Foundation pit supporting device

Abstract

The invention relates to the technical field of building construction, in particular to reinforcement design of a foundation pit. The foundation pit supporting device comprises a plurality of supporting plate assemblies distributed in the circumferential direction of a foundation pit, and each supporting plate assembly comprises a supporting plate, a plurality of supporting plates and a plurality of supporting plates, the steel purline reinforcing assembly comprises a fixed shell embedded in the mounting groove; the transmission mechanism is assembled in the fixed shell; the telescopic supporting rod is driven by a transmission mechanism to do telescopic motion on the two sides of the fixed shell; the inserting and fixing assemblies are used for connecting the ends of the telescopic supporting rods of the adjacent supporting plate assemblies; the top reinforcing mechanism is arranged on the two sides of the top end of the supporting plate and comprises a reinforcing rod vertically arranged in the supporting plate in a penetrating mode. The anchoring assembly comprises a reinforcing shell connected with the top end of the reinforcing rod and a reinforcing cone arranged in the reinforcing shell.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to the reinforcement design of foundation pits. Background Art

[0002] In the field of construction engineering, foundation pit construction is a common and crucial link. To ensure the safety and stability during the excavation of foundation pits and prevent the surrounding soil from collapsing, foundation pit support structures have emerged. With the acceleration of urbanization and the continuous emergence of various construction projects, the scale of foundation pit projects is increasing day by day, and the geological conditions are becoming more and more complex, which puts forward higher requirements for foundation pit support technologies. Foundation pit support is not only related to the smooth progress of the project itself, but also closely related to the safety of the surrounding environment and personnel. Therefore, the research and development of efficient and reliable foundation pit support structures has always been an important topic in the construction industry.

[0003] The Chinese patent document with the publication number CN111218940A discloses a lattice-shaped steel combined support system. In this technical solution, a plurality of support plates are arranged around the inside of the foundation pit, a connection assembly including a first pile body and a connection block with a hinged end is arranged between adjacent support plates, a second pile body with a fixed interval is arranged between adjacent first pile bodies, the support plate is sleeved on the second pile body, the connection block is sleeved on the first pile body and hinges adjacent support plates, and at the same time, the structures such as the connection block and the pile body are arranged and optimized at multiple levels, solving the problems of connection and stable support between adjacent support plates in the foundation pit support structure, and enhancing the integrity and adaptability of the support structure.

[0004] However, there are many defects in this existing foundation pit support structure construction technology. On the one hand, the on-site construction and assembly process is cumbersome, involving the installation and connection of a large number of components, which requires a lot of time and manpower, resulting in low construction efficiency, prolonging the project cycle, and increasing the construction cost. On the other hand, during the process of unloading pressure release of the soil around the foundation pit support structure, the force borne by the steel waling installed on the upper side of the inner wall of the foundation pit support structure is significantly greater than that on the lower side. During long-term foundation pit excavation construction activities, the upper steel waling may be deformed due to excessive pressure, and then the side foundation pit support plates supported by it may tilt, seriously affecting the stability and protection effect of the foundation pit support structure, and bringing potential threats to project safety. Summary of the Invention

[0005] In order to overcome the above defects in the prior art, a foundation pit support device is provided.

[0006] The present invention is achieved through the following technical solutions: A foundation pit support device includes a plurality of support plate assemblies arranged circumferentially along the foundation pit. Each support plate assembly includes: a support plate with an installation groove provided on its inner wall; a steel fender reinforcement assembly, including: a fixed shell embedded in the installation groove; a transmission mechanism assembled in the fixed shell; a telescopic support rod driven by the transmission mechanism to perform telescopic movement on both sides of the fixed shell; a plug-in fixing component for connecting the ends of the telescopic support rods of adjacent support plate assemblies; a top reinforcement mechanism provided on both sides of the top end of the support plate, including: a reinforcement rod vertically penetrating through the support plate; an anchoring component including a reinforcement outer shell connected to the top end of the reinforcement rod and a reinforcement cone built in the reinforcement outer shell.

