Demounting device for inner support of deep foundation pit and using method

Abstract

The invention relates to the technical field of building construction, and discloses a deep foundation pit inner support dismantling device and a using method.The deep foundation pit inner support dismantling device comprises a bottom plate, universal wheels are rotationally installed at the bottom of the bottom plate, a cutting device and a positioning device are arranged at the top of the bottom plate, and the cutting device comprises a shell, a supporting table, a rotating motor, a rotating shaft, a first baffle and a saw blade; the positioning device comprises a rack, a gear, a driving shaft, a rotating seat and a rotating disc, and further comprises an adjusting device and a protection device. According to the device, by adjusting the cutting speed and the operation mode, the fret saw can ensure that the cutting face is smooth and the size is accurate, the positioning device can accurately adjust the position and angle of the saw blade, the cutting precision is further improved, and through positioning of the gear rack and the rotating disc, the position of the dismounting device can be adjusted in the displacement state of the bottom plate part; when the ground of a construction site is not enough to support the device to continuously move, normal cutting of the device is guaranteed, and the practicability of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, in particular to a support removal device in a deep foundation pit and a use method thereof. Background Art

[0002] Deep foundation pit support removal devices are often used in deep foundation pit projects to remove support systems after they have completed their design tasks. This type of removal device must take into account safety, efficiency, and structural stability during construction.

[0003] The existing demolition device cannot ensure that the cutting surface is flat and the size is accurate during demolition, and cannot accurately adjust the position and angle of the saw blade. Due to the relatively messy ground in the foundation pit, the obstruction of debris makes it impossible for the device to accurately locate the expected demolition position, affecting the construction progress.

[0004] When using saw blades for cutting and demolition, existing demolition devices may slip. A saw blade that is too thin may slip during cutting, affecting the cutting process, or a saw blade that is too thick may not operate normally. The compatibility and practicality are insufficient, and the saw blade replacement efficiency is low, affecting work efficiency. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a support removal device for deep foundation pits and a method for use, which solves the problems proposed in the above background technology that the existing removal device cannot ensure that the cutting surface is flat and the size is accurate during demolition, cannot accurately adjust the position and angle of the saw blade, slips, and has low efficiency in saw blade replacement.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a support and removal device in a deep foundation pit and a method of use, comprising a base plate, a universal wheel is rotatably mounted on the bottom of the base plate, and a cutting device and a positioning device are provided on the top of the base plate; the cutting device comprises an outer shell, a support platform, a rotating motor, a rotating shaft, a baffle 1 and a saw blade, the outer shell is rotatably mounted on the top of the connecting plate, the support platform is fixedly mounted on the bottom of the inner wall of the outer shell, the rotating motor is fixedly mounted on the top of the support platform, the rotating shaft rotates and passes through the side wall of the outer shell, the rotating shaft is fixedly connected to the output end of the rotating motor, the baffle 1 is fixedly mounted on the side of the rotating shaft away from the rotating motor, and the saw blade is arranged on the end face of the baffle 1.

[0007] Preferably, the positioning device includes a rack, a gear, a drive shaft, a rotating seat and a rotating disk, two of the racks are fixedly mounted on the top of the base plate, two pairs of parallel gears are meshed on the racks, the center of any pair of the gears is fixedly connected to the drive shaft, one drive shaft is fixedly connected to the first positioning motor, a connecting plate is rotatably connected between the two drive shafts through a bearing, the side of the connecting plate is fixedly connected to the motor support, the first positioning motor is fixedly connected to the upper end of the motor support, the upper end of the connecting plate is fixedly connected to the rotating seat, the rotating seat has a built-in second positioning motor, the output end of the second positioning motor is fixedly connected to the rotating disk, the lower end of the rotating disk is rotatably connected to the rotating seat and the upper end is fixedly connected to the bottom end of the outer shell.

