JPH04194491A - Water stopping method for pipe line in water non-interruption construction method - Google Patents

Abstract

PURPOSE:To make an insertion hole for inserting a stopper valve into a pipe small so as to usefully ensure pipe line strength at the time of execution by using the stopper valve formed by constituting a valve unit of a bag-shaped body inflated after insertion into the pipe line. CONSTITUTION:A work chamber 40 is formed by mounting the first chamber forming unit 34 to a housing 26 of a gate valve 24. An insertion hole 36 for inserting a stopper valve 46 into a pipe in a pipe wall by a jet water stream, jetted from an injection nozzle 42 provided in the inside of this work chamber, is formed. In the stopper valve 46, a hollow circular annular bag-shaped body 56, formed of rubber elastic material, is mounted to an end part peripheral surface of a center core unit 54 to supply/discharge fluid to/from a closed chamber 60 in the body 56. The stopper valve 46, after it is mounted, is inserted into the inside of a distribution water pipe 16 through the insertion hole 36 by a handle 50. Next by supplying predetermined pressure fluid to the stopper valve 46, after the center core unit 54 is protrusively moved, the bag-shaped body 56 is inflated deformed to come into close contact relating to an internal peripheral surface of the distribution water pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method of installing a water stop valve in a pipe to close the pipe without interrupting the water supply, and in particular, the present invention relates to a method of installing a water stop valve in a pipe to close the pipe without interrupting the water supply. The present invention relates to a method for shutting off water in pipes using an uninterrupted water construction method that is easy and can achieve a high water shutoff effect.

(Background technology) In recent years, when repairing, replacing, or renovating pipes, water is stopped by installing a water stop valve in the existing pipe without interrupting the water flowing through the pipe. in a state of
BACKGROUND ART The uninterrupted water construction method for carrying out necessary construction work has been attracting a lot of attention as social life has become more complex and faster.

By the way, as a water stoppage method for a pipeline in such a water-stop construction method, as shown in FIG. 9(a), a split T-shaped pipe 4 is attached to the outer periphery of the pipeline 2. A sealable working chamber 8 whose interior can be liquid-tightly partitioned off by a gate valve 6 is formed on the outer circumferential portion of the pipe line 2, and a hole saw 10 housed in the working chamber 8 is used to cut the pipe line 2. After drilling an insertion hole 12 of a size extending approximately half the circumference in the pipe wall, the hole saw 10 is used as an elastic water stop valve while the working chamber 8 is partitioned off with the gate valve 6. Valve body 14
As shown in FIG. 9(b), the elastic valve body 14 is inserted into the conduit 2 through the insertion hole 12 and brought into pressure contact with the inner peripheral surface of the conduit 2. A construction method for water-stopping the pipe line 2 is generally being adopted.

However, in such a construction method, the elastic valve body, 14
Since the insertion hole 12 for inserting the cough tube into the pipe 2 must be formed with a size that covers approximately half the circumference of the cough pipe 2, the cross-sectional area of the pipe becomes small and the pipe strength is significantly reduced. Therefore, during construction,
It is necessary to perform reinforcement work such as covering the pipe with concrete, which poses a problem in that the work is troublesome and time-consuming.

Furthermore, the inner surface of the pipe line 2 is usually not a perfect circle due to deformation of the pipe body during manufacture, adhesion of rust or contaminants to the pipe body, or uneven coating of the pipe body. In order to close the pipe line 2, it is necessary to forcefully press the elastic valve body 14 against the inner circumferential surface of the pipe line 2. They also had the problem of being susceptible to deformation and breakage due to large stress being induced.

Furthermore, in such a water stop method, in addition to the fact that it is difficult to close the insertion hole 12 provided in the conduit 2,
There is also a problem in that the elastic valve body 14 is easily damaged by burrs or the like at the cut end of the insertion hole 12.

Also, JP-A-60-143291 and JP-A-1-1
Publication No. 50086 discloses that the elastic valve body 1 is used as a water stop valve.
Instead of method 4, a method of shutting off water in a pipeline using a butterfly valve has been proposed. In other words, the butterfly valve is used as a water stop valve.
By using a valve, the insertion hole formed in the pipe wall for inserting the valve body can be made into a relatively small elongated shape extending in the pipe axis direction with a width that does not reach half the circumference of the pipe. In addition, the amount of cutting waste mixed into the water flowing through the pipe can be reduced, and the reduction in pipe strength can also be effectively reduced.