[0007] As a preferred embodiment of the present invention, a lower pressing plate is provided on the upper end surface of the reinforcement cone, and the lower pressing plate is movably installed on the upper end surface of the reinforcement outer shell; the reinforcement cone moves downward with the lower pressing plate and inserts into the ground.

[0008] As a preferred embodiment of the present invention, a guide rod and a spring are provided between the reinforcement outer shell and the lower pressing plate; the spring is sleeved outside the guide rod, its upper end is connected to the lower end surface of the lower pressing plate, and the lower end is fixed to the reinforcement outer shell; the spring provides a reset elastic force for the lower pressing plate.

[0009] As a preferred embodiment of the present invention, a transverse anchoring component and a lower pressing handle are provided inside the reinforcement cone; the transverse anchoring component is slidably assembled in the inner cavity of the reinforcement cone, and the lower pressing handle passes through the lower pressing plate and abuts against the transverse anchoring component for driving the transverse anchoring component to expand and contract laterally.

[0010] As a preferred embodiment of the present invention, the transverse anchoring component includes a transverse insertion rod, a abutting block, and a reset component. The abutting block and the reset component are respectively fixed to the upper end surface and the lower end surface of the transverse insertion rod. The reset component is used to provide an axial elastic reset force for the transverse insertion rod. An inclined abutting surface for mutual cooperation is provided between the abutting block and the end of the lower pressing handle; the transverse insertion rod is slidably assembled inside the reinforcement cone.

[0011] As a preferred embodiment of the present invention, the reset component includes a fixed rod and a reset spring sleeved on the fixed rod. One end of the fixed rod is movably inserted into the inner wall of the reinforcement cone, and the other end is fixed to the transverse insertion rod; both ends of the reset spring abut against the inner wall of the reinforcement cone and the end of the transverse insertion rod.

[0012] As a preferred embodiment of the present invention, the cross-sectional dimension of the end of the transverse insertion rod away from the inner side of the reinforcement cone gradually decreases along the axial direction.

[0013] As a preferred embodiment of the present invention, the transmission mechanism includes a stepping motor provided in the fixed shell, a transmission rotating shaft connected to the stepping motor, a first bevel gear sleeved on the transmission rotating shaft, and a second bevel gear meshing with it. The second bevel gear drives the telescopic support rod to expand and contract synchronously along both sides of the fixed shell through a transmission rod assembly.

[0014] As a preferred embodiment of the present invention, the transmission rod assembly includes an internally threaded sleeve, a threaded rod, and a rotating shaft. The threaded rod is fixedly connected to the rotating shaft, and the internally threaded sleeve is threadedly connected to the threaded rod; the internally threaded sleeve is fixed to the upper end of the telescopic support rod, and the second bevel gear drives the rotating shaft to drive the threaded rod to rotate, so that the internally threaded sleeve moves along the axial direction of the threaded rod.

[0015] As a preferred embodiment of the present invention, the plug-in fixing assembly includes a connecting plate and a plurality of connecting rods fixed to the lower end of the connecting plate. The plurality of connecting rods are respectively inserted into through holes opened at the ends of adjacent telescopic support rods.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The overall structure of a foundation pit support device has strong stability. The telescopic support rods of the steel waling reinforcement assembly can be telescopically assembled inside the support plate, improving the assembly efficiency, shortening the project cycle, and reducing the construction cost; the top reinforcement mechanism enhances the lateral pressure resistance of the support plate and improves the support strength of the foundation pit support device.

[0017] Furthermore, the anchoring operation process is simplified. The lower pressing plate provides a stable force application point, ensuring that the reinforcement cone vertically penetrates into the formation, avoiding deviation, and improving the anchoring reliability.

