Deep foundation pit supporting structure adjacent to existing building and construction method thereof

Abstract

The application provides a deep foundation pit supporting structure adjacent to an existing building and a construction method thereof, and relates to the technical field of building foundation pit supporting, and comprises a steel guard plate installed in a foundation pit, a plurality of inner support bodies installed between the steel guard plates, and expansion mechanisms arranged at both ends of the inner support bodies. The end of each expansion mechanism is fixed with an adjusting support mechanism, and the adjusting support mechanism is abutted against the steel guard plate. During the operation of the inclined support, the inclination angle of the movable disc can be dynamically adjusted according to the actual working condition requirement. With the increase of the inclination angle, the movable disc will synchronously extrude the corresponding linkage assembly, and then trigger the expansion mechanism to act, so that the expansion assembly is unfolded outward, thereby significantly increasing the contact area with the steel guard plate and effectively improving the supporting rigidity and the bearing capacity of the inclined support system.

Description

Technical Field

[0001] This invention relates to the field of building foundation pit support technology, specifically to deep foundation pit support structures adjacent to existing buildings and their construction methods. Background Technology

[0002] Foundation pit support engineering refers to temporary measures for supporting, reinforcing, protecting, and controlling groundwater in foundation pits to ensure the safety of underground main structure construction and the surrounding environment. It is classified into shallow and deep foundation pit support systems based on excavation depth. This project must comply with the "Safety Management Measures for Sub-projects with High Risk," and projects with an excavation depth exceeding 5 meters (including 5 meters) or involving complex environmental factors are classified as projects exceeding a certain scale of risk. Common support structures include pile support and diaphragm walls, corresponding to different foundation pit safety levels and environmental conditions.

[0003] Patent publication number CN121429006A discloses a deep foundation pit support structure and its construction method adjacent to existing buildings. The deep foundation pit support structure includes the soil between the existing building and the foundation pit, and further includes: two sets of cast-in-place piles: one end adjacent to the foundation pit and the other end adjacent to the existing building; a first mixing pile; a second mixing pile; two capping beams, respectively formed and anchored to the top of the two sets of cast-in-place piles; and multiple connecting beams. This invention offers high support safety and stability: the support structure, composed of cast-in-place piles on both the inner and outer sides, and capping beams and connecting beams on the pile tops, achieves a strengthened support effect, greatly controlling soil deformation during excavation and significantly reducing the risk of building damage during excavation and other construction processes. The first and second mixing piles can form a water-stop curtain, which not only reinforces the soil around the cast-in-place piles but also prevents water seepage into the foundation pit.

[0004] While the aforementioned patents have addressed the issue of poor support effectiveness, the following shortcomings remain: Currently, the internal support structures typically have their ends rigidly connected directly to the steel retaining plate, and their support surfaces are often of fixed dimensions. When the support angle changes significantly due to the shape of the pit or construction requirements, the small contact area leads to a sharp increase in contact stress, easily causing local buckling or crushing of the steel retaining plate or waler, creating safety hazards. Furthermore, in existing systems, there is a lack of effective auxiliary connection structures between upper and lower layers of internal supports, with each layer essentially operating independently. This results in problems such as misalignment of axes and asynchronous stress distribution between upper and lower supports during construction, leading to uneven distribution of support force along the depth of the pit. This makes it difficult to form a synergistic spatial structure, reducing the overall stiffness and stability of the support system and weakening the ability to precisely control pit deformation. Summary of the Invention

