JPH03107696A - Branch connection tube joint and connection method thereof - Google Patents

Abstract

PURPOSE:To secure perfect water stopping ability by providing a saddle part on a outer periphery of a tube body, also providing a branch connection part which has a receiving part and a connection part, and extending a cylindrical expansion/contraction sheet to be adhered to the inner surface of the tube body from an end of the connection part. CONSTITUTION:An adhesive 3 is coated on a peripheral edge of a branch hole 12 of a ribbed tube 1, while a connection part 23 of a branch connection tube 22 is connected to the branch hole 12. Then, a saddle 21 is adheringly connected to a surface of the adhesive 3. A diameter expanding jig is arranged in the branch connection tube 22 of a tube joint 2 and over the inside of the tube 1. An expansion/contraction sheet 4 extended from an end of the connection part 23 is bonded to an inner surface of the tube 1 on the peripheral edge of the branch hole 1. As a result, ability of water stopping from the inside of the tube is improved without projection into the tube and with a slight thickness of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a branch connection pipe joint for connecting a branch pipe to the peripheral wall of a pipe body, and a method for connecting this branch connection pipe joint.

(Prior Art) Conventionally, this type of branch connection pipe joint is known, for example, as disclosed in Japanese Unexamined Patent Publication No. 151411/1983.

As shown in FIG. 7, in this pipe joint, a branch hole is bored in the peripheral wall of the ribbed pipe a, and the proximal end of the branch pipe connection C is inserted into the branch hole. A saddle portion d protruding from the outer periphery of the ribbed tube a is applied to the outer circumferential surface of the ribbed tube a, and a protrusion e protruding from the joint surface of the saddle portion d is fitted between each rib 1 of the ribbed tube a. This prevents the formation of a gap between the joint surface of the saddle part d and the outer peripheral surface of the ribbed pipe a, and allows the branch connection pipe joint to be firmly joined to the ribbed pipe a. It is something. And usually the saddle part d
The joint between the two is strengthened by applying a bonding agent between the joint surface of the ribbed tube a and the outer circumferential surface of the ribbed tube a, or by wrapping a wire from the outer circumferential surface of the saddle portion d.

(Problems to be Solved by the Invention) However, the above conventional connection structure has the following disadvantages.

In other words, it is generally difficult to drill a branch hole in a ribbed pipe a with high precision at a construction site, and the forming precision of the protrusion e of the saddle part d and the ribbed pipe a is not very high. When the proximal end of the branch pipe connection C is aligned with the
The distance between the protrusion e and each rib 1 does not always match perfectly, and the spacing between the protrusion e and each rib 1 tends to become uneven.For this reason, this type of connection structure has an excellent filling effect. High viscosity bonding agents are often used, but applying such a bonding agent to a uniform thickness on the joint surface of the saddle portion d or the outer peripheral surface of the ribbed tube a is difficult because the viscosity of the bonding agent is high. Therefore, the application of bonding agent is complicated,
There was an inconvenience that the connection work was troublesome. Also,
Even if an attempt is made to spread the bonding agent by pressing the saddle portion d against the ribbed tube a to make the coating thickness uniform, it is difficult because the bonding agent has a high viscosity, and therefore the bonding surface of the saddle portion d There was a problem that high bonding strength could not be obtained between the ribbed tube a and, as a result, the sealing performance was poor. moreover,
If mud, sand, etc. adhere to the surface of ribbed pipe a,
There was an inconvenience that the saddle portion d did not follow the ribbed tube a, resulting in poor sealing performance.

The present invention has been made in view of the above circumstances, and aims to provide a branch connection pipe joint and its connection method that can ensure complete water-tightness by sealing the peripheral edge of the branch hole on the inner surface of the main pipe. purpose.

