A device for simulating and testing the performance of buried ABR pipelines

Abstract

The present invention discloses a device for simulating and testing the performance of buried ABR pipelines, which belongs to the field of pipeline detection technology. The upper end of the mounting frame is provided with a hydraulic actuator with an output end arranged vertically downward, and the output end of the hydraulic actuator is provided with a connector, which is connected to the output end of the hydraulic actuator. A force sensor is provided between the connector and the output end of the hydraulic actuator, and the lower end of the connector is provided with a connecting frame, the upper surface of the connecting frame is fixedly connected to the connecting frame, and the lower surface of the connecting frame is provided with a pressure plate fixedly connected thereto, and a test soil box is provided below the pressure plate, and the test soil box contains test soil. A hydraulic loading device is provided on the outside of the test soil box, and a pressure pipe is provided on the hydraulic loading device. This technical solution is used to solve the problem that the pipeline external load test device in the prior art cannot accurately simulate the pressure condition of the ABR pipeline when it is buried in the soil layer, thereby resulting in inaccurate test results.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline detection, and in particular relates to a device for simulating and testing the performance of buried ABR pipelines. Background Art

[0002] Based on the blending of acrylic resin, polyvinyl chloride resin and auxiliary materials such as heat stabilizers, ABR material is generated through the strong intermolecular force between acrylic super molecules and polyvinyl chloride molecules. It has the advantages of low temperature resistance, high impact resistance, high strength and toughness, and high external load, and its application range is gradually expanding.

[0003] With the continuous development of cities and the increasing depth of buried pipelines, the impact of soil pressure on the response of buried pipelines has become increasingly prominent. In actual operation, external pressure can cause pipeline deformation and, under heavy loads, even damage. Currently, ABR pipe manufacturers are focusing on effectively testing the ability of ABR pipes to withstand internal and external loads, taking into account the impact of varying pipeline burial depths and soil conditions.

[0004] Existing pipeline external load tests, both domestically and internationally, generally use the ring stiffness test method, which employs two rigid plates to load the pipeline sample. This load pattern differs significantly from the load distribution pattern of buried pipelines. On the one hand, it cannot simulate the soil confining pressure loads actually applied to buried pipelines, and on the other hand, it fails to account for the lateral constraints imposed by the soil on the pipeline. Consequently, the external pressure performance of ABR pipelines tested using the ring stiffness method differs significantly from the external pressure performance of actual ABR pipelines buried within the soil. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a device for simulating and testing the performance of buried ABR pipelines, so as to solve the problem that the pipeline external load test device in the prior art cannot accurately simulate the pressure conditions of the ABR pipeline when buried in the soil layer, thereby resulting in inaccurate test results.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a device for simulating and testing the performance of a buried ABR pipeline, comprising a mounting frame, wherein the upper end of the mounting frame is provided with a hydraulic actuator with an output end arranged vertically downward, the output end of the hydraulic actuator is provided with a connector, the connector is connected to the output end of the hydraulic actuator, a force sensor is provided between the connector and the output end of the hydraulic actuator, the lower end of the connector is provided with a connecting frame, the upper surface of the connecting frame is fixedly connected to the connecting head, the lower surface of the connecting frame is provided with a pressure plate fixedly connected thereto, a test soil box is provided below the pressure plate, the test soil box contains test soil, a hydraulic loading device is provided on the outside of the test soil box, and a pressurizing pipe is provided on the hydraulic loading device.

[0008] The simulation test principle of this technical solution is as follows:

[0009] The ABR pipe sample is buried in the test soil. At this time, one end of the ABR pipe sample is closed and the other end is connected to the pressurized pipe. The hydraulic loading device applies pressure to the pressurized pipe (simulating the water pressure inside the ABR pipe sample when it is working under the soil layer). At the same time, the hydraulic actuator applies pressure to the test soil above the ABR pipe sample to simulate the pressure condition of the ABR pipe sample in the soil layer, and data collection and analysis are performed (data collection and analysis are existing technologies and can be understood as various sensors pre-installed on the ABR pipe sample).

