JPH10231985A - Branching method of fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a branched hole part after drilling and prevent deformation of a pipe by drilling the branched hole to be communicated to a branching port part on a fluid pipe after installing a joint having the branching port part on an outer peripheral surface of the fluid pipe made of a soft synthetic resin and pressure fitting a cylindrical reinforced pipe harder than the fluid pipe in this branched hole. SOLUTION: In the case of branching city water in the inside of a city water main pipe under a ceaseless water engineering method, a slit joint 3 having a branching pipe part 2 is installed on an outer peripheral surface of the city water main pipe 1 through a packing 4. Thereafter, a partition valve device 7 is connected to a flange 2a of the branching pipe part 2, and after a branched hole 8 is drilled on a side wall of the city water pipe 1 by a drilling machine installed on the flange 7b, a reinforced pipe 9 is fitted in the inside of this branched hole 8. Fitting of the reinforced pipe 9 in the branched hole 8 is carried out by installing an insertion device of the reinforced pipe 9 instead of the drilling machine after avoiding outflow of water from the branched hole 8 by lowering a valve element 6 of the partition valve device 7 and drawing up a valve element 6 again. Thereafter, the insertion device is removed, and branching work is finished by installing a branching pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for branching tap water by attaching a saddle joint for branching, a split T-tube, or the like to a water main pipe made of a soft synthetic resin.

[0002]

2. Description of the Related Art When branching tap water from a water main,
In many cases, a waterless construction method is used in which tap water is circulated in a water main. To briefly explain this method, first, a saddle joint for branching or a split T-shaped pipe is attached to the outer peripheral surface of the water main pipe while maintaining watertightness, and then the gate valves are opened, and the drilling machine is opened from those openings. A cutter is inserted, and a branch hole is formed in a part of the outer peripheral surface of the water pipe.

[0003] Then, after closing the gate valve and removing the drilling machine, a branch pipe is attached to the opening and the gate valve is opened.
The tap water of the water main can be branched to the branch pipe side.

In recent years, water mains have tended to be formed from a soft synthetic resin material, for example, polyethylene, etc., due to the problem of earthquake resistance, to increase flexibility and to be less likely to be damaged.

[0005] Even when a branch pipe is taken out from such a soft water main pipe, a branch saddle joint or a split T-shaped pipe is attached, and a branch hole is formed in this part by a cutter of a drilling machine. The tap water of the water main was branched.

[0006]

However, since the polyethylene pipe has internal stress during manufacturing, if a saddle joint for branching or the like is attached while leaving the drilled branch hole as it is, the branch formed once. As shown in FIG. 9, the hole loses roundness as shown in FIG. 9, and the stress at the time of saddle tightening concentrates on the deformed portion of the branch hole, the sealing force at the periphery of the saddle decreases, and the water main is deformed. Water leakage.

Further, since the water main is soft, if a relatively large branch hole is formed, the strength of the portion is reduced, and the pipe may be deformed due to saddle tightening or ground vibration. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. By reinforcing a branch hole after drilling, it is possible to prevent deformation of a pipe and prevent occurrence of water leakage and the like. It is an object of the present invention to provide a method for branching a fluid.

[0009]

In order to achieve the above object, a method of the present invention is a method of branching a fluid in a fluid pipe made of a soft synthetic resin, wherein a branch port is provided on an outer peripheral surface of the fluid pipe. After fitting a joint having a portion, a branch hole communicating with the branch port portion is formed in the fluid pipe, and a cylindrical reinforcing pipe harder than the fluid pipe is press-fitted into the branch hole, and the branch port portion is formed. The fluid is branched into a branch pipe connected to the fluid.

[0010] A flange is formed at the base end of the reinforcing pipe,
It is preferable that this flange be in contact with the wall surface of the fluid pipe.

It is preferable that the tip of the reinforcing pipe has a tapered shape, and an annular projection is formed on the outer peripheral surface of the tip so as to be engageable with the inner surface of the opening of the branch hole.