[0005] The purpose of this invention is to provide a deep foundation pit support structure and its construction method adjacent to existing buildings. It aims to solve the problems in the prior art where the support angle changes significantly due to the shape of the foundation pit or construction requirements, resulting in a small contact area that leads to increased contact stress and a lack of auxiliary connection structures between the upper and lower internal supports, causing uneven distribution of support force along the depth direction of the foundation pit and making it difficult to form a cohesive overall spatial structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: the deep foundation pit support structure adjacent to existing buildings and its construction method, including steel protective plates installed in the foundation pit and a plurality of inner support bodies installed between the steel protective plates; Both ends of the inner support body are provided with telescopic mechanisms, and each end of the telescopic mechanism is fixed with an adjusting support mechanism, which abuts against the steel protective plate. The adjustment support mechanism includes an angle adjustment component, an extension component, and a linkage component. The angle adjustment component is fixedly connected to the movable end of the telescopic mechanism. The extension component is installed on the side of the angle adjustment component away from the telescopic mechanism. The angle adjustment component and the extension component are connected by a linkage component. The inner support body has grooves on both the upper and lower sides and near the two ends. Each groove is equipped with a folding and flipping mechanism. The folding and flipping mechanisms of the upper and lower layers can be flipped out of the grooves and are relatively fixedly connected. The folding and flipping mechanism includes a position locking component and a linkage folding component, wherein the position locking component is drive-connected to the linkage folding component.

[0007] Preferably, the angle adjustment assembly includes a fixed disk, three sets of adjustment components, and a movable disk; The fixed plate is fixed to the end of the telescopic mechanism, and the three sets of adjusting components are ball-hinged on the fixed plate. The three sets of adjusting components are arranged in a circumferential array at intervals. The end of the movable plate facing the fixed plate is ball-hinged with the three sets of adjusting components. The expansion component is installed on the side of the active disk away from the fixed disk.

[0008] Preferably, each set of adjusting components includes a fixed sleeve, a movable insert rod, and a locking assembly; The fixed sleeve ball is hinged to the fixed plate, the movable insert rod is guided and inserted into the fixed sleeve, and the end of the movable insert rod away from the fixed sleeve is hinged to the movable plate ball; The fixed sleeve and the movable insert are fixedly connected relative to each other by a locking assembly.

[0009] Preferably, the extension assembly includes a rotating disk, a fixed track disk, four moving rods, and four support plates; The rotating disk rotates on the movable disk, the fixed track disk rotates on the rotating disk, and the fixed track disk is fixedly connected to the movable disk through the base. The moving rod slides within the fixed track disk, and one end of the moving rod protruding from the fixed track disk is fixedly connected to the support plate. A guide post is fixed on the moving rod, and an arc-shaped hole is provided on the rotating disk for the guide post to move. The rotating disk is connected to the linkage assembly via a transmission mechanism.

[0010] Preferably, each of the support plates has a storage slot inside, and a connecting mechanism is provided in the storage slot, which can fix adjacent support plates relatively.

[0011] Preferably, the connecting mechanism includes a telescopic plate that slides within the storage slot and a fixing bolt; One end of the telescopic plate is fixed to the inner wall of the storage slot, and the other end of the telescopic plate extends out of the storage slot. The telescopic plate can be fixedly connected to the adjacent support plate by fixing bolts.

[0012] Preferably, the linkage assembly includes a spring rod, a rhomboid block, a rack and pinion, and a transmission component; The spring rods are a plurality of them, arranged in a circumferential array on the fixed disk. The fixed disk has a cavity, and the spring rods are installed in the cavity. The rhombus blocks are a plurality of them, arranged in a circumferential array and guided to slide in the cavity. Each rhombus block abuts against its corresponding spring rod. The rack is guided to slide on the fixed disk through a connecting seat. A frustum is fixed to one end of the rack facing the fixed disk, and the frustum abuts against the plurality of rhombus blocks. The rack is connected to the transmission component, and the transmission component is fixedly connected to the rotating disk.

[0013] Preferably, the transmission component includes a gear, a bevel gear set, and a rotating shaft; The gear, bevel gear set, and rotating shaft are all mounted on the fixed disk via a base. The gear meshes with the rack, and the gear and rotating shaft are connected by a bevel gear set. The rotating shaft is fixedly connected to the rotating disk.

