Pipe Regeneration Method

Abstract

A connection implement having elastically deformable claws 32, 33 is fixed to a side plate 103 of one segment 1a. The side plate 103 of one segment 1a and a side plate 102 of another segment 1b are butted against each other, and the claws of the connection implement pass through the side plate of the other segment and protrude into the segment. The claws of the connection implement protruding into the other segment are elastically deformed by a diameter expansion pin 11, and the diameter of the claws 32, 33 are expanded. The side plate of the other segment is pressed against the side plate of the one segment by the claws, of the connection implement, having an expanded diameter, and both segments are connected in the pipe length direction.

Description

[Technical Field]

[0001] The present invention relates to a pipe rehabilitation method in which segments made of an inner surface plate that forms the inner peripheral surface and side plates and end plates that are erected on the periphery of the inner surface plate are integrally formed from plastic, and are connected in the circumferential direction and the pipe length direction to lay a rehabilitation pipe inside an existing pipe. [Background technology]

[0002] When underground pipelines such as sewer pipes become deteriorated, a pipe lining method has been proposed and is already in practical use, in which the pipeline is repaired by applying a lining to the inner surface of the pipeline without digging it up from the ground.

[0003] When rehabilitating large-diameter pipelines, segments are used, each consisting of an inner surface plate that forms the inner periphery, and side and end plates that are erected around the periphery of the inner surface plate, all integrally formed from plastic. The segments are connected circumferentially to form pipe units, which are then connected longitudinally via connecting bolts to assemble the rehabilitated pipe into the existing pipe.

[0004] The following Patent Document 1 describes a configuration in which long connecting bolts are used that extend between both side plates of the segments in the pipe length direction, and these connecting bolts are fixed to the segments and connected to each other to connect the segments in the pipe length direction.

[0005] The following Patent Document 2 describes a configuration in which a nut is fixed to one segment and a connecting bolt is passed through the other segment and screwed into the nut fixed to the one segment, thereby connecting two segments in the pipe length direction.

[0006] The following Patent Document 3 describes a configuration in which a connecting pin with two ridges formed on its outer periphery is separated into two halves by a separation pin, and the side plates of the two segments to be connected are sandwiched between the ridges to connect the two segments in the pipe length direction. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-299711 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-012803 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-101390 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the segment connecting method described in Patent Document 1, the connecting bolts are connected to each other in the pipe length direction, forming a single long rod-shaped member that connects each segment in the pipe length direction. Therefore, the segment parts where the connecting bolts are present are firmly connected, but in parts where the connecting bolts are not present, the segments cannot be connected in the pipe length direction with sufficient strength.

[0009] On the other hand, in the segment connecting method described in Patent Document 2, the nuts are fixed by shifting them circumferentially, which results in a zigzag arrangement of the connecting bolts, making it possible to connect the segments in the pipe length direction with sufficient strength. However, since the nuts are long enough to span the segment side plates and the adjacent internal plates, there are problems in that the threaded portion that screws into the threaded portion of the connecting bolt needs to be long and the nuts need to be expensive.

[0010] Furthermore, because the nut described in Patent Document 2 is long in the pipe length direction, one end of the nut must be fixed by bolting it to an internal plate adjacent to the side plate of the segment, and a dedicated tool with torque control is required to install the nut. Furthermore, if the nut is installed in the wrong position, the bolt must be loosened and it must be reinstalled in the correct position, which creates the problem of time-consuming replacement work.

[0011] In the configuration described in Patent Document 3, the radial distance from the outer peripheral surface of the protrusion formed on the outer periphery of the connecting pin cannot be increased, which causes the protrusion to be low and makes it impossible to clamp both segments with sufficient clamping force.

