Pipe-soil interaction simulation test device

Abstract

The invention discloses a simulation test device for pipe-soil interaction. The simulation test device comprises a base; foundation tables are arranged in the test box body, two movable door plates are arranged between the two foundation tables in the length direction of the side plates, the driving mechanism is connected with the two movable door plates, first pressure sensors are arranged at the bottoms of the movable door plates, the test box body is filled with sandy soil from the top, and a pipeline is buried in the sandy soil; a displacement sensor is arranged at the top of the sandy soil; a pull pressure sensor is arranged between the driving mechanism and the movable door plate; and the monitoring device is electrically connected with the first pressure sensor, the displacement sensor and the pull pressure sensor. The device can be widely applied to research on interaction of the underground pipeline and the soil body, researchers can accurately obtain stress states, deformation characteristics and response of the soil body of the pipeline under different subsidence conditions, and a scientific basis is provided for design and safety evaluation of the underground pipeline; powerful support is provided for research in the fields of soil mechanics, geotechnical engineering, pipeline engineering and the like.

Description

Technical Field

[0001] The invention relates to the technical field of pipe-soil interaction simulation test devices, and in particular to a pipe-soil interaction simulation test device. Background Art

[0002] As an important part of urban infrastructure construction, buried pipeline projects undertake the key task of transporting water, gas, oil and other resources. With the acceleration of urbanization, problems such as groundwater precipitation, pipeline leakage and foundation settlement have gradually become the main factors affecting the stability of buried pipelines. Local foundation settlement may cause the pipeline to bend, sink or hang in the air due to soil loss, deformation or collapse, which may lead to pipeline instability, deformation or rupture, which may endanger public safety in severe cases. Especially when the pipeline diameter is large, the pressure inside the pipe is high and the buried depth is shallow, the soil pressure on the pipeline at different positions is significantly different. Local foundation settlement is more likely to cause uneven stress and deformation of the pipeline, which is very likely to cause pipeline rupture or overall instability. Therefore, studying the interaction between buried pipelines and soil, especially the bearing capacity and deformation behavior of pipelines under the situation of local foundation settlement, is of great significance for ensuring the safety of urban infrastructure and optimizing pipeline design and repair strategies.

[0003] Existing technologies have significant limitations in the study of simulating the impact of foundation subsidence on buried pipelines, mainly manifested in the limitations of subsidence simulation, insufficient research on the relationship between soil deformation and pipeline bearing capacity, incomplete analysis of pipe-soil interaction, and lack of precise measurement technology. These problems limit the in-depth understanding and accurate prediction of the bearing capacity and deformation behavior of pipelines under foundation subsidence. Summary of the invention

[0004] The purpose of the present invention is to provide a pipe-soil interaction simulation test device to solve the limitations of sand settlement simulation in the existing background technology, insufficient research on the relationship between soil deformation and pipeline bearing capacity, and incomplete analysis of pipe-soil interaction, which makes it impossible to accurately analyze and understand the bearing capacity and deformation behavior of the pipeline under foundation settlement.

[0005] To achieve one of the above-mentioned purposes, an embodiment of the present invention provides a pipe-soil interaction simulation test device, the device comprising: a base, a driving mechanism is disposed at the bottom of the base;

[0006] A test box, which is mounted on the base and has a cubic structure and two opposite side panels;

[0007] The test box is provided with base platforms near the two side panels, two movable door panels are provided between the two base platforms along the length direction of the side panels, the driving mechanism is connected to the two movable door panels, a first pressure sensor is provided at the bottom of the movable door panel, the test box is filled with sand from the top, and a pipeline is buried in the sand, a displacement sensor is provided on the top of the sand, and a tension pressure sensor is provided between the driving mechanism and the movable door panel;

[0008] A monitoring device is electrically connected to the first pressure sensor, the displacement sensor and the tension and pressure sensor. When the driving mechanism drives one of the movable door panels to move along the height direction of the test box, the monitoring device collects data from the first pressure sensor, the displacement sensor and the tension and pressure sensor to obtain pipe-soil interaction information and displacement information of the movable door panel.

[0009] As a further improvement of the present invention, the device also includes: the monitoring device includes a data acquisition module, a data analysis module and a camera module, the data acquisition module is electrically connected to the data analysis module, the data acquisition module is also electrically connected to the first pressure sensor, the displacement sensor and the tensile pressure sensor, the monitoring device also includes a camera module, the camera module is used to capture images at set intervals and transmit them to the data analysis module when the driving mechanism drives one of the movable door panels to move along the height direction of the test box.