[0014] Preferably, the position locking assembly includes a locking hole and a locking bolt; The locking holes are a plurality of those formed in the grooves, the connecting rod folding assembly is installed in the grooves, and the locking bolts are threadedly connected to the locking holes. The linkage folding assembly includes two sets of linkage components and a flipping frame. Each set of linkage components includes an outer rod and an inner rod. The inner rod and outer rod of both sets rotate between the flipping frame and the inner groove, and the inner rod and outer rod are located on both sides of the flipping frame, with the outer rod located outside the inner rod.

[0015] The construction method for the support structure of a deep foundation pit adjacent to an existing building includes the following steps: S1, Install steel protective plates. Install the steel protective plates inside the foundation pit to form a retaining structure around the foundation pit. S2, Install the inner support body. Install several inner support bodies between the steel guard plates. Apply horizontal support force to the steel guard plates through the inner support bodies to achieve internal support for the steel guard plates. S3, Adjustment telescopic mechanism: Adjust the total length of the inner support body through the telescopic mechanisms at both ends of the inner support body, so that the adjustment support mechanism abuts against the steel guard plate. S4, Angle Adjustment Component: The tilt angle of the movable disc is adjusted by the elongation of three sets of adjustment components. When the elongation of the three sets of adjustment components is the same, the movable disc is parallel to the fixed disc, which is suitable for straight support conditions. When the elongation of the three sets of adjustment components is different, the movable disc tilts, which is suitable for inclined support conditions. The tilt angle is determined by the difference in elongation of the three sets of adjustment components. The greater the difference, the greater the tilt angle. S5, the linkage component triggers the expansion component to expand. When the movable disk tilts, the bottom surface of the movable disk presses against the spring rod at the corresponding position, causing the spring rod to move along the chamber. The compressed spring rod pushes the corresponding rhomboid block to slide radially along the chamber. The inclined surface of the rhomboid block abuts against the conical surface of the truncated cylinder, converting the radial movement of the rhomboid block into the axial movement of the truncated cylinder. The truncated cylinder is fixedly connected to the lower end of the rack. The rack moves upward and meshes with the gear, driving the gear to rotate. The gear transmits power to the rotating shaft through the bevel gear set. The rotating shaft drives the rotating disk to rotate. The arc-shaped hole on the rotating disk drives the guide column to move along the arc trajectory, thereby driving the moving rod and the support plate to extend radially outward along the fixed track disk. The greater the tilt angle of the movable disk, the more spring rods are pressed or the greater the compression, the greater the rise of the truncated cylinder, the longer the rack stroke, the greater the rotation angle of the rotating disk, and the greater the extension of the support plate. S6, the connecting mechanism locks the support plate. When the four support plates are extended into place, the telescopic plate inside each support plate is pulled out during the extension process to fill the gap between adjacent support plates. The telescopic plate is fixedly connected to the adjacent support plate by fixing bolts, so that the four support plates form a complete annular bearing surface. S7, the folding and flipping mechanism connects the upper and lower inner support bodies, flipping the connecting rod folding assembly stored in the groove out of the groove. The two sets of connecting rod components unfold under the drive of the flipping frame. Through the cooperation of the locking bolt and the locking hole, the connecting rod folding assembly is locked in the preset position to ensure that a rigid connection is formed between the upper and lower inner support bodies. After the upper and lower supports are connected by the folding and flipping mechanism, an overall space truss system is formed.

[0016] The beneficial effects are: 1. During the operation of the diagonal bracing, the tilt angle of the movable plate can be dynamically adjusted according to the actual working conditions. As the tilt angle increases, the movable plate will simultaneously squeeze its corresponding linkage component, thereby triggering the extension mechanism to move outward, thus significantly increasing the contact area with the steel guard plate and effectively improving the support stiffness and load-bearing capacity of the diagonal bracing system.

[0017] 2. Once the support plate has been extended, its structure will pull out the telescopic plate in conjunction with it, and achieve relative position locking and rigid connection between adjacent support plates, forming a stable and coordinated support network, thereby comprehensively improving the stability, anti-overturning ability and operational safety of the overall support structure.

