JP2023084117A - Reform pipe and existing pipe reforming method - Google Patents

Abstract

To provide a reform pipe which can secure strength of the reform pipe and be transported in an existing pipe, and to provide an existing pipe reforming method.SOLUTION: A second reform pipe 12 is a pipe for reforming an existing pipe 1 with which an existing branch pipe 2 is connected. The second reform pipe 12 includes a reform main pipe 15 and a branch pipe part 16. The branch pipe part 16 is branched from the reform main pipe 15 and formed having a diameter smaller than that of the reform main pipe 15. Further, an opening end 16c of the branch pipe part 16 is formed in an arc shape centered on a pipe axis 28 in a side view in which the branch pipe part 16 is viewed from a pipe axis direction of the reform main pipe 15.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a rehabilitation pipe and an existing pipe rehabilitation method.

When the existing pipes are deteriorated in underdrain rehabilitation work or open channel conversion work in the sewage and agricultural water fields, new rehabilitation pipes are sequentially inserted into the existing pipes to rehabilitate the existing pipes (for example, sheath pipe construction method) is known.

According to this type of rehabilitation method, for example, as disclosed in Patent Document 1, vertical shafts (vertical holes) are provided upstream and downstream of a portion to be repaired of an existing pipe, and a rehabilitation pipe is installed from one of the vertical shafts. Suspend down the tube one by one. Next, after the rehabilitated pipe is lifted up by the jack of the transport truck installed in the shaft, the rehabilitated pipe is transported (transported) into the existing pipe using a pipe transport battery car or the like. At the transport destination, connect the socket of the rehabilitating pipe to the spigot of another rehabilitating pipe. By sequentially repeating this connection work, a plurality of rehabilitating pipes are connected over the entire section between the departure-side shaft and the arrival-side shaft, and a plurality of rehabilitating pipes are constructed within the existing pipe. Also, the gaps between the existing pipe and the plurality of rehabilitation pipes are filled with a back-filling material such as mortar to integrally fix the plurality of rehabilitation pipes within the existing pipe.

Here, if the existing pipe is provided with an existing branch pipe (existing inflow pipe portion) connected to the rehabilitating pipe, a mounting hole is drilled in the rehabilitating pipe. After drilling the mounting holes, the connecting pipe (connecting pipe) is carried inside the rehabilitating pipe. The connecting pipe brought in is inserted into the mounting hole from the inside of the rehabilitating pipe and protruded outside. Furthermore, the connection pipe protruding outside the rehabilitation pipe is connected to the existing branch pipe. As a result, the existing branch pipe communicates with the interior of the rehabilitating pipe via the connecting pipe. In this state, the gap between the mounting hole and the connecting pipe is filled with resin mortar (epoxy resin-based two-component bonding agent) to fix the connecting pipe.

JP 2013-50203 A

Here, the conventional rehabilitation method is a method of inserting a connection pipe into a mounting hole drilled in a rehabilitation pipe and connecting the inserted connection pipe to an existing branch pipe.
However, in this method, the strength of the rehabilitated pipe may be affected when a mounting hole is drilled in the rehabilitated pipe.

As a countermeasure, for example, it is conceivable to connect a connecting pipe to the mounting hole of the rehabilitating pipe in advance and reinforce the rehabilitating pipe with the connecting pipe. However, when the connecting pipe is connected in advance to the mounting hole of the rehabilitating pipe, the connecting pipe largely protrudes (overhangs) from the outer peripheral wall of the rehabilitating pipe. Therefore, when the rehabilitating pipe is transported into the pipeline, the connecting pipe interferes with the existing pipe, making it difficult to transport the rehabilitating pipe to the connection position of the existing branch pipe.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rehabilitated pipe and a method for rehabilitating an existing pipe that can secure the strength of the rehabilitated pipe and transport the rehabilitated pipe within the existing pipe. .

In order to solve the above problems, the present invention proposes the following means.
"1" A rehabilitated pipe according to the present invention is a rehabilitated pipe for rehabilitating an existing pipe to which an existing branch pipe is connected, comprising a main rehabilitated pipe and a main rehabilitated pipe branched from the main rehabilitated pipe and having a smaller diameter than the main rehabilitated pipe. and a branch pipe portion, and in a side view of the branch pipe portion viewed from the pipe axis direction of the rehabilitation main pipe, the opening end of the branch pipe portion has an arc shape centered on the pipe axis.

In the case of the rehabilitating pipe described above, the rehabilitating main pipe is provided with the branch pipe portion, and the branch pipe portion is branched from the rehabilitating main pipe. Therefore, the connecting pipe can be inserted into the branch pipe portion from the inside of the rehabilitating pipe, and the connecting pipe can be connected to the existing branch pipe. In this way, by providing the branch pipe portion in the rehabilitating main pipe, the concern about the strength of the rehabilitating pipe in the mounting hole, which was a concern in the prior art, is eliminated. That is, by providing the branch pipe portion in the rehabilitation main pipe, the rehabilitation main pipe can be reinforced by the branch pipe portion, and the strength of the rehabilitation pipe can be ensured, for example, even when the diameter of the mounting hole is large.

Furthermore, the opening end of the branch pipe portion was formed in an arc shape centering on the pipe axis of the main rehabilitation pipe. Therefore, the opening end of the branch pipe portion can be formed along the outer peripheral wall of the rehabilitation main pipe. As a result, the opening end of the branch pipe portion can be prevented from protruding greatly from the outer peripheral wall of the rehabilitation main pipe, and the amount of protrusion of the branch pipe portion can be minimized. Therefore, for example, even in a narrow existing pipe, the rehabilitated pipe can be conveyed (transported) to the connection position of the existing branch pipe (existing inflow pipe) without causing the branch pipe portion to interfere with the existing pipe.

[2] In the present embodiment, the rehabilitating pipe according to [1] may be used, wherein the diameter of the branch pipe portion is 500 mm or more.

Here, for example, when the diameter of the branch pipe portion is 500 mm or more, the attachment hole of the rehabilitation main pipe into which the connection pipe is inserted becomes large. Therefore, the possibility of affecting the strength of the rehabilitated pipe increases. Therefore, the rehabilitation main pipe is provided with a branch pipe portion, and the connecting pipe is inserted into the branch pipe portion. As a result, when the diameter of the branch pipe portion is 500 mm or more, it becomes possible to apply the rehabilitated pipe, and the use of the rehabilitated pipe can be expanded.

"3" In this embodiment, the rehabilitation pipe according to "1" or "2" may be used, wherein the rehabilitation pipe and the branch pipe are made of fiber-reinforced plastic.

In this case, the strength of the rehabilitated main pipe and the branch pipe can be increased by making the rehabilitated main pipe and the branch pipe from fiber-reinforced plastic. As a result, the strength of the rehabilitated pipe can be secured more favorably.

"4" In this embodiment, the main rehabilitation pipe and the branch pipe part are separate members and are bonded with a sheet material. good.

In this case, the main rehabilitated pipe and the branch pipe portions were composed of separate members, and the rehabilitated main pipe and the branch pipe portions were bonded with a sheet material. Therefore, it is possible to reinforce the attachment hole that communicates the branch pipe portion with the rehabilitation main pipe with the sheet material. Furthermore, the branch pipe can be firmly fixed to the rehabilitated main pipe with the sheet material, and the rehabilitated main pipe and the branch pipe can be integrated. As a result, the strength of the rehabilitated pipe can be secured more favorably.

