Water-stopping method and water-stopping structure

Abstract

To provide a water cut-off method capable of improving workability.SOLUTION: This water cut-off method for cutting off water between an existing pipe 2 connected at the end to a manhole 1 and a rehabilitation pipe 3 provided inside the existing pipe 2 comprises: a groove forming step of forming, on the inner peripheral surface of the end, a groove 12 displaced in the extending direction of the existing pipe 2 so as to be along the end surface 2a of the existing pipe 2; a fitting step of fitting water growth rubber 13 to the groove 12; and a chamfering step of chamfering the upper part of the inner peripheral surface of the end to form a chamfered part 11. In the groove forming step, the groove 12 is formed below the chamfered part 11 so as to be connected to the chamfered part 11. In the fitting step, the water growth rubber 13 is fitted over the groove 12 and the chamfered part 11.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a water stop method and a water stop structure technique for stopping water between an existing pipe connected to a manhole and a rehabilitation pipe provided inside the existing pipe.

Background Art

[0002] Conventionally, a technique for stopping water between an existing pipe connected to a manhole and a rehabilitation pipe provided inside the existing pipe has been known. For example, it is as described in Patent Document 1.

[0003] In the water stop structure described in Patent Document 1, the rehabilitation pipe is provided so as to protrude into the manhole from inside the existing pipe. The water stop structure includes a water stop joint for stopping water between the rehabilitation pipe and the existing pipe. The water stop joint includes a cylindrical portion and a flange portion. The cylindrical portion is fixed to a portion of the outer peripheral surface of the rehabilitation pipe that protrudes into the manhole. The flange portion is adhered to the inner peripheral surface of the manhole side wall. Thereby, the water stop joint can stop water between the inner peripheral surface of the rehabilitation pipe and the outer peripheral surface of the existing pipe.

[0004] However, in the water stop structure described in Patent Document 1, in order to secure a space for installing the water stop joint, it is necessary to largely cut out the invert formed at the bottom of the manhole, and the workability was poor.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] One aspect of the present disclosure has been made in view of the above situation, and the problem to be solved is to provide a water stop method and a water stop structure capable of improving workability. [Means for solving the problem]

[0007] The problem that one aspect of this disclosure aims to solve is as described above, and the means for solving this problem will now be explained.

[0008] One embodiment of the present disclosure provides a method for sealing off water between an existing pipe whose end is connected to a manhole and a rehabilitation pipe provided inside the existing pipe, comprising: a groove forming step of forming a groove on the inner circumferential surface of the end of the pipe that is displaced in the direction of extension of the existing pipe so as to be along the end face of the existing pipe; and an attachment step of attaching a water-sealing material to the groove. According to one aspect of this disclosure, workability can be improved.

[0009] In one embodiment of the present disclosure, the method further comprises a chamfering step of chamfering the upper part of the inner circumferential surface of the end portion to form a chamfered portion, in the groove forming step, forming the groove portion below the chamfered portion so as to connect with the chamfered portion, and in the mounting step, attaching the water-stopping material across the groove portion and the chamfered portion. According to one aspect of this disclosure, workability can be improved by forming not only grooves but also chamfered sections that are relatively easy to construct.

[0010] In one embodiment of the present disclosure, the installation step is performed after the rehabilitated pipe has been installed in the existing pipe. According to one aspect of this disclosure, when the rehabilitated pipe is transported inside the existing pipe, the water-sealing material does not get caught in the rehabilitated pipe, thus preventing malfunctions from occurring.

[0011] In one embodiment of the present disclosure, the groove is formed in the groove portion corresponding to the invert formed in the manhole during the groove formation process. According to one aspect of this disclosure, waterproofing material can be installed without extensively chipping away at the invert, thereby improving workability.

[0012] In one embodiment of the present disclosure, there is a water-stopping structure for stopping water from flowing between an existing pipe whose end is connected to a manhole and a rehabilitation pipe provided inside the existing pipe, comprising: a groove formed on the inner circumferential surface of the end so as to be displaced along the end face of the existing pipe in the direction of extension of the existing pipe; and a water-stopping material attached to the groove. According to one aspect of this disclosure, workability can be improved.

[0013] In one embodiment of the present disclosure, the existing pipe further comprises a chamfered portion formed by chamfering the upper part of the inner circumferential surface, the groove portion is formed below the chamfered portion so as to connect with the chamfered portion, and the water-stopping material is attached across the groove portion and the chamfered portion. According to one aspect of this disclosure, workability can be improved by forming not only grooves but also chamfered sections that are relatively easy to construct.

[0014] In one embodiment of this disclosure, the water-stopping material is installed in multiple locations. According to one aspect of this disclosure, water can be effectively sealed between the existing pipe and the rehabilitated pipe by using multiple water-sealing materials.