[0018] 3. By setting a foldable and flip-up installation connection mechanism between the upper and lower inner support bodies, a rigid connection between the two can be achieved, thereby effectively improving the overall rigidity and support stability of the upper and lower inner support system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the inner support body of the present invention supported between steel guard plates; Figure 2 This is a schematic diagram of the internal support body structure of the present invention; Figure 3 This is a schematic diagram of the angle adjustment component of the present invention installed on the telescopic mechanism; Figure 4 This is a schematic diagram of the structure of the angle adjustment component and the extension component of the present invention working together under the action of the linkage component; Figure 5 In this invention Figure 4 A magnified structural diagram at point A; Figure 6 This is a schematic diagram of the structure of the extended component of the present invention. Figure 7 This is a schematic diagram of the structure of the adjusting component of the present invention; Figure 8 This is a schematic diagram of the telescopic mechanism of the present invention; Figure 9 This is a schematic diagram of the folding and flipping mechanism of the present invention; Figure 10 This is a schematic diagram of the connection mechanism of the present invention.

[0020] In the diagram: 1. Steel guard plate; 2. Inner support body; 301. Position adjustment rod; 5. Extension assembly; 501. Rotating disk; 502. Fixed track disk; 503. Moving rod; 504. Support plate; 6. Linkage assembly; 601. Spring rod; 602. Rhomboid block; 603. Rack; 7. Groove; 8. Position locking assembly; 801. Locking hole; 802. Locking bolt; 9. Outer rod; 10. Fixed disk; 11. Adjustment component; 1101. Fixed sleeve; 1102. Movable insert rod; 12. Movable disk; 13. Guide column; 14. Arc hole; 15. Connecting mechanism; 1501. Telescopic plate; 1502. Fixed bolt; 16. Frustum column; 1601. Gear; 1602. Bevel gear set; 1603. Rotating shaft; 17. Inner rod; 18. Flip frame. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0022] Example 1 The deep foundation pit support structure adjacent to existing buildings includes steel protective plates 1 installed in the foundation pit and several inner support bodies 2 installed between the steel protective plates 1 to provide internal support for the steel protective plates 1. Both ends of the inner support bodies 2 are equipped with telescopic mechanisms, and each telescopic mechanism has an adjustable support mechanism fixed at its end. The adjustable support mechanism abuts against the steel protective plate 1 so that the support angle of the telescopic mechanism can be adjusted by adjusting the support mechanism to achieve straight support and diagonal support. It can be adjusted according to the site conditions, which improves the applicability of the inner support body 2.

[0023] like Figure 1 and Figure 2 As shown, each of the telescopic mechanisms includes a position adjustment rod 301 and a position positioning component. When the position adjustment rod 301 moves along the extension direction of the inner support body 2, it can adjust the extension amount to achieve the purpose of adjusting the support length according to the requirements. The position positioning component can fix the position adjustment rod 301 to the inner support body 2, preventing the position adjustment rod 301 from retracting.

[0024] Specifically, the position adjustment rod 301 is guided and slidably located at both ends of the inner support body 2. The position adjustment rod 301 and the inner support body 2 are relatively fixedly connected by a position positioning component. In this embodiment, the position positioning component includes a through hole, several insertion holes, and an insertion bolt. The through hole is opened on the inner support body 2, and the several insertion holes are opened on the position adjustment rod 301. When the position adjustment rod 301 moves along the extension direction of the inner support body 2, the through hole and the insertion holes are adapted to each other. Then, the insertion bolt passes through the insertion hole and is threadedly connected to the through hole to lock the position of the position adjustment rod 301 and achieve a relatively fixed connection between the position adjustment rod 301 and the inner support body 2.

[0025] like Figures 1-7 As shown, the adjustment support mechanism includes an angle adjustment component, an extension component 5, and a linkage component 6. The angle adjustment component is fixedly connected to the end of the movable section of the telescopic mechanism. The extension component 5 is installed on the side of the angle adjustment component away from the telescopic mechanism. The angle adjustment component and the extension component 5 are connected by a transmission through the linkage component 6, so that when the angle adjustment component increases or decreases the tilt angle, it can drive the extension component 5 to expand or contract through the linkage component 6.

