Pipe rehabilitation method and pipe for pipe rehabilitation method

Abstract

To provide a pipe rehabilitation method and a pipe for the pipe rehabilitation method capable of smoothly performing the rehabilitation work of a pipe using a resin pipe as a new pipe.SOLUTION: In a pipe rehabilitation method in which an insertion port of a resin-made new pipe 1 with a ring-shaped socket 3 fitted into the outer periphery of one end of a straight pipe 2 is connected to the socket of another new pipe 1 in sequence and advanced into an existing pipe P to rehabilitate the pipe, a fabric-like body 5 is bonded with an adhesive 6 to the outer periphery of the large-diameter socket 3 of the straight pipe 2. In the pipe 1 for a pipe rehabilitation method used when rehabilitating a pipe by sequentially connecting the insertion port of the resin-made new pipe 1, which has the ring-shaped socket 3 fitted into the outer periphery of one end of the straight pipe 2, and the receiving port of another new pipe 1, and propelling it into an existing pipe P, the pipe 1 is configured such that the cloth-like body 5 is adhered with the adhesive 6 to the outer periphery of the socket 3, which has a large diameter relative to the straight pipe 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pipeline rehabilitation method and a pipe for use in the pipeline rehabilitation method. [Background technology]

[0002] A commonly used pipeline rehabilitation method involves connecting a new pipe, which has a socket at one end and a spigot at the other end, with the spigot of another new pipe and inserting it into an existing pipe to rehabilitate the pipeline. For example, in Patent Document 1 listed below, a ductile cast iron pipe is used as the new pipe. A seat is provided on the spigot side of the new pipe to reduce frictional resistance when inserting the new pipe into the existing pipe. This seat is provided across the entire pipe, from the spigot, which has a larger diameter than the straight pipe section, to the tapered section, which gradually reduces in diameter toward the straight pipe section.

[0003] By providing this sheet, when the new pipe is being pushed forward, the friction-reducing effect of the sheet allows the socket of the new pipe to smoothly ride up onto the opening of the existing pipe. Materials used for this sheet include high-molecular-weight polyethylene and tetrafluoroethylene, which have sliding properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4601559 Summary of the Invention [Problem to be solved by the invention]

[0005] The ductile cast iron pipe used in Patent Document 1 can have a tapered section formed between the straight pipe section and the receiving port during centrifugal casting, and by attaching a sheet along this tapered section, it is possible to prevent the sheet from peeling off when the new pipe is advanced.

[0006] On the other hand, when a plastic pipe is used for new construction, the plastic pipe is formed by fitting a ring-shaped receiving portion onto the outer periphery of one end of a straight pipe, resulting in a step between the straight pipe and the receiving portion. If a sheet is installed to span this step, a gap will form between the new pipe and the sheet at the step, and the sheet may peel off from the gap when the new pipe is advanced. Furthermore, the high-molecular-weight polyethylene and tetrafluoroethylene used as the sheet materials in Patent Document 1 have poor adhesive properties and are weak against twisting, which may make sheet peeling more pronounced. Furthermore, when a new plastic pipe is advanced in an environment where foreign objects or accumulated water are present in existing pipes, such as sewer pipes, sheet peeling may become even more pronounced, potentially hindering the pipeline rehabilitation work.

[0007] Therefore, an object of the present invention is to smoothly carry out the rehabilitation work of a pipeline using a resin pipe as a new pipe. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides: In this pipe rehabilitation method, a new resin pipe insertion port, which has a ring-shaped socket fitted around the outer periphery of one end of a straight pipe, is connected to the sockets of other new pipes in sequence and advanced into the existing pipe to rehabilitate the pipe. A pipeline rehabilitation method (first configuration) is configured, characterized in that a cloth-like body is adhered with an adhesive to the outer peripheral surface of the receiving portion, which has a larger diameter than the straight pipe portion.

[0009] In this way, the anchoring effect of the adhesive soaked into the cloth-like material allows the cloth-like material to be firmly adhered to the outer surface of the receiving portion, ensuring protection of the receiving portion, and allowing smooth rehabilitation work of the pipeline using a plastic pipe as a new pipe.

[0010] In the first configuration, a configuration (second configuration) can be adopted in which the coefficient of friction of the surface of the fabric-like material provided on the outer peripheral surface of the receiving portion with respect to the inner surface of the existing pipe is smaller than the coefficient of friction of the outer peripheral surface of the receiving portion with respect to the inner surface of the existing pipe. In this way, in addition to the reinforcing effect of the receiving portion provided by the fabric-like material, the receiving portion can be made to have slidability, making the pipeline rehabilitation work even smoother.

