Sealing method and structure for pipe end opening

Abstract

To reliably stop water at a pipe-to-pipe end opening between a rehabilitated pipe adhered to an inner periphery of an existing pipe and the existing pipe.SOLUTION: A band-shaped member 10 is spirally wound so as to be attached to an inner circumference of an existing pipe 1 to produce a helical rehabilitated pipe 9. A front side weir portion 31a and a back side weir portion 31b are formed at positions separated from each other by one pitch or more in a spiral groove 17 defined by a plurality of ribs 15 around a pipe end portion 9e of the rehabilitated pipe 9. A water stopping material 32 is filled in a spiral groove portion 18 between the front side weir portion 31a and the back side weir portion 31b in the spiral groove 17.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a method and structure for sealing a pipe-to-pipe end opening made between an existing pipe such as an aged sewer pipe and the pipe end of a rehabilitation pipe constructed around its inner periphery, and in particular to a method and sealing structure for sealing a pipe-to-pipe end opening made between the pipe end of a spiral tubular rehabilitation pipe manufactured so as to be attached to the inner periphery of the existing pipe and the existing pipe. [Background technology]

[0002] There is a known method for rehabilitating an existing pipe, such as an aged sewer pipe, by spirally winding a strip-shaped member (profile) around the inner circumference of the existing pipe to construct a helical rehabilitation pipe. In general, a plurality of ribs 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 rehabilitation pipe), and grooves are formed between adjacent ribs (see Patent Documents 1 to 4, etc.).

[0003] Patent documents 1 and 2 propose a pipe making machine that can make a rehabilitating pipe with a slightly enlarged diameter and attach it to the inner circumference of an existing pipe. Patent Document 3 proposes a band-shaped member for rehabilitation pipes, the cross-sectional shape of which allows it to be attached to the inner circumference of an existing pipe by expanding its diameter during pipe manufacturing. Patent Document 4 proposes manufacturing a rehabilitating pipe to have a smaller diameter than the existing pipe, and then expanding the periphery of the pipe, thereby attaching the rehabilitating pipe to the inner periphery of the existing pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication WO2016 / 175243A1 [Patent Document 2] International Publication WO2017 / 170866A1 [Patent Document 3] International Publication WO2018 / 159627A1 [Patent Document 4] JP 2020-093547 A Summary of the Invention [Problem to be solved by the invention]

[0005] After the rehabilitated pipe is manufactured, the inter-pipe end opening between the outer periphery of the end of the rehabilitated pipe and the inner periphery of the existing pipe is sealed with a water-stopping material. A normal inter-pipe end opening has enough space for a worker to insert his or her finger, so there is no hindrance to the application of the water-stopping material, but when the rehabilitated pipe is attached to the existing pipe, the inter-pipe end opening is too narrow to insert a finger, making it difficult to apply the water-stopping material to the entire circumference of the inter-pipe end opening and making the water-stopping work difficult. In view of the above circumstances, the present invention has an object to reliably stop water from entering an end of a rehabilitating pipe that is attached to the inner periphery of an existing pipe and is then connected to the existing pipe. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a method for sealing an inter-pipe end opening between an outer periphery of a pipe end of a spiral rehabilitating pipe formed by helically winding a belt-shaped member having a plurality of ribs formed on an outer periphery side thereof extending in a belt length direction around an inner periphery of an existing pipe, the method comprising the steps of: a dam forming step of forming a front dam portion and a rear dam portion at positions spaced apart from each other by one or more pitches in the spiral groove defined by the plurality of ribs on the outer periphery of the pipe end portion; a filling step of filling a water-stopping material into a portion of the spiral groove between the front dam portion and the rear dam portion; The present invention is characterized by comprising:

[0007] The spiral groove portion defined by the front dam portion and the rear dam portion is a closed space having a length of at least one revolution in the winding direction of the spiral tubular rehabilitation pipe. By injecting water-stopping material into one point of the spiral groove portion, the water-stopping material spreads around at least one revolution in the winding direction, using the spiral groove portion as a passageway. In other words, the water-stopping material spreads around the entire circumference of the inter-pipe end opening. Therefore, there is no need to apply the water-stopping material to each part of the entire circumference of the inter-pipe end opening. The front dam portion prevents the water-stopping material from leaking beyond the spiral groove portion toward the end of the rehabilitated pipe (the front side). The back dam portion prevents the water-stopping material from leaking beyond the spiral groove portion toward the opposite side of the end of the rehabilitated pipe (the back side). The water-stopping material is confined inside the closed spiral groove portion. Therefore, even if the existing pipe is, for example, a sewer pipe in service, the water-stopping material can be prevented from being washed away by running water in the existing pipe until it hardens after injection. As the water-stopping material hardens, the entire periphery of the pipe end opening is waterproofed.

