JP2001262971A - Bore extending method and device for conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the chips of the inner wall material of an existing conduit from scattering to contaminate the circumference or damaging the environment in the work for cutting and extending the inner wall of the conduit. SOLUTION: This method comprises a process (a) for enlarging the inner wall of the existing conduit 16 with a cutting tool 40 while moving the cutting tool from one end of the conduit 16 to the other end thereof and a process (b) for circulating water between the internal space and external space of the conduit 16 by use of pipes 100, 110 or the like in the process (a), and recovering it in a disposal tank 120 or the like by exhausting the chips generated in the internal space of the conduit 16 together with the circulating water from the conduit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for enlarging the inner diameter of a pipeline, and more particularly, to cutting an inner wall of an existing pipeline for repair or the like after constructing a pipeline for electric wiring. The method is intended for a method of enlarging the inner diameter and an apparatus used for this method.

[0002]

2. Description of the Related Art Pipelines buried in the ground may be damaged by external forces such as pressure applied from the ground or groundwater or earthquakes. The lining material such as the concrete forming the inner wall of the pipe and the asbestos applied to the inner wall may deteriorate or deteriorate with time.
When such a problem occurs, leakage of electric power or deterioration of the cable material occurs due to intrusion of groundwater, and cable breakage occurs due to intrusion of earth and sand in the laying conduit of the power cable or the communication cable. Water leaks and water pollution occur in water pipes, and gas leaks occur in gas pipes.

[0003] Therefore, it is possible to completely replace an existing damaged pipeline or to construct a new pipeline, but if only the inner wall portion of the pipeline is repaired, the pipeline can be easily and quickly rehabilitated. Can be. There is no major problem in the repair work in the case of a large-diameter existing pipeline that allows workers to enter inside, but in the case of a small-diameter pipeline in which workers cannot enter, devising work equipment and work methods Is required. A description will be given of a conventionally known repair technique for a small-diameter existing pipeline. A small cutting work vehicle or a cutting robot, which has a cutting drill at the tip and can travel in the pipeline, is sent into the pipeline from the manhole at the end of the pipeline, and the inner wall of the pipeline by a certain thickness Cut and remove to enlarge the inner diameter a little. Thereafter, the inner wall of the pipe is repaired by coating the inner wall of the pipe with a repair material made of a synthetic resin or the like, or covering the inner wall of the pipe with a tubular repair material.

In this method, the inner wall of the existing pipeline is cut and enlarged in advance by an amount corresponding to the increase in the thickness of the repair material.
There is an advantage that the inner diameter of the pipeline after the repair does not become narrower than before the repair, and the function of the pipeline can be maintained in the same manner as before the repair.

[0005]

In the above-described technique for repairing an existing pipeline, there is a problem in processing a material cut from an inner wall of the pipeline. The material of the inner wall of the pipe becomes fine fibrous or powdery cutting chips, and the cutting chips fly into the pipe and the inside of the manhole, and contaminate these wall surfaces. If the inner wall material of the pipeline is asbestos or hard vinyl chloride,
Workers working in the manhole may be injured if sucked. If the cutting chips become fine particles and are discharged from the manhole to the ground, the surrounding environment is also polluted. Furthermore, if cutting chips remain stuck to the inner surface of the pipeline during coating or placement of repair materials,
It also has an adverse effect on the construction of repair materials.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent, when cutting and expanding an inner wall of an existing pipeline, cutting chips of the inner wall material of the pipeline from scattering around and contaminating the environment or damaging the environment. It is to be.

[0007]

A method for enlarging the inner diameter of a pipeline according to the present invention is a method of cutting the inner wall of an existing pipeline to enlarge the inner diameter of the pipeline, wherein the inner diameter of the existing pipeline is expanded from one end to the other end. (A) cutting the inner wall of the existing pipeline with the cutting tool while moving the cutting tool to expand the pipeline inner diameter, and the step (a)
A step of circulating water between the internal space and the external space of the existing pipeline, and discharging and collecting cutting chips generated in the internal space of the existing pipeline from the existing pipeline together with the circulating water.
(b). [Existing pipelines] Applicable to pipelines in ordinary civil engineering construction structures. For example, pipes for power transmission cables or communication cables buried underground in urban areas, gas pipes, sewer pipes, and the like can be mentioned. Even if it is not underground, it can also be applied to pipes provided on the walls, floors, ceilings, etc. of buildings.