[0012] The present invention has been made to solve these problems, and its objective is to provide a pipe rehabilitation method that can firmly connect segments in the pipe length direction in a short period of time without using fasteners such as bolts and nuts. [Means for solving the problem]

[0013] The present invention provides A pipe rehabilitation method in which segments each having an inner surface plate, side plates extending in the circumferential direction of the inner surface plate and having insertion holes formed therein, and an inner surface plate each having an inner surface plate and having insertion holes formed therein and being erected on the upper surface of the inner surface plate inside the side plates, are connected in the pipe length direction while butting the side plates of the segments together, thereby laying a rehabilitation pipe inside an existing pipe, a step of preparing a connector having a plurality of claws that are elastically deformable in the radial direction and have a length that allows them to protrude through insertion holes in the side plates of the butted segments; a step of fixing the connector to one of the segments so that the claws pass through insertion holes in the side plates of the one of the segments and protrude to the outside; a step of inserting the claw of the connector protruding from the side plate of one of the segments into an insertion hole in the side plate of the other segment that is to be abutted against the one of the segments, thereby abutting the side plates of both segments together and causing the claw of the connector to protrude into the other segment; a step of elastically deforming the claw of the connecting tool protruding into the other segment to expand the diameter of the claw; a step of pressing the side plate of the other segment against the side plate of the one segment with the claws of the expanded connector to fasten both side plates and connect the one and the other segments in the pipe length direction; The present invention is characterized by comprising: [Effects of the Invention]

[0014] According to the present invention, the claws of the elastically deformable connector are expanded by passing them through the side plates of the butted segments, and the expanded claws of the connector fasten the two segments to connect them in the pipe length direction, so that the segments can be connected in the pipe length direction in a short time.In addition, because the connectors are fixed to the segments, the connectors can be attached in a state where their claws can be expanded before the segments are transported to the construction site, significantly reducing construction time at the site. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view showing the structure of a segment used in assembling a rehabilitation pipe. [Figure 2] FIG. 10 is a perspective view showing a state in which the segments are connected in the circumferential direction to form a pipe unit. [Figure 3] FIG. 10 is an explanatory diagram showing how segments are connected in the pipe length direction. [Figure 4a] FIG. 10 is a perspective view of a connector that connects segments. [Figure 4b] FIG. 10 is a top view of a connector that connects segments. [Figure 4c] 4b is a cross-sectional view taken along line AA of FIG. 4a through the center of the insertion hole of the connector. [Figure 4d] FIG. 10 is a side view of a connector that connects segments. [Figure 5] 10 is an explanatory diagram showing a state in which the claws of the connector are elastically deformed. FIG. [Figure 6] FIG. 10 is a perspective view showing a fastener for fastening the connector to the segment. [Figure 7a] FIG. [Figure 7b] FIG. [Figure 8] FIG. 10 is an explanatory diagram showing a process of fixing the connector to the side plate of the segment. [Figure 9] 10 is an explanatory diagram showing a process of attaching an expansion pin, which expands the diameter of the claw of the connector, to a segment. FIG. [Figure 10]10 is an explanatory view showing a state in which a drop-off prevention member that prevents the expansion pin from dropping off from the segment is attached to the expansion pin. FIG. [Figure 11] 10 is an explanatory diagram showing a process of expanding the diameter of the claws of the connector and connecting the segments. FIG. [Figure 12a] FIG. 9 is a cross-sectional view of the portion indicated by the imaginary line in FIG. 8. [Figure 12b] FIG. 12 is a cross-sectional view of the portion indicated by the virtual line in FIG. [Figure 13] FIG. 10 is an explanatory diagram illustrating the state in which a pipe unit is assembled and a rehabilitation pipe is laid inside an existing pipe. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will be described below based on the embodiments shown in the accompanying drawings. The present invention is suitable for rehabilitating or repairing large-diameter existing pipes, such as sewer pipes, water pipes, tunnels, and agricultural irrigation channels. In the embodiments, the rehabilitating pipe is described as having a circular cross-sectional shape perpendicular to the pipe length. However, the present invention can also be applied to rehabilitating pipes of shapes other than circular, such as rectangular. Furthermore, the present invention can be applied to pipes that do not have a closed cross-sectional shape, such as a horseshoe shape, semicircular shape, or concave shape, with one side open, as they are considered to be pipes.

[0017] In this specification, the pipe length direction refers to the direction indicated by arrow X in FIG. 2, which extends in the length direction of the pipe of the pipe unit 10, and the circumferential direction refers to the circumferential direction of the circle of the pipe unit 10.

