Supporting axial force self-compensation type subway station foundation pit supporting equipment and method

Abstract

The invention discloses supporting axial force self-compensation type subway station foundation pit supporting equipment and method, and belongs to the technical field of foundation pit construction. The equipment comprises a bottom plate, a supporting assembly arranged on the bottom plate, a driving assembly arranged on the bottom plate and connected with the supporting assembly and a PLC electrically connected with the driving assembly; the supporting assembly comprises a main support connected to the bottom plate in a clamped mode, a supporting plate arranged on the main support and a follow-up supporting rod arranged between the supporting plate and the main support, and a pressure sensor is arranged on the supporting plate. The driving assembly is used for driving the supporting plate to move on the bottom plate; the PLC is electrically connected with each electric device; the equipment is reasonable in structural design, the pressure sensor is arranged on the supporting plate, the driving motor is used for conducting self-adaptive compensation on supporting axial force on the supporting plate, the safety of subway station foundation pit construction can be improved, and the equipment is suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, and in particular to a support axial force self-compensating type subway station foundation pit supporting equipment and method. Background Art

[0002] Subway station foundation pit support refers to a comprehensive system of various support measures adopted during subway construction to ensure that the surrounding soil does not deform or settle during foundation pit excavation, thereby ensuring the safety of surrounding buildings and underground pipelines. The selection of foundation pit support system needs to be comprehensively considered based on geological conditions, foundation pit size, construction time and other factors.

[0003] During the foundation pit construction process, the concrete support will produce a certain deformation under the action of the external soil of the foundation pit. In order to reduce and minimize the occurrence of such deformation, prestress will be applied to the concrete support during some foundation pit construction processes. This prestress can effectively overcome the pressure of the external soil and reduce the deformation of the concrete support during the foundation pit construction process.

[0004] However, in the prior art, even if prestress is applied to the concrete support, as the construction continues, the concrete support will undergo partial plastic deformation, causing part of the prestress to disappear. The disappearance of the prestress will increase the probability of foundation pit deformation and reduce the safety factor of the foundation pit. Moreover, the existing support equipment cannot adjust the support angle according to the inclination angle of the foundation pit, and the scope of application of the support equipment is relatively limited. Summary of the invention

[0005] In view of the above-mentioned technical problems, the present invention provides a subway station foundation pit supporting equipment and method with self-compensating axial force support.

[0006] The technical solution of the present invention is: a supporting axial force self-compensation type subway station foundation pit supporting equipment, comprising a bottom plate, a supporting assembly movably arranged on the bottom plate, a driving assembly arranged on the bottom plate and connected to the supporting assembly, and a PLC controller electrically connected to the driving assembly; movable slide rails are arranged on both sides of the upper surface of the bottom plate;

[0007] The support assembly includes main supports that are slidably connected to the two movable slide rails one by one, support plates that are movably hinged to the upper end surfaces of the two main supports one by one, and follow-up support rods that are movably hinged to the two main supports one by one; a pressure plate is movably connected to one end of the two support plates that are away from each other, and a pressure sensor is provided at the connection between the pressure plate and the support plate; the other ends of the two follow-up support rods are movably hinged to the support plates at corresponding positions;

[0008] The driving assembly includes a driving motor arranged at the center of the upper end surface of the bottom plate through the chassis and two driving screws which are respectively rotated and clamped on both sides of the chassis and are respectively connected to the two output ends of the driving motor in a one-to-one correspondence; the two driving screws are respectively threadedly connected to the two main supports in a one-to-one correspondence;

[0009] The PLC controller is electrically connected to the pressure sensor and the driving motor respectively.

[0010] Furthermore, two guide slides are arranged in pairs on the sides of the two support plates close to each other; a driving shaft is slidably engaged between the two guide slides on the same support plate, and a threaded seat slidably engaged with the outer wall of the support plate is rotatably engaged on the driving shaft; the other ends of the two follower support rods are rotatably engaged with the driving shafts at corresponding positions; auxiliary motors are arranged on the sides of the two support plates close to each other, and the output ends of the two auxiliary motors are connected to auxiliary screws threadedly engaged with the threaded seats at corresponding positions;

[0011] Description: An auxiliary motor is used to drive the auxiliary screw to rotate, and the threaded seat moves up and down along the side wall of the support plate under the action of the auxiliary screw, so that the driving shaft drives the follower support rod to move up and down along the side wall of the support plate, which can realize the adjustment of the inclination angle of the support plate on the base plate, so that the equipment of the present invention can adjust the support angle of the support plate according to the construction requirements of the subway station foundation pit, reducing the use limitations of the equipment of the present invention.