[0010] Furthermore, a screw rod is provided in the middle of the upper end of the mounting frame, and both ends of the screw rod are rotatably connected to the mounting frame. A rotating motor is provided on one end of the screw rod, and the rotating motor is fixedly connected to the mounting frame. A nut is provided on the screw rod, and the hydraulic actuator is fixedly connected to the nut. There are symmetrical light rods on both sides of the screw rod, and the nuts are slidably connected to the light rods. Both ends of the light rods are fixedly connected to the upper end of the mounting frame.

[0011] The screw is driven to rotate by a rotating motor, thereby driving the nut to move on the screw, and then driving the pressure plate to move in the test soil box. The advantage of this is that it can simulate the pressure conditions of the ABR pipe sample when pressure is applied to different positions of the soil layer above the ABR pipe sample. At the same time, the movement of the pressure plate can also move and compact the surface of the replacement test soil.

[0012] Furthermore, through grooves are provided on both ends of the pressure plate, and a U-shaped plate is provided on the upper surface of the through groove. The open end of the U-shaped plate is fixedly connected to the pressure plate, a roller is provided inside the U-shaped plate, and a roller mounting seat is provided on the outside of the roller. A first threaded hole is provided in the middle of the closed end of the U-shaped plate, and a first screw matching it is provided in the first threaded hole, and the end of the first screw is fixedly connected to the upper surface of the roller mounting seat.

[0013] By rotating the first screw, the position of the roller relative to the pressure plate can be controlled. When the roller is above the lower surface of the pressure plate, the roller does not contact the soil layer. At this time, it can simulate the soil layer above the ABR pipe sample being subjected to large-area pressure (heavy objects piled above the soil layer), and then analyze the pressure condition of the ABR pipe sample. When the pipe wheel is below the lower surface of the pressure plate, it can simulate the soil layer above the ABR pipe sample being subjected to local pressure (which can be understood as a vehicle running over the soil layer), and then analyze the pressure condition of the ABR pipe sample.

[0014] Furthermore, a through hole is provided in the middle of the connecting head, and the output end of the hydraulic actuator is slidably connected to the through hole. A spring is sleeved on the output end of the hydraulic actuator, one end of the spring is fixedly connected to the housing of the hydraulic actuator, and the other end of the spring is fixedly connected to the connecting head. The advantage of this arrangement is that when the pressure plate acts on the soil layer quickly, the spring will play a shock-absorbing role, which is used to simulate the situation where a vehicle quickly presses through the soil layer above the ABR pipe sample. The spring can be understood as the shock-absorbing suspension of the car.

[0015] Furthermore, the output end of the hydraulic actuator is provided with a plurality of limiting holes evenly distributed along the length, and the side of the connector is provided with through holes corresponding to the positions of the limiting holes. The through holes are provided with limiting pins for fixing the connector to the output end of the hydraulic actuator. This is advantageous in that the provision of the limiting pins and limiting holes enables the pressure plate to be selectively rigidly connected to the output end of the hydraulic actuator, thereby simulating the situation where there is no shock absorption when heavy objects are piled above the ABR pipe specimen. It is also not difficult to understand that since the connector and the output end of the hydraulic actuator are connected by a spring, the pressure plate can rotate under the action of an external force. After rotation, the pressure plate is rotationally limited and fixed by the limiting pins. Therefore, the direction of the pressure plate can be rotated, that is, it can simulate the situation of soil pressure applied to the ABR pipe specimen in the length direction or the width direction, thereby analyzing the pressure conditions of the ABR pipe specimen when the pressure direction is different.

[0016] Furthermore, a plurality of evenly distributed second threaded holes are provided on the bottom surface of the test soil box, each of which is provided with a second screw matching the second threaded hole. This is advantageous in that the second screw is located in the soil layer below the ABR pipe specimen. That is, by adjusting the length of the second screw, the soil layer below the second screw can be collapsed, thereby simulating the pressure conditions under which the soil layer below the ABR pipe specimen collapses (the upper soil layer will move downward to fill the gap created by the movement of the second bolt). It is also easy to understand that by adjusting the length of the second screw at different positions, it is possible to simulate the conditions under which the soil layer below the ABR pipe specimen collapses in its length direction, width direction, or other directions.

