A foundation pit safety protection device

Abstract

The present invention relates to the technical field of building auxiliary equipment, and in particular to a foundation pit safety protection device, including a membrane top, which is an arc-shaped double-layer air membrane, and the membrane top covers the foundation pit, and also includes a membrane wall, a winch, and a supporting mechanism. The membrane wall is a long strip of double-layer plastic film, and the membrane top and the membrane wall are both provided with an inflation port, the top of the membrane wall is connected to the bottom frame of the membrane top, and the bottom of the membrane wall is wound in the winch, and the winch is fixed on the ground outside the edge of the foundation pit, and the adjacent membrane walls are connected as a whole to wrap the foundation pit or the ground building; the inner bottom of the membrane top is evenly provided with a plurality of support pads, and the support mechanism is arranged at the bottom of the foundation pit or the top surface of the ground building, and the support pads correspond to the support mechanism one by one. The foundation pit safety protection device can play a protective, soundproof, and dustproof role in the entire underground and ground construction process of the building, is easy to disassemble and assemble, and can be reused, thereby improving construction efficiency and reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of building auxiliary equipment, and in particular to a foundation pit safety protection device. Background Art

[0002] The foundation pit is the space below the ground for construction. The excavation of the foundation pit and the construction will have adverse effects on the surrounding environment and people, usually manifested as noise, dust pollution and falling risks. Usually, a circle of guardrails is set up around the foundation pit, and a circle of walls is set up around the construction site. However, fences and walls can only prevent the risk of falling, and have limited effect on isolating noise and dust.

[0003] To this end, in the prior art, the invention patent with application publication number CN118704480A provides a double-layer air film foundation pit support structure, including a ground beam, a double-layer air film, a fan and a fixing mechanism. The double-layer air film is laid on the ground beam, and its edge is fixedly connected to the ground beam. The air outlet of the fan is connected to the double-layer air film through an air duct; the fixing mechanism is installed on the double-layer air film to fix the double-layer air film. The air film can not only isolate the inside and outside of the foundation pit and play a role in preventing falling, but also reduce noise and dust pollution, and at the same time can keep warm and insulate, improve the working environment, and can also work normally on rainy days.

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the air film in the prior art needs to be installed on a bracket or a support beam, and the bracket and the support beam are usually fixed disposable structures, with high construction costs, and the height of the air film cannot be conveniently adjusted. After the underground part is built, the air film needs to be dismantled before the above-ground part can be built, which has a low utilization rate of the air film shield and causes a great waste of resources. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention develops a foundation pit safety protection device, which can play a protective, soundproof and dustproof role in the entire underground and above-ground construction process of the building, is easy to disassemble and assemble, and can be reused, thereby improving construction efficiency and reducing costs.

[0006] The technical solution to the technical problem solved by the present invention is as follows: an embodiment of the present invention provides a foundation pit safety protection device, which is used for safety protection of construction in the foundation pit below the ground and construction of ground buildings, including a membrane top, which is an arc-shaped double-layer air membrane, and the membrane top covers the foundation pit, and also includes a membrane wall, a winch, and a supporting mechanism. The membrane wall is a long strip of double-layer plastic film, and both the membrane top and the membrane wall are provided with inflation ports. The top of the membrane wall is connected to the bottom frame of the membrane top, and the bottom of the membrane wall is wound in the winch. The winch is fixed on the ground outside the edge of the foundation pit, and adjacent membrane walls are connected as a whole to wrap the foundation pit or the ground building; a plurality of support pads are evenly arranged on the inner bottom of the membrane top, and the supporting mechanism is arranged at the bottom of the foundation pit or the top surface of the ground building, and the support pads are connected to the support The supporting mechanism corresponds to each other; the supporting mechanism includes a supporting column, a third arm, and a supporting plate. The supporting column includes two groups, and the supporting column includes a column, an upper arm, a forearm, a base, a turntable 1, and a turntable 2. The column is arranged vertically, and a flange plate is arranged at the bottom of the column. The column is fixed to the bottom of the foundation pit or the top surface of the ground building through the flange plate at the bottom. The base is fixed to the top of the column. The turntable 1 is installed in the base. The lower end of the upper arm is connected to the turntable 1 through a rotating shaft, and the upper end of the upper arm is connected to the lower end of the forearm through a rotating shaft. The turntable 2 is installed at the upper end of the forearm. The turntable 2 in the two groups of supporting columns is respectively connected to the lower end of the third arm through a rotating shaft. The support plate is arranged at the upper end of the third arm. The rotating shaft in the supporting column and the rotating shaft between the turntable 2 and the third arm are all provided with a fastening mechanism. The membrane wall and the membrane top, and the adjacent membrane walls are connected by any one of nylon Velcro, zipper, button, and buckle. The inflation port of the membrane top and the membrane wall is connected to a high-pressure air source or a blower. The support mechanism can lift up the support pad, thereby supporting the membrane wall and the membrane top; a magnet or electromagnet is arranged on the support plate, a spiral coil is arranged in the support pad, the spiral coil is connected to the power supply through a switch, and the magnetic poles on the opposite sides of the support plate and the support pad have the same polarity.

