A foundation pit support structure
By introducing an adjustable-length rotating rod structure into the foundation pit support device, the problem of mismatch between the foundation pit width and the rotating rod length is solved. This improves the adaptability of the foundation pit support device to foundation pits of different widths and enhances construction efficiency, ensuring the stability and safety of the foundation pit support structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZHAODING CONSTR CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-21
AI Technical Summary
The fixed length of the rotating rod in existing foundation pit support devices increases construction difficulty or results in poor support when facing foundation pits of different widths, failing to meet diverse construction needs.
A structure including an outer tube, an inner rod, a rotating cap, a first locking rod, a second locking rod, and ball bearings is designed. By pulling the handle, the movable plate is moved up, causing the locking rod to disengage from the locking groove. Rotating the rotating cap allows it to contact the ball bearings on the surface of the inner rod, thus achieving flexible adjustment of the length of the rotating rod. Combined with the cooperation of the slider and the slide groove, precise adjustment of the length of the rotating rod and multi-point locking are achieved.
The rotating rod length can be flexibly adjusted to adapt to different pit widths, improving the adaptability and construction efficiency of the pit support device, reducing the difficulty of operation and construction costs, and ensuring the stability and safety of the pit support structure.
Smart Images
Figure CN224531693U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of building construction technology, and in particular to a foundation pit support structure. Background Technology
[0002] As high-rise buildings become more numerous, the depth of foundation pits also increases. The excavated underground space can be used as garages, warehouses, shopping malls, civil defense projects, etc. After the foundation pit of a building is excavated, a support structure needs to be built around it to prevent local or large-scale collapses.
[0003] An existing patent (publication number: CN222575498U) discloses a foundation pit support system, including two symmetrically arranged support devices for ground fixing and close contact with the sides of the foundation pit. It also includes four pairs of sliding devices arranged opposite to the two support devices for vertical adjustment of the support position. A rotating device is installed between each pair of sliding devices for rotating to adjust the support angle and switching the support configuration. Each sliding device includes a slide rail, within which a slider is slidably installed, and a fixing plate is provided on the slider. This foundation pit support system, through the sliding adjustment of the support position and the rotating adjustment of the support angle, achieves dual-configuration switching between single-sided and double-sided support, meeting different support requirements.
[0004] In existing foundation pit support technologies, as disclosed in the aforementioned patent, the rotating rod mainly serves a supporting function during the foundation pit support process, but its length is fixed. When facing foundation pits of varying widths, the fixed-length rotating rod presents several limitations. If the foundation pit width is less than the rotating rod length, additional processing of the rotating rod is required during installation, increasing construction difficulty and cost. If the foundation pit width is greater than the rotating rod length, effective support for the sides of the foundation pit cannot be achieved, affecting the support effect and limiting the applicability of the foundation pit support device, making it difficult to meet diverse construction needs. Therefore, this paper provides a foundation pit support structure. Utility Model Content
[0005] The purpose of this application is to provide a foundation pit support structure with the feature of flexibly adjusting the length of the rotating rod.