[0008] It is preferable to attach a waterproof sheet having water-stopping properties and elasticity to the inner peripheral surface of the portion of the existing pipe corresponding to the pipe end, and then manufacture the pipe end of the rehabilitating pipe. The watertight sheet is particularly effective when the existing pipe is deteriorated. In other words, even if the inner peripheral surface of the existing pipe becomes uneven due to deterioration, the watertight sheet can be sandwiched between the inner peripheral surface of the existing pipe and the rib at the end of the rehabilitated pipe, so that the spiral groove portion can be reliably closed. This ensures that the watertight construction of the pipe end opening can be performed reliably.

[0009] In the dam forming step, it is preferable to remove a rib at a position corresponding to the front dam portion or the rear dam portion, and to dispose a block member that will become the front dam portion or the rear dam portion at the corresponding position. This allows the front dam section or the back dam section to be installed reliably.

[0010] In the dam forming step, it is preferable that a fitting piece having a shape that matches the cross section of the spiral groove is fitted into the spiral groove at a position corresponding to the front dam portion or the rear dam portion as the front dam portion or the rear dam portion. This allows the waterproofing material injected into the spiral groove portion to be securely blocked by the fitting piece.

[0011] In the dam forming step, it is preferable to fill a hardening material that will become the front dam portion or the rear dam portion in a position in the spiral groove that corresponds to the front dam portion or the rear dam portion. This makes it possible to easily form the front dam portion or the back dam portion.

[0012] The present invention relates to a pipe end seal structure provided at a pipe end opening between an outer periphery of a pipe end of a spiral rehabilitating pipe formed by helically winding a belt-shaped member having a plurality of ribs extending in the belt length direction on the outer periphery side so as to be attached to the inner periphery of an existing pipe, and the inner periphery of the existing pipe, a front dam portion and a back dam portion provided at positions spaced apart from each other by one pitch or more of the spiral groove defined by the plurality of ribs on the outer periphery of the pipe end portion; A water-stopping material is filled in a portion of the spiral groove between the front dam portion and the rear dam portion of the spiral groove; The present invention is characterized by comprising: The spiral groove portion, and therefore the water-stopping material, extends over at least one revolution in the winding direction, and therefore over the entire circumference of the inter-pipe end opening, thereby ensuring water-tightness at the inter-pipe end opening.

[0013] It is preferable that a waterproof sheet having water-stopping properties and elasticity is sandwiched between the inner surface of the existing pipe and the pipe end of the rehabilitated pipe, and that the entire spiral groove portion is covered by the waterproof sheet. This ensures that waterproofing of the pipe end openings can be performed reliably.

[0014] It is preferable that the front dam portion and the rear dam portion are arranged at the same positions in the circumferential direction of the pipe end portion and are connected or lined up in a straight line in the axial direction of the pipe end portion. This makes it possible to easily construct the front dam section and the rear dam section. Effect of the Invention

[0015] According to the present invention, it is possible to reliably stop water from entering the inter-pipe end opening between the existing pipe and a rehabilitating pipe that is attached to the inner periphery of the existing pipe and manufactured into a pipe. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a side cross-sectional view of an existing rehabilitated pipe to which a pipe-to-pipe end seal structure according to a first embodiment of the present invention has been applied. [Diagram 2] Fig. 2(a) is a cross-sectional view of a band-shaped member for rehabilitating the rehabilitated existing pipe, and Fig. 2(b) is a cross-sectional view showing how the rehabilitated pipe is manufactured from the band-shaped member. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4, showing the interpipe end opening seal structure during construction in a step of cutting off the rib to form the receiving groove. [Figure 4] FIG. 4 is a plan view taken along the line IV-IV in FIG. [Diagram 5] FIG. 5 is an enlarged cross-sectional side view of the inter-pipe end seal structure after construction, showing a circular portion V in FIG. [Figure 6] FIG. 6 is a plan view of the pipe end seal structure taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a side cross-sectional view taken along line VII-VII in FIG. 8, showing the pipe end opening seal structure according to the second embodiment of the present invention. [Figure 8] FIG. 8 is a plan view of the pipe end opening seal structure according to the second embodiment taken along line VIII-VIII in FIG. [Figure 9] FIG. 9 is a side cross-sectional view taken along line IX-IX in FIG. 10, showing the pipe end seal structure according to the third embodiment of the present invention. [Figure 10] FIG. 10 is a plan view of the pipe end opening seal structure according to the third embodiment taken along line XX in FIG. [Figure 11] FIG. 11 is a side cross-sectional view of a pipe end opening seal structure according to a fourth embodiment of the present invention. [Figure 12] FIG. 12 shows the pipe end seal structure according to the fifth embodiment of the present invention, and is a side cross-sectional view taken along line XII-XII in FIG. [Figure 13] FIG. 13 is a plan view of the pipe end opening seal structure according to the fifth embodiment taken along line XIII-XIII in FIG. [Figure 14] FIG. 14 is a side cross-sectional view of a pipe end opening seal structure according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 6)> As shown in Fig. 1, an existing pipe 1 to be rehabilitated in this embodiment is an aged sewer pipe. Note that the existing pipe to be rehabilitated is not limited to a sewer pipe, but may be a water supply pipe, an agricultural water pipe, a hydroelectric power generation water pipe, a gas pipe, a tunnel, etc.

