JP3561449B2 - Method and apparatus for enlarging cutting of existing pipeline - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and apparatus for cutting and expanding an existing pipeline, specifically, after constructing a pipeline for electric wiring and the like, a method of cutting and expanding an inner wall of an existing pipeline for repair or the like, It is intended for devices used in this method.
[0002]
[Prior art]
Pipelines buried underground may be damaged by external forces such as pressure 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.
[0003]
In such a case, the existing pipeline can be completely replaced or a new pipeline can be constructed, but if only the inner wall of the pipeline is repaired, the pipeline can be easily and quickly rehabilitated. .
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, the work equipment and work method are devised. Is required.
[0004]
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 that has a cutting drill at the tip and can travel in the pipeline is sent into the pipeline from the manhole etc. 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 pipeline is repaired by coating the inner wall of the pipeline with a repair material made of synthetic resin or the like, or covering the inner wall of the pipeline with a tubular repair material.
[0005]
In this method, the inner wall of the existing pipeline is cut and enlarged in advance as much as the thickness of the repair material increases, so the inner diameter of the pipeline after repair does not become narrower than before repair, There is an advantage that the function can be maintained as before the repair.
[0006]
[Problems to be solved by the invention]
In the existing pipe repair technique as described above, when cutting and removing the inner wall of the existing pipe, the cutting diameter is eccentric with respect to the center of the pipe, and a part of the circumference of the existing pipe is deep. There has been a problem that cutting is performed too much and another part cannot be cut to a required depth.
[0007]
BACKGROUND ART A cutting work vehicle that performs a cutting operation in a pipeline is made relatively small and lightweight in order to be able to move in a narrow pipeline. Therefore, the reaction force generated when cutting the inner wall of the pipeline easily shifts the position and posture of the cutting tool, and the cutting work vehicle is easily inclined. If there are irregularities on the bottom surface of the pipeline in which the cutting work vehicle travels, the positions of the cutting work vehicle and the cutting tool also change. As a result, the cutting position, that is, the center of the cutting diameter tends to be eccentric with respect to the center of the pipeline.
[0008]
Another problem is that the cutting efficiency is low, the working time is long, and the cutting is difficult depending on the material of the pipe inner wall. This is because the motor that is the driving source of the cutting tool is mounted on the cutting work vehicle, so that only a relatively small-sized and low-performance motor can be used. If the performance of the cutting tool is low, the resistance at the time of cutting increases, and the above-mentioned eccentricity also increases.
[0009]
An object of the present invention is to perform an operation of cutting an inner wall of an existing pipeline by enlarging the same so that the cutting diameter can be reliably maintained concentrically with respect to the center of the pipeline and can be performed efficiently. .
[0010]
[Means for Solving the Problems]
The method for enlarging and cutting an existing pipeline according to the present invention is a method for cutting the inner wall of the existing pipeline to enlarge the inner diameter of the pipeline, and sequentially connecting the support shafts in the axial direction, thereby forming one end of the existing pipeline. Step (a) of inserting and disposing from the end of the existing pipeline to the other end, and mounting a cutting tool having a cutting diameter larger than the inner diameter of the existing pipeline on the support shaft outside the one end of the existing pipeline Along with the support shaft, it has a disc shape with a hole concentric with the support shaft, has a plurality of protrusions projecting outward in the radial direction, and has a peripheral shape in which the tips of the protrusions can slide along the inner wall of the existing pipeline. A plurality of centering tools are attached to the support shaft on the pipe line center side with respect to the cutting tool at a plurality of positions at intervals between the cutting tool and each other in the axial direction of the support shaft. Step (b), gripping the support shaft with a rotary traction device installed outside the other end of the existing pipeline, and a cutting tool together with the support shaft And multiple alignment tools (C) pulling the inside of the existing pipeline while rotating the pipe and cutting the inner wall of the existing pipeline with a cutting tool to enlarge the inside diameter of the pipeline.
[0011]
(Existing pipeline)
Applicable to pipelines in ordinary civil engineering construction structures. For example, there are a conduit for a transmission cable buried underground in an urban area, a gas pipe, a sewer pipe, and the like. It can be applied not only to underground but also to pipes provided on the walls, floors, ceilings, etc. of buildings.
