Testing device and testing method for testing performance of underground pipeline joint

Abstract

The invention provides a test device and a test method for testing the performance of an underground pipeline joint, and relates to the technical field of underground pipeline performance tests. The test device can simulate the complex stratum condition below the underground pipeline and the joint through the spring set device, simulate the special conditions such as geological defects which are not beneficial to the stress of the underground pipeline and the joint, and test the mechanical properties of the joint under the conditions; the device has a flexibly configured test environment, and comprises a load transfer frame which can be adjusted into different types according to different requirements of load types and distribution, a geotechnical material which can be adjusted according to stratum attributes of test requirements, and the attributes of the stratum below the pipeline can be adjusted by adjusting the elastic coefficient and the arrangement position of springs in the spring group device.

Description

Technical Field

[0001] The invention relates to the technical field of underground pipeline performance testing, and in particular to a testing device and a testing method for testing the performance of underground pipeline joints. Background Art

[0002] With the rapid development of industrialization and urbanization, the demand for urban underground infrastructure construction has increased dramatically. As an important part of the city's lifeline, the safe operation of underground pipelines is particularly important. Underground pipelines are mainly composed of pipe sections and pipe joints, and the sealing and pressure resistance of pipe joints are directly related to the safety and reliability of the entire pipeline system.

[0003] At present, during the installation and maintenance of underground pipelines, the quality of pipeline joints often fluctuates due to differences in construction technology and materials, which may lead to serious problems such as leakage or pipeline rupture. The patent with application publication number CN114705566A provides a mechanical property test device and method for underground pipeline joints, which can realize comprehensive testing of mechanical properties such as torsion, tension, compression, and bending of pipelines. However, the test device can only be tested under specific conditions, without considering the interaction between pipe and soil, lacks the versatility and flexibility suitable for simulating complex underground environments, and cannot simulate the deformation of underground pipelines under real stress conditions. Therefore, it is particularly urgent to develop a test device and test method that can evaluate the performance of underground pipeline joints under complex formation conditions. For this reason, there is an urgent need for a test device and test method for testing the performance of underground pipeline joints, which can simulate the complex formation conditions under the pipeline, simulate special conditions such as geological defects that are not conducive to the stress of underground pipelines and joints, simulate the real load transfer process when the rock and soil bodies with different characteristics are overlaid on the pipeline, and test the mechanical properties of pipeline joints under these conditions. The test device should have a flexibly configurable test environment, including variable loads, formation properties, etc., to provide more scientific data support and theoretical basis for the design and construction of underground pipelines. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a test device and a test method for testing the performance of underground pipeline joints, which solves the problem that the underground pipeline joint performance test cannot simulate the deformation of the underground pipeline under the actual stress state.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A test device for testing the performance of underground pipeline joints, the test device comprising: a test box, a spring group device, a load transfer frame and a measuring component;

[0007] The spring assembly device comprises: a top plate, a spring, a slider and a slide rail;

[0008] The top plate is fixed on the top of the spring, the slider is fixed on the bottom of the spring, and the slider is slidably connected to the slide rail;

[0009] A plurality of slide rails are arranged at the bottom of the test box, a dense non-woven fabric is laid on the top sheet, geotechnical materials are placed on the non-woven fabric, and underground pipes with joints are buried in the geotechnical materials;

[0010] A crossbeam is arranged above the test box, and the bottom of the crossbeam is connected to the load transfer frame through a jack;

[0011] The measuring assembly comprises: an earth pressure box sensor and an optical fiber sensor;

[0012] The soil pressure box sensor is buried in the rock and soil material;

[0013] The inner wall of the underground pipeline is provided with a plurality of accommodating grooves, and the optical fiber sensors are installed in the accommodating grooves.

[0014] Preferably, the test box comprises: steel beams, steel columns, steel frames, tempered glass and steel plates;

[0015] The steel beams and steel columns are welded to form the frame of the test box. The sides and bottom of the frame are welded with steel frames for reinforcement. Steel plates are installed on the left and right sides of the frame, and tempered glass is installed on the front and back sides.

[0016] Preferably, the crossbeam is installed above the test box via a bracket.

[0017] Preferably, the load transfer frame comprises: a first I-beam.

[0018] Preferably, the load transfer frame comprises: a first I-beam and a plurality of second I-beams;

[0019] The first I-beam is installed at the bottom of the beam through a jack, the second I-beam is perpendicular to the extension direction of the first I-beam, and the second I-beam is placed on the top of the geotechnical material.