[0012] Furthermore, auxiliary supports are slidably connected to the two main supports, and the support plates and follower support rods are movably hinged with the auxiliary supports at corresponding positions; a reinforcing support assembly movably connected to the two support plates is arranged on the bottom plate; the reinforcing support assembly comprises an oil cylinder arranged on the upper end surface of the chassis, an oil cylinder motor arranged on the top of the oil cylinder and a hydraulic push rod arranged on the side wall of the oil cylinder; two sealing plug plates are slidably connected to the inside of the oil cylinder; a pushing screw threadedly connected to the two sealing plug plates at the output end of the oil cylinder motor is arranged, and the internal threads on the two sealing plug plates rotate in opposite directions; four hydraulic push rods are arranged, and the four hydraulic push rods are respectively arranged on both sides of the oil cylinder and respectively located on the side of the two sealing plug plates away from each other; the four hydraulic push rods are movably abutted against the support plates at corresponding positions one by one;

[0013] Description: After the support plate is adjusted, the support plate is in a stationary state; when the pressure on the side wall of the subway station foundation pit changes; the cylinder motor is used to drive the push screw to rotate, so that the two sealing plug plates move along the inner wall of the cylinder and move away from each other under the action of the push screw, and the hydraulic oil at the upper and lower ends of the cylinder is injected into the hydraulic push rod, and the hydraulic push rod is used to push the support plate to fit closely against the side wall of the subway station foundation pit, which is beneficial to improving the reliability of the equipment of the present invention.

[0014] Furthermore, push plates connected to the hydraulic push rods at corresponding positions are provided on both sides of the oil cylinder;

[0015] Note: Using the push plate to push the support plate can make the hydraulic push rod's pushing force evenly dispersed on the support plate through the push plate, avoiding deformation and damage caused by concentrated pushing force on the support plate.

[0016] Furthermore, telescopic rods are movably hinged on the two push plates; a push frame movably hinged to the telescopic rods at corresponding positions is provided on the sides of the two support plates close to each other; and a locking member is provided on each telescopic rod;

[0017] Note: During the use of the hydraulic push rod, the telescopic rod is adaptively telescopically adjusted. When the hydraulic push rod is in a stationary state, the telescopic rod is locked and fixed by a locking component, which is beneficial to increase the telescopic stroke of the hydraulic push rod.

[0018] Furthermore, the locking member comprises an outer shell sleeved on the telescopic rod, engaging blocks movably connected to both sides of the inner part of the outer shell, and a locking screw movably connected to the outer shell and respectively threadedly connected to the two engaging blocks; a locking block capable of movably engaging with the inner core of the telescopic rod is provided on one side of the two engaging blocks close to each other;

[0019] Description: When in use, the locking screw is used to bring the two engaging blocks closer to each other, and the locking blocks on the engaging blocks are used to engage with the inner core of the telescopic rod, thereby limiting the telescopic stroke of the telescopic rod.

[0020] The present invention also provides a method for supporting a subway station foundation pit with self-compensating axial force, based on the above-mentioned supporting axial force self-compensating subway station foundation pit supporting equipment, comprising the following steps:

[0021] S1. Place the base plate at the bottom of the subway station foundation pit;

[0022] S2, control the start of the driving motor through the PLC controller, and use the driving motor to drive the driving screw to rotate, so that the two main supports drive the supporting plates connected thereto to move on the moving slide rails under the action of the driving screw, and approach the side wall of the subway station foundation pit, thereby supporting the side wall of the subway station foundation pit;

[0023] S3. The pressure plate squeezes the pressure sensor under the pressure of the soil on the side wall of the subway station foundation pit. When the load on the pressure sensor exceeds the set value, the drive motor is controlled by the PLC controller to start again, so that the support plate is further approached to the side wall of the subway station foundation pit, realizing automatic compensation of the support axial force on the support plate.

