Fluid solidified soil surrounding pouring test device and method for pile foundation scouring repair

Abstract

The invention belongs to the technical field of civil engineering, and provides a flow-state solidified soil surrounding pouring test device for pile foundation scouring repair, which comprises an organic glass hollow column, a sand tank, a pit scouring mold, a mechanical rotating device, a slurry pumping pipe, a slurry feeding pipe and a slurry pumping machine. The bottom of the organic glass hollow column is vertically fixed in the sand tank, and the top of the organic glass hollow column extends above the sand tank; the pit punching die is formed by connecting a vertical protection wall and a cone-frustum-shaped bottom shell. The mechanical rotating device is composed of a sleeve, an overhanging arm, a bearing, a rotating main ring, a rotating arm with checks and a double-V-shaped clamping opening, and the components are connected through screws. The novel device is designed for simulating the pumping and pouring process of the actual flow-state solidified soil, the device meets the requirements of various working conditions by adjusting and controlling the pouring position, the pouring mode and the like, the retention rule of the solidified soil in a complex flow field is explored, and the device has great significance in improving the reliability and economical efficiency of the solidified soil scouring repair technology.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and particularly relates to a flowable solidified soil surrounding pouring test device and method for pile foundation scour repair. Background Art

[0002] The pile foundations of water-crossing and sea-crossing bridges, port terminals, offshore wind turbines and other water-related projects are prone to local scour erosion under complex hydrodynamic conditions, which in turn causes a series of safety problems such as a decrease in the bearing capacity of the pile foundation and structural instability. Traditional scour protection measures can be divided into active measures and passive measures. Active measures such as auxiliary piles and turbulence rings aim to protect the pile column by changing the flow field structure around the pile, but the application scenarios of active measures are few; passive measures such as riprap and sandbags achieve scour protection by enhancing the scour resistance of the bottom bed around the pile. Although this measure is widely used, there are still problems such as shear failure, edge scour failure, unstable protection effect and high maintenance cost. In recent years, as a low-carbon and environmentally friendly material, solidified soil has gradually been applied to the field of scour repair due to its advantages such as convenient construction and remarkable repair effect. Solidified soil has high fluidity in the initial stage after being mixed, which enables it to be blown to the periphery of the pile column through a pumping pipeline before forming a solidified soil with a certain scour resistance. However, flowable solidified soil is easily affected by the complex flow field around the pile column during the pumping process, and there are problems of being washed away and easily lost, resulting in reduced repair efficiency and material waste. Therefore, studying the retention performance of solidified soil during the pouring process will provide guidance for the engineering practice of solidified soil.

[0003] At present, the research on the flowable solidified soil scour repair technology is still in its infancy, and there is also little research on the development of a test device for surrounding pouring of flowable solidified soil around the pile. Chinese Patent CN113700055A discloses a test method for simulating the scour of solidified soil during the construction of an offshore wind power pile, which can simulate the pouring and solidification process of flowable solidified soil in the scour pit topography around a single pile column model and evaluate the scour depth and loss rate of solidified soil under various processes. However, this method does not mention the specific methods for adjusting and controlling the pouring position, pouring method, and pouring speed of solidified soil, and this method lacks consideration of the research on the retention amount and other aspects reflecting the scour resistance performance of solidified soil in the initial stage after the pouring of flowable solidified soil is completed. Therefore, developing a flowable solidified soil surrounding pouring test device for pile foundation scour repair, and exploring the retention law of solidified soil under the complex flow field around the pile column by adjusting and controlling the pouring position, pouring method, and pouring speed, is of great significance for improving the reliability and economy of the solidified soil scour repair technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a flowable solidified soil surrounding pouring test device for pile foundation scour repair to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A flow-state solidified soil surrounding pouring test device for pile foundation scour repair, comprising a fixed column 6, a sand tank 5, a scour pit mold 3, a mechanical rotating device 2, a slurry pumping pipe 1, a slurry feeding hose 18, a slurry feeding hard pipe 19, and a slurry pump 4;

[0007] The bottom of the fixed column 6 is vertically fixed in the sand tank 5, and the lower end of the fixed column 6 is externally sleeved with the scour pit mold 3. The scour pit mold 3 is used for pouring slurry to provide a containing space; and the plane where the outer edge of the scour pit mold 3 is located is flush with the upper surface of the sand tank 5. The mechanical rotating device 2 is arranged at the top of the fixed column 6 and can clamp and drive the slurry pumping pipe 1 to rotate circumferentially and swing radially. The top pipe orifice of the slurry pumping pipe 1 is sequentially externally connected with the slurry feeding hose 18, the slurry feeding hard pipe 19 and the slurry pump 4, and the bottom extends between the scour pit mold 3 and the mechanical rotating device 2.