However, even with such a water stopping method using a butterfly valve, it is not possible to effectively deal with the inner circumferential surface of a pipe that is not a perfect circle. The problem was that the driving device was seriously damaged and the pipe line was easily deformed and damaged, and the insertion hole provided in the pipe line had to be closed. In addition to being difficult, butterflies and
It also had the disadvantage that the valves were easily damaged.

(Problem to be solved) Here, the present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is:
The insertion hole formed in the wall of the pipe can be small, and the strength of the pipe body during construction can be advantageously ensured, and damage to the valve body due to contact with the cut of the insertion hole can be effectively prevented. To provide a water shutoff technique for a pipe in a non-water cutoff construction method, in which a valve body can be easily brought into close contact with the inner four circumferential surfaces of a pipe that is not a perfect circle, and an excellent water cutoff effect can be obtained. It is in.

(Solution Means) In order to solve this problem, the present invention is characterized in that the water flowing through the pipe is not cut off (a water stop valve is installed in the pipe). A method for stopping water in a pipeline in the non-water-stopping construction method, comprising: (a)
(b) forming a sealable working chamber in the outer circumference of the pipe; (C) A hollow ring-shaped bag made of a flexible member is integrally attached around the central core body, and the bag-like body providing a stopper valve as the water stop valve, which allows the cough pouch to be inflated outwardly by supplying fluid into the interior of the cough pouch;
(d,,) inserting the stopper/valve into the conduit from the working chamber through the insertion hole, and further moving the stopper/valve a predetermined distance in the axial direction of the tube, thereby forming the bag-shaped (e) supporting the stopper valve at a location where the body is positioned in the conduit away from the region where the insertion hole is formed; The method includes the step of supplying fluid to the inside of the body and inflating the bag-like body to bring the bag-like body into close contact with the inner circumferential surface of the pipe.

Further, in the present invention, when water-stopping a pipe line according to such a process, the central core constituting the valve body of the stopper valve is attached to a predetermined housing member at one end in the axial direction. The central core body is fitted with a piston structure so that the bag-like body is positioned outside the housing member and is supported through the housing member, and the central core body is attached in a direction in which the central core body is accommodated in the housing member. The stopper valve in the conduit is provided with biasing means for biasing the stopper valve in the conduit, and is configured to supply fluid to the interior of the bag-like body through a cylinder chamber formed in the housing member. is moved in the tube axis direction by causing the central core to protrude from the housing member based on the pressure of the fluid exerted in the cylinder chamber when fluid is supplied to the inside of the bag-like body. Another feature of this invention is the method of shutting off water in pipes using the non-water cutoff construction method.

(Operation/Effect) That is, according to the method of the present invention, by using a stopper valve whose valve body is made of a bag-like body that is inflated after being inserted into a pipe, the stopper valve is - The insertion hole for inserting the valve into the pipe can be small, and the strength of the pipe can be advantageously ensured during construction.

Further, the stopper valve is moved in the axial direction of the pipe after insertion into the pipe, so that the inflated bag-like body is brought into close contact with the part where the insertion hole is not formed. Therefore, damage to the valve due to contact with the cut end of the insertion hole can be completely prevented, and there is no need to cover the insertion hole, so it is advantageous to simplify the water stop structure. It can be done.

Furthermore, according to the method of the present invention, the bag-like body made of a flexible member can be advantageously brought into close contact with the inner circumferential surface of a conduit that is not a perfect circle, so that an excellent water-stopping effect can be stably achieved. You can get it.

According to the method of the present invention as set forth in claim (2), the stopper valve has a structure in which the central core constituting the stopper valve is fitted into a predetermined housing member in a piston structure. The movement of the stopper/valve in the pipe axial direction after insertion into the pipe causes the stopper/valve to move in the pipe axis direction.
When fluid is supplied to the bag-like body constituting the valve, the pressure of the fluid is exerted inside the cylinder chamber, causing the central core to protrude from the housing member. The drive mechanism can be extremely simplified, and operations during construction can be automated, making work easier and reducing labor more advantageously.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

In Figure 1, 16 is a distribution pipe (pipe line) through which water is allowed to flow, which is to be stopped in the non-stop water construction method, and is usually constructed of cast iron pipes, asbestos pipes, steel pipes, etc. It is something. First, a split T-shaped pipe 18 is attached to the outer periphery of the water pipe 16 where the water should be stopped, and the split T-shaped pipe 18 is attached integrally and watertightly by welding or the like, and further,
The housing 26 of the gate valve 24 is attached to the flange portion of the branch port 20 of the split T-shaped pipe 18 in a watertight manner.

