A deep foundation pit support device and its construction method

Abstract

This application relates to a deep foundation pit support device and its construction method, belonging to the technical field of foundation pit support. The deep foundation pit support device includes: a support device and a fixing device. The support device includes side support plates for supporting the sidewalls of the deep foundation pit, a bottom support plate for supporting the bottom wall of the deep foundation pit, and a strut for connecting the side support plates and the bottom support plates. One end of the strut is fixedly connected to the side support plate, and the other end of the strut is fixedly connected to the bottom support plate. The fixing device includes a plurality of fixing nails for inserting into the inner wall of the deep foundation pit. At least one fixing nail is provided through the side support plate and the bottom support plate. The fixing nail is hollow, and a fixing hole is opened in the sidewall of the fixing nail. A reinforcing mechanism is provided inside the fixing nail. The reinforcing mechanism includes a driving component and a reinforcing nail, and the reinforcing mechanism can drive the reinforcing nail to pass through the fixing hole. This application has the effect of reducing the warping of the fixing nails.

Description

Technical Field

[0001] This application relates to the field of foundation pit support, and in particular to a deep foundation pit support device and its construction method. Background Technology

[0002] With the rapid development of society and the economy, housing construction is increasingly prevalent in urban development. In construction engineering, foundation pit support is a crucial component. Foundation pit support is a protective measure implemented to ensure the safety of the surrounding environment and to guarantee the construction of underground structures. It involves using retaining and reinforcement measures on the sidewalls of the foundation pit and its surrounding environment, primarily to prevent catastrophic displacement of the slope. Simultaneously, it also ensures that the foundations of adjacent buildings do not shift.

[0003] In related technologies, foundation pit support equipment includes side support plates, bottom support plates, struts, and fixing nails. The side support plates and bottom support plates are perpendicular to each other. One end of the strut is fixedly connected to the side support plate, and the other end of the strut is fixedly connected to the bottom support plate. A fixing nail is threaded through both the side support plate and the bottom support plate. In use, the side support plate is aligned with the side wall of the deep foundation pit, and the bottom support plate is aligned with the bottom wall. The fixing nails are then inserted into the side and bottom walls of the deep foundation pit. The side support plates support the side wall of the foundation pit, thereby reducing destructive displacement of the slope.

[0004] Regarding the aforementioned technologies, if the pressure on the side support plate of the slope is too great, the pressure on the fixing nails will increase, which will cause the fixing nails to lift out of the soil, resulting in a reduction in the support for the side wall of the foundation pit. Summary of the Invention

[0005] The purpose of this application is to provide a deep foundation pit support device and its construction method that reduces the warping of fixing nails.

[0006] In a first aspect, the deep foundation pit support equipment provided in this application adopts the following technical solution: a deep foundation pit support equipment, comprising: a support device and a fixing device, wherein the support device comprises a side support plate for supporting the side wall of the deep foundation pit, a bottom support plate for supporting the bottom wall of the deep foundation pit, and a support rod for connecting the side support plate and the bottom support plate, wherein one end of the support rod is fixedly connected to the side support plate, and the other end of the support rod is fixedly connected to the bottom support plate;

[0007] The fixing device includes a number of fixing nails for inserting into the inner wall of the deep foundation pit, and at least one of the fixing nails is provided through the side support plate and the bottom support plate.

[0008] The fixing nail is hollow, and a fixing hole is provided on the side wall of the fixing nail. A reinforcing mechanism is provided inside the fixing nail. The reinforcing mechanism includes a driving component and a reinforcing nail. The reinforcing mechanism can drive the reinforcing nail through the fixing hole.

[0009] By adopting the above scheme, after the fixing nail is inserted into the soil layer, the driving mechanism drives the reinforcing nail to be inserted into the soil layer. Then, when the fixing nail has a tendency to tilt up, the reinforcing nail limits the fixing nail in the vertical direction, thereby increasing the stability of the fixing nail and reducing the possibility of the fixing nail tilting up.

