A foundation pit asymmetric excavation anti-deformation supporting device and a method for using the same

Abstract

The application belongs to the technical field of supporting devices, and particularly relates to a foundation pit asymmetric excavation anti-deformation supporting device and a use method thereof. The foundation pit asymmetric excavation anti-deformation supporting device comprises a foundation pit earthwork main body and soil filled in the foundation pit earthwork main body. A supporting assembly is arranged in the foundation pit earthwork main body. The supporting assembly can effectively resist the pressure from the peripheral soil of the foundation pit, prevent the side wall of the foundation pit from tilting or collapsing, and provide a safe environment for underground structure construction, so that construction accidents caused by the collapse of the foundation pit are avoided. The stability of the soil retaining plate is improved through the steel wire ring and the limiting bolt. The fixing pile can bear and transfer the load, so that the soil retaining plate is prevented from moving or tilting, and the anti-sliding performance of the whole structure is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of supporting devices, and particularly relates to a foundation pit asymmetric excavation anti-deformation supporting device and a use method thereof. BACKGROUND

[0002] At present, in order to solve the problem of urban land shortage and rationally utilize the space resources on the ground and underground, underground projects such as high-rise and super high-rise buildings, urban rail transit projects, underground shopping malls and parking lots are rapidly increasing, which leads to a large number of deep and large foundation pit projects. In the region where urban building facilities are dense and the geological environment is complex, the deformation caused by foundation pit excavation has an impact on and damages surrounding buildings and underground pipelines, leading to major economic losses and even casualties, and causing adverse social impacts. Therefore, it is very important to study the foundation pit asymmetric excavation anti-deformation supporting device;

[0003] Generally, indoor model tests combined with numerical simulation methods are used to reveal the deformation mechanism of the foundation pit asymmetric excavation adjacent to existing buildings or without buildings, and the deformation control effects of row piles, row piles with prestressed anchor cables and double-row piles on the foundation pit asymmetric excavation adjacent to existing buildings or without buildings under different supporting parameters are compared and analyzed. In more foundation pit asymmetric excavation constructions, vertical excavation is often used, which can make up for the problem of late settlement and save construction time. However, such a construction method faces safety problems. The vertical excavation of soil is very easy to lose stability, leading to the collapse of the foundation pit and causing safety accidents. Moreover, the supporting device cannot be monitored in real time to determine whether deformation or displacement occurs, which reduces the use effect of the device. SUMMARY

[0004] The application provides a foundation pit asymmetric excavation anti-deformation supporting device and a use method thereof, which can effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a foundation pit asymmetric excavation anti-deformation supporting device, the foundation pit is in a non-symmetrical structure in plan view, and comprises a foundation pit earthwork main body and soil filled in the inside of the foundation pit earthwork main body.

[0006] A supporting assembly is installed in the inside of the foundation pit earthwork main body, the supporting assembly comprises fixed piles inserted into the soil for supporting, soil retaining plates connected with the fixed piles for retaining soil, anchor rods inserted into the soil, lock bolts one, wire rings and limit bolts, and a plurality of fixed piles are arranged at intervals; a ramming pile is further arranged on the outside of the fixed pile, and the ramming pile is arranged on the central axis between adjacent fixed piles.

[0007] A monitoring assembly is installed on the supporting assembly, and the monitoring assembly comprises a positioning rectangular block, a positioning inclined block one, a positioning inclined block two, a strip-shaped plate, a connecting wire, a laser range finder, a rope, a shell cover, a contact switch, a touch block and a fixed block.

[0008] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the inside of the foundation pit earthwork body is provided with multiple groups of closing design retaining board, the side of the retaining board is provided with multiple groups of equidistantly arranged fixed stake, the anchor rod is arranged between two groups of the fixed stake, the surface of the retaining board is provided with lock bolt one with anchor rod screw connection on the side close to anchor rod, the surface of the fixed stake is provided with steel wire ring around on the side close to retaining board, the one end of the steel wire ring is fixed with limit block, and limit block penetrates retaining board, and is connected with limit bolt arranged on the side of the retaining board.

[0009] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the one end of the anchor rod is provided with symmetrically arranged installation slot, the inside of the installation slot is provided with expansion plate, the expansion plate is rotatably connected with anchor rod through pivot, and the surface of the expansion plate is fixed with multiple groups of equidistantly arranged anti-tooth plate.

