JPH05272682A - Branching method for pipe - Google Patents

Abstract

PURPOSE:To carry out pipe branching work during the operation of a production line, etc., without suspending the supply of water in the pipe. CONSTITUTION:When a branched port is formed on a pipe 11, a sluice valve 28 having a straight passage 26 and a rod shaped drilling tool 41 which can penetrate through the passage 26 are used. One edge of the passage 26 of the sluice valve 28 is connected with a branched port formation predetermined part. The drilling tool 41 is allowed to penetrate through the passage 26, and drilling work is carried out at the branched port formation specified part.

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 an existing pipe, for example, a water supply pipe of a manufacturing plant.

[0002]

2. Description of the Related Art As a method of this kind, when forming a branch port in an existing pipe, water supply in the pipe is stopped and water near the planned branch port formation part of the pipe is discharged or a branch port of the pipe is planned to be formed. That freezes the water upstream and downstream of the pipe section using dry ice, etc. to prevent water from overflowing from the perforated branch port, and then perforates the planned branch port formation part of the pipe with a drilling tool It has been known.

[0003]

In the above method, the water supply to the production line or the like must be stopped through the pipe,
It was inconvenient because it could not be done while the production line was in operation.

An object of the present invention is to provide a pipe branching method capable of performing a branching work without stopping water supply in the pipe while the production line or the like is in operation.

[0005]

A pipe branching method according to the present invention uses a sluice valve having a straight passage and a rod-shaped perforating tool capable of penetrating the passage when forming a branching port in the pipe. It is characterized in that one end of the passage is connected to the portion, and the perforation tool is penetrated into the passage to perforate the portion for forming the branch opening.

[0006]

In the pipe branching method according to the present invention, one end of the passage is connected to the portion to be formed with the branch port, and the perforating tool is passed through the passage to perforate the portion to be formed with the branch port. , Water that overflows from the perforated branch is stopped.

[0007]

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

Referring to FIG. 1, in the method according to the present invention, a sluice valve 13 is connected to a portion of the main pipe 11 where a branch opening is to be formed through a connecting pipe 12, and a perforation for punching the portion where the branch opening is to be formed. Machine 14 and is used.

The main pipe 11 is an iron pipe having an outer diameter of 114.3 mm and a thickness of 4.5 mm. The inside of the main pipe 11 is filled with water 21 in the water supply.

The connecting pipe 12 is one size smaller than the main pipe 11,
It is a stainless steel tube with an outer diameter of 60.5 mm and a thickness of 3.8 mm. A flange 22 is provided at one end of the connecting pipe 12.

The sluice valve 13 is a valve chamber from the inlet 23 to the outlet 24.
A valve box 27 with a passage 26 extending straight through 25
And a valve rod 29 having a valve body 28 attached to the lower end and an upper portion protruding from the valve box 27, and a handle 31 attached to the protruding portion of the valve rod 29.

A flange 3 is provided at the edge of the inlet 23 and the outlet 24.
2 and 33 are provided respectively. The inner diameter of the passage 26 is substantially equal to the inner diameter of the connecting pipe 12. At the opening edge of the valve chamber 25 of the passage 26, the upward tapered valve seat 34 is placed so as to face the valve chamber 25 and face each other.
Are provided respectively. The valve body 28 has a downward tapered side surface 35 that is in close contact with the valve seat 34.

When the valve rod 29 is rotated by the handle 31, the valve rod 29 is moved up and down together with the valve body 28 by a screw mechanism (not shown). The valve body 28 is brought into close contact with the valve seat 34 to close the sluice valve 13, and the valve body 28 is separated from the valve seat 34 to open the sluice valve 13.

The punching machine 14 includes a rod-shaped punching tool 41 and a holder 42 that holds the punching tool 41 rotatably and axially movable.
And an electric drill 43 for rotating the punch 41. The perforation tool 41 includes a Horso 44 having an outer diameter slightly smaller than the inner diameter of the connecting pipe 12, and a stainless rotary shaft 45 having an outer diameter of 13 mm to which the Horso 44 is detachably attached. The holder 42 comprises a tubular body 47 with a dome-shaped one end closing wall 46. A guide 47A is provided in the tubular body 47.
A flange 48 is provided at the opening edge of the tubular body 47.
The closing wall 46 is provided with a gland packing box 49 having the rotating shaft 45 penetrating therethrough. On the peripheral wall of the tubular body 47, the cock 51
An attached drainage pipe 52 is provided. The diameter of the drain pipe 52 is about 10 mm.

The branching work will be described below.
The opening edge portion of the connecting pipe 12 is joined to the portion where the branch port is to be formed of the main pipe 11 by welding, and the flange 22 of the connecting pipe 12 and the inlet pipe side flange 32 of the sluice valve 13 are fastened with bolts and nuts not shown. Next, the sluice valve 13 is fully opened, and the perforation tool 41 is passed through the passage 26 of the sluice valve 13 from the outlet 24 of the sluice valve 13 with the Horso 44 first. Then, the outlet side flange 33 of the gate valve 13 and the flange 48 of the holder 42 are tightened with bolts and nuts. Then, with the cock 51 closed, the electric drill 43 is connected to the base end portion of the rotary shaft 45, and the piercing tool 41 is rotated by the electric drill 43 while pressing the Horso 44 against the portion where the branch opening is to be formed. Cut out the branch opening at the planned formation part. When the branch opening is formed, the perforator 41 is pulled back to the position where the Horso 44 fits in the holder 42, and the cock 51 is opened. Then, the water that vigorously flows out from the branch port causes the chips at the time of perforation and the cut-out branch port piece to pass through the passage 26 of the sluice valve 13 and the holder 42.
It is washed away inside. The branch piece that was washed away is the holder 42
Although left inside, the chips are discharged to the outside through the cock 51. Then, the sluice valve 13 may be closed and the holder 42 may be removed from the outlet side flange 33 of the sluice valve 13. If a branch pipe (not shown) is attached to the outlet side flange 33 of the gate valve 13,
This completes the branching work.

FIG. 2 shows a modification of the punching machine.
The drilling machine according to this modified example is the electric drill 43 of the above embodiment.
Instead of the above, the motor 62 and the speed reducer 63 are integrally incorporated in the holder 61, whereby the punching tool 64 is rotated and a propulsive force is applied.

In the above embodiment, it goes without saying that a drill or other cutting tool may be used instead of the horuso.

[0018]

According to the present invention, if the sluice valve is closed after perforation, the water overflowing from the perforated branch port can be stopped. Therefore, it is possible to stop the water supply in the pipe during the operation of the production line or the like. , Can do branch work.

[Brief description of drawings]

FIG. 1 is an assembly view of a sluice valve, a perforator and the like used in a method according to the present invention.

FIG. 2 is an assembly diagram corresponding to FIG. 1 showing a modification of the punching machine.

[Explanation of symbols]

 11 Piping 13 Gate valve 26 Passage 41 Perforator

Claims (1)

[Claims] 1. When forming a branch opening in a pipe (11), a sluice valve (13) having a straight passage (26) and a rod-shaped punching tool (41) capable of penetrating the passage (26) are used, and one end of the passage (26) is connected to a portion where a branch opening is to be formed. The pipe branching method is characterized in that the perforation tool 41 is penetrated through the passage 26 to perforate the portion at which the branch port is to be formed.