Prestressed anchor rod combined type supporting structure for foundation pit

Abstract

The utility model relates to the technical field of foundation pit supporting, and discloses a pre-stressed anchor rod combined type supporting structure for a foundation pit, which comprises a hollow anchor rod, the left end of the outer wall of the hollow anchor rod is in threaded connection with a steel expansion shell anchor head, the right end of the hollow anchor rod is fixedly connected with a base plate, and the left side of the base plate is fixedly connected with a stop-grouting plug. The right end of the outer wall of the hollow anchor rod is in threaded connection with a nut, the left side of the outer wall of the hollow anchor rod is fixedly connected with a fixing block, the outer wall of the fixing block is provided with a plurality of first anti-skid lines, the periphery of the outer wall of the fixing block is provided with a plurality of second connecting holes, and the inner walls of the second connecting holes are rotationally connected with first rotating columns; the outer walls of the multiple first rotating columns are fixedly connected with clamping blocks. According to the utility model, the clamping block can be better engaged with the soil body under the action of the pressure of the soil body through the rotating column I and the clamping block on the fixing block, so that the anchoring force between the fixing block and the soil body is further enhanced.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, and in particular to a prestressed anchor bolt combined support structure for foundation pits. Background Technology

[0002] With the development of engineering technology, the requirements for foundation pit support are becoming increasingly stringent. It is necessary not only to ensure the stability of the foundation pit itself, but also to strictly control the deformation of the surrounding soil to avoid damage to adjacent buildings and underground pipelines. Therefore, a prestressed anchor rod combined support structure for foundation pits is required.

[0003] A search revealed Chinese Patent Publication No. CN218060335U, which discloses a vertical prestressed anchor bolt combined steel support structure, relating to the field of foundation pit support. The structure includes several steel piles arranged in an orderly manner and driven into the soil. Horizontal steel plates connect the steel piles, and the steel piles and horizontal steel plates form a support wall. The end of the support wall is the bottom of the foundation pit, and the rear end is the top of the foundation pit. Anchor holes are installed in the soil layer at the top of the foundation pit, and anchor bolts are driven into these holes. The anchor bolts are connected to the front row of steel piles... Corresponding to the piles, longitudinal steel plates connect the anchor rods to the corresponding steel piles, and anchorages are fixed at the top of the anchor rods. This vertical prestressed anchor rod combined steel support structure uses vertical prestressed anchor rods to replace the traditional herringbone support structure, avoiding the problem of traditional inclined anchor rods easily extending beyond the building boundary line. The prestressed anchor rods penetrate vertically into the stable soil layer, have high anchoring bearing capacity, provide a large anti-overturning moment, effectively reduce foundation pit support deformation, and are easy to construct. The prestressed steel components of the prestressed anchor rods are disassembled and recyclable, making it energy-saving and environmentally friendly. However, several steel piles are connected by transverse steel plates to form a support wall. Under long-term soil pressure, vibration, and complex conditions of groundwater erosion, the connection between the steel piles and the transverse steel plates is prone to loosening and weld cracking, thereby reducing the anchoring force with the soil. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a prestressed anchor bolt combined support structure for foundation pits, aiming to improve the problem in the existing technology where the connection between the steel pile and the transverse steel plate is prone to loosening and weld cracking under complex working conditions such as long-term soil pressure, vibration and groundwater scouring, thereby reducing the anchoring force between the steel pile and the soil.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a prestressed anchor bolt combined support structure for foundation pits, comprising a hollow anchor bolt, a steel expansion shell anchor head threadedly connected to the left end of the outer wall of the hollow anchor bolt, a pad fixedly connected to the right end of the hollow anchor bolt, a grout stop plug fixedly connected to the left side of the pad, a nut threadedly connected to the right end of the outer wall of the hollow anchor bolt, a fixing block fixedly connected to the left side of the outer wall of the hollow anchor bolt, multiple anti-slip textures on the outer wall of the fixing block, multiple connecting holes on all four sides of the outer wall of the fixing block, rotating columns rotatably connected to the inner walls of the multiple connecting holes, locking blocks fixedly connected to the outer walls of the multiple rotating columns, and a fixing mechanism provided on the outer wall of the pad.