[0006] This application provides a foundation pit support structure with the following technical solution: It includes two symmetrically arranged support devices for ground fixing and pushing support on the sides of the foundation pit; four pairs of sliding devices for vertical adjustment of the support position are arranged opposite the two support devices; rotating devices for adjusting the support angle and switching the support mode are installed between the pairs of sliding devices; the rotating rod of the rotating device includes an outer tube and an inner rod; two sets of inner rods are symmetrically and movably connected to the left and right ends of the outer tube; rotating caps are rotatably connected to the middle of both ends of the outer tube; the rotating... The upper surface of the rotating cap has a first through hole, and the surface of the inner rod has a second through hole. A first locking rod passes through the first and second through holes. The lower surface of the rotating cap has a locking groove. The lower end of the first locking rod passes through the locking groove. The upper end of the first locking rod is fixedly connected to a movable plate. A spring passes through the upper surface of the first locking rod. The upper end of the spring is fixedly connected to the lower surface of the movable plate. The lower end of the spring is fixedly connected to the upper surface of the rotating cap. A ball is rotatably connected to the lower end of the first locking rod. Multiple sets of the second through holes are provided and are evenly distributed on the surface of the inner rod. By adopting the above technical solution, an adjustable-length rotating rod system is constructed by setting up a series of structures including an outer tube, an inner rod, a rotating cap, a first locking rod, a second locking rod, and ball bearings. Pulling the handle moves the movable plate upward, causing the first and second locking rods to disengage from the locking groove and the second through hole, thus releasing the length lock. Rotating the rotating cap allows the ball bearings to contact the inner rod, and by pulling or pushing the inner rod, the length is adjusted using the cooperation of the slider and the sliding groove. This design breaks the limitation of the fixed length of the traditional rotating rod, allowing for flexible adjustment according to the actual width of the foundation pit. It effectively solves the construction problems caused by the mismatch between the rod length and the foundation pit width, significantly improving the adaptability of the foundation pit support device to foundation pits of different widths and meeting the needs of diverse construction scenarios.
[0007] Preferably, a second locking rod is fixedly connected to the lower surface of the movable plate. There are two sets of the second locking rod, which are symmetrically arranged on the left and right sides of the first locking rod. There are three sets of the first through hole and the locking groove, which are evenly opened on the upper surface of the rotating cap and the lower inner surface of the rotating cap. The second locking rod passes through the first through hole and the second through hole. The lower end of the second locking rod passes through the locking groove. A ball is rotatably connected to the lower end of the second locking rod.
[0008] By adopting the above technical solution, two sets of symmetrical second locking rods are added to the lower surface of the movable plate, working in conjunction with the first locking rod. Furthermore, the number of first through holes and locking slots is increased and evenly distributed. After the length of the rotating rod is adjusted, when the spring pushes the movable plate downwards, the first and second locking rods can be inserted more tightly and stably into the corresponding holes and slots, forming multi-point locking. Compared to a single locking rod structure, this enhances the reliability of the rotating rod length locking, effectively preventing changes in the rotating rod length even under complex stress conditions in the foundation pit, ensuring the stability and safety of the foundation pit support structure.
[0009] Preferably, a slider is fixedly connected to one end of the inner rod near the outer tube, and a groove is provided inside the outer tube, with the slider movably connected inside the groove.
[0010] By adopting the above technical solution, the slider at one end of the inner rod cooperates with the groove inside the outer tube, providing guidance and support for the sliding of the inner rod within the outer tube. During the adjustment of the rotating rod length, the slider slides smoothly within the groove, ensuring the linearity and stability of the inner rod's movement, preventing the inner rod from wobbling or shifting, making the rotating rod length adjustment operation smoother and more precise, and also enhancing the overall stability of the rotating rod structure.
[0011] Preferably, a handle is fixedly connected to the upper surface of the movable plate, and the surface of the handle is provided with an elastic protective layer.
[0012] By adopting the above technical solution, the handles on the movable plate are convenient for construction workers to operate. The elastic protective layer on the surface provides a comfortable grip for the construction workers' hands when the handle is pulled to adjust the length of the rotating rod, reducing hand fatigue. At the same time, the elastic protective layer has an anti-slip function, ensuring a reliable grip even if the construction workers' hands are sweaty or in a slippery environment, avoiding safety hazards caused by hand slippage during operation, and improving operational safety and comfort.
[0013] Preferably, the spring is made of an alloy material with high elasticity and corrosion resistance to ensure stable elastic deformation under frequent insertion and removal operations and improve service life.
[0014] By adopting the above technical solution, the spring is made of a high-elasticity, corrosion-resistant alloy material. When the first and second locking rods are frequently inserted and removed to adjust the length of the rotating rod, the spring can always maintain a stable elastic deformation capacity. It is not easy for the elasticity to decay or break. This ensures that the spring provides a stable elastic force to the movable plate for a long time, guarantees the reliable insertion and removal of the locking rod, extends the service life of the spring, and reduces the maintenance and replacement costs caused by spring failure.