[5] In this embodiment, the rehabilitating pipe according to any one of [1] to [4] may be provided, in which a guide part is attached to the connection port of the existing branch pipe.

In this case, for example, the pipe can be easily connected to the connection port of the existing branch pipe by the guide portion.

"6" A method for rehabilitating an existing pipe according to the present invention is a method for rehabilitating an existing pipe to which an existing branch pipe is connected using the rehabilitating pipe according to any one of "1" to "5", A conveying step of conveying a rehabilitating pipe within the existing pipe, and a connecting step of inserting a connecting pipe from the inside of the rehabilitating pipe into the branch pipe portion and connecting the connecting pipe to the existing branch pipe.

In the above-described method for rehabilitating an existing pipe, the opening end of the branch pipe portion of the rehabilitating pipe is formed in an arc shape centering on the pipe axis of the rehabilitating main pipe. Therefore, the opening end of the branch pipe portion can be formed along the outer peripheral wall of the rehabilitation main pipe. As a result, the opening end of the branch pipe portion can be prevented from protruding greatly from the outer peripheral wall of the rehabilitation main pipe, and the amount of protrusion of the branch pipe portion can be minimized.
Therefore, when the rehabilitated pipe is transported in the existing pipe in the transport process, the rehabilitated pipe can be transported to the connection position of the existing branch pipe without causing the branch pipe portion to interfere with the existing pipe, for example, even in a narrow existing pipe.

Further, the rehabilitation pipe has a branch pipe portion branched from the rehabilitation main pipe. Therefore, in the connecting step, the connecting pipe can be inserted into the branch pipe portion from the inside of the rehabilitating pipe, and the connecting pipe can be connected to the existing branch pipe. In this way, by providing the branch pipe portion in the rehabilitating main pipe, the concern about the strength of the rehabilitating pipe when the diameter of the attachment hole is large, which has been a concern in the prior art, is eliminated. That is, by providing the branch pipe portion in the rehabilitation main pipe, the rehabilitation main pipe can be reinforced by the branch pipe portion, and the strength of the rehabilitation pipe can be ensured even when the diameter of the mounting hole is large.

"7" Rehabilitation of an existing rehabilitated pipe according to "6", wherein in the present embodiment, the rehabilitated pipe is rotated around the pipe axis during the transporting step or between the transporting step and the connecting step. It can be a method.

In this case, the rehabilitating pipe is rotated around the pipe axis during the transporting process or between the transporting process and the connecting process. Therefore, when the rehabilitated pipe is transported to the connection position of the existing branch pipe, the branch pipe part is placed at a position where it does not interfere with the existing branch pipe and is transported to the connection position. After transporting the rehabilitating pipe to the connection position, the rehabilitating pipe can be rotated around the pipe axis, for example, to align the branch pipe portion with the existing branch pipe in the vertical direction (height direction). As a result, for example, even in a narrow existing pipe, the rehabilitated pipe can be conveyed to the connection position of the existing branch pipe and connected to the existing branch pipe without causing the branch pipe portion to interfere with the existing pipe.

[8] The method for rehabilitating an existing pipe according to [6] or [7], further comprising, before the connecting step, a step of attaching a guide portion to the connection port of the existing branch pipe. may

In this case, for example, the pipe can be easily connected to the connection port of the existing branch pipe by the guide portion.

According to the present invention, the strength of the rehabilitated pipe can be ensured, and the rehabilitated pipe can be transported within the existing pipe.

FIG. 3 is an explanatory view showing one step of the method for rehabilitating an existing pipe according to the first embodiment of the present invention; FIG. 4 is a plan view showing a state in which a plurality of rehabilitating pipes are continuously arranged on the existing pipe of the first embodiment; FIG. 4 is a cross-sectional view showing a state in which the first rehabilitating pipe of the first embodiment is laid inside the existing pipe; Fig. 4 is a cross-sectional view showing a state in which a second rehabilitated pipe of the first embodiment is laid inside an existing pipe; FIG. 5 is an enlarged cross-sectional view of a V portion of FIG. 4; FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5; It is the side view which looked at the state which fixed the connection pipe inserted in the branch pipe part of 1st Embodiment from the inside of the 2nd rehabilitating pipe. It is a side view which shows the 2nd rehabilitation pipe of 1st Embodiment. FIG. 9 is a cross-sectional view taken along line IX-IX of FIG. 8; FIG. 5 is a cross-sectional view for explaining positions where branch pipe portions are arranged when the first rehabilitating pipe of the first embodiment is conveyed. FIG. 7 is a cross-sectional view showing a state in which a second rehabilitated pipe according to a second embodiment of the present invention is laid inside an existing pipe. FIG. 11 is a perspective view of a plate-like member before being processed into a guide portion according to the second embodiment; FIG. 4 is a perspective view showing an example of processing a plate-like member; FIG. 4 is a perspective view showing an example of processing a plate-like member; It is a side view which shows the 2nd rehabilitating pipe of 2nd Embodiment. FIG. 16 is a cross-sectional view taken along line XV-XV of FIG. 15; It is sectional drawing which expanded the principal part of the 1st modification of 2nd Embodiment which concerns on this invention. It is sectional drawing which expanded the principal part of the 2nd modification of 2nd Embodiment which concerns on this invention. It is sectional drawing which expanded the principal part of the 3rd modification of 2nd Embodiment which concerns on this invention.

Hereinafter, a rehabilitating pipe and a method for rehabilitating an existing pipe according to an embodiment of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1 is an explanatory diagram showing one step of a method for rehabilitating an existing pipe according to a first embodiment of the present invention. FIG. 2 is a plan view showing a state in which a plurality of rehabilitating pipes are continuously arranged on the existing pipe of the first embodiment.
As shown in FIGS. 1 and 2, prior to describing the method for rehabilitating an existing pipe 1, an outline of a rehabilitating pipe 10 used in the method for rehabilitating an existing pipe will be described. The rehabilitated pipe 10 includes, for example, a first rehabilitated pipe 11 having a standard shape, a second rehabilitated pipe 12 having a branch pipe portion 16, which will be described later, and a third rehabilitated pipe (regulating pipe) 13 for adjustment. there is

The first rehabilitation pipe 11 is, for example, a fiber-reinforced plastic pipe formed in a straight (cylindrical) shape having a constant inner and outer diameter, and has a socket 11a and a spigot 11b. The socket 11 a is provided at one end of the first rehabilitation pipe 11 and has an inner diameter corresponding to the outer diameter of the first rehabilitation pipe 11 . The spigot 11b is formed at the other end of the first rehabilitation pipe 11 so as to have a tapered surface that gradually becomes thinner toward the outside.

As will be described later, the first rehabilitated pipe 11 is successively transported (transported) in the direction of the arrow A into the existing pipe 1 and arranged in the longitudinal direction of the pipe axis. The forward direction in the direction of the pipe axis refers to the transport direction of the first rehabilitated pipe 11 (direction of arrow A), and the backward direction in the direction of the pipe axis refers to the opposite direction to the transport direction of the first rehabilitated pipe 11 .
In a state in which the first rehabilitating pipes 11 are continuously transported into the existing pipe 1, the adjacent first rehabilitating pipes 11 are inserted into the socket 11a of one of the first rehabilitating pipes 11 of the other first rehabilitating pipe 11. It is connected by inserting it into the port 11b. Hereinafter, the direction of each pipe axis of the first rehabilitated pipe 11, the second rehabilitated pipe 12, and the third rehabilitated pipe 13 may be referred to as "pipe axis direction".

