JP2021110372A - Regeneration pipe and pipe regeneration method - Google Patents

Abstract

To provide a regeneration pipe provided with a large number of internal skeleton structure in a circumferential direction and having less deformation against external force, and a pipe regeneration method for laying the regeneration pipe.SOLUTION: A segment 1 constituting a pipe unit has side plates 102, 103 erected on both sides extending in a circumferential direction of an inner surface plate 101, and a plurality of internal plates 106 to 109 erected between the plates on both sides. A ridge 110 extending in a circumferential direction is formed between the internal plates 107, 108 located at the center in a pipe length direction. Between the internal plates 106 and 107, and between the internal plates 108 and 109, which are different from the internal plates on which the ridge is formed, a metal band 30 that goes around the outer periphery of the pipe unit and tightens the pipe unit in the circumferential direction is attached respectively. Deformation of the pipe unit with respect to external force can be suppressed by the ridge and the band.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rehabilitation pipe formed by connecting plastic segments in the circumferential direction to form a pipe unit and connecting the pipe unit in the pipe length direction, and a pipe rehabilitation method for laying the rehabilitation pipe.

When a large-diameter existing pipe such as a sewage pipe buried in the ground becomes old, a repair method that repairs the pipe by lining the inner peripheral surface without digging the existing pipe from the ground is practical. It has been transformed. In such a construction method, the above-described segments are connected in the circumferential direction to assemble a pipe unit, and the pipe unit is connected in the pipe length direction via a connecting member to assemble a rehabilitated pipe in the pipeline. After assembling the rehabilitation pipe in the existing pipe, a filler such as grout is filled between the existing pipe and the rehabilitation pipe and cured to construct a composite pipe.

In tube rehabilitation using a rehabilitation tube using segments, the internal skeletal structure is small in the circumferential direction and it is easily deformed by external force. It has been proposed to construct a unit, attach a restraining member that surrounds the outer periphery of the pipe unit to restrain the pipe unit, and construct a rehabilitated pipe that is prevented from being deformed by an external force (Patent Document). 1, 2).

WO2006 / 027939 Japanese Unexamined Patent Publication No. 2013-19436

In the rehabilitated pipe described in Patent Document 1, the entire circumference of the pipe unit is restrained by a wire or band made of a metal or carbon fiber material, and in the rehabilitated pipe described in Patent Document 2, the pipe unit is made of a wire made of aramid fiber. The whole circumference is restrained. However, in any of the rehabilitated pipes, there is a problem that it is insufficient to prevent deformation due to an external force because the entire circumference of the pipe unit is restrained only at one place when viewed in the pipe length direction. .. Further, if only one place is restrained, the strength is improved at the restrained place, but it is weak at the other places, and there is a problem that the strength in the pipe length direction of the segment becomes non-uniform.

The present invention has been made to solve such a problem, and is a pipe rehabilitation method in which a large number of internal skeleton structures are provided in the circumferential direction and the rehabilitation pipe is less deformed by an external force, and the rehabilitation pipe is laid. The challenge is to provide.

The present invention (claim 1)
A rehabilitation pipe formed by connecting plastic segments in the circumferential direction to form a pipe unit and connecting the pipe units in the pipe length direction.
The segment has an inner surface plate constituting an inner peripheral surface, side plates erected on both sides extending in the circumferential direction of the inner surface plate, and a plurality of inner plates erected between both side plates.
Hereinafter, a ridge extending in the circumferential direction is formed between the plates located at the center when viewed in the pipe length direction with the side plate and the inner plate as plates, respectively.
A feature is that a tightening member that goes around the outer circumference of the pipe unit and tightens the pipe unit in the circumferential direction is attached to each of the first plate and the second plate, which are different from the plates on which the ridges are formed. do.

