Foundation pit drainage device

Abstract

The utility model discloses a kind of foundation pit drainage devices, including foundation pit on foundation, and anti-seep retaining wall on the four around of foundation pit, the anti-seep retaining wall includes multiple steel sheet piles, each the steel sheet pile is sequentially spliced and enclosed in the four around of foundation pit to form anti-seep retaining wall, the top of the anti-seep retaining wall is stretched to above foundation pit, the inside of the top of the anti-seep retaining wall is equipped with inner bracing frame, outside is equipped with outer bracing frame, drainage mechanism that can float on water body is equipped in the anti-seep retaining wall. This foundation pit drainage device is simple in structure, high in construction efficiency and small in construction difficulty, convenient to disassemble and assemble, and it is convenient to reuse and reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit dewatering technology, and in particular to a foundation pit dewatering device. Background Technology

[0002] In water conservancy projects or comprehensive river regulation projects, foundation pit dewatering is a complex geotechnical engineering problem involving hydrogeology, structural safety, and other fields. It requires high technical expertise and is highly systematic. The foundation pits used in these projects are characterized by deep excavations, large scale, and complex geology, making dewatering extremely difficult. The choice of dewatering method directly affects the quality and effectiveness of the project and involves multiple aspects such as safety, economy, construction period, and environmental protection. Currently, foundation pit dewatering mainly employs two methods: open drainage and artificial dewatering. Artificial dewatering is further divided into lightweight wellpoint dewatering and tubular wellpoint dewatering, based on factors such as permeability coefficient, dewatering depth, foundation pit size, and sensitivity to the surrounding environment. These methods each have unique application conditions and limitations: the open drainage method is simple to construct, low in cost, and fast in construction, but it is only suitable for shallow dewatering, especially in silt or gravel strata, where it is difficult to control the groundwater level and is prone to soil erosion and quicksand; light well points and tubular well points are used for deep dewatering, but light well points require vacuum suction, are greatly affected by the system's sealing performance, and have a high failure rate, while tubular well points have high drilling and well completion costs, and deep well pumps and drainage pipelines require large construction space, which limits their versatility due to site requirements, and improper well sealing after dewatering may become a channel for groundwater pollution.

[0003] Chinese patent application number 202110405676.9 discloses an integrated drainage system for a pumping station foundation pit. A ring of cement-soil cutoff walls is constructed at intervals along the outer edge of the foundation pit, forming a closed cutoff wall. The cement-soil cutoff wall penetrates the permeable layer and extends to a depth of 2 meters below the relatively impermeable layer. Outside the foundation pit, within the closed space formed by the cement-soil cutoff wall, a ring of external pressure-reducing wells is constructed, with the bottom elevation of the pressure-reducing wells located at the bottom elevation of the permeable layer. An internal drainage well is constructed inside the foundation pit, with its bottom elevation also located at the bottom elevation of the permeable layer. The integrated drainage system for the pumping station foundation pit, consisting of the cement-soil cutoff wall, the external pressure-reducing wells, and the internal drainage wells, utilizes the cement-soil cutoff wall to form a closed cutoff wall, lowers the groundwater level inside the foundation pit to below 0.5 meters of the design base level through the drainage wells, and maintains the water head difference between the inside and outside of the foundation pit within a 7-meter range through the pressure-reducing wells. The integrated drainage system for the pumping station pit requires the pouring of concrete outside the pit to form a closed cutoff wall, which not only results in long construction time and inconvenient disassembly and assembly, but also makes it difficult to reuse and is costly.