[0010] Optionally, the drive assembly includes a telescopic component, a drive rod, and a mounting plate;

[0011] At least one telescopic member is installed on both the side support plate and the bottom support plate. Each fixing nail corresponds to one telescopic member. The output end of the telescopic member passes through the side support plate or the bottom support plate and is inserted into the corresponding fixing nail.

[0012] One end of the drive rod is hinged to the output end of the telescopic component, and the other end of the drive rod is hinged to the mounting plate;

[0013] The mounting plate is slidably connected to the inner wall of the fixing nail, and the reinforcing nail is fixedly connected to the side wall of the mounting plate.

[0014] By adopting the above technical solution, the telescopic component extends, pushing the drive rod to move. The drive rod connects with the mounting plate, thereby pushing the mounting plate to slide in the radial direction of the fixing nail, so that the reinforcing nail passes through the fixing hole and reinforces the fixing nail.

[0015] Optionally, there are several fixing holes and several reinforcing nails, and all of the reinforcing nails are disposed in the fixing nails, with the fixing holes and the reinforcing nails corresponding one-to-one;

[0016] There are several mounting plates, and each mounting plate is slidably connected to the inner wall of the fixing nail. Each mounting plate is fixedly connected to one of the reinforcing nails.

[0017] A linkage component is provided between adjacent mounting plates, which drives the reinforcing nail to pass through the fixing hole.

[0018] The reinforcement effect of a single reinforcing nail is limited. By adopting the above technical solution, multiple reinforcing nails move together under the drive of the linkage component, so that multiple reinforcing nails are inserted into the soil layer, which further increases the stability of the fixing nail and further reduces the possibility of the fixing nail lifting.

[0019] Optionally, the linkage assembly includes a gear and a rack;

[0020] A gear is provided between adjacent mounting plates, and the gear is rotatably connected to the inner wall of the fixing nail;

[0021] Two racks are provided between adjacent mounting plates, one rack being fixedly connected to one of the mounting plates, and the other rack being fixedly connected to the other mounting plate;

[0022] The gear is positioned between adjacent racks and meshes with both racks.

[0023] By adopting the above technical solution, when the mounting plate slides, it drives the rack to move, which in turn drives the gear to rotate, thereby driving another rack meshing with the gear to move, which in turn drives the mounting plate connected to the other rack to move, and thus drives all the mounting plates to move together, so that all the reinforcing nails are inserted into the soil layer to reinforce the fixing nails.

[0024] Optionally, the linkage assembly includes a fixed pulley and a connecting rope;

[0025] Two fixed pulleys are provided between adjacent mounting plates, and the two fixed pulleys are symmetrically arranged about the central axis of the fixing nail;

[0026] The connecting rope is looped and sleeved on two adjacent fixed pulleys;

[0027] The adjacent mounting plates are all fixedly connected to the connecting rope.

[0028] Using a rack and pinion transmission requires reserving space for the rack to move, thus limiting the reinforcing nail to a maximum length equal to its radius. By adopting the above technical solution, a connecting rope is used to move the mounting plate, which can be installed close to the inner wall of the fixing nail, thereby further increasing the length of the reinforcing nail and thus further enhancing its reinforcement effect.

[0029] Optionally, each of the mounting plates is provided with a through hole, the through hole being close to the central axis of the mounting plate;

[0030] The connecting rope passes through the perforation and is fixedly connected to the mounting plate.

[0031] The connecting rope is attached to one end of the mounting plate. When the mounting plate is pulled, it tends to rotate, which increases the friction between the mounting plate and the inner wall of the fixing nail, thus increasing the difficulty of the mounting plate sliding. By adopting the above technical solution, the connecting rope is attached to a position close to the center of the mounting plate, which reduces the tendency of the mounting plate to rotate during the pulling process, thereby reducing the friction of the mounting plate sliding and reducing the difficulty of the mounting plate sliding.

