Foundation pit supporting structure

Abstract

The utility model relates to a foundation pit supporting structure which comprises a foundation pit, a supporting plate, an inclined supporting rod, a drainage pile and a supporting pile. A foundation trench is formed in the bottom surface of the foundation pit; the supporting piles are continuously arranged on the side, away from the side wall of the foundation pit, in the foundation trench, the upper ends of the supporting piles upwards extend out of the foundation trench, and the sides, close to the side wall of the foundation pit, of the supporting piles are fixedly connected with pressing feet. The drainage piles are continuously arranged on the side, close to the side wall of the foundation pit, in the foundation trench and located in the foundation trench, and drainage channels are formed in the drainage piles; the side, away from the side wall of the foundation pit, of the drainage pile is fixedly connected with a pressing head, and the pressing head is correspondingly attached to the pressing foot. The supporting plate is arranged on the side wall of the foundation pit; the upper end of the inclined supporting rod abuts against the supporting plate, the lower end of the inclined supporting rod is fixed to the pressing head and abuts against the side wall of the supporting pile at the same time, a stable supporting foundation is provided for the lower end of the inclined supporting rod, and the situation that the bottom of the inclined supporting rod is prone to sliding, so that supporting fails or loses the supporting effect is avoided; and the reliability and the stability of inclined strut supporting are effectively improved.

Description

Technical Field

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

[0002] During foundation pit construction, the stability of the pit sidewalls is one of the key factors for construction safety. After the foundation pit is excavated, the stress in the soil is redistributed, which can easily lead to problems such as sidewall instability and collapse, especially in deep foundation pits or soft soil layers. To prevent the pit sidewalls from becoming unstable, diagonal bracing is often installed at the bottom of the pit to support the sidewalls.

[0003] The soil layer at the bottom of the excavation pit is frequently affected by seepage and precipitation, making it prone to softening and settlement, significantly reducing its bearing capacity, especially when the drainage system is inadequate or drainage is not timely. This situation is more common in soft soil or clay soil areas, where the soil particles are fine, drainage is slow, and the soil is prone to plastic deformation after becoming saturated with water, thus reducing its bearing capacity.

[0004] Softening and settlement of the soil at the bottom of the foundation pit can lead to instability in the bottom support foundation of the diagonal bracing, making the bottom of the diagonal bracing prone to slippage. This can cause the support to fail or lose its supporting function, negatively impacting the stability of the foundation pit sidewall. For example, in a foundation pit support device and method disclosed in CN117188488A, the support plate is fixed to the sidewall of the foundation pit. When there is a risk of collapse in the foundation pit, the support rod can easily push the limiting block to slip on the bottom surface of the foundation pit, resulting in poor support effect and a high risk of accidents.

[0005] Therefore, it is necessary to study a foundation pit support structure. Utility Model Content

[0006] Therefore, the purpose of this utility model is to provide a foundation pit support structure that can effectively solve the problem of instability of the bottom support foundation of the diagonal bracing due to the softening caused by water seepage and precipitation at the bottom of the foundation pit.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A foundation pit support structure includes a foundation pit, a support plate, diagonal braces, drainage piles, and support piles;

[0009] The bottom surface of the foundation pit is provided with a continuous foundation trench;

[0010] The support piles are continuously installed in the foundation trench on the side away from the foundation pit. The upper end of the support pile extends upward out of the foundation trench, and a pressure foot is fixedly connected to the side of the support pile near the foundation pit.

[0011] The drainage piles are continuously installed in the foundation trench on one side of the foundation pit near the side wall of the foundation pit and located in the foundation trench. The upper end face of the drainage pile has a drainage channel with an upper opening. A pressure head is fixedly connected to the side of the drainage pile away from the foundation pit. The pressure head is correspondingly fitted on the pressure foot. The upper end face of the pressure head is lower than the upper end face of the support pile.

[0012] The support plate is installed on the side wall of the foundation pit;

[0013] The upper end of the diagonal brace is abutted against the support plate, and the lower end of the diagonal brace is fixed to the pressure head and simultaneously abuts against the side wall of the support pile.

[0014] Furthermore, it also includes connecting anchor bolts, which pass vertically through the pressure head and pressure foot and are anchored to the bottom of the pit.

[0015] Furthermore, it also includes fixed anchor bolts, which pass through the support plate and are anchored in the side wall of the pit.

[0016] Furthermore, the upper end of the diagonal brace is provided with an upper fixing plate that corresponds to and fits with the support plate, and the upper fixing plate is fixedly connected to the support plate through a fixing anchor; the lower end of the diagonal brace is provided with a horizontal lower fixing plate, and the lower fixing plate is fixedly connected to the pressure head through a connecting anchor, and the side wall of the lower fixing plate abuts against the side wall of the support pile.

[0017] Furthermore, a waterproof slope-finding layer is provided at the bottom of the foundation pit, and the waterproof slope-finding layer is located between the side wall of the foundation pit and the drainage ditch.

[0018] Furthermore, the contact surfaces of the pressure head and pressure foot are inclined surfaces facing away from the side wall of the pit and upwards.