[0026] Specifically, the angle adjustment assembly includes a fixed disk 10, three sets of adjustment components 11, and a movable disk 12. The fixed disk 10 is fixed to the end of the telescopic mechanism. The three sets of adjustment components 11 are ball-hinged to the fixed disk 10 and are arranged in a circumferential array. The end of the movable disk 12 facing the fixed disk 10 is ball-hinged to the three sets of adjustment components 11 so that the elongation of the three sets of adjustment components 11 is different, thereby realizing the angle adjustment of the movable disk 12. The extension component 5 is installed on the side of the movable disk 12 away from the fixed disk 10.

[0027] Each set of adjusting components 11 includes a fixed sleeve 1101, a movable insert rod 1102, and a locking assembly; the fixed sleeve 1101 is ball-hinged to the fixed plate 10, the movable insert rod 1102 is guided and inserted into the fixed sleeve 1101, and the end of the movable insert rod 1102 away from the fixed sleeve 1101 is ball-hinged to the movable plate 12; the fixed sleeve 1101 and the movable insert rod 1102 are relatively fixedly connected by the locking assembly.

[0028] In this embodiment, the locking assembly includes a first locking hole, a second locking hole, and a first bolt. The first locking hole is formed on the fixed sleeve 1101, and there are several second locking holes formed on the movable insert rod 1102. When the movable insert rod 1102 moves along the extension direction of the fixed sleeve 1101, the first locking hole and the second locking hole are adapted to each other, and the first bolt can pass through the second locking hole and be threadedly connected to the first locking hole to realize the length adjustment of the adjusting component 11.

[0029] The extension component 5 includes a rotating disk 501, a fixed track disk 502, four movable rods 503, and four support plates 504. In this embodiment, the fixed track disk 502 includes a mounting plate and four track plates. The four track plates are fixed on the mounting plate, and the track plates are provided with limiting tracks for guiding the movable rods 503 to slide. The support plates 504 have a fan-shaped cross-section. When the four support plates 504 are contracted, they can be combined into a circular structure. When the support plates 504 are expanded, they can form a ring structure, increasing the support area. The rotating disk 501 rotates on the movable disk 12, and the fixed track disk 502 rotates on the rotating disk 12. On the rotating disk 501, the fixed track disk 502 is fixedly connected to the movable disk 12 through the base. The moving rod 503 is guided and slidably inside the fixed track disk 502. One end of the moving rod 503 protrudes from the fixed track disk 502 and is fixedly connected to the support plate 504. A guide post 13 is fixed on the moving rod 503. An arc-shaped hole 14 is opened on the rotating disk 501 to guide the moving of the guide post 13. When the rotating disk 501 rotates, it can drive the guide post 13 to move along the extension direction of the arc-shaped hole 14, thereby causing the moving rod 503 and the support plate 504 to move along the extension direction of the fixed track disk 502, thereby expanding the support plate 504.

[0030] The linkage component 6 includes a spring rod 601, a rhombus block 602, a rack 603, and a transmission component. In this embodiment, the spring rod 601 includes a spring and a round rod. The spring is sleeved on the outside of the round rod, and the other end of the spring is fixedly connected to the fixed disk 10. There are several spring rods 601, which are distributed in a circumferential array on the fixed disk 10. A cavity is opened on the fixed disk 10, and the spring rods 601 are installed in the cavity. There are several rhombus blocks 602, which are guided and slid in a circumferential array in the cavity. Each rhombus block 602 abuts against the corresponding spring rod 601. The rack 603 is guided and slids on the fixed disk 10 through a connecting seat. A frustum column 1 is fixed to one end of the rack 603 facing the fixed disk 10. 6. The frustum column 16 abuts against several rhomboid blocks 602; the rack 603 is connected to the transmission component, which is fixedly connected to the rotating disk 501, causing the movable disk 12 to tilt under the action of the adjusting component 11. After tilting, it presses against the corresponding spring rod 601, and the round rod in the spring rod 601 can move towards the cavity, thereby squeezing the rhomboid blocks 602. Then, the squeezed rhomboid blocks 602 will move along the cavity, and the rhomboid blocks 602 will lift the frustum column 16, so that the rhomboid blocks 602 drive the frustum column 16 and the rack 603 to move. The movement of the rack 603 can drive the rotating disk 501 to rotate through the transmission component, thereby expanding the four support plates 504.

