Damage simulation experiment device for outer protective layer of buried pipe

Abstract

The invention provides a buried pipe outer protective layer damage simulation experiment device, and relates to the technical field of underground pipelines. The buried pipe outer protective layer damage simulation experiment device comprises a mounting frame, a driving assembly, a first filler bin and a second filler bin, the top end of the first filler bin is of an open structure, the top end and the bottom end of the second filler bin are of open structures, and the first filler bin is fixedly mounted on the mounting frame; the second filler bin is detachably mounted at an opening in the top of the first filler bin, and mounting openings are formed in the two opposite sides of the first filler bin; the driving assembly comprises a hydraulic cylinder, the hydraulic cylinder comprises a cylinder body and a piston, the cylinder body is fixedly installed on the installation frame, the piston is used for being connected with the first end of a to-be-tested pipeline, the second end of the to-be-tested pipeline penetrates through the two installation openings in the first filler bin, and the first filler bin and the second filler bin are filled with filler simulating the stratum structure. The invention provides a buried pipe outer protective layer damage simulation experiment device which is high in test efficiency and precision.

Description

Technical Field

[0001] The invention relates to the technical field of underground pipelines, and in particular to a buried pipe outer protective layer damage simulation experimental device. Background Art

[0002] When a buried pipe passes through an underground passage, its outer protective layer is easily damaged by external forces such as stratum wear, scratches, impact, and pressure, which makes the metal body of the pipe directly exposed to the environment and easily corroded. Therefore, before installing the buried pipe, it is necessary to test the damage performance of the outer protective layer of the buried pipe. In the prior art, each performance of the buried pipe protective layer is generally tested one by one in the laboratory. However, this testing method is not only inefficient, but also has large deviations in the test results. Summary of the invention

[0003] In order to solve at least one of the problems mentioned in the background technology, the present invention provides a buried pipe outer protective layer damage simulation experimental device with high testing efficiency and accuracy.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a buried pipe outer protective layer damage simulation experiment device, comprising a mounting frame, a filling bin and a driving assembly, the filling bin comprising a first filling bin and a second filling bin, the volume of the second filling bin is smaller than that of the first filling bin, the top of the first filling bin is an open structure, the top and bottom of the second filling bin are both open structures, the first filling bin is fixedly mounted on the mounting frame, the second filling bin is detachably mounted at the open position of the top of the first filling bin, and the first filling bin has mounting openings on opposite sides along the first direction; The driving assembly includes a hydraulic cylinder, which includes a cylinder body and a piston. The cylinder body is fixedly installed on a mounting frame, one end of the piston is slidably inserted into the cylinder body, and the other end of the piston is used to connect with the first end of the pipeline to be tested. The second end of the pipeline to be tested passes through two mounting ports on the first filling bin. The first filling bin and the second filling bin are filled with fillers simulating the formation structure. The hydraulic cylinder is used to drive the pipeline to be tested to move along a first direction, thereby causing friction between the pipeline to be tested and the filler, wherein the first direction is consistent with the moving direction of the piston.

[0005] As an optional implementation, the two installation openings on the first filling bin are U-shaped openings with the openings facing upward, and the pipeline to be tested is installed from the U-shaped openings.

[0006] As an optional implementation, the first filling bin includes a first baffle and a second baffle, and the first baffle and the second baffle are respectively detachably mounted at two mounting openings on the first filling bin.

[0007] As an optional embodiment, the first filling bin also includes a retaining ring having a connecting hole. The retaining ring is arranged at the installation port and is detachably connected to the first filling bin through the connecting hole. The retaining ring is used to adjust the opening size reserved for the installation port to allow pipes to be tested with different diameters to pass through the installation port.

[0008] As an optional embodiment, the first filling bin has a plurality of slots at the top on both sides opposite to each other along the second direction, and the top of the second filling bin is connected to a plurality of support rods extending laterally, and the support rods are engaged in the slots, so that the second filling bin can be removably installed in the first filling bin, wherein the second direction is perpendicular to the first direction.

[0009] As an optional implementation, along the first direction, the bottoms of the second filling bin on two opposite sides are arc-shaped to match the top of the pipeline to be tested passing through the first filling bin.

[0010] As an optional embodiment, the mounting frame has a first beam and a second beam, the first beam and the second beam extend along the second direction, and the first beam and the second beam are spaced apart along the first direction, the first end of the cylinder body is fixed to the first beam, and the second end of the cylinder body is fixed to the second beam.

