JPH1163364A - Pipe attaching/detaching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop water in a pipe by means of a simple device/equipment by refrigerating one pipe from the outside by means of a refrigerating device so that liquid inside the tube is frozen for stopping water after liquid in the other pipe constituting piping is stopped by means of an opening/closing valve. SOLUTION: For releasing the connection of a connection part 9 between a pipe 2 provided with an opening/closing valve 2a integrally and one pipe 1 among pipes 1, 3 adjacent to the pipe 2, a handle 2b is operated so as to close the opening/closing valve 2a, and the flow of liquid inside a pipe 8 is stopped. Then, a freezer 4 is arranged so as to cover the outside of the pipe 1 connected to the pipe 2. By means of the freezer 4, muddy water inside the pipe 1 is sufficiently frozen so as to be formed into a frozen part 5, and then, the connection of the connection part 9 between the pipe 1 and the pipe 2 provided with the opening/closing valve 2a is released. Subsequently, another pipe is connected newly, while a heating device is arranged in the part in which the frozen part 5 is positioned, and by means of the heating device, the frozen part 5 is thawed, so that the stopping of water in the pipe 1 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction for performing fluid transportation such as a muddy pressurized shield construction method, a method for disassembling pipes in water and sewage systems, and other water circulation systems, and a method for assembling the pipes.

[0002]

2. Description of the Related Art A shield method is known as a technique for digging a tunnel. In the shield method, there is a need for a method of extending piping for muddy water and wastewater by fluid transportation in accordance with the progress of the shield. In order to extend the piping, first, a part of the connection of the piping constituting the flow path is disconnected, and then a newly incorporated pipe is connected. When disconnecting this pipe, it is necessary to stop the water near the pipe to be disconnected to prevent leakage of muddy water present in the pipe.

[0003] Conventionally, the following two methods are mainly used as the water stopping method.
Two methods have been performed. The first method is a method in which a valve is provided in each of all pipes forming a connection portion. In this method, first, the valve of each of two adjacent pipes is closed to stop water, then the connection between the two pipes is disconnected, and then the other pipe is moved to the position where the connection is released. Insert and connect.

[0004] A second method is to send an object for stopping water into a pipe by using a special device / equipment.
For example, a so-called slide ball valve device is used in which a portion between two ends of a Y-shaped pipe forms a part of a pipe serving as a flow path of muddy water, and a ball valve that is a spherical body is provided at another closed end. Method. In the second method using the slide ball valve device, first, an on-off valve provided in the device itself is closed to shut off water in a pipe portion serving as a flow path of the Y-shaped pipe. The adjacent pipe is shut off by feeding it to another pipe adjacent to this device by hydraulic or hydraulic pressure or the like. Thereafter, the connection between the slide ball valve device and the tube adjacent thereto is released, and then a new tube is inserted and connected at the position where the connection has been released.

[0005]

In the first method, an open / close valve must be provided for each pipe.
The unit price per pipe increases, and the cost of equipment increases. In addition, in the second method, the pipe itself uses a normal pipe. However, since a special apparatus and equipment are used, not only the cost is increased, but also the apparatus is a large-scale apparatus, so that the installation place must be widened. In addition, there is a problem that it is difficult to completely stop water, so that some liquid leakage occurs and it is necessary to clean the inside of the pit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of attaching and detaching a pipe for connecting a pipe to be connected after disconnecting a part of the pipe formed by connecting a plurality of pipes, using a simple device or equipment. It is intended to make it possible to stop the water, and to surely stop the water without leakage. Furthermore, after attaching and detaching work,
It is also an object of the present invention to ensure that the pipe functions as a liquid flow path.

[0007]

In order to solve the above-mentioned problems, an invention according to claim 1 is a method of attaching and detaching a pipe which connects a plurality of pipes and forms a liquid flow path, wherein the pipe is formed. A step of shutting off one pipe with an on-off valve, a step of cooling the other pipe from outside using a refrigerating device, and freezing the liquid inside the pipe to stop the water, Disconnecting the connection between the pipe and the pipe in a water-stop state by the on-off valve; connecting a pipe to be connected to an end of the disconnected pipe while maintaining the frozen state; And warming the water-stopped tube from the outside by the freezing to release the frozen state.

Here, the pipe means a pipe for circulating a liquid such as a fluid for sending and discharging muddy water in the shield method, and a pipe for transferring a liquid such as a water supply and a sewer.

As described above, after stopping the circulation of the liquid by stopping water in one of the pipes constituting the pipe by the open / close valve, the other pipe is cooled from the outside by using a refrigerating device to freeze the liquid in the pipe. As a result, the pipe can be stopped using a simple device. Then, after the freezing, the connection between the water-stopped pipe and the water-stopped pipe by the open / close valve is released, so that the pipe can be easily attached / detached. Further, since the pipe is stopped by freezing the liquid itself, the space between the solidified body due to the freezing of the liquid and the inner wall of the pipe is in a sealed state, so that it is possible to prevent liquid leakage when the pipe is attached and detached.