[0018] Figure 1 shows the structure of a rehabilitation pipe segment 1 (hereinafter simply referred to as a segment). Segment 1 is a block-shaped, integrally molded plastic member consisting of an inner surface plate 101 that forms the inner peripheral surface of the rehabilitation pipe, side plates 102 and 103 of the same thickness that are erected vertically on both sides of the inner surface plate 101 in the circumferential direction, and end plates 104 and 105 that are erected vertically on both ends of the inner surface plate 101 in the pipe length direction.

[0019] In order to reinforce the mechanical strength of the segment 1, a plurality of internal plates 106, 107 having the same or slightly thinner thickness as the side plates 102, 103 and a similar shape are erected on the upper surface of the inner plate 101 at equal intervals inside the side plates 102, 103, parallel to the side plates 102, 103.

[0020] Segment 1 has a curved shape that divides the circumference into multiple equal parts, for example, a 60-degree arc that divides the circumference into six equal parts, but it can also be a rectangular prism or a shape bent at a right angle, depending on the cross-sectional shape or size of the existing pipe, or the area of ​​the existing pipe to be repaired.

[0021] In the side plates 102 and 103, a plurality of circular insertion holes 102a and 103a are formed at equal intervals in the circumferential direction for inserting expansion pins 11, which will be described later, in order to connect the segments 1 in the pipe length direction. In the inner plate 106, a plurality of circular insertion holes 106a, each with a smaller diameter than the insertion holes 102a and 103a, for inserting the expansion pins 11, are also formed at equal intervals, and in the inner plate 107, a plurality of notches are formed at equal intervals that function as insertion holes 107a into which the expansion pins can be inserted. The positions of these insertion holes 102a, 103a, 106a, and 107a are all aligned in the circumferential direction.

[0022] The end plates 104 and 105 are components arranged in the pipe length direction at both ends of the side plates 102 and 103, and the end plates 104 and 105 have multiple circular insertion holes 104a and 105a formed therein for passing connecting means such as bolts that connect the segments 1 circumferentially.

[0023] Segment 1 can be connected circumferentially by aligning its end plate 105 with the end plate 104 of another segment and abutting it, inserting bolts 6 and nuts 7 (Figure 3) into the insertion holes 104a and 105a, and screwing the bolts 6 and nuts 7 together.

[0024] By sequentially connecting the segments in the circumferential direction, a ring-shaped pipe unit 10 having a predetermined width D perpendicular to the pipe length direction X can be assembled, as shown in Figure 2. The outer diameter of the pipe unit 10 is slightly smaller than the inner diameter of the existing pipe to be rehabilitated. Note that Figure 2 shows the main structural members of the segment 1, namely, the inner plate 101, side plates 102, 103, and end plates 104, 105, but omits the reinforcing structures such as internal plates 106, 107 to avoid complexity.

[0025] As shown in Fig. 3, such a pipe unit 10 is sequentially connected in the pipe length direction by butting the side plates 102, 103 of segments 1a, 1b, and 1c together. In Fig. 3, a plurality of plastic connectors 30 and plastic fixtures 50 are attached between the side plates 103 of segments 1a, 1b, and 1c of the pipe unit and the internal plate 106 adjacent to the side plate 103. Each segment 1a, 1b, and 1c is connected in the pipe length direction via fixtures 50 and connectors 30, as will be described later, by inserting expansion pins 11 that expand the diameter of the claws of connector 30 into insertion holes formed in the side plates 102, 103 and internal plates 106, 107 formed on the segment.

[0026] As shown in Figures 4a to 4d, the connector 30 comprises a circular base plate 31 in which a circular insertion hole 31a of diameter r1 is formed, and claws 32, 33 erected on the periphery of the insertion hole 31a and elastically deformable in the radial direction. The diameter r1 of the insertion hole 31a is set to a value that allows a cylindrical expansion pin 11 of diameter d2 to pass through (lower part of Figure 5). The claws 32, 33 are formed of plastic integrally with the base plate 31, and in this embodiment are formed as a pair of claws arranged at positions facing each other in the radial direction on the periphery of the insertion hole 31a, but three or more claws may also be provided at an interval around the periphery of the insertion hole 31a.