[0011] As an optional embodiment, along the first direction, the first beam is located at one end of the mounting frame, the second beam is located between the filling bin and the first beam, and the second beam has a snap ring for fixing the second end of the cylinder body to the second beam.

[0012] As an optional implementation, the drive assembly further includes a clamp, which is connected to an end of the piston away from the cylinder body, and the clamp is used to be connected to one end of the pipeline to be tested.

[0013] As an optional embodiment, the filler includes a filling block with sharp corners, the shape of the filling block matches the second filling bin, and the filling block is filled in the second filling bin so that the sharp corners on the filling block contact the pipe to be tested passing through the first filling bin, thereby testing the scratches of the sharp corners on the filling block on the pipe to be tested.

[0014] The present invention provides a buried pipe outer protective layer damage simulation experiment device, including a mounting frame, a filling bin and a driving assembly, the filling bin including a first filling bin and a second filling bin, the volume of the second filling bin is smaller than that of the first filling bin, the top of the first filling bin is an open structure, the top and bottom of the second filling bin are both open structures, the first filling bin is fixedly mounted on the mounting frame, and the second filling bin is detachably mounted on the open portion of the top of the first filling bin, and along the first direction, the first filling bin has mounting openings on opposite sides thereof; the driving assembly includes a hydraulic cylinder, the hydraulic cylinder including a cylinder body and a piston, the cylinder body is fixedly mounted on the mounting frame, one end of the piston is slidably penetrated in the cylinder body, and the other end of the piston is used to be connected to the first end of the pipeline to be tested, the second end of the pipeline to be tested passes through the two mounting openings on the first filling bin, the first filling bin and the second filling bin are filled with fillers simulating the formation structure, the hydraulic cylinder is used to drive the pipeline to be tested to move along the first direction, so as to cause friction between the pipeline to be tested and the filler, wherein the first direction is consistent with the moving direction of the piston.

[0015] When the buried pipe outer protective layer damage simulation experiment device provided by the present invention is used, the pipeline to be tested can be passed through the installation port on the first filling bin, the piston of the hydraulic cylinder is connected to the pipeline to be tested, and fillers (such as sand and gravel) simulating the stratum structure are filled into the first filling bin and the second filling bin, and then the pipeline to be tested is driven by the hydraulic cylinder to perform reciprocating linear motion, so that friction occurs between the protective layer outside the measuring pipe and the filler to simulate the environment when the buried pipe passes through the underground passage. The damage condition of the outer protective layer of the pipeline to be tested can be obtained by observing the appearance of the outer protective layer of the pipeline to be tested after the experiment. During the test, the environment of the pipeline to be tested can be adjusted by changing the type of filler and the amount of filler to make it closer to the actual stratum environment. Compared with the existing method that requires measuring different properties of the protective layer one by one, the buried pipe outer protective layer damage simulation experiment device provided by the present invention can directly simulate the actual working environment, and the test efficiency is higher and the test results are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the overall structure of a buried pipe outer protective layer damage simulation experimental device provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a driving component in a buried pipe outer protective layer damage simulation experimental device provided by an embodiment of the present invention; Figure 3 for Figure 1 The enlarged view of point A in the middle; Figure 4 for Figure 1 The enlarged view of point B in the middle; Figure 5 A schematic diagram of the first structure of a filling bin in a buried pipe outer protective layer damage simulation experimental device provided by an embodiment of the present invention; Figure 6 A schematic diagram of a second structure of a filling bin in a buried pipe outer protective layer damage simulation experimental device provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of the first filling bin in the buried pipe outer protective layer damage simulation experimental device provided by an embodiment of the present invention; Figure 8 A schematic diagram of the structure of a second filling bin in a buried pipe outer protective layer damage simulation experimental device provided by an embodiment of the present invention; Fig. 9 A schematic diagram of a filling block in a buried pipe outer protective layer damage simulation experimental device provided in an embodiment of the present invention.

