JP2851932B2 - How to shut off piping - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe shutoff method for shutting off a pipeline of a pipe used when a gas pipe is relocated or a valve is cut.

[Conventional technology]

Conventionally, as a method of shutting off such pipes, there is a method used for steel pipes. This method of shutting off a pipe is provided with a disc-shaped blocker having a diameter substantially equal to the inner diameter of the pipe, and in using the same, an opening having a diameter substantially equal to the diameter of the pipe is provided with respect to the axis of the pipe. Drill at a right angle, insert the above-mentioned blocking body into the pipe with the direction of the surface of the blocking body parallel to the axis of the pipe, and move this blocking body parallel to the pipe axis direction to block the pipe line. Is what you do.

[Problems to be solved by the invention]

However, for example, when such a pipe disconnection method is applied to a medium-pressure cast iron pipe line, the pipe strength is weakened due to a large opening or the like, so this pipe disconnection method is used in such a case. I couldn't. In other words, it has not been possible to effectively shut off the pipeline in such a medium pressure pipe in a live pipe state without reducing the gas pressure thereof and to proceed with the construction.

Therefore, an object of the present invention is to provide a method for cutting off a pipe which can be performed as much as possible without damaging the strength of the pipe, and which can be used, for example, for an existing cast iron pipe of medium pressure. It is to get.

[Means for solving the problem]

In order to achieve this object, a first characteristic configuration of the pipe blocking method according to the present invention includes a vertical operation perpendicular to the pipe axis direction of the pipe and a vertical operation along a first axis. An operation shaft that enables both rotation around one axis
A shut-off valve having a flat disk shape and supporting a shut-off plate capable of shutting off a pipe line in the pipe is prepared, and the pipe of the pipe is located near the scheduled shut-off position and at a position deviated from the scheduled shut-off position. On the upper surface of the wall, a long hole is formed in the pipe axis direction, and the blocking plate is freely penetrable, and is formed by drilling a long hole. Inserted into the pipe in a posture along the axis, and the blocking plate was rotated around the first axis in the pipe so that the surface of the blocking plate was directed in the pipe axis direction. Then, the blocking plate is pushed in the pipe axis direction toward the planned blocking position in the pipe, and the blocking plate is radially expanded at the planned blocking position to expand the pipe in the pipe. To cut off the road.
And the 2nd characteristic structure is using the said shut-off valve in which the outer peripheral part of the said 1st characteristic structure is able to swell radially.

 The operation and effect are as follows.

(Operation)

That is, in the pipe blocking method of the present application, the pipe has an upper hole in the pipe axis direction in the upper surface of the pipe, and a flat blocking plate supporting the flat hole through the long hole. In the pipe by the operation with the operation shaft, from above, in a direction along the surface, the surface is lowered and inserted in a posture along the pipe axis direction, and in the pipe, the blocking plate is vertically After being rotated around the core, the surface, that is, the blocking surface is directed in the tube axis direction to take a posture in a blocking state, and then the blocking plate is pushed into the pipe in the tube axis direction. It is. Accordingly, the radial width of the pipe of the elongated hole is such that the blocking plate is configured to have a flat shape, so that the blocking plate only needs to be passed through together with the operating shaft, and the pipe is perforated. The insertion hole may be a long hole that is long in the pipe axis direction and short in the pipe diameter direction, and can prevent the strength of the pipe from being reduced. Here, the disc-shaped block inserted in the pipe having the cut-off symmetry is such that the second axis, which is the axis of the disc, substantially coincides with the pipe axis of the pipe (in this case, the blocking surface of the cut-off plate is in line with the pipe axis. When the insertion operation is performed, the disc-shaped blocking plate moves the second shaft center, which is the shaft center, with respect to the pipe axis of the pipe. This is because the insertion operation is performed in a substantially perpendicular state (a state in which the surface of the blocking plate is parallel to the tube axis direction). Then, after the tentative insertion operation is completed, the blocking plate is rotated around the first axis in the vertical direction by the operation shaft supporting the blocking plate, so that the surface of the blocking plate faces the pipe axis direction. hand,
The posture in the above-mentioned blocking state is taken. Here, the pipe is moved in the pipe axis direction to the cut-off scheduled position, the diameter is increased at the cut-off scheduled position, and the pipeline is cut off with the cut-off scheduled position set as the cut-off position.