[0006] The above technical solution utilizes hollow anchor rods as the core load-bearing component of the entire support structure, playing a crucial role in transmitting tensile and compressive forces. Its left end is connected to a steel expansion-shell anchor head via threads. After insertion into the soil, the expansion-shell anchor head, through its special structural design, generates friction and anchoring force with the soil, thus stably fixing the hollow anchor rod within the soil. At the right end of the hollow anchor rod, a pad is used to distribute the pressure borne by the anchor rod, ensuring that the pressure is evenly transmitted to other parts of the support structure or the soil surface. A grout stopper fixed to the left side of the pad plate primarily prevents grout from flowing back through the gap between the anchor rod and the borehole wall during grouting operations. A fixing block on the left side of the outer wall of the hollow anchor rod is... The key connecting and auxiliary anchoring components have anti-slip textures on their outer walls to increase the friction between the fixing block and the soil, improving its stability within the soil. Multiple connecting holes are evenly distributed around the outer wall of the fixing block, providing a basis for the rotating column. The rotating column is installed in the connecting holes and can rotate freely. The locking block is fixed to the outer wall of the rotating column. During the insertion of the hollow anchor rod into the soil, the locking block can reduce the insertion resistance to a certain extent. When the anchor rod is inserted to the predetermined depth, the locking block will rotate or change position under the pressure of the soil or other external forces, thereby increasing the anchoring force between the fixing block and the soil and preventing axial displacement of the hollow anchor rod.

[0007] As a further description of the above technical solution:

[0008] The fixing mechanism includes two connecting blocks. The left side of each of the two connecting blocks is located at the upper and lower right sides of the pad. Each of the two connecting blocks has a connecting hole 1 on an adjacent side. The inner walls of each of the two connecting holes 1 are rotatably connected to a rotating column 2. The outer walls of each of the two rotating columns 2 are fixedly connected to a fixing valve. The left side of the outer walls of each of the two fixing valves has anti-slip texture 4.

[0009] The above technical solution involves rotating the rotating column two to drive the fixed valve to rotate, causing the anti-slip texture four on the left side of its outer wall to come into close contact with the surface of the object to be fixed. Due to the presence of the anti-slip texture four, the relative movement between the fixed valve and the contacting object can be effectively prevented under the action of friction, thereby achieving the fixation of the relevant components or structures.

[0010] As a further description of the above technical solution:

[0011] A connecting groove is provided in the middle of the right side of the outer wall of the pad. A baffle is provided on the right side of the outer wall of the connecting groove, and the connecting groove engages with the baffle.

[0012] The above technical solution involves: a steel expansion shell anchor head connected by a thread on the left end for anchoring the soil; a fixed pad with a grout stop plug on the right end; prestressing applied by a nut; a fixed block on the left side of the hollow anchor rod's outer wall with anti-slip texture 1 and a connecting hole 2; a rotating column 1 and a locking block to enhance the anchoring force; a rotating column 2 on the upper and lower connecting blocks on the right side of the pad 2 cooperating with a fixed valve; and an anti-slip texture 4 on the left side of the fixed valve's outer wall allowing for tight contact with the outside when operating the rotating column 2 to achieve fixation.

[0013] As a further description of the above technical solution:

[0014] Multiple protrusions are fixedly connected to the left side of the outer wall of the pad, and the outer walls of the multiple protrusions are provided with anti-slip texture.

[0015] The above technical solution involves multiple protrusions evenly distributed on the left side of the outer wall of the pad. When the prestressed anchor bolt combined support structure is installed in the foundation pit and bears soil pressure, these protrusions on the left side of the pad and the anti-slip texture II on them will be in close contact with the surrounding soil. Due to the presence of the anti-slip texture II, the friction between the pad and the soil is greatly increased, making the pad more stable in resisting the lateral force and pressure from the soil and preventing it from slipping or displacing during the stress process.

[0016] As a further description of the above technical solution:

[0017] A sealing groove is provided on the middle left side of the outer wall of the pad, and a sealing ring is fixedly connected to the inner wall of the sealing groove.

[0018] Through the above technical solution: when the prestressed anchor bolt combined support structure is working, when grouting is being carried out or when there is groundwater fluid medium during the use of the foundation pit, the sealing ring can effectively prevent fluid from leaking from the gap between the pad and the surrounding soil or other adjacent components. Because the sealing ring is elastic, it is compressed in the sealing groove during installation. When subjected to fluid pressure or other external forces, it will further adhere tightly to the inner wall of the sealing groove and the surface of adjacent components, forming a reliable sealing barrier.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the steel expansion shell anchor head is provided with multiple anti-slip grooves, and the multiple anti-slip grooves are equally spaced on the outer wall of the steel expansion shell anchor head.