[0018] A rehabilitation pipe 9 is installed along the inner circumference of an existing pipe 1. This rehabilitates the existing pipe 1. The rehabilitation pipe 9 is a spiral pipe made of a strip-shaped member 10 (profile). The material of the strip-shaped member 10 is a synthetic resin such as polyvinyl chloride.

[0019] As shown in Fig. 2(a), the belt-shaped member 10 includes a flat belt portion 11, male and female mating portions 13, 14, and a plurality of ribs 15 (three in the figure), and is formed into a certain cross-sectional shape. The female mating portion 13 is provided at one end of the flat belt portion 11 in the width direction, and the male mating portion 14 is provided at the other end of the flat belt portion 11 in the width direction. The female mating portion 13 has a mating groove 13a that opens to the inner periphery (the inner side of the rehabilitating pipe 9, the lower side in Fig. 2(a)), and is raised to the outer periphery (the outer side of the rehabilitating pipe 9, the upper side in Fig. 2(a)) and extends in the belt length direction. The male mating portion 14 protrudes from the flat belt portion 11 to the outer periphery and extends in the belt length direction.

[0020] The ribs 15 protrude from the flat belt portion 11 toward the outer periphery and extend in the belt length direction. A plurality of ribs 15 are arranged in parallel at intervals in the width direction of the flat belt portion 11. When distinguishing between these ribs 15, A, B, and C are added to their reference characters, respectively. The left and right ribs 15A and 15B with irregular cross sections protrude toward the outer periphery (upward in FIG. 2(a)) more than the central rib 15C with a T-shaped cross section. The cross-sectional shape of the belt-shaped member 10 shown in Fig. 2(a) is an example, and the cross-sectional shape of the belt-shaped member according to the present invention is not limited to the illustrated one and can be modified in various ways. For example, all the ribs may have the same height, or all the ribs may have the same cross-sectional shape. The number of ribs is not limited to three, but may be one, two, or four or more. The multiple ribs 15 may be connected at a portion other than the flat belt portion 11. The belt-shaped member 10 may be provided with a reinforcing material made of metal, fiber-reinforced resin, or the like.

[0021] As shown in FIG. 1, the belt-shaped member 10 is wound in a spiral shape so as to be attached to the inner circumference of the existing pipe 1, and is manufactured into a helical rehabilitation pipe 9. Hereinafter, one turn of the helically wound belt-shaped member 10 is referred to as a winding portion 10a. As shown in FIG. 2(b), the opposing male and female mating portions 13, 14 of adjacent winding portions 10a are mated with each other by projections and recesses. These mating portions 13, 14 form a mating ridge 16 that protrudes outward. The mating ridge 16 is lower than the ribs 15A, 15B. Adjacent winding portions may be connected via a separate connecting member.

[0022] As shown in Fig. 2(b), Fig. 3 and Fig. 4, in the rehabilitating pipe 9 having a helical tubular shape, the ribs 15 and the fitting protrusions 16 extend helically. The tops of the taller ribs 15A and 15B abut against the inner peripheral surface of the existing pipe 1. A helical groove 17 is formed between adjacent ribs 15A and 15B. Two (multiple) helical grooves 17 are formed by two (multiple) ribs 15A and 15B. Adjacent helical grooves 17 are separated by ribs 15A and 15B. When distinguishing between these helical grooves 17, one is referred to as the "intra-circumferential helical groove 17A" or "helical groove 17A" and the other is referred to as the "inter-circumferential helical groove 17B" or "helical groove 17B".

[0023] The inner spiral groove 17A is defined between two ribs 15A, 15B on the same winding portion 10a. A low rib 15C is disposed in the center of the spiral groove 17A. The inter-turn spiral groove 17B straddles two adjacent turn portions 10a and is defined between the opposing ribs 15B, 15A of these turn portions 10a. A fitting protrusion 16 is provided in the center of the spiral groove 17B. Although the intra-turn spiral groove 17A is wide and the inter-turn spiral groove 17B is narrow, the present invention is not limited to this.