[0008] Further, the mechanical rotating device 2 includes an outer sleeve 9, an outer extension arm 10, a bearing 11, a rotating main ring 12, a knurled screw 13, a rotating arm with squares 14, and a double V-shaped clamp 15;

[0009] The outer sleeve 9 is fixedly sleeved outside the fixed column 6. The inner ring of the bearing 11 is fixed to the outer sleeve 9, and the outer ring is fixed to the rotating main ring 12. A knurled screw 13 is arranged in the area between the outer sleeve 9 and the rotating main ring 12 where there is no bearing 11. The knurled screw 13 passes through the rotating main ring 12 from the outside to the inside. By tightening the knurled screw 13, its inner end abuts against the outer wall of the outer sleeve 9 to realize the fixation of the outer sleeve 9 and the rotating main ring 12. The outer extension arms 10 are circumferentially and uniformly fixed to the rotating main ring 12. The vertical end of the outer extension arm 10 is rotatably connected to the rotating arm with squares 14, and the positioning between the outer extension arm 10 and the rotating arm with squares 14 is realized by tightening the screw. The double V-shaped clamp 15 is arranged at the end of the rotating arm with squares 14, and the double V-shaped clamp 15 is used for clamping and pressing the slurry pumping pipe 1.

[0010] Further, the mechanical rotating device 2 further includes an inner sleeve 7 and a middle sleeve 8. The inner sleeve 7 and the middle sleeve 8 are used to adapt to different specifications of the fixed column 6. When the shaft diameter of the fixed column 6 is relatively small, it can be realized by sequentially fixedly sleeving the inner sleeve 7 and the middle sleeve 8 from the inside to the outside between the fixed column 6 and the outer sleeve 9.

[0011] Further, the scour pit mold 3 includes a vertical retaining wall 16 and a conical bottom shell 17. The vertical retaining wall 16 is sleeved and fixed outside the lower end of the fixed column 6. The fixed column 6 penetrates to the bottom end of the conical bottom shell 17, and the conical bottom shell 17 forms a funnel-shaped space with a closed bottom. The plane where the circumferential edge of the conical bottom shell 17 is located is flush with the upper surface of the sand tank 5.

[0012] Compared with the prior art, the test-scale flow-state solidified soil circumferential pouring test device developed in the present invention simulates the pumping and pouring process of actual flow-state solidified soil; the whole device is modularly designed, easy to install quickly, convenient for maintenance and repair, and has a low usage cost; the multi-sleeve design and the scouring pit mold design are adapted to different pile diameters and scouring pit sizes, and the design of the grid rotating arm is suitable for underwater environments, with a wide range of application scenarios; by adjusting the relative position between the pump slurry pipe orifice and the pile column, the retention effect of the flow-state solidified soil after pouring can be studied when the pump slurry pipe orifice is at different heights in water and at different radii from the center of the pile column. By adjusting the number of pump slurry pipes, the influence of different pouring methods such as single-point pouring and circumferential pouring around the pile column on the retention effect of the flow-state solidified soil can be studied. By adjusting the power of the pumping machine, the influence of the pouring speed of the solidified soil on the retention effect of the flow-state solidified soil can be studied, providing a device idea for exploring the retention law of the solidified soil under complex flow fields and the influence of various factors to guide engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a schematic diagram of the overall structure of the flow-state solidified soil circumferential pouring test device for pile foundation scour repair;

[0014] Figure 2 FIG. is a schematic diagram of the structure of the mechanical rotating device in the flow-state solidified soil circumferential pouring test device for pile foundation scour repair;

[0015] Figure 3 FIG. is a schematic diagram of the scouring pit mold in the flow-state solidified soil circumferential pouring test device for pile foundation scour repair, where (a) is a three-dimensional view and (b) is a front view;