[0008] Preferably, it also includes an adjusting device, which includes an adjusting column, a baffle 1, an adjusting box, a limit bar, an unlocking block, a bevel rod, an elastic plate, a fixed rod, a sliding rod and a plurality of limit blocks, the adjusting column is fixedly mounted on a side of the baffle 1 away from the rotating shaft, the baffle 2 is slidably mounted on the end face of the adjusting column, the adjusting box is fixedly mounted on the surface of the adjusting column, the limit bar is fixedly mounted on the surface of the baffle 2, the unlocking block slides through the side wall of the adjusting box, the bevel rod is slidably mounted on the inner wall of the adjusting box, the elastic plate is fixedly mounted on one end of the bevel rod away from the unlocking block, the fixed rod is fixedly mounted on a side of the adjusting box away from the baffle 2, the sliding rod is slidably mounted on the inner wall of the limit bar, the sliding rod is fixedly connected to the fixed rod, and a plurality of limit blocks are fixedly mounted on both ends of the sliding rod.

[0009] Preferably, a No. 1 spring is provided between the unlocking block and the adjustment box, the unlocking block contacts the inclined rod, a No. 2 spring is provided between the elastic plates, and a return spring is provided between the baffle 2 and the adjustment column.

[0010] Preferably, a protective device is also included, which includes: a hollow box, a transmission rod, a U-shaped plate, a sliding plate, a spring piece, a one-way baffle, a friction block, a pull rod and a card plate, the hollow box is fixedly installed on the surface of the outer shell, the transmission rod slides through the side wall of the hollow box, the U-shaped plate is fixedly installed on the top of the transmission rod, the sliding plate is slidably installed on the inner wall of the hollow box, the spring piece is fixedly installed on the bottom of the sliding plate, the one-way baffle is fixedly installed on the top of the sliding plate, the friction block slides through the side wall of the hollow box, the pull rod slides through the side wall of the hollow box, the pull rod is fixedly connected to the friction block, and the card plate is fixedly installed on the bottom of the friction block.

[0011] Preferably, a No. 3 spring is provided between the friction block and the hollow box, and the one-way baffle is in contact with the clamping plate.

[0012] Preferably, a mud guard is fixedly installed on the surface of the outer shell, which can effectively prevent mud in the foundation pit from entering the interior of the demolition device, thereby improving the durability and safety of the device.

[0013] A method for using a support removal device in a deep foundation pit, the specific method of use is as follows:

[0014] S1: The removal device is moved to a predetermined position by the traction device, and the first positioning motor is started. The output end of the first positioning motor drives the gear to rotate, and the cutting device is driven to move to the desired position through the engagement of the gear and the rack, and the first positioning motor is turned off;

[0015] S2: Start the second positioning motor, the output end of the second positioning motor drives the rotating disk to rotate, the rotating disk drives the cutting device to rotate to the required angle, and the second positioning motor is turned off;

[0016] S3: Start the rotating motor. The output end of the rotating motor rotates to drive the rotating shaft to rotate. The rotation of the rotating shaft drives the baffle to rotate. The rotation of the baffle drives the saw blade to rotate and cut and dismantle the building.

[0017] Preferably, the method of using the adjustment device is as follows:

[0018] S1: Pull baffle 2 outward, and the movement of baffle 2 drives the limit bar to move, so that baffle 2 moves to the desired position;

[0019] S2: Press the unlocking block, which moves and squeezes the bevel rod to move to both sides. The movement of the bevel rod drives the elastic plate to move toward the limit bar. The movement of the elastic plate contacts the limit bar and is blocked by the limit bar, causing the limit bar to deform and get stuck inside the limit bar and be limited by the slide bar, thus fixing the saw blade.

[0020] S3: Press the two elastic plates relative to each other. After the elastic plates are deformed, they no longer contact the limit bar, so that the bevel rod can move into the adjustment box. Repeat steps S1 to S2 to replace the saw blade.

[0021] Preferably, the operating process of the protective device is as follows:

[0022] S1: After the cutting is completed, the saw blade continues to move toward the bottom under the drive of the rotating motor and contacts the U-shaped plate, driving the U-shaped plate to move toward the bottom. The movement of the U-shaped plate drives the transmission rod to move toward the bottom. The movement of the transmission rod drives the one-way baffle to move toward the bottom.

