A foundation pit support structure

Abstract

The utility model provides a kind of foundation pit support structure, including several Larsen steel sheet piles, several steel encloses purlin and steel support;All Larsen steel sheet piles are mutually occlusal connection and are enclosed into the rectangular foundation pit enclosure surface of face, and the foundation pit enclosure surface includes the convex surface and several concave surface of several alternate interval settings;All steel encloses purlin are installed in the inside of foundation pit enclosure surface, and all steel encloses purlin are enclosed into the annular structure of rectangle;Steel encloses purlin is fixedly connected with convex surface, and the both ends of steel support are respectively connected on the steel encloses purlin of two sides, and the both ends of steel support are all fixedly connected with Larsen steel sheet pile after being encircled by threaded steel at least one week.The utility model has the advantages that the structure is encircled by threaded steel, restricts the horizontal displacement and rotation of steel support end, avoids steel support to slip, greatly improves the connection stability, avoids the slippage and falling problem that traditional rest type connection is prone to, improves the security and reliability of support system.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit technology, and more specifically, to a foundation pit support structure. Background Technology

[0002] In the existing foundation pit support structure system, the horizontal steel bracing is a key load-bearing component, and its connection strength is directly related to the overall stability and safety of the support system.

[0003] Existing technologies commonly suffer from overly simplistic connection methods between steel supports and steel walers. These typically involve merely using brackets for support or simple fixing to brackets, lacking effective rigid connections or reliable constraint mechanisms. This construction method makes the steel supports prone to displacement, slippage, and even instability under stress, especially in deep foundation pits, soft soil foundations, or engineering environments significantly affected by external vibrations, where the safety hazards are even more pronounced.

[0004] In terms of load transfer efficiency, the lateral load borne by the steel support needs to be transferred through the path of "steel support end → bracket → steel waler → steel sheet pile". However, the "resting" connection causes the load to concentrate at the welded joint between the bracket and the steel waler. Furthermore, the contact surface between the steel support end and the bracket is prone to "point contact" or "local contact" due to construction errors (such as insufficient flatness of the bracket or low cutting accuracy of the steel support end), leading to stress concentration. Under long-term loading, the welded joint of the bracket is prone to fatigue cracking, interrupting the load transfer, which in turn causes local overload of the steel waler, resulting in bending deformation of the steel waler and loss of overall restraint on the steel sheet pile.

[0005] Therefore, there is an urgent need for a new type of connection structure that can significantly improve the connection strength, stiffness and stability between horizontal steel supports and steel walers, in order to meet the higher requirements of foundation pit support systems under complex engineering conditions. Utility Model Content

[0006] The present invention aims to solve the technical problems of insufficient connection strength and easy displacement and instability of steel supports in existing foundation pit support structures. In order to overcome the above-mentioned defects of the prior art, the present invention provides a method of fixing the two ends of the steel support with threaded steel around the steel to enhance the overall connection stability and connection strength of the steel support.

[0007] To achieve the purpose of this utility model, the following technical solution is adopted: A foundation pit support structure includes a plurality of Larssen sheet piles, a plurality of steel walers, and steel supports; all the Larssen sheet piles are interlocked and connected to form a rectangular foundation pit retaining surface, the foundation pit retaining surface including a plurality of alternating convex surfaces and a plurality of concave surfaces; all the steel walers are installed on the inner side of the foundation pit retaining surface, and all the steel walers form a rectangular ring structure; the steel walers are fixedly connected to the convex surfaces, and a casting gap is formed between the steel walers and the concave surfaces; the steel supports are arranged horizontally, and the two ends of the steel supports are respectively connected to the steel walers on both sides, and both ends of the steel supports are fixedly connected to the Larssen sheet piles after being wrapped with threaded steel bars at least once. This structure uses threaded steel to form a circumferential constraint, restricting the horizontal displacement and rotation of the steel support ends, preventing slippage of the steel supports, significantly improving connection stability, avoiding the slippage and detachment problems that are prone to occur in traditional shelving connections, and improving the safety and reliability of the support system. The steel waler is fixed only to the convex surface and leaves a casting gap with the concave surface, which not only ensures a reliable connection between the steel waler and the foundation pit retaining surface, but also reserves space for possible subsequent filling and reinforcement, adapting to the concave-convex structure characteristics of Larssen steel sheet piles. The overall rectangular foundation pit retaining surface, together with the ring-shaped steel waler and transverse steel supports, forms a closed-loop force system, optimizing the load transfer path, reducing local stress concentration, and improving the overall lateral displacement resistance of the support structure.

