Rehabilitation pipe end cover and rehabilitation pipe insertion jig

Abstract

The present invention provides a rehabilitation pipe end cover and a rehabilitation pipe insertion jig that facilitate the work of pulling a rehabilitation pipe from a manhole into an existing pipe. [Solution] The end cover 5 of the rehabilitation pipe of the present invention has a hollow body that covers the end 1a of the rehabilitation pipe 1 to be inserted into an existing pipe buried underground by inserting it through an opening, and an insertion hole 20 is formed in the end 5b of the body through which a cable member Y that connects to the end 1a of the rehabilitation pipe 1 and pulls the rehabilitation pipe 1 into the existing pipe is inserted. The body has an upper wall 12 that faces the top wall of the existing pipe, and the insertion hole 20 is formed at a position eccentric to the upper wall 12 side with respect to the opening 21 when the body is viewed in the direction of insertion of the end 1a.

Description

[Technical field]

[0001] The present invention relates to an end cover for a rehabilitation pipe and a rehabilitation pipe insertion jig. [Background technology]

[0002] As a method for rehabilitating aged existing pipes such as sewer pipes, a method is known in which a thermoplastic resin pipe is crushed and folded into a pipe liner, which is then pulled into the existing pipe and heated to restore it to a circular shape, lining the inside of the existing pipe (for example, Patent Documents 1 and 2 below). One such "thermoplastic resin pipe rehabilitation method" is known as the "Omega Liner Method."

[0003] In the Omega Liner method described in Patent Documents 1 and 2, a guide wire ( cable A wire (strand member) is fixed to the tip of the pipe liner, and the pipe liner is pulled into the existing pipe by using a winch or similar device to pull the wire from the manhole side where it is to be pulled.

[0004] The wire is attached to the tip of the pipe liner using fasteners such as bolts and nuts. Furthermore, a cover is provided at the end of the pipe liner to prevent the fasteners from directly contacting the inner wall of the existing pipe and impeding the pulling-in or damaging the inner wall of the existing pipe when the guide wire is wound up to introduce the pipe liner from one side to the other side of the existing pipe.

[0005] A guide wire outlet is formed approximately at the center of the distal end surface of the distal end cover of Patent Document 1. The distal end cover of Patent Document 2 is formed in a roughly rectangular tube shape, and both ends of an inner core formed in a similar shape to the distal end cover are completely open and penetrated, allowing the wire to move widely across both ends of the fastener (Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2002-283453 A [Patent Document 2] JP 2003-291216 A Summary of the Invention [Problem to be solved by the invention]

[0007] The pipe liner is softened with steam heat before being inserted into the manhole so that it can be pulled into the existing pipe from the manhole. However, since the pipe liner was wound around Drum D in a folded state in a so-called Ω (omega) shape, it still had a strong tendency to curl even after being softened by steam heat. Such pipe liners are pulled into manholes and existing pipes by pulling the wire with a considerable force using a winch or the like, forcibly stretching it against its curl.

[0008] Therefore, when the wire outlet from the tip cover comes out from the center of the tip surface of the tip cover, as in the invention of Patent Document 1, there was a problem that the tip cover was likely to get caught after the guide wire passed through the retraction guide roller installed between the manhole and the existing pipe, hindering the retraction work.

[0009] Furthermore, in both Patent Documents 1 and 2, when the tip of the pipe liner changes angle from the manhole and begins to enter the existing pipe, the tip becomes prone to bending, the force resisting the curl weakens, and the curl reappears, causing the tip of the pipe liner, including the tip cover, to become unruly and difficult to handle. Therefore, the present invention provides an end cover and a rehabilitation pipe insertion tool that make it easy to pull the rehabilitation pipe from a manhole into an existing pipe. [Means for solving the problem]

[0010] The end cover of the rehabilitation pipe of the present invention has a hollow body that is inserted from an opening to cover the end of the rehabilitation pipe to be inserted into an existing pipe buried underground, and the end of the rehabilitation pipe is cableAn insertion hole for inserting a strip member is formed at the tip of the body, the body has an upper wall portion that faces the top wall side of the existing pipe, and the insertion hole is formed at a position eccentric to the upper wall portion side relative to the opening when the body is viewed in the direction of insertion of the end portion. With this configuration, when the rehabilitation pipe is pulled into the existing pipe, the end cover is less likely to come into contact with the existing pipe.