[0023] S2: The one-way baffle is no longer in contact with the card plate, and the card plate limit is released. The card plate is reset by the No. 3 spring, driving the friction block to move toward baffle 1 and contact baffle 1. Baffle 1 contacts the friction block, and the speed of baffle 1 is reduced under the action of friction force, thus achieving a protective effect;

[0024] S3: Press the U-shaped plate toward the bottom, the U-shaped plate drives the transmission rod to move toward the bottom, the transmission rod drives the one-way baffle to move toward the bottom, pull the pull rod, the pull rod drives the friction block to reset and re-energy the No. 3 spring, and the sliding plate is driven to move toward the top through the reset of the spring piece, and the one-way baffle re-limits the card plate, so that the protective device returns to its initial state.

[0025] The present invention provides a support removal device in a deep foundation pit and a method for using the device, which has the following beneficial effects:

[0026] (1) The present invention drives the saw blade to rotate and dismantle the building by rotating the baffle. The device adopts the technical solution of a wire saw and can perform very precise cutting. By adjusting the cutting speed and operation mode, the wire saw can achieve a delicate and straight cutting effect, ensuring that the cutting surface is flat and the size is accurate. The positioning device 3 can accurately adjust the position and angle of the saw blade to further improve the cutting accuracy. Moreover, through the positioning of the gear rack and the rotating disk, the demolition device can adjust its position when the bottom plate is displaced. When the ground at the construction site is not sufficient to support the device to continue moving, the normal cutting of the device is guaranteed, thereby improving the practicality of the device.

[0027] (2) The present invention deforms the limit bar and is stuck inside the limit bar, and is limited by the slide bar, so that after the saw blade is replaced, different types of saw blades can be fitted to prevent the thin saw blade from slipping during cutting, which affects the cutting, or the thick saw blade from not being able to operate normally, thereby improving the adaptability and practicality of the device. After the elastic plate is deformed, it no longer contacts the limit bar, so that the bevel rod can be moved to the inside of the adjustment box and the saw blade can be quickly replaced, which reduces the replacement time and improves work efficiency.

[0028] (3) The present invention reduces the rotation speed of the baffle plate to prevent the saw blade from losing its limit and causing irregular swinging after the stress is released when the rotating motor is not turned off in time after the saw blade completes cutting, thereby improving the safety of the device during use and the protection effect on the staff. The sliding plate is driven to move to the top by the spring reset and the one-way baffle is used to re-limit the card plate, so that the device is restored to its original state and can be used again, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the cross-sectional structure of the housing of the present invention;

[0031] Figure 3 This is a schematic structural diagram of the positional relationship between the adjustment column and the baffle of the present invention;

[0032] Figure 4This is a schematic structural diagram of the cutting device of the present invention;

[0033] Figure 5 This is a schematic diagram of the cross-sectional structure of the regulating box of the present invention;

[0034] Figure 6 This is a schematic structural diagram of the protective device of the present invention;

[0035] Figure 7 It is a schematic diagram of the cross-sectional structure of the hollow box of the present invention.

