Deep foundation pit supporting structure and construction method thereof

Abstract

The invention discloses a deep foundation pit supporting structure and a construction method thereof, and belongs to the technical field of deep foundation pit supporting, the deep foundation pit supporting structure comprises a plurality of supporting plates arranged in a deep foundation pit, the multiple supporting plates define a square frame shape, the supporting plates are attached to the side faces, close to each other, of the deep foundation pit, and mounting rods are fixed to the side faces, away from the deep foundation pit, of the supporting plates; a plurality of driving pipes penetrate through the side face of the mounting rod, ejector rods are inserted into the two ends of each driving pipe, the end faces, away from the driving pipes, of the ejector rods abut against the side faces of the adjacent supporting plates, the ejector rods are in threaded connection with the driving pipes, and a driving mechanism used for driving the driving pipes to rotate at the same time is arranged on the mounting rod. A limiting assembly used for limiting the ejector rod to rotate along with the driving pipe is arranged on the supporting plate. The supporting device has the effect that the supporting plate can be conveniently mounted and dismounted.

Description

Technical Field

[0001] The invention relates to the field of deep foundation pit support technology, and in particular to a deep foundation pit support structure and a construction method thereof. Background Art

[0002] Deep foundation pit support refers to the support, reinforcement and protection measures for the side walls of deep foundation pits and the surrounding environment to ensure the practicality of underground structures and the safety of the surrounding environment of the foundation pit. Deep foundation pit support is an important structure to ensure the safety of deep foundation pit operations, which is directly related to the safety of the project and the personal safety of related operators.

[0003] In the related art, a Chinese invention patent with announcement number CN118441711A discloses a deep foundation pit support structure and a construction method thereof, including a support plate and a plug-in tube, the plug-in tube is connected to the support plate, a avoidance hole is opened through the tube wall of the plug-in tube, the plug-in tube is connected to a reinforcement component, the reinforcement component includes a connecting sleeve, a telescopic sleeve and an earth-breaking piece, the connecting sleeve is connected to the plug-in tube and is located in the inner cavity of the plug-in tube, the inner cavity of the connecting sleeve is communicated with the avoidance hole, the telescopic sleeve is slidably connected to the connecting sleeve and is located in the inner cavity of the connecting sleeve, the earth-breaking piece is slidably connected to the telescopic sleeve and is located in the inner cavity of the telescopic sleeve, the earth-breaking piece has a pointed end, and the telescopic sleeve is connected to a sealing bag made of flexible material, the sealing bag is extended along the length direction of the plug-in tube and the end portion extends out of the plug-in tube.

[0004] In the above-mentioned related technologies, when installing the support structure, it is necessary to insert the plug-in tube into the foundation pit wall, and then introduce high-pressure gas from the end of the sealing bag. The high-pressure gas applies force to the earth-breaking piece in the telescopic sleeve, and the earth-breaking piece slides out of the telescopic sleeve and is inserted into the soil. As the high-pressure gas continues to be introduced, the earth-breaking piece drives the telescopic sleeve to slide out of the connecting sleeve, so that the earth-breaking piece and the telescopic sleeve that are connected are inserted into the soil, forming a vertical limit on the plug-in tube inside the soil, thereby improving the connection strength between the plug-in tube and the foundation pit wall, thereby making the installation of the support plate on the foundation pit wall more cumbersome, and inconvenient to install and disassemble the support plate. Summary of the invention

[0005] In order to improve the problem of complicated installation and disassembly of support plates when supporting a deep foundation pit, the present application provides a deep foundation pit support structure and a construction method thereof.

[0006] In the first aspect, the present application provides a deep foundation pit support structure adopting the following technical solution: A deep foundation pit support structure comprises a plurality of support plates arranged in the deep foundation pit, wherein the plurality of support plates enclose a square frame, the support plates fit closely to the sides of the deep foundation pit, a mounting rod is fixed to the side of the support plate away from the deep foundation pit, a plurality of drive tubes are passed through the side of the mounting rod, a push rod is inserted at both ends of the drive tube, the end surface of the push rod away from the drive tube abuts against the side of the adjacent support plate, the push rod is threadedly connected to the drive tube, a driving mechanism for simultaneously driving the plurality of drive tubes to rotate is arranged on the mounting rod, and a limit assembly for limiting the push rod to follow the rotation of the drive tube is arranged on the support plate.

