Deep foundation pit inner supporting device based on permanent and temporary combination

Abstract

The invention provides a deep foundation pit inner supporting device based on permanent and temporary combination, and belongs to the technical field of deep foundation pit inner supporting, the deep foundation pit inner supporting device comprises a supporting component, the supporting component comprises two sets of cast-in-place piles and a supporting column arranged between the two sets of cast-in-place piles, and the interior of the supporting column is connected with an adjusting column in a left-right sliding mode; concrete fences are arranged on the inner sides of the two sets of cast-in-place piles, cast-in-place beams are fixedly connected to the tops of the concrete fences and the cast-in-place piles, mounting plates are arranged on the inner sides of the two concrete fences through bolts, and distance adjusting assemblies for driving the supporting columns and the adjusting columns to be adjusted front and back are arranged in the mounting plates. By flexibly adjusting the distance between the supporting columns and the adjusting columns, the gap can be expanded during material transportation so as to facilitate rapid passage (such as component hoisting or soil outward transportation), the initial state is recovered during supporting, the supporting force is enhanced, the problem of contradiction between transportation difficulty and supporting stability caused by fixed gap of a traditional supporting structure is solved, and the operation efficiency and the foundation pit safety are both considered; and personnel operation risks are reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of deep foundation pit internal support, specifically relating to a deep foundation pit internal support device based on a combination of permanent and temporary supports. Background Technology

[0002] Foundation pit engineering is the preferred spatial construction method for various underground buildings with large burial depths, large spaces, and irregular structures. Conventional foundation pit support structures often adopt a combination of permanent and temporary methods, in which the capping beam and fence inside the foundation pit are both part of the main structure, thus eliminating the need for demolition. This allows the enclosure, capping beam, and main structure to be shared, reducing waste and saving costs.

[0003] Existing permanent and temporary combined supports mostly adopt a single-line bracing method, which involves placing multiple steel pipes horizontally inside the deep pit and connecting them to the fence using I-beams to support the pit and prevent it from collapsing inward. As the pit is excavated downward, multiple steel pipes need to be placed horizontally at intervals for reinforcement. The steel pipes are quite heavy, so their positions are fixed after installation, and the gap between two steel pipes is constant. The smaller the gap between the two steel pipes, the stronger the support effect. However, when the gap between the two steel pipes is small, it is inconvenient to transport steel pipes downward and soil upward through the gap. On the other hand, widening the gap between the two steel pipes will weaken the support effect. Furthermore, the steel pipes are large in volume, and the space for movement inside the pit is limited. The steel pipes and I-beams are often installed with multiple bolts, which is cumbersome and time-consuming during installation, making it quite inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide a deep foundation pit support device based on a combination of permanent and temporary structures, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A deep foundation pit support device based on a combination of permanent and temporary structures includes a support component comprising two sets of cast-in-place piles and a support column positioned between the two sets of piles. An adjusting column is slidably connected to the inside of the support column. Concrete enclosures are provided on the inner sides of both sets of piles. A grouting beam is fixedly connected to the top of each concrete enclosure. Mounting plates are bolted to the inner sides of both concrete enclosures. An adjusting assembly is provided inside the mounting plate to drive the support column and adjusting column to adjust forward and backward. A support assembly adapted to the support column is provided outside the adjusting column. An auxiliary component includes an abutment plate fixedly connected to the support column and adjusting column near the mounting plate. A lifting ring is fixedly connected to the top of the abutment plate.

[0006] In a preferred embodiment of the present invention, the adjusting assembly includes a slider that is slidably connected to the inside of a mounting plate. An adjusting rod is threadedly connected to the inside of the slider. An adjusting groove is provided at the corresponding position of the mounting plate and the adjusting rod. A pressure block is fixedly connected to the outside of the adjusting rod. A first anti-slip pad is fixedly connected to the bottom of the pressure block. A lifting plate is slidably connected to the inside of the slider. A pressure rod is fixedly connected to the bottom of the lifting plate. A second anti-slip pad is fixedly connected to the end of the pressure rod away from the lifting plate. A first tension spring is provided between the top of the lifting plate and the slider.

[0007] In a preferred embodiment of the present invention, the two ends of the first tension spring are respectively fixed to the slider and the lifting plate, the bottom of the second anti-slip pad abuts against the inside of the mounting plate, and the bottom of the first anti-slip pad abuts against the top of the mounting plate.

