Row pile supporting foundation pit side wall water burst prevention structure and construction method

Abstract

The invention relates to a row pile supporting foundation pit side wall water burst prevention structure and a construction method, the row pile supporting foundation pit side wall water burst prevention structure comprises a plurality of supporting units which are sequentially arranged in the longitudinal direction of row piles, and each supporting unit comprises a supporting steel plate, a supporting steel bar, a steel bar net, an embedded steel bar, a concrete layer and a water drainage pipe; supporting steel plates and supporting steel bars are arranged between every two adjacent row piles, and the number of the supporting steel plates is at least two. The two ends of the supporting steel bars are anchored into the row piles, and the supporting steel bars are fixedly connected with the supporting steel plates; a reinforcing mesh is arranged among the row piles, embedded steel bars are arranged in the row piles, one ends of the embedded steel bars are fixedly connected with the reinforcing mesh, and concrete is sprayed on the reinforcing mesh to form a concrete layer. A water drain pipe is arranged on the concrete layer, one end of the water drain pipe extends inwards, and the other end of the water drain pipe penetrates out of the concrete layer outwards. The method can solve the problem that the underground water level of soft strata such as sand layers and sandy soil affects the excavation progress of the open excavation station, and meanwhile the construction risk of excavation of the deep foundation pit is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit support, and in particular to a water gushing prevention structure for a foundation pit side wall supported by a row of piles and a construction method. Background Art

[0002] Pit support can adopt the row pile support structure, which is one of the most commonly used engineering measures to maintain the stability of the foundation pit. The row pile is a foundation pit support structure composed of a certain type of pile arranged in a queue. The row pile can be a bored or excavated cast-in-place pile and a prefabricated sheet pile or steel sheet pile. For the construction of underground station foundation pits using the row pile support, once the groundwater level is high, this will seriously restrict the construction progress, because the seepage of the foundation pit is an important factor threatening the stability and safety of the foundation pit, and there is a risk of groundwater outside the pit leaking into the pit.

[0003] In order to prevent water seepage in the foundation pit, the traditional construction method of underground stations is to drill precipitation wells to reduce groundwater or combine precipitation wells with collection pits. Drainage operations are first carried out, and then the slope support of the foundation pit excavation adopts the construction method of hanging mesh spraying to ensure the stability of the slope and play a water-stopping effect during the foundation pit excavation process, avoiding the occurrence of water seepage in the foundation pit.

[0004] For stable strata such as clay, it is feasible to use the above construction methods to lower the groundwater level. However, for soft strata such as sand layers and sandy soil, the above methods alone are not effective in lowering the groundwater level and improving the slope support, and delay the construction period while increasing the construction risk. The reason is that once the groundwater level in the soft strata is high, it is easy to cause soil and water loss on the side walls of the foundation pit, and the effect of the mesh shotcrete will be greatly reduced due to the influence of water seepage, so that the shotcrete is difficult to form on the surface of the side walls of the foundation pit. Therefore, for soft soil layers such as sand layers and sandy soil, in order to ensure the construction progress, timely reducing groundwater and reducing the risk of deep foundation pit excavation construction are the primary issues to be solved in the construction of open-cut stations. Summary of the invention

[0005] In order to solve the problem that the construction measures of conventional water collection wells combined with hanging net spraying are not suitable for foundation pit support in soft strata, the present invention provides a water gushing prevention structure for supporting the side walls of the foundation pit with piles and a construction method. By arranging the water gushing prevention structure between the piles, on the one hand, the loss of sand and soil on the side walls of the foundation pit can be avoided, and on the other hand, the seepage water can be discharged in time, thereby reducing the risk of instability and collapse of the foundation pit.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: The anti-water gushing structure of the side wall of the foundation pit supported by a row of piles includes a plurality of groups of supporting units arranged in sequence along the longitudinal direction of the row of piles, each group of supporting units includes a supporting steel plate, supporting steel bars for limiting the supporting steel plate, a steel mesh, embedded steel bars and a concrete layer, and a drainage pipe; The support steel plate and the support steel bar are arranged between two adjacent rows of piles. The number of the support steel plates is at least two arranged in parallel on the left and right. The two adjacent support steel plates are interlocked and connected, which improves the tightness of the joint. The support steel plates of the upper and lower adjacent groups of support units are overlapped; the number of the support steel bars is multiple and arranged at intervals in the upper and lower parts. Both ends of the support steel bars are anchored into the row of piles. The support steel bars and the support steel plates are connected and fixed, which is convenient for reinforcing the support steel plates; The steel mesh is arranged between the multiple rows of piles, and embedded steel bars are arranged in the rows of piles. One end of the embedded steel bars is connected and fixed to the steel mesh, so that the steel mesh is closely arranged between the multiple rows of piles. Concrete is sprayed on the steel mesh to form the concrete layer, and the concrete layer covers the supporting steel plate and the supporting steel bars, thereby improving the integrity of the structure; The drain pipe is arranged on the concrete layer, and the number of the drain pipe is at least one. One end of the drain pipe passes through the supporting steel bars and the supporting steel plates in sequence and extends inward, and the other end of the drain pipe passes out of the concrete layer, so as to timely discharge the water flow in the sand layer and lower the groundwater level.