[0036] In the figure: 1, bottom plate; 2, universal wheel; 3, positioning device; 4, mudguard; 5, cutting device; 6, adjustment device; 7, protective device; 31, rack; 32, gear; 33, drive shaft; 34, first positioning motor; 35, rotating seat; 36, rotating disk; 37, second positioning motor; 38, connecting plate; 51, housing; 52, support platform; 53, rotating motor; 54, rotating shaft; 55, baffle Plate 1; 56, saw blade; 61, adjustment column; 62, baffle 2; 63, adjustment box; 64, limit strip; 65, unlocking block; 66, inclined rod; 67, elastic plate; 68, fixed rod; 69, slide bar; 610, limit block; 71, hollow box; 72, transmission rod; 73, U-shaped plate; 74, sliding plate; 75, spring piece; 76, one-way baffle; 77, friction block; 78, pull rod; 79, clamping plate. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1: See Figures 1-3, a support removal device in a deep foundation pit and a method of use thereof, comprising a base plate 1, a universal wheel 2 being rotatably mounted at the bottom of the base plate 1, a cutting device 5 and a positioning device 3 being arranged on the top of the base plate 1; the cutting device 5 comprises a shell 51, a support platform 52, a rotating motor 53, a rotating shaft 54, a baffle 55 and a saw blade 56, the shell 51 being rotatably mounted on the top of the connecting plate 38, the support platform 52 being fixedly mounted on the bottom of the inner wall of the shell 51, the rotating motor 53 being fixedly mounted on the top of the supporting platform 52, the rotating shaft 54 ​​being rotatably passed through the side wall of the shell 51, the rotating shaft 54 ​​being fixedly connected to the output end of the rotating motor 53, the baffle 55 being fixedly mounted on the side of the rotating shaft 54 ​​away from the rotating motor 53, and the saw blade 56 being arranged on the end face of the baffle 55; the positioning device 3 comprises a rack 31, a gear 3 2. Drive shaft 33, rotating seat 35 and rotating disk 36, two racks 31 are fixedly installed on the top of the base plate 1, two pairs of parallel gears 32 are meshed on the racks 31, the center of any pair of gears 32 is fixedly connected to the drive shaft 33, one drive shaft 33 is fixedly connected to the first positioning motor 34, a connecting plate 38 is rotatably connected between the two drive shafts 33 through a bearing, the side of the connecting plate (38) is fixedly connected to the motor support, the first positioning motor (34) is fixedly connected to the upper end of the motor support, the upper end of the connecting plate 38 is fixedly connected to the rotating seat 35, the rotating seat 35 has a built-in second positioning motor 37, the output end of the second positioning motor 37 is fixedly connected to the rotating disk 36, the lower end of the rotating disk 36 is rotatably connected to the rotating seat 35 and the upper end is fixedly connected to the bottom end of the shell 51.

[0039] Specifically, a mud guard 4 is fixedly mounted on the surface of the outer shell 51 to prevent mud in the foundation pit from entering the device.

[0040] The specific implementation method is as follows: first, the demolition device is moved to a predetermined position by the traction device and the universal wheel 2, and the first positioning motor 34 is started. The output end of the first positioning motor 34 drives the gear 32 to rotate, and the cutting device 5 is driven to move to the desired position through the engagement of the gear 32 and the rack 31. The first positioning motor 34 is turned off, and the second positioning motor 37 is started. The output end of the second positioning motor 37 drives the rotating disk 36 to rotate, and the rotating disk 36 drives the cutting device 5 to rotate to the desired angle. The second positioning motor 37 is turned off, and the rotating motor 53 is started. The output end of the rotating motor 53 rotates to drive the rotating shaft 54 ​​to rotate. The rotation of the rotating shaft 54 ​​drives the baffle 1 55 to rotate. The rotation of the baffle 1 55 drives the saw blade 56 to rotate and cut and dismantle the building. The device adopts the technical solution of the wire saw and can accurately cut the foundation pit support. By adjusting the cutting speed and operation mode, the cutting surface can be ensured to be flat and the size is accurate. The positioning device 3 can accurately adjust the position and angle of the saw blade 56 to further improve the cutting accuracy. When the construction site is not sufficient to support the device to continue moving, the positioning device 3 can be used to ensure normal cutting, thereby improving the practicality of the device.

[0041] Example 2: See Figures 4 and 5 , also includes an adjusting device 6, the adjusting device 6 includes an adjusting column 61, a baffle 2 62, an adjusting box 63, a limiting strip 64, an unlocking block 65, a sloped rod 66, an elastic plate 67, a fixing rod 68, a sliding rod 69 and a plurality of limiting blocks 610, the adjusting column 61 is fixedly mounted on the side of the baffle 1 55 away from the rotating shaft 54, the baffle 2 62 is slidably mounted on the end face of the adjusting column 61, the adjusting box 63 is fixedly mounted on the surface of the adjusting column 61, the limiting strip 64 is fixedly mounted on the surface of the baffle 2 62, the unlocking block 65 slides through the side wall of the adjusting box 63, and the sloped rod 66 is slidably mounted On the inner wall of the adjusting box 63, the elastic plate 67 is fixedly installed on the end of the inclined rod 66 away from the unlocking block 65, the fixed rod 68 is fixedly installed on the side of the adjusting box 63 away from the baffle 2 62, the slide rod 69 is slidably installed on the inner wall of the limit bar 64, the slide rod 69 is fixedly connected to the fixed rod 68, and multiple limit blocks 610 are fixedly installed at both ends of the slide rod 69. A No. 1 spring is arranged between the unlocking block 65 and the adjusting box 63, the unlocking block 65 is in contact with the inclined rod 66, a No. 2 spring is arranged between the elastic plates 67, and a reset spring is arranged between the baffle 2 62 and the adjusting column 61.