[0032] Optionally, a plurality of sealing components are installed on the inner wall of the fixing nail, and a sealing component is provided at each of the plurality of fixing hole positions;

[0033] The sealing assembly includes a sealing block, an elastic element, and a fixing block, wherein there are two fixing blocks arranged symmetrically about the fixing hole;

[0034] There are two blocking blocks, and both blocking blocks are disposed between the two fixing blocks;

[0035] The elastic element is disposed between the blocking block and the fixing block, with one end of the elastic element fixedly connected to the blocking block and the other end of the elastic element fixedly connected to the fixing block;

[0036] The two fixed blocks are provided with guide slopes on the side that is close to each other.

[0037] During the insertion of the fixing nail into the soil layer, soil may enter the fixing nail from the fixing hole and adhere to the moving parts inside the fixing nail, causing the moving parts to feel blocked or even jam during movement. By adopting the above technical solution, the sealing block is located at the fixing hole during the insertion of the fixing nail into the soil layer, thereby reducing the possibility of soil entering the fixing nail from the fixing hole and reducing the possibility of the moving parts inside the fixing nail jamming.

[0038] Optionally, the guide bevel is an arc surface and is adapted to the shape of the tip of the reinforcing nail.

[0039] Typically, the guide bevel is a flat surface, while the tip of the reinforcing nail is conical, resulting in a line contact with the guide bevel. This increases the pressure on the guide bevel and consequently increases its wear. By adopting the above technical solution, the guide bevel is matched with the tip of the reinforcing nail, resulting in a surface contact between the guide bevel and the nail tip. This reduces the pressure of the reinforcing nail on the guide bevel and thus reduces its wear.

[0040] Optionally, the fixing nail includes a nail head and a nail body, wherein the nail head is threadedly connected to the nail body.

[0041] During the retraction of the anchoring nails, a small amount of soil may follow the anchoring nails into the nails and accumulate inside. By adopting the above technical solution, after the deep foundation pit support equipment is retrieved, the nail head is opened to clean the inside of the anchoring nails, reducing the amount of soil inside the anchoring nails and thus reducing the possibility of jamming of the moving parts inside the anchoring nails.

[0042] Secondly, this application provides a construction method for a deep foundation pit support device using the aforementioned deep foundation pit support equipment, employing the following technical solution:

[0043] S1: Leveling the site: Leveling the bottom and side walls of the deep foundation pit;

[0044] S2: Fixed point: Measurement and positioning to determine the location for installing support equipment;

[0045] S3: Press the bottom support plate firmly against the bottom wall of the deep foundation pit;

[0046] S4: Fix one end of the support rod to the bottom support plate;

[0047] S5: Press the side support plate against the side wall of the deep pit and fix it to the end of the drive rod away from the bottom support plate;

[0048] S6: Two fixing nails penetrate the bottom support plate and the side support plate respectively and are inserted into the soil;

[0049] S7: Open the expansion joint: Allow several reinforcing nails to pass through the fixing holes and be inserted into the soil layer.

[0050] By adopting the above technical solution, the reinforcing nails are inserted into the soil layer, which increases the stability of the fixing nails and reduces the possibility of the fixing nails lifting up.

[0051] In summary, this application includes at least one of the following beneficial technical effects:

[0052] 1. After the fixing nail is inserted into the soil layer, the drive mechanism drives the reinforcing nail to be inserted into the soil layer. Then, when the fixing nail has a tendency to tilt, the reinforcing nail limits the fixing nail in the vertical direction, thereby increasing the stability of the fixing nail and reducing the possibility of the fixing nail tilting.

[0053] 2. The mounting plate can be installed close to the inner wall of the fixing nail, which further increases the length of the reinforcing nail and thus further enhances the reinforcement effect of the fixing nail;

[0054] 3. During the insertion of the fixing nail into the soil layer, the sealing block is located at the fixing hole, thereby reducing the possibility of soil entering the fixing nail from the fixing hole and reducing the possibility of the moving parts inside the fixing nail getting stuck. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the overall structure of a deep foundation pit support device according to an embodiment of this application.

