A foundation pit support structure and a foundation pit construction method

Abstract

The present invention discloses a foundation pit support structure, including a bottom ring. A plurality of backing plates are provided on the top of the bottom ring. Support rods are provided on the top of each backing plate. A fixed support ring is provided between the tops of the support rods. A pressure ring is provided below the bottom ring. A plurality of support rods are provided on the top of the pressure ring. Cross frames are provided on the top of each support rod. A conical support gyro is provided between one ends of the cross frames. A drill bit one is provided at the bottom of the conical support gyro. The drill bit one extends below the pressure ring. The other ends of the cross frames are respectively fixed on the corresponding inner ends of the bottom ring. An air-powered stabilizing device is provided on the top of the conical support gyro. Advantageous effects: In addition to the supporting effect, the overall support structure also has very good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more specifically, to a foundation pit support structure and a foundation pit construction method. Background Art

[0002] At present, during the excavation of a foundation pit, it is easy to cause deformation of the surrounding soil mass, which affects the surrounding buildings and underground pipelines. Foundation pit support is a retaining, reinforcement, and protection measure adopted for the side wall of the foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit.

[0003] A foundation pit support structure disclosed in a Chinese invention with the publication number CN104294828B in related technologies includes a bottom plate, a support base, a support member, a support frame, a rectangular pipe, and a protective plate. The support frame includes a bracket and a second connection block. The second connection block is bent into a U shape by a steel plate. The bracket as a whole is bent into a U-shaped frame by a round steel, including a connecting portion and a positioning portion. The connecting portion is two straight round steel bars welded at intervals to the bottom of the U-shaped second connection block, and the two straight round steel bars are respectively parallel to the two side walls of the U-shaped second connection block. Both positioning portions are U-shaped round steel bars with the two open ends fixedly connected to the same end of the two straight round steel bars respectively; two rectangular pipes are welded in parallel at intervals on one side of the protective plate. The inner sides of the positioning portions of the bracket are respectively attached to the two rectangular pipes, and a pin penetrates through the bottom of the second connection block and the protective plate, and a pin piece is inserted into one end of the pin close to the protective plate to fix the bracket and the protective plate. This foundation pit support structure is simple in operation and convenient for installation, which is beneficial to improving construction efficiency. However, after being subjected to simultaneous pressure and vibration from the upper part and the surrounding, this kind of support will result in insufficient stability, easily causing instability of the lower part inside the foundation pit, thereby reducing the stability of the support for the lower part inside the foundation pit. Once the lower part inside the foundation pit is unstable due to pressure, it will seriously affect the overall stability and safety inside the foundation pit. Summary of the Invention

[0004] The technical task of the present invention is to address the above deficiencies and provide a foundation pit support structure and a foundation pit construction method to solve the above problems.

[0005] The technical solution of the present invention is realized as follows:

[0006] According to one aspect of the present invention, a foundation pit support structure is provided.

[0007] The foundation pit support structure includes a bottom ring. A number of cushion plates are provided at the top of the bottom ring. Support rods are provided at the tops of the cushion plates. A fixed support ring is provided between the tops of the support rods. A pressure ring is provided below the bottom ring. A number of support rods are provided at the top of the pressure ring. Cross frames are provided at the tops of the support rods. A conical support gyro is provided between one ends of the cross frames. A drill bit one is provided at the bottom of the conical support gyro. The drill bit one extends below the pressure ring. The other ends of the cross frames are respectively fixed on the corresponding inner ends of the bottom ring. An air-actuated stabilizing device is provided at the top of the conical support gyro.

[0008] Preferably, the cross-sectional diameter of the pressure ring is smaller than that of the bottom ring. A number of grid holes are provided on the outer side of the bottom ring. The top surface and the side surface of the grid holes are in communication.

[0009] Preferably, the air-actuated stabilizing device includes a support disc. A through hole is provided in the middle of the support disc. An air-actuated connecting pipe is inserted in the through hole. The top of the air-actuated connecting pipe is connected to an air-actuated bellows type air pump. The air pump is provided on the top of the support disc. The bottom of the air-actuated connecting pipe is connected to an airbag two. The bottom end of the airbag two is connected to an expansion mechanism.