Examples of the material constituting the conduit include concrete, fume pipes, synthetic resin pipes, and the like. The present invention can also be applied to a pipeline in which a lining layer such as a synthetic resin or asbestos is laminated on the inner wall of the pipeline.
[0012]
The diameter of the pipe is not particularly limited, but is preferably applied to a pipe having a relatively small diameter. Specifically, it is applied to a diameter range of 100 to 700 mmφ, and a diameter of 100 to 150 mmφ is particularly preferable.
The pipe is generally applied to a straight pipe, but can also be applied to a pipe having a curved portion.
[0013]
(Support shaft)
Shaft materials consisting of various structural members are used as long as they can be inserted into existing pipelines, transmit traction and rotational forces to cutting tools, and have strength or rigidity that can withstand resistance and reaction force during cutting. . 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.
[0014]
The support 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.
[0015]
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 having excellent flexibility can be applied to a pipe having a curved portion.
Even rigid support shafts made of poorly flexible metal, etc., can respond to curved parts if they are connected by flexible joints such as universal joints that can transmit rotational and axial forces. Can be done.
[0016]
〔Cutting tools〕
A cutting tool for drilling holes in ordinary building 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 are arranged corresponding to the cutting diameter. Specifically, a drill tool, a reamer tool, a grinding tool, or the like is employed.
[0017]
The cutting tool is attached to the end or the middle of the support shaft. It is preferable to be detachable from the support shaft. As a mounting mechanism of the cutting tool to the support shaft, a mounting mechanism similar to a normal cutting tool, such as a key, a cotter pin, and a set screw, is employed.
(Rotary traction device)
The cutting tool mounted on the support shaft is supplied with a rotational force and a traction force necessary for cutting the inner wall of the pipeline.
[0018]
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.
A gripping structure is provided to grip the middle of the support shaft and supply rotational force and traction force. For example, a hollow chuck mechanism capable of switching between holding and releasing of the support shaft can be rotatably provided by a motor or the like, and can be provided to be movable back and forth by a hydraulic cylinder or the like.
[0019]
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 sufficient capacity or capacity suitable for required cutting performance are used.
(Core alignment tool)
The support shaft inserted into the conduit and the center of the cutting tool for cutting the inner wall of the conduit are aligned with the center of the conduit.
[0020]
As the material of the centering tool, various structural materials can be used as long as the material has strength and rigidity enough to position the support shaft and the cutting tool. Specifically, metals such as steel and aluminum, synthetic resins such as nylon and hard vinyl, and ceramics are used. The outer peripheral surface of the centering device can be made of a slippery material or a low friction material.
[0021]
As the centering tool, a tool having a disc shape with a hole corresponding to the outer shape of the support shaft and the inner shape of the pipe can be used.
The outer peripheral shape of the centering device has an outer diameter that is the same as or slightly smaller than the inner diameter of the conduit so that it can slide on the inner wall of the conduit and slide in the axial direction. The entire outer periphery of the alignment tool may abut the inner wall of the pipeline, but if the center of the alignment tool can be aligned with the center of the pipeline, only a part of the circumference will abut the inner wall of the pipeline But it doesn't matter.
[0022]
As the structure of the centering tool, a cylindrical inner peripheral shape inserted into the support shaft, a plurality of protrusions projecting outward in the radial direction, and an outer peripheral shape in which the tip of the protrusion forms a part of the cylindrical shape. Can be used.
As a mechanism for mounting the alignment tool on the outer periphery of the support shaft, a mechanism for attaching various members to a normal shaft body can be adopted.
[0023]
In order to removably attach the centering device in the middle of the support shaft driven by the rotary traction device, the centering device can be detachably mounted on the outer periphery of the support shaft from the side. In the case of a board-shaped alignment tool, it can be divided into left and right parts, and can be attached to the support shaft so that the left and right members are joined together.
The centering tool is mounted at least near the cutting tool on the support shaft, and aligns the center of the cutting tool with the center of the pipe. It is preferable to provide a centering tool on the support shaft on which the cutting tool advances during the cutting operation.
[0024]
In order to securely attach the centering tool to a predetermined position on the support shaft, a fixing tool such as a fixing sleeve or metal fitting can be combined with the main body of the centering tool. In this case, the main body of the centering device has only the function of accurately aligning the center of the conduit with the center of the centering device, that is, the center of the support shaft, and the fixing device performs positioning or fixing of the main body.
