Model test device suitable for pipe-jacking construction technology of undercrossing riverway pipeline

Abstract

The utility model relates to a model test device suitable for a pipe-jacking construction technology of an underpass riverway pipeline, which comprises a model box body, two side walls of the model box body in the length direction are respectively provided with at least three strip-shaped holes, and the side edge of each strip-shaped hole is provided with a closing door capable of being opened and closed; a pipeline is transversely inserted into strip-shaped holes which are oppositely distributed in the two side walls in a penetrating mode, the two ends of the pipeline extend out of the side walls of the model box body, jacks are connected to the two ends of the pipeline in an abutting mode, and an arch-shaped supporting unit is inserted into the lower portion of the pipeline and movably located in the model box body; model piers are arranged on the two sides in the width direction in the model box body, the model box body is filled with a plurality of soil layers, each layer is tamped, water layers are arranged on the soil layers, and vibrating wire type miniature pressure boxes used for monitoring pressure changes of foundation soil near the model piers after a pipeline sinks are buried in the soil layers. According to the utility model, different distances between the jacking pipe and the pier can be tested and researched by one model test device.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline construction simulation, and in particular relates to a model test device suitable for the pipe jacking construction technology of a pipeline passing through a river channel. Background Art

[0002] In the construction of urban drainage pipelines, trenchless methods are often used to construct drainage pipelines, using the jacking construction method to pass under the river. There are often bridge piers across the river in the river. When the pipeline passes through the river, if the distance between the pipeline and the pier is close, the construction process is easy to cause deformation of the pier foundation soil, affecting the stability of the pier. However, in reality, the model test device that uses the jacking construction method to pass under the river has a relatively single size of the model box, that is, the distance between the jacking pipe and the pier is fixed, which brings certain inconveniences to the test research. The versatility of a model box is not strong, which invisibly increases the test cost. Utility Model Content

[0003] The utility model aims to overcome the shortcomings of the prior art and provide a model test device suitable for the pipe jacking construction technology of a pipeline under a river channel. The model test device can test and study different distances between the pipe jacking and the bridge pier.

[0004] The purpose of the utility model is achieved through the following technical scheme. The model test device suitable for the pipe jacking construction technology of the pipeline under the river channel comprises a model box, at least three strip holes are arranged on the two side walls in the length direction of the model box, and a closed door that can be opened and closed is installed on the side of each strip hole; pipes are horizontally inserted in the strip holes on the two side walls that are relatively distributed, both ends of the pipes extend out of the side walls of the model box, and both ends of the pipes are top-connected with jacks, an arch support unit is inserted under the pipe, and the arch support unit is movably located in the model box; model piers are arranged on both sides in the width direction of the model box, several layers of soil are filled in the model box and each layer is compacted, a water layer is arranged on the soil layer, and a vibrating wire type micro pressure box for monitoring the change of foundation soil pressure near the model pier after the pipeline sinks is buried in the soil layer.

[0005] The beneficial effects of the utility model are as follows: compared with the prior art, by arranging at least three strip holes on the two side walls of the model box, a model test device can test and study different distances between the top pipe and the bridge pier; a closed door is installed in the strip hole, so that when the soil layer is filled in the model box, there will be no leakage to the outside; an arch support unit is inserted under the pipeline, so that there is no soil layer under the pipeline, and when the arch support unit is withdrawn and the jack is lowered, the pipeline can be lowered smoothly, so that an effective test can be obtained.

[0006] Preferably, the strip holes are arranged along the height direction of the model box and arranged in sequence along the width direction of the model box, and the bottom of the strip holes is connected to the bottom of the model box, the height of the strip holes is twice the diameter of the pipe, and the pipe is fitted with the side wall of the strip holes in the width direction; through the setting of the above structure, the pipe can smoothly descend to the bottom of the model box, and no lateral displacement will occur during the descent, thus ensuring effective testing.

