A foundation pit side wall anti-collapse support device and construction method thereof

Abstract

The present invention discloses a foundation pit side wall anti-collapse support device and a construction method thereof, which relates to the field of foundation pit anti-collapse, and comprises a support base and a movable protective frame, wherein the upper end of the support base is rotatably connected with the movable protective frame, and the movable protective frame is in contact with the foundation pit side wall for support; and a resistance docking rod is installed through the inner side of the support base. The foundation pit side wall anti-collapse support device and the construction method thereof, when the movable protective frame attached to the foundation pit side wall contacts the phenomenon of collapse of the side wall, the movable protective frame is forced to rotate inward along the upper end of the support base, thereby applying downward pressure to the contacting resistance docking rod, and the stressed movable protective frame is preliminarily supported in advance by the resistance docking rod, and the resistance docking rod is pressed and inserted into the bottom of the foundation pit by itself, thereby improving the support strength of the overall equipment, so that when the equipment contacts partial collapse, etc., the traditional fixed direct force support state is adaptively formed into a support state of active pressure relief.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit anti-collapse, and in particular to a foundation pit side wall anti-collapse support device and a construction method thereof. Background Art

[0002] During the construction of the foundation pit, it is necessary to adapt the corresponding anti-collapse support device to protect its side walls, so as to avoid damage to the personnel inside when collapse occurs. Therefore, the quality of the material determines the safety of the overall foundation pit.

[0003] Most of the existing anti-collapse support devices support the side walls of the foundation pit through their fixed support structures;

[0004] For example, a rock and soil engineering foundation pit anti-collapse stabilization support device with publication number CN114541411B includes a support device, which includes a plurality of linearly distributed columns and side plates and protective frames installed on the columns. The support device is installed in a foundation pit of earthwork, and a regular rectangular bottom pit is arranged at the lower end of the foundation pit. The columns include square support rods and cylindrical rods. A protective net is used to protect the soil blocks on the rock and soil side walls. Through built-in drainage holes, rainwater on the inclined surface of the foundation pit is uniformly recovered to avoid flooding of the bottom pit, thereby improving the stability of the columns and preventing the collapse of the support device.

[0005] Another example is the karst area foundation anti-collapse reinforcement device and reinforcement method with publication number CN116905524A. After the soil passes over the reinforcement plate and enters the first storage bucket, as the soil accumulates in the first storage bucket, the weight of the soil in the first storage bucket will exceed the storage weight threshold of the first storage bucket, so that the second limiting member is separated from the second storage bucket. Therefore, the collapsed soil can be collected by the first storage bucket and the second storage bucket, thereby effectively reinforcing the foundation pit, avoiding the impact of collapse on the foundation pit, and enhancing the quality of the anti-collapse function of the reinforcement device;

[0006] For example, the foundation pit support method at the bottom of an existing integrated pipe gallery with a publication number of CN115928749A belongs to the technical field of box culvert construction. The foundation pit support method at the bottom of an existing integrated pipe gallery includes an integrated pipe gallery, two working wells are arranged on both sides of the integrated pipe gallery, and a pipe curtain is arranged between the two corresponding working wells, and the two ends of the pipe curtain extend to the inside of the corresponding working wells and are provided with connecting lock buckles, and a plurality of horizontal angle braces are arranged between the outer periphery of the pipe curtain and one side of the corresponding working well, which can be used as the initial support of the cast-in-place box culvert by arranging a Z-shaped pipe curtain on the side of the foundation pit, and at the same time, the coordinated use of the load-bearing frame and the supporting crossbeam can greatly improve the foundation pit support strength of the lower part of the existing integrated pipe gallery, so that the construction of the box culvert is safer and more reliable;

[0007] Most of the above-mentioned existing technologies have improved their overall structure, while the existing foundation pit side wall anti-collapse support device has a relatively fixed support range during operation. When encountering partial landslides, the support state is directly subjected to force, which makes it more likely that the support strength will be insufficient. In addition, the support range cannot be adaptively extended according to the landslide situation, and thus it is impossible to effectively protect the personnel or equipment in the foundation pit, and thus there are certain limitations in use. Summary of the invention

[0008] The purpose of the present invention is to provide a foundation pit side wall anti-collapse support device and a construction method thereof, so as to solve the problem proposed in the above background technology that during the operation, its support range is relatively fixed, and when it encounters partial collapse, the support state of direct force makes it more likely to have insufficient support strength, and its support range cannot be adaptively extended according to the collapse situation, thereby failing to effectively protect the personnel or equipment in the foundation pit.