[0018] Description of reference numerals: 100-Experimental setup; 110-mounting frame; 111-first crossbeam; 112-second crossbeam; 113-clamp ring; 120-filling bin; 121-first filling chamber; 1211-installation port; 1212-first baffle; 1213-second baffle; 1214-baffle ring; 1215-slot; 122- second filling bin; 1221- support rod; 130- driving assembly; 131-hydraulic cylinder; 1311-cylinder body; 1312-piston; 1313-first oil guide pipe; 1314-second oil guide pipe; 1315-hydraulic oil tank; 132-Clamp; 140-control cabinet; 200-pipeline to be tested; 300 - filler block; X-first direction; Y - Second direction. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0020] In the application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0022] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0024] When a buried pipe passes through an underground passage, its outer protective layer is easily damaged by external forces such as stratum wear, scratches, impact, and pressure, which makes the metal body of the pipe directly exposed to the environment and easily corroded. Therefore, before installing the buried pipe, it is necessary to test the damage performance of the outer protective layer of the buried pipe. In the prior art, each performance of the buried pipe protective layer is generally tested one by one in the laboratory. However, this testing method is not only inefficient, but also has large deviations in the test results.

[0025] You can refer to Figures 1 to 9The embodiment of the present invention provides a buried pipe outer protective layer damage simulation experiment device 100, including a mounting frame 110, a filling bin 120 and a driving assembly 130, the filling bin 120 includes a first filling bin 121 and a second filling bin 122, the volume of the second filling bin 122 is smaller than the first filling bin 121, the top of the first filling bin 121 is an open structure, the top and bottom of the second filling bin 122 are both open structures, the first filling bin 121 is fixedly mounted on the mounting frame 110, and the second filling bin 122 is detachably mounted at the open position at the top of the first filling bin 121, and along the first direction X, the first filling bin 121 has installation openings 1211 on opposite sides; the driving assembly 130 includes a liquid The hydraulic cylinder 131 includes a cylinder body 1311 and a piston 1312. The cylinder body 1311 is fixedly mounted on the mounting frame 110. One end of the piston 1312 is slidably inserted into the cylinder body 1311. The other end of the piston 1312 is used to connect with the first end of the pipeline 200 to be tested. The second end of the pipeline 200 to be tested passes through two mounting ports 1211 on the first filling bin 121. The first filling bin 121 and the second filling bin 122 are filled with fillers simulating the formation structure. The hydraulic cylinder 131 is used to drive the pipeline 200 to be tested to move along the first direction X, so that friction occurs between the pipeline 200 to be tested and the filler, wherein the first direction X is consistent with the moving direction of the piston 1312.

[0026] It can be understood that the pipeline to be tested has a protective layer outside, and the embodiment of the present invention mainly tests the performance of the protective layer.

[0027] When the buried pipe outer protective layer damage simulation experiment device 100 provided by the embodiment of the present invention is used, the pipeline 200 to be tested can be passed through the installation port 1211 on the first filling bin 121, the piston 1312 of the hydraulic cylinder 131 is connected to the pipeline 200 to be tested, and the first filling bin 121 and the second filling bin 122 are filled with fillers (such as sand and gravel) simulating the stratum structure, and then the hydraulic cylinder 131 drives the pipeline 200 to be tested to perform reciprocating linear motion, so that the protective layer outside the measuring pipe and the filler are rubbed to simulate the environment when the buried pipe passes through the underground passage. After the observation experiment, The damage condition of the outer protective layer of the tested pipe 200 can be inferred from its appearance. During the test, the environment of the tested pipe 200 can be adjusted by changing the type of filler and the amount of filler to make it closer to the actual formation environment. In addition, the second filling bin 122 can be used to fix some larger block fillers to further simulate the actual environment. Compared with the existing method that requires measuring different properties of the protective layer one by one, the buried pipe outer protective layer damage simulation experimental device 100 provided in the embodiment of the present invention can directly simulate the actual working environment, with higher test efficiency and more accurate test results.

[0028] In the above embodiment, the two installation openings 1211 on the first filling bin 121 may be U-shaped openings opening upward, so that the pipeline 200 to be tested can be conveniently installed in the filling bin 120 from above through the U-shaped openings.