[0010] Preferably, at least four convex blocks are provided on the side of the fixed support ring. Any adjacent group of the support rods are fixed on the bottom ring in a V-shaped structure. Connection ends are provided at the tops of the support rods. Triangular heads are provided at the tops of the connection ends. A fixing plate is provided between any adjacent group of triangular heads. The fixing plates are respectively fixed at the bottoms of the convex blocks.

[0011] Preferably, an outer frame is welded at the outer edge of the fixed support ring. An inner frame is provided inside the outer frame. The inner frame is welded on the inner wall of the outer side of the fixed support ring. An airbag is provided between the inner frame and the outer frame. One end of the airbag close to the inner frame is connected to a high-pressure gas cylinder. The high-pressure gas cylinder is installed at one inner end of the inner frame. An automatic inflation valve is provided between the high-pressure gas cylinder and the airbag.

[0012] Preferably, the expansion mechanism includes a number of chutes provided on the circumference of the top of the conical support gyro. Sliding plates matched with the chutes are provided in the chutes. Drill bits two are provided at the outer ends of the sliding plates. Side gear ridges are provided at the centers of the tops of the sliding plates. Limit holes are provided at the teeth of the side gear ridges close to one end of the airbag two. One ends of the side gear ridges close to the airbag two are respectively fixed at the corresponding ends of the bottom of the airbag two. Gears meshing with the side gear ridges are provided on one side of the side gear ridges. Gear shafts are inserted through the middle of the gears. The tops of the gear shafts are respectively fixed at the corresponding ends of the bottom of the support disc. Limit rods matched with the limit holes are provided at the outer ends of the gears.

[0013] Preferably, at least four bumps are provided on the side of the fixed support ring. Any adjacent group of the support rods are fixed on the bottom ring in a V-shaped structure. Connection ends are provided at the tops of the support rods, and triangular heads are provided at the tops of the connection ends. Fixing plates are provided between any adjacent group of triangular heads, and the fixing plates are respectively fixed at the bottoms of the bumps.

[0014] Preferably, an outer frame is provided at the outer edge of the fixed support ring. An inner frame is provided inside the outer frame, and the inner frame is fixed on the outer inner wall of the fixed support ring. An airbag I is provided between the inner frame and the outer frame. One end of the airbag I close to the inner frame is connected to a high-pressure gas cylinder, and the high-pressure gas cylinder is installed at one end inside the inner frame. An automatic inflation valve is provided between the high-pressure gas cylinder and the airbag I.

[0015] Preferably, the inner frame is made of a rigid material, the outer frame is made of a soft material, and a plurality of insertion rods are provided on the outer side of the outer frame.

[0016] According to another aspect of the present invention, a construction method of a foundation pit support structure is provided.

[0017] The construction method of the foundation pit support structure includes the following steps:

[0018] Insert the first drill bit into the soil at the bottom of the foundation pit;

[0019] At the same time, bring the pressing ring into the soil layer to urge the bottom ring to support the inner bottom surface of the foundation pit;

[0020] The lower part of the conical support gyro is immersed in the bottom of the foundation pit under the action of the first drill bit;

[0021] The support rods at the top of the bottom ring support the foundation pit wall;

[0022] The support plate is located inside the support rods and is stuck at the lower position between the support rods;

[0023] Pour a liquid substance into the airbag I provided between the outer frame and the inner frame, so that the airbag I automatically starts the automatic inflation valve when it contacts the liquid substance, and the high-pressure gas cylinder automatically inflates the airbag I;

[0024] The inflated airbag I undergoes a strong expansion movement and presses against the outer outer frame;

[0025] The outer frame is pushed out strongly and the insertion rods on the side are inserted into the foundation pit wall during the pushing out process;

[0026] The fixed support ring is fixedly stuck at the upper part inside the foundation pit through the action of the insertion rods;

[0027] When injected with upper liquid or externally fed with materials, the air pump on the top of the pressing support plate is pressed. Under the action of pressure or gravity, the air pump inflates the inside of the second airbag through the pneumatic connecting pipe;

[0028] After the second airbag is inflated, it expands, and the side gear ridges connected to the bottom are pushed outwards as it expands;

[0029] The side gear ridges drive the sliding plate at the bottom to slide outwards in the chute, and finally insert the second drill bit through the support rods and into the foundation pit wall;

[0030] Support and enclose the foundation pit wall.