[0024] As shown in Fig. 1, both pipe ends 9e of the rehabilitation pipe 9 face the manholes 4 at both ends of the existing pipe 1. As shown in Fig. 3, an annular inter-pipe end opening 20 is formed between the outer periphery of the pipe end 9e of the rehabilitation pipe 9 and the inner periphery of the existing pipe 1. As shown in Fig. 1, the inter-pipe end opening 20 is provided with an inter-pipe end opening seal structure 30.

[0025] As shown in Figs. 5 and 6, the inter-pipe end seal structure 30 includes a block member 31 and a water-stopping material 32. The block member 31 is formed in a rectangular parallelepiped shape. The material of the block member 31 is a synthetic resin such as polyvinyl chloride or polyethylene, but is not limited thereto, and may be a metal such as steel. The longitudinal direction of the block member 31 is oriented in the pipe axis direction of the rehabilitation pipe 9. The length dimension of the block member 31 is at least twice the width dimension of the band-shaped member 10. The height direction of the block member 31 is oriented in the pipe diameter direction of the rehabilitation pipe 9 (the up-down direction in Fig. 5). The height dimension of the block member 31 is substantially equal to the height of the ribs 15A and 15B. "Substantially" means that manufacturing tolerances and differences of about a few tenths of a millimeter are allowed.

[0026] The block member 31 is disposed at one location in the circumferential direction of the annular inter-pipe end opening 20. Preferably, the block member 31 is disposed at the upper end of the inter-pipe end opening 20, i.e., at the pipe top portion 9p of the pipe end 9e of the rehabilitation pipe 9. As shown in Figures 3 and 4, the ribs 15 and fitting protrusions 16 are cut out from the portion 9p where the block member 31 is disposed. As a result, an accommodation groove 9q extending in the pipe axial direction is formed in the pipe top portion 9p of the pipe end 9e. The block member 31 is accommodated in the accommodation groove 9q.

[0027] 5 and 6, the block member 31 spans two adjacent winding portions 10a of the band-shaped member 10 at the pipe end 9e of the rehabilitation pipe 9. The front side portion of the block member 31 from the longitudinal center to the end on the manhole 4 side constitutes the front side dam portion 31a. The rear side portion of the block member 31 from the longitudinal center to the rear side (opposite the manhole 4) end constitutes the rear side dam portion 31b.

[0028] The front dam portion 31a and the rear dam portion 31b are provided at positions shifted by exactly one pitch on the outer periphery of the pipe end 9e along the winding direction of the belt-shaped member 10. The front dam portion 31a and the rear dam portion 31b are disposed at the same position (preferably at the pipe top) in the pipe circumferential direction of the pipe end 9e, and are connected in a straight line along the pipe axial direction of the pipe end 9e.

[0029] As shown in Figures 5 and 6, the block member 31 forms a plurality of closed spiral groove portions 18. In detail, the front side dam portion 31a of the block member 31 closes the intra-circumferential spiral groove 17A of the first circular portion 10a1 from the front side (the manhole 4 side, the left side in Figure 5) of the pipe end portion 9e, and the inter-circumferential spiral groove 17B spanning the first and second circular portions 10a1 and 10a2. The back side dam portion 31b of the block member 31 closes the intra-circumferential spiral groove 17A of the second circular portion 10a2, and the inter-circumferential spiral groove 17B spanning the second and third circular portions 10a2 and 10a3.

[0030] As a result, in the intra-turn spiral groove 17A, a one-pitch spiral groove portion 18A spanning the turn portions 10a1-10a2 from the first turn to the second turn is a closed space. Also, in the inter-turn spiral groove 17B, a one-pitch spiral groove portion 18B spanning the turn portions 10a1, 10a2-10a2, 10a3 from the first and second turns to the second and third turns is a closed space. The closed space, i.e., the spiral groove portion 18 (18A, 18B), is defined by the ribs 15A, 15B, the dam portions 31a, 31b, the flat belt portion 11, and the inner peripheral surface of the existing pipe 1. Both ends of the spiral groove portion 18 are closed by the dam portions 31a, 31b.

[0031] A water-stopping material 32 is injected and filled into each spiral groove portion 18. The water-stopping material 32 has fluidity when injected and has a hardening property to harden thereafter. Preferably, the water-stopping material 32 has an expansive property to expand during the hardening reaction. More preferably, the water-stopping material 32 is made of a foaming resin such as a urethane foaming resin. This provides a waterproofing treatment to the inter-pipe end opening 20. As shown in FIG. 1, a pipe end seal structure 30 is provided at each of the pipe ends 9e on both sides of the rehabilitating pipe 9, so that the pipe end openings 20 on both sides of the rehabilitating pipe 9 are waterproofed.