[0029] In the above embodiment, the first filling bin 121 may include a first baffle 1212 and a second baffle 1213, and the first baffle 1212 and the second baffle 1213 are respectively detachably installed at two installation ports 1211 on the first filling bin 121. Before installing the pipe 200 to be tested, the first baffle 1212 and the second baffle 1213 can be first removed from the two installation ports 1211, and then the pipe 200 to be tested is placed into the installation port 1211 from above the filling bin 120, and then the first baffle 1212 and the second baffle 1213 are respectively installed at the two installation ports 1211. By setting the baffle, a portion of the installation port 1211 can be covered after the pipe 200 to be tested is installed at the installation port 1211, so as to prevent the filler in the filling bin 120 from overflowing from the installation port 1211. Specifically, the first baffle 1212 and the second baffle 1213 can be slidably engaged with the edge of the installation opening 1211. When disassembling, the first baffle 1212 and the second baffle 1213 only need to be pulled out upwards, and when installing, they can be pushed downwards, which is very convenient to operate. It should be noted that the lower ends of the first baffle 1212 and the second baffle 1213 are arc-shaped, which can be spliced ​​with the bottom of the installation opening 1211 of the U-shaped structure to form a circular installation opening 1211, thereby matching the shape of the pipeline 200 to be tested.

[0030] In the above embodiment, the first filling bin 121 may further include a retaining ring 1214 having a connecting hole. The retaining ring 1214 is disposed at the installation port 1211 and is detachably connected to the first filling bin 121 through the connecting hole. The retaining ring 1214 is used to adjust the size of the opening reserved by the installation port 1211 to allow the tested pipe 200 of different diameters to pass through the installation port 1211. It can be understood that when it is necessary to test pipes of different diameters, if the diameter of the pipe to be tested 200 is too small compared to the installation port 1211, a large gap will be left between the pipe to be tested 200 and the installation port 1211 after the pipe to be tested passes through the installation port 1211, and the filler in the filling bin 120 may overflow from these gaps, thereby reducing the accuracy of the detection. In this embodiment, a suitable retaining ring 1214 can be installed at the installation port 1211. The retaining ring 1214 can block a portion of the gap between the pipe to be tested 200 and the installation port 1211, thereby preventing the filler from overflowing from the gap into the filling bin 120.

[0031] In the above embodiment, the top of the first filling bin 121 on both sides opposite to each other along the second direction Y may have a plurality of slots 1215, and the top of the second filling bin 122 is connected with a plurality of support rods 1221 extending laterally, and the support rods 1221 are engaged in the slots 1215, so that the second filling bin 122 can be detachably installed in the first filling bin 121, wherein the second direction Y is perpendicular to the first direction X. Specifically, two slots 1215 may be respectively provided on both sides opposite to each other at the top of the first filling bin 121, and a support rod 1221 may be connected to each of the four corners at the top of the second filling bin 122, and the four support rods 1221 are respectively engaged in the four slots 1215, so as to ensure that the second filling bin 122 is stably installed on the first filling bin 121, and since the length direction of the support rods 1221 is perpendicular to the moving direction of the piston 1312 of the hydraulic cylinder 131, this installation method is not only convenient and reliable, but also can prevent the second filling bin 122 from shaking when the pipeline 200 to be tested moves.

[0032] In the above embodiment, along the first direction X, the bottoms of the second filling bin 122 on the opposite sides can be made arc-shaped to match the top of the pipe to be tested 200 passing through the first filling bin 121. In this way, the bottom of the second filling bin can be conveniently avoided from the bottom of the pipe to be tested 200 passing through, so as to avoid the pipe to be tested 200 rubbing against the second filling bin 122 when moving.

[0033] In the above embodiment, the mounting frame 110 may have a first beam 111 and a second beam 112, the first beam 111 and the second beam 112 extend along the second direction Y, and the first beam 111 and the second beam 112 are spaced apart along the first direction X, the first end of the cylinder body 1311 is fixed to the first beam 111, and the second end of the cylinder body 1311 is fixed to the second beam 112.

[0034] In the above embodiment, along the first direction X, the first crossbeam 111 may be located at one end of the mounting frame 110, the second crossbeam 112 is located between the filling bin 120 and the first crossbeam 111, and the second crossbeam 112 has a snap ring 113, which is used to fix the second end of the cylinder 1311 to the second crossbeam 112. Specifically, the first end of the cylinder 1311 may be detachably connected to the first crossbeam 111, and the second end of the cylinder 1311 passes through the snap ring 113 and is tightened by the snap ring 113 to prevent left and right shaking. This installation method is convenient for disassembly and maintenance.