[0008] As a material forming the pipe, concrete, fume pipe, synthetic resin pipe and the like can be mentioned. The present invention can be applied to a pipeline in which a lining layer made of a synthetic resin such as hard vinyl chloride or asbestos is laminated on the inner wall of the pipeline. The diameter of the pipe is not particularly limited, but is preferably applied to a pipe having a relatively small diameter. Specifically, caliber 100-
Applicable to the range of 700mmφ, caliber 100-150mmφ
Is particularly preferred. The conduit is usually applied to a straight one, but can also be applied to one having a curved portion.

[Cutting of Pipe Line] If the inner wall of the pipe line can be cut to enlarge the inner diameter of the pipe line, the same apparatus and process as those used in the ordinary cutting technique in the field of civil engineering and construction can be adopted. In order to cut the inner wall of the conduit to increase the inner diameter of the conduit, a cutting means which can perform a cutting operation while being inserted into the conduit and is movable from one end to the other end of the conduit is used. As the cutting tool, a cutting tool for drilling holes in ordinary civil engineering can be used. Although it depends on the material of the conduit, any tool that can cut the inner wall of the conduit to a desired diameter may be used. Cutting blades made of tool steel, ceramic, or the like can be arranged corresponding to the cutting diameter. Specifically, a drill tool, a reamer tool, a grinding tool, or the like can be employed.

[0010] These cutting tools can be mounted on a small work vehicle or a robot that runs in a pipeline. In addition, a cutting tool can be attached to the tip of or in the middle of the support shaft inserted into the conduit, and the cutting tool can be moved together with the support shaft. If the support shaft can be connected and disassembled,
The support shaft can be extended or disassembled as the operation progresses. In the cutting operation, the material of the inner wall of the pipe is removed by cutting to generate cutting chips. The cutting chips are in the form of fine powder or granules or in the form of fibers. The cutting waste may be a single material or a mixture of a plurality of materials. For example, when the inner wall of the pipeline is lined, there are cases where only the lining material is cut or where the material of the main body on the outer periphery of the lining is also cut depending on the amount of increase in the inner diameter of the pipeline.

[Circulation of water] Water is fed into the internal space of the pipeline, and the cutting waste generated in the cutting operation is captured by the water, transferred together with the water, discharged to the external space of the pipeline, and cut off in the external space. Collect. The water separated from the cuttings is sent back into the internal space of the pipeline. As the water, ordinary industrial water can be used. A lubricant or cutting fluid that facilitates the cutting process may be mixed in the circulating water. By circulating water between the internal space and the external space of the pipeline, the amount of water used can be reduced, and a large amount of wastewater is not released together with the cutting waste.

The end of the pipeline can be closed to prevent circulating water from leaking to the surroundings. Specifically, an obstruction plug made of rubber, synthetic resin, metal, wood material, or the like may be attached to the end of the pipe. The plug is fitted, screwed,
It can be fixed to the pipe by various fastening means such as screws. A cutting tool moving in the conduit can also block the conduit and act as an obturator. When the cutting tool is supported by the support shaft or when there is a cable or the like for controlling the cutting work vehicle, an insertion hole can be provided at a position where the support shaft or the cable penetrates in the plug.

