CN116046296A - Partial seal detection device and method for a large closed pipeline - Google Patents

Abstract

The invention discloses a local seal detection device and a local seal detection method for a large-scale closed pipeline, wherein the detection device comprises a pipeline and two air bags connected through a connecting cable, the two air bags are respectively arranged at the upstream and the downstream of the pipeline, the air bags are connected with an inflating pump through ventilating pipes, and a rubber sealing ring is arranged between the air bags and the inner wall of the pipeline after the air bags are filled with air; the pipeline is connected with one end of a water pipe through a switch valve, and the other end of the water pipe is connected with a water pump. The detection method and the adopted auxiliary device have the advantages of quick, efficient and reusable capability, no damage and no change of the original pipeline, high safety and reliability and low cost.

Description

Partial seal detection device and method for a large closed pipeline

technical field

The invention relates to the fields of water conservancy engineering, municipal engineering, test technology and the like, in particular to an efficient and quick local seal detection device and method for large closed pipelines.

Background technique

Water pipelines are widely used in various water conservancy projects and municipal projects such as drought and flood control, water delivery and irrigation, water diversion and power generation; of course, with the continuous development of test technology, pipelines have gradually become important research fields such as water conservancy, ports, and machinery. Indispensable and important component of the device. The pipeline and its supporting pumps, valves and other equipment together form a water delivery system. Usually, the pipeline and the pipeline, and the pipeline and the pump valve are sealed and connected by flanges and rubber rings, and the quality of the connection between them will become The key to the efficient and stable operation of water pipelines in the later stage. Therefore, before the official operation, the leak detection of the pipeline (especially the connection between the pipeline and other components) is particularly important.

At present, the detection of pipeline sealing is usually carried out after the completion of the entire project. After the project is completed, inject liquid (water body, gas or other liquid) into the entire pipeline system, pressurize to the target pressure, and then carry out the sealing condition inspection. However, the above method has the following problems: the leak point can only be detected after the project is completed. If it needs to be dismantled, rework will occur, the cost will increase, and the construction period will be extended. If the system is more complicated, it is difficult to find the leak point and determine the cause of the leak. Therefore, if the seal detection of local connection parts can be carried out in time during the construction process, the efficiency of construction and detection will be greatly improved, rework will be avoided, and the seepage resistance reliability of the connection parts will be effectively improved, and the treatment of leakage points will be adequate. The time and space work surface. Of course, when performing local inspection, because the entire pipeline system is not completely sealed, some auxiliary devices are required for partial sealing before inspection can be carried out. And these selected auxiliary devices can neither damage or change the inner wall of the original pipeline, but also need to have the flexibility and good economy of the test.

Therefore, in view of the above problems, it is necessary to propose a set of local sealing detection device and method for large closed pipelines.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a fast, efficient and economical local seal detection device and method for large closed pipelines, the detection process does not destroy or change the original structure, and can be repeated Utilization, high safety and reliability, and low cost.

The purpose of the present invention is achieved by the following technical solutions:

A partial seal detection device for a large closed pipeline, including a pipeline, the local seal detection device includes two airbags connected by a connecting cable, the two airbags are respectively arranged upstream and downstream of the pipeline, and the airbags are all passed through a ventilation tube An air pump is connected, and a rubber sealing ring is arranged between the airbag and the inner wall of the pipeline after being filled with gas; the pipeline is connected to one end of the water pipe through a switch valve, and the other end of the water pipe is connected to a water pump.

Further, the pipeline is also provided with a through-flow submersible pump, a butterfly valve, expansion joints and embedded flanges.

The present invention also provides a local seal detection method for a large closed pipeline, comprising the following steps:

(1) The two airbags are connected by connecting cables, and the two airbags are in an uninflated dry state;

(2) Transport the two airbags to the upstream and downstream of the pipeline, and respectively place them at the preset points to be tested;

(3) Inflate the two upstream and downstream airbags through the air pump and the ventilation pipe to make the airbags bulge and gradually fit the inner wall of the pipeline;

(4) Install a rubber sealing ring between the air bag and the inner wall of the pipe before the air bag and the inner wall of the pipe are completely attached, and continue to inflate;

(5) Stop inflating, turn off the air pump, and maintain the internal pressure of the airbag until the air pressure in the airbag reaches the test condition, and the rubber sealing ring is completely attached to the inner wall of the airbag and the pipe;