[0007] By adopting the above technical scheme, when it is necessary to support a deep foundation pit, multiple support plates are placed in the foundation pit respectively, so that the sides of the multiple support plates away from the installation rods are respectively in contact with the four inner walls of the deep foundation pit, and then the multiple driving tubes are driven to rotate simultaneously by the driving mechanism, so that the driving tube drives the top rods at both ends of the driving tube to move in directions away from each other, so that the end of the top rod away from the driving tube is tightly abutted against the side of the adjacent support plate, thereby pressing the support plate against the inner wall of the deep foundation pit to support the deep foundation pit, making it easier to install the support plate to support the inner wall of the deep foundation pit, and thus facilitating the installation and removal of the support plate.

[0008] Preferably, a cavity is provided in the mounting rod, and the driving mechanism includes a pulley arranged on the driving tube, and a transmission belt is wound around the outer circumferential surface of two adjacent pulleys, and a bevel gear 1 is provided on one of the driving tubes, and a rotating shaft is passed through the side of the mounting rod away from the support plate, and the rotating shaft is rotatably connected to the mounting rod, and a bevel gear 2 is provided at one end of the rotating shaft, and the bevel gear 1 is meshed with the bevel gear 2, and a rotating handle is provided at the other end of the rotating shaft.

[0009] By adopting the above technical scheme, when multiple support plates are placed in the deep foundation pit, each support plate is respectively fitted with the four inner walls of the deep foundation pit, and then the handle is rotated, the handle drives the rotating shaft to rotate, the rotating shaft drives bevel gear 2 to rotate, bevel gear 2 drives bevel gear 1 to rotate, bevel gear 1 drives one of the driving tubes to rotate, the driving tube drives the pulley on the driving tube to rotate, the pulley drives the transmission belt to rotate, and the transmission belt drives the pulley on the adjacent driving tube to rotate, so that multiple driving tubes rotate at the same time, and the driving tube drives the push rods at both ends of the driving tube to move in the direction away from the driving tube, so that the end face of the push rod away from the driving tube abuts against the side of the adjacent support plate, and then the support plate is pressed tightly against the inner wall of the deep foundation pit.

[0010] Preferably, the limiting assembly includes a limiting block fixed on the outer peripheral surface of the push rod, and a plurality of limiting grooves are provided on both sides of the side of the supporting plate, the plurality of limiting grooves correspond to the plurality of driving tubes, and the limiting block is slidably arranged in the limiting grooves.

[0011] By adopting the above technical solution, when the driving tube rotates to drive the push rods at both ends of the driving tube to move toward the direction close to the adjacent support plate, the limit block on the push rod moves in the limit groove on the limit rod, thereby reducing the possibility of the push rod following the rotation of the driving tube.

[0012] Preferably, mounting plates are provided on both sides of the support plate away from the top of the side surface of the inner wall of the deep foundation pit, an infrared sensor for detecting the movement of the support plate is provided on the mounting plate, a controller is provided on the mounting plate, an alarm light is provided on the top surface of the support plate, the output end of the infrared sensor is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the control end of the alarm light.

[0013] By adopting the above technical solution, infrared sensors are set on the support plates to monitor the adjacent support plates in real time. When the inner wall of the deep foundation pit collapses, the collapsed soil pushes the support plate to move. When the infrared sensor detects the movement of the support plate, the signal monitored by the infrared sensor is transmitted to the controller. The controller controls the alarm light to sound an alarm, thereby reminding the workers working in the deep foundation pit that there is a risk of collapse of the deep foundation pit, facilitating the timely evacuation of the workers and reducing the possibility of safety accidents.