This gate valve 24 includes a valve body 28 and a handle 30 for moving it.
The opening of the branch port 20 in the split T-tube 18 can be closed watertightly.

Further, a bypass flow path 29 is provided spanning between the branch port 20 of the split T-shaped pipe 18 and the housing 26 of the gate valve 24. Both sides of 28 can communicate with each other. Furthermore, a gate valve 31 is disposed on the bypass flow path 29, so that the bypass flow path 29 can be opened/closed as appropriate.

Next, the first chamber forming body 34 is watertightly attached to the outer flange portion of the housing 26 of the gate valve 24 to close the opening of the housing 26. The first chamber forming body 34 is provided with a discharge port 38 for discharging chips and leaked water generated during formation of the insertion hole 36, which will be described later. That is, the split T-shaped pipe 1 attached to the outer periphery of the water pipe 16 in this way
By liquid-tightly covering the inside of the branch port 20 of No. 8 and the housing 26 of the gate valve 24 attached to the branch port 20 with the first chamber forming body 34, a working chamber 40 is formed there. This is because the inside of the working chamber 40 is partitioned off by the valve body 28 of the gate valve 24. Note that the two side chambers separated by the gate valve 28 are connected to the bypass flow path 2.
By making the internal pressures between these compartments the same, the gate valve 28 can be opened and closed smoothly.

Furthermore, an injection nozzle 42 of a high-pressure water jet device is disposed inside the first chamber forming body 34, and is brought close to the surface of the water pipe 16 when the gate valve 24 is open. A drive means (not shown) drives the
The water pipe 16 can be moved along the inner circumferential surface of the chamber forming body 34 . Then, by injecting a high-pressure jet water stream mixed with a predetermined abrasive material supplied through the flexible tube 44 onto the outer surface of the water pipe 16, the water pipe 16 is
6 is cut off. The means for cutting the water pipe 16 using such a high-pressure water jet device is a known method, and is disclosed in the above-mentioned Japanese Patent Laid-Open No. 1-15
Since it is also disclosed in Publication No. 0086 and the like, a detailed explanation thereof will be omitted here.

Then, by cutting the pipe wall of the water distribution pipe 16 by the jet water stream ejected from the injection nozzle 42 of such a high-pressure water jet device, a stopper valve 46, which will be described later, is inserted into the pipe against the pipe wall. An insertion hole 36 is formed for this purpose (see FIG. 2).

Next, after forming the insertion hole 36, the injection nozzle 42 is pulled up into the first chamber forming body 34, and the gate valve 24 is pulled up.
With the working chamber 40 liquid-tightly partitioned by the valve body, the first chamber forming body is removed and replaced with an outer flange on the housing 26 of the gate valve 24, as shown in FIG. A second chamber forming body 48 is watertightly attached to the housing 26 to close the opening of the housing 26. That is, by attaching this second chamber forming body 48, similar to when attaching the first chamber forming body 34,
Since the branch port 20 of the split T-shaped pipe 18 and the inside of the housing 26 of the gate valve 24 attached to the branch port 20 are covered in a liquid-tight manner, a ``working chamber 49'' is formed therein. There is a gate valve 2 in the working chamber 49.
It is partitioned off by a valve body 28 at 4. Note that even when the second chamber forming body 48 is installed, the two chambers separated by the gate valve 24 can communicate with each other through the bypass passage 29.
By making the internal pressures between these compartments the same, the gate valve 28 can be driven smoothly.

Further, a hollow rod-shaped feed handle 50 is rotatably supported by the lid of the second chamber forming body 48, and a spindle 52 is inserted into the inside of the feed handle 50. The spindle 52 is engaged with a screw groove, and by rotating the feed handle 50, the spindle 52 can be moved toward or away from the water pipe 16. A stopper valve 46 is attached to the tip of the spindle 52, so that the stopper pulp 46 is supported within the working chamber 49 by the spindle 52.