[0010] As a further improvement of the present invention, the device further comprises: a pressing plate is further provided in the test box body corresponding to the two side plates, and the two pressing plates are respectively matched with the corresponding two side plates;

[0011] The simulation test device also includes linear drive mechanisms respectively installed on the outside of the two side plates, two linear drive mechanisms are correspondingly arranged at one side plate, the two linear drive mechanisms both pass through the side plates and respectively cooperate to connect the first drive position and the second drive position on the pressing plate, the first drive position and the second drive position are arranged on the surface of the pressing plate and up and down in the vertical direction, and the linear drive mechanism is used to drive the pressing plate to move;

[0012] Two first clamping assemblies are arranged on one side of the side plate facing the pressure plate. The two first clamping assemblies are arranged up and down in a vertical direction. The first clamping assemblies are used for clamping and connecting the pressure plate when the pressure plate is close to the side plate.

[0013] As a further improvement of the present invention, the device further includes: the first clamping assembly includes a fixing block symmetrically mounted on the side plate, a groove is recessed on the fixing block, the first clamping assembly also includes a round shaft, two ends of the round shaft have connecting plates, the connecting plates are correspondingly mounted in the grooves and connected to the bottom of the grooves through a first spring, the round shaft also has a fixing portion, the fixing portion is located on the side facing away from the pressure plate and is extended toward the fixing portion, and a clamping block is provided at the bottom of the fixing portion;

[0014] A contact block is arranged on one side of the pressing plate facing the side plate, and a side of the contact block facing the circular shaft is an inclined surface. A circular shaft groove and a fixed block groove are also arranged on one side of the pressing plate facing the side plate. The circular shaft groove and the fixed block groove are connected, and the circular shaft groove corresponds to the circular shaft, and the fixed block groove corresponds to the fixed block.

[0015] When the pressing plate moves toward the side plate, the inclined surface of the abutting block abuts against the circular shaft and moves downward until it is embedded in the circular shaft groove, the fixing block is inserted into the fixing block groove, and the clamping block at the bottom of the fixing part is prompted to clamp the pressing plate.

[0016] As a further improvement of the present invention, the device further comprises: a receiving groove is recessed at the bottom of the fixing portion, and the engaging block is located in the receiving groove and connected to the receiving groove via a second spring.

[0017] As a further improvement of the present invention, the device further comprises: a round tube is provided at the first driving position and the second driving position on the pressing plate, and the engaging block moves downward and is inserted into the round tube to engage the pressing plate;

[0018] The simulation test device also includes a connecting tube, one end of which passes through the side plate threadedly connected to the round tube, and a linear drive mechanism is connected to the other end of the connecting tube. The linear drive mechanism is connected to the pressure plate through the connecting tube and drives the pressure plate to move; the connecting tube is also used to unlock the engagement between the locking block and the round tube.

[0019] As a further improvement of the present invention, the device also includes: a through groove is opened on one side of the round tube facing the round shaft groove, and the locking block moves downward and is inserted into the through groove to lock the pressure plate. When the locking block is inserted into the through groove, the round shaft is embedded in the round shaft groove.

[0020] As a further improvement of the present invention, the device further comprises: an unlocking shaft is coaxially arranged in the circular tube, the end of the unlocking shaft is connected to the plate surface of the pressure plate through a third spring, an unlocking block is arranged on the unlocking shaft protruding toward the through slot, the unlocking block extends out of the through slot, the unlocking block cooperates with the engaging block, and a side of the engaging block facing the unlocking block is arranged as an inclined surface;

[0021] When the locking block is inserted into the through slot to lock the pressure plate, the connecting tube drives the unlocking shaft to move away from the pressure plate, driving the unlocking block to move toward the locking block, and the unlocking block abuts against the inclined surface of the locking block and drives the locking block to move upward to leave the through slot;

[0022] When the unlocking block abuts against the engaging block so that the engaging block is located outside the through slot, the connecting tube drives the unlocking shaft to move toward the pressure plate, so that the unlocking block is disengaged from the engaging block, and the engaging block falls downward into the through slot to engage the round tube.

[0023] As a further improvement of the present invention, the device further comprises: the unlocking shaft surface has a first thread, the inner surface of the round tube has a second thread, the outer surface of the connecting tube has a third thread matched with the second thread, and the inner surface has a fourth thread matched with the first thread; the pitch of the first thread is greater than the pitch of the second thread;

[0024] The connecting tube is inserted between the unlocking shaft and the round tube. When the connecting tube is spirally connected, the connecting tube moves toward the pressure plate, the unlocking shaft moves away from the pressure plate, and the moving step of the connecting tube is smaller than the moving step of the unlocking shaft.

[0025] As a further improvement of the present invention, the device further includes: a plurality of second pressure sensors are arranged on the side of the pressing plate away from the linear drive mechanism, and the data acquisition module is electrically connected to the second pressure sensors for collecting pressure information between the pressing plate and the sand.

[0026] Compared with the prior art, the present invention has the following beneficial effects: the device can be widely used in the study of the interaction between underground pipelines and soil, especially in the analysis of the influence of foundation settlement on buried pipelines. Through the experimental device, researchers can accurately obtain the stress state, deformation characteristics and soil response of the pipeline under different settlement conditions, provide a scientific basis for the design and safety assessment of underground pipelines, and provide strong support for the research in the fields of soil mechanics, geotechnical engineering and pipeline engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of a simulation test device in one embodiment of the present invention.