[0015] In one embodiment of this disclosure, the water-stopping material is composed of a water-swelling material that swells by absorbing water. According to one aspect of this disclosure, when water flows between the existing pipe and the rehabilitated pipe, the water-swelling material swells, thereby effectively stopping water flow between the existing pipe and the rehabilitated pipe.

[0016] In one embodiment of the present disclosure, the invention further comprises a repair material for repairing the chamfered portion, and a reinforcing member fixed to at least one of the existing pipe or the manhole and covered by the repair material. According to one aspect of this disclosure, the repair material can be firmly fixed, and consequently, a watertight structure can be firmly formed.

[0017] In one aspect of the present disclosure, the groove portion is formed in a portion corresponding to an invert formed in the manhole. According to one aspect of the present disclosure, since the waterstop material can be attached without largely hooking the invert, the workability can be improved.

Effects of the Invention

[0018] According to one aspect of the present disclosure, the workability can be improved.

Brief Description of the Drawings

[0019] [Figure 1] Side cross-sectional view showing a manhole and an existing pipe. [Figure 2] (a) Cross-sectional view taken along line A1 - A1. (b) Cross-sectional view taken along line A2 - A2. [Figure 3] Side cross-sectional view showing a waterstop structure according to an embodiment of the present invention. [Figure 4] Flowchart showing a method of constructing a waterstop structure. [Figure 5] Side cross-sectional view showing a region for chamfering an existing pipe. [Figure 6] (a) Front view showing a guide member. (b) Also, side view. [Figure 7] (a) Front view showing a state where the guide member is installed on an existing pipe. (b) Cross-sectional view taken along line A3 - A3. [Figure 8] (a) Side view showing a sander and a jig for forming a groove portion. (b) Also, rear view. [Figure 9] Side cross-sectional view showing a state of forming a groove portion. [Figure 10] Also, rear view. [Figure 11] Side cross-sectional view showing a chamfered portion and a groove portion. [Figure 12] (a) Side cross-sectional view showing a state where a water-swellable rubber and a wire are attached. (b) Cross-sectional view taken along line A4 - A4.

Modes for Carrying Out the Invention

[0020] In the following explanation, the directions indicated by arrows U, D, F, B, L, and R in the diagram will be defined as upward, downward, forward, backward, left, and right, respectively.

[0021] The following describes a water-stopping structure 10 according to one embodiment of the present invention.

[0022] The watertight structure 10 is for preventing water from entering between the existing pipe 2 connected to the manhole 1 and the rehabilitated pipe 3 installed inside the existing pipe 2. Below, we will first describe the manhole 1 and the existing pipe 2 with reference to Figures 1 to 3.

[0023] The manhole 1 is a vertical hole opened in the ground G. The manhole 1 in this embodiment has an inner wall portion 1a that is formed in a substantially circular shape when viewed from above. The lower part of the inner wall portion 1a is formed to have a larger inner diameter than the upper part. An invert 1b is formed at the bottom of the manhole 1. The invert 1b is a semicircular groove formed to be open at the top. The invert 1b is formed from the front end to the rear end of the manhole 1.

[0024] Existing pipe 2 is intended to form a waterway (sewer) underground. Existing pipe 2 is configured to connect manhole 1, shown in Figure 1, with other manholes. In this embodiment, existing pipe 2 is formed in a substantially cylindrical shape with its longitudinal direction oriented in the front-to-back direction and is connected to the lower part of manhole 1. Figure 1 shows existing pipes 2 connected to the front lower end and rear lower end of manhole 1 as an example. In the following, the configuration of existing pipe 2 will be explained using existing pipe 2 connected to the rear lower end of manhole 1 as an example.

[0025] As shown in Figure 2(a), the front end of the existing pipe 2 is connected to the manhole 1. The end face (front end face) 2a of the existing pipe 2 is formed to be flush with the inner wall portion 1a of the manhole 1. In this embodiment, the end face 2a of the existing pipe 2 is formed in a roughly arc shape (curved surface) in plan view along the inner wall portion 1a. The lower part (for example, the lower half) of the end face 2a of the existing pipe 2 is abutted against the invert 1b. This connects the existing pipe 2 and the manhole 1 so that there is no step between the invert 1b and the existing pipe 2, allowing sewage to flow smoothly within the manhole 1.

[0026] Here, if the existing pipe 2 shown in Figures 1 and 2 deteriorates, its strength may decrease, or cracks may develop, potentially allowing water (infiltration) or sediment to flow into the pipe 2. To address or prevent such problems, a rehabilitation pipe 3 may be installed inside the existing pipe 2. Below, an example of the construction procedure for the rehabilitation pipe 3 will be explained with reference to Figure 3.

