JP2022137758A - Reinforcement member of multi-unit tube and rehabilitation method for existing pipe - Google Patents

Abstract

To provide a reinforcement member that enhances the reinforcement effect on a multi-unit tube constructed by the rehabilitation of an existing pipe and a rehabilitation method for the existing pipe.SOLUTION: A reinforcement member 5 that is included between an existing pipe 1 and a rehabilitation pipe 2 when constructing a multi-unit tube 4 by filling a back-filling material 3 between an outer existing pipe 1 and an inner rehabilitation pipe 2 comprises an outer plate part 51 in a side of the existing pipe 1, an inner plate part 52 in a side of the rehabilitation pipe 2, and a rib 53 that is installed between the outer plate part 51 and the inner plate part 52 and securing the distance between plate parts 51 and 52.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a reinforcing member used to rehabilitate existing pipes such as aged sewage pipes, water supply pipes, and tunnels, and a method for rehabilitating existing pipes.

In order to rehabilitate an existing pipe that has deteriorated, a rehabilitated pipe is installed inside the existing pipe, a backfilling material is filled between the existing pipe and the rehabilitated pipe, and the existing pipe, the rehabilitated pipe, and the backfilling material are integrated. Methods of constructing tubes are known. In this method, in order to increase the strength of the composite pipe, a reinforcing member is interposed between the existing pipe and the rehabilitated pipe, or a spacer is used to secure the filling interval of the back-filling material and increase the pipe thickness of the composite pipe. is being done.

Patent Literature 1 listed below discloses a framework made of reinforcing bars as a reinforcing member interposed between an existing pipe and a rehabilitation pipe. The framework is formed in a basket shape by binding a plurality of reinforcing bars extending along the circumferential direction of the existing pipe and a plurality of reinforcing bars extending along the axial direction.

In the rehabilitation of an existing pipe using a framework according to Patent Document 1, a framework is assembled in the existing pipe, and a plurality of split panels are connected inside the framework in the circumferential and axial directions of the existing pipe to provide a rehabilitation pipe. there is After that, a back-filling material is filled between the existing pipe and the rehabilitated pipe, and the frame body is buried.

Patent Document 2 below discloses a steel spacer interposed between an existing pipe and a rehabilitated pipe. This spacer has a leg portion on the side of the existing pipe and a mounting member on the side of the rehabilitation pipe. A plurality of legs extend along the axial direction of the existing pipe and are spaced apart in the circumferential direction of the existing pipe. The mounting member is formed of a plate material, is bridged over and fixed to the plurality of legs, and is arranged at intervals in the axial direction of the existing pipe.

In the rehabilitation of an existing pipe using a spacer in Patent Document 2, a spacer is installed in the existing pipe, a rehabilitation pipe is provided so as to be mounted on a mounting member for the spacer, and a backfilling material is provided between the existing pipe and the rehabilitation pipe. is filled and the spacer is embedded.

Japanese Patent Application Laid-Open No. 2003-314197 Japanese Patent No. 6679800

The framework disclosed in Patent Literature 1 does not ensure a sufficient filling thickness, and has a weak reinforcing effect against the force acting in the radial direction of the composite pipe. In addition, since the frame body is assembled inside the existing pipe and the rehabilitated pipe is formed with the split panels inside, it is necessary to stop the flow of water through the existing pipe, and accordingly, it is necessary to install a bypass pipe.

The spacer disclosed in Patent Document 2 is mainly intended to give a slope to the rehabilitated pipe, and secondarily, the pipe thickness increased by the spacer and the steel material portion of the spacer contribute to reinforcement. The steel plate mounting member placed inside part of the spacer (on the side of the rehabilitating pipe) can be expected to have a reinforcing effect against the force acting in the radial direction of the composite pipe. pipe side) is poor in reinforcing effect.

The present invention has been made to solve at least one of the above problems, and a reinforcing member for a composite pipe according to one aspect of the present invention comprises:
A reinforcing member interposed between the existing pipe and the rehabilitation pipe when the composite pipe is constructed by filling the space between the existing pipe on the outside and the rehabilitation pipe on the inside with a backfilling material,
a first plate portion on the existing pipe side;
a second plate portion on the rehabilitation pipe side;
and a separating portion that is provided between the first plate portion and the second plate portion and that secures an interval between the two plate portions.

