JP2017082879A - Water stop device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cause water stop bag insertion means and fixing means of water stop bag to a water service pipe to be the same to each other.SOLUTION: A water stop bag 4 is installed at a lower end opening part of a slide pipe 8 and a branch block 10 arranged on a union nut 7 under an insertion completed state into an upright pipe 6 is installed at an upper end, an upper end part of the slide pipe 8 is helically inserted and fixed to a lower end opening part of a vertical hole 11 of the branch block 10, a lateral hole 12 communicated with the vertical hole 11 is provided with a connecting port 13, a depressing stay 5 passes through the vertical hole 11 of the branch block and the slide pipe 8 in such a manner as it may be moved up and down, a location in the slide pipe 8 is formed with an air inlet 20, a location in the water stop bag 4 is formed with an air outlet 21, and an insertion machine 2 is provided with means for lower biasing the depressing stay 5. Since it becomes possible to depress down the slide pipe 8 and the depressing stay 5 separately, the depressing force of the depressing stay 5 can be set and even if the depressing stay 5 is stopped, it is possible to depress the slide pipe 8 and the entire water stop bag 4 can be stored completely within a water service pipe P.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water stop device that temporarily shuts off a water pipe during repair or replacement work involving cutting of the water pipe.

  As this type of water stop device, in recent years, a type in which a water stop bag is inflated just below an insertion hole drilled in a water pipe has come to be seen (for example, see Patent Documents 1 and 2). .

  In the water stop device described in Patent Document 1, the water stop device is provided with a water stop bag that is inserted into the water pipe through an insertion hole formed in the water pipe and expands and deforms to close the water pipe. A water device, an upright cylinder that is detachably connected to a valve that communicates with the insertion hole, a slide cylinder that is provided in the upright cylinder and that has a flow passage therein, and a tip portion of the slide cylinder The water-stopping bag that is elastically inflatable and deformable, and a downward urging means that pushes and moves the slide cylinder against the fluid pressure in the water pipe, on the outer peripheral surface of the water-stopping bag, When the water-stopping bag is elastically expanded and deformed, the water-stopping bag is placed in contact with the inner peripheral surface of the water pipe over the entire circumference in the circumferential direction at locations located on both sides of the slide cylinder. An annular seal that holds friction is projected, Even if the water stop bag is pressed so as to move downstream by the fluid pressure from the fluid flowing through the water pipe in the state, the water stoppage is caused by the friction between the two annular seal portions and the inner peripheral surface of the water pipe. The bag can be prevented from moving to the downstream side of the water pipe.

  However, since the annular seal portion is provided on the water stop bag side regardless of an upright tube or a slide tube fixed to the water pipe, the water stop bag does not resist fluid pressure and is downstream. The danger of moving to the side cannot be denied.

  Further, in the water stop device described in Patent Document 2, the water stop device is provided with an insertion machine that is inserted into the water pipe through an insertion hole drilled in the water pipe and blocks the water flow. A water stop bag is attached to the front end side of the machine, and seals between the base and the insertion hole on the outer periphery of the base of the water stop bag facing the insertion hole when the insertion machine is shut off; and A sealing and fixing member for fixing the insertion machine in the insertion hole is mounted, and the tip of the water-stopping bag inserted through the insertion hole and in contact with the inner surface of the water pipe is connected to the inner surface of the water pipe. Fixing means for fixing the front end side of the water stop bag is provided, and the insertion machine is in two places, a part of the water pipe insertion hole and a part of the water stop bag opposite to the insertion hole. Fluid that flows through the water pipe in the water-stopping bag because it is fixed and does not move Even when pressure is applied, the insertion machine does not tilt and can be supported and fixed in a normal state, so there is no gap between the outer surface of the base of the water-stopping bag and the edge of the insertion hole. In this way, the leakage of the fluid on the side to the downstream side can be completely prevented.

