Anti-blocking structure for foundation pit dewatering

Abstract

The utility model relates to the technical field of foundation pit dewatering, specifically relates to a kind of anti-blocking structure for foundation pit dewatering, including double-layer reinforcement cage assembly and filter component, the double-layer reinforcement cage assembly includes outer layer reinforcement cage and the inner layer reinforcement cage being set at the axis of outer layer reinforcement cage, the filter component includes three layers of screen, first layer screen is twisted wire screen, second layer screen is dense mesh, third layer screen is punched screen, the punched screen and the double-layer reinforcement cage cage body are filled with graded gravel filter material. The utility model solves the problem that water pump is blocked by silt and impurities during operation, and has a wider range of application.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit dewatering technology, and more specifically to an anti-siltation structure for foundation pit dewatering. Background Technology

[0002] Modern cities are filled with high-rise buildings, and most new urban construction is high-rise. As the scale of urban underground space development expands, the depth and area of ​​foundation pit excavation will increase significantly. Foundation pit dewatering plays a crucial role in building construction, and its core function is to effectively control the water level in the foundation pit to ensure the smooth progress of construction activities.

[0003] Currently, most construction sites use water pumps to extract water from dewatering wells for dewatering. However, existing dewatering well pumps are prone to clogging by silt and impurities during operation, leading to decreased efficiency or even pump damage, which seriously affects the dewatering effect and increases maintenance costs. Utility Model Content

[0004] In response to the shortcomings of existing technologies, the inventors have developed an anti-siltation structure for foundation pit dewatering through long-term practice, which solves the problem of water pumps being blocked by mud and impurities during operation.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A structure for preventing siltation during foundation pit dewatering includes a double-layer steel cage assembly and a filter assembly.

[0007] The double-layer steel cage assembly includes an outer steel cage and an inner steel cage that runs through the axis of the outer steel cage.

[0008] The filter assembly includes three layers of filter screens: the first layer is a wound wire filter screen, the second layer is a dense mesh filter screen, and the third layer is a perforated filter screen.

[0009] The outer layer of the reinforcing cage is wrapped with the dense mesh, and the outer periphery of the dense mesh is wrapped with the wire mesh. The inner layer of the reinforcing cage is provided with the perforated mesh at its axial center.

[0010] The space between the perforated filter screen and the double-layer steel cage is filled with graded gravel filter material, which consists of a lower coarse gravel layer and an upper fine gravel layer.

[0011] Furthermore, both the outer and inner reinforcing cages are cylindrical and are welded together using φ8-12mm reinforcing bars.

[0012] Furthermore, the longitudinal main reinforcement bars of the outer steel cage are spaced at 150mm, and the transverse stirrups are spaced at 200mm.

[0013] Furthermore, the mesh size of the close-mesh net is no greater than 1mm, and the close-mesh net is tied and fixed to the outer steel cage by stainless steel cable ties.

[0014] Furthermore, the wire-wound filter screen is made of stainless steel and is wound around the outer periphery of the dense mesh.

[0015] Furthermore, the perforated filter screen is made of stainless steel, and the pore size of the perforated filter screen is 1.5±0.5mm.

[0016] Furthermore, the coarse gravel layer consists of coarse gravel that is 50 mm thick and has a particle size of 10-20 mm.

[0017] Furthermore, the fine gravel layer is composed of fine gravel with a particle size of 5-10 mm, and the fine gravel layer fills to 100 mm below the top of the double-layer steel cage.

[0018] The beneficial effects of this utility model are:

[0019] The anti-clogging structure of this utility model uses a multi-stage filter screen combined with graded gravel, which can effectively isolate mud, sand and impurities in the water, improve the performance of the dewatering well pump, reduce the probability of equipment damage due to pump blockage, and thus reduce maintenance costs. Moreover, this utility model has a simple structure, is easy to process on the construction site, and can be flexibly deployed on site after processing, making it more widely applicable. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the double-layer steel cage structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the outer steel cage structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the inner steel reinforcement cage structure of this utility model.

[0024] Figure 5 This is a cross-sectional schematic diagram of the internal structure of this utility model.

[0025] Figure 6 This is a schematic diagram of the structure of the perforated filter screen of this utility model.

[0026] Figure 7 This is a schematic cross-sectional view of the structure of this utility model after being filled with graded gravel.

[0027] In the attached image:

[0028] 1-Outer reinforcing cage, 2-Inner reinforcing cage, 3-Dense mesh, 4-Wire-wound filter mesh, 5-Perforated filter mesh, 6-Coarse gravel layer, 7-Fine gravel layer. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the scope of this utility model.

[0030] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0031] See Figures 1-7 This utility model discloses an anti-siltation structure for foundation pit dewatering, comprising a double-layer steel cage assembly and a filter assembly. The double-layer steel cage assembly includes an outer steel cage 1 and an inner steel cage 2 that penetrates and is disposed at the axis of the outer steel cage 1.

[0032] In this embodiment, both the outer reinforcing cage 1 and the inner reinforcing cage 2 are cylindrical and are welded together using φ8-12mm steel bars. The longitudinal main reinforcement bars of the outer reinforcing cage 1 are spaced at 150mm intervals, and the transverse stirrups are spaced at 200mm intervals.