The present invention (claim 6)
This is a pipe rehabilitation method in which existing pipes are rehabilitated using a rehabilitation pipe formed by connecting plastic segments in the circumferential direction to form a pipe unit and connecting the pipe units in the pipe length direction.
In the following, the process of assembling the pipe unit by connecting the segments in which the ridges extending in the circumferential direction are formed between the plates located at the center in the pipe length direction with the side plate and the inner plate as plates in the circumferential direction.
A process of attaching a tightening member that goes around the outer circumference of the pipe unit and tightens the pipe unit in the circumferential direction between the first plate and the second plate, which are different from the plates on which the ridges are formed.
The process of assembling the rehabilitation pipe in the existing pipe by connecting the pipe units to which the tightening members are attached in the pipe length direction, and
The process of injecting a filler between the existing pipe and the rehabilitation pipe to solidify it,
It is characterized by having.

In the present invention, since the ridge extending in the circumferential direction is provided between the two plates at the center of the segment, the strength of the segment can be increased. In addition, a tightening member that goes around the outer circumference of the pipe unit and tightens the pipe unit in the circumferential direction is attached to each of the two plates that are different from the plate on which the ridges are formed, so that the pipe unit can be deformed by an external force. It can be remarkably suppressed and the strength of the pipe unit in the pipe length direction can be made uniform.

It is a perspective view which showed the structure of the segment used for assembling the rehabilitation tube. It is a perspective view which shows the state which connected the segment in the circumferential direction, and assembled the pipe unit. It is a perspective view which shows the state which attached the metal band to the segment. It is explanatory drawing which showed the state which made the metal band go around the pipe unit, connected both ends of the band, and tightened the pipe unit. It is explanatory drawing which showed the state which connected the pipe unit tightened in the circumferential direction with a metal band in the pipe length direction by using the connecting member. It is a vertical cross-sectional view of the segment connected in the pipe length direction. It is explanatory drawing which shows the state which lays the rehabilitation pipe in the existing pipe.

Hereinafter, the present invention will be described based on the examples shown in the accompanying drawings. The present invention is suitable for rehabilitating or repairing existing large-diameter pipes such as sewage pipes, water pipes, tunnels, and agricultural canals. In the present embodiment, the rehabilitated pipe is described as having a circular cross-sectional shape orthogonal to the pipe length direction, but it goes without saying that the present invention can be applied to a rehabilitated pipe having a shape other than the circular shape.

FIG. 1 illustrates the structure of the rehabilitation tube segment 1 (hereinafter, simply referred to as a segment). The segment 1 includes an inner surface plate 101 constituting the inner peripheral surface of the rehabilitation pipe, side plates 102 and 103 having the same shape vertically erected on both sides extending in the circumferential direction of the inner surface plate 101, and the pipe length direction of the inner surface plate 101. An internal plate 106 having the same height and the same thickness as the side plates 102 and 103, which are erected vertically on both ends of the same shape and a plurality of end plates 104 and 105 having the same shape and are erected at equal intervals on the inner surface plate 101. , 107, 108, 109, which is an integrally molded block-shaped member made of plastic.

In this embodiment, the segment 1 has a shape curved in an arc shape of a predetermined angle that divides the circumference into a plurality of equal parts, for example, 60 degrees that divides the circumference into six equal parts. However, the segment is not limited to an arc shape or a fan shape, and may be a rectangular parallelepiped or a bent shape with a right angle, depending on the cross-sectional shape of the existing pipe, its size, or the repaired part of the existing pipe. can.

Circular insertion holes 102a and 103a for passing the connecting member 11 and the nut 12 (FIG. 5) configured as bolts for connecting the segment 1 in the pipe length direction through the side plates 102 and 103 and the inner plates 106 and 109. , 106a, 109a are formed at equal intervals in the circumferential direction. A plurality of notches 107a and 108a into which the connecting member 11 can be inserted are also formed in the inner plates 107 and 108 at equal intervals.

Circular insertion holes 104a and 105a are formed in the end plates 104 and 105 for passing connecting members such as bolts that connect the segments 1 in the circumferential direction. The segment can be connected in the circumferential direction by bringing the end plate 105 of the end plate 105 into contact with the end plate 104 of another segment and screwing the bolt 6 and the nut 7 inserted into the insertion hole (FIG. 5).