[0010] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the anchor rod is inserted into soil inside with downward inclination, the outer surface of the expansion plate is in the same horizontal plane with anchor rod, and multiple groups of the anti-tooth plate are sequentially arranged in inclined structure.

[0011] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the upper surface of the retaining board is fixed with clamping plate, and the lower surface of the retaining board is provided with clamping groove matched with clamping plate.

[0012] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the surface of the retaining board in the uppermost position is fixed with positioning rectangular block, the two sides of the positioning rectangular block are respectively fixed with positioning inclined block two and positioning inclined block one, the upper surface of the foundation pit earthwork body is respectively fixed with strip plate on the side close to positioning rectangular block, positioning inclined block one and positioning inclined block two, one end of the strip plate is provided with laser range finder, one end of the laser range finder is fixed with connecting line, the surface of the retaining board is respectively fixed with shell cover and fixed block at both ends, the inside of the shell cover is fixed with contact switch, one side of the contact switch is provided with touch block, the spring in symmetric arrangement is fixed between the touch block and shell cover, and one end of the touch block is fixed with rope.

[0013] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the contact switch and touch block are closely attached, the length of the rope is matched with the length of the retaining board, and is attached to the surface of the retaining board.

[0014] As a kind of foundation pit asymmetric excavation anti-deformation supporting device, preferably, the side close to spring between the touch block and shell cover is fixed with telescopic rod.

[0015] Preferably, the upper surface of the strip-shaped plate is fixed with a wire sleeve through a supporting plate, and the connecting wire is located inside the wire sleeve.

[0016] The application also provides a use method of the deformation prevention supporting device for asymmetric excavation of a foundation pit, which comprises the following steps:

[0017] S1, compacting soil inside a main body of earthwork of the foundation pit;

[0018] S2, marking and positioning the positions of the fixed piles and the rammed piles according to design drawings, and then ramming the rammed piles into the soil one by one;

[0019] S3, vibrating the soil for 1-3 hours;

[0020] S4, ramming the fixed piles into the soil according to the marking and positioning;

[0021] S5, excavating the soil inside a closed contour formed by the fixed piles, drilling a hole according to the specified position between the two groups of fixed piles by using a drilling machine, then drilling the hole, then putting an anchor rod into the hole and then grouting;

[0022] S6, disassembling the wire ring, winding one end of the wire ring around one circle of the fixed pile, and locking the two ends of the wire ring through the limiting blocks;

[0023] S7, installing the soil retaining plate on the groups of anchor rods through the locking bolt one, passing the limiting blocks through the soil retaining plate, and then locking the limiting blocks through the limiting bolts;

[0024] S8, installing the strip-shaped plates on the main body of earthwork of the foundation pit, respectively corresponding the positioning rectangular blocks, the positioning inclined blocks one and the positioning inclined blocks two through the laser range finders on the groups of strip-shaped plates, then installing the shell cover and the fixed blocks on two ends of the soil retaining plate, fixing one end of the rope to the touch block inside the shell cover, and fixing the other end of the rope to the fixed block;

[0025] S9, continuing to excavate the soil, the excavation depth being greater than the height of the soil retaining plate, and then installing the soil retaining plate;

[0026] S10, repeating steps S5 to S9;

[0027] S11, until the depth meets the requirements of the drawings.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] The supporting assembly is provided with a fixed pile, an earth retaining plate, an anchor rod, a locking bolt, a steel wire ring, a limiting bolt, a clamping plate, a clamping groove, an expansion plate, a tooth prevention plate and a mounting groove, which can effectively resist the pressure from the soil outside the foundation pit, prevent the asymmetric foundation pit sidewall from tilting or collapsing, and provide a safe environment for underground structure construction, avoid construction accidents caused by asymmetric foundation pit collapse, increase the stability of the earth retaining plate through the steel wire ring and the limiting bolt, the fixed pile can bear and transfer the load to prevent the earth retaining plate from moving or tilting, thereby improving the anti-skid performance of the whole structure, and can help to disperse the pressure, the fixed pile can bear and distribute the pressure from the earth retaining plate, reduce the single-point pressure, improve the overall load-carrying capacity of the structure, and can be better supported and protected, prolonging the service life;

[0030] The expansion plate, the tooth prevention plate and the mounting groove are used in cooperation to further increase the resistance effect, increase the fixing effect of the anchor rod, meet the actual demand, and have better use effect;