[0025]
By mounting the centering device at two places with at least an interval with respect to the support shaft, the support shaft between the pair of centering devices can be reliably centered on the center axis of the conduit. .
When the entire length of the conduit is short, a centering tool may be provided only near the cutting tool. When the entire length of the conduit is long, it is preferable to arrange the alignment tool at predetermined intervals also on the support shaft at a position apart from the cutting tool.
[0026]
(Arrangement process of support shaft)
The support shafts are sequentially connected in the axial direction, and inserted and arranged from one end to the other end of the existing pipeline. The operation of connecting the support shaft and the operation of feeding the tip of the connected support shaft into the conduit are repeated outside the conduit at one end of the conduit. If the above-mentioned rotary traction device is used, the operation of connecting a new support shaft to the rear end while holding the support shaft and the operation of feeding the connected support shaft into the front pipe by the rotary traction device are continuously performed. The support shaft can be efficiently inserted and arranged in the conduit by repeatedly performing the above operation.
[0027]
When the support shaft is fed into the pipeline, a centering tool can be attached to the support shaft at appropriate intervals. If the centering tool is attached, the support shaft can be fed into Sooms along the center of the pipeline.
[Mounting process of cutting tool]
After the support shaft is arranged from one end to the other end of the existing pipeline, the cutting tool is mounted on the support shaft outside the one end of the existing pipeline.
[0028]
Since the cutting tool is larger than the inside diameter of the pipeline, it is attached to a support shaft extending to the outside of the pipeline.
At this time, the centering tool can be attached to the support shaft in the vicinity of the cutting tool before or after the attachment of the cutting tool. In this case, since the centering tool can be attached from the open end of the support shaft, there is no need to dispose the centering tool in a left-right disassembled structure or to attach the centering tool from the side of the support shaft.
[0029]
[Cutting process]
The side of the support shaft opposite to the end on which the cutting tool is mounted is gripped by a rotary traction device installed outside the pipeline. When the support shaft is inserted into the conduit by the rotary traction device, the support shaft is already gripped by the rotary traction device.
In this state, the rotary traction device is operated, the cutting tool is rotated together with the support shaft, and the inside of the existing pipeline is pulled toward the rotary traction device while rotating the cutting tool. Expanding.
[0030]
By adjusting the rotation speed and the towing speed of the cutting tool, appropriate cutting conditions can be set.
The rotary traction device is capable of accurately traction a cutting tool mounted on a support shaft having sufficient rigidity or deformation resistance along a center direction of a pipeline. It is possible to prevent the cutting tool from being inclined or eccentric due to the cutting reaction force.
[0031]
In particular, if the centering tool is attached to the support shaft, the center of the support shaft and the cutting tool and the center of the pipe are accurately positioned by the centering tool. When a centering tool is used, it is possible to reliably center the center of the pipe with the center of the support shaft even if a flexible support shaft is used or the curved portion of the pipe is used.
At the stage where one support shaft of the plurality of connected support shafts is sent to the rear of the rotary traction device, if the connection of the support shaft is released and collected, the support shaft is connected to the rear of the rotary traction device. The support shaft does not stay long.
[0032]
If the gripping means of the support shaft such as a chuck mechanism provided in the rotary pulling device cannot be pulled when there is a protrusion on the outer periphery of the support shaft, the centering tool attached to the support shaft is pulled out of the pipeline. It is preferable to remove the support shaft from the support before the support shaft reaches the gripping means.
When the inner wall of the pipe is cut with a cutting tool, lumps or powdery cutting chips are generated. If a means for removing the cutting chips is provided, the cutting operation can be easily performed. As a means for removing cutting chips, a vacuum suction mechanism can be adopted. For example, if the suction port of the vacuum suction device is arranged at the end of the pipeline, the cutting chips accumulated in the pipeline can be removed by suction. A vacuum suction pipe can be installed along the center or outer periphery of the support shaft to the position of the cutting tool. Water, cutting fluid, and the like can be circulated in the pipeline, and the cutting chips can be washed away together with the liquid. A member for removing cutting chips by a rotating brush or the like can be provided near the cutting tool.
[0033]
(Repair of pipe inner wall)
A lining layer made of a synthetic resin, an inorganic material, or the like can be formed and repaired on the inner wall of the conduit having an enlarged inner diameter.