[0007] Furthermore, the supporting steel plate extends downward along the longitudinal direction of the row of piles. The supporting steel plate is a type of channel steel or U-shaped interlocking steel sheet pile. The arrangement directions of two adjacent supporting steel plates are opposite. After multiple parallel supporting steel plates are connected and combined, the space between two adjacent rows of piles is closed, effectively preventing the loss of sand and soil on the side wall of the foundation pit.

[0008] Furthermore, the distance A between the supporting steel plate and the outer wall of the pile body is less than the radius of the pile row; there is an external insertion angle B between each supporting steel plate and the pile body, and the external insertion angle B is not greater than 3°; the lap length of the supporting steel plates in the two adjacent groups of supporting units is not less than 500mm.

[0009] Furthermore, each of the supporting steel bars is arranged between multiple parallel supporting steel plates, and can support multiple supporting steel plates. The supporting steel bars and supporting steel plates are welded and fixed. The length of the supporting steel bars is less than the center distance between two adjacent rows of piles, and the anchoring length C of the end of the supporting steel bars is ≥100mm.

[0010] Furthermore, the number of embedded steel bars in each of the row of piles is a plurality of steel bars arranged at intervals in the upper and lower parts, one end of the embedded steel bar extends out of the row of piles and is welded and fixed to the steel mesh, and the steel mesh is tightly against the outer wall of the row of piles; The thickness of the concrete layer is at least 100 mm. The concrete layer, supporting steel bars and supporting steel plates are arranged in sequence along the radial direction of the pile row. A mortar leveling layer is also provided on the surface of the concrete layer.

[0011] Furthermore, the drain pipe is arranged between two adjacent rows of piles, the length of the drain pipe is greater than the radius of the pile row, the drain pipe is cast in the concrete layer, one end of the drain pipe is welded and fixed to the supporting steel plate, and the end of the drain pipe extending inward is a hollow structure and is provided with a filter cartridge.

[0012] The construction method of the anti-water gushing structure of the side wall of the foundation pit supported by a row of piles is based on the above-mentioned anti-water gushing structure of the side wall of the foundation pit supported by a row of piles, and comprises the following steps: Step 1: Arrange a corresponding number of support units according to the excavation depth; Step 2, construction of the first group of support units: first, remove the soil between the piles at the excavation platform, and use equipment to insert multiple support steel plates arranged in parallel downward between two adjacent rows of piles according to the designed angle; arrange multiple support steel bars up and down between two adjacent rows of piles, and weld the support steel bars to the support steel plates to complete the reinforcement of the support steel plates; excavate the current layer of earthwork, set up drainage pipes according to the on-site seepage conditions, and weld the drainage pipes and support steel plates to fix them; hang steel mesh between multiple rows of piles and spray concrete to form a concrete layer; Step 3, construction of the next group of support units: after the construction of the previous group of support units is completed and the concrete layer is solidified, the lower layer of earth is excavated; repeat step 2, continue the construction of the next group of support units, and the support steel plates in the next group of support units and the previous group of support units are overlapped up and down; repeat this process until the construction of the corresponding number of support units is completed.

[0013] Through the above technical solution, the beneficial effects of the present invention are: The structural design of the present invention is reasonable. A support unit is arranged at the water gushing part of the sand layer of the foundation pit wall, and the support unit relies on the pile row near the pit wall. The existing pile row can play a good stabilizing support role. A plurality of support steel plates are arranged between two adjacent pile rows. The support steel plates are used to conveniently block the sand layer between the piles, which has the function of supporting the foundation pit. At the same time, support steel bars are arranged between the piles, and the ends of the support steel bars are anchored to the pile rows. At the same time, the support steel bars and the support steel plates are welded and fixed. In this way, it is convenient to reinforce the support steel plates, ensure the reliability of the arrangement of the support steel plates, improve the integrity and stability of the support unit, prevent the loss of sand and soil on the side walls of the foundation pit, and reduce the risk of instability and collapse of the foundation pit.