In segment 1 of this embodiment, the end plates 104 and 105 are provided only between the side plate 102 and the inner plate 106, and between the side plate 103 and the inner plate 109, and are provided between the inner plate 106 and the inner plate 107, inside. It is not provided between the plate 107 and the inner plate 108, and between the inner plate 108 and the inner plate 109.

Further, when viewed in the pipe length direction, a ridge 110 extending in the circumferential direction is provided at the center between the two inner plates 107 and the inner plate 108 at the center of the segment, and the inner plate 107 and the inner plate 108 extend over the entire circumference of the segment. It is formed on the inner surface plate 101 in parallel with. The ridge 110 functions as a rib to increase the strength of the segment 1. The height of the ridge 110 is lower than that of the side plates 102 and 103 and the inner plates 106 to 109, and is lower than the height of the connecting member 11 that connects the segment 1 described later in the pipe length direction.

When the segments are sequentially connected in the circumferential direction for one round, the ring-shaped tube unit 10 as shown in FIG. 2 can be assembled. The pipe unit 10 has a shape obtained when a circular pipe is cut into round slices with a predetermined width D perpendicular to the pipe length direction X, and its outer diameter is slightly smaller than the inner diameter of the existing pipe to be rehabilitated. There is. The segment corresponds to a member obtained when the pipe unit 10 is divided (preferably equally divided) into a plurality of pipe units 10 in the circumferential direction C along a cutting surface along the radial direction.

In FIG. 2, the inner surface plate 101, the side plates 102, 103, the end plates 104, and 105, which are the main structural members of the segment 1, are shown, and the reinforcing structures such as the inner plates 106 to 109 and the ridges 110 are shown. Illustrations are omitted to avoid complications.

A tightening member is attached to the pipe unit 10 in order to increase its strength. The tightening member is, for example, a metal band 30, and as shown in FIG. 3, the pipe unit 10 is located in the center between the inner plate 106 and the inner plate 107 and between the inner plate 108 and the inner plate 109, respectively. It can be installed around the entire circumference.

As shown in FIG. 4, the band 30 is attached by changing the tightening force by the combination of the bolts 30a and the nuts 30b attached to both ends. As a result, the deformation (deflection) of the pipe unit 10 due to an external force can be suppressed to a desired value. Further, since the bands 30 are attached to the center between the inner plates, they are arranged at positions symmetrical with respect to the ridge 110 when viewed in the pipe length direction, and the strength of the pipe unit 10 in the pipe length direction can be made uniform. .. The rectangular or circular hole formed in the band 30 is provided to reduce the rigidity of the band 30, and also functions as a hole for passing the bolt 30a.

As shown in FIG. 5, a plurality of nuts 12 are fixed to each segment of the pipe unit 10 in which such a ridge 110 is formed and tightened by the band 30 by using bolts 13. For example, when connecting the segment 1a to the segment 1b in the pipe length direction, a connecting member 11 is used in which a screw portion 11a screwed with the nut 12 is formed at one end and a head 14 having a brim 14a is fixed at the other end. .. A nut that abuts the side plates 103 and 102 of both segments 1a and 1b, passes the connecting member 11 through the insertion holes or notches of the side plates 102 of the segment 1a and the inner plates 106 to 109, and fixes the screw portion 11a to the segment 1b. When screwed into 12, the connecting member 11 and the nut 12 are connected. When the connecting member 11 is screwed into the nut 12 until the brim 14a of the head portion 14 is pressed against the innermost plate 106 at the leftmost end of the segment 1a, both segments 1a and 1b are bolted and connected in the pipe length direction.

A vertical cross-sectional view of the two pipe units connected in the pipe length direction is shown in FIG. 6, and the positional relationship between the ridge 110 and the band 30 can be clearly understood. As shown by the virtual line in FIG. 6, the band 30 can be attached close to the inner plates 106 and 109 on the side away from the ridge 110. Further, as shown by the virtual line, the band 30 may be attached to the center between the side plate 102 and the inner plate 106 and between the side plate 103 and the inner plate 109, respectively. In this case as well, the band 30 can be attached not at the center but toward the inner plates 106 and 109, or closer to the side plates 102 and 103. The side plate and the inner plate can be named, for example, plates when indicating the attachment position of the band 30, and the space between the plates means the space between the inner plates or the space between the side plates and the inner plates.