[0019] Furthermore, a drainage pipe is installed in the side wall of the pit, with one end of the drainage pipe passing outward through the support plate and connected to a drainage hose, which extends into the drainage ditch.

[0020] Furthermore, it also includes a permeable layer, which is set in the foundation trench and located below the drainage piles and support piles.

[0021] Furthermore, reinforcing anchor rods are pre-embedded in the support piles, and the reinforcing anchor rods extend vertically downwards and are anchored to the bottom of the foundation pit.

[0022] The beneficial effects of the above technical solution are:

[0023] This invention involves creating a foundation trench within the excavation pit, and installing continuous support piles and drainage piles within the trench. The pressure head on the drainage pile is correspondingly fitted onto the pressure foot, with the upper end of the pressure head lower than the upper end of the support pile. This allows the lower end of the diagonal brace to be fixed to the pressure head and simultaneously abut against the side wall of the support pile. This optimizes the drainage structure and diagonal brace support structure at the bottom of the excavation pit, providing a stable support foundation for the lower end of the diagonal brace. It effectively solves the problem of instability in the bottom support foundation of the diagonal brace due to softening caused by water seepage and precipitation at the bottom of the excavation pit. It avoids slippage at the bottom of the diagonal brace, which could lead to support failure or loss of support function. It is particularly suitable for water-rich areas or soft clay soil areas, effectively improving the reliability and stability of the diagonal brace support. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the present invention.

[0025] Attached diagram labels: 1 for foundation pit, 2 for support plate, 3 for diagonal brace, 4 for drainage pile, 5 for support pile, 6 for connecting anchor, 7 for fixed anchor, 8 for upper fixing plate, 9 for lower fixing plate, 10 for waterproof slope layer, 11 for drainage pipe, 12 for drainage hose, 13 for seepage layer, 14 for reinforcing anchor, 401 for pressure head, 402 for drainage ditch, 501 for pressure foot. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0027] This embodiment aims to provide a foundation pit support structure, which is mainly used to support the sidewalls of the foundation pit, addressing the problem that the bottom of the foundation pit is easily softened by water seepage and precipitation, leading to instability of the bottom support foundation of the diagonal bracing.

[0028] A foundation pit support structure, such as Figure 1 It includes a foundation pit 1, a support plate 2, a diagonal brace 3, a drainage pile 4, and a support pile 5; the side wall of the foundation pit 1 is a vertical surface.

[0029] The bottom surface of the foundation pit 1 is excavated with a rectangular foundation trench that runs continuously along the side wall of the foundation pit 1; the support piles 5 are continuously cast and installed in the foundation trench on the side away from the side wall of the foundation pit 1, the upper end of the support piles 5 extends upward out of the foundation trench, and the side of the support piles 5 near the side wall of the foundation pit 1 is fixedly connected with a pressure foot 501, and the pressure foot 501 and the support piles 5 are integrally formed structures.

[0030] The drainage pile 4 is continuously cast and installed in the foundation trench near the side wall of the foundation pit 1 and located within the trench. In other embodiments, the drainage pile 4 can also be a precast structure. The upper end face of the drainage pile 4 has a drainage channel 402 with an upper opening. A pressure head 401 is fixedly connected to the side of the drainage pile 4 away from the side wall of the foundation pit 1. The drainage pile 4 and the support pile 5 are arranged closely together and completely fill the foundation trench. The pressure head 401 is correspondingly fitted onto the pressure foot 501, and the upper end face of the pressure head 401 is lower than the upper end face of the support pile 5. The contact surfaces of the pressure head 401 and the pressure foot 501 are inclined surfaces facing away from the side wall of the foundation pit 1 and upward, so as to optimize the stress situation of the pressure head 401 and the pressure foot 501 and enhance the stability of the structure.

[0031] To further improve the connection strength between the pressure head 401 and the pressure foot 501 and to prevent the support pile 5 from slipping, the pressure head 401 and the pressure foot 501 are respectively opened or reserved with anchor holes. The connecting anchor rod 6 passes vertically through the anchor holes of the pressure head 401 and the pressure foot 501 and is anchored to the bottom of the foundation pit 1, thereby fixing the pressure head 401 and the pressure foot 501 into a whole and forming a fixed relationship with the bottom of the foundation pit 1.

[0032] The support plate 2 is continuously and fixedly installed on the side wall of the foundation pit 1. The specific structure of the support plate 2 can be an existing retaining wall, jet grouting pile, etc., mainly used to form support for the side wall of the foundation pit 1 and provide a fixed foundation for the diagonal bracing rod 3. In this embodiment, the support pile 5 is anchored to the side wall of the foundation pit 1 by the fixed anchor rod 7. The fixed anchor rod 7 passes through the support plate 2 and is anchored in the side wall of the foundation pit 1.

