A foundation pit support steel support end connecting node structure with self-locking buckle

Abstract

The utility model provides a kind of end connection node structure of foundation pit support steel support with self-locking buckle, including bottom foundation pit support steel, fixed baffle cooperation clamping seat, clamping seat slot, longitudinal foundation pit support steel, fixed baffle plugboard, limit plate, node support steel fixed baffle, baffle fixed screw and nut, node protective cover, check bolt, buckle shell, U-shaped locking groove, reinforcing rib plate, top foundation pit support steel, self-locking arc buckle, self-locking buckle fastening screw and nut.The structure is realized multidirectional constraint by clamping groove fitting, plugboard limiting and bolt fastening, and it is innovated to cooperate with U-shaped locking groove by self-locking arc buckle, forming mechanical self-locking pre-tightening double anti-loose mechanism.It has the advantages of convenient installation, reliable connection, anti-vibration and anti-loose, and can be reused, significantly improves the construction efficiency, overall stability and safety performance of foundation pit support system, and is suitable for various deep foundation pit engineering.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and more specifically, to a structure for the end connection node of a foundation pit support steel support with a self-locking buckle. Background Technology

[0002] With the advancement of urban underground space development, complex conditions such as deep foundation pits and soft soil foundation pits are increasingly common. As the core load-bearing component of foundation pit support, the reliability of the end connection nodes of steel supports directly determines the stability of the support system. Traditional steel support connection nodes often employ the following technical solutions, but these have significant drawbacks: Existing nodes mostly rely on single bolt connections or simple welding, lacking multi-dimensional constraint mechanisms: for example, ordinary bolt connections only restrict axial displacement, and gaps or slippage are easily generated in the lateral and vertical directions due to earth pressure, making it impossible to form a rigid force transmission system; although some welded nodes are relatively rigid, the welding quality is greatly affected by the on-site working conditions, and weld cracks are prone to occur, resulting in insufficient integrity of the support system and difficulty in withstanding complex earth pressure.

[0003] Traditional nodes require extensive on-site welding or high-precision alignment, with each node taking 2-3 hours to install. Furthermore, they are mostly designed for steel supports with specific cross-sections, making them inflexible and unable to accommodate different cross-sections of square steel tubes. This makes construction extremely difficult in deep foundation pits with tight schedules and limited space.

[0004] Existing nodes rely on ordinary bolts or spring washers for anti-loosening, lacking a mechanical self-locking mechanism: excavation disturbances and vibrations can easily cause bolts to loosen or even components to fall off; some nodes do not consider the impact of dynamic loads, and are prone to slippage failure during long-term service, leading to safety accidents, and the safety redundancy cannot meet the requirements of complex working conditions.

[0005] Welded joints are permanent connections, requiring cutting and dismantling after support is completed, resulting in severe damage to the steel supports. The large amount of welding waste and steel loss contradicts green building principles and leads to high construction costs. Therefore, we have proposed an improvement: a self-locking snap-fit ​​end connection joint structure for foundation pit support steel supports. Utility Model Content

[0006] The purpose of this utility model is to address the problems raised in the existing background technology. To achieve the above-mentioned purpose, this utility model provides the following technical solution: a connection node structure for the end of a foundation pit support steel support with a self-locking buckle, including a bottom foundation pit support steel, a fixed baffle cooperating seat on the left half of the bottom foundation pit support steel, a seat groove installed below the fixed baffle cooperating seat, and the bottom foundation pit support steel clamping into the seat groove, wherein a longitudinal foundation pit support steel is inserted into the fixed baffle cooperating seat groove, and a fixed baffle insert is provided at the front end of the longitudinal foundation pit support steel.

[0007] As a preferred technical solution of this utility model, a fixed baffle limiting plate is fixed on the front plate of the fixed baffle, and a node support steel fixed baffle is connected to the bottom.

[0008] As a preferred technical solution of this utility model, a baffle fixing screw is embedded in the center of the fixed baffle insert, and a baffle fixing nut is provided on the baffle fixing screw.

[0009] As a preferred technical solution of this utility model, two longitudinal foundation pit support steels are provided, and a node protective cover plate is connected to the longitudinal foundation pit support steel on the other side.

[0010] As a preferred technical solution of this utility model, the node protective cover is provided with anti-loosening bolts at both the upper and lower ends, and the longitudinal foundation pit support steel clamp is on the anti-loosening bolts, while the rear plate is embedded with anti-loosening bolts.

[0011] As a preferred technical solution of this utility model, a snap-fit ​​housing is fixed to the top of the longitudinal foundation pit support steel on the left side, a U-shaped locking groove is connected above the snap-fit ​​housing, and a reinforcing rib plate is installed between the snap-fit ​​housing and the rear of the U-shaped locking groove.