[0031] The monitoring assembly is provided with a positioning rectangular block, a positioning inclined block one, a positioning inclined block two, a strip-shaped plate, a connecting line, a laser range finder, a rope, a shell cover, a contact switch, a touch block and a fixing block, which are used in cooperation to monitor the instability of the foundation pit wall or the deformation of the earth retaining plate in real time, so that potential safety hazards can be found in time to avoid safety accidents, the construction scheme can be adjusted and optimized, for example, the supporting mode or reinforcement measures of the earth retaining plate are changed to improve the construction efficiency and effect, the state of the earth retaining plate can be accurately mastered, unnecessary reinforcement and maintenance work is reduced, the construction cost is reduced, and the use effect of the device is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The application is applied to the schematic diagram;

[0033] Figure 2 The application is applied to the structural schematic diagram of the connecting pieces such as the fixed pile and the earth retaining plate;

[0034] Figure 3 The application is applied to the enlarged structural schematic diagram of A in Figure 2 ;

[0035] Figure 4 The application is applied to the structural schematic diagram of the connecting pieces such as the fixed pile and the anchor rod;

[0036] Figure 5 The application is applied to the enlarged structural schematic diagram of B in Figure 4 ;

[0037] Figure 6 The application is applied to the structural schematic diagram of the connecting pieces such as the limiting bolt and the clamping plate;

[0038] Figure 7 The application is Figure 6 The amplification structure schematic diagram of C in the application;

[0039] Figure 8 The structure section view of the lead sleeve in the application;

[0040] Figure 9 The layout top view of the fixed pile and the rammed pile;

[0041] Figure 10 The structure schematic diagram of the application.

[0042] In the figure: 1, the main body of the foundation pit earthwork; 2, the soil; 3, the supporting assembly; 301, the fixed pile; 302, the retaining board; 303, the anchor rod; 304, the locking bolt one; 305, the steel wire ring; 306, the limiting bolt; 307, the clamping plate; 308, the clamping groove; 309, the expansion plate; 310, the anti-tooth plate; 311, the installation groove; 312, the rammed pile; 4, the monitoring assembly; 401, the positioning rectangular block; 402, the positioning inclined block one; 403, the positioning inclined block two; 404, the strip plate; 405, the lead sleeve; 406, the connecting wire; 407, the laser range finder; 408, the rope; 409, the shell cover; 410, the contact switch; 411, the touch block; 412, the telescopic rod; 413, the fixed block; 414, the spring. DETAILED DESCRIPTION

[0043] EMBODIMENT

[0044] As Figures 1-10 shown, a foundation pit asymmetric excavation anti-deformation supporting device, the foundation pit is asymmetrically structured in top view, including the main body of the foundation pit earthwork 1 and the soil 2 filled in the main body of the foundation pit earthwork 1, the fixed pile 301 is further provided with the rammed pile 312 outside, and the rammed pile 312 is arranged on the central axis of the adjacent fixed pile 301.

[0045] The foundation pit earthwork main body 1 is internally provided with a supporting assembly 3, the supporting assembly 3 comprises a fixing pile 301, a soil retaining plate 302, an anchor rod 303, a locking bolt one 304, a steel wire ring 305, a limiting bolt 306, a clamping plate 307, a clamping groove 308, an expansion plate 309, a toothproof plate 310 and a mounting groove 311, a plurality of groups of the soil retaining plate 302 in a closed design are arranged in the foundation pit earthwork main body 1, a plurality of groups of the fixing pile 301 arranged at equal intervals are arranged on one side of the soil retaining plate 302, the anchor rod 303 is arranged between the two groups of the fixing pile 301, the locking bolt one 304 in threaded connection with the anchor rod 303 is arranged on the side of the surface of the soil retaining plate 302 close to the anchor rod 303, and the anchor rod 303 and the soil retaining plate 302 are connected through the locking bolt one 304;

[0046] The mounting groove 311 in a symmetrical arrangement is formed in one end of the anchor rod 303, the expansion plate 309 is arranged in the mounting groove 311, the expansion plate 309 is rotationally connected with the anchor rod 303 through a rotating shaft, a plurality of groups of the toothproof plate 310 arranged at equal intervals are fixed on the surface of the expansion plate 309, the anchor rod 303 is in an inclined state and penetrates into the inside of the soil 2, the outer surface of the expansion plate 309 is in the same horizontal plane as the anchor rod 303, a plurality of groups of the toothproof plate 310 are arranged in an orderly inclined structure, the clamping plate 307 is fixed on the upper surface of the soil retaining plate 302, and the clamping groove 308 matched with the clamping plate 307 is formed in the lower surface of the soil retaining plate 302.