In blocking the pipe, the blocking plate is brought into the above-described blocking state, and then the outer peripheral portion of the blocking plate is bulged in the radial direction to be in close contact with the pipe wall. In other words, the diameter of the outer peripheral portion that is swellable in the radial direction is increased. Here, the shut-off plate is supported by an operation shaft that enables both up-down operation along a first axis in a vertical direction perpendicular to the tube axis direction and rotation operation around the first axis. By using the shut-off valve, if the operation of downward translation, rotation around the first axis, and translation in the pipe axis direction is performed by the operation shaft, the fluid pressure inside the pipe is shut off by the operation shaft. Take it with a board,
The pressure in the pipe can be effectively shut off.

〔The invention's effect〕

Therefore, in the pipe blocking method of the present application, when inserting the blocking plate into the pipe, it is only necessary to drill a long hole in the pipe axis direction as a hole, and as in the conventional case, the insertion port is substantially equal to the pipe diameter. There is no need to pierce. Therefore, in the blocking operation, the pipe can be blocked without causing damage to the pipe strength. Further, since the blocking plate is supported by the operation shaft, it is possible to effectively block even a relatively high-pressure fluid. As a result, it has become possible to perform construction by shutting off the pipeline in the state of a live pipe, even for a medium-pressure pipe having a high gas pressure among gas pipes.

〔Example〕

 An embodiment of the present application will be described with reference to the drawings.

FIGS. 1 (a) to 1 (c) show a shut-off step according to the pipe shut-off method. First, FIG. 1 (c) (a)
The configuration of the pipe breaker (1) used in the pipe blocking method of the present invention will be described with reference to (c). The pipe blocking device (1) is configured such that a blocking plate (2) is connected to a main body (4) of the pipe blocking device by a support (3) provided on an operation shaft (12). The support part (3) and the shut-off plate (2) constitute a shut-off valve. The support plate (3) inserts the blocking plate (2) downward from the main body side into the pipe (5), and rotates and pushes the pipe (5) into the pipe (5) to perform a posture operation. It cuts off the pipeline. Here, the blocking plate (2) is formed by attaching an elastic member (2b) made of rubber or the like to a pair of disk members (2a) formed slightly smaller than the inner diameter of the pipe (5) to be cut off. The outer peripheral portion can be swelled in the radial direction by being sandwiched. Then, the central portion on one side of the blocking plate (2) is connected to the main body (4) of the pipe blocking tool by the support portion (3) described above. The configuration of the operation shaft (12) including the support (3) will be described in more detail below. This operating shaft (12) is a first shaft center (Z1) of the first shaft center (Z1) arranged along the plane of the aforementioned disk member (2a) and perpendicular to the tube axis (Z) of the pipe (5). Mechanism (3a) for moving the blocking plate (2) in the direction, a rotating mechanism (3b) for rotating the blocking plate (2) around the first axis (Z1), and a support provided therein. In the section (3), this blocking plate (2) is oriented in the direction of the pipe axis (Z) of the pipe (5), that is, in the direction of the second axis (Z2) which is the axis of the disc member (2a). It has a translation mechanism (3c) for moving it to the right. The specific configuration is shown in FIG. 2, in which the shut-off plate (2) is lowered together with the operating shaft (12) by the rotation of the first motor (m1) provided in the lowering mechanism (3a), and is turned. By the second motor (m2) provided in the mechanism (3b), the frame (f) provided with the above-mentioned lowering mechanism (3a) is rotated by the rotation axis (Zf) of this frame (f). First shaft core (Z1)
In FIG. 1 (c), the position in plan view is indicated by an x mark. ), And the blocking plate (2) rotates. Then, by further lowering the operating shaft (12),
The support portion (3) functions to translate the blocking plate (2) in the direction of the axis (Z) of the pipe (5).

Further, a pressurized fluid supply mechanism (6) for supplying a pressurized fluid such as air, water, oil or the like to the inside of the elastic member (2b) of the blocking plate (2) from the body (4) side of the pipe blocking device. ) Is provided, and the inside (7) of the elastic member (2b) and the pressurized fluid supply mechanism (6) are connected by a tube (8) as a supply / discharge flow path. Further, a connection portion (10) is provided on the bottom surface portion (1b) of the main body of the pipe breaker (1) so as to be connected to a live pipe branch joint (9) attached to the pipe (5).

