JPH03294134A - Pipeline crushing jig - Google Patents

Abstract

PURPOSE:To easily crush a pipeline within a short time by interposing the pipeline between a pair of supporting pieces in a fixed frame, and then crushing the pipeline by the pressing force of a hydraulic cylinder in a pipeline crushing jig used to repair the leakage part of the pipeline. CONSTITUTION:A pipeline crushing jig 1 has a pair of supporting pieces 3, 4 in a fixed frame 2, and the supporting pieces 3, 4 have projections 3a, 4a formed on the surfaces opposite to each other, respectively. The support piece 3 is provided on the inner surface of the fixed frame 2, and the support piece 4 is fitted and fixed to the top end of the piston 6 of a hydraulic cylinder 5. One end of a hydraulic hose 8 is connected to the rear end part of the hydraulic cylinder 5, and the other end is connected to a reciprocating actuator 9. To crush a pipeline 12, the pipeline 12 is interposed between the support pieces 3, 4, and the lever 9a of the actuator 9 is operated to supply an oil pressure to the cylinder 5. The piston 6 is operated to crush the pipeline 12 by the projection parts 3a, 4a.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe crushing jig, and more specifically, it is used to repair a leaking part of a pipe in a state where a fluid having a certain pressure is flowing, that is, in use. The present invention relates to a piping crushing jig that is used in the field and is a combination of a reciprocating actuator operated by fluid pressure such as hydraulic pressure or pneumatic pressure, and a clamping piece.

[Conventional technology]

In various industries including the chemical industry, piping is used everywhere because various liquids or gases are handled. Therefore, many pipes are used not only in factories in the manufacturing industry, but also in tap water and gas lines for consumer use. More specifically, fluids that are relatively familiar include commercial water, seawater, steam, tap water, city gas, LPG, process fluids, crude oil, petroleum, and the like.

In general, a piping line has a main pipe whose primary role is to transport fluid, and from this main pipe there are usually small-diameter branches such as drain lines, trap lines, and detection lines for detecting fluid pressure and flow rate. The tube is extending. These branch pipes are considered to be more of an accessory part of the entire piping line, but when viewed from the operational importance, especially from the perspective of safety, in a sense they can be considered the heart. It is a part.

For example, in steam lines in the chemical industry, they are used as drains from the main pipe, trap lines, sampling lines, and pressure detection lines, and may also be used as branch pipes to various plants. In the case of tap water, it may be a line that extends to each household. This pipe comes in various sizes, but branch pipes range from 378 B to IB.
Most of them are of a certain degree. It may also be the main process line. These pipes may be covered with heat insulating material or placed on racks, and water pipes and gas pipes may be buried in the soil. And the connection part is connected by welding or screwing.

The material for these piping is SGP (gas pipe).
Various types of metal piping are used depending on the pressure, temperature, and fluid. It is being When these pipes are used for a long period of time, metal cracks due to dirt on the inside of the pipe, corrosion of the outside surface of the pipe due to rainwater, cracks due to freezing, leakage in the ground due to electrolytic corrosion, and bending due to the load applied by cars etc. , contact with foreign objects may cause serious problems such as damage and leakage. Leakage due to the above corrosion often occurs from the outside of the pipe.

In this way, in the unlikely event that a liquid or gas leak occurs in the piping, the countermeasure is often to temporarily stop the line and replace a portion of the piping by welding or the like. On the other hand, in order to prevent leakage without stopping the pipe, there is a method of applying a U-shaped split band to the pipe via a liquid packing.

[Problem to be solved by the invention]

However, in the conventional technique described above, when a part of the piping is replaced by welding or the like, it is necessary to stop the transfer of fluid in the piping and release the pressure. As a result, all plants connected to the utility line will have to be stopped, resulting in a large production loss. In addition, it takes more than a day to depressurize a large pipe, and depending on the existing valve leakage in the line, the pressure may not be released and it may take a long time, resulting in a large amount of labor.

On the other hand, in the method of applying a band, since the band is applied to the part of the fluid flowing out, the pressure of the fluid flowing out is low;
There was a problem that unless the amount was very small, it would be dangerous for the workers and construction would not be possible.

Therefore, as shown in FIGS. 6(A) and 6(B), conventionally a pair of press-welding pieces Al is used, in which surfaces facing each other on the upstream side of the leakage portion of the piping are formed in a convex shape.

By tightening two bolts B on A2, the pipe C was crushed until its inner surfaces were joined, thereby stopping the pipe from leaking.

However, in order to stop pipe leakage using the pressure welding tool described above, it is done by tightening the two bolts B, which requires a large amount of force and requires careful observation of the tightening condition. It is troublesome and time-consuming. Additionally, bolts must be tightened near leaking pipes, which can pose a danger to workers depending on the pressure and type of fluid.

Therefore, the present invention has been made in consideration of the above circumstances.
The purpose is to provide a pipe crushing jig that can easily and safely crush pipes in a short time.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a pair of clamping pieces provided within a fixed frame and having surfaces facing each other having a convex shape, and at least one of the pair of clamping pieces. It is characterized by comprising a reciprocating actuator that moves the piece toward the other piece by a pressing force, and moves it in the opposite direction and retreats when the pressing force is released.