[0014] The steel mesh of the present invention is arranged on the side wall of the foundation pit using pre-buried steel bars, and a concrete layer is formed after concrete is sprayed on the steel mesh, thereby protecting the side wall of the foundation pit and ensuring the safety of the side wall of the foundation pit. During the construction of the support unit, a drainage pipe can be arranged between the piles according to the seepage conditions of the side wall of the foundation pit. The drainage pipe runs through the concrete layer, the supporting steel bars and the supporting steel plate, and the water flow in the sand layer can be discharged, effectively reducing the groundwater and preventing the groundwater level from decreasing slowly. The present invention is suitable for the excavation construction of underground station foundation pits with high groundwater levels and unstable geological conditions such as sand layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the water-gushing prevention structure of the side wall of the foundation pit supported by a row of piles according to the present invention, in which the supporting steel plate is a channel steel structure.

[0016] Figure 2 It is a top view of the anti-water gushing structure of the side wall of the foundation pit supported by a row of piles according to the present invention, in which the supporting steel plate is a U-shaped interlocking steel sheet pile structure.

[0017] Figure 3 It is a schematic diagram of the disassembled state of the drainage pipe and the filter cartridge of the anti-water gushing structure of the side wall of the foundation pit supported by the pile row of the present invention.

[0018] Figure 4 It is a side view of the water-gushing prevention structure of the side wall of the foundation pit supported by a row of piles according to the present invention.

[0019] Figure 5 The invention is a water-proof structure for supporting the side wall of a foundation pit with a row of piles. Figure 4 Enlarged schematic diagram at point a in the middle.

[0020] Figure 6 The invention is a water-proof structure for supporting the side wall of a foundation pit with a row of piles. Figure 4 Enlarged schematic diagram at point b in the middle.

[0021] The numbers in the attached figure are: 1 row of piles, 2 supporting steel plates, 3 supporting steel bars, 4 steel mesh, 5 embedded steel bars, 6 concrete layer, 7 drainage pipe, 8 stabilizing plate, 9 water holes, 10 filter cartridge, 11 support ring. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings: like Figure 1 to Figure 6 As shown, the anti-water gushing structure of the side wall of the foundation pit supported by a row of piles includes multiple groups of support units arranged in sequence along the longitudinal direction of the row of piles 1. Multiple groups of support units are constructed in sequence from top to bottom, and the number of support units is determined according to the excavation depth of the foundation pit. The row of piles 1 combined with multiple groups of support units can solve the sand and soil loss on the side wall of the foundation pit caused by high groundwater level and slow lowering of groundwater level, and reduce the risk of instability and collapse of the foundation pit.

[0023] Each support unit includes a support steel plate 2, a support steel bar 3 for limiting the support steel plate 2, a steel mesh 4, an embedded steel bar 5, a concrete layer 6, and a drain pipe 7. A support steel plate 2 is arranged between two adjacent rows of piles 1, and the support steel plate 2 extends longitudinally downward along the row of piles 1. The support steel plate 2 is a channel steel or a U-shaped interlocking steel sheet pile.

[0024] There are at least two supporting steel plates 2 between two adjacent rows of piles 1, and at least two supporting steel plates 2 are arranged side by side. Here, there are three supporting steel plates 2, each of which is 2000 mm long. The arrangement directions of two adjacent supporting steel plates 2 are opposite, and the two adjacent supporting steel plates 2 are interlocked. After the three parallel supporting steel plates 2 are connected and combined, the space between two adjacent rows of piles 1 is closed.

[0025] During the construction of the support steel plate 2, the distance A between the support steel plate 2 and the outer wall of the pile body of the pile row 1 is less than the radius of the pile row 1. There is an external insertion angle B between each support steel plate 2 and the pile body of the pile row 1, and the external insertion angle B is not greater than 3°. The support steel plates 2 of the upper and lower adjacent support units are overlapped, and the overlap length of the support steel plates 2 in the upper and lower adjacent support units is not less than 500mm.