[0015] Preferably, both the outer tube and the inner rod are made of high-strength, impact-resistant metal alloy materials to ensure the structural strength and stability of the rotating rod when supporting the foundation pit.
[0016] By adopting the above technical solution, the outer tube and inner rod are made of high-strength, impact-resistant metal alloy materials, giving the rotating rod excellent structural strength and toughness. During the foundation pit support process, when faced with complex external forces such as soil pressure and groundwater pressure on the pit sidewalls, the rotating rod can effectively resist deformation and damage, maintaining a stable support state and providing a solid guarantee for the safety of foundation pit construction. At the same time, the high-strength material also enhances the load-bearing capacity of the rotating rod, making it suitable for deeper and more complex foundation pit support projects.
[0017] Preferably, the first locking rod and the second locking rod are made of alloy steel with high hardness and strong wear resistance, which can effectively resist deformation and wear under external force and ensure the locking reliability after the length of the rotating rod is adjusted.
[0018] By adopting the above technical solution, the first and second locking rods are made of high-hardness, wear-resistant alloy steel, which can effectively resist deformation and wear during frequent insertion and removal and long-term bearing of external forces in the foundation pit support. Even after multiple length adjustment operations, the locking rod and the slot can still maintain good fit accuracy and locking effect, preventing the length of the rotating rod from loosening due to wear of the locking rod, ensuring the locking reliability after the length of the rotating rod is adjusted, and maintaining the stability of the foundation pit support structure.
[0019] Preferably, both the outer tube and the inner rod are treated with anti-corrosion coating. By applying an anti-corrosion coating or using a surface treatment process, the corrosion resistance of the material is enhanced, and the overall service life of the foundation pit support structure is extended.
[0020] By adopting the above technical solutions, the anti-corrosion treatment of the outer pipe and inner rod surfaces, through the application of anti-corrosion coatings or surface treatment processes, forms a dense protective layer on the material surface, effectively isolating corrosive substances in the foundation pit construction environment, such as groundwater and acidic or alkaline components in the soil. This not only extends the service life of the outer pipe and inner rod, reduces the risk of structural strength reduction and damage caused by corrosion, but also lowers the maintenance cost of the entire foundation pit support structure, ensuring that it maintains good working performance throughout long-term use.
[0021] In summary, this application includes at least one of the following beneficial technical effects: This foundation pit support structure incorporates an outer tube, inner rod, rotating cap, first locking rod, second locking rod, and ball bearings. The specific working process is as follows: pulling the handle moves the movable plate upwards, causing the first and second locking rods to disengage from the locking groove and second through hole, thus releasing the lock on the length of the rotating rod. Next, rotating the rotating cap causes the ball bearings to contact the surface of the inner rod. At this point, pulling or pushing multiple sets of inner rods allows the sliders on the inner rods to slide within the grooves, thereby adjusting the length of the rotating rod. This structural design overcomes the limitations of traditional fixed-length rotating rods, allowing the length to be flexibly adjusted according to the actual width of the foundation pit. This effectively solves the construction problems caused by the mismatch between the foundation pit width and the rotating rod length, significantly improving the adaptability of the foundation pit support device to foundation pits of different widths and meeting diverse construction needs. The rotating cap and ball bearings greatly optimize the adjustment operation. When adjusting the length of the rotating rod, rotating the rotating cap causes the ball bearings to roll and contact the surface of the inner rod. Compared to directly pulling the inner rod, this reduces friction during operation, making pulling or pushing the inner rod easier and less strenuous. At the same time, it eliminates the need to continuously pull the handle while pulling the inner rod, simplifying the operation process, improving construction efficiency, and reducing the labor intensity of construction workers. Attached Figure Description
[0022] Figure 1 This is a three-dimensional structural diagram of the present application. Figure 2 This is a partial cross-sectional structural schematic diagram of the rotating device in this application; Figure 3 This is a schematic diagram of the rotating cap structure of this application; Figure 4 for Figure 2 Schematic diagram of the structure at point A; Figure 5 for Figure 2 A schematic diagram of the structure at point B.