[0008] Preferably, at least five stiffening ribs are provided at the connection point between the steel waler and the end of the steel support, and all stiffening ribs are arranged at intervals along the extension direction of the steel waler. The stiffening ribs further enhance the support strength and connection stability.

[0009] Preferably, the diameter of the rebar is 15-25mm. A diameter that is too small is prone to breakage under stress, failing to provide effective restraint; a diameter that is too large increases weight and bending difficulty, making it difficult to tightly wrap around the steel support. A diameter of 20mm is preferred, ensuring sufficient tensile strength and gripping force while also considering construction feasibility and economy, ensuring the durability and load-bearing capacity of the connection structure.

[0010] Preferably, the threaded steel bar and the Larssen sheet pile are fixed together by welding. Welding creates a rigid connection without gaps, preventing displacement caused by gaps under load and further strengthening the constraint effect of the threaded steel bar on the steel support.

[0011] Preferably, triangular steel plate supports are welded to the inside corners of the rectangular ring-shaped steel waler. These triangular steel plate supports are fixed to the inside corners by welding, utilizing the "geometric stability" property of triangles; dispersing the concentrated load at the inside corners, converting vertical and horizontal forces into axial forces on the steel plate supports, preventing cracking or bending at the inside corners of the steel waler; enhancing the overall rigidity of the ring-shaped steel waler, ensuring it maintains its rectangular shape under load, preventing local deformation, and ensuring balanced force distribution at both ends of the steel support.

[0012] Preferably, the steel plate bracing consists of two pieces, arranged vertically and alternately; each steel plate bracing has a thickness of 1.5-2.5cm. This vertically and alternately arranged arrangement of the two steel plate bracings forms a "double-layer support," which, compared to a single steel plate bracing, can cover a larger area of ​​the stress zone at the inside corner, further dispersing the load and improving the corner's resistance to deformation. The preferred thickness is 2cm, which meets the support strength requirements while avoiding material waste and construction space occupation caused by excessively thick steel plates, thus balancing "structural strength" and "economy."

[0013] Preferably, the inner side of the foundation pit retaining surface is provided with L-shaped steel plate supports for supporting the steel walers. The vertical plates of the L-shaped steel plate supports are fixedly connected to the convex surfaces, and the horizontal plates of the L-shaped steel plate supports support the steel walers. A support bracket is also fixedly connected between the vertical and horizontal plates of the L-shaped steel plate supports. The two ends of the steel supports rest on the horizontal plates of the L-shaped steel plate supports on both sides. By fixing the vertical plates of the L-shaped steel plate supports to the convex surfaces and supporting the steel walers and steel supports with the horizontal plates, a reliable support point is provided for the steel walers, and the horizontal displacement of the steel walers is restricted by the vertical plates. The support bracket connects the vertical and horizontal plates of the L-shaped steel plate supports to form a triangular support structure, which prevents the L-shaped steel plate supports from bending under stress and improves their vertical bearing capacity. The steel supports rest on the horizontal plates, combined with the threaded steel constraint, forming a double guarantee of "support + circumferential constraint", which completely solves the problem of easy displacement of the steel supports.