(6) Open the on-off valve, inject water into the pipe through the water pump and the water pipe, and continue to pump water until the water body is completely full; continue to pump water through the water pump until the water pressure meets the detection requirements, stop pressurization, and turn off the switch valve, maintain pressure;

(7) At the same time, observe whether the water pressure in the pipeline and the air pressure in the air bag are attenuated; when the above-mentioned pressures are maintained stable, use the naked eye to identify whether there is water seepage or water leakage at the connection parts of the various components in the pipeline. Find leaks in time, determine the cause of leaks, and make rectifications;

(8) After the test is completed, open the switch valve to reduce the pressure of the water body in the pipeline; gradually discharge the gas in the airbag, and the water body in the pipeline will drain naturally through both sides during the shrinkage of the airbag;

(9) When the airbag is completely dry, it can be pulled out and reused through one side.

Compared with the prior art, the beneficial effects brought by the technical solution of the present invention are:

1. The detection device and method of the present invention adopts the upstream and downstream double airbags with rubber sealing rings and connecting cables to realize the temporary sealing of the pipeline for partial detection, which has significant beneficial effects. First of all, the design of upstream and downstream double airbags and rubber sealing rings can effectively seal local pipelines without installing other sealing devices. There is damage caused by the side wall of the pipe; secondly, the upper and lower airbags are connected by a connecting cable, which can ensure that the upper and lower airbags are always integrated during the working process. Safety guarantee, when there is an unbalanced detection pressure in the pipeline, the airbag on one side will provide support and reaction force to the airbag on the other side, so as to ensure that the airbag on the other side will not pop out directly due to uneven pressure and cause safety hazards; again, the airbag pressure can be Flexible adjustment, by adjusting the pressure of the air bag, the detection of pipelines under different pressure conditions can be realized, so that the detection pressure range is large and the flexibility is enhanced; in addition, the equipment and components used in the above detection method are simple in design and construction, low in cost, and have great application prospects Very impressive.

2. The detection device and method are fast, efficient, and reusable, do not damage or change the original pipeline, have high safety and reliability, and are low in cost.

Description of drawings

Fig. 1 is a schematic structural view of a partial seal detection device for a large closed pipeline in a specific embodiment.

Reference signs: 1-air bag, 2-connecting cables, 3-breather pipe, 4-air pump, 5-rubber sealing ring, 6-switch valve, 7-water pipe, 8-water pump, 9-pipeline, 10- Through-flow submersible pump, 11-butterfly valve, 12-expansion joint, 13-embedded flange, 14-concrete foundation.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Figure 1, a partial seal detection device for a large closed pipeline provided by this implementation includes an air bag 1, a connecting cable 2, a ventilation pipe 3, an air pump 4, a rubber sealing ring 5, a switch valve 6, a water pipe 7, Parts such as water pump 8 and pipeline 9 are completed jointly. Wherein, one airbag 1 is arranged on the upstream and downstream of the pipeline 9, and the size is determined according to the actual size of the pipeline 9. In this embodiment, the diameter of the airbag is 1.6m; two airbags 1 upstream and downstream are connected by a connecting cable 2 , the length of the cable is 5m; the outer end of each airbag 1 is provided with a ventilation pipe 3, and the ventilation pipe 3 is connected to the external air pump 4; Closely connected between the walls), and a rubber sealing ring 5 is set to ensure the sealing performance; an on-off valve 6 is set outside the tested pipeline 9, and the outside of the on-off valve 6 is connected to the water pipe 7, and the water pipe 7 is connected to the water pump 8.

Based on the above detection device, this embodiment also provides a local seal detection method for large closed pipelines, which is a general method for detecting the connection parts of large pipelines and valves in water conservancy projects, municipal engineering, and test devices. The pipeline to be tested is also equipped with a cross-flow submersible pump 10, a butterfly valve 11, an expansion joint 12 and a pre-embedded flange 13, etc. The testing process is as follows:

(1) The upstream and downstream airbags 1 are connected by connecting cables 2, and the upstream and downstream airbags 1 are not inflated and are in a shriveled state;

(2) Transport the airbag 1 to the test point of the pipeline to be tested, and perform precise positioning;

(3) Inflate the upstream and downstream airbags 1 through the air pump 4 and the ventilation pipe 3 to make them bulge, and gradually fit the side walls of the embedded flange 13;

(4) Before the airbag 1 and the side wall of the pre-embedded flange 13 are fully attached, a rubber sealing ring 5 is added and the inflation is continued;