[0016] In the figure: 1. Pump slurry pipe; 2. Mechanical rotating device; 3. Scouring pit mold; 4. Slurry delivery pipe and slurry pump; 5. Sand trough; 6. Fixed column; 7. Inner sleeve; 8. Middle sleeve; 9. Outer sleeve; 10. Outer extension arm; 11. Bearing; 12. Rotating main ring; 13. Knurled screw; 14. Grid rotating arm; 15. Double V-shaped clamping mouth; 16. Vertical retaining wall; 17. Conical bottom shell; 18. Slurry delivery hose; 19. Slurry delivery hard pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Embodiment: Please refer to Figures 1 to 3A fluidized solidified soil surrounding pouring test device for pile foundation scour repair includes a fixed column 6 (preferably a hollow organic glass column), a sand trough 5, a pit mold 3, a mechanical rotating device 2, a slurry pumping pipe 1, a slurry delivery hose 18, a slurry delivery hard pipe 19, and a slurry pumping machine 4. The bottom of the fixed column 6 is vertically fixed in the sand trough 5, and its top extends above the sand trough 5; the vertical protective wall 16 of the pit mold 3 is covered outside the fixed column 6, and the plane where the outer edge of the truncated cone bottom shell 17 is located is flush with the upper surface of the sand trough 1; the mechanical rotating device 2 is fixed to the top of the fixed column 6, and it clamps and drives the slurry pumping pipe 1 to rotate in a circle and swing in a radial direction; the top pipe opening of the slurry pumping pipe 1 is connected to the slurry delivery hose 18, the slurry delivery hard pipe 19 and the slurry pumping machine 4, and its bottom extends between the pit mold 3 and the mechanical rotating device 2. The mechanical rotating device 2 comprises an inner sleeve 7, a middle sleeve 8, an outer sleeve 9, an outrigger arm 10, a bearing 11, a rotating main ring 12, a knurled screw 13, a lattice rotating arm 14, and a double V-shaped clamp 15; the inner sleeve 7, the middle sleeve 8, and the outer sleeve 9 are fixedly sleeved on the top of the fixed column 6 from the inside to the outside, and are fixed to each other by screws, wherein the top of the outer sleeve 9 is fixedly connected to the middle sleeve 8 by screws; the outer sleeve 9 is sleeved with a bearing 11 on the outside, the outer ring of the bearing 11 is fixed to the top and bottom of the rotating main ring 12 by screws, and the inner ring of the bearing 11 is fixedly sleeved on the outer sleeve 9; the rotating main ring 12 is fixedly connected to the outrigger arm 10 by screws, and a knurled screw 1 is arranged in the middle of the rotating main ring 12 for easy loosening and tightening 3. Tightening the knurled screw 13 can fix the rotating main ring 12, and loosening the knurled screw can control the rotation of the fixed rotating main ring 12, thereby controlling the fixation and rotation of the outrigger 10; the vertical end of the outrigger 10 is connected to the checkered rotating arm 14 by a screw, and the end of the checkered rotating arm 14 is connected to the double V-shaped clamp 15 by a screw. When the checkered rotating arm 14 is moved, the double V-shaped clamp 15 can be driven to swing radially along the fixed column 6; the double V-shaped clamp 15 is connected by screws to clamp and compress the pump slurry pipe 1; the flushing pit mold 3 includes a vertical guard wall 16 and a truncated cone-shaped bottom shell 17; the lower opening of the truncated cone-shaped bottom shell 17 is fixedly connected to the bottom of the vertical guard wall 16, forming a flushing pit simulation structure that is easy to install and use.

