Soil arching effect testing device in pipeline jacking process
By designing a test device including a model box, a pipeline model unit, a jack and a vibrating micro pressure box, the problem that the existing technology cannot effectively study the soil arch effect, and the research on the soil arch effect under different pinch lengths is achieved, which has the advantages of simple structure and convenient testing.
Patent Information
- Application Number
- CN202421096966.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-05-20
AI Technical Summary
The existing pipeline ejection process soil arch effect test device cannot effectively study the soil arch effect under different ejection length conditions, and the device cannot adjust the ejection distance, and the movable door is fixed in position, which cannot meet the effective research needs for the earth arch effect.
A soil arch effect test device for the pipeline ejection process is designed, including a model box, a pipe model unit, a jack and a vibrating micro pressure box. The pipe model units are placed in sequence along the length of the strip opening, and each unit is topped with a jack below. A vibrating micro pressure box for monitoring soil pressure changes is arranged around each pipe model unit.
Through this device, each pipeline model unit represents the embedded length of the pipeline in the soil layer, which can effectively study the soil arch effect under different top-up length conditions. It has the advantages of simple structure and convenient testing, and can better study the soil arch effect.
Smart Images
Figure CN222825537U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of municipal pipeline jacking engineering, in particular to a soil arching effect test device in a pipeline jacking process. Background Art
[0002] Due to the accelerated pace of urbanization and the scarcity of land resources, more and more cities are turning their attention to underground projects. Pipe jacking is a commonly used trenchless tunnel construction technique in underground projects. This technology, with its advantages of low overall cost, minimal environmental impact, high construction efficiency, no disruption to traffic, and excellent safety, is gaining increasing popularity and is widely used in the construction of underground pipelines such as communication cables, power cables, gas pipelines, and municipal water supply and drainage.
[0003] However, this construction technique can easily cause the overburden to sink, resulting in a soil arching effect. Current experimental research devices for the soil arching effect during pipe jacking construction primarily utilize non-adjustable jacking distances, with movable doors set in fixed positions. This makes it difficult to effectively study the soil arching effect during pipe jacking. Utility Model Content
[0004] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a soil arch effect test device for the pipeline jacking process. The device takes into account the embedding length of the pipeline in the soil layer during the pipeline jacking process, and can study the soil arch effect caused by pipeline construction under different jacking length conditions.
[0005] The purpose of the utility model is achieved through the following technical solutions. The soil arch effect test device of the pipeline jacking process includes a model box, a strip opening is provided at the bottom of the model box, and a plurality of pipeline model units are placed at the strip opening. The pipeline model units are placed in sequence along the length direction of the strip opening, and a jack is connected to the bottom of each pipeline model unit. Both sides of each pipeline model unit are in contact with the two side walls in the width direction of the strip opening. Several layers of soil are filled in the model box and each layer is compacted; a vibrating string micro pressure box is arranged around each pipeline model unit for monitoring the changes in soil pressure in the soil layer during the sinking of the pipeline.
[0006] The beneficial effects of the present invention are as follows: compared with the prior art, a plurality of pipeline model units are arranged and connected one by one to the strip opening of the model box through jacks, and the pipeline model units are placed in sequence along the length direction of the strip opening. Through this test device, each pipeline model unit represents the embedded length of the pipeline in the soil layer during the pipeline jacking process, and the soil arch effect caused by pipeline construction under different jacking length conditions can be studied. It has the advantages of simple structure, convenient testing and effective research.
[0007] Preferably, the model box is placed on a support frame, and the support frame is provided with a shelf for placing the jack, and the upper plane of the shelf is lower than the upper plane of the support frame; through the arrangement of the above structure, the model box is more stable during the test, and the upper plane of the shelf is lower than the upper plane of the support frame, which facilitates the descent of the lifting end of the jack, so that the pipeline model unit can be separated from the soil layer, and an effective study of the soil arch effect of the detached section is obtained.
[0008] Preferably, the model box includes side panels and support panels, the side panels are provided with four pieces and are connected end to end to form a rectangular box frame, the support panel is fixed to the bottom of the rectangular box frame, and the strip opening is opened at the center of the support panel; through the arrangement of the above structure, the model box can be filled with soil and compacted from top to bottom, and the filling efficiency is better, and the strip opening is opened at the center of the support panel, so when a pipe model unit of the model box is separated from the soil layer, the effective study of the soil arch effect is more accurate.
[0009] Preferably, the side panels are made of acrylic panels; this allows the soil layer changes within the model box to be directly observed with the naked eye.
[0010] Preferably, the pipeline model unit includes a pipeline with a semicircular cross-section and a connecting plate, the connecting plate is fixed at the opening of the pipeline, and the two side walls of the connecting plate are fitted with the two side walls in the width direction of the strip opening, the upper plane of the connecting plate is flush with the upper plane of the support plate, and the pipeline is located in the model box; through the setting of the above structure, the connection between the pipeline model unit and the jack is more stable, and the two side walls of the connecting plate are fitted with the two side walls in the width direction of the strip opening, so that the soil layer will not leak out from the gap between the two, and the upper plane of the connecting plate is flush with the upper plane of the support plate, so that the semicircular pipeline can be completely embedded in the soil layer, and the soil arch effect can be effectively studied.
[0011] Preferably, the vibrating string micro pressure cell is located at the top of each of the pipeline model units and at the bottom of the model box near the side of the pipeline model unit; in this way, during the study of the soil arch effect, this position distribution of the vibrating string micro pressure cell makes it more accurate to monitor the changes in soil pressure during the sinking of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the main structure of the soil arching effect testing device of the present utility model.
