JP2019183987A - Existing pipe reclamation structure and reclamation method - Google Patents

Abstract

To enable an integral formation to be attained with a reclamation pipe at a low cost even if an inner surface of an existing pipe is smooth.SOLUTION: Several installation members 20 are arranged to be spaced apart at a smooth inner peripheral part of an existing pipe 10 in a peripheral direction. The installation members 20 have a base part 21 extending in an axial direction and a protrusion 22 protruded from the base part 21 toward an inner diameter direction. Each of the base parts 21 of the installation members 20 is fixed to an inner surface of the existing pipe 10 by anchor bolts 31. A reclamation pipe 40 lined at the inner circumference of the existing pipe 10 is composed of helical wound band body 41 and constituted by fitting an adjoining wound part 41a of the band body 41. The band body 41 is formed with several protrusions 42 (engagement parts) extending in a longitudinal direction of the band body 41 and spaced apart in a width direction. The protrusion 22 of the installation member 20 enters between thee protrusions 42. A lining material 50 such as mortar and the like is filled between the existing pipe 10 and the reclamation pipe 40.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a structure and method for rehabilitating an existing pipe by lining the rehabilitation pipe on the inner periphery of a sewer pipe or other existing pipe.

It is known to rehabilitate existing pipes such as sewer pipes that have deteriorated by lining them with rehabilitation pipes.
In the rehabilitation method disclosed in Patent Documents 1 to 3, the belt-like body is wound spirally and the edges of the adjacent winding portions of the belt-like body are fitted to each other to form a rehabilitation pipe and disposed on the inner circumference of the existing pipe In addition, a backfill material made of mortar or the like is filled between the existing pipe and the rehabilitation pipe.

  The following rehabilitation methods are also known. A steel ring along the inner circumference of the existing pipe is arranged at an interval in the axial direction of the existing pipe, and a fitting member extending in the axial direction is fitted into the steel ring at an interval in the circumferential direction. Both edge portions of the surface member extending in the direction are fitted into the mating member. A rehabilitation pipe is constructed by arranging the surface members in the circumferential direction without gaps. Finally, the backfill material is filled between the existing pipe and the renovated pipe.

JP 2014-65170 A Japanese Patent Laying-Open No. 2015-105658 Japanese Unexamined Patent Publication No. 2016-43555

  In the methods disclosed in Patent Documents 1 to 3, when the existing pipe is a resin pipe such as reinforced plastic or a steel pipe, or when the existing pipe is already lined with a resin rehabilitation pipe, the inner surface of the existing pipe is smooth. Therefore, the adherence of the backfill material to the existing pipe is weak, and it is difficult to integrate the existing pipe and the renovated pipe via the backfill material.

  In the method using the steel ring described above, the integrity of the existing pipe and the rehabilitated pipe can be ensured, but a large number of steel rings are arranged in the existing pipe and the fitting members extending in the axial direction are bridged over these steel rings. Furthermore, since many surface materials are combined with these fitting members, the number of parts is large and the cost is high.

In order to solve the above problems, the present invention is a structure for rehabilitating an existing pipe, and includes a base portion extending in the axial direction of the existing pipe and a protrusion protruding radially inward from the base portion. A plurality of interposition members arranged at intervals in the circumferential direction of the pipe, a fixing means for fixing the base portion of the interposition member to the inner surface of the existing pipe, and an engagement portion protruding radially outward And a rehabilitation pipe lined on the inner periphery of the existing pipe in a state where the engaging portion is engaged with the protrusion.
According to the said structure, even if the inner surface of an existing pipe is smooth, an existing pipe and a renovated pipe can be integrated via an interposed member. In addition, a steel ring is unnecessary, and the cost can be reduced.

Preferably, the fixing means has an anchor bolt, and the anchor bolt penetrates the base portion of the interposed member and is driven into the existing pipe.
According to the above configuration, the intervention member can be firmly fixed to the existing pipe.