[0019] Combined with the attached drawings, the usage method of the present invention is as follows: Set the sand tank 5 in an empty water tank in the laboratory and install the fixing column 6, keeping the fixing column 6 perpendicular to the upper surface of the sand tank 5. Then install the pitting die 3, keeping the horizontal plane where the outer edge of the pitting die 3 is located flush with the upper surface of the sand tank 5. Then install the mechanical rotating device 2 on the top of the fixing column 6, and then install the slurry pumping pipe 1. Adjust the distances from the center of the bottom of the slurry pumping pipe 1 to the outer surface of the fixing column 6 and to the upper surface of the sand tank 5 respectively, and lock the slurry pumping pipe 1. Finally, sleeved the slurry feeding hose 18, the slurry feeding rigid pipe 19 and the slurry pump 4 on the top of the slurry pumping pipe 1 in sequence. When it is necessary to change the diameter of the pile foundation, remove or install the sleeves 7 and 8; in the case of circumferential pouring, during the time interval between two pourings, loosen the knurled screw 13, move the outrigger 10, adjust the position of the slurry pumping pipe 1, and then tighten the knurled screw 13 to continue pouring in the next working condition; when it is necessary to measure the residual fluidized solidified soil during the pouring process, remove the mechanical rotating device 2 and the pitting die 3 in sequence, and weigh the fluidized solidified soil in the pitting die 3.

[0020] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A flow-state solidified soil surrounding pouring test device for pile foundation scour repair, characterized in that, It includes a fixed column (6), a sand groove (5), a punching pit mold (3), a mechanical rotating device (2), a slurry pumping pipe (1), a slurry feeding flexible pipe (18), a slurry feeding rigid pipe (19), and a slurry pump (4); The bottom of the fixed column (6) is vertically fixed in the sand groove (5), and the punching pit mold (3) is sleeved outside the lower end. The punching pit mold (3) is used for pouring slurry to provide a containing space; and the plane where the outer edge of the punching pit mold (3) is located is flush with the upper surface of the sand groove (5); the mechanical rotating device (2) is arranged at the top of the fixed column (6) and can clamp and drive the slurry pumping pipe (1) to rotate circumferentially and swing radially; the top pipe orifice of the slurry pumping pipe (1) is externally connected to the slurry feeding flexible pipe (18), the slurry feeding rigid pipe (19) and the slurry pump (4) in sequence, and the bottom extends between the punching pit mold (3) and the mechanical rotating device (2).

2. The flow-state solidified soil surrounding pouring test device for pile foundation scour repair according to claim 1, characterized in that, The described mechanical rotating device (2) includes an outer sleeve (9), an outer extension arm (10), a bearing (11), a rotating main ring (12), a knurled screw (13), a rotating arm with squares (14), and a double V-shaped clamp (15); The outer sleeve (9) is fixedly sleeved outside the fixed column (6). The inner ring of the bearing (11) is fixed to the outer sleeve (9), and the outer ring is fixed to the rotating main ring (12); a knurled screw (13) is arranged in the area between the outer sleeve (9) and the rotating main ring (12) where there is no bearing (11). The knurled screw (13) passes through the rotating main ring (12) from the outside to the inside. By tightening the knurled screw (13), its inner end abuts against the outer wall of the outer sleeve (9) to realize the fixation of the outer sleeve (9) and the rotating main ring (12); the outer extension arms (10) are fixedly arranged circumferentially and uniformly on the rotating main ring (12); the vertical end of the outer extension arm (10) is rotatably connected to the rotating arm with squares (14), and the positioning between the outer extension arm (10) and the rotating arm with squares (14) is realized by tightening the screw; a double V-shaped clamp (15) is arranged at the end of the rotating arm with squares (14), and the double V-shaped clamp (15) is used for clamping and pressing the slurry pumping pipe (1).

3. The flow-state solidified soil surrounding pouring test device for pile foundation scour repair according to claim 1, wherein, The described mechanical rotating device (2) further includes an inner sleeve (7) and a middle sleeve (8); the inner sleeve (7) and the middle sleeve (8) are used to adapt to fixed columns (6) of different specifications. When the shaft diameter of the fixed column (6) is relatively small, it can be realized by fixedly sleeving the inner sleeve (7) and the middle sleeve (8) on the fixed column (6) and the outer sleeve (9) in sequence from the inside to the outside.

4. The fluid-state solidified soil surrounding pouring test device for pile foundation scour repair according to claim 1, wherein, The punching pit mold (3) includes a vertical retaining wall (16) and a conical bottom shell (17); the vertical retaining wall (16) is sleeved and fixed outside the lower end of the fixed column (6). The fixed column (6) penetrates to the bottom end of the conical bottom shell (17), and the conical bottom shell (17) forms a funnel-shaped space with a closed bottom; the plane where the circumferential edge of the conical bottom shell (17) is located is flush with the upper surface of the sand groove (5).

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