[0023] In the picture: 1. Support device; 2. Sliding device; 3. Rotating device; 301. Outer tube; 302. Inner rod; 303. Rotating cap; 304. First through hole; 305. Second through hole; 306. First locking rod; 307. Locking groove; 308. Spring; 309. Movable plate; 310. Handle; 311. Second locking rod; 312. Ball bearing; 313. Slider; 314. Slide groove. Detailed Implementation
[0024] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.
[0025] Example 1: A foundation pit support structure, referring to Figure 1 , Figure 2 and Figure 3The system includes two symmetrically arranged support devices 1 for fixing and pushing the sides of the foundation pit, four pairs of sliding devices 2 for adjusting the support position by sliding up and down, and rotating devices 3 for adjusting the support angle and switching the support mode between the pairs of sliding devices 2. The rotating rod of the rotating device 3 includes an outer tube 301 and an inner rod 302. There are two sets of inner rods 302, which are symmetrically and movably connected to the left and right ends of the outer tube 301. A rotating cap 303 is rotatably connected to the middle of the left and right ends of the outer tube 301. A first through hole 304 is opened on the upper surface of the rotating cap 303, and a second through hole 305 is opened on the surface of the inner rod 302. A first locking rod 30 is inserted inside the first through hole 304 and the second through hole 305. 6. A locking groove 307 is provided on the lower inner surface of the rotating cap 303. The lower end of the first locking rod 306 passes through the locking groove 307. The upper end of the first locking rod 306 is fixedly connected to a movable plate 309. A spring 308 passes through the upper surface of the first locking rod 306. The upper end of the spring 308 is fixedly connected to the lower surface of the movable plate 309. The lower end of the spring 308 is fixedly connected to the upper surface of the rotating cap 303. A ball bearing 312 is rotatably connected to the lower end of the first locking rod 306. Multiple sets of second through holes 305 are provided and are evenly opened on the surface of the inner rod 302. By setting a series of structures such as the outer tube 301, inner rod 302, rotating cap 303, first locking rod 306, second locking rod 311, and ball bearing 312, an adjustable length rotating rod system is constructed. Pulling handle 310 moves movable plate 309 upward, causing first locking rod 306 and second locking rod 311 to disengage from locking groove 307 and second through hole 305, thus releasing the length lock. Rotating rotating cap 303 allows ball bearing 312 to contact inner rod 302. By pulling or pushing inner rod 302, the length can be adjusted using the cooperation of slider 313 and sliding groove 314. This design breaks the limitation of fixed length of traditional rotating rods, allowing for flexible adjustment according to the actual width of the pit. It effectively solves the construction problems caused by the mismatch between rod length and pit width, significantly improving the adaptability of pit support devices to pits of different widths and meeting the needs of diverse construction scenarios.