For example, it is possible to form a lining layer on the inner wall by running means for applying a lining agent in the pipeline. If the coating means is mounted on a support shaft at a position behind the cutting tool during towing, the cutting step and the coating step can be performed continuously.
[0034]
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 can be adopted 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 an end of the tube material so that the tube material is turned again and brought into close contact with the inner wall of the pipe. Also in this case, if an ultraviolet curable tube material is used, 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.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment shown in FIGS. 1 and 2 is a method and an apparatus for cutting and enlarging a pipeline in a conduit for a power transmission cable buried in the ground.
[Pipe structure]
As shown in FIG. 1, a concrete drainage 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 is a state in which the power transmission cable and the like have been removed. A lining layer 17 of asbestos is formed on the inner wall of the conduit 16. The power transmission cable is protected by the lining layer 17.
[0036]
When a certain period of time has elapsed since the construction of the sewer block 14, asbestos and concrete of the lining layer 17 are deteriorated, and damage such as deformation and chipping occurs. Therefore, the pipe 16 needs to be repaired.
[Installation of rotary traction device]
The rotary traction device 20 is installed in the manhole 10 at one end of the conduit 16. The rotary traction device 20 is provided with a hollow chuck 22 at the tip, and has a hollow cylindrical portion 24 behind the hollow chuck 22. The hollow chuck 22 can grip and release the outer periphery of the shaft member with the shaft member inserted in the center. The hollow chuck 22 is driven to rotate by an air motor or a hydraulic motor, and reciprocates back and forth in the axial direction by a hydraulic cylinder or the like.
[0037]
The rotary traction device 20 is fixedly installed in the manhole 10 while being supported by a support member 26 composed of a scaffolding pipe or the like. The center lines of the hollow chuck 22 and the cylindrical portion 24 are arranged on an extension of the center line of the conduit 16 for cutting the inner wall. One end of a vacuum suction pipe 28 is opened near the opening of the pipe 16 to suck and remove dust and the like generated during the cutting operation.
[0038]
[Arrangement of support shaft]
As shown in detail in FIG. 2, the support shaft 30 is formed in a pipe shape having a circular cross section made of a steel material, and a male screw 32 is provided at one end and a female screw 34 is provided at the other end. It can be connected.
The support shaft 30 passes through the hollow chuck 22 and the cylindrical portion 24 of the rotary traction device 20 and is held by the hollow chuck 22. If the rotary traction device 20 is rotated in this state, the support shaft 30 rotates. If the hollow chuck 22 is moved forward or backward by a certain distance, the support shaft 30 also moves in the axial direction. After the hollow chuck 22 is moved by a predetermined stroke, the holding of the support shaft 30 by the hollow chuck 22 is released, and in the released state, the hollow chuck 22 is returned to the original position in the axial direction. Can be fixed. By repeating such an operation, the support shaft 30 can be intermittently sent forward or backward.
[0039]
A new support shaft 30 can be connected behind the support shaft 30 held by the hollow chuck 22 of the rotary traction device 20. Thus, the support shafts 30 are fed into the pipeline 16 while extending the rows of the support shafts 30.
By feeding the support shaft 30 into the conduit 16 while sequentially connecting the support shaft 30, the tip of the support shaft 30 reaches the opening on the opposite side of the conduit 16, that is, the manhole 12.
[0040]
[Mounting of cutting tool]
As shown in FIG. 3, a cutting tool 40 and a centering tool 50 are attached to a support shaft 30 extending from the conduit 16 to the manhole 12.
As shown in detail in FIG. 2, the centering device 50 includes a disk-shaped centering plate 52 and cylindrical fixed cylinders 56.
[0041]
As shown in FIG. 2B, the outer peripheral shape of the centering plate 52 protrudes in a pentagonal star shape, and forms a part of a cylindrical surface whose tip substantially contacts the inner wall of the conduit 16. At the center of the centering plate 52, a mounting hole 53 concentric with the outer peripheral shape penetrates. The mounting hole 53 is inserted into the support shaft 30. The fixed cylinder 56 is fitted to the support shaft 30 on both sides with the centering plate 52 interposed therebetween. A cotter pin 57 is fitted into the fixed cylinder 56 in the diameter direction. The cotter pin 57 is also fitted and fixed to the support shaft 30. As a result, the centering plate 52 is fixed to the support shaft 30 with both sides sandwiched by the fixed cylinder 56.