[0031] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0032] This foundation pit support is supported by a gyro-shaped support structure at the bottom. When subjected to pressure from above or around, this gyro-shaped support structure can play a very good role in stabilizing, thus effectively protecting the stability at the bottom of the foundation pit and avoiding the phenomenon of depression at the bottom of the foundation pit caused by external factors. At the same time, the support rods surrounding the foundation pit wall can better play the role of support and stability under the support structure formed by the conical support gyro, making the entire support structure have good stability in addition to the support effect.

[0033] In this foundation pit support, when injecting liquid materials, the first airbag automatically inflates. After inflation, the first airbag will push the outer frame outwards. Through the insertion rods on the outer side of the outer frame and the action of the outer frame, the upper part of the inner wall of the foundation pit is firmly drilled. At the same time, under the action of the pressure and gravity of the flowing liquid or materials, the pneumatic stabilizing device below is driven, prompting the pneumatic stabilizing device to push the second drill bit into the inner wall of the lower part of the foundation pit after it is opened. In this way, both the upper and lower parts of the foundation pit are stabilized, thereby further increasing the enclosure of the foundation pit wall and effectively avoiding the problems of collapse or loosening of the side wall and bottom of the foundation pit caused by external factors, improving the overall safety inside the foundation pit.

[0034] In this foundation pit support, a number of cushion plates are provided on the bottom ring, and two support rods are provided on each cushion plate. These two support rods are fixed in a V-shaped structure, so that the top ends of two adjacent support rods are set together, making the entire support rods form a mesh structure. The foundation pit wall is surrounded by this V-shaped mesh structure, increasing the contact surface of the enclosure. At the same time, the inclined enclosure has better support performance, and compared with the traditional straight enclosure, the inclined enclosure has better enclosure performance. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 is the overall structural schematic diagram according to an embodiment of the present invention;

[0037] Figure 2 is the exploded view of the connection end of the conical pneumatic stabilizing device according to an embodiment of the present invention;

[0038] Figure 3 is the structural schematic diagram of the support structure end of the conical support gyro according to an embodiment of the present invention;

[0039] Figure 4 is the top view of the fixed support ring according to an embodiment of the present invention;

[0040] Figure 5 is the structural schematic diagram of the bottom ring connection end according to an embodiment of the present invention;

[0041] Figure 6 is according to Figure 5 the partial enlarged view of A in

[0042] Figure 7 is the structural schematic diagram of the expansion mechanism according to an embodiment of the present invention;

[0043] Figure 8 is the structural schematic diagram of the top surface of the conical support gyro according to an embodiment of the present invention.

[0044] In the figure:

[0045] 1. Bottom ring; 2. Backing plate; 3. Support rod; 4. Fixed support ring; 5. Pressure ring; 6. Support rod; 7. Cross frame; 8. Conical support gyro; 9. Drill bit 1; 10. Grid hole; 11. Support disk; 12. Protrusion; 13. Connection end; 14. Triangular head; 15. Fixed plate; 16. Outer frame; 17. Inner frame; 18. Airbag 1; 19. Insert rod; 20. High-pressure gas cylinder; 21. Automatic inflation valve; 22. Pneumatic stabilizing device; 23. Through hole; 24. Pneumatic connecting pipe; 25. Air pump; 26. Airbag 2; 27. Expansion mechanism; 28. Slide groove; 29. Slide plate; 30. Drill bit 2; 31. Side gear rib; 32. Limit hole; 33. Gear; 34. Gear shaft; 35. Limit rod; 36. Battery; 37. Outer shell; 38. Cylinder; 39. Air rod; 40. Solar photovoltaic panel mounting plate; 41. Solar photovoltaic panel; 42. LED light strip. Detailed implementation manners

[0046] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0047] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0048] According to an embodiment of the present invention, a foundation pit support structure is provided.