[0027] The rehabilitated pipe 3 shown in Figure 3 is made of resin. The rehabilitated pipe 3 is moved to the vicinity of the opening of the manhole 1 in a transportable state (for example, wound around a core material, or stacked in a zigzag pattern), and then transported from the manhole 1 into the existing pipe 2. At this time, the cross-section of the rehabilitated pipe 3 is appropriately deformed so that it can pass through the existing pipe 2. After being transported to pass through the existing pipe 2, the tip (front end) of the rehabilitated pipe 3 is cut off and deformed to adhere closely to the inner circumferential surface of the existing pipe 2.

[0028] By installing the rehabilitated pipe 3 inside the existing pipe 2 in this way, the function of the pipeline is restored, and the inflow of water and other substances into the existing pipe 2 through cracks that have formed in the existing pipe 2 can be suppressed.

[0029] However, if water enters the crack, there is a concern that some of the water may leak into the manhole 1 by traveling between the inner surface of the existing pipe 2 and the outer surface of the rehabilitated pipe 3. The water-stopping structure 10 of this embodiment prevents water from leaking into the manhole 1 by sealing the space between the existing pipe 2 and the rehabilitated pipe 3. This will be explained in detail below.

[0030] As shown in Figure 3, the water-stopping structure 10 comprises a chamfered portion 11, a grooved portion 12, a water-swellable rubber 13, a repair material 14, and a wire 15.

[0031] The chamfered portion 11 is the chamfered portion on the inner circumferential surface of the existing pipe 2. The chamfered portion 11 is formed by chamfering the upper part of the end face 2a of the existing pipe 2. As described above, the lower part (lower half) of the end face 2a in this embodiment abuts against the invert 1b. The chamfered portion 11 in this embodiment is formed on the part of the end face 2a that is not abutting against the invert 1b (the upper half).

[0032] The groove 12 is an elongated recess formed on the inner surface of the existing pipe 2. In this embodiment, the groove 12 has a roughly U-shaped cross-section. The groove 12 is formed on the lower part of the inner surface of the existing pipe 2 (below the chamfered portion 11). Specifically, the groove 12 is formed in the same height range as the invert 1b, that is, in the lower half of the inner surface of the existing pipe 2. Thus, the groove 12 in this embodiment is formed on the inner surface of the existing pipe 2 in the portion corresponding to the invert 1b. The upper end of the groove 12 is connected to the lower end of the chamfered portion 11 (see Figure 11).

[0033] The water-swellable rubber 13 is used to stop water from entering between the existing pipe 2 and the rehabilitated pipe 3. The water-swellable rubber 13 is formed in an annular shape. The cross-section of the water-swellable rubber 13 is formed in a substantially circular shape. The water-swellable rubber 13 swells by absorbing water, and its cross-section can be expanded. The water-swellable rubber 13 is attached across the chamfered portion 11 and grooved portion 12 of the existing pipe 2. In this embodiment, multiple (two) water-swellable rubbers 13 are attached to one chamfered portion 11 and grooved portion 12. The number of water-swellable rubbers 13 to be installed is not limited to this embodiment (two) and can be changed as appropriate.

[0034] The repair material 14 is for repairing (filling) the chamfered portion 11. The repair material 14 is made up of mortar or resin-based putty, and is filled into the chamfered portion 11. The repair material 14 is also applied to the inner wall portion 1a of the manhole 1 (around the existing pipe 2).

[0035] The wire 15 shown in Figure 12(a) is for firmly securing the repair material 14. The wire 15 is fixed to the inner wall 1a of the manhole 1 by wrapping it around a nail 15a driven into the inner wall 1a (around the chamfered portion 11 and the water-swellable rubber 13). The wire 15 is covered by the repair material 14 shown in Figure 3. Note that the wire 15 only needs to be fixed to at least one of the existing pipe 2 or the inner wall 1a of the manhole 1, and does not necessarily need to be fixed to the inner wall 1a as in this embodiment.

[0036] According to the water-stopping structure 10, when infiltrating water travels from the inner surface of the existing pipe 2 to the outer surface of the rehabilitated pipe 3 toward the manhole 1, the water-swelling rubber 13 absorbs the infiltrating water. As a result, the water-swelling rubber 13 swells and can effectively stop water from leaking between the existing pipe 2 and the rehabilitated pipe 3. Therefore, it is possible to suppress the leakage of infiltrating water into the manhole 1 and reduce the amount of wastewater that can be treated at the sewage treatment facility.

[0037] Furthermore, in the water-stopping structure 10, when an external force is applied to the repair material 14, the repair material 14 catches on the wire 15, thus firmly fixing the repair material 14. This allows for the formation of a strong water-stopping structure 10. Alternatively, the wire 15 may be positioned relatively close to the water-swelling rubber 13 so that the water-swelling rubber 13 catches on the wire 15 when it swells. This allows the wire 15 to hold the water-swelling rubber 13, improving the sealing force of the water-swelling rubber 13 and effectively stopping water from entering between the existing pipe 2 and the rehabilitated pipe 3.

