fitting gas or liquid into the bag body 25. As a result, the resin-impregnated layer 22a exposed at the outer protective layer 23 and the front end 2a of the liner 2 is pressed against the inner surface of the main pipe 11. In the subsequent curing step of step S15, the bag body 25 is made to flow into the resin-impregnated layer 22 by a light irradiation device (not shown) that is preliminarily inserted into the bag 25 or a gas or liquid that is heated inside. The liner 2 is fixed to the inside of the main pipe 11 by irradiating light. After this, the bag body 25 may be removed by pulling the auxiliary wire 37 attached to one end of the bag 25, or the rear end 2b of the liner 2 (not shown) is opened to You may make it remove by pulling directly from.

  In the present embodiment, by performing the above-described operation using the tip protective layer 24, even if the detachable tube 12 is provided only on one end side of the main tube 11, the other end side of the main tube 11. It is possible to easily perform the pipe opening process. That is, when the detachable pipe 12 is not provided on the other end side of the main pipe 11, for example, there is no reaching port 15 b as shown in FIG. 1B, so the front end 2 a of the liner 2 is connected to the outside of the main pipe 11. It cannot be peeled off. However, in the present embodiment, the resin-impregnated layer 22a can be easily exposed from a remote place by a simple operation in which the tip protective layer 24 is simply pulled by a peeling wire in the peeling step. Thereby, in the press-fitting process, the resin impregnated layer 22a can be pressure-bonded to the inner surface of the main pipe 11 also to the other end side of the main pipe 11, and the pipe opening process is easily performed.

  Further, when the detachable pipe 12 is not provided on the other end side of the main pipe 11, in order to apply a sufficient pressure from the inside of the liner 2 in the press-fitting process, not only the inside of the main pipe 11 but also the buried pipe 31 and the curved pipe. It is necessary to press-fit a gas or liquid up to 32. However, by using the bag body 25, it is sufficient to press-fit a gas or liquid only into the bag body 25 in the press-fitting process. Thereby, in the press-fitting process, it is possible to reduce the amount of gas or liquid required to press the liner 2 to the inner surface of the main pipe 11, and consequently reduce construction costs and the like.

  Incidentally, it is needless to say that the bag body 25 used in the present embodiment may be used when the detachable pipe 12 is attached to both ends of the pipe bridge 1. In addition, it goes without saying that the tip protective layer 24 used in the present embodiment may also be used when the detachable pipe 12 is attached to both ends of the pipeline bridge 1 in the same manner.

  Further, as a fourth embodiment of the pipeline bridge rehabilitation method to which the present invention is applied, when there is a branch pipe 16 branched to the main pipe 11, the pipeline bridge 1 can be obtained by using a formwork pipe 51 described later. May be rehabilitated.

  In the present embodiment, for example, as shown in FIG. 7, the formwork tube 51 is inserted into the branch tube 16 branched from the main tube 11. The mold tube 51 is formed in a hollow cylindrical shape having an outer diameter smaller than the inner diameter of the branch tube 16. The formwork tube 51 includes a holding plate 52 attached to one end side 51a of the formwork tube 51, a spacer 53 attached so as to be substantially perpendicular to the outer peripheral surface on the outer periphery of the formwork tube 51, and the formwork tube. 51 and a closing plate 54 fitted on the inner surface of the other end 51b.

  The holding plate 52 has a plate shape and is embodied by a steel plate or the like. The spacer 53 is used to fix the position of the formwork tube 51 after the formwork tube 51 is inserted into the branch tube 16 and is embodied by the same material as the formwork tube 51. Further, the closing plate 54 is embodied by, for example, an FRP plate or the like, and thus, it becomes possible to easily perforate the opening with respect to the closing plate 54.

  The process of the pipeline bridge rehabilitation method in this embodiment is demonstrated. In addition, each process in this embodiment is performed in parallel with the step of step S11-S16 mentioned above.

  First, in the removal step of step S <b> 11, when an attachment valve (not shown) is attached to one end side 16 a of the branch pipe 16, the attachment valve is removed from the branch pipe 16. In the arrangement process of the next step S12, the same operation as the above-described step S12 is performed, and the liner 2 is arranged in the main pipe 11. And in the peeling process of step S13, for example, as shown in FIG. 4B, when the liner 2 is pressure-bonded to the main pipe 11 in addition to the outer protective layer 23 located at both ends of the main pipe 11. The exterior protective layer 23 located around the connection port 17 is peeled off to expose the resin-impregnated layer 22a and the resin-impregnated layer 22b.

  Here, the mold tube 51 is inserted into the branch tube 16 and fixed before the press-fitting step of step S14. Then, in the press-fitting step of step S14, for example, as shown in FIG. 8A, the liner 2 is expanded by press-fitting gas or liquid into the liner 2, and the exterior protective layer 23 and the exposed resin impregnation are obtained. The layer 22a and the resin-impregnated layer 22b are pressed against the inner surface of the main pipe 11. Here, in the press-fitting step, by pressing the pressing plate 52 in the direction in which the mold tube 51 is attached, the position of the mold tube 51 pressed by the liner 2 that expands through the connection port 17 is moved. It becomes possible to hold so that there is no.