[0049] As Figure 1-8 shown in:

[0050] The present invention provides a foundation pit support structure, including a bottom ring 1. A plurality of backing plates 2 are provided on the top of the bottom ring 1. Support rods 3 are provided on the tops of the backing plates 2. A fixed support ring 4 is provided between the tops of the support rods 3. A pressure ring 5 is provided below the bottom ring 1. A plurality of support rods 6 are provided on the top of the pressure ring 5. Cross frames 7 are provided on the tops of the support rods 6. A conical support gyro 8 is provided between one ends of the cross frames 7. A drill bit 9 is provided at the bottom of the conical support gyro 8. The drill bit 9 extends below the pressure ring 5. The other ends of the cross frames 7 are respectively fixed on the corresponding inner ends of the bottom ring 1. A pneumatic stabilizing device 22 is provided on the top of the conical support gyro 8.

[0051] Wherein, the cross-sectional diameter of the pressure ring 5 is smaller than the cross-sectional diameter of the bottom ring 1. A plurality of grid holes 10 are provided on the outer side of the bottom ring 1. The top surface and the side surface of the grid hole 10 are in communication. At least four convex blocks 12 are provided on the side of the fixed support ring 4. Any adjacent group of the support rods 3 are fixed on the bottom ring 1 in a V-shaped structure. Connection ends 13 are provided on the tops of the support rods 3. Triangular heads 14 are provided on the tops of the connection ends 13. A fixing plate 15 is provided between any adjacent group of triangular heads 14. The fixing plates 15 are respectively fixed at the bottoms of the convex blocks 12.

[0052] In addition, the pneumatic stabilizing device 22 includes a support disk 11. A through hole 23 is provided in the middle of the support disk 11. A pneumatic connecting pipe 24 is inserted through the through hole 23. The top of the pneumatic connecting pipe 24 is connected to a pneumatic bellows air pump 25. The air pump 25 is arranged on the top of the support disk 11. The bottom of the pneumatic connecting pipe 24 is connected to an air bag two 26. The bottom end of the air bag two 26 is connected to an expansion mechanism 27. The expansion mechanism 27 includes a plurality of chutes 28 provided on the circumference of the top of the conical support gyro 8. Sliding plates 29 that cooperate with the chutes 28 are provided in the chutes 28. Drill bits two 30 are provided at the outer ends of the sliding plates 29. Side gear ridges 31 are provided at the centers of the tops of the sliding plates 29. Limit holes 32 are provided at the teeth of the side gear ridges 31 near one end of the air bag two 26. The ends of the side gear ridges 31 near the air bag two 26 are respectively fixed at the corresponding end parts of the bottom end of the air bag two 26. Gears 33 that mesh with the side gear ridges 31 are provided on one side of each side gear ridge 31. A gear shaft 34 is inserted through the middle of each gear 33. The tops of the gear shafts 34 are respectively fixed at the corresponding end parts of the bottom of the support disk 11. A limit rod 35 that cooperates with the limit hole 32 is provided at one outer end of each gear 33.

[0053] Secondly, an outer frame 16 is provided at the outer edge of the fixed support ring 4. An inner frame 17 is provided inside the outer frame 16. The inner frame 17 is fixed on the inner wall of the outer side of the fixed support ring 4. An air bag one 18 is provided between the inner frame 17 and the outer frame 16. One end of the air bag one 18 near the inner frame 17 is connected to a high-pressure gas cylinder 20. The high-pressure gas cylinder 20 is installed at one inner end of the inner frame 17. An automatic inflation valve 21 is provided between the high-pressure gas cylinder 20 and the air bag one 18. The inner frame 17 is made of a hard material, and the outer frame 16 is made of a soft material. A plurality of insertion rods 19 are provided on the outer side of the outer frame 16.