Preferably, the rehabilitation pipe covers the anchor bolt.
According to the said structure, the smooth inner surface of a renovated pipe can be maintained.

Preferably, a filler is filled between the existing pipe and the rehabilitation pipe.
According to the said structure, an existing pipe and a renovated pipe can be integrated more reliably.

Preferably, the rehabilitation pipe is formed of a spirally wound belt-like body, and is configured by fitting adjacent winding portions of the belt-like body, and the belt-like body has the belt-like shape as the engagement portion. A plurality of protrusions extending in the longitudinal direction of the body and spaced apart in the width direction are formed, and the protrusions of the interposition member enter between the protrusions.
According to the above configuration, the rehabilitation pipe is formed by winding a belt-like body in a spiral shape, so that the rehabilitation pipe can be expanded and contracted in the axial direction of the existing pipe, and can avoid deformation and destruction in the event of an earthquake or the like.

Preferably, the tip of the protrusion of the interposition member has a pair of return portions to form an arrowhead shape, and the protrusion of the strip has a hook portion on which the return portion is hooked. .
According to the said structure, an interposed member and a strip | belt-shaped body are reliably engaged, and by extension, an existing pipe and a renovated pipe can be integrated further reliably.

Another aspect of the present invention is a structure for rehabilitating an existing pipe, which is arranged at intervals in the circumferential direction of the existing pipe, and extends in the radial inner direction from the base portion extending in the axial direction. A plurality of interposition members having protrusions, the base portion being fixed to the inner surface of the existing pipe, and a rehabilitation pipe lined in a state separated from the inner periphery of the existing pipe by the protrusions of the interposition members; And a filler filled between the existing pipe and the renovated pipe, and an anchor bolt penetrating the rehabilitated pipe and the filler into the existing pipe.
According to the above configuration, the existing pipe and the renovated pipe can be integrated by the filler and the anchor bolt. In addition, a steel ring is unnecessary, and the cost can be reduced.

Preferably, the rehabilitation tube is formed by a spirally wound belt-like body, and is configured by fitting adjacent winding portions of the belt-like body, and the belt-like body extends in the longitudinal direction of the belt-like body. In addition, a plurality of protrusions spaced apart in the width direction are formed, the protrusions of the interposition member are inserted between the protrusions, and the anchor bolt also penetrates the base portion of the interposition member.
According to the said structure, an interposed member can also contribute to integration of an existing pipe and a renovated pipe.

Still another aspect of the present invention is a method of rehabilitating an existing pipe, and includes a plurality of interposed members having a base portion extending in the axial direction of the existing pipe and a protrusion protruding radially inward from the base portion. A step of fixing the inner surface of the existing pipe with an interval in the circumferential direction, and winding the strip-like body in a spiral and fitting the adjacent winding parts of the strip-like body together, A step of lining the inner periphery of the existing pipe with a rehabilitation pipe, wherein the strip has a plurality of ridges extending in the longitudinal direction and spaced apart in the width direction, and between the ridges. It is characterized by comprising the steps of making a pipe while inserting the protrusion and filling the filler between the existing pipe and the renovated pipe.
According to the said method, a rehabilitation pipe | tube and an interposed member can be engaged in the process of manufacturing a rehabilitation pipe | tube.

In the above method, in one specific aspect, in the step of fixing the interposed member to the existing pipe, an anchor bolt is driven through the base portion of the interposed member into the existing pipe.
In another specific aspect, the method further includes a step of driving the anchor bolt through the existing pipe and the filler and then driving the anchor bolt into the existing pipe after the step of filling the filler.

  According to the present invention, even if the existing pipe has a smooth inner surface, it can be integrated with the rehabilitation pipe at low cost.

