JPH07109273B2 - Fluid transport pipe working method and apparatus used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a working method, for example, when a valve is attached to a sewer pipe without stopping water flow in the sewer pipe. Attach a connection case to the outer periphery, attach a work sluice valve to the opening for inserting the pipe work tool of this connection case, attach a sealing case to this sluice valve, and place the fluid transport pipe at the planned drilling point. Alternatively, by forming an enclosed space around the hole and operating the outside with the sluice valve open, the pipe working tool located in the sealing case is piped through the sluice valve and the insertion port. A fluid-conveying pipe work method in which the pipe is moved to the work position, the pipe work is performed, then the pipe is moved into the sealing case, and then the sluice valve is closed, and then the sealing case is separated from the sluice valve. Regarding the device used.

[Conventional technology]

According to the above method, the fluid transport pipe is formed in a state in which the circumference of the hole formed in the fluid transport pipe or the hole formed in the fluid transport pipe is a closed space by the three cases of the connection case, the work sluice valve, and the sealing case. Was to be drilled and installed in the hole.

Therefore, even if the above-mentioned perforation or valve installation is performed while performing fluid transportation in the fluid transportation pipe, it is possible to prevent the transportation fluid from leaking to the outside during those operations. The transport fluid leaked from the hole formed in the fluid transport pipe into the enclosed space filled the entire enclosed space.

[Problems to be Solved by the Invention]

Therefore, according to the conventional work method, when the sealing case is detached from the sluice valve after the confronting work such as perforating the fluid transport pipe or installing a valve, the transport fluid filled in the sealing case is Scatter on. As a result, when the transport fluid is sewage, not only the work environment is significantly deteriorated due to scattering of filth and odors around the sewage, but also filth and floating substances adhere to the sealing case connection part of the gate valve, When connecting the sealing case for valve installation to the sluice valve so that the valve is installed in the hole after drilling the fluid transport pipe, make sure that the connection is made securely on the flange surface of the sluice valve or the connecting case. Maintenance is required to remove adhered dirt and suspended matter, which reduces work efficiency.

An object of the present invention is to provide a method and a device that can perform a counter pipe work such as perforation and valve installation without leaking the transport fluid to the outside.

[Means for Solving the Problems]

A feature of the working method for a fluid transport pipe of the present invention is that a connecting case is attached to an outer peripheral portion of a fluid transport pipe, and a sluice valve for working is attached to an opening for inserting a pipe working tool of the connecting case. Attach a sealing case to the sluice valve to form a sealed space around the planned location of the fluid transport pipe or around the hole, and position it in the sealing case by an external operation with the sluice valve open. The counter pipe working tool is moved to the counter pipe working position through the gate valve and the insertion port to perform the counter pipe work, and then moved into the sealing case, and in that state, the gate valve is closed and then sealed. In the working method for a fluid-conveying pipe that separates the case from the sluice valve, the mouth of the connecting case is arranged upward or downward so that it does not mix with the transport fluid and is lighter or heavier than the transport fluid. Fluid,
The filling pressure is set and filled in the closed space so that the boundary surface between the filling fluid and the transport fluid leaked from the hole is located in the connection case.

Further, the features of the fluid transport pipe working device in the present invention are:
A work sluice valve that is attached to the outer circumference of the fluid transportation pipe and can be connected / disconnected at one end to the rising opening for inserting the pipe work tool of the connection case, and a seal that can be connected / disconnected to the other end of this sluice valve. In the working device for a fluid transport pipe, which is provided with a case for use, and in which the anti-pipe working tool is movably operated from the outside in the case for sealing, the rising portion of the connecting case is arranged upward or downward, A sealed space surrounded by the sluice valve, a sealing case, and a connecting case is formed above or below the fluid transport pipe, and the side closer to the fluid transport pipe inner space than the working sluice valve position is. A fluid filling device for press-fitting and filling a filling fluid is provided in the closed space, and the fluid filling device discharges a filling fluid having a property that does not mix with the transport fluid and has a specific gravity different from that of the transport fluid. And that In which the boundary surface between the fluid and leaked transport fluid from the hole for Hama has set the filling pressure to be located within the connecting case.

