End cover of renovation pipe and renovation pipe insertion jig

Abstract

To provide an end cover of a renovation pipe and a renovation pipe insertion jig that facilitate the work of pulling a renovation pipe from a manhole into an existing pipe.SOLUTION: An end cover 5 of a renovation pipe of the present invention has a hollow body that is inserted through an opening to cover an end 1a of the renovation pipe 1 to be inserted into an existing pipe buried underground, an insertion port 20 is formed in an end 5b of the body through which a cable member Y that connects to the end 1a of the renovation pipe 1 and pulls the renovation pipe 1 into the existing pipe is inserted, the body has an upper wall part 12 that faces a top wall side of the existing pipe, and the insertion port 20 is formed at a position eccentric to the upper wall part 12 side relative to the opening 21 when viewing the body in a direction of insertion of the end 1a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] A known method for rehabilitating aging existing pipes, such as sewer pipes, involves crushing a thermoplastic resin pipe, folding it into a pipe liner, pulling it into the existing pipe, and then heating it to restore it to a circular shape, lining the inside of the existing pipe (see, 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, etc., a guide wire (strut member) is fixed to the tip of the pipe liner and stretched between multiple manholes connected to the existing pipe to be rehabilitated. The pipe liner is then 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 insertion 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 inside the existing pipe.

[0005] A guide wire outlet is formed approximately in 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 penetrate the distal end cover, allowing the wire to move widely across both ends of the fastener (Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-283453 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-291216 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 line through the manhole. However, because the pipe liner was wound around Drum D in a folded state into a so-called omega (Ω) shape, it still retained a strong tendency to curl even after being softened by steam heat. Such pipe liners are pulled into the manhole and existing pipe by using a winch or the like to pull the wire with a considerable force, forcibly stretching it against the tendency to 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 tends to bend, 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 a tip cover and a rehabilitation pipe insertion jig that make it easy to pull a rehabilitation pipe from a manhole into an existing pipe. [Means for solving the problem]

[0010] The end cover of a rehabilitation pipe of the present invention has a hollow body portion that is inserted through an opening to cover the end of a rehabilitation pipe to be inserted into an existing pipe buried underground, and an insertion hole for inserting a wire member into the end of the rehabilitation pipe is formed at the tip of the body portion, and the body portion has an upper wall portion that faces the top wall of the existing pipe, and the insertion hole is formed at a position eccentric to the upper wall portion relative to the opening when viewing the body portion in the direction of insertion of the end portion. With this configuration, when the rehabilitation pipe is pulled into the existing pipe, the tip 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 rehabilitating 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 distal end cover of the rehabilitating pipe of the present invention may form a concave surface that curves in an arch shape from the distal end of the body portion toward the proximal end. With this configuration, the tip cover fits the guide roller and the angle can be easily changed.

[0013] The rehabilitation pipe insertion jig of the present invention comprises a tip cover of the rehabilitation pipe 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. [Effects 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 explanation of the drawings]

[0015] [Figure 1] 1 is a perspective view showing an example of a rehabilitating pipe to which the present invention is applied. [Figure 2] 1 is a plan view showing a rehabilitation pipe insertion jig according to an embodiment of the present invention. FIG. [Figure 3]1 is a left side view showing a part of a rehabilitation pipe insertion jig according to an embodiment of the present invention, excluding the tip cover. FIG. [Figure 4] 1A and 1B are diagrams showing a rehabilitating pipe end cover according to one embodiment of the present invention, in which FIG. 1A is a plan view of the rehabilitating pipe end cover, and FIG. 1B is a right side view of the rehabilitating pipe end cover. [Figure 5] 1A and 1B are diagrams showing a rehabilitating pipe end cover according to one embodiment of the present invention, in which FIG. 1A is a front view of the rehabilitating pipe end cover, and FIG. 1B is a rear view of the rehabilitating pipe end cover. [Figure 6] FIG. 10 is a schematic diagram showing a method for pulling a rehabilitation pipe into an existing pipe. [Figure 7] FIG. 10 is a partially enlarged schematic diagram showing a method for pulling a rehabilitation pipe into an existing pipe. [Figure 8] FIG. 10 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. 10 is a plan view showing a rehabilitation pipe insertion jig according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[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 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 "flattened liner 1") is made of thermoplastic resin and has the ability to become cylindrical when heated to a predetermined temperature (e.g., 80°C) without the application of external forces such as pressure. The flat liner 1 is made of hard vinyl 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 fixture 3 has a fixing rod 6 that passes through the flat liner 1, and a fixing plate 7 that is arranged to extend in a direction approximately perpendicular to the fixing rod 6 and through which one or more fixing rods 6 are inserted.

[0020] The fixing rod 6 is suitably composed of, for example, a bolt that is placed through the multiple overlapping pipe walls of the flat liner 1, and nuts that are fastened to both ends of the bolt while it is penetrating the pipe wall of the rehabilitating pipe 1.

[0021] 3, the fixed plate 7 is a plate member formed in the shape of a long, narrow rectangle or the like and has at least one fixed rod insertion hole 7a and a locking rod insertion hole 7b, spaced apart, for inserting the locking rod 8. In this embodiment, two fixed rods 6 are used, and so 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 with a bolt and nut, etc. The locking rod 8 is designed to be able to fix the wire Y in a state where it is inserted through the fixing plate 7 without passing through the flat liner 1.