It is a schematic cross-sectional view explaining the rehabilitation method of the existing pipe according to 1st Embodiment of this invention later on, (A) is the state before the rehabilitation of the existing pipe, (B) is the interposed member extended in an axial direction. Is a state in which is fixed to the inner periphery of the existing pipe with an anchor bolt, and FIG. It is a principal part expanded longitudinal cross-sectional view which shows the existing pipe before rehabilitation. It is a principal part expansion longitudinal cross-sectional view which shows the state which fixed the said intervention member to the inner periphery of the existing pipe with the said anchor bolt. It is a principal part expansion longitudinal cross-sectional view which shows the process of engaging a strip | belt shaped body with the said interposed member, manufacturing a rehabilitation pipe | tube with a strip | belt shaped body. It is a principal part expanded longitudinal sectional view which shows the state which the rehabilitation pipe | tube was completed. It is a principal part expanded vertical sectional view which shows the state with which the backfilling material was filled between the existing pipe and the renovated pipe. It is a principal part expansion longitudinal cross-sectional view which shows the state which fixed the intervention member extended in an axial direction to the inner periphery of the existing pipe in the rehabilitation method of the existing pipe which concerns on 2nd Embodiment of this invention. In the said 2nd Embodiment, it is a principal part expanded longitudinal cross-sectional view which shows the process of engaging a strip | belt shaped body with the said interposed member, manufacturing a renovated pipe with a strip | belt shaped body. It is a principal part expanded longitudinal sectional view which shows the state which fixed the renovated pipe to the existing pipe with the anchor bolt.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The existing pipe to be rehabilitated is, for example, an underground sewer pipe. As shown in FIGS. 1 (A) and 2, the existing pipe 10 of this embodiment is obtained by renewing an old main pipe 11 once, and an old renovated pipe 12 is lined inside the main fence 11. A back-filling material 13 such as mortar is filled between the main pipe 11 and the old rehabilitation pipe 12. Although the old rehabilitation pipe 12 of this embodiment is made of resin and has the same configuration as the new rehabilitation pipe 40 described later, it will not be described in detail. However, since the inner surface is smooth, a backfill material such as mortar is difficult to adhere. The old rehabilitation pipe 12 may be a resin pipe having another structure.

  The rehabilitation method for the existing pipe 10 will be described in order. First, as shown in FIG. 1B and FIG. 3, a plurality of elongated interposed members 20 extending in the axial direction of the existing pipe 10 are fixed to the inner surface of the existing pipe 10 at equal intervals in the circumferential direction. . In this embodiment, the intervention member 20 is arrange | positioned at four places at 90 degree intervals.

  The interposition member 20 is formed in a plurality of (three in the present embodiment) at an equal interval in the longitudinal direction of the base portion 21 that is integrated with the base portion 21 and has an elongated plate-like base portion 21 that extends linearly. And a protrusion 22.

  The tip of the protrusion 22 has an arrowhead shape, a plate-like main portion 22 a protruding from the base portion 21 toward the radially inward direction of the existing pipe 10, and the tip of the main portion 22 a to the base portion 21. And a pair of return portions 22b extending obliquely toward the surface. The pair of return portions 22b are disposed on both sides in the longitudinal direction of the base portion 21 with respect to the main portion 22a.

One end portion 21a of the base portion 21 of the intervention member 20 is biased radially inward of the existing tube 10 by the thickness of the base portion 21 from other portions. The one end portion 21a of the base portion 21 and the existing tube 10 are offset. The other end portion 21b of the base portion 21 of the adjacent interposing member 20 is inserted between the inner surface of each of the intermediate members. In this way, the base portions 21 of the plurality of interposed members 20 are in contact with the inner surface of the existing tube 10 and are continuous in the axial direction of the existing tube 10 so that the end portions 21a and 21b overlap each other.
In addition, since the alignment of the intervention member 20 in the axial direction is based on the linear trace (the joint of the strip-shaped body) of the old rehabilitation pipe 12, no prior measurement is required.

  The intervention member 20 is fixed to the existing pipe 10 by fixing means 30 at a plurality of locations (three locations in the present embodiment) at intervals in the longitudinal direction. The fixing means 30 has an anchor bolt 31, and this anchor bolt 31 penetrates the base portion 21 of the interposed member 20 and is driven into the existing pipe 10.