[0054] A construction method for a foundation pit support structure includes the following steps:

[0055] S101: Insert the drill bit one 9 into the soil at the bottom of the foundation pit;

[0056] S103: At the same time, bring the pressing ring 5 into the soil layer to prompt the bottom ring 1 to support the inner bottom surface of the foundation pit;

[0057] S105: The lower part of the conical support gyro 8 is immersed into the bottom of the foundation pit under the action of the drill bit one 9;

[0058] S107: The support rods 3 on the top of the bottom ring 1 support the foundation pit wall;

[0059] S109: The support disk 11 is located inside the support rod 3 and is stuck at the lower position between the support rods 3;

[0060] S1011: Pour the liquid substance at the airbag 18 arranged between the outer frame 16 and the inner frame 17, so that when the airbag 18 contacts the liquid substance, the automatic inflation valve 21 is automatically activated, and the high-pressure gas cylinder 20 automatically inflates the airbag 18;

[0061] S1013: The inflated airbag 18 undergoes a strong expansion movement and presses against the outer outer frame 16;

[0062] S1015: Under the strong pushing action, the outer frame 16 is pushed outwards, and during the pushing-out process, the insertion rod 19 on the side is inserted into the foundation pit wall;

[0063] S1017: The fixed support ring 4 is fixed and clamped at the upper part inside the foundation pit through the action of the insertion rod 19;

[0064] S1019: When the upper liquid substance is injected or external materials are dropped, the air pump 25 on the top of the pressing support plate 11 is pressed. Under the action of pressure or gravity, the air pump 25 inflates the inside of the airbag 26 through the pneumatic connection pipe 24;

[0065] S1021: After the airbag 26 is inflated, it expands, and the side gear convex strip 31 connected to the bottom is pushed outwards as it expands;

[0066] S1023: The side gear convex strip 31 drives the bottom slide plate 29 to slide outwards in the chute 28, and finally inserts the drill bit 2 into the foundation pit wall through between the support rods 3;

[0067] S1025: Support and enclose the foundation pit wall.

[0068] The detailed usage method and function of this embodiment:

[0069] Insert the first drill bit 9 into the foundation pit, bury the pressure ring 5 in the soil, so that the bottom ring 1 supports on the bottom surface inside the foundation pit, prompting the side support rods 3 to hoop the foundation pit wall, and the support plate 11 just gets stuck in the middle of the support rods 3. At this time, the lower part of the conical support gyro 8 is firmly fixed inside the foundation pit to maintain balance. Then pour liquid into the airbag 18 arranged between the outer frame 16 and the inner frame 17, so that the airbag 18 automatically activates the automatic inflation valve 21 after contacting the liquid. After the automatic inflation valve 21 is opened, the small high-pressure gas cylinder 20 will automatically inflate the airbag 18. After the airbag 18 is inflated inside, there is a strong sense of expansion. The inflated airbag 18 pushes against the outer frame 16, allowing the insertion rod 19 on the side of the outer frame 16 to be inserted into the upper inner wall of the foundation pit. At the same time, under the injection of the upper liquid or the dropping of external materials, the air pump 25 on the top of the support plate 11 is pressed. The air pump 25 can be set as a rubber corrugated pipe structure and fixed to the top surface of the support plate 11. When the air pump 25 is under pressure or gravity, the air pump 25 inflates the inside of the airbag 26 through the pneumatic connecting pipe 24, causing the airbag 26 to expand after inflation. The side gear protrusion 31 connected to the bottom after expansion is pushed outwards, and the side gear protrusion 31 drives the bottom slide plate 29 to slide outwards in the chute 28, and finally inserts the second drill bit 30 through between the support rods 3 into the lower inner wall of the foundation pit, so that both the upper and lower parts of the foundation pit are supported. In addition, in addition to being able to generate air pressure by the flowing-down liquid or other materials to press the air pump 25 and inflate the airbag 26 with the air pressure, a micro motor with the same number as the gear 33 can be set at one end of the bottom of the support plate 11, and each micro motor is separately connected to the corresponding gear 33, so that each gear 33 can rotate independently. At the same time, a storage battery 36 can be set at the top center position of the conical support gyro 8 between the corresponding ends in the middle of the chute 28. An outer shell 37 can be set on the outside of the storage battery 36, and the storage battery 36 is connected to the micro motor through a wire. The airbag 26 is located above the outer shell 37.In addition, air cylinders 38 are provided at the top bumps 12 of the fixed support ring 4. Air rods 39 that are matched with each other are inserted in the air cylinders 38. The air rods 39 can extend out of the foundation pit. A solar photovoltaic panel mounting plate 40 with a through-hole structure in the middle is arranged between the air rods 39. The solar photovoltaic panel mounting plate 40 has the same size as the fixed support ring 4. Then, a solar photovoltaic panel 41 is installed on the top of the solar photovoltaic panel mounting plate 40. A transparent cover is provided between the solar photovoltaic panel 41 and the side of the solar photovoltaic panel mounting plate 40. Among them, an LED light strip 42 is installed in the transparent cover, that is, in the solar photovoltaic panel mounting plate 40. The solar photovoltaic panel 41 is connected to the storage battery 36, and the storage battery 36 is connected to the LED light strip 42. After the support device is supported in the foundation pit wall, the air cylinder 38 can be prompted to drive the air rod 39 to perform telescopic movement, so that the air rod 39 pushes the solar photovoltaic panel mounting plate 40 to extend out of the foundation pit wall and be exposed outside. At this time, after the solar photovoltaic panel 41 receives solar energy, the energy is converted and stored in the storage battery 36. The electric energy stored in the storage battery 36 can be used for the micro motor or for supplying power to the LED light strip 42. When the external light is relatively dim, the LED light strip 42 can play a prompting role, increasing the safety of the construction site.

