JPH0495690A - Shielding tool for piping - Google Patents

Abstract

PURPOSE:To execute pipe drilling work without giving any damage to the piping strength by providing a supporting portion to support a shielding plate clamping an elastic member so as to move and rotate to the first axial center along a disc member and so as to move to the second axial center and a flow passage for supply and discharge. CONSTITUTION:A shielding tool 1 for piping is the one that a shielding plate 2 is connected to a mainframe 4. The shielding plate 2 consists of a disc member 2a, smaller in dia. than a pipe 5, in which an elastic member 2b such as rubber is held. A supporting portion 3 has a lowering mechanism 3a to move the shielding plate 2 to the first axial center Z1 along the disc member 2a and a translation mechanism 3c to move the same to the second axial center Z2. The elastic member 2b is provided with a pressure fluid supply mechanism 6 to supply pressure fluid such as air, water and oil from the mainframe 4 side of the piping shielding tool 1, and the elastic member 2b and the pressure fluid supply mechanism 6 are connected via a tube 8 as a flow passage for supply and discharge. It is thus possible to execute the shielding work without giving damage to the piping strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piping shutoff tool for shutting off piping, which is used when relocating gas pipes or cutting valves.

[Conventional technology]

Conventionally, some of these pipe shutoff devices have been used for steel pipes. This piping shutoff device is equipped with a disc-shaped shutoff body that has a diameter that is almost the same as the inside diameter of the pipe, and when using it, an opening that has a diameter that is almost the same as the pipe diameter must be opened against the axis of the pipe. Drill a hole at a right angle, insert the aforementioned interrupter into the pipe with the axis of the interrupter parallel to the axis of the pipe, and move the interrupter parallel to the axis of the pipe to shut off the pipeline. It is something to do.

[Problem to be solved by the invention]

However, if such a pipe shutoff device is applied to a medium-pressure cast iron pipe line, for example, the strength of the pipe will be weakened due to the large opening, etc., so this pipe shutoff device should not be used in such cases. I couldn't. That is, until now, it has been impossible to effectively shut off the pipeline in the active state and proceed with construction without reducing the gas pressure in such a medium-pressure pipe.

Therefore, an object of the present invention is to provide a pipe interrupter that can perform drilling work on pipes without causing damage to the pipe strength as much as possible, and that can be used, for example, for existing medium-pressure cast iron pipes. It is to obtain.

[Means to solve the problem]

In order to achieve this object, the characteristic configuration of the pipe shutoff device according to the present invention is that it includes a flat blocking plate having a hollow elastic member sandwiched between a pair of disc members, and the blocking plate is attached to the surface of the disc member. The continuous plate is supported so as to be movable in the direction of the first axis along the axis and rotatable around the first axis, and the continuous plate is movably supported in the direction of the second axis which is the axis of the disk member. and a supply/discharge channel for supplying or discharging pressure fluid to or from the hollow elastic member. and,
Its action and effect are as follows.

[For production]

In other words, the piping shutoff device of the present application includes a shutoff plate, a support portion that positions and supports the shutoff plate,
The elastic member constituting the blocking plate includes a supply/discharge passage for supplying and discharging pressure fluid. Here, this blocking plate is inserted into the pipe to be blocked, and the axis of the disc member is approximately aligned with the axis of the pipe (in this case, the surface of the disc member is perpendicular to the axis of the pipe). ), but during the insertion operation, the support section allows the blocking plate to align its axis (this axis coincides with the second axis, which is the axis of the disk member). The insertion operation is performed in a state in which the disc member is approximately perpendicular to the axis of the pipe (a state in which the surface of the disk member is parallel to the axis of the pipe). After the insertion operation has been completed, the blocking plate is rotated by the support portion and moved to the blocking position to assume the above-mentioned blocking state. Here, in the present application, since the blocking plate is configured to have a flat shape, the insertion hole drilled in the pipe may be long in the pipe axis direction and short in the pipe diameter direction.