The first rehabilitating pipe 11 is provided with a waterproof rubber (not shown) on the inner peripheral surface of the socket 11a or the outer peripheral surface of the spigot 11b. As a result, by inserting and connecting the spigot 11b of the other first rehabilitation pipe 11 to the socket 11a of the first rehabilitation pipe 11, the socket 11a and the spigot 11b can be sealed via the waterproof rubber. is possible.

The second rehabilitated pipe 12 is the first rehabilitated pipe 11 provided with a branch pipe portion 16 , and the rest of the structure is the same as that of the first rehabilitated pipe 11 . The branch pipe portion 16 of the second rehabilitation pipe 12 is arranged at a connection position of the existing branch pipe (existing inflow pipe) 2 . The branch pipe portion 16 protrudes from the outer peripheral wall of the rehabilitation main pipe 15 of the second rehabilitation pipe 12 . The branch pipe portion 16 is formed in a cylindrical shape and communicates with the inside of the second rehabilitation pipe 12 .
With the second rehabilitation pipe 12 arranged at the connection position, the connection pipe (connection pipe) 5 is inserted into the branch pipe portion 16 from the inside of the second rehabilitation pipe 12 . The connection pipe 5 is protruded from the branch pipe portion 16 and connected (inserted) to the existing branch pipe 2 . The existing branch pipe 2 is provided on the existing pipe 1 . Note that the second rehabilitation pipe 12 will be described later in detail.

The third rehabilitated pipe 13 is, for example, formed to have a spigot length longer than that of the first rehabilitated pipe 11 , and the other shapes are the same as those of the first rehabilitated pipe 11 . The third rehabilitation pipe 13 is interposed, for example, between the first rehabilitation pipe 11 and the second rehabilitation pipe 12 in the pipe axial direction so that the branch pipe portion 16 of the second rehabilitation pipe 12 is arranged at the connecting position. That is, the third rehabilitation pipe 13 is an adjusting pipe for adjusting the position of the branch pipe portion 16 so that the branch pipe portion 16 of the second rehabilitation pipe 12 is aligned with the connection position. For example, the length of the third rehabilitation pipe 13 (for example, the length of the spigot 13b) may be adjusted by cutting the third rehabilitation pipe 13 outside the existing pipe 1 . Further, the third rehabilitation pipe 13 may be omitted, and the rehabilitation pipe 10 may be formed of two types of pipes, the first rehabilitation pipe 11 and the second rehabilitation pipe 12 .

Next, a method for rehabilitating an existing pipe according to an embodiment will be described with reference to FIGS. 1 to 7. FIG. An existing branch pipe 2 is connected to the existing pipe 1 to be rehabilitated. The existing branch pipe 2 is connected to the branch pipe portion 16 of the second rehabilitation pipe 12 when the existing pipe 1 is rehabilitated.
First, at a portion to be repaired in the existing pipe 1, for example, a shaft (vertical hole) M is excavated at the end of the construction section. Here, the existing pipe 1 has a rectangular opening 7 (see FIG. 6) formed at a portion to which the existing branch pipe 2 is connected. In this state, in the pre-process of transporting the first rehabilitated pipe 11, the second rehabilitated pipe 12, and the third rehabilitated pipe 13 into the inside of the existing pipe 1, for example, both side walls and the bottom of the opening 7 are cut off to form a concave portion. 8 (see FIG. 6).

Next, the first rehabilitation pipe 11 is carried into the vertical shaft M and transported from the vertical shaft M toward the construction section of the existing pipe 1 . Specifically, the first rehabilitating pipes 11 are lowered into the pit M in sequence so that the spigots 11b face the conveying direction. Next, the first rehabilitation pipe 11 is installed on a carriage (not shown). The carrier can transport the rehabilitated pipe 10 (that is, the first rehabilitated pipe 11, the second rehabilitated pipe 12, and the third rehabilitated pipe 13) while supporting the rehabilitated pipe 10, and the rehabilitated pipe 10 can be transported along the pipe axis. A trolley that can rotate around.
For example, a battery car (not shown) is connected to the carriage. The first rehabilitation pipe 11 is transported to the construction section in the existing pipe 1 using a battery car and a carrier.

FIG. 3 is a cross-sectional view showing a state in which the first rehabilitating pipe of the first embodiment is laid inside the existing pipe.
As shown in FIG. 3, a pedestal (not shown) is installed between the transported first rehabilitated pipe 11 and the pipe bottom portion 1a of the existing pipe 1 . In addition, a surfacing prevention material (not shown) is arranged on the outer peripheral surface of the substantially upper half of the first rehabilitated pipe 11 including the pipe top portion 11c (see also FIG. 1). For example, the anti-floating material may be an arc-shaped plate member curved to have an inner diameter corresponding to the outer diameter of the socket 11 a of the first rehabilitation pipe 11 . As a result, the first rehabilitating pipe 11 can be supported and fixed so that the axis thereof substantially coincides with the axis of the existing pipe 1 .

Returning to FIGS. 1 and 2, after supporting and fixing the leading first rehabilitation pipe 11 at a predetermined position in the construction section, the battery car and the carriage are recovered in the shaft M. As shown in FIG. Next, in the pit M, the first rehabilitation pipes 11 are lowered in order and supported by a carrier. After that, the first rehabilitation pipe 11 is transported to the construction section using a battery car and a transport truck, and the spigot 11b of the first rehabilitation pipe 11 is inserted into the socket 11a of the first rehabilitation pipe 11 at the top and connected.
After the succeeding first rehabilitated pipe 11 is connected to the leading first rehabilitated pipe 11 , a pedestal is installed on the pipe bottom portion 1 a of the existing pipe 1 corresponding to the succeeding first rehabilitated pipe 11 . Further, a floating prevention material is placed on the outer peripheral surface of the first rehabilitated pipe 11 , and the first rehabilitated pipe 11 is supported and fixed so that the axis thereof substantially coincides with the axis of the existing pipe 1 .

Similarly, in the shaft M, the number of first rehabilitation pipes 11 required for rehabilitation of the existing pipes 1 is lowered, and the first rehabilitation pipes 11 are laid in the construction section. After that, the second rehabilitation pipe 12 is installed corresponding to the existing branch pipe 2, as will be described later. Here, if the last one of the plurality of first rehabilitation pipes 11 is installed, the second rehabilitation pipe 12 is displaced from the existing branch pipe 2 in the axial direction. In that case, for example, instead of the last one first rehabilitation pipe 11, a third rehabilitation pipe 13 can be adopted. In this embodiment, it is assumed that the third rehabilitation pipe 13 is employed, but as described above, the third rehabilitation pipe 13 may be omitted.

Next, each step (first step, second step (conveying step), and third step ( The connection step)) will be described in detail with reference to FIGS. 1, 2 and 4 to 7. FIG.
First, as shown in FIGS. 1 and 2, in the first step after laying the first rehabilitation pipe 11 and the third rehabilitation pipe 13 in the construction section, the spigot 12b of the second rehabilitation pipe 12 faces the conveying direction. It is carried into the pit M by hanging it down like this. This completes the first step.