[0017] Furthermore, a tapered end portion is provided on one end of the second screw rod located in the test soil box, and the smaller end of the tapered end portion is arranged toward the bottom surface of the test soil box. The intention is that the arrangement of the tapered end portion can relatively reduce the number of second screw rods arranged. At the same time, the purpose of setting it to a cone is to reduce the movement resistance of the tapered end portion in the soil layer. At the same time, the arrangement of the tapered end portion makes the gap after the second bolt moves downward larger, that is, the effect of simulating soil collapse is more obvious.

[0018] Furthermore, a flexible fabric is sleeved on the second screw, one end of the flexible fabric is fixed to the cylindrical end, and the other end of the flexible fabric is fixedly connected to the bottom surface of the test soil box. The benefit is that sand and gravel are prevented from entering the thread of the second screw and affecting the rotation of the second screw.

[0019] Furthermore, the mounting frame includes a column and a crossbeam, a telescopic element is provided in the middle and lower part of the column, the output end of the telescopic element is set upward, and the outer side surfaces at both ends of the test soil box are fixedly connected to the column above the output end of the telescopic element. The benefit is that the test soil box is lifted to facilitate the operation of rotating the second screw.

[0020] Furthermore, the telescopic element is a hydraulic rod.

[0021] The beneficial effects of the present invention are:

[0022] (1) The present invention can simulate the working conditions of different vehicle models acting on the soil layer by adjusting the aspect ratio of the pressure plate; (2) By adjusting the applied load by the hydraulic actuator, the different burial depths of the ABR pipe sample can be simulated; (3) By adjusting the pressure of the hydraulic loading device, the water pressure in the ABR pipe sample can be adjusted, thereby simulating the operation state of the pipeline; (4) By replacing the test soil material, different geological environments are simulated, and the lateral soil constraint effect of the buried pipeline is simulated in the test, thereby realizing the accurate test of the actual performance of the buried ABR pipeline; (5) The setting of the second screw can simulate the situation when the soil layer below the ABR pipe sample collapses in different directions and different positions.

[0023] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0025] Figure 1 A three-dimensional schematic diagram of a device for simulating and testing the performance of buried ABR pipelines according to the present invention;

[0026] Figure 2 A three-dimensional schematic diagram of another direction of the device for simulating and testing the performance of buried ABR pipelines according to the present invention;

[0027] Figure 3 Schematic diagram of a left side view of a device for simulating and testing the performance of a buried ABR pipeline according to the present invention;

[0028] Figure 4 Schematic diagram of a front view of a device for simulating and testing the performance of a buried ABR pipeline according to the present invention;

[0029] Figure 5 A schematic cross-sectional view of a left side view of a device for simulating and testing the performance of a buried ABR pipeline according to the present invention;

[0030] Figure 6 A schematic cross-sectional view of a front view of a device for simulating and testing the performance of a buried ABR pipeline according to the present invention;

[0031] Figure 7 For the present invention Figure 2 A local enlarged schematic diagram of point A in the middle.

[0032] The following are marked in the accompanying drawings:

[0033] Column 1, beam 2, rotating motor 3, screw 4, polished rod 5, nut 6, hydraulic actuator 7, output end 8, spring 9, limit hole 10, connector 11, limit pin 12, connecting frame 13, pressure plate 14, U-shaped plate 15, through groove 16, roller 17, first screw 18, ABR pipe specimen 19, second screw 20, tapered end 21, test soil box 22, hydraulic loading device 23, pressurized pipe 24, test soil 25. DETAILED DESCRIPTION