[0013] The obstruction plug can be provided with a discharge port for discharging circulating water. A supply port for circulating water may be provided in the obturator plug. Supply of circulating water to the pipeline
This can be done from the cutting tool part. If a flow path such as a pipe or a hose from the outside of the pipe to the cutting tool is provided, and circulating water is jetted into the pipe from between the cutting blades of the cutting tool or from an outlet provided at the tip of the cutting blade, The generated chips can be immediately captured by the circulating water. The plugs may be provided at both ends of the conduit, or may be provided at only one end and the other end may be left open. At the other open end,
A drainage tank for receiving the circulating water discharged from the pipeline can be provided. The drainage basin can be provided in a manhole outside the conduit adjacent to the end of the conduit. Water can be circulated between the drainage tank and the internal space of the pipeline. Separately from the drainage tank provided adjacent to the end of the pipeline, a large-capacity circulating water tank is provided in a large space such as the ground surface, and water is transferred from the drainage tank to the internal space of the pipeline through the circulating water tank. It can also be circulated.

[Recovery of Cutting Chips] Cutting chips can be separated and collected from circulating water containing cutting chips discharged into the external space of the pipeline. In order to separate cutting chips from circulating water, various filter devices and solid-liquid separation devices can be used. By leaving the circulating water to stand still, cutting chips can be precipitated and separated. A treatment tank can be installed in the external space of the pipeline for separating chips and storing circulating water. The treatment tank can be provided with a separation mechanism for cutting chips such as a filter and a sedimentation tank. The processing tank and the internal space of the pipeline can be connected by a fluid passage such as various pipes and hoses. In the middle of these pipes, pumps are provided as necessary.

The cutting chips separated from the circulating water are appropriately disposed of. If a vacuum truck is used for transportation to the landfill site, it is possible to prevent cutting chips from scattering to the outside. It is also possible to discard the cutting chips after solidifying them by compressing, dehydrating, or adding a hardener. [Supporting shaft and rotary traction device] The pipe cutting step can be performed by the following method using a combination of the support shaft and the rotary traction device. Step (a-1): The support shafts are sequentially connected in the axial direction, and inserted from one end to the other end of the existing pipeline.

Step (a-2): A cutting tool whose cutting diameter is larger than the inner diameter of the existing pipeline is mounted on the support shaft outside the one end of the existing pipeline. Step (a-3): The supporting shaft is gripped by a rotary pulling device installed outside the other end of the existing pipeline, and the inside of the existing pipeline is pulled while the cutting tool is rotated together with the supporting shaft to perform cutting. The inner wall of the existing pipeline is cut with a tool to increase the pipeline inner diameter. A specific example of such a cutting method is disclosed in the specification and drawings of Japanese Patent Application No. 11-283183, which was previously filed by the applicant of the present patent application. In the above method, the circulation of the circulating water and the discharge and collection of the cutting chips can be performed by the following method.

Obstruction plugs are arranged at both ends of the existing pipeline to close the existing pipeline, and the obstruction plug on the side closer to the rotary traction device is rotatably inserted through the support shaft and provided with an outlet for circulating water. In advance, circulating water is ejected from the external space of the existing pipeline to the internal space of the existing pipeline through the flow path communicating with the support shaft and the cutting tool, and the circulating water is discharged together with the cutting waste from the outlet of the plug. Discharge to outside space of existing pipeline. <Supporting shaft> A shaft made of various structural members that can be inserted into existing pipelines, can transmit traction force and rotational force to the cutting tool, and has strength or rigidity to withstand resistance and reaction force during cutting. Materials are used. Specifically, a metal such as steel or aluminum or a fiber-reinforced resin is used. A solid shaft or hollow tube may be used, and may have a circular cross section or other irregular cross section.

The supporting shaft can be connected in the axial direction.
As the connection mechanism, a connection mechanism of a shaft material in a normal mechanical device or a building member can be adopted. In order to facilitate the operation of the support shaft by the rotary traction device, it is preferable that the connecting mechanism does not protrude from the outer peripheral surface of the support shaft.
For example, male and female screws may be provided at the shaft end, or a coupling mechanism by fitting or engaging may be provided. A part or the whole of the support shaft can be made of a flexible material or structure. Specifically, flexibility can be imparted using a spirally wound steel material, an elastic resin material, or the like. The support shaft with excellent flexibility
The present invention can be applied to a pipe having a curved portion.