[0008] In a preferred embodiment of the present invention, the bottom end of the adjusting rod abuts against the top of the lifting plate.

[0009] In a preferred embodiment of the present invention, the diameter of the adjusting groove is slightly larger than the diameter of the adjusting rod.

[0010] As a preferred embodiment of the present invention, the support assembly includes a threaded sleeve threaded to the outside of the adjusting column, a rotating handle fixedly connected to the outside of the threaded sleeve, an anti-detachment ring slidably connected to the inside of the threaded sleeve, a rubber buffer pad fixedly connected to the right side of the anti-detachment ring, a second tension spring provided between the left side of the anti-detachment ring and the threaded sleeve, and a bellows rotatably connected to the inside of the threaded sleeve.

[0011] In a preferred embodiment of the present invention, the diameter of the bellows is larger than the diameter of the adjusting column, and the two ends of the second tension spring are respectively fixed to the anti-detachment ring and the threaded sleeve.

[0012] In a preferred embodiment of the present invention, the right side of the rubber buffer pad abuts against the left end of the support column.

[0013] In a preferred embodiment of the present invention, the side of the abutment plate closest to the mounting plate is fixedly connected to a mounting block, the side of the slider away from the concrete fence is fixedly connected to a mounting block, and the mounting block has two limiting blocks that slide back and forth inside.

[0014] In a preferred embodiment of the present invention, the mounting block is inserted into the interior of the mounting block, both limiting blocks abut against the top of the mounting block, and the end of the bellows away from the threaded sleeve abuts against the outside of the abutment plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: By setting up adjustable spacing components, the distance between the support columns and the adjusting columns can be flexibly adjusted. When transporting materials, the gap can be widened to facilitate rapid passage (such as hoisting components or transporting soil). When supporting, the initial state is restored to enhance the supporting force. This solves the problem of transportation difficulties and the contradiction between support stability caused by the fixed gap of traditional support structures. It takes into account both operational efficiency and foundation pit safety, and reduces the risk of personnel operation.

[0016] By using a set of support components, employing a threaded sleeve and anti-loosening ring structure, along with a rubber buffer pad and a second tension spring, the minimum length of the support column and adjustment column can be fixed to prevent retraction, while also absorbing the impact force of slight tilting of the concrete fence with small-range deformation, dynamically maintaining the stability of the support; the corrugated pipe protective threads prevent rust and blockage, extend the service life of components, and ensure long-term support reliability.

[0017] With the help of auxiliary components, quick assembly is achieved through the abutment plate, lifting ring and installation block. After being lifted and positioned by a winch or other equipment, the connection can be made by simply inserting the installation block and pushing the limit block. No bolts or other complicated tools are required, which simplifies the installation process and improves construction efficiency. At the same time, the abutment plate ensures the verticality of the support structure and enhances the overall support effect of the concrete fence. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a top view of the structure of the present invention; Figure 2 This is a frontal cross-sectional view of the present invention. Figure 3 This is a schematic diagram of the external structure of the cast-in-place pile of the present invention; Figure 4 This is an exploded view of the external structure of the mounting plate of the present invention; Figure 5 This is a schematic diagram of the external cross-sectional structure of the slider of the present invention; Figure 6 This is a front view cross-sectional structural diagram of the slider of the present invention; Figure 7 This is a schematic diagram of the external cross-sectional structure of the rotating handle of the present invention; Figure 8 This is a schematic diagram of the external cross-sectional structure of the support column of the present invention.

[0019] In the diagram: 10. Cast-in-place pile; 11. Support column; 12. Adjusting column; 13. Concrete fence; 14. Cast-in-place beam; 15. Mounting plate; 16. Adjustment assembly; 161. Sliding block; 162. Adjusting rod; 163. Adjusting groove; 164. Pressure block; 165. First anti-slip pad; 166. Lifting plate; 167. Pressure rod; 168. Second anti-slip pad; 169. First tension spring; 17. Support assembly; 171. Threaded sleeve; 172. Rotating handle; 173. Anti-detachment ring; 174. Rubber buffer pad; 175. Second tension spring; 176. Corrugated pipe; 20. Abutment plate; 21. Lifting ring; 22. Mounting insert; 23. Mounting block; 24. Limiting block. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Example 1:

[0021] Reference Figures 1-7 This is the first embodiment of the present invention. This embodiment provides a deep foundation pit support device based on a combination of permanent and temporary structures. It includes a support component, including two sets of cast-in-place piles 10 and a support column 11 located between the two sets of cast-in-place piles 10. An adjusting column 12 is slidably connected to the inside of the support column 11. A concrete fence 13 is provided on the inner side of each of the two sets of cast-in-place piles 10. A grouting beam 14 is fixedly connected to the top of the concrete fence 13 and the top of the cast-in-place pile 10. An installation plate 15 is provided on the inner side of each of the two concrete fences 13 by bolts. An adjustment component 16 is provided inside the installation plate 15 to drive the support column 11 and the adjusting column 12 to adjust back and forth. A support component 17 adapted to the support column 11 is provided on the outside of the adjusting column 12.

[0022] The process involves marking lines on the ground according to the size of the excavation pit, drilling holes at equal intervals, placing a ring-shaped steel reinforcement frame inside the holes, and injecting concrete. After solidification, this forms cast-in-place piles 10. Two sets of cast-in-place piles 10 are arranged side by side. A layer of steel mesh is then installed on the inner side of the two sets of cast-in-place piles 10, flush with the soil surface. Concrete is then sprayed outside the steel mesh, forming a concrete enclosure 13 after solidification. A grouting beam 14 is then installed on top of the cast-in-place piles 10 and the concrete enclosure 13. The grouting beam 14 serves to prevent pit collapse and also allows individual cast-in-place piles 10 to be connected to adjusting columns 1. The two columns are connected as a whole to increase the integrity and reduce cracks. The gap between the two support columns 11 can be adjusted by moving the support column 11 and the adjusting column 12 through the adjusting component 16. When transporting materials, the gap between the two support columns 11 can be increased to facilitate transportation. When supporting the foundation pit, it can be adjusted to the initial state to strengthen the support force and prevent the pit surface from tilting. The length formed by the support column 11 and the adjusting column 12 can be adjusted according to the size of the pit opening through the support component 17, thereby achieving the effect of adjustable support and making it more applicable.

[0023] Furthermore, the adjustable distance assembly 16 includes a slider 161 that is slidably connected to the inside of the mounting plate 15. An adjusting rod 162 is threadedly connected to the inside of the slider 161. An adjusting groove 163 is provided at the corresponding position of the mounting plate 15 and the adjusting rod 162. A pressure block 164 is fixedly connected to the outside of the adjusting rod 162. A first anti-slip pad 165 is fixedly connected to the bottom of the pressure block 164. A lifting plate 166 is slidably connected to the inside of the slider 161. A pressure rod 167 is fixedly connected to the bottom of the lifting plate 166. A second anti-slip pad 168 is fixedly connected to the end of the pressure rod 167 away from the lifting plate 166. A first tension spring 169 is provided between the top of the lifting plate 166 and the slider 161.

[0024] In this configuration, the first tension spring 169 causes the second anti-slip pad 168 to initially retract inside the slider 161, and the pressure block 164 to initially move away from the adjusting rod 162, so that the first anti-slip pad 165 does not come into contact with the top of the slider 161. This makes the slider 161 move back and forth more smoothly and with less effort when it moves inside the adjusting assembly 16.

[0025] Preferably, the two ends of the first tension spring 169 are fixed to the slider 161 and the lifting plate 166 respectively, the bottom of the second anti-slip pad 168 abuts against the inside of the mounting plate 15, the bottom of the first anti-slip pad 165 abuts against the top of the mounting plate 15, the bottom of the adjusting rod 162 abuts against the top of the lifting plate 166, and the diameter of the adjusting groove 163 is slightly larger than the diameter of the adjusting rod 162.

[0026] The diameter of the adjusting groove 163 is slightly larger than that of the adjusting rod 162, so that when the first anti-slip pad 165 is not in contact with the slider 161, the slider 161 can slide freely inside the mounting plate 15 when the support column 11 is pushed to move. This allows the gap between the two support columns 11 to be adjusted according to the actual use, making it more flexible in use. The lifting plate 166 abuts against the bottom of the adjusting rod 162 under the action of the first tension spring 169, so that the rotation of the adjusting rod 162 can drive the lifting plate 166 to rise and fall, thereby achieving dual positioning and anti-slip of the first anti-slip pad 165 and the second anti-slip pad 168. This makes the slider 161 more stable after the support column 11 and the adjusting column 12 are adjusted.