[0011] The outer surface of the upper wall portion of the end cover of the rehabilitation pipe of the present invention may be formed in a flat plate shape. With this configuration, when the rehabilitation pipe is pulled into the existing pipe, the end cover is less likely to come into contact with the existing pipe.

[0012] At least a portion of the outer surface of the upper wall portion of the end cover of the rehabilitation pipe of the present invention may form a concave surface that curves in an arch shape from the tip end of the body portion toward the base end. With this configuration, the tip cover fits closely to the guide roller, making it easy to change the angle.

[0013] The rehabilitation pipe insertion jig of the present invention comprises a rehabilitation pipe end cover described in any one of the above, and a fixing device that is fixed to the end of the rehabilitation pipe and connects a cable member that pulls the rehabilitation pipe into the existing pipe. Effect of the Invention

[0014] The present invention has the effect of facilitating the work of pulling a rehabilitation pipe from a manhole into an existing pipe. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing an example of a rehabilitating pipe to which the present invention is applied. [Diagram 2] 1 is a plan view showing a rehabilitation pipe insertion jig according to an embodiment of the present invention. FIG. [Diagram 3] 1 is a left side view showing a part of a rehabilitation pipe insertion jig other than the tip cover according to an embodiment of the present invention. FIG. [Figure 4]1A and 1B are diagrams showing an end cover of a rehabilitating pipe according to one embodiment of the present invention, in which (a) is a plan view of the end cover of the rehabilitating pipe, and (b) is a right side view of the end cover of the rehabilitating pipe. [Diagram 5] 1A and 1B are diagrams showing an end cover of a rehabilitating pipe according to one embodiment of the present invention, in which FIG. 1A is a front view of the end cover of a rehabilitating pipe, and FIG. [Figure 6] FIG. 4 is a schematic diagram showing a method of pulling a rehabilitation pipe into an existing pipe. [Figure 7] FIG. 13 is a schematic diagram showing, in enlarged form, a method for pulling a rehabilitation pipe into an existing pipe. [Figure 8] FIG. 11 is a left side view showing another example of a tip cover of a rehabilitation pipe according to an embodiment of the present invention. [Figure 9] FIG. 11 is a plan view showing a rehabilitation pipe insertion jig according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the dimensions of each part in the drawings used in the following description are not necessarily the same as the actual dimensions and can be changed as appropriate.

[0017] First, a rehabilitating pipe to which the rehabilitating pipe end cover and the rehabilitating pipe insertion jig of the present invention are applied will be described. As shown in FIG. 1, a rehabilitating pipe 1 to which the present invention is applied is folded along the longitudinal direction so that the pipe width is reduced to about half, and formed so that the area of ​​the pipe end face is reduced. The folded rehabilitation pipe 1 (hereinafter referred to as the "flat liner 1") is made of thermoplastic resin and has the ability to become cylindrical when heated to a specified temperature (e.g., 80°C) without the application of external forces such as pressure. The flat liner 1 is made of hard polyvinyl chloride, high density polyethylene or the like.

[0018] As shown in Figure 2, the rehabilitation pipe insertion jig 2 has a fixing device 3 attached to the end 1a of the flat liner 1, a locking rod 8 that connects the fixing device 3 to a cable member Y such as a wire, and a tip cover 5 that accommodates the fixing device 3 and the end 1a of the flat liner 1.

[0019] The fixing device 3 has a fixing rod 6 which penetrates the flat liner 1, and a fixing plate 7 which is arranged to extend in a direction substantially perpendicular to the fixing rod 6 and through which one or more fixing rods 6 are inserted.

[0020] The fixing rod 6 is suitably configured, for example, by a bolt disposed penetrating the multiple overlapping pipe walls of the flat liner 1 and nuts secured to both ends of the bolt while penetrating the pipe wall of the rehabilitating pipe 1.

[0021] 3, the fixed plate 7 is a plate member having a predetermined thickness and formed in a shape such as an elongated rectangle, and is formed with at least one fixed rod insertion hole 7a and a locking rod insertion hole 7b for inserting the locking rod 8 at intervals. In this embodiment, since two fixed rods 6 are used, a total of three insertion holes 7a for inserting the two fixed rods 6 and one insertion hole 7b for inserting one locking rod 8 are formed in the fixed plate 7. The number of insertion holes 7a and 7b is determined by the dimensions of the tip cover 5, etc., and is not particularly limited.