Further, after the blocking plate is placed in the above-mentioned blocking state, pressure fluid is fed into the elastic member using the supply/discharge channel to bring the elastic member into close contact with the pipe wall.

In this way, the fluid pressure inside the pipe is received by the disc member supported by the support part, and the pressure inside the pipe is effectively shut off while firmly holding the elastic member held between the disc members. It is.

〔Effect of the invention〕

Therefore, in the pipe shutoff device of the present application, when inserting the shutoff plate into the pipe, it is sufficient to simply drill a hole that is long in the pipe axis direction, and unlike conventional ones, a circular opening approximately equal to the diameter of the pipe is required. There is no need to drill holes. Therefore, the shutoff work can be carried out without causing any damage to the strength of the piping. Furthermore, since the shielding plate is supported by the support portion, it is possible to effectively shut off even relatively high-pressure fluid.

〔Example〕

Embodiments of the present application will be described based on the drawings.

Figures 1 (a) to (c) show the shutoff process using this pipe shutoff device (1).
)) and (c(b)), the structure of the pipe shutoff device (1) of the present application will be explained. This piping shut-off device (1) has a shut-off plate (2) supported by a support portion (3).
). And this support part (3
), the blocking plate (2) is inserted into the piping (5) from the main body side and the posture is manipulated to shut off the piping (5).

Here, this blocking plate (2) is connected to the pipe (5) to be blocked.
) A pair of disk members (
2a) is configured to sandwich an elastic member (2b) made of rubber or the like. The central portion of one side of the blocking plate (2) is connected to the main body (4) of the pipe blocking device by the aforementioned support portion (3). The structure of this support part (3) will be explained in more detail below. This support part (3) includes a lowering mechanism (3a) that moves the blocking plate (2) in the direction of the first axis (Z1) along the surface of the disk member (2a), and A shielding plate (
2), and a translation mechanism (3b) for moving the blocking plate (2) in the direction of the second axis (Z2), which is the axis of the disc member (2a). 3c). The specific configuration is shown in FIG. 2, in which the first motor (m
1), the blocking plate (2) is lowered, and the second motor (m2) provided in the rotating mechanism (3b) is rotated to lower the frame (f) equipped with the above-mentioned lowering mechanism (3a).
is the rotation axis (Zf) of this frame (f) (the axis of this axis is called the first axis (Z1), and its planar position is shown by the mark ■ in Fig. 1 (c (a)). ), and the blocking plate (2) rotates. Then, by further descending operation,
The blocking plate (2) is to be translated in the direction of the axis (Z) of the pipe (5).

Furthermore, the elastic member (2b) of the blocking plate (2) is provided with a pressurized fluid supply mechanism (2) that supplies pressurized fluid such as air, water, oil, etc. from the main body (4) side of the pipe blocking device to the inside thereof. 6), and the inside (7) of the elastic member (2b) and this pressurized fluid supply mechanism (6) are connected by a tube (8) as a supply/discharge flow path. Further, the bottom surface (1b) of the main body of this pipe shutoff device (1) is provided with a connecting portion (10) so as to be connected to a live pipe branch joint (9) attached to the pipe (5).

As mentioned above, as shown in FIGS. 1(A) to 1(C), using the piping shutoff device (1) of the present application, medium pressure piping (5
) is shown at two locations (5a) and (5b). Here, in Fig. 1 (a), live pipe branch joints (
9) is installed, Figure 1 (B) shows the state with bypass piping (11) for bypass installed, and Figure 1 (C (a), (b)) shows the state with the bypass piping (11) installed. A plan view and a side view are shown, respectively, showing a state in which the part where the live pipe branch joint (9) is attached is shut off by the pipe shutoff device (1) of the present application.

Here, examples of medium pressure piping materials to be worked on include ductile cast iron pipes, which are referred to as medium pressure B.
It is used for gas piping of less than 1 kg/cm.

