JPH11141734A - Connecting method for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate absobutely no clearance between a new pipe ad an existing pipe irrespectively of pulling the new pipe by a fixing means and a fastening means when the new pipe is connected to the existing pipe. SOLUTION: In a method for connecting a new pipe 3 to an existing pipe line 1 by inserting a pipe end socket 1B into an insert port, a fixing means 5 comprising a ring body 5A with outside diameter smaller than the inside diameter of the existing pipe 1 and a fluid bag body 5B provided in the outer periphery of the ring body 5A and expanded between the ring body 5A and the inner surface of the existing pipe 1 to be consolidated and filled is arranged in the existing pipe 1 so that the ring body 5A is concentric with a pipe shaft 5D. The fluid bag body 5B is expanded to come into contact with the inner surface of the pipe so that holding force capable of meeting an axial tensile force can be obtained. Then, the other end opened surface 3B of the new pipe 3 whose insert port 3A is inserted to the pipe end socket 1B of the existing pipe line is connected to the ring body 5A of the fixing means 5 by fastening means 4. The fastening means 4 are fastened to pull the new pipe 3 until the insert port 3A of the new pipe 3 comes into contact with the interior end 1C of the socket of the existing pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for joining pipes, and more particularly, to a method for joining pipes suitably used for large diameter pipes.

[0002]

2. Description of the Related Art Conventionally, when connecting a resin pipe such as an FRPM pipe whose connection portion is of a slip-on type, a fixing tool is attached to an insertion end face 1A of an existing pipe 1 as shown in FIG. 2, a wire 4A and a tightening device 4 such as a winding device 4B are connected between the fixing device 2 and the fixing device 2 hooked on the open end 3A of the new pipe 3; By tightening the two, the new pipe 3 is drawn into the socket 1B of the existing pipe 1 and connected.

[0003]

However, when the pipes are connected by the above-described method, the insertion end face 1A and the receiving end 1
6, a gap 2B corresponding to the thickness of the engaging claw 2A of the fixing tool 2 is generated in the order of 10 to 15 mm as shown in FIG.
In the case of a sewage pipe or the like, there has been a problem that solid matter is caught in the gap or filth stays, which causes a reduction in flow efficiency.

However, such a problem can be solved by connecting the new pipe to the existing pipe as described above, and then pushing the new pipe in the axial direction to eliminate the gap 2B. However, in the case of a pipe that can be entered by a person, Since the weight of the pipe is also large, a considerably large pushing device is required to move the tube, and it is too wasteful to prepare such a large device for movement of only about 10 to 15 mm. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and when a new pipe is connected to an existing pipe, a fixture is fixed in the existing pipe, and the fixture is pulled in with the fastener. Nevertheless, the object of the present invention is to provide a method for joining pipes that does not cause any gap between the new pipe and the existing pipe.

[0006]

That is, a method of joining a pipe according to the present invention is a method of joining a new pipe to an existing pipe by inserting an insertion port into a pipe end receiving port. A fixture comprising a ring body having an outer diameter smaller than the inner diameter of the pipe and a fluid bag body provided on the outer circumference of the ring body and inflated between the inner surface of the existing pipe and being compacted in the existing pipe, The ring body is disposed concentrically with the pipe axis, and the fluid bag is inflated and pressed against the inner surface of the pipe to have a holding force capable of resisting the axial pulling force. Thereafter, the fluid bag is inserted into the pipe end port of the existing pipe. Is connected between the other end opening surface of the new pipe and the ring body of the fixing tool by a fastener, and the fastener is tightened so that the opening of the new pipe contacts the inner end of the existing pipe receiving port. The feature is that it is pulled up to.

[0007] That is, the fixture is not the insertion end face of the existing pipe,
The new pipe is pulled in by being fixed to the inner wall of the pipe by crimping and connected to the end face of the opening with a fastener. Therefore, when connecting the new pipe to the existing pipe, the engagement point of the fixture with the pipe is not the pipe end face, so that the pipe can be connected without generating a gap between the insertion end and the back end of the socket. It is.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 is a side view of a fixture used in the pipe joining method of the present invention, FIG. 2 is a front view thereof, and FIGS. 3 and 4 are explanatory views showing steps of the pipe joining method of the present invention.