  In this press-fitting process, by inserting the closing plate 54 into the mold tube 51, the liner 2 is prevented from expanding through the mold tube 51 on the other end side 51b. That is, when the other end side 51b of the mold tube 51 is fixed near the connection port 17, the liner 2 does not expand into the branch tube 16 in the press-fitting process. Thus, the thickness of the liner 2 positioned around the connection port 17 can be maintained. As a result, the liner 2 can be fixed to the inner surface of the main pipe 11 while maintaining the quality and strength of the liner 2 positioned around the connection port 17. it can.

  Next, the resin-impregnated layer 22 is impregnated into the gap formed between the inner surface of the branch pipe 16 and the outer surface of the mold tube 51 between the press-fitting process of step S14 and the curing process of step S15. For example, as shown in FIG. 8B, a branch pipe resin layer 55 is formed by filling a liquid resin with the same material as the curable resin. In the filling step for forming the branch pipe resin layer 55, the mold tube 51 is used as a mold for forming the branch pipe resin layer 55.

  Then, in the curing process of step S15, the branch pipe resin layer 55 is cured together with the resin impregnated layer 22, thereby fixing the mold tube 51 together with the branch pipe resin layer 55 to the inner surface of the branch pipe 16. In this step, when the branch pipe 16 is short, etc., the branch pipe 16 and the branch pipe resin layer 55 are also heated by the heat conduction of the main pipe 11 heated in the same step and cured together with the liner 2. It will be.

  In the case where a photocurable resin is used, a light irradiation device (not shown) is introduced into the mold tube 51, and light is irradiated to the branch tube resin phase 55 to thereby branch the resin layer 55. To fix. Further, when the branch pipe resin phase 55 is not sufficiently heated, a heating liquid is allowed to flow into the mold tube 51 or a hole is drilled into the liner 2 so as to be connected to the mold tube 51. The heating liquid may be allowed to flow through the port 17. Thereby, even when the branch pipe 16 is extremely long or the environment around the pipe bridge 1 is at a low temperature, the branch pipe resin layer 55 can be sufficiently cured.

  The curable resin for forming the branch pipe resin layer 55 may not be the same as the curable resin impregnated in the resin impregnated layer 22, and is appropriately selected according to the curing conditions in the main curing step. You can do it.

  Finally, in the post-processing step of step S16, in order to put the branch pipe 16 into practical use, for example, as shown in FIG. 8C, a hole is drilled from the one end side 51b in the formwork pipe 51 into the liner 2. The periphery of the connection port 17 is opened. Thereafter, the holding plate 52 is removed, and an air valve (not shown) is attached again to restore the branch pipe 16. At this time, the mold tube 51 may be removed or left. When the branch pipe length is long or when the branch pipe is winding, the construction process can be greatly reduced by leaving it. At this time, a new air valve may be attached depending on the degree of deterioration.

  By performing this series of steps, the pipe bridge 1 is cured without any seam between the two layers in order to cure the branch pipe resin layer 55 and the resin impregnated layer 22 integrally at the same time. The airtightness between the inside 11 and the exterior protective layer 23 is improved. Further, since the main pipe 11 and the branch pipe 16 can be renewed at the same time, the process period can be reduced. Furthermore, since the mold tube 51 is inserted from the outside of the branch pipe 16 and filled with a liquid resin, rehabilitation can be performed without being restricted by the diameter or branch angle of the branch pipe. It becomes.

  In addition, you may make it this formwork pipe | tube 51 include the coupling part which is not shown in figure for attaching instruments, such as an air valve, a pressure gauge, and a thermometer. By using the formwork tube 51 including such a joint portion (not shown), it is possible to use various instruments as they are after the completion of all the processes.

It is a front view for demonstrating the pipeline bridge rehabilitation method to which this invention is applied. It is a figure which shows the specific structural example of a liner. It is a flowchart which shows the process of the pipeline bridge rehabilitation method to which this invention is applied. It is a figure for demonstrating the range which peels an exterior protective layer in a peeling process. It is a figure for demonstrating the other Example of the pipeline bridge rehabilitation method to which this invention is applied. It is a figure for demonstrating the other Example of the pipeline bridge rehabilitation method to which this invention is applied. It is a figure for demonstrating the formwork pipe | tube used in order to rehabilitate a branch pipe. It is a figure for demonstrating the process of renovating a branch pipe using a formwork pipe. It is a figure for demonstrating a prior art.