[0032] The pipe end port 20 is waterproofed as follows. <Pipe manufacturing process> First, a pipe making machine (not shown) is used to attach the rehabilitating pipe 9 to the inner circumference of the existing pipe 1. The rehabilitating pipe 9 may be attached by making the pipe with a slightly enlarged diameter (see Patent Documents 1 and 2, etc.), or the band-shaped member 10 may be attached by forming the cross-sectional shape such that the diameter is enlarged as the pipe is made (see Patent Document 3, etc.), or the rehabilitating pipe 9 may be attached by making the pipe into a small diameter and then expanding the circumference (see Patent Document 4, etc.). The pipe making machine may be of a self-propelled type (see Patent Documents 1 and 2, etc.), or of a push type or tow type (see Patent Document 4, etc.).

[0033] <Cutting process, groove formation process> 3 and 4, the rib 15 and the fitting protrusion 16 are cut off at the pipe top portion 9p (at a position corresponding to the weir portions 31a, 31b (FIG. 5)) of the pipe end portion 9e of the produced rehabilitating pipe 9. This forms an accommodation groove 9q in the pipe top portion 9p.

[0034] <Weir formation process> The block member 31 is inserted into the accommodation groove 9q to be installed. The front side portion of the block member 31 becomes the front side dam portion 31a, and the back side portion becomes the back side dam portion 31b. In other words, the front side dam portion 31a and the back side dam portion 31b are formed at positions one pitch apart from each other of the multiple spiral grooves 17 (dam formation process). The block member 31 can be easily installed by simply inserting it straight from the manhole 4 side to the back side along the pipe axis direction into the pipe top portion 9p. Moreover, by placing one block member 31 at the pipe top portion 9p, both the front side dam portion 31a and the back side dam portion 31b can be constructed at the same time. The multiple spiral groove portions 18 are formed by these dam portions 31a and 31b. Each spiral groove portion 18 has a length that goes around the rehabilitation pipe 9 in the winding direction. Both ends of the spiral groove portion 18 are closed by the dam portions 31a, 31b. Furthermore, each spiral groove portion 18 is closed by the dam portions 31a, 31b, the ribs 15A, 15B, the flat belt portion 11, and the existing pipe 1.

[0035] <Filling process> Next, the water-stopping material 32 is filled into each of the spiral groove portions 18. Specifically, for example, a urethane foam resin raw material is injected into the spiral groove portions 18 and foamed. As an injection method, for example, a part of the pipe end 9e is turned up to create a gap between the side surface of the block member 31 or the inner peripheral surface of the existing pipe 1, and a nozzle is inserted from there into the spiral groove portion 18 to inject the water-stopping material 32 from the nozzle. A nozzle opening may be drilled in the pipe end 9e, a nozzle is inserted into the nozzle opening to inject the water-stopping material 32, and then the nozzle opening may be closed. Alternatively, a water-stopping material injection path facing the spiral groove portion 18 may be formed inside the block member 31, and the block member 31 may also serve as a water-stopping material injection nozzle.

[0036] It is sufficient to inject the water-stopping material 32 into one place in the spiral groove portion 18, and there is no need to apply the water-stopping material to each part of the entire circumference of the pipe end opening 20. The water-stopping material 32 injected into the one place spreads around the entire circumference of the pipe end opening 30 through the spiral groove portion 18. Moreover, since the spiral groove portion 18 is closed, the water-stopping material 32 can be prevented from leaking out of the spiral groove portion 18. In particular, the front side weir portion 31a prevents the water-stopping material 32 from leaking out of the spiral groove portion 18 toward the pipe end side (front side) of the rehabilitated pipe 9. The back side weir portion 31b prevents the water-stopping material 32 from leaking out of the spiral groove portion 18 toward the opposite side (back side) of the pipe end of the rehabilitated pipe 9. This allows the injection amount of the water-stopping material 32 to be kept to a minimum. The water-stopping material 32 is confined inside the closed spiral groove portion 18. Therefore, even if the existing pipe 1 is a sewer pipe in service, the water-stopping material 32 can be prevented from being washed away by running water in the existing pipe 1 until it hardens after injection.

[0037] Eventually, the water-stopping material 32 hardens. In this way, the inter-pipe end opening seal structure 30 is constructed, and the entire periphery of the inter-pipe end opening 20 can be sealed. This prevents sewage from entering between the existing pipe 1 and the rehabilitated pipe 9 from the inter-pipe end opening 20, and prevents groundwater that has flowed between the existing pipe 1 and the rehabilitated pipe 9 by penetrating a defective part of the existing pipe 1 from leaking out from the inter-pipe end opening 20 into the manhole 4.