[0042] The specific implementation is as follows: Pull the baffle plate 62 outward, the movement of the baffle plate 62 drives the limit bar 64 to move, so that the baffle plate 62 moves to the desired position, press the unlocking block 65, the unlocking block 65 moves to squeeze the inclined rod 66 to move to both sides, the inclined rod 66 moves and drives the elastic plate 67 to move in the direction of the limit bar 64, the movement of the elastic plate 67 will contact the limit bar 64 and be blocked by the limit bar 64, so that the limit bar 64 is deformed and stuck in the inside of the limit bar 64, and is limited by the slide bar 69, completing the fixation of the saw blade 56, so that after the saw blade 56 is replaced, Different types of saw blades 56 can be fitted to prevent a too thin saw blade 56 from slipping during cutting, which may affect the cutting, or a too thick saw blade 56 from being able to operate normally, thereby improving the adaptability and practicality of the device; by pressing the two elastic plates 67 relative to each other, the elastic plates 67 are deformed and no longer contact the limit strip 64, so that the bevel rod 66 can be moved to the inside of the adjustment box 63, and the above steps are repeated to replace the saw blade 56, so that the bevel rod 66 can be moved to the inside of the adjustment box 63 and the saw blade 56 can be quickly replaced, thereby reducing the replacement time and improving work efficiency.

[0043] Example 3: See Figures 6 and 7, also includes a protective device 7, which includes: a hollow box 71, a transmission rod 72, a U-shaped plate 73, a sliding plate 74, a spring piece 75, a one-way baffle 76, a friction block 77, a pull rod 78 and a card plate 79. The hollow box 71 is fixedly mounted on the surface of the shell 51, the transmission rod 72 slides through the side wall of the hollow box 71, the U-shaped plate 73 is fixedly mounted on the top of the transmission rod 72, the sliding plate 74 slides on the inner wall of the hollow box 71, the spring piece 75 is fixedly mounted on the bottom of the sliding plate 74, the one-way baffle 76 is fixedly mounted on the top of the sliding plate 74, the friction block 77 slides through the side wall of the hollow box 71, the pull rod 78 slides through the side wall of the hollow box 71, the pull rod 78 is fixedly connected to the friction block 77, the card plate 79 is fixedly mounted on the bottom of the friction block 77, a No. 3 spring is provided between the friction block 77 and the hollow box 71, and the one-way baffle 76 contacts the card plate 79.

[0044] The specific implementation is as follows: after the cutting is completed, the saw blade 56 continues to move toward the bottom under the drive of the rotating motor 53 and contacts the U-shaped plate 73, driving the U-shaped plate 73 to move toward the bottom. The movement of the U-shaped plate 73 drives the transmission rod 72 to move toward the bottom. The movement of the transmission rod 72 drives the one-way baffle 76 to move toward the bottom. The one-way baffle 76 no longer contacts the card plate 79. The limit of the card plate 79 is released. The card plate 79 is reset by the No. 3 spring and drives the friction block 77 to move in the direction of the baffle 1 55 and contact the baffle 1 55. The baffle 1 55 contacts the friction block 77. The speed of the baffle 1 55 is reduced under the action of friction to prevent the saw blade 56 from not rotating the rotating motor in time after the cutting is completed. When 53 is closed, the saw blade 56 loses its limit and the stress is released, resulting in irregular swinging, which may cause personal injury. This improves the safety of the device during use and the protection effect on the staff. The U-shaped plate 73 is pressed toward the bottom, and the U-shaped plate 73 drives the transmission rod 72 to move toward the bottom. The transmission rod 72 drives the one-way baffle 76 to move toward the bottom, pulling the pull rod 78. The pull rod 78 drives the friction block 77 to reset and re-store energy in the No. 3 spring. The spring piece 75 is reset to drive the sliding plate 74 to move to the top and the one-way baffle 76 to re-limit the card plate 79, so that the protective device 7 is restored to its original state and can be used again, thereby improving the practicality of the device.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A support removal device in a deep foundation pit, comprising a bottom plate (1), characterized in that: A universal wheel (2) is rotatably mounted on the bottom of the base plate (1), and a cutting device (5) and a positioning device (3) are provided on the top of the base plate (1); The cutting device (5) includes a housing (51), a support platform (52), a rotary motor (53), a rotating shaft (54), a baffle (55) and a saw blade (56), wherein the housing (51) is rotatably mounted on the top of the connecting plate (38), the support platform (52) is fixedly mounted on the bottom of the inner wall of the housing (51), the rotary motor (53) is fixedly mounted on the top of the support platform (52), the rotating shaft (54) rotatably passes through the side wall of the housing (51), the rotating shaft (54) is fixedly connected to the output end of the rotary motor (53), the baffle (55) is fixedly mounted on a side of the rotating shaft (54) away from the rotary motor (53), and the saw blade (56) is arranged on the end face of the baffle (55).