(5) Until the air pressure in the airbag 1 reaches the test conditions, and the rubber sealing ring 5 is completely attached to the side wall of the airbag 1 and the embedded flange 13, stop inflating, turn off the air pump 4, and keep the internal pressure of the airbag 1 at 0.3 kg/cm ² ;

(6) Open the on-off valve 6, inject the water body into the test pipe 9 through the water pump 8 and the water pipe 7, continue to pump water until the water body is fully stored, and then continue to pressurize until the water pressure reaches 1.2kg/ ^cm2 , then stop adding water. pressure, close the on-off valve 6, and maintain the pressure;

(7) At the same time, observe whether the water pressure in the pipeline 9 and the air pressure in the air bag 1 are attenuated; when the above pressures are stable, identify the pipeline 9, the cross-flow submersible pump 10, the butterfly valve 11, the expansion joint 12, and the embedded flange with the naked eye 13 Whether there is water seepage or water leakage in the connection parts of each component, if there is water seepage and water leakage, it is necessary to find the water leakage point in time, determine the cause of the water leakage, and make rectification;

(8) After the detection is completed, open the switch valve 6 to reduce the pressure of the water body in the pipeline 6; gradually discharge the gas in the airbag 1, and the water body in the pipeline 6 will drain naturally through both sides during the shrinkage of the airbag;

(9) When the airbag 1 is completely dried up, it can be pulled out and reused through one side.

The above embodiment is a large-scale flow-making experimental water tank, the maximum flow rate can reach 4.5m ³ /s, the inner diameter of each component of the pipeline 9, the cross-flow submersible pump 10, the butterfly valve 11, the expansion joint 12, and the embedded flange 13 is 1.6m The pre-embedded flange 13 is embedded and pre-embedded in the concrete foundation 14, and becomes a whole with the concrete foundation 14.

The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solution of the present invention, and the above specific embodiments are only illustrative and not restrictive. Without departing from the gist of the present invention and the scope of protection of the claims, those skilled in the art can also make many specific changes under the inspiration of the present invention, and these all belong to the protection scope of the present invention.

Claims (3)

1. A local seal detection device for a large closed pipeline, comprising a pipeline, characterized in that, said local seal detection device comprises two air bags connected by connecting cables, and the two air bags are respectively arranged on the upstream and downstream of the pipeline, said The airbags are connected with an air pump through a ventilation pipe, and a rubber sealing ring is arranged between the airbag and the inner wall of the pipeline after being filled with air; the pipeline is connected with one end of the water pipe through a switch valve, and the other end of the water pipe is connected with a pump. water pump. 2. The local seal detection device for a large closed pipeline according to claim 1, characterized in that the pipeline is also provided with a through-flow submersible pump, a butterfly valve, an expansion joint and a pre-embedded flange. 3. A local sealing detection method of a large closed pipeline, characterized in that, comprising the following steps: (1) The two airbags are connected by connecting cables, and the two airbags are in an uninflated dry state; (2) Transport the two airbags to the upstream and downstream of the pipeline, and respectively place them at the preset points to be tested; (3) Inflate the two upstream and downstream airbags through the air pump and the ventilation pipe to make the airbags bulge and gradually fit the inner wall of the pipeline; (4) Install a rubber sealing ring between the air bag and the inner wall of the pipe before the air bag and the inner wall of the pipe are completely attached, and continue to inflate; (5) Stop inflating, turn off the air pump, and maintain the internal pressure of the airbag until the air pressure in the airbag reaches the test condition, and the rubber sealing ring is completely attached to the inner wall of the airbag and the pipe; (6) Open the on-off valve, inject water into the pipe through the water pump and the water pipe, and continue to pump water until the water body is completely full; continue to pump water through the water pump until the water pressure meets the detection requirements, stop pressurization, and turn off the switch valve, maintain pressure; (7) At the same time, observe whether the water pressure in the pipeline and the air pressure in the air bag are attenuated; when the above-mentioned pressures are maintained stable, use the naked eye to identify whether there is water seepage or water leakage at the connection parts of the various components in the pipeline. Find leaks in time, determine the cause of leaks, and make rectifications; (8) After the test is completed, open the switch valve to reduce the pressure of the water body in the pipeline; gradually discharge the gas in the airbag, and the water body in the pipeline will drain naturally through both sides during the shrinkage of the airbag; (9) When the airbag is completely dry, it can be pulled out and reused through one side.

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