[0020] Preferably, the load transfer frame comprises: a first I-beam, a load plate and a plurality of second I-beams;

[0021] The first I-beam is installed at the bottom of the beam through a jack, the second I-beam and the first I-beam are perpendicular to each other in their extending directions, the load plate is placed on the top of the geotechnical material, and the second I-beam is installed on the top of the load plate.

[0022] A test method for testing the performance of underground pipeline joints, the test method comprising the following steps:

[0023] S1. Select springs with various elastic coefficients. According to the requirements of the experimental design, install the springs with the specified elastic coefficients at the specified position of the slide rail through the slider. Install the slide rail with the springs installed at the specified position at the bottom of the test box.

[0024] S2. Lay a dense non-woven fabric on the top sheet, place the underground pipeline with a joint on the non-woven fabric, and adjust the underground pipeline to the position of the experimental design to match the position of the spring group device;

[0025] S3, inject the prepared geotechnical materials in layers into a test box pre-coated with lubricating grease on all sides, and set up soil pressure box sensors at predetermined positions;

[0026] S4. After the filling is completed, a load transfer frame is arranged on the top of the geotechnical material according to the required load distribution pattern;

[0027] S5. Start the jack for pre-loading, compact the rock and soil materials in the test box, and check that all monitoring instruments are operating normally. After the inspection, unload the load;

[0028] S6. Start the jack to start the test, continue to push and read the monitoring data of the soil pressure box sensor and the optical fiber sensor during the whole process until the joint is damaged, and this round of test is over;

[0029] S7. Adjust the combination type and arrangement position of the spring group devices with different elastic coefficients, repeat S1 to S6, and obtain the performance data of the underground pipeline joint under various complex formation conditions.

[0030] The present invention provides a test device and a test method for testing the performance of underground pipeline joints. Compared with the prior art, the present invention has the following beneficial effects:

[0031] In the present invention, the test device can simulate the complex stratum conditions below the underground pipeline and the joint through the spring group device, simulate the special conditions such as geological defects that are not conducive to the stress of the underground pipeline and the joint, and test the mechanical properties of the joint under these conditions; it has a flexibly configured test environment, including a load transfer frame that can be adjusted to different types according to different requirements of load type and distribution, geotechnical materials that can be adjusted according to the stratum properties required by the test, and the properties of the stratum below the pipeline can be adjusted by adjusting the elastic coefficient and arrangement position of the spring in the spring group device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is an axonometric diagram of the test device in Example 1 of the present invention;

[0034] Figure 2 This is a front view of the test device in Example 1 of the present invention;

[0035] Figure 3 It is a side view of the test device in Example 1 of the present invention;

[0036] Figure 4 It is a top view of the test device in Example 1 of the present invention;

[0037] Figure 5 A partial exploded view of the spring assembly device in Example 1 of the present invention;

[0038] Figure 6 Schematic diagram of the structure of the spring assembly device in Example 1 of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of underground pipelines and joints in Example 1 of the present invention;

[0040] Figure 8 It is a structural schematic diagram of the load transfer frame in Example 1 of the present invention;

[0041] Fig. 9 It is a structural schematic diagram of a load transfer frame in Embodiment 2 of the present invention;

[0042] Fig.10 It is a structural schematic diagram of the load transfer frame in Example 3 of the present invention;

[0043] The reference numerals in the figure are set as: earth pressure box sensor 1, joint 2, underground pipeline 3, tempered glass 4, spring group device 5, top plate 51, spring 52, slider 53, slide rail 54, cross beam 6, jack 7, load transfer frame 8, bracket 9, steel beam 10, steel column 11, steel frame 12, steel plate 13, non-woven fabric 14, receiving groove 15, optical fiber sensor 16. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The embodiments of the present application provide a test device and a test method for testing the performance of underground pipeline joints, thereby solving the problem that the underground pipeline joint performance test cannot simulate the deformation of the underground pipeline under the actual stress state.

[0046] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0047] Embodiment 1:

[0048] like Figures 1 to 8 As shown, the present invention provides a test device for testing the performance of underground pipeline joints, the test device comprising: a test box, a spring group device 5, a load transfer frame 8 and a measuring assembly;

[0049] The spring assembly device 5 includes: a top plate 51, a spring 52, a slider 53 and a slide rail 54;

[0050] The top sheet 51 is fixed to the top of the spring 52, the slider 53 is fixed to the bottom of the spring 52, and the slider 53 is slidably connected to the slide rail 54;

[0051] A plurality of slide rails 54 are arranged at the bottom of the test box, a dense non-woven fabric 14 is laid on the top sheet 51, a rock material is placed above the non-woven fabric 14, and an underground pipe 3 with a joint 2 is buried in the rock material;

[0052] A crossbeam 6 is arranged above the test box, and the bottom of the crossbeam 6 is connected to a load transfer frame 8 via a jack 7;

[0053] The measuring assembly comprises: an earth pressure box sensor 1 and an optical fiber sensor 16;

[0054] The soil pressure box sensor 1 is buried in the rock material and is used to detect the pressure transmission when the jack 7 is loaded;

[0055] The inner wall of the underground pipeline 3 is provided with a plurality of receiving grooves 15 , and the optical fiber sensors 16 are installed in the receiving grooves 15 for measuring the deformation of the joint 2 when loaded.

