Pipeline bearing capacity evaluation equipment for simulating water pressure load test

Abstract

The invention relates to pipeline bearing capacity evaluation equipment for simulating a water pressure load test. The pipeline bearing capacity evaluation equipment comprises a reference beam, a reaction frame and an annular pressurizing bag arranged on the reaction frame in a sleeving mode. The counter-force frame can be arranged in a test pipeline, and the annular pressurizing bag can apply pressure to the inner wall of the test pipeline under the support of the counter-force frame; the reference beam is provided with an independent support; and a plurality of displacement monitoring sensors are arranged between the inner wall of the test pipeline and the datum line beam. According to the simulation water pressure load test pipeline bearing capacity evaluation equipment, displacement and strain of a pipeline deformation control point in the loading and unloading process are measured based on an air bag or water bag pressurization method, and the water pressure bearing capacity in a pipeline is evaluated in combination with a finite element theoretical model of a limited area pressurization influence range.

Description

Technical Field

[0001] The present invention relates to an evaluation equipment for the bearing capacity of a pipeline in a simulated water pressure load test, belonging to the technical field of detection and evaluation of high-pressure water transmission pipelines. Background Art

[0002] At present, there are two methods for the internal pressure bearing capacity test of pipelines, both of which are tested on a test bench and cannot be tested on site, which is a very big drawback. They are respectively: (1) lining a steel pipe with sufficient stiffness on the test bench, then sealing and pressurizing. The inner lining steel pipe is 20 cm smaller in diameter than the test pipe; (2) Another test is to apply the 3-point loading method on the test platform to reflect the performance of the pipeline concrete, prestressed steel wires and the water pressure resistance performance through the bending performance of the pipeline. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide a device capable of in-situ testing at the engineering site.

[0004] To solve the above technical problem, the technical solution proposed by the present invention is: an evaluation equipment for the bearing capacity of a pipeline in a simulated water pressure load test, including: a reaction frame and an annular pressurizing bladder sleeved on the reaction frame; the reaction frame can be arranged in the test pipeline, and under the support of the reaction frame, the annular pressurizing bladder can apply pressure to the inner wall of the test pipeline; the reference beam has an independent support; a number of displacement monitoring sensors are installed between the inner wall of the test pipeline and the reference beam.

[0005] The further improvement of the above solution is: a number of brackets extend from the reaction frame, and walking wheels are installed on the brackets; the reaction frame can move along the test pipeline through the walking wheels.

[0006] The further improvement of the above solution is: the reaction frame can support a number of annular pressurizing bladders arranged at intervals at the same time.

[0007] The further improvement of the above solution is: in the annular pressurizing bladder, a number of chambers are separated.

[0008] The further improvement of the above solution is: a number of strain gauges are arranged at intervals on the circumference of the inner wall of the test pipeline corresponding to the annular pressurizing bladder, and a strain protection cover is covered on the strain gauge.

[0009] The further improvement of the above solution is: a displacement lead-out part for the loading center position is installed on the circumference of the inner wall of the test pipeline corresponding to the annular pressurizing bladder; the displacement monitoring sensor is arranged between the displacement lead-out part and the reference beam.

[0010] To solve the above technical problems, another technical solution proposed by the present invention is: the method of using the above-mentioned simulation water pressure load test pipeline bearing capacity evaluation equipment, which includes the following steps: (1) After wire breakage detection and appearance inspection, select the pipe fittings that need to be tested and evaluated to determine the safe water transmission pressure of the water transmission pipeline; (2) During the water cut-off period, transport the reaction frame, annular pressure bag, test monitoring instruments, sensors and acquisition instruments to the test point; (3) According to the wire breakage detection data, design the loading load scheme; theoretically calculate the load-displacement and load-strain process curves; (4) Formulate a loading mechanism, including loading levels, the magnitude of each level of load, and the duration. According to the theoretical and measured responses and the time process trend, design the load, analyze whether to continue loading, and analyze the bearing capacity of the pipe fittings; analyze the state of the structure as elastic or plastic according to the displacement and strain residual amounts before and after loading and unloading; (5) After testing one point, move the loading and testing equipment and then carry out testing at another point. Each point can be tested more than 3 times, and one pipe fitting can be tested at more than 3 points; (6) Comprehensively evaluate the pipe fittings by combining the wire breakage detection data, appearance inspection data, material performance data, and loading test data; (7) After testing and analyzing multiple representative pipe fittings and measuring points, evaluate the capacity of the entire pipeline and put forward operation suggestions and maintenance suggestions.