Next, in the second step, the second rehabilitated pipe 12 that has been brought in is transported from the shaft M into the existing pipe 1 to a laying position in the construction section in the existing pipe 1 using a battery car and a carrier. Here, the carriage is, for example, a carriage that can transport the second rehabilitated pipe 12 while supporting the second rehabilitated pipe 12 and that can rotate the second rehabilitated pipe 12 around the pipe axis. Therefore, after conveying the second rehabilitated pipe 12 to the laying position, in the rotation step, the second rehabilitated pipe 12 is rotated around the pipe axis to rotate the branch pipe portion 16 (described later) to the connection position of the existing branch pipe 2. can be aligned in the vertical direction (height direction).
The reason for rotating the second rehabilitation pipe 12 will be described later in detail.

In this state, the spigot 12b of the second rehabilitation pipe 12 is inserted into the socket 13a of the third rehabilitation pipe 13 and connected. The third rehabilitation pipe 13 is an adjustment pipe for adjusting the position of the branch pipe portion 16 so that the branch pipe portion 16 of the second rehabilitation pipe 12 is aligned with the connection position.
Therefore, by inserting the spigot 12b of the second rehabilitation pipe 12 into the socket 13a of the third rehabilitation pipe 13 and connecting the second rehabilitation pipe 12 to the third rehabilitation pipe 13, the branch pipe portion of the second rehabilitation pipe 12 16 is aligned with the connection position of the existing branch pipe 2 in the pipe axial direction. This completes the second step.

Next, an example of connecting the branch pipe portion 16 of the second rehabilitation pipe 12 to the existing branch pipe 2 in the third step will be described with reference to FIGS. 2 and 4 to 7. FIG.
FIG. 4 is a cross-sectional view showing a state in which the second rehabilitated pipe of the first embodiment is laid inside the existing pipe. FIG. 5 is a cross-sectional view enlarging the V portion of FIG.

As shown in FIGS. 4 and 5, in the third step, the branch pipe portion 16 of the second rehabilitation pipe 12 is aligned with the connection position of the existing branch pipe 2 in the pipe axial direction and the vertical direction (height direction). be done. In this state, an anti-floating material (not shown) is placed on the outer peripheral surface of the substantially upper half of the second rehabilitated pipe 12 including the pipe top portion 12c. As a result, the second rehabilitated pipe 12 can be supported so that the axis thereof substantially coincides with the axis of the existing pipe 1, and the second rehabilitated pipe 12 can be fixed in a state in which the floating of the second rehabilitated pipe 12 is prevented. .
In this state, the connection pipe 5 is inserted from the inside of the second rehabilitation pipe 12 into the inside of the branch pipe portion 16 . The inserted connection pipe 5 is projected from the branch pipe part 16 and inserted into the existing branch pipe 2 for connection. As the connection pipe 5, for example, a pipe made of fiber-reinforced plastic or a pipe made of vinyl chloride is used.

FIG. 6 is a cross-sectional view taken along line VI-VI of FIG.
As shown in FIGS. 5 and 6, a rectangular opening 7 is formed in a portion of the existing pipe 1 to which the existing branch pipe 2 is connected. As described above, the opening 7 is formed by, for example, cutting off both side walls and the bottom in the process prior to transporting the first rehabilitating pipe 11, the second rehabilitating pipe 12, and the third rehabilitating pipe 13 into the existing pipe 1. An interpolation process is performed to form the recess 8 .
By forming the recess 8 in the opening 7 , one end 5 a of the connecting pipe 5 can be inserted into the opening 7 . By inserting one end 5 a of the connecting pipe 5 into the opening 7 , the connecting pipe 5 and the existing branch pipe 2 are aligned. In this state, a rectangular timber or the like is driven into the gap between the connecting pipe 5 and the branch pipe portion 16 to temporarily fix the connecting pipe 5 coaxially with the existing branch pipe 2 .

With the connecting pipe 5 temporarily fixed coaxially with the existing branch pipe 2, the gap between the one end 5a of the connecting pipe 5 and the opening 7 is filled with resin mortar (epoxy resin-based two-liquid bonding agent) 22. . Therefore, the joint between the one end 5a of the connection pipe 5 and the opening 7 is closed, and the connection pipe 5 is integrated with the existing pipe 1 in a connected state. As a result, the connection pipe 5 is fixed in a state of coaxial communication with the existing branch pipe 2 .

FIG. 7 is a side view of the state in which the connecting pipe inserted into the branch pipe portion of the first embodiment is fixed, viewed from the inside of the second rehabilitating pipe.
As shown in FIGS. 5 and 7, the surplus length of the connecting pipe 5 projecting inside the second rehabilitation pipe 12 is cut off. The connection pipe 5 is preferably cut along the curvature of the inner surface of the second rehabilitation pipe 12 in a curved shape. After cutting off the excess length of the connecting pipe 5, while removing the squared material etc. from the gap between the connecting pipe 5 and the branch pipe portion 16, the other end 5b of the connecting pipe 5 and the branch pipe portion 16 (specifically, fills resin mortar (epoxy resin-based two-liquid type bonding agent) 24 in the gap between the second FRP sheet 18) described later. Therefore, the other end 5b of the connection pipe 5 and the branch pipe portion 16 are jointed with the resin mortar 24, and the connection pipe 5 is integrated with the branch pipe portion 16 in a connected state. In this state, the second rehabilitation pipe 12 communicates with the existing branch pipe 2 via the connecting pipe 5 . That is, the running water from the existing branch pipe 2 can be guided to the second rehabilitation pipe 12 through the connecting pipe 5 . As a result, the rehabilitation of the existing pipe 1 using the second rehabilitation pipe 12 in the third step is completed.

The method for rehabilitating an existing pipe described above is sequentially repeated to transport the second rehabilitated pipe to each connection position and connect it to the existing branch pipe. In the process after connecting the plurality of second rehabilitation pipes to the respective existing branch pipes, the plurality of rehabilitation pipes 10 in the construction section (that is, the first rehabilitation pipe 11, the second rehabilitation pipe 12, the third rehabilitation pipe 13) and The existing pipe 1 is partitioned by installing partition walls at predetermined distances. A back-filling material is driven into the gap between the partitioned inner peripheral surface of the existing pipe 1 and the outer peripheral surface of the rehabilitating pipe 10 using, for example, grout holes formed in the rehabilitating pipe 10 .
Air mortar, for example, can be used as the backfilling material. The back-filling material filling operation is repeated for each fixed section of the rehabilitation pipe 10 and the existing pipe 1, and the back-filling material is sequentially placed over the entire construction section. Therefore, the rehabilitation pipe 10 can be integrally fixed to the existing pipe 1 . Thus, the rehabilitation process for the existing pipe 1 is completed.

When the backfilling material is driven, the anti-floating material attached to each rehabilitation pipe 10 maintains the gap between the existing pipe 1 and the rehabilitation pipe 10, and acts so that the rehabilitation pipe 10 does not float. As a result, the backfilling material can be driven smoothly.