[0024] The present invention also provides a method for supporting a subway station foundation pit with self-compensating axial force, based on the above-mentioned supporting axial force self-compensating subway station foundation pit supporting equipment, comprising the following steps:

[0025] S1. Place the base plate at the bottom of the subway station foundation pit;

[0026] S2, control the start of the driving motor through the PLC controller, and use the driving motor to drive the driving screw to rotate, so that the two main supports drive the supporting plates connected thereto to move on the moving slide rails under the action of the driving screws, and approach the side walls of the subway station foundation pit, thereby supporting the side walls of the subway station foundation pit; during the movement of the supporting plates, the telescopic rods are adaptively telescopically adjusted, and when the adjustment of the supporting plates is completed, the locking screws are used to make the two engaging blocks approach each other, and the locking blocks on the engaging blocks are used to engage with the inner core of the telescopic rod to limit the telescopic travel of the telescopic rod;

[0027] S3, the pressure plate squeezes the pressure sensor under the pressure of the soil on the side wall of the subway station foundation pit; the pressure load on the pressure plate is monitored in real time by using the pressure sensor;

[0028] S4. When the load on the pressure sensor exceeds the set value, the cylinder motor is started by the PLC controller, and the cylinder motor is used to drive the push screw to rotate, so that the two sealing plug plates move along the inner wall of the cylinder and move away from each other under the action of the push screw, and the hydraulic oil at the upper and lower ends of the cylinder is injected into the hydraulic push rod. The push plate approaches the support plate under the action of the hydraulic push rod, and the support plate and the auxiliary support are pushed along the main support by the telescopic rod, so that the support plate 21 is close to the side wall of the subway station foundation pit, thereby realizing automatic compensation of the support axial force on the support plate.

[0029] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0030] First, the device structure of the present invention is reasonably designed. By arranging a pressure plate and a pressure sensor on the support plate, when the load on the pressure sensor exceeds the set value, the driving motor is used to drive the support plate closer to the side wall of the subway station foundation pit, and the support axial force on the support plate is adaptively compensated, which is conducive to improving the safety of the subway station foundation pit construction;

[0031] Second, the present invention arranges a follower support rod between the support plate and the main support, and uses an auxiliary motor to drive the follower support rod to move on the side wall of the support plate, so that the support angle of the support plate can be flexibly adjusted, so that the equipment of the present invention can meet the construction requirements of subway station foundation pits of different structures, thereby improving the applicability of the equipment of the present invention;

[0032] Third, the present invention arranges an oil cylinder on the bottom plate and uses a hydraulic push rod to support the support plate, which is beneficial to enhancing the reliability of the support plate and providing a safe and reliable construction environment for the foundation pit construction of the subway station. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a longitudinal sectional view of the apparatus of the present invention;

[0034] Figure 2 is a front view of the device of the present invention;

[0035] Figure 3 It is a schematic diagram of the connection between the main support and the movable slide rail of the present invention;

[0036] Figure 4 is a schematic diagram of the connection between the pressure plate and the support plate of the present invention;

[0037] Figure 5 is a distribution diagram of the support components of the present invention on the base plate;

[0038] Figure 6 is a top view of the apparatus of the present invention;

[0039] Figure 7 It is a schematic diagram of the connection between the push plate and the oil cylinder of the present invention;

[0040] Figure 8 It is an attempt to connect the locking member and the telescopic rod of the present invention;

[0041] Fig. 9 It is a schematic diagram of the connection between the embracing block and the outer shell of the present invention;

[0042] Among them, 1-base plate, 10-movable slide rail, 2-support assembly, 20-main support, 21-support plate, 210-guide slide plate, 211-driving shaft, 212-threaded seat, 22-follow-up support rod, 23-pressure plate, 230-pressure sensor, 231-plug-in rod, 24-auxiliary motor, 240-auxiliary screw, 25-auxiliary support, 250-sliding rod, 26-pushing frame, 3-driving assembly, 30-driving motor, 300-chassis, 31-driving screw, 4-reinforced support assembly, 40-cylinder, 41-cylinder motor, 410-driving screw, 42-hydraulic push rod, 43-sealing plug plate, 44-pushing plate, 45-telescopic rod, 46-locking member, 460-outer shell, 461-embracing block, 462-locking screw, 463-locking block. DETAILED DESCRIPTION