[0011] In the first or second configuration, the fabric body can be configured (third configuration) by weaving threads into at least one surface of a sheet-like nonwoven fabric, and the weaved surface is bonded to the receiving portion. In this way, the weaving of threads reinforces the surface of the fabric body (nonwoven fabric) facing the receiving portion, preventing damage such as tearing of the fabric body when the new pipe is inserted, and increasing the adhesive strength between the fabric body and the receiving portion.

[0012] In order to solve the above problems, the present invention provides: A pipe for pipeline rehabilitation is used when a resin insertion port of a new pipe, which has a ring-shaped receiving port fitted on the outer periphery of one end of a straight pipe, is connected to the receiving port of another new pipe and advanced into the existing pipe to rehabilitate the pipeline. A pipe for use in a pipeline rehabilitation method is configured (fourth configuration), characterized in that a cloth-like body is adhered with an adhesive to the outer peripheral surface of the receiving portion, which has a larger diameter than the straight pipe portion.

[0013] In this way, as with the first configuration, the anchoring effect of the adhesive soaked into the cloth-like material allows the cloth-like material to be firmly adhered to the outer surface of the receiving portion, reliably protecting the receiving portion, and pipeline rehabilitation work using a plastic pipe as a new pipe can be carried out smoothly.

[0014] The fourth configuration can be configured (fifth configuration) such that the coefficient of friction of the surface of the fabric-like material provided on the outer peripheral surface of the receiving portion with respect to the inner surface of the existing pipe is smaller than the coefficient of friction of the outer peripheral surface of the receiving portion with respect to the inner surface of the existing pipe. In this way, in addition to the reinforcing effect of the fabric-like material on the receiving portion, as in the second configuration, the receiving portion can be made to have slidability, making the pipeline rehabilitation work even smoother.

[0015] In the fourth or fifth configuration, the fabric body can be constructed by weaving threads into at least one surface of a sheet-like nonwoven fabric, and the weaved thread surface can be bonded to the receiving portion (sixth configuration). In this way, as in the third configuration, the weaving threads reinforces the surface of the fabric body (nonwoven fabric) facing the receiving portion, preventing damage such as tearing of the fabric body when the new pipe is advanced, and increasing the adhesive strength between the fabric body and the receiving portion. [Effects of the Invention]

[0016] In this invention, the pipeline rehabilitation method and the pipe for use in the pipeline rehabilitation method employ a new resin pipe with a ring-shaped socket fitted around the outer periphery of one end of a straight pipe section, and a fabric body is fixed with adhesive to the outer periphery of the socket, which has a larger diameter than the straight pipe section. In this way, the anchor effect of the adhesive soaked into the fabric body firmly bonds the fabric body to the outer periphery of the socket, reliably protecting the socket and allowing for smooth pipeline rehabilitation work using a resin pipe as the new pipe. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view showing one embodiment of a pipe for use in a pipeline rehabilitation method according to the present invention; [Figure 2] Cross-sectional view of the main part of the pipe used in the pipeline rehabilitation method shown in Figure 1 [Figure 3] 2 is a front view showing a fabric (nonwoven fabric) used in the pipe for the pipeline rehabilitation method shown in FIG. 1, where (a) is the surface to be bonded to the outer circumferential surface of the receiving portion, and (b) is the surface to be in contact with the inner surface of the existing pipe. [Figure 4] FIG. 1 is a cross-sectional view showing one embodiment of a pipe rehabilitation method according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a pipeline rehabilitation method and a pipe 1 for the pipeline rehabilitation method according to the present invention will be described with reference to the drawings. This pipeline rehabilitation method is performed using a pipe 1 for the pipeline rehabilitation method (hereinafter referred to as a new pipe and designated by the same reference numeral as the pipe for the pipeline rehabilitation method 1) shown in Figures 1 and 2.

[0019] This new pipe 1 is a resin (fiber-reinforced plastic (FRP)) pipe body with a ring-shaped socket 3, the outer diameter of which is larger than that of the straight pipe 2, fitted around the outer periphery of one end of the straight pipe 2. One end of the straight pipe 2 (the side where the socket 3 is fitted) serves as the socket for the new pipe 1, and the other end of the straight pipe 2 serves as the insertion port for the new pipe 1. Because the new pipe 1 is constructed by fitting the socket 3 into the straight pipe 2, a step corresponding to the wall thickness of the socket 3 is created between the outer periphery of the straight pipe 2 and the outer periphery of the socket 3. A rubber ring 4 is attached to the inner surface of the socket 3 to ensure a watertight seal between the two new pipes 1 when the socket of this new pipe 1 and the insertion port of another new pipe 1 are joined. Note that this rubber ring 4 can also be attached to the outer periphery of the tip of the insertion port of the straight pipe 2.