[0038] The following describes an example of a method for constructing the aforementioned watertight structure 10 (watertight method). In this embodiment, the construction of the watertight structure 10 is started before the rehabilitation pipe 3 is installed in the existing pipe 2.

[0039] As shown in Figure 4, in the construction of the watertight structure 10, a chamfering process S10 is first performed to chamfer the existing pipe 2. As shown in area R in Figure 5, in the chamfering process S10, the upper part of the inner circumferential surface of the end face 2a is chamfered. In this way, a chamfered portion 11 of a certain width is formed on the existing pipe 2. For example, a chamfered portion 11 with a width of about 25 mm is formed. Note that the width of the chamfered portion 11 is not particularly limited.

[0040] As shown in Figure 4, after the chamfering process S10, an installation process S20 is performed to install the guide member 20. The guide member 20 shown in Figure 6 is a member for guiding the sander 40, which will be described later. The guide member 20 is formed in a substantially L-shape when viewed from the side. The guide member 20 comprises a mounting portion 21, an engaging portion 22, and a through hole 23.

[0041] The mounting section 21 is the part on which the jack 30, which will be described later, is placed. The mounting section 21 is formed in the shape of a plate with its surface oriented vertically.

[0042] The engaging portion 22 is the part that engages with the jig 50, which will be described later. The engaging portion 22 is formed in a plate shape with its plate surface facing approximately in the front-to-back direction. As shown in Figure 6(a), the engaging portion 22 is formed in a roughly C-shape (roughly arc-shaped) when viewed from the front, with the opening facing upward. As shown in Figure 6(b), the engaging portion 22 comprises a flat portion 22a and a curved portion 22b.

[0043] The planar portion 22a is a part that is formed in a planar shape. The planar portion 22a is formed at a lower position than the inner circumferential surface of the engaging portion 22 (the range below the straight line L shown in Figure 6(a)).

[0044] The curved portion 22b is a part formed in a curved shape. The curved portion 22b is formed to extend from the upper end of the flat portion 22a. The curved portion 22b is formed to displace (bend) forward as it moves upward (towards the circumferential end).

[0045] The through-hole 23 shown in Figure 6(a) is a hole that penetrates the engaging portion 22 from front to back. In this embodiment, the through-hole 23 is formed in a substantially circular shape when viewed from the front and is formed in the flat portion 22a. The through-hole 23 is also formed slightly to the right of the left-right center of the engaging portion 22.

[0046] As shown in Figure 7, in the installation process S20, the guide member 20 configured as described above is placed inside the existing pipe 2 from the front end of the existing pipe 2. At this time, the front-to-back position of the guide member 20 is appropriately adjusted so that a groove can be dug to connect with the chamfered portion 11 in the groove forming process S30 described later. In this embodiment, the front-to-back position of the guide member 20 is adjusted so that at least the mounting portion 21 is located behind the chamfered portion 11 (towards the back of the existing pipe 2).

[0047] In the installation process S20, the jack 30 is placed on the mounting portion 21 of the guide member 20. As shown in Figure 7(a), in this embodiment, the jack 30 is placed on the mounting portion 21 such that the operating portion 33, which is operated when retracting the ram 31 of the jack 30, is located behind the through hole 23. The operating portion 32, which is operated when extending the ram 31, is positioned on the inner side of the inner circumferential surface of the engaging portion 22 in a front view.

[0048] In the installation process S20, the operating section 32 of the jack 30 is operated, and the ram 31 is extended. This causes the jack 30 to brace itself within the existing pipe 2, fixing the guide member 20 in place.

[0049] As shown in Figure 4, in this embodiment, after the installation process S20, a groove forming process S30 is performed in which a groove is dug on the lower side of the chamfered portion 11. In the groove forming process S30, the sander 40 and jig 50 shown in Figure 8 are used to form a groove 12 on the lower side of the chamfered portion 11.

[0050] The sander 40 shown in Figure 8(a) is for grinding the inner surface of the existing pipe 2. The sander 40 comprises a main body 41 and a cutter 42. A motor is built into the main body 41. The cutter 42 is formed in a substantially circular shape with its plate surface facing the front-rear direction and is provided at the tip of the main body 41. The cutter 42 is configured to rotate with the front-rear direction as the rotation axis, powered by the motor.

[0051] The jig 50 shown in Figure 8 is used to determine the position of the sander 40 relative to the guide member 20. The jig 50 comprises a fixing member 51, a contact plate 52, and a claw portion 53.

[0052] The fixing member 51 is a member that is fixed to the tip of the main body 41. The rear part of the fixing member 51 is formed to cover the upper part of the cutter 42. The front part of the fixing member 51 is fixed to the main body 41 via a band (not shown).