According to the above configuration, the reinforcing effect of the composite pipe can be enhanced by the two plate portions on the rehabilitated pipe side and the existing pipe side and the pipe thickness based on the gap secured by the separation portion.

Preferably, the first plate portion has a shape corresponding to the inner surface shape of the existing pipe.
According to the above configuration, the reinforcing member can be stably laid on the existing pipe.

Preferably, at least one of the first plate portion and the second plate portion is formed with a plurality of holes.
According to the above configuration, the back-filling material can be distributed between the two plate portions through the plurality of holes.

Preferably, the separating portion is formed of a plate-like rib.
According to the above configuration, the first plate portion and the second plate portion are reinforced, and the reinforcing function can be enhanced.

Preferably, the plate-like rib is formed with a plurality of holes.
According to the above configuration, the back-filling material can be spread over the space separated by the rib between the two plate portions.

Another aspect of the present invention is a method for rehabilitating an existing pipe, comprising:
Laying the reinforcing member inside the existing pipe;
A belt-shaped member is spirally wound to form a rehabilitating pipe inside the existing pipe, the reinforcing member is interposed between the existing pipe and the rehabilitating pipe, and a space for filling a backfilling material is formed. process and
and filling a gap between the existing pipe and the rehabilitated pipe with a back-filling material to construct a composite pipe.
According to the above configuration, it is possible to construct a composite pipe with enhanced reinforcing effect by securing the reinforcing member and the pipe thickness.

ADVANTAGE OF THE INVENTION According to this invention, the reinforcement effect of the composite pipe constructed|assembled by rehabilitation of an existing pipe can be heightened.

1 is a perspective view showing a reinforcing member according to a first embodiment of the invention; FIG. FIG. 4 is a cross-sectional view showing a composite pipe provided with the same reinforcing member cut in a direction perpendicular to the pipe axis; 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. (A) It is an enlarged view of the circle part IVA of FIG. (B) is a cross-sectional view of a band-shaped member that constitutes a rehabilitating pipe of the same composite pipe. FIG. 5 is a perspective view showing a reinforcing member according to a second embodiment of the invention;

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. In this embodiment, the present invention is applied to a method for rehabilitating an existing sewage tunnel, which is an existing dilapidated pipe, and a reinforcing member used for rehabilitating it.

(Rehabilitation of existing pipes)
The existing pipe 1 shown in FIGS. It is rehabilitated by constructing a composite pipe 4 in which the filling material 3 is integrated. In this rehabilitation, the reinforcing member 5 shown in FIG. 1 is interposed between the existing pipe 1 and the rehabilitation pipe 2 and embedded in the backfilling material 3 .

(existing pipe)
The sewerage tunnel, which is the existing pipe 1, is made of concrete and is buried in the ground. The existing pipe 1, as shown in FIG. and an arch-shaped top plate portion 13 connecting the upper ends of the side wall portions 12, 12 to each other.

The top plate portion 13 and the side wall portions 12, 12 have steel pipes 1a inside. The bottom plate portion 11 does not have steel pipes inside and is plain concrete.
The existing pipe 1 may be a sewage pipe, an agricultural water pipe, an industrial water pipe, a water supply pipe, a power generation water pipe, other tunnels, and the like.

(rehabilitation pipe)
As shown in FIG. 3, the rehabilitated pipe 2 is obtained by spirally winding a belt-like member 20 along the inner circumference of the existing pipe 1 . The strip member 20 includes a main strip member 21 and a reinforcing strip member 22, as shown in FIG. 4(B).
The main strip 21 is formed of a synthetic resin material such as rigid vinyl chloride, has a constant cross section, and extends in a long shape in a direction perpendicular to the plane of FIG. 4(B).

The main belt member 21 integrally has a flat belt portion 23 , T ribs 24 and 25 , a first fitting portion 26 , a second fitting portion 27 , and a sublock piece 28 .
A flat front side surface 23 a of the flat belt portion 23 constitutes the inner peripheral surface of the rehabilitating pipe 2 , and a rear side surface 23 b of the flat belt portion 23 faces the outer circumference of the rehabilitating pipe 2 . Each of the T-ribs 24 and 25 projects straight from the rear side surface 23b and has a T-shaped cross section. The first fitting portion 26 is formed in a concave groove shape at one end side of the main strip 21 in the width direction (right and left in FIG. 4(B)). The second fitting portion 27 is formed in a convex shape on the other widthwise end side of the main strip 21 . The sub-lock piece 28 obliquely protrudes from the first fitting portion 26 at one end side of the main strip 21 in the width direction.