[0028] Figure 2 It is a system connection diagram of a simulation test device in one embodiment of the present invention.

[0029] Figure 3 1 is a structural diagram of a side plate and a pressure plate in one embodiment of the present invention.

[0030] Figure 4 It is a structural diagram of the first engaging component on the side plate in one embodiment of the present invention.

[0031] Figure 5 It is a diagram of a circular tube structure in one embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of unlocking the engaging block after the connecting tube is pushed forward in one embodiment of the present invention.

[0033] Figure 7Schematic diagram of the engagement block being inserted into the through slot when the connecting pipe is withdrawn in one embodiment of the present invention

[0034] Description of reference numerals:

[0035] Base 1; driving mechanism 11; test box 2; side panel 21; base platform 22; movable door panel 23; first pressure sensor A; pipeline 3; displacement sensor B; tension pressure sensor C; monitoring device 4; data acquisition module 41; data analysis module 42; camera module 43; pressing plate 5; abutment block 51; circular shaft groove 52; fixed block groove 53; first clamping assembly 6; fixed block 61; groove 62; circular shaft 63; fixing part 631; clamping block 632; accommodating groove 633; ​​second spring 634; first spring 64; circular tube 7; through groove 71; unlocking shaft 72; unlocking block 73; third spring 74; connecting tube 8; second pressure sensor D; linear driving mechanism 9. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0037] In one embodiment of the present invention, a pipe-soil interaction simulation test device is provided. The simulation test device can be used to simulate the interaction of the pipe 3 in the sand and soil, and monitor the pressure information generated by the pipe-soil interaction in real time. Moreover, the simulation test device can also simulate the pressure information generated by the pipe-soil interaction during low-level collapse.

[0038] In one embodiment, the pipeline 3 is a PVC pipe.

[0039] like Figure 1 As shown, the pipe-soil interaction simulation test device comprises a base 1, a test box 2 and a monitoring device 4. A driving mechanism 11 is provided at the bottom of the base 1. The test box 2 is mounted on the base 1 and is a cubic structure with two opposite side panels 21. The driving mechanism 11 is connected upwardly to the test box 2 on the base 1.

[0040] The driving mechanism 11 includes a motor, a reducer, and a driving shaft, and provides a power source to the test box 2 through the operation of the motor.

[0041] The test box 2 is provided with base platforms 22 near the two side panels 21 , respectively. Two movable door panels 23 are provided between the two base platforms 22 along the length direction of the side panels 21 .

[0042] The base platform 22 and the movable door plate 23 are used to carry sand and soil in the test box 2. The base platform 22 is made of an acrylic plate.

[0043] The driving mechanism 11 is respectively connected to two movable door panels 23, a first pressure sensor A is arranged at the bottom of the movable door panels 23, the test box 2 is filled with sand from the top, and a pipeline 3 is buried in the sand, a displacement sensor B is arranged on the top of the sand, and a tension pressure sensor C is arranged between the driving mechanism 11 and the movable door panels 23.

[0044] The driving mechanism 11 can drive the two movable door panels 23 to move respectively. In actual operation, one movable door panel 23 is kept fixed and the other movable door panel 23 is driven to move downward to simulate foundation collapse. At this time, the sand will collapse downward to exert pressure on the pipeline 3.

[0045] The tension pressure sensor C is used to monitor the movement of the movable door plate 23, and the first pressure sensor A is used to monitor the pressure of the sand on the movable door plate 23. If there are multiple first pressure sensors A, the pressure of each point on the movable door plate 23 can be monitored. The displacement sensor B is used to monitor the displacement information of the sand surface.

[0046] The buried operation of the pipeline 3 is to first pour sand and soil from the top of the test box 2 downwards, put the pipeline 3 in when it reaches a preset horizontal position, and then continue to pour sand and soil downwards. It should be noted that the top of the test box 2 can be opened. A valve for discharging sand and soil can also be set at the bottom of the test box 2.

[0047] like Figure 2 As shown, it also includes a monitoring device 4, which is electrically connected to the first pressure sensor A, the displacement sensor B and the tension and pressure sensor C. When the driving mechanism 11 drives one of the movable door panels 23 to move along the height direction of the test box 2, the monitoring device 4 collects data from the first pressure sensor A, the displacement sensor B and the tension and pressure sensor C to obtain pipe-soil interaction information and displacement information of the movable door panel 23.

