JPH0681994B2 - Joint method of pipe ends in pipe reverse method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a joint method for pipe ends in a pipe reverse method.

(Prior Art) Conventionally, the joint structure of the pipe end portion in the pipe reverse method uses a short pipe made of polyethylene having a flange at one end, which is called a brim short pipe, and this brim short pipe is expensive and immediately Was not available and therefore could not respond to a sudden accident.

In addition, as shown in FIG. 3, the brim short pipe (A) is spliced before joining the polyethylene insertion pipe (2) inserted into the existing pipe (1) and the brim short pipe (A). The ring (B) and the short pipe (C) are temporarily piped, and the end of the polyethylene insertion pipe (2) that is to be joined with the brim short pipe (A) is shaved so as to be joined by an electric planer or the like and confirmed. After that, the joint surfaces are cleaned with an acetone solution, and the cores are aligned so as not to shift. Next, the hot plates are melted on both sides at 180 ° C to 210 ° C, and after removing the hot plates, they are welded and joined by a manual crimping machine and naturally cooled to complete the joining. Since the operation of the crimping machine is to be rotated by hand and depends on the sense of the operator and requires special technology, it was unreliable.

Then, for the insertion pipe welded to these brim short pipes, a joint ring (B) and a short pipe (C) in which temporary pipes are provided at the end of the existing pipe and a special short pipe (Z) are separately provided as a rubber ring, a plate rubber packing, and a pressing ring. It was fixed through the, and the work was also extremely complicated.

(Problems to be Solved by the Invention) Therefore, the present invention provides a joint method for pipe ends in the pipe reverse method, which eliminates the above-mentioned drawbacks, uses inexpensive parts, and is easy to work and surely constructs. It is a thing.

[Structure of Invention]

(Means for Solving Problems) An embodiment of the present invention will be described below with reference to the drawings.
Existing pipe (1) and insertion pipe (2) to be inserted into the existing pipe
At the pipe end in the pipe reverse method in which the gap between and is filled with cement milk (X), the stainless core (3) is inserted into the end of the insertion pipe (2) protruding from the existing pipe (1), and at both ends. A first joint pipe (4) having flanges (4a) (4b) and a step portion formed in the middle thereof is provided by being inserted from the insertion pipe (2) toward the end of the existing pipe (1). The tip of the joint pipe is a rubber ring (5a) on the end of the existing pipe (1).
And a stainless core (3) having a detent of an annular projection at the mouth end, which is fixed via a push ring (7) and at the rear end of the joint pipe (4) via a rubber ring (5b). It is composed of an inserted insertion tube (2) and a second joint tube (6) having a flange (6a) at one end and having a step portion formed in the middle thereof.

The cement milk inlet (Y) was provided in the first joint pipe (4), and the first joint pipe and the second joint pipe (6) were formed in their flanges (4b) and (6a). The bolt is put through the hole and tightened to fix.

Furthermore, when connecting the ends of the existing pipe (1) and the insertion pipe (2) constructed by this method with the other existing pipe (1 '), as shown in FIG. Flange (8
A new cast iron pipe (8) having a) is fitted into the second joint pipe (6) and fixed via a rubber ring (5c) and a push ring (7 '). The end is
The connecting ring (9) is connected to another existing pipe (1 ') via rubber rings (5d) (5e) and push rings (7 ") (7).

〔The invention's effect〕

According to this invention, the first joint pipe, the second joint pipe, the stainless core / rubber ring, and the push ring can be constructed with simple components, and the cost is low. Since the second joint pipe has the step portion formed in the middle thereof, it is immovable, the insertion pipe can be protected forever, and the work is simple and extremely advantageous.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of the present invention,
FIG. 2 is a partially cutaway sectional view showing the usage state of the present invention,
FIG. 3 is a partially cutaway sectional view showing a conventional example. 1 ... Existing pipe, 2 ... Insertion pipe, 3 ... Stainless steel core, 4 ... First joint pipe, 4a, 4b ... Flange, 5a,
5b, 5c, 5d, 5e …… Rubber ring, 6 …… Second joint pipe, 6a
...... Flange, 7,7 ', 7 ", 7 ...... Pressing ring, 8 ...... New cast iron pipe, 8a ...... Flange, 9 ...... Spring ring, A ...... Brim short pipe, X ...... Cement milk Y ...... Cement milk inlet, Z ... special short pipe,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Souzo Ori 9-932 Motomachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Hiroshi City Waterway Bureau (72) Yuji Fujita 9 Motomachi, Naka-ku, Hiroshima City, Hiroshima Prefecture No. 32 Inside the Hiroshi Municipal Waterworks Bureau (72) Inventor Hiroshi Yamada 9-9 Motomachi, Naka-ku, Hiroshima City Hiroshima Prefecture Hiroshima Prefecture No. 32 Inside the Hiroshi City Waterway Bureau (72) Toshiyuki Yoneda 9 Motomachi, Naka-ku, Hiroshima City Hiroshima Prefecture No. 32, Hiroshi Municipal Waterworks Bureau (72) Inventor Toshio Inoue 9th 32 Motomachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Hiroshima Prefecture (56) Reference JP-A-58-59808 (JP, A) Actual public Sho 55-48917 (JP, Y2)

Claims (1)

[Claims] Claim: What is claimed is: 1. When treating a pipe end in a pipe reverse method in which cement milk is filled in a gap between an existing pipe and an inserting pipe inserted into the existing pipe, stainless steel is provided at an end of the inserting pipe protruding from the existing pipe. While inserting the core, a first joint pipe having flanges at both ends and a step portion formed in the middle is fitted and inserted from the insertion pipe end toward the existing pipe end, and the tip end of the joint pipe and the existing pipe are installed. An insertion tube in which the end of the tube is fixed via a rubber ring and a push ring, and a stainless core having a detent of an annular projection is inserted at the mouth end of the joint tube via a rubber ring at the rear end of the joint tube. It has a flange on one end,
A joint method for pipe ends, characterized in that the pipe is fixed with a second joint pipe having a step formed midway.