2. The support removal device in a deep foundation pit according to claim 1, characterized in that: The positioning device (3) comprises a rack (31), a gear (32), a drive shaft (33), a rotating seat (35) and a rotating disk (36), wherein the two racks (31) are fixedly mounted on the top of the base plate (1), two pairs of parallel gears (32) are meshed on the racks (31), the center of any pair of the gears (32) is fixedly connected to a drive shaft (33), one drive shaft (33) is fixedly connected to a first positioning motor (34), a connecting plate (38) is rotatably connected between the two drive shafts (33) via a bearing, a side of the connecting plate (38) is fixedly connected to a motor support, the first positioning motor (34) is fixedly connected to the upper end of the motor support, the upper end of the connecting plate (38) is fixedly connected to the rotating seat (35), the rotating seat (35) has a built-in second positioning motor (37), the output end of the second positioning motor (37) is fixedly connected to the rotating disk (36), the lower end of the rotating disk (36) is rotatably connected to the rotating seat (35) and the upper end is fixedly connected to the bottom end of the housing (51).

3. The support removal device in a deep foundation pit according to claim 1, characterized in that: The adjusting device (6) further comprises an adjusting column (61), a second baffle (62), an adjusting box (63), a limiting strip (64), an unlocking block (65), an inclined rod (66), an elastic plate (67), a fixing rod (68), a sliding rod (69) and a plurality of limiting blocks (610), wherein the adjusting column (61) is fixedly mounted on a side of the first baffle (55) away from the rotating shaft (54), the second baffle (62) is slidably mounted on the end face of the adjusting column (61), the adjusting box (63) is fixedly mounted on the surface of the adjusting column (61), and the limiting strip (64) is fixedly mounted on the surface of the adjusting column (61). On the surface of baffle plate 2 (62), the unlocking block (65) slides through the side wall of the regulating box (63), the inclined rod (66) is slidably mounted on the inner wall of the regulating box (63), the elastic plate (67) is fixedly mounted on one end of the inclined rod (66) away from the unlocking block (65), the fixed rod (68) is fixedly mounted on a side of the regulating box (63) away from baffle plate 2 (62), the sliding rod (69) is slidably mounted on the inner wall of the limiting strip (64), the sliding rod (69) is fixedly connected to the fixed rod (68), and a plurality of limiting blocks (610) are fixedly mounted on both ends of the sliding rod (69).

4. The deep foundation pit support removal device according to claim 3, characterized in that: A No. 1 spring is provided between the unlocking block (65) and the regulating box (63), the unlocking block (65) contacts the inclined rod (66), a No. 2 spring is provided between the elastic plates (67), and a return spring is provided between the baffle plate 2 (62) and the regulating column (61).

5. The support removal device in a deep foundation pit according to claim 1, characterized in that: The protective device (7) further comprises: a hollow box (71), a transmission rod (72), a U-shaped plate (73), a sliding plate (74), a spring (75), a one-way baffle (76), a friction block (77), a pull rod (78) and a clamping plate (79), wherein the hollow box (71) is fixedly mounted on the surface of the housing (51), the transmission rod (72) slides through the side wall of the hollow box (71), the U-shaped plate (73) is fixedly mounted on the top of the transmission rod (72), and the The sliding plate (74) is slidably mounted on the inner wall of the hollow box (71), the spring piece (75) is fixedly mounted on the bottom of the sliding plate (74), the one-way baffle (76) is fixedly mounted on the top of the sliding plate (74), the friction block (77) slides through the side wall of the hollow box (71), the pull rod (78) slides through the side wall of the hollow box (71), the pull rod (78) is fixedly connected to the friction block (77), and the clamping plate (79) is fixedly mounted on the bottom of the friction block (77).