[0042]
Attachment of the centering device 50 is performed by fitting the fixing cylinder 56, the centering plate 52, and the fixing cylinder 56 in this order from the end of the support shaft 30 extending to the outside of the conduit 16, displacing the fixing cylinder 56 to a predetermined position, and then fixing. What is necessary is just to fix the cylinder 56 to the support shaft 30 with the cotter pin 57.
In this embodiment, a pair of centering tools 50 are attached at intervals. With a pair of centering tools 50, the support shaft 30 can be accurately arranged at the center of the conduit 16 at two locations in the axial direction. As a result, the center axis of the support shaft 30 and the center axis of the conduit 16 accurately match, and the inclination and eccentricity of the cutting tool 40 can be reliably prevented.
[0043]
The cutting tool 40 is a reamer tool in which a plurality of cutting blades 42 are formed in a conical shape and are arranged in the circumferential direction. The outer shape of the cutting blade 42, that is, the cutting diameter, is considerably larger than the inner diameter of the conduit 16; The thickness is set to be slightly larger than the outer diameter of the lining layer 17.
The cutting tool 40 is fitted with a cylindrical mounting portion 44 from the end of the support shaft 30 and fastened and fixed to the support shaft 30 with a cotter pin or the like. The cutting tool 40 is disposed on the end of the support shaft 30 immediately behind the pair of alignment tools 50, 50.
[0044]
[Cutting process]
As described above, the support shaft 30 to which the alignment tool 50 and the cutting tool 40 are attached is pulled by the rotary traction device 20 in the original direction, that is, in the manhole 10 side.
In the conduit 16 on the manhole 12 side, first, the alignment tool 50 is inserted along the inner wall of the conduit 16. With the movement of the support shaft 30, the centering tool 50 moves while sliding on the inner wall of the conduit 16, and accurately positions the support shaft 30 at the center of the conduit 16.
[0045]
When the cutting tool 40 comes into contact with the end face of the conduit 16 after the pair of centering tools 50 are inserted into the conduit 16, the cutting blade 42 having a larger cutting diameter than the conduit 16 It is arranged on the end face. When the cutting tool 40 is rotated at the same time as the towing, the cutting blade 42 cuts the lining layer 17 of the conduit 16 and the concrete of the culvert block 14 outside thereof with a predetermined cutting diameter, and expands the inner diameter of the conduit 16. .
[0046]
As shown in FIG. 2, the cutting tool 40 is arranged at a center position of the pipe 16 in a state where the center axis direction is correctly oriented by the pair of centering tools 50 and 50 mounted on the support shaft 30. With the movement of 40, the conduit 16 is cut and enlarged.
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, even if the cutting tool 40 shifts or tilts from the center line of the pipe 16 due to cutting resistance or the like. The cutting tool 40 is always returned to the correct position and posture by the correction action by the traction force from the support shaft 30. For example, 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 pipeline 16, When the pushing force acts to further shift the cutting tool 40 from the center of the conduit 16, it is possible to understand the effect of correcting the position and posture of the cutting tool 40 by the traction force of the support shaft 30.
[0047]
Cutting dust and dust generated by cutting the pipe 16 are removed by suction using a vacuum suction pipe 28 provided in the manhole 10.
In the rotary towing device 20, when one of the pulled support shafts 30 is pulled out behind the tubular portion 24, only the rearmost support shaft 30 is disconnected from the front support shaft 30 row. Remove. Accordingly, the support shaft 30 does not remain extended long behind, and the towing operation of the support shaft 30 can be continuously performed even in the manhole 10 where the space is limited.
[0048]
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.
To remove the centering tool 50 and the cutting tool 40 from the support shaft 30, the support shaft 30 equipped with the centering tool 50 and the cutting tool 40 was pulled out of the pipeline 16 to a space before the rotary traction position 20. It may be removed from the end of the support shaft 30 later.
[0049]
If only the inner diameter of the conduit 16 is enlarged, the power transmission cable can be inserted and used after completion of the above steps.
[Pipeline repair process]
The inner wall of the conduit 16 can be repaired with a lining layer of a synthetic resin.