[0022] 2 and 3, the locking rod 8 can be suitably configured by a bolt and a nut, etc. The locking rod 8 is capable of fixing the wire Y in a state where it is inserted through the fixing plate 7 without penetrating the flat liner 1.

[0023] 4(a) and (b), the end cover 5 of the rehabilitation pipe (hereinafter simply referred to as the "end cover") is surrounded by an upper wall portion 12 having an outer surface formed in a generally flat plate shape facing the top wall surface X1 of the existing pipe X, side walls 13, 13, and a lower wall portion 14 facing the bottom wall surface X2 of the existing pipe X. The upper wall portion 12, the side walls 13, 13, and the lower wall portion 14 form a body portion that circumferentially surrounds the end portion 1a of the flat liner 1.

[0024] The upper wall portion 12 is formed with a constant width of a predetermined dimension (several centimeters to approximately 50 mm) on the base end portion 5a side of the tip cover 5 in a plan view, and then narrows toward the tip, being hollow and roughly trapezoidal overall. The upper wall portion 12 is formed in a substantially flat plate shape extending on one plane.

[0025] The lower wall portion 14 is formed in the same shape as the upper wall portion 12 in a plan view. In a side view, the lower wall portion 14 extends parallel to the upper wall portion 12 for a predetermined dimension (several centimeters to about 50 mm) from the base end portion 5a, and then is inclined toward the upper wall portion 12 in the tip direction, and is formed in a bent plate shape. The upper wall portion 12 and the lower wall portion 14 are provided so as to have substantially the same shape in a plan view.

[0026] 5(a) and (b), the side wall portion 13 is provided along both side edges of the upper wall portion 12 and the lower wall portion 14 in a plan view, in a direction generally perpendicular to the upper and lower side wall portions 12, 14, and closes both side edges of the upper and lower side wall portions 12, 14. The side wall portion 13 does not have to be formed flat, and may be curved outward. The rise dimension of the side wall portion 13 on the base end side is smaller than the maximum width dimension of the upper and lower side walls 12, 14, so that the entire tip cover 5 is formed in a flat shape with a small distance between the upper and lower side walls 12, 14.

[0027] In addition, the upper wall portion 12 is formed on approximately one plane, but the lower wall portion 14 is bent and inclined toward the upper wall portion 12 toward the tip at the base end, so that the tip cover 5 as a whole has a shape that tapers toward the tip. The tip side 5b of the body, which has an upper wall portion 12, side walls 13, 13 and a lower wall portion 14, is closed leaving an insertion opening 20, and the opening 21 on the base side 5a is not closed, exposing the end faces of the upper wall portion 12, side walls 13, 13 and lower wall portion 14.

[0028] With the above-described configuration, the tip cover 5 has a base end 5a formed in a flat, rectangular tube shape of approximately constant width, and a flat, roughly pyramidal or tapered tip end 5b whose width and height gradually decrease toward the tip.

[0029] Further, the tip cover 5 has an insertion port 20 for the wire Y open at the tip portion 5b, and an internal space penetrating from the base end portion 5a to the tip portion 5b provides a storage portion S. Since the lower wall portion 14 is inclined toward the upper wall portion 12, the tip portion 5b is gradually brought closer to the upper wall portion 12, and therefore the insertion port 20 is formed closer to the upper wall portion 12 than the opening 21 on the base end side when viewed in the penetrating direction.

[0030] The receiving portion S of the tip cover 5 is adapted to receive the fixing device 3 and the end portion 1 a of the flat liner 1 . The tip cover 5 is formed from a steel plate or the like having a predetermined thickness that ensures rigidity.

[0031] Next, a method for rehabilitating an existing pipe using the present invention will be described with reference to Figs. Prior to inserting the flat liner 1 into the existing pipe X, the inside of the existing pipe X is cleaned and protruding objects are removed in advance. The drum D around which the flat liner 1 is wound is preheated in a steam heating tent (not shown) installed on the bed of a vehicle or the like, to give the flat liner 1 flexibility that allows it to be pulled out from the drum D.