[0026] Reference Figure 1 , Figure 4 and Figure 5The lower surface of the movable plate 309 is fixedly connected to a second locking rod 311. There are two sets of the second locking rod 311, which are symmetrically arranged on the left and right sides of the first locking rod 306. There are three sets of the first through hole 304 and the locking groove 307, which are evenly opened on the upper surface of the rotating cap 303 and the lower inner surface of the rotating cap 303. The second locking rod 311 passes through the first through hole 304 and the second through hole 305. The lower end of the second locking rod 311 passes through the locking groove 307. The lower end of the second locking rod 311 is rotatably connected to a ball bearing 312. The inner rod 302 is fixedly connected to a slider 313 on the surface near the outer tube 301. The outer tube 301 has a sliding groove 314. The slider 313 is movably connected in the sliding groove 314. Two sets of symmetrical second locking rods 311 are added to the lower surface of the movable plate 309 to work in conjunction with the first locking rod 306. The number of the first through hole 304 and the locking groove 307 are increased and evenly distributed. After the length of the rotating rod is adjusted, when the spring 308 pushes the movable plate 309 downward, the first locking rod 306 and the second locking rod 311 can be inserted more tightly and stably into the corresponding slots, forming a multi-point lock. Compared with the single locking rod structure, this enhances the reliability of the rotating rod length locking. Even in the complex stress environment of the foundation pit, it can effectively prevent changes in the length of the rotating rod, ensuring the stability and safety of the foundation pit support structure. The slider 313 at one end of the inner rod 302 cooperates with the sliding groove 314 in the outer tube 301, providing guidance and support for the sliding of the inner rod 302 in the outer tube 301. During the adjustment of the rotating rod length, the slider 313 slides smoothly in the sliding groove 314, ensuring the linearity and stability of the movement of the inner rod 302, preventing the inner rod 302 from shaking or deviating, making the rotating rod length adjustment operation smoother and more precise, and also enhancing the overall stability of the rotating rod structure.
[0027] Reference Figure 1 , Figure 2 and Figure 4A handle 310 is fixedly connected to the upper surface of the movable plate 309. The handle 310 has an elastic protective layer on its surface. The spring 308 is made of a highly elastic and corrosion-resistant alloy material to ensure stable elastic deformation under frequent insertion and removal operations, thus extending its service life. The handle 310 on the movable plate 309 facilitates operation by construction personnel. The elastic protective layer provides a comfortable grip for the construction personnel's hands when adjusting the length of the rotating rod by pulling the handle 310, reducing hand fatigue. Simultaneously, the elastic protective layer has an anti-slip function, even if the construction personnel's hands are sweaty or on a wet, slippery surface. The spring 308 is made of a highly elastic and corrosion-resistant alloy material. When frequently inserting and removing the first locking rod 306 and the second locking rod 311 to adjust the length of the rotating rod, it can always maintain a stable elastic deformation capacity and is not prone to elastic decay or breakage. This ensures that the spring 308 provides a stable elastic force to the movable plate 309 for a long time, ensuring reliable insertion and removal of the locking rod, extending the service life of the spring 308, and reducing maintenance and replacement costs caused by spring 308 failure.
[0028] Reference Figure 1 , Figure 2 and Figure 4Both the outer tube 301 and the inner rod 302 are made of high-strength, impact-resistant metal alloy materials, ensuring the structural strength and stability of the rotating rod when supporting the foundation pit. The first locking rod 306 and the second locking rod 311 are made of high-hardness, wear-resistant alloy steel materials, which can effectively resist deformation and wear under external forces and ensure the locking reliability after the length of the rotating rod is adjusted. The surfaces of the outer tube 301 and the inner rod 302 are treated with anti-corrosion coating. By coating with anti-corrosion coating or using surface treatment processes, the corrosion resistance of the materials is enhanced, and the overall service life of the foundation pit support structure is extended. The outer tube 301 and the inner rod 302 are made of high-strength, impact-resistant metal alloy materials, giving the rotating rod excellent structural strength and toughness. During the foundation pit support process, when faced with complex external forces such as soil pressure and groundwater pressure on the pit sidewalls, the rotating rod can effectively resist deformation and damage, maintaining a stable support state and providing a solid guarantee for the safety of foundation pit construction. Simultaneously, the high-strength material also enhances the load-bearing capacity of the rotating rod, making it suitable for deeper and more complex foundation pit support projects. The first locking rod 306 and the second locking rod 311 are made of high-hardness, wear-resistant alloy steel, effectively resisting deformation and wear during frequent insertion and removal and long-term bearing of external forces in the foundation pit support. Even after multiple length adjustments, the locking rod and the slot maintain good fit accuracy and locking effect, preventing loosening of the rotating rod length due to wear, ensuring the locking reliability after length adjustment, and maintaining the stability of the foundation pit support structure. The anti-corrosion treatment of the outer tube 301 and inner rod 302 involves coating with an anti-corrosion coating or using surface treatment processes to form a dense protective layer on the material surface, effectively isolating corrosive substances in the foundation pit construction environment, such as groundwater and acidic / alkaline components in the soil. This not only extends the service life of the outer tube 301 and the inner rod 302, reducing the risk of structural strength loss and damage caused by corrosion, but also reduces the maintenance cost of the entire foundation pit support structure, ensuring that it maintains good working performance throughout its long-term use.