A flat sealing material joint surface 29 is formed between the sub-lock piece 28 and the first fitting portion 26, and a sealing material 23c is formed on the rear surface 23b between the second fitting portion 27 and the T-rib 25. is provided. A housing portion 23d for housing the reinforcing strip material 22 is formed between the T rib 24 and the T rib 25 on the rear side surface 23b of the flat belt portion 23. As shown in FIG.

The reinforcement strip 22 is formed by bending a steel strip, has a W-shaped constant cross section, and extends in the same direction as the main strip 21 (direction orthogonal to the paper surface of FIG. 4B). ing. The reinforcing strip 22 is fitted in the housing portion 23d, and both ends of the main strip 21 in the width direction (right and left in FIG. 4B) are engaged with the tips of the T ribs 24 and 25. As shown in FIG.

As shown in FIG. 4A, in the rehabilitating pipe 2, the first fitting portion 26 and the second fitting portion 27, which are adjacent to each other and are adjacent to each other in a spirally wound belt-shaped member 20, are fitted together to form a saber. The tip of the block piece 28 is engaged with the tip of the T-rib 25, and the sealing material joint surface 29 is pressed against the sealing material 23c.

(back-filling material)
The back-filling material 3 is mortar or the like, and may be a resin-based mortar obtained by blending cement with a lightweight aggregate, an emulsion, a shrinkage reducing agent, or the like. The back-filling material 3 is filled in the space S between the existing pipe 1 and the rehabilitation pipe 2, adheres to and integrates the existing pipe 1 and the rehabilitation pipe 2, and imparts water stoppage. The composite pipe 4 is thereby constructed. Since the back-filling material 3 does not disperse even if it is injected into water, it can be injected into details while pushing out the water.

(reinforcing member)
The reinforcing member 5 shown in FIG. 1 is for raising and reinforcing the composite pipe 4. As shown in FIGS. It is laid on the inner surface of the bottom plate portion 11 of 1. The reinforcing member 5 includes an outer plate portion 51 (first plate portion) on the existing pipe 1 side, an inner plate portion 52 (second plate portion) on the rehabilitation pipe 2 side, an outer plate portion 51 and an inner plate portion 52 . It has a rib 53 (separation part) between.

The outer plate portion 51 is made of a steel plate and has a rectangular shape, and has sides extending in a first direction and sides extending in a direction perpendicular to the first direction. It is formed long in the direction The plate surface of the outer plate portion 51 is formed corresponding to the inner surface shape of the bottom plate portion 11, and is flat in this embodiment.

The inner plate portion 52 is made of a steel plate and has the same shape and dimensions as the outer plate portion 51 , faces the outer plate portion 51 at regular intervals, and is located at the same position as the outer plate portion 51 in plan view. The inner plate portion 52 is formed with a plurality of holes 52a through which the backfilling material 3 can flow. The inner plate portion 52 may be made of punching metal. Incidentally, like the inner plate portion 52, the outer plate portion 51 may also be formed with a plurality of holes through which the back-filling material 3 can flow.

The rib 53 has a function of ensuring a space between the outer plate portion 51 and the inner plate portion 52. The rib 53 is made of a steel plate and has an elongated rectangular shape. The outer plate portion 51 and the inner plate portion 52 are connected with the plate surface facing the second direction (longitudinal direction of the outer plate portion 51 and the inner plate portion 52). The rib 53 is fixed to the outer plate portion 51 and the inner plate portion 52 by welding or the like. The outer plate portion 51 and the inner plate portion 52 are reinforced by the ribs 53 .

A plurality of (five in this embodiment) ribs 53 are provided, and are arranged at equal intervals from both ends of the outer plate portion 51 and the inner plate portion 52 in the second direction. Each rib 53 is formed with a plurality of holes 53a through which the backfilling material 3 can flow.