Even if rigid support shafts made of metal or the like having low flexibility are connected by a flexible joint such as a universal joint which is flexible and can also transmit a rotational force and an axial force, a curve can be obtained. It can correspond to a part. By forming the support shaft with a hollow tube or forming a passage inside the support shaft, a flow path of circulating water can be provided inside the support shaft. The flow path of the circulating water provided on the support shaft and the outlet of the circulating water provided on the cutting tool can be communicated. <Rotary traction device> A rotary tool and a traction force necessary for cutting an inner wall of a pipeline are supplied to a cutting tool mounted on a support shaft.

Since the rotary traction device may be installed outside the pipeline, the external shape and installation space are not so limited.
Normally, it is sufficient if it can be installed in a manhole or the like where the pipe end is open. There is provided a gripping structure for gripping an intermediate portion of the support shaft and supplying a rotational force and a traction force. For example, a hollow chuck mechanism capable of switching between holding and releasing the holding of the support shaft may be rotatably provided by a motor or the like, and may be provided to be movable back and forth by a hydraulic cylinder or the like. As the rotary traction device, a horizontal drilling device, a horizontal boring device, or the like, which is conventionally used for ground investigation or injection of a chemical solution for ground improvement, can be used. As the rotational force, the traction force, the rigidity, and the like, those having a sufficient capacity or capacity suitable for the required cutting performance are used.

[Repair of Pipe Inner Wall] A lining layer made of a synthetic resin, an inorganic material or the like can be formed on the pipe inner wall having an enlarged inner diameter for repair. For example, it is possible to form a lining layer on an inner wall by running a means for applying a lining agent in a pipe. If the coating means is mounted on the support shaft at a position behind the cutting tool during towing, the cutting step and the coating step can be performed continuously.
A lining material such as a synthetic resin film, sheet, or tube can be attached to the inner wall of the conduit. When an ultraviolet curable material is used as these materials, it can be fixed to the inner wall of the conduit by disposing it on the inner wall of the conduit and then irradiating with ultraviolet light to cure.

A method in which a lining material made of a flexible tube material is fed into a pipe in a state where the lining material is turned upside down, and pressurized air is blown from the end of the tube material to re-invert the tube material so as to adhere to the inner wall of the pipe. Can be adopted. Again, if you use UV curable tubing,
The tube material supplied to the inner wall of the conduit can be cured by ultraviolet light and fixed to the inner wall of the conduit.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a method and an apparatus for enlarging the inner diameter of a conduit in a conduit for a power transmission cable buried in the ground. [Structure of Pipe Line] A concrete pipe block 14 is constructed between manholes 10 and 12 installed underground. The sectional shape of the sewer block 14 is rectangular, and a plurality of conduits 16 are formed through the rectangular cross section in front, rear, left and right. A power transmission cable, a communication cable, and the like are inserted into the conduit 16 for use. However, the state shown in the figure shows a state in which the power transmission cable and the like have been removed for repair of the pipeline. A lining layer 17 of asbestos is formed on the inner wall of the conduit 16. This lining layer 1
7, the power transmission cable is protected.

When a certain period of time has elapsed since the construction of the sewer block 14, the asbestos and concrete of the lining layer 17 are deteriorated, and the lining layer 17 is damaged, such as being deformed or missing. Therefore, repair of the pipeline 16 is required. [Rotary traction device] Manhole 10 at one end of conduit 16
Then, the rotary traction device 20 mounted on the gantry 26 is installed. The rotary traction device 20 includes a chuck mechanism for gripping and releasing gripping of the shaft. The chuck mechanism performs a reciprocating operation back and forth and a rotating operation. By alternately repeating the reciprocating operation of the chuck mechanism and the operations of gripping and releasing, the shaft member can be pushed or pulled.