[0018] Furthermore, the guiding rod ensures that the reinforcement cone is vertically inserted downward, and the spring prevents the reinforcement cone from being inserted into the muddy ground in advance, avoiding the need to pull out the reinforcement cone and re-fix it when adjusting the angle of the top reinforcement mechanism, thus improving the construction efficiency.

[0019] Furthermore, the lateral anchoring assembly significantly enhances the uplift resistance of the reinforcement cone, improves the overall stability of the device, helps the foundation pit support structure to resist external soil pressure and other possible loads, and prevents the structure at the upper end of the inner wall of the foundation pit support structure from deforming or becoming unstable due to excessive pressure.

[0020] Furthermore, the structure of the lateral anchoring assembly is simple. The lateral insertion rod can be controlled to move by pressing the handle in cooperation with the reset assembly. The installation and disassembly are simple, reducing manual operation and ensuring the reusability of the anchoring assembly.

[0021] Furthermore, the fixed rod ensures that the lateral insertion rod moves in a straight line, and the reset spring extends the service life of the assembly, avoiding jamming of the lateral insertion rod and improving the accuracy of the anchoring action.

[0022] Furthermore, the tapered end of the lateral insertion rod is more likely to penetrate the soil layer, reducing the risk of deformation of the insertion rod, and at the same time increasing the contact area with the soil, enhancing the lateral anchoring strength.

[0023] Furthermore, the motor drive enables precise control, resulting in higher assembly efficiency. The bevel gear ensures efficient power transmission, and the synchronous movement of the telescopic rods on both sides avoids uneven stress on the support plate.

[0024] Furthermore, the screw drive has a simple and reliable structure, high adjustment precision, is convenient for controlling the telescopic amount, and has a self-locking function to prevent the telescopic support rod from retracting.

[0025] Furthermore, the plug-in connection is fast and convenient. The multiple connecting rods disperse the stress, avoid single-point failure, and enhance the continuity and shear strength of the overall support structure.

[0026] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the drawings: Figure 1 is an exploded view of a foundation pit support device of the present invention; Figure 2 is an exploded view of the flipped foundation pit support device of the present invention; Figure 3 is of the present invention Figure 1 magnified structural view of part A; Figure 4 is of the present invention Figure 1 magnified structural view of part B; Figure 5 is a cross-sectional view of a foundation pit support device of the present invention; Figure 6 is of the present invention Figure 5 magnified structural view of part C; Figure 7 is of the present invention Figure 5 magnified structural view of part D; Figure 8 is an enlarged structural view of the reset component of the present invention; The reference numerals are explained as follows: Support plate assembly 1, support plate 2, installation groove 200, connection through-hole 201, positioning groove 202, steel waling reinforcement assembly 3, fixed housing 31, transmission mechanism 32, stepper motor 321, transmission rotating shaft 322, first bevel gear 323, second bevel gear 324, transmission rod assembly 325, internal thread sleeve 3251, threaded rod 3252, rotating shaft 3253, telescopic support rod 33, through-hole 331, plug-in fixing assembly 34, connecting plate 341, connecting rod 342, top reinforcement mechanism 4, reinforcement rod 41, anchoring assembly 42, reinforcement housing 411, reinforcement cone 412, guiding hole 4120, lower pressing plate 4121, guiding rod 413, spring 414, lateral anchoring assembly 415, lateral insertion rod 4151, abutting block 4152, reset assembly 4153, fixed rod 4153-1, reset spring 4153-2, lower pressing handle 416, inclined surface structure 4161, suspension rod 5, control panel 6. Detailed implementation manners

[0028] The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0029] In the following description, terms such as "inner", "outer", "upper", "lower", "left", "right", etc. indicating directions or positional relationships are only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus cannot be construed as a limitation of the present invention.

[0030] As Figures 1 to 8 shown, a foundation pit support device includes a plurality of support plate assemblies 1 arranged along the circumference of the foundation pit. Each support plate assembly 1 is composed of a support plate 2, a steel waling reinforcement assembly 3, and a top reinforcement mechanism 4.

