JP6513552B2 - Protective bag for water blocking bag - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a protective device for a water blocking bag used in a water blocking device that temporarily shuts off a water pipe at the time of repair or replacement work involving cutting of the water pipe.

  As this type of water blocking device, in recent years, a type in which a water blocking bag is inflated just below an insertion hole perforated in a water pipe has been scattered (see, for example, Patent Document 1).

  In the water stopping device described in Patent Document 1, a water stopping bag including a water stopping bag which is inserted into the water pipe via an insertion hole formed in the water pipe and which is expanded and deformed to close the water pipe A water device, comprising: an upright cylinder detachably connected to a valve in communication with the insertion hole; a slide cylinder formed in the upright cylinder and having a flow passage therein; and a tip end of the slide cylinder And a downward biasing means for pushing and moving the slide cylinder against fluid pressure in the water pipe, and the outer circumferential surface of the water blocking bag, When the water blocking bag is elastically expanded and deformed at positions located on both sides of the slide cylinder, the water blocking bag is pressed against the inner circumferential surface of the water pipe over the entire circumferential direction. An annular seal for friction holding is provided to prevent water Even if the water blocking bag is pressed to move downstream by the fluid pressure from the fluid flowing through the water pipe in the state, the water blocking is caused by the friction between the both annular seal parts and the inner circumferential surface of the water pipe. It is intended to be able to prevent the bag from moving downstream of the water pipe.

Unexamined-Japanese-Patent No. 2015-55287

  However, in the above prior art, the annular seal portion is formed on the inner surface of the insertion hole at a position deviated from the sharp burr formed on the inner peripheral edge of the insertion hole in the inner circumferential surface of the water pipe when drilling the insertion hole. The pressure on the inner peripheral surface of the side peripheral portion fluid pipe makes it possible to prevent a drop in water blocking performance, but the burrs reliably hit the water blocking bag in the expanded state, and in some cases pierce the water blocking bag deeply. There is an issue that needs to be solved, for example, the danger of the water blocking bag can not be denied.

In view of the problem that the burrs of the insertion hole of the tube directly hit the water blocking bag in the expanded state based on the above-mentioned prior art, the present invention is an upper portion smaller in diameter than the insertion hole of the water blocking bag formed in the tube A lower portion having a large diameter and a central hole through which the mouthpiece of the water blocking bag is inserted, and the lower portion is a protector which is elastically deformable so as to be able to pass through the insertion hole. water stop mounted Shi fitted to the base of the bag, and returns to its original shape after under passes through the insertion hole lower portion of the guard in the insertion process of the waterproofing bag is deformed, the lower portion is the By concealing the inner peripheral side peripheral portion in the insertion hole of the tubular body, the water blocking bag in the expanded state is brought into close contact with the lower portion so as not to hit the burr, thereby solving the above problem.

In short, the present invention has a ring shape having an upper portion smaller in diameter than the insertion hole of the water blocking bag formed in the tubular body, a lower portion having a large diameter, and a central hole through which the mouthpiece of the water blocking bag is inserted. Since the lower portion is elastically deformable so as to pass through the insertion hole, the lower portion of the protector attached to the mouth ring can pass through the insertion hole in the process of inserting the water blocking bag. Since the lower portion can hide the inner peripheral edge portion of the insertion hole of the tubular body because the lower portion can return to the original shape reliably after passing through the insertion hole even when deformed, the expanded state The water blocking bag of the present invention can be in close contact with the lower portion so as not to hit the burrs, thereby reliably preventing the water blocking bag from exploding.

  Furthermore, since the pair of half ring members can be divided, the two half ring members can be attached so as to sandwich the base, so that the protector can be attached regardless of the shape of the base, etc. The practical effect is huge.

It is a top view of the protector for water stop bags concerning the present invention. It is a front view of FIG. It is a front view which shows the state which attached the water blocking bag which attached the protector of FIG. 1 to the slide cylinder. It is sectional drawing which shows the use condition of the protector of FIG.

The protective device for water blocking bag 1 according to the present invention is an elastically deformable ring body, and as shown in FIGS. 3 and 4, in the case of repair or replacement work involving cutting of the pipe body P, the inside of the pipe body P is temporarily fitted on attached to the base B of the water stopping bag a in blocking device S for blocking the, basically, a smaller diameter upper part 2 from the insertion hole H formed in the tube P, a larger diameter lower portion 3 When the protective tool 1 is pushed from above into the insertion hole H from below, the lower part 3 is deformed to allow the insertion hole H to pass through, and the original after the passage It is possible to return to the shape.

  As shown in FIGS. 1 and 2, the protector 1 is integrally connected by bolts 5 and 5a through which two half ring members 1a and 1b are penetrated. , 6a, bolt holes 7 and 7a are formed on the other side, the bolt 5 is inserted into the counterbore hole 6 of one half ring member 1a and the bolt hole 7a of the other half ring member 1b, and the other half ring A bolt 5a is inserted and screwed into a counterbore hole 6a of the member 1b and a bolt hole 7 of one half ring member 1a to integrate the two half ring members 1a and 1b into a protector 1.

Next, the blocking device S using the water blocking bag A to which the protective tool 1 is attached will be described based on FIG.
The shutoff device S mainly includes a saddle ball valve C attached to a pipe P to be constructed and an insertion machine D of a water blocking bag A connected to the ball valve C.
In addition, the penetration hole H of the water blocking bag A of a contracted state is opened by the drilling machine which was once attached to the ball valve C at the side location corresponding to the ball valve C of the pipe body P. FIG.

  The insertion machine D comprises an upright pipe E connected to a ball valve C, and a slide pipe F inserted into the upright pipe E, and the water blocking bag A in a contracted state is connected to the lower end of the slide pipe F There is.

Then, in the insertion completed state of the slide tube F, the protector 1 is pushed from above the insertion hole H in the insertion process, and the lower portion 3 is deformed and returns to the original shape after passing through the insertion hole H The lower part 3 hides the inner peripheral edge of the insertion hole H of the pipe body P, and the water blocking bag A in a contracted state is introduced into the pipe body P through the insertion hole H and disposed directly below the insertion hole H .
Next, air is fed into the water blocking bag A from the air pump (not shown) through the slide pipe F to inflate the water blocking bag A.
By this expansion, the water blocking bag A is in close contact with the inner peripheral surface of the tubular body P and pressed against it, thereby blocking the flow of the fluid in the tube to the secondary side or downstream side. Since the water blocking bag A is in close contact with the inner circumferential surface and the water blocking bag A is in close contact with the lower portion 3, the burr G does not pierce the water blocking bag A.

1 Protective gear
1a, 1b Half ring member 2 upper part 3 lower part 4 central hole A water blocking bag B mouthpiece H insertion hole P tube S blocking device

Claims (2)

A protective tool externally fitted to a base of a water blocking bag of a blocking device for temporarily blocking the inside of a pipe body during repair or replacement work involving cutting of the pipe body,
It is formed in a ring shape having an upper part smaller in diameter than the insertion hole of the water blocking bag formed in the tubular body, a lower part larger in diameter, and a central hole through which the mouthpiece of the water blocking bag is inserted. The lower portion is elastically deformable so as to be able to pass through the insertion hole.   The water bag protective device according to claim 1, characterized in that it can be divided into a pair of half ring members.

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