[0034] like Figures 1 to 7 As shown, the present invention is a device for simulating and testing the performance of a buried ABR pipeline, including a mounting frame, a hydraulic actuator 7 with an output end 8 arranged vertically downward at the upper end of the mounting frame, a connector 11 is provided on the output end 8 of the hydraulic actuator 7, the connector 11 is connected to the output end 8 of the hydraulic actuator 7, a force sensor is provided between the connector 11 and the output end 8 of the hydraulic actuator 7, a connecting frame 13 is provided at the lower end of the connecting frame 11, the upper surface of the connecting frame 13 is fixedly connected to the connecting head 11, and the lower surface of the connecting frame is provided with a pressure plate 14 fixedly connected thereto, a test soil box 22 is provided below the pressure plate 14, and a test soil body 25 is contained in the test soil box 22. A hydraulic loading device 23 is provided on the outside of the test soil box 22, and a pressurizing pipe 24 is provided on the hydraulic loading device 23.

[0035] The simulation test principle of this technical solution is as follows:

[0036] The ABR pipe sample 19 is buried in the test soil 25. At this time, one end of the ABR pipe sample 19 is closed, and the other end is connected to the pressurized pipe 24. The hydraulic loading device 23 applies pressure to the pressurized pipe 24 (simulating the water pressure inside the ABR pipe sample 19 when it is working under the soil layer). At the same time, the hydraulic actuator 7 is operated to apply pressure to the test soil 25 above the ABR pipe sample 19 to simulate the pressure condition of the ABR pipe sample 19 in the soil layer, and data collection and analysis are performed (data collection and analysis are existing technologies and can be understood as various sensors pre-installed on the ABR pipe sample 19).

[0037] Preferably, the test soil box 22 includes a bottom plate, side plates disposed on both sides of the bottom plate, and baffles disposed at the front and rear ends of the bottom plate. The baffles are provided with pipe placement holes for placing the ABR pipe specimen 19. Preferably, hydraulic loading devices 23 are provided at both ends of the ABR pipe specimen 19. The hydraulic loading devices 23 are preferably pressure pumps. The hydraulic actuator 7 is an electro-hydraulic servo actuator or a digital hydraulic linear servo actuator. In this embodiment, the hydraulic actuator 7 is an electro-hydraulic servo actuator. A force sensor is connected to the power end of the hydraulic actuator 7.

[0038] The force sensor is used to collect the load applied by the hydraulic actuator 7. The force sensor is a strain gauge pressure sensor, a piezoresistive pressure sensor, a capacitive pressure sensor, or a piezoelectric pressure sensor. In this embodiment, the force sensor is a strain gauge pressure sensor. The test soil 25 is the soil material of the ABR pipeline application project or standard medium-coarse sand. In this embodiment, the test soil 25 is standard medium-coarse sand.

[0039] For further understanding, the test method of this device is divided into the following four steps: 1. Install the test ABR pipe specimen 19 and fill it with test soil 25 to 0.5m above the top of the pipe; 2. Install the hydraulic loading device 23 and apply a hydraulic pressure of 1.5 times the nominal pressure to the pipe; 3. Apply a pressure calculated based on the maximum burial depth of the project and the vehicle load through the hydraulic actuator 7; 4. Maintain the pressure for 10 minutes and check the joints and pipe body for damage and water leakage. The ABR pipe is considered to meet the application requirements for the project.

[0040] Preferably, a screw rod 4 is provided in the middle of the upper end of the mounting frame, and both ends of the screw rod 4 are rotatably connected to the mounting frame. A rotating motor 3 is provided on one end of the screw rod 4, and the rotating motor 3 is fixedly connected to the mounting frame. A nut 6 is provided on the screw rod 4, and a hydraulic actuator 7 is fixedly connected to the nut 6. There are symmetrical polished rods 5 on both sides of the screw rod 4, and the nut 6 is slidably connected to the polished rod 5. Both ends of the polished rod 5 are fixedly connected to the upper end of the mounting frame.

[0041] The screw rod 4 is driven to rotate by the rotating motor 3, thereby driving the nut 6 to move on the screw rod 4, and then driving the pressure plate 14 to move in the test soil box 22. The advantage of this is that the pressure condition of the ABR pipe sample 19 when pressure is applied to different positions of the soil layer above the ABR pipe sample 19 can be simulated. At the same time, the movement of the pressure plate 14 can also move and compact the surface of the replacement test soil 25.

