Improved TRAPDOOR test device

Abstract

The utility model relates to the technical field of geotechnical engineering, in particular to an improved TRAPDOOR test device which comprises a test box provided with a pipeline, a lower bearing platform is arranged in the test box, and an observation area is formed between the lower bearing platform and the top of the test box; a foundation is mounted above the lower bearing platform, and at least one movable door is arranged on the foundation; through the design of the displacement device, the movable door can be freely opened in a left-and-right or up-and-down balance mode so as to adapt to different types of experiment requirements, then the movable door can be freely opened in a left-and-right or up-and-down balance mode by adjusting the displacement amplitude of the movable door, and the movable door can be freely opened in the left-and-right or up-and-down balance mode so as to meet different types of experiment requirements. Different types of foundation subsidence, such as uniform subsidence and non-uniform subsidence, can be simulated, so that stress and deformation characteristics possibly generated when the buried pipeline encounters subsidence can be better analyzed and predicted, and the relationship between soil deformation and the pipeline bearing capacity can be further deeply discussed.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering technology, and in particular to an improved TRAPDOOR test device. Background Technology

[0002] With the acceleration of urbanization, buried pipelines are playing an increasingly important role in urban infrastructure. These pipelines not only undertake the critical task of transporting various media, but their stability is also directly related to public safety and the efficiency of urban operations. However, buried pipelines currently face a series of challenges, mainly including groundwater dewatering, pipeline leakage, and foundation settlement. These problems not only affect the stability of the pipelines but may also lead to pipeline bending, subsidence, or rupture, thereby damaging infrastructure and threatening public safety.

[0003] Especially for pipelines with large diameters, high internal pressures, and shallow burial depths, the soil pressure varies significantly at different locations. Localized subsidence can cause uneven stress and deformation of the pipeline, greatly increasing the risk of pipeline rupture. Therefore, studying the interaction between buried pipelines and the surrounding soil, as well as their bearing capacity, is crucial for ensuring the safe and stable operation of infrastructure.

[0004] Despite the progress made in the stability analysis of buried pipelines by existing research and technology, significant limitations remain. Traditional trapdoor tests, while simulating soil stress changes around the pipeline to some extent, primarily focus on vertical stress changes. This is because the trapdoor can only be controlled to move up and down, failing to provide further flexibility in positioning. Therefore, this testing method cannot delve into the relationship between soil deformation and pipeline bearing capacity, nor can it comprehensively assess the stability and safety of buried pipelines under actual complex geological conditions. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to achieve vertical movement control and the inability to achieve more positional variability, by proposing an improved TRAPDOOR test device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design an improved TRAPDOOR test apparatus, including a test chamber with pipes installed, a lower support installed inside the test chamber, and an observation area formed between the lower support and the top of the test chamber;

[0008] A foundation is installed above the lower pier, and at least one movable door is provided on the foundation.

[0009] A displacement device is provided below the test chamber to drive the angle adjustment of the movable door.

[0010] Furthermore, the foundation includes a top edge and two side edges, and a sand settling space is formed between the top edge, the two side edges and the lower support platform. A sand unloading valve is also connected to the bottom of the lower support platform.

[0011] Furthermore, the side is made of 10mm thick plexiglass sheet.

[0012] Furthermore, the pipeline is fixed inside the test chamber by a support rod, and the support rod is connected to the foundation.

[0013] The test chamber is further equipped with several pressure sensors on both sides of the pipe.

[0014] Furthermore, the displacement device includes two lead screw motors mounted on the bottom support of the test chamber, and the bottom of the movable door is fixedly connected with an ear block and a guide frame;

[0015] A rod is rotatably connected to the shaft end of the lead screw motor, and the rod is pinned to the lug block;

[0016] Another lead screw motor has a second rod rotatably connected to its shaft end, and the end of the second rod is fixedly mounted with a guide shaft that slides in the guide frame.

[0017] Furthermore, a displacement sensor is installed on the end face of the lower support platform, and the rod end of the displacement sensor abuts against the lower side of the movable door.

[0018] Furthermore, the test chamber is made of transparent material on all four sides and has an opening at the top.