Next, the second rehabilitating pipe 12 according to the first embodiment will be described with reference to FIGS. 5, 8 and 9. FIG. FIG. 8 is a side view showing the second rehabilitating pipe of the first embodiment. 9 is a cross-sectional view taken along line IX-IX of FIG. 8. FIG.
As shown in FIGS. 5, 8, and 9, the second rehabilitation pipe 12 includes a rehabilitation main pipe 15, a branch pipe portion 16, a first FRP sheet (FRP sheet, sheet material) 17, and a second FRP sheet (FRP sheet, sheet material) 18;
The main rehabilitation pipe 15 is formed by opening (drilling) a mounting hole 26 in the first rehabilitation pipe 11 , and other shapes are formed in the same manner as the first rehabilitation pipe 11 . That is, the rehabilitation main pipe 15 is, for example, a fiber-reinforced plastic pipe formed in a straight pipe shape (cylindrical shape) having a constant inner and outer diameter. The rehabilitation main pipe 15 has a socket 12 a , a spigot 12 b , and a mounting hole 26 .

The socket 12 a is provided at one end of the main rehabilitation pipe 15 and has an inner diameter corresponding to the outer diameter of the second rehabilitation pipe 12 . The spigot 12b is ground (made thin) with a constant width over the entire outer circumference at the other end of the rehabilitating main pipe 15 . The main rehabilitated pipe 15 (that is, the second rehabilitated pipe 12) is conveyed into the existing pipe 1, for example, at the socket 13a (see Figs. 1 and 2) of the third rehabilitated pipe 13 adjacent in the pipe axial direction (see Figs. 3 If there is no rehabilitation pipe 13, it is connected by inserting the spigot 12b into the receptacle 11a) of the first rehabilitation pipe 11.
The rehabilitation main pipe 15 is provided with a waterproof rubber (not shown) on the inner peripheral surface of the socket 12a or the outer peripheral surface of the spigot 12b. As a result, for example, by inserting and connecting the spigot 12b of the main rehabilitation pipe 15 to the socket 13a of the third rehabilitation pipe 13 (or the socket 11a of the first rehabilitation pipe 11), the plug can be inserted through the waterproof rubber. The port 12b and the receptacle 13a are sealed.

A mounting hole 26 is provided in the outer peripheral wall of the rehabilitation main pipe 15 . The mounting hole 26 is positioned, for example, in the center of the pipe axis direction in a side view of the rehabilitation main pipe 15 (the side view shown in FIG. 8), and a distance H1 below the pipe axis 28. A circular opening is provided around the eccentric position. The mounting hole 26 has a diameter of, for example, 500 mm or more in a side view of the rehabilitation main pipe 15 . The branch pipe portion 16 is connected to the periphery of the mounting hole 26 (that is, the outer wall of the rehabilitation main pipe 15).

The branch pipe portion 16 is attached, for example, at the center in the pipe axial direction in a side view of the main rehabilitating pipe 15, and at a position eccentric downward by a distance H1 with respect to the pipe axis 28. It is formed in a cylindrical shape coaxially with the hole 26 . The branch pipe portion 16 has a proximal end connected to the peripheral edge of the mounting hole 26 in the outer wall of the main rehabilitation pipe 15 . That is, the branch pipe portion 16 branches outward from the rehabilitation main pipe 15 . The branch pipe portion 16 is a pipe made of fiber-reinforced plastic, like the rehabilitation main pipe 15 . By making the rehabilitation main pipe 15 and the branch pipe portions 16 made of fiber-reinforced plastic, the strength of the rehabilitation main pipe 15 and the branch pipe portions 16 can be increased.

In addition, the branch pipe portion 16 has an inner peripheral wall 16 b that is flush with the mounting hole 26 when viewed from the side of the rehabilitation main pipe 15 . Further, the branch pipe portion 16 is formed to have a diameter (inner diameter) of 500 mm or more, and is formed to have a diameter smaller than that of the rehabilitation main pipe 15 . Therefore, the existing branch pipe 2 to which the branch pipe portion 16 is connected is also formed to have a diameter of 500 mm or more.
In the first embodiment, as an example, the rehabilitation main pipe 15 is formed with a diameter of 1650 mm, and the branch pipe portion 16 is formed with a diameter of 1000 mm. The diameter of the rehabilitation main pipe 15 and the diameter of the branch pipe portion 16 can be arbitrarily selected.

In addition, the branch pipe portion 16 has an opening end 16c formed in an arc shape centering on the pipe axis 28 in a side view (side view shown in FIG. 9) seen from the pipe axis direction of the main rehabilitation pipe 15. . Therefore, the opening end 16 c of the branch pipe portion 16 can be formed along the outer peripheral wall of the rehabilitation main pipe 15 . This prevents the opening end 16 c of the branch pipe portion 16 from protruding significantly from the outer peripheral wall of the main rehabilitation pipe 15 .
The reason why the opening end 16c of the branch pipe portion 16 is formed in an arc shape so as not to overhang the outer peripheral wall of the rehabilitation main pipe 15 will be described later in detail.

A first FRP sheet 17 is adhered with resin (not shown) around the attachment hole 26 of the outer peripheral wall of the branch pipe portion 16 and the outer peripheral wall of the rehabilitated main pipe 15 . The first FRP sheet 17 is a sheet made of fiber reinforced plastics. A second FRP sheet 18 is bonded with resin (not shown) around the mounting hole 26 of the inner peripheral wall of the branch pipe portion 16 and the inner peripheral wall of the main pipe 15 to be rehabilitated. The second FRP sheet 18 is a sheet made of fiber reinforced plastics.
That is, the rehabilitated main pipe 15 and the branch pipe portion 16, which are separate members, are integrally bonded with the first FRP sheet 17 and the second FRP sheet 18. As shown in FIG.

Here, the reason why the opening end 16c of the branch pipe portion 16 is formed in an arc shape so as not to overhang the outer peripheral wall of the rehabilitation main pipe 15 will be described with reference to FIGS. 4, 9 and 10. FIG.
As shown in FIGS. 4 and 9, when the branch pipe portion 16 of the second rehabilitation pipe 12 is connected to the existing branch pipe 2 of the existing pipe 1, the branch pipe portion 16 is positioned below the second rehabilitation pipe 12. placed. Therefore, when the second rehabilitated pipe 12 is transported, for example, the branch pipe portion 16 may interfere with the pipe bottom portion 1a of the existing pipe 1 . Therefore, in the rotation process in the middle of the second process, the second rehabilitated pipe 12 is rotated around the pipe axis.

FIG. 10 is a cross-sectional view for explaining positions where branch pipe portions are arranged when the first rehabilitated pipe of the first embodiment is conveyed.
As shown in FIGS. 4 and 10, when the second rehabilitating pipe 12 is rotated around the pipe axis in the direction of arrow B shown in FIG. 4, the branch pipe portion 16 moves upward. As a result, the branch pipe portion 16 can be separated upward from the pipe bottom portion 1a of the existing pipe 1 so as to face the pipe side wall 1b of the existing pipe 1 . The pipe side wall 1 b of the existing pipe 1 is arranged with a relatively large gap from the outer peripheral wall of the rehabilitation main pipe 15 . Therefore, by making the branch pipe portion 16 face the pipe side wall 1b of the existing pipe 1, the branch pipe portion 16 interferes with the existing pipe 1 when the second rehabilitation pipe 12 is transported to the connection position of the existing branch pipe 2. can be prevented.