[0042] Both ends of the pressure plate 14 are provided with through grooves 16, and the upper surface of the through groove 16 is provided with a U-shaped plate 15. The open end of the U-shaped plate 15 is fixedly connected to the pressure plate 14, and a roller 17 is provided inside the U-shaped plate 15. The outer side of the roller 17 is provided with a roller 17 mounting seat. A first threaded hole is provided in the middle of the closed end of the U-shaped plate 15, and a first screw 18 matching it is provided in the first threaded hole. The end of the first screw 18 is fixedly connected to the upper surface of the roller 17 mounting seat.

[0043] By rotating the first screw 18, the position of the roller 17 relative to the pressure plate 14 can be controlled. When the roller 17 is located above the lower surface of the pressure plate 14, the roller 17 does not contact the soil layer. At this time, it can simulate the soil layer above the ABR pipe sample 19 being subjected to large-area pressure (heavy objects piled above the soil layer), and then analyze the pressure condition of the ABR pipe sample 19. When the pipe wheel is located below the lower surface of the pressure plate 14, it can simulate the soil layer above the ABR pipe sample 19 being subjected to local pressure (which can be understood as a vehicle pressing over the soil layer), and then analyze the pressure condition of the ABR pipe sample 19.

[0044] A through hole is provided in the middle of the connector 11, and the output end 8 of the hydraulic actuator 7 is slidably connected to the through hole. A spring 9 is sleeved on the output end 8 of the hydraulic actuator 7, and one end of the spring 9 is fixedly connected to the housing of the hydraulic actuator 7, and the other end of the spring 9 is fixedly connected to the connector 11. In this arrangement, when the pressure plate 14 acts on the soil layer quickly, the spring 9 will play a shock-absorbing role, which is used to simulate the situation where a vehicle quickly presses through the soil layer above the ABR pipe sample 19. The spring 9 can be understood as the shock-absorbing suspension of the car.

[0045] The output end 8 of the hydraulic actuator 7 is provided with a plurality of limiting holes 10 evenly distributed along the length direction, and a through hole corresponding to the position of the limiting hole 10 is provided on the side of the connector 11. A limiting pin 12 for fixing the connector 11 to the output end 8 of the hydraulic actuator 7 is provided in the through hole. The setting of the limiting pin 12 and the limiting hole 10 enables the pressure plate 14 to be rigidly connected to the output end 8 of the hydraulic actuator 7 to simulate the situation where there is no shock absorption when heavy objects are piled above the ABR pipe sample 19. At the same time, it is not difficult to understand that due to the connection The head 11 and the output end 8 of the hydraulic actuator 7 are connected by a spring 9, that is, the pressure plate 14 can rotate under the action of an external force. After rotation, the pressure plate 14 is rotationally limited and fixed by the limit pin 12. Therefore, the direction of the pressure plate 14 can be rotated, that is, the situation of applying pressure to the soil layer in the length direction or the width direction of the ABR pipe sample 19 can be simulated, and the pressure conditions of the ABR pipe sample 19 under different pressure directions can be analyzed. It should be noted that at this time, the limit hole 10 is arranged in a cross shape (not shown in the figure).

[0046] A number of evenly distributed second threaded holes are provided on the bottom surface of the test soil box 22, and a second screw 20 matching the second threaded hole is provided in each of the second threaded holes. The second screw 20 is located in the soil layer below the ABR pipe sample 19. That is, by adjusting the length of the second screw 20, the soil layer below the second screw 20 can be collapsed, thereby simulating the pressure condition of the soil layer below the ABR pipe sample 19 when it collapses (the upper soil layer will move down to fill the gap created by the movement of the second bolt). At the same time, it is not difficult to understand that by adjusting the length of the second screw 20 at different positions, the situation when the soil layer below the ABR pipe sample 19 collapses in its length direction or width direction, or other directions can be simulated.