[0027] The substrate 31 is formed in a disk shape with a diameter r2 larger than the diameter r1 of the insertion hole 31a, with both sides flat and a thickness t2. To align the height of the insertion hole 31a in the substrate 31 with the height of the insertion hole 103a (102a) in the side plate 103 (102) of the segment, a portion of the substrate 31 is cut to form a cut surface 31b, but if the heights are the same, cutting is not necessary. A ring-shaped recess 31c is formed on the back of the substrate 31, with a diameter larger than the diameter r1 of the insertion hole 31a, into which the fastener 50 is fitted. In this embodiment, the substrate 31 is circular, but it may also be rectangular.

[0028] The claws 32 and 33 are symmetrical with respect to a vertical plane s1 (FIG. 4b) that passes through the center of the insertion hole 31a, and have a rectangular cross section. The claws 32 and 33 have flat portions on the surface opposite to the opposing surface that are flat surfaces 32a and 33a, and curved portions that include flat inclined surfaces 32b and 33b that rise from the flat surfaces 32a and 33a and slope away from each other, followed by flat inclined surfaces 32c and 33c that slope in the opposite direction.

[0029] The length w1 of the flat surfaces 32a, 33a (the length extending from the base surface in the pipe length direction) is set to twice (2 × t1) or slightly less than twice the length of the side plates 103, 102 of the abutted segments (lower part of Figure 5), and the length w2 of the curved portion is set to a value of approximately (2 / 3) × w1 in this embodiment. The length w1 + w2 of the claws 32, 33 from the base plate 31 is set to a value that allows the claws 32, 33 to pass through the insertion holes 103a, 102a of the side plates 103, 102 of the abutted segments and protrude into the side plate 102.

[0030] The connector 30 is made of an elastically deformable plastic material, for example, rigid polyvinyl chloride (PVC), the same material as the segment 1, and Fig. 5 shows the state in which the claws 32, 33 of the connector 30 elastically deform in the radial direction of the insertion hole 31a. The diameter r2 of the base plate 31 of the connector 30 is larger than the diameter d1 of the insertion hole 102a (103a) in the side plate 102 (103) of the segment, and the base plate 31 cannot pass through the insertion hole 102a (103a). However, the claws 32, 33 are designed so that they can be inserted into the insertion hole 102a (103a) in the side plate 102 (103) by elastically deforming both claws in the direction of approaching each other, as shown in the upper part of Fig. 5.

[0031] On the other hand, as shown in the middle part of Figure 5, when the claws 32 and 33 are inserted into the insertion holes 102a (103a), and then as shown in the bottom part of Figure 5, the expansion pin 11 is inserted between the insertion hole 31a of the base plate 31 and the claws 32 and 33, the claws 32 and 33 elastically deform in the direction of expanding in diameter and pass through the insertion hole 102a of the side plate 102, and the inclined surfaces 32b and 33b of the claws 32 and 33 protruding from the side plate 102 press the side plate 102 against the side plate 103, and both side plates 102 and 103 are firmly fastened together.

[0032] Fixing device 50 is a tool used to secure connecting device 30 to side plate 103 of a segment, and is shown in Figures 6, 7a, and 7b. Fixing device 50 has a cylindrical portion 51 with an outer diameter r3, a cylindrical portion 52 with an outer diameter r4 that is smaller than r3, and a cylindrical portion of a different diameter located between cylindrical portions 51 and 52, and is provided with a cylindrical insertion hole 50a with a diameter r5 through which expansion pin 11 is inserted.

[0033] The diameter r3 of the cylindrical portion 51 is set to be the same as the diameter r2 of the base plate 31 of the connector 30, and the diameter r5 of the insertion hole 50a is set to be the same as the diameter r1 of the insertion hole 31a of the base plate 31. A ring-shaped protrusion 51a is formed on the outer surface of the cylindrical portion 51 to fit into a recess 31c formed in the base plate 31. The lower portion of the cylindrical portion 51 is cut in the same way as the base plate 31 to form a cut surface 51b, and by fitting the protrusion 51a of the cylindrical portion 51 into the recess 31c of the base plate 31, the two components can be connected flush with each other.