[0007] As an optimization, the support column also includes a tightening nut, a fastening screw, and a gasket. A screw is arranged at the bottom of the turntable, which passes through the base and is connected to the tightening nut. The edge of the turntable is evenly provided with a plurality of penetrating threaded holes, and the fastening screw is installed in the threaded hole on the edge of the turntable. The gasket is arranged below the fastening screw, and the gasket is arranged between the turntable and the base.

[0008] As an optimization, the support column also includes a fastening nut and a rotating shaft. One end of the rotating shaft is provided with an external thread. The end of the rotating shaft without a thread is fixed on a turntable. The end of the rotating shaft with an external thread passes through the lower end of the upper arm and is connected to the fastening nut.

[0009] As an optimization, the support column also includes a friction pad, which is arranged on a rotating shaft between a fastening nut and an upper arm, and the friction pad is made of rubber.

[0010] As an optimization, the support column also includes a second rotating shaft and a second fastening nut. One end of the second rotating shaft is provided with an external thread. The non-threaded end of the second rotating shaft is fixed to the upper end of the upper arm, and the end of the second rotating shaft with an external thread passes through the lower end of the forearm and is connected to the second fastening nut.

[0011] As an optimization, the support column also includes a tightening nut 2, a fastening screw 2, a rotating shaft 3, and a fastening nut 3. A screw is arranged at the bottom of the turntable 2, and the screw passes through the top surface of the forearm and is connected to the tightening nut 2. A plurality of through threaded holes are evenly arranged on the edge of the turntable 2, and the fastening screw 2 is installed in the threaded hole on the edge of the turntable 2; two parallel mounting plates are arranged at the lower end of the third arm, one end of the rotating shaft 3 is fixed on the turntable 2, and the other end passes through a mounting plate and is connected to the fastening nut 3.

[0012] As an optimization, handles are provided on the sides of the fastening nut one, the fastening nut two, and the fastening nut three.

[0013] As an optimization, the winch includes a motor, a drum, an upper roller, a lower roller, and a frame. The motor is installed on the frame, and the drum, the upper roller, and the lower roller are installed on the frame through a bearing seat. The upper roller, the lower roller, and the drum are arranged in parallel, the drum is connected to the output shaft of the motor, and the upper roller is arranged directly above the lower roller.

[0014] The effects provided in the content of the invention are only the effects of the embodiments, rather than all the effects of the invention. The above technical solution has the following advantages or beneficial effects:

[0015] 1. By setting up the membrane wall, the membrane wall is composed of multiple units and can be detached. The membrane wall and the membrane top can also be easily combined and disassembled, which is convenient for disassembly and reuse. The foundation pit safety protection device can play a protective, soundproof and dustproof role in the construction process of underground foundation pits and ground buildings. It is easy to disassemble and re-use, which improves construction efficiency and reduces costs.