The circulating water supply pipe 100 is connected to the rotary traction device 20. The circulating water supplied from the supply pipe 100 to the rotary traction device 20 is supplied to the end of the shaft held by the rotary traction device 20. If the shaft is a hollow tube, circulating water is fed into the shaft. The center line of the chuck mechanism of the rotary traction device 20 is disposed on an extension of the center line of the conduit 16 for cutting the inner wall. [Support Shaft and Cutting Tool] The rotary pulling device 20 grips a support shaft 30 formed of a steel material and having a circular cross section. The support shaft 30 is provided with a male screw and a female screw at both ends, and can sequentially connect the support shafts 30 in the axial direction.

The support shaft 30 is fed into the pipeline 16 by the rotary traction device 20 while sequentially extending and extending the support shaft 30. The tip of the support shaft 30 has the manhole 12 on the opposite side.
If it extends to the end, the cutting tool 40 is attached to the tip of the support shaft 30. As shown in detail in FIG. 2, the cutting tool 40 includes a plurality of cutting blades 42 that are formed in a conical shape and are circumferentially arranged.
Are arranged, and the outer shape of the cutting blade 42, that is, the cutting diameter is set to be substantially larger than the inner diameter of the pipe line 16 and slightly larger than the outer diameter of the lining layer 17.

The cutting tool 40 is provided with a jet port 36 which penetrates the center of the support shaft 30 and communicates with a flow path 36 through which circulating water flows, and which is opened at a gap or a tip of the cutting blade 42. [Cutting work] When the support shaft 30 on which the cutting tool 40 is mounted on the manhole 12 side is pulled in the direction of the rotary traction device 20 while being rotated by the driving of the rotary traction device 20, the cutting tool 40 rotates and the pipeline 16 lining layers 1
7 and the concrete of the sewer block 14 outside thereof are cut with a predetermined cutting diameter, and the inner diameter of the conduit 16 is expanded.

Since the traction force transmitted from the support shaft 30 to the cutting tool 40 always acts along the center line of the pipe 16, the cutting tool 40 may shift or tilt from the center line of the pipe 16 due to cutting resistance or the like. Even if it is attempted, the cutting tool 40 is always returned to the correct position and posture by the correcting action by the traction force from the support shaft 30. This is, for example, the cutting tool 40
When the cutting operation is performed by pushing the cutting tool 40 from behind with the support shaft 30 or the like, if the position of the cutting tool 40 is slightly deviated from the center of the pipe 16, the pushing force of the support shaft 30 In contrast to the effect of further displacing from the center of the path 16, the effect of correcting the position and posture of the cutting tool 40 by the traction force of the support shaft 30 can be understood.

In the rotary traction device 20, the connected support shafts 30 are sequentially pulled out from the conduit 16, and the pulled out support shafts 30 are sequentially disconnected and removed.
As a result, the support shaft 30 does not remain extended rearward, and even in the manhole 10 where space is limited,
The towing operation of the support shaft 30 can be continuously performed. When the cutting tool 40 moves to the end of the conduit 16 and the inner diameter of the entire conduit 16 is increased, the cutting operation is completed. In the above-described cutting operation, cutting chips are generated by cutting the pipeline 16.

[Discharge of Cutting Debris by Circulating Water] As shown in FIG. 1, rubber plugs 130 and 132 are fitted to both ends of the pipe 16 during the cutting operation. Obturation plugs 130, 13
2 has a disk shape. As shown in detail in FIGS. 2 and 3, the obturator plug 132 attached to the side closer to the rotary traction device 20 has a through hole 134 into which the support shaft 30 is rotatably fitted. Further, the plug 132 is provided with a discharge port 136 to which the circulating water discharge pipe 110 is connected. Circulating water is supplied to the rotary traction device 20 from a circulating water supply pipe 100, and
Circulating water is fed through a flow path 36 penetrating into the center of the water. The circulating water is sent from the tip of the support shaft 30 to the cutting tool 40, and is sent from the ejection port 46 of the cutting tool 40 into the pipe 16. The circulating water takes in the cutting waste generated in the cutting operation and flows through the inside of the pipeline 16.