[0009] To achieve the above object, the present invention provides the following technical solution: a foundation pit side wall anti-collapse support device, comprising a support base and a movable protection frame, wherein the upper end of the support base is rotatably connected to the movable protection frame, and the movable protection frame is in contact with and supports the foundation pit side wall;

[0010] A resistance docking rod is installed through the inner side of the support base, and the lower end of the resistance docking rod is in nested contact with the soil at the bottom of the foundation pit, a fixed sleeve rod is fixedly connected to the upper surface of the support base, and the inner side of the fixed sleeve rod is bonded with a first support airbag assembly, and the upper end of the first support airbag assembly is bonded with a movable docking rod, and the movable docking rod is nested and docked with the inner side of the fixed sleeve rod, a first air supply hose is penetrated through the outer side of the first support airbag assembly, and the first air supply hose is penetrated along the inside of the support base, an auxiliary self-locking structure is arranged on the inner side of the upper end of the support base, and the supporting angle of the movable protective frame is limited by the auxiliary self-locking structure;

[0011] The upper end of the movable protection frame is rotatably connected to an extended protection net assembly, and a self-moving structure is provided between the extended protection net assembly and the movable protection frame, and the protection range of the extended protection net assembly is adaptively controlled by the self-moving structure.

[0012] Furthermore, the auxiliary self-locking structure is provided with a second support airbag assembly, and the second support airbag assembly is adhesively connected to the inner side of the upper end of the support base, the upper end inner wall of the support base is provided with an accommodating guide groove, and the upper end of the second support airbag assembly extends to the inner side of the accommodating guide groove, the upper end of the second support airbag assembly is docked with a nested connector, and the nested connector is arranged on the inner side of the accommodating guide groove.

[0013] Furthermore, a vertical corrugated support docking airbag is adhesively connected to the inner upper end of the accommodating guide groove, and the positions of the vertical corrugated support docking airbag and the nested connecting piece correspond to each other; a limited movable part is nested and installed on the upper end of the support base, and a preset limit groove is opened on the outer side of the axial end of the movable protective frame, and the preset limit grooves are distributed at equal angles about the center point of the movable protective frame, and the positions of the preset limit grooves and the limit movable part correspond to each other.

[0014] Furthermore, when the movable protective frame is rotated under force, the inner side applies downward pressure to the contacting docking rod, and the protruding structure on the outer side of the docking rod simultaneously squeezes the movable docking rod, so that the movable docking rod applies pressure along the upper end of the first support airbag assembly, and the first support airbag assembly is supplied with air through the first air supply hose and the interior of the second support airbag assembly.

[0015] Furthermore, the expansion of the second supporting airbag assembly pushes the nested connector to move upward along the accommodating guide groove, and the bottom of the nested connector applies pressure to the contacting limiting movable part, so that the limiting movable part is limited along the preset limiting groove of the docking angle on the outer side of the movable protective frame.

[0016] Furthermore, the self-movable structure is provided with a second air supply hose, and the second air supply hose is arranged on the inner side of the vertical corrugated support docking airbag, and the second air supply hose passes through along the outer side of the movable protective frame, the inner wall of the movable protective frame is bonded with a reserved corrugated airbag, and the reserved corrugated airbag and the end of the second air supply hose are connected to each other; the lower end of the reserved corrugated airbag is docked with a nested movable part, and the nested movable part is arranged on the inner side of the movable protective frame, the upper end of the nested movable part is docked with a docking steel wire rope, and the docking steel wire rope passes through along the inside of the movable protective frame, and the end of the docking steel wire rope is docked with the upper end of the extended protective net assembly.

[0017] Furthermore, the lower end of the extended protective net assembly is docked with a preset steel wire rope, and the preset steel wire rope extends along the interior of the movable protective frame, a movable docking shaft is installed on the inner wall of the movable protective frame, and the movable docking shaft and the end of the preset steel wire rope are docked with each other, and a torsion spring is nested on the outer side of the movable docking shaft.