[0043] Example 1

[0044] like Figure 1 , 3 The illustrated embodiment is a self-compensating axial force supporting device for a subway station foundation pit, comprising a base plate 1, a supporting assembly 2 movably arranged on the base plate 1, a driving assembly 3 arranged on the base plate 1 and respectively connected to the supporting assembly 2, and a PLC controller electrically connected to the driving assembly 3; movable slide rails 10 are arranged on both sides of the upper end surface of the base plate 1;

[0045] like Figure 1 , 2 As shown in Figures 4 and 5, the support assembly 2 comprises main supports 20 which are slidably connected to two movable slide rails 10 one by one, support plates 21 which are movably hinged to the upper end surfaces of the two main supports 20 one by one, and follow-up support rods 22 which are movably hinged to the two main supports 20 one by one; a pressure plate 23 is movably connected to one end of the two support plates 21 which are away from each other, and a pressure sensor 230 is provided at the connection between the pressure plate 23 and the support plate 21; the other ends of the two follow-up support rods 23 are movably hinged to the support plates 21 at corresponding positions;

[0046] like Figure 1 , 3 As shown, the driving assembly 3 includes a driving motor 30 disposed at the center of the upper end surface of the bottom plate 1 through a chassis 300 and two driving screws 31 that are respectively rotated and clamped on both sides of the chassis 300 and are respectively connected to the two output ends of the driving motor 30 in a one-to-one correspondence; the two driving screws 31 are respectively threadedly connected to the two main supports 20 in a one-to-one correspondence;

[0047] The PLC controller is electrically connected to the pressure sensor 230 and the driving motor 30 respectively.

[0048] Example 2

[0049] This embodiment describes a method for supporting a subway station foundation pit with self-compensating axial force, and a supporting device for supporting a subway station foundation pit with self-compensating axial force according to Embodiment 1, comprising the following steps:

[0050] S1, placing the base plate 1 at the bottom of the subway station foundation pit;

[0051] S2, the driving motor 30 is started by the PLC controller, and the driving motor 30 is used to drive the driving screw 31 to rotate, so that the two main supports 20 drive the supporting plates 21 connected thereto to move on the movable slide rail 10 under the action of the driving screw 31, and approach the side wall of the subway station foundation pit, so as to support the side wall of the subway station foundation pit;

[0052] S3, the pressure plate 23 squeezes the pressure sensor 230 under the pressure of the soil on the side wall of the subway station foundation pit. When the load on the pressure sensor 230 exceeds the set value, the drive motor 30 is controlled by the PLC controller to start again, so that the support plate 21 is further approached to the side wall of the subway station foundation pit, thereby realizing automatic compensation of the support axial force on the support plate 21.

[0053] Example 3

[0054] The difference between this embodiment and embodiment 1 is that:

[0055] like Figure 2 , 5As shown in , 6, two guide slides 210 are arranged in pairs on the side where the two support plates 21 are close to each other; a driving shaft 211 is slidably engaged between the two guide slides 210 on the same support plate 21, and a threaded seat 212 that is slidably engaged with the outer wall of the support plate 21 is rotatably engaged on the driving shaft 211; the other ends of the two follower support rods 22 are rotatably engaged with the driving shaft 21 at the corresponding positions; an auxiliary motor 24 is arranged on the side where the two support plates 21 are close to each other, and the output ends of the two auxiliary motors 24 are connected to auxiliary screws 240 that are threadedly engaged with the threaded seats 212 at the corresponding positions; according to the inclination angle of the side wall of the foundation pit of the subway station, the auxiliary motor 24 is controlled to start by the PLC controller, and the auxiliary motor 24 is used to drive the auxiliary screw 240 to rotate, and the threaded seat 212 moves up and down along the side wall of the support plate 21 under the action of the auxiliary screw 240, so that the driving shaft 211 drives the follower support rod 22 to move up and down along the side wall of the support plate 21, so as to adjust the inclination angle of the support plate 22 on the bottom plate 1.