The circulating water containing cutting chips is sent from the outlet 136 of the plug 132 to the discharge pipe 110. As a result, the chips are efficiently discharged without accumulating in the pipe 16. Cutting chips do not adhere to the inner wall of the pipe 16. As shown in FIG. 1, a plurality of pipelines 16 are provided in parallel in the sewer block 14, and one of the pipelines 16 is provided.
When the cutting operation is performed on, the plugs 130 are attached to both ends of the remaining pipeline 16 in advance. In this way, even if there is a crack or a hole in the inner wall of the pipe 16 to which the circulating water is supplied during the cutting operation and the circulating water leaks to the adjacent pipe 16, the leaked circulating water is supplied to the manhole 10. , 12, etc. can be prevented.

[Work at End of Pipe Line] In the state shown in FIG. 1, the plug 16 is also closed at the end on the manhole 12 side of the pipe line 16, but in the state shown in FIG. At the end of the conduit 16 there is a cutting tool 40 and no obturator 130 is attached. That is, at the start of the cutting operation, the cutting tool 40 advances from the manhole 12 side to the inside of the conduit 16. At this time, the cutting tool 40
The end of the pipe line 16 is closed by cutting the cutting hole and the circulating water even if the plug 130 is not provided.
The amount leaking to the two sides is small. At the start of cutting, the amount of generated cutting chips is small.

Then, after the cutting tool 40 has been moved until it completely enters the inside of the pipe line 16, the plug 130 is attached to the end on the manhole 12 side. And leakage of circulating water can be reliably prevented. Near the end of the cutting process, a cutting tool 40
Approach the end of the conduit 16 on the side closer to the rotary traction device 20. At this time, the cutting operation by the cutting tool 40 can be performed up to the end of the pipe line 16 by removing the plug 132. Therefore, during a short distance between the two ends of the conduit 16, there is a possibility that some of the cutting chips and circulating water may leak during the cutting operation. Leakage of swarf and circulating water can be reliably prevented, and cutting swarf can be efficiently discharged together with circulating water.

[Recovery processing of cutting chips] The cutting chips discharged from the pipe 16 together with the circulating water are collected. In FIG.
A processing tank 120 is provided on the ground. Processing tank 120
Has a fixed amount of circulating water stored therein.
Circulating water is sucked up by a supply pump 102 provided at an end of a supply pipe 100 inserted into one side of the pipe, and supplied to the pipe 16 from the supply pipe 100 via the rotary traction device 20, the support shaft 30, and the cutting tool 40. Is done. Of the processing tank 120,
The tip of the discharge pipe 110 is disposed on the side separated by the filter 122 from the side on which the supply pipe 100 is disposed. The discharge pipe 110 is connected to the suction pump 1 provided on the way.
At 12, the circulating water and cutting chips in the pipe line 16 are sucked out.
It is sent into the processing tank 120. The cuttings in the circulating water sent into the processing tank 120 settle in the processing tank 120 to become a precipitate B. The circulating water that is the supernatant of the precipitate B
After being filtered at 22, it is sent to the supply pipe 100.

Precipitate B of cutting waste accumulated in the processing tank 120
Are periodically taken out of the processing tank 120 and subjected to appropriate disposal. If the hose 142 of the vacuum car 140 is connected to the treatment tank 120 and the precipitate B is sucked and transferred,
When transported to a waste treatment plant or waste disposal site, the sediment B
It can be handled efficiently without polluting the surrounding environment. [Use of Drainage Receiving Tank] In the embodiment shown in FIG. 4, one end of the conduit 16 is opened and a drainage receiving tank 150 is used.