[0020] A fabric body 5 is adhered to the entire outer periphery of the receiving portion 3 with an adhesive 6. In this embodiment, this fabric body 5 is a polyester sheet-like nonwoven fabric (product name "Fiber-reinforced Nonwoven Cell Sheet" (manufactured by Maeda Kosen Co., Ltd.)) (hereinafter, the same reference numeral as the fabric body 5) shown in FIGS. 3(a) and 3(b). High-strength polyester threads 7 are woven lengthwise and crosswise on one side of this nonwoven fabric 5 (see FIG. 3(a)), and the surface with these threads 7 is adhered to the outer periphery of the receiving portion 3. On the other hand, the threads 7 are not woven on the other side (see FIG. 3(b)), and only the nonwoven fabric 5 is exposed on the surface. This exposed surface of the nonwoven fabric 5 comes into contact with the inner surface of the existing pipe P during the pipeline rehabilitation method.

[0021] In this embodiment, the nonwoven fabric 5 is provided around the entire outer surface of the receiving portion 3, but if it is possible to suppress the rolling phenomenon around the axis of the new pipe 1 when the new pipe 1 is advanced inside the existing pipe P, it may be possible to provide the nonwoven fabric 5 only on a portion of the outer surface of the receiving portion 3.

[0022] The nonwoven fabric 5 provided on the outer peripheral surface of the receiving portion 3 is selected so that the coefficient of friction of the exposed surface of the nonwoven fabric 5 against the inner surface (concrete surface) of the existing pipe P is smaller than the coefficient of friction of the outer peripheral surface (FRP surface) of the receiving portion 3 against the inner surface (concrete surface) of the existing pipe P.

[0023] In this embodiment, a nonwoven fabric 5 is used in which the threads 7 are woven both vertically and horizontally, but the weaving pattern of the threads 7 is not limited to this, and the threads 7 may be woven in only one direction, for example. Also, in this embodiment, a nonwoven fabric 5 in which the threads 7 are woven on only one side is used, but it is also possible to use a nonwoven fabric 5 in which the threads 7 are not woven, or a nonwoven fabric 5 in which the threads 7 are woven on both sides. It is also possible to use a cloth-like body 5 other than the nonwoven fabric 5. Also, in this embodiment, the nonwoven fabric 5 is provided only on the receiving portion 3, but because the nonwoven fabric 5 soaked in the adhesive 6 has high adhesiveness, it is also possible to provide the nonwoven fabric 5 so as to span the step between the straight pipe portion 2 and the receiving portion 3.

[0024] In the pipeline rehabilitation method according to the present invention, as shown in FIG. 4, a vertical shaft H is formed at the opening of the existing pipe P, and a new pipe 1 is delivered through this vertical shaft H. Then, the insertion ports of the new pipes 1 installed in the existing pipe P are sequentially connected to the receiving ports of the other new pipes 1, and the insertion ports of the new pipes 1 are pushed with a jack J to propel the new pipes 1 into the existing pipe P, thereby rehabilitating the pipeline. This process of propelling the new pipes 1 into the existing pipe P is similar to the process used in the general sheath pipe jacking method. Once all the new pipes 1 have been joined, a filler material such as mortar (not shown) is filled and allowed to harden in the gap between the inner surface of the existing pipe P and the outer periphery of the new pipes 1, completing the rehabilitation process. It is also possible to position the receiving ports and insertion ports of the new pipes 1 in the opposite direction to that shown in FIG. 4, and propel the new pipes 1 by pushing the receiving ports with a jack J.

[0025] In the above-mentioned pipeline rehabilitation method and the pipe 1 (newly constructed pipe 1) for the pipeline rehabilitation method, a nonwoven fabric 5 (cloth-like body 5) is bonded to the outer surface of the receiving portion 3 of the newly constructed resin pipe 1 with adhesive 6. Therefore, due to the anchoring effect of the adhesive 6 that has soaked into the nonwoven fabric 5, the nonwoven fabric 5 can be firmly bonded to the outer surface of the receiving portion 3, thereby ensuring protection of the receiving portion 3, compared to, for example, when high molecular weight polyethylene, tetrafluoroethylene, etc. is provided in the receiving portion 3.