Now, when relocating a specific piping section (work section) (A) due to subway construction, etc., or when you want to cut a valve (not shown) into the pipe conduit, first select this work section. Live pipe branch joints (9) are attached to two locations (5a) and (5b) sandwiching the locations. Next, a drilling machine (not shown) is attached to this live pipe branch joint (9), and the drilling operation is carried out. Here, a shutter member (9a) is attached to this live pipe branch joint (9), so that work can be carried out while maintaining the live pipe state.

Now, using a drilling machine (not shown), a daruma-shaped hole (13) is bored at the location where the live pipe branch joint (9) will be attached. This Daruma-shaped hole (13) has two circular holes (13a) (13a
) are partially overlapped in the direction of the axis (Z) of the pipe, and the Yawata (L) in the direction of this axis (Z) is the hole (L) of the pipe (5).
) is made to be almost the same as the inner diameter (D) of the pipe, and the Yawata (in this case, the diameter of the circular hole) (d) in the pipe radial direction is approximately half the inner diameter of the pipe. There is. This dimensional relationship is determined so that the above-mentioned blocking plate (2) can be inserted into the pipe while maintaining its longitudinal direction (2d) in the direction of the axis (Z) of the pipe.

Here, as described above, when the Daruma-shaped hole (13) is adopted, it can be easily processed using existing equipment.

After such drilling work, the above-mentioned live pipe branch joint (9) is equipped with a bypass pipe connection part (14) instead of a drilling machine (not shown).
The above-mentioned pipe shutoff device (1) is attached.

When performing the replacement operation, be sure to remove the shutter member (9) mentioned above.
a) is effectively used. FIG. 1(b) shows a state in which the bypass pipe connecting portions (14) of two pipe shutoff devices (1) are connected by a pressure-resistant flexible hose serving as a bypass pipe (11). In this state, the main pipe to be worked on has not yet been shut off.

Next, use the pipe shutoff device (1) to close the main pipe at two locations (5a).
The operation for blocking (.5b) will be explained. With the pipe interrupter (1) attached to the above-mentioned live pipe branch joint (9), the lowering mechanism (3a) moves the interrupter plate (2) along its longitudinal direction (2d) to the axis (Z) of the pipe. While maintaining the direction, the lowering operation is performed. When the center of the blocking plate (2) almost coincides with this axis (Z), this blocking plate (2)
It is rotated approximately 90 degrees by the rotation mechanism (3b) and is perpendicular to the direction of the axis (Z) of the pipe. Then, it is further moved by the translation mechanism (3C) in the direction of the axis (Z) of the pipe to outside the range of the Daruma-shaped hole (13). In Figure 1 (c (a), (b)), the solid line shows the state of the cutoff plate (2) when the cutoff is completed, and the state of the cutoff plate (2) when the cutoff is activated (the original position of the cutoff plate (2) and the cutoff The lowered position of the plate (2) is indicated by the dash-dot line and the dash-double-dot line.

Now, in the blocking position (16), the above-mentioned pressurized fluid supply mechanism (6
) is supplied with pressurized fluid. By this operation, the elastic member (2b) is shaped to conform to the inner surface of the tube, making it possible to block gas leakage.

Now, in the structure of the present application, most of the gas pressure is received by the disc member (2a) supported by the support part (3), and the elastic member (2b) seals the disc member (2a) and the inner wall surface of the pipe. However, the structure is such that the uke is held.

Furthermore, in this application, since the insertion and fixation of the blocking plate (2) is performed by a unique mechanism, the intermediate pressure piping (5)
It can be used to block

[Other actual flow side]

In the above-mentioned embodiment, an example was shown in which a Daruma-shaped hole (13) was bored in the live pipe, but the longitudinal direction (2d) of the disc-shaped blocking plate (2) having the shape as described above (this is approximately equal to the inner diameter of the pipe.) Any shape may be adopted as long as the hole can be inserted in the direction of the axis (Z) of the pipe. For example, a rectangular hole can be considered.

