Soil box load device for testing external pressure performance of buried pipeline

Abstract

The utility model relates to the technical field of pipeline external pressure performance testing, and discloses a soil box loading device for testing the external pressure performance of a buried pipeline, which comprises a base and further comprises a box body arranged at the top of the base, a fixing frame is arranged on the base, a mounting seat is fixedly arranged on the fixing frame, and the box body is arranged on the top of the box body. A first hydraulic rod is fixedly connected to the mounting seat, and a pressing plate is fixedly connected to a piston rod of the first hydraulic rod; the pipeline is clamped and fixed in the box body through the limiting assembly, the situation that the testing effect is affected due to the fact that the pipeline rolls in the testing process is avoided, after the pipeline is fixed, the first hydraulic rod drives the pressing plate to press downwards to apply pressure to the pipeline, the pressure is detected through the strain rosette, and the limiting assembly can be adjusted according to the sizes of different pipelines; the pipeline is fixed in the box body, and the open holes are formed in the two sides of the box body, so that pipelines with different lengths can be contained.

Description

Technical Field

[0001] This utility model relates to the field of pipeline external pressure performance testing technology, specifically a soil box load device for testing the external pressure performance of buried pipelines. Background Technology

[0002] Pipelines, as one of the five major modes of transportation, are ubiquitous in people's daily lives and are closely linked to our lives. Statistics show that the total length of long-distance pipelines laid worldwide exceeds two million kilometers. With the rapid development of cities and the continuous increase in population, above-ground space resources are extremely limited. Buried pipelines have effectively solved this problem. Buried pipelines are widely used because of their concealment and safety, not occupying farmland, not affecting traffic, not taking up space, and low construction costs. Therefore, the demand for buried pipelines is large. However, when buried pipelines are laid in different locations, the different local geological and climatic conditions will have different impacts on their mechanical properties.

[0003] Soil temperature is constantly changing due to the influence of the external environment, and the temperature of the pipeline inside the soil also changes with the temperature of the surrounding soil, causing pipeline deformation. However, because the pipeline is constrained by the surrounding soil, it cannot deform fully, inevitably leading to thermal stress inside the pipeline. Therefore, it is necessary to study the mechanical properties of buried pipelines under the influence of constantly changing external environmental temperatures. Currently, soil box load devices for testing pipeline external pressure performance are generally used to test pipelines. However, traditional soil boxes can only test pipelines of a size that matches the box size. When different pipelines need to be tested, different boxes need to be used, which is cumbersome. Utility Model Content

[0004] The purpose of this invention is to provide a soil box load device for testing the external pressure performance of buried pipelines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a soil box load device for testing the external pressure performance of buried pipelines, comprising a base, and further comprising:

[0006] The housing is installed on the top of the base, the base is equipped with a fixing frame, the fixing frame is fixedly installed with a mounting base, the mounting base is fixedly connected with a first hydraulic rod, and the piston rod of the first hydraulic rod is fixedly connected with a pressure plate;

[0007] The pipe is installed inside the housing, and strain gauges are attached to the outer surface of the pipe. A limiting component for clamping and limiting the pipe is installed on the outside of the housing.

[0008] Preferably, the housing includes a fixed frame mounted on the top of the base, the fixed frame having an internal mounting groove, and a sealing plate inserted into the fixed frame.

[0009] Preferably, fixing bolts are installed on the fixing frame, and screw holes are provided on the mounting groove.

[0010] Preferably, the sealing plate has an opening for the pipe to enter the box.

[0011] Preferably, the limiting component includes a fixed seat fixedly connected to the sealing plate, a second hydraulic rod fixedly connected to the bottom of the fixed seat, a connecting frame fixedly connected to the piston rod of the second hydraulic rod, a connecting rod rotatably connected to the connecting frame, a clamping plate rotatably connected to the connecting rod, a connecting shaft fixedly connected to the connecting rod, and the connecting shaft rotatably connected to the sealing plate.

[0012] Preferably, the connecting frame has a sliding groove, and a rotating shaft is fixedly connected to the connecting rod, the rotating shaft sliding in the sliding groove.

[0013] Preferably, two sets of symmetrical reinforcing plates are fixedly connected to the base.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention utilizes a limiting component to secure the pipe within the housing, preventing it from rolling during testing and affecting the test results. After the pipe is secured, a pressure plate is pressed down by a first hydraulic rod to apply pressure to the pipe. Stress analysis is performed using a strain gauge and an INV2366 bus static strain test analyzer. The limiting component can be adjusted according to different pipe sizes to secure the pipe within the housing, and openings are provided on both sides of the housing to accommodate pipes of different lengths. Attached Figure Description

[0016] Figure 1 A schematic diagram of the soil box load device for testing the external pressure performance of buried pipelines provided by this utility model;

[0017] Figure 2 A schematic diagram of the fixed frame structure provided by this utility model;

[0018] Figure 3 A schematic diagram of the sealing plate structure provided by this utility model;

[0019] Figure 4 A schematic diagram of the limiting component structure provided by this utility model;

[0020] Figure 5 A schematic diagram of the strain rose structure provided by this utility model.