(Means for Solving the Problems) The branch connection pipe joint of the present invention is a pipe joint for connecting a branch pipe to the peripheral wall of a pipe body, and has a saddle portion curved approximately along the outer circumference of the pipe body. and a branch pipe connection part having a socket part for receiving the end of the branch pipe and a connection part connected to a branch hole drilled in the pipe body, and from the end of the connection part, adhesive is attached to the inner surface of the pipe body. The cylindrical stretchable sheet is stretched out.

Further, the method for connecting a branch connection pipe joint of the present invention is a method for connecting a pipe joint for connecting a branch pipe to a peripheral wall of a pipe body, and the method is a method of connecting a pipe joint for connecting a branch pipe to a peripheral wall of a pipe body, and the method is a method of connecting a pipe joint for connecting a branch pipe to a peripheral wall of a pipe body. After connecting the connection part of the branch connection pipe joint described above and bringing the saddle part into contact with the outer periphery of the liquid pipe body, insert a diameter expanding jig into the branch pipe connection part and the pipe body of this branch connection pipe joint. The elastic sheet is fixed to the branch pipe connection part by expanding the diameter of the branch pipe connection part of the diameter expansion jig, and the stretchable sheet is fixed to the branch pipe connection part by expanding the diameter of the inner tube part of this diameter expansion jig. It is attached to the inner surface of the tube.

(Function) The connecting method of the branch connection pipe joint of the present invention is as follows: First, the connection part of the branch pipe connection part is connected to the branch hole bored in the pipe body, and the saddle part is glued to the outer periphery of the pipe body. shall be. After that, a diameter expanding jig is placed between the branch pipe connection part and the pipe body of the branch pipe joint, and the diameter expansion jig is fixed to the branch pipe connection part by expanding the diameter of the branch pipe connection part, and the diameter expansion jig is fixed to the branch pipe connection part. By enlarging the diameter of the inner tube portion of the tool, the elastic sheet is adhered to the inner surface of the tube via an adhesive.

At this time, since the branch connection pipe joint has a cylindrical elastic sheet extending from the end of the connection part, the elastic sheet adheres to the inner surface of the pipe body, and the connection part and the branch hole are connected. Completely seal the gap.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

1 to 6 are process diagrams illustrating a method of connecting a branch connection pipe joint 2 (hereinafter simply referred to as a pipe joint) to a ribbed pipe 1.

That is, a bonding agent 3 is applied to the periphery of a branch hole 12 drilled in the ribbed tube 1, a connecting portion 23 of a branch connecting pipe 22 is connected to the branch hole 12, and a saddle portion is applied to the surface of the bonding agent 3. Glue 21. After that, the branch connecting pipe 2 of this pipe joint 2
2 and the inside of the ribbed tube 1, and the diameter expansion jig 5 is used to connect the inner surface of the ribbed tube I around the branch hole 12 to the inner surface of the ribbed tube I extending from the end of the connecting portion 23. This is for adhering the elastic sheet 4.

The ribbed tube 1 has a large number of annular ribs 11 on its outer peripheral surface, and is made of synthetic resin, ceramic, metal, or a composite material thereof. Note that although the ribbed tube 1 is used in this embodiment, the present invention is not limited to this; for example, a normal tube or a spiral tube without ribs can also be used.

The pipe joint 2 has a saddle portion 21 that is joined to the outer periphery of the lip 11 of the ribbed pipe 1, and a branch pipe connection pipe 22 that receives the end of a branch pipe (not shown) that is connected to the ribbed pipe 1. , molded from synthetic resin. And branch connection pipe 2
A stretchable sheet 4 that adheres to the inner surface of the ribbed tube 1 extends from the end of the ribbed tube 2 .

The saddle portion 21 is curved so as to roughly follow the outer circumference of the rib 11 of the ribbed tube 1, and a connection port 25 into which the branch connection tube 22 is inserted is formed approximately in the center of the saddle portion 21. . Although the saddle portion 21 has a rectangular shape in this embodiment, it is not limited to this, and may be square, circular, oval, or the like.