[0070] In addition, under the pushing action of the side gear convex strip 31, the meshing gear 33 on the side will also be driven to rotate. After the gear 33 rotates one circle, the limiting rod 35 at the end of the side just rotates to be inserted into the limiting hole 32 on the side of the side gear convex strip 31 to limit the side gear convex strip 31, thereby increasing the stability of the lower part in the foundation pit.

[0071] Through the above specific embodiments, those skilled in the technical field can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific embodiments. Based on the disclosed embodiments, those skilled in the technical field can arbitrarily combine different technical features to implement different technical solutions.

Claims

1. A foundation pit support structure, characterized in that, It includes a bottom ring (1). Several backing plates (2) are provided at the top of the bottom ring (1). Support rods (3) are provided at the tops of the backing plates (2). A fixed support ring (4) is provided between the tops of the support rods (3). A pressure ring (5) is provided below the bottom ring (1). Several support rods (6) are provided at the top of the pressure ring (5). Cross frames (7) are provided at the tops of the support rods (6). A conical support gyro (8) is provided between one ends of the cross frames (7). A drill bit one (9) is provided at the bottom of the conical support gyro (8). The drill bit one (9) extends below the pressure ring (5). The other ends of the cross frames (7) are respectively fixed on the corresponding inner ends of the bottom ring (1). An air-powered stabilizing device (22) is provided at the top of the conical support gyro (8). The air-powered stabilizing device (22) includes a support disk (11). A through hole (23) is provided in the middle of the support disk (11). An air-powered connecting pipe (24) is inserted in the through hole (23). The top of the air-powered connecting pipe (24) is connected to an air-powered bellows type air pump (25). The air pump (25) is provided on the top of the support disk (11). The bottom of the air-powered connecting pipe (24) is connected to an air bag two (26). The bottom end of the air bag two (26) is connected to an expansion mechanism (27). The expansion mechanism (27) includes several sliding grooves (28) provided on the circumference of the top of the conical support gyro (8). Sliding plates (29) that match the sliding grooves (28) are provided in the sliding grooves (28). Drill bits two (30) are provided at the outer ends of the sliding plates (29). Side gear ridges (31) are provided at the centers of the tops of the sliding plates (29). Limit holes (32) are provided at the teeth of the side gear ridges (31) near one end of the air bag two (26). The ends of the side gear ridges (31) near the air bag two (26) are respectively fixed at the corresponding ends of the bottom end of the air bag two (26). Gears (33) that mesh with the side gear ridges (31) are provided on one side of each side gear ridge (31). Gear shafts (34) are inserted through the middles of the gears (33). The tops of the gear shafts (34) are respectively fixed at the corresponding ends of the bottom of the support disk (11). Limit rods (35) that match the limit holes (32) are provided at the outer ends of the gears (33).