[0016] 2. By setting up two groups of support columns, when one support column is moved, the other group of support columns is fixed, and the position of the support plate can still be fixed, which will not affect the support of the membrane top and ensure the stability of the membrane top.

[0017] 3. By setting a magnetic repulsion between the support plate and the support pad, the support mechanism can support the support pad not only by direct contact but also by non-contact; the magnetic strength of the electromagnet and the spiral coil can be controlled by controlling the voltage, so that the support strength of the support mechanism on the support pad can be conveniently controlled. The support mechanism can support the support pad in a larger range, reducing the installation requirements for the support mechanism and improving the installation efficiency.

[0018] 4. The tightening nut 1 can limit the axial freedom of the turntable 1, so that the turntable 1 can only rotate in the base. The fastening screw 1 can lock the rotation of the turntable 1: by tightening the fastening screw 1, the turntable 1 cannot rotate; by loosening the fastening screw 1, the turntable 1 can rotate. By setting a gasket, the gasket is made of rubber material, and when tightening the fastening screw 1, the firmness of the lock of the turntable 1 can be improved. By tightening and loosening the fastening nut 1, the upper arm can be locked and released, thereby controlling whether the upper arm can rotate around the turntable 1. By setting a friction pad between the fastening nut 1 and the upper arm, the friction force can be increased, and the firmness of the upper arm can be improved when the fastening nut 1 is tightened to fix the turntable 1 and the upper arm. By tightening and loosening the fastening nut 2, the forearm can be locked and released, thereby controlling whether the forearm can rotate around the upper arm. The rotational freedom of the turntable 2 can be controlled by controlling the tightening and loosening of the fastening screw 2, and the rotational freedom of the third arm can be controlled by controlling the tightening and loosening of the fastening nut 3.

[0019] 5. By providing handles on the sides of the fastening nut 1, the fastening nut 2 and the fastening nut 3, the dependence on tools can be eliminated, and the fastening nut 1, the fastening nut 2 and the fastening nut 3 can be tightened and loosened manually to improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the foundation pit construction status of an embodiment of the present invention.

[0021] Figure 2 This is a three-dimensional diagram of the foundation pit construction status after the membrane top and membrane wall are hidden in one embodiment of the present invention.

[0022] Figure 3 It is a stereoscopic view from the bottom perspective of the front end on the left side of the membrane top in an embodiment of the present invention.

[0023] Figure 4 The present invention is a three-dimensional diagram of the construction status of a ground building according to an embodiment of the present invention.

[0024] Figure 5 This is a three-dimensional diagram of the construction status of an above-ground building with the membrane top and membrane wall hidden in accordance with an embodiment of the present invention.

[0025] Figure 6 The figure is a three-dimensional diagram of a support mechanism according to an embodiment of the present invention.

[0026] Figure 7 This is a front view of a support mechanism according to an embodiment of the present invention.

[0027] Figure 8 This is an internal schematic diagram of a support plate in one embodiment of the present invention.

[0028] Fig. 9 for Figure 6 A partial enlarged view of area A.

[0029] Fig.10 for Figure 7 Cross-sectional view along CC direction.

[0030] Fig.11 for Figure 6 A partial enlarged view of the D area in the middle.

[0031] Fig.12 for Figure 6 A partial enlarged view of area B.

[0032] Fig.13 for Figure 7 Cross-sectional view along EE direction.

[0033] Fig.14 It is a front view of a winch in one embodiment of the present invention.

[0034] Fig.15 The figure is a three-dimensional diagram of a winch in one embodiment of the present invention.

