Water-stopping method and structure for the outer periphery of the pipe end

Abstract

To surely cut off water between an outer periphery of a pipe end part of a rehabilitation pipe stuck to an existing pipe and the inner periphery of the existing pipe with good workability.SOLUTION: A belt-like member 9 having a projection 15 projected to an outer peripheral side is spirally wound to form a spiral tubular rehabilitation pipe 9, and the rehabilitation pipe 9 is stuck to the inner periphery of an existing pipe 1. A through-hole 21 penetrating in the pipe thickness direction of a pipe end part 90 of the rehabilitation pipe 9 is formed to communicate with a spiral slit 9d defined by the projection 15 on the outer periphery of the rehabilitation pipe 9. A communication part 23 between the through-hole 21 and the spiral slit 9d is blocked by a water stop material 22.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method and structure for sealing water between the outer periphery of the end of a rehabilitated pipe constructed on the inner periphery of an existing pipe such as an aging sewer pipe and the existing pipe, and in particular to a method and structure for sealing water around the outer periphery of the end of a rehabilitated pipe that is made into a spiral pipe from a strip-shaped member having protrusions protruding outward and attached to the inner periphery of the existing pipe. [Background technology]

[0002] A known method for rehabilitating existing pipes such as aging sewer pipes involves spirally winding a strip-shaped member (profile) around the inner periphery of the existing pipe and joining adjacent edges offset by one revolution to form a spiral rehabilitated pipe (see Patent Document 1, etc.). A helical slit is formed in the rehabilitated pipe at the joint between the adjacent edges. A plurality of ribs (convex strips) extending in the strip length direction are formed on the outer peripheral side surface of the strip-shaped member (the surface that constitutes the outer peripheral surface of the rehabilitated pipe). The ribs become spirally shaped during pipe manufacturing. A groove-like helical slit is formed between adjacent ribs on the outer periphery of the rehabilitated pipe after pipe manufacturing.

[0003] In Patent Document 1, a head-pushing pipe making machine is used to make a rehabilitating pipe with a smaller diameter than the existing pipe, and then the circumferential length is expanded so that the rehabilitating pipe is attached to the inner circumference of the existing pipe.

[0004] A waterproofing treatment is performed between the outer periphery of the end of the rehabilitating pipe and the inner periphery of the existing pipe. For example, an epoxy adhesive is injected into the pipe opening and applied to the outer periphery of the rehabilitating pipe before expanding. The rehabilitating pipe is then tightly fitted to the inner periphery of the existing pipe by expanding. At the same time, the epoxy adhesive is filled into the spiral slit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-093547 Summary of the Invention [Problem to be solved by the invention]

[0006] In the above-mentioned waterproofing method, the epoxy adhesive must be injected onto the outer periphery of the rehabilitating pipe through the narrow annular gap between the end of the rehabilitating pipe and the existing pipe before expansion, which is inefficient. Furthermore, it is not possible to confirm whether the epoxy adhesive has completely filled the spiral slit after expansion. In view of the above circumstances, the present invention aims to reliably and efficiently stop water between the outer periphery of the end of a rehabilitation pipe attached to an existing pipe and the inner periphery of the existing pipe. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a method for sealing water between the outer periphery of a pipe end and an existing pipe in a spiral rehabilitation pipe formed by helically winding a strip-shaped member having a protrusion protruding outward and attached to the inner periphery of the existing pipe, the method comprising: a hole forming step of forming a through hole penetrating the pipe end in a pipe thickness direction so as to communicate with one or more spiral slits defined by the ridges; a closing step of closing a communication portion between the through hole and the spiral slit with a water-stopping material; The present invention is characterized by the following features. The drilling of the through hole can be performed from the inner periphery of the end of the rehabilitated pipe using a drilling tool. Furthermore, the sealing of the connection with the water-stopping material can be performed from the inner periphery of the end of the rehabilitated pipe. There is no need to inject the water-stopping material directly into the narrow gap between the inner periphery of the existing pipe and the outer periphery of the rehabilitated pipe from the pipe opening end face. Therefore, the water-stopping work on the outer periphery of the pipe end can be performed with good workability. In a rehabilitated existing pipe, even if groundwater passes through the existing pipe and flows into the spiral slit, the communicating portion of the spiral slit at the end of the pipe is blocked by a water-stopping material, preventing water from leaking out from the outer periphery of the end of the pipe.