[0026] Supporting steel bars 3 are also arranged between two adjacent rows of piles 1. The length of the supporting steel bars 3 is less than the center distance between the two adjacent rows of piles 1. The length of the supporting steel bars 3 is 1200mm. The number of supporting steel bars 3 is multiple and arranged at intervals from top to bottom. The specification of the supporting steel bars 3 is HRB400 and the diameter is 25mm. Each supporting steel bar 3 is arranged between multiple parallel supporting steel plates 2, so that each supporting steel plate 2 can be supported by the supporting steel bars 3. Both ends of the supporting steel bars 3 are anchored into the row of piles 1, and the anchoring length C of the ends of the supporting steel bars 3 is ≥100mm. The supporting steel bars 3 and the supporting steel plates 2 are connected and fixed, and the supporting steel bars 3 and the supporting steel plates 2 are welded and fixed.

[0027] Pre-buried steel bars 5 are arranged in the piles 1. The number of pre-buried steel bars 5 in each pile 1 is multiple and arranged in intervals. Steel meshes 4 are arranged between the piles 1. The specifications of the steel meshes 4 are Φ8@150×150mm. One end of the embedded steel bar 5 is connected and fixed to the steel mesh 4, that is, one end of the embedded steel bar 5 extends out of the pile row 1 and is welded and fixed to the steel mesh 4, so that the steel mesh 4 is tightly against the outer wall of the pile body of the pile row 1. C25 concrete is sprayed on the steel mesh 4 to form a concrete layer 6, and the thickness of the concrete layer 6 is at least 100mm. The concrete layer 6 covers the supporting steel plate 2 and the supporting steel bar 3. The concrete layer 6, the supporting steel bar 3 and the supporting steel plate 2 are arranged in sequence along the radial direction of the pile row 1, and a mortar leveling layer 12 is also provided on the surface of the concrete layer 6.

[0028] A drain pipe 7 is provided on the concrete layer 6, that is, the drain pipe 7 is cast in the concrete layer 6. The drain pipe 7 is arranged between two adjacent rows of piles 1, the number of the drain pipe 7 is at least one, the length of the drain pipe 7 is greater than the radius of the row of piles 1, one end of the drain pipe 7 passes through the supporting steel bars 3 and the supporting steel plate 2 in sequence and extends inward, and the other end of the drain pipe 7 passes outward from the concrete layer 6. When the drain pipe 7 is installed, one end of the drain pipe 7 is welded and fixed to the supporting steel plate 2, and the end of the drain pipe 7 extending inward is a hollow structure and is provided with a filter cartridge 10.

[0029] Specifically, the drain pipe 7 is a pipe body with a diameter of 50 mm. The end of the drain pipe 7 extending inward is closed, and the end extending outward is open. A stabilizing plate 8 with reinforcing ribs is arranged on the outer wall of the drain pipe 7. The stabilizing plate 8 and the supporting steel plate 2 are welded and fixed. The stabilizing plate 8 is used to increase the contact area between the drain pipe 7 and the supporting steel plate 2, thereby improving the reliability of the installation of the drain pipe 7. A plurality of water holes 9 are evenly opened in an annular direction on the outer wall of the inner end of the drain pipe 7. The water holes 9 are long holes, which can increase the drainage range. A filter cartridge 10 is sleeved in the drain pipe 7. The filter cartridge 10 is a circular ring made of a filter screen. The filter cartridge 10 does not close the water hole 9, and the sand layer is prevented from entering the drain pipe 7 through the filter cartridge 10. A plurality of hollow support rings 11 are arranged at intervals in the filter cartridge 10, which can support the filter cartridge 10 to prevent its deformation without affecting the flow of water.

[0030] The present invention arranges support steel plates 2 between piles, and the support steel plates 2 can block the sand layer between piles and prevent sand and soil loss. Support steel bars 3 are also arranged between piles, and the support steel bars 3 are anchored to the pile row 1. The support steel plates 2 can be reinforced by the support steel bars 3, which effectively blocks the sand and soil between piles. At the same time, there are steel meshes 4 between piles, and the steel meshes 4 are sprayed with concrete to form a concrete layer 6, thereby effectively reinforcing the foundation pit wall. A drainage pipe 7 can also be installed at the water gushing position to divert the gushing water in the sand layer to the outside, timely reduce groundwater, and reduce the construction risk of soft strata.

[0031] The construction method of the anti-water gushing structure of the side wall of the foundation pit supported by a row of piles comprises the following steps: Step 1: Arrange the corresponding number of support units according to the excavation depth. Here, four groups of support units are arranged. On the basis of hanging mesh and spraying between piles in row 1, the construction of support units is carried out. The construction position of support units is at the location where water gushes from the sand layer of the foundation pit wall. During construction, the piles with no water flow or less water flow are constructed first.

