Supporting device for deep foundation pit

Abstract

The utility model relates to the technical field of supporting device, disclose a supporting device for deep foundation pit, including the support pile of fixed in the bottom of foundation pit and set up in the support board of foundation pit side wall, the support board is fixed in the side wall of foundation pit through the locating seat, and the inside of support board is spaced and is fixed with the upper ear plate and lower ear plate of same design, the device still includes the support rod one of horizontal arrangement and the support rod two of inclined arrangement, one end of support rod one is hinged with upper ear plate, and the other end is detachably connected with support pile, one end of support rod two is hinged with lower ear plate, and the other end is fixed in the bottom surface of foundation pit through the locating plate, the utility model discloses a double supporting system that combines horizontally and obliquely, forms the stable stress structure, and the length of support rod is adjustable, and the support board unitization installs, and the adaptability, safety and construction efficiency of support engineering have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of support device technology, specifically a support device for deep foundation pits. Background Technology

[0002] With the rapid pace of urbanization, numerous high-rise buildings, underground rail transit systems, and underground parking facilities are emerging. Deep foundation pit engineering, as a fundamental component of these projects, is of paramount importance in terms of construction quality and safety. During the excavation of a deep foundation pit, the original stress balance of the surrounding soil is disrupted, leading to lateral displacement and settlement within the pit. Without timely and effective support measures, this can easily trigger a series of serious accidents, including pit collapse, tilting and cracking of surrounding buildings, and damage to underground pipelines. These incidents not only cause enormous economic losses but also threaten the lives of construction workers.

[0003] Currently, there are many types of deep foundation pit support devices on the market, but they generally have some shortcomings. Some support devices have complex structures, consisting of a large number of parts, which not only increases manufacturing costs but also requires a lot of manpower and time during installation and dismantling, resulting in low construction efficiency. For example, some support structures using multi-layer steel plates and complex connectors require precise alignment of various components during installation, which demands high operational skills from construction personnel. Slight carelessness may lead to installation deviations, affecting the support effect.

[0004] Furthermore, the support effectiveness of existing support devices needs improvement. Some devices are prone to deformation and displacement when subjected to lateral soil pressure, failing to provide reliable support for the foundation pit. This is especially true in cases of deep foundation pits with significant excavation depth and complex surrounding environments, where existing support devices often fall short of the project's safety requirements. For example, in some deep foundation pit projects near existing buildings, insufficient rigidity and strength of the support devices may lead to uneven settlement of surrounding buildings, affecting their normal use and structural safety.

[0005] Therefore, developing a support device for deep foundation pits that is simple in structure, easy to install and disassemble, highly adaptable, and provides good support effect is of great practical significance. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide a support device for deep foundation pits.

[0007] To solve the above problems, the technical solution of this utility model is: a support device for deep foundation pits, including support piles fixed to the bottom of the foundation pit and support plates set on the sidewalls of the foundation pit;

[0008] The support plate is fixed to the side wall of the pit by positioning seats, and the inner side of the support plate is fixed with upper and lower ear plates of the same design at intervals.

[0009] The device also includes a horizontally arranged support rod one and an inclined support rod two. One end of the support rod one is hinged to the upper ear plate, and the other end is detachably connected to the support pile. One end of the support rod two is hinged to the lower ear plate, and the other end is fixed to the bottom of the pit by a positioning plate.

[0010] Furthermore, the positioning seat is embedded in the side wall of the pit and fixed to the side wall of the pit by positioning nails. Positioning holes are provided at the four corners of the support plate, and bolts connected to the positioning seat are installed in the positioning holes.

[0011] Furthermore, two vertical rods are fixedly connected to the inner edge of the support plate, and multiple horizontal rods are fixedly connected between the two vertical rods. The upper ear plate and the lower ear plate are fixedly connected to the vertical rods.

[0012] Furthermore, the outer side of the support plate is provided with anti-slip protrusions, which are in the form of uniformly distributed strips.

[0013] Furthermore, both the first and second support rods are hinged to a connecting seat at their ends. The connecting seat has at least one groove for mounting the upper / lower ear plate. The upper ear plate, lower ear plate, and connecting seat have corresponding through holes, and a pin is installed through the through hole.

[0014] Furthermore, the first support rod is a telescopic rod structure, including an inner tube and an outer tube sleeved outside the inner tube. The outer tube is provided with locking bolts for locking the inner tube. One end of the first support rod connected to the support pile is fixed with a U-shaped clamp, and the U-shaped clamp is fastened to the support pile by bolts and nuts.

[0015] Furthermore, the second support rod is hinged to the positioning plate, and the positioning plate is fixed to the bottom of the pit by ground nails.