As the fluid filling device, it is preferable to use one that press-fills air.

[Action]

The sealed space is filled with fluid, and the interface between the transport fluid leaking into the sealed space from the hole and the filling fluid is located in the connection case, so the transport fluid leaked from the hole is used as a sluice valve or for sealing. Never reach into the case.

When the fluid transportation pipe is targeted, the liquid level of the transportation fluid leaked from the hole can be located in the connection case by filling the sealed space with the fluid. If the sewage is light so that the dirt in the sewage floats on the water, the dirt may float up in the filling fluid. On the other hand, in the case of the device of the present invention, since the sealed space is press-filled with a fluid lighter than the transporting fluid, the sewage sewage is stopped at the liquid surface position, and the sewage even reaches the inside of the gate valve or the sealing case. It can suppress rising.

〔The invention's effect〕

As a result, according to the method of the present invention, even when performing the counter pipe work while carrying out fluid transport in the fluid transport pipe, not only during the counter pipe work but also for sealing after the counter pipe work of perforation or valve installation. Even when the case and sluice valve are removed, it is now possible to prevent the transport fluid from leaking out and scattering.

Further, according to the device of the present invention, it is of course possible to prevent the expected sewage leakage surely and prevent the deterioration of the working environment.
In particular, when the target pipe is a sewer pipe, it has become possible to improve workability by preventing adhesion of dirt and floating substances to the sealing case connection portion of the sluice valve.

Further, as will be shown in Examples below, when air is used as the press-fitting filling gas, a light filling fluid can be easily obtained and handled.

〔Example〕

 Next, examples of the present invention will be described.

As shown in FIG. 1 to FIG. 6, make a hole (a) in the sewer pipe (A) while preventing water from leaking outside while allowing water to pass through the sewer pipe (A). A device for performing a counter pipe work for attaching a valve (B) to the hole (a), which is a counter pipe of a connection case (1) attached to an outer peripheral portion of a sewer pipe (A). A sluice valve (2) for work that is connectable / disconnectable to one end of the rising pipe portion (1A) for inserting a work tool, and the other end of this sluice valve (2)
A detachable bowl-shaped sealing case (3) is provided, and the sluice valve (2), the sealing case (3) and the connection case (1) are provided.
A closed space (4) surrounded by and is provided with a fluid filling device (5) for press-filling air from a hole (2a) formed in the valve box (2A) of the sluice valve (2).

The connection case (1) has a structure in which the rising portion (1A) is integrally connected to a tubular portion (1B) that is externally fitted and attached to the sewer pipe (A), and the tubular portion (1B). Is a structure that is divided into a plurality of parts in the circumferential direction. The seal material is provided between the inner peripheral surfaces of both ends of the tubular portion (1B) and the outer peripheral surface of the sewer pipe (A) and between the split surfaces of the tubular portion (1B). (6) is interposed.

The sluice valve (2) is mounted on the connection flange (1a) of the rising opening (1A) of the connection case (1), and the bolt (7) is pressed against the connection flange (1a). It is connected and fixed to the rising opening (1A).

The sealing case (3) is flange-connected to the sluice valve (2), and there are two types, one for perforation and one for valve installation.

The case (3A) for perforation holds a driving and operating shaft (3a) equipped with a cutter (8) at its lower end in the ceiling so as to be slidable vertically while the cutter (8) is installed inside. The operation shaft (3
It is equipped with a drive unit (9) that rotates and slides a).