[0032] Step 2, construction of the first group of support units: first remove the soil between the piles at the excavation platform, and use excavator equipment to insert three 2000mm long support steel plates 2 arranged in parallel downwards between two adjacent row piles 1 according to the designed angle. The starting position of the insertion is 182mm inward from the outer wall of the pile body of the row pile 1, and the external insertion angle is limited to no more than 3°. When inserting, insert the support steel plates 2 on both sides first, and then insert the support steel plate 2 in the middle.

[0033] Two HRB400 support steel bars 3 with a length of 1200 mm and a diameter of 25 mm are arranged between two adjacent rows of piles 1. The distance between two adjacent support steel bars 3 is 1000 mm, and the end of each support steel bar 3 is anchored in the row of piles 1. The support steel bars 3 are welded and fixed to the support steel plate 2 to complete the reinforcement of the support steel plate 2.

[0034] When excavating the current earthwork, set up drainage pipes 7 according to the seepage of the foundation pit wall on site. Drainage pipes 7 are used in the parts with large seepage. Drainage pipes 7 and supporting steel plates 2 are welded and fixed. The vertical spacing between the two adjacent drainage pipes 7 is 1000mm to ensure that the drainage pipes 7 can divert the gushing water in the sand layer outside the foundation pit. For the parts with small seepage, geotextiles can be used in combination with quick leak plugging king for treatment.

[0035] A Φ8@150×150 mm steel mesh 4 is hung between the plurality of piles 1, the steel mesh 4 is welded and fixed to the embedded steel bars 5, and concrete is sprayed on the steel mesh 4 to form a 100 mm thick C25 concrete layer 6. A drain pipe 7 passes through the concrete layer 6.

[0036] Step 3, construction of the next group of support units: after the construction of the previous group of support units is completed and the concrete layer 6 is solidified, the lower earthwork is excavated, the earthwork excavation depth is 1500mm, and the excavation width is 1 pile spacing. Repeat step 2, continue the construction of the next group of support units, the support steel plates 2 in the next group of support units and the previous group of support units are overlapped up and down, and the overlap length is not less than 500mm; repeat this process until the construction of the corresponding number of support units is completed.

[0037] While the support unit is being constructed, four drainage wells are arranged outside the foundation pit, with a depth of 40m. A 7.5kw water pump is arranged in each well for pumping water. Three drainage wells are arranged inside the foundation pit, with a depth of 20m. A 5.5Kw water pump is arranged in each well for pumping water. The diameter of the drainage well is 800mm, and the hole is drilled by a rotary drilling rig. Sandless concrete filter pipes are used below the static water level, and concrete solid pipes are used above the static water level, with an inner diameter of 500mm and a wall thickness of 50mm.

[0038] The construction method of the present invention adds a dewatering well to pump out water at the same time on the basis of the construction of the support unit. Compared with the traditional support method, this construction method has the effect of stabilizing the soil layer, reducing the loss of sand and soil on the pit wall, and reducing the risk of foundation pit excavation construction. At the same time, it can also accelerate the speed of groundwater decline and ensure the construction period of the foundation pit.

[0039] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. The anti-water-gushing structure of the side wall of the foundation pit supported by a row of piles is characterized by: It comprises a plurality of groups of support units arranged in sequence along the longitudinal direction of the pile row (1), each group of support units comprising a support steel plate (2), support steel bars (3) for limiting the support steel plate (2), a steel mesh (4), pre-buried steel bars (5) and a concrete layer (6), and a drainage pipe (7); The supporting steel plate (2) and the supporting steel bar (3) are arranged between two adjacent rows of piles (1); the number of the supporting steel plates (2) is at least two arranged side by side on the left and right; the two adjacent supporting steel plates (2) are interlocked and connected; the supporting steel plates (2) of two adjacent groups of supporting units are overlapped; the number of the supporting steel bars (3) is a plurality of supporting steel bars arranged at intervals in the upper and lower parts; both ends of the supporting steel bars (3) are anchored into the row of piles (1); and the supporting steel bars (3) and the supporting steel plates (2) are connected and fixed; The steel mesh (4) is arranged between the plurality of row piles (1), embedded steel bars (5) are arranged in the row piles (1), one end of the embedded steel bars (5) is connected and fixed to the steel mesh (4), concrete is sprayed on the steel mesh (4) to form the concrete layer (6), and the concrete layer (6) covers the supporting steel plate (2) and the supporting steel bars (3); The drain pipe (7) is arranged on the concrete layer (6), the number of the drain pipe (7) is at least one, one end of the drain pipe (7) passes through the supporting steel bars (3) and the supporting steel plate (2) in sequence and extends inwardly, and the other end of the drain pipe (7) passes out of the concrete layer (6).