Preferably, a spiral groove or a number of grooves are formed on the outer peripheral surface of the reinforcing pipe.

[0013] It is preferable that the reinforcing pipe is formed to be long so that the tip thereof can be in contact with the inner wall of the fluid pipe, and has a plurality of notched holes on the outer peripheral surface.

According to the fluid branching method of the present invention, the shape of the branch hole is maintained even if the fluid pipe is soft by press-fitting the hard reinforcing pipe into the branch hole formed in the fluid pipe. As a result, there is no danger that the fluid pipe will be deformed from the branch hole and water leaks from the seal will occur.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 to FIG. 4 show a method of branching tap water in a water main by a waterless construction method.

In FIG. 1, a half joint 3 having a branch pipe portion 2 facing one side is mounted on the outer peripheral surface of a polyethylene main water pipe 1 via a packing 4.

The flange 2a of the branch pipe 2 has a threaded rod 5
The left flange 7a of the gate valve device 7 having the valve element 6 which is moved up and down by a bolt is bolted.

In order to branch the tap water in the tap main 1, as shown in FIG.
A circular branch hole 8 is formed in the side wall of the water main 1 by a drilling machine (not shown) attached to b.

Next, as shown in FIG. 3, a reinforcing pipe 9 made of a hard synthetic resin or stainless steel is fitted into the formed branch hole 8 until its flange 9a contacts the wall surface of the pipe.

As shown in FIG. 5, the reinforcing tube 9 has a tapered distal end to facilitate insertion into the branch hole 8 and an outer diameter at the base end slightly larger than that of the branch hole 8. Press-fitted, deformed and drilled
The retouching and retaining are performed.

When fitting the reinforcing pipe 9 into the branch hole 8, the valve 6 of the gate valve device 7 is once lowered to prevent water from flowing out of the branch hole 8, as shown in the imaginary line in the drawing. After doing
This is performed by mounting an insertion device (not shown) for the reinforcing pipe 9 in place of the drilling machine, and pulling up the valve body 6 again.

After fitting the reinforcing pipe 9 into the branch hole 8,
As shown in FIG. 4, the insertion device is removed, the branch pipe 10 is attached, and the valve body 6 of the gate valve device 7 is pulled up.
Can be branched to the branch pipe 10 side while tap water is circulated.

6 to 8 show modified examples of the reinforcing pipe 9. FIG. In FIG. 6, an annular protrusion 11 is formed on the outer peripheral surface of the distal end portion of the reinforcing tube 9, and a part of the annular protrusion 11 is locked to the inner surface of the opening of the branch hole 8 so that the reinforcing tube 9 is prevented from falling off.

In the structure shown in FIG. 7, a spiral groove 12 is formed on the outer peripheral surface of the reinforcing pipe 9, and the reinforcing pipe 9 is screwed into the branch hole 8 so as to be prevented from falling off. 13 is
A slot-like concave groove formed in the flange 9a can be mounted using a screwing tool. In addition,
Instead of the spiral groove 12, it is also possible to simply insert by strong pressure by forming a large number of grooves in the groove direction. This is because the reinforcing pipe 9 has higher strength than the water main 1, and can easily bite into the main.

The reinforcing pipe 9 shown in FIG. 8 has a cylindrical portion having a long dimension, and the tip thereof is brought into contact with the inner wall of the water main pipe 1.
Even the thin water main 1 is made hard to come off. A plurality of notches 14 are formed in the outer peripheral surface of the cylindrical portion so as not to hinder the flow of tap water. In this case, the flange can be omitted.

The shape of the notch 14 may be circular or another shape.

As described above, according to the method of the present invention, the hard reinforcing pipe 9 is inserted into the branch hole 8 to modify the shape of the branch hole 8 and to reinforce the portion, and then the water supply Since the tap water of the pipe 1 is branched, even when the main pipe 1 is a soft pipe such as polyethylene, a large stress does not act on the branch hole 8 when the half joint 3 is tightened. .

As a result, the water main 1 is prevented from being deformed, and there is no possibility that a water leakage accident or the like will occur.