[0014] Preferably, the vertical plate and convex surface of the L-shaped steel plate support are fixedly connected by electric welding, and all welds are full welds. The support bracket is fixed to the vertical and horizontal plates of the L-shaped steel plate support by welding. The full welding of the L-shaped steel plate support to the convex surface ensures that the vertical plate of the L-shaped steel plate support fits snugly against the foundation pit retaining surface without gaps, ensuring the strength and sealing of the connection node, preventing failure due to local welding defects, avoiding loosening of the vertical plate under load, and ensuring the stability of the steel waler support foundation. The welded and fixed support bracket forms a rigid connection, further enhancing the structural stability of the L-shaped steel plate support, preventing support failure due to the bracket detaching from the L-shaped steel plate support, and ensuring the reliability of the support under long-term stress.

[0015] Preferably, a water collection well is provided in the middle of the bottom of the foundation pit within the retaining wall. The water collection well is constructed of high-brick masonry, with the outer side of the brickwork finished with mortar. A guide slope is provided at the bottom of the pit from the direction away from the water collection well to the direction closer to the water collection well. The water collection well at the bottom of the pit, constructed of high-brick masonry with mortar finishing, combines "waterproofing" and "structural strength," effectively collecting water accumulated at the bottom of the pit and preventing groundwater from soaking the foundation pit soil, which would lead to a decrease in soil strength and indirectly ensure the stability of the support structure. The guide slope guides the accumulated water to the water collection well, preventing water from accumulating at the bottom of the pit, reducing the erosion of the foundation by accumulated water, and facilitating drainage operations, thereby improving construction convenience and the safety of foundation pit operations.

[0016] The advantages of this utility model include the following: The connection strength and stability are greatly improved: By using threaded steel bars to wrap around both ends of the steel support and directly fixing them to Larssen sheet piles, a strongly constrained rigid connection mechanism is formed. This structure effectively prevents the steel support from axial slippage, vertical tilting, or torsion under stress, greatly enhancing the connection strength and overall stability, and fundamentally avoiding the instability risks that may occur with traditional shelving connections.

[0017] Optimizing the load transfer path and avoiding stress concentration: The connection method of the threaded steel bars directly transfers part of the lateral load borne by the steel support to the Larssen sheet piles, forming an auxiliary force transfer path of "steel support end → threaded steel bar → Larssen sheet piles". This disperses the concentrated stress originally transferred through the bracket nodes, reduces the load on the welded joints of the bracket and steel waler, effectively prevents fatigue cracking at the joints, and improves the durability and safety of the structure.

[0018] Enhanced structural stiffness and resistance to deformation: Triangular steel plate bracing is added at the inside corner of the steel waler, which significantly enhances the local stiffness and bending and shear resistance of the rectangular ring structure in the weak corner area, ensuring the integrity of the steel waler and enabling it to transfer the load to the steel sheet pile more evenly and effectively.

[0019] The support system is more robust and reliable: the combination of L-shaped steel plate supports and support brackets provides a solid and flat support platform for the steel walers and steel supports. Full-welding ensures the strength and reliability of all connection nodes, further enhancing the overall rigidity and stability of the support system.

[0020] Functional integration and convenient construction: The installation of water collection wells and guide slopes solves the problem of foundation pit drainage, ensures the working surface is dry, and improves construction efficiency and safety. Attached Figure Description

[0021] Figure 1 is a structural schematic diagram of the foundation pit support structure of this utility model. Figure 2 is a cross-sectional view of the foundation pit support structure of this utility model. Figure 3 is a structural schematic diagram of the threaded steel connection of this utility model. Figure 4 is a structural schematic diagram of the stiffening rib of this utility model. Figure 5 is a structural schematic diagram of the L-shaped steel plate support and support bracket of this utility model. Figure 6 is a structural schematic diagram of the steel plate brace of this utility model. Figure 7 is a structural schematic diagram of the water collection well of this utility model. Explanation of reference numerals: 1. Larssen sheet piles; 2. Steel walers; 21. Internal corners; 22. Stiffening ribs; 3. Steel supports; 4. Excavation pit retaining surface; 41. Convex surface; 42. Concave surface; 43. Pouring gap; 5. Threaded steel bars; 6. Steel plate bracing; 7. L-shaped steel plate supports; 8. Support brackets; 9. Sump well. Detailed Implementation