[0053] The contact plate 52 is a plate-shaped member that can contact the inner circumferential surface of the existing pipe 2. As shown in Figure 8(b), the contact plate 52 is formed in a roughly U-shape when viewed from the front, with an opening at the top. A pair of contact plates 52 are provided, one in front and one behind the cutter 42. The contact plate 52 has an elongated hole 52a that penetrates from front to back and has its longitudinal direction oriented vertically. The contact plate 52 is fixed to the fixing member 51 by inserting bolts (not shown) through holes and elongated holes 52a formed in the fixing member 51.

[0054] The vertical position of the contact plate 52 relative to the fixing member 51 can be adjusted by loosening the bolts. Note that the configuration for adjusting the vertical position of the contact plate 52 is not limited to this embodiment.

[0055] The claw portion 53 is for hooking onto the engaging portion 22 (see Figure 6) of the guide member 20. The claw portion 53 is positioned with its plate surface facing the front-rear direction, and its upper end is formed to be bent forward. The upper end of the claw portion 53 is fixed to the front contact plate 52. In this way, the claw portion 53 is positioned forward of the front contact plate 52 by a width approximately equal to the thickness of the engaging portion 22 of the guide member 20.

[0056] As shown in Figures 9 and 10, in the groove forming process S30, the claw portion 53 of the jig 50 is hooked onto the engaging portion 22 of the guide member 20. The front contact plate 52 also comes into contact with the engaging portion 22 of the guide member 20.

[0057] With the jig 50 engaged with the guide member 20, the motor of the sander 40 is driven, and the inner surface of the existing pipe 2 is ground down by the rotation of the cutter 42. In the groove formation process S30, the sander 40 is moved along the engagement portion 22.

[0058] As described above, in this embodiment, the end face 2a of the existing pipe 2 is formed in a curved shape along the inner wall portion 1a of the manhole 1 (see Figure 2(a)). The end face 2a is formed to bulge forward from the bottom towards the upper and lower middle portions. In this embodiment, as the sander 40 moves along the engaging portion 22 (curved portion 22b), a groove portion 12 is formed so as to slope forward from the bottom towards the upper and lower middle portions of the inner circumferential surface of the existing pipe 2. That is, by using the guide member 20, a groove portion 12 that displaces back and forth in the same way as the end face 2a of the existing pipe 2 can be formed.

[0059] In this way, by forming a groove 12 that is displaced forward from the bottom towards the upper and lower middle portion along the end face 2a of the existing pipe 2, the distance from the end face 2a of the existing pipe 2 to the groove 12 can be kept approximately constant (about 30 mm in this embodiment), regardless of the circumferential position of the groove 12.

[0060] In the groove formation process S30, the inner surface of the existing pipe 2 is machined to a depth where the contact plate 52 shown in Figure 9 contacts the inner surface of the pipe 2. In this way, a groove 12 of a certain depth is formed in the groove formation process S30. In this embodiment, the vertical position of the contact plate 52 can be adjusted by the elongated hole 52a (see Figure 8(b)), so the depth of the groove 12 can be easily changed by adjusting the vertical position.

[0061] In the groove formation process S30, after the formation of the groove 12 is completed, the operating part 33 of the jack 30 shown in Figure 7(a) is operated to retract the ram 31 and release the fixing of the guide member 20. As described above, in the installation process S20, the jack 30 is installed so that the operating part 33 is positioned behind the through hole 23. In the groove formation process S30, the operating part 33 is operated using the through hole 23. For example, a rod-shaped member (not shown) is inserted through the through hole 23 and engaged with the operating part 33, and the operating part 33 is operated via the rod-shaped member. This allows the worker to easily operate the operating part 33 without reaching into the existing pipe 2.

[0062] In the groove formation process S30, after the guide member 20 is released from its fixed position, the guide member 20 and the jack 30 are removed from inside the existing pipe 2 to the outside. This completes the groove formation process S30.

[0063] In this embodiment, the rehabilitated pipe 3 is installed inside the existing pipe 2 after the groove formation process S30. At this time, the invert 1b is appropriately repaired so as to follow the inner circumferential surface of the rehabilitated pipe 3. Subsequently, in this embodiment, as shown in Figure 4, an installation process S40 is performed in which the water-swellable rubber 13 is installed.

[0064] In the installation process S40, the string-shaped water-swellable rubber 13 is inserted into one of the circumferential ends of the groove 12 via the chamfered portion 11 shown in Figure 12. The water-swellable rubber 13 is then pulled out from the other circumferential end of the groove 12. With the ends of the water-swellable rubber 13 bonded together in this state, the water-swellable rubber 13 is wound around the chamfered portion 11 and the groove 12. In addition, multiple (two) water-swellable rubbers 13 are wound around the groove. Thus, in this embodiment, by forming the chamfered portion 11 on the upper part of the inner circumferential surface of the existing pipe 2, the water-swellable rubber 13 can be easily installed even after the rehabilitated pipe 3 has been installed.