The end of the conduit 16 on the side of the manhole 10 where the rotary traction device 20 is installed is open without a plug. An obstruction plug 1 is provided at the opposite end of the conduit 16.
30 is attached. Therefore, the cutting tool 40
When the circulating water is fed into the flow path 36 of the support shaft 30 while cutting the conduit 16 with the circulating water, the circulating water ejected into the conduit 16 from the ejection port 46 of the cutting tool 40 carries cutting chips, and Flows towards the open end of the. A drainage tank 15 is provided below the pipeline 16 on the side wall of the manhole 120 where the pipeline 16 opens.
0 is set. The circulating water including the cutting chips flowing to the open end of the pipe 16, that is, drainage flows down to the drainage receiving tank 150.

The end of the discharge pipe 110 is disposed in the drainage tank 150, and the wastewater collected in the drainage tank 150 is sent from the discharge pipe 110 to the treatment tank 120 on the ground. In the above embodiment, there is no obstruction plug at the end of the conduit 16 on the side where the support shaft 30 penetrates.
There is no need to provide a structure that allows the 0 to rotate freely and penetrate so that drainage does not leak. Even if a joint structure such as a connecting sleeve protrudes from the outer periphery of the support shaft 30, it does not catch on the obstruction plug. [Repair process of pipeline] If only the inner diameter of the pipeline 16 is enlarged, the power transmission cable can be inserted and used after the completion of the above-described cutting process.

Further, the inner wall of the conduit 16 can be repaired with a lining layer of a synthetic resin. As shown in FIG. 5, the repair tube 60 is inserted into the conduit 16 whose inner diameter is enlarged. The repair tube 60 is a laminated tube of an ultraviolet curable resin layer 62 and a protective film 64. However, in the preparation state of the repair tube 60, the ultraviolet curable resin layer 62
The protection film 64 is arranged on the outside with. When the repair tube 60 is inserted into the conduit 16, the repair tube 60 is turned over from the end and fed into the conduit 16 while the ultraviolet curable resin layer 62 is arranged outside.

More specifically, when the end of the repair tube 60 is inverted near the end of the conduit 16 and pressurized air is sent into the inside of the inverted repair tube 60, the repair tube is pushed by the compressed air. The reversal portion of 60 naturally expands, and the repair tube 60 extends deep into the conduit 16. The ultraviolet curable resin layer 62 is disposed on the inner wall of the conduit 16 in close contact therewith. After the repair tube 60 is disposed over the entire length of the conduit 16, the repair tube 60
The ultraviolet irradiation lamp 70 is inserted into the inside. UV irradiation lamp 7
0 is supplied with power by a cable 72. When ultraviolet rays are irradiated from the ultraviolet irradiation lamp 70, the ultraviolet curable resin layer 62 of the repair tube 60 is cured and integrated with the inner wall of the conduit 16.

After the curing of the UV-curable resin layer 62 is completed over the entire length of the conduit 16, the UV-curable resin layer 6
When the protective film 64 disposed inside the pipe 2 is peeled off, the repair work on the inner wall of the conduit 16 is completed. As a result, the inner wall of the conduit 16 is protected by the lining layer made of the cured product of the ultraviolet curable resin layer 62 instead of the lining layer 17 that has protected the inner wall of the conduit 16 before performing the operation of increasing the inner diameter. Will be done. The inner diameter after the repair with the ultraviolet curable resin layer 62 may be the same as the inner diameter of the lining layer 17, or may be larger or smaller as long as the purpose of use is not impaired.

[0041]

According to the method and apparatus for enlarging the inner diameter of a pipeline according to the present invention, while performing the operation of enlarging the inner diameter of the pipeline by cutting the inner wall of the pipeline while moving a cutting tool in the pipeline, The chips generated during the cutting operation are discharged and collected together with the circulating water that circulates between the internal space and the external space of the pipeline. The problem that dust is scattered and pollutes the working environment can be solved. Since the circulating water can be used repeatedly, there is no environmental pollution due to wastewater and the amount of water used is small.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a construction state showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a cross-sectional view of an obstruction plug.

FIG. 4 is a sectional view of a construction state showing another embodiment.

FIG. 5 is a schematic sectional view illustrating a repair process.