The branch pipe connection pipe 22 is composed of a connection part 23 connected to the branch hole 12 of the ribbed pipe 1, and a socket part 24 for receiving an end of the branch pipe (not shown). Connection part 2
3 is curved so that its lower end opening surface coincides with the branch hole 12 when connected to the ribbed tube 1, as shown in FIGS. 1 and 2. In addition, on the outer peripheral surface of the lower end,
A packing (not shown) that tightly contacts the peripheral edge of the branch hole 12, a plurality of pairs of locking protrusions (not shown) that engages with the peripheral edge of the branch hole 12, or the like may be provided in a protruding manner. On the other hand, the socket part 2
4 has an annular groove 241 formed along the circumferential direction on its inner wall surface, and an O-ring (not shown) is fitted into this annular groove 241 in contact with the outer circumferential surface of the annular portion of the branch pipe. Incidentally, the branch connecting pipe 22 configured as described above is connected to the saddle portion 21.
They are designed to be joined together by inserting the connecting portion 23 into the connecting port 25 of the two.

The stretchable sheet 4 is formed into a cylindrical shape that approximately matches the inner diameter of the connecting portion 23 of the branch connecting pipe 22 . As a specific example of this stretchable sheet 4, low density polyethylene or the like can be used.

One end of the stretchable sheet 4 is adhered to the inner wall surface of the connection portion 23 so that the stretchable sheet 4 extends from the lower end of the connection portion 23 .

Next, a method of connecting the pipe joint 2 as described above will be explained.

First, a branch hole 12 is bored at a predetermined location of the ribbed tube 1, as shown in FIG. The diameter of this branch hole 12 is approximately equal to the outer diameter of the connecting portion 23 of the branch connecting pipe 22 of the pipe joint 2.

Next, a filling type bonding agent 3 is placed between the ribs 11 in the area surrounding the branch hole 12 and covered by the saddle portion 21 of the pipe fitting 2.
Fill it with. At this time, the bonding agent 3 is applied to the rib 1 of the ribbed tube 1.
Paint it so that it is a little higher than the height of 1.

Subsequently, as shown in FIG. 2, the connection part 23 of the branch pipe connection pipe 22 is connected to the branch hole 12, and the joint surface of the saddle part 21 is pressed against the surface of the bonding agent 3, so that the outside of the saddle part 21 is Then, tighten and fix using wire or a locking band (not shown). In this state, the pipe joint 2 is joined to the ribbed tube 1, and the stretchable sheet 4 extends from the lower end of the connecting portion 23 into the ribbed tube 1. Note that an adhesive is applied to the outer circumferential surface of the portion of the stretchable sheet 4 that extends into the ribbed tube 1 before the pipe joint 2 is joined.

Thereafter, as shown in FIG. 3, the diameter expanding jig 5 is inserted from the socket 24 of the branch connecting pipe 22.

This diameter expanding jig 5 has two
The two rubber rings 52 and 53 are configured to expand and contract, respectively, by compressed air supplied from the outside. That is, a hollow portion is formed inside the rubber ring 52, 53, and a compressed air supply hose 54, 55 inserted through the cylindrical body 51 is connected to the hollow portion so as to communicate therewith. Further, on the outer peripheral surface of the cylindrical body 51,
Flange portions 56 are formed to sandwich the rubber rings 52 and 53 at the top and bottom, respectively. This collar portion 56 allows the rubber rings 52 and 53 to expand in the diametrical direction.

Then, as shown in FIG. 4, by inflating the rubber ring 52 located above the diameter expansion jig 5, the rubber ring 52 is pressed against the inner peripheral surface of the branch pipe connection part 23, thereby expanding the diameter. Hold the jig 5 in position.