[0056] Figure 2 This is a cross-sectional view of Embodiment 1 of this application used to illustrate the internal structure of the fixing nail.

[0057] Figure 3 This is a cross-sectional view of Embodiment 1 of this application used to illustrate the structure of the sealing component.

[0058] Figure 4 This is a cross-sectional view of Embodiment 2 of this application, illustrating the internal structure of the fixing nail.

[0059] In the picture:

[0060] 1. Support device; 11. Side support plate; 12. Bottom support plate; 13. Support rod;

[0061] 2. Fixing device; 21. Fixing nail; 211. Nail head; 212. Nail body; 213. Fixing hole; 22. Limiting plate;

[0062] 3. Reinforcing mechanism; 31. Drive assembly; 311. Telescopic component; 312. Drive rod; 313. Mounting plate; 32. Reinforcing nail;

[0063] 4. Linkage components; 41. Gear; 42. Rack; 43. Fixed pulley; 44. Connecting rope;

[0064] 5. Sealing component; 51. Sealing block; 511. Guide ramp; 52. Elastic element; 53. Fixing block. Detailed Implementation

[0065] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0066] Example 1: A deep foundation pit support device, referring to Figure 1 and Figure 2 The system includes a support device 1 and a fixing device 2. The support device 1 includes a side support plate 11, a bottom support plate 12, and a support rod 13. One end of the support rod 13 is fixedly connected to the side support plate 11, and the other end is fixedly connected to the bottom support plate 12. The fixing device 2 includes several fixing nails 21, two in this embodiment. The side support plate 11 and the bottom support plate 12 have mounting holes for the fixing nails 21 to pass through. A limiting plate 22 is integrally formed on the top surface of each fixing nail 21, and the diameter of the limiting plate 22 is larger than the inner diameter of the mounting hole. Each fixing nail 21 includes a nail head 211 and a nail body 212, which are threaded together.

[0067] Reference Figure 2 The fixing nail 21 is hollow, and several fixing holes 213 are formed on its side wall. A reinforcing mechanism 3 is provided inside the fixing nail 21. The reinforcing mechanism 3 includes a driving component 31 and a reinforcing nail 32. The position of the reinforcing nail 32 corresponds to the position of the fixing hole 213. The driving component 31 drives the fixing nail 21 away from the nail head 211 to move towards the fixing hole 213. A linkage component 4 is provided between adjacent reinforcing nails 32. The movement of the reinforcing nail 32 away from the nail head 211 drives other reinforcing nails 32 to move towards the fixing hole 213 through the linkage component 4.

[0068] During installation, the side support plate 11 is pressed tightly against the side wall of the deep foundation pit, and the bottom support plate 12 is pressed tightly against the bottom wall of the deep foundation pit. Then, one fixing nail 21 is passed through the mounting hole on the bottom support plate 12 and inserted into the soil. Another fixing nail 21 is passed through the mounting hole on the side support plate 11 and inserted into the soil. The drive assembly 31 operates, causing the reinforcing nails 32 furthest from the nail head 211 to move towards the fixing hole 213. At the same time, other reinforcing nails 32, driven by the linkage assembly 4, move towards their corresponding fixing holes 213. This continues until all reinforcing nails 32 have passed through the fixing holes 213 and are inserted into the soil, thus making the fixing nails 21 more securely fixed in the soil.

[0069] Reference Figure 2 and Figure 3 Several sealing components 5 are installed on the inner wall of the fixing nail 21, with one sealing component 5 installed at each fixing hole 213. Each sealing component 5 includes a sealing block 51, an elastic element 52, and a fixing block 53. There are two fixing blocks 53, two elastic elements 52, and two sealing blocks 51. The two fixing blocks 53 are fixedly connected to the inner wall of the fixing nail 21 and are symmetrical about the central axis of the fixing hole 213. The two sealing blocks 51 are positioned between the two fixing blocks 53 and fixedly connected to the inner wall of the fixing nail 21. The two sealing blocks 51 are symmetrically positioned about the central axis of the fixing hole 213. A guide slope 511 is provided on the side of the two sealing blocks 51 that is close to each other. The guide slope 511 is curved and adapted to the shape of the nail tip of the reinforcing nail 32. The elastic element 52 is positioned between the sealing block 51 and the fixing block 53 on one side of the fixing hole 213. One end of the elastic element 52 is fixedly connected to the sealing block 51, and the other end is fixedly connected to the fixing block 53.