[0018] Furthermore, during the process in which the vertical corrugated support docking airbag is compressed, air is supplied to the interior of the reserved corrugated airbag through the second air supply hose, so that the reserved corrugated airbag expands and pushes the nested movable part to move downward, and the nested movable part forms a traction structure with the outer end of the extended protection net assembly through the docking wire rope.

[0019] A construction method of a foundation pit side wall anti-collapse support device, comprising the following steps:

[0020] S1: When the side wall of the landslide is in contact with the collapse phenomenon, the movable protection frame is forced to rotate inward along the upper end of the support base, thereby exerting downward pressure on the contacting docking rod, and the contacting docking rod preliminarily supports the stressed movable protection frame, and the traditional fixed direct force support state is adaptively formed into a support state of movable pressure relief;

[0021] S2: The movable protective frame applies downward pressure to the contacting docking rod, and at the same time, its outer side moves to a certain position to simultaneously apply pressure to the movable docking rod;

[0022] S3: The movable docking rod squeezes the first supporting airbag assembly in contact, and the expanded second supporting airbag assembly pushes the nested connecting member upward, exerting force on the contacting limiting movable member, so that the limiting movable member is limited along the preset limiting groove of the docking angle on the outer side of the movable protective frame, thereby self-locking support when a collapse state is formed;

[0023] S4: When the nested connector that is forced to move upward applies pressure to the vertical corrugated support docking airbag, the reserved corrugated airbag is inflated through the second air supply hose to push the nested movable part to move downward. The nested movable part drives the outer end of the extended protection net assembly to expand outward along the upper end of the movable protection frame through the docking wire rope, thereby forming a larger support range to prevent falling rocks and other objects from contacting users of internal protection.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The foundation pit side wall anti-collapse support device and the construction method thereof are provided with an auxiliary self-locking structure. When the movable protection frame attached to the foundation pit side wall contacts the collapse of the collapsed side wall, the movable protection frame is forced to rotate inward along the upper end of the support base, thereby applying downward pressure to the contacting resistance docking rod, and the stressed movable protection frame is preliminarily supported by the resistance docking rod in advance, and the resistance docking rod is pressed and inserted into the bottom of the foundation pit by itself, thereby improving the support strength of the overall equipment, so that when the equipment contacts partial collapse, the traditional fixed direct force support state is adaptively formed into a support state of active pressure relief;

[0026] Furthermore, while the movable protective frame applies downward pressure to the contacting resistance docking rod, its outer side moves to a certain position to simultaneously apply pressure to the movable docking rod, so that the movable docking rod squeezes the contacting first support airbag assembly, so that it supplies air to the inside of the second support airbag assembly through the first air supply hose. At this time, the inflated second support airbag assembly pushes the nested connector upward, and applies force to the contacting limiting movable part, so that the limiting movable part is limited along the preset limiting groove of the docking angle on the outer side of the movable protective frame, so that self-locking support is provided when a collapse state is formed, avoiding the direct collapse of the equipment. The support range is adaptively moved according to the collapse situation, and the personnel or equipment in the foundation pit are effectively protected.

[0027] Furthermore, a self-moving structure is provided. During the process of the nested connecting part that is forced to move upward and pressurizes the vertical corrugated support docking airbag, it will supply air to the interior of the reserved corrugated airbag through the second air supply hose, so that the reserved corrugated airbag will expand and push the nested movable part to move downward. While the nested movable part is under force, it will drive the outer end of the extended protection net assembly to expand outward along the upper end of the movable protection frame through the docking wire rope, thereby forming a larger support range, preventing falling rocks and the like from contacting the users who are protecting inside, providing a safe environment for the users, and the lower end of the extended protection net assembly can effectively increase its bearing capacity through the support state of the preset wire rope and the torsion spring, avoid easy damage, and further improve the overall support and protection safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0029] Figure 2 This is a schematic diagram of a half-cut three-dimensional structure of a support base of the present invention;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the butt-jointed steel wire ropes of the present invention;

[0031] Figure 4 This is a schematic diagram of a half-section three-dimensional structure of a movable protective frame of the present invention;

[0032] Figure 5 It is a schematic diagram of the three-dimensional structure of the second air supply hose of the present invention;

[0033] Figure 6 This is a schematic diagram of the three-dimensional structure of the interference docking rod of the present invention;

[0034] Figure 7 It is a schematic diagram of the three-dimensional structure of the first supporting airbag assembly of the present invention;

[0035] Figure 8 This is a schematic diagram of the three-dimensional structure of the movable docking shaft of the present invention;

[0036] Fig. 9 It is a schematic diagram of the three-dimensional structure of the limiting movable part of the present invention;

[0037] Fig.10 It is a schematic diagram of the three-dimensional structure of the nested movable parts of the present invention.