[0031] The support plate 2 is one of the main structures of the foundation pit support device. An installation groove 20 is provided on its inner wall for installing the steel waling reinforcement assembly 3, providing a basic support framework for the entire support device and ensuring that the device can be stably arranged around the foundation pit. The steel waling reinforcement assembly 3 includes a fixed housing 31, a transmission mechanism 32, a telescopic support rod 33, and a plug-in fixing assembly 34.

[0032] The fixed housing 31 is embedded in the installation groove 20 on the inner wall of the support plate 2, playing a role in fixing and supporting the internal transmission mechanism 32 and the telescopic support rod 33, and providing a stable installation foundation for the entire steel waling reinforcement assembly 3.

[0033] The transmission mechanism 32 is assembled inside the fixed housing 31 and consists of a stepper motor 321, a transmission rotating shaft 322, a first bevel gear 323, a second bevel gear 324, and a transmission rod assembly 325. The stepper motor 321 serves as the power source and transmits power to the first bevel gear 323 through the transmission rotating shaft 322. The first bevel gear 323 meshes with the second bevel gear 324, changes the direction of the power, and then transmits it to the transmission rod assembly 325. The transmission rod assembly 325 includes an internal thread sleeve 3251, a threaded rod 3252, and a rotating shaft 3253. The threaded rod 3252 is fixedly connected to the rotating shaft 3253. The internal thread sleeve 3251 is threadedly connected to the threaded rod 3252 and is fixed to the upper end of the telescopic support rod 33. The second bevel gear 324 drives the rotating shaft 3253 to drive the threaded rod 3252 to rotate, causing the internal thread sleeve 3251 to move axially along the threaded rod 3252, thereby realizing the synchronous telescopic movement of the telescopic support rod 33 on both sides of the fixed housing 31. This transmission mechanism 32 realizes precise control through motor drive, making the assembly efficiency higher. The bevel gears ensure efficient power transmission, and the synchronous movement of the telescopic rods on both sides avoids uneven force on the support plate 2. A control panel 6 electrically connected to the transmission mechanism 32 is also provided on the fixed housing 31, and the control panel 6 can control the telescopic movement of the telescopic support rod 33.

[0034] The telescopic support rod 33 is driven by the transmission mechanism 32 to perform telescopic movement on both sides of the fixed housing 31. It can be telescopically assembled inside the support plate 2, improving the assembly efficiency. During the foundation pit support process, it can adjust the length according to actual needs and provide a stable support force for the support plate 2.

[0035] The plug-in fixing component 34 includes a connecting plate 341 and a plurality of connecting rods 342 fixed to the lower end of the connecting plate 341. The plurality of connecting rods 342 are respectively inserted into through holes 331 opened at the ends of adjacent telescopic support rods 33, used to connect the ends of the telescopic support rods 33 of adjacent support plate assemblies 1, so that the plurality of support plate assemblies 1 form an integral body, enhancing the continuity and stability of the support structure. This plug-in connection is fast and convenient. The multiple connecting rods disperse the force, avoiding single-point failure and enhancing the continuity and shear strength of the overall support structure.

[0036] The top reinforcement mechanism 4 is arranged on both sides of the top of the support plate 2 and includes a reinforcement rod 41 and an anchoring component 42. The reinforcement rod 41 vertically penetrates through the support plate 2, providing a basic supporting effect for the top reinforcement mechanism 4 and enhancing the stability of the top of the support plate 2. Among them, a connection through hole 201 for the reinforcement rod 41 to pass through is provided at the end of the support plate 2. The anchoring assembly 42 includes a reinforcement housing 411 connected to the top end of the reinforcement rod 41 and a reinforcement cone 412 built inside the reinforcement housing 411. The upper end face of the reinforcement cone 412 is provided with a lower pressing plate 4121, and the lower pressing plate 4121 is movably installed on the upper end face of the reinforcement housing 411. The reinforcement cone 412 moves downward with the lower pressing plate 4121 and inserts into the ground, simplifying the anchoring operation process. The lower pressing plate provides a stable force application point, ensuring that the reinforcement cone vertically penetrates the formation, avoiding deviation, and improving the anchoring reliability.