[0070] During the process of the reinforcing nail 32 moving toward the fixing hole 213, the reinforcing nail 32 first contacts the guide slope 511. Under the guidance of the guide slope 511, the two sealing blocks 51 move away from each other, thereby causing the reinforcing nail 32 to be inserted into the fixing hole 213, and then through the fixing hole 213 and inserted into the soil layer.

[0071] Reference Figure 2 The drive assembly 31 includes a telescopic member 311, a drive rod 312, and a mounting plate 313. In this embodiment, the telescopic member 311 is a cylinder. The telescopic member 311 is installed on the side of the limiting plate 22 away from the fixing nail 21. The output end of the telescopic member 311 passes through the limiting plate 22 and is hinged to one end of the drive rod 312 located in the fixing nail 21. The other end of the drive rod 312 is hinged to the center of the mounting plate 313 away from the nail head 211.

[0072] The internal space of the fixing nail 21 is a prismatic space. There are several mounting plates 313, which are evenly arranged along the axis of the fixing nail 21 from one end to the other end and are slidably connected to the inner wall of the fixing nail 21. Each mounting plate 313 is fixedly connected to a reinforcing nail 32 on the side near the fixing hole 213.

[0073] After the fixing nail 21 is inserted into the soil, the telescopic component 311 is activated, and the telescopic component 311 extends, driving the drive rod 312 to move downward. One end of the drive rod 312 is fixedly connected to the center of the mounting plate 313 away from the nail head 211. The mounting plate 313 slides within the fixing nail 21 in the radial direction of the fixing nail 21. In turn, the drive rod 312 pushes the mounting plate 313 away from the nail head 211 to slide in the radial direction of the fixing nail 21, causing the reinforcing nail 32 on the mounting plate 313 away from the nail head 211 to move towards the fixing hole 213 corresponding to itself.

[0074] Reference Figure 2 The linkage component 4 includes gears 41 and racks 42. There are four racks 42. Two racks 42 are installed on the side of adjacent mounting plates 313 that are close to each other. The two racks 42 are located at opposite ends of a mounting plate 313. One end of the rack 42 is fixedly connected to the mounting plate 313, and the other end of the rack 42 extends away from the reinforcing nail 32. There are two gears 41. The two gears 41 are rotatably connected to the inner wall of the fixing nail 21. One gear 41 is provided between every two adjacent racks 42, and the gear 41 meshes with the two racks 42.

[0075] When the mounting plate 313 away from the nail head 211 slides, it drives the rack 42 to move, which in turn causes the gear 41 to rotate. This causes the rack 42 on another mounting plate 313 to move radially along the fixing nail 21 following the rotation of the gear 41, thereby causing the adjacent mounting plate 313 to move, and thus causing the reinforcing nail 32 to move closer to the fixing hole 213.

[0076] The implementation principle of Embodiment 1 of this application is as follows: The side support plate 11 is tightly attached to the side wall of the deep foundation pit, and the bottom support plate 12 is tightly attached to the bottom wall of the deep foundation pit. Two fixing nails 21 are inserted into the soil layer through the mounting holes on the bottom support plate 12 and the side support plate 11, respectively. When the telescopic component 311 is opened, the mounting plate 313 away from the nail head 211 moves towards its corresponding fixing hole 213, thereby moving the rack 42, which in turn drives the gear 41 to rotate. This causes the rack 42 on the adjacent mounting plate 313 to move, which in turn moves the adjacent mounting plate 313, thus causing all the reinforcing nails 32 to move towards their corresponding fixing holes 213. When the reinforcing nail 32 contacts the guide slope 511, the two sealing blocks 51 move away from each other under the guidance of the guide slope 511, allowing the reinforcing nail 32 to pass through the fixing hole 213 and insert into the soil layer, thereby making the fixing nail 21 more securely installed.