Furthermore, after transporting the second rehabilitating pipe 12 to the connection position of the existing branch pipe 2, when the second rehabilitating pipe 12 is rotated around the pipe axis in the direction of arrow C shown in FIG. 10, the branch pipe portion 16 moves downward. do. Thereby, the branch pipe portion 16 of the second rehabilitation pipe 12 can be vertically aligned with the existing branch pipe 2 .
Therefore, for example, even when regenerating a narrow existing pipe 1 , the second rehabilitated pipe 12 can be transported to the connection position of the existing branch pipe 2 without causing the branch pipe portion 16 to interfere with the existing pipe 1 .
Furthermore, after the second rehabilitation pipe 12 is conveyed to the connection position of the existing branch pipe 2, the branch pipe portion 16 is aligned in the vertical direction with respect to the existing branch pipe 2, so that the connecting pipe inserted into the branch pipe portion 16 5 can be inserted into the existing branch pipe 2 for connection.

As described above, according to the second rehabilitating pipe 12 of the first embodiment, as shown in FIGS. It was branched from the rehabilitation main pipe 15 . Therefore, the connection pipe 5 can be inserted into the branch pipe portion 16 from the inside of the second rehabilitation pipe 12, and the connection pipe 5 can be inserted into the existing branch pipe 2 for connection. By providing the branch pipe portion 16 in the main rehabilitation pipe 15 in this manner, the concern about the strength of the second rehabilitation pipe 12 when the diameter of the attachment hole 26 is large, which has been a concern in the prior art, is eliminated. That is, by providing the branch pipe portion 16 in the main rehabilitation pipe 15, the main rehabilitation pipe 15 can be reinforced by the branch pipe portion 16, and the strength of the second rehabilitation pipe 12 can be ensured even when the mounting hole 26 has a large diameter.

Further, the opening end 16c of the branch pipe portion 16 is formed in an arc shape around the pipe axis 28 of the main rehabilitation pipe 15. As shown in FIG. Therefore, the opening end 16 c of the branch pipe portion 16 can be formed along the outer peripheral wall of the rehabilitation main pipe 15 . As a result, the opening end 16c of the branch pipe portion 16 can be prevented from protruding greatly from the outer peripheral wall of the rehabilitation main pipe 15, and the amount of protrusion of the branch pipe portion 16 can be minimized. Therefore, for example, the second rehabilitated pipe 12 can be transported to the connection position of the existing branch pipe 2 without causing the branch pipe portion 16 to interfere with the existing pipe 1 even inside the narrow existing pipe 1 .

Here, for example, when the diameter of the branch pipe portion 16 is 500 mm or more, the attachment hole 26 of the rehabilitation main pipe 15 into which the connection pipe 5 is inserted becomes large. Therefore, the strength of the main rehabilitation pipe 15 (that is, the second rehabilitation pipe 12) may be affected. Therefore, the attachment hole 26 of the rehabilitation main pipe 15 is provided with the branch pipe portion 16 , and the connecting pipe 5 is inserted into the attachment hole 26 and the branch pipe portion 16 . As a result, even when the diameter of the branch pipe portion 16 is 500 mm or more, the second rehabilitating pipe 12 can be applied, and the applications of the second rehabilitating pipe 12 can be expanded.

In addition, the strength of the rehabilitated main pipe 15 and the branch pipe portions 16 can be increased by making the rehabilitated main pipe 15 and the branch pipe portions 16 from fiber-reinforced plastic. Thereby, the strength of the second rehabilitation pipe 12 can be more preferably secured.

Furthermore, the main rehabilitation pipe 15 and the branch pipe portions 16 are formed of separate members, and the main rehabilitation pipe 15 and the branch pipe portions 16 are bonded with the first FRP sheet 17 and the second FRP sheet 18 . Therefore, the attachment hole 26 that communicates the branch pipe portion 16 with the rehabilitation main pipe 15 can be reinforced with the first FRP sheet 17 and the second FRP sheet 18 . Further, the branch pipe portion 16 can be firmly fixed to the rehabilitation main pipe 15 by the first FRP sheet 17 and the second FRP sheet 18, and the rehabilitation main pipe 15 and the branch pipe portion 16 can be integrated. As a result, the strength of the second rehabilitated pipe can be secured more favorably.

Further, according to the method for rehabilitating existing pipes of the first embodiment, as shown in FIGS. It is formed so as not to protrude greatly from the outer peripheral wall of the rehabilitation main pipe 15. Therefore, the amount of protrusion of the branch pipe portion 16 that protrudes from the outer peripheral wall of the rehabilitation main pipe 15 can be minimized.
As a result, when the second rehabilitated pipe 12 is transported inside the existing pipe 1 in the second step, for example, the branch pipe portion 16 does not interfere with the existing pipe 1 even inside the narrow existing pipe 1. 2, the rehabilitation pipe 12 can be transported to the connection position of the existing branch pipe 2.

Further, the second rehabilitation pipe 12 has a branch pipe portion 16 branched from the rehabilitation main pipe 15 . Therefore, in the third step, the connection pipe 5 can be inserted into the branch pipe portion 16 from the inside of the second rehabilitation pipe 12, and the connection pipe 5 can be inserted into the existing branch pipe 2 for connection. By providing the second rehabilitating pipe 12 with the branch pipe portion 16 in this way, the concern about the strength of the second rehabilitating pipe 12 when the attachment hole 26 has a large diameter, which has been a concern in the prior art, is resolved. That is, by providing the branch pipe portion 16 in the main rehabilitation pipe 15, the main rehabilitation pipe 15 can be reinforced by the branch pipe portion 16, and the strength of the second rehabilitation pipe 12 can be ensured even when the mounting hole 26 has a large diameter.

In addition, in the rotating step in the middle of the second step, the branch pipe portion 16 is moved upward by rotating the second rehabilitating pipe 12 around the pipe axis. Therefore, the branch pipe portion 16 can be separated from the pipe bottom portion 1a of the existing pipe 1 and opposed to the pipe side wall 1b of the existing pipe 1 . This can prevent the branch pipe portion 16 from interfering with the pipe bottom portion 1a of the existing pipe 1, for example, when the first rehabilitation pipe 11 is transported to the connecting position of the existing branch pipe 2 in a narrow existing pipe.

[Second embodiment]
Next, the second rehabilitation pipe 62 and the existing pipe rehabilitation method of the second embodiment will be described with reference to FIGS. 11 to 19 . In the second rehabilitating pipe 62 and the existing pipe rehabilitating method of the second embodiment, the same or similar configurations as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
The existing pipe rehabilitation method of the second embodiment differs from the first embodiment mainly in that the connection pipe 5 is connected to the existing branch pipe 2 using the guide part 50. It is similar to the embodiment.

FIG. 11 is a cross-sectional view showing a state in which a second rehabilitated pipe according to a second embodiment of the present invention is laid inside an existing pipe.
As shown in FIG. 11, in the existing pipe rehabilitation method of the second embodiment, a guide portion (guide plate) 50 is fixed to the connection port 2a of the existing branch pipe 2 on the pipe side wall 1b of the existing pipe 1 with an anchor bolt 51. (install). That is, the existing pipe rehabilitation method includes a guide portion attaching step of attaching the guide portion 50 to the connection port 2 a of the existing branch pipe 2 . The guide portion 50 is attached to the connection port 2 a of the existing branch pipe 2 . The guide portion attaching step is performed before the third step.
The guide portion (guide plate) 50 has an opening 57 positioned coaxially with the connection port 2a.