[0012] As a preferred technical solution of this utility model, the U-shaped locking groove is provided with a top foundation pit support steel, and the front end of the top foundation pit support steel is provided with a self-locking arc-shaped buckle.

[0013] As a preferred technical solution of this utility model, a self-locking buckle fastening screw is connected between the buckle housing and the self-locking arc buckle, and a self-locking buckle fastening nut is provided on the outside of the self-locking buckle fastening screw.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model effectively restricts the relative displacement of the support steel components in the axial, lateral and vertical directions by using a fixed baffle combined with a card seat, card seat groove, limiting plate and multi-point bolt fastening multiple constraint mechanism, forming a rigid connection node, significantly enhancing the integrity and bearing capacity of the support system, and ensuring structural stability and reliability under complex earth pressure.

[0015] This utility model's nodes adopt a plug-in and snap-fit ​​design, eliminating the need for extensive on-site welding or complex alignment operations. The longitudinal support steel can be directly inserted into the slot of the mounting bracket, and the top support steel is automatically positioned via a self-locking arc-shaped snap-fit. Installation can be completed with a small number of bolts, significantly shortening the construction cycle and improving work efficiency. It is particularly suitable for deep foundation pit projects with tight schedules and limited space.

[0016] This utility model features a self-locking arc-shaped buckle and a U-shaped locking groove structure that automatically forms a mechanical lock after the top support steel is inserted. Furthermore, the self-locking buckle fastening screw and nut apply pre-tightening force, achieving a double insurance of self-locking and fastening. This effectively prevents components from loosening or falling off due to vibration, impact, or unloading, significantly improving safety redundancy.

[0017] This utility model features a node protective cover plate and anti-loosening bolts that form a wrap-around clamp fixation for the longitudinal support steel. Combined with an embedded bolt design, it effectively inhibits bolt loosening and component slippage. All critical connection points are designed to withstand dynamic loads, making it suitable for conditions with frequent excavation disturbances or complex geological conditions, ensuring long-term service safety. All connections are detachable mechanical connections with no permanent welding. After support is completed, it can be completely disassembled and reused for other projects, reducing material waste and construction costs, aligning with green construction and sustainable development engineering concepts. The node structure is reasonable and occupies little space, suitable for various cross-sectional steel supports such as H-beams and square steel pipes, and can flexibly adapt to different pit depths and support system requirements, demonstrating good versatility and engineering promotion value. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the present invention; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 A schematic diagram of the rear structure provided by this utility model; Figure 5 This is a partial structural schematic diagram of the present invention.

[0019] The image shows: 1. Bottom foundation pit support steel; 2. Fixed baffle with mounting bracket; 3. Mounting bracket slot; 4. Longitudinal foundation pit support steel; 5. Fixed baffle insert plate; 6. Fixed baffle limiting plate; 7. Node support steel fixed baffle; 8. Baffle fixing screw; 9. Baffle fixing nut; 10. Node protective cover plate; 11. Cover plate centering groove; 12. Anti-loosening bolt; 13. Clip housing; 14. U-shaped locking groove; 15. Reinforcing rib plate; 16. Top foundation pit support steel; 17. Self-locking arc-shaped clip; 18. Self-locking clip fastening screw; 19. Self-locking clip fastening nut. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0021] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely illustrates some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of this utility model can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] Example 1: A connection node structure for the end of a foundation pit support steel support with a self-locking buckle, including a bottom foundation pit support steel 1, a fixed baffle and a mounting bracket 2 on the left half of the bottom foundation pit support steel 1, a mounting bracket groove 3 installed below the fixed baffle and mounting bracket 2, and a longitudinal foundation pit support steel 4 inserted into the groove of the fixed baffle and mounting bracket 2 inside the mounting bracket groove 3 of the bottom foundation pit support steel 1, and a fixed baffle insert 5 at the front end of the longitudinal foundation pit support steel 4.

[0023] The fixed baffle plate is fixed with a fixed baffle limit plate 6 on the front plate, and the bottom is connected to the node support steel fixed baffle plate 7.

[0024] A baffle fixing screw 8 is embedded in the center of the fixed baffle insert 5, and a baffle fixing nut 9 is provided on the baffle fixing screw 8.

[0025] Two longitudinal foundation pit support steels 4 are provided, and a node protection cover plate 10 is connected to the other longitudinal foundation pit support steel 4.

[0026] The node protective cover plate 10 is provided with anti-loosening bolts 12 at both the upper and lower ends, and the longitudinal foundation pit support steel 4 is clamped on the anti-loosening bolts 12, and anti-loosening bolts 12 are embedded in the rear plate.

