A foundation pit support structure

Abstract

This utility model provides a foundation pit support structure, belonging to the field of foundation pit support engineering, including a foundation pit, a support assembly, and a buffer connection assembly. The support assembly includes a retaining plate that fits against the inner wall of the foundation pit, a horizontal rib that fits against the retaining plate, and a telescopic support rod. The buffer connection assembly is located between the support rod and the horizontal rib, and includes a fixed seat, an arc-shaped movable top block with a rubber buffer layer, and an elastic element. The support rod is equipped with adjusting bolts to adjust its length. This utility model achieves a combination of elastic buffering and rigid support through the buffer connection assembly, absorbing the impact of soil pressure fluctuations, avoiding stress concentration, and improving the stability and durability of the support. The telescopic support rod is adaptable to foundation pits of different widths, making it highly practical.

Description

Technical Field

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

[0002] In construction projects, foundation pits require support after excavation to prevent collapse and ensure construction safety. Existing foundation pit support systems mostly use rigid support structures (such as tool-type supports that directly abut against horizontal beams). However, soil pressure changes dynamically with construction and environmental factors. Rigid supports are prone to stress concentration due to pressure fluctuations, leading to component deformation and damage, and reducing the durability and stability of the support. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a foundation pit support structure that can buffer soil pressure impact and improve support stability and durability.

[0004] The objective of this utility model is achieved through the following technical solution: A foundation pit support structure includes a foundation pit; it also includes support components and buffer connection components; several support components are installed inside the foundation pit, and the left and right ends of the support components respectively abut against the inner walls of both sides of the foundation pit to prevent the foundation pit from collapsing; the support components include: retaining plates, crossbeams, and support rods; the retaining plates are set against the inner walls of both sides of the foundation pit; the crossbeams are set laterally inside the foundation pit and are attached to the surface of the retaining plates; the support rods are set horizontally, and their left and right ends are attached to the crossbeams; the buffer connection components are set between the support rods and the crossbeams; the support rods are telescopic, and the support rods are equipped with adjusting bolts; the adjusting bolts are used to adjust the length of the support rods so that the crossbeams are tightened through the buffer connection components.

[0005] The buffer connection assembly includes a fixed base, a movable top block, and an elastic element; the fixed base is fixedly connected to the end of the support rod; the movable top block is in contact with the crossbeam; the elastic element is disposed between the fixed base and the movable top block, and is used to provide the movable top block with an elastic preload towards the crossbeam.

[0006] The elastic element is a spring, which is sleeved on the end of the support rod and its two ends abut against the fixed seat and the movable top block, respectively; the spring is a cylindrical helical spring with a wire diameter of 2mm to 5mm.

[0007] The fixed base has a positioning hole for inserting the end of the support rod, and the support rod is fixed to the positioning hole by welding.

[0008] The surface of the movable top block that abuts against the crossbeam is an arc-shaped surface, and a rubber buffer layer is bonded to the surface of the arc-shaped surface, the thickness of the rubber buffer layer being 1mm to 3mm.

[0009] The lower end of the retaining plate is inserted into the soil layer at the bottom of the foundation pit to a depth of 300mm to 500mm.

[0010] Along the depth direction of the foundation pit, at least two layers of support components and corresponding buffer connection components are provided at intervals, with a vertical spacing of 800mm to 1200mm between adjacent layers of support components.

[0011] The retaining plate is made of steel plate with a thickness of 5mm to 10mm and a width of 200mm to 400mm.

[0012] The support rod is a metal telescopic rod, including an inner rod and an outer rod that are nested together. The adjusting bolt is set on the outer rod and is used to lock the relative position of the inner rod and the outer rod.

[0013] Both the inner and outer rods are made of Q235 steel. The outer diameter of the inner rod is 0.5mm to 1mm smaller than the inner diameter of the outer rod to achieve a sliding fit.