[0056] Example 4

[0057] The difference between this embodiment and embodiment 3 is that:

[0058] like Figure 1 , 7 As shown, the two main supports 20 are slidably connected with auxiliary supports 25, and the support plates 21 and the follower support rods 22 are movably hinged with the auxiliary supports 25 at the corresponding positions; the bottom plate 1 is provided with a reinforcing support assembly 4 movably connected with the two support plates 21 at the same time; the reinforcing support assembly 4 includes an oil cylinder 40 arranged on the upper end surface of the chassis 300, an oil cylinder motor 41 arranged at the top of the oil cylinder 40 and a hydraulic push rod 42 arranged on the side wall of the oil cylinder 40; two sealing plug plates 43 are slidably connected inside the oil cylinder 40 ; The output end of the cylinder motor 41 is provided with a pushing screw 410 which is threadedly connected to the two sealing plug plates 43 at the same time, and the internal threads on the two sealing plug plates 43 have opposite rotation directions; there are four hydraulic push rods 42, and the four hydraulic push rods 42 are respectively arranged on both sides of the cylinder 40 and are respectively located on the side away from each other of the two sealing plug plates 43; the four hydraulic push rods 42 are respectively and movably abutted against the support plates 21 at the corresponding positions; the auxiliary support 25 is slidably connected with the main support 20 through the sliding rod 250.

[0059] Example 5

[0060] The difference between this embodiment and embodiment 4 is that:

[0061] like Figure 5 , 8As shown in , 9, both sides of the oil cylinder 40 are provided with pushing plates 44 connected to the hydraulic push rods 42 at corresponding positions; telescopic rods 45 are movably hinged on the two pushing plates 44; the sides of the two support plates 21 close to each other are provided with pushing frames 26 movably hinged to the telescopic rods 45 at corresponding positions; each telescopic rod 45 is provided with a locking member 46; the locking member 46 includes an outer shell 460 sleeved on the telescopic rod 45, engaging blocks 461 movably engaged on both sides of the inner side of the outer shell 460 and locking screws 462 movably engaged on the outer shell 460 and respectively threadedly connected to the two engaging blocks 461; the sides of the two engaging blocks 461 close to each other are provided with locking blocks 463 that can be movably engaged with the inner core of the telescopic rod 45.

[0062] Example 6

[0063] This embodiment describes a method for supporting a subway station foundation pit with self-compensating axial force, and a supporting axial force self-compensating subway station foundation pit supporting device based on Embodiment 5, including the following steps:

[0064] S1, placing the base plate 1 at the bottom of the subway station foundation pit;

[0065] S2, the driving motor 30 is controlled to start by the PLC controller, and the driving motor 30 is used to drive the driving screw 31 to rotate, so that the two main supports 20 drive the supporting plates 21 connected thereto to move on the movable slide rail 10 under the action of the driving screw 31, and approach the side wall of the subway station foundation pit, so as to support the side wall of the subway station foundation pit; during the movement of the supporting plate 21, the telescopic rod 45 is adaptively telescopically adjusted, and when the adjustment of the supporting plate 21 is completed, the locking screw 462 is used to make the two engaging blocks 461 approach each other, and the locking block 463 on the engaging block 461 is used to engage with the inner core of the telescopic rod 45 to limit the telescopic travel of the telescopic rod 45;

[0066] S3, the pressure plate 23 squeezes the pressure sensor 230 under the pressure of the soil on the side wall of the subway station foundation pit; the pressure load on the pressure plate 23 is monitored in real time by using the pressure sensor 230;

[0067] S4. When the load on the pressure sensor 230 exceeds the set value, the cylinder motor 41 is controlled to start through the PLC controller, and the cylinder motor 41 is used to drive the push screw 410 to rotate, so that the two sealing plug plates 43 move along the inner wall of the cylinder 40 and move away from each other under the action of the push screw 410, and the hydraulic oil at the upper and lower ends of the cylinder 40 is injected into the hydraulic push rod 42. The push plate 44 approaches the support plate 21 under the action of the hydraulic push rod 42, and pushes the support plate 21 and the auxiliary support 25 along the main support 20 through the telescopic rod 45, so that the support plate 21 is close to the side wall of the subway station foundation pit, thereby realizing automatic compensation of the support axial force on the support plate 21.

[0068] Example 7

[0069] The difference between this embodiment and embodiment 5 is that:

[0070] like Figure 4 As shown, the pressure plate 23 is movably connected to the support plate 21 through the plug rod 231, and the pressure sensor 230 is arranged at the connection between the plug rod 231 and the support plate 21;

[0071] By providing the plug-in rod 231 on the pressure plate 23 , it is helpful to improve the uniformity of the pressure on the support plate 21 , so that the feedback action of the pressure sensor 230 is more accurate.