[For production]

In the present invention having the above configuration, after the upstream side of the leaking pipe is interposed between the pair of clamping pieces, the reciprocating actuator is actuated to move at least one of the pair of clamping pieces toward the other piece. Since the upstream side of the leaking pipe is crushed by moving it, the pipe can be easily and safely crushed in a short time while keeping the pressurized fluid alive.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
The figure shows an embodiment of a pipe crushing jig according to the present invention, and the pipe crushing jig 1 is provided with a pair of clamping pieces 3 and 4 in a fixed frame 2, and the clamping pieces 3 and 4 are arranged opposite to each other. Convex portions 3 on each surface
a, 4a are formed. The clamping piece 3 is provided on the inner surface of the fixed frame 2, and the clamping piece 4 is fitted and fixed to the tip of the piston 6 of the hydraulic cylinder 5. The tip of the hydraulic cylinder 5 is fixed to a support block 7, and the support block 7 is further attached to the fixed frame 2 with bolts.

Further, one end of a hydraulic hose 8 is connected to the rear end of the hydraulic cylinder 5, and the other end is connected to a reciprocating actuator 9. The reciprocating actuator 9 has its lever 9a
By operating this, hydraulic pressure is supplied to the hydraulic cylinder 5 through the hydraulic hose 8, and the piston 6 is moved so that the clamping piece 4 can be moved toward the clamping piece 3 within the fixed frame 2. When the lever 9a is not operated, that is, when the pressing force of the piston 6 is released, the reciprocating actuator 9 moves the holding piece 4 in the opposite direction to the above-mentioned direction and retreats.

In the above configuration, the pipe 1 is
In order to crush the pipe 12, first hold the pipe 12 between a pair of clamping pieces 3 and 4.
Then, by operating the lever 9a of the reciprocating actuator 9 and supplying hydraulic pressure to the hydraulic cylinder 5 through the hydraulic hose 8, the piston 6 is actuated and the clamping piece 4 is clamped within the fixed frame 2. The piping 12 is crushed by moving it toward the piece 3 and pinching it between the convex part 3a of the clamping piece 3 and the convex part 4a of the clamping piece 4.

Fig. 2 shows an example of piping connection. In the figure, an 18B main pipe 10 has multiple branch pipes 1 using 3/4B SGP.
2g, 12b, 12c and 12d are connected as a drain line via an elbow or the like, and a drain valve 13 is attached to the branch pipe 12d at the end. Here, for example, if a leak occurs in the branch pipe 12d on the primary side of the drain valve 13 due to corrosion caused by infiltration of rainwater, the piping is repaired to prevent leakage using the pipe crushing jig 1 as follows. .

That is, as shown in FIG. 2, using the pipe crushing jig 1 at position A of the branch pipe 12b, pressure is applied from the outside until the inner diameter of the branch pipe 12b is reduced by 50%, and the pipe is crushed. A crushed portion 22a is formed as shown in FIG. Next, pressure is applied to the branch pipe 12b that is 15 cm or more away from the end of the crushed portion 22a until the inner diameter is reduced by 70% to form the crushed portion 22b (as shown in the fourth figure). At this time, if the direction of crushing is shifted by 90 degrees, the orifice function will be enhanced and the pressure reduction effect will be greater.

Furthermore, in the same manner as above, from the end of the crushed portion 22b,
The inner diameter of the branch pipes 12b separated by 50II11 or more is 80 to 9.
Apply pressure and crush the crushing portion 22c until it is reduced by 0%.
form. 15 from the end of the crushed portion 22c.
Pressure is applied to the branch pipes 1-2b, which are separated by a distance of more than c, to crush them until their inner diameters are reduced by 95% or more, thereby forming crushed portions 22d as shown in FIG. At this time, it is necessary to perform construction accurately to avoid excessive deformation and cracks in the piping.

Next, the flange 14 is welded to the B position of the branch pipe 12c on the downstream side of the last-stage crushed portion 22d, and the valve 15 is attached to the flange 14 by screwing with a bolt and nut in an open state. Closing valve 15 finally stopped the pipe leakage. Thereafter, the branch pipe 12d may be replaced with a leak-free branch pipe.

In this way, according to this embodiment, the leaking branch pipe 12d
After interposing the upstream side of the clamping piece 4 between the pair of clamping pieces 3 and 4, the reciprocating actuator 9 is operated to move the clamping piece 4 between the clamping pieces 3 and 3.
By moving towards the leaking branch pipe 1
Since the upstream side of the branch pipe 12d is crushed, the branch pipe 12d can be crushed easily and safely in a short time to prevent leakage while keeping the pressurized fluid alive.

Note that the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the above embodiment, only the clamping piece 3 is moved by the reciprocating actuator 9, but a pair of clamping pieces 3 and 4 may be moved so that they approach and move away from each other. Further, although the reciprocating actuator 9 of the above embodiment uses hydraulic pressure, other fluid pressure such as air pressure may be used.

〔Effect of the invention〕

As explained above, according to the present invention, fluids under pressure can be kept alive without suffering large production losses.
The effect is that the piping can be crushed easily and safely in a short time.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing an embodiment of the pipe crushing jig according to the present invention, Fig. 2 is a system diagram showing an example of pipe connection, and Fig. 3 is a partial cross-sectional view showing an example of the pipe crushing jig according to the present invention. 4 is a sectional view taken along the rV-rV line in FIG. 3, FIG. 5 is a sectional view taken along the v-V line in FIG. 3, FIG. 6 (A), ( B)
1 is a sectional view showing a process of crushing a pipe by a conventional pipe pressure welding tool. 1... Piping crushing jig, 2... Fixed frame, 3.4...
Clamping piece, 5... Hydraulic cylinder, 9... Reciprocating actuator, 10... Main pipe, 12a, 12b, 12c
, 12d...branch pipe.

Claims (1)

[Claims] A pair of clamping pieces provided in the fixed frame and having convex surfaces facing each other; at least one of the pair of clamping pieces is moved toward the other piece by a pressing force, and the pressing force is released. A piping crushing jig characterized by comprising a reciprocating actuator that sometimes moves in the opposite direction and retreats.