[0032] As shown in FIG. 6, the flat liner 1 wound around a drum D is placed on the ground near the insertion side manhole M1. A winch W is placed on the ground near the pull-out manhole M2. In the pull-out manhole M2, a plurality of pulleys K for smoothly pulling up the wire and a support rod B for fixing them are installed so as to be connected to a device for paying out the winch W.

[0033] A guide pipe G1 for smoothly guiding the flat liner 1 downward is installed on the peripheral wall of the insertion manhole M1 below the circumferential position where the drum D is installed. In addition, a drawing guide roller G2 for guiding the wire Y that pulls the flat liner 1 is installed below the guide pipe G1. The tip of the wire Y extending from the winch W is led from the lower end of the extraction side manhole M2 through the existing pipe X to the lower end of the insertion side manhole M1.

[0034] Before starting insertion into the insertion side manhole M1, the flat liner 1 is pulled out from the drum D, and a through hole is formed in the end 1a of the flat liner 1 using a hole making tool such as a drill, as shown in Figures 2 and 3. The fixing plate 7 is then sandwiched between the flat liner 1, and the bolt of the fixing rod 6 is inserted into the through hole and the insertion hole 7a of the fixing plate 7 and fastened with a nut. A locking rod 8 is further inserted between the fixing plates 7, 7 on the tip side of the fixing plate 7, and fixed with a nut.

[0035] Next, with the wire Y attached to the engaging rod 8 protruding from the insertion opening 20, the end 1a of the flat liner 1 with the fixture 3 attached is placed in the storage section S of the tip cover 5. The tip cover 5 is attached to the tip of the flat liner 1 so that the upper wall section 12 faces the side of the flat liner 1 that is about to curl, i.e., the inner circumferential surface when it is wound around the drum D. Then, the tip cover 5 is firmly fixed to the tip of the flat liner 1 with adhesive tape or the like to prevent the tip cover 5 from moving toward the wire Y. With the above steps, preparation for inserting the flat liner 1 into the insertion-side manhole M1 is completed.

[0036] As shown in Fig. 6, when inserting the flat liner 1 into the existing pipe X through the insertion manhole M1, the drum D is rotated and the flat liner 1 is first inserted toward the lower end of the manhole M1, i.e., the position where it intersects with the existing pipe X. At this time, the flat liner 1 has been given flexibility by preheating, but once it leaves the steam heating tent it will cool, and even though it can be pulled out of the drum D due to the flexibility given to it, it still retains the strong curling tendency from when it was wound around the drum D.

[0037] Therefore, the tip of the flat liner 1 tends to curl toward the lower peripheral wall on which the drum D is disposed in the circumferential direction of the insertion manhole M1. However, as shown in FIG. 7, a guide pipe G1 is arranged on the peripheral wall of the manhole M1 below which the drum D is installed, so that the flat liner 1 is guided into the manhole M1.

[0038] When the tip cover 5 at the tip of the flat liner 1 approaches the guide roller G2, the upper wall portion 12 of the tip cover 5 is formed flat and the insertion opening 20 of the tip cover 5 is eccentric toward the upper wall portion 12, so that it is possible to effectively prevent the upper wall portion 12 of the tip cover 5 from colliding with the guide roller G2 and hindering entry.

[0039] When the tip cover 5 reaches the guide roller G2, the flat liner 1 reaches the approximate bottom end of the manhole and is stretched out for several meters. At this time, tension is applied to the flat liner 1 in the vertical direction, so that the flat liner 1 is kept relatively stably stretched in the vertical direction.

[0040] However, when the flat liner 1 enters the corner between the insertion manhole M1 and the existing pipe X, the tension applied vertically inside the manhole is released, and the flat liner 1 changes direction in the direction of the curl, causing the flat liner 1 to try to curl again in one go. At this time, the tip of the flat liner 1, including the highly rigid tip cover 5, may become unruly due to the release of tension and the elastic return caused by the curling force.

[0041] However, the end cover 5 has an insertion opening 20 through which the wire Y is inserted that is eccentric toward the upper wall portion 12 and the upper wall portion 12 is formed flat, i.e., the upper wall portion 12 does not protrude toward the top wall of the existing pipe X.