[0037] Among them, the reinforcement housing 411 is pressed downward by the lower pressing plate 4121, so that the reinforcement rod 41 enters the connection through hole 201. The end of the reinforcement housing 411 is embedded in the positioning groove 202 provided at the top of the support plate 2, enabling the top reinforcement mechanism 4 to be quickly positioned and improving the assembly efficiency of the top reinforcement mechanism 4.

[0038] A guide rod 413 and a spring 414 are provided between the reinforcement housing 411 and the lower pressing plate 4121. The spring 414 is sleeved outside the guide rod 413. Its upper end is connected to the lower end face of the lower pressing plate 4121, and its lower end is fixed to the reinforcement housing 411. The spring 414 provides a reset elastic force for the lower pressing plate 4121. The guide rod ensures that the reinforcement cone vertically inserts downward, and the spring prevents the reinforcement cone from being inserted into the muddy ground in advance, avoiding the need to pull out the reinforcement cone and refix it when adjusting the angle of the top reinforcement mechanism, thus improving the construction efficiency.

[0039] A transverse anchoring assembly 415 and a downward pressing handle 416 are provided inside the reinforcement cone 412. The transverse anchoring assembly 415 is slidably assembled in the inner cavity of the reinforcement cone 412. The downward pressing handle 416 passes through the lower pressing plate 4121 and abuts against the transverse anchoring assembly 415 for driving the transverse anchoring assembly 415 to expand and contract laterally. In this embodiment, multiple transverse anchoring assemblies 415 are provided and arranged along the depth direction of the reinforcement cone 412, improving the anchoring effect of the reinforcement cone 412.

[0040] The transverse anchoring assembly 415 includes a transverse insertion rod 4151, a abutting block 4152, and a reset assembly 4153. The abutting block 4152 and the reset assembly 4153 are respectively fixed to the upper end face and the lower end face of the transverse insertion rod 4151. The reset assembly 4153 includes a fixed rod 4153-1 and a reset spring 4153-2 sleeved on the fixed rod 4153-1. One end of the fixed rod 4153-1 is movably inserted into the inner wall of the reinforcement cone 412, and the other end is fixed to the transverse insertion rod 4151. The two ends of the reset spring 4153-2 abut against the inner wall of the reinforcement cone 412 and the end of the transverse insertion rod 4151, providing an axial elastic reset force for the transverse insertion rod 4151. An inclined abutting surface is provided between the abutting block 4152 and the end of the downward pressing handle 416. The transverse insertion rod 4151 is slidably assembled inside the reinforcement cone 412, and the cross-sectional dimension of the end of the transverse insertion rod 4151 far from the inner side of the reinforcement cone 412 gradually decreases along the axial direction.

[0041] This horizontal anchoring assembly 415 significantly enhances the uplift resistance of the reinforcement cone, improves the overall stability of the device, helps the foundation pit support structure resist external soil pressure and other possible loads, and prevents the structure at the upper end of the inner wall of the foundation pit support structure from deforming or becoming unstable due to excessive pressure. At the same time, the structure of the horizontal anchoring assembly is simple. The movement of the horizontal insertion rod can be controlled by pressing down the handle in cooperation with the reset assembly. The installation and disassembly are simple, reducing manual operation and ensuring the reusable nature of the anchoring assembly. The fixed rod ensures that the horizontal insertion rod moves in a straight line, and the reset spring extends the service life of the assembly, avoiding jamming of the horizontal insertion rod and improving the accuracy of the anchoring action. The tapered end of the horizontal insertion rod is more likely to penetrate the soil layer, reducing the risk of deformation of the insertion rod and increasing the contact area with the soil, thus enhancing the horizontal anchoring strength.