[0014] Preferably, a mounting block is provided on the side of the mounting plate away from the support plate, a through groove is opened on the side of the mounting block, a moving rod is provided in the through groove, an end face of the moving rod away from the mounting rod is abutted against the side of the support plate opposite to the moving rod, and the infrared sensor is located on the side of the mounting block close to the mounting rod.

[0015] By adopting the above technical solution, the end face of the moving rod away from the mounting rod is abutted against the side face of the adjacent support plate. When the inner wall of the deep foundation pit collapses, the collapsed soil pushes the support plate to move, and the support plate pushes the moving rod to move. When the moving rod moves to the monitoring position of the infrared sensor at one end close to the mounting rod, the infrared sensor device signal is transmitted to the controller, thereby causing the controller to control the alarm light to sound an alarm.

[0016] Preferably, an annular groove is opened in the through groove, and a limiting plate is arranged on the movable rod, and the outer circumferential surface of the limiting plate is fitted with the inner circumferential surface of the annular groove. A spring is arranged on the movable rod, and one end of the spring abuts against the side surface of the limiting plate close to the mounting rod, and the other end of the spring abuts against the inner side surface of the annular groove close to the mounting rod.

[0017] By adopting the above technical solution, the limit plate is driven to move in the direction away from the mounting rod under the elastic force of the spring, so that the limit plate drives the moving rod to move in the direction away from the mounting rod, so that the end of the moving rod away from the mounting rod is always in contact with the side of the adjacent support plate.

[0018] Preferably, wedge-shaped grooves are provided on both sides of the support plate away from the top of the inner wall side of the deep foundation pit, and a wedge-shaped block is provided on the side of the mounting plate away from the mounting block. The wedge-shaped block is slidably set in the wedge-shaped groove, and a connecting rod is fixed to the bottom surface of the mounting block, and the bottom surface of the connecting rod is fixed to the outer peripheral surface of the top rod.

[0019] By adopting the above technical solution, when the driving tube rotates to drive the push rod to move toward the direction close to the adjacent support plate, the push rod also drives the connecting rod to move, and the connecting rod drives the mounting block to move toward the direction close to the adjacent support plate, so that the mounting block drives the moving rod to move toward the direction close to the adjacent support plate. When the push rod presses against the adjacent support plate, the end of the moving rod away from the mounting rod also abuts against the side of the adjacent support plate.

[0020] Preferably, the top rod and the moving rod on two adjacent supporting plates are staggered.

[0021] By adopting the above technical solution, the top rods and the moving rods on two adjacent supporting plates are staggered, so that the top rods and the moving rods can be easily abutted against the sides of the adjacent supporting plates.

[0022] In the second aspect, the present application provides a deep foundation pit support construction method, which adopts the following technical solution: A deep foundation pit support construction method comprises the following steps: S1: Move multiple support plates into the deep foundation pit respectively; S2: Fit the sides of the plurality of support plates away from the mounting rods to the four inner walls of the deep foundation pit respectively; S3: Turn the handle to drive the shaft to rotate, the shaft drives bevel gear 2 to rotate, bevel gear 2 drives bevel gear 1 to rotate, bevel gear 1 drives the drive tube to rotate, the drive tube drives the pulley to rotate, the pulley drives the transmission belt to rotate, so that the transmission belt drives the pulleys on adjacent drive tubes to rotate, so that multiple drive tubes rotate at the same time, so that the drive tube drives the two push rods to move in the direction close to the adjacent support plate, so that the end face of the push rod away from the drive tube abuts against the side of the adjacent support plate, thereby completing the support work of the deep foundation pit.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. When placing multiple support plates in a deep foundation pit, each support plate is respectively fitted with the four inner walls of the deep foundation pit, and then the handle is rotated, the handle drives the shaft to rotate, the shaft drives the second bevel gear to rotate, the second bevel gear drives the first bevel gear to rotate, the first bevel gear drives one of the driving tubes to rotate, the driving tube drives the pulley on the driving tube to rotate, the pulley drives the transmission belt to rotate, and the transmission belt drives the pulley on the adjacent driving tube to rotate, so that multiple driving tubes rotate at the same time, so that the driving tube drives the push rods at both ends of the driving tube to move in the direction away from the driving tube, so that the end face of the push rod away from the driving tube abuts against the side of the adjacent support plate, and then the support plate is pressed tightly against the inner wall of the deep foundation pit; 2. An infrared sensor is installed on the support plate to monitor the adjacent support plates in real time. When the inner wall of the deep foundation pit collapses, the collapsed soil pushes the support plate to move. When the infrared sensor detects the movement of the support plate, the signal monitored by the infrared sensor is transmitted to the controller, and the controller controls the alarm light to sound an alarm, thereby reminding the workers working in the deep foundation pit that there is a risk of collapse, facilitating timely evacuation of the workers and reducing the possibility of safety accidents. 3. When the driving tube rotates to drive the push rod to move toward the direction close to the adjacent support plate, the push rod also drives the connecting rod to move, and the connecting rod drives the mounting block to move toward the direction close to the adjacent support plate, so that the mounting block drives the moving rod to move toward the direction close to the adjacent support plate. When the push rod is pressed against the adjacent support plate, the end of the moving rod away from the mounting rod also abuts against the side of the adjacent support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the deep foundation pit support structure of the embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the structure of the support plate in the embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the structure of the driving tube in the embodiment of the present application.