[0065] Furthermore, by performing the installation process S40 after the installation of the rehabilitated pipe 3, it is possible to prevent problems with the water-swelling rubber 13. For example, it is possible to prevent the rehabilitated pipe 3 from getting caught in the water-swelling rubber 13 when it is transported into the existing pipe 2, thus preventing water-stopping failure.

[0066] As shown in Figure 4, in this embodiment, after the installation process S40, a winding process S50 is performed in which the wire 15 is wrapped around the existing pipe 2. As shown in Figure 12(a), in the winding process S50, nails 15a are driven in with a hammer or the like around the chamfered portion 11 of the existing pipe 2 on the inner wall 1a of the manhole 1. Multiple nails 15a are driven in along the circumferential direction of the existing pipe 2. In the winding process S50, the wire 15 is wrapped around these nails 15a.

[0067] As shown in Figure 4, in this embodiment, after the wrapping process S50, a repair process S60 is performed to repair the chamfered portion 11. As shown in Figure 3, in the repair process S60, the chamfered portion 11 is filled with repair material 14. In addition, in the repair process S60, the repair material 14 is applied to the inner wall portion 1a of the manhole 1 (around the chamfered portion 11). As a result, the wire 15 (see Figure 12(a)) is covered with repair material 14. Once the repair process S60 is completed, the construction of the watertight structure 10 is finished.

[0068] In this embodiment, by forming the groove 12, the water-swellable rubber 13 can be installed without extensively chipping away at the invert 1b. In addition, in this embodiment, the shape of the groove 12 is formed so as to displace in the front-rear direction along the end face 2a of the existing pipe 2. That is, as the end face 2a displaces forward from the bottom towards the upper and lower middle sections, the groove 12 is also formed so as to displace in the same direction (forward) as the inner surface of the existing pipe 2 from the bottom towards the upper and lower middle sections. This allows the water-swellable rubber 13 to be attached at a generally constant position (an easily accessible position) from the end face 2a of the existing pipe 2. In this way, the effort required to chip away at the invert 1b is reduced, and the deterioration of the ease of attaching the water-swellable rubber 13 is suppressed, thereby improving workability.

[0069] Furthermore, by forming the groove 12 along the end face 2a of the existing pipe 2, the chamfered portion 11 and the groove 12 can be connected without significantly chamfering the end face 2a. More specifically, unlike this embodiment, if a groove 12 is formed that does not follow the end face 2a of the existing pipe 2, for example, a groove 12 that simply follows the circumferential direction of the existing pipe 2 (without displacement in the front-rear direction), as shown by the dashed line in Figure 11, the distance from the circumferential end of the groove 12 to the end face 2a becomes relatively long.

[0070] In contrast, in this embodiment, the groove portion 12 is formed along the shape of the end face 2a, so it is possible to suppress the length of the distance from the circumferential end of the groove portion 12 to the end face 2a. Since the circumferential end of the groove portion 12 is the part that connects to the chamfered portion 11, by suppressing the length of the distance to the end face 2a, the chamfered portion 11 and the groove portion 12 can be connected without significantly chamfering the end face 2a.

[0071] In this embodiment, a groove 12 is formed on the inner surface of the existing pipe 2 in the portion corresponding to the invert 1b, while a relatively easy-to-construct chamfered portion 11 is formed on the remaining portion. This allows for chamfered portions 11 to be formed in the easily chamfered portions (portions that can be chamfered without chipping away at the invert 1b) and grooves 12 to be formed in the difficult-to-chamfer portions (portions that cannot be chamfered without chipping away at the invert 1b), thereby improving workability while ensuring proper watertight sealing. It also reduces the cost required for constructing the watertight structure 10.

[0072] Furthermore, by forming the groove 12 only on a portion of the inner surface of the existing pipe 2 (the part that is difficult to chamfer) rather than the entire circumference, variations in the dimensions of the groove 12 can be suppressed, and the dimensions of the groove 12 can be easily controlled.

[0073] Furthermore, in this embodiment, since it is not necessary to extensively chip away at the invert 1b, vibrations generated during the construction of the watertight structure 10 can be suppressed, and cracks in the existing pipe 2 can be prevented.

[0074] As described above, the water-stopping method according to this embodiment is a water-stopping method for stopping water from entering between an existing pipe 2 whose end is connected to a manhole 1 and a rehabilitation pipe 3 provided inside the existing pipe 2, and comprises a groove forming step S30 in which a groove portion 12 is formed on the inner circumferential surface of the end portion, which is displaced in the extension direction (front-rear direction) of the existing pipe 2 so as to be along the end face 2a of the existing pipe 2, and an attachment step S40 in which a water-swellable rubber 13 (water-stopping material) is attached to the groove portion 12.