[0010] In particular, when a pipe connected adjacent to a pipe whose water is stopped by an on-off valve is frozen, there is an advantage that almost no liquid leakage occurs when the pipe is attached or detached thereafter. And, the solidified body in the tube,
Since the pipe is thawed by warming it from the outside and the water stop state of the pipe is released, the water stop of the pipe can be released easily and by using a simple heating device such as a hot water circulation device or a dryer. Thus, the pipe can be reliably made to function as a flow path.

[0011] Since a refrigeration system using liquid nitrogen, for example, can be applied to the refrigeration system, the pipe can be stopped without taking up much space with only a simple device. Similarly, for example, a hot water circulation device or the like can be applied to the heating device. Therefore, only a simple device can be used to release the water stopping state of the pipe without taking much space.

When this method of attaching and detaching a pipe is applied to a pipe for fluid transport of muddy water and muddy water in a shield method, a pipe with an expensive opening / closing valve which has conventionally been often required in the pipe attaching / detaching work. , Which not only reduces the cost of the equipment, but also eliminates the need for special equipment and equipment, and simplifies the equipment by circulating liquid nitrogen and other refrigerants. Since water can be stopped in the piping by a refrigeration device or the like that cools the piping constituting the piping, the cost of the equipment can be reduced.
In addition, there is an advantage that it is not necessary to clean the downhole.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for attaching and detaching a pipe according to the present invention will be described below with reference to FIGS. 1 and 2 show an example of a pipe disassembly method and a pipe assembling method according to the present invention. FIG. 1A shows a pipe before disassembly, and FIG. It is the schematic which shows the process of freezing the liquid inside a pipe | tube, and the process of disconnecting a pipe | tube. 2A is a step of connecting a new pipe, FIG. 2B is a step of thawing the frozen liquid using a heating device, and FIG. 2C is a schematic view showing a state of the pipe after assembly. is there.

The pipe to which the present invention is applied in the present embodiment is installed, for example, on a shield used in a muddy pressurized shield method for excavating a tunnel, and is a pipe for fluid transportation for supplying muddy water and drainage water. It is. In such a shield method, the shield moves forward while excavating rock or the like. It is necessary to add a pipe 8 for feeding and draining water according to the progress of the excavation. In the case of the present embodiment, a portion where a pipe is newly added is shown in FIG.
As shown in (a), a connecting portion 9 between a pipe 2 integrally provided with an on-off valve 2a and another pipe 1 adjacent to the pipe 2.

First, a process of disconnecting the existing pipe 8 will be described with reference to FIG. As shown in FIG. 1A, a connecting portion 9 between a pipe 2 integrally provided with an on-off valve 2a and one of the pipes 1 and 3 adjacent to the pipe 2
1B, the handle 2b is operated to close the open / close valve 2a to stop the flow of the liquid in the pipe 8, as shown in FIG. 1B. Next, the open / close valve 2a
The refrigeration apparatus 4 is arranged so as to cover the outside of the tube 1 which is connected to the tube 2 integrally provided with.

The refrigerating apparatus 4 is provided with, for example, a cold-resistant hose (not shown) through which liquid nitrogen flows, and the starting end of the hose is connected to a liquid nitrogen tank (not shown). The cold-resistant hose is wound tightly around the outer wall of the tube 1 so as to surround it, and then held by a hose fixture (not shown) for holding the hose in the wound state. Then, the other end of the hose is inserted into a separately prepared container (not shown) for collecting liquid nitrogen. The container for recovering liquid nitrogen is a container in which a hose from the refrigerating device is inserted into a storage container for ordinary liquid nitrogen in a gas-tight manner inside the storage container. And a gas exhaust hose for allowing the gas to escape from the inside of the digging hole to the outside.

After the cold-resistant hose is wound several times in this way, the valve of the liquid nitrogen tank is opened and liquid nitrogen flows through the hose. The liquid nitrogen flowing inside the hose freezes the mud inside the tube 1 where the hose is wound.

As shown in FIG. 1 (c), after the muddy water inside the pipe 1 is sufficiently frozen to form a frozen section 5, a connection section 9 between the pipe 1 and the pipe 2 having the opening / closing valve 2a is formed. Disconnect the connection. Here, FIG. 1 (c) shows a method of disconnecting the connection part 9 after removing the refrigeration apparatus 4, but disconnecting the connection part 9 with the refrigeration apparatus 4 attached. May be.

As described above, one of the pipes 2 constituting the flow path for fluid transport is closed by closing the on-off valve 2a, and the other pipe 1 is stopped by freezing the liquid inside. Since water is supplied, the flow of muddy water can be easily stopped by the simple device 4. Therefore, the open / close valve 2a
Thus, the connection of the connecting portion 9 located between the pipe 2 in the water-stop state and the pipe 1 in the water-stop state due to the freezing can be easily released.