[0027] Figure 4 It is a cross-sectional view of the mounting block in the embodiment of the present application.

[0028] Figure numerals: 1. Support plate; 2. Mounting rod; 21. Drive tube; 22. Push rod; 23. Limit block; 24. Limit groove; 3. Cavity; 31. Pulley; 32. Drive belt; 33. Bevel gear one; 34. Bevel gear two; 35. Rotating shaft; 36. Rotating handle; 4. Mounting plate; 41. Mounting block; 42. Through groove; 43. Moving rod; 44. Annular groove; 45. Limit plate; 46. Spring; 47. Wedge groove; 48. Wedge block; 49. Connecting rod; 5. Infrared sensor; 51. Controller; 52. Alarm light. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] The embodiment of the present application discloses a deep foundation pit support structure.

[0031] Reference Figure 1 A deep foundation pit support structure includes a plurality of support plates 1 arranged in the deep foundation pit, wherein the plurality of support plates 1 are respectively fitted with four inner walls of the deep foundation pit, and the plurality of support plates 1 are enclosed into a square frame.

[0032] Reference Figure 1 and Figure 2 A vertically arranged mounting rod 2 is fixed to the side of the support plate 1 away from the inner wall of the deep foundation pit, and a plurality of driving tubes 21 are penetrated on the side of the mounting rod 2, and the plurality of driving tubes 21 are respectively rotatably connected to the mounting rod 2, and the plurality of driving tubes 21 are arranged at equal intervals along the vertical direction. A push rod 22 is inserted at both ends of the driving tube 21, and the two push rods 22 are respectively threadedly connected to the driving tube 21, and a limiting block 23 is fixed to the outer circumference of the push rod 22, and a plurality of limiting grooves 24 are opened on both sides of the side of the support plate 1 close to the push rod 22, and the limiting block 23 is slidably arranged in the limiting groove 24, and the limiting block 23 is slidably connected to the support plate 1 along the length direction of the support plate 1 through the limiting groove 24.

[0033] Reference Figure 2 and Figure 3 The mounting rod 2 has a cavity 3 formed inside, and the outer circumferences of the plurality of driving tubes 21 are sleeved with pulleys 31, and the outer circumferences of two adjacent pulleys 31 are wound with transmission belts 32. A bevel gear 1 33 is sleeved and fixed on the outer circumference of one of the driving tubes 21, and a rotating shaft 35 is passed through the side of the mounting rod 2 away from the supporting plate 1, and a bevel gear 2 34 is sleeved and fixed on one end of the rotating shaft 35 close to the driving tube 21, and the bevel gear 2 34 meshes with the bevel gear 1 33, and a rotating handle 36 is fixed on the end of the rotating shaft 35 away from the bevel gear 2 34.