[0019] The improved TRAPDOOR test device proposed in this utility model has the following advantages: Firstly, the design of the displacement device allows the movable door to open freely and balanced left and right or up and down to adapt to different types of experimental needs and improve flexibility. Secondly, by adjusting the displacement range of the movable door, different types of foundation settlement, such as uniform and non-uniform settlement, can be simulated, thereby better analyzing and predicting the stress and deformation characteristics that buried pipelines may experience when encountering settlement. This allows for a further in-depth exploration of the relationship between soil deformation and pipeline bearing capacity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the displacement device structure of this utility model.

[0022] In the diagram: 1. Test chamber; 11. Pipeline; 12. Support rod; 13. Pressure sensor; 2. Lower foundation; 3. Foundation; 31. Top edge; 32. Side edge; 33. Sand discharge valve; 4. Movable door; 5. Positioning device; 51. Screw motor; 52. Lug; 53. Guide frame; 54. Rod one; 55. Rod two; 56. Guide shaft; 6. Displacement sensor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Reference Figure 1-2 As one embodiment of this utility model, an improved TRAPDOOR test device is disclosed, including a test chamber 1 with a pipe 11 installed. Specifically, a lower support 2 is installed inside the test chamber 1, and an observation area is formed between the lower support 2 and the top of the test chamber 1. During the actual test, a filler is placed in the observation area, wherein the filler material is Fujian Pingtan sand, which has excellent particle size distribution and suitable compaction characteristics, and is very suitable for simulating settlement and deformation behavior in actual conditions, thereby improving the experimental effect and accuracy.

[0025] A foundation 3 is installed above the lower support platform 2. In this embodiment, the foundation 3 is movably placed above the lower support platform 2. At least one movable door 4 is provided on the foundation 3. Of course, those skilled in the art can also select the number of movable doors 4 according to actual needs. The specific setting method is only required for those skilled in the art to make equivalent substitutions according to this solution, and will not be elaborated here.

[0026] A displacement device 5 is provided below the test chamber 1 to drive the angle adjustment of the movable door 4. In this utility model, the displacement device 5 is designed to enable the movable door 4 to open freely and balanced left and right or up and down to adapt to different types of experimental needs and improve flexibility.

[0027] In some embodiments, the foundation 3 of this invention includes a top edge 31 and two side edges 32. A sand settling space is formed between the top edge 31, the two side edges 32 and the lower support 2. A sand discharge valve 33 is also connected to the bottom of the lower support 2. The sand discharge valve 33 is designed to allow the soil to flow into a sand bucket through a reserved sand discharge hole after the experiment, so as to realize the recycling and reuse of sand and soil, thereby saving costs, protecting the environment, and improving resource utilization efficiency.

[0028] Preferably, in this embodiment, the side edge 32 is a 10mm thick plexiglass plate. Of course, the top edge 31 can also be a glass plate, and its thickness can be selected by those skilled in the art, which will not be elaborated here.

[0029] Based on the above embodiments, in this utility model, the pipe 11 is fixed inside the test chamber 1 by a support rod 12, and the support rod 12 is connected to the foundation 3;

[0030] The test chamber 1 is equipped with several pressure sensors 13 on both sides of the pipe 11. The pressure sensors 13 can monitor and record the changes in soil pressure at different locations in real time, providing key data support for engineering safety and helping to optimize the design of underground facilities. The pressure sensors 13 are connected to the monitoring data acquisition instrument through a dedicated wire. The data acquisition instrument is then connected to a computer to record experimental data, realizing automated monitoring and analysis functions and improving work efficiency.

[0031] In a preferred embodiment, the displacement device 5 of this utility model includes two lead screw motors 51 mounted on the bottom support of the test chamber 1, and the bottom of the movable door 4 is fixedly connected with an ear block 52 and a guide frame 53;

[0032] A rod 54 is rotatably connected to the shaft end of the lead screw motor 51, and the rod 54 is pin-connected to the lug 52;

[0033] Another lead screw motor 51 has a second rod 55 rotatably connected to its shaft end, and a guide shaft 56 that slides in the guide frame 53 is fixedly installed at the end of the second rod 55.