[0038] In the figure: 1. Support base; 2. Movable protective frame; 3. Interference docking rod; 4. Fixed sleeve rod; 5. First support airbag assembly; 6. Movable docking rod; 7. First air supply hose; 8. Second support airbag assembly; 9. Nested connector; 10. Vertical corrugated support docking airbag; 11. Limiting movable part; 12. Preset limiting groove; 13. Accommodating guide groove; 14. Second air supply hose; 15. Reserved corrugated airbag; 16. Nested movable part; 17. Docking wire rope; 18. Extension protection net assembly; 19. Preset wire rope; 20. Movable docking shaft; 21. Torsion spring. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0040] Example 1: Please refer to Figure 1-10 The present invention provides the following technical solutions: a foundation pit side wall anti-collapse support device, comprising a support base 1, a movable protection frame 2, a resistance docking rod 3, a fixed sleeve rod 4, a first support airbag assembly 5, a movable docking rod 6, a first air supply hose 7, a second support airbag assembly 8, a nested connector 9, a vertical corrugated support docking airbag 10, a limiting movable part 11, a preset limiting groove 12, an accommodating guide groove 13, a second air supply hose 14, a reserved corrugated airbag 15, a nested movable part 16, a docking steel wire rope 17, an extended protection net assembly 18, a preset steel wire rope 19, a movable docking shaft 20 and a torsion spring 21;

[0041] The upper end of the support base 1 is rotatably connected with a movable protective frame 2, and the movable protective frame 2 is in contact with the side wall of the foundation pit for support; a resistance docking rod 3 is installed through the inner side of the support base 1, and the lower end of the resistance docking rod 3 is in nested contact with the soil at the bottom of the foundation pit, a fixed sleeve rod 4 is fixedly connected to the upper surface of the support base 1, and the inner side of the fixed sleeve rod 4 is bonded with a first support airbag assembly 5, and the upper end of the first support airbag assembly 5 is bonded with a movable docking rod 6, and the movable docking rod 6 is nested and docked with the inner side of the fixed sleeve rod 4, a first air supply hose 7 is penetrated through the outer side of the first support airbag assembly 5, and the first air supply hose 7 is penetrated along the inside of the support base 1, and an auxiliary self-locking structure is provided on the inner side of the upper end of the support base 1, and the supporting angle of the movable protective frame 2 is limited by the auxiliary self-locking structure;

[0042] The upper end of the movable protection frame 2 is rotatably connected to the extended protection net assembly 18, and a self-moving structure is provided between the extended protection net assembly 18 and the movable protection frame 2, and the protection range of the extended protection net assembly 18 is adaptively controlled by the self-moving structure.

[0043] A construction method of a foundation pit side wall anti-collapse support device, comprising the following steps:

[0044] S1: When the side wall of the landslide is in contact with the collapse phenomenon, the movable protection frame 2 is forced to rotate inward along the upper end of the support base 1, thereby exerting downward pressure on the contacting docking rod 3, and the contacting docking rod 3 preliminarily supports the stressed movable protection frame 2 in advance, and the traditional fixed direct force support state is adaptively formed into a support state of active pressure relief;

[0045] S2: The movable protection frame 2 applies downward pressure to the contacting docking rod 3, and at the same time, its outer side moves to a certain position to simultaneously apply pressure to the movable docking rod 6;

[0046] S3: The movable docking rod 6 squeezes the first supporting airbag assembly 5 in contact, and the expanded second supporting airbag assembly 8 pushes the nested connecting member 9 upward, exerting force on the contacting limiting movable member 11, so that the limiting movable member 11 is limited along the preset limiting groove 12 of the docking angle on the outer side of the movable protective frame 2, thereby forming a self-locking support when a collapse state is formed;

[0047] S4: When the nested connector 9 is forced to move upward, the reserved corrugated airbag 15 is expanded through the second air supply hose 14 to push the nested movable part 16 to move downward. The nested movable part 16 drives the outer end of the extended protection net assembly 18 to expand outward along the upper end of the movable protection frame 2 through the docking wire rope 17, thereby forming a larger support range to prevent falling rocks from contacting the users of the internal protection.