Here, the guide portion 50 will be described in detail.
As shown in FIG. 12, the guide portion 50 is a plate-like member having a thickness of 10 mm or more and 50 mm or less. 12 shows the plate member 50A before being processed into the guide portion 50. As shown in FIG.
For example, the guide portion 50 has a rectangular shape when viewed in the thickness direction of the guide portion 50 . The guide portion 50 is formed with an opening 57 having a circular shape when viewed in the thickness direction. The opening 57 penetrates the guide portion 50 in the thickness direction.
The width and length of the plate member 50A are not particularly limited as long as they are large enough to carry the plate member 50A to the construction site. This is because the guide portion 50 can be processed by cutting out the plate member 50A as appropriate. For example, the plate member 50A has a width of 600 mm and a length of 1200 mm.

The material of the guide portion 50 (the plate member 50A) may be wood, concrete, thermoplastic resin, thermosetting resin, or the like, and is not particularly limited. From the viewpoint of workability and workability at the construction site, the material of the guide part 50 is more preferably a fiber-reinforced composite material. A fiber-reinforced composite material is, for example, a cured product of long glass fibers and a rigid urethane resin composition. This cured product may contain foaming agents, additives and the like.

In order to attach the guide portion 50 to the connection port 2 a of the existing branch pipe 2 , the following processing is performed according to the diameter (nominal diameter) of the connection port 2 a of the existing branch pipe 2 .

For example, when the diameter of the connection port 2a of the existing branch pipe 2 is 75A, the outer diameter a (mm) of the connection pipe 5 is 89 mm. At this time, the diameter b (mm) of the opening (drilled hole) 57 formed in the plate member 50A can be expressed by the formula "a+(30 to 50)". Specifically, the diameter b is 119 mm to 139 mm. The width c (mm) of the guide portion 50 can be expressed by the formula “b+(100 to 150)”.

The processing of the plate member 50A is performed before the rehabilitating pipe 10 is carried into the shaft M. As shown in FIG. As shown in FIG. 12, before processing the plate-like member 50A, a scribe line 51A may be drawn on the plate-like member 50A according to the processing dimensions.
For example, a nail 150 is inserted into the central portion of the plate member 50A. A first end of a string 151 is connected to the nail 150 , and a second end of the string 151 opposite to the first end is connected to a writing instrument 152 . A circular scribe line 51A is drawn on the plate member 50A with a writing tool 152 while the string 151 is stretched.

A tool for processing the plate member 50A into the guide portion 50 is not limited.
For example, a case where the plate member 50A is made of a fiber-reinforced composite material will be described.
For ease of processing at the construction site, it is desirable to use a processing tool such as an electric power tool such as a jigsaw 155 shown in FIG. 13 or a manual tool such as a saw. A processing tool is used to cut the plate-like member 50A along the scribed lines 51A to form openings 57 in the plate-like member 50A.
The guide portion 50 is fixed to the existing branch pipe 2 with anchor bolts 51 . Therefore, as shown in FIG. 14, a bolt hole 52A is made by an electric drill 160 or the like at a position where the anchor bolt 51 is passed through in the plate member 50A (guide portion 50).
By performing the above steps, the guide portion 50 is manufactured from the plate member 50A.

As shown in FIG. 11, the opening 57 of the guide plate 50 and the connection port 2a of the existing branch pipe 2 are arranged substantially coaxially with each other, and the opening 57 of the guide plate 50 communicates with the connection port 2a of the existing branch pipe 2. ing.
One end 5 a of the connection pipe 5 is arranged in the opening 57 of the guide portion 50 , and the connection pipe 5 communicates with the existing branch pipe 2 .

In the second embodiment, an example in which the opening 57 is formed in the flat plate-like guide portion 50 will be described.

With the guide portion 50 fixed to the connection port 2 a of the existing branch pipe 2 , the branch pipe portion 66 of the second rehabilitation pipe (rehabilitation pipe) 62 is moved with respect to the opening 57 of the guide portion 50 in the axial direction and the vertical direction ( height direction). The aligned second rehabilitation pipe 62 is fixed in a state in which it is prevented from floating. Note that the second rehabilitation pipe 62 will be described later in detail.

With the branch pipe portion 66 aligned with the guide portion 50 , the connection pipe 5 is inserted into the branch pipe portion 66 from the inside of the second rehabilitation pipe 62 . The inserted connecting pipe 5 is caused to protrude from the branch pipe portion 66, and one end 5a of the connecting pipe 5 is inserted into the opening portion 57 of the guide portion 50, and the connecting pipe 5 and the existing branch pipe 2 are aligned. In this state, a block or the like is driven into the gap between the connecting pipe 5 and the branch pipe portion 66 to temporarily fix the connecting pipe 5 coaxially with the existing branch pipe 2 .

In a state in which the connecting pipe 5 is temporarily fixed coaxially with the existing branch pipe 2, resin mortar (epoxy resin-based two-component bonding agent) (not shown) is applied to the gap between the one end 5a of the connecting pipe 5 and the opening 57. to fill. Therefore, the joint between the one end 5a of the connection pipe 5 and the opening 57 is closed, and the connection pipe 5 is integrated with the guide portion 50 and the existing pipe 1 in a connected state. As a result, the connection pipe 5 is fixed to the existing branch pipe 2 so as to be communicated substantially coaxially.

Next, the second rehabilitation pipe 62 of the second embodiment will be described with reference to FIGS. 15 and 16. FIG.
The second rehabilitating pipe 62 of the second embodiment differs from the first embodiment only in that the branch pipe portion 66 is eccentric upward with respect to the pipe axis 28, and the rest of the configuration is the same as that of the first embodiment. be.

FIG. 15 is a side view showing the second rehabilitating pipe of the second embodiment. 16 is a cross-sectional view taken along line XV-XV of FIG. 15. FIG.
As shown in FIGS. 15 and 16 , the second rehabilitation pipe 62 is provided with mounting holes 76 in the outer peripheral wall of the rehabilitation main pipe 65 . For example, the mounting hole 76 has a circular shape centered on a position that is eccentric to the upper side of the pipe axis 28 by a distance H2 at the center in the pipe axis direction when viewed from the side of the rehabilitation main pipe 65. is open. A branch pipe portion 66 is connected to the periphery of the mounting hole 76 (that is, the outer wall of the rehabilitation main pipe 65).

The branch pipe portion 66 is located, for example, at the center in the pipe axial direction and above the pipe axis 28 by a distance H2 in a side view of the rehabilitation main pipe 65 (side view shown in FIG. 15). It is formed in a cylindrical shape coaxially with the mounting hole 76 with the eccentric position as the center. The branch pipe portion 66 has an opening end 66c formed in an arc shape centering on the pipe axis 28 in a side view (side view shown in FIG. 16) seen from the pipe axis direction of the rehabilitating main pipe 65 . Therefore, the opening end 66 c of the branch pipe portion 66 can be formed along the outer peripheral wall of the rehabilitation main pipe 65 . This prevents the opening end 66 c of the branch pipe portion 66 from protruding significantly from the outer peripheral wall of the rehabilitation main pipe 65 . Further, the rehabilitation main pipe 65 and the branch pipe portion 66 are integrally adhered with the first FRP sheet 17 and the second FRP sheet 18 .
In the second embodiment, as an example, the rehabilitation main pipe 65 is formed with a diameter of 1650 mm, and the branch pipe portion 66 is formed with a diameter of 800 mm. The diameter of the rehabilitation main pipe 65 and the diameter of the branch pipe portion 66 can be arbitrarily selected.