A plurality of reinforcing members 5 can be connected in series in the first direction or in parallel in the second direction by connecting means (not shown). The connecting means can be provided on one or both of the two reinforcing members 5 to be connected, or can be provided separately. For example, hooks provided at the ends of the reinforcing member 5 may be engaged with each other. By forming the reinforcing member 5 in a size that can be carried into the existing pipe 1 and connecting the reinforcing member 5 when laying the reinforcing member 5 on the existing pipe 1, the existing pipe 1 of various sizes can be rehabilitated.

(Method for Rehabilitation of Existing Pipes)
Next, a method for rehabilitating the old pipe 1 using the reinforcing member 5 will be described.
First, the reinforcing member 5 is laid on the inner surface of the bottom slab portion 11 of the existing pipe 1 in a water-permeable state.
The first direction (lateral direction) of the reinforcing member 5 is aligned with the axial direction of the existing pipe 1, and the second direction (longitudinal direction) is oriented in the width direction of the inner surface of the bottom plate portion 11. placed on the inner surface of the As a result, the extending direction of the ribs 53 is aligned with the pipe axis direction, so that water flow is not hindered. Further, since the outer plate portion 51 forms a flat surface corresponding to the inner surface of the bottom plate portion 11, the reinforcing member 5 is placed stably.

As shown in FIG. 2, the reinforcing member 5 used here is formed such that the length in the second direction (longitudinal direction) is the same as or slightly smaller than the width of the inner surface of the bottom plate portion 11 . As shown in FIG. 3, a plurality of reinforcing members 5 are connected in series in the pipe axial direction according to the rehabilitation section of the existing pipe 1 .

Subsequently, the rehabilitating pipe 2 is manufactured on the reinforcing member 5 within the existing pipe 1 .
The band-shaped member 20 is imparted with a curl and introduced into the existing pipe 1, and as shown in FIG. In the process, as shown in FIG. 4(A), in the belt-like member 20, the first fitting portion 26 and the second fitting portion 27, the sub-lock piece 28 and the T-rib 25, and the sealing material The joint surface 29 and the sealing material 23c are joined together.

2 and 3, a space S for filling the back-filling material 3 is formed between the existing pipe 1 and the rehabilitating pipe 2 by manufacturing the rehabilitating pipe 2, and the reinforcing member 5 is interposed. there is The rehabilitating pipe 2 may be weighted to prevent it from floating, or it may be provided with a shoring to prevent it from floating and deformation.

Subsequently, after closing the mouth of the space S between the existing pipe 1 and the rehabilitation pipe 2 at both ends of the rehabilitation section, the space S is filled with the backfilling material 3 . The back-filling material 3 can be distributed inside the reinforcing member 5 through a plurality of holes 52 a formed in the inner plate portion 52 of the reinforcing member 5 and a plurality of holes 53 a formed in the rib 53 . Therefore, the space S can be filled with the back-filling material 3 to the smallest details.

The back-filling material 3 adheres to the existing pipe 1, the rehabilitation pipe 2 and the reinforcing member 5 and hardens. As a result, a composite pipe 4 in which the existing pipe 1, the rehabilitation pipe 2, the backfilling material 3 and the reinforcing member 5 are integrated is constructed, and the existing pipe 1 can be rehabilitated.

(Effect of the first embodiment)
According to the above embodiment, the existing pipe 1 is reinforced by increasing the pipe thickness as the composite pipe 4, and the pipe bottom portion of the composite pipe 4 including the bottom slab portion 11 of the existing pipe 1, which was plain concrete, is replaced by the reinforcing member 5 enhances the reinforcing effect. For example, the outer plate portion 51 on the existing pipe 1 side and the inner plate portion 52 on the rehabilitated pipe 2 side further enhance the reinforcing effect against the force acting in the radial direction of the composite pipe 4 .
In addition, the composite pipe 4 with enhanced reinforcing effect can be constructed by securing the reinforcing member 5 and pipe thickness without stopping the flow of water through the existing pipe 1 . Therefore, it is not necessary to provide a bypass pipe.

Next, another embodiment of the present invention will be described. In the following embodiment, only the configuration different from the above embodiment will be described, and the same reference numerals will be given to the same components, and the description thereof will be omitted.

[Second embodiment]
FIG. 5A shows a second embodiment of the invention. In this embodiment, a reinforcing member can be laid on an existing pipe having a curved inner surface at the bottom of the pipe.

