JPS6044687A - Branch section structure for repair - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a repair branch structure used when repairing cast iron pipes, steel pipes, etc. that have branch pipes buried in existing soil.

In order to repair an existing underground pipe, as shown in Figure 1, a joint line (0
2) without joining, roll it up so that it slightly polymerizes to reduce its diameter, carry it into the existing underground pipe (03), release the rolled-up state here, and enlarge it. , the joint line (02) in the pipe axis direction is joined to create a pipe with a diameter smaller than the inner diameter of the existing underground pipe (03).
3) and connect its tip to the rear end (05) of the repair pipe (04) installed earlier, and then connect the underground pipe (03) and the repair pipe (01). There is a repair method for underground pipes called the pipe-in-pipe method, in which the gap (06) is filled with mortar.

If the existing underground pipe (03) has a branch pipe (07), as shown in Figure 2, to prevent mortar (08) from flowing into the branch pipe (07). After arranging the closing plate (09) at the open end of the branch pipe (07), mortar (08) is poured into the gap (06) between the buried pipe (03) and the repair pipe (04), and then , excavate a shaft (010) large enough for a worker to enter and work near the branch pipe (07), and from there, pass another branch pipe (011) through the underground pipe (03); Since it was connected to the internal repair pipe (04), the construction work was complicated, labor and cost increased, and the construction period was long.

The present invention was proposed to solve the above-mentioned problems, and its purpose is to make it possible to perform repair work on branch pipes from within the underground pipes, and to excavate shafts and repair other branch pipes. The gist of the present invention, which may be aimed at omitting complicated work such as joining pipes, is to provide a branch that has a stopper on the outer peripheral surface, is inserted into the branch pipe, and has one end opened into the repair pipe. The present invention is characterized by comprising a repair pipe, a gasket provided on the stotsunomy and in close contact with the outer surface of the branch repair pipe and the inner surface of the branch pipe, and a water stop fitting provided on the gasket and pressing the gasket. In the present invention, by having the above-mentioned structure, it is possible to repair the branch pipe part from inside the underground pipe, and therefore, it is possible to perform repair work on the branch pipe part from inside the underground pipe. This eliminates the need for complex construction work such as branch pipes, making repair work on branch pipes simple and easy, reducing costs and construction times. It becomes possible to repair the parts.

The present invention will be specifically explained below with reference to one embodiment shown in FIGS. 6 and 7. In Figure 6, (1)
is an existing underground pipe, (2) is a branch branch pipe, (3) is a repair pipe, (5) is mortar, (6) is a branch repair pipe, (7) is a water stop fitting, and (8) is a stopper. , (9) indicates a gasket. As shown in Fig. 5, the branch repair pipe (6) has a smaller diameter than the branch pipe (2) and is inserted into the branch pipe (2), and its lower end is in close contact with the inner surface of the repair pipe (3). The flange portion (6h) is provided with a flange portion (6h), and a stop horn ξ receiver (6C) provided on the intermediate outer circumferential surface of the flange portion (6h), the upper end of which opens into the inner branch pipe (2), and the lower end of which opens into the repair pipe (3). Water stop fitting (force is 6 cylinders (7α) as shown in Figure 6).

(7A) and (7C) are stacked and welded to each other, and the innermost cylinder (7a) is positioned inside the branch repair pipe (6), straddling the upper end of the branch repair pipe (6). Its lower end is welded to the inner surface of the branch repair pipe (6), and the outermost layer of the cylinder (7C
) is the gap (10
) from above, and its lower end is fitted with a gasket (9
).

The stopper (8) has an annular shape and is placed on the stopper receiver (6C). The gasket (9) is annular and connects the upper surface of the stopper (8) with the water stop fitting (the outermost layer of the cylinder (7).
C), and is brought into close contact with the inner surface of the branch pipe (2) and the outer surface of the branch repair pipe (6).

However, when performing repair work on the branch pipe (2),
First, as shown in Figure 7 (A), while checking the position of the branch pipe (2) through the small hole 0υ drilled in the repair pipe (3), insert the branch pipe (2) into the repair pipe (3). Drill a hole with a diameter slightly larger than the inner diameter of the hole. Next, as shown in (B), insert the water stop fitting (7) into the branch pipe (2) through this hole.
, gasket (9), and stopper (8) in this order. Next, as shown in (C) VC, branch repair pipe (6
) until the top surface of its flange part (6b) comes into close contact with the inner surface of the repair pipe (3), and then connect the center of the pipe to the branch pipe (2).
After aligning the centers, the outer peripheral edge of the flange portion (675) is fillet welded to the inner surface of the repair pipe (3). Then,
(D) As shown in K, pull the water stop fitting (7) by hand or with a device in the direction of the arrow in the figure, place the stopper (8) on the stopper receiver (6C), and place the gasket (9) on top of it.
Place the water stop fitting (the lower end of the outermost cylinder (7C) in contact with it and press it, and attach the gasket (9) to the branch pipe (2).
) and the outer surface of the branch repair pipe (6).

Next, as shown in ('E), the lower end of the innermost cylinder (7) of the water stop fitting (7) is fillet welded to the inner surface of the branch repair pipe (6).

After that, if necessary, perform repair painting around the fillet weld α31 (+4). In this way, the underground pipe (1) and the repaired pipe (3)
) When mortar (5) is injected into the gap between the branch pipe (2) and the gasket (9), this mortar (5)
) There is no way to go back inside.

Since all of these operations can be performed from inside the underground pipe (1), the conventional work of excavating a shaft and performing it from outside the pipe can be omitted, making the construction simple and easy. Therefore, the cost and construction period can be reduced.

Furthermore, even if the shaft cannot be excavated or the diameter of the branch pipe (2) is small, the branch pipe portion can be repaired.

In the above embodiment, the branch repair pipe (6) Vc stop collar receiver (6C) is provided and the stopper (8) is placed thereon, but the stopper can be attached to the branch repair pipe (6). Also, attach the water stop fitting (7) to six cylinders (
7α) (7h) (7C) were layered and exploded, but it is also possible to manufacture them as a single unit by casting etc.
7h) may be omitted and the outermost cylinder (7C) may be fixed to the upper end of the branch repair pipe (6) by fillet welding.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the outline of the pipe-in-pipe construction method, Figure 2 is a cross-sectional view showing the repair procedure for conventional branch pipe sections, and Figure 6 is a perspective view showing the outline of the pipe-in-pipe construction method.
7 to 7 show one embodiment of the present invention, FIG. 6 is a sectional view showing the branch structure, FIG. 4 is an enlarged view of the IV section in FIG. 6, and FIG. 5 is a perspective view of the branch repair pipe. , FIG. 6 is a perspective view of the water stop fitting, and FIG. 7 is a diagram showing the construction procedure. Strap 4...(8) Branch branch pipe...(2) Repair pipe...(3) Branch repair pipe...(6) Gasket...
・(9) Water stop fitting...(7) Sub-agent Patent attorney Kaihon Important Cultural Properties and 6 others Figure 3, Figure 4, Figure 5, Figure 6

Claims (1)

[Claims] A branch repair pipe that has a stopper on its outer circumferential surface and is inserted into the first branch pipe and has one end opening into the repair pipe, and a gasket that is provided on the stopper and tightly contacts the outer surface of the branch repair pipe and the inner surface of the branch pipe. and a repair branch structure characterized by having a water stop fitting that is provided on the gasket and presses the gasket.