Earth excavation dewatering device for deep foundation pit in sandy soil geology

Abstract

The utility model provides a sandy soil geology deep foundation pit earth excavation dewatering device. The sandy soil geology deep foundation pit earth excavation dewatering device comprises a fixing cover. The fixing cover is in threaded connection with the side wall of the top end of the supporting structure; the precipitation structure is mounted in the protection pipe; the fixing block is in threaded connection with the bottom surface of the bottom plate; one end of the geotechnical cloth is fixed between the limiting block and the bottom plate; the net column is supported on the inner side wall of the protection pipe; the notches are vertically formed in the side walls of the net columns, and the height of the notches is equal to that of the net columns. The sandy soil geology deep foundation pit earthwork excavation dewatering device has the advantage of being capable of preventing soil and gravel from entering the drainage pit during drainage.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit dewatering, in particular to a dewatering device for earthwork excavation of deep foundation pits in sandy soil. Background Technique

[0002] Deep foundation pit dewatering refers to the work of dewatering when excavating a deep foundation pit. When the groundwater level is higher than the bottom surface of the deep foundation pit, groundwater continuously seeps into the pit. To ensure the construction of the deep foundation pit under dry conditions and prevent slope instability, foundation quicksand, bottom heave, bottom piping, and a decrease in foundation bearing capacity, dewatering work is carried out.

[0003] During the construction process of civil engineering, situations where the groundwater level is relatively high are often encountered. Generally, the measure taken is to excavate a sump at a corner of the foundation pit and arrange a water pump for drainage. However, during the dewatering process, groundwater and infiltrated water continuously flow into the sump, and impurities such as soil and sand are continuously carried into the sump during the inflow process. When the soil and sand enter the water pump, they continuously wear the internal parts of the water pump, thereby reducing the service life of the water pump.

[0004] Therefore, it is necessary to provide a new dewatering device for earthwork excavation of deep foundation pits in sandy soil to solve the above technical problems. Content of the Utility Model

[0005] To solve the above technical problems, the utility model provides a dewatering device for earthwork excavation of deep foundation pits in sandy soil, which is convenient for preventing soil and sand from entering the drainage pit during drainage.

[0006] The dewatering device for earthwork excavation of deep foundation pits in sandy soil provided by the utility model includes: a fixed cover; a support structure, the fixed cover is threadedly connected to the top side wall of the support structure, the support structure includes a protective pipe, through holes, and a limiting block, the fixed cover is threadedly connected to the top side wall of the protective pipe, the through holes are evenly distributed on the side wall of the protective pipe, and the limiting block is fixed to the inner side wall at the bottom end of the protective pipe; a dewatering structure, the dewatering structure is installed inside the protective pipe, the dewatering structure includes an outer cover, leakage holes, a bottom plate, a water pump, and a conduit, the outer cover is installed inside the protective pipe, the leakage holes are evenly distributed on the side wall at the upper end of the outer cover, the bottom plate is threadedly connected to the ground of the outer cover, the water pump is fixed at the center position on the surface of the bottom plate, and one end of the conduit is connected to the top end of the water pump; a fixing block, the fixing block is threadedly connected to the bottom surface of the bottom plate; a geotextile, one end of the geotextile is fixed between the limiting block and the bottom plate; a net column, the net column supports the inner side wall of the protective pipe; a notch, the notch is vertically arranged on the side wall of the net column, and the height of the notch is equal to the height of the net column.

[0007] Preferably, the precipitation structure further includes a base platform, a bump, and a percolation hole. The base platform is fixed to the bottom end of the outer cover. The bump is fixed to the center position of the bottom surface of the bottom plate. The percolation hole is provided in the ground of the bottom plate.

[0008] Preferably, the base platform is cylindrical in shape, and the diameter of the base platform is slightly smaller than the inner diameter of the protective pipe. The base platform slides on the inner side wall of the protective pipe. The protective pipe extends into the inside of the foundation pit of the foundation, and the top end of the protective pipe is higher than the surface of the foundation pit of the foundation.

[0009] Preferably, the limiting block is circular ring-shaped, and the inner diameter of the limiting block is smaller than the diameter of the base platform. The bottom surface of the base platform abuts against the surface of the limiting block.

[0010] Preferably, the outer cover is conical in shape, and its height corresponds to the length of the water pump. The water pump is installed inside the outer cover through the bottom plate, and the bottom plate rotates through the bump.

[0011] Preferably, the bottom end of the geotextile is fixed to the bottom surface of the bump through the fixing block. The contact surfaces of the fixing block and the bump are staggered with protrusions. The side wall of the geotextile is in close contact with the inner side wall of the protective pipe. The mesh column supports the inner side wall of the geotextile, and the top end of the geotextile is fixed through the fixing cover.