[0016] The advantages of this invention compared to existing technologies are as follows:

[0017] 1. The support plate is pre-positioned by the positioning seat, and the support rod is connected by hinges and clamps, realizing fully prefabricated construction and greatly shortening the construction period.

[0018] 2. The horizontal support rod one and the diagonal support rod two work together to form a more stable stress structure, which can effectively resist the soil pressure on the pit wall and improve the support effect.

[0019] 3. The length of the support rod is adjustable, and the preload can be adjusted in a timely manner according to the deformation monitoring data of the foundation pit, so as to adapt to the dynamic construction process of the foundation pit and improve the safety of the support.

[0020] 4. The components are robustly designed, with reliable connections, and are recyclable and reusable, reducing engineering costs and improving safety. Attached Figure Description

[0021] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 .

[0022] Figure 2 This is a three-dimensional representation of the present invention. Figure 2 .

[0023] Figure 3 This is a connection structure diagram of the support rod of this utility model.

[0024] Figure 4 This is a connection structure diagram of the support rod 2 of this utility model.

[0025] Figure 5 This is a structural diagram of the positioning seat of this utility model.

[0026] As shown in the figure: 1. Support pile; 2. Support plate; 3. Positioning seat; 4. Upper ear plate; 5. Lower ear plate; 6. Support rod one; 6.1. Inner tube; 6.2. Outer tube; 7. Support rod two; 8. Positioning plate; 9. Positioning nail; 10. Vertical rod; 11. Horizontal rod; 12. Anti-slip protrusion; 13. Connecting seat; 14. U-shaped clamp; 15. Ground nail. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] like Figure 1 , Figure 2 and Figure 5 As shown, the present invention provides a support device for deep foundation pits, which adopts modular support plates and a dual support system combining horizontal and inclined directions to achieve rapid assembly, flexible adjustment and stable reliability of the support structure.

[0029] The support plate 2 is a bearing member that directly acts on the soil of the foundation pit sidewall, and its installation method achieves rapid and standardized operation.

[0030] Positioning and Anchoring: First, on the soil of the pit sidewall, according to the design spacing and elevation, a shallow pit is chiseled or dug to accommodate the positioning seat 3. The positioning seat 3 is usually a heavy steel plate or cast steel block with internal threaded holes. After the positioning seat 3 is placed in the shallow pit, one or more positioning nails 9 (e.g., steel chisels or threaded steel bars with a pointed end) are passed through the pre-set holes on the positioning seat 3 and forcefully driven into the deep soil with a sledgehammer, thereby firmly embedding the positioning seat 3 in the designated position on the pit wall.

[0031] Modular mounting: The support plate 2 is typically a rectangular steel plate with positioning holes at its four corners. During installation, simply attach the support plate 2 to the side wall of the pit, aligning its positioning holes with the pre-embedded positioning seats 3. Then, use high-strength bolts to pass through the positioning holes and screw them into the internal threads of the positioning seats 3 to quickly and accurately fix the support plate 2. This design enables modular installation of the support plate, facilitating construction and subsequent disassembly and reuse.

[0032] Structural reinforcement: To enhance the rigidity and bending resistance of the support plate 2 and prevent excessive deformation under earth pressure, a reinforcing frame is welded to the inner side (the side facing away from the soil) of the support plate 2. This frame is typically welded together from two vertical bars 10 and several horizontal bars 11, forming a robust grid support structure.

[0033] Anti-slip design: On the outer side (soil-contacting surface) of the support plate 2, uniformly distributed strip-shaped anti-slip protrusions 12 are processed or welded. These protrusions can significantly increase the static friction between the support plate 2 and the soil, effectively preventing the support plate from sliding downwards after being subjected to force, and enhancing the overall stability of the support system.

[0034] like Figure 1 and Figure 3 As shown, the horizontal support system (support rod 6) is connected as follows: An upper ear plate 4 is welded to the upper part of the reinforcing frame of the support plate 2. The support rod 6 adopts a telescopic rod structure, consisting of an inner tube 6.1 and an outer tube 6.2 stacked together. The length is adjusted and locked by locking bolts. One end of the support rod 6 near the support plate 2 is hinged to the upper ear plate 4 via a connecting seat 13. Specifically, the connecting seat 13 has a U-shaped groove that fits into the upper ear plate 4. Aligning the through holes on both, a pin is inserted to form a hinged connection, allowing the support rod 6 to deflect to a certain extent under stress, avoiding rigid constraints and excessive secondary stress.

[0035] The other end of the support rod 6 is connected to the support pile 1 (such as steel pipe pile, precast concrete pile, etc.) pre-driven into the bottom of the foundation pit via a U-shaped clamp 14. During installation, the U-shaped clamp 14 is clamped onto the support pile 1, and then tightened with high-strength bolts and nuts; this connection method is extremely convenient for assembly and disassembly, and is conducive to material recycling.