[0026] Therefore, even if a new pipe 1 made of a plastic pipe is advanced in an environment where foreign objects or accumulated water are present in an existing pipe P, such as a sewer pipe, there is no risk of the nonwoven fabric 5 peeling off due to foreign objects or the like, causing a problem in which the receiving portion 3 of the new pipe 1 and the inner surface of the existing pipe P come into direct contact during the advancing work of the new pipe 1, and the pipeline rehabilitation work using a plastic pipe as the new pipe 1 can be carried out smoothly.

[0027] Furthermore, the above-mentioned pipeline rehabilitation method and the pipe 1 (newly constructed pipe 1) for the pipeline rehabilitation method are configured so that the coefficient of friction of the surface of the nonwoven fabric 5 provided on the outer peripheral surface of the receiving portion 3 against the inner surface of the existing pipe P is smaller than the coefficient of friction of the outer peripheral surface of the receiving portion 3 against the inner surface of the existing pipe P. Therefore, in addition to the reinforcing effect of the receiving portion 3 provided by the nonwoven fabric 5, the receiving portion 3 can be made to have sliding properties, making it possible to carry out the pipeline rehabilitation work even more smoothly.

[0028] Furthermore, in the above-mentioned pipeline rehabilitation method and the pipe 1 (newly constructed pipe 1) for the pipeline rehabilitation method, the cloth-like body 5 is constructed by weaving thread 7 into at least one surface of the sheet-like nonwoven fabric 5, and the surface with the woven thread 7 is adhered to the receiving portion 3. Therefore, the surface of the nonwoven fabric 5 facing the receiving portion 3 is reinforced by the weaving of thread 7, which prevents damage such as tearing of the nonwoven fabric 5 when the newly constructed pipe 1 is advanced, and also increases the adhesive strength between the nonwoven fabric 5 and the receiving portion 3.

[0029] The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. Therefore, the scope of the present invention is defined by the claims, not by the above description, and is intended to include the meaning equivalent to the claims and all modifications thereof. [Explanation of symbols]

[0030] 1 Pipe for pipeline rehabilitation method (newly installed pipe) 2 Straight pipe section 3 Socket 4 rubber rings 5 Cloth-like material (non-woven fabric) 6. Adhesive 7. Thread P Existing pipe H shaft J jack

Claims

1. In this pipeline rehabilitation method, a resin-made new pipe (1) having a ring-shaped socket (3) fitted around the outer periphery of one end of a straight pipe (2) is inserted into the socket of another new pipe (1) and the new pipe is thrust into the existing pipe (P) while sequentially connecting the two pipes together to rehabilitate the pipeline. A pipe rehabilitation method characterized in that a cloth-like material (5) is adhered with an adhesive (6) to the outer surface of the receiving portion (3), which has a larger diameter than the straight pipe portion (2).

2. A pipeline rehabilitation method as described in claim 1, wherein the coefficient of friction of the surface of the cloth-like material (5) provided on the outer peripheral surface of the receiving portion (3) against the inner surface of the existing pipe (P) is smaller than the coefficient of friction of the outer peripheral surface of the receiving portion (3) against the inner surface of the existing pipe (P).

3. 3. A pipeline rehabilitation method according to claim 1 or 2, wherein the cloth-like body (5) is formed by weaving threads (7) into at least one surface of a sheet-like nonwoven fabric (5), and the surface into which the threads (7) are woven is adhered to the receiving portion (3).

4. A pipe for a pipe rehabilitation method is used when a resin insertion port of a new pipe (1) having a ring-shaped receiving portion (3) fitted on the outer periphery of one end of a straight pipe portion (2) is connected to the receiving portion of another new pipe (1) in sequence and advanced into an existing pipe (P) to rehabilitate the pipe. A pipe for pipeline rehabilitation construction, characterized in that a cloth-like material (5) is adhered with an adhesive (6) to the outer surface of the receiving portion (3), which has a larger diameter than the straight pipe portion (2).

5. A pipe for pipeline rehabilitation construction as described in claim 4, wherein the friction coefficient of the surface of the cloth-like material (5) provided on the outer peripheral surface of the receiving portion (3) against the inner surface of the existing pipe (P) is smaller than the friction coefficient of the outer peripheral surface of the receiving portion (3) against the inner surface of the existing pipe (P).

6. A pipe for pipeline rehabilitation construction as described in claim 4 or 5, wherein the cloth-like body (5) is formed by weaving threads (7) into at least one surface of a sheet-like nonwoven fabric (5), and the surface into which the threads (7) are woven is adhered to the receiving portion (3).

Images