[0048] Embodiment 2: Based on Embodiment 1, an auxiliary self-locking structure is also disclosed, and its specific structure is as follows:

[0049] The auxiliary self-locking structure is provided with a second support airbag assembly 8, and the second support airbag assembly 8 is bonded to the inner side of the upper end of the support base 1. The inner wall of the upper end of the support base 1 is provided with a receiving guide groove 13, and the upper end of the second support airbag assembly 8 extends to the inner side of the receiving guide groove 13. The upper end of the second support airbag assembly 8 is butted with a nested connector 9, and the nested connector 9 is arranged on the inner side of the receiving guide groove 13. A vertical corrugated support butt airbag 10 is bonded to the upper end of the inner side of the receiving guide groove 13, and the positions of the vertical corrugated support butt airbag 10 and the nested connector 9 correspond to each other; a limited movable part 11 is nested and installed on the upper end of the support base 1, and a preset limiting groove 12 is provided on the outer side of the shaft end of the movable protective frame 2, and the preset limiting groove 12 is distributed at equal angles with respect to the center point of the movable protective frame 2, and the positions of the preset limiting groove 12 and the limiting movable part 11 correspond to each other. When the movable protective frame 2 is rotated under force, the inner side presses downward on the contacting docking rod 3, and the convex structure on the outer side of the contacting docking rod 3 squeezes the movable docking rod 6 synchronously, so that the movable docking rod 6 presses along the upper end of the first support airbag assembly 5, and the first support airbag assembly 5 is supplied with air through the first air supply hose 7 and the inside of the second support airbag assembly 8. The second support airbag assembly 8 expands and pushes the nested connector 9 to move upward along the accommodating guide groove 13, and the bottom of the nested connector 9 presses on the contacting limiting movable member 11, so that the limiting movable member 11 is limited along the preset limiting groove 12 of the docking angle on the outer side of the movable protective frame 2. When the movable protective frame 2 attached to the side wall of the foundation pit contacts the collapse of the side wall, the movable protective frame 2 is forced to rotate inward along the upper end of the supporting base 1, thereby applying downward pressure to the contacting abutting rod 3, and the movable protective frame 2 under force is preliminarily supported by the abutting rod 3, and the abutting rod 3 is pressed to automatically insert into the bottom of the foundation pit, thereby improving the supporting strength of the overall equipment, so that when the equipment contacts partial landslides, the traditional fixed direct force support state is adaptively formed into a support state with active pressure relief; while the movable protective frame 2 applies downward pressure to the contacting abutting rod 3, its outer side moves to a certain position to support the movable abutting rod 6 applies pressure synchronously, so that the movable docking rod 6 squeezes the first supporting airbag assembly 5 in contact, so that it supplies air to the inside of the second supporting airbag assembly 8 through the first air supply hose 7. At this time, the expanded second supporting airbag assembly 8 pushes the nested connecting member 9 to move upward, and applies force to the contacting limiting movable member 11, so that the limiting movable member 11 is limited along the preset limiting groove 12 of the docking angle on the outer side of the movable protective frame 2, so as to self-lock the support when a landslide state is formed, avoiding the direct collapse of the equipment. The support range is adaptively moved according to the landslide situation, and the personnel or equipment in the foundation pit are effectively protected;

[0050] Embodiment 3: Based on Embodiment 2, a self-moving structure is also disclosed, and its specific structure is as follows:

[0051] The self-movable structure is provided with a second air supply hose 14, and the second air supply hose 14 is arranged on the inner side of the vertical corrugated support docking airbag 10, and the second air supply hose 14 passes through along the outer side of the movable protective frame 2, and the inner wall of the movable protective frame 2 is bonded with a reserved corrugated airbag 15, and the end of the reserved corrugated airbag 15 and the second air supply hose 14 are connected to each other; the lower end of the reserved corrugated airbag 15 is docked with a nested movable part 16, and the nested movable part 16 is arranged on the inner side of the movable protective frame 2, the upper end of the nested movable part 16 is docked with a docking wire rope 17, and the docking wire rope 17 passes through along the inside of the movable protective frame 2, and the end of the docking wire rope 17 is docked with the upper end of the extended protective net assembly 18.