[0027] A snap-fit ​​housing 13 is fixed to the top of the longitudinal foundation pit support steel 4 on the left side. A U-shaped locking groove 14 is connected above the snap-fit ​​housing 13. A reinforcing rib plate 15 is installed between the snap-fit ​​housing 13 and the U-shaped locking groove 14.

[0028] The U-shaped locking groove 14 is provided with a top foundation pit support steel 16, and the front end of the top foundation pit support steel 16 is provided with a self-locking arc-shaped buckle 17.

[0029] A self-locking buckle fastening screw 18 is connected between the buckle housing 13 and the self-locking arc buckle 17, and a self-locking buckle fastening nut 19 is provided on the outside of the self-locking buckle fastening screw 18.

[0030] Working principle: The bottom foundation pit support steel 1 serves as the load-bearing foundation of the entire node, and a fixed baffle is installed on its left side to cooperate with the clamping seat 2. The clamping seat has a clamping seat groove 3 below it. The bottom foundation pit support steel 1 is embedded and clamped in the clamping seat groove 3, forming a preliminary mechanical limit and bearing platform to ensure that the bottom component will not slip laterally or detach when under stress.

[0031] Two longitudinal foundation pit support steels 4 are inserted into the grooves of the fixed baffle and the mounting bracket 2 from the left and right sides respectively. The front end of the left longitudinal support steel 4 is provided with a fixed baffle insert 5. After the insert passes through the mounting bracket groove, a fixed baffle limiting plate 6 is fixed at its upper end and a fixed baffle 7 is connected to the node support steel at its lower end, thereby limiting the longitudinal support steel in the vertical direction and preventing it from moving up and down.

[0032] A baffle fixing screw 8 is embedded in the center of the fixed baffle insert 5 and tightened by the baffle fixing nut 9, firmly connecting the insert to the bracket to form a rigid constraint. Simultaneously, a node protective cover 10 is installed on the outside of the right longitudinal support steel 4, with its upper and lower ends connected to the longitudinal support steel 4 by anti-loosening bolts 12. The anti-loosening bolts 12 are embedded in the back plate of the cover, not only enhancing the connection rigidity but also preventing loosening and detachment, thus improving the stability of the node under vibration or dynamic loads.

[0033] A snap-fit ​​housing 13 is fixed to the top of the longitudinal foundation pit support steel 4 on the left side, and a U-shaped locking groove 14 is connected above it. The two are reinforced by a reinforcing rib plate 15 to improve the overall bending and torsional resistance. The U-shaped locking groove 14 is used to accommodate the top foundation pit support steel 16, and the front end of the top support steel is provided with a self-locking arc-shaped snap-fit ​​17. When the top support steel 16 is inserted into the U-shaped groove, the self-locking arc-shaped snap-fit ​​17 automatically snaps into the corresponding groove or limiting surface of the snap-fit ​​housing 13 under the action of gravity or pre-tightening force, forming an initial self-locking.

[0034] To ensure the reliability of the self-locking mechanism, a self-locking buckle fastening screw 18 is inserted between the buckle housing 13 and the self-locking arc-shaped buckle 17, and tightened by a self-locking buckle fastening nut 19. This screw not only provides additional axial clamping force, ensuring a tight fit between the arc-shaped buckle and the housing, but also prevents the buckle from loosening due to external impact or temperature deformation, achieving a dual insurance mechanism of "mechanical self-locking + bolt tightening".

[0035] Working process: First, the bottom support steel 1 is positioned and fixed to the bottom of the pit or the existing support system. A fixing baffle 2 is pre-welded or assembled on its left side, and a slot 3 is provided below the slot. The bottom support steel 1 is initially positioned and limited by embedding into the slot 3, preventing lateral slippage.

[0036] Two longitudinal foundation pit support steels 4 are horizontally inserted into the grooves of the fixed baffle and mounting bracket 2 from the left and right sides respectively. The front end of the left longitudinal support steel 4 is equipped with a fixed baffle insert 5, which extends out after passing through the groove of the mounting bracket.

[0037] A fixed baffle limiting plate 6 is welded or bolted to the upper end of the fixed baffle insert 5, and a fixed baffle 7 is connected to the lower end of the node support steel to form upper and lower limits, constraining the vertical displacement of the longitudinal support steel 4. The baffle fixing screw 8 is passed through the center hole of the insert 5, and the baffle fixing nut 9 is tightened to make the insert plate and the card seat firmly locked, completing the rigid fixation of the left longitudinal support steel.