[0007] Preferably, two arched support units are provided, the added length of the two arched support units is equal to the length of the model box, and the length of a single arched support unit is less than the protruding length of the pipe protruding from the side wall of the model box; through the arrangement of the above structure, it is convenient for the arched support unit to be pulled out of the model box.

[0008] Preferably, the arch support unit includes an arch frame and a sliding door panel frame, the sliding door panel frame is welded and fixed to one end of the arch frame, the arch frame is located below and in contact with the pipe, and the sliding door panel frame is flush with the side wall of the model box; through the arrangement of the above structure, the arch support unit is more convenient to operate when it is pulled out of the model box.

[0009] Preferably, the surrounding side walls of the model box and the closed door are made of acrylic plates; this makes it easier for test personnel to observe changes in the soil and water layers in the model box in a timely manner, making the test more effective.

[0010] Preferably, the connecting line of the model bridge piers arranged on both sides of the model box is cross-distributed with the axis of the pipeline; thus, the influence of pipeline sinking on the settlement of the strata near the bridge piers can be effectively analyzed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the main cross-sectional structure of the model test device of the utility model.

[0012] Figure 2 It is a side structural schematic diagram of the model test device of the utility model.

[0013] The numbers in the accompanying drawings are: 1, model box; 2, strip hole; 3, closed door; 4, pipeline; 5, jack; 6, arch support unit; 7, model bridge pier; 8, soil layer; 9, water layer; 10, vibrating string micro pressure box; 11, side wall; 61, arch frame; 62, sliding door panel frame. DETAILED DESCRIPTION

[0014] The following is a detailed introduction to the utility model in conjunction with the accompanying drawings: Figure 1 , 2As shown, the utility model includes a model box 1, at least three strip holes 2 are provided on two side walls 11 in the length direction of the model box 1, and a closed door 3 that can be opened and closed is installed on the side of each strip hole 2; pipes 4 are horizontally inserted in the relatively distributed strip holes 2 on the two side walls 11, both ends of the pipes 4 extend out of the side walls 11 of the model box 1, and both ends of the pipes 4 are top-connected with jacks 5, and an arch support unit 6 is inserted below the pipe 4, and the arch support unit 6 is movably located in the model box 1; model bridge piers 7 are arranged on both sides in the width direction of the model box 1, and several layers of soil 8 are filled in the model box 1 and each layer is compacted, a water layer 9 is provided on the soil layer 8, and a vibrating string type micro pressure box 10 is buried in the soil layer 8 for monitoring the change of foundation soil pressure near the model bridge pier 7 after the pipe 4 sinks. The pipeline 4 mentioned above is made of reinforced concrete or steel pipe, and the soil layer is silty clay. This model test device simulates the construction of the pipeline under the river channel, tests the construction under different distances between the pipeline and the model pier, and monitors the deformation of the foundation soil around the pier and the lateral and vertical displacement of the pier at different distances, providing a reference for pipeline construction route selection and pier safety monitoring.

[0015] The strip hole 2 is arranged along the height direction of the model box 1 , and the bottom of the strip hole 2 is connected to the bottom of the model box 1 . The height of the strip hole 2 is twice the diameter of the pipe 4 , and the pipe 4 fits the side wall of the strip hole 2 in the width direction.

[0016] There are two arched support units 6 , the added length of the two arched support units 6 is equal to the length of the model box 1 , and the length of a single arched support unit 6 is less than the protruding length of the pipe 4 protruding from the side wall 11 of the model box 1 .

[0017] The arch support unit 6 includes an arch frame 61 and a sliding door frame 62. The sliding door frame 62 is welded and fixed to one end of the arch frame 61. The arch frame 61 is located below and in contact with the pipeline 4. The sliding door frame 62 is flush with the side wall 11 of the model box 1.

[0018] The surrounding side walls of the model box 1 and the closed door 3 are all made of acrylic plates.