[0072] It should be noted that the pressure sensor 230, auxiliary motor 24, drive motor 30, cylinder motor 41 and PLC controller used in the present invention all adopt existing technologies; the connection relationship between the PLC and the pressure sensor 230, auxiliary motor 24, drive motor 30, cylinder motor 41 also adopts existing technologies, and no special limitations are made here. Technical personnel in this field can select corresponding products according to actual needs.

Claims

1. A self-compensating axial force type subway station foundation pit support equipment, characterized in that: It comprises a base plate (1), a support assembly (2) movably arranged on the base plate (1), a drive assembly (3) arranged on the base plate (1) and connected to the support assembly (2), and a PLC controller electrically connected to the drive assembly (3); movable slide rails (10) are arranged on both sides of the upper end surface of the base plate (1); The support assembly (2) comprises main supports (20) which are slidably connected to the two movable slide rails (10) one by one, support plates (21) which are movably hinged to the upper end surfaces of the two main supports (20) one by one, and follower support rods (22) which are movably hinged to the two main supports (20) one by one; a pressure plate (23) is movably connected to one end of the two support plates (21) which are away from each other, and a pressure sensor (230) is provided at the connection between the pressure plate (23) and the support plate (21); the other ends of the two follower support rods (23) are movably hinged to the support plates (21) at corresponding positions; The driving assembly (3) comprises a driving motor (30) arranged at the center of the upper end surface of the bottom plate (1) through a chassis (300) and two driving screw rods (31) respectively rotated and clamped on two sides of the chassis (300) and respectively connected to two output ends of the driving motor (30) in a one-to-one correspondence; the two driving screw rods (31) are respectively threadedly connected to the two main supports (20) in a one-to-one correspondence; The PLC controller is electrically connected to the pressure sensor (230) and the drive motor (30) respectively.

2. The support axial force self-compensation type subway station foundation pit support equipment according to claim 1 is characterized in that: Two guide slides (210) are arranged in pairs on the sides of the two support plates (21) close to each other; a driving shaft (211) is slidably engaged between the two guide slides (210) on the same support plate (21), and a threaded seat (212) is rotatably engaged on the driving shaft (211) and slidably engaged with the outer wall of the support plate (21); the other ends of the two follower support rods (22) are respectively rotatably engaged with the driving shaft (21) at corresponding positions; an auxiliary motor (24) is arranged on the sides of the two support plates (21) close to each other, and the output ends of the two auxiliary motors (24) are connected to auxiliary screws (240) threadedly engaged with the threaded seats (212) at corresponding positions.

3. The support axial force self-compensation type subway station foundation pit support equipment according to claim 1 is characterized in that: A secondary support (25) is slidably connected to the two main supports (20); the support plate (21) and the follower support rod (22) are movably hinged to the secondary support (25) at corresponding positions; a reinforcing support assembly (4) movably connected to the two support plates (21) is provided on the bottom plate (1); the reinforcing support assembly (4) comprises an oil cylinder (40) arranged on the upper end surface of the chassis (300), an oil cylinder motor (41) arranged on the top of the oil cylinder (40) and a hydraulic push rod (42) arranged on the side wall of the oil cylinder (40); the oil cylinder (40) is provided with a plurality of hydraulic push rods (42) arranged on the upper end surface of the chassis (300); the hydraulic push rod (41) is provided with a plurality of hydraulic push rods (42) arranged on the side wall of the hydraulic cylinder (40); the hydraulic push rod (41) is provided with a plurality of hydraulic push rods (42) arranged on the upper end surface of the chassis (30 ... upper end surface of the chassis (300); the hydraulic push rod (41) is provided with a plurality of hydraulic push rods (42) arranged on the upper end surface of the chassis (300); the hydraulic push rod (41) is provided with a plurality of hydraulic push rods (42) arranged on the upper end surface Two sealing plug plates (43) are slidably clamped inside the cylinder (40); the output end of the cylinder motor (41) is provided with a pushing screw (410) which is threadedly connected to the two sealing plug plates (43) at the same time, and the internal threads on the two sealing plug plates (43) are rotated in opposite directions; four hydraulic push rods (42) are provided, and the four hydraulic push rods (42) are respectively arranged on both sides of the cylinder (40) and are respectively located on the side away from the two sealing plug plates (43); the four hydraulic push rods (42) are respectively and movably abutted against the support plates (21) at corresponding positions.