Japanese Patent Laying-Open No. 2015-55287 JP 2013-200025 A

However, in the invention described in Patent Document 2, the following means (1) to (3) are solved because the means for inserting the water stop bag and the means for fixing the water stop bag to the water pipe are the same. There was a problem that had to be done.
(1) When the water pipe is cut after stopping the water with the water stop bag, the shaft 28 in the inserter (breaker 20) is specifically connected to the water stop bag and the inserter fixing the water stop bag. Since the force generated by the pressure due to the fluid acts on the portion fixed to the drive shaft 44, the possibility of damaging the acting surface of the pressing force by the shaft 28 on the inner surface of the water stop bag and the water pipe cannot be denied.
(2) Since the pressing force is obtained by pushing down the entire insertion machine, the possibility of applying an excessive pressing force to the water pipe side cannot be denied.
(3) For example, when a convex portion is formed on the inner surface of a water pipe due to scale adhesion or the like, the possibility of failure of inserting a water stop bag cannot be denied.

  In view of the above problems (1) to (3), the present invention provides a ball valve with a saddle attached to a water pipe, an inserter connected to the ball valve, and a lower end of the inserter. A water stop bag mounted on the ball valve and a hollow pressing stay penetrating the ball valve and the insertion machine and having a lower end positioned in the water stop bag. The insertion machine is connected to the ball valve. And a slide tube that is inserted in a watertight manner into a union nut screwed in a watertight manner to the upper end opening of the upright tube, and the slide tube is inserted into the water stop in the lower end opening. A bag is attached, and a branch block is provided on the upper end of the union nut in a state where insertion into the upright pipe is completed, and the upper end of the slide tube is inserted into a lower end opening of a vertical hole formed through the branch block. Screwing A connecting port is provided in the opening of the horizontal hole that is in communication with the vertical hole, and the pressing stay penetrates the vertical hole of the branch block and the slide tube so as to be movable up and down, and an air inlet is provided in a portion in the slide tube. By forming an air outlet at a site in the water stop bag and providing the insertion machine with a downward biasing means for the pressure stay, it is necessary to push down only the pressure stay without pushing down the entire insertion machine. The pressing force can be set and the slide tube can be pushed down even when the pressing stay stops, and the entire water-stopping bag can be completely accommodated in the water pipe, thereby solving the problems (1) to (3).

  In short, the present invention includes a ball valve with a saddle attached to a water pipe, an inserter connected to the ball valve, a water stop bag attached to a lower end of the inserter, the ball valve and the inside of the inserter. Since the lower end is composed of a hollow pressing stay located in the water stop bag, the set of the water stop bag is an inserter, and the water stop bag is fixed to the water pipe with respect to the inserter. Since each can be performed with a free pressing stay, the entire water-stopping bag can be completely accommodated in the water pipe without applying an excessive pressing force to the water pipe side, so that it can be stopped according to the situation at the site. Water work can be performed.

The insertion machine is composed of an upright pipe connected to the ball valve, and a slide pipe that is inserted in a watertight manner into a union nut screwed in a watertight manner to an upper end opening of the upright pipe, and is slidably inserted through the slide. The pipe is provided with the water stop bag at a lower end opening, and provided with a branch block disposed on the union nut in a state of completion of insertion into the upright pipe at the upper end, and a lower end of a vertical hole formed vertically through the branch block. The upper end of the slide tube is screwed and fixed to the opening, and a connection port is provided in the opening of the horizontal hole communicating with the vertical hole. The pressing stay can move the vertical hole of the branch block and the slide tube up and down. Since an air inlet is formed in a portion in the slide tube and an air outlet is formed in a portion in the water stop bag, the slide tube is formed in the upright tube, and the pressing stay is formed in the axial direction with respect to the slide tube. Move Since it is possible to ability, the work of inserting the water pipe of the Oyobi waterstop bag installation work of the ball valve of the insertion machine reliably and easily performed, it is possible.
Furthermore, even if the pressure stay can move in the axial direction with respect to the slide tube, the air fed from the connection port can be reliably passed through the horizontal and vertical holes of the branch block, the slide tube, the air inlet, the inside of the pressure stay, and the air outlet. Can be sent into a water-stop bag.