[0034] In other words, in this embodiment, two lead screw motors 51 are used to control a movable door 4. Since a guide frame 53 is installed on one side of the bottom of the movable door 4, when the two lead screw motors 51 move synchronously, the movable door 4 can be controlled to move up and down as a whole. When one lead screw motor 51 moves and the other lead screw motor 51 does not work, the movable door 4 can be controlled to rotate to achieve the purpose of tilt angle control.

[0035] The purpose of this design is to enable the movable door 4 to open freely and in a balanced manner, either left and right or up and down, to meet the needs of different types of experiments and improve flexibility. Secondly, by adjusting the displacement range of the movable door 4, different types of foundation settlement, such as uniform settlement and non-uniform settlement, can be simulated, thereby better analyzing and predicting the stress and deformation characteristics that may occur when buried pipelines encounter settlement.

[0036] In addition, a displacement sensor 6 is installed on the end face of the lower support platform 2 in this utility model. The rod end of the displacement sensor 6 abuts against the lower side of the movable door 4, and the movable door 4 is precisely controlled by the displacement sensor 6.

[0037] In addition, during the experiment, a micro-single digital camera can be placed at a fixed point in front of the test chamber 1 to continuously record the soil deformation process through timed interval shooting mode. At the same time, 50W LED supplementary lights are placed on both sides, with the light source at a 45° angle to the front of the test chamber 1 to ensure uniform and stable light source. The entire experimental environment is kept in a dark room state to reduce interference and ensure good lighting conditions, thus forming a model test device.

[0038] It should be noted that, in this embodiment, the test chamber 1 is made of transparent parts on all four sides and has an opening at the top. The frame of the test chamber 1 is made of steel structure, and the transparent parts can be made of glass plates. The pressure sensor 13 can be installed on the glass plate. The upper observation area of ​​the test chamber 1 is an open rectangular structure. Its front is made of tempered glass, and the other sides are made of steel plate structure. This design not only facilitates high-definition image shooting by digital camera, but also ensures structural stability and can withstand a certain amount of external force during the test.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An improved TRAPDOOR test apparatus, comprising a test chamber (1) on which pipes (11) are installed, characterized in that: A lower support platform (2) is installed inside the test chamber (1), and an observation area is formed between the lower support platform (2) and the top of the test chamber (1); A foundation (3) is installed above the lower support platform (2), and at least one movable door (4) is provided on the foundation (3); A displacement device (5) is provided below the test chamber (1) to drive the angle adjustment of the movable door (4).

2. The improved TRAPDOOR test apparatus according to claim 1, characterized in that: The foundation (3) includes a top edge (31) and two side edges (32). A sand settling space is formed between the top edge (31), the two side edges (32) and the lower support (2). A sand discharge valve (33) is also connected to the bottom of the lower support (2).

3. The improved TRAPDOOR test apparatus according to claim 2, characterized in that: The side (32) is a 10mm thick plexiglass sheet.

4. The improved TRAPDOOR test apparatus according to claim 1, characterized in that: The pipe (11) is fixed inside the test chamber (1) by a support rod (12), and the support rod (12) is connected to the foundation (3); The test chamber (1) is equipped with several pressure sensors (13) on the inner side of the test chamber (1) surrounding both sides of the pipe (11).

5. The improved TRAPDOOR test apparatus according to claim 1, characterized in that: The displacement device (5) includes two lead screw motors (51) installed on the bottom bracket of the test chamber (1), and the bottom of the movable door (4) is fixedly connected with an ear block (52) and a guide frame (53); A rod (54) is rotatably connected to the shaft end of one of the lead screw motors (51), and the rod (54) is pin-connected to the lug (52); Another lead screw motor (51) has a shaft end rotatably connected to a second rod (55), and the end of the second rod (55) is fixedly mounted with a guide shaft (56) that slides in the guide frame (53).

6. The improved TRAPDOOR test apparatus according to claim 1, characterized in that: A displacement sensor (6) is installed on the end face of the lower support (2), and the rod end of the displacement sensor (6) abuts against the lower side of the movable door (4).

7. An improved TRAPDOOR test apparatus according to any one of claims 1-6, characterized in that: The test chamber (1) is made of transparent material on all four sides and has an opening at the top.

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