[0008] It is preferable that the hole forming step includes a step of forming a plurality of through-hole portions, and each of the plurality of spiral slits communicates with at least one of the plurality of through-hole portions. The closing step preferably includes a step of closing the communication portion between each through-hole portion and the spiral slit with the water-stopping material. This allows each of the multiple spiral slits to be closed at the end of the pipe to stop water leakage.

[0009] In the hole forming step, two adjacent through hole portions among the plurality of through hole portions may be formed so as to partially overlap each other, or two adjacent through hole portions among the plurality of through hole portions may be formed so as to be spaced apart from each other. In short, the arrangement of the plurality of through hole portions is determined so that each spiral slit communicates with at least one through hole portion. The through hole portions can be connected or spaced apart depending on the situation.

[0010] The structure of the present invention is a pipe end outer periphery watertight structure that is formed by spirally winding a belt-shaped member having a protrusion protruding outward from the outer periphery, and is provided at the pipe end of a spiral tubular rehabilitation pipe attached to the inner periphery of an existing pipe, and that seals off water between the outer periphery of the pipe end and the existing pipe, The rehabilitation pipe has one or more spiral slits defined by the ridges, a through hole penetrating the pipe end in a pipe thickness direction is formed so as to communicate with the spiral slit; The communicating portion between the through hole and the spiral slit is closed with a water-stopping material. As a result, even if water such as groundwater flows into the spiral slit and flows toward the pipe end, the water-stop material in the communication section can prevent the water from leaking out from the outer periphery of the pipe end.

[0011] It is preferable that the through hole includes a plurality of through hole portions, each of the plurality of spiral slits communicates with at least one of the plurality of through hole portions, and the communicating portion between each of the through hole portions and the spiral slit is blocked by the water-stopping material, thereby blocking each of the plurality of spiral slits at the pipe end to stop water.

[0012] Any two adjacent through hole portions among the plurality of through hole portions may be connected to each other, or any two adjacent through hole portions among the plurality of through hole portions may be separated from each other. Of three or more through hole portions, some adjacent through hole portions may be connected to each other, and other adjacent through hole portions may be separated from each other. [Effects of the Invention]

[0013] According to the present invention, it is possible to reliably seal the gap between the outer periphery of the pipe end of a rehabilitation pipe attached to an existing pipe and the inner periphery of the existing pipe with good workability. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional side view of an existing rehabilitated pipe to which a pipe end outer periphery water stop structure according to one embodiment of the present invention has been installed. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. 5(a), showing an example of the cross-sectional shape of the strip-shaped member before it is manufactured into a rehabilitating pipe for the rehabilitated existing pipe. [Figure 3] FIG. 3 is an enlarged cross-sectional view of the pipe end outer periphery water-stop structure, showing the circular portion III in FIG. [Figure 4] Fig. 4(a) is an arrow view of the pipe end outer peripheral watertight structure as seen from the inner periphery of the pipe end of the rehabilitation pipe along line IV-IV in Fig. 3. Fig. 4(b) is an arrow view showing a modified example of the pipe end outer peripheral watertight structure. [Figure 5] Figure 5 shows the steps of the rehabilitation process for the existing pipe in sequence, with Figure 5(a) being a side cross-sectional view of the original extrusion pipe manufacturing process for the rehabilitation pipe, Figure 5(b) being a side cross-sectional view of the expanding process, and Figure 5(c) being a side cross-sectional view of the hole forming process for waterproofing the outer periphery of the pipe end. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, an aged existing pipe 1 is rehabilitated by a rehabilitation pipe 9. The existing pipe 1 to be rehabilitated in this embodiment is an aged sewer pipe, but is not limited to this and may also be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, a tunnel, etc.

[0016] A rehabilitation pipe 9 is constructed along the inner periphery of the existing pipe 1. The rehabilitation pipe 9 is a spiral pipe made of a strip-shaped member 10 (profile). The main material of the strip-shaped member 10 is a synthetic resin such as polyvinyl chloride. As shown in Figure 2, the strip-shaped member 10 has multiple ribs 15 formed thereon. The cross section of the ribs 15 is, for example, a rectangle with an internal space 15c. Each rib 15 protrudes toward the outer periphery (the side facing the outer periphery of the rehabilitation pipe 9) and extends in the strip length direction of the strip-shaped member 10. The multiple ribs 15 are lined up in the strip width direction. The cross-sectional shape of the belt-shaped member 10 is not limited to the one exemplified in FIG.