Here, such a stopper valve 46 has a rod-shaped central core 54, as shown in FIG. 3(a).
A hollow annular bag-like body 56 formed of a rubber elastic body is attached to the outer peripheral surface of one end in the axial direction by a stop bell 1-58. body 56
It has a structure in which a sealed chamber 60 is formed inside. A through hole 62 opening into the second sealed chamber 60 is formed passing through the interior of the central core body 54 in the axial direction.
Fluid can be supplied and discharged into the sealed chamber 60 through the through hole 62.

Further, a piston portion 64 is formed at the other end in the axial direction of the central core body 54.
4, the central core body 54 is fitted into the hollow housing 66, so that the central core body 54 is axially moved with respect to the housing 66 with the portion to which the bag-like body 56 is attached protruding outside. It is movably assembled with a piston structure. This housing 66 is
By being fixed to the spindle 52 , the central core 54 is supported via the housing 66 to the spindle 52 and thus to the second chamber-forming body 48 .

Further, a coil spring 68 is housed inside the housing 66, and the elastic force of the coil spring 68 always biases the central core body 54 in the direction of being housed in the housing 66. There is. Also,
Inside the cylinder chamber 70 formed in the housing 66,
A through hole 62 provided in the central core body 54 and communicating with the sealed chamber 60 is opened, and a fluid passage 72 provided through the spindle 52 is opened. The cylinder chamber 7 is supplied through the fluid passage 72 by an externally provided fluid supply/discharge means (not shown).
0, a predetermined pressure fluid such as water is supplied.

That is, in the stopper pulp 46 having such a structure, when no pressure fluid is supplied into the cylinder chamber 70, as shown in FIG. 3(a), the coil spring 68 Based on the biasing force, approximately half of the central core body 54 is accommodated in the housing 66, and by supplying pressure fluid into the cylinder chamber 70, as shown in FIG. 3(b), As shown in FIG. 3(c), the flexible central core 54 is caused to protrude axially from within the howling ring 66 based on the fluid pressure, and as shown in FIG. is introduced into the sealed chamber 60, and the bag-like body 56 is inflated.

After the second chamber forming body 48 supporting the stopper valve 46 having such a structure is watertightly attached to the housing 26 of the gate valve 24, as shown in FIG. By opening the valve 24 and operating the feed handle 50, the stopper valve 46 is inserted into the insertion hole 36 formed in the wall of the water pipe 16.
It is inserted into the water pipe 16 through the water pipe 16 .

By the way, here, the insertion hole 36 formed in the water distribution pipe 16 is sufficiently large enough to allow the stopper valve 46 to be inserted, and in particular, the stopper valve 46 can be inserted by supplying pressure fluid. Since it is constructed with an inflatable valve body and is compact when inserted, the insertion hole 36 can be formed with a size that does not reach half the circumferential direction of the water distribution pipe 16. The reduction in strength of the water pipe 16 due to the drilling of the insertion hole 36 can be advantageously reduced.

Next, after the stopper valve 46 is inserted into the water pipe 16, the spindle 52 is moved to the stopper valve 46 by a fluid supply/discharge means (not shown) such as a pump.
A predetermined pressure fluid is supplied through a fluid passage formed within. That is, as shown in FIG. 5, the center core 54 of the stopper and valve 46 is projected from the housing 66 and moved within the water pipe 16 by a predetermined distance in the pipe axial direction. can be,
Thus, the bag-like body 56 attached to the central core body 54 is positioned within the water pipe 16 outside the area where the insertion hole 36 is formed.

Further, even after the central core body 54 of the stopper valve 46 is moved protrudingly within the water pipe 16, pressure fluid is continued to be supplied to the bag-shaped body 54 of the stopper valve 46.
By introducing such pressure fluid into the bag 56, the bag 56 is expanded and deformed as described above. That is, thereby, as shown in FIG.
The bag-like body 56 in 6 is brought into close contact with the inner circumferential surface of the water distribution pipe 16, so that the inside of the water distribution pipe 16 is partitioned off in a watertight manner at the close-contact portion of the bag-like body 56. That's what happens.

In this way, the attachment of the stopper valve 46 to the water pipe 16 and the operation of shutting off the water in the water pipe 16 by the stopper valve 46 are completed.

Therefore, if such a method is followed, the stopper valve 4
Since the insertion hole 36 for inserting the water pipe 6 into the water distribution pipe 16 can be formed with a small opening area that does not cover half the circumference of the water pipe 160, a decrease in pipe strength can be advantageously suppressed. During construction, there is no need for special reinforcement work, and easy construction and excellent work efficiency can be achieved.