[0012] Preferably, the distance between the maximum diameter of the outer cover and the inner side wall of the protective pipe is slightly larger than the thickness of the mesh column. The bottom end of the mesh column covers the periphery of the outer cover, and the mesh column supports the geotextile to abut against the inner side wall of the protective pipe.

[0013] Compared with the related art, the deep foundation pit earthwork excavation and precipitation device for sandy soil provided by the present utility model has the following beneficial effects:

[0014] The utility model provides a dewatering device for earthwork excavation in deep foundation pits with sandy soil. First, the water pump is fixed inside the outer cover, which can protect the water pump and prevent it from shaking randomly when it is inside the support structure. The opposite sides of the geotextile are fixedly closed and made into a circular tube shape, which can make it more conveniently fit on the inner side wall of the protection structure. The dewatering structure is placed inside the bottom end of the circular tube-shaped geotextile. Through the threaded connection between the fixing block and the bottom surface of the dewatering structure, the bottom end of the geotextile can be fixed on the bottom surface of the dewatering structure, so that the geotextile wraps the dewatering structure. Then, the wrapped dewatering structure is put into the support structure from the top end and slides to the bottom end of the support structure. The bottom end of the geotextile is clamped between the limit block and the dewatering structure. Then, the geotextile is arranged to make it in a hollow shape and fit on the inner side wall of the support structure. Then, the net column is inserted into the support structure from the top end and expands outward under the guiding and supporting of the dewatering structure, so that it supports the geotextile to closely adhere to the side wall of the support structure. The geotextile blocks the through holes arranged on the side wall of the support structure under the support of the net column. Then, the fixed cover is threadedly connected to the top end of the support structure to fix the positions of the net column and the geotextile. Then, the support structure is put into the drainage pit in the foundation pit of the foundation. The support structure can support the drainage pit to prevent it from collapsing. The water entering through the through holes will be filtered by the geotextile, so that the sediment mixed in the water is isolated outside and prevented from entering the inside of the support structure. This device has the advantage of being convenient to prevent soil and sand from entering the drainage pit during drainage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic structural diagram of a preferred embodiment of the dewatering device for earthwork excavation in deep foundation pits with sandy soil provided by the utility model;

[0016] Figure 2 FIG. Figure 1 2 is a schematic structural diagram of a top view section of the support structure shown in FIG. 1;

[0017] Figure 3 FIG. Figure 1 3 is a schematic three-dimensional display structural diagram of the dewatering structure shown in FIG. 1;

[0018] Figure 4 FIG. Figure 3 4 is a schematic inverted display structural diagram of the dewatering structure shown in FIG. 1;

[0019] Figure 5 FIG. Figure 1 5 is a schematic enlarged structural diagram of part A shown in FIG. 1;

[0020] Figure 6 FIG.Figure 2 Schematic structural diagram of the enlarged part B shown

[0021] Figure 7 is Figure 5 Schematic structural diagram of the enlarged part C shown

[0022] Reference numerals in the figure: 1, fixed cover; 2, support structure; 21, protective pipe; 22, through hole; 23, limit block; 3, fixed block; 4, dewatering structure; 41, outer cover; 42, leakage hole; 43, bottom plate; 44, water pump; 45, conduit; 46, base; 47, convex block; 48, seepage hole; 5, geotextile; 6, net column; 7, foundation pit foundation; 8, notch Specific implementation mode

[0023] The present utility model will be further described below in conjunction with the accompanying drawings and implementation modes