[0021] In the diagram: 1. Base; 2. Box body; 201. Fixing frame; 202. Mounting groove; 203. Sealing plate; 3. Fixing bracket; 4. Mounting seat; 5. First hydraulic rod; 6. Pressure plate; 7. Strain gauge; 8. Opening; 9. Pipe; 10. Limiting assembly; 1001. Fixing seat; 1002. Second hydraulic rod; 1003. Connecting frame; 1004. Connecting rod; 1005. Clamping plate; 1006. Connecting shaft; 11. Fixing bolt; 12. Screw hole; 13. Slide groove; 14. Reinforcing plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 As shown, a soil box load device for testing the external pressure performance of buried pipelines includes a base 1, and further includes: a box body 2, installed on the top of the base 1, a fixing frame 3 installed on the base 1, a mounting seat 4 fixedly installed on the fixing frame 3, a first hydraulic rod 5 fixedly connected to the mounting seat 4, a pressure plate 6 fixedly connected to the piston rod of the first hydraulic rod 5, and the pressure plate 6 being moved downward by the first hydraulic rod 5; a pipeline 9, installed inside the box body 2, strain gauges 7 being pasted on the outer surface of the pipeline 9, and a limiting component 10 for clamping and limiting the pipeline 9 installed on the outside of the box body 2, which can limit and fix pipelines 9 of different sizes in the box body 2.

[0024] It should be noted that: a strain gauge 7 is attached to a designated section on the outer surface of the pipe 9, and the pipe 9 is inserted into the bottom of the housing 2. The pipe 9 is secured in the housing 2 using the limiting component 10 to prevent the pipe 9 from rolling during testing and affecting the test results. After the pipe 9 is secured, a soil sample is added to the inside of the housing 2, and the pressure plate 6 is pressed down by the first hydraulic rod 5 to apply pressure to the pipe 9. The strain gauge 7 is equipped with an "INV2366 bus static strain test analyzer". By changing the attachment position of the strain gauge 7, the relationship between the longitudinal stress and circumferential stress of the pipe 9 and the angle of the pipe 9 can be measured.

[0025] Specifically, the strain gauge 7 is attached to the top, 45°, 90°, 135° and bottom of the pipe 9. The strain gauge 7 is a prior art, a resistance strain gauge with two or more sensitive grids of different axes, used to determine the magnitude and direction of the principal strain in a plane stress field.

[0026] It is worth noting that the next measurement will require disassembling box 2 and cleaning the soil sample inside.

[0027] The housing 2 includes a fixed frame 201 installed on the top of the base 1. The fixed frame 201 has an installation groove 202 inside, and a sealing plate 203 is inserted into the fixed frame 201. Fixed bolts 11 are installed on the fixed frame 201, and screw holes 12 are opened in the installation groove 202. The sealing plate 203 has an opening 8 for the pipe 9 to enter the housing 2. The sealing plate 203 is snapped into the installation groove 202 on the fixed frame 201 to form the housing 2. The fixed bolts 11 are inserted through the fixed frame 201 into the screw holes 12 on the sealing plate 203 to reinforce the sealing plate 203 and improve the overall sturdiness of the housing 2.

[0028] The limiting assembly 10 includes a fixed base 1001 fixedly connected to the sealing plate 203. A second hydraulic rod 1002 is fixedly connected to the bottom of the fixed base 1001. A connecting frame 1003 is fixedly connected to the piston rod of the second hydraulic rod 1002. A connecting rod 1004 is rotatably connected to the connecting frame 1003. A sliding groove 13 is provided on the connecting frame 1003. A rotating shaft is fixedly connected to the connecting rod 1004 and slides in the sliding groove 13. Connecting rods 1004 are installed on both sides of the connecting frame 1003, and the rotating shafts on the connecting rods 1004 can slide in the sliding groove 13. While rotating in the groove 13, the rod slides; a clamping plate 1005 is rotatably connected to the connecting rod 1004. The two connecting rods 1004 and the clamping plate 1005 are mirror images mounted on the connecting frame 1003. A connecting shaft 1006 is fixedly connected to the connecting rod 1004. The connecting shaft 1006 is rotatably connected to the sealing plate 203, and the connecting shaft 1006 limits the connecting rod 1004 to the sealing plate 203. The connecting frame 1003 is driven to move upward by the second hydraulic rod 1002, and the connecting frame 1003 drives the connecting rod 1004 to rotate in the groove 13 while sliding. Figure 4 As shown, the pipe moves towards the center, thereby causing the two clamping plates 1005 to move towards the center synchronously, clamping and fixing the pipe 9 in the opening 8. By reversing the operation, the pipe 9 can be released for replacement and disassembly.