Subsequently, as shown in FIG. 5, the rubber ring 53 located below the diameter expanding jig 5 is inflated. Then, the elastic sheet 4 is expanded in diameter by the expansion of the rubber ring 53, and is adhered to the peripheral edge of the branch hole 12 on the inner surface of the ribbed tube l. At this time, if some air is removed from the rubber ring 52 located above, the diameter expansion jig 5 is inserted deep into the ribbed tube 1, and the rubber ring 53 further expands in the diameter expansion direction, allowing it to expand and contract. The diameter of the flexible sheet 4 can be reliably expanded.

Thereafter, as shown in FIG. 6, the air in the diameter expanding jig 5 is removed to contract the rubber rings 52 and 53, and then the diameter expanding jig 5 is taken out from the socket 24 to complete the work.

In addition, in the embodiment described above, the rib 1 on the peripheral edge of the branch hole 12
Although the bonding agent 3 is injected and filled between the ribs 11, the connection method of the present invention is not limited to this, and the adhesive may be applied only to the outer peripheral end surface of the ribs 11.

(Effects of the Invention) As described above, according to the pipe joint of the present invention, the cylindrical stretchable sheet adheres while completely sealing the gap between the connection part of the pipe joint and the branch hole of the ribbed pipe. Therefore, it is possible to improve water stoppage from the inside of the pipe with only a small thickness of the sheet without protruding into the inside of the pipe.

Furthermore, according to the connection method of the present invention, the pipe joint can be bonded to both the outer periphery of the main pipe and the inner surface of the main pipe, so complete water-stopping properties can be ensured.

[Brief explanation of drawings]

1 to 6 show drawings according to the present invention, FIG. 1(a) is a partially cutaway side view showing a state in which a pipe joint is connected to a ribbed pipe, FIG. 1(bl is a front view of the same, Figure 2 (al is a partially cutaway side view showing the state in which the pipe joint is joined to the ribbed pipe;
Figure 2 (bl is the same front view, Figure 3 (a) is a partially cutaway side view showing the state in which the diameter expanding jig is inserted into the pipe joint, Figure 3 (1b)
) is a front view of the same, FIG. 4 (al is a partially broken side view showing the state in which the diameter expanding jig is held in the pipe joint, FIG. 4(b) is a front view of the same, and FIG. 5 (al is an elastic FIG. 5(b) is a partially cutaway side view showing the seat with its diameter expanded; FIG. 5(b) is a front view of the same, and FIG.
a) is a partially cutaway side view showing the state of the pipe joint after the work is completed, Fig. 6(b) is a front view of the same, and Fig. 7 is a section showing the connection structure of a conventional branch connection pipe joint to a ribbed pipe. FIG. l... Ribbed pipe (pipe body) 12... Branch hole 2... Pipe joint 21... Saddle part 22... Branch pipe connection part 23... Connection part 24... Socket part 4 ...Stretchable sheet 5...Diameter expansion jig

Claims (1)

[Claims] 1) A pipe joint for connecting a branch pipe to the peripheral wall of a pipe body, comprising: a saddle portion curved approximately along the outer circumference of the pipe body; and a socket for receiving an end of the branch pipe. and a branch pipe connection part having a connection part connected to a branch hole drilled in the pipe body, and a cylindrical elastic sheet adhered to the inner surface of the pipe body extends from the end of the connection part. A branch connection pipe fitting characterized by being issued. 2) A method for connecting a pipe joint for connecting a branch pipe to the peripheral wall of a pipe body, the method comprising: connecting the connecting portion of the branch connection pipe joint according to claim 1 to a branch hole drilled in the peripheral wall of the pipe body. At the same time, after bringing the saddle part into contact with the outer periphery of the pipe of the pipe body, while fixing it to the branch pipe connection part by expanding the diameter of the branch pipe connection part of the branch pipe diameter expansion jig of this branch connection pipe joint, A method for connecting a branch connection pipe joint, characterized in that a stretchable sheet is adhered to the inner surface of the tube via an adhesive by expanding the diameter of the inner tube portion of the diameter expanding jig.