[0077] This embodiment 1 also discloses a construction method for a deep foundation pit support device using the above-mentioned deep foundation pit support device:

[0078] S1: Leveling the site: Leveling the bottom and side walls of the deep foundation pit;

[0079] S2: Fixed point: Measurement and positioning to determine the location for installing support equipment;

[0080] S3: Press the bottom support plate 12 against the bottom wall of the deep foundation pit;

[0081] S4: Fix one end of the support rod 13 to the bottom support plate 12;

[0082] S5: Press the side support plate 11 against the side wall of the deep pit and fix it to the end of the drive rod 312 away from the bottom support plate 12;

[0083] S6: Two fixing nails 21 are inserted into the soil through the bottom support plate 12 and the side support plate 11 respectively;

[0084] S7: Open the expansion joint 311: Allow several reinforcing nails 32 to pass through the fixing holes 213 and be inserted into the soil layer.

[0085] Example 2: The difference between Example 2 and Example 1 is that the installation positions of several mounting plates 313 are different and the linkage components 4 are different.

[0086] Reference Figure 4Several mounting plates 313 are staggered in sequence along the circumferential direction of the fixing nail 21. A linkage assembly 4 is provided between adjacent mounting plates 313. The linkage assembly 4 includes fixed pulleys 43 and connecting ropes 44. Two fixed pulleys 43 are provided between adjacent mounting plates 313, symmetrically arranged about the central axis. Both fixed pulleys 43 are rotatably connected to the inner wall of the fixing nail 21. The connecting rope 44 is looped and sleeved on the two adjacent fixed pulleys 43. Two through holes are provided on the mounting plates 313, close to the central axis of the mounting plate 313. The connecting rope 44 passes through the through holes and is fixedly connected to the mounting plate 313.

[0087] The implementation principle of this embodiment 2 is as follows: when the mounting plate 313 away from the nail head 211 moves, it pulls the connecting rope 44 to move, and then the connecting rope 44 pulls the adjacent mounting plate 313 to move, thereby driving all the reinforcing nails 32 to move toward their corresponding fixing holes 213.

[0088] 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 deep foundation pit support device, comprising: The support device (1) and the fixing device (2) are characterized in that the support device (1) includes a side support plate (11) for supporting the side wall of the deep foundation pit, a bottom support plate (12) and a support rod (13) for connecting the side support plate (11) and the bottom support plate (12), one end of the support rod (13) is fixedly connected to the side support plate (11) and the other end of the support rod (13) is fixedly connected to the bottom support plate (12); The fixing device (2) includes a plurality of fixing nails (21) for inserting into the inner wall of the deep foundation pit, and at least one fixing nail (21) is provided through the side support plate (11) and the bottom support plate (12). The fixing nail (21) is hollow, and a fixing hole (213) is provided on the side wall of the fixing nail (21). A reinforcing mechanism (3) is provided inside the fixing nail (21). The reinforcing mechanism (3) includes a driving component (31) and a reinforcing nail (32). The reinforcing mechanism (3) can drive the reinforcing nail (32) through the fixing hole (213). The inner wall of the fixing nail (21) is equipped with a number of sealing components (5), and a sealing component (5) is provided at each of the fixing holes (213). The sealing assembly (5) includes a sealing block (51), an elastic element (52), and a fixing block (53), wherein there are two fixing blocks (53) and they are symmetrically arranged about the fixing hole (213); There are two blocking blocks (51), and both blocking blocks (51) are disposed between the two fixing blocks (53); The elastic element (52) is disposed between the sealing block (51) and the fixing block (53). One end of the elastic element (52) is fixedly connected to the sealing block (51), and the other end of the elastic element (52) is fixedly connected to the fixing block (53). The two fixing blocks (53) are provided with guide slopes (511) on the side that is close to each other.