[0017] 1 and 3, a strip-shaped member 10 is wound spirally around the inner periphery of an existing pipe 1, and adjacent edges 13, 14 that are offset from each other by one revolution are joined together by a concave-convex fit, thereby producing a spiral rehabilitating pipe 9. A joint-like spiral slit 9b is formed in the rehabilitating pipe 9 by the adjacent edges 13, 14. The joint-like spiral slit 9b appears on the smooth inner periphery of the rehabilitating pipe 9.

[0018] Each ridge 15 in the rehabilitating pipe 9 extends spirally. A groove-shaped spiral slit 9d is formed between adjacent ridges 15. The groove-shaped spiral slit 9d opens on the outer periphery of the rehabilitating pipe 9. Therefore, the rehabilitation pipe 9 is provided with a plurality of spiral slits 9b and 9d.

[0019] The groove-like spiral slit 9d' formed on the outer periphery of the edge portion 13 overlaps with the joint-like spiral slit 9b when viewed in a projected view in the pipe thickness direction. The groove-like spiral slit 9d″ formed between the protrusions 15 of both edges 13, 14 and the joint-like spiral slit 9b are separated by an adhesive / sealant 16 or a sealing material (not shown) provided between the edges 13, 14.

[0020] The entire rehabilitating pipe 9 is attached to the entire inner periphery of the existing pipe 1. The outer peripheral opening of the spiral slit 9d is closed by the inner peripheral surface of the existing pipe 1.

[0021] As shown in Figure 3, a pipe end 90 of the rehabilitation pipe 9 is provided with a pipe end outer periphery watertight structure 20 that seals off water between the outer periphery of the pipe end 90 and the existing pipe 1. The pipe end 90 includes an existing pipe inner portion 91 disposed inside the existing pipe 1 and a protruding portion 92 protruding from the existing pipe 1 into the manhole 4.

[0022] 3, the pipe end outer periphery waterproof structure 20 includes a through hole 21 and a waterproof material (sealing material) 22. The through hole 21 penetrates the existing pipe interior portion 91 of the pipe end 90 in the pipe thickness direction. The through hole 21 communicates with the spiral slits 9b and 9d.

[0023] 4, the through hole 21 includes a plurality of (three in the figure) through hole portions 21a. Each of the plurality of spiral slits 9b, 9d communicates with at least one of the through hole portions 21a. The hole diameter φ of the through hole portions 21a is 21a is preferably greater than the width w9 of the communicating spiral slits 9b and 9d (φ 21a >w9), and more preferably, it is larger than the distance D9 between the communicating spiral slits 9b, 9d and the adjacent spiral slit 9d (φ 21a >D9) and smaller than the pitch P9 of each spiral slit 9b, 9d (φ 21a <P9)。

[0024] As shown in FIG. 4(a), these through hole portions 21a may be aligned in the band width direction of the band-shaped member 10 constituting the rehabilitating pipe 9 or in the pipe axis direction of the rehabilitating pipe 9, or two adjacent through hole portions 21a may partially overlap and communicate with each other. As shown in FIG. 4(b), multiple through hole portions 21a may be arranged not only offset in the band width direction but also offset in the band length direction, i.e., the circumferential direction of the rehabilitating pipe 9. Two adjacent through hole portions 21a may be spaced apart. What is important is that each spiral slit 9b, 9d communicates with at least one through hole portion 21a.

[0025] Communication portions 23 between through holes 21 and spiral slits 9b, 9d are blocked by water-stopping material 22. More specifically, communication portions 23a between each through hole portion 21a and spiral slits 9b, 9d are blocked by water-stopping material 22. As the water-stopping material 22, for example, an epoxy adhesive or the like is used.

[0026] 3, mortar 30 is provided on the outer peripheral surface of the protruding portion 92 so as to fill each spiral slit. The mortar 30 is formed in a tapered shape that narrows in diameter from the pipe opening end face 1e of the existing pipe 1 to the tip of the protruding portion 92 and ultimately to the tip of the rehabilitating pipe 9.

[0027] The existing pipe 1 is rehabilitated as follows, and the outer periphery of the pipe end 90 is waterproofed. As shown in Figure 5(a), a push-type pipe making machine 3 installed in the starting manhole 4 is used to make a rehabilitated pipe 9 from a strip-shaped member 10 and push the rehabilitated pipe 9 into the existing pipe 1. At this stage, the rehabilitated pipe 9 is made to have a smaller diameter than the existing pipe 1.