As described above, FIGS. 2 (a) to 2 (c) show the method of shutting off the pipe of the present application using the pipe shut-off device (1) to connect two pipes (5) of the medium pressure in a live pipe state. Planned cutoff position (S)
The step of shutting off is shown. Here, FIG. 1 (a)
The state where the active pipe branch joint (9) is attached to the two scheduled cutoff positions (S) of the pipe (5) to be cut off is shown in FIG.
FIG. 1 (b) shows a state in which a bypass pipe (11) for bypass is attached, and FIGS. 1 (a) and 1 (b) show
A plan view and a side view of a state in which a portion where the active pipe branch joint (9) is attached to each of the cutoff positions (S) is cut off by the pipe cutoff (1) are shown. Here, as a medium-pressure pipe material to be worked, a ductile cast iron pipe can be mentioned, and it is configured to be used for a gas pipe called a medium pressure B of 3 kg / cm ² or less. When a specific piping section (working section) (A) is relocated or a valve (not shown) is to be cut into a pipe line along with subway work or the like, this working section is used first. A live pipe branch joint (9) is attached to two scheduled cutoff positions (S) sandwiching the portion. Next, a drilling machine (not shown) is attached to the live pipe branch joint (9), and the pipe (5) is drilled into the pipe wall (5a). Here, a shutter member (9a) is attached to the live pipe branch joint (9) so that work can be performed while maintaining the live pipe state. Now, using a drilling machine (not shown), a live pipe branch joint (9)
A dalma-shaped slot (13) is drilled in the tube wall (5a) at the attachment site of (1). This Dharma-shaped hole (13) has two circular holes (13
a) and (13a) are perforated in a state where they are partially overlapped with each other in the direction of the pipe axis (Z) of the pipe (5), and the hole width (L) in the direction of the pipe axis (Z) is equal to that of the pipe (5). And the hole width (d) (in this case, the diameter of the circular hole) in the radial direction of the pipe is set to about half of the inner diameter of the pipe. This dimensional relationship is such that the longitudinal direction (2d) of the above-mentioned blocking plate (2) is maintained in the attitude in the direction of the pipe axis (Z) of the pipe (5),
Decide so that it can be inserted into the tube. Here, as described above, when the Dharma-type hole (13) is adopted, the processing can be easily performed with existing equipment.

After such a drilling operation, the above-mentioned live pipe branch joint (9) is replaced with a bypass pipe connecting part (14) instead of a drilling machine (not shown).
The above-mentioned pipe cut-off device (1) provided with is attached. In the replacement operation, the above-mentioned shutter member (9a) is effectively used. In FIG. 1 (b), the bypass pipe connection part (14) of the two pipe breakers (1) is a bypass pipe (11).
Are connected by a pressure-resistant flexible hose. In this state, the main pipe to be worked has not been shut off yet.

Next, an operation of shutting off the main pipe at two scheduled shutoff points (S) using the pipe shutoff device (1) will be described. With the pipe shut-off device (1) attached to the above-mentioned live pipe branch joint (9), the operating shaft (12) is lowered by the lowering mechanism (3a) to move the shut-off plate (2) in its longitudinal direction ( 2d) is maintained in the direction of the pipe axis (Z) of the pipe (5), that is,
The lowering operation is performed in a posture in which the surface of the blocking plate (2) is along the pipe axis (Z). Then, when the center of the blocking plate (2) substantially coincides with the pipe axis (Z), the blocking plate (2) is rotated about the operating shaft (12) by the rotating mechanism (3b), and is substantially rotated. Rotate 90 degrees and turn its surface in the direction of the tube axis (Z). Further, an operating shaft (12) for supporting the blocking plate (5)
Is pushed and moved in the direction of the tube axis (Z) to the scheduled cutoff position (S) outside the range of the Dharma-shaped hole (13) by the translation mechanism (3c). In FIG. 1 (c), (a) and (b), the interruption plate (2) located at the interruption position (16) in the interruption completion state is indicated by a solid line, and the state of the interruption plate (2) during the interruption operation (the interruption plate). (2)
(The position before the turning operation and the position where the blocking plate (2) is lowered) are shown by a dashed line and a two-dot chain line, respectively.

Now, at the blocking position (16), the above-described pressurized fluid supply mechanism (6) is attached to the elastic member (2b) provided on the blocking plate (2).
Supply more pressurized fluid. By this operation, the diameter of the elastic member (2b) is increased, and the elastic member (2b) is shaped along the inner surface of the pipe, so that gas leakage can be blocked.

Now, in the above-mentioned pipe shut-off device, most of the gas pressure is received by the disk member (2a) of the shut-off plate (2) supported by the support portion (3) of the operating shaft (12). The elastic member (2b) bears the seal between 2) and the inner wall surface of the pipe.

Further, in the present application, since the insertion and fixing of the blocking plate (2) is performed by a unique mechanism, it can be used for blocking the pipeline of the medium pressure pipe (5).

(Another embodiment)

In the above-described embodiment, an example is shown in which a dharma-type hole is formed as a long hole (13) in the live tube. However, in the longitudinal direction (2d) of the disc-shaped blocking plate (2) having the shape described above. Place the part (which is approximately equal to the inside diameter of the pipe) to the pipe (5)
Any shape may be used as long as it can be inserted in a posture along the direction of the tube axis (Z). For example, a rectangular hole is conceivable.