[0038] Next, another embodiment of the present invention will be described. In the following embodiment, the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will be omitted. <Second embodiment (FIGS. 7 and 8)> As shown in Figures 7 and 8, the pipe-to-pipe end opening seal structure 30B of the second embodiment is suitable for cases where the inner peripheral surface of the existing pipe 1 has become uneven due to deterioration. The pipe-to-pipe end opening seal structure 30B includes a water stop sheet 33 in addition to the block members 31 constituting the weir portions 31a, 31b and the water stop material 32 in the spiral groove portion 18. The water stop sheet 33 has a water stop function that prevents water from passing through, and also has elasticity that allows elastic compression deformation at least in the thickness direction. The water stop sheet 33 is preferably made of rubber.

[0039] The water stop sheet 33 is formed in a cylindrical shape. The axial length of the water stop sheet 33 is approximately equal to the length dimension of the block member 31. The circumferential length of the water stop sheet 33 is substantially equal to the inner circumferential length of the existing pipe 1 or the outer circumferential length of the rehabilitation pipe 9.

[0040] The water stop sheet 33 is sandwiched between the inner periphery of the existing pipe 1 and the pipe end 9e of the rehabilitation pipe 9. The water stop sheet 33 covers the entire area of ​​the multiple spiral groove portion 18 and the block member 31.

[0041] As shown in Fig. 8, the waterstop sheet 33 is deformed to fit the irregularities of the inner peripheral surface of the existing pipe 1. In addition, the tops of the ribs 15A, 15B that define the spiral groove portion 18 are pressed firmly against the waterstop sheet 33, and the portions of the waterstop sheet 33 that correspond to the ribs 15A, 15B are compressed in the thickness direction. Furthermore, as shown in Fig. 7, the block member 31 is pressed firmly against the waterstop sheet 33, and the portions of the waterstop sheet 33 that correspond to the block member 31 are compressed in the thickness direction. In the figure, the thickness of the waterproof sheet 33 is exaggerated.

[0042] When constructing the inter-pipe end seal structure 30B, prior to manufacturing the pipe end 9e of the rehabilitating pipe 9, a water stop sheet 33 is attached to the entire inner periphery of the pipe end 1e (the portion corresponding to the pipe end of the rehabilitating pipe 9) of the existing pipe 1 using an adhesive (not shown). Then, the pipe end 9e of the rehabilitating pipe 9 is manufactured so as to be attached to the inner periphery of the existing pipe 1. This brings the tops of the ribs 15A, 15B into close contact with the water stop sheet 33.

[0043] Next, the rib 15 and the fitting protrusion 16 of the pipe top 9p are cut away to form a receiving groove 9q, and the block member 31 is inserted therein. If the block member 31 experiences frictional resistance from the waterstop sheet 33 at this time, the pipe top 9p is pressed down slightly to make it easier to insert the block member 31. After insertion, the block member 31 is in close contact with the waterstop sheet 33. This reliably forms a closed space in the spiral groove portion 18. Even if the inner peripheral surface of the existing pipe 1 has become uneven due to deterioration, and therefore the adhesion of the rehabilitated pipe 9 is insufficient, particularly in the recessed portions, the spiral groove portion 18 can be reliably sealed by the water stop sheet 33. Thereafter, the sealed spiral groove portion 18 is filled with a water-stopping material 32. This allows the interpipe end opening 20 to be securely sealed.

[0044] <Third embodiment (FIGS. 9 and 10)> 9 and 10, in the inter-pipe end opening seal structure 30C of the third embodiment, four (plural) fitting pieces 41, 42, 43, 44 are used as the front-side dam portion and the rear-side dam portion instead of the rectangular parallelepiped block member 31 of the first embodiment (FIGS. 5 and 6). Also, the rib 15 and the fitting protrusion 16 at positions corresponding to the front-side dam portion and the rear-side dam portion are left as they are without being cut out.

[0045] The material of the fitting pieces 41, 42, 43, 44 is a synthetic resin such as polyvinyl chloride or polyethylene, but is not limited to this and may be a metal such as steel. The two fitting pieces 41, 42 on the side closer to the manhole 4 (the near side, the left side in FIG. 9) constitute the near side dam portion. The fitting piece 41 is formed in a shape that matches the cross section of the inner-circumferential spiral groove 17A, and is fitted into the near side end of the spiral groove portion 18A. The fitting piece 42 is formed in a shape that matches the cross section of the inter-circumferential spiral groove 17B, and is fitted into the near side end of the spiral groove portion 18B.

[0046] The two fitting pieces 43, 44 on the side farther from the manhole 4 (the back side, the right side in FIG. 9) constitute the back side dam portion. The fitting piece 43 is formed in the same shape as the fitting piece 41 to match the cross-sectional shape of the inner-circumferential spiral groove 17A, and is fitted into the back end of the spiral groove portion 18A. The fitting piece 44 is formed in the same shape as the fitting piece 42 to match the cross-sectional shape of the inter-circumferential spiral groove 17B, and is fitted into the back end of the spiral groove portion 18B. These fitting pieces 41, 42, 43, 44 are arranged in a straight line in the pipe axial direction of the pipe top portion 9p of the rehabilitation pipe 9.