[0021] Through the above technical solution: when the steel expansion-shell anchor head is inserted into the soil, the anti-slip grooves (type 3) directly contact and interact with the soil. As the anchor head penetrates deeper, the soil deforms under the resistance of the anti-slip grooves (type 3) and fills the grooves within them, forming a mechanical interlocking effect. This interlocking effect greatly increases the friction and adhesion between the anchor head and the soil, allowing the anchor head to be more firmly anchored in the soil and withstand various loads from the hollow anchor rod, including tensile, compressive, and lateral forces. This effectively improves the stability and reliability of the entire prestressed anchor rod composite support structure.

[0022] As a further description of the above technical solution:

[0023] The pad has two connecting grooves on its upper and lower right sides, and connecting blocks are fixedly connected to the inner walls of the two connecting grooves.

[0024] The above technical solution provides an additional stable connection point for the entire support structure through the combination of connecting groove 2 and connecting block. When the prestressed anchor rod is subjected to tension or compression, the force is transmitted to the pad through the hollow anchor rod. The cooperation between connecting groove 2 and connecting block can effectively distribute the force to other connected components.

[0025] As a further description of the above technical solution:

[0026] The left sides of the two fixed valves are fixedly connected at equal intervals to the upper and lower ends of the right side of the pad, and the adjacent connecting blocks are fixedly connected at equal intervals.

[0027] Through the above technical solution, the two connecting blocks are fixedly connected at equal intervals, which enhances their overall rigidity and resistance to deformation. When facing complex stress environments, uneven soil pressure, or vibration and impact generated during construction, the connecting blocks can maintain a relatively stable shape and positional relationship, providing a reliable support foundation for the associated rotating column and fixed valve.

[0028] This utility model has the following beneficial effects:

[0029] 1. In this utility model, the hollow anchor rod opens under the pressure of the borehole wall and comes into close contact with the soil to generate friction and anchoring force, thus achieving initial anchoring. As the hollow anchor rod enters the soil, the anti-slip texture on its outer wall increases the friction with the soil, further stabilizing the position of the hollow anchor rod and preventing its axial displacement. At the same time, the rotating column and the locking block on the fixing block, under the action of soil pressure, enable the locking block to better engage with the soil, further enhancing the anchoring force between the fixing block and the soil.

[0030] 2. In this utility model, through the cooperation of connecting hole one, rotating column two and fixed valve, when the anti-slip texture four on the left side of the outer wall of the fixed valve is in close contact with the surface of other components that need to be connected, reliable connection and fixation can be achieved by the friction generated by the anti-slip texture four. This connection method can effectively prevent loosening and displacement between connected components, ensure that each component forms a stable whole, enhance the stability of the entire support structure system, enable it to cope with complex stress conditions, and better protect the safety of the foundation pit. Attached Figure Description

[0031] Figure 1 This is a perspective view of a prestressed anchor bolt combined support structure for foundation pits proposed in this utility model;

[0032] Figure 2 This is a front view of a prestressed anchor bolt combined support structure for foundation pits proposed in this utility model;

[0033] Figure 3 This is a partial structural illustration of a prestressed anchor bolt combined support structure for foundation pits proposed in this utility model;

[0034] Figure 4 This is a partial structural schematic diagram of a prestressed anchor bolt combined support structure for foundation pits proposed in this utility model;

[0035] Figure 5 This is a split view of the fixing mechanism of a prestressed anchor bolt combined support structure for foundation pits proposed in this utility model.

[0036] Legend:

[0037] 1. Hollow anchor bolt; 2. Fixing mechanism; 201. Connecting block; 202. Connecting hole one; 203. Rotating column two; 204. Fixing valve; 205. Anti-slip texture four; 3. Steel expansion shell anchor head; 4. Pad plate; 5. Grout stop plug; 6. Nut; 7. Fixing block; 8. Anti-slip texture one; 9. Connecting hole two; 10. Rotating column one; 11. Locking block; 12. Connecting groove one; 13. Baffle plate; 14. Protrusion block; 15. Anti-slip texture two; 16. Sealing groove; 17. Sealing ring; 18. Anti-slip texture three; 19. Connecting groove two. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Reference Figure 1 , Figure 2 and Figure 3 An embodiment of this utility model provides a prestressed anchor bolt combined support structure for foundation pits, including a hollow anchor bolt 1. A steel expansion shell anchor head 3 is threadedly connected to the left end of the outer wall of the hollow anchor bolt 1. A pad plate 4 is fixedly connected to the right end of the hollow anchor bolt 1. A grout stop plug 5 is fixedly connected to the left side of the pad plate 4. A nut 6 is threadedly connected to the right end of the outer wall of the hollow anchor bolt 1. A fixing block 7 is fixedly connected to the left side of the outer wall of the hollow anchor bolt 1. The outer wall of the fixing block 7 has multiple anti-slip textures 8. Multiple connecting holes 9 are opened around the outer wall of the fixing block 7. Rotating columns 10 are rotatably connected to the inner walls of the multiple connecting holes 9. Locking blocks 11 are fixedly connected to the outer walls of the multiple rotating columns 10. A fixing mechanism 2 is provided on the outer wall of the pad plate 4.