[0036] like Figure 1and Figure 4 As shown, the connection of the inclined support system (support rod 2 7) is as follows: a lower ear plate 5 is welded to the lower part of the reinforcing frame of the support plate 2. One end of the support rod 2 7 is also hinged to the lower ear plate 5 through the connecting seat 13 and the pin. The other end of the support rod 2 7 is hinged to a positioning plate 8. The positioning plate 8 is placed flat on the bottom of the foundation pit and is driven or pressed into the foundation soil by several ground nails 15 (such as long nails, anchor rods, etc.), thereby firmly anchoring the bottom end of the positioning plate 8 and the support rod 2 7 connected to it.

[0037] In practical use, the support piles 1 are constructed according to the design. As the foundation pit is excavated in layers, support is carried out layer by layer. On the newly excavated pit wall soil layer, positioning seats 3 are pre-embedded and fixed at the design intervals, and then the support plate 2 is hung and fixed. First, support rod 7 is installed, and its upper and lower ends are respectively hinged to the lower ear plate 5 and the positioning plate 8. Then, support rod 6 is installed, and after it is adjusted to a suitable length, its two ends are respectively connected and tightened to the upper ear plate 4 and the support pile 1. By adjusting the extension length of support rod 6, a certain pre-tightening force can be applied to it, so that the support plate 2 is tightly attached to the pit wall, and it is in an effective working state in the initial state.

[0038] When the soil in the pit wall deforms and generates earth pressure, the force is first transmitted to the support plate 2. The support plate 2 then transmits the horizontal force to support rod 6 and support rod 7 respectively. Support rod 6 directly transmits most of the horizontal force to the solid support pile 1. Support rod 7, acting as a diagonal brace, decomposes part of the horizontal force into axial force along the direction of the rod, and finally transmits the force to the bottom of the pit anchored by the positioning plate 8 and the ground nail 15. Together, they form a stable statically determinate or statically indeterminate support structure, effectively constraining the deformation of the pit wall.

[0039] This utility model, through the aforementioned modular design and dual support system, achieves safe, efficient, and adjustable deep foundation pit support, and has significant practical value.

[0040] The parts not disclosed in this utility model are all prior art, and their specific structures and working principles will not be described in detail.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover 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 process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A support device for deep foundation pits, comprising support piles (1) fixed to the bottom of the foundation pit and support plates (2) disposed on the sidewalls of the foundation pit, characterized in that: The support plate (2) is fixed to the side wall of the pit by the positioning seat (3), and the inner side of the support plate (2) is fixed with an upper ear plate (4) and a lower ear plate (5) with the same design at intervals. The device also includes a horizontally arranged support rod one (6) and an inclined support rod two (7). One end of the support rod one (6) is hinged to the upper ear plate (4), and the other end is detachably connected to the support pile (1). One end of the support rod two (7) is hinged to the lower ear plate (5), and the other end is fixed to the bottom of the pit by a positioning plate (8).

2. The support device for deep foundation pits according to claim 1, characterized in that: The positioning seat (3) is embedded in the side wall of the pit and fixed to the side wall of the pit by positioning nails (9). Positioning holes are provided at the four corners of the support plate (2), and bolts connected to the positioning seat (3) are installed in the positioning holes.

3. The support device for deep foundation pits according to claim 1, characterized in that: Two vertical rods (10) are fixed to the inner edge of the support plate (2), and multiple horizontal rods (11) are fixed between the two vertical rods (10). The upper ear plate (4) and the lower ear plate (5) are fixed to the vertical rods (10).

4. The support device for deep foundation pits according to claim 1, characterized in that: The outer side of the support plate (2) is provided with anti-slip protrusions (12), which are in the form of uniformly distributed strips.

5. A support device for deep foundation pits according to claim 1, characterized in that: Both the first support rod (6) and the second support rod (7) are hinged to a connecting seat (13). The connecting seat (13) has at least one groove for installing the upper ear plate (4) / lower ear plate (5). The upper ear plate (4), the lower ear plate (5) and the connecting seat (13) have corresponding through holes. A pin is installed through the through hole.

6. A support device for deep foundation pits according to claim 5, characterized in that: The support rod (6) is a telescopic rod structure, including an inner tube (6.1) and an outer tube (6.2) sleeved outside the inner tube (6.1). The outer tube (6.2) is provided with locking bolts for locking the inner tube (6.1). One end of the support rod (6) connected to the support pile (1) is fixed with a U-shaped clamp (14). The U-shaped clamp (14) is fastened to the support pile (1) by bolts and nuts.

7. A support device for deep foundation pits according to claim 5, characterized in that: The second support rod (7) is hinged to the positioning plate (8), and the positioning plate (8) is fixed to the bottom of the pit by ground nails (15).

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