The inner surface of the pipe bottom of the existing pipe (not shown, but denoted by reference numeral 1B for convenience of explanation) is a curved surface that curves outward in the pipe radial direction with respect to the pipe axis. The shape of the outer plate portion 51B of the reinforcing member 5B is curved corresponding to the curved surface of the pipe bottom portion of the existing pipe 1B. The shape of the inner plate portion 52B is curved with a curvature smaller than that of the outer plate portion 51B. Therefore, the interval between the outer plate portion 51B and the inner plate portion 52B is formed narrower at both ends than at the center in the second direction. Furthermore, the height of the rib 53B is also different, being higher in the central portion and lower toward both ends. Holes 53a are formed in the ribs 53B other than the lowest rib 53B at both ends. Holes 53a may be formed in ribs 53B on both ends.

According to the second embodiment, the reinforcing member 5B can be stably laid on the bottom portion of the existing pipe 1B having a curved inner surface. Therefore, for example, it can be applied to rehabilitation of existing pipes having a circular or oval cross-sectional shape.

[Modification]
The present invention is not limited to the above-described embodiments, and various modifications can be adopted without departing from the gist of the present invention.
The reinforcing member may also be laid at a portion other than the bottom portion of the existing pipe.
The holes through which the backfilling material can flow may not be formed in the inner plate portion, but may be formed only in the outer plate portion.
Although the shape of the reinforcing member in the above embodiment is such that the second direction is longer than the first direction directed to the pipe axis direction of the existing pipe, the second direction may be formed shorter or the same. .
In the above-described embodiment, the separating portion that secures the interval between the outer plate portion and the inner plate portion is formed by plate-shaped ribs. may be fixed. In this case, it is not necessary to form a hole for circulating the back-filling material in the separation portion.
The cross-sectional shape of the existing pipe may be horseshoe-shaped, circular, oval, or other shapes such as rectangular.

INDUSTRIAL APPLICABILITY The present invention can be applied to a reinforcing member and a method for rehabilitating existing pipes such as aging sewage pipes, agricultural water pipes, water supply pipes, and tunnels.

Reference Signs List 1, 1B Existing pipe 1a Steel pipe 2 Rehabilitation pipe 3 Back-filling material 4 Composite pipe 5, 5B Reinforcing member 11 Bottom slab (pipe bottom)
12 side wall part 13 top plate part 20 belt-like member 21 main belt material 22 reinforcing belt material 23 flat belt part 23a front side surface 23b rear side surface 23c sealing material 23d accommodating part 24, 25 T-rib 26 first fitting part 27 second fitting Part 28 Sub-lock piece 29 Sealing material joint surface 51, 51B Outer plate portion (first plate portion)
52, 52B inner plate portion (second plate portion)
52a hole 53, 53B rib (separation part)
53a Hole S Space between existing pipe and rehabilitation pipe

Claims (6)

A reinforcing member interposed between the existing pipe and the rehabilitation pipe when the composite pipe is constructed by filling the space between the existing pipe on the outside and the rehabilitation pipe on the inside with a backfilling material,
a first plate portion on the existing pipe side;
a second plate portion on the rehabilitation pipe side;
A reinforcing member for a composite pipe, comprising: a separating portion that is provided between the first plate portion and the second plate portion and that secures an interval between the two plate portions. 2. The reinforcing member for a composite pipe according to claim 1, wherein the first plate portion has a shape corresponding to the inner surface shape of the existing pipe. 3. The reinforcing member for a composite pipe according to claim 1, wherein at least one of said first plate portion and said second plate portion is formed with a plurality of holes. The reinforcing member for a composite pipe according to any one of claims 1 to 3, wherein the separating portion is formed of a plate-like rib. 5. The reinforcing member for a composite pipe according to claim 4, wherein a plurality of holes are formed in said plate-like rib. A step of laying the reinforcing member according to any one of claims 1 to 5 inside an existing pipe;
A belt-shaped member is spirally wound to form a rehabilitating pipe inside the existing pipe, the reinforcing member is interposed between the existing pipe and the rehabilitating pipe, and a space for filling a backfilling material is formed. process and
filling a space between the existing pipe and the rehabilitating pipe with a back-filling material to construct a composite pipe.

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