[0040] Specifically, firstly, the hollow anchor rod 1 with a steel expansion shell anchor head 3 is inserted into the pre-drilled foundation pit borehole. During insertion, the steel expansion shell anchor head 3 gradually expands under the pressure of the borehole wall, making close contact with the soil of the borehole wall, thereby generating friction and anchoring force, initially fixing the hollow anchor rod 1 in the predetermined position in the soil. At the same time, the fixing block 7 on the left side of the outer wall of the hollow anchor rod 1 also enters the soil. The anti-slip texture 8 on the outer wall of the fixing block 7 increases the friction with the soil. The rotating column 10 and the locking block 11 on the fixing block 7 also play an important role. Under the action of soil pressure, the locking block 11 better engages with the soil, further enhancing the anchor rod's anchoring force. The anchoring force between the fixed block 7 and the soil is determined by the following steps: After the hollow anchor rod 1 is inserted to a suitable depth, a pad 4 and a grout stop plug 5 are installed on the right end of the hollow anchor rod 1, and a nut 6 is screwed on. At this time, the nut 6 is not yet tightened and is in an adjustable state. By tightening the nut 6, the nut 6 applies a rightward pressure to the pad 4, and the pad 4 then applies a tensile force to the hollow anchor rod 1, causing the hollow anchor rod 1 to generate prestress. This prestress can adjust the stress state of the hollow anchor rod 1, so that it is in a tensile state before the soil in the foundation pit undergoes large deformation, thereby effectively improving the resistance of the support structure to soil deformation and ensuring the stable anchoring of the hollow anchor rod 1 in the soil.

[0041] Reference Figure 2 , Figure 4 and Figure 5The fixing mechanism 2 includes two connecting blocks 201. The left side of each connecting block 201 is located at the upper and lower right sides of the pad 4. Each of the two connecting blocks 201 has a connecting hole 202 on an adjacent side. The inner wall of each connecting hole 202 is rotatably connected to a rotating column 203. The outer wall of each rotating column 203 is fixedly connected to a fixing valve 204. The left side of the outer wall of each fixing valve 204 has anti-slip texture 205.

[0042] Specifically, during the installation of the prestressed anchor bolt combined support structure, after the initial installation of the main components such as the hollow anchor bolt 1, the steel expansion shell anchor head 3, the pad plate 4, and the nut 6 is completed, the two connecting blocks 201 are firmly placed on the upper and lower right sides of the pad plate 4. The determination of their positions provides a basic framework for the effective function of the subsequent fixing valve 204. The connecting hole 1 202 precisely defines the rotation axis and range of motion of the rotating column 2 203, ensuring its rotation stability and operability. At this time, the operator starts to tighten the nut 6. As the nut 6 is gradually tightened, the hollow anchor bolt 1 begins to bear tension and generate prestress. In this process, in order to enhance the stability and connection reliability of the entire support structure, the operator simultaneously rotates the fixed valve 204, and the rotating column 203 rotates flexibly around the connecting hole 202, causing the fixed valve 204 to change its angle and position. When the fixed valve 204 rotates to the point where the anti-slip texture 205 on the left side of its outer wall comes into contact with the surface of a specific target structure or component, due to the unique texture design of the anti-slip texture 205, a preliminary frictional force begins to form between the two. As the operator continues to rotate the fixed valve 204, its pressure on the target surface gradually increases. According to the physical principle of friction, the magnitude of the frictional force is directly proportional to the normal force.

[0043] Reference Figure 2 , Figure 3 and Figure 4 A connecting groove 12 is provided in the middle of the right side of the outer wall of the pad 4. A baffle 13 is provided on the right side of the outer wall of the connecting groove 12. The connecting groove 12 and the baffle 13 are engaged. Multiple protrusions 14 are fixedly connected to the left side of the outer wall of the pad 4. The outer walls of the multiple protrusions 14 are provided with anti-slip texture 15. A sealing groove 16 is provided in the middle of the left side of the outer wall of the pad 4. A sealing ring 17 is fixedly connected to the inner wall of the sealing groove 16.