6. The support removal device in a deep foundation pit according to claim 5, characterized in that: A No. 3 spring is provided between the friction block (77) and the hollow box (71), and the one-way baffle (76) is in contact with the clamping plate (79).

7. The deep foundation pit support removal device according to claim 1, characterized in that: A fender (4) is fixedly mounted on the surface of the housing (51).

8. A method for using a support removal device in a deep foundation pit, characterized by: The device for removing support in a deep foundation pit according to any one of claims 1 to 7 is used as follows: S1: The removal device is moved to a predetermined position by a traction device, and the first positioning motor (34) is started. The output end of the first positioning motor (34) drives the gear (32) to rotate, and the cutting device (5) is driven to move to a desired position through the engagement of the gear (32) and the rack (31), and the first positioning motor (34) is turned off. S2: Start the second positioning motor (37), the output end of the second positioning motor (37) drives the rotating disk (36) to rotate, the rotating disk (36) drives the cutting device (5) to rotate to the required angle, and the second positioning motor (37) is turned off; S3: Start the rotating motor (53), the output end of the rotating motor (53) rotates to drive the rotating shaft (54), the rotating shaft (54) rotates to drive the baffle plate (55), and the baffle plate (55) rotates to drive the saw blade 56 to cut and dismantle the foundation pit support.

9. The method for using the support removal device in a deep foundation pit according to claim 8, characterized in that: The method of using the regulating device (6) is as follows: S1: Pull the baffle plate 2 (62) outward, and the movement of the baffle plate 2 (62) drives the limit bar (64) to move, so that the baffle plate 2 (62) moves to the desired position; S2: Press the unlocking block (65), the unlocking block (65) moves to squeeze the inclined rod (66) to move to both sides, the inclined rod (66) moves to drive the elastic plate (67) to move in the direction of the limit bar (64), the elastic plate (67) moves to contact the limit bar (64) and is blocked by the limit bar (64), so that the limit bar (64) is deformed and stuck in the inside of the limit bar (64), and is limited by the slide bar (69), thereby completing the fixation of the saw blade (56); S3: Press the two elastic plates (67) relative to each other. After the elastic plates (67) are deformed, they no longer contact the limit bar (64), so that the bevel rod (66) can be moved into the adjustment box (63). Repeat steps S1 to S2 to replace the saw blade (56).

10. The method for using the support removal device in a deep foundation pit according to claim 8, characterized in that: The operating process of the protective device (7) is as follows: S1: After the cutting is completed, the saw blade (56) continues to move toward the bottom under the drive of the rotating motor (53) and contacts the U-shaped plate (73), driving the U-shaped plate (73) to move toward the bottom, the movement of the U-shaped plate (73) drives the transmission rod (72) to move toward the bottom, and the movement of the transmission rod (72) drives the one-way baffle (76) to move toward the bottom; S2: The one-way baffle (76) is no longer in contact with the card plate (79), the limit of the card plate (79) is released, the card plate (79) is reset by the third spring and drives the friction block (77) to move in the direction of the baffle plate (55) and contact the baffle plate (55), the baffle plate (55) contacts the friction block (77), and the speed of the baffle plate (55) is reduced under the action of friction force, thereby achieving a protective effect; S3: Press the U-shaped plate (73) toward the bottom, the U-shaped plate (73) drives the transmission rod (72) to move toward the bottom, the transmission rod (72) drives the one-way baffle (76) to move toward the bottom, pull the pull rod (78), the pull rod (78) drives the friction block (77) to reset and re-store energy in the No. 3 spring, resets the spring (75) and drives the sliding plate (74) to move toward the top and causes the one-way baffle (76) to limit the card plate (79) again, so that the protective device (7) returns to its initial state.

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