[0075] By configuring it in this way, the water-swellable rubber 13 can be attached along the end face 2a of the existing pipe 2, thereby improving workability.

[0076] The process further includes a chamfering step S10 in which the upper part of the inner circumferential surface of the end portion is chamfered to form a chamfered portion 11, in the groove portion forming step S30 in which the groove portion 12 is formed below the chamfered portion 11 so as to be connected to the chamfered portion 11, and in the mounting step S40 in which the water-swellable rubber 13 is attached across the groove portion 12 and the chamfered portion 11.

[0077] By configuring it in this way, not only the groove portion 12 but also the chamfered portion 11, which is relatively easy to construct, can be formed, thereby improving workability.

[0078] Furthermore, the installation process S40 is performed after the rehabilitation pipe 3 has been installed (see Figure 12).

[0079] By configuring it in this way, when the rehabilitated pipe 3 is transported inside the existing pipe 2, the water-swellable rubber 13 will not get caught in the rehabilitated pipe 3, thus preventing malfunctions (such as poor water sealing).

[0080] Furthermore, in the groove formation step S30, the groove 12 is formed in the portion of the manhole 1 corresponding to the invert 1b (see Figure 11).

[0081] By configuring it in this way, the water-swellable rubber 13 can be installed without significantly chipping away at the invert 1b, thus improving workability.

[0082] Furthermore, as described above, the water-stopping structure 10 according to this embodiment is a water-stopping structure 10 for stopping water from entering between an existing pipe 2 whose end is connected to a manhole 1 and a rehabilitation pipe 3 provided inside the existing pipe 2, and comprises a groove 12 formed on the inner circumferential surface of the end so as to be displaced in the extension direction (front-rear direction) of the existing pipe 2 along the end face 2a of the existing pipe 2, and a water-swellable rubber 13 (water-stopping material) attached to the groove 12.

[0083] By configuring it in this way, the water-swellable rubber 13 can be attached along the end face 2a of the existing pipe 2, thereby improving workability.

[0084] Furthermore, the existing pipe 2 is further provided with a chamfered portion 11 formed by chamfering the upper part of the inner circumferential surface, the groove portion 12 is formed below the chamfered portion 11 and connected to the chamfered portion 11, and the water-swellable rubber 13 is attached across the groove portion 12 and the chamfered portion 11.

[0085] By configuring it in this way, not only the groove portion 12 but also the chamfered portion 11, which is relatively easy to construct, can be formed, thereby improving workability.

[0086] Furthermore, multiple water-swellable rubber units 13 can be attached.

[0087] By configuring it in this way, multiple water-swellable rubbers 13 can effectively stop water from entering between the existing pipe 2 and the rehabilitated pipe 3.

[0088] Furthermore, the water-swellable rubber 13 is composed of a water-swellable material that swells by absorbing water.

[0089] With this configuration, when water flows between the existing pipe 2 and the rehabilitated pipe 3, the water-swelling material swells, thereby effectively stopping water flow between the existing pipe 2 and the rehabilitated pipe 3.

[0090] The device further comprises a repair material 14 for repairing the chamfered portion 11, and a wire 15 (reinforcement member) that is fixed to at least one of the existing pipe 2 or the manhole 1 and covered by the repair material 14.

[0091] By configuring it in this way, the repair material 14 can be firmly fixed, and consequently, the watertight structure 10 can be firmly formed.

[0092] Furthermore, the groove 12 is formed in the portion of the manhole 1 that corresponds to the invert 1b.

[0093] This configuration allows for the installation of waterproofing material without extensively chipping away at invert 1b, thereby improving workability.

[0094] Furthermore, the water-swellable rubber 13 according to this embodiment is one embodiment of the water-stopping material according to the present invention. Furthermore, the wire 15 according to this embodiment is one form of the reinforcing member according to the present invention, and by reinforcing it in advance in areas with loose ground or earthquake-prone zones, it is possible to create a structure that is more resistant to disasters. In addition to wire 15 and metal, resin or fibrous materials may also be used.

[0095] Although embodiments of the present invention have been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention as described in the claims.

[0096] For example, the water-stopping structure 10 in this embodiment is designed to stop water flow between the existing pipe 2 and the rehabilitated pipe 3 that constitute the sewer system. However, the waterway to which the water-stopping structure 10 is applied is not limited to sewers, but may also be other waterways (e.g., water supply systems).

[0097] In this embodiment, the groove 12 is formed on an existing pipe 2 whose end face 2a is approximately circular in plan view. However, it is also possible to form the groove 12 on an existing pipe having an end face shape different from that of this embodiment.