[0044] Specifically, during the assembly or subsequent maintenance of the support structure, when it is necessary to install certain auxiliary components or expand the structure on the pad 4, the engaging structure of the connecting groove 12 and the baffle 13 can be used. First, the connecting part of the auxiliary component is placed in the connecting groove 12, and then the baffle 13 is inserted into the connecting groove 12. The left side of the pad 4 is in close contact with the surrounding soil. The multiple protrusions 14 and the anti-slip texture 15 on their outer walls significantly increase the friction between the pad 4 and the soil. The texture design of the anti-slip texture 15 allows the soil to be better embedded. The sealing ring 17 in the sealing groove 16 plays a key role when the sealing plate 4 slips in the soil, whether it is subjected to vertical soil pressure or lateral thrust. When grouting is carried out or when there are fluid media such as groundwater in the foundation pit, the sealing ring 17 in the sealing groove 16 is usually made of elastic rubber material and is compressed in the sealing groove 16 during installation. When subjected to fluid pressure or other external forces, the sealing ring 17 will further fit tightly against the inner wall of the sealing groove 16 and the surface of adjacent components, forming a reliable sealing barrier.

[0045] Reference Figure 1 , Figure 3 and Figure 5 The outer wall of the steel expansion shell anchor head 3 is provided with multiple anti-slip textures 18, which are equidistantly provided on the outer wall of the steel expansion shell anchor head 3; the upper and lower right ends of the pad plate 4 are provided with connecting grooves 19, and connecting blocks 201 are fixedly connected to the inner walls of the two connecting grooves 19; the left sides of the two fixed valves 204 are equidistantly fixedly connected to the upper and lower right ends of the pad plate 4, and the adjacent connecting blocks 201 are equidistantly fixedly connected.

[0046] Specifically, during the drilling process of the steel expansion shell anchor head 3 into the soil, multiple equidistant anti-slip grooves 18 on its outer wall begin to contact the soil. Due to the presence of the anti-slip grooves 18, soil particles will sink into the grooves. As the anchor head continues to penetrate deeper, the soil is compressed and deformed along the shape of the anti-slip grooves 18. The combination of the connecting groove 19 and the connecting block 201 provides an additional stable connection point and force transmission path for the entire support structure. When prestress is applied to the hollow anchor rod 1, the force is transmitted through the pad 4. At this time, the connecting block 201, as a key force transmission component, effectively distributes the force borne by the pad 4 to other connected components. Two fixed valves 204 are equidistantly fixed at the upper and lower ends of the right side of the pad 4. This layout allows for uniform distribution of force when fixing or connecting components. When the fixed valves 204 connect with other components and apply pressure through the rotating column 203, the fixed valves 204 at the upper and lower ends work together to avoid excessive or insufficient local force, ensuring the stability and reliability of the connection.

[0047] Working principle: The hollow anchor rod 1 of the steel expansion shell anchor head 3 is inserted into the pre-drilled foundation pit borehole. During the insertion process, the steel expansion shell anchor head 3 gradually opens under the pressure of the borehole wall, making close contact with the soil of the borehole wall, thereby generating friction and anchoring force, initially fixing the hollow anchor rod 1 in the predetermined position in the soil. At the same time, the fixing block 7 on the left side of the outer wall of the hollow anchor rod 1 also enters the soil. The anti-slip texture 8 on the outer wall of the fixing block 7 increases the friction with the soil. The rotating column 10 and the locking block 11 on the fixing block 7 also play an important role. Under the action of soil pressure, the locking block 11 better engages with the soil, further enhancing the consolidation. The anchoring force between the fixed block 7 and the soil is as follows: After the hollow anchor rod 1 is inserted to a suitable depth, the pad plate 4 and the grout stop plug 5 are installed on the right end of the hollow anchor rod 1, and the nut 6 is screwed on. At this time, the nut 6 is not yet tightened and is in an adjustable state. By tightening the nut 6, the nut 6 applies a rightward pressure to the pad plate 4, and the pad plate 4 then applies a tensile force to the hollow anchor rod 1, so that the hollow anchor rod 1 generates prestress. This prestress can adjust the stress state of the hollow anchor rod 1, so that it is in a tensile state before the foundation pit soil undergoes large deformation, thereby effectively improving the resistance of the support structure to soil deformation and ensuring the stable anchoring of the hollow anchor rod 1 in the soil.

