JPS634078B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for attaching a joint body to a main pipe, and closing the passage entrance of the joint body by a punching machine attached to the joint body. and, with the entrance of the passage for inserting and removing the sliding valve body of the joint body closed by a shutter device attached to the joint body, inserting the blade of the punching machine into the passage; forming a branch port in the main pipe, pulling out the blade from the passage, inserting the sliding valve body of the shutter device into the passage from the passage for inserting and removing the sliding valve body, and inserting the sliding valve body into the passage. The passage is closed by a valve body, the perforator is removed from the joint body, a branch pipe is connected to the passage and connected to the joint body, the passage is opened by the drawer of the sliding valve body, and the sliding The present invention relates to an uninterrupted flow branching and extraction method in which a valve body insertion/removal passage is closed with a closure and the shutter device is removed from the joint body.

[Prior art]

Conventionally, as shown in FIG.
The swinging valve body 22, which closes with a bias of 1, is placed in advance in the joint body 0
2, and after forming a branch port 17 in the main pipe P from the passage 01 with a drilling machine 16, with the drilling machine 16 blocking leakage from the passage 01, slide the sliding valve body 0.
4, push open the swinging valve body 22, insert the sliding valve body 04 into the passage 01, press the sliding valve body 04 against the valve seat 24 with the bolt 23, and close the passage 01, as shown in FIG. After removing the punch 16 and connecting the branch pipe 18 to the passage 01, the sliding valve body 04 is removed from the joint body 02, and the spring 21
Then, the swinging valve body 22 was closed, and the branch pipe connection was performed without leakage while fluid transport through the main pipe P continued. (Similar technologies include, for example, Jikoaki
(See Publication No. 38-6066).

[Problem that the invention seeks to solve]

However, the swinging valve body 22 becomes uncomfortable when the sliding valve body 04 is inserted, and the swinging valve body 22 becomes stuck when the sliding valve body 04 is inserted.
Furthermore, with the swinging valve body 22 closed by the spring 21, it is actually extremely difficult to prevent leakage in a highly reliable state over a long period of time. When 02 is buried, the rocking valve body 22 is likely to open due to earth pressure, water pressure, etc., resulting in a large amount of leakage.

SUMMARY OF THE INVENTION An object of the present invention is to reliably prevent leakage of a sliding valve body from an insertion/removal passage, and to facilitate insertion of the sliding valve body into a joint body.

[Means to solve the problem]

The characteristic means of the present invention is that a plug as a closure for closing a passage for inserting and removing a sliding valve body of a joint body closes its entrance to a plug fitting portion of the joint body before forming a branch port of the main pipe. Installed in the pulled-out state, after connecting a branch pipe to the joint body and pulling out the sliding valve body from the passage for insertion and removal of the sliding valve body in order to open the passage of the joint body, and after connecting the branch pipe to the joint body. Before removing the shutter device, the plug is inserted into the plug fitting portion and rotated to make a tight contact, the sliding valve body insertion/removal passage and the plug fitting portion are closed with the plug, and the plug is closed. engaging the protrusion with the stepped part of the plug fitting part,
The objective is to prevent the stopper from coming off, and its effects are as follows.

[Effect]

In other words, before forming the branch port of the main pipe, the plug is attached to the plug fitting part in a drawn-out state that closes the inlet, and when the sliding valve body is inserted into the passage to close the passage of the joint body, the plug slides. Since it is possible to prevent contact with the sliding valve body in the passage for inserting and removing the valve body, the sliding valve body can be easily inserted without being hindered by the plug, and the plug is not damaged by the sliding valve body. Therefore, the passage for inserting and removing the sliding valve body can be reliably blocked by the plug after construction.
In addition, since leakage from the plug-fitting portion can be prevented by the plug, branch pipe connections can be performed satisfactorily without leakage.

After pulling out the sliding valve body from the sliding valve body insertion/removal passage and before removing the shutter device from the joint body, insert the plug into the plug fitting part and rotate it so that it fits tightly, Since the sliding valve body insertion/removal passage and the plug fitting part are closed with the plug, even if the shutter device is removed, leakage from the sliding valve body insertion/removal passage and the plug fitting part can be prevented by the plug. There is no damage to the valve body.

Furthermore, as the stopper is rotated, the protrusion and the stepped portion engage to prevent the stopper from coming off, so leakage can be prevented more reliably over a long period of time than in the prior art described above.
Even if the joint body is buried, the plug will not be opened by earth pressure, water pressure, etc., and leakage can be reliably prevented.

〔Effect of the invention〕

As a result, leakage caused by the structure for inserting and removing the sliding valve body is reliably prevented with no damage to the plug, and even if the joint body is buried, it is reliably prevented for a long time. In addition, the sliding valve body can be easily inserted, and the work can be performed with excellent leakage prevention reliability and workability.

〔Example〕

Next, an example will be explained.

First, the joints and tools used will be explained with reference to FIGS. 1 to 5.

A passage 1 is formed in the joint body 2 to be attached to the main pipe P, for insertion and removal of the punching machine and for connecting the branch pipe.
A connecting flange 3A is provided to connect the branch pipe 18 to the passage 1 and connect it with bolts.
and the passage 1 is connected to the branch port 17.
The branch pipe 18 attached to the connecting flange 3A can be connected to the main pipe P through the branch port 17 and the passage 1.

A shutter device 13, which is equipped with a sliding valve body 4 for closing the passage 1 and can be slidably operated by a rotary handle 11B and a bolt, is connected to a connecting flange 3 of the joint body 2.
A plug fitting part for attaching a plug 7 that is removably connected to B with bolts, forms a passage 5 for inserting and removing a sliding valve body inside the joint body 2, and sealing the passage 5 for inserting and removing a sliding valve body. 6 is formed on the joint body 2.