2. The foundation pit support structure according to claim 1, characterized in that, The cross-sectional diameter of the pressure ring (5) is smaller than that of the bottom ring (1). Several grid holes (10) are provided on the outer side of the bottom ring (1). The top surface and the side surface of the grid holes (10) are in communication with each other.

3. The foundation pit support structure according to claim 2, characterized in that, At least four bumps (12) are provided on the side of the fixed support ring (4). Any adjacent group of support rods (3) are fixed on the bottom ring (1) in a V-shaped structure. Connection ends (13) are provided at the tops of the support rods (3). Triangular heads (14) are provided at the tops of the connection ends (13). Fixing plates (15) are provided between any adjacent group of triangular heads (14). The fixing plates (15) are respectively fixed at the bottoms of the bumps (12).

4. The foundation pit support structure according to claim 3, characterized in that, An outer frame (16) is provided at the outer edge of the fixed support ring (4). An inner frame (17) is provided inside the outer frame (16). The inner frame (17) is fixed on the outer inner wall of the fixed support ring (4). An airbag one (18) is provided between the inner frame (17) and the outer frame (16). One end of the airbag one (18) close to the inner frame (17) is connected to a high-pressure gas cylinder (20). The high-pressure gas cylinder (20) is installed at one end inside the inner frame (17). An automatic inflation valve (21) is provided between the high-pressure gas cylinder (20) and the airbag one (18).

5. The foundation pit support structure according to claim 4, characterized in that, The inner frame (17) is made of a hard material, and the outer frame (16) is made of a soft material. A number of insertion rods (19) are provided on the outer side of the outer frame (16).

6. A construction method of a foundation pit support structure, characterized in that, The construction method of the foundation pit support structure for claim 5 includes the following steps: Insert the first drill bit (9) into the soil at the bottom of the foundation pit; At the same time, bring the pressure ring (5) into the soil layer to prompt the bottom ring (1) to support the inner bottom surface of the foundation pit; The lower part of the conical support gyro (8) is immersed in the bottom of the foundation pit under the action of the first drill bit (9); The support rod (3) at the top of the bottom ring (1) supports the foundation pit wall; The support disc (11) is located inside the support rod (3) and is stuck at the lower position between the support rods (3); Pour a liquid substance at the airbag one (18) provided between the outer frame (16) and the inner frame (17), so that the airbag one (18) contacts the liquid substance and automatically activates the automatic inflation valve (21), and the high-pressure gas cylinder (20) automatically inflates the airbag one (18); The inflated airbag one (18) undergoes a strong expansion movement and presses against the outer outer frame (16); The outer frame (16) is pushed outwards under a strong pushing action, and the insertion rods (19) on the side are inserted into the foundation pit wall during the pushing-out process; The fixed support ring (4) is fixed and stuck at the upper part inside the foundation pit through the action of the insertion rods (19); Under the injection of the upper liquid substance or the dropping of external materials, the air pump (25) on the top of the support disc (11) is pressed. Under the action of pressure or gravity, the air pump (25) inflates the inside of the airbag two (26) through the pneumatic connection pipe (24); After the airbag two (26) is inflated, it expands, and the side gear convex strip (31) connected to the bottom is pushed outwards as it expands; The side gear convex strip (31) drives the bottom slide plate (29) to slide outwards in the chute (28), and finally inserts the second drill bit (30) through between the support rods (3) into the foundation pit wall; the foundation pit wall is supported and enclosed.

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