Pipe-soil interface slip observation device and method

Abstract

The present invention discloses a pipe-soil interface slip observation device and method, belonging to the technical field of measuring devices. The device comprises a plurality of auxiliary reading grid groups drawn on the surface of a pipe, each auxiliary reading grid group including a plurality of auxiliary reading grids arranged along the circumference of the pipe; a plurality of endoscopes corresponding to the plurality of auxiliary reading grids, for respectively obtaining images of the plurality of auxiliary reading grid positions before and after displacement changes; a plurality of position limiting protective caps corresponding to the plurality of endoscopes, the plurality of position limiting protective caps being respectively sleeved on the outside of the corresponding endoscopes, the plurality of position limiting protective caps being in contact with the surface of the pipe at their ends proximal to the pipe, and a position limiting structure being provided on the inner wall of the position limiting protective caps for limiting the position of the endoscopes so that the endoscopes always maintain an optimal shooting focal length during the recording process. The present invention can relatively accurately obtain the amount of slip on the pipe-soil interface while minimizing the impact on the contact state of the pipe-soil interface.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring devices, and in particular relates to a pipe-soil interface slip observation device and method. Background Art

[0002] Under the action of load, there is often a large shear stress at the interface between soil and structural materials, which is caused by the inconsistent deformation of the two materials.

[0003] For example, consider the interface between the concrete cutoff wall and the soil in an earth dam. While the concrete deforms minimally, the soil experiences significant compression under load. The soil, experiencing frictional resistance from the wall, transfers the load to the wall through shear stress. Similarly, in pipe-soil structures, the forces acting on buried pipelines are also influenced by this interfacial force transfer.

[0004] Therefore, for such structures, it is very important to correctly analyze the stress-deformation mechanism, the development of shear failure, and the load transfer process on the contact surface and simulate them correctly in the calculation. However, based on existing technologies, the interface slip is often difficult to obtain. Summary of the Invention

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A pipe-soil interface slip observation device, comprising:

[0007] A pipeline buried in the soil, with a plurality of auxiliary reading grid groups drawn on the surface of the pipeline, the plurality of auxiliary reading grid groups being arranged at intervals along the length direction of the pipeline, and each of the auxiliary reading grid groups comprising a plurality of auxiliary reading grids arranged along the circumference direction of the pipeline;

[0008] a plurality of endoscopes, each of the endoscopes being arranged in a one-to-one correspondence with a plurality of auxiliary reading grids, and being used to respectively obtain images of the positions of the plurality of auxiliary reading grids before and after the displacement change;

[0009] A plurality of hollow-structured position-limiting protective caps are provided, and the plurality of position-limiting protective caps are arranged in one-to-one correspondence with the plurality of endoscopes. The plurality of position-limiting protective caps are respectively sleeved on the outer sides of the corresponding endoscopes, and the ends of the plurality of position-limiting protective caps close to the pipe are all in contact with the surface of the pipe. A limiting structure is provided on the inner wall of the position-limiting protective cap for limiting the endoscope so that the endoscope always maintains the optimal shooting focal length during the shooting process.

[0010] Furthermore, the distance between the limiting structure and the front end of the limiting protection cap is consistent with the focal length of the endoscope.

[0011] Furthermore, the endoscope is an industrial-grade high-definition short-focus endoscope with a focal length of 5 mm.

[0012] Furthermore, the auxiliary reading grid is a square with a side length of 15-25 mm and a spacing of 1 mm.

[0013] Furthermore, the lens end of the endoscope is provided with a fill light.

[0014] Furthermore, the endoscope is electrically connected to a data processing device.

[0015] Furthermore, the position limiting protection cap is made of transparent plastic material.

[0016] A pipe-soil interface slip observation method, using any of the pipe-soil interface slip observation devices described above, the method comprising the following steps:

[0017] S10, installing the endoscope in the position-limiting protective cap, and burying the position-limiting protective caps after the endoscope is installed at different positions on the surface of the pipeline;

[0018] S20, observing the grid and labels on the interface, and obtaining the initial positions of the endoscope at different positions;

[0019] S30, loading the upper load of the pipeline and soil, observing the grid and labels on the interface, and obtaining the relative displacement of the pipeline and soil at different positions after loading;

[0020] S40, respectively, by comparing the position after endoscope loading with the initial position, the slip amount (Δ) of the pipe-soil interface at different positions can be obtained.