[0056] like Figures 1 to 4 As shown, the test box includes: a steel beam 10, a steel column 11, a steel frame 12, a tempered glass 4 and a steel plate 13;

[0057] The steel beams 10 and steel columns 11 are welded to form the frame of the test box. The sides and bottom of the frame are welded with steel frames 12 for reinforcement. Steel plates 13 are installed on the left and right sides of the frame, and tempered glass 4 is installed on the front and back sides to facilitate observation of the internal conditions of the test box.

[0058] like Figures 1 to 4 As shown, the crossbeam 6 is installed above the test box through a bracket 9.

[0059] like Figure 1 , Figure 2 , Figure 3 , Figure 8 As shown, the load transfer frame 8 comprises: a first I-beam;

[0060] The first I-beam is installed at the bottom of the crossbeam 6 through a jack 7 .

[0061] Embodiment 2:

[0062] like Fig. 9 As shown, the load transfer frame 8 includes: a first I-beam and a plurality of second I-beams;

[0063] The first I-beam is installed at the bottom of the crossbeam 6 through a jack 7. The extension directions of the second I-beam and the first I-beam are perpendicular to each other, and the second I-beam is placed on top of the geotechnical material.

[0064] Embodiment 3:

[0065] like Fig.10 As shown, the load transfer frame 8 includes: a first I-beam, a load plate and a plurality of second I-beams;

[0066] The first I-beam is installed at the bottom of the crossbeam 6 through a jack 7, the second I-beam and the first I-beam extend perpendicularly to each other, the load plate is placed on top of the geotechnical material, and the second I-beam is installed on top of the load plate.

[0067] Embodiment 4:

[0068] The present invention provides a test method for testing the performance of underground pipeline joints, the test method comprising the following steps:

[0069] S1. Select springs 52 with various elastic coefficients, install the springs 52 with the specified elastic coefficients at the specified position of the slide rail 54 through the slider 53 according to the requirements of the experimental design, and install the slide rail 54 with the springs 52 installed at the specified position at the bottom of the test box;

[0070] S2, laying a dense non-woven fabric 14 on the top sheet 51, placing the underground pipe 3 with the joint 2 on the non-woven fabric 14, and adjusting the underground pipe 3 to the position designed in the experiment to match the position of the spring group device 5;

[0071] S3, injecting the prepared geotechnical materials in layers into a test box pre-coated with lubricating grease on all sides, and setting an earth pressure box sensor 1 at a predetermined position;

[0072] S4. After the filling is completed, a load transfer frame 8 is arranged on the top of the geotechnical material according to the required load distribution pattern;

[0073] S5, start the jack 7 to preload, compact the rock and soil materials in the test box, and check that all monitoring instruments are operating normally. After the inspection, unload the load;

[0074] S6, start the jack 7 to start the test, continue to push and read the monitoring data of the earth pressure box sensor 1 and the optical fiber sensor 16 during the whole process until the joint 2 is damaged, and this round of test is finished;

[0075] S7, adjusting the combination type and arrangement position of the spring group devices 5 with different elastic coefficients, repeating S1 to S6, and obtaining the performance data of the underground pipeline joint 2 under various complex formation conditions.

[0076] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0077] 1. In the embodiment of the present invention, the test device can simulate the complex stratum conditions below the underground pipeline 3 and the joint 2 through the spring group device 5, simulate special conditions such as geological defects that are not conducive to the stress of the underground pipeline 3 and the joint 2, and test the mechanical properties of the joint 2 under these conditions.

[0078] 2. In the embodiment of the present invention, the test device has a flexibly configurable test environment, including a load transfer frame 8 that can be adjusted to different types according to different requirements of load type and distribution, geotechnical materials that can be adjusted according to the properties of the formation required by the test, and the properties of the formation below the pipeline can be adjusted by adjusting the elastic coefficient and arrangement position of the spring 52 in the spring group device 5.