[0011] The simulation water pressure load test pipeline bearing capacity evaluation equipment provided by the present invention is based on the air bag or water bag pressurization method, measures the displacement and strain of the pipeline deformation control points during the loading and unloading processes, and combines the finite element theoretical model of the limited influence range of pressurization in a limited area to evaluate the water pressure bearing capacity of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 is a schematic structural diagram of a preferred embodiment of the present invention.

[0014] Figure 2 is a schematic side view structural diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS Embodiment

[0015] The simulation water pressure load test pipeline bearing capacity evaluation equipment of this embodiment is as Figure 1 and Figure 2As shown in the figure, it includes: a reaction frame 1 and an annular pressure bag 2 sleeved on the reaction frame 1; the reaction frame 1 can be arranged in the test pipeline 3, and under the support of the reaction frame 1, the annular pressure bag 2 can apply pressure to the inner wall of the test pipeline 3; the reference beam 4 has an independent support structure, and this support structure spans the test section of the test pipeline 3 to provide support for the reference beam 4, thereby avoiding the position change of the reference beam 4 caused by strain. In this way, the position of the reference beam 4 is stable during the test. A number of displacement monitoring sensors 5 are arranged between the inner wall of the test pipeline and the reference beam to measure the deformation data of the inner wall of the test pipeline 3 during the test. The reaction frame 1 extends with a number of brackets, and traveling wheels are installed on the brackets; the reaction frame 1 can move along the test pipeline 3 through the traveling wheels. The annular pressure bag 2 can be an air-powered air bag or a liquid-powered liquid bag according to site needs.

[0016] A number of strain gauges are arranged at intervals on the circumference corresponding to the annular pressure bag 2 on the inner wall of the test pipeline. The strain gauges are used to measure the strain of the inner wall of the test pipeline. In order to avoid the pressure interference of the annular pressure bag 2 on the strain gauges, a rigid strain protection cover 6 is covered on the strain gauges.

[0017] A displacement lead-out part for the loading center position is installed on the circumference corresponding to the annular pressure bag 2 on the inner wall of the test pipeline; this component is set to enable the displacement monitoring sensor 5 to accurately measure the displacement generated by the position of the loading center of the annular pressure bag 2. The displacement lead-out part for the loading center position is a rigid component, one end of which is fixed on the inner wall of the test pipeline, and the other end is led out from the side of the annular pressure bag 2. The displacement generated on the inner wall of the test pipeline will drive the displacement lead-out part for the loading center position to generate the same displacement. The displacement monitoring sensor 5 is arranged between the displacement lead-out part and the reference beam 4. In this way, by using the immovable reference beam 4 as a reference, the displacement generated by the position of the inner wall of the test pipeline corresponding to the loading center of the annular pressure bag 2 can be detected.

[0018] The usage method of the simulation water pressure load test pipeline bearing capacity evaluation equipment in this embodiment includes the following steps: (1) After wire breakage detection and appearance inspection, select the pipe fittings that need to be tested and evaluated to determine the safe water transmission pressure of the water transmission pipeline; (2) During the water cut-off period, transport the reaction frame 1, the annular pressure bag 2, the test monitoring instruments, sensors and acquisition instruments to the test site; (3) According to the wire breakage detection data, design the loading load scheme; theoretically calculate the load-displacement and load-strain process curves; (4) Formulate the loading mechanism, including loading grading, the magnitude of each level of load, the duration, and design the load according to the theoretical and measured responses and the time process trend, analyze whether to continue loading, and analyze the bearing capacity of the pipe fittings; analyze the state of the structure as elastic or plastic according to the residual displacement and strain before and after loading and unloading. After testing one point, move the loading and testing equipment and then conduct testing at another point. Each point can be tested more than 3 times, and one pipe fitting can be tested at more than 3 points; (6) Comprehensively evaluate the pipe fittings by integrating the broken wire detection data, appearance investigation data, material property data, and loading test data; (7) After testing and analyzing multiple representative pipe fittings and measuring points, evaluate the overall pipeline capacity and put forward operation suggestions and maintenance suggestions.