[0047] The supporting assembly 3 is provided with a monitoring assembly 4 in the embodiment. The monitoring assembly 4 comprises a positioning rectangular block 401, a positioning inclined block one 402, a positioning inclined block two 403, a strip-shaped plate 404, a wire sleeve 405, a connecting wire 406, a laser range finder 407, a rope 408, a shell cover 409, a contact switch 410, a touch block 411, an extension rod 412, a fixed block 413 and a spring 414. The positioning rectangular block 401 is fixed on the surface of the uppermost soil retaining board 302. The positioning inclined block two 403 and the positioning inclined block one 402 are respectively fixed on the two sides of the positioning rectangular block 401. The strip-shaped plate 404 is respectively fixed on the upper surface of the foundation pit earth body 1 near the positioning rectangular block 401, the positioning inclined block one 402 and the positioning inclined block two 403. One end of the strip-shaped plate 404 is provided with the laser range finder 407. One end of the laser range finder 407 is fixed with the connecting wire 406. The shell cover 409 and the fixed block 413 are respectively fixed on the surface of the soil retaining board 302. The contact switch 410 is fixed in the shell cover 409. The touch block 411 is arranged on one side of the contact switch 410. The springs 414 arranged in symmetry are fixed between the touch block 411 and the shell cover 409. One end of the touch block 411 is fixed with the rope 408. One end of the rope 408 penetrates through the shell cover 409 and is fixedly connected with the surface of the fixed block 413. The contact switch 410 and the touch block 411 are closely attached. The length of the rope 408 is adapted to the length of the soil retaining board 302 and is attached with the surface of the soil retaining board 302. The extension rod 412 is fixed on one side between the touch block 411 and the shell cover 409 near the spring 414. The spring 414 is arranged on the surface of the extension rod 412. The wire sleeve 405 is fixed on the upper surface of the strip-shaped plate 404 through a supporting plate. The connecting wire 406 is located in the wire sleeve 405.

[0048] In the embodiment: the one kind asymmetric excavation deformation prevention supporting device of foundation pit, when using, first compacts the soil 2 inside the earthwork main body 1, then according to the design of drawing, multiple groups of fixed piles 301 are punched into the inside of soil 2 using equipment, which can stabilize the soil and ensure the safety of later construction, then the soil 2 in the closed contour formed by the fixed pile 301 is excavated, as the soil 2 continuously moves down, the fixed pile 301 is continuously exposed, until the fixed pile 301 is exposed to a certain height, then a drill rig (not shown in the figure) is used to drill a hole according to the specified position between the two fixed piles 301, the hole is drilled in an inclined state, then the anchor rod 303 is placed in the hole, at this time the anchor rod 303 is in an inclined structure state, which is inclined into the soil 2, can better combine with the soil 2, improve its pullout capacity, increase the overall stability of the structure, and can more fully utilize the bearing capacity of the soil 2, improve the anchoring effect, at the same time, compared with vertical punching, the inclined punching anchor rod 303 is easier to construct, especially in the case of complex geological conditions, further improves the use effect of the device. The ramming pile 312 is arranged outside the fixed pile 301, after the excavation of the foundation pit, the soil 2 has a tendency to slide into the foundation pit, the ramming pile 312 on the one hand compacts and reinforces the soil 2, on the other hand first bears and disperses the horizontal force of the soil 2 sliding tendency, reduces the horizontal force of the fixed pile 301 bearing the soil 2 sliding tendency, and the foundation pit is more stable.