As shown in FIG. 4, the repair tube 60 is inserted into the conduit 16 whose inner diameter is enlarged. The repair tube 60 is a laminated tube of the ultraviolet curable resin layer 62 and the protective film 64.
[0050]
However, in the preparation state of the repair tube 60, the protective film 64 is arranged outside with the ultraviolet curable resin layer 62 inside. 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.
Specifically, when the end of the repair tube 60 is inverted near the end of the conduit 16 and pressure air is sent into the inside of the inverted repair tube 60, the compressed air is pushed by the compressed air, and the inversion of the repair tube 60 is performed. The portion naturally expands, and the repair tube 60 extends to the back of the conduit 16. The ultraviolet curable resin layer 62 is disposed on the inner wall of the conduit 16 in close contact therewith.
[0051]
After the repair tube 60 is disposed over the entire length of the conduit 16, the ultraviolet irradiation lamp 70 is inserted into the repair tube 60. Electric power is supplied to the ultraviolet irradiation lamp 70 via a cable 72. When ultraviolet light is 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 ultraviolet-curable resin layer 62 is completed over the entire length of the conduit 16, after the protective film 64 disposed inside the ultraviolet-curable resin layer 62 is peeled off, the repair work on the inner wall of the conduit 16 can be performed. Complete.
[0052]
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.
[0053]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the cutting-expansion method and apparatus of the existing pipeline which concerns on this invention, the cutting | disconnection operation | work of a pipeline can be performed in the state which supported the cutting tool attached to the support shaft reliably and concentrically with the center of the pipeline. . The pipeline can be enlarged with an accurate cutting diameter without any deviation or eccentricity with respect to the pipeline.
[0054]
Since the rotary traction device for driving the cutting tool is installed outside the pipeline, sufficient cutting ability can be provided, the cutting operation can be performed efficiently, and a defective finish due to lack of ability hardly occurs.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a construction state according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part (a) and a sectional view of a position of a centering tool (b).
FIG. 3 is a sectional view showing an attached state of a cutting tool.
FIG. 4 is a schematic cross-sectional view illustrating a repair process.
[Explanation of symbols]
10, 12 Manhole
14 Sewer block
16 pipeline
17 Lining layer
20 Rotary traction device
22 Hollow chuck
30 support shaft
40 cutting tools
50 alignment tool
52 core alignment plate
56 fixed cylinder

Claims (2)

A method of cutting the inner wall of an existing pipeline to enlarge the inner diameter of the pipeline,
Step (a) of sequentially connecting the support shafts in the axial direction and inserting and disposing from one end to the other end of the existing pipeline,
Outside the pipe at one end of the existing pipe, a cutting tool whose cutting diameter is larger than the inner diameter of the existing pipe is mounted on the support shaft, and has a holed disc shape concentric with the support shaft, and the radial direction is outward. A plurality of projections protruding toward each other, and a centering tool having an outer peripheral shape in which the tips of the projections can slide along the inner wall of the existing pipeline, with respect to a support shaft closer to the pipeline center than the cutting tool. A step (b) of mounting at a plurality of locations with an interval between the cutting tool and each other in the axial direction of the support shaft ,
The support shaft is gripped by a rotary traction device installed outside the other end of the existing pipeline, and the inside of the existing pipeline is pulled while rotating the cutting tool and a plurality of centering tools together with the support shaft to perform cutting. (C) cutting the inner wall of the existing pipeline with a tool to increase the pipeline inner diameter,
Cutting expansion method of existing pipeline including. A device for cutting the inner wall of an existing pipeline to enlarge the inner diameter of the pipeline,
A support shaft that can be connected in the axial direction and is inserted and arranged in the existing pipeline;
A cutting tool mounted on the support shaft, the cutting diameter of which is larger than the inner diameter of the existing pipeline,
Yes the support shaft periphery to be detachably attached at a plurality of positions at intervals in the axial direction against the forms a supporting shaft concentric perforated disc shape, a plurality of protrusions protruding toward the radially outward And a plurality of alignment tools having an outer peripheral shape in which the tip of the projection can slide along the inner wall of the existing pipeline,
A rotary pulling device installed outside the pipeline of the existing pipeline and gripping a middle of the support shaft to pull and rotate in the axial direction;

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