[0019] Furthermore, the annular pressure bladder 2 can be continuous, spaced, or spaced in compartments to achieve the combined effect of different internal and external pressures of the simulated pipeline in different specified areas, and to evaluate the pipeline state by means of an asymmetric loading method. The present invention is not limited to the specific technical solutions described in the above embodiments. In addition to the above embodiments, the present invention can also have other embodiments. Any technical solution formed by equivalent replacement falls within the protection scope required by the present invention.

Claims

1. An evaluation equipment for the bearing capacity of pipelines in a simulated water pressure load test, characterized in that, Comprising: A reference beam, a reaction frame, and an annular pressure bladder sleeved on the reaction frame; The reaction frame can be arranged in the test pipeline. Under the support of the reaction frame, the annular pressure bladder can apply pressure to the inner wall of the test pipeline; the reference beam has an independent support; several displacement monitoring sensors are installed between the inner wall of the test pipeline and the reference beam.

2. The simulated water pressure load test pipeline bearing capacity evaluation equipment according to claim 1, characterized in that: Several brackets extend from the reaction frame, and walking wheels are installed on the brackets; the reaction frame can move along the test pipeline through the walking wheels.

3. The simulated water pressure load test pipeline bearing capacity evaluation equipment according to claim 1, characterized in that: The reaction frame can support several annular pressure bladders arranged at intervals at the same time.

4. The simulated water pressure load test pipeline bearing capacity evaluation equipment according to claim 1, characterized in that: In the annular pressure bladder, several chambers are separated.

5. The simulated water pressure load test pipeline bearing capacity evaluation equipment according to claim 1, wherein: Several strain gauges are arranged at intervals on the circumference corresponding to the annular pressure bladder on the inner wall of the test pipeline, and a strain protection cover is covered on the strain gauge.

6. The simulated water pressure load test pipeline bearing capacity evaluation equipment according to claim 1, characterized in that: A displacement lead-out piece for the loading center position is installed on the circumference corresponding to the annular pressure bladder on the inner wall of the test pipeline; the displacement monitoring sensor is arranged between the displacement lead-out piece and the reference beam.

7. The method of using the evaluation equipment for the bearing capacity of pipes in the simulated water pressure load test according to claim 1, characterized in that Including the following steps: (1) After wire breakage detection and appearance inspection, select the pipe fittings that need to be tested and evaluated to determine the safe water transmission pressure of the water transmission pipeline; (2) During the water cut-off period, transport the reaction frame, annular pressure bladder, test monitoring instruments, sensors and acquisition instruments to the test site; (3) According to the wire breakage detection data, design the loading load scheme; theoretically calculate the load-displacement and load-strain process curves; (4) Formulate the loading mechanism, including loading levels, the magnitude of each level of load, the duration, design the load according to the theoretical and measured responses, the time process trend, analyze whether to continue loading, and analyze the bearing capacity of the pipe fittings; analyze the state of the structure as elastic or plastic according to the residual displacement and strain before and after loading and unloading. (5) After testing one point, move the loading and testing equipment, and then carry out testing at another point. Each point can be tested more than 3 times, and one pipe fitting can be tested at more than 3 points; (6) Comprehensively evaluate the pipe fittings by integrating the wire breakage detection data, appearance inspection data, material performance data, and loading test data; (7) After testing and analyzing several representative pipe fittings and measuring points, evaluate the capacity of the entire pipeline, and put forward operation suggestions and maintenance suggestions.

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