[0079] 3. In the embodiment of the present invention, the test device can simulate the actual load transfer process when the pipeline is covered with rock and soil with different characteristics, and takes into account the interaction between the pipe and the soil.

[0080] 4. In the embodiment of the present invention, the test device has the characteristics of being real and comprehensive in simulating and studying the performance of underground pipeline joints, and can provide a strong guarantee for the design of various parameters of underground pipelines and joints.

[0081] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test device for testing the performance of underground pipeline joints, characterized in that: The test device comprises: a test box, a spring assembly device (5), a load transfer frame (8) and a measuring assembly; The spring assembly device (5) comprises: a top plate (51), a spring (52), a slider (53) and a slide rail (54); The top plate (51) is fixed on the top of the spring (52), the slider (53) is fixed on the bottom of the spring (52), and the slider (53) is slidably connected to the slide rail (54); A plurality of slide rails (54) are arranged at the bottom of the test box, a dense non-woven fabric (14) is laid on the top sheet (51), a rock material is placed above the non-woven fabric (14), and an underground pipeline (3) with a joint (2) is buried in the rock material; A crossbeam (6) is arranged above the test box, and the bottom of the crossbeam (6) is connected to a load transfer frame (8) via a jack (7); The measuring assembly comprises: an earth pressure box sensor (1) and an optical fiber sensor (16); The soil pressure box sensor (1) is buried in the rock and soil material; The inner wall of the underground pipeline (3) is provided with a plurality of receiving grooves (15), and the optical fiber sensors (16) are installed in the receiving grooves (15).

2. The test device for testing the performance of underground pipeline joints according to claim 1, characterized in that: The test box comprises: a steel beam (10), a steel column (11), a steel frame (12), tempered glass (4) and a steel plate (13); The steel beams (10) and steel columns (11) are welded to form a frame of the test box. The sides and bottom of the frame are welded with steel frames (12) for reinforcement. Steel plates (13) are installed on the left and right sides of the frame, and tempered glass (4) is installed on the front and back sides.

3. The test device for testing the performance of underground pipeline joints according to claim 1, characterized in that: The crossbeam (6) is installed above the test box via a bracket (9).

4. The test device for testing the performance of underground pipeline joints according to claim 1, characterized in that: The load transfer frame (8) comprises: a first I-beam; The first I-beam is installed at the bottom of the crossbeam (6) via a jack (7).

5. The test device for testing the performance of underground pipeline joints according to claim 1, characterized in that: The load transfer frame (8) comprises: a first I-beam and a plurality of second I-beams; The first I-beam is installed at the bottom of the crossbeam (6) through a jack (7), the second I-beam and the first I-beam extend in directions perpendicular to each other, and the second I-beam is placed on top of the geotechnical material.

6. The test device for testing the performance of underground pipeline joints according to claim 1, characterized in that: The load transfer frame (8) comprises: a first I-beam, a load plate and a plurality of second I-beams; The first I-beam is installed at the bottom of the crossbeam (6) through a jack (7), the second I-beam and the first I-beam extend in directions perpendicular to each other, the load plate is placed on top of the geotechnical material, and the second I-beam is installed on top of the load plate.

7. A test method for testing the performance of underground pipeline joints, characterized in that: The test method comprises the following steps: S1. Select springs (52) with various elastic coefficients, install the springs (52) with the specified elastic coefficients at the specified position of the slide rail (54) through the slider (53) according to the requirements of the experimental design, and install the slide rail (54) with the springs (52) at the specified position at the bottom of the test box; S2, laying a dense non-woven fabric (14) on the top sheet (51), placing the underground pipeline (3) with the joint (2) on the non-woven fabric (14), and adjusting the underground pipeline (3) to the position designed in the experiment to match the position of the spring group device (5); S3, injecting the prepared geotechnical materials in layers into a test box pre-coated with lubricating grease on all sides, and setting an earth pressure box sensor (1) at a predetermined position; S4. After the filling is completed, a load transfer frame (8) is arranged on the top of the rock material according to the required load distribution pattern; S5, start the jack (7) to preload, compact the rock and soil materials in the test box, and check that all monitoring instruments are operating normally. After the inspection, unload the load; S6, start the jack (7) to start the test, continue to push and read the monitoring data of the soil pressure box sensor (1) and the optical fiber sensor (16) during the whole process until the joint (2) is damaged, and this round of test is ended; S7, adjusting the combination type and arrangement position of the spring group devices (5) with different elastic coefficients, repeating S1 to S6, and obtaining performance data of the underground pipeline joint (2) under various complex formation conditions.

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