JPH10185060A - Branch coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-water-cutting branch coupling which can repair the inside of a branch pipe smoothly by cutting off the water form a main pipe perfectly by the secure valve operation of a hole saw, for the repair of the branch pipe made by jointing a branch piping to the main pipe by using the non-water-cutting branch coupling housing the hole saw. SOLUTION: This branch coupling is composed by providing a branch pipe connection hole 13 at the middle part of a trunk 11 whose one end is fixed to the pipe wall of a main pipe, and screwing a hole saw 14 having an edge 141 for boring a main pipe wall at one end to the trunk 11, and the hole saw 14 is screwing fed by the shaft of a boring jig combined to the other side end of the trunk 11. In this case, a ring 16 for sealing compressed by the outer periphery of one end of the hole saw 14 is installed on the inner periphery at one end side of the trunk 11, and the inside of the edge 141 of the hole saw 14, and the other side end of the hole saw 14, are made in the noncommunicating condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a housing having a valve function.
It relates to a branch joint with built-in Luso.

[0002]

2. Description of the Related Art When a branch pipe is installed in a fluid transport pipe such as a gas pipe or a water pipe, a continuous water branch joint (so-called service pipe) is required in order to continue the fluid transport by the main pipe. It is known to use bis-). As one of such non-water divergent joints, there is known a body in which a hole having a ring-shaped blade is screwed into one end into a body having a branch pipe connection port, and FIG. 5 to (f) show a work procedure in the case of arranging and constructing a branch pipe by using the non-water-free branch joint.

In order to arrange and construct a branch pipe, as shown in FIG. 5A, a saddle portion 12 'of a continuous water branch joint A' into which a hole 14 'is screwed is connected to a main pipe B'. (For example, a heating wire is embedded in the saddle portion for this fusion). Then, (b) of FIG.
As shown in the figure, the branch pipe connection port 13 'of the continuous water branch joint A'
Is connected to the branch pipe D ', and the branch pipe is laid out. Further, as shown in FIG. 5C, the shaft head 22 of the drilling jig C ′ in which the shaft 22 ′ is inserted through the cap member 21 ′.
1 'is fitted into the square hole 142' at the other end of the hole saw, and the cap member C 'is connected to the other end of the body of the water-free branch joint A', and the shaft 22 'is rotated by a radial wrench.・
Forward, and as shown in FIG.
The wall of the main pipe B 'is pierced by the 4' blade 141 ', and the cut piece b' is held in the ring wall of the blade 141 '. Further, as shown in FIG. 5E, the cut piece b 'holding hole saw 14' is returned to the other end side in the trunk portion of the waterless branch joint A 'by the reverse rotation of the shaft 22'. Connect the inside of D 'to the main pipe B', and then remove the drilling jig.
As shown in FIG. 5F, a protective cap E ′ is covered on the other end of the trunk portion of the continuous water branch joint A ′, whereby the installation and water passage of the branch pipe are completed.

When repairing the branch pipe line constructed in this manner, the protective cap is removed, the drill jig C 'is mounted as shown in FIG. 6, and the cut jig b' is held by operating the jig. The hole h 'of the main pipe B' is closed with a hole 14 ', the branch pipe D' is cut off from the main pipe B ', and the branch pipe line is repaired.

[0005]

However, due to the internal pressure and external pressure acting on the main pipe B 'for a long period of time, the deformation of the hole h' of the main pipe B 'is unavoidable even if it is slight. The close contact between the hole 14 'and the circumferential surface of the hole h' cannot be expected. In FIG. 6, water leaks from the interface between the hole h 'of the main pipe and the hole 1410'. There is a fear that leak water may enter the branch pipe D 'through the threaded interface e' between the trunk 11 'of the branch joint and the hole 14'.

[0006] In the above-mentioned hole 14 ', the blade 1
41 'is formed into an annular wall shape so as to hold the cut piece b', and the shaft fitting hole 142 'is a square hole so as to transmit the rotation of the shaft 22' to the hole saw 14 'without idling. (Usually a hexagonal hole). In these processes, the through hole is roughed, a boring bar is passed through this hole, and the inner surface of the hole is finally processed by a boring machine. A method is used in which an electrode is inserted into the hole, the inner surface of the hole is subjected to electric discharge machining, and cutting chips are removed from the through hole by smooth circulation of a machining fluid to perform electric discharge machining to a final shape. Above, it is often a hollow body that is penetrated. However, in such a hollow hole source, as shown by a dotted line in FIG.
Water may also leak from the contact interface between the annular wall-shaped blade portion 141 'and the cut piece b', and this leaked water may enter the branch pipe D 'via the contact interface e' between the shaft fitting hole and the shaft. There is also.