[0047] When constructing the pipe end seal structure 30B, the fitting pieces 41, 42, 43, 44 are fitted into the spiral groove 17 at positions corresponding to the dam portions in parallel with or before or after the pipe making of the pipe end 9e of the rehabilitation pipe 9 (dam forming process). For example, when making a pipe from the back side (right side in Fig. 9) of the rehabilitating pipe 9 to the front side (left side in Fig. 9), after making the circumferential portion 10a2, the pipe making machine is stopped once and the fitting pieces 44 and 43 are fitted into positions corresponding to the back side dam portion. When fitting, the circumferential portion 10a2 is elastically deformed to ensure a fitting allowance.

[0048] Next, the pipe making machine is driven again to make the circumferential portion 10a1. Then, the pipe making machine is stopped and the fitting pieces 42 and 41 are fitted into positions corresponding to the front side dam portion. When fitting, the circumferential portion 10a1 is elastically deformed to ensure a fitting margin. This closes the spiral groove portion 18 . Thereafter, the spiral groove portion 18 is filled with a water-stopping material 32.

[0049] <Fourth embodiment (FIG. 11)> 11, the pipe end opening seal structure 30D of the fourth embodiment includes a dam portion consisting of fitting pieces 41, 42, 43, 44 similar to the third embodiment (FIGS. 9 and 10), and further includes a waterstop sheet 33 similar to the second embodiment (FIGS. 7 and 8). The waterstop sheet 33 is sandwiched between the inner periphery of the existing pipe 1 and the outer periphery of the pipe end 9e of the rehabilitation pipe 9, so that the ribs 15A, 15B and the fitting pieces 41, 42, 43, 44 at the pipe end 9e are closely attached to the waterstop sheet 33.

[0050] <Fifth embodiment (FIGS. 12 to 13)> 12 and 13, in a pipe end seal structure 30E of the fifth embodiment, a hardening material 50 is filled in a pipe top 9p of a pipe end 9e of a rehabilitation pipe 9 instead of the fitting pieces 41, 42, 43, 44 of the third embodiment (FIGS. 9 and 10). As the material for the hardening material, for example, quick-setting mortar, epoxy putty, etc. are used.

[0051] The hardener 50 constitutes front dam portions 51, 52 and rear dam portions 53, 54. The front dam portion 51 is disposed at the front end of the spiral groove portion 18A. The front dam portion 52 is disposed at the front end of the spiral groove portion 18B. The rear dam portion 53 is disposed at the rear end of the spiral groove portion 18A. The rear dam portion 54 is disposed at the rear end of the spiral groove portion 18B.

[0052] When constructing the inter-pipe end seal structure 30E, after the pipe end 9e of the rehabilitation pipe 9 is manufactured, the pipe top 9p is turned up and a nozzle is inserted to fill the hardening material 50 that will become the front side dam parts 51, 52 and the back side dam parts 53, 54. After waiting for the hardening material 50 to harden, the water stop sheet 33 is filled into the spiral groove part 18.

[0053] <Sixth embodiment (FIG. 14)> 14, the pipe end opening seal structure 30F of the sixth embodiment includes dam sections 51, 52, 53, 54 made of a hardening material 50 similar to that of the fifth embodiment (FIGS. 12 and 13), and further includes a waterstop sheet 33 similar to that of the second embodiment (FIGS. 7 and 8). The waterstop sheet 33 is sandwiched between the inner periphery of the existing pipe 1 and the outer periphery of the pipe end 9e of the rehabilitating pipe 9, so that the ribs 15A, 15B and the hardening material 50 at the pipe end 9e are in close contact with the waterstop sheet 33.