[0035] In the above embodiment, the driving assembly 130 may further include a clamp 132, which is connected to one end of the piston 1312 away from the cylinder body 1311. The clamp 132 is used to be connected to one end of the pipeline 200 to be tested. The clamp 132 is used to be fixedly connected to the pipeline 200 to be tested, so that the pipeline 200 to be tested is driven to reciprocate through the piston 1312. Specifically, the clamp 132 has an outer shape of a claw structure, and the claw locks the outer wall of the pipeline 200 to be tested. The claw has a threaded hole. At the same time, a threaded hole corresponding to the threaded hole on the claw can also be opened on the outer wall of one end of the pipeline 200 to be tested, and the claw and the pipeline 200 to be tested can be threadedly connected together by bolts to improve the firmness of the connection between the clamp 132 and the pipeline 200 to be tested.

[0036] In the above embodiment, the filler may include a filling block 300 with a sharp corner, the shape of the filling block 300 matches the second filling bin 122, and the filling block 300 is filled in the second filling bin 122 so that the sharp corner on the filling block 300 contacts the pipeline 200 to be tested that passes through the first filling bin 121, thereby testing the scratches of the sharp corner on the filling block 300 on the pipeline 200 to be tested. Specifically, the overall shape of the second filling bin 122 and the filling block 300 may be a rectangular parallelepiped structure, the filling block 300 may be filled into the second filling bin 122, and the sharp corner on the filling block 300 may face downward, thereby contacting the outer wall of the pipeline 200 to be tested that passes through the first filling bin 121, so that the filling block 300 can be quickly installed in the second filling bin 122, and the installation is stable and will not easily shake, thereby ensuring stable friction between the sharp corner and the pipeline 200 to be tested. In addition, the actual formation environment can be further simulated by changing the angle and shape of the sharp corner.

[0037] The hydraulic cylinder 131 may further include a first oil pipe 1313, a second oil pipe 1314 and a hydraulic oil tank 1315. One end of the first oil pipe 1313 and the second oil pipe 1314 are connected to the cylinder body 1311 of the hydraulic cylinder 131, and the other end is connected to the hydraulic oil tank 1315. Hydraulic oil is introduced into the cylinder body 1311 through the hydraulic oil tank 1315, thereby driving the piston 1312 to move. In addition, a control cabinet 140 may be provided. The control cabinet 140 is connected to the hydraulic cylinder, and the experimenter can control the movement of the hydraulic cylinder 131 through the control cabinet 140.

[0038] The buried pipe outer protective layer damage simulation experimental device 100 provided by the embodiment of the present invention includes a mounting frame 110, a filling bin 120 and a driving assembly 130, the filling bin 120 includes a first filling bin 121 and a second filling bin 122, the volume of the second filling bin 122 is smaller than the first filling bin 121, the top of the first filling bin 121 is an open structure, the top and bottom of the second filling bin 122 are both open structures, the first filling bin 121 is fixedly mounted on the mounting frame 110, and the second filling bin 122 is detachably mounted at the open position at the top of the first filling bin 121, and along the first direction X, the first filling bin 121 has mounting openings 1211 on opposite sides; the driving assembly 130 includes a hydraulic Cylinder 131, the hydraulic cylinder 131 includes a cylinder body 1311 and a piston 1312, the cylinder body 1311 is fixedly installed on the mounting frame 110, one end of the piston 1312 is slidably inserted into the cylinder body 1311, and the other end of the piston 1312 is used to connect with the first end of the pipeline 200 to be tested, and the second end of the pipeline 200 to be tested passes through the two mounting ports 1211 on the first filling bin 121, and the first filling bin 121 and the second filling bin 122 are filled with fillers simulating the formation structure, and the hydraulic cylinder 131 is used to drive the pipeline 200 to be tested to move along the first direction X, so as to cause friction between the pipeline 200 to be tested and the filler, wherein the first direction X is consistent with the moving direction of the piston 1312.