[0031] like Figure 10As shown, each support plate 504 has a storage slot inside, and a connecting mechanism 15 is provided in the storage slot. The connecting mechanism 15 can fix adjacent support plates 504 relatively to form a ring structure, thereby enhancing the support effect.

[0032] Specifically, the connecting mechanism 15 includes a telescopic plate 1501 and a fixing bolt 1502 that slide in the storage slot. One end of the telescopic plate 1501 is fixed to the inner wall of the storage slot, and the other end of the telescopic plate 1501 extends out of the storage slot. The telescopic plate 1501 can be relatively fixedly connected to the adjacent support plate 504 through the fixing bolt 1502. After the four support plates 504 are expanded, the gap between two adjacent support plates 504 can be connected through the telescopic plate 1501, thereby improving the support stability of the support plates 504.

[0033] In this embodiment, the telescopic plate 1501 is assembled together using a sleeve.

[0034] The transmission components include a gear 1601, a bevel gear set 1602, and a rotating shaft 1603. In this embodiment, the bevel gear set 1602 includes a main bevel gear and a secondary bevel gear. The main bevel gear rotates coaxially with the gear 1601, and the secondary bevel gear rotates coaxially with the rotating shaft 1603. The gear 1601, the bevel gear set 1602, and the rotating shaft 1603 are all mounted on the fixed disk 10 via a base. The gear 1601 and the rotating shaft 1603 are connected by the bevel gear set 1602. When the rack 603 moves, the gear 1601 and the rack 603 mesh with each other, so the gear 1601 can be driven to rotate. The rotation of the gear 1601 can drive the rotating shaft 1603 to rotate via the bevel gear set 1602. The rotating shaft 1603 is fixedly connected to the rotating disk 501, so the rotation of the rotating shaft 1603 can drive the rotating disk 501 to rotate, thereby realizing the adjustment of the tilt angle and the extension linkage of the support plate 504.

[0035] The construction method for deep foundation pit support structures adjacent to existing buildings includes the following steps: S1, Install steel guard plate 1. Install steel guard plate 1 inside the foundation pit to form a retaining structure around the foundation pit. S2, Install the inner support body 2, install several inner support bodies 2 between the steel guard plate 1, and apply a horizontal support force to the steel guard plate 1 through the inner support body 2 to achieve the inner support of the steel guard plate 1. S3, Adjust the telescopic mechanism, adjust the total length of the inner support body 2 through the telescopic mechanisms at both ends of the inner support body 2, so that the adjusting support mechanism abuts against the steel guard plate 1. S4, the angle adjustment component adjusts the tilt angle of the movable plate 12 by adjusting the elongation of the three sets of adjustment components 11. When the elongation of the three sets of adjustment components 11 is the same, the movable plate 12 is parallel to the fixed plate 10, which is suitable for the straight support condition. When the elongation of the three sets of adjustment components 11 is different, the movable plate 12 tilts, which is suitable for the inclined support condition. The tilt angle is determined by the difference in the elongation of the three sets of adjustment components 11. The larger the difference, the larger the tilt angle. S5, the linkage component 6 triggers the expansion component 5 to expand. When the movable disk 12 tilts, the bottom surface of the movable disk 12 presses against the corresponding spring rod 601, causing the spring rod 601 to move along the cavity. The compressed spring rod 601 pushes the corresponding rhomboid block 602 to slide radially along the cavity. The inclined surface of the rhomboid block 602 abuts against the conical surface of the frustum 16, converting the radial movement of the rhomboid block 602 into the axial movement of the frustum 16. The frustum 16 is fixedly connected to the lower end of the rack 603. The rack 603 moves upward and meshes with the gear 1601, driving the gear 1601 to rotate. The gear 1601 transmits power to the rotating shaft 1603 through the bevel gear set 1602. The rotating shaft 1603 drives the rotating disk 501 to rotate. The arc-shaped hole 14 on the rotating disk 501 drives the guide column 13 to move along the arc-shaped trajectory, thereby driving the moving rod 503 and the support plate 504 to extend radially outward along the fixed track disk 502. The greater the tilt angle of the movable disk 12, the more spring rods 601 are pressed or the greater the compression, the greater the rise of the frustum column 16, the longer the stroke of the rack 603, the greater the rotation angle of the rotating disk 501, and the greater the extension of the support plate 504. S6, the connecting mechanism 15 locks the support plate 504. When the four support plates 504 are extended into place, the telescopic plate 1501 inside each support plate 504 is pulled out during the extension process to fill the gap between adjacent support plates 504. The telescopic plate 1501 is fixedly connected to the adjacent support plate 504 by the fixing bolt 1502, so that the four support plates 504 form a complete annular bearing surface.