[0048] Furthermore, the monitoring device 4 includes a data acquisition module 41, a data analysis module 42 and a camera module 43. The data acquisition module 41 is electrically connected to the data analysis module 42. The data acquisition module 41 is also electrically connected to the first pressure sensor A, the displacement sensor B and the tension pressure sensor C. The monitoring device 4 also includes a camera module 43. The camera module 43 is used to capture images at set intervals and transmit them to the data analysis module 42 when the driving mechanism 11 drives one of the movable door panels 23 to move along the height direction of the test box 2.

[0049] The data analysis module 42 can calculate the pressure change between the pipeline 3 and the sand. The monitoring device 4 includes a host computer for displaying the data collected by the first pressure sensor A, the displacement sensor B and the tension pressure sensor C and the pressure change data.

[0050] In one embodiment, the first pressure sensor A uses a HYLF-010-2 spoke-type tension pressure sensor, which has high precision and fatigue resistance, a measuring range of 0 to 30 kg, and an accuracy of 0.03%. The accuracy and reliability of the sensor can meet the sensitive detection requirements for small force changes during the test. The camera module 43 uses a camera model SONY-A7M2 with an effective pixel of 24.2 million. A single pixel of each photo in the test represents an accuracy of about 0.012 mm. The shooting interval is set to 2 seconds, and the total test duration is 120 seconds. The camera module 43 is located directly in front of the test box 2, and the position is fixed by fixing the tripod. During the test, a fixed time interval shooting mode is set to continuously shoot the deformation of the soil during the test. In order to ensure the uniformity and stability of the shooting light source during the test, two fog lights and two LED fill lights are symmetrically arranged in front of the test box 2.

[0051] The camera module 43 can upload the captured photos or videos to the host computer through the data acquisition module 41. The subtle changes of the sand and soil during the settlement process can be observed and recorded.

[0052] In this embodiment, the simulation test is carried out using the following steps:

[0053] (1) Use artificial rain method to fill sand from the top of the test box 2 to the inside, ensure that the sand reaches a high density, fill to the buried height of the pipeline 3, level the top, put the pipeline 3, and continue to fill sand until the required height of the test is reached.

[0054] (2) The data lines of each sensor are led out and connected to the data acquisition module 41. One end of the data acquisition module 41 is connected to the data analysis module 42, and the data analysis module 42 is then connected to the host computer.

[0055] (3) Cover the test box 2 with an opaque black cloth to prevent other light sources from affecting the image acquisition effect.

[0056] (4) Build a tripod to fix the camera module 43, set the shooting interval and shooting time, and adjust the position of the LED fill light to ensure uniform light source.

[0057] (5) The driving mechanism 11 is adjusted according to the experimental requirements to control the displacement mode and the descending speed of the movable door panel 23.

[0058] (6) Start the data acquisition software on the host computer, set the load acquisition frequency to 8 Hz / s, and start the test after the monitoring signal stabilizes.

[0059] (7) The motor is adjusted to move at a rate of 0.05 mm / s, and the shutter of the digital camera, i.e., the camera module 43, is pressed synchronously to take a photo.

[0060] (8) When the displacement of the movable door panel 23 reaches 15 mm, the motor is stopped and the test is terminated.

[0061] In another embodiment of the present invention, based on the pipe-soil interaction simulation test device provided in the previous embodiment, it is also possible to simulate the pressure situation of the pipeline 3 being subjected to buildings on both sides when it is in the sand, that is, it is possible to simulate not only the collapse of the foundation, but also the situation in which structures such as buildings and walls in some buildings or walls are tilted toward the side of the pipeline 3, or directly move toward the side of the pipeline 3, and monitor the interaction force information of the pipeline 3 in the sand in real time during these situations.

[0062] Specifically, Figure 3 and Figure 4 As shown, a pressure plate 5 is further provided in the test box 2 corresponding to the two side panels 21, and the two pressure plates 5 are respectively matched with the corresponding two side panels 21; the matching here means that the pressure plate 5 can be connected to the side panels 21 to achieve fixed placement, and after the pressure plate 5 and the side panels 21 are unlocked, the pressure plate 5 is separated from the side panels 21, and the pressure plate 5 can move in the test box 2, and the linear drive mechanism 9 can drive the pressure plate 5 to apply pressure to the pipeline 3.

[0063] The simulation test device further includes linear drive mechanisms 9 respectively installed on the outer sides of the two side plates 21 . Two linear drive mechanisms 9 are correspondingly arranged at one side plate 21 , and the two linear drive mechanisms 9 are arranged up and down.

[0064] Both linear drive mechanisms 9 pass through the side plate 21 and respectively cooperate with the first drive position and the second drive position on the pressure plate 5. The first drive position and the second drive position are arranged on the surface of the pressure plate 5 and up and down in the vertical direction. The linear drive mechanism 9 is used to drive the pressure plate 5 to move.

[0065] The first driving position and the second driving position represent the points when the linear driving mechanism 9 is connected to the pressing plate 5 , that is, the force application positions where the driving force is applied.