[0028] As shown in Figure 5(b), when the rehabilitation pipe 9 reaches the reach manhole 4B, the circumference of the rehabilitation pipe 9 is expanded using a pipe making machine 3 (see Patent Document 1, etc.), and the rehabilitation pipe 9 is attached to the inner circumference of the existing pipe 1. Then, as shown by the dashed-dotted line CL in Figure 5(b), both ends of the rehabilitating pipe 9 are cut at a position a short distance into the manholes 4, 4B from the pipe opening end face 1e of the existing pipe 1. In the starting manhole 4, the rehabilitating pipe 9 is cut between the pipe opening end face 1e on the starting side (left side in the figure) and the pipe making machine 3. This separates the pipe making machine 3 from the rehabilitating pipe 9.

[0029] The detached pipe making machine 3 is removed. Next, the outer periphery of the pipe end 90 on both sides of the rehabilitating pipe 9 is waterproofed. <Hole forming process> More specifically, as shown in FIG. 5(c), a through hole 21 is formed in the existing pipe interior portion 91 of the pipe end portion 90, penetrating in the pipe radial direction. The through hole 21 is composed of one or more through hole portions 21a. The hole can be drilled from the inner peripheral side of the pipe end portion 90 using a drilling tool 5. This makes it easy to perform the drilling work. The position of the through hole 21 is preferably within 1 m from the pipe opening end face 1e. By performing drilling after removing the pipe making machine 3, sufficient drilling work space can be secured even at the starting pipe end 90.

[0030] 4 and 6, through holes 21 are formed at positions that communicate with spiral slits 9b, 9d. The number and arrangement of through hole portions 21a of through holes 21 are determined so that each of the multiple spiral slits 9b, 9d communicates with through holes 21. Because joint-like spiral slits 9b appear on the inner peripheral surface of the rehabilitation pipe 9, the positions of groove-like spiral slits 9d can be easily estimated using these as a guide, and the positions where holes should be drilled can be easily determined. As shown in FIG. 4(a), adjacent through-hole portions 21a may be connected by partially overlapping each other, or as shown in FIG. 4(b), adjacent through-hole portions may be spaced apart from each other. This allows each of the spiral slits 9b and 9d to communicate with at least one through-hole portion 21a. Each of the spiral slits 9b and 9d has a communicating portion 23 with the through hole 21 formed therein.

[0031] <Closure process> Next, as shown in FIGS. 6 and 7, the communicating portion 23 is filled with the water-stopping material 22. For example, the water-stopping material 22 is applied to the inner surface of the communicating portion 23 with a finger or packed into the communicating portion 23. In this way, the communicating portion 23 is sealed with the water-stopping material 22. Preferably, the water-stopping material 22 is applied to the entire inner circumferential surface 21c (drilled surface) of the through hole 21. The water-stopping material 22 is also filled in the opening 15d of the internal space 15c of the ridge 15 to the through hole 21. More preferably, as shown in FIG. 7, the water-stopping material 22 is also applied to the inner circumferential surface of the existing pipe 1 exposed by the through hole 21. The entire through hole 21 may be filled with the water-stopping material 22.

[0032] The process of closing the communication section 23 by filling with water-stopping material can be carried out from the inner periphery side of the pipe end 90. This simplifies the work of the closing process, as there is no need to inject the water-stopping material directly from the pipe opening end face 1e into the narrow inter-pipe gap between the inner periphery of the existing pipe 1 and the outer periphery of the rehabilitated pipe 9. Even at the starting-side pipe end 90, the pipe making machine 3 has been removed, so sufficient work space for the closing process can be secured.

[0033] <Finishing process> Thereafter, as a finishing touch, mortar 30 is applied to the entire outer periphery of the protruding portion 92 of the pipe end 90. Preferably, the mortar 30 is applied in a tapered shape that narrows in diameter from the pipe opening end face 1e of the existing pipe 1 toward the tip of the rehabilitating pipe 9.

[0034] In this way, the existing pipe 1 is rehabilitated, and the pipe end 90 of the rehabilitated pipe 9 is subjected to outer periphery waterproofing work at the pipe end. In a rehabilitated existing pipe 1, even if groundwater passes through the existing pipe 1 and enters one or more spiral slits 9d, each spiral slit 9d at the pipe end 90 is blocked by a water-stopping material 22, thereby preventing water from leaking out from the pipe opening end face 1e.