[0035] Among them: membrane top 1, membrane wall 2, winch 3, supporting mechanism 4, ground 5, foundation pit 6, ground building 7, supporting pad 11, motor 31, reel 32, upper drum 33, lower drum 34, frame 35, column 41, upper arm 42, forearm 43, third arm 44, support plate 45, base 46, gasket 47, turntable one 48, fastening nut one 49, friction pad 410, turntable two 411, rotating shaft one 412, tightening nut one 413, rotating shaft two 414, tightening nut two 415, rotating shaft three 416, tightening nut three 417, tightening nut two 418, fastening screw one 419, fastening screw two 420, mounting plate 441. DETAILED DESCRIPTION

[0036] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0037] Figures 1 to 15 As an embodiment of the present invention, Figures 1 to 4As shown, a foundation pit safety protection device is used for safety protection of construction in a foundation pit 6 below the ground 5 and construction of an above-ground building 7, including a membrane top 1, a membrane wall 2, a hoist 3, and a support mechanism 4. The membrane top 1 is an arc-shaped double-layer air membrane, and the membrane top 1 covers the foundation pit 6. The membrane wall 2 is a long strip of double-layer plastic film. The membrane top 1 and the membrane wall 2 are both provided with an inflation port. The top of the membrane wall 2 is connected to the bottom frame of the membrane top 1, and the bottom of the membrane wall 2 is wound in the hoist 3. The hoist 3 is fixed on the ground 5 outside the edge of the foundation pit 6. The adjacent membrane walls 2 are connected as a whole and then wrap the foundation pit 6 or the above-ground building 7; a plurality of support pads 11 are evenly arranged on the inner bottom of the membrane top 1, and the support mechanism 4 is arranged at the bottom of the foundation pit 6 or the top surface of the above-ground building 7, and the support pads 11 correspond to the support mechanism 4 one by one. The membrane wall 2 and the membrane top 1, and the adjacent membrane walls 2 are connected by any one of nylon Velcro, zipper, button, and buckle. The inflation ports of the membrane top 1 and the membrane wall 2 are connected to a high pressure gas source or a blower. The support mechanism 4 can support the support pad 11, thereby supporting the membrane wall 2 and the membrane top 1.

[0038] like Figure 6 , Figure 7 As shown, the supporting mechanism 4 includes a supporting column, a third arm 44, and a supporting plate 45. The supporting column includes two groups, and the supporting column includes a column 41, an upper arm 42, a forearm 43, a base 46, a turntable 1 48, and a turntable 2 411. The column 41 is vertically arranged, and a flange plate is arranged at the bottom of the column 41. The column 41 is fixed to the bottom of the foundation pit 6 or the top surface of the ground building 7 through the flange plate at the bottom, and the base 46 is fixed to the top of the column 41. The turntable 1 48 is installed in the base 46, the lower end of the upper arm 42 is connected to the turntable 1 48 through a rotating shaft, the upper end of the upper arm 42 is connected to the lower end of the forearm 43 through a rotating shaft, and the turntable 2 411 is installed on the upper end of the forearm 43. The turntable 2 411 in the two groups of supporting columns are respectively connected to the lower end of the third arm 44 through the rotating shaft, and the support plate 45 is arranged at the upper end of the third arm 44. The rotating shaft in the supporting column and the rotating shaft between the turntable 2 411 and the third arm 44 are all provided with a fastening mechanism.

[0039] like Figure 8 As shown, a magnet or an electromagnet is provided on the support plate 45, and a spiral coil is provided in the support pad 11. The spiral coil is connected to a power source through a switch, and the magnetic poles of the opposite surfaces of the support plate 45 and the support pad 11 are the same. By setting a magnetic repulsion between the support plate 45 and the support pad 11, the support mechanism 4 can support the support pad 11 not only by direct contact, but also by non-contact; the magnetic strength of the electromagnet and the spiral coil can be controlled by controlling the magnitude of the voltage, so that the support strength of the support mechanism 4 on the support pad 11 can be conveniently controlled, and the support mechanism 4 can support the support pad 11 in a larger range, which reduces the installation requirements for the support mechanism 4 and improves the installation efficiency.