[0049] Then the soil retaining plate 302 is installed on multiple anchor rods 303 by locking bolt one 304, as the anchor rod 303 is inserted, the setting of the tooth protection plate 310 at this time can increase the resistance, when the lateral pressure of the soil 2 extrudes the soil retaining plate 302, the soil retaining plate 302 pulls the anchor rod 303 at this time, the expansion plate 309 is expanded by a certain angle through the shaft (not shown in the figure) under the action of the tooth protection plate 310, thereby further increasing the resistance effect, increasing the fixing effect of the anchor rod 303, meeting the actual demand;

[0050] The anchor rod 303 is placed in the drilled hole, and then grouting is carried out to reinforce the stability of the anchor rod 303. Before the installation of the retaining plate 302, the steel wire ring 305 is disassembled and wound around a circle of the fixed pile 301 at one end, and the two ends are locked by the limiting block. When the retaining plate 302 is installed, the limiting block is passed through the retaining plate 302 and locked by the limiting bolt 306. By being able to fix the retaining plate 302 and the anchor rod 303 at the same time, the connection between the retaining plate 302 and the fixed pile 301 is locked, which can increase the stability of the retaining plate 302. The fixed pile 301 can bear and transfer the load, prevent the retaining plate 302 from moving or tilting, thereby improving the anti-sliding performance of the entire structure, and can help to disperse the pressure. The fixed pile 301 can bear and distribute the pressure from the retaining plate 302, reduce the single-point pressure, improve the overall load-carrying capacity of the structure, and also get better support and protection, prolong its service life. Then the soil 2 is continuously excavated, and the fixed pile 301 is exposed again at a certain distance, and the operation is repeated to install the retaining plate 302. Through the support of the retaining plate 302, the pressure from the surrounding soil 2 of the foundation pit can be effectively resisted, and the side wall of the foundation pit can be prevented from collapsing or collapsing. At the same time, a safe environment can be provided for underground structure construction, avoiding construction accidents caused by foundation pit collapse;

[0051] When installing the upper and lower groups of retaining plates 302, the clamping plate 307 of the lower retaining plate 302 is inserted into the clamping groove 308 of the top retaining plate 302 to complete the mutual splicing between the two groups of retaining plates 302. Through splicing, the fixing effect of the supporting structure is improved, the soil collapse around the foundation pit is prevented, the life safety of construction personnel during asymmetric foundation pit excavation is ensured, and the risk of supporting structure instability caused by failure of a single retaining plate 302 is reduced;

[0052] When the first set of retaining plates 302 is installed, the strip plate 404 is installed on the foundation pit earth main body 1, at this time the laser range finder 407 on the plurality of strip plates 404 corresponds to the positioning rectangular block 401, the positioning inclined block one 402 and the positioning inclined block two 403 respectively, when the laser range finder 407 at the top of the positioning inclined block two 403 appears a setting change, at this time the retaining plate 302 is towards the center position of the foundation pit, when the laser range finder 407 at the top of the positioning rectangular block 401 vertically changes, at this time the foundation pit appears a subsidence, when the laser range finder 407 on the positioning inclined block one 402 changes, the retaining plate 302 appears a transverse displacement, when the retaining plate 302 appears an outward deformation, at this time the retaining plate 302 bulges outward and pulls the rope 408, the rope 408 drives the touch block 411 to move, so that the touch block 411 compresses the spring 414 and the telescopic rod 412, through the setting of the telescopic rod 412, the stability of the movement of the touch block 411 can be increased, at the same time the touch block 411 is separated from the contact switch 410, at this time the contact switch 410 alerts the external alarm (not shown in the figure) to provide an alert effect for the workers, through this operation, the instability of the foundation pit wall or the deformation of the retaining plate 302 can be monitored in real time, so that potential safety hazards can be found in time to avoid safety accidents caused thereby, the construction scheme can be adjusted and optimized, for example, the supporting mode or reinforcement measures of the retaining plate 302 are changed to improve the construction efficiency and effect, at the same time the state of the retaining plate 302 can be accurately mastered to reduce unnecessary reinforcement and maintenance work, thereby reducing the construction cost and further improving the use effect of the device.

[0053] The connecting line 406 on the laser range finder 407 is protected by the wire sleeve 405, so that the connecting line 406 can be effectively prevented from being damaged and prevented from being electrified to reduce the safety risk of the construction site.

[0054] It should be noted that the positioning inclined block one 402 and the positioning inclined block two 403 are designed in an inclined structure, the laser range finder 407 is mainly based on the propagation speed and time measurement of laser, when working, the laser range finder 407 emits a beam of laser, then measures the time of the laser from emission to reflection by the target, calculates the round-trip time of the laser through the known speed of light, and thus obtains the distance, the specific model can be selected according to the use demand.