[0052] The lower end of the extended protection net assembly 18 is docked with a preset steel wire rope 19, and the preset steel wire rope 19 extends along the inside of the movable protection frame 2. A movable docking shaft 20 is installed on the inner wall of the movable protection frame 2, and the movable docking shaft 20 and the end of the preset steel wire rope 19 are docked with each other, and a torsion spring 21 is nested and installed on the outer side of the movable docking shaft 20. During the process of the vertical corrugated support docking airbag 10 being compressed, air is supplied to the inside of the reserved corrugated airbag 15 through the second air supply hose 14, so that the reserved corrugated airbag 15 expands and pushes the nested movable part 16 to move downward, and the nested movable part 16 forms a traction structure with the outer end of the extended protection net assembly 18 through the docking steel wire rope 17. When the nested connecting part 9 that is forced to move upward applies pressure to the vertical corrugated support docking airbag 10, it will supply air to the interior of the reserved corrugated airbag 15 through the second air supply hose 14, so that the reserved corrugated airbag 15 will expand and push the nested movable part 16 to move downward. While the nested movable part 16 is under force, it will drive the outer end of the extended protection net assembly 18 to expand outward along the upper end of the movable protection frame 2 through the docking wire rope 17, thereby forming a larger support range to prevent falling rocks from contacting the users who are protecting themselves inside, providing a safe environment for the users, and the lower end of the extended protection net assembly 18 can effectively increase its bearing capacity and avoid easy damage through the support state of the preset wire rope 19 and the torsion spring 21.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A foundation pit side wall anti-collapse support device, comprising a support base (1) and a movable protection frame (2), wherein the upper end of the support base (1) is rotatably connected to the movable protection frame (2), and the movable protection frame (2) is in contact with and supports the foundation pit side wall; characterized in that: A resistance docking rod (3) is installed through the inner side of the support base (1), and the lower end of the resistance docking rod (3) is nested and in contact with the soil at the bottom of the foundation pit; a fixed sleeve rod (4) is fixedly connected to the upper surface of the support base (1), and the inner side of the fixed sleeve rod (4) is bonded to a first support airbag assembly (5), and the upper end of the first support airbag assembly (5) is bonded to a movable docking rod (6), and the movable docking rod (6) is nested and docked with the inner side of the fixed sleeve rod (4); a first air supply hose (7) is penetrated through the outer side of the first support airbag assembly (5), and the first air supply hose (7) is penetrated along the inside of the support base (1); an auxiliary self-locking structure is provided on the inner side of the upper end of the support base (1), and the supporting angle of the movable protective frame (2) is limited by the auxiliary self-locking structure; The upper end of the movable protection frame (2) is rotatably connected to an extended protection net assembly (18), and a self-moving structure is provided between the extended protection net assembly (18) and the movable protection frame (2), and the protection range of the extended protection net assembly (18) is adaptively controlled by the self-moving structure; The auxiliary self-locking structure is provided with a second support airbag assembly (8), and the second support airbag assembly (8) is bonded to the inner side of the upper end of the support base (1), the inner wall of the upper end of the support base (1) is provided with a receiving guide groove (13), and the upper end of the second support airbag assembly (8) extends to the inner side of the receiving guide groove (13), and the upper end of the second support airbag assembly (8) is butt-jointed with a nested connector (9), and the nested connector (9) is arranged on the inner side of the receiving guide groove (13); The upper inner end of the accommodating guide groove (13) is bonded with a vertical corrugated support docking airbag (10), and the positions of the vertical corrugated support docking airbag (10) and the nested connector (9) correspond to each other; A limit movable part (11) is nested and installed at the upper end of the support base (1), and a preset limit groove (12) is provided on the outer side of the shaft end of the movable protective frame (2), and the preset limit grooves (12) are distributed at equal angles with respect to the center point of the movable protective frame (2), and the positions of the preset limit grooves (12) and the limit movable part (11) correspond to each other; When the movable protective frame (2) is rotated under force, the inner side applies downward pressure to the contacting docking rod (3), and the protruding structure on the outer side of the contacting docking rod (3) simultaneously squeezes the movable docking rod (6), so that the movable docking rod (6) applies pressure along the upper end of the first support airbag assembly (5), and the first support airbag assembly (5) is supplied with air through the first air supply hose (7) and the interior of the second support airbag assembly (8); The second supporting airbag assembly (8) expands to push the nested connecting member (9) to move upward along the accommodating guide groove (13), and the bottom of the nested connecting member (9) applies pressure to the contacting limiting movable member (11), so that the limiting movable member (11) is limited along the preset limiting groove (12) at the outer docking angle of the movable protective frame (2); The self-movable structure is provided with a second air supply hose (14), and the second air supply hose (14) is arranged on the inner side of the vertical corrugated support docking airbag (10), and the second air supply hose (14) passes through the outer side of the movable protective frame (2), and the inner wall of the movable protective frame (2) is bonded and connected with a reserved corrugated airbag (15), and the reserved corrugated airbag (15) and the end of the second air supply hose (14) are connected to each other; The lower end of the reserved corrugated airbag (15) is butt-jointed with a nested movable part (16), and the nested movable part (16) is arranged on the inner side of the movable protection frame (2); the upper end of the nested movable part (16) is butt-jointed with a butt-jointed steel wire rope (17), and the butt-jointed steel wire rope (17) runs through the inside of the movable protection frame (2), and the end of the butt-jointed steel wire rope (17) is butt-jointed with the upper end of the extended protection net assembly (18).