[0034] When it is necessary to support the foundation pit, multiple support plates 1 are placed in the foundation pit so that the multiple support plates 1 are respectively fitted with the four inner walls of the deep foundation pit, so that the multiple support plates 1 are enclosed in a square shape, and then the handle 36 is rotated, the handle 36 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the bevel gear 2 34 to rotate, the bevel gear 2 34 drives the bevel gear 1 33 to rotate, the bevel gear 1 33 drives one of the driving tubes 21 to rotate, the driving tube 21 drives the pulley 31 to rotate, the pulley 31 drives the transmission belt 32 to rotate, so that the transmission belt 32 drives the pulley 31 on the adjacent driving tube 21 to rotate, so that the multiple driving tubes 21 rotate at the same time, so that the driving tube 21 drives the two push rods 22 to move in the direction close to the adjacent support plates 1, and then the push rods 22 push the support plates 1 tightly against the inner wall of the deep foundation pit.

[0035] Reference Figure 1 and Figure 4 , mounting plates 4 are provided on both sides of the top of the supporting plate 1 away from the inner wall side of the deep foundation pit, and mounting blocks 41 are fixed to the side of the mounting plate 4 away from the supporting plate 1, and a through groove 42 is provided on the side of the mounting block 41, and a moving rod 43 is provided in the through groove 42, and the end face of the moving rod 43 away from the mounting rod 2 abuts against the side of the adjacent supporting plate 1. An annular groove 44 is provided on the inner circumference of the through groove 42, and a limiting plate 45 is sleeved and fixed on the outer circumference of the moving rod 43, and the limiting plate 45 is arranged in the annular groove 44, and the outer circumference of the limiting plate 45 fits the inner circumference of the annular groove 44. A spring 46 is sleeved on the moving rod 43, and one end of the spring 46 abuts against the side of the limiting plate 45 close to the mounting rod 2, and the other end of the spring 46 abuts against the inner side of the annular groove 44 close to the mounting rod 2.

[0036] Reference Figure 1 and Figure 4 A controller 51 is fixed to the top surface of the mounting block 41, and an infrared sensor 5 for detecting the moving rod 43 is fixed to the side of the mounting plate 4. The infrared sensor 5 is located on the side of the mounting block 41 close to the mounting rod 2, and the output end of the infrared sensor 5 is electrically connected to the input end of the controller 51. Alarm lights 52 are fixed to both ends of the top surface of the mounting plate 4, and the output end of the controller 51 on one side of the support plate 1 is electrically connected to the control end of the alarm light 52 located on the side of the top surface tube of the support plate 1. Wedge-shaped grooves 47 are provided on both sides of the support plate 1 away from the top of the inner wall of the deep foundation pit, and a wedge block 48 is fixed to the side of the mounting plate 4 close to the support plate 1, and the wedge block 48 is slidably installed in the wedge groove 47. A connecting rod 49 is fixed to the bottom surface of the mounting block 41, and one end of the connecting rod 49 away from the mounting block 41 is fixed to the outer peripheral surface of the top rod 22 adjacent to the mounting block 41.

[0037] When the inner wall of the deep foundation pit collapses, the collapsed soil pushes the support plate 1 to move, and the support plate 1 pushes the moving rod 43 to move. When the moving rod 43 moves close to one end of the mounting rod 2 to the monitoring range of the infrared sensor 5, the infrared sensor 5 detects the moving rod 43 and transmits the monitoring signal to the controller 51. The controller 51 controls the alarm light 52 to sound an alarm, thereby reminding the workers working in the deep foundation pit that there is a possibility of collapse of the deep foundation pit, thereby facilitating the emergency evacuation of the workers and reducing the possibility of safety accidents.