[0038] Install a node protective cover plate 10 on the outside of the right longitudinal support steel 4. After aligning the upper and lower ends of the cover plate with the support steel, insert the anti-loosening bolts 12. The anti-loosening bolts 12 simultaneously clamp the longitudinal support steel 4 and the cover plate 10, and achieve anti-loosening locking through the back plate embedded structure, thereby enhancing the overall stability and preventing the components from falling off.

[0039] A snap-fit ​​housing 13 is fixed to the top of the left longitudinal support steel 4, and a U-shaped locking groove 14 is welded on top of it. A reinforcing rib 15 is added between the two to improve bending stiffness. The top foundation pit support steel 16 is inserted into the U-shaped locking groove 14 from above, and the self-locking arc-shaped snap-fit ​​17 at its front end falls down and automatically snaps into the corresponding groove or limiting surface of the snap-fit ​​housing 13, forming a preliminary self-locking state. The self-locking snap-fit ​​fastening screw 18 is inserted to connect the snap-fit ​​housing 13 and the self-locking arc-shaped snap-fit ​​17, and then the self-locking snap-fit ​​fastening nut 19 is tightened to apply preload, so that the arc-shaped snap-fit ​​fits tightly with the housing, completing the final locking.

[0040] When the soil pressure on the side wall of the foundation pit acts on the support structure, the top foundation pit support steel 16 bears the axial pressure and transmits the force through the self-locking arc buckle 17 to the buckle housing 13, to the longitudinal support steel 4, to the fixed baffle insert 5, to the fixed baffle matching seat 2, to the bottom foundation pit support steel 1, and finally to the bottom of the foundation pit or the adjacent support system.

[0041] The U-shaped locking groove 14 and the reinforcing rib plate 15 together constrain the rotation and lateral displacement of the top support steel 16, effectively resisting bending moment. The fixed baffle limit plate 6 and the node support steel fixed baffle 7 restrict the vertical displacement of the longitudinal support steel 4, preventing the node from shifting under shear force. The anti-loosening bolt 12 and the node protective cover plate 10 work together to enhance the integrity of the right-side connection and share part of the shear force.

[0042] The self-locking arc-shaped buckle 17 tightens under pressure, and its arc-shaped structure generates a wedge-tightening effect; at the same time, the self-locking buckle fastening nut 19 provides continuous pre-tightening force, providing double protection to prevent the top support steel 16 from accidentally coming out during vibration, impact or unloading, and ensuring the long-term stability of the node.

[0043] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A foundation pit support steel support end connection node structure with self-locking buckle, comprising bottom foundation pit support steel (1), characterized in that, The bottom foundation pit support steel (1) is provided with a fixed baffle and a mounting bracket (2) on the left half. A mounting bracket groove (3) is installed below the fixed baffle and mounting bracket (2). The bottom foundation pit support steel (1) clamps the inside of the mounting bracket groove (3). A longitudinal foundation pit support steel (4) is inserted into the groove of the fixed baffle and mounting bracket (2). A fixed baffle insert (5) is provided at the front end of the longitudinal foundation pit support steel (4).

2. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 1, characterized in that, The fixed baffle is fixed with a fixed baffle limiting plate (6) on the front plate, and the bottom is connected to the node support steel fixed baffle (7).

3. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 2, characterized in that, A baffle fixing screw (8) is embedded in the center of the fixed baffle insert (5), and a baffle fixing nut (9) is provided on the baffle fixing screw (8).

4. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 3, characterized in that, Two longitudinal foundation pit support steels (4) are provided, and a node protection cover plate (10) is connected to the longitudinal foundation pit support steel (4) on the other side.

5. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 4, characterized in that, The node protective cover plate (10) is provided with anti-loosening bolts (12) at both the upper and lower ends, and the longitudinal foundation pit support steel (4) is clamped on the anti-loosening bolts (12), and anti-loosening bolts are embedded in the back plate.

6. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 5, characterized in that, The top of the longitudinal foundation pit support steel (4) on the left is fixed with a snap-fit ​​housing (13), and a U-shaped locking groove (14) is connected above the snap-fit ​​housing (13). A reinforcing rib plate (15) is installed between the snap-fit ​​housing (13) and the U-shaped locking groove (14).

7. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 6, characterized in that, The U-shaped locking groove (14) is provided with a top foundation pit support steel (16), and the front end of the top foundation pit support steel (16) is provided with a self-locking arc buckle (17).

8. The end connection node structure of the foundation pit support steel support with self-locking buckle according to claim 7, characterized in that, A self-locking buckle fastening screw (18) is connected between the buckle housing (13) and the self-locking arc buckle (17), and a self-locking buckle fastening nut (19) is provided on the outside of the self-locking buckle fastening screw (18).

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