  Since the downward biasing means of the pressing stay is provided in the insertion machine, the practical effect such as being able to continue to act on the water pipe with the minimum pressing force capable of fixing the water stop bag is significant.

1 is a cross-sectional view of a water stop device according to the present invention. It is a principal part enlarged view of the upper part of FIG. It is a principal part enlarged view of the lower part of FIG.

In the water stop device 1 according to the present invention, basically, a ball valve 2 with a saddle attached to a water pipe P to be constructed exposed by excavation, an inserter 3 connected to the ball valve 2, The water stop bag 4 attached to the lower end of the insertion machine 3 and the pressure stay 5 penetrating the ball valve 2 and the insertion machine 3 and having the lower end positioned in the water stop bag 4 are configured.
In addition, in the side surface location corresponding to the ball valve 2 of the water pipe P, an insertion hole H at the time of contraction of the water stop bag 4 is opened by a punching machine (not shown) once attached to the ball valve 2.

  The insertion machine 3 includes an upright pipe 6 connected to the ball valve 2 and a slide pipe 8 that is inserted in a watertight manner into a union nut 7 screwed in a watertight manner to the upper end opening of the upright pipe 6 so as to be movable up and down. .

  The slide tube 8 is provided with a water blocking bag 4 in a contracted state via a connector 9 at the lower end opening, and provided with a branch block 10 disposed on the union nut 7 in a state of being inserted into the upright tube 6 at the upper end. The upper end portion of the slide tube 8 is screwed and fixed to the lower end opening portion of the vertical hole 11 formed vertically through the branch block 10, and the connection port 13 with a pressure gauge is provided at the opening portion of the horizontal hole 12 in communication with the vertical hole 11. The pressure gauge connecting port 13 is connected to an air pump (not shown).

  The connecting tool 9 has an insertion countersink 14 for the slide tube 7 formed on the upper surface, a mounting recess 15 for the water stop bag 4 formed on the lower surface, and an insertion hole 16 for the pressing stay 5 formed vertically through the center.

  The waterstop bag 4 has a bag body 17 that can be expanded and contracted, and a base 18 that is connected to the mounting recess 15 of the connector 9.

  The pressing stay 5 is a metal pipe and penetrates the vertical hole 11 of the branch block 10, the slide tube 8, the insertion hole 16 of the connector 9, and the base 18 of the water stop bag 4 so as to move up and down, and a pressing plate 19 at the lower end. The air inlet 20 is formed at a site in the slide tube 8, and the air outlet 21 is formed at a site in the water stop bag 4.

  In addition, an O-ring is provided between the vertical hole 11 of the branch block 10 and the pressing stay 5, and the insertion hole 16 of the connector 9 is partially reduced in diameter so as to be in close contact with the pressing stay 5 to ensure watertightness and airtightness. Yes.

  The insertion machine 3 is provided with a downward biasing means for the pressing stay 5, the downward biasing means is a chain lever hoist 22, and the upper hook 23 of the chain lever hoist 22 is horizontally projected at the upper protruding end of the pressing stay 5. The lower hook 25 is hung on the locking body 24 on the lower locking body 26 horizontally projecting from the lower end side of the upright pipe 6, and the space between the upper locking body 24 and the lower locking body 26 is narrowed by operating the lever. Thus, the pressing stay 5 can be moved downward relative to the upright pipe 6.

  Further, a screw thread is formed on the outer periphery of the front end of the cap 18 of the water stop bag 4 and a thread groove is formed on the inner periphery of the mounting recess 15 of the connector 9, and a nut 27 screwed into the cap 18 is tightened to tighten the connector 9. The closeness of the water-stopping bag 4 with respect to the connector 9 is improved.