[0038] The implementation principle of a deep foundation pit support structure of the embodiment of the present application is as follows: when it is necessary to support the deep foundation pit, multiple support plates 1 are moved into the deep foundation pit, so that the multiple support plates 1 are away from the side of the mounting plate 4 and fit with the inner wall of the deep foundation pit, and then the handle 36 is rotated, the handle 36 drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the bevel gear 2 34 to rotate, the bevel gear 2 34 drives the bevel gear 1 33 to rotate, the bevel gear 1 33 drives the driving tube 21 to rotate, the driving tube 21 drives the pulley 31 to rotate, and the pulley 31 drives the transmission belt 3 2 rotates, so that the transmission belt 32 drives the pulley 31 on the adjacent driving tube 21 to rotate, so that the multiple driving tubes 21 rotate simultaneously, and the driving tube 21 drives the push rods 22 at both ends to move toward the direction close to the adjacent supporting plate 1, so that the end surface of the push rod 22 away from the driving tube 21 abuts against the side surface of the adjacent supporting plate 1, and then the supporting plate 1 is pressed tightly against the inner wall of the deep foundation pit, so that the supporting plate 1 supports the deep foundation pit, making it easier to install the supporting plate 1 to support the inner wall of the deep foundation pit, and thus facilitating the installation and removal of the supporting plate 1.

[0039] When the inner wall of the deep foundation pit collapses, the collapsed soil pushes the support plate 1 to move, causing the support plate 1 to push the moving rod 43 to move. When the moving rod 43 moves away from one end of the mutual support plate 1 to the monitoring range of the infrared sensor 5, the infrared sensor 5 transmits the monitored model to the controller 51, and the controller 51 controls the alarm light 52 to sound an alarm, thereby reminding the workers working in the deep foundation pit to evacuate in time, reducing the possibility of safety accidents when the workers are working in the deep foundation pit.

[0040] The present application also discloses a deep foundation pit support construction method, comprising the following steps: S1: moving multiple support plates 1 into the deep foundation pit respectively; S2: Fitting the sides of the plurality of support plates 1 away from the mounting rods 2 to the four inner walls of the deep foundation pit respectively; S3: Rotate the handle 36 so that the rotation drives the rotating shaft 35 to rotate, the rotating shaft 35 drives the bevel gear 2 34 to rotate, the bevel gear 2 34 drives the bevel gear 1 33 to rotate, the bevel gear 1 33 drives the driving tube 21 to rotate, the driving tube 21 drives the pulley 31 to rotate, the pulley 31 drives the transmission belt 32 to rotate, so that the transmission belt 32 drives the pulley 31 on the adjacent driving tube 21 to rotate, so that multiple driving tubes 21 rotate at the same time, so that the driving tube 21 drives the two push rods 22 to move in the direction close to the adjacent supporting plate 1, so that the end face of the push rod 22 away from the driving tube 21 abuts against the side of the adjacent supporting plate 1, thereby completing the support work of the deep foundation pit.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A deep foundation pit support structure, characterized in that: The invention comprises a plurality of support plates (1) arranged in a deep foundation pit, wherein the plurality of support plates (1) enclose a square frame, wherein the support plates (1) are fitted with the sides of the deep foundation pit that are close to each other, and a mounting rod (2) is fixed on the side of the support plate (1) away from the deep foundation pit, wherein a plurality of drive tubes (21) are passed through the side of the mounting rod (2), and both ends of the drive tube (21) are inserted with a push rod (22), and the end surface of the push rod (22) away from the drive tube (21) abuts against the side of the adjacent support plate (1), and the push rod (22) is threadedly connected to the drive tube (21), and a driving mechanism for simultaneously driving the plurality of drive tubes (21) to rotate is arranged on the mounting rod (2), and a limit assembly for limiting the push rod (22) to follow the rotation of the drive tube (21) is arranged on the support plate (1).

2. A deep foundation pit support structure according to claim 1, characterized in that: A cavity (3) is provided in the mounting rod (2); the driving mechanism comprises a pulley (31) arranged on the driving tube (21); a transmission belt (32) is wound around the outer circumference of two adjacent pulleys (31); a bevel gear 1 (33) is provided on one of the driving tubes (21); a rotating shaft (35) is passed through the side of the mounting rod (2) away from the supporting plate (1); the rotating shaft (35) is rotatably connected to the mounting rod (2); a bevel gear 2 (34) is provided at one end of the rotating shaft (35); the bevel gear 1 (33) is meshed with the bevel gear 2 (34); and a rotating handle (36) is provided at the other end of the rotating shaft (35).