[0021] Beneficial effects:

[0022] The present invention can more accurately obtain the slip amount on the pipe-soil interface under the condition of less influence on the contact state of the pipe-soil interface.

[0023] The transparent limiting protection cap of the present invention is made of plastic material, which effectively protects the endoscope lens from being squeezed by surrounding soil.

[0024] The transparent limiting protective cap of the present invention is made of transparent material, which effectively ensures the reading effect of the endoscope.

[0025] The industrial-grade high-definition short-focus endoscope lens end of the present invention is provided with a fill light, which effectively ensures the reading effect of the endoscope in dark places. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the transparent limiting protective cap of the present invention;

[0028] Figure 3 Schematic diagram of the measurement principle of the present invention.

[0029] Among them, 1. Endoscope; 2. Limit protection cap; 3. Auxiliary reading grid; 4. Limit structure. DETAILED DESCRIPTION

[0030] Example 1

[0031] refer to Figure 1 - Figure 3 , a pipe-soil interface slip observation device, comprising:

[0032] A pipeline buried in the soil has multiple auxiliary reading grid groups drawn on the surface of the pipeline. The multiple auxiliary reading grid groups are arranged at intervals along the length direction of the pipeline. Each auxiliary reading grid group includes multiple auxiliary reading grids 3 arranged along the circumference direction of the pipeline.

[0033] A plurality of endoscopes 1 are provided, each of the plurality of endoscopes 1 and the plurality of auxiliary reading grids 3 corresponding to each other, and used to respectively obtain images before and after the displacement change of the positions of the plurality of auxiliary reading grids 3;

[0034] Multiple limiting protective caps 2 with hollow structures are provided, and the multiple limiting protective caps 2 are arranged in a one-to-one correspondence with the multiple endoscopes 1. The multiple limiting protective caps 2 are respectively sleeved on the outside of the corresponding endoscopes 1, and the ends of the multiple limiting protective caps 2 close to the pipe are all in contact with the surface of the pipe. The inner wall of the limiting protective cap 2 is provided with a limiting structure 4, which is used to limit the endoscope 1 so that the endoscope 1 always maintains the best shooting focal length during the shooting process.

[0035] In this embodiment, the position-limiting protective cap 2 is used to protect the endoscope.

[0036] Preferably, the printing method of the auxiliary reading grid 3 drawn on the pipeline surface is the same as the printing method of the original font on the pipeline.

[0037] Preferably, the limiting structure is a limiting block or a limiting ring.

[0038] The present invention protects the industrial-grade high-definition short-focus endoscope through the transparent limiting protective cap, thereby reducing the impact on the use effect of the endoscope buried in the soil due to being squeezed by the surrounding soil.

[0039] The present invention can more accurately obtain the slip amount on the pipe-soil interface under the condition of less influence on the contact state of the pipe-soil interface.

[0040] In this embodiment, the distance between the limiting structure and the front end of the limiting protection cap 2 is consistent with the focal length of the endoscope 1 .

[0041] Preferably, the endoscope 1 is an industrial-grade high-definition short-focus endoscope 1 with a focal length of 5 mm, and the distance between the limiting structure and the front end of the limiting protection cap 2 is 5 mm.

[0042] In this embodiment, the auxiliary reading grid is a square with a side length of 15-25 mm and a spacing of 1 mm.

[0043] Preferably, the side length is 20 mm.

[0044] In this embodiment, the lens end of the endoscope 1 is provided with a fill light.

[0045] The present invention effectively ensures the reading effect of the endoscope in dark places by arranging the supplementary light.

[0046] In this embodiment, the endoscope 1 is electrically connected to a data processing device.

[0047] In this embodiment, the position limiting protection cap 2 is made of transparent plastic.

[0048] The position limiting protection cap of the present invention is made of a transparent material, which effectively ensures the reading effect of the endoscope, and is made of a plastic material, which effectively protects the endoscope lens from being squeezed by the surrounding soil.