[0014] The beneficial effects of this utility model are: 1. By using a buffer connection component, the rigid contact between the support rod and the crossbeam is changed to a contact with elastic buffer. The elastic component absorbs the impact energy of soil pressure fluctuations, avoids stress concentration, alleviates damage to the support components, and improves the stability and durability of the support.

[0015] 2. The telescopic support rod, together with the adjusting bolt, can flexibly adapt to foundation pits of different widths; the buffer connection component works in conjunction with the telescopic structure to ensure the adaptability of the support and enhance the ability to adapt to changes in earth pressure, making it highly practical.

[0016] 3. The curved surface design and rubber buffer layer of the movable top block not only adapt to the stress surface of the crossbeams, but also help buffer minor impacts through rubber deformation, while increasing the friction with the crossbeams to prevent the contact surface from sliding. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] Figure 1 This is a structural schematic diagram of the present invention.

[0019] The diagram shows: 1-Retaining plate; 2-Horizontal timber; 3-Support rod; 4-Adjusting bolt; 5-Foundation pit. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0021] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it 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 this utility model based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0023] like Figure 1 As shown, a foundation pit support structure includes: a support component, a buffer connection component, and a foundation pit 5.

[0024] There are several support components installed inside the foundation pit 5, and the left and right ends of the support components abut against the inner walls of the two sides of the foundation pit 5 to prevent the foundation pit 5 from collapsing.

[0025] The support assembly includes: a retaining plate 1, a horizontal beam 2, and a support rod 3; the retaining plate 1 is fitted against the inner walls of both sides of the foundation pit 5; the horizontal beam 2 is horizontally positioned within the foundation pit 5 and is fitted against the surface of the retaining plate 1; the support rod 3 is positioned horizontally, with both ends fitted against the horizontal beam 2; the lower end of the retaining plate 1 is inserted into the soil layer at the bottom of the foundation pit to a depth of 300mm to 500mm; at least two layers of support assemblies and corresponding buffer connection assemblies are spaced apart along the depth direction of the foundation pit 5, with a vertical spacing of 800mm to 1200mm between adjacent layers of support assemblies; the retaining plate 1 is made of steel plate with a thickness of 5mm to 10mm and a width of 200mm to 400mm; the support rod 3 is a metal telescopic rod, including an inner rod and an outer rod that are nested together, and an adjusting bolt 4 is set on the outer rod to lock the relative position of the inner rod and the outer rod.

[0026] Both the inner and outer rods are made of Q235 steel. The outer diameter of the inner rod is 0.5mm to 1mm smaller than the inner diameter of the outer rod to achieve a sliding fit.

[0027] The buffer connection assembly is disposed between the support rod 3 and the crossbeam 2; the support rod 3 is telescopic and is provided with an adjusting bolt 4; the adjusting bolt 4 is used to adjust the length of the support rod 3 so as to tighten the crossbeam 2 through the buffer connection assembly; the buffer connection assembly includes a fixed seat, a movable top block and an elastic element; the fixed seat is fixedly connected to the end of the support rod 3; the movable top block fits against the crossbeam 2; the elastic element is disposed between the fixed seat and the movable top block, and is used to provide the movable top block with a direction towards the crossbeam. The elastic preload of wood 2; the elastic element is a spring, which is sleeved on the end of the support rod 3, and both ends abut against the fixed seat and the movable top block respectively; the spring is a cylindrical helical spring with a wire diameter of 2mm to 5mm; the fixed seat has a positioning hole for the end of the support rod 3 to be inserted, and the support rod 3 is fixed to the positioning hole by welding; the surface of the movable top block that abuts against the crossbeam wood 2 is an arc-shaped surface, and a rubber buffer layer is bonded to the surface of the arc-shaped surface, and the thickness of the rubber buffer layer is 1mm to 3mm.