[0054] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the central rib 15C may be formed at the same height as the ribs 15A, 15B at both ends and abut against the inner circumference of the existing pipe 1 or the water-stopping sheet 3, thereby dividing the spiral groove 17A into two. The fitting protrusion 16 may be formed at the same height as the ribs 15A, 15B and may abut against the inner circumference of the existing pipe 1 or the waterstop sheet 3, thereby dividing the spiral groove 17B into two. The fitting protrusion 16 may constitute one of the ribs that define the spiral groove. The front dam portion 31a and the rear dam portion 31b in the first embodiment (FIGS. 5 and 6) may be formed of separate block members and may be separable. The front dam portion 31a and the rear dam portion 31b, which are separate from each other, may be arranged in a straight line in the tube axial direction by being shifted by exactly one pitch along the winding direction of the belt-shaped member 10, or may be arranged at different positions in the tube circumferential direction by being shifted by more than one pitch (more than one revolution) along the winding direction of the belt-shaped member 10. In the third embodiment (Figs. 9 and 10) and the fourth embodiment (Fig. 11), the front fitting pieces 41, 42 and the rear fitting pieces 43, 44 need only be spaced apart from each other by one pitch or more along the winding direction of the rehabilitating pipe 9, and do not necessarily need to be arranged in a straight line in the axial direction of the rehabilitating pipe 9, and may be arranged offset from each other in the circumferential direction of the rehabilitating pipe 9. The same applies to the dam sections 51-54 formed of the hardener 50 in the fifth embodiment (Figs. 12 and 13) and sixth embodiment (Fig. 14). The front dam portion and the rear dam portion may be made of different materials and have different structures. For example, one of the front dam portion and the rear dam portion may be a block member that is installed by cutting out the rib 15, and the other of the front dam portion and the rear dam portion may be a fitting piece that is fitted into the spiral groove 17 without cutting out the rib. One of the front dam portion and the rear dam portion may be a block member or a fitting piece, and the other of the front dam portion and the rear dam portion may be the hardener 50. [Industrial Applicability]

[0055] The present invention can be applied to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0056] 1 Existing pipes 9 Rehabilitation pipe 9e Tube end 9p Pipe top (where the block part is placed, corresponding to the weir part) 9q Storage Groove 10 Belt-shaped member (profile) 10a Circular section 10a11th lap 10a22nd lap 10a33rd lap 15 Ribs 17 Spiral groove 18 Spiral groove part 20 End port between pipes 30 End seal structure between pipes 30B~30F End seal structure between pipes 31 Block material 32 Water-stopping material 31a Front side dam 31b Back weir 32 Water-stopping material 33 Waterproof Sheet 41, 42 Fitting piece (front gate part) 43,44 Fitting piece (inner dam section) 50 Hardening material 51,52 Front side dam 53,54 Back side dam

Claims

1. A method for sealing an inter-pipe end opening between an outer periphery of a pipe end of a spiral rehabilitating pipe formed by helically winding a belt-shaped member having a plurality of ribs formed on an outer periphery side thereof extending in a belt length direction around an inner periphery of an existing pipe, the method comprising the steps of: a dam forming step of forming a front dam portion and a back dam portion at positions spaced apart from each other by one or more pitches in the spiral groove defined by the plurality of ribs on the outer periphery of the pipe end portion; a filling step of filling a water-stopping material into a portion of the spiral groove between the front dam portion and the rear dam portion; A pipe end sealing method comprising:

2. A method for sealing pipe ends according to claim 1, characterized in that a waterproof sheet having waterproofing properties and elasticity is attached to the inner surface of the portion of the existing pipe corresponding to the pipe end, and then the pipe end of the rehabilitated pipe is manufactured.

3. 3. The pipe-to-pipe end sealing method according to claim 1 or 2, characterized in that in the formation process of at least one of the front dam portion and the rear dam portion formed in the dam formation process, a rib is removed at a position corresponding to one of the dam portions, and a block member which will become the one of the dam portions is placed at the corresponding position.

4. 3. A pipe-to-pipe end sealing method as described in claim 1 or 2, characterized in that in the process of forming at least one of the front dam portion and the rear dam portion in the dam forming process, a fitting piece shaped to match the cross section of the spiral groove is fitted into the spiral groove at a position corresponding to the one dam portion.

5. The pipe-to-pipe end sealing method according to claim 1 or 2, characterized in that in the dam forming process, in the process of forming at least one of the front dam portion and the rear dam portion, a hardening material that will become the one dam portion is filled at a position in the spiral groove corresponding to the one dam portion.

6. A pipe end seal structure is provided at a pipe end opening between an outer periphery of a pipe end of a spiral pipe rehabilitating pipe formed by helically winding a belt-shaped member having a plurality of ribs formed on an outer periphery side thereof extending in a belt length direction so as to be attached to an inner periphery of an existing pipe, and an inner periphery of the existing pipe, a front dam portion and a back dam portion provided at positions spaced apart from each other by one or more pitches of the spiral groove defined by the plurality of ribs on the outer periphery of the pipe end portion; A water-stopping material is filled in a portion of the spiral groove between the front dam portion and the rear dam portion of the spiral groove; A pipe end seal structure comprising:

7. The pipe-to-pipe end seal structure described in claim 6, characterized in that a waterproof sheet having water-stopping properties and elasticity is sandwiched between the inner surface of the existing pipe and the pipe end of the rehabilitated pipe, and the entire spiral groove portion is covered by the waterproof sheet.

8. The pipe end sealing structure according to claim 6 or 7, characterized in that the front side dam portion and the rear side dam portion are arranged at the same position in the circumferential direction of the pipe end portion and are connected or lined up in a straight line in the axial direction of the pipe end portion.

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