[0066] The purpose of setting the first driving position and the second driving position on a pressing plate 5 and driving it by two linear driving mechanisms 9 is that the two linear driving mechanisms 9 push the pressing plate 5 at the upper and lower positions at the same time to make the pressing plate 5 more evenly stressed and move more stably.

[0067] Of course, if one linear drive mechanism 9 is stationary and the other linear drive mechanism 9 pushes the pressure plate 5, then since the first drive position and the second drive position are not set at the center of the pressure plate 5, the pressure plate 5 can be tilted and displaced, thereby simulating the effect of the tilt displacement of the building structure near the pipeline 3 on the interaction force between the pipe and the soil.

[0068] In this way, the pressing plate 5 can simulate multiple modes, providing greater help to the reliability of the test data.

[0069] Two first clamping assemblies 6 are disposed on one side of the side plate 21 facing the pressing plate 5 . The two first clamping assemblies 6 are disposed up and down in a vertical direction. The first clamping assemblies 6 are used to clamp and connect the pressing plate 5 when the pressing plate 5 is close to the side plate 21 .

[0070] Since the pressure plate 5 has two driving positions, namely the first driving position and the second driving position, one pressure plate 5 is connected to two linear drive mechanisms 9. Therefore, when the pressure plate 5 is stored close to the side plate 21, it is necessary to lock the pressure plate 5 through two first locking components 6. It can be understood that the connection between the pressure plate 5 and the two linear drive mechanisms 9 is locked to avoid the linear drive mechanism 9 accidentally operating one of the driving positions of the pressure plate 5 when no test is needed, causing damage to the pressure plate 5.

[0071] Furthermore, the pressing plate 5 is provided with a plurality of second pressure sensors D on a side facing away from the linear drive mechanism 9 , and the data acquisition module 41 is electrically connected to the second pressure sensors D for collecting pressure information between the pressing plate 5 and the sand.

[0072] In one embodiment, the first engaging assembly 6 comprises a fixing block 61 symmetrically mounted on the side plate 21, and a groove 62 is recessed on the fixing block 61. Specifically, there are two fixing blocks 61 in the first engaging assembly 6, and the grooves 62 on opposite sides of the two fixing blocks 61 are connected through.

[0073] The first engaging assembly 6 further includes a circular shaft 63, with connecting plates at both ends of the circular shaft 63, the circular shaft 63 is between the two fixing blocks 61, the connecting plates are correspondingly installed in the groove 62 and connected to the bottom of the groove 62 through the first spring 64. In this way, the circular shaft 63 can move up and down.

[0074] The circular shaft 63 also has a fixing portion 631, which is located on the side facing away from the pressure plate 5 and extends toward the bottom. A locking block 632 is provided at the bottom of the fixing portion 631. When the circular shaft 63 moves up and down, the fixing portion 631 also moves up and down. The fixing portion 631 can be a cubic structure, and the locking block 632 is also a cubic structure. The locking block 632 is located at the bottom of the locking block 632 and moves up and down.

[0075] The bottom of the fixing portion 631 is recessed to form a receiving groove 633 . The engaging block 632 is located in the receiving groove 633 and connected to the receiving groove 633 via a second spring 634 .

[0076] The size of the engaging block 632 matches that of the receiving groove 633. In one embodiment, the engaging block 632 may be provided with a limit block, and limit grooves are provided on both sides of the receiving groove 633. The limit blocks are embedded in the limit grooves to make the engaging block 632 more stable when moving.

[0077] The side of the pressing plate 5 facing the side plate 21 is provided with an abutment block 51. In one embodiment, the side profile of the abutment block 51 is triangular. The side of the abutment block 51 facing the circular shaft 63 is an inclined surface. The side of the pressing plate 5 facing the side plate 21 is also provided with a circular shaft groove 52 and a fixed block groove 53. The circular shaft groove 52 and the fixed block groove 53 are connected, and the circular shaft groove 52 corresponds to the circular shaft 63, and the fixed block groove 53 corresponds to the fixed block 61; the circular shaft groove 52 is located below the abutment block 51. The fixed block grooves 53 are located at both ends of the circular shaft groove 52.

[0078] When the pressing plate 5 moves toward the side plate 21, the inclined surface of the abutting block 51 abuts against the circular shaft 63 and moves downward until it is embedded in the circular shaft groove 52, and the fixing block 61 is inserted into the fixing block groove 53, and the engaging block 632 at the bottom of the fixing portion 631 engages with the pressing plate 5. Since the circular shaft 63 can move up and down, the inclined surface of the pressing plate 5 gradually drives the circular shaft 63 to gradually move downward in the process of gradually approaching the circular shaft 63. When the circular shaft 63 reaches the position of the circular shaft groove 52, it is embedded in the circular shaft groove 52 and no longer moves downward. In this state, the fixing block 61 also engages the pressing plate 5 at the same time.