[0040] like Fig. 9 , Fig.10 As shown, the support column also includes a tightening nut 413, a fastening screw 419, and a gasket 47. A screw is arranged at the bottom of the turntable 48, and the screw passes through the base 46 and is connected to the tightening nut 413. The edge of the turntable 48 is evenly provided with a plurality of threaded holes, and the fastening screw 419 is installed in the threaded holes on the edge of the turntable 48. The gasket 47 is arranged below the fastening screw 419, and the gasket 47 is arranged between the turntable 48 and the base 46. The tightening nut 413 can limit the axial freedom of the turntable 48, so that the turntable 48 can only rotate in the base 46. The fastening screw 419 can lock the rotation of the turntable 48: when the fastening screw 419 is tightened, the turntable 48 cannot rotate; when the fastening screw 419 is loosened, the turntable 48 can rotate. By setting a gasket 47, which is made of rubber, tightening the fastening screw 419 can improve the firmness of the locking of the turntable 48. The support column also includes a fastening nut 49 and a rotating shaft 412. One end of the rotating shaft 412 is provided with an external thread. The end of the rotating shaft 412 without a thread is fixed on the turntable 48. The end of the rotating shaft 412 with an external thread passes through the lower end of the upper arm 42 and is connected to the fastening nut 49. The upper arm 42 can be locked and released by tightening and loosening the fastening nut 49, thereby controlling whether the upper arm 42 can rotate around the turntable 48. The support column also includes a friction pad 410, which is arranged on the rotating shaft 412 between the fastening nut 49 and the upper arm 42, and the friction pad 410 is made of rubber. By providing a friction pad 410 between the fastening nut 49 and the upper arm 42, the friction force can be increased, and the firmness of the upper arm 42 can be improved when the fastening nut 49 is tightened to fix the turntable 48 and the upper arm 42.

[0041] like Fig.11 As shown, the support column further includes a second rotating shaft 414 and a second fastening nut 415. One end of the second rotating shaft 414 is provided with an external thread, and the non-threaded end of the second rotating shaft 414 is fixed to the upper end of the upper arm 42. The end of the second rotating shaft 414 with an external thread passes through the lower end of the forearm 43 and is connected to the second fastening nut 415. By tightening and loosening the second fastening nut 415, the forearm 43 can be locked and released, thereby controlling whether the forearm 43 can rotate around the upper arm 42.

[0042] like Fig.12 , Fig.13As shown, the support column also includes a tightening nut 2 418, a fastening screw 2 420, a rotating shaft 3 416, and a fastening nut 3 417. A screw is arranged at the bottom of the second turntable 411, and the screw passes through the top surface of the forearm 43 and is connected to the tightening nut 2 418. The edge of the second turntable 411 is evenly provided with a plurality of threaded holes, and the fastening screw 2 420 is installed in the threaded holes on the edge of the second turntable 411. Two parallel mounting plates 441 are arranged at the lower end of the third arm 44, and one end of the rotating shaft 3 416 is fixed on the second turntable 411, and the other end passes through a mounting plate 441 and is connected to the fastening nut 3 417. The rotational freedom of the second turntable 411 can be controlled by controlling the tightening and loosening of the fastening screw 2 420, and the rotational freedom of the third arm 44 can be controlled by controlling the tightening and loosening of the fastening nut 3 417.

[0043] The sides of the fastening nut 1 49, the fastening nut 2 415, and the fastening nut 3 417 are all provided with handles. By providing handles on the sides of the fastening nut 1 49, the fastening nut 2 415, and the fastening nut 3 417, the dependence on tools can be eliminated, and the fastening nut 1 49, the fastening nut 2 415, and the fastening nut 3 417 can be tightened and loosened manually, thereby improving work efficiency.

[0044] like Fig.14 , Fig.15 As shown, the winch 3 includes a motor 31, a drum 32, an upper roller 33, a lower roller 34, and a frame 35. The motor 31 is installed on the frame 35. The drum 32, the upper roller 33, and the lower roller 34 are installed on the frame 35 through a bearing seat. The upper roller 33, the lower roller 34, and the drum 32 are arranged in parallel. The drum 32 is connected to the output shaft of the motor 31, and the upper drum 33 is arranged directly above the lower drum 34.