[0042] Furthermore, hoisting rods 5 are provided at the top of the fixed shell 31 and the top of the connecting plate 341. The hoisting rods 5 facilitate the hoisting and installation of the steel waling reinforcement assembly 3 and the plug-in fixing assembly 34 by the operator.

[0043] In a foundation pit project with complex geological conditions, the soil conditions around the foundation pit are complex, with alternating distribution of soft soil layers and rock layers of different hardness. When using the foundation pit support device of the present invention, first, the support plate assembly 1 is arranged along the circumference of the foundation pit. During the installation process, driven by the stepping motor 321 of the transmission mechanism 32, the telescopic support rod 33 is adjusted to an appropriate length according to the actual geological conditions and support requirements, and then the adjacent support plate assemblies 1 are connected by the plug-in fixing assembly 34 to form a stable overall support structure.

[0044] During the excavation of the foundation pit, due to the action of the reinforcement rod 41 and the anchoring assembly 42 of the top reinforcement mechanism 4, the lateral pressure resistance of the top of the support plate 2 is enhanced. When encountering uneven soil pressure, especially when the upper side of the inner wall of the foundation pit support structure bears a large pressure, the top reinforcement mechanism 4 can effectively resist the pressure and prevent the support plate 2 from tilting. The reinforcement cone 412 in the anchoring assembly 42 can be vertically inserted into the ground under the action of the guide rod 413 and the spring 414 to ensure the reliability of the anchoring. At the same time, by driving the horizontal insertion rod 4151 of the horizontal anchoring assembly 415 to extend by pressing down the handle 416, it is inserted into the surrounding soil, further enhancing the uplift resistance of the reinforcement cone and improving the stability of the entire support device under complex geological conditions, ensuring the safe progress of the foundation pit project.

[0045] Compared with the traditional technology for constructing foundation pit support structures, the foundation pit support device of the present invention has obvious advantages in terms of assembly efficiency. In the traditional technology, the on-site construction and assembly process is cumbersome, involving the installation and connection of a large number of components, which requires a large amount of time and manpower. In the foundation pit support device of the present invention, the telescopic support rod 33 of the steel waling reinforcement component 3 is automatically telescoped through the transmission mechanism 32, reducing the manual adjustment link and greatly improving the assembly efficiency. At the same time, the quick plug-in method of the plug-in fixing component 34 makes the connection of adjacent support plate components 1 more convenient, shortens the construction period, and reduces the construction cost. In practical engineering applications, using the foundation pit support device of the present invention can shorten the original assembly time that takes several days to half or even shorter, effectively improving the project progress and providing a strong guarantee for the successful completion of construction projects.

[0046] It can be seen from the above embodiments that the overall structure of the foundation pit support device of the present invention is highly stable, and it has significant advantages in improving assembly efficiency, enhancing support strength, and simplifying the anchoring operation. It is applicable to foundation pit projects under various complex geological conditions, can effectively ensure project safety, and reduce construction costs.

[0047] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A foundation pit support device, comprising a plurality of support plate assemblies (1) arranged circumferentially along the foundation pit, characterized in that, Each of the support plate assemblies (1) includes: A support plate (2) with an installation groove (20) provided on its inner wall; A steel waling reinforcement assembly (3), including: a fixed shell (31) embedded in the installation groove (20); a transmission mechanism (32) assembled in the fixed shell (31); a telescopic support rod (33) driven by the transmission mechanism (32) to perform telescopic movement on both sides of the fixed shell (31); and a plug-in fixing assembly (34) for connecting the ends of the telescopic support rods (33) of adjacent support plate assemblies (1). A top reinforcement mechanism (4) is provided on both sides at the top end of the support plate (2), including: a reinforcement rod (41) vertically passing through the support plate (2); and an anchoring assembly (42) including a reinforcement outer shell (411) connected to the top end of the reinforcement rod (41) and a reinforcement cone (412) built in the reinforcement outer shell (411).