2. The deep foundation pit support equipment according to claim 1, characterized in that, The drive assembly (31) includes a telescopic member (311), a drive rod (312), and a mounting plate (313). At least one telescopic member (311) is installed on both the side support plate (11) and the bottom support plate (12). Each fixing nail (21) corresponds to one telescopic member (311). The output end of the telescopic member (311) passes through the side support plate (11) or the bottom support plate (12) and is inserted into the corresponding fixing nail (21). One end of the drive rod (312) is hinged to the output end of the telescopic member (311), and the other end of the drive rod (312) is hinged to the mounting plate (313); The mounting plate (313) is slidably connected to the inner wall of the fixing nail (21), and the reinforcing nail (32) is fixedly connected to the side wall of the mounting plate (313).

3. The deep foundation pit support equipment according to claim 2, characterized in that, There are several fixing holes (213) and several reinforcing nails (32). Several reinforcing nails (32) are all arranged in the fixing nails (21). The fixing holes (213) and the reinforcing nails (32) are in one-to-one correspondence. There are several mounting plates (313), and each mounting plate (313) is slidably connected to the inner wall of the fixing nail (21). Each mounting plate (313) is fixedly connected to a reinforcing nail (32). A linkage component (4) is provided between adjacent mounting plates (313), and the linkage component (4) drives the reinforcing nail (32) through the fixing hole (213).

4. The deep foundation pit support equipment according to claim 3, characterized in that, The linkage assembly (4) includes a gear (41) and a rack (42). A gear (41) is provided between adjacent mounting plates (313), and the gear (41) is rotatably connected to the inner wall of the fixing nail (21); Two racks (42) are provided between adjacent mounting plates (313), one rack (42) is fixedly connected to one of the mounting plates (313), and the other rack (42) is fixedly connected to the other mounting plate (313); The gear (41) is disposed between adjacent racks (42) and meshes with both racks (42).

5. A deep foundation pit support device according to claim 3, characterized in that, The linkage assembly (4) includes a fixed pulley (43) and a connecting rope (44). Two fixed pulleys (43) are provided between adjacent mounting plates (313), and the two fixed pulleys (43) are symmetrically arranged about the central axis of the fixing nail (21); The connecting rope (44) is looped and sleeved on two adjacent fixed pulleys (43); The adjacent mounting plates (313) are all fixedly connected to the connecting rope (44).

6. The deep foundation pit support equipment according to claim 5, characterized in that, Each of the mounting plates (313) is provided with a through hole, the through hole being close to the central axis of the mounting plate (313); The connecting rope (44) passes through the perforation and is fixedly connected to the mounting plate (313).

7. The deep foundation pit support equipment according to claim 1, characterized in that, The guide slope (511) is an arc surface and is adapted to the shape of the nail tip of the reinforcing nail (32).

8. The deep foundation pit support equipment according to claim 1, characterized in that, The fixing nail (21) includes a nail head (211) and a nail body (212), and the nail head (211) is threadedly connected to the nail body (212).

9. A construction method for a deep foundation pit support system using the deep foundation pit support system described in any one of claims 1-8, characterized in that, Includes the following steps S1: Leveling the site: Leveling the bottom and side walls of the deep foundation pit; S2: Fixed point: Measurement and positioning to determine the location for installing support equipment; S3: Press the bottom support plate (12) against the bottom wall of the deep foundation pit; S4: Fix one end of the support rod (13) to the bottom support plate (12); S5: Press the side support plate (11) against the side wall of the deep pit and fix it to the end of the drive rod (312) away from the bottom support plate (12); S6: Two fixing nails (21) are inserted into the soil through the bottom support plate (12) and the side support plate (11), respectively; S7: Open the expansion joint (311): Insert several reinforcing nails (32) through the fixing holes (213) into the soil layer.

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