[0047] A conical end portion 21 is provided on one end of the second screw rod 20 located in the test soil box 22, and the smaller end of the conical end portion 21 is arranged toward the bottom surface of the test soil box 22. The intention is that the arrangement of the conical end portion 21 can relatively reduce the number of arrangements of the second screw rod 20. At the same time, the purpose of being set to a cone is to reduce the movement resistance of the conical end portion 21 in the soil layer. At the same time, the arrangement of the conical end portion 21 makes the gap after the second bolt moves downward larger, that is, the effect of simulating soil layer collapse is more obvious.

[0048] A flexible fabric is sleeved on the second screw 20 , one end of the flexible fabric is fixed to the cylindrical end, and the other end of the flexible fabric is fixedly connected to the bottom surface of the test soil box 22 to prevent sand and gravel from entering the thread of the second screw 20 and affecting the rotation of the second screw 20 .

[0049] The mounting frame includes a column 1 and a crossbeam 2. A telescopic element is provided in the lower middle portion of the column 1, with the output end of the telescopic element facing upward. The outer sides of the test soil box 22 are fixedly connected to the column 1 above the output end of the telescopic element, raising the test soil box 22 and facilitating the rotation of the second screw 20. The telescopic element is preferably a hydraulic rod. It should be noted that in this technical solution, the output end refers to the movable end. For example, in the case of a hydraulic rod, the output end is the telescopic rod.

[0050] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A device for simulating and testing the performance of buried ABR pipelines, characterized by: The cam is connected to the hydraulic cylinder to form a circle, and the cam is connected to the hydraulic cylinder to form a circle.

2. The device for simulating and testing the performance of buried ABR pipelines according to claim 1, characterized in that: A screw rod is provided in the middle of the upper end of the mounting frame, and both ends of the screw rod are rotatably connected to the mounting frame. A rotating motor is provided on one end of the screw rod, and the rotating motor is fixedly connected to the mounting frame. A nut is provided on the screw rod, and the hydraulic actuator is fixedly connected to the nut. There are symmetrical polished rods on both sides of the screw rod, and the nuts are slidably connected to the polished rods. Both ends of the polished rods are fixedly connected to the upper end of the mounting frame.

3. The device for simulating and testing the performance of buried ABR pipelines according to claim 1, characterized in that: A through hole is provided in the middle of the connecting head, and the output end of the hydraulic actuator is slidably connected in the through hole. A spring is sleeved on the output end of the hydraulic actuator, one end of the spring is fixedly connected to the housing of the hydraulic actuator, and the other end of the spring is fixedly connected to the connecting head.

4. The device for simulating and testing the performance of an underground ABR pipeline according to claim 3, characterized in that: The output end of the hydraulic actuator is provided with a plurality of limiting holes evenly distributed along the length direction, and the side surface of the connecting head is provided with through holes corresponding to the positions of the limiting holes. The through holes are provided with limiting pins for fixing the connecting head to the output end of the hydraulic actuator.

5. The device for simulating and testing the performance of buried ABR pipelines according to claim 1, characterized in that: A plurality of evenly distributed second threaded holes are provided on the bottom surface of the test soil box, and a second screw rod matching the second threaded hole is provided in each of the second threaded holes.

6. The device for simulating and testing the performance of buried ABR pipelines according to claim 5, characterized in that: A conical end portion is provided on one end of the second screw rod located in the test soil box, and the smaller end of the conical end portion is arranged toward the bottom surface of the test soil box.

7. The device for simulating and testing the performance of buried ABR pipelines according to claim 6, characterized in that: A flexible cloth is sleeved on the second screw rod, one end of the flexible cloth is fixed on the columnar end, and the other end of the flexible cloth is fixedly connected to the bottom surface of the test soil box.

8. The device for simulating and testing the performance of an underground ABR pipeline according to claim 1, characterized in that: The mounting frame includes a column and a beam. A telescopic element is provided at the middle and lower part of the column. The output end of the telescopic element is arranged upward. The outer side surfaces of both ends of the test soil box are fixedly connected to the column above the output end of the telescopic element.

9. The device for simulating and testing the performance of buried ABR pipelines according to claim 8, characterized in that: The telescopic element is a hydraulic rod.

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