When rehabilitating an existing pipe using segment 1, first, as shown in FIG. 7, the segment 1 is carried into the existing pipe 21 via the manhole 20, and the segments are sequentially connected in the manhole 20 in the circumferential direction. Assemble the tube unit 10. Subsequently, the tube unit 10 is tightened over the entire circumference with the two bands 30. Subsequently, the pipe unit 10 is sequentially connected in the pipe length direction using the connecting member 11 and the nut 12 by the method shown in FIG. 5, and the rehabilitation pipe 40 is laid in the existing pipe 21. A filler such as grout (not shown) is injected between the existing pipe 21 and the rehabilitation pipe 40, and the filler is solidified to construct a composite pipe composed of the existing pipe 21, the rehabilitation pipe 40, and the filler. ..

In the above-described embodiment, the tightening member is a metallic band, but a metal wire, a band made of aramid fiber, or a wire made of aramid fiber can also be used. The number of inner plates is usually set to 4 or 5, although the larger the number, the better in order to increase the strength.

1 segment 10 pipe unit 21 existing pipe 30 band 40 rehabilitation pipe 102, 103 side plate 106-109 inner plate 110 ridge

Claims (10)

A rehabilitation pipe formed by connecting plastic segments in the circumferential direction to form a pipe unit and connecting the pipe units in the pipe length direction.
The segment has an inner surface plate constituting an inner peripheral surface, side plates erected on both sides extending in the circumferential direction of the inner surface plate, and a plurality of inner plates erected between both side plates.
Hereinafter, a ridge extending in the circumferential direction is formed between the plates located at the center when viewed in the pipe length direction with the side plate and the inner plate as plates, respectively.
A feature is that a tightening member that goes around the outer circumference of the pipe unit and tightens the pipe unit in the circumferential direction is attached to each of the first plate and the second plate, which are different from the plates on which the ridges are formed. Rehabilitation tube to do. The rehabilitation pipe according to claim 1, wherein the tightening member is attached between the first plate and the second plate at a position symmetrical with respect to the ridge when viewed in the pipe length direction. The rehabilitation pipe according to claim 2, wherein the tightening member is attached to the center between the first and second plates, respectively. The rehabilitation pipe according to claim 2, wherein the tightening member is attached close to the plate on the side away from the ridge between the first and second plates. The rehabilitation tube according to any one of claims 1 to 4, wherein the tightening member is made of metal, a band of aramid fibers, or a wire. This is a pipe rehabilitation method in which existing pipes are rehabilitated using a rehabilitation pipe formed by connecting plastic segments in the circumferential direction to form a pipe unit and connecting the pipe units in the pipe length direction.
In the following, the process of assembling the pipe unit by connecting the segments in which the ridges extending in the circumferential direction are formed between the plates located at the center in the pipe length direction with the side plate and the inner plate as plates in the circumferential direction.
A process of attaching a tightening member that goes around the outer circumference of the pipe unit and tightens the pipe unit in the circumferential direction between the first plate and the second plate, which are different from the plates on which the ridges are formed.
The process of assembling the rehabilitation pipe in the existing pipe by connecting the pipe units to which the tightening members are attached in the pipe length direction, and
The process of injecting a filler between the existing pipe and the rehabilitation pipe to solidify it,
A pipe rehabilitation method characterized by being equipped with. The pipe rehabilitation method according to claim 6, wherein the tightening member is attached between the first and second plates at a position symmetrical with respect to the ridge when viewed in the pipe length direction. The pipe rehabilitation method according to claim 7, wherein the tightening member is attached to the center between the first and second plates, respectively. The pipe rehabilitation method according to claim 7, wherein the tightening member is attached close to the plate on the side away from the ridge between the first and second plates. The pipe rehabilitation method according to any one of claims 6 to 9, wherein the tightening member is made of metal, a band of aramid fibers, or a wire.

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