Furthermore, a pair of disk members (2a) are used as the blocking plate (2).
The structure in which the elastic member (2b) is interposed in the middle and the fluid is supplied into the elastic member (2b) to expand the elastic member (2b) has been described, but as shown in FIG. It is also possible to adopt a structure in which a tube is formed by an elastic member on the outer periphery of the solid member. In addition, as shown in FIG. 4, a disk having the same disk shape in the middle of a pair of disk members (2a), and a small-diameter solid cylindrical member (2c) interposed between both disk members (2a). It is also possible to adopt a configuration in which a film-like elastic member (2b) is sandwiched between the disk member (2a) and the columnar member (2c).

Further, the aforementioned lowering mechanism (3a) and the rotating mechanism (3b)
In the above configuration, the motor is lowered and rotated by the two motors (m1) and (m2). In addition to the above-described lowering mechanism (3a), the configuration described below is adopted. Is also possible.

That is, the operation shaft (12) supporting the blocking plate (2) can be freely switched between a state in which the operating shaft (12) can be freely moved with respect to the body (4) of the pipe breaker and a state in which the rotation is stopped while being slidable up and down. Is provided. Further, in the driven member (30) which is driven by the first motor (m1) and is screwed with the operation shaft (12), the operation shaft (12) and the member (30) rotate relative to each other. Ready state,
A second locking mechanism is provided that can be switched to a state in which it rotates integrally. Then, in the lowering operation, the first locking mechanism stops the rotation of the operation shaft (12), and
The second locking mechanism switches the operation shaft (12) and the driven member (30) to a relatively rotatable state, and lowers the operation shaft (12). The state in which the locking mechanism allows the operation shaft (12) to rotate freely and the state in which the second locking mechanism rotates the operation shaft (12) and the driven member (30) integrally are switched to a state where the blocking plate ( 2) is rotated. In this case, only one motor is required, and a configuration that allows the frame (f) to rotate freely is not required.

In addition, between the blocking plate (2) and the body (4) of the pipe blocking device,
A purge path (17) as shown in FIG. 5 may be provided. When such a structure is employed, the shutoff operation can be reliably performed, and the gas pressure in the working section can be easily purged and the passing gas can be confirmed.

It should be noted that, although numbers are described in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by the entry.

[Brief description of the drawings]

The drawings show an embodiment of a method for shutting off piping according to the present invention,
FIGS. 1 (a), 1 (b) and 1 (c) are schematic views of a shut-off step, FIG. 2 is a view showing the internal structure of a shut-off device usable in the pipe shut-off method of the present invention, and FIG. FIG.
The figure shows another embodiment in which the shutoff is different, and FIG. 5 is a view showing another embodiment in which a purge passage is provided in the shutoff plate. (2) ... shut-off plate, (5) ... pipe, (5a) ... pipe wall, (12) ... operating shaft, (13) ... long hole, (S) ... scheduled cut-off position, (Z)… Pipe axis, (Z1) …… First axis, (Z2)…
... the second shaft core.

Claims (2)

(57) [Claims] A method of shutting off a pipe in a pipe (5), comprising: a first axial core (Z1) in a vertical direction perpendicular to a pipe axis (Z) direction of the pipe (5). A flat disk-shaped pipe in the pipe (5) is connected to an operating shaft (12) that is capable of operating both up and down in the direction along the axis and rotation about the first axis (Z1). A shut-off valve supporting a shut-off plate (2) that can be shut off is prepared, and the pipe wall of the pipe (5) is located near the expected shut-off position (S) and at a position deviated from the expected shut-off position (S). (5a) On the top,
A long hole (13) is formed to be long in the pipe axis (Z) direction and penetrable through the blocking plate (2), and the blocking plate (2) is formed in the formed long hole (13). 2) is inserted from above into the pipe (5) with its surface along the first axis (Z1), and the blocking plate (2) is inserted into the pipe (5) in the pipe (5). After rotating around the uniaxial core (Z1) to make the surface of the blocking plate (2) face the direction of the tube axis (Z), the blocking plate (2) is placed in the pipe (5). Pushing in the direction of the pipe axis (Z) toward the scheduled blocking position (S), the blocking plate (2) is radially expanded at the scheduled blocking position (S), and the piping (5) How to cut off pipes inside the pipe. 2. A method of shutting off a pipe according to claim 1, wherein said shut-off valve is used in which an outer peripheral portion of said shut-off plate (2) is swellable in a radial direction.