[0019] The connecting line of the model bridge piers 7 arranged on both sides of the model box 1 is cross-distributed with the axis of the pipeline 4 .

[0020] The test process of the utility model is as follows: first, according to the test requirements of different distances between the pipeline 4 and the model bridge pier 7, the corresponding closed door 3 is opened, the pipeline 4 is inserted into the corresponding strip hole 2, the two ends of the pipeline 4 are lifted by the jack 5 and the pipeline 4 is butted against the top of the strip hole 2, and two arch support units 6 are respectively inserted from the two sides of the model box 1 to the bottom of the pipeline 4; then, the model bridge pier 7 and the vibrating wire micro pressure box 10 are placed in the model box 1, and the silty clay is filled in layers and compacted, and then the water layer 9 is poured on the soil layer 8; finally, after the experiment starts, the two arch support units 6 are respectively pulled out from the two sides of the model box 1, and the jack 5 is used to make the pipeline 4 drop to the bottom of the model box 1 or drop a distance of the diameter of the pipeline 4, and then the water in the model box 1 is pumped out, and the terrain is scanned by a three-dimensional scanner on the surface 8 of the soil layer to obtain terrain data. After computer processing, the influence of the pipeline sinking on the settlement of the stratum near the bridge pier is analyzed.

[0021] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A model test device suitable for pipe jacking construction technology of a pipeline under a river, comprising a model box (1), characterized in that: At least three strip holes (2) are provided on the two side walls (11) in the longitudinal direction of the model box (1), and a closed door (3) is installed on the side of each strip hole (2); pipes (4) are inserted transversely into the strip holes (2) on the two side walls (11) that are arranged opposite to each other, and both ends of the pipes (4) extend out of the side walls (11) of the model box (1), and both ends of the pipes (4) are connected to jacks (5), and a jack (5) is provided below the pipes (4). An arch support unit (6) is inserted, and the arch support unit (6) is movably located in the model box (1); model bridge piers (7) are arranged on both sides of the width direction of the model box (1); the model box (1) is filled with a plurality of soil layers (8) and each layer is compacted; a water layer (9) is provided on the soil layer (8); and a vibrating wire type micro pressure box (10) is buried in the soil layer (8) for monitoring the change of foundation soil pressure near the model bridge pier (7) after the pipeline (4) sinks.

2. The model test device for pipe jacking construction technology of pipelines under river crossing according to claim 1 is characterized in that: The strip holes (2) are arranged along the height direction of the model box (1) and are arranged in sequence along the width direction of the model box (1), and the bottom of the strip holes (2) is connected to the bottom of the model box (1). The height of the strip holes (2) is twice the diameter of the pipe (4), and the pipe (4) is in contact with the side wall of the strip holes (2) in the width direction.

3. The model test device suitable for the pipe jacking construction technology of the pipeline under the river according to claim 1 is characterized by: Two arched support units (6) are provided, the combined length of the two arched support units (6) is equal to the length of the model box (1), and the length of a single arched support unit (6) is less than the protruding length of the pipe (4) protruding from the side wall (11) of the model box (1).

4. The model test device suitable for the pipe jacking construction technology of the pipeline under the river according to claim 3 is characterized by: The arch support unit (6) comprises an arch frame (61) and a sliding door frame (62); the sliding door frame (62) is welded and fixed to one end of the arch frame (61); the arch frame (61) is located below and in contact with the pipeline (4); and the sliding door frame (62) is flush with the side wall (11) of the model box (1).

5. The model test device suitable for the pipe jacking construction technology of the pipeline under the river according to claim 1 is characterized by: The surrounding side walls of the model box (1) and the closed door (3) are all made of acrylic plates.

6. The model test device suitable for the pipe jacking construction technology of the pipeline under the river according to claim 1 is characterized by: The connecting line of the model bridge piers (7) arranged on both sides of the model box (1) is cross-distributed with the axis of the pipeline (4).

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