[0055] The use method of the foundation pit asymmetric excavation anti-deformation supporting device includes the following steps:

[0056] S1, first compact the soil 2 inside the foundation pit earth main body 1;

[0057] S2, according to the design drawing, mark and position the positions of the fixed pile 301 and the ramming pile 312, and then the ramming pile 312 is sequentially driven into the soil 2 inside;

[0058] S3, vibrate the soil 2 for 1-3 hours;

[0059] S4, fixed pile 301 is punched into the interior of the soil 2 according to the position of the dashed line;

[0060] S5, the soil 2 in the closed contour formed by the fixed pile 301 is excavated, the drill hole is found according to the specified position between the two groups of fixed piles 301 by using the drilling machine, then the anchor rod 303 is put into the drill hole and grouting is carried out;

[0061] S6, the steel wire ring 305 is disassembled, one end is wound around the fixed pile 301, and the two ends are locked by the limiting block;

[0062] S7, the retaining plate 302 is installed on the plurality of anchor rods 303 by locking the bolts 304, the limiting block is passed through the retaining plate 302, and the limiting bolt 306 is locked;

[0063] S8, the strip plate 404 is installed on the main body of the foundation pit 1, the laser range finder 407 on the plurality of strip plates 404 respectively corresponds to the positioning rectangular block 401, the positioning inclined block one 402 and the positioning inclined block two 403, then the shell cover 409 and the fixed block 413 are installed on one side of the retaining plate 302, one end of the rope 408 is fixedly connected with the touch block 411 inside the shell cover 409, the other end of the rope 408 is fixedly connected with the fixed block 413, when the laser range finder 407 on the top of the positioning inclined block two 403 changes, the retaining plate 302 moves to the center of the foundation pit, when the laser range finder 407 on the top of the positioning rectangular block 401 changes vertically, the foundation pit sinks, when the laser range finder 407 on the positioning inclined block one 402 changes, the retaining plate 302 moves horizontally, when the retaining plate 302 deforms outward, the retaining plate 302 protrudes outward and pulls the rope 408, the touch block 411 moves and compresses the spring 414 and the telescopic rod 412, the telescopic rod 412 increases the stability of the movement of the touch block 411, the touch block 411 separates from the contact switch 410, the contact switch 410 sends an external alarm, and the alarm reminds personnel;

[0064] S9, continue to excavate the soil 2, the excavation depth is greater than the height of the retaining plate 302, and the retaining plate 302 is installed;

[0065] S10, repeat steps S5 to S9;

[0066] S11, until the depth meets the requirements of the drawing.

Claims

1. A foundation pit asymmetric excavation deformation prevention supporting device, the foundation pit is asymmetric in plan view, comprising a foundation pit earthwork main body (1) and soil (2) filled in the inside of the foundation pit earthwork main body (1); characterized in that A supporting assembly (3) is installed in the inside of the foundation pit earthwork main body (1), the supporting assembly (3) comprises fixed piles (301) inserted into the soil (2) for supporting, soil retaining plates (302) connected with the fixed piles (301) for retaining soil, anchor rods (303) inserted into the soil (2), lock bolts one (304), steel wire rings (305) and limiting bolts (306), a plurality of fixed piles (301) are arranged at intervals; a ramming pile (312) is further arranged outside the fixed pile (301), and the ramming pile (312) is arranged on the central axis between adjacent fixed piles (301); A monitoring assembly (4) is installed on the supporting assembly (3), the monitoring assembly (4) comprises a positioning rectangular block (401), a positioning inclined block one (402), a positioning inclined block two (403), a strip-shaped plate (404), a connecting line (406), a laser range finder (407), a rope (408), a shell cover (409), a contact switch (410), a touch block (411) and a fixed block (413); A plurality of groups of soil retaining plates (302) in closed design are arranged in the inside of the foundation pit earthwork main body (1), a plurality of groups of fixed piles (301) are arranged on one side of the soil retaining plate (302) at equal intervals, an anchor rod (303) is arranged between two groups of fixed piles (301), a lock bolt one (304) is arranged on the side of the surface of the soil retaining plate (302) close to the anchor rod (303) and is threadedly connected with the anchor rod (303), a steel wire ring (305) is arranged around the side of the surface of the fixed pile (301) close to the soil retaining plate (302), one end of the steel wire ring (305) is fixed with a limiting block, the limiting block penetrates through the soil retaining plate (302) and is connected with a limiting bolt (306) arranged on one side of the soil retaining plate (302); The upper surface of the retaining board (302) is fixed with a clamping plate (307), and the lower surface of the retaining board (302) is provided with a clamping groove (308) matched with the clamping plate (307); the surface of the uppermost retaining board (302) is fixed with a positioning rectangular block (401), and the two sides of the positioning rectangular block (401) are respectively fixed with a positioning inclined block two (403) and a positioning inclined block one (402); the upper surface of the foundation pit earth main body (1) is respectively fixed and installed with a strip-shaped plate (404) near one side of the positioning rectangular block (401), the positioning inclined block one (402) and the positioning inclined block two (403); one end of the strip-shaped plate (404) is installed with a laser range finder (407), one end of the laser range finder (407) is fixed with a connecting line (406), and the surfaces of the retaining board (302) are respectively fixed with a shell cover (409) and a fixed block (413); the inside of the shell cover (409) is fixed with a contact switch (410), one side of the contact switch (410) is provided with a touch block (411), the touch block (411) and the shell cover (409) are fixed with springs (414) arranged in symmetry therebetween, one end of the touch block (411) is fixed with a rope (408), and the other end of the rope (408) is fixedly connected with the fixed block; the contact switch (410) and the touch block (411) are closely attached, the length of the rope (408) is matched with the length of the retaining board (302), and the rope (408) is attached to the surface of the retaining board (302); the side near the spring (414) between the touch block (411) and the shell cover (409) is fixed with an extension rod (412); the upper surface of the strip-shaped plate (404) is fixed with a wire sleeve (405) through a supporting plate, and the connecting line (406) is located in the inside of the wire sleeve (405).