2. The foundation pit support device according to claim 1, characterized in that An upper pressing plate (4121) is provided on the upper end surface of the reinforcement cone (412), and the upper pressing plate (4121) is movably installed on the upper end surface of the reinforcement outer shell (411); the reinforcement cone (412) moves downward with the upper pressing plate (4121) and inserts into the ground.

3. A foundation pit support device according to claim 2, characterized in that, A guide rod (413) and a spring (414) are provided between the reinforcement outer shell (411) and the upper pressing plate (4121); the spring (414) is sleeved outside the guide rod (413), its upper end is connected to the lower end surface of the upper pressing plate (4121), and the lower end is fixed to the reinforcement outer shell (411); the spring (414) provides a reset elastic force for the upper pressing plate (4121).

4. A foundation pit support device according to claim 2, wherein, A transverse anchoring assembly (415) and a downward pressing handle (416) are provided inside the reinforcement cone (412); the transverse anchoring assembly (415) is slidably assembled in the inner cavity of the reinforcement cone (412), and the downward pressing handle (416) passes through the upper pressing plate (4121) and abuts against the transverse anchoring assembly (415) for driving the transverse anchoring assembly (415) to expand and contract laterally.

5. A foundation pit support device according to claim 4, characterized in that, The transverse anchoring assembly (415) includes a transverse insertion rod (4151), a contact block (4152), and a reset assembly (4153). The contact block (4152) and the reset assembly (4153) are respectively fixed to the upper end surface and the lower end surface of the transverse insertion rod (4151). The reset assembly (4153) is used to provide an axial elastic reset force for the transverse insertion rod (4151). An inclined contact surface for mutual cooperation is provided between the contact block (4152) and the end of the downward pressing handle (416); the transverse insertion rod (4151) is slidably assembled inside the reinforcement cone (412).

6. A foundation pit support device according to claim 5, characterized in that, The reset assembly (4153) includes a fixed rod (4153-1) and a reset spring (4153-2) sleeved on the fixed rod (4153-1). One end of the fixed rod (4153-1) is movably inserted into the inner wall of the reinforcement cone (412), and the other end is fixed to the transverse insertion rod (4151); both ends of the reset spring (4153-2) abut against the inner wall of the reinforcement cone (412) and the end of the transverse insertion rod (4151).

7. The foundation pit support device according to claim 5, characterized in that One end of the transverse insertion rod (4151) away from the inner side of the reinforcement cone (412) gradually decreases in cross-sectional dimension along the axial direction.

8. A foundation pit support device according to claim 1, characterized in that, The transmission mechanism (32) includes a stepping motor (321) disposed within a fixed housing (31), a transmission rotating shaft (322) connected to the stepping motor (321), a first bevel gear (323) sleeved on the transmission rotating shaft (322), and a second bevel gear (324) meshed therewith. The second bevel gear (324) drives the telescopic support rod (33) to telescopically extend and retract synchronously along both sides of the fixed housing (31) through a transmission rod assembly (325).

9. A foundation pit support device according to claim 8, characterized in that, The transmission rod assembly (325) includes an internally threaded sleeve (3251), a threaded rod (3252), and a rotating shaft (3253). The threaded rod (3252) is fixedly connected to the rotating shaft (3253), and the internally threaded sleeve (3251) is threadedly connected to the threaded rod (3252). The internally threaded sleeve (3251) is fixed to the upper end of the telescopic support rod (33). The second bevel gear (324) drives the rotating shaft (3253) to drive the threaded rod (3252) to rotate, causing the internally threaded sleeve (3251) to move axially along the threaded rod (3252).

10. A foundation pit support device according to claim 1, characterized in that, The plug-in fixing assembly (34) includes a connecting plate (341) and a plurality of connecting rods (342) fixed to the lower end of the connecting plate (341). The plurality of connecting rods (342) are respectively plugged into through holes (331) formed at the ends of adjacent telescopic support rods (33).

Images