[0034] The diameter r4 of the cylindrical portion 52 is larger than the diameter of the insertion hole 106a of the inner plate 106 and is set to a value that prevents the cylindrical portion 52 from passing through the insertion hole 106a. On the other hand, a small-diameter ring-shaped protrusion 52a that fits into the insertion hole 106a is formed on the end face of the cylindrical portion 52.

[0035] 7a and 8, fixing device 50 has a length t3 in the pipe length direction, and the sum of thicknesses (lengths in the pipe length direction) t2 and t3 of base plate 31 of connecting device 30 (t2+t3) is set to a value equivalent to distance t4 between side plate 103 and internal plate 106 of the segment. When claws 32, 33 of connecting device 30 are inserted into insertion holes 103a of side plate 103 and fixing device 50 is press-fitted so that protrusion 51a of cylindrical portion 51 fits into recess 31c of base plate 31 and protrusion 52a of cylindrical portion 52 fits into insertion hole 106a of internal plate 106, as shown in the upper part of FIG. 12, connecting device 30 can be fixed to side plate 103. In this state, the centers of the insertion holes 102a, 103a of the side plates 102, 103, the insertion hole 106a of the inner plate 106, the insertion hole 50a of the fixing device 50, and the insertion hole 31a of the connecting device are aligned, and the expansion pin 11 can be inserted into each insertion hole.

[0036] The fixing device 50 is integrally formed by injection molding using the same material as the segment 1, rigid polyvinyl chloride (PVC), but the material may not be limited to rigid polyvinyl chloride; it may be a resin material that can withstand the strong alkaline components of the filler, such as ABS resin, polypropylene (PP), or nylon.

[0037] The process for connecting segments in the pipe length direction using this configuration will be described below. First, as shown in Figures 5 and 8, the claws 32 and 33 of the connector 30 are elastically deformed and inserted into the insertion hole 103a of the side plate 103 of the segment 1. When the claws 32 and 33 are inserted until the base plate 31 abuts against the side plate 103, the claws 32 and 33 protrude outside the side plate 103. In this state, the fastener 50 is press-fitted so that the protrusion 51a of the cylindrical portion 51 fits into the recess 31c of the base plate 31 and the protrusion 52a of the cylindrical portion 52 fits into the insertion hole 106a of the inner plate 106. As shown in the lower part of Figure 8 and the upper part of Figure 9, the connector 30 can be fixed to the side plate 103.

[0038] Next, as shown in Figure 9, the expansion pin 11 is attached to the segment 1. The expansion pin 11 has a cylindrical shape with a diameter d2 and a tapered conical tip 11a. The rear end of the expansion pin 11 forms a cylindrical head 11b, and the diameter d3 of the head 11b is set so that it can pass through the insertion hole 102a of the side plate 102 but cannot pass through the insertion hole 106a of the inner plate 106.

[0039] A small diameter portion 11c is formed along the circumference at approximately the center in the longitudinal direction of the expansion pin 11. As shown in the middle of Fig. 9, when the expansion pin 11 passes through the insertion holes of the side plate 102 and the inner plates 106 and 107 and the tip 11a is inserted into the insertion hole 50a of the fastener 50, a clip-shaped anti-fall member 12 is attached to this small diameter portion 11c to prevent the expansion pin 11 from falling off the segment, as shown in Fig. 10.

[0040] The capsulation prevention member 12 is made of elastically deformable plastic and has legs 12a and 12b with a width of d4 at its top. The bottom of the capsulation prevention member 12 is an open hollow portion 12c, and the capsulation prevention member 12 is attached to the expansion pin 11 by inserting the small diameter portion 11c into this hollow portion 12c. Even if the expansion pin 11 moves in the pipe length direction, the capsulation prevention member 12 comes into contact with the internal plate 107, preventing the expansion pin 11 from falling off the segment.