Next, the attachment process of the water stop apparatus which concerns on this invention is demonstrated.
First, the pressing stay 5 is pushed down with respect to the slide tube 8, the pressing plate 19 of the pressing stay 5 is applied to the contracted water-stopping bag 4, and the water-stopping bag 4 is extended, and the slide tube 8 in this state is erected. The water-stopping bag 4 in the contracted state is accommodated in the upright pipe 6 by being pulled up with respect to the pipe 6.

  Next, after connecting the upright pipe 6 in this state to the ball valve 2, the ball valve 2 is opened, and the slide pipe 8 and the pressing stay 5 are pushed down, and the water-stopping bag 4 in the contracted state is inserted into the insertion hole H. After passing, the tip stays against the inner surface of the water pipe P and the pressing stay 5 stops. Further, the slide pipe 8 is pushed down until the branch block 10 hits the union nut 7 of the upright pipe 6.

  After that, the chain lever hoist 22 is set on the upright pipe 6 and the lever is operated to press the water stop bag 4 toward the water pipe P side, thereby fixing the water stop bag 4 to the water pipe P and connecting with a pressure gauge. By an air pump (not shown) connected to the port 13, the air that has flowed into the slide tube 8 is sent from the air inlet 20 into the pressing stay 5, and is sent from the air outlet 21 into the water stop bag 4. The water-stopping bag 4 is inflated, and the water-stopping bag 4 is brought into close contact with the inner wall of the water pipe P so as to be in pressure contact therewith, thereby shutting off water flow to the downstream side.

  The water stop bag 4 is strongly pressed downstream of the water pipe P by the water pressure increased by the water stop, but the water stop bag 4 is sandwiched between the pressing plate 19 of the press stay 5 and the inner surface of the water pipe P. As a result, the frictional resistance against the inner surface of the water pipe P is increased, and although there is some deformation, it is possible to stop in place while maintaining the blocking function.

  Further, when the water pressure is applied to the water stop bag 4, the pressure is applied to the contact surface between the union nut 7 at the upper end of the upright pipe 6 and the branch block 10 at the upper end of the slide pipe 7. Hard to damage.

  In the above-described embodiment, the chain lever hoist 22 is cited as the optimal downward biasing means. However, for example, a turn buckle or the like may be used as long as the pressing stay 5 can be moved downward and the state can be maintained. Further, a load meter may be attached to the downward urging means, and the load on the pressing stay 5 may be digitized so as to be confirmed.

2 Ball valve with saddle 3 Inserting machine 4 Water stop bag 5 Press stay 6 Upright pipe 7 Union nut 8 Slide pipe
10 branch block
11 Vertical hole
12 Horizontal hole
13 Connecting port
20 Air inlet
21 Air outlet P Water pipe

Claims (1)

A ball valve with a saddle attached to a water pipe, an insertion machine connected to the ball valve, a water stop bag attached to a lower end of the insertion machine, and a lower end penetrating through the ball valve and the insertion machine Consists of a hollow press stay located in the water stop bag,
The insertion machine is composed of an upright pipe connected to the ball valve, and a slide pipe which is inserted in a watertight manner into a union nut screwed in a watertight manner to the upper end opening of the upright pipe,
The slide tube is provided with the water stop bag at a lower end opening, and provided with a branch block arranged on the union nut in a state where the upper end is inserted into the upright tube, and a vertical hole formed vertically through the branch block. The upper end portion of the slide tube is screwed and fixed to the lower end opening portion, and a connection port is provided at the opening portion of the horizontal hole in communication with the vertical hole.
The pressing stay penetrates the vertical hole of the branch block, the slide tube so as to be movable up and down, forms an air inlet at a portion in the slide tube, and forms an air outlet at a portion in the water stop bag,
An air bag for a shut-off device, wherein the insertion device is provided with a downward biasing means for the pressing stay.

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