3. A deep foundation pit support structure according to claim 1, characterized in that: The limiting assembly comprises a limiting block (23) fixed on the outer peripheral surface of the push rod (22); a plurality of limiting grooves (24) are provided on both sides of the side of the supporting plate (1); the plurality of limiting grooves (24) correspond to the plurality of driving tubes (21); and the limiting block (23) is slidably arranged in the limiting grooves (24).

4. A deep foundation pit support structure according to claim 3, characterized in that: Mounting plates (4) are provided on both sides of the support plate (1) away from the top of the inner wall of the deep foundation pit, and an infrared sensor (5) for detecting the movement of the support plate (1) is provided on the mounting plate (4). A controller (51) is provided on the mounting plate (4), and an alarm light (52) is provided on the top surface of the support plate (1). The output end of the infrared sensor (5) is electrically connected to the input end of the controller (51), and the output end of the controller (51) is electrically connected to the control end of the alarm light (52).

5. A deep foundation pit support structure according to claim 4, characterized in that: A mounting block (41) is arranged on the side of the mounting plate (4) away from the supporting plate (1); a through slot (42) is provided on the side of the mounting block (41); a moving rod (43) is arranged in the through slot (42); an end surface of the moving rod (43) away from the mounting rod (2) abuts against a side surface of the supporting plate (1) opposite to the moving rod (43); and the infrared sensor (5) is located on a side of the mounting block (41) close to the mounting rod (2).

6. A deep foundation pit support structure according to claim 5, characterized in that: An annular groove (44) is provided in the through groove (42); a limiting plate (45) is provided on the moving rod (43); the outer circumference of the limiting plate (45) is in contact with the inner circumference of the annular groove (44); a spring (46) is provided on the moving rod (43); one end of the spring (46) is in contact with the side surface of the limiting plate (45) close to the mounting rod (2); and the other end of the spring (46) is in contact with the inner side surface of the annular groove (44) close to the mounting rod (2).

7. A deep foundation pit support structure according to claim 6, characterized in that: The supporting plate (1) is provided with wedge-shaped grooves (47) on both sides away from the top of the inner wall side of the deep foundation pit, and the mounting plate (4) is provided with a wedge-shaped block (48) on the side away from the mounting block (41). The wedge-shaped block (48) is slidably arranged in the wedge-shaped groove (47). A connecting rod (49) is fixed to the bottom surface of the mounting block (41), and the bottom surface of the connecting rod (49) is fixed to the outer peripheral surface of the top rod (22).

8. A deep foundation pit support structure according to claim 7, characterized in that: The top rod (22) and the moving rod (43) on two adjacent supporting plates (1) are arranged in a staggered manner.

9. A deep foundation pit support construction method, according to a deep foundation pit support structure according to any one of claims 1 to 8, characterized in that: The steps include: S1: moving a plurality of support plates (1) into the deep foundation pit respectively; S2: The sides of the plurality of support plates (1) away from the mounting rod (2) are respectively fitted to the four inner walls of the deep foundation pit; S3: rotating the handle (36) so that the rotation drives the rotating shaft (35) to rotate, the rotating shaft (35) drives the bevel gear 2 (34) to rotate, the bevel gear 2 (34) drives the bevel gear 1 (33) to rotate, the bevel gear 1 (33) drives the driving tube (21) to rotate, the driving tube (21) drives the pulley (31) to rotate, the pulley (31) drives the transmission belt (32) to rotate, so that the transmission belt (32) drives the pulley (31) on the adjacent driving tube (21) to rotate, so that the multiple driving tubes (21) rotate at the same time, so that the driving tube (21) drives the two push rods (22) to move in the direction close to the adjacent supporting plate (1), so that the end face of the push rod (22) away from the driving tube (21) abuts against the side face of the adjacent supporting plate (1), thereby completing the support work of the deep foundation pit.

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