[0022] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0023] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0024] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 7 As shown, a foundation pit support structure includes several Larssen sheet piles 1, several steel walers 2, and steel supports 3. The Larssen sheet piles 1 are type IV steel piles. All Larssen sheet piles 1 are interlocked and connected to form a rectangular foundation pit retaining surface 4. The foundation pit retaining surface 4 includes several convex surfaces 41 and several concave surfaces 42 that are alternately arranged. The Larssen sheet piles 1 are U-shaped. The side of the U-shaped Larssen sheet piles 1 facing inwards from the foundation pit retaining surface 4 forms a convex surface 41, and the side of the U-shaped Larssen sheet piles 1 facing outwards from the foundation pit retaining surface 4 forms a concave surface 42. The extension direction of each waler segment of the steel waler 2 is consistent with the extension direction of its corresponding Larssen sheet pile 1. The steel walers 2 are of type HW400. All steel walers 2 are installed on the inner side of the foundation pit retaining surface 4, and all steel walers 2 form a rectangular ring structure. The outer side of the steel walers 2 is fixedly connected to the convex surface 41, and a pouring gap 43 is formed between the steel walers 2 and the concave surface 42, which can be used to pour concrete later to further enhance the overall integrity. The inner side of the steel walers 2 is connected to the steel support 3, such as... Figure 3As shown, the steel support 3 is of type HW400 and is horizontally arranged. Both ends of the steel support 3 are connected to the steel walers 2 on both sides. Both ends of the steel support 3 are secured to the Larssen sheet pile 1 by wrapping a threaded steel bar 5 around the support at least once. The specific number of wraps depends on the actual application, but is generally three times. The diameter of the threaded steel bar 5 is 15-25mm. A diameter that is too small is prone to breakage under stress, failing to provide effective restraint; a diameter that is too large increases weight and bending difficulty, making it difficult to tightly wrap around the steel support 3. 20mm is preferred, ensuring sufficient tensile strength and gripping force while also considering construction feasibility and economy, ensuring the durability and load-bearing capacity of the connection structure. The threaded steel bar 5 is fixed to the Larssen sheet pile 1 by welding. Welding forms a rigid connection without gaps, avoiding displacement caused by gaps under load, and further strengthening the restraining effect of the threaded steel bar 5 on the steel support 3. Figure 4 As shown, at least five stiffening ribs 22 are provided at the connection point between the steel waler 2 and the end of the steel support 3, and all stiffening ribs 22 are arranged at equal intervals along the extension direction of the steel waler 2. The support strength and connection stability are further enhanced by the number of stiffening ribs 22.

[0027] The foundation pit support structure uses threaded steel bars 5 to form a circumferential constraint, restricting the horizontal displacement and rotation of the steel support 3 ends, preventing slippage of the steel support 3, greatly improving connection stability, avoiding the slippage and detachment problems that are prone to occur in traditional shelving connections, and improving the safety and reliability of the support system; the steel waler 2 is only fixed to the convex surface 41 and leaves a casting gap 43 with the concave surface 42, which not only ensures a reliable connection between the steel waler 2 and the foundation pit retaining surface 4, but also reserves space for possible subsequent filling and reinforcement, adapting to the concave-convex structure characteristics of the Larssen steel sheet pile 1; the overall rectangular foundation pit retaining surface 4, together with the annular steel waler 2 and the transverse steel support 3, forms a closed-loop force system, optimizes the load transfer path, reduces local stress concentration, and improves the overall lateral displacement resistance of the support structure.