[0029] Furthermore, two sets of symmetrical reinforcing plates 14 are fixedly connected to the base 1, which can improve the stability of the base 1 during operation.

[0030] Working Principle: The first hydraulic rod 5, the second hydraulic rod 1002, and the strain gauge 7 in this application are all existing publicly available technologies. Their specific structures and working principles are common knowledge to those skilled in the art. Their combined application and parameter optimization are conventional technical means in this field. When inspecting the pipe 9, the strain gauge 7 is attached to the corresponding position of the pipe 9 and inserted into the opening 8 in the sealing plate 203. According to the size of the pipe 9, the limiting component 10 is adjusted to hold the pipe 9. In specific operation, the second hydraulic rod 1002 drives the connecting frame 1003 to move upward. The connecting frame 1003 drives the connecting rod 1004 to rotate in the slide groove 13. Figure 4 The pipe 9 moves towards the center, causing the two clamping plates 1005 to move synchronously towards the center, clamping and fixing the pipe 9 in the opening 8. By reversing the operation, the pipe 9 can be released and replaced or disassembled. After the pipe 9 is fixed, the first hydraulic rod 5 drives the pressure plate 6 to press down on the soil sample inside the box 2, thereby applying pressure to the pipe 9. The strain gauge 7 is used to detect the magnitude and direction of the strain force. With the "INV2366 bus static strain test analyzer", the relationship between the longitudinal stress and circumferential stress of the pipe 9 and the angle of the pipe 9 can be analyzed. The box 2 is a detachable structure. The sealing plate 203 is snapped into the mounting groove 202 on the fixing frame 201 to form the box 2. The fixing bolt 11 is installed through the fixing frame 201 into the screw hole 12 on the sealing plate 203 to reinforce the sealing plate 203 and improve the overall firmness of the box 2. After the sealing plate 203 is removed from the fixing frame 201, it is convenient to maintain the inside of the box 2 and clean the soil sample.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil box load device for testing the external pressure performance of buried pipelines, comprising a base (1), characterized in that, Also includes: The housing (2) is installed on the top of the base (1). A fixing frame (3) is installed on the base (1). A mounting seat (4) is fixedly installed on the fixing frame (3). A first hydraulic rod (5) is fixedly connected to the mounting seat (4). A pressure plate (6) is fixedly connected to the piston rod of the first hydraulic rod (5). Pipe (9) is installed inside the box (2). Strain rosette (7) is pasted on the outer surface of the pipe (9). A limiting component (10) for clamping and limiting the pipe (9) is installed on the outside of the box (2). The limiting component (10) includes a fixed seat (1001) fixedly connected to the sealing plate (203). A second hydraulic rod (1002) is fixedly connected to the bottom of the fixed seat (1001). A connecting frame (1003) is fixedly connected to the piston rod of the second hydraulic rod (1002). A connecting rod (1004) is rotatably connected to the connecting frame (1003). A clamping plate (1005) is rotatably connected to the connecting rod (1004). A connecting shaft (1006) is fixedly connected to the connecting rod (1004). The connecting shaft (1006) is rotatably connected to the sealing plate (203).

2. The soil box loading device for testing the external pressure performance of buried pipelines according to claim 1, characterized in that: The housing (2) includes a fixed frame (201) installed on the top of the base (1), and the fixed frame (201) has an installation groove (202) inside, and a sealing plate (203) is inserted into the fixed frame (201).

3. The soil box loading device for testing the external pressure performance of buried pipelines according to claim 2, characterized in that: The fixing frame (201) is equipped with fixing bolts (11), and the mounting groove (202) is provided with screw holes (12).

4. The soil box loading device for testing the external pressure performance of buried pipelines according to claim 2, characterized in that: The sealing plate (203) has an opening (8) for the pipe (9) to enter the box (2).

5. The soil box loading device for testing the external pressure performance of buried pipelines according to claim 4, characterized in that: The connecting frame (1003) is provided with a sliding groove (13), and a rotating shaft is fixedly connected to the connecting rod (1004), which slides in the sliding groove (13).

6. The soil box loading device for testing the external pressure performance of buried pipelines according to claim 5, characterized in that: Two sets of symmetrical reinforcing plates (14) are fixedly connected to the base (1).

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