[0004] A Chinese patent application with application number 202311758843.3 discloses a drainage construction method for deep foundation pits in soft soil geology, including the following steps: S1: completing the foundation pit support pile work; S2: setting up drainage ditches; S3: excavating the soft soil layer; S4: laying a gravel layer on the bottom of the foundation pit; S5: pre-burying the main drainage pipe and branch drainage pipes in the gravel layer; S6: setting up sump pits at the four corners of the gravel layer, pre-burying the main drainage pipes around the perimeter of the gravel layer, connecting the main drainage pipes to the main drainage pipes nearby, connecting the main drainage pipes to the sump pits, and setting a slope for the main drainage pipes towards the sump pits; S7: setting up a drainage pump in the sump pits. Water in the soft soil layer will seep into the gravel layer after a certain period of time. The gravel layer is highly permeable, and a sponge-like drainage system, consisting of main and branch drainage pipes, efficiently and systematically discharges the water from the gravel layer into the main drainage pipe. The water then flows into a sump and is finally pumped into an open drainage ditch for drainage. This drainage method requires pre-burying main drainage pipes around the gravel layer, making construction difficult and costly. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a foundation pit dewatering device that is simple in structure, has high construction efficiency and low construction difficulty, is easy to disassemble and assemble, is easy to reuse and reduces costs.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A foundation pit dewatering device includes a foundation pit on the foundation and a seepage-proof retaining wall around the foundation pit. The seepage-proof retaining wall includes multiple steel sheet piles, which are sequentially spliced ​​together to enclose the foundation pit to form a seepage-proof retaining wall. The top of the seepage-proof retaining wall extends above the foundation pit. The top of the seepage-proof retaining wall is provided with an inner support frame on the inner side and an outer support frame on the outer side. The seepage-proof retaining wall is provided with a dewatering mechanism that can float on water.

[0007] As a further improvement to the above technical solution: The opposite sides of the adjacent sheet piles are vertically interlocked.

[0008] Vertical slots and vertical inserts are provided on opposite sides of adjacent sheet piles, with the vertical inserts being vertically inserted into the vertical slots.

[0009] The sheet pile is an inwardly arched block, and an inner groove is formed on the outer side of the sheet pile. The slot is located on the inner wall of the inner groove of the sheet pile.

[0010] The inner support frame and the outer support frame are fixed to the seepage barrier wall by tie bolts, which are inserted into the seepage barrier wall.

[0011] The tie bolt includes a threaded rod, which passes through the inner support frame, the seepage barrier wall, and the outer support frame. Nuts are provided at both ends of the threaded rod, and the nuts at both ends of the threaded rod are respectively pressed onto the inner support frame and the outer support frame.

[0012] The seepage-proof retaining wall is square.

[0013] The pumping and drainage mechanism includes a float, a pump, a hose, and a pumping pipe. The float floats in the water inside the seepage barrier wall. The pump is mounted on the float. The pump's inlet is connected to the water below the float via the pumping pipe, and its outlet is connected to the outside of the seepage barrier wall via the hose.

[0014] The seepage-proof retaining wall is equipped with a vertical guide rod, and the floating body is lifted and mounted on the vertical guide rod.

[0015] The top of the vertical guide rod is fixed to the seepage-proof retaining wall by a fixing rod.

[0016] Compared with the prior art, the advantages of this utility model are: The foundation pit dewatering device of this utility model has two advantages. First, the seepage-proof retaining wall is formed by sequentially splicing steel sheet piles around the foundation pit. The bottom end of each steel sheet pile can be inserted into the bottom of the foundation pit to achieve installation, which has high construction efficiency and short construction time. It is also easy to disassemble and assemble, easy to reuse and has low cost. Second, the drainage mechanism floats with the water body to pump the water from the seepage-proof retaining wall to the outside. The drainage main pipes are pre-embedded around the gravel layer for drainage, which reduces the construction difficulty and reduces the cost. Attached Figure Description

[0017] Figure 1 This is a top view schematic diagram of the foundation pit dewatering device of this utility model.