As described above, according to the second rehabilitated pipe 62 of the second embodiment, the same effects as those of the second rehabilitated pipe 12 of the first embodiment are achieved.
Further, the guide portion 50 is attached to the connection port 2 a of the existing branch pipe 2 . Therefore, the pipe such as the connecting pipe 5 can be easily connected to the connection port 2 a of the existing branch pipe 2 by the guide portion 50 .
Further, the method for rehabilitating an existing pipe includes a step of attaching a guide portion. Therefore, a pipe such as the connecting pipe 5 can be easily connected to the connection port 2 a of the existing branch pipe 2 by the guide portion 50 .
Note that the method for rehabilitating an existing pipe does not have to include the step of attaching the guide portion.

The configuration of the second rehabilitation pipe 12 of the present embodiment can be variously modified as described below.
A first modification of the second embodiment shown in FIG. 17 includes a guide portion 80 instead of the guide portion 50 of the second embodiment.
The guide portion 80 has a tubular sleeve portion 81 and a flange portion 82 formed on the outer circumference of one end portion of the sleeve portion 81 .
The flange portion 82 is formed in an annular shape. A plurality of bolt holes 82 a are formed in the flange portion 82 .

The mounting operation for mounting the guide portion 80 on the existing pipe 1 is performed as follows. A plurality of anchor bolts 51 are attached in advance to the inner surface of the existing pipe 1 around the opening of the connection port 2 a of the existing branch pipe 2 . At this time, the plurality of anchor bolts 51 are preferably arranged around the connection port 2a of the existing branch pipe 2 at regular intervals.
First, the flange portion 82 of the guide portion 80 is attached to the connection port 2 a of the existing branch pipe 2 , and the flange portion 82 is brought into contact with the inner surface of the existing pipe 1 . At this time, the sleeve portion 81 of the guide portion 80 is arranged so as to protrude toward the inside of the existing pipe 1 . A plurality of bolt holes 82 a of the flange portion 82 are fitted to the plurality of anchor bolts 51 . The shaft portions of the anchor bolts 51 are inserted through the plurality of bolt holes 82 a of the flange portion 82 . The guide portion 80 is fastened to the existing pipe 1 by screwing the nut 83 onto the anchor bolt 51 .

In order to attach the guide part 80 to the existing pipe 1, in addition to fastening with the anchor bolt 51 and the nut 83, an epoxy resin-based two-liquid type bonding agent capable of bonding the concrete and the vinyl chloride resin member is used together. good too.

As in the second modification of the second embodiment shown in FIG. 18 , the guide portion 85 may not have the sleeve portion 81 for each configuration of the guide portion 80 . That is, the guide portion 85 has the flange portion 82 .

As in the third modification of the second embodiment shown in FIG. 19, the existing branch pipe 2 and the connecting pipe 5 may be connected. That is, the connection pipe 5 is temporarily fixed coaxially with the existing branch pipe 2 . In this state, a joint filling process is performed between the connection port 2a of the existing branch pipe 2 and the one end 5a of the connection pipe 5, for example.
The joint filling process is performed by filling resin mortar (not shown), which is, for example, an epoxy resin-based two-liquid type bonding agent, while removing the square timber.
As a result, the joint between the one end 5a of the connection pipe 5 and the connection port 2a of the existing branch pipe 2 is sealed, and the connection pipe 5 is integrated with the guide portion 80 and the existing pipe 1 in a connected state. Further, the connection pipe 5 is fixed to the existing branch pipe 2 so as to be communicated substantially coaxially therewith.

A sealing process is performed by applying or filling a caulking material (sealing material) 90 to the connecting portion between the existing branch pipe 2 and the connecting pipe 5 and the connecting portion between the guide portion 80 and the connecting pipe 5 .
It is preferable that the caulking material 90 is mainly composed of a synthetic resin material such as a silicone resin, an acrylic resin, or a urethane resin. A caulking material 90 is applied or filled to these parts using an extruder 92 such as a caulking gun.
As a result, the junction between the existing branch pipe 2 and the connecting pipe 5 can be watertight. In addition, since the existing branch pipe 2 and the connecting pipe 5 can be closely joined so that the inner peripheral surface is substantially continuous, the water stopping effect is greatly enhanced, and all the running water from the existing branch pipe 2 is rehabilitated. It can lead to tube 10 .

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, in the first embodiment, the rotation step is performed in the middle of the second step to rotate the second rehabilitated pipe 12 around the pipe axis and move the branch pipe portion 16 vertically (highly) with respect to the connection position. Although an example in which alignment is performed in the vertical direction has been described, the present invention is not limited to this. As another example, a rotation process may be performed between the second process and the third process. That is, by performing the rotation step between the second step and the third step, the second rehabilitated pipe 12 is rotated around the pipe axis, and the branch pipe portion 16 is moved vertically (in the height direction) with respect to the connection position. ) may be aligned.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1... Existing pipe 2... Existing branch pipe 12, 62... Second rehabilitation pipe (rehabilitation pipe) 15, 65... Rehabilitation main pipe 16, 66... Branch pipe portion 28... Pipe axis 16c, 66c... Opening End 17... First FRP sheet (FRP sheet) 18... Second FRP sheet (FRP sheet) 50, 80, 85... Guide part M... Vertical shaft (vertical hole).

Claims (8)

A rehabilitation pipe for rehabilitating an existing pipe to which an existing branch pipe is connected,
Rehabilitation main,
a branch pipe portion branched from the rehabilitation main pipe and having a smaller diameter than the rehabilitation main pipe;
A rehabilitating pipe characterized in that, in a side view of the branch pipe portion viewed from the direction of the pipe axis of the main rehabilitating pipe, an opening end of the branch pipe portion has an arc shape centered on the pipe axis. 2. The rehabilitating pipe according to claim 1, wherein the branch pipe portion has a diameter of 500 mm or more. 3. The rehabilitating pipe according to claim 1, wherein the main rehabilitating pipe and the branch pipe are made of fiber-reinforced plastic. 3. The rehabilitating pipe according to claim 1 or 2, wherein the rehabilitating main pipe and the branch pipe are separate members and are adhered with a sheet material. 2. The rehabilitating pipe according to claim 1, wherein a guide portion is attached to the connection port of the existing branch pipe. A method for rehabilitating an existing pipe to which an existing branch pipe is connected using the rehabilitating pipe according to claim 1 or 2,
a conveying step of conveying the rehabilitated pipe within the existing pipe;
a connecting step of inserting a connecting pipe from inside the rehabilitating pipe into the branch pipe portion to connect the connecting pipe to the existing branch pipe. 7. The method for rehabilitating an existing pipe according to claim 6, wherein the rehabilitating pipe is rotated around a pipe axis during the transporting step or between the transporting step and the connecting step. 7. The method for rehabilitating an existing pipe according to claim 6, further comprising, before the connecting step, a step of attaching a guide portion to the connection port of the existing branch pipe.

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