[0028] like Figure 1 and 6As shown, triangular steel plate supports 6 are welded to the inside corners 21 of the rectangular ring-shaped steel waler 2. These triangular supports 6 are fixed to the inside corners 21 by welding, utilizing the "geometric stability" characteristic of triangles to distribute the concentrated load at the inside corners 21, converting vertical and horizontal forces into axial forces on the steel plate supports 6, thus preventing cracking or bending at the inside corners 21 of the steel waler 2; enhancing the overall rigidity of the ring-shaped steel waler 2, ensuring it maintains its rectangular shape under load and does not undergo local deformation, and guaranteeing balanced force distribution at both ends of the steel support 3. There are two steel plate supports 6, arranged vertically and alternately; each steel plate support 6 has a thickness of 1.5-2.5 cm. By aligning two steel plates 6 vertically, a "double-layer support" is formed. Compared with a single steel plate 6, it can cover a larger stress area at the inside corner 21, further dispersing the load and improving the corner's resistance to deformation. The thickness is preferably designed to be 2cm, which meets the support strength requirements while avoiding material waste and construction space occupation caused by excessively thick steel plates, thus balancing "structural strength" and "economy".

[0029] like Figure 5 As shown, an L-shaped steel plate support 7 for supporting the steel waler 2 is provided on the inner side of the pit retaining surface 4. The vertical plate of the L-shaped steel plate support 7 is fixedly connected to the convex surface 41, and the horizontal plate of the L-shaped steel plate support 7 is used to support the steel waler 2. A support bracket 8 is also fixedly connected between the vertical plate and the horizontal plate of the L-shaped steel plate support 7. The two ends of the steel support 3 rest on the horizontal plates of the L-shaped steel plate support 7 on both sides. By fixing the vertical plate of the L-shaped steel plate support 7 to the convex surface 41 and supporting the steel waler 2 and the steel support 3 with the horizontal plate, a reliable support point is provided for the steel waler 2, and the horizontal displacement of the steel waler 2 is restricted by the vertical plate. The support bracket 8 connects the vertical plate and the horizontal plate of the L-shaped steel plate support 7 to form a triangular support structure, which prevents the L-shaped steel plate support 7 from bending due to stress and improves its vertical bearing capacity. The steel support 3 rests on the horizontal plate and is constrained by the threaded steel 5, forming a double guarantee of "support + circumferential constraint", which completely solves the problem of easy displacement of the steel support 3. The vertical plate of the L-shaped steel plate support 7 is fixedly connected to the convex surface 41 by electric welding, and all welds are full welds. The support bracket 8 is fixed to the vertical and horizontal plates of the L-shaped steel plate support 7 by welding. The full welding between the L-shaped steel plate support 7 and the convex surface 41 ensures that the vertical plate of the L-shaped steel plate support 7 fits snugly against the foundation pit retaining surface 4 without gaps, ensuring the strength and sealing of the connection node, preventing failure due to local welding defects, avoiding loosening of the vertical plate under load, and ensuring the stability of the steel waler 2 support foundation. The support bracket 8 is fixed by welding to form a rigid connection, further strengthening the structural stability of the L-shaped steel plate support 7, preventing support failure due to the bracket detaching from the L-shaped steel plate support 7, and ensuring the reliability of the support under long-term stress.

[0030] like Figure 7As shown, a water collection well 9 is installed in the middle of the bottom of the foundation pit within the retaining surface 4. The water collection well 9 is constructed of high-brick masonry, with mortar plaster applied to the outer side of the brickwork. A guide slope is provided at the bottom of the pit from the direction away from the water collection well 9 to the direction closer to it. The water collection well 9 at the bottom of the pit, constructed of high-brick masonry and plastered with mortar, combines "waterproofing" and "structural strength," effectively collecting water accumulated at the bottom of the pit and preventing groundwater from soaking the foundation pit soil, which would lead to a decrease in soil strength and indirectly ensure the stability of the support structure. The guide slope guides the accumulated water to the water collection well 9, preventing water from accumulating at the bottom of the pit, reducing the erosion of the foundation by accumulated water, and facilitating drainage operations, thereby improving construction convenience and the safety of foundation pit operations.