[0079] like Figure 5 As shown, the fixing block 61 restricts the movement of the pressing plate 5 by engaging the round tube 7 on the pressing plate 5. Specifically, the first driving position and the second driving position on the pressing plate 5 are provided with the round tube 7, and the engaging block 632 moves downward and is inserted into the round tube 7 to engage the pressing plate 5. At the same time, the round tube 7 also serves to connect the linear drive mechanism 9, and the connection here includes direct connection and indirect connection.

[0080] The simulation test device also includes a connecting tube 8, one end of which passes through the side plate 21 and is threadedly connected to the round tube 7, and a linear drive mechanism 9 is connected to the other end of the connecting tube 8. The linear drive mechanism 9 is connected to the pressure plate 5 through the connecting tube 8 and drives the pressure plate 5 to move; the connecting tube 8 is also used to unlock the engagement between the locking block 632 and the round tube 7.

[0081] Furthermore, a through groove 71 is formed on one side of the circular tube 7 facing the circular shaft groove 52 , and the engaging block 632 moves downward and is inserted into the through groove 71 to engage the pressure plate 5 . When the engaging block 632 is inserted into the through groove 71 , the circular shaft 63 is embedded in the circular shaft groove 52 .

[0082] In detail, since the circular shaft 63 can move up and down, the inclined surface of the pressure plate 5 causes the circular shaft 63 to gradually move downward as it gradually approaches the circular shaft 63. When the circular shaft 63 reaches the position of the circular shaft groove 52, it is embedded in the circular shaft groove 52 and no longer moves downward. At this time, the locking block 632 is inserted into the through groove 71 to restrict the circular tube 7, thereby indirectly restricting the pressure plate 5.

[0083] Furthermore, an unlocking shaft 72 is coaxially arranged in the circular tube 7 , and an end of the unlocking shaft 72 is connected to the plate surface of the pressure plate 5 via a third spring 74 , so that the unlocking shaft 72 can move along the axis direction of the circular tube 7 .

[0084] like Figure 6 and Figure 7 As shown, the unlocking shaft 72 is provided with an unlocking block 73 protruding toward the through slot 71. In one embodiment, the unlocking block 73 is a rectangular block. The unlocking block 73 extends out of the through slot 71, and the unlocking block 73 cooperates with the engaging block 632, and a side of the engaging block 632 facing the unlocking block 73 is set as an inclined surface. The unlocking block 73 cooperates with the engaging block 632 in that: the unlocking block 73 moves with the movement of the unlocking shaft 72, the unlocking block 73 moves toward the engaging block 632, and after the unlocking block 73 abuts against the engaging block 632, since the contact surface of the engaging block 632 is an inclined surface, force can be applied to the inclined surface to push the engaging block 632 upward, and after the engaging block 632 moves upward and disengages from the through slot 71, it contacts the restriction on the round tube 7, thereby indirectly releasing the restriction on the pressure plate 5.

[0085] Specifically, when the locking block 632 is inserted into the through slot 71 to lock the pressure plate 5, the connecting tube 8 drives the unlocking shaft 72 to move away from the pressure plate 5, driving the unlocking block 73 to move toward the locking block 632, and the unlocking block 73 abuts against the inclined surface of the locking block 632 and drives the locking block 632 to move upward to disengage from the through slot 71.

[0086] It should be noted that when the linear drive mechanism 9 is connected to the circular tube 7 through the connecting tube 8 and drives the pressure plate 5 to move, and then when the pressure plate 5 needs to be stored, the linear drive mechanism 9 drives the pressure plate 5 back to the side plate 21. In the process of gradually approaching the circular shaft 63, the inclined surface of the pressure plate 5 causes the circular shaft 63 to gradually move downward. When the circular shaft 63 reaches the position of the circular shaft groove 52, it is embedded in the circular shaft groove 52 and no longer moves downward. When the circular shaft 63 moves downward, the fixed block 61 moves downward, and the locking block 632 also moves downward. However, when the locking block 632 corresponds to the through groove 71, at this time, due to the connection between the connecting tube 8 and the unlocking shaft 72, the unlocking block 73 is below the inclined surface of the locking block 632. Therefore, the position of the unlocking block 73 blocks the locking block 632 from entering the through groove 71. At this time, the linear drive mechanism 9 is disconnected from the connecting tube 8, and after the connecting tube 8 is disconnected from the unlocking shaft 72, the unlocking shaft 72 moves toward the pressure plate 5 under the action of the third spring 74, the unlocking block 73 also moves, and the engaging block 632 enters the through groove 71 to engage the circular tube 7.

[0087] Specifically, when the unlocking block 73 abuts against the locking block 632 so that the locking block 632 is located outside the through groove 71, the connecting tube 8 drives the unlocking shaft 72 to move toward the pressure plate 5, so that the unlocking block 73 is disengaged from the locking block 632, and the locking block 632 falls downward into the through groove 71 to engage the round tube 7.