[0033] The upper end of the diagonal brace 3 abuts against the support plate 2, and the lower end of the diagonal brace 3 is fixed to the pressure head 401 and simultaneously abuts against the side wall of the support pile 5. An upper fixing plate 8, corresponding to and fitting against the support plate 2, is fixed to the upper end of the diagonal brace 3. The upper fixing plate 8 is fixedly connected to the support plate 2 via a fixing anchor 7, meaning that the fixing anchor 7 at this location passes through the upper fixing plate 8 and the support plate 2 sequentially and is anchored in the side wall of the pit 1. A horizontal lower fixing plate 9 is provided at the lower end of the diagonal brace 3. The lower fixing plate 9 is fixedly connected to the pressure head 401 via a connecting anchor 6, and the side wall of the lower fixing plate 9 abuts against the side wall of the support pile, allowing the support pile 5 to provide additional lateral restraint for the lower fixing plate 9 and prevent slippage.

[0034] Furthermore, a waterproof slope-finding layer 10 is provided at the bottom of the foundation pit 1. The waterproof slope-finding layer 10 is located between the side wall of the foundation pit 1 and the drainage ditch 402. The waterproof slope-finding layer 10 is inclined towards the drainage ditch 402 so as to drain any possible seepage water in the side wall of the foundation pit 1 and the accumulated water at the bottom of the foundation pit 1 into the drainage ditch 402.

[0035] Furthermore, a drainage pipe 11 is installed in the side wall of the pit 1. One end of the drainage pipe 11 passes outward through the support plate 2 and is connected to a drainage hose 12. The drainage hose 12 extends into the drainage ditch 402. The drainage pipe 11 is fixedly connected to the diagonal brace 3 by binding.

[0036] Furthermore, it also includes a permeable layer 13, which is laid in the foundation trench and located below the drainage piles 4 and the support piles 5 to prevent buoyancy from forming on the drainage ditch 402 and the support piles 5 when the groundwater level rises.

[0037] Furthermore, a reinforcing anchor rod 14 is pre-embedded in the support pile 5. The reinforcing anchor rod 14 extends vertically downward and is anchored to the bottom of the foundation pit 1, so that the cast-in-place support pile 5 can be stably and fixedly connected to the bottom of the foundation pit 1, thereby enhancing the stability of the support pile 5.

Claims

1. A foundation pit support structure, characterized in that: Includes foundation pit (1), support plate (2), diagonal brace (3), drainage pile (4) and support pile (5); The bottom surface of the foundation pit (1) is provided with a continuous foundation trench; The support piles (5) are continuously installed on the side wall away from the pit (1) in the foundation trench. The upper end of the support piles (5) extends upward out of the foundation trench. The support piles (5) are fixedly connected to the side wall of the pit (1) with a pressure foot (501). The drainage piles (4) are continuously installed in the trench on one side of the side wall near the pit (1) and located in the trench. The upper end face of the drainage piles (4) is provided with a drainage channel (402) with an upper opening. A pressure head (401) is fixedly connected to the side wall away from the pit (1) of the drainage piles (4). The pressure head (401) is correspondingly fitted on the pressure foot (501). The upper end face of the pressure head (401) is lower than the upper end face of the support pile (5). The support plate (2) is installed on the side wall of the pit (1); The upper end of the diagonal brace (3) is abutted on the support plate (2), and the lower end of the diagonal brace (3) is fixed on the pressure head (401) and simultaneously abuts against the side wall of the support pile (5).

2. The foundation pit support structure according to claim 1, characterized in that: It also includes connecting anchor rods (6), which pass vertically through the pressure head (401) and the pressure foot (501) and are anchored to the bottom of the pit (1).

3. The foundation pit support structure according to claim 2, characterized in that: It also includes fixed anchor bolts (7), which pass through the support plate (2) and are anchored in the side wall of the pit (1).

4. The foundation pit support structure according to claim 3, characterized in that: The upper end of the diagonal brace (3) is provided with an upper fixing plate (8) that corresponds to and fits with the support plate (2). The upper fixing plate (8) is fixedly connected to the support plate (2) through a fixed anchor rod (7). The lower end of the diagonal brace (3) is provided with a horizontal lower fixing plate (9). The lower fixing plate (9) is fixedly connected to the pressure head (401) through a connecting anchor rod (6), and the side wall of the lower fixing plate (9) abuts against the side wall of the support pile (5).

5. A foundation pit support structure according to any one of claims 1-4, characterized in that: The bottom of the foundation pit (1) is provided with a waterproof slope layer (10), which is located between the side wall of the foundation pit (1) and the drainage ditch (402).

6. The foundation pit support structure according to claim 5, characterized in that: The contact surfaces of the pressure head (401) and the pressure foot (501) are inclined surfaces facing away from the side wall of the pit (1) and upward.

7. A foundation pit support structure according to claim 6, characterized in that: A drainage pipe (11) is provided in the side wall of the foundation pit (1). One end of the drainage pipe (11) passes outward through the support plate (2) and is connected to a drainage hose (12). The drainage hose (12) extends into the drainage ditch (402).

8. The foundation pit support structure according to claim 7, characterized in that: It also includes a permeable layer (13), which is set in the foundation trench and located below the drainage piles (4) and the support piles (5).

9. A foundation pit support structure according to claim 8, characterized in that: The support pile (5) is pre-embedded with a reinforcing anchor (14), which extends vertically downward and is anchored to the bottom of the foundation pit (1).

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