[0029] In this embodiment, the structure includes an outer tube 301, an inner rod 302, a rotating cap 303, a first locking rod 306, a second locking rod 311, and a ball bearing 312. The specific working process is as follows: pulling the handle 310 moves the movable plate 309 upward, causing the first locking rod 306 and the second locking rod 311 to disengage from the locking groove 307 and the second through hole 305, thus releasing the lock on the length of the rotating rod. Next, rotating the rotating cap 303 causes the ball bearing 312 to contact the surface of the inner rod 302. At this time, by pulling or pushing multiple sets of inner rods 302, the slider 313 on the inner rod 302 can slide within the sliding groove 314, thereby achieving adjustment of the length of the rotating rod. This structural design overcomes the limitations of traditional fixed-length rotating rods, allowing the rod length to be flexibly adjusted according to the actual width of the excavation pit. This effectively solves the construction problems caused by a mismatch between the pit width and the rod length, significantly improving the adaptability of the excavation pit support device to pits of different widths and meeting diverse construction needs. The rotating cap 303 and the ball bearing 312 greatly optimize the adjustment operation. When adjusting the rod length, rotating the rotating cap 303 causes the ball bearing 312 to roll against the surface of the inner rod 302. Compared to directly pulling the inner rod 302, this reduces friction during operation, making pulling or pushing the inner rod 302 easier and less strenuous. Simultaneously, it eliminates the need to continuously pull the handle 310 while pulling the inner rod 302, simplifying the operation process, improving construction efficiency, and reducing the labor intensity of construction workers.
[0030] The implementation principle of this application embodiment is as follows: When it is necessary to adjust the length of the rotating rod according to the width of the foundation pit, the construction worker holds the handle 310 on the upper surface of the movable plate 309 and pulls it upward. Since the handle 310 is fixedly connected to the movable plate 309, the movable plate 309 drives the first locking rod 306 and the second locking rod 311 fixedly connected to it to move upward. At this time, the first locking rod 306 and the second locking rod 311 overcome the elastic force of the spring 308 and disengage from the locking groove 307 on the lower surface of the rotating cap 303 and the second through hole 305 on the surface of the inner rod 302, thereby releasing the locking restriction on the length of the rotating rod; after the lock is released, the rotating caps 303 at the left and right ends of the outer tube 301 are rotated so that the ball bearings 312 at the lower end of the rotating cap 303 contact the surface of the inner rod 302. Since the slider 313, which is fixedly connected to the surface of the inner rod 302 near the outer tube 301, can slide within the groove 314 opened inside the corresponding outer tube 301, construction personnel can adjust the extension length of the inner rod 302 within the outer tube 301 according to the actual width of the foundation pit by pulling or pushing the inner rod 302, thereby adjusting the overall length of the rotating rod. During the adjustment process, the ball bearing 312 rolls against the surface of the inner rod 302, effectively reducing friction during adjustment and making the operation easier and smoother. After the length of the rotating rod is adjusted, the rotating cap 303 rotates to its original position, and the handle 310 is released. Under the action of its own elastic deformation restoring force, the spring 308 pushes the movable plate 309 downward. The movable plate 309 drives the first locking rod 306 and the second locking rod 311 to move downward, so that they are re-inserted into the corresponding locking groove 307 and the second through hole 305. Because the first locking rod 306 and the second locking rod 311 are made of high-hardness, wear-resistant alloy steel and fit tightly with the locking groove 307 and the second through hole 305, they can firmly lock the adjusted length of the rotating rod, ensuring that the rotating rod remains stable during the foundation pit support process and providing reliable support for the side of the foundation pit. The outer tube 301 and the inner rod 302 are made of high-strength, impact-resistant metal alloy materials and have been treated with anti-corrosion coating. The spring 308 is made of high-elasticity, corrosion-resistant alloy material, which ensures that the entire foundation pit support structure can work stably for a long time in complex construction environments and extends its service life.