[0042] Therefore, even if the tip of the flat liner 1 moves wildly when it enters the existing pipe X, it is possible to effectively prevent the upper wall portion 12 from colliding with the top wall surface X1 of the existing pipe X and damaging the inner wall of the existing pipe X. In addition, since the insertion opening 20 of the tip cover 5 is eccentric toward the upper wall portion 12, it is possible to effectively prevent the tip of the flat liner 1 from moving wildly when it enters the existing pipe X.

[0043] When the flat liner 1 is stretched to a certain extent (for example, several meters) into the existing pipe X, horizontal tension is applied to the flat liner 1, so that the flat liner 1 can be stretched continuously and stably.

[0044] After the flat liner 1 is pulled under the pull-out manhole M2 and installed over the entire length of the existing pipe X connecting the manholes M1 and M2, a steam pressurizing device is attached to the tip of the flat liner 1 instead of the rehabilitation pipe insertion jig 1, and steam is continuously supplied into the flat liner 1. This heats the flat liner 1 from the inside to a shape recovery temperature, causing it to recover to almost its original cylindrical shape.

[0045] After the flat liner 1 is formed into a cylindrical rehabilitated pipe in the above manner, compressed air is sent into the rehabilitated pipe to pressurize and expand it, and the rehabilitated pipe is brought into close contact with the inner surface of the existing pipe X, and is simultaneously cooled and solidified, thereby completing the rehabilitating work of the inner surface of the existing pipe X.

[0046] In this way, by using the rehabilitation pipe insertion jig of the present invention, it is possible to prevent damage to the existing pipe X during the installation work of the flat liner 1, and to perform the work efficiently and smoothly.

[0047] In the above embodiment, the upper wall portion 12 is flat, but the upper wall portion 12 may have an arch-shaped concave surface 12R that can easily fit along the guide roller G2 to some extent, as shown in Fig. 8. Providing the upper wall portion 12 of the tip cover 5 with the concave surface 12R that can easily fit along the guide roller G2 has the effect of making it easier to pull the flat liner 1 from the insertion manhole M1 into the existing pipe X.

[0048] Furthermore, the shape of the tip cover 5 is not limited to that of the above embodiment as long as the outer surface of the upper wall portion 12 is approximately flat and the insertion opening 20 is offset toward the upper wall portion 12 with respect to the opening 21 of the base end portion 5a. In addition, the rehabilitation pipe insertion jig and rehabilitation pipe end cover 5 of the present invention may be applicable to a method other than the flat liner 1 shown in the above embodiment, so long as the method involves pulling the rehabilitation pipe 1 into the existing pipe X and rehabilitating it. Furthermore, as shown in FIG. 9, when connecting the flat liner 1 housed in the tip cover 5 to the wire Y, a connector 4 having a ring portion 10 and a fastener 11 between the locking rod 8 and the wire Y may be used. [Explanation of symbols]

[0049] 1 Flat liner, rehabilitated pipe 2. Rehabilitation pipe insertion jig 3 Fixtures 5 Tip cover 5a Proximal end 5b Tip 6 Fixed rod 7 Fixed plate 8 Locking rod 12 Upper wall (body) 13 Side wall (body) 14 Lower wall (body) 20 Insertion port 21 Opening B Support rod K pulley S Storage section X Existing pipe Y wire ( cable Strip members)

Claims

1. The pipe has a hollow body that is inserted through an opening to cover an end of a rehabilitation pipe to be inserted into an existing pipe buried underground, An insertion port is formed at the tip of the body for inserting a cable member that is connected to an end of the rehabilitating pipe and pulls the rehabilitating pipe into the existing pipe, The body portion has an upper wall portion facing a top wall side of the existing pipe, The insertion hole is formed at a position eccentric to the upper wall portion relative to the opening when viewed in the direction of insertion of the end portion of the body of the rehabilitating pipe.

2. 2. The end cover of claim 1, wherein the outer surface of the upper wall portion is formed in a flat plate shape.

3. 2. The end cover for a rehabilitating pipe according to claim 1, wherein at least a portion of an outer surface of the upper wall portion forms a concave surface that curves in an arch shape from the tip end of the body portion toward the base end thereof.

4. A tip cover of a rehabilitation pipe according to any one of claims 1 to 3; A rehabilitation pipe insertion jig having a fixing device which is fixed to the end of the rehabilitation pipe and connects a cable member which pulls the rehabilitation pipe into the existing pipe.

Images