[0024] Please refer to Figure 1 , Figure 2 and Figure 3 wherein Figure 1 is the schematic structural diagram of a preferred embodiment of the deep foundation pit earthwork excavation and dewatering device for sandy soil provided by the present utility model Figure 2 is Figure 1 Schematic structural diagram of the top view section of the support structure shown Figure 3 is Figure 1 Schematic three-dimensional display structural diagram of the dewatering structure shown Figure 4 is Figure 3 Schematic inverted display structural diagram of the dewatering structure shown Figure 5 is Figure 1 Schematic structural diagram of the enlarged part A shown Figure 6 is Figure 2 Schematic structural diagram of the enlarged part B shown Figure 7 is Figure 5Schematic diagram of the enlarged structure of part C shown. The dewatering device for earthwork excavation in deep foundation pits with sandy soil geology includes: a fixed cover 1; a support structure 2, the fixed cover 1 is threadedly connected to the top side wall of the support structure 2, the support structure 2 includes a protective pipe 21, through holes 22 and a limiting block 23, the fixed cover 1 is threadedly connected to the top side wall of the protective pipe 21, the through holes 22 are evenly distributed on the side wall of the protective pipe 21, and the limiting block 23 is fixed to the inner side wall at the bottom end of the protective pipe 21; a dewatering structure 4, the dewatering structure 4 is installed inside the protective pipe 21, the dewatering structure 4 includes an outer cover 41, leakage holes 42, a bottom plate 43, a water pump 44 and a conduit 45, the outer cover 41 is installed inside the protective pipe 21, the leakage holes 42 are evenly distributed on the side wall at the upper end of the outer cover 41, the bottom plate 43 is threadedly connected to the ground surface of the outer cover 41, the water pump 44 is fixed at the center position on the surface of the bottom plate 43, and one end of the conduit 45 is connected to the top end of the water pump 44; a fixing block 3, the fixing block 3 is threadedly connected to the bottom surface of the bottom plate 43; a geotextile 5, one end of the geotextile 5 is fixed between the limiting block 23 and the bottom plate 43; a mesh column 6, the mesh column 6 supports the inner side wall of the protective pipe 21; a notch 8, the notch 8 is vertically arranged on the side wall of the mesh column 6, and the height of the notch 8 is equal to the height of the mesh column 6.

[0025] In the specific implementation process, as Figure 1 , Figure 3 , Figure 4 and Figure 5 shown, the dewatering structure 4 further includes a base 46, a convex block 47 and seepage holes 48, the base 46 is fixed to the bottom end of the outer cover 41, the convex block 47 is fixed to the center position on the bottom surface of the bottom plate 43, and the seepage holes 48 are arranged on the ground surface of the bottom plate 43; the shape of the base 46 is cylindrical, and the diameter of the base 46 is slightly smaller than the inner diameter of the protective pipe 21, and the base 46 slides on the inner side wall of the protective pipe 21, the protective pipe 21 penetrates into the internal part of the foundation pit foundation 7, and the top end of the protective pipe 21 is higher than the surface of the foundation pit foundation 7; the shape of the limiting block 23 is circular ring-shaped, and the inner diameter of the limiting block 23 is smaller than the diameter of the base 46, and the bottom surface of the base 46 abuts against the surface of the limiting block 23; the shape of the outer cover 41 is conical, and its height corresponds to the length of the water pump 44, and the water pump 44 is installed inside the outer cover 41 through the bottom plate 43, and the bottom plate 43 rotates through the convex block 47.

[0026] It is convenient to penetrate deep into the foundation pit foundation 7 through the protection pipe 21 to support the drainage pit. Then, it is convenient to slide the base 46 inside the protection pipe 21 to limit the position of the outer cover 41 so that it is always at the central position inside the protection pipe 21. Moreover, the limit block 23 can limit the position of the base 46, restricting the position of the base 46 to the inner side wall at the bottom end of the support pipe. And through the threaded connection between the bottom plate 43 and the base 46, the water pump 44 can be fixed inside the outer cover 41, thereby fixing the position of the water pump 44.

[0027] During the specific implementation process, as Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 and Figure 7 shown, the bottom end of the geotextile 5 is fixed to the bottom surface of the convex block 47 through the fixing block 3. And the contact surface between the fixing block 3 and the convex block 47 is staggered with protrusions. The side wall of the geotextile 5 is in contact with the inner side wall of the protection pipe 21. The mesh column 6 supports the inner side wall of the geotextile 5, and the top end of the geotextile 5 is fixed through the fixing cover 1. The distance between the maximum diameter of the outer cover 41 and the inner side wall of the protection pipe 21 is slightly larger than the thickness of the mesh column 6. And the bottom end of the mesh column 6 covers the periphery of the outer cover 41. And there is provided on the side wall of one end of the mesh column. And the mesh column 6 supports the geotextile 5 to abut against the inner side wall of the protection pipe 21.

[0028] It is convenient to clamp and fix the geotextile 5 through the threaded connection between the fixing block 3 and the bottom plate 43, so that the geotextile 5 can wrap the outer cover 41 to protect the outer cover 41. Under the support of the mesh column 6, the geotextile 5 is clamped between the inner side wall of the protection pipe 21. Through the threaded connection between the fixing cover 1 and the protection pipe 21, the top end of the geotextile 5 can be clamped and fixed.