The case for valve installation (3B) has a control shaft (3b) that is detachably equipped with a valve (B) at the lower end of the ceiling, and a valve (B).
The valve (B) is mounted on the connecting flange (1a) of the rising opening (1A) of the connecting case (1) and is connected to the connecting flange. (1a) valve lid (B1) temporarily fixed with bolts from the bottom side and valve stem (B2) held by this valve (B1)
And the valve body (B
3) consists of

The fluid filling device (5) includes a hole (2) for the sluice valve (2).
This is a compressor that is connected by disconnecting the pipe (11) to a) and has a press-fit pressure adjustment function.

Next, the procedure of the working method for attaching the valve (B) to the sewer pipe (A) using the working device configured as described above will be described.

[1] As shown in FIG. 1, the connecting case (1) is attached to the sewer pipe (A) with its rising opening (1A) opening upward, and at the rising opening (1A). Connect the gate valve (2) in the open state.

[2] As shown in FIG. 2, the perforating case (3A) of the sealing case (3) is attached to the sluice valve (2), and the fluid filling device (5) is operated to close the sealed space (4). ) Is pressurized, and in this state, the cutter (8) is lowered to the cutting work position through the sluice valve (2) and the rising opening (1A) to form the hole (a) in the sewer pipe (A), Pull up into the case (3A) for perforation and close the gate valve (2). In addition, the filling pressure of the fluid filling device (5) is set so that the water level (WL) of the sewage leaking into the closed space (4) due to the cutting by the cutter (8) is opposed to the internal pressure of the sewer pipe (A). It is the pressure for holding the position inside the connection case (1).

[3] As shown in FIG. 3, the case (3A) for perforation is separated from the sluice valve (2).

[4] Connect the valve installation case (3B) with the valve (B) to the sluice valve (2) as shown in FIG.
The fluid filling device (5) opens the sluice valve (2) while pressurizing and filling air into the closed space (4) so as to maintain the current state.

[5] As shown in FIG. 5, the valve (B) is lowered through the sluice valve (2) until its valve lid (B1) abuts the connecting flange (1a) of the rising opening (1A), Temporarily fix the lid (B1) to the connecting flange (1a).

[6] As shown in FIG. 6, the fixation of the valve installation case (3B) to the sluice valve (2) is released, and the valve installation case (3B) is lifted along the operation shaft (3b). Operation axis in the state (3b)
The valve installation case (3B) is disengaged by disconnecting the valve and the valve (B), the sluice valve (2) is disengaged from the rising opening (1A), and the valve lid (B1) is rising. While permanently fixing it to (1A), lower the valve body (B3) into the sewer pipe (A).

[Another embodiment]

 Another embodiment of the present invention will be described below.

[1] In the above embodiment, the compressor is shown as the fluid filling device (5), but the fluid filling device (5) may be an air cylinder filled with air under pressure.

[2] In the above embodiment, the mouth portion (1) of the connection case (1) is
A) is used as a rise port, and air is used as a filling fluid for the sealed space (4) to prevent leakage of sewage.
As shown in the figure, the mouth (1A) of the connection case (1) is opened downward, and as a filling fluid for the sealed space (4),
A liquid that is heavier than water and that separates water may be used to prevent the sewage from descending to the sluice valve (2). Of course, the combination of the transport fluid and the filling fluid for carrying out the present invention in the case where the mouth portion (1A) of the connection case (1) is continuously provided above is as follows: Is a lighter liquid combination, [b] a transport fluid is a liquid, a filling fluid is a gas, [c] a transport fluid is a gas, and a filling fluid is a lighter gas, while the connection case is Mouth of (1) (1
The combination in which the present invention can be carried out when A) is connected in a downward direction is as follows: [d] A combination of a transport fluid is a gas, a filling fluid is a heavier gas than that, and [e] a transport fluid is a gas, a filling fluid Is a combination of liquids, and [f] the transport fluid is a liquid, and the filling fluid is a heavier liquid. As an example of [f], there is an example in which the transport fluid is oil and the filling fluid is water.