The present invention is not limited to the above embodiment, but is also applicable to a case where a branch hole is formed in the upper wall of the water main 1 and a saddle type joint having a branch plug is attached around the branch hole for branching. Applicable.

Further, in the embodiment, the branching method in the non-water-disconnected state has been described. In this case, the gate valve device 7 becomes unnecessary.

The reinforcing pipe 9 may be simply cylindrical without forming the flange 9a.

[0032]

According to the present invention, the following effects can be obtained.

(A) Even if the fluid pipe is soft by fitting a hard reinforcing pipe into the branch hole formed in the fluid pipe,
Since the branch hole is reinforced so that the shape of the branch hole is maintained, there is no possibility that the fluid pipe is deformed from the branch hole portion and water leakage or the like occurs from the seal portion.

(B) According to the second aspect of the present invention, the flange acts not only as a stopper for positioning but also the bending load acting on the fluid pipe is supported by the flange simply by press-fitting the reinforcing pipe into the branch hole. And the branch hole portion is reinforced more strongly.

(C) According to the third aspect of the present invention, the press-fitting of the reinforcing pipe is facilitated and the reinforcing pipe is prevented from coming off.

(D) According to the fourth aspect of the present invention, the effect of preventing the reinforcing pipe from coming off is further enhanced.

(E) According to the fifth aspect of the present invention, even if the fluid pipe is thin, effective removal is performed, and the reinforcing pipe is stably held by the fluid pipe.

[0038]

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional front view showing a state where a half joint is attached to a water main according to an embodiment of the present invention.

FIG. 2 is a vertical front view of the center showing a state in which a branch hole is formed in the water main.

FIG. 3 is a central vertical sectional front view showing a state in which a reinforcing pipe is press-fitted into a branch hole.

FIG. 4 is a central longitudinal sectional front view showing a state where a branch pipe is connected.

FIG. 5 is a partially cutaway enlarged front view of a reinforcing pipe.

FIG. 6 is a partially cutaway front view showing another embodiment of the reinforcing pipe.

FIG. 7 is a partially cutaway front view showing another embodiment of the reinforcing pipe.

FIG. 8 is a front view showing still another embodiment of the reinforcing pipe.

FIG. 9 is a plan view showing an example of forming a branch hole in a fluid pipe made of a soft synthetic resin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water main pipe (fluid pipe) 2 Branch pipe part (branch port part) 2a flange 3 Half joint 4 Packing 5 Screw rod 6 Valve body 7 Dividing valve device 7a, 7b Flange 8 Branch hole 9 Reinforcement rod 9a Flange 10 Branch pipe Reference Signs List 11 annular projection 12 spiral groove 13 concave groove 14 cutout hole

Claims (5)

[Claims] 1. A method for branching a fluid in a fluid pipe made of a soft synthetic resin, comprising: attaching a joint having a branch port to an outer peripheral surface of the fluid pipe, and communicating the fluid pipe with the branch port. A bifurcation of a fluid, characterized in that a bifurcated hole is formed, a cylindrical reinforcing pipe harder than the fluid pipe is press-fitted into the bifurcated hole, and the fluid is bifurcated into a bifurcated pipe connected to the bifurcation port. Method. 2. The method according to claim 1, wherein a flange is formed at a base end of the reinforcing pipe, and the flange is brought into contact with a wall surface of the fluid pipe. 3. The fluid according to claim 1, wherein a tip of the reinforcing pipe is tapered and an annular projection is formed on an outer peripheral surface of the tip so as to be engageable with an inner surface of the opening of the branch hole. Branching method. 4. The method according to claim 1, wherein a spiral groove or a number of grooves are formed on an outer peripheral surface of the reinforcing pipe. 5. The reinforcing pipe according to claim 1, wherein the reinforcing pipe is formed to be long so that its tip can abut on the inner wall of the fluid pipe, and has a plurality of cutouts on its outer peripheral surface. The method for branching a fluid according to the above.