Next, a process of adding pipes will be described with reference to FIG. FIG. 2A shows a pipe 10 in which the existing pipe 8 is disconnected and the pipe 6 is newly connected as shown in FIG. 1C, and the muddy water is frozen. A freezing section 5 is present in the tube 1. And FIG.
As shown in (b), the heating device 7 is arranged in the portion where the freezing section 5 is located. The heating device 7 is, for example, a hot water circulating device provided with a hose through which hot water circulates (not shown), and the hot water is wound in a state in which the hose is tightly wound around the outer wall of the portion where the freezing portion 5 of the tube 1 is located. It circulates.

As described above, by thawing the frozen part 5 by the heating device 7, the tube 1 can be easily crushed as shown in FIG.
Water can be released.

In the above embodiment, the pipe 8 is a pipe for transporting fluid in the muddy pressure shield method, but the present invention is not limited to this. The present invention can also be applied to other pipes serving as liquid flow paths, such as pipes for water and sewage pipes and pool facilities.

In the present embodiment, the tubes constituting the connecting portion 9 to be disconnected are tubes 1 and 2 having no branch.
Is shown, but a pipe having a branch may of course be used.
In that case, the required number of pipes is stopped according to the branch of the pipes. Although the refrigerating device 4 uses liquid nitrogen, it may be a device for circulating other refrigerants. that time,
A cooling device that cools a refrigerant by using electricity or the like as a power may be used in combination, and the configuration of the device is not particularly limited as long as it can locally cool the outside of the pipe constituting the pipe.

In this embodiment, a new pipe 6 is added after the pipe 8 is disassembled. However, the original pipe is connected again, or another position of the pipe which originally constituted the pipe is connected. The pipes may be rearranged by connecting to the pipes. Although the heating device 7 circulates warm water, the heating device 7 may be another heating device such as a dryer, and the configuration of the device is not particularly limited as long as it can locally heat the outside of the pipe constituting the pipe. . In addition, it is assumed that the pipe 1 which is brought into a water-stop state by freezing is connected adjacent to a pipe integrally provided with an opening / closing valve. Needless to say, the specific detailed structure and the like, such as another tube located at a distance, can be appropriately changed.

[0025]

As described above, according to the pipe attaching / detaching method according to the first aspect of the present invention, first, one of the pipes constituting the pipe is stopped by the open / close valve to stop the circulation of the liquid. Next, the other pipe is cooled from the outside using a refrigerating apparatus, and the liquid in the pipe is frozen to stop the water, so that the pipe can be stopped using a simple device. Then, after that, the connection between the pipe in the water-stopped state due to the freezing and the pipe in the water-stopped state by the open / close valve can be released to easily attach / detach the pipe. Further, since the pipe is stopped by freezing the liquid inside the pipe, the space between the solidified body of the liquid that stops the flow of the liquid and the inner wall of the pipe is in a sealed state, and it is possible to prevent liquid leakage when the pipe is attached and detached. . Then, the liquid in the pipe is thawed by warming the liquid from the outside of the pipe, and the water stop is released, so that the water stop of the pipe can be released by using a simple and simple heating device, and the pipe can be reliably released. The pipe after the attachment / detachment operation can function as a flow path. Therefore, the pipe can be easily attached and detached, and the cost for the operation can be reduced.

When this method of attaching and detaching a pipe is applied to a pipe for fluid transport of muddy water and wastewater in a shield method, an expensive pipe with an on-off valve, which has conventionally been often required for attaching and detaching the pipe, is used. , Which not only reduces the cost of equipment, but also eliminates the need for special equipment and equipment, and reduces the cost of equipment because the piping can be stopped using simple equipment. it can. In addition, there is an advantage that it is not necessary to clean the downhole.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing steps of a pipe disassembling method as an example to which the present invention is applied.

FIG. 2 is an explanatory view showing steps of a pipe assembling method as an example to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pipe 2 pipe (pipe integrally provided with opening / closing valve) 2a opening / closing valve 2b handle 3 pipe 4 refrigeration unit 5 freezing part 6 pipe (newly connected pipe) 7 heating device 8 pipe 9 connection part 10 pipe

Claims (1)

[Claims] 1. A method for attaching and detaching a pipe that connects a plurality of pipes to form a liquid flow path, wherein a step of shutting off water of one of the pipes by an on-off valve, and freezing the other pipes Using a device to cool from the outside and freeze the liquid inside the tube to stop the water; and breaking the connection between the water-stopped tube and the water-stopped tube by the open / close valve by the freezing. Connecting a pipe to be connected to the end of the disconnected pipe while maintaining the frozen state; and heating the water-stopped pipe from outside by using a heating device to freeze the frozen state using a heating device. And releasing the pipe.