[3] In the above embodiment, a hole (2a) is formed in the valve box (2A) of the sluice valve (2), and air is press-fitted into the closed space (4) through the hole (2a). However, holes may be provided in the sealing case (3) and the connection case (1) so that air is press-filled into the sealed space (4).

[4] When the mouth portion (1A) of the connection case (1) is continuously arranged upward as in the above embodiment, as shown in FIG. 8, the connection case (1) is filled. Connect the fluid escape pipe (12). In this filling fluid release pipe (12),
A valve (13) such as a relief valve that automatically opens when the pressure of the opening / closing operation valve or the filling fluid exceeds a set value is provided. In this case, the valve (13) is artificially or automatically opened to prevent over-pressurization of the filling fluid and prevent the filling fluid from entering the fluid transport pipe (A). The interface between the transport fluid and the transport fluid can be maintained in the connecting case (1). As a result, particularly when the transport fluid is a liquid and the filling fluid is a combination of gases, an impact caused by the filling gas entering the liquid transport pipe (A) (generally called a water hammer when the transport fluid is water) There is no such thing), and damage to the liquid transport pipe (A) can be prevented.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a working method for a fluid-conveying pipe and an apparatus used therefor according to the present invention. FIGS. 1 to 6 are cross-sectional views in each working step, and FIGS. It is sectional drawing which shows another Example of invention. (A) …… Fluid transport pipe, (1) …… Connection case, (1
A) ... Port, (2) ... Silver valve, (3) ... Sealing case, (4) ... Sealed space, (5) ... Fluid filling device,
(8) …… Anti-pipe work tool.

Claims (3)

[Claims] 1. A connecting case (1) is attached to an outer peripheral portion of a fluid transport pipe (A), and a sluice valve for working is provided at an opening (1A) for inserting a pipe working tool into the connecting case (1). (2) is attached, and a sealing case (3) is attached to the sluice valve (2) to form a closed space (4) around the planned drilling point of the fluid transport pipe (A) or around the hole (a). By operating the sluice valve (2) from outside with the sluice valve (2) open, the counter pipe working tool (8) located in the sealing case (3) is inserted into the sluice valve (2) and the insertion port (1A). ) Through the pipe to the pipe working position, and then the pipe is moved to the sealing case (3), and in that state the sluice valve (2)
A method for working a fluid-conveying pipe in which the sealing case (3) is detached from the sluice valve (2) after the valve is closed, and the mouth portion (1A) of the connection case (1) is arranged upward or downward. A filling fluid that is immiscible with the transport fluid and is lighter or heavier than the transport fluid in the sealed space (4) and the hole (a).
The interface with the transport fluid leaked from the case for connection (1)
A working method for a fluid-conveying pipe in which the filling pressure is set so as to be located inside. 2. A rising opening portion (1A) for inserting a pipe working tool of a connection case (1) attached to the outer circumference of a fluid transport pipe (A).
Sluice valve for work that can be connected and disconnected at one end (2)
And a sealing case (3) that can be connected / disconnected freely at the other end of the sluice valve (2), and the pipe working tool (8) is internally mounted in the sealing case (3) so as to be movable from the outside. A working device for a fluid transportation pipe, wherein the rising portion (1A) of the connection case (1) is arranged upward or downward, and the working device for a fluid transportation pipe is provided at a position above or below the fluid transportation pipe (A). A closed space (4) surrounded by the sluice valve (2), the sealing case (3) and the connection case (1) is formed, and the fluid transport pipe (A) is located at a position higher than the working sluice valve (2) position. A fluid filling device (5) for press-filling a filling fluid is provided in the closed space (4) close to the inner space, and the fluid filling device (5) does not mix with the transport fluid. And discharging a filling fluid having a specific gravity different from that of the transport fluid, A working device for a fluid transport pipe, wherein the filling pressure is set so that the boundary surface with the transport fluid leaking from the hole (a) is located in the connection case (1). 3. A working device for a fluid transport pipe according to claim 2, wherein said fluid filling device (5) press-fills air.