In addition, since the opening area of the insertion hole 36 is small, the amount of cutting debris generated when forming the insertion hole 36 can be reduced, and the problem of mixing of cutting debris into the fluid flowing through the water pipe 16 can be reduced. can also be advantageously reduced.

Furthermore, the valve body of the stopper valve 46 is formed of a bag-like body 56 made of a flexible material (a rubber elastic body in this embodiment), which is advantageous for the inner circumferential shape of the water pipe 16. Since the water pipes 1 are designed to be compatible with
Even if the inner surface of the tube 6 is not a perfect circle or the inner diameter is not accurately measured, it can be advantageously brought into close contact with the inner surface, and an excellent water-stopping effect can be stably obtained. It can be done.

Furthermore, since the bag-shaped body 56 is brought into close contact with the inner circumferential surface of the water pipe 16 with a substantially uniform pressure contact force over the entire circumference, the bag-like body 56 is brought into close contact with the inner circumferential surface of the water pipe 16 with a substantially uniform pressure contact force over the entire circumference. There is no stress concentration, and deformation and damage in the water pipe 16 can be extremely effectively prevented.

In addition, since the bag-like body 56 is positioned outside the area where the insertion hole 36 is formed in the water pipe 16, when the water is stopped, the insertion hole 36
There is no need to close the hole, the structure of the stopper can be advantageously simplified, and the bag-like body 56 can be prevented from coming into contact with the insertion hole 36, and the cut end of the insertion hole 36 can be freed from pars or the like. Damage can also be completely prevented.

In addition, especially in this embodiment, since the insertion hole 36 for the water pipe 16 is formed using a water jet device, the insertion hole 36 can be formed by mechanical cutting using a boat drill, a hole saw, etc. It is possible to form the stopper valve 46 much more easily and quickly than in the case of forming the stopper valve 46, and it can advantageously be formed with a rectangular elongated hole shape corresponding to the shape of the stopper valve 46.

Furthermore, in this embodiment, the central core body 54 is fitted into the housing 66 in a piston structure, and pressurized fluid is introduced into the bag-like body 56 through a cylinder chamber 70 formed in the housing 66. A stopper valve 46 is used which is configured to supply water, and the movement of the stopper valve 46 in the axial direction of the water pipe 16 after insertion into the water distribution pipe 16 causes Since the central core body 54 is driven to protrude from the housing 66 based on the pressure of the fluid supplied to the stopper valve, the drive mechanism of the stopper valve can be extremely simplified. Operations during construction can be automated, making work easier and reducing labor more advantageously.

Next, FIG. 7 shows another structure of a stopper valve that can be suitably used in carrying out the method of the present invention.

That is, in such a stopper valve, a stopper valve having a structure similar to that used in the above embodiment is used.
A pair of valves 46 are attached to the tip of the spindle 52 so as to protrude in opposite directions.

As shown, the pressure fluid supplied through the fluid passage 72 of the spindle 52 causes the central cores 54, 54 in both stopper valves 46, 46 to
After the stopper valves 46, 46 are driven to protrude by a predetermined amount toward opposite sides of the spindle 52, the bag-like bodies 56, 56 of each stopper valve 46, 46 are inflated.

Therefore, if such a stopper valve is used to stop the water in the pipeline, as shown in Figure 8,
Water can be shut off in each of the water pipes 18 at both sides in the axial direction of the insertion hole 36 formed in the water pipe 18.

In addition, water shutoff using a stopper valve having such a structure can be carried out according to the water shutoff method shown in the first embodiment and by the same method and process. Therefore, in FIGS. 7 and 8, the same reference numerals are given to the parts having the same structure as the members and parts shown in the above embodiment, so that the detailed description thereof will be omitted. This will be omitted.

Although specific examples of the present invention have been described in detail above, such specific examples are literally just examples of the present invention, and the present invention is to be interpreted as being limited only to such illustrative specific examples. Not at all.

For example, in the embodiment described above, the stopper valve 46 is used in which the bag-like body 56 is made of a rubber elastic body, but the bag-like body 56 is made of a flexible membrane that does not have elasticity. It is also possible to use a stopper valve consisting of:

Further, in the embodiment described above, the center core body 54 of the stopper valve 46 is fitted into the housing 66 in a piston structure, and the pressure fluid supplied into the cylinder chamber 70 is Although it was designed to be able to move within the water pipe 16, it is of course possible to adopt a mechanical mechanism using gear means or the like as the moving mechanism.