[0029] The working principle of the sand geological deep foundation pit earthwork excavation and dewatering device provided by the present utility model is as follows:

[0030] During use, first, a drainage pit is dug downward at a position with a relatively low level of the foundation pit foundation 7, so that the water in the foundation pit foundation 7 flows into the drainage pit. Then, the water pump 44 is placed through the bottom port of the outer cover 41, with one end abutted against the bottom surface inside the top end of the outer cover 41. The bottom plate 43 is rotated through the bump 47, so that the bottom plate 43 is threadedly connected to the bottom end of the outer cover 41, and the water pump 44 is fixed inside the outer cover 41. Then, the conduit 45 is connected to the top end of the water pump 44 through the opening at the top end of the outer cover 41. Next, the geotextile 5 is connected end to end to form a tubular shape. Then, the drain pipe penetrates through the inside of the tubular geotextile 5 from the bottom end, and the outer cover 41 is placed at the bottom end inside the tubular geotextile 5. Then, its bottom opening is sewn and closed, and a circular hole is opened at the center position of its bottom end. The diameter of the circular hole is smaller than the maximum diameter of the fixing block 3. The fixing block 3 penetrates through the circular hole and is threadedly connected to the bottom plate 43. The bottom end of the geotextile 5 is clamped and fixed on the bottom surface of the bottom plate 43 through the protrusions provided on its surface. Then, the wrapped outer cover 41 is placed into the top end of the protection pipe 21, so that the outer cover 41 is supported by the base 46 and slides inside the protection pipe 21 until the bottom surface of the base 46 abuts against the surface of the limit block 23. Then, the top opening of the tubular geotextile 5 is turned outwards to cover the side wall at the top end of the protection pipe 21. The geotextile 5 is arranged so that it is in a hollow shape and fits closely on the inner side wall of the protection pipe 21. Then, the net column 6 is inserted through the opening at the upper end of the geotextile 5, so that the drain pipe is located at the center position inside the protection pipe 21 and extends into the protection pipe 21. When it reaches the bottom end, it will be sleeved on the periphery of the outer cover 41. Along the tapered side wall of the outer cover 41, the net column 6 will be gradually expanded outwards until the bottom end of the net column 6 abuts against the surface of the base 46, positioning the position of the base 46 on the limit block 23. Supported by the outer cover 41, the net column 6 will squeeze the geotextile 5 to closely adhere to the inner side wall of the protection pipe 21. Then, the fixing cover 1 is threadedly connected to the top end of the protection pipe 21, so that the fixing cover 1 squeezes and fixes the position of the net column 6 inside the protection pipe 21. At the same time, the top end of the geotextile 5 is squeezed and fixed, so that the geotextile 5 is supported on the inner side wall of the protection pipe 21 and will not easily wrinkle. Then, the protection pipe 21 is placed into the drainage pit, and the protection pipe 21 is supported on the inner side wall of the drainage pit, with the top end of the protection pipe 21 higher than the height of the drainage pit, thereby preventing sediment from falling into its interior from the top end of the protection pipe 21. Then, the water accumulated in the drainage pit will first infiltrate in through the through holes 22 and the infiltration holes 48 provided on the side wall of the protection pipe 21. Under the isolation of the geotextile 5, impurities such as sediment in the water are filtered out.Then, the water pump 44 is used to pump the water filtered by the geotextile 5 and discharge it outward through the drain pipe. This device has the advantage of preventing soil and sand from entering the drainage pit during drainage.

[0031] Compared with the related technology, the sand soil deep foundation pit earth excavation and dewatering device provided by the present utility model has the following beneficial effects:

[0032] The present utility model provides a sand soil deep foundation pit earth excavation and dewatering device. First, the water pump 44 is fixed inside the outer cover 41, which can protect the water pump 44 and prevent the water pump 44 from shaking randomly when it is inside the support structure 2. And the opposite sides of the geotextile 5 are fixedly closed and made into a circular tube shape, which can make it more conveniently fit on the inner side wall of the protection structure. The dewatering structure 4 is placed inside the bottom end of the circular tube-shaped geotextile 5. Through the threaded connection between the fixing block 3 and the bottom surface of the dewatering structure 4, the bottom end of the geotextile 5 can be fixed on the bottom surface of the dewatering structure 4, so that the geotextile 5 wraps the dewatering structure 4. Then, the wrapped dewatering structure 4 is placed into the support structure 2 from the top end and slides to the bottom end of the support structure 2. The bottom end of the geotextile 5 is clamped between the limit block 23 and the dewatering structure 4. Then, the geotextile 5 is arranged to be in a hollow shape and fit on the inner side wall of the support structure 2. Then, the net column 6 is inserted into the support structure 2 from the top end and expands outward under the guiding and supporting of the dewatering structure 4, so that it supports the geotextile 5 to closely adhere to the side wall of the support structure 2. The geotextile 5 blocks the through holes 22 arranged on the side wall of the support structure 2 under the support of the net column 6. Then, the fixing cover 1 is threadedly connected to the top end of the support structure 2 to fix the positions of the net column 6 and the geotextile 5. Then, the support structure 2 is placed into the drainage pit in the foundation pit foundation 7. The support structure 2 can support the drainage pit to prevent collapse. The water entering through the through holes 22 will be filtered by the geotextile 5, so that the sediment mixed in the water is isolated outside to prevent the sediment from entering the inside of the support structure 2. This device has the advantage of preventing soil and sand from entering the drainage pit during drainage.