  The anchor bolt 31 may penetrate the old renovated pipe 12 in the existing pipe 10 and pierce at least one of the main pipe 11 and the backfill material 13. For example, as shown in FIG. 1 (A), when the center of the old rehabilitation pipe 12 is biased downward from the center of the main pipe 11, the lower anchor bolt 31 is shown in FIG. 1 (B). Pierces only the main rod 11, the upper anchor bolt 31 does not reach the main tube 11, only the backfill material 13, and the left and right anchor bolts 31 pierce both the backfill material 13 and the main tube 11. Yes.

  The anchor bolt 31 has a male threaded portion formed at an end projecting inward in the radial direction of the existing pipe 10 from the base portion 21 of the interposed member 20, and a nut 32 screwed into the male threaded portion is attached to the anchor bolt 31. The intervention member 20 is fixed by tightening.

Next, as shown in FIG. 1 (C), FIG. 4 and FIG. 5, the rehabilitation pipe 40 is newly lined on the inner circumference of the existing pipe 10 using a long strip 41 made of resin, for example, polyethylene. . One surface of the belt-like body 41 is smooth, and a plurality of protrusions 42 extending in the longitudinal direction are formed at equal intervals in the width direction on the other surface. These ridges 42 have a T-shaped cross section and have a pair of hooking portions 42a projecting laterally at the tip. The protrusion 42 plays a role of improving adhesion to a backing material 50 (filler) described later, but the selected protrusion 42 is engaged with the protrusion 22 of the interposition member 20 as described later. Also plays a role as a joint.
The belt-like body 41 has a female fitting portion 43 on one edge in the width direction, and a male fitting portion 44 on the other edge.

  As shown in FIG. 4, in the existing pipe 10, a belt-like body 41 is spirally wound using a pipe making machine (not shown), the edges of adjacent winding portions 41a are overlapped, and one winding portion 41a is overlapped. By mating the male fitting portion 44 of the other winding portion 41a with the female fitting portion 43, a new rehabilitation pipe 40 is manufactured as shown in FIG. Since the inner peripheral surface of the rehabilitation pipe 40 is constituted by the smooth surface of the belt-like body 41, it is smooth. Since this pipe manufacturing method is known as shown in Patent Documents 1 to 3, detailed description thereof is omitted.

  When the rehabilitation pipe 40 is manufactured, the protrusions 22 of the interposing member 20 are engaged between the protrusions 42 of the respective winding portions 41a of the belt-like body 41. More specifically, the pair of return portions 22b of the protrusion 22 enters and engages between the protrusions 42 while being elastically deformed. Since the pair of return portions 22b of the protrusions 22 are hooked on the hook portions 42a of the protrusions 42 on both sides thereof, the belt-like body 41 and thus the rehabilitation pipe 40 are separated from the inner peripheral surface of the existing pipe 10 and the interposed member 20 Is supported stably.

By manufacturing the renovated pipe 40 through the interposing member 20 as described above, the renovated pipe 40 is supported in a state of being separated from the inner periphery of the existing pipe 10.
Finally, as shown in FIG. 6, a backfill material 50 (filler) such as mortar is filled between the inner circumference of the existing pipe 10 and the outer circumference of the renovated pipe 40. The curing of the backfill material 50 completes the rehabilitation of the existing pipe 10.

  In the rehabilitation structure of FIG. 6, the inner peripheral surface of the existing pipe 10, that is, the inner peripheral surface of the resin-made old rehabilitation pipe 12 is smooth, but the rehabilitation is performed on the interposed member 20 fixed to the existing pipe 10 by the anchor bolt 31. Since the pipe 40 is engaged, the existing pipe 10 and the renovated pipe 40 can be integrated with a small number of parts without using a steel ring or the like. The backfill material 50 has a role of preventing deformation and deterioration of the rehabilitation pipe 40 due to water pressure, but since the engagement structure between the protrusion 22 of the interposed member 20 and the protrusion 42 of the belt-like body 41 is solidified, the existing pipe 10 This also contributes to the integration of the rehabilitation pipe 40.