[0045] like Figure 2 As shown, when construction is carried out in the foundation pit 6, the support mechanism 4 is arranged at the bottom of the foundation pit 6; Figure 5 As shown, after the construction of the above-ground building 7 begins, the support mechanism 4 moves one by one and is installed on the top surface of the above-ground building 7, and rises with the rise of the above-ground building 7, while releasing the membrane wall 2 in the winch 3, and connecting the released membrane wall 2 as a whole until the construction of the above-ground building 7 is completed. When it is necessary to dismantle the device, first release the connection between the membrane wall 2 and the membrane top 1, then deflate the membrane top 1, and then fold and collect the membrane top 1; finally, release the connection between adjacent membrane walls 2, deflate the membrane wall 2, and collect the membrane wall 2 by the winch 3. The membrane wall 2 is composed of multiple units and can be detached, and the membrane wall 2 and the membrane top 1 can also be conveniently combined and disassembled, which is convenient for disassembly and reuse. The foundation pit safety protection device can play a protective, soundproof and dustproof role during the construction of the underground foundation pit 6 and the above-ground building 7, is easy to disassemble and assemble, can be reused, improves construction efficiency, and reduces costs.

[0046] During the construction process, the position of the column 41 needs to be adjusted. Construction process: First, build the ground building 7 in the area where the column 41 is not installed, then move the column 41 to the top of the ground building 7, and then construct the area where the column 41 was originally installed, and repeat this process to complete the construction of a certain height of the ground building 7. Then uniformly adjust the height of all the supporting mechanisms 4 to raise the membrane top 1 and release more membrane walls 2. Repeat the above steps until all the construction is completed. The rotating shaft in the support column and the rotating shaft between the turntable 2 411 and the third arm 44 are provided with fastening mechanisms. When the column 41 needs to be moved, the fastening mechanism of the rotating shaft in the support column where the column 41 is located, and the fastening mechanism between the turntable 2 411 and the third arm 44 corresponding to the support column are loosened, and the column 41 is moved to a new fixed position, and then the fastening mechanisms related to the column 41 are tightened to complete the movement of the column 41. By setting two groups of support columns, when one support column is moved, the other group of support columns is fixed, and the position of the support plate 45 can still be fixed, which will not affect the support of the membrane top 1 and ensure the stability of the membrane top 1.

[0047] Although the above describes the specific implementation mode of the invention in conjunction with the drawings, it is not intended to limit the scope of protection of the invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A foundation pit safety protection device, used for providing safety protection for construction in a foundation pit (6) below the ground (5) and construction of an above-ground building (7), comprising a membrane top (1), the membrane top (1) being an arc-shaped double-layer air membrane, the membrane top (1) covering the foundation pit (6), and characterized in that: The foundation pit safety protection device also includes a membrane wall (2), a hoist (3), and a support mechanism (4); the membrane wall (2) is a long strip of double-layer plastic film; the membrane top (1) and the membrane wall (2) are both provided with an inflation port; the top of the membrane wall (2) is connected to the bottom frame of the membrane top (1); the bottom of the membrane wall (2) is wound in the hoist (3); the hoist (3) is fixed on the ground (5) outside the edge of the foundation pit (6); adjacent membrane walls (2) are connected as a whole and then wrap around the foundation pit (6) or the above-ground building (7); the membrane top A plurality of support pads (11) are evenly arranged at the inner bottom of (1); the support mechanism (4) is arranged at the bottom of the foundation pit (6) or the top surface of the above-ground building (7); the support pads (11) correspond to the support mechanism (4) one by one; the support mechanism (4) comprises a support column, a third arm (44), and a support plate (45); the support column comprises two groups, the support column comprises a column (41), an upper arm (42), a forearm (43), a base (46), a turntable 1 (48), and a turntable 2 (411); the column (41) The column (41) is vertically arranged, and a flange plate is arranged at the bottom of the column (41). The column (41) is fixed to the bottom of the foundation pit (6) or the top surface of the ground building (7) through the flange plate at the bottom. The base (46) is fixed to the top of the column (41). The turntable 1 (48) is installed in the base (46). The lower end of the upper arm (42) is connected to the turntable 1 (48) through a rotating shaft. The upper end of the upper arm (42) is connected to the lower end of the forearm (43) through a rotating shaft. The turntable 2 (411) is installed at the upper end of the forearm (43). The two sets of supports The second turntable (411) in the column is connected to the lower end of the third arm (44) via a rotating shaft, and the support plate (45) is arranged at the upper end of the third arm (44). The rotating shaft in the support column and the rotating shaft between the second turntable (411) and the third arm (44) are all provided with a fastening mechanism; a magnet or an electromagnet is arranged on the support plate (45), and a spiral coil is arranged in the support pad (11). The spiral coil is connected to a power supply via a switch, and the magnetic poles of the opposite surfaces of the support plate (45) and the support pad (11) have the same polarity.