[0033] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A dewatering device for earthwork excavation in deep foundation pits in sandy soil, characterized in that, Comprising: Fixed cover (1); Support structure (2), the fixed cover (1) is threadedly connected to the top side wall of the support structure (2), the support structure (2) includes a protective tube (21), through holes (22) and a limiting block (23), the fixed cover (1) is threadedly connected to the top side wall of the protective tube (21), the through holes (22) are evenly distributed on the side wall of the protective tube (21), and the limiting block (23) is fixed to the inner side wall at the bottom end of the protective tube (21); Precipitation structure (4), the precipitation structure (4) is installed inside the protective tube (21), the precipitation structure (4) includes an outer cover (41), leakage holes (42), a bottom plate (43), a water pump (44) and a conduit (45), the outer cover (41) is installed inside the protective tube (21), the leakage holes (42) are evenly distributed on the side wall at the upper end of the outer cover (41), the bottom plate (43) is threadedly connected to the ground of the outer cover (41), the water pump (44) is fixed at the center position on the surface of the bottom plate (43), and one end of the conduit (45) is connected to the top end of the water pump (44); Fixed block (3), the fixed block (3) is threadedly connected to the bottom surface of the bottom plate (43); Geotextile (5), one end of the geotextile (5) is fixed between the limiting block (23) and the bottom plate (43); Net column (6), the net column (6) is supported on the inner side wall of the protective tube (21); Notch (8), the notch (8) is vertically arranged on the side wall of the net column (6), and the height of the notch (8) is equal to the height of the net column (6).

2. The dewatering device for earthwork excavation of deep foundation pits in sandy soil according to claim 1, characterized in that, The precipitation structure (4) further includes a base (46), a convex block (47) and a seepage hole (48), the base (46) is fixed to the bottom end of the outer cover (41), the convex block (47) is fixed to the center position on the bottom surface of the bottom plate (43), and the seepage hole (48) is arranged on the ground of the bottom plate (43).

3. The dewatering device for earthwork excavation of deep foundation pits in sandy soil according to claim 2, characterized in that, The base (46) is in a cylindrical shape, and the diameter of the base (46) is slightly smaller than the inner diameter of the protective tube (21), and the base (46) slides on the inner side wall of the protective tube (21), and the protective tube (21) penetrates into the inside of the foundation pit foundation (7), and the top end of the protective tube (21) is higher than the surface of the foundation pit foundation (7).

4. The dewatering device for earthwork excavation of deep foundation pits in sandy soil according to claim 2, characterized in that, The limiting block (23) is in a circular ring shape, and the inner diameter of the limiting block (23) is smaller than the diameter of the base (46), and the bottom surface of the base (46) abuts against the surface of the limiting block (23).

5. The dewatering device for earthwork excavation of deep foundation pits in sandy soil according to claim 2, characterized in that, The outer cover (41) is in a conical shape, and its height corresponds to the length of the water pump (44), and the water pump (44) is installed inside the outer cover (41) through the bottom plate (43), and the bottom plate (43) rotates through the convex block (47).

6. The dewatering device for earthwork excavation of deep foundation pits in sandy soil according to claim 2, characterized in that, The bottom end of the geotextile (5) is fixed to the bottom surface of the convex block (47) through the fixing block (3), and the contact surface between the fixing block (3) and the convex block (47) is staggered with protrusions, and the side wall of the geotextile (5) is in close contact with the inner side wall of the protective pipe (21), the net column (6) supports the inner side wall of the geotextile (5), and the top end of the geotextile (5) is fixed through the fixing cover (1).

7. The dewatering device for earthwork excavation of deep foundation pits in sandy soil according to claim 1, characterized in that, The distance between the maximum diameter of the outer cover (41) and the inner side wall of the protective pipe (21) is slightly larger than the thickness of the net column (6), and the bottom end of the net column (6) covers the periphery of the outer cover (41), and the net column (6) supports the geotextile (5) to abut against the inner side wall of the protective pipe (21).

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