2. The asymmetric excavation deformation prevention support device for foundation pit according to claim 1, characterized in that: The one end of the anchor rod (303) is provided with the mounting groove (311) arranged in symmetry, the inside of the mounting groove (311) is provided with the expansion plate (309), the expansion plate (309) is rotationally connected with the anchor rod (303) through a rotating shaft, and the surface of the expansion plate (309) is fixed with a plurality of groups of equidistantly arranged anti-tooth plates (310).

3. The asymmetric excavation deformation prevention support device for foundation pit according to claim 2, characterized in that: The anchor rod (303) is downwardly and obliquely inserted into the soil (2), the outer surface of the expansion plate (309) is in the same plane with the outer surface of the anchor rod (303), and a plurality of groups of the anti-tooth plates (310) are sequentially arranged in an inclined structure.

4. The method of using the asymmetric excavation deformation-resistant support device for foundation pits according to any one of claims 1-3, characterized in that: The method comprises the following steps: S1, compacting the soil (2) in the foundation pit earth main body (1); S2, marking and positioning the positions of the fixed pile (301) and the ramming pile (312) according to the design drawing, and sequentially driving the ramming pile (312) into the soil (2); S3, vibrating the soil (2) for 1-3 hours; S4, driving the fixed pile (301) into the soil (2) according to the marking and positioning. S5, the soil (2) formed in the closed contour of the fixed pile (301) is excavated, the drill hole is found according to the specified position between the two groups of fixed piles (301) by using the drilling machine, then the anchor rod (303) is put into the drill hole, and then grouting is carried out; S6, the steel wire ring (305) is disassembled, one end of the steel wire ring (305) is wound around a circle of the fixed pile (301), and the other end of the steel wire ring (305) is locked through the limiting block; S7, the retaining plate (302) is installed on the plurality of anchor rods (303) through the locking bolt one (304), the limiting block passes through the retaining plate (302), and the limiting block is limited and locked through the limiting bolt (306); S8, the strip plate (404) is installed on the foundation pit earthwork main body (1), the laser range finder (407) on the plurality of strip plates (404) correspond to the positioning rectangular block (401), the positioning inclined block one (402) and the positioning inclined block two (403) respectively, then the shell cover (409) and the fixed block (413) are installed on one side of the retaining plate (302) at both ends, one end of the rope (408) is fixedly connected with the touch block (411) in the shell cover (409), and the other end of the rope (408) is fixedly connected with the fixed block (413); S9, continue to excavate the soil (2), the excavation depth is greater than the height of the retaining plate (302), and the retaining plate (302) is installed; S10, repeat steps S5 to S9; S11, until the depth meets the requirements of the drawing.

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