Explanation of symbols

1 pipeline bridge
2 Liner
11 Main
12 Detachable tube
13 Support part
14 Abutment
15 opening
16 branch pipe
17 Connecting port 21 Internal watertight layer
22 resin impregnated layer 23 exterior protective layer 24 tip protective layer
25 bags
31 buried pipe
32 curved pipes
33 wires
34 winches
35 Water stop cock 37 Auxiliary wire
41 Arrangement device 42 Axle
43 pulley
46 Folding part 51 Formwork tube
52 holding plate
53 Spacer
54 Blocking plate
55 Branch pipe resin layer

Claims (8)

In a pipe bridge rehabilitation method for rehabilitating a pipe bridge having a hollow tubular main pipe and at least a detachable pipe detachable from the main pipe attached to one end side of the main pipe,
A removal step of forming an opening on one end side of the main pipe by removing the detachable pipe,
A hollow cylindrical inner surface watertight layer made of an airtight material, a curable resin that is cured by heating or light irradiation is impregnated into the nonwoven fabric, a resin impregnated layer that covers the inner surface watertight layer, and the resin impregnated layer An arrangement step of introducing a flexible cylindrical body having an exterior protective layer from the opening and arranging the flexible cylindrical body along the axial direction of the main pipe,
A press-fitting step of press-fitting the outer protective layer against the inner surface of the main pipe by press-fitting a gas or a liquid into the inner water-tight layer;
A curing step of fixing the flexible cylindrical body to the inner surface of the main pipe by irradiating the resin-impregnated layer with heat or light from within the inner watertight layer and curing the curable resin; I have a,
In the arrangement step, a folded portion is formed by folding the flexible cylindrical body in the longitudinal direction, a rear end portion of the flexible cylindrical body is held on one end side of the main pipe, and the book The flexible tube is disposed by sequentially moving the folded portion along the axial direction of the main tube by pressing the folded portion from the inside toward the other end of the tube. To rehabilitate pipeline bridge. In the above arrangement step, pipe bridges rehabilitation method according to claim 1, wherein the pressing the folded portion of the flexible tubular body is further folded in the transverse direction. In the press-fitting step, the resin-impregnated layer is exposed by previously peeling a part of the exterior protective layer, and the position located around the connection port between the main pipe and the branch pipe branched from the main pipe The pipeline bridge rehabilitation method according to claim 1 or 2 , wherein the exposed resin-impregnated layer is pressure-bonded to the inner surface of the main pipe. Prior to the press-fitting step, a hollow cylindrical form tube having an outer diameter smaller than the inner diameter of the branch pipe is inserted into the branch pipe,
Between the press-fitting step and the curing step, the curable resin is filled in a gap formed between the inner wall of the branch tube and the outer wall of the mold tube to form a branch tube resin layer. And further comprising a filling step,
The pipe bridge rehabilitation method according to claim 3 , wherein, in the curing step, the curable resin constituting the branch pipe resin layer is cured together with the curable resin impregnated in the resin impregnated layer. In a pipe bridge rehabilitation method for rehabilitating a pipe bridge having a hollow tubular main pipe and at least a detachable pipe detachable from the main pipe attached to one end side of the main pipe,
A removal step of forming an opening on one end side of the main pipe by removing the detachable pipe,
A hollow cylindrical inner surface watertight layer made of an airtight material, a curable resin that is cured by heating or light irradiation is impregnated into the nonwoven fabric, a resin impregnated layer that covers the inner surface watertight layer, and the resin impregnated layer An arrangement step of introducing a flexible cylindrical body having an exterior protective layer from the opening and arranging the flexible cylindrical body along the axial direction of the main pipe,
A press-fitting step of press-fitting the outer protective layer against the inner surface of the main pipe by press-fitting a gas or a liquid into the inner water-tight layer;
A curing step of fixing the flexible cylindrical body to the inner surface of the main pipe by irradiating the resin-impregnated layer with heat or light from within the inner watertight layer and curing the curable resin; I have a,
Prior to the press-fitting step, a hollow cylindrical form tube having an outer diameter smaller than the inner diameter of the branch pipe branched from the main pipe is inserted into the branch pipe,
Between the press-fitting step and the curing step, the curable resin is filled in a gap formed between the inner wall of the branch tube and the outer wall of the mold tube to form a branch tube resin layer. And further comprising a filling step,
In the press-fitting step, the resin-impregnated layer is exposed by peeling a part of the exterior protective layer in advance, and the inner surface of the main pipe located around the connection port between the main pipe and the branch pipe , Press-bond the exposed resin impregnated layer,
In the curing step, the curable resin constituting the branch pipe resin layer is cured together with the curable resin impregnated in the resin impregnated layer . In the arrangement step, the flexible cylindrical body is arranged by pulling the front end portion of the flexible cylindrical body from the opening to the other end side of the main pipe through the inside of the main pipe. The method for rehabilitating a pipeline bridge according to claim 5 . The pipe bridge rehabilitation method according to claim 6 , wherein, in the arranging step, the front end portion of the flexible tubular body folded in a short direction is pulled. Prior to the press-fitting step, the outer protective layer located on one end side and the other end side of the main pipe among the outer protective layers of the arranged flexible cylindrical body is peeled off from the flexible cylindrical body. A peeling step,
The pipe according to any one of claims 1 to 7 , wherein, in the press-fitting step, the resin-impregnated layer covered by the peeled exterior protective layer is pressed against the inner surface of the main pipe. Road bridge rehabilitation method.

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