  In the above embodiment, even if an earthquake occurs and the backfill material 50 is cracked, the rehabilitation pipe 40 extends and contracts in the axial direction to avoid breaking. Since the rehabilitation pipe 40 is constructed by spirally winding and fitting the belt-like body 41, the rehabilitation pipe 40 can be expanded and contracted, and a number of the interposition members 20 are arranged in the axial direction, and the expansion and contraction of the rehabilitation pipe 40 is allowed. It is.

In the above embodiment, when the backing material 50 is filled, the protrusion 22 of the interposing member 20 omits the return portion 22b and is loosely inserted between the protrusions 42 of the belt-like body 41 to obtain an engaged state. Also good.
Even if the rehabilitating tube 40 is not formed by being spirally wound around the belt-like body 41, it is preferable that the rehabilitating tube 40 has a structure that can expand and contract in the axial direction, for example, a bellows structure.

Next, the rehabilitation method according to the second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, components corresponding to those in the first embodiment are denoted by the same or similar numbers, and detailed description thereof is omitted.
As shown in FIG. 7, the existing pipe 10A of the present embodiment is made of a resin pipe such as a reinforced plastic pipe, so that its inner peripheral surface is smooth and the backfilling material is difficult to adhere.

In the first step, the elongated interposed member 20A is fixed to the inner periphery of the existing pipe 10A with an adhesive or the like in the same arrangement as in the first embodiment.
The intervention member 20A includes a base portion 21 and a flat plate-shaped protrusion 22A that is disposed at an interval in the longitudinal direction.

Next, as shown in FIG. 8, the rehabilitation pipe 40 is newly produced using the belt-like body 41 and is lined on the inner circumference of the existing pipe 10. Since this process is the same as that of the first embodiment, detailed description thereof is omitted.
When the rehabilitation pipe 40 is manufactured, the protrusion 22A of the interposing member 20A enters and engages between the two protrusions 42 of each winding portion 41a of the belt-like body 41. The protrusion 22A also plays a role of separating the rehabilitation pipe 40 from the inner periphery of the existing pipe 10A.

  Next, as shown in FIG. 9, a backfill material 50 such as mortar is filled in the gap between the inner circumference of the existing pipe 10 </ b> A and the outer circumference of the renovated pipe 40. After the backing material 50 is cured, the anchor bolt 31 penetrates the rehabilitated tube 40, the backing material 50 and the base portion 21 of the interposition member 20 and is driven into the existing tube 10A. By tightening the nut 32 screwed into the male thread portion of the anchor bolt 31, the rehabilitation pipe 40 is fixed, and the rehabilitation of the existing pipe 10 is completed.

In the above configuration, the rehabilitation pipe 40 can be firmly integrated with the existing pipe 10 by the interposed member 20 and the anchor bolt 31.
The intervention member 20 of the present embodiment not only plays a role of separating the rehabilitated tube 40 and the existing tube 10 by the anchor bolt 31 passing therethrough and engaging with the rehabilitated tube 40, but also rehabilitated. This can contribute to the integration of the pipe 40 and the existing pipe 10.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
The anchor bolt that is driven into the existing pipe may penetrate through the existing pipe.
The intervention members may be arranged in the axial direction without overlapping the end portions, or may be arranged in the axial direction at intervals.
The filler may be filled with an interval in the axial direction between the existing pipe and the rehabilitation pipe. Moreover, you may use an impact-absorbing material as a filler.
The rehabilitation pipe may be constituted by connecting strip-shaped plate materials.
The existing pipe is not limited to a sewer pipe, and may be a water pipe, an agricultural water pipe, a gas pipe, or the like.