Furthermore, as a cutting means for forming the insertion hole 36 in the water pipe 16, in addition to the illustrated water jet means, a conventionally known drill, hole saw, etc. may be used.

In addition, the method for shutting off water in a pipeline according to the present invention can be advantageously used in a water shutoff construction method in which required construction work is carried out without shutting off the water flowing in the pipeline. For example, It can be advantageously employed in the installation of valves in non-water supply construction methods, the repair of existing pipes, and the installation of branch pipes or bypass pipes to existing pipes.

In addition, although not listed, the present invention can be implemented in embodiments with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such embodiments include: It goes without saying that any of these terms are included within the scope of the present invention as long as they do not depart from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory view showing the process of forming an insertion hole in a water pipe according to the method of the present invention, and FIG. FIG. □ Also, FIG. 3(a) is a vertical cross-sectional view showing a specific example of a stopper/valve suitably used in the method of the present invention, and FIGS. 3(b) and (c) are respectively a longitudinal sectional view of such a stopper/valve. FIG. 3 is a longitudinal cross-sectional view for explaining the operation of the valve. Furthermore, in the fourth session, according to the method of the present invention, the stopper
FIG. 5 is a cross-sectional explanatory view showing a process of inserting a valve into a water distribution pipe, and FIG. FIG. 6 is an explanatory cross-sectional view showing the step of inflating the bag-like body of the stopper valve moved in the water pipe to stop water according to the method of the present invention. Moreover, FIG. 7 is a longitudinal sectional view showing another specific example of a stopper valve suitably used in the method of the present invention, and FIG. 8 is a step in which water is stopped using such a stopper valve. FIG. 6 is a cross-sectional explanatory diagram corresponding to FIG. Furthermore, FIGS. 9(a) and (b) are, respectively,
It is a process explanatory drawing which shows the prior art about the water stop method of the pipeline in a water stoppage construction method. 19: Water pipe 18: Split T-pipe 24: Gate valve 34: First chamber forming body 36: Insertion hole 4o: Working chamber 42: Illusion/slip 46. : Stroke 7 Pa Valve 4
8: Second chamber forming body 50: Feed handle 52 Niji spindle 54: Central core 56: Bag-like body 60: Sealed chamber 62: Through hole 64: Piston part 66: Housing 68: Coil spring "70 Niji cylinder chamber

Claims (2)

[Claims] (1) A method for shutting off water in a pipe in a water cut-off construction method in which a water stop valve is installed in the pipe to stop the water flowing through the pipe without cutting off the water flowing through the pipe, the pipe comprising: a step of forming a sealable working chamber in the outer circumferential region of the pipe, and a cutting means housed and arranged in the working chamber to form a wall of the pipe having a size that does not reach half the circumference of the pipe in the circumferential direction. A hollow annular bag made of a flexible member is integrally attached around the central core, and fluid is supplied to the inside of the bag. preparing a stopper valve, which allows the bag-like body to expand outward, as the water stop valve; and inserting the stopper valve into the conduit from the working chamber through the insertion hole. Furthermore, by moving the stopper valve a predetermined distance in the tube axis direction, the stopper valve is supported at a position where the bag-like body is located in the pipe line away from the position where the insertion hole is formed. Step: After the stopper valve is moved, fluid is supplied to the inside of the bag-like body in the stopper valve to inflate the bag-like body, so that the bag-like body is attached to the inner circumferential surface of the pipe. 1. A method for shutting off water in a pipe in an uninterrupted water construction method, comprising: a step of bringing the pipes into close contact; (2) The central core constituting the valve body of the stopper valve is fitted with a piston structure into a predetermined housing member at one end in the axial direction, so that the bag-like body is attached to the outside of the housing member. in position,
A biasing means is provided for supporting the central core through the housing member and biasing the center core in a direction to accommodate the central core within the housing member, while supplying fluid to the interior of the bag through the housing member. By configuring the stopper valve to move in the tube axis direction within the pipe line through a cylinder chamber formed inside the cylinder chamber, when fluid is supplied to the inside of the bag-shaped body, the stopper valve can be moved in the pipe axis direction within the pipe line. 2. A method for shutting off water in a pipe in a water-stopping construction method according to claim 1, wherein said central core is operated to protrude from said housing member based on the pressure of said fluid exerted on said fluid.