4. The support axial force self-compensation type subway station foundation pit support equipment according to claim 3 is characterized in that: Pushing plates (44) connected to hydraulic push rods (42) at corresponding positions are provided on both sides of the oil cylinder (40).

5. The support axial force self-compensation type subway station foundation pit supporting equipment according to claim 4 is characterized in that: The two push plates (44) are both movably hinged with telescopic rods (45); a push frame (26) movably hinged to the telescopic rods (45) at corresponding positions is provided on the sides of the two support plates (21) close to each other; and a locking component (46) is provided on each of the telescopic rods (45).

6. The support axial force self-compensation type subway station foundation pit support equipment according to claim 5 is characterized in that: The locking member (46) comprises an outer shell (460) sleeved on the telescopic rod (45), engaging blocks (461) movably engaged with both sides of the inner part of the outer shell (460), and a locking screw (462) movably engaged with the outer shell (460) and respectively threadedly connected with the two engaging blocks (461); a locking block (463) capable of movably engaging with the inner core of the telescopic rod (45) is provided on one side of the two engaging blocks (461) close to each other.

7. A method for supporting a subway station foundation pit with self-compensation of supporting axial force, based on a subway station foundation pit supporting device with self-compensation of supporting axial force according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, placing the base plate (1) at the bottom of the subway station foundation pit; S2, controlling the drive motor (30) to start through the PLC controller, and using the drive motor (30) to drive the drive screw (31) to rotate, so that the two main supports (20) drive the support plates (21) connected thereto to move on the movable slide rail (10) under the action of the drive screw (31) and approach the side wall of the subway station foundation pit, thereby achieving support for the side wall of the subway station foundation pit; S3, the pressure plate (23) presses the pressure sensor (230) under the pressure of the soil on the side wall of the subway station foundation pit. When the load on the pressure sensor (230) exceeds the set value, the driving motor (30) is controlled by the PLC controller to start again, so that the support plate (21) is further approached to the side wall of the subway station foundation pit, thereby realizing automatic compensation of the support shaft force on the support plate (21).

8. A method for supporting a subway station foundation pit with self-compensation of supporting axial force, based on the equipment for supporting a subway station foundation pit with self-compensation of supporting axial force according to claim 6, characterized in that: The following steps are involved: S1, placing the base plate (1) at the bottom of the subway station foundation pit; S2, controlling the drive motor (30) to start through the PLC controller, and using the drive motor (30) to drive the drive screw (31) to rotate, so that the two main supports (20) drive the support plates (21) connected thereto to move on the movable slide rail (10) under the action of the drive screw (31), and approach the side wall of the subway station foundation pit, thereby realizing the support of the side wall of the subway station foundation pit; during the movement of the support plate (21), the telescopic rod (45) is adaptively telescopically adjusted, and when the adjustment of the support plate (21) is completed, the locking screw (462) is used to make the two engaging blocks (461) approach each other, and the locking block (463) on the engaging block (461) is engaged with the inner core of the telescopic rod (45), thereby limiting the telescopic travel of the telescopic rod (45); S3, the pressure plate (23) squeezes the pressure sensor (230) under the pressure of the soil on the side wall of the subway station foundation pit; and the pressure load on the pressure plate (23) is monitored in real time using the pressure sensor (230); S4. When the load on the pressure sensor (230) exceeds the set value, the cylinder motor (41) is controlled by the PLC controller to start, and the cylinder motor (41) is used to drive the push screw (410) to rotate, so that the two sealing plug plates (43) move along the inner wall of the cylinder (40) and move away from each other under the action of the push screw (410), and the hydraulic oil at the upper and lower ends of the cylinder (40) is injected into the hydraulic push rod (42). The push plate (44) approaches the support plate (21) under the action of the hydraulic push rod (42), and the support plate (21) and the auxiliary support (25) are pushed to move along the main support (20) through the telescopic rod (45), so that the support plate 21 is closely attached to the side wall of the subway station foundation pit, and the automatic compensation of the support axial force on the support plate (21) is realized.

9. The support axial force self-compensation type subway station foundation pit supporting equipment according to claim 1, characterized in that: Pushing plates (44) are provided on both sides of the oil cylinder (40).

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