[0041] 9, when the expansion pin 11 is further inserted, the stopper member 12 comes into contact with the inner plate 107. In this state, the tip 11a of the expansion pin 11 has not yet reached the point of expanding the claws 32, 33 of the connector 30, and in this state, the stopper member 12 is attached so that it comes into contact with the inner plate 106.

[0042] Since the width d4 between the legs 12a, 12b of the anti-slip member 12 is set to a value larger than the diameter of the insertion holes 106a, 107a of the internal plates 106, 107, the anti-slip member 12 cannot pass through the insertion holes 106a, 107a, and the expansion pin 11, connecting device 30, and fixing device 50 are fixed to the segment 1 in this state.

[0043] The process described above is carried out, for example, in a shipping factory before the segment 1 is transported to the construction site where the rehabilitation pipe will be laid. As shown in Figure 13, the segment 1 to which the expansion pin 11, connector 30, and fixture 50 are attached is transported to the construction site, where the pipe unit 10 is assembled in the manhole 20, and each segment of the pipe unit 10 is connected to the segments of the pipe unit that have already been connected in the pipe length direction.

[0044] Figure 11 shows the state in which one segment of a newly assembled pipe unit is designated 1a and one segment of a pipe unit that has already been connected in the pipe length direction is designated 1b, and the two segments are connected in the pipe length direction. The connector 30, fixing device 50, and expansion pin 11 attached to segment 1a do not fall off from segment 1a during transportation to the construction site, and are in the factory-shipped state shown in the lower part of Figure 9.

[0045] In this state, as shown in the upper part of Figure 11, the claws 32, 33 protruding from the side plate 103 of segment 1a are inserted into the insertion hole 102a in the side plate 102 of segment 1b, and both side plates 103a, 102a are butted together, causing the claws 32, 33 to protrude into the side plate 102 of segment 1b. Because the claws 32, 33 elastically deform in the direction of reducing their diameter, the claws 32, 33 can pass smoothly through the insertion hole 102a and protrude into the side plate 102 of segment 1b.

[0046] 11, the expansion pin 11 is pushed in against the frictional resistance of the fall-off prevention member 12 until its tip 11a is wedged between the claws 32, 33, thereby expanding the diameter of the claws 32, 33. As shown in the bottom part of Fig. 11, when the expansion pin 11 is pushed in until its head 11b abuts against the inner plate 106 adjacent to the side plate 102, the inclined surfaces 32b, 33b of the claws 32, 33 press the side plate 102 of segment 1b against the side plate 103 of segment 1a, clamping both side plates together, thereby firmly connecting the segments 1a, 1b in the pipe length direction.

[0047] The inclined surfaces 32b, 33b of the claws 32, 33 of the connector 30 are inclined so that the force tightening the side plates 102, 103 increases as the diameter of the claws 32, 33 expands, so by changing the shape of the tip 11a of the expansion pin 11 or the shape of the claws 32, 33 that come into contact with the tip 11a, it is possible to increase the tightening force and more firmly connect the segments. In addition, because the expansion pin 11 can be pulled out, the connected segments 1a, 1b can also be disassembled.

[0048] Figure 3 shows three segments 1a, 1b, and 1c connected in the pipe length direction. Multiple connectors 30 are attached to each segment, and connectors attached to adjacent segments are circumferentially offset. This type of attachment makes it possible to uniform the connecting force in the circumferential direction.

[0049] In this way, by connecting the segments of a pipe unit in the pipe length direction to segments of other pipe units that are already connected, the pipe units can be connected to any length in the pipe length direction, and the rehabilitation pipe 40 can be laid inside the existing pipe 21. When the rehabilitation pipe 40 reaches a predetermined length, a filler material is filled between the outer periphery of the rehabilitation pipe 40 and the inner wall surface of the existing pipe 21, and the rehabilitation pipe and the existing pipe are integrated.