[0013] Figure 2 The utility model is a schematic diagram of a side cross-sectional structure of a soil arching effect testing device.
[0014] The numbers in the accompanying drawings are: 1. model box; 2. pipeline model unit; 3. jack; 4. soil layer; 5. support frame; 6. shelf; 7. vibrating string micro pressure box; 11. strip opening; 12. side panel; 13. support plate; 21. pipeline; 22. connecting plate. DETAILED DESCRIPTION
[0015] The following is a detailed introduction to the present invention in conjunction with the accompanying drawings: Figure 1 、 2 As shown, the utility model includes a model box 1, a strip opening 11 is provided at the bottom of the model box 1, and a plurality of pipeline model units 2 are placed at the strip opening 11. The pipeline model units 2 are placed in sequence along the length direction of the strip opening 11, and a jack 3 is connected to the bottom of each pipeline model unit 2. Both sides of each pipeline model unit 2 are in contact with the two side walls in the width direction of the strip opening 11. Several layers of soil 4 are filled in the model box 1 and each layer is compacted; a vibrating string micro pressure box 7 for monitoring the changes in soil pressure during the sinking of the pipeline is arranged around each pipeline model unit 2.
[0016] The model box 1 is placed on a support frame 5 , and a shelf 6 for placing the jack 3 is provided on the support frame 5 , and the upper plane of the shelf 6 is lower than the upper plane of the support frame 5 .
[0017] The model box 1 includes side panels 12 and support panels 13 . The side panels 12 are provided with four pieces and connected end to end to form a rectangular box frame. The support panels 13 are fixed to the bottom of the rectangular box frame, and the strip opening 11 is opened at the center of the support panels 13 .
[0018] The side panels 12 are made of acrylic panels.
[0019] The pipeline model unit 2 includes a pipeline 21 with a semicircular cross-section and a connecting plate 22. The connecting plate 22 is fixed at the opening of the pipeline 21, and the two side walls of the connecting plate 22 are in contact with the two side walls in the width direction of the strip opening 11. The upper plane of the connecting plate 22 is flush with the upper plane of the support plate 13. The pipeline 21 is located in the model box 1.
[0020] The vibrating wire micro pressure cell 7 is located at the top of each pipeline model unit 2 and at the bottom of the model box 1 close to the side of the pipeline model unit 2 .
[0021] The specific operation process of the utility model is as follows: first, the assembled model box 1 is placed on the support frame 5; then, each pipeline model unit 2 is placed at the strip opening 11, and adjacent pipeline model units 2 are placed in sequence along the length direction of the strip opening 11, and each pipeline model unit 2 is topped with a jack 3, and the jack 3 is placed on the shelf 6, and the soil layer 4 is filled layer by layer in the model box 1, and each layer is given an appropriate filling thickness until it is filled to the designed height; finally, according to the position of the test jacking length, the corresponding pipeline model unit 2 is lowered by the jack 3, so that the pipeline model unit 2 is separated from the soil layer 4, while the pipeline model units 2 of other sections continue to maintain their original positions, and the soil arch effect of the soil layer 4 near the pipeline model unit 2 separated from the soil layer 4 is monitored and studied by the vibrating wire micro pressure box 7.
[0022] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.
Claims
1. A soil arching effect test device for a pipeline jacking process, comprising a model box (1), characterized in that: The bottom of the model box (1) is provided with a strip opening (11), and a plurality of pipeline model units (2) are placed at the strip opening (11). The pipeline model units (2) are placed in sequence along the length direction of the strip opening (11), and a jack (3) is connected to the top of each pipeline model unit (2). Both sides of each pipeline model unit (2) are in contact with the two side walls of the strip opening (11) in the width direction. The model box (1) is filled with a plurality of soil layers (4) and each layer is compacted. A vibrating wire type micro pressure box (7) for monitoring the change of soil pressure in the soil layer during the sinking process of the pipeline is arranged around each pipeline model unit (2).
2. The soil arching effect test device for the pipeline jacking process according to claim 1 is characterized in that: The model box (1) is placed on a support frame (5), and a shelf (6) for placing the jack (3) is provided on the support frame (5), and the upper plane of the shelf (6) is lower than the upper plane of the support frame (5).
3. The soil arching effect test device for the pipeline jacking process according to claim 1 is characterized in that: The model box (1) comprises side panels (12) and a support panel (13); the side panels (12) are provided with four pieces and are connected end to end to form a rectangular box frame; the support panel (13) is fixed to the bottom of the rectangular box frame; and the strip-shaped opening (11) is provided at the center of the support panel (13).
4. The soil arching effect test device for the pipeline jacking process according to claim 3 is characterized in that: The side panels (12) are made of acrylic panels.
5. The soil arching effect test device for the pipeline jacking process according to claim 3 is characterized in that: The pipeline model unit (2) comprises a pipeline (21) with a semicircular cross-section and a connecting plate (22); the connecting plate (22) is fixed at the opening of the pipeline (21); two side walls of the connecting plate (22) are in contact with two side walls of the strip opening (11) in a width direction; an upper plane of the connecting plate (22) is flush with an upper plane of the support plate (13); and the pipeline (21) is located in the model box (1).
6. The soil arching effect test device for the pipeline jacking process according to claim 1 is characterized in that: The vibrating wire type micro pressure box (7) is located at the top of each pipeline model unit (2) and at the bottom of the model box (1) close to the side of the pipeline model unit (2).