[0036] Example 2 In this embodiment, the same structure as in Embodiment 1 will not be described again. In the above embodiment, there is no connection between the upper and lower inner support bodies 2, which makes it difficult to form an effective auxiliary connection structure between the upper and lower inner supports. Each layer of support is basically in an independent working state, which leads to problems such as misalignment of the axes and asynchronous force on the upper and lower supports during construction. This results in uneven distribution of support force along the depth of the foundation pit, making it difficult to form a coordinated overall spatial structure.

[0037] Based on the above problems, in this embodiment, as follows: Figure 1 , Figure 2 and Figure 9As shown, grooves 7 are provided on the upper and lower sides of the inner support body 2 near both ends. Each groove 7 is equipped with a folding and flipping mechanism. The folding and flipping mechanisms of the upper and lower layers can be flipped out from the grooves 7 and are relatively fixedly connected. The folding and flipping mechanism includes a position locking component 8 and a connecting rod folding component. The position locking component 8 is connected to the connecting rod folding component to enable the upper and lower inner support bodies 2 to be relatively fixedly connected, thereby increasing the stability of the support effect of the upper and lower inner support bodies 2.

[0038] Specifically, the position locking component 8 includes locking holes 801 and locking bolts 802; there are several locking holes 801, which are opened in the groove 7. The connecting rod folding component is installed in the groove 7, and the locking bolts 802 are threadedly connected to the locking holes 801. When the connecting rod folding component is flipped into place, the locking bolts 802 are threadedly connected to the locking holes 801 to lock the position of the connecting rod folding component and prevent the connecting rod folding component from flipping during the connection process.

[0039] The linkage folding assembly includes two sets of linkage components and a flipping frame 18. Each set of linkage components includes an outer rod 9 and an inner rod 17. The inner rod 17 and the outer rod 9 of both sets rotate between the flipping frame 18 and the groove 7. The inner rod 17 and the outer rod 9 are located on both sides of the flipping frame 18, and the outer rod 9 is located outside the inner rod 17. When flipping, the operator manually flips the flipping frame 18. After flipping, it is locked by locking bolt 802. The upper and lower inner support bodies 2 can be relatively fixedly connected by the two adjacent flipping frames 18, which improves the overall rigidity and support stability of the upper and lower inner support system.

[0040] Compared to Embodiment 1, in this embodiment, a foldable and flip-up mounting connection mechanism 15 is provided between the upper and lower inner support bodies 2 to improve the overall support stability of the inner support body 2.