2. The anti-water gushing structure for the side wall of the foundation pit supported by a row of piles according to claim 1 is characterized in that: The supporting steel plate (2) extends longitudinally downward along the row of piles (1); the supporting steel plate (2) is a type of channel steel or U-shaped interlocking steel sheet pile; two adjacent supporting steel plates (2) are arranged in opposite directions; and a plurality of parallel supporting steel plates (2) are connected and combined to close the space between two adjacent rows of piles (1).

3. The anti-water gushing structure for the side wall of the foundation pit supported by a row of piles according to claim 2 is characterized in that: The distance A between the supporting steel plate (2) and the outer wall of the pile body of the row of piles (1) is less than the radius of the row of piles (1); there is an external insertion angle B between each supporting steel plate (2) and the pile body of the row of piles (1), and the external insertion angle B is not greater than 3°; and the overlapping length of the supporting steel plates (2) in two adjacent groups of supporting units is not less than 500 mm.

4. The anti-water gushing structure for the side wall of the foundation pit supported by a row of piles according to claim 1 is characterized in that: Each of the supporting steel bars (3) is arranged between a plurality of parallel supporting steel plates (2), the supporting steel bars (3) and the supporting steel plates (2) are welded and fixed, the length of the supporting steel bars (3) is less than the distance between the centers of two adjacent rows of piles (1), and the anchoring length C of the end of the supporting steel bars (3) is ≥100 mm.

5. The anti-water gushing structure for the side wall of the foundation pit supported by a row of piles according to claim 1 is characterized in that: The number of embedded steel bars (5) in each row of piles (1) is a plurality of steel bars arranged at intervals in the upper and lower parts, one end of the embedded steel bars (5) extends out of the row of piles (1) and is welded and fixed to the steel mesh (4), and the steel mesh (4) is tightly pressed against the outer wall of the pile body of the row of piles (1); The thickness of the concrete layer (6) is at least 100 mm. The concrete layer (6), the supporting steel bars (3) and the supporting steel plates (2) are arranged in sequence along the radial direction of the pile row (1). A mortar leveling layer (12) is also provided on the surface of the concrete layer (6).

6. The anti-water gushing structure for the side wall of the foundation pit supported by a row of piles according to claim 1, characterized in that: The drainage pipe (7) is arranged between two adjacent rows of piles (1); the length of the drainage pipe (7) is greater than the radius of the row of piles (1); the drainage pipe (7) is cast in the concrete layer (6); one end of the drainage pipe (7) is welded and fixed to the supporting steel plate (2); and the end of the drainage pipe (7) extending inward is a hollow structure and is provided with a filter cartridge (10).

7. The construction method of the anti-water-gushing structure of the side wall of the foundation pit supported by a row of piles is characterized by: The anti-water gushing structure for the side wall of a foundation pit supported by a row of piles according to any one of claims 1 to 6 comprises the following steps: Step 1: Arrange a corresponding number of support units according to the excavation depth; Step 2, construction of the first group of support units: first, remove the soil between the piles at the excavation platform, use equipment to insert the multiple support steel plates (2) arranged in parallel downwardly between two adjacent rows of piles (1) according to the designed angle; arrange multiple support steel bars (3) between the two adjacent rows of piles (1), and weld the support steel bars (3) to the support steel plates (2) to complete the reinforcement of the support steel plates (2); excavate the current layer of earthwork, set up a drainage pipe (7) according to the on-site seepage situation, and weld the drainage pipe (7) to the support steel plates (2); hang a steel mesh (4) between the multiple rows of piles (1), and spray concrete to form a concrete layer (6); Step 3, construction of the next group of support units: after the construction of the previous group of support units is completed and the concrete layer (6) is solidified, the lower layer of earth is excavated; step 2 is repeated to continue the construction of the next group of support units, and the support steel plates (2) in the next group of support units and the previous group of support units are overlapped up and down; this process is repeated until the construction of the corresponding number of support units is completed.

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