[0088] Among them, the surface of the unlocking shaft 72 has a first thread, the inner surface of the round tube 7 has a second thread, the outer surface of the connecting tube 8 has a third thread matching the second thread, and the inner surface has a fourth thread matching the first thread; the pitch of the first thread is greater than the pitch of the second thread.

[0089] For example, the thread directions of the first thread and the second thread are set so that when the connecting tube 8 rotates clockwise, the connecting tube 8 enters the round tube 7 and the unlocking shaft 72 enters the connecting tube 8. Or when the connecting tube 8 rotates counterclockwise, the connecting tube 8 enters the round tube 7 and the unlocking shaft 72 enters the connecting tube 8.

[0090] The connecting tube 8 is inserted between the unlocking shaft 72 and the round tube 7. When the connecting tube 8 is screwed, the connecting tube 8 moves toward the pressing plate 5, and the unlocking shaft 72 moves away from the pressing plate 5. The pitch of the first thread is greater than the pitch of the second thread, so that the moving step of the connecting tube 8 is smaller than the moving step of the unlocking shaft 72.

[0091] In summary, the pipe-soil interaction simulation test device provided by the present invention can, on the one hand, drive the movable door plate 23 to move to simulate foundation collapse through the driving mechanism 11. On the other hand, a linear driving mechanism 9 is used to connect the round tube 7 on the pressing plate 5 through the connecting tube 8. When the connecting tube 8 is not inserted, the engaging block 632 is located in the through groove 71 to engage the round tube 7. When the connecting tube 8 is inserted, the unlocking block 73 can be driven to push the engaging block 632 upward to unlock the round tube 7. When the pressing plate 5 is stored, the pressing plate 5 is moved close to the side plate 21, and the fixed block 61 drives the engaging block 632 to move downward to align with the through groove 71. The connecting tube 8 is rotated out of the round tube 7 so that the engaging block 632 falls downward into the through groove 71 to engage the round tube 7.

[0092] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0093] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe-soil interaction simulation test device, characterized in that: include: A base (1), the bottom of which is provided with a driving mechanism (11); A test box (2) is mounted on the base (1) and has a cubic structure and two opposite side panels (21); The test box (2) is provided with base platforms (22) near the two side panels (21), two movable door panels (23) are provided between the two base platforms (22) along the length direction of the side panels (21), the driving mechanism (11) is connected to the two movable door panels (23), a first pressure sensor (A) is provided at the bottom of the movable door panels (23), the test box (2) is filled with sand from the top, and a pipeline (3) is buried in the sand, a displacement sensor (B) is provided at the top of the sand, and a tension pressure sensor (C) is provided between the driving mechanism (11) and the movable door panels (23); A monitoring device (4) is electrically connected to the first pressure sensor (A), the displacement sensor (B) and the tension and pressure sensor (C); when the driving mechanism (11) drives one of the movable door panels (23) to move along the height direction of the test box (2), the monitoring device (4) collects data from the first pressure sensor (A), the displacement sensor (B) and the tension and pressure sensor (C) to obtain pipe-soil interaction information and displacement information of the movable door panel (23).

2. The pipe-soil interaction simulation test device according to claim 1, characterized in that: The monitoring device (4) comprises a data acquisition module (41), a data analysis module (42) and a camera module (43); the data acquisition module (41) is electrically connected to the data analysis module (42); the data acquisition module (41) is also electrically connected to the first pressure sensor (A), the displacement sensor (B) and the tension pressure sensor (C); the monitoring device (4) further comprises a camera module (43); the camera module (43) is used to capture images at set intervals when the driving mechanism (11) drives one of the movable door panels (23) to move along the height direction of the test box (2) and transmit the images to the data analysis module (42).

3. The pipe-soil interaction simulation test device according to claim 2, characterized in that: The test box (2) is further provided with a pressing plate (5) corresponding to the two side plates (21), and the two pressing plates (5) are respectively matched with the corresponding two side plates (21); The simulation test device also includes linear drive mechanisms (9) respectively installed on the outside of the two side plates (21), two linear drive mechanisms (9) are correspondingly arranged at one side plate (21), the two linear drive mechanisms (9) both pass through the side plates (21) and are respectively matched to be connected to a first drive position and a second drive position on the pressing plate (5), the first drive position and the second drive position are arranged on the surface of the pressing plate (5) and in a vertical direction up and down, and the linear drive mechanism (9) is used to drive the pressing plate (5) to move; Two first engaging assemblies (6) are arranged on one side of the side plate (21) facing the pressure plate (5), and the two first engaging assemblies (6) are arranged up and down in a vertical direction. The first engaging assemblies (6) are used to engage and connect the pressure plate (5) when the pressure plate (5) is close to the side plate (21).