  The present invention can be applied to, for example, rehabilitation of an aged sewer pipe.

10, 10A Existing pipe 20, 20A Intervening member 21 Base part 22, 22A Protrusion 22b Return part 30 Fixing means 31 Anchor bolt 40 Rehabilitation pipe 41 Strip body 41a Winding part 42 Projection (engagement part)
42a Hook 50 Backing material (filler)

Claims (10)

It is a structure to rehabilitate existing pipes,
A plurality of interposition members having a base portion extending in the axial direction of the existing pipe and a protrusion protruding radially inward from the base portion, and arranged at intervals in the circumferential direction of the existing pipe;
Fixing means for fixing the base portion of the intervention member to the inner surface of the existing pipe;
A rehabilitation pipe lined on the inner periphery of the existing pipe, with an engagement part projecting radially outward, with the engagement part engaged with the protrusion;
An existing pipe rehabilitation structure characterized by comprising   2. The existing pipe rehabilitation structure according to claim 1, wherein the fixing means has an anchor bolt, and the anchor bolt penetrates the base portion of the interposed member and is driven into the existing pipe. .   The rehabilitation structure for an existing pipe according to claim 2, wherein the rehabilitation pipe covers the anchor bolt.   The rehabilitation structure for an existing pipe according to any one of claims 1 to 3, wherein a filler is filled between the existing pipe and the rehabilitation pipe.   The rehabilitation pipe is formed by a spirally wound belt-like body, and is configured by fitting adjacent winding portions of the belt-like body. The belt-like body has a longitudinal portion of the belt-like body as the engagement portion. The existing protrusion according to any one of claims 1 to 4, wherein a plurality of protrusions extending in the direction and spaced apart in the width direction are formed, and the protrusions of the interposition member are inserted between the protrusions. Rehabilitation structure of the pipe. It is a structure to rehabilitate existing pipes,
The base pipe is disposed at intervals in the circumferential direction, and has a base portion extending in the axial direction and a protrusion protruding radially inward from the base portion, and the base portion is fixed to the inner surface of the existing pipe. A plurality of intervention members;
A rehabilitated pipe lined in a state of being separated from the inner circumference of the existing pipe by the protrusion of the intervention member;
A filler filled between the existing pipe and the rehabilitation pipe;
Anchor bolts that penetrate the rehabilitation pipe and the filler and are driven into the existing pipe;
Rehabilitation structure of existing pipes characterized by comprising   The rehabilitation pipe is formed by a spirally wound belt-like body, and is configured by fitting adjacent winding portions of the belt-like body. The belt-like body extends in the longitudinal direction of the belt-like body and extends in the width direction. A plurality of protrusions spaced apart from each other are formed, protrusions of the interposition member are inserted between the protrusions, and the anchor bolt also penetrates the base portion of the interposition member. Item 6. The existing pipe rehabilitation structure according to item 6. A method of rehabilitating existing pipes,
Fixing a plurality of interposition members having a base portion extending in the axial direction of the existing pipe and a protrusion protruding radially inward from the base portion to the inner surface of the existing pipe at intervals in the circumferential direction;
A step of winding a strip-like body in a spiral and making a rehabilitation pipe by fitting adjacent winding portions of the strip-like body, and lining the inner circumference of the existing pipe with the rehabilitation pipe, A body having a plurality of ridges formed in the longitudinal direction and spaced in the width direction, and making a pipe while inserting the protrusions between the ridges;
Filling a filler between the existing pipe and the rehabilitation pipe;
A method for rehabilitating an existing pipe, characterized by comprising:   The method for rehabilitating an existing pipe according to claim 8, wherein, in the step of fixing the interposed member to the existing pipe, an anchor bolt is driven through the base portion of the interposed member and driven into the existing pipe. The existing pipe according to claim 8, further comprising a step of driving the anchor bolt into the existing pipe through the existing pipe and the filler after the step of filling the filler. Rehabilitation method.

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