To form the plug 7, the entire outer circumferential surface of the cylindrical body is lined with an elastic seal 8, a protrusion 7A for preventing removal is provided on the tip side, and a square shaft 7B for rotational operation is provided on the rear end side. When the plug 7 is pulled out and fitted inside, the inlet of the plug fitting part 6 can be closed with the plug 7, and when the plug 7 is inserted into the plug fitting part 6 and rotated to fit tightly, the plug is closed. The fitting part 6 is also sealed with a stopper 7, and the protrusion 7A is engaged with a stepped part 6B of the stopper fitting part 6 to prevent the stopper 7 from coming off.

A cap 14 that seals the entrance of the plug fitting part 6 when the plug 7 is inserted is screwed to the plug fitting part 6, and a plug passage hole 14A through which the plug 7 is passed is formed in the cap 14. can be sealed with a lid 19.

Next, a construction method using the above joints and tools will be explained.

(1) As shown in Figures 1 and 2, the joint body 2
is attached to the main pipe P using the holding connecting portions 2A, 2B, tightening bolts, and nuts 10. In addition, the shutter device 13 and the punching machine 16 are attached to the joint body 2, and the plug 7 is used to insert and remove the sliding valve body into the passage 5.
Insert it into the plug passage hole 14A of the cap 14 and the plug fitting part 6 without inserting it into the hole, and insert the entrance of the passage 1 into the punching machine 1.
At step 8, the entrance 5A of the sliding valve body insertion/removal passage 5 is sealed with the shutter device 13, and the entrance of the plug fitting portion 6 is sealed with the plug 7 in the pulled out state.

(2) Insert the blade of the drilling machine 16 into the passage 1 and form the branch port 17 in the main pipe P with the blade. At this time, the O-ring 9 is used to seal between the joint body 2 and the main pipe P.

(3) With the passage 1 closed by the drilling machine 16,
The blade is pulled out, the sliding valve body 4 is inserted into the passage 1 from the sliding valve body insertion/removal passage 5, and the passage 1 is blocked by the sliding valve body 4.

(4) As shown in FIG. 4, remove the punch 16 from the joint body 2, connect the branch pipe 17 to the passage 1, and connect it to the joint body 2.

(5) Open the passage 1 by pulling out the sliding valve body 4 from the passage 5 for inserting and removing the sliding valve body, and then insert the plug 7 into the plug fitting part 6 and rotate it to make it fit tightly, and then slide The valve body insertion/removal passage 5 and the plug fitting part 6 are closed with the plug 7, and the projection 7A is locked to the stepped part 6B, so that the plug 7 is closed.
After that, the stopper passage hole 14A is closed with the lid 19.

(6) Remove the shutter device 13 from the joint body 2 and attach the flange 3 as shown in FIGS. 3 and 4.
Attach the lid 15 to B to prevent leakage from the joint.

[Another example]

Next, another embodiment will be described.

The circumferential surface of the stopper 7 may be formed into a tapered surface to ensure reliable shutoff regardless of manufacturing errors.

The joint body 2 may be attached to the main pipe P by welding.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention,
Figure 1 is a cross-sectional view of the shutter device and drilling machine installed, Figure 2 is a cross-sectional view of Figure 1, Figure 3 is a cross-sectional view of completed construction, and Figure 4 is of Figure 3. A line sectional view, FIG. 5 is a sectional view of the plug attachment part. FIGS. 6A and 6B show a conventional example, in which A is a cross-sectional view of a state in the middle of construction, and FIG. 6B is a cross-sectional view of a state of completed construction. 1... Passage, 2... Joint body, 4... Sliding valve body, 5... Passage for insertion and removal of sliding valve body, 6... Plug fitting part, 6B... Step part, 7... Plug, 7A...Protrusion, 1
3...Shutter device, 16...Drilling machine, 17...
... Branch port, 18... Branch pipe, P... Main pipe.

Claims (1)

[Claims] 1 The joint body 2 is attached to the main pipe P, and the entrance of the passage 1 of the joint body 2 is closed by the perforator 16 attached to the joint body 2, and the sliding valve of the joint body 2 is closed. With the entrance of the body insertion/removal passage 5 closed by the shutter device 13 attached to the joint body 2, insert the blade of the punching machine 16 into the passage 1, and use the blade to close the main pipe P. Junction 17
, pull out the blade from the passage 1, insert the sliding valve body 4 of the shutter device 13 into the passage 1 from the sliding valve body insertion/removal passage 5, and then remove the sliding valve body from the passage 1. 4 to close the passage 1, remove the punch 16 from the joint body 2, and open the branch pipe 18.
is connected to the passage 1 and connected to the joint body 2, the passage 1 is opened by pulling out the sliding valve body 4, the passage 5 for inserting and removing the sliding valve body is closed with a closure, and the shutter device 13 from the joint body 2, the plug 7 serving as the closure is placed in the plug fitting portion 6 of the joint body 2 before the branch port 17 is formed, and the inlet thereof is closed. After the sliding valve body 4 is pulled out from the sliding valve body insertion/removal passage 5 and before the shutter device 13 is removed, the plug 7 is inserted into the plug fitting portion 6. The sliding valve body insertion/removal passage 5 and the plug fitting portion 6 are closed with the plug 7, and the protrusion 7A of the plug 7 is inserted into the stepped portion 6B of the plug fitting portion 6. A non-flow type branching and extraction method in which the stopper 7 is prevented from being removed by engaging with the stopper 7.