However, under such inundation into the branch pipe, it is difficult to repair the branch pipe smoothly. However, a branch joint provided with a gate valve on the side surface of the trunk is fixed to the main pipe wall, the gate valve is closed, a punch is attached to the tip of the trunk, and then the gate valve is opened, and the inside of the punch is opened. The hole saw was advanced toward the main pipe wall to pierce the pipe wall, and after piercing, the hole saw was returned to its original position. Thereafter, the gate valve was closed and the punch was removed and removed. In a system in which a branch pipe is connected / arranged to the trunk portion of the later branch joint, and finally, a gate valve is opened to communicate the main pipe with the inside of the branch pipe (for example, see Japanese Utility Model Publication No. 59-17528). Although there is no problem, the structure and construction work of the branch joint are complicated.

[0008] An object of the present invention is to repair a branch pipe which has been branched and installed on a main pipe by using a non-water branch joint having a built-in hole so that the inside of the branch pipe can be repaired by a reliable valve action of the hole saw. An object of the present invention is to provide a non-water-distributable branch joint that can completely cut off water from a main pipe and smoothly repair the branch pipe.

[0009]

A branch joint according to the present invention has a branch pipe connection port provided at an intermediate portion of a trunk portion having one end fixed to a pipe wall of the main pipe, and the main pipe wall is provided at one end of the trunk portion. In a branch joint in which a hole saw having a drilling blade portion is screwed and the hole saw is screwed by a shaft of a drilling jig which is connected to the other end of the body portion, one end of the body portion is provided. A seal ring compressed at the outer periphery of one end of the hole saw is attached to the inner side of the side,
The inside of the blade of the ruso and the other end of the hole are not communicated with each other.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a side view showing a plastic unbreakable water branch joint (usually, an injection molded product) according to the present invention, and FIG. 1 (B) is a cross-sectional view of FIG. 1 (A). . 1 (a) and FIG. 1 (b)
In the figure, 11 is a trunk, 12 is a saddle provided at one end of the trunk 11, and 13 is a branch pipe connection provided in the middle of the trunk 11. Reference numeral 14 denotes a hole source screwed into the body 11.
There is an annular wall-shaped blade 141 at one end (the blade is saw-toothed)
The other end is provided with a square hole 142 (usually a hexagonal hole) into which a shaft head of a drilling jig described later is fitted. 143 is a male screw groove provided on the outer periphery of the hole 14, 111 is a female screw groove provided on the inner periphery of the body 11, and the hole 14 is moved by screwing by screwing these screw grooves. Is done.

Reference numeral 15 denotes a seal ring mounting groove formed on the inner peripheral surface near one end of the body 11, for example, an O-ring mounting groove (formed at the time of injection molding of a branch joint or formed by post-processing). ) And 16 are mounted sealing rings, for example, O-rings. E is a protective cap covered by the trunk 11 of the branch joint. A heating wire is embedded in the saddle portion 12, and in FIG. 1A, 121 and 121 indicate terminals of the heating wire.

The polygonal hole 142 and the annular wall-shaped blade 141 of the hole 14 can be machined by electric discharge machining or boring, but a partition 144 is provided between the polygonal hole 142 and the annular wall-shaped blade 143. Are left unconnected. The hole 14 has a polygonal hole 14 as shown in FIG.
The one obtained by welding the annular wall-shaped blade 141 to the block 140 obtained by processing 2 can also be used.

FIG. 3 shows a branch portion of a pipeline in which a branch pipe D is branched and installed on a main pipe B using the non-discharge water branch joint according to the present invention, and a hole holding a cut piece b of the main pipe is shown. -Luso 14 is located on the other end side of the branch joint body 11, and the inside of the main pipe and the inside of the branch pipe are communicated. In order to perform the installation of the branch pipe, the saddle portion of the continuous water branch joint is welded to the pipe wall of the main pipe by the heat generated by the heating wire, and a drilling jig [polygonal head ( Usually, a shaft having a hexagonal head) is rotatably inserted through a cap member through an O-ring so as to be rotatable in a water-tight manner). The branch pipe is connected to the branch pipe connection port of the branch joint, the branch pipe is installed, the airtight test of the branch pipe path is performed, and the shaft is rotated with a wrench. Then, the rotation of the shaft is transmitted to the hole saw, and the hole saw is advanced by screw feed by screwing with the inner surface of the trunk of the branch joint. The blade of the rotating / advanced hole saw comes into contact with the pipe wall of the main pipe, the hole is cut, and the cutting is completed when the cutting edge appears on the inner surface of the main pipe. It is pushed into the part by water pressure and is held by the hole saw. Thereafter, the hole is returned to the original position by the reverse rotation of the shaft, and the inside of the branch pipe is communicated with the main pipe. Then, the drilling jig is removed, and the protective cap is covered. The installation of pipes and the construction of water passage are completed.