[0023] 4(a) and 4(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 a generally flat outer surface 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] In plan view, 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, and then narrows toward the tip, and is hollow and formed into an approximately trapezoidal shape overall. The upper wall portion 12 is formed in a substantially flat plate shape that extends 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 distance (several centimeters to approximately 50 mm) from the base end portion 5a, and then is inclined toward the upper wall portion 12 in the distal end direction, and is formed in a curved plate shape. The upper wall portion 12 and the lower wall portion 14 are provided so that their shapes are substantially the same in plan view.

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

[0027] Furthermore, the upper wall portion 12 is formed on an approximately flat surface, but the lower wall portion 14 is bent and inclined toward the upper wall portion 12 on the base end side toward the tip, so that the tip cover 5 as a whole has a shape that narrows toward the tip. The tip side 5b of the body, which has an upper wall portion 12, side wall portions 13, 13 and a lower wall portion 14, is closed except for the 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 wall portions 13, 13 and lower wall portion 14.

[0028] Based on the above configuration, the tip cover 5 has a base end portion 5a formed in a flat, rectangular tube shape of approximately constant width, and a tip end portion 5b that is flat and has an approximately pyramidal or tapered shape whose width and height gradually decrease toward the tip.

[0029] The distal end cover 5 has an insertion port 20 for the wire Y open at the distal end 5b, and an internal space penetrating from the base end 5a to the distal end 5b provides a storage section S. The lower wall 14 is inclined toward the upper wall 12, so that the distal end 5b is gradually brought closer to the upper wall 12. Therefore, the insertion port 20 is formed closer to the upper wall 12 than the opening 21 on the proximal 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. Before inserting the flat liner 1 into the existing pipe X, the inside of the existing pipe X is cleaned and any protruding objects are removed. The drum D around which the flat liner 1 is wound is preheated in a steam heating tent (not shown) installed in the loading platform 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 the 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 pulling 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 of the drum D, and a through-hole is formed in the end 1a of the flat liner 1 using a drill or other drilling tool, as shown in Figures 2 and 3. Then, the fixing plate 7 is sandwiched between the flat liner 1, and the bolts of the fixing rod 6 are inserted into the through-hole and the insertion hole 7a of the fixing plate 7 and fastened with nuts. Furthermore, a locking rod 8 is inserted between the fixing plates 7, 7 on the tip side of the fixing plates 7 and fastened with a nut.

[0035] Next, with the wire Y attached to the locking 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. This completes the preparation for inserting the flat liner 1 into the insertion-side manhole M1.

[0036] As shown in Figure 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 bottom 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 cools, and even though the flexibility allows it to be pulled out of the drum D, it still retains the strong curl that was created when it was wrapped around the drum D.

[0037] Therefore, the tip of the flat liner 1 curls and tends to point toward the lower peripheral wall on which the drum D is installed in the circumferential direction of the insertion-side manhole M1. However, as shown in FIG. 7, a lead-in guide pipe G1 is arranged on the peripheral wall of the manhole M1 below where 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 it is possible to effectively prevent the upper wall portion 12 of the tip cover 5 from colliding with the guide roller G2 and obstructing its entry.

[0039] When the tip cover 5 reaches the guide roller G2, the flat liner 1 reaches the approximate bottom 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, and the stretched state in the vertical direction is maintained relatively stably.

[0040] However, when the flat liner 1 enters the corner between the insertion manhole M1 and the existing pipe X, the tension that had been 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 suddenly try to curl again. 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 elastic recovery caused by the curling force.

[0041] However, the tip 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 around a little 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. Furthermore, 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 around a little 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] The flat liner 1 is pulled below the pull-out manhole M2, and once the flat liner 1 has been 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 in place 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 up to its 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 manner described above, compressed air is sent into the rehabilitated pipe to pressurize and expand it, causing the rehabilitated pipe to adhere tightly to the inner surface of the existing pipe X, and at the same time, the rehabilitated pipe is cooled and solidified, thereby completing the rehabilitating work of the inner surface of the existing pipe X.

[0046] In this way, when the rehabilitation pipe insertion jig of the present invention is used, the effect is achieved that the work of laying the flat liner 1 can be carried out efficiently and smoothly while preventing damage to the existing pipe X.

[0047] In the above embodiment, the upper wall portion 12 is formed in a flat plate shape, but the upper wall portion 12 may have an arched 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-side manhole M1 into the existing pipe X.

[0048] Furthermore, the shape of the tip cover 5 is not limited to the shape 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. Furthermore, 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, as long as the method involves pulling the rehabilitation pipe 1 into the existing pipe X and rehabilitating it. Furthermore, as shown in Figure 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 may be used between the locking rod 8 and the wire Y. [Explanation of symbols]

[0049] 1 Flat liner, rehabilitation 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 (strand member)

Claims

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

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 the 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 rehabilitating pipe end cover according to any one of claims 1 to 3; A rehabilitation pipe insertion jig equipped with a fixture that is fixed to the end of the rehabilitation pipe and connects a cable member that pulls the rehabilitation pipe into the existing pipe.

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