[0049] Example 2

[0050] refer to Figure 3 This embodiment provides a pipe-soil interface slip observation method, using the pipe-soil interface slip observation device provided in Example 1, and the method includes the following steps:

[0051] S10, installing the endoscope 1 in the position limiting protective cap 2, and burying the position limiting protective caps 2 after the endoscope 1 is installed at different positions on the surface of the pipeline;

[0052] S20, observing the auxiliary reading grid 3 and labels on the interface, and obtaining the initial positions of the endoscope 1 at different positions respectively;

[0053] S30, loading the upper load of the pipeline and soil, observing the grid and labels on the interface, and obtaining the relative displacement of the pipeline and soil at different positions after loading;

[0054] S40, respectively, by comparing the position after endoscope loading with the initial position, the slip amount (Δ) of the pipe-soil interface at different positions can be obtained.

[0055] In this embodiment, the direction of the initial position of the endoscope 1 is the radial direction of the pipe.

[0056] Non-uniform deformation fields are a prominent feature of soil-structure interactions and certain non-uniform geotechnical materials. During the process of bearing upper loads, due to differences in properties such as the deformation modulus of the soil and pipe, the pipe and soil at the same point on the initial contact surface experience inconsistent displacements after loading, resulting in a misalignment between the pipe and the surrounding soil. This misalignment is the relative displacement of the contact surface that this device aims to observe. By observing the grid and labels on the interface at the start of the test and after applying pressure, the slip (Δ) at the pipe-soil interface can be determined.

[0057] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A pipe-soil interface slip observation device, characterized in that: include: A pipeline buried in the soil, with a plurality of auxiliary reading grid groups drawn on the surface of the pipeline, the plurality of auxiliary reading grid groups being arranged at intervals along the length direction of the pipeline, and each of the auxiliary reading grid groups comprising a plurality of auxiliary reading grids arranged along the circumference direction of the pipeline; a plurality of endoscopes, each of the endoscopes being arranged in a one-to-one correspondence with a plurality of auxiliary reading grids, and being used to respectively obtain images of the positions of the plurality of auxiliary reading grids before and after the displacement change; A plurality of hollow position-limiting protective caps, each corresponding to the plurality of endoscopes, are respectively sleeved on the outside of the corresponding endoscopes, and the ends of the position-limiting protective caps close to the pipes abut against the surface of the pipes. A position-limiting structure is provided on the inner wall of the position-limiting protective caps for limiting the position of the endoscopes so that the endoscopes always maintain an optimal shooting focal length during the video recording process; During the process of bearing the upper load, due to the differences in the deformation modulus characteristics of the soil and the pipe, the displacements of the pipe and soil at the same point on the initial contact surface after loading are inconsistent, resulting in a misalignment between the pipe and the surrounding soil. This misalignment is the relative displacement of the contact surface that needs to be observed. By observing the grid and label on the interface at the endoscope position at the beginning of the test and after the pressure is applied, the slip (Δ) of the pipe-soil interface can be obtained.

2. The pipe-soil interface slip observation device according to claim 1, characterized in that: The distance between the limiting structure and the front end of the limiting protection cap is consistent with the focal length of the endoscope.

3. The pipe-soil interface slip observation device according to claim 1, characterized in that: The endoscope is an industrial-grade high-definition short-focus endoscope with a focal length of 5 mm.

4. The pipe-soil interface slip observation device according to claim 1, characterized in that: The auxiliary reading grid is a square with a side length of 15-25 mm and a spacing of 1 mm.

5. The pipe-soil interface slip observation device according to claim 1, characterized in that: The lens end of the endoscope is provided with a fill light.

6. The pipe-soil interface slip observation device according to claim 1, characterized in that: The endoscope is electrically connected to the data processing device.

7. The pipe-soil interface slip observation device according to claim 1, characterized in that: The limit protection cap is made of transparent plastic.

8. A method for observing pipe-soil interface slip, characterized in that: Using the pipe-soil interface slip observation device according to any one of claims 1 to 7, the method comprises the following steps: S10, installing the endoscope in the position-limiting protective cap, and burying the position-limiting protective caps after the endoscope is installed at different positions on the surface of the pipeline; S20, observing the grid and labels on the interface, and obtaining the initial positions of the endoscope at different positions; S30, loading the upper load of the pipeline and soil, observing the grid and labels on the interface, and obtaining the relative displacement of the pipeline and soil at different positions after loading; S40. Subtract the initial position from the position after endoscope loading to obtain the slip amount (Δ) of the pipe-soil interface at different positions.

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