[0027] Specifically, the support assembly 17 includes a threaded sleeve 171 threaded to the outside of the adjusting column 12. A rotating handle 172 is fixedly connected to the outside of the threaded sleeve 171. An anti-detachment ring 173 is slidably connected to the inside of the threaded sleeve 171. A rubber buffer pad 174 is fixedly connected to the right side of the anti-detachment ring 173. A second tension spring 175 is provided between the left side of the anti-detachment ring 173 and the threaded sleeve 171. A bellows 176 is rotatably connected to the inside of the threaded sleeve 171. The diameter of the bellows 176 is larger than the diameter of the adjusting column 12. The two ends of the second tension spring 175 are fixed to the anti-detachment ring 173 and the threaded sleeve 171, respectively. The right side of the rubber buffer pad 174 abuts against the left end of the support column 11.

[0028] It should be noted that the rubber buffer pad 174 is located between the support column 11 and the anti-detachment ring 173. When the concrete fence 13 tilts slightly and the distance between the two concrete fences 13 changes slightly, the rubber buffer pad 174 and the second tension spring 175 can deform slightly to reduce and absorb the slight tilting pressure, thereby protecting the anti-detachment ring 173. This ensures that the length formed by the support column 11 and the adjusting column 12 remains unchanged, thus continuously supporting the concrete fence 13 and maintaining the foundation pit. Since the corrugated pipe 176 is far from the threaded section... One end of the sleeve 171 abuts against the outside of the mounting block 23, and the bellows 176 does not contact the outside of the adjusting column 12. This allows the bellows 176 to protect the threads on the outside of the adjusting column 12 without affecting the extension and retraction of the adjusting column 12 inside the support column 11. This prevents soil from falling and adhering to the outside of the threads during soil transportation, thus preventing rust from forming on the threads. Furthermore, all threads in this application are coated with an anti-rust coating, which further prevents the bellows 176 from rusting and also prevents soil from clogging the threads and causing the threaded sleeve 171 to be difficult to move.

[0029] In use, after installing the cast-in-place piles 10, concrete fence 13, and grouting beam 14 inside the foundation pit, the mounting plate 15 is installed on the concrete fence 13 at a suitable height using bolts. Initially, the five sliders 161 inside the mounting plate 15 are evenly distributed and in optimal support condition. The first anti-slip pad 165 and the second anti-slip pad 168 in the adjusting assembly 16 are both abutting against the mounting plate 15, ensuring that the five sliders 161 are evenly distributed inside the mounting plate 15 and their positions are fixed, preventing movement. On the ground outside the foundation pit, the support column 11 is placed on the ground, and the adjusting column 12 is pulled inside the support column 11 to adjust the length formed by the support column 11 and the adjusting column 12. Once the length matches the length of the foundation pit... Rotating the handle 172 causes the threaded sleeve 171 to be threaded onto the outside of the adjusting column 12, thereby causing the threaded sleeve 171 to move the anti-detachment ring 173. This causes the right side of the rubber buffer pad 174 to abut against the left end of the support column 11, thus fixing the shortest possible length between the support column 11 and the adjusting column 12, ensuring that the adjusting column 12 can only extend and not shorten. After the two mounting plates 15 are installed on the outside of the left and right concrete fences 13 respectively, the adjusted support column 11 and adjusting column 12 are hoisted into the pit using the two lifting rings 21 on the top of the two abutment plates 20. Then, under manual pushing and adjustment, the two mounting blocks 22 are aligned with the slots of the two mounting blocks 23, and then pressed down to complete the insertion, thus fully connecting the support column 11 and the adjusting column 12. After installation, since the adjusting column 12 can only extend, when the concrete fence 13 tilts inward, the mounting plate 15 presses against the mounting block 23, causing the abutment plate 20 to move the adjusting column 12 towards the support column 11. The rubber buffer pad 174 abuts against the left end of the abutment plate 20, preventing the adjusting column 12 from moving further into the support column 11, thus supporting the tilted concrete fence 13. Simultaneously, under the action of the second tension spring 175 and the rubber buffer pad 174, the adjusting column 12 can move slightly inside the support column 11, causing the sudden tilting force to press against the second tension spring 175 and the rubber buffer pad 174. The deformation of the second tension spring 175 and the rubber buffer pad 174 absorbs the impact force, thus protecting the anti-detachment ring 173. While providing protection, the concrete fence 13 is continuously supported to maintain the foundation pit. The corrugated pipe 176 is installed between the threaded sleeve 171 and the abutment plate 20 to protect the threads on the outside of the adjusting column 12. When digging deeper into the foundation pit, the soil in the pit needs to be transported out, and the above operations need to be repeated at certain intervals below. The installation plate 15 and its connected components need to be transported into or out of the pit. However, the distance between the two support columns 11 is small, which makes transportation inconvenient. At this time, rotating the adjusting rod 162, which is threadedly connected to the inside of the slider 161, causes the pressure block 164 to rise, causing the first anti-slip pad 165 to no longer abut against the top of the slider 161. At the same time, the first tension spring 169 rebounds, causing the lifting plate 166 and the pressure rod 167 to rise.This retracts the second anti-slip pad 168 into the slider 161, preventing it from contacting the mounting plate 15. This simultaneously releases the first anti-slip pad 165 and the second anti-slip pad 168 from contact with the mounting plate 15. At this point, the position of the slider 161 within the mounting plate 15 can be adjusted arbitrarily. The support column 11 can be pushed to move the slider 161, thus adjusting the gap between the two support columns 11 according to actual conditions. When transporting components into the pit or soil outwards, the increased gap allows for rapid transport, accelerating the construction efficiency. Faster construction reduces the time operators spend in the pit, thus reducing the risk of accidents and enhancing personnel protection. This avoids the problems in existing technologies where a small gap between the two support columns 11 makes material transport difficult, while a large gap results in weak support and higher risks. Example 2:

[0030] Reference Figure 5 , Figure 8 This is the second embodiment of the present invention. Unlike the previous embodiment, this embodiment provides auxiliary components, including an abutment plate 20 fixedly connected to the support column 11 and the adjusting column 12 near the end of the mounting plate 15. A lifting ring 21 is fixedly connected to the top of the abutment plate 20. An installation block 22 is fixedly connected to the side of the abutment plate 20 near the mounting plate 15. An installation block 23 is fixedly connected to the side of the slider 161 away from the concrete fence 13. Two limiting blocks 24 are slidably connected to the inside of the installation block 23. The installation block 22 is inserted into the inside of the installation block 23. Both limiting blocks 24 abut against the top of the installation block 22. The end of the corrugated pipe 176 away from the threaded sleeve 171 abuts against the outside of the abutment plate 20.

[0031] Specifically, due to its inherent characteristics, the end of the corrugated pipe 176 furthest from the threaded sleeve 171 abuts against the outside of the abutment plate 20, and the corrugated pipe 176 rotates inside the threaded sleeve 171, further reducing the rotational deformation of the corrugated pipe 176. This allows the corrugated pipe 176 to continuously protect the external threads of the adjusting column 12. The two abutment plates 20 are in close contact with the two mounting blocks 23, so that the support column 11 and the adjusting column 12 are placed perpendicular to the concrete fence 13, thereby providing good support for the two concrete fences 13 and strengthening the support effect inside the foundation pit.

[0032] In use, the support column 11 and adjusting column 12 are lifted and positioned by a winch or other equipment connected to the two lifting rings 21. This allows the support column 11 and adjusting column 12 to be quickly moved to the designated position within the pit. With slight adjustments by personnel, the two mounting blocks 22 are then inserted into the two mounting blocks 23, enabling rapid installation of the two adjusting columns 12 and support column 11 without the need for bolts or other additional tools. The two limiting blocks 24 are then pushed inwards, pressing them against the top of the mounting blocks 22, thus enhancing the positioning effect of the mounting blocks 22. Simultaneously, the weight of the support column 11 and adjusting column 12 fixes the position of the mounting blocks 22 within the mounting blocks 23, ensuring the support column 11 and adjusting column 12 are stable after installation, providing stable support within the pit.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A deep foundation pit internal support device based on a combination of permanent and temporary supports, characterized in that: include, The supporting components include two sets of cast-in-place piles (10) and a supporting column (11) located between the two sets of cast-in-place piles (10). An adjusting column (12) is slidably connected to the inside of the supporting column (11) from left to right. A concrete fence (13) is provided on the inner side of each of the two sets of cast-in-place piles (10). A grouting beam (14) is fixedly connected to the top of the concrete fence (13) and the top of the cast-in-place pile (10). An installation plate (15) is provided on the inner side of each of the two concrete fences (13) by bolts. An adjusting component (16) is provided inside the installation plate (15) to drive the supporting column (11) and the adjusting column (12) to adjust back and forth. A supporting component (17) adapted to the supporting column (11) is provided on the outside of the adjusting column (12). The auxiliary component includes an abutment plate (20) fixedly connected to the support column (11) and the adjustment column (12) at one end near the mounting plate (15), and a lifting ring (21) is fixedly connected to the top of the abutment plate (20).