[0033] The double-layer steel cage welding joints adopt a full welding process. After welding, the weld slag is removed and anti-rust paint is applied. The double-layer steel cage body is prefabricated in 1.5m standard sections, which are connected on site using threaded sleeves. The joints are wrapped with hemp fiber and coated with epoxy resin to achieve sealing.

[0034] The filter assembly includes three layers of filter screens: the first layer is a wound wire filter screen 4, the second layer is a fine mesh filter screen 3, and the third layer is a perforated filter screen 5.

[0035] The outer reinforcing cage 1 is wrapped with a high-density mesh 3, the mesh size of which is no larger than 1mm. The mesh 3 is tied and fixed to the outer reinforcing cage 1 with stainless steel cable ties.

[0036] A fine-mesh mesh 3 is surrounded by a wire-wound filter mesh 4. The wire-wound filter mesh 4 is made of stainless steel and is wound around the outer perimeter of the fine-mesh mesh 3. The combination of the fine-mesh mesh 3 and the wire-wound filter mesh 4 effectively prevents sand and gravel from entering the double-layer steel cage assembly.

[0037] A perforated filter screen 5 is installed at the center of the inner reinforcing cage 2. The perforated filter screen 5 is made of 304 stainless steel, and the aperture of the perforated filter screen 5 is 1.5±0.5mm. During pumping, the inlet of the submersible pump of the dewatering well is placed inside the perforated filter screen 5 for pumping operations.

[0038] Graded gravel filter material is filled between the perforated filter screen 5 and the double-layer reinforced cage. The graded gravel filter material consists of a lower coarse gravel layer 6 and an upper fine gravel layer 7. The coarse gravel layer 6 is composed of 50mm thick coarse gravel with a particle size of 10-20mm. The fine gravel layer 7 is composed of fine gravel with a particle size of 5-10mm, and is filled to 100mm below the top of the double-layer reinforced cage. After the graded gravel filter material is filled, geotextile is covered on top of the reinforced cage to prevent backflow of fine particles. In this embodiment, the porosity of the graded gravel filter material is 35%-40%, which can establish stable seepage channels and enhance the pumping stability of the submersible pump.

[0039] This invention employs a quadruple filtration mechanism consisting of a wound wire mesh filter, a fine mesh filter, a perforated filter, and graded gravel, which can effectively intercept suspended particles with a diameter greater than 0.5 mm.

[0040] When using the anti-clogging structure of this utility model, first place the double-layer steel cage assembly, which is wrapped with dense mesh 3 and wire mesh 4, into the dewatering well. Then, place the perforated filter 5 into the core of the inner steel cage 2 and fill it with graded gravel filter material. After the gravel is filled, place the water inlet of the dewatering well submersible pump into the perforated filter 5 for pumping. Since the submersible pump is placed in the core area of ​​the filtration system, the risk of submersible pump impeller wear and water inlet pipe blockage can be significantly reduced.

[0041] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A structure for preventing siltation during foundation pit dewatering, characterized in that, Includes a double-layer steel cage assembly and a filter assembly; The double-layer steel cage assembly includes an outer steel cage (1) and an inner steel cage (2) that runs through the center of the outer steel cage (1). The filter assembly includes three layers of filter screens: the first layer is a wound wire filter screen (4), the second layer is a fine mesh filter screen (3), and the third layer is a perforated filter screen (5). The outer layer of the steel cage (1) is wrapped with the dense mesh (3), the outer periphery of the dense mesh (3) is wrapped with the wire mesh (4), and the inner layer of the steel cage (2) is provided with the perforated mesh (5). The perforated filter screen (5) and the double-layer steel cage are filled with graded gravel filter material, which consists of a lower coarse gravel layer (6) and an upper fine gravel layer (7).

2. The anti-siltation structure for foundation pit dewatering according to claim 1, characterized in that, Both the outer steel cage (1) and the inner steel cage (2) are cylindrical and are welded together using φ8-12mm steel bars.

3. The anti-siltation structure for foundation pit dewatering according to claim 1, characterized in that, The longitudinal main reinforcement spacing of the outer steel cage (1) is 150mm and the transverse stirrup spacing is 200mm.

4. The anti-siltation structure for foundation pit dewatering according to claim 1, characterized in that, The mesh size of the mesh (3) is no greater than 1 mm, and the mesh (3) is tied and fixed to the outer steel cage (1) by stainless steel cable ties.

5. The anti-siltation structure for foundation pit dewatering according to claim 1, characterized in that, The wire mesh filter (4) is made of stainless steel and is wound around the outer periphery of the dense mesh (3).

6. The anti-siltation structure for foundation pit dewatering according to claim 1, characterized in that, The perforated filter screen (5) is made of 304 stainless steel and the pore size of the perforated filter screen (5) is 1.5±0.5mm.

7. The anti-siltation structure for foundation pit dewatering according to claim 1, characterized in that, The coarse gravel layer (6) consists of coarse gravel with a thickness of 50 mm and a particle size of 10-20 mm.

8. The anti-siltation structure for foundation pit dewatering according to claim 7, characterized in that, The fine gravel layer (7) is composed of fine gravel with a particle size of 5-10 mm, and the fine gravel layer (7) is filled to 100 mm below the top of the double-layer steel cage.

Images