[0098] In this embodiment, the chamfered portion 11 is formed before the groove portion 12 is formed, but the order in which the chamfered portion 11 and the groove portion 12 are formed is not particularly limited. That is, when constructing the watertight structure 10, it is also possible to form the groove portion 12 before forming the chamfered portion 11.

[0099] In this embodiment, the groove 12 is formed in the portion corresponding to the invert 1b (in the same height range as the invert 1b), but this is just an example, and the relationship between the invert 1b and the groove 12 can be changed as appropriate. For example, the groove 12 may be formed to a position higher than the portion corresponding to the invert 1b. In this way, by forming the groove 12 at least in the portion corresponding to the invert 1b, the watertight structure 10 can be constructed without extensively chipping away at the invert 1b, thereby improving constructability.

[0100] In this embodiment, a through hole 23 is formed in the lower part of the guide member 20 used to form the groove 12 (see Figure 6(a)), but this is just one example, and the position of the through hole 23 can be appropriately changed depending on the position of the operating parts 32 and 33 of the jack 30. Depending on the type of jack 30, it is also possible to use a guide member 20 in which no through hole 23 is formed.

[0101] In this embodiment, the water-swellable rubber 13 is attached after the rehabilitation pipe 3 is installed, but the timing of attaching the water-swellable rubber 13 may be before the rehabilitation pipe 3 is installed. In this case, if the water-swellable rubber 13 is attached before the rehabilitation pipe 3 is installed, the rehabilitation pipe 3 will not get in the way, so it is possible to form a groove instead of a chamfered portion 11 on the upper part of the existing pipe 2.

[0102] In this embodiment, the gap between the existing pipe 2 and the rehabilitated pipe 3 is sealed with water-swellable rubber 13. However, the member (water-sealing material) that seals the gap between the existing pipe 2 and the rehabilitated pipe 3 is not limited to water-swellable rubber 13. For example, other water-swellable materials (other than rubber) that swell when they absorb water can be used as the water-sealing member. Furthermore, annular members or the like made of a material different from the water-swellable material can also be used as the water-sealing material.

[0103] In this embodiment, the repair material 14 is reinforced with wire 15, but it is also possible to reinforce the repair material 14 more firmly with a different material than wire 15. [Explanation of Symbols]

[0104] 1 Manhole 2 Existing pipes 3 Rehabilitation pipe 10. Water-stopping structure 11 Chamfered section 12 grooves 13 Water-swellable rubber

Claims

1. A method for stopping water flow between an existing pipe whose end is connected to a manhole and a rehabilitation pipe installed inside the existing pipe, A groove forming step is to form a groove on the inner circumferential surface of the end portion that is displaced in the direction of extension of the existing pipe so as to be along the end surface of the existing pipe, Installation step of attaching a water-stopping material to the groove, Equipped with, Methods for stopping water flow.

2. The method further comprises a chamfering step of chamfering the upper part of the inner circumferential surface of the end to form a chamfered portion, In the groove formation step, A groove is formed on the lower side of the chamfered portion so as to connect with the chamfered portion. In the aforementioned mounting process, The water-stopping material is installed across the groove and the chamfered portion. The method for stopping water flow according to claim 1.

3. The aforementioned mounting process is, This is performed after the rehabilitation pipe has been installed in the existing pipe. The water-stopping method according to claim 2.

4. In the groove formation step, The groove is formed in the portion of the manhole corresponding to the invert formed therein. A method for stopping water flow according to any one of claims 1 to 3.

5. A watertight structure for sealing off water between an existing pipe whose end is connected to a manhole and a rehabilitation pipe installed inside the existing pipe, A groove is formed on the inner circumferential surface of the end portion so as to be displaced along the end face of the existing pipe in the direction of extension of the existing pipe, A water-stopping material attached to the groove, Equipped with, Watertight structure.

6. The existing pipe further comprises a chamfered portion formed by chamfering the upper part of the inner circumferential surface, The groove portion is Below the chamfered portion, a portion is formed to connect with the chamfered portion. The aforementioned waterproofing material is Attached across the groove and the chamfered portion, The water-stopping structure according to claim 5.

7. The aforementioned waterproofing material is Multiple units can be installed. The water-stopping structure according to claim 6.

8. The aforementioned waterproofing material is It is composed of a water-swelling material that swells when it absorbs water. The water-stopping structure according to claim 6 or claim 7.

9. A repair material for repairing the chamfered portion, A reinforcing member fixed to at least one of the existing pipe or the manhole and covered with the repair material, It further possesses, The water-stopping structure according to claim 8.

10. The groove portion is Formed in the portion corresponding to the invert formed in the manhole, A water-stopping structure according to any one of claims 5 to 7.

Images