[0035] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the cross section of the ridge of the belt-shaped member 10 may be T-shaped, L-shaped, I-shaped, etc. If the ridge has a shape that does not have an internal space 15c, opening 15d is not formed by drilling through hole 21, and therefore processing to close opening 15d is not necessary. If the joint-like spiral slit 9b is sealed by a sealing material sandwiched between the edges 13 and 14 and there is no groove-like spiral slit 9d' (FIG. 2) on the outer periphery of the edge 13, there is no need to perform waterproofing treatment on the joint-like spiral slit 9b. Therefore, it is not necessarily necessary to form a through hole 21 so as to communicate with the joint-like spiral slit 9b and to seal the communicating portion with the waterproof material 22. The belt-shaped members may be structured so as to be connected to each other via belt-shaped connecting members. [Industrial Applicability]

[0036] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0037] 1 Existing pipes 1e Tube end face 3. Main push type pipe making machine 4,4B human hole 5 Drilling tool 9 Rehabilitation pipe 9b Jointed spiral slit 9d Grooved spiral slit (spiral slit) 90 Tube end 91 Pipe end inside existing pipe 92 Protruding part of pipe end 10 Strip-shaped member (profile) 13,14 En 15 Ribs 16 Adhesive sealant 20 Pipe end outer periphery watertight structure 21 through hole 21a Through hole part 22 Water-stopping material 23 Communication section 23a Communication part 30 Mortar

Claims

1. A pipe end outer periphery watertight method for a spiral-shaped rehabilitation pipe, which is formed by helically winding a strip-shaped member having a plurality of protruding ridges on the outer periphery and attached to the inner periphery of an existing pipe, for sealing off water between the outer periphery of the pipe end and the existing pipe, a hole forming step of forming through holes penetrating the pipe end in a pipe thickness direction so as to communicate with all of the spiral slits within one pitch of the spiral at the pipe end, among the plurality of spiral slits defined by the plurality of ridges; a closing step of closing the communication portions between the through holes and all of the spiral slits with a water-stopping material; and wherein no water-stopping material is provided within the spiral slit closer to the center of the rehabilitated pipe in the axial direction than the communicating portion.

2. the hole forming step includes a step of forming a plurality of through-hole portions, each of the plurality of spiral slits communicating with at least one of the plurality of through-hole portions; 2. The method for waterproofing a pipe end periphery according to claim 1, wherein the closing step includes a step of closing a communication portion between each through-hole portion and the spiral slit with the waterproof material.

3. 3. The method for waterproofing a pipe end periphery according to claim 2, wherein in the hole forming step, two adjacent through-hole portions among the plurality of through-hole portions are formed so as to partially overlap each other.

4. 3. The method for waterproofing a pipe end periphery according to claim 2, wherein in the hole forming step, two adjacent through-hole portions among the plurality of through-hole portions are formed so as to be spaced apart from each other.

5. A pipe end outer periphery watertight structure is provided at the pipe end of a spiral tubular rehabilitation pipe attached to the inner periphery of an existing pipe, in which a belt-shaped member having a plurality of protruding stripes protruding outward is wound in a spiral shape and which seals off water between the outer periphery of the pipe end and the existing pipe, The rehabilitation pipe has a plurality of spiral slits defined by the plurality of convex strips, a through-hole penetrating through the pipe end in a pipe thickness direction is formed so as to communicate with all of the spiral slits present within one pitch of the spiral at the pipe end, A pipe end outer periphery water-stopping structure characterized in that the communication parts between the through hole and all of the spiral slits are blocked with water-stopping material, and no water-stopping material is provided within the spiral slits closer to the center of the pipe axis direction of the rehabilitated pipe than the communication parts.

6. A pipe end outer periphery water-stopping structure as described in claim 5, characterized in that the through hole includes a plurality of through hole portions, each of the plurality of spiral slits is connected to at least one of the plurality of through hole portions, and the connecting portions between each through hole portion and the spiral slit are blocked by the water-stopping material.

7. 7. The pipe end outer periphery watertight structure according to claim 6, wherein two adjacent through-hole portions among the plurality of through-hole portions are connected to each other.

8. 7. The pipe end outer periphery watertight structure according to claim 6, wherein two adjacent through-hole portions among the plurality of through-hole portions are spaced apart from each other.

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