2. The deep foundation pit support device based on a combination of permanent and temporary structures according to claim 1, characterized in that: The adjustable distance assembly (16) includes a slider (161) that is slidably connected to the inside of the mounting plate (15). An adjusting rod (162) is threadedly connected to the inside of the slider (161). An adjusting groove (163) is provided at the corresponding position of the mounting plate (15) and the adjusting rod (162). A pressure block (164) is fixedly connected to the outside of the adjusting rod (162). A first anti-slip pad (165) is fixedly connected to the bottom of the pressure block (164). A lifting plate (166) is slidably connected to the inside of the slider (161). A pressure rod (167) is fixedly connected to the bottom of the lifting plate (166). A second anti-slip pad (168) is fixedly connected to the end of the pressure rod (167) away from the lifting plate (166). A first tension spring (169) is provided between the top of the lifting plate (166) and the slider (161).

3. A deep foundation pit internal support device based on a combination of permanent and temporary structures as described in claim 2, characterized in that: The two ends of the first tension spring (169) are fixed to the slider (161) and the lifting plate (166) respectively. The bottom of the second anti-slip pad (168) abuts against the inside of the mounting plate (15), and the bottom of the first anti-slip pad (165) abuts against the top of the mounting plate (15).

4. A deep foundation pit support device based on a combination of permanent and temporary structures as described in claim 3, characterized in that: The bottom end of the adjusting rod (162) abuts against the top of the lifting plate (166).

5. A deep foundation pit support device based on a combination of permanent and temporary structures as described in claim 4, characterized in that: The diameter of the adjusting groove (163) is slightly larger than the diameter of the adjusting rod (162).

6. A deep foundation pit support device based on a combination of permanent and temporary structures as described in claim 5, characterized in that: The support assembly (17) includes a threaded sleeve (171) threaded to the outside of the adjusting column (12). A rotating handle (172) is fixedly connected to the outside of the threaded sleeve (171). An anti-detachment ring (173) is slidably connected to the inside of the threaded sleeve (171). A rubber buffer pad (174) is fixedly connected to the right side of the anti-detachment ring (173). A second tension spring (175) is provided between the left side of the anti-detachment ring (173) and the threaded sleeve (171). A bellows (176) is rotatably connected to the inside of the threaded sleeve (171).

7. A deep foundation pit support device based on a combination of permanent and temporary structures as described in claim 6, characterized in that: The diameter of the bellows (176) is larger than the diameter of the adjusting column (12), and the two ends of the second tension spring (175) are fixed to the anti-detachment ring (173) and the threaded sleeve (171) respectively.

8. A deep foundation pit support device based on a combination of permanent and temporary structures as described in claim 7, characterized in that: The right side of the rubber buffer pad (174) abuts against the left end of the support column (11).

9. A deep foundation pit support device based on a combination of permanent and temporary structures according to claim 2, characterized in that: The abutment plate (20) is fixedly connected to the mounting plate (15) with a mounting block (22) on the side close to the mounting plate (15), and the slider (161) is fixedly connected to the mounting block (23) on the side away from the concrete fence (13). The mounting block (23) has two limiting blocks (24) that slide back and forth inside.

10. A deep foundation pit support device based on a combination of permanent and temporary structures as described in claim 9, characterized in that: The mounting block (22) is inserted into the interior of the mounting block (23), and the two limiting blocks (24) abut against the top of the mounting block (22). The end of the corrugated pipe (176) away from the threaded sleeve (171) abuts against the outside of the abutment plate (20).

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