[0018] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0019] The labels in the diagram represent: 1. Foundation pit; 2. Seepage-proof retaining wall; 21. Steel sheet pile; 211. Slot; 212. Vertical insert; 213. Inner groove; 3. Inner support frame; 4. Outer support frame; 5. Pumping and drainage mechanism; 51. Floating body; 52. Water pump; 53. Hoses; 54. Pumping pipe; 6. Tie bolts; 61. Screws; 62. Nuts; 7. Vertical guide rods; 8. Fixing rods. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Figure 1 and Figure 2 This invention illustrates one embodiment of the foundation pit dewatering device. The foundation pit dewatering device of this embodiment includes a foundation pit 1 located on the foundation and a seepage-proof retaining wall 2 located around the foundation pit 1. The seepage-proof retaining wall 2 includes multiple steel sheet piles 21, which are sequentially spliced ​​together to enclose the foundation pit 1 to form the seepage-proof retaining wall 2. The top of the seepage-proof retaining wall 2 extends above the foundation pit 1. The inner side of the top of the seepage-proof retaining wall 2 is provided with an inner support frame 3, and the outer side is provided with an outer support frame 4. The seepage-proof retaining wall 2 is provided with a pumping and drainage mechanism 5 that can float on water.

[0025] The drainage device for this foundation pit has two advantages. First, the seepage-proof retaining wall 2 is formed by sequentially splicing steel sheet piles 21 around the foundation pit 1. The bottom end of each steel sheet pile 21 can be inserted into the bottom of the foundation pit 1 to achieve installation, which is efficient and time-saving. It is also easy to disassemble and reassemble, and is easy to reuse and cost-effective. Second, the pumping and drainage mechanism 5 floats with the water body and pumps the water from the seepage-proof retaining wall 2 to the outside. The drainage main pipes are pre-embedded around the gravel layer for drainage, which reduces the construction difficulty and costs.

[0026] Furthermore, in this embodiment, the opposite sides of adjacent sheet piles 21 are vertically interlocked. Adjacent sheet piles 21 can achieve interlocking through vertical insertion, which on the one hand facilitates assembly and disassembly, and on the other hand prevents adjacent sheet piles 21 from separating laterally, thereby improving the overall splicing strength.

[0027] Furthermore, such as Figure 2 As shown, in this embodiment, vertical slots 211 and vertical inserts 212 are respectively provided on opposite sides of adjacent sheet piles 21. The vertical inserts 212 are vertically inserted into the vertical slots 211, which has a simple structure and is easy to manufacture. The vertical slots 211 and vertical inserts 212 are shaped to match.

[0028] Furthermore, in this embodiment, the sheet pile 21 is an inwardly arched block (facing the side inside the seepage barrier 2), and an inner groove 213 is formed on the outer side of the sheet pile 21. The slot 211 is provided on the inner wall of the inner groove 213 of the sheet pile 21. Of course, the vertical slot 211 and the vertical insert 212 can also engage in other positions, as long as it can prevent adjacent sheet piles 21 from separating laterally and allow adjacent sheet piles 21 to be vertically disassembled and joined.

[0029] Furthermore, in this embodiment, the inner support frame 3 and the outer support frame 4 are fixed to the seepage barrier wall 2 by tie bolts 6, which pass through the seepage barrier wall 2. The top of the seepage barrier wall 2 is clamped and fixed by the inner support frame 3 and the outer support frame 4, improving the overall stability and strength. Moreover, the inner support frame 3 and the outer support frame 4 are conveniently assembled and disassembled by the tie bolts 6.

[0030] Furthermore, in this embodiment, the tie bolt 6 includes a screw 61, which passes through the inner support frame 3, the seepage barrier wall 2, and the outer support frame 4. Nuts 62 are provided at both ends of the screw 61, and the nuts 62 at both ends of the screw 61 are respectively pressed onto the inner support frame 3 and the outer support frame 4.

[0031] Furthermore, in this embodiment, the seepage barrier 2 is square. Of course, in other embodiments, the seepage barrier 2 can also be configured in other practically required shapes besides square.

[0032] Further, in this embodiment, the pumping and drainage mechanism 5 includes a float 51, a water pump 52, a hose 53, and a suction pipe 54. The float 51 floats in the water within the seepage barrier wall 2. The water pump 52 is mounted on the float 51. The inlet of the water pump 52 is connected to the water below the float 51 via the suction pipe 54, and the outlet is connected to the outside of the seepage barrier wall 2 via the hose 53. The water pump 52 floats with the float 51 in the water within the seepage barrier wall 2, draws water through the suction pipe 54, and discharges water to the outside of the seepage barrier wall 2 through the hose 53. Preferably, the water pump 52 is a conventional commercially available component. A filter screen can be installed at the inlet end of the suction pipe 54 to prevent impurities from entering the water pump 52 and damaging it. Further, a valve can be installed on the hose 53.