[0031] In summary, the advantages of this utility model are that by using threaded steel bars 5 to surround the ends of the steel support 3 and directly welding them to the Larssen sheet piles 1, a rigid connection is formed, which greatly enhances the connection strength, rigidity, and overall stability of the support node, effectively preventing slippage and instability. This structure optimizes the load transfer path, reduces stress concentration at traditional bracket nodes, and improves structural durability. Simultaneously, the added triangular steel plate brace 6 strengthens the rigidity at the corners of the steel waler 2, and the combination of the L-shaped steel plate support 7 and the support bracket 8 provides a stable support platform. The integrated drainage design further ensures construction safety and efficiency; the overall structure is safe and reliable, and suitable for deep foundation pit projects under complex geological conditions.

[0032] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0033] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A foundation pit support structure, characterized in that, The structure includes several Larssen sheet piles (1), several steel walers (2), and steel supports (3); all Larssen sheet piles (1) are interlocked and connected to form a rectangular foundation pit retaining surface (4), which includes several convex surfaces (41) and several concave surfaces (42) arranged alternately; all steel walers (2) are installed on the inner side of the foundation pit retaining surface (4), and all steel walers (2) form a rectangular ring structure; the steel walers (2) are fixedly connected to the convex surfaces (41), and a casting gap (43) is formed between the steel walers (2) and the concave surfaces (42); the steel supports (3) are arranged horizontally, and the two ends of the steel supports (3) are respectively connected to the steel walers (2) on both sides, and both ends of the steel supports (3) are fixedly connected to the Larssen sheet piles (1) after being wrapped with threaded steel (5) at least once.

2. The foundation pit support structure according to claim 1, characterized in that, At least five stiffening ribs (22) are provided at the position where the steel waler (2) is connected to the end of the steel support (3), and all stiffening ribs (22) are arranged at intervals along the extension direction of the steel waler (2).

3. The foundation pit support structure according to claim 1 or 2, characterized in that, The diameter of the rebar (5) is 15-25mm.

4. The foundation pit support structure according to claim 1 or 2, characterized in that, The threaded steel (5) and the Larssen sheet pile (1) are fixed by welding.

5. The foundation pit support structure according to claim 1, characterized in that, At the inside corners (21) of the steel waler (2) of the rectangular ring structure, triangular steel plate supports (6) are welded together.

6. The foundation pit support structure according to claim 5, characterized in that, The number of steel plate supports (6) is two, and the two steel plate supports (6) are arranged vertically and alternately; the thickness of each steel plate support (6) is 1.5-2.5cm.

7. The foundation pit support structure according to claim 1, characterized in that, The inner side of the foundation pit retaining surface (4) is provided with an L-shaped steel plate support (7) for supporting the steel waler (2), and the vertical plate of the L-shaped steel plate support (7) is fixedly connected to the convex surface (41). The horizontal plate of the L-shaped steel plate support (7) is used to support the steel waler (2). A support bracket (8) is also fixedly connected between the vertical plate and the horizontal plate of the L-shaped steel plate support (7). The two ends of the steel support (3) rest on the horizontal plates of the L-shaped steel plate support (7) on both sides.

8. The foundation pit support structure according to claim 7, characterized in that, The vertical plate and the convex surface (41) of the L-shaped steel plate support (7) are fixedly connected by electric welding, and all welds are full welds. The support bracket (8) is fixed to the vertical plate and the horizontal plate of the L-shaped steel plate support (7) by welding.

9. The foundation pit support structure according to claim 1, characterized in that, A water collection well (9) is provided in the middle of the bottom of the pit within the retaining surface (4) of the foundation pit. The water collection well (9) adopts a high brick masonry structure, and the outer side of the brick masonry is plastered with mortar. A guide slope is provided at the bottom of the pit from the direction away from the water collection well (9) to the direction close to the water collection well (9).

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