In order to repair the branch pipe line constructed in this manner, the protective cap is removed, and a drill jig C is mounted as shown in FIG. Hole h
The cutting edge 1410 of the hole saw 14 is fitted into the hole, and the branch pipe D is repaired in this state. In this case, the hole h of the main pipe B is a part where the stress becomes large with respect to the internal pressure and the external pressure.
Since the main pipe B is a plastic pipe (flexible pipe) and is easily deformed, and furthermore, a creep is generated, the hole h in the pipe wall is larger than the hole at the time of perforation. There is a fear that the cutting edge 1410 of −14 cannot be brought into contact with the hole h with a sufficient contact pressure.

However, in the branch joint according to the present invention, the O-ring 16 is mounted on the inner peripheral surface near one end of the body portion 11, and the cutting edge 1410 of the hole saw 14 is attached to the main pipe B.
When the hole 14 is fitted in the hole h, the outer periphery of one end of the hole 14 (the smooth outer surface of the annular wall-shaped blade portion 141 without a thread groove) is brought into pressure contact with the O-ring 16 so that the O-ring 16 is sealed. −
Therefore, even if the water-tightness of the contact interface between the cutting edge 1410 of the hole 14 and the hole h is poor, the hole
At the threaded interface e between the branch joint body 14 and the branch joint body 11, even if water cannot be prevented from running, leakage of tap water to the branch pipe D can be reliably eliminated.

Further, since there is no communication between the inside of the blade portion 141 of the hole saw 14 and the polygonal hole, even if the water-tightness of the contact interface between the inner surface of the blade portion 141 and the cut piece b is poor, Leakage of tap water into the branch pipe D through the hole 14 can be eliminated. Therefore, water leakage from the main pipe into the branch pipe can be surely eliminated, and the branch pipe can be repaired smoothly.

In the above description, as shown in FIG. 1B, the diameter of the tip of the cutting edge is d ₂ and the inner diameter of the O-ring 16 is d ₃ so that the O-ring is not damaged by the cutting edge of the hole saw. Then, d ₃ > d ₂ . Furthermore, ho - Luso - the outer diameter of the end portion when the d ₁ of the compression amount Δe of O-rings,
Δe = (d ₁ −d ₃ ) / 2, and assuming that the thickness of the blade portion of the hole 14 is t, (d ₁ −d ₂ ) = t, and therefore Δe = [t− (d _3- d ₂ )] / 2, in order to increase the compression ratio of the O-ring and to guarantee the above-mentioned sealing property,
The thickness t of the blade of the hole saw is made thicker than usual.

In the above description, polyethylene, polyvinyl chloride, polypropylene and the like are used for the plastic of the main pipe, the branch pipe and the branch joint. An adhesive can also be used to fix the branch joint to the main pipe.
In addition, although the above description is made about the water pipe,
The perforated waterless branch joint according to the present invention can also be used for branch pipe construction of gas pipes.

[0019]

According to the continuous water branch joint of the present invention,
The branch pipe that was installed and branched from the main pipe using the built-in non-continuous water branch joint was repaired by using a seal ring and a hole source.
By the reliable valve action in cooperation with the above, the inside of the branch pipe is completely cut off from the main pipe, and the branch pipe can be repaired smoothly.

Further, in the seal ring, since the sliding ring is brought into sliding contact with the outer peripheral surface of one end of the hole saw, the sealing is performed.
The wear of the seal ring can be substantially eliminated, and even if the number of repairs is large, the sealability of the seal ring can be secured, and the smooth repair of the branch pipe can be guaranteed.

[Brief description of the drawings]

FIG. 1 (A) is a side view showing a branch joint according to the present invention, and FIG. 1 (B) is a cross-sectional view of FIG.

FIG. 2 is a perspective view of a hole saw screwed into a branch joint according to the present invention;
It is sectional drawing which shows another example of.

FIG. 3 is a cross-sectional view showing a branch portion using the branch joint according to the present invention.

FIG. 4 is an explanatory view showing a state in which a branch pipe is repaired using the branch joint according to the present invention.

FIG. 5 is an explanatory diagram showing a work procedure for arranging and passing water through a branch pipe using a conventional branch joint.

FIG. 6 is an explanatory view showing a state of repairing a branch pipe using a conventional branch joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS A Uninterrupted water branch joint 11 Body 12 Saddle part 13 Branch pipe connection port 14 Hole saw 141 Blade part 142 Polygon hole 15 Seal ring mounting groove 16 Seal ring B Main pipe C Drilling jig 22 Shaft 221 Shaft head

Claims (1)

[Claims] 1. A branch pipe connection port is provided in the middle of a body part having one end fixed to a pipe wall of a main pipe, and a hole saw having a blade part for drilling a main pipe wall at one end of the body part is screwed. In a branch joint in which a hole is screw-fed by a shaft of a drilling jig which is inserted and connected to the other end of the body, an outer periphery of one end of the hole is provided on an inner periphery of one end of the body. A branch joint, wherein a seal ring which is compressed in step (1) is mounted, and communication is not established between the inside of the blade portion of the hole saw and the other end of the hole saw.