[0033] Furthermore, in this embodiment, a vertical guide rod 7 is provided inside the seepage barrier wall 2, and the float 51 is lifted and sleeved on the vertical guide rod 7. The float 51 floats and rises with the water along the vertical guide rod 7, improving stability.

[0034] Furthermore, in this embodiment, the top of the vertical guide rod 7 is fixed to the seepage barrier wall 2 by a fixing rod 8 to improve stability. Preferably, one end of the fixing rod 8 is fixedly connected to the top of the vertical guide rod 7 (e.g., by welding), and the other end is connected to the seepage barrier wall 2 by a fixing bolt, which facilitates assembly and disassembly. The bottom of the vertical guide rod 7 can be inserted into the bottom of the foundation pit 1.

[0035] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A foundation pit dewatering device, comprising a foundation pit (1) situated on the foundation and a seepage-proof retaining wall (2) surrounding the foundation pit (1), characterized in that: The seepage-proof retaining wall (2) includes multiple steel sheet piles (21), and each steel sheet pile (21) is sequentially spliced ​​to surround the foundation pit (1) to form a seepage-proof retaining wall (2). The top of the seepage-proof retaining wall (2) extends above the foundation pit (1). The top of the seepage-proof retaining wall (2) is provided with an inner support frame (3) on the inner side and an outer support frame (4) on the outer side. The seepage-proof retaining wall (2) is provided with a pumping and drainage mechanism (5) that can float on the water.

2. The foundation pit dewatering device according to claim 1, characterized in that: The opposite sides of the adjacent sheet piles (21) are vertically interlocked.

3. The foundation pit dewatering device according to claim 2, characterized in that: Vertical slots (211) and vertical inserts (212) are provided on opposite sides of adjacent sheet piles (21), and the vertical inserts (212) are vertically inserted into the vertical slots (211).

4. The foundation pit dewatering device according to claim 3, characterized in that: The sheet pile (21) is an inner arch block that bulges inward. An inner groove (213) is formed on the outer side of the sheet pile (21). The slot (211) is located on the inner wall of the inner groove (213) of the sheet pile (21).

5. The foundation pit dewatering device according to claim 1, characterized in that: The inner support frame (3) and the outer support frame (4) are fixed to the seepage barrier wall (2) by tie bolts (6), which are inserted into the seepage barrier wall (2).

6. The foundation pit dewatering device according to claim 5, characterized in that: The tie bolt (6) includes a screw (61), which is inserted into the inner support frame (3), the seepage barrier wall (2) and the outer support frame (4). Nuts (62) are provided at both ends of the screw (61), and the nuts (62) at both ends of the screw (61) are pressed onto the inner support frame (3) and the outer support frame (4) respectively.

7. The foundation pit dewatering device according to claim 1, characterized in that: The seepage-proof retaining wall (2) is square.

8. The foundation pit dewatering device according to any one of claims 1 to 7, characterized in that: The pumping and drainage mechanism (5) includes a float (51), a pump (52), a hose (53), and a pumping pipe (54). The float (51) floats in the water inside the seepage barrier wall (2). The pump (52) is located on the float (51). The inlet of the pump (52) is connected to the water under the float (51) through the pumping pipe (54), and the outlet is connected to the outside of the seepage barrier wall (2) through the hose (53).

9. The foundation pit dewatering device according to claim 8, characterized in that: The seepage-proof retaining wall (2) is provided with a vertical guide rod (7), and the float (51) is lifted and sleeved on the vertical guide rod (7).

10. The foundation pit dewatering device according to claim 9, characterized in that: The top of the vertical guide rod (7) is fixed to the seepage barrier wall (2) by a fixing rod (8).

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