[0048] Furthermore, the two connecting blocks 201 are tightly connected to the upper and lower right sides of the pad 4, forming a stable and symmetrical basic structure. The connecting hole 1 202 not only accurately determines the rotation center of the rotating column 203, but also ensures the smoothness and stability of the rotating column 203 during rotation due to its precise machining tolerance, effectively avoiding structural instability caused by shaking or jamming. As the tightening operation of the nut 6 is initiated, the prestress inside the hollow anchor rod 1 gradually forms and continues to increase. During this process, the operator rotates the fixed valve 204 in a timely manner, and the rotating column 203 rotates according to the connecting hole 202. The axis defined by the connector hole 202 rotates smoothly and flexibly, thereby driving the fixed valve 204 to dynamically adjust its angle and position. When the anti-slip texture 205 on the left side of the outer wall of the fixed valve 204 first contacts the surface of the target structure or component, the micro-texture structure of the anti-slip texture 205 interlocks with the target surface, generating initial friction. As the operator continues to apply rotational torque, the fixed valve 204 gradually presses against the target surface, and the positive pressure continues to rise. According to the linear relationship between friction and positive pressure, the friction between the two also increases significantly, thereby achieving precise fixing of the nut 6.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prestressed anchor bolt combined support structure for foundation pits, comprising hollow anchor bolts (1), characterized in that: The hollow anchor rod (1) is threaded with a steel expansion shell anchor head (3) on the left end of its outer wall. The hollow anchor rod (1) is fixedly connected with a pad plate (4) on the right end. The pad plate (4) is fixedly connected with a grout stop plug (5) on the left side. The hollow anchor rod (1) is threaded with a nut (6) on the right end of its outer wall. The hollow anchor rod (1) is fixedly connected with a fixing block (7) on the left side of its outer wall. The fixing block (7) has multiple anti-slip textures (8) on its outer wall. The fixing block (7) has multiple connecting holes (9) around its outer wall. The inner walls of the multiple connecting holes (9) are rotatably connected with rotating columns (10). The outer walls of the multiple rotating columns (10) are fixedly connected with locking blocks (11). The pad plate (4) is provided with a fixing mechanism (2) on its outer wall.

2. The prestressed anchor bolt combined support structure for foundation pits according to claim 1, characterized in that: The fixing mechanism (2) includes two connecting blocks (201). The left sides of the two connecting blocks (201) are located at the upper and lower right sides of the pad (4). A connecting hole (202) is provided on the adjacent side of the two connecting blocks (201). A rotating column (203) is rotatably connected to the inner wall of the two connecting holes (202). A fixing valve (204) is fixedly connected to the outer wall of the two rotating columns (203). Anti-slip texture (205) is provided on the left side of the outer wall of the two fixing valves (204).

3. The prestressed anchor bolt combined support structure for foundation pits according to claim 1, characterized in that: A connecting groove (12) is provided on the middle right side of the outer wall of the pad (4). A baffle (13) is provided on the right side of the outer wall of the connecting groove (12). The connecting groove (12) and the baffle (13) are engaged.

4. The prestressed anchor bolt combined support structure for foundation pits according to claim 1, characterized in that: Multiple protrusions (14) are fixedly connected to the left side of the outer wall of the pad (4), and the outer walls of the multiple protrusions (14) are provided with anti-slip textures (15).

5. A prestressed anchor bolt combined support structure for foundation pits according to claim 1, characterized in that: A sealing groove (16) is provided on the middle left side of the outer wall of the pad (4), and a sealing ring (17) is fixedly connected to the inner wall of the sealing groove (16).

6. The prestressed anchor bolt combined support structure for foundation pits according to claim 1, characterized in that: The outer wall of the steel expansion shell anchor head (3) is provided with multiple anti-slip textures (18) around its perimeter, and the multiple anti-slip textures (18) are provided at equal intervals on the outer wall of the steel expansion shell anchor head (3).

7. A prestressed anchor bolt combined support structure for foundation pits according to claim 2, characterized in that: The upper and lower ends of the right side of the pad (4) are provided with connecting grooves (19), and connecting blocks (201) are fixedly connected to the inner walls of the two connecting grooves (19).

8. A prestressed anchor bolt combined support structure for foundation pits according to claim 2, characterized in that: The left sides of the two fixed valves (204) are fixedly connected at equal distances to the upper and lower ends of the right side of the pad (4), and the adjacent connecting blocks (201) are fixedly connected at equal distances.

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