[0031] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A foundation pit support structure, comprising two symmetrically arranged support devices (1) for inserting into the ground for fixing and pushing support on the sides of the foundation pit, four pairs of sliding devices (2) arranged opposite to the two support devices (1) for adjusting the support position by sliding up and down, and a rotating device (3) installed between the pairs of sliding devices (2) for rotating to adjust the support angle and rotating to switch the support form, characterized in that: The rotating rod of the rotating device (3) includes an outer tube (301) and an inner rod (302). There are two sets of inner rods (302), which are symmetrically and movably connected to the left and right ends of the outer tube (301). A rotating cap (303) is rotatably connected to the middle of the left and right ends of the outer tube (301). A first through hole (304) is opened on the upper surface of the rotating cap (303), and a second through hole (305) is opened on the surface of the inner rod (302). A first locking rod (306) passes through the first through hole (304) and the second through hole (305). A locking groove is opened on the lower surface of the inner surface of the rotating cap (303). (307), the lower end of the first locking rod (306) passes through the inside of the locking groove (307), the upper end of the first locking rod (306) is fixedly connected to the movable plate (309), the upper surface of the first locking rod (306) is provided with a spring (308), the upper end of the spring (308) is fixedly connected to the lower surface of the movable plate (309), the lower end of the spring (308) is fixedly connected to the upper surface of the rotating cap (303), the lower end of the first locking rod (306) is rotatably connected with a ball (312), and multiple sets of the second through holes (305) are provided and are evenly opened on the surface of the inner rod (302).
2. The foundation pit support structure according to claim 1, characterized in that: The lower surface of the movable plate (309) is fixedly connected to a second locking rod (311). There are two sets of the second locking rod (311), which are symmetrically arranged on the left and right sides of the first locking rod (306). There are three sets of the first through hole (304) and the locking groove (307), which are evenly opened on the upper surface of the rotating cap (303) and the lower surface inside the rotating cap (303). The second locking rod (311) passes through the first through hole (304) and the second through hole (305). The lower end of the second locking rod (311) passes through the locking groove (307). The lower end of the second locking rod (311) is rotatably connected to a ball bearing (312).
3. The foundation pit support structure according to claim 1, characterized in that: The inner rod (302) is fixedly connected to a slider (313) on one end surface near the outer tube (301). The outer tube (301) has a groove (314) inside, and the slider (313) is movably connected inside the groove (314).
4. The foundation pit support structure according to claim 1, characterized in that: A handle (310) is fixedly connected to the upper surface of the movable plate (309), and an elastic protective layer is provided on the surface of the handle (310).
5. The foundation pit support structure according to claim 1, characterized in that: The spring (308) is made of an alloy material with high elasticity and corrosion resistance to ensure stable elastic deformation under frequent insertion and removal operations and improve service life.
6. The foundation pit support structure according to claim 1, characterized in that: Both the outer tube (301) and the inner rod (302) are made of high-strength, impact-resistant metal alloy materials to ensure the structural strength and stability of the rotating rod when supporting the foundation pit.
7. The foundation pit support structure according to claim 2, characterized in that: The first locking rod (306) and the second locking rod (311) are made of alloy steel with high hardness and strong wear resistance, which can effectively resist deformation and wear under external force and ensure the locking reliability after the length of the rotating rod is adjusted.
8. The foundation pit support structure according to claim 1, characterized in that: The outer tube (301) and inner rod (302) are both treated with anti-corrosion coating. By applying anti-corrosion coating or using surface treatment process, the corrosion resistance of the material is enhanced and the overall service life of the foundation pit support structure is extended.