[0050] In this embodiment, before being transported to the construction site, the connector 30 is attached to the segment via the fixing device 50, and the claws 32, 33 of the connector 30 are in a state in which they can be expanded using the expansion pin 11. Therefore, at the construction site, all that is required is to butt the segment side plate of the new pipe unit against the segment side plate of the existing pipe unit and expand the claws 32, 33, which significantly reduces the construction time at the site.

[0051] Fixture 50 and expansion pin 11 can be made of metal, but using plastic will reduce weight. Fixture 50 has a shape made up of continuous cylindrical members of different diameters, but it can also be made of a cylindrical member of the same diameter as a whole, or it can be a rectangular parallelepiped with a rectangular cross section. [Explanation of symbols]

[0052] 1 segment 10 tube unit 11 Expansion pin 12 Anti-fall member 20 Manhole 21 Existing pipes 30 Connector 31 PCB 32, 33 Nails 40 Rehabilitation pipe 50 Fixtures 101 Inner plate 102, 103 Side panels 104, 105 end plate 106, 107 Internal plate

Claims

1. A pipe rehabilitation method in which segments each having an inner surface plate, side plates extending in the circumferential direction of the inner surface plate and having insertion holes formed therein, and an inner surface plate each having an inner surface plate and having insertion holes formed therein and being erected on the upper surface of the inner surface plate inside the side plates, are connected in the pipe length direction while butting the side plates of the segments together, thereby laying a rehabilitation pipe inside an existing pipe, a step of preparing a connector having a plurality of claws that are elastically deformable in the radial direction and have a length that allows them to protrude through insertion holes in the side plates of the butted segments; a step of fixing the connector to one of the segments so that the claws pass through insertion holes in the side plates of the one of the segments and protrude to the outside; a step of inserting the claw of the connector protruding from the side plate of one of the segments into an insertion hole in the side plate of the other segment that is to be abutted against the one of the segments, thereby abutting the side plates of both segments together and causing the claw of the connector to protrude into the other segment; a step of elastically deforming the claw of the connecting tool protruding into the other segment to expand the diameter of the claw; a step of pressing the side plate of the other segment against the side plate of the one segment with the claws of the expanded connector to fasten both side plates and connect the one and the other segments in the pipe length direction; A pipe rehabilitation method characterized by comprising:

2. 2. The pipe rehabilitation method according to claim 1, wherein the step of expanding the diameter of the claws uses an expanding pin that is inserted between the claws of the connector to elastically deform the claws.

3. The pipe rehabilitation method described in claim 1, characterized in that the claws of the connecting device have a curved portion whose tip is curved outward, and the surface opposite the tip of the curved portion is inclined, so that when the claws expand in diameter, the inclined surface of the curved portion presses against the side panel of the other segment.

4. The pipe rehabilitation method described in claim 2, characterized in that the connecting device consists of a base plate having an insertion hole through which the expansion pin can pass, and a pair of claws arranged in radially opposite positions around the periphery of the insertion hole in the base plate.

5. 5. The pipe rehabilitation method according to claim 4, wherein the connector is fixed to the side plate of the segment by a fastener having an insertion hole through which an expansion pin can pass.

6. 3. The pipe rehabilitation method according to claim 2, wherein the expansion pin is inserted through an insertion hole in a side plate opposite to the side plate to which the connector is fixed.

7. 7. The pipe rehabilitation method according to claim 6, wherein the expansion pin has a head at its end with a diameter that can pass through the insertion hole in the side plate but cannot pass through the insertion hole in the inner plate.

8. The pipe rehabilitation method described in claim 7, characterized in that when the head of the expansion pin abuts against the inner plate adjacent to the opposite side plate, the claw of the connecting device expands in diameter and presses the side plate of the other segment against the side plate of the one segment.

9. 3. The pipe rehabilitation method according to claim 2, wherein a drop-off prevention member is attached to the expansion pin to prevent the expansion pin from dropping off from the segment.

10. 6. The pipe rehabilitation method according to claim 5, wherein the segments are transported to the construction site with the connectors, the fixing devices and the expansion pins attached to the segments.

11. 6. The pipe rehabilitation method according to claim 5, wherein the connector, the fixing device and the expansion pin are made of plastic.

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