2. A foundation pit safety protection device according to claim 1, characterized in that: The support column also includes a tightening nut (413), a fastening screw (419), and a gasket (47). A screw is arranged at the bottom of the turntable (48), and the screw passes through the base (46) and is connected to the tightening nut (413). The edge of the turntable (48) is evenly provided with a plurality of through threaded holes, and the fastening screw (419) is installed in the threaded holes on the edge of the turntable (48). The gasket (47) is arranged below the fastening screw (419), and the gasket (47) is arranged between the turntable (48) and the base (46).

3. A foundation pit safety protection device according to claim 2, characterized in that: The support column also includes a fastening nut (49) and a rotating shaft (412). One end of the rotating shaft (412) is provided with an external thread. The end of the rotating shaft (412) without a thread is fixed on the rotating disk (48). The end of the rotating shaft (412) with an external thread passes through the lower end of the upper arm (42) and is connected to the fastening nut (49).

4. A foundation pit safety protection device according to claim 3, characterized in that: The support column further comprises a friction pad (410), which is arranged on a rotating shaft (412) between a fastening nut (49) and an upper arm (42), and the friction pad (410) is made of rubber.

5. The foundation pit safety protection device according to claim 3 is characterized in that: The support column further comprises a second rotating shaft (414) and a second fastening nut (415). One end of the second rotating shaft (414) is provided with an external thread. The non-threaded end of the second rotating shaft (414) is fixed to the upper end of the upper arm (42). The end of the second rotating shaft (414) with the external thread passes through the lower end of the forearm (43) and is connected to the second fastening nut (415).

6. A foundation pit safety protection device according to claim 5, characterized in that: The support column also includes a tightening nut 2 (418), a fastening screw 2 (420), a rotating shaft 3 (416), and a fastening nut 3 (417). A screw is arranged at the bottom of the second turntable (411), and the screw passes through the top surface of the forearm (43) and is connected to the tightening nut 2 (418). The edge of the second turntable (411) is evenly provided with a plurality of through threaded holes, and the fastening screw 2 (420) is installed in the threaded holes on the edge of the second turntable (411). Two parallel mounting plates (441) are arranged at the lower end of the third arm (44), and one end of the rotating shaft 3 (416) is fixed on the second turntable (411), and the other end passes through a mounting plate (441) and is connected to the fastening nut 3 (417).

7. A foundation pit safety protection device according to claim 6, characterized in that: The sides of the fastening nut 1 (49), the fastening nut 2 (415) and the fastening nut 3 (417) are all provided with handles.

8. The foundation pit safety protection device according to claim 1 is characterized in that: The hoist (3) comprises a motor (31), a drum (32), an upper roller (33), a lower roller (34), and a frame (35); the motor (31) is mounted on the frame (35); the drum (32), the upper roller (33), and the lower roller (34) are mounted on the frame (35) via a bearing seat; the upper roller (33), the lower roller (34), and the drum (32) are arranged in parallel; the drum (32) is connected to an output shaft of the motor (31); and the upper roller (33) is arranged directly above the lower roller (34).

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