Furthermore, a pair of disk members (2a) are used as the blocking plate (2).
An elastic member (2b) is sandwiched between the
) has been described in which the elastic member (2b) is expanded by supplying fluid to the inside of the disk. It is also possible to have a structure that forms a tube. Further, as shown in Fig. 4, a disk-shaped member (2c) with a small diameter is interposed between the pair of disk members (2a), which are similarly disk-shaped. Assume that the disc member (
A membrane-like elastic member (2b) between 2a) and the cylindrical member (2C)
It is also possible to have a configuration in which the two are sandwiched.

Furthermore, the above-mentioned lowering mechanism (3a) and rotation mechanism (3b
) has a structure in which it is lowered and rotated by two motors (m1) and (m2), respectively, but in addition to the above-mentioned lowering mechanism (3a), it is also possible to have a structure as described below. is also possible.

That is, the shaft (Z3) connected to the blocking plate (2) is switched between a freely rotatable state and a state where the shaft (Z3) connected to the blocking plate (2) can freely rotate with respect to the main body (4) of the pipe blocking device, and a state where it stops rotating while being able to slide vertically. A first locking mechanism is provided that can be freely moved. Furthermore, while being driven by the first motor (m1), the shaft (Z
3), in which the shaft (Z3) and this member (30) can rotate relative to each other;
A second locking mechanism is provided that can be freely switched between the state of integral rotation and the state of rotation. In the lowering operation, the first locking mechanism stops the rotation of the shaft (Z3), and the second locking mechanism puts the shaft (Z3) and the driven member (30) in a state where they can rotate relative to each other. When the shaft (Z3) is rotated, the first locking mechanism is in a state where the shaft (Z3) is freely rotatable, and the second locking mechanism is in a state where the shaft (Z3) is freely rotatable. (Z3) and the driven member (30) are switched to rotate integrally, and the blocking plate (2) is rotated. In this case, only one motor is required, and there is no need for a structure that allows the frame (f') to freely rotate.

In addition, between the blocking plate (2) and the main body (4) of the pipe blocking device,
A purge passage (17) as shown in FIG. 5 may be provided,
If such a structure is adopted, it becomes possible to perform the shutoff operation reliably, and it also becomes possible to easily purge the gas pressure in the working area and check for excess gas.

It should be noted that the present invention is not limited to the structure of the attached drawings by writing numbers in the claims for convenient comparison with the drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the pipe shutoff device according to the present invention, and FIG. 1 (a), (b), and (c) are schematic diagrams of the shutoff process, FIG. The figure shows another embodiment of the blocking plate, FIG. 4 shows a further different embodiment of the blocking plate,
FIG. 5 is a diagram showing another embodiment in which a purge path is provided in the blocking plate. (1)...Pipe shutoff, (2)...
Shutoff plate, (2a)...Disc member, (2b)...
...Elastic member, (3) ... Support part, (5)
...Piping, (Z1) ...First axis, (
Z2)...Second axis.

Claims (1)

[Claims] 1. A pipe shutoff device for shutting off a pipe (5), which includes a hollow elastic member (2b) between a pair of disk members (2a).
A flat shielding plate (2) having a configuration in which the shielding plate (2) is sandwiched between the two is provided, the shielding plate (2) is movable in the direction of a first axis (Z1) along the surface of the disk member (2a), and the first axis Uniaxial core (Z1
), and further supports the blocking plate (2) so as to be movable in the direction of a second axis (Z2) that is the axis of the disk member (2a); A pipe shutoff device comprising a supply/discharge channel (8) for supplying or discharging pressure fluid to or from the hollow elastic member (2b). 2. The piping interrupter according to claim 1, wherein the disc member (2a) is made of a hard material.