In FIGS. 1 and 2, the fixture 5 is provided between the ring 5A having an outer diameter smaller than the inner diameter of the existing pipe 1 and the outer periphery of the ring 5A, and expands between the inner surface of the existing pipe 1. And a fluid bag body 5B to be compacted.

In the above, the ring body 5A is provided with flange-like edges 5C, 5C so as not to come off when the fluid bag body 5B is inflated. A ring 5D is provided.

In the drawing, reference numeral 5E denotes a moving wheel for movement in the pipe, and 5F denotes a pump device for pressurizing and supplying a fluid such as air, water or oil to the fluid bag 5B. Then, the fixture 5 is disposed in the existing pipe 1 so that the ring body 5A is concentric with the pipe shaft 1D, and the fluid bag body 5B is inflated as shown in FIG.

Due to this inflation, the fluid bag body 5B is compacted and filled between the ring body 5A and the inner surface of the tube 1, and is strongly pressed against the inner surface of the existing tube 1. As a result, a strong frictional force acts, and the ring body 5A moves in the axial direction. Fixed for.

Thereafter, as shown in FIG. 4, an insertion port 3 A is inserted into the pipe end port 1 B of the existing pipe 1, and the other end opening face 3 B of the new pipe 3 and the ring body 5 A of the fixture 5 are connected. Are connected with the fastener 4.

Then, the tightening device 4 is tightened, and the new pipe 3 is pulled in until the insertion port 3A of the new pipe comes into contact with the receiving end 1C of the existing pipe 1. After the retraction, if the fluid pressure in the fluid bag body 5B is released, the fixture 5 becomes movable, and is moved to the next connection location of the new pipe.

In the above method, the other end opening surface 3 of the new pipe 3
The same fixing device 2 and tightening device 4 as those used in the related art are used.

[0016]

As described above, according to the pipe joining method of the present invention, when a new pipe is connected to an existing pipe, a fixture for pulling in the new pipe is provided on the inner surface of the existing pipe wall. Since the pressure is fixed by inflation using the inflation pressure, there is no gap after hooking the engagement claw between the pipe insertion port and the back end of the pipe after connection, as in the past. The connection can be made in a state where the insertion end face and the back end of the existing pipe are in contact.

Also, needless to say, there is no need for a large-scale push-in device which would otherwise be required to eliminate the gap after connecting the pipes, so that the pipes can be connected very inexpensively and easily. Having.

Further, when the method for joining tubes according to the present invention is carried out, only the in-pipe fixture is newly prepared, and other members can be used in the related art.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fixture used in the method of the present invention.

FIG. 2 is a front view of a fixture used in the method of the present invention.

FIG. 3 is a side sectional view illustrating an embodiment of the method of the present invention.

FIG. 4 is a plan sectional view illustrating an embodiment of the method of the present invention.

FIG. 5 is an explanatory plan sectional view of a conventional method.

FIG. 6 is an enlarged explanatory sectional view of a main part of a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pipe 1A Insert end face 1B Existing pipe port 1C Reception port inner end 1D Pipe shaft 2 Fixing tool 2A Engaging claw 2B Clearance 3 New pipe 3A Insertion 3B Open end of other end 4 Tightening tool 4A Wire 4B Winding device Reference Signs List 5 Fixture 5A Ring body 5B Fluid bag body 5C Flanged edge 5D Hook ring 5E Moving wheel 5F Pump device

Claims (1)

[Claims] 1. A method for joining a new pipe to an existing pipe by inserting an insertion port into a pipe end receiving port, comprising: a ring body having an outer diameter smaller than the inner diameter of the existing pipe; A fixture comprising a fluid bag body that is compacted and filled by inflating between the existing pipe inner surface and the existing pipe inside the existing pipe, wherein the ring body is arranged concentrically with the pipe axis, The other end opening surface of the new pipe in which the fluid bag body is inflated and pressed against the inner surface of the pipe to have a holding force capable of resisting the tensile force in the axial direction, and then the insertion end is inserted into the pipe end receiving port of the existing pipe line and the fixture And connecting the ring body with the ring body with a tightening tool, tightening the tightening tool, and pulling in the new pipe until the insertion opening of the new pipe contacts the inner end of the existing pipe receiving port.