4. The pipe-soil interaction simulation test device according to claim 3 is characterized in that: The first engaging assembly (6) comprises a fixing block (61) symmetrically mounted on the side plate (21), a groove (62) being recessed on the fixing block (61), the first engaging assembly (6) further comprising a circular shaft (63), two ends of the circular shaft (63) having connecting plates, the connecting plates being correspondingly mounted in the grooves (62) and connected to the bottom of the grooves (62) via a first spring (64), the circular shaft (63) also comprising a fixing portion (631), the fixing portion (631) being located on a side facing away from the pressure plate (5) and extending in the direction thereof, and a locking block (632) being arranged at the bottom of the fixing portion (631); A contact block (51) is provided on one side of the pressing plate (5) facing the side plate (21); a side of the contact block (51) facing the circular shaft (63) is an inclined surface; a circular shaft groove (52) and a fixed block groove (53) are also provided on one side of the pressing plate (5) facing the side plate (21); the circular shaft groove (52) and the fixed block groove (53) are connected, and the circular shaft groove (52) corresponds to the circular shaft (63), and the fixed block groove (53) corresponds to the fixed block (61); When the pressing plate (5) moves toward the side plate (21), the inclined surface of the abutting block (51) abuts against the circular shaft (63) and moves downward until it is embedded in the circular shaft groove (52), the fixing block (61) is inserted into the fixing block groove (53), and the locking block (632) at the bottom of the fixing portion (631) is locked with the pressing plate (5).

5. The pipe-soil interaction simulation test device according to claim 4, characterized in that: The bottom of the fixing portion (631) is recessed to form a receiving groove (633), and the engaging block (632) is located in the receiving groove (633) and is connected to the receiving groove (633) via a second spring (634).

6. The pipe-soil interaction simulation test device according to claim 4, characterized in that: A circular tube (7) is provided at the first driving position and the second driving position on the pressing plate (5), and the engaging block (632) moves downward and is inserted into the circular tube (7) to engage the pressing plate (5); The simulation test device also includes a connecting tube (8), one end of which passes through the side plate (21) and is threadedly connected to the round tube (7), and a linear drive mechanism (9) is connected to the other end of the connecting tube (8). The linear drive mechanism (9) is connected to the pressure plate (5) through the connecting tube (8) and drives the pressure plate (5) to move; the connecting tube (8) is also used to unlock the engagement between the locking block (632) and the round tube (7).

7. The pipe-soil interaction simulation test device according to claim 6, characterized in that: A through groove (71) is formed on one side of the circular tube (7) facing the circular shaft groove (52); the engaging block (632) moves downward and is inserted into the through groove (71) to engage the pressure plate (5); when the engaging block (632) is inserted into the through groove (71), the circular shaft (63) is embedded in the circular shaft groove (52).

8. The pipe-soil interaction simulation test device according to claim 7, characterized in that: An unlocking shaft (72) is coaxially arranged in the circular tube (7), the end of the unlocking shaft (72) is connected to the plate surface of the pressure plate (5) via a third spring (74), an unlocking block (73) is arranged on the unlocking shaft (72) protruding toward the through slot (71), the unlocking block (73) extends out of the through slot (71), the unlocking block (73) cooperates with the engaging block (632), and a side of the engaging block (632) facing the unlocking block (73) is arranged as an inclined surface; When the locking block (632) is inserted into the through slot (71) to lock the pressure plate (5), the connecting tube (8) drives the unlocking shaft (72) to move away from the pressure plate (5), driving the unlocking block (73) to move toward the locking block (632), and the unlocking block (73) abuts against the inclined surface of the locking block (632) and drives the locking block (632) to move upward to disengage from the through slot (71); When the unlocking block (73) abuts against the engaging block (632) so that the engaging block (632) is located outside the through groove (71), the connecting tube (8) drives the unlocking shaft (72) to move toward the pressing plate (5), so that the unlocking block (73) is disengaged from the engaging block (632), and the engaging block (632) falls downward into the through groove (71) to engage with the round tube (7).

9. The pipe-soil interaction simulation test device according to claim 8, characterized in that: The unlocking shaft (72) has a first thread on its surface, the inner surface of the round tube (7) has a second thread, the outer surface of the connecting tube (8) has a third thread that matches the second thread, and the inner surface has a fourth thread that matches the first thread; the pitch of the first thread is greater than the pitch of the second thread; The connecting tube (8) is inserted between the unlocking shaft (72) and the round tube (7). When the connecting tube (8) is spirally connected, the connecting tube (8) moves toward the pressing plate (5), and the unlocking shaft (72) moves away from the pressing plate (5), and the moving step of the connecting tube (8) is smaller than the moving step of the unlocking shaft (72).

10. The pipe-soil interaction simulation test device according to claim 3, characterized in that: The pressing plate (5) is provided with a plurality of second pressure sensors (D) on a side facing away from the linear drive mechanism (9), and the data acquisition module (41) is electrically connected to the second pressure sensors (D) and is used to collect pressure information between the pressing plate (5) and the sand.

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