[0028] The working principle of this utility model: After the foundation pit 5 is excavated, the retaining plate 1 is first attached to the inner wall of the foundation pit 5 and inserted into the bottom soil layer; then the horizontal beam 2 is attached to the outside of the retaining plate 1; then the support rod 3 and the buffer connection assembly are installed. The support rod 3 is extended and retracted by adjusting the bolt 4 so that the buffer connection assembly at both ends is pressed against the horizontal beam 2 (at this time, the spring is pre-compressed to provide continuous pre-tightening force).

[0029] When earth pressure fluctuates dynamically: the earth pressure is transmitted to the movable top block through the retaining plate 1 and the horizontal joists 2. If the pressure increases, the movable top block compresses the spring, using the spring deformation to absorb the impact; if the pressure decreases, the spring releases its preload, pushing the movable top block to maintain contact with the horizontal joists 2. Through the synergy of "elastic buffer + rigid support", the system adapts to changes in earth pressure, improving the safety and durability of the support.

[0030] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A foundation pit support structure comprising a foundation pit (5); characterized in that: It also includes a support assembly and a buffer connection assembly; there are several support assemblies, which are installed in the foundation pit (5), and the left and right ends of the support assemblies respectively abut against the inner walls of the two sides of the foundation pit (5) to prevent the foundation pit (5) from collapsing; the support assembly includes: a retaining plate (1), a crossbeam (2), and a support rod (3); the retaining plate (1) is set against the inner walls of both sides of the foundation pit (5); the crossbeam (2) is set horizontally in the foundation pit (5) and is attached to the surface of the retaining plate (1); the support rod (3) is set in the horizontal direction and its left and right ends are attached to the crossbeam (2); the buffer connection assembly is set between the support rod (3) and the crossbeam (2); the support rod (3) is telescopic and is provided with an adjusting bolt (4); the adjusting bolt (4) is used to adjust the length of the support rod (3) so that the crossbeam (2) is tightened through the buffer connection assembly.

2. The excavation support structure of claim 1, wherein: The buffer connection assembly includes a fixed seat, a movable top block, and an elastic element; the fixed seat is fixedly connected to the end of the support rod (3); the movable top block is in contact with the crossbeam (2); the elastic element is disposed between the fixed seat and the movable top block, and is used to provide the movable top block with an elastic preload towards the crossbeam (2).

3. A foundation pit support structure according to claim 2, wherein: The elastic element is a spring, which is sleeved on the end of the support rod (3) and its two ends abut against the fixed seat and the movable top block respectively; the spring is a cylindrical helical spring with a wire diameter of 2mm to 5mm.

4. The excavation support structure of claim 2, wherein: The fixed base has a positioning hole for inserting the end of the support rod (3), and the support rod (3) is fixed to the positioning hole by welding.

5. The excavation support structure of claim 2, wherein: The surface of the movable top block that abuts against the horizontal rib (2) is an arc-shaped surface, and a rubber buffer layer is bonded to the surface of the arc-shaped surface, the thickness of the rubber buffer layer being 1mm to 3mm.

6. The excavation support structure of claim 1, wherein: The lower end of the retaining plate (1) is inserted into the soil layer at the bottom of the foundation pit, with an insertion depth of 300mm to 500mm.

7. The foundation pit support structure according to claim 1, characterized in that: Along the depth direction of the foundation pit (5), at least two layers of support components and corresponding buffer connection components are provided at intervals, with a vertical spacing of 800mm to 1200mm between adjacent layers of support components.

8. The excavation support structure of claim 1, wherein: The retaining plate (1) is made of steel plate with a thickness of 5mm to 10mm and a width of 200mm to 400mm.

9. The excavation support structure of claim 1, wherein: The support rod (3) is a metal telescopic rod, including an inner rod and an outer rod that are sleeved together. The adjusting bolt (4) is set on the outer rod and is used to lock the relative position of the inner rod and the outer rod.

10. A foundation pit retaining structure according to claim 9, wherein: Both the inner and outer rods are made of Q235 steel. The outer diameter of the inner rod is 0.5mm to 1mm smaller than the inner diameter of the outer rod to achieve a sliding fit.

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