[Explanation of symbols]

 10, 12 Manhole 14 Sewer block 16 Pipe line 17 Lining layer 20 Rotary traction device 30 Support shaft 40 Cutting tool 100 Supply pipe 110 Drain pipe 120 Processing tank 130, 132 Closure plug 150 Drainage receiving tank

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Keisuke Tani 2-3-141 Honjo Higashi, Kita-ku, Osaka-shi Kinden Co., Ltd. (72) Eiji Morinaga 1-3-3 Morikita-cho, Higashinada-ku, Kobe-shi (72) Inventor Hiromi Inoshi 1-4-20-404, Morikita-cho, Higashinada-ku, Kobe-shi

Claims (6)

[Claims] 1. A method of cutting an inner wall of an existing pipeline by expanding an inner diameter of the pipeline, wherein the inner wall of the existing pipeline is moved by a cutting tool while moving the cutting tool from one end to the other end of the existing pipeline. (A) to increase the inner diameter of the pipeline by cutting the water, in the step (a), circulating water between the internal space and the external space of the existing pipeline, the internal space of the existing pipeline (B) discharging and removing the cuttings generated in step (a) together with the circulating water from the existing pipeline, and collecting the same. 2. In the step (b), one end of the existing pipeline is closed, and water supplied to the internal space of the existing pipeline is disposed adjacent to the other end that is not closed. The method according to claim 1, wherein the pipe is received in a drainage tank and transferred from the drainage tank to an external space. 3. The step (b), wherein both ends of the existing pipeline are closed, and water is circulated between the closed internal space of the existing pipeline and the external space of the existing pipeline. 2. The method for enlarging the inner diameter of a pipeline according to 1. 4. The method according to claim 1, wherein the step (a) comprises: sequentially connecting the support shafts in the axial direction, and inserting and inserting from one end to the other end of the existing pipeline; Attaching a cutting tool whose cutting diameter is larger than the inner diameter of the existing pipeline to the support shaft outside the pipeline (a-2)
And gripping the support shaft with a rotary pulling device installed outside the other end of the existing pipeline, pulling the existing pipeline while rotating the cutting tool together with the support shaft, and cutting the existing pipeline with the cutting tool. (A-3) cutting the inner wall of the pipe to increase the inner diameter of the pipe, wherein the step (b) closes the existing pipe by disposing plugging plugs at both ends of the existing pipe, The support shaft is rotatably inserted into the obstruction plug on the side close to the rotary traction device and a discharge port for circulating water is provided, and the circulating water is passed from the external space of the existing pipeline to the cutting tool via the support shaft. 4. The inner diameter of the pipeline according to claim 3, wherein the inner diameter of the pipeline is ejected through the communicating flow path into the interior space of the existing pipeline, and circulating water is discharged together with the cutting chips from the outlet of the plug to the exterior space of the existing pipeline. Expansion method. 5. The method according to claim 1, wherein the step (b) includes circulating water between a treatment tank provided in an external space of the existing pipeline and an internal space of the existing pipeline. The method according to any one of claims 1 to 4, further comprising a step (c) of separating circulating water into the internal space of the existing pipeline and recovering the swarf. Method. 6. An apparatus for cutting an inner wall of an existing pipeline to enlarge the inner diameter of the pipeline, which is axially connectable, inserted into the existing pipeline, and has a flow path of circulating water therein. A support shaft, a cutting tool mounted on the support shaft, having a cutting diameter larger than the inner diameter of the existing pipeline, and having a jet of circulating water communicating with the flow path of the support shaft; A rotary pulling device that is installed at the middle of the support shaft, and pulls and rotates in the axial direction while gripping the middle of the support shaft; an obturator plug that closes both ends of the existing pipeline; An insertion hole that is inserted as possible, a treatment tank that is arranged in an external space of the existing pipeline and separates and collects cutting chips contained in circulating water, and connects the treatment tank and a flow path of the support shaft. A circulating water supply pipe, and a circulating water outlet provided in the plug having the insertion hole and the front. Pipe inner diameter larger apparatus and a feed water discharge pipe connecting the processing tank.