2. The foundation pit side wall anti-collapse support device according to claim 1, characterized in that: The lower end of the extended protection net assembly (18) is butt-jointed with a preset steel wire rope (19), and the preset steel wire rope (19) extends along the interior of the movable protection frame (2), a movable butt-jointed shaft (20) is installed on the inner wall of the movable protection frame (2), and the movable butt-jointed shaft (20) and the end of the preset steel wire rope (19) are butt-jointed with each other, and a torsion spring (21) is nested and installed on the outer side of the movable butt-jointed shaft (20).

3. A foundation pit side wall anti-collapse support device according to claim 2, characterized in that: During the process of the vertical corrugated support docking airbag (10) being pressurized, air is supplied to the interior of the reserved corrugated airbag (15) through the second air supply hose (14), so that the reserved corrugated airbag (15) expands and pushes the nested movable part (16) to move downward, and the nested movable part (16) forms a traction structure with the outer end of the extended protection net component (18) through the docking steel wire rope (17).

4. A construction method for a foundation pit side wall anti-collapse support device, characterized in that: The construction method is implemented based on the foundation pit side wall anti-collapse support device according to any one of claims 1 to 3, and the specific method steps are as follows: S1: When the side wall of the landslide is in contact with the collapse phenomenon, the movable protection frame (2) is forced to rotate inward along the upper end of the support base (1), thereby exerting downward pressure on the contacting docking rod (3), and the movable protection frame (2) under force is preliminarily supported by the docking rod (3), and the traditional fixed direct force support state is adaptively formed into a support state of movable pressure relief; S2: The movable protective frame (2) applies downward pressure to the contacting docking rod (3), and at the same time, its outer side moves to a certain position to simultaneously apply pressure to the movable docking rod (6); S3: allowing the movable docking rod (6) to squeeze the first supporting airbag assembly (5) in contact, and the expanded second supporting airbag assembly (8) pushes the nested connecting member (9) upward, exerting force on the contacting limiting movable member (11), so that the limiting movable member (11) is limited along the preset limiting groove (12) of the docking angle on the outer side of the movable protective frame (2), thereby forming a self-locking support when a collapse state is formed; S4: When the nested connector (9) is forced to move upward and applies pressure to the vertical corrugated support docking airbag (10), the reserved corrugated airbag (15) is expanded through the second air supply hose (14) to push the nested movable part (16) to move downward. The nested movable part (16) drives the outer end of the extended protection net assembly (18) to expand outward along the upper end of the movable protection frame (2) through the docking wire rope (17), thereby forming a larger support range to prevent falling rocks from contacting users of internal protection.

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