[0039] When the buried pipe outer protective layer damage simulation experiment device 100 provided by the embodiment of the present invention is used, the pipeline 200 to be tested can be passed through the installation port 1211 on the first filling bin 121, the piston 1312 of the hydraulic cylinder 131 is connected to the pipeline 200 to be tested, and fillers (such as sand and gravel) simulating the stratum structure are filled into the first filling bin 121 and the second filling bin 122, and then the pipeline 200 to be tested is driven by the hydraulic cylinder 131 to perform reciprocating linear motion, so that the protective layer outside the measuring pipe and the filler are rubbed to simulate the environment when the buried pipe passes through the underground passage. The damage condition of the outer protective layer of the pipeline 200 to be tested can be obtained by observing the appearance of the outer protective layer of the pipeline 200 to be tested after the experiment. During the test, the environment of the pipeline 200 to be tested can be adjusted by changing the type of filler and the amount of filler to make it closer to the actual stratum environment. Compared with the existing method that requires measuring different properties of the protective layer one by one, the buried pipe outer protective layer damage simulation experiment device 100 provided by the embodiment of the present invention can directly simulate the actual working environment, and the test efficiency is higher and the test results are more accurate.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A buried pipe outer protective layer damage simulation experimental device, characterized in that: The invention comprises a mounting frame, a filling bin and a driving assembly, wherein the filling bin comprises a first filling bin and a second filling bin, wherein the volume of the second filling bin is smaller than that of the first filling bin, the top of the first filling bin is an open structure, and the top and bottom of the second filling bin are both open structures, the first filling bin is fixedly mounted on the mounting frame, and the second filling bin is detachably mounted on the open portion of the top of the first filling bin, and the first filling bin has mounting openings on opposite sides along the first direction; The driving assembly includes a hydraulic cylinder, which includes a cylinder body and a piston. The cylinder body is fixedly installed on the mounting frame. One end of the piston is slidably inserted into the cylinder body. The other end of the piston is used to connect with the first end of the pipeline to be tested. The second end of the pipeline to be tested passes through the two mounting ports on the first filling bin. The first filling bin and the second filling bin are filled with fillers that simulate the formation structure. The hydraulic cylinder is used to drive the pipeline to be tested to move along the first direction, so as to cause friction between the pipeline to be tested and the filler, wherein the first direction is consistent with the moving direction of the piston.

2. The buried pipe outer protective layer damage simulation experimental device according to claim 1 is characterized in that: The two installation openings on the first filling bin are U-shaped openings opening upward, and the pipeline to be tested is installed from the U-shaped openings.

3. The buried pipe outer protective layer damage simulation experimental device according to claim 2 is characterized in that: The first filling bin includes a first baffle and a second baffle, and the first baffle and the second baffle are respectively detachably mounted at two mounting openings on the first filling bin.

4. The buried pipe outer protective layer damage simulation experimental device according to claim 3 is characterized in that: The first filling bin also includes a retaining ring having a connecting hole. The retaining ring is arranged at the installation port and is detachably connected to the first filling bin through the connecting hole. The retaining ring is used to adjust the size of the opening reserved for the installation port to allow pipes to be tested with different diameters to pass through the installation port.

5. The buried pipe outer protective layer damage simulation experimental device according to claim 4 is characterized in that: The first filling bin has a plurality of slots at the top on both sides opposite to each other along the second direction, and the top of the second filling bin is connected to a plurality of support rods extending laterally, and the support rods are engaged in the slots, so that the second filling bin can be removably installed in the first filling bin, wherein the second direction is perpendicular to the first direction.

6. The buried pipe outer protective layer damage simulation experimental device according to claim 5 is characterized in that: Along the first direction, the bottoms of the second filling bin at two opposite sides are in arc shape to match the top of the pipeline to be tested passing through the first filling bin.

7. The buried pipe outer protective layer damage simulation experimental device according to claim 6 is characterized in that: The mounting frame has a first beam and a second beam, the first beam and the second beam extend along the second direction, and the first beam and the second beam are spaced apart along the first direction, the first end of the cylinder body is fixed to the first beam, and the second end of the cylinder body is fixed to the second beam.

8. The buried pipe outer protective layer damage simulation experimental device according to claim 7 is characterized in that: Along the first direction, the first beam is located at one end of the mounting frame, the second beam is located between the filling bin and the first beam, and the second beam has a clamping ring, which is used to fix the second end of the cylinder body to the second beam.

9. The buried pipe outer protective layer damage simulation experimental device according to claim 8 is characterized in that: The driving assembly further comprises a clamp, which is connected to an end of the piston away from the cylinder body, and is used to be connected to one end of the pipeline to be tested.

10. The buried pipe outer protective layer damage simulation experimental device according to claim 9, characterized in that: The filler includes a filling block with sharp corners, the shape of the filling block matches the second filling bin, and the filling block is filled in the second filling bin so that the sharp corners on the filling block contact the pipeline to be tested passing through the first filling bin, thereby testing the scratches of the sharp corners on the filling block on the pipeline to be tested.

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