[0041] Working principle: The deep foundation pit support structure adjacent to existing buildings includes the following steps: S1, Install steel guard plate 1. Install steel guard plate 1 inside the foundation pit to form a retaining structure around the foundation pit. S2, Install the inner support body 2, install several inner support bodies 2 between the steel guard plate 1, and apply a horizontal support force to the steel guard plate 1 through the inner support body 2 to achieve the inner support of the steel guard plate 1. S3, Adjust the telescopic mechanism, adjust the total length of the inner support body 2 through the telescopic mechanisms at both ends of the inner support body 2, so that the adjusting support mechanism abuts against the steel guard plate 1. S4, the angle adjustment component adjusts the tilt angle of the movable plate 12 by adjusting the elongation of the three sets of adjustment components 11. When the elongation of the three sets of adjustment components 11 is the same, the movable plate 12 is parallel to the fixed plate 10, which is suitable for the straight support condition. When the elongation of the three sets of adjustment components 11 is different, the movable plate 12 tilts, which is suitable for the inclined support condition. The tilt angle is determined by the difference in the elongation of the three sets of adjustment components 11. The larger the difference, the larger the tilt angle. S5, the linkage component 6 triggers the expansion component 5 to expand. When the movable disk 12 tilts, the bottom surface of the movable disk 12 presses against the corresponding spring rod 601, causing the spring rod 601 to move along the cavity. The compressed spring rod 601 pushes the corresponding rhomboid block 602 to slide radially along the cavity. The inclined surface of the rhomboid block 602 abuts against the conical surface of the frustum 16, converting the radial movement of the rhomboid block 602 into the axial movement of the frustum 16. The frustum 16 is fixedly connected to the lower end of the rack 603. The rack 603 moves upward and meshes with the gear 1601, driving the gear 1601 to rotate. The gear 1601 transmits power to the rotating shaft 1603 through the bevel gear set 1602. The rotating shaft 1603 drives the rotating disk 501 to rotate. The arc-shaped hole 14 on the rotating disk 501 drives the guide column 13 to move along the arc-shaped trajectory, thereby driving the moving rod 503 and the support plate 504 to extend radially outward along the fixed track disk 502. The greater the tilt angle of the movable disk 12, the more spring rods 601 are pressed or the greater the compression, the greater the rise of the frustum column 16, the longer the stroke of the rack 603, the greater the rotation angle of the rotating disk 501, and the greater the extension of the support plate 504. S6, the connecting mechanism 15 locks the support plate 504. After the four support plates 504 are extended into place, the telescopic plate 1501 inside each support plate 504 is pulled out during the extension process to fill the gap between adjacent support plates 504. The telescopic plate 1501 is fixedly connected to the adjacent support plate 504 by the fixing bolts 1502, so that the four support plates 504 form a complete annular bearing surface. S7, the folding and flipping mechanism connects the upper and lower inner support bodies 2, flipping the connecting rod folding assembly stored in the groove 7 out of the groove 7. The two sets of connecting rod components unfold under the drive of the flipping frame 18. Through the cooperation of the locking bolt 802 and the locking hole 801, the connecting rod folding assembly is locked in the preset position to ensure that a rigid connection is formed between the upper and lower inner support bodies 2. After the upper and lower supports are connected by the folding and flipping mechanism, an overall space truss system is formed.

[0042] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. The basic concept of the present invention lies in adjusting the setting of the support mechanism so that when the diagonal bracing is used, the larger the angle, the larger the support area, thereby improving the support stability. Moreover, a foldable and lockable folding mechanism is set between the upper and lower inner support bodies to achieve a rapid rigid connection between the upper and lower supports and the coordinated force bearing of the space truss, thereby comprehensively improving the deformation control capability, local crush resistance capability, and overall stability of the support structure against adjacent existing buildings. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A deep foundation pit support structure adjacent to an existing building, including a steel protective plate (1) installed in the foundation pit, characterized in that, Several inner support bodies (2) installed between the steel guard plates (1); Both ends of the inner support body (2) are provided with telescopic mechanisms, and each end of the telescopic mechanism is fixed with an adjusting support mechanism, which abuts against the steel guard plate (1). The adjustment support mechanism includes an angle adjustment component, an extension component (5) and a linkage component (6). The angle adjustment component is fixedly connected to the end of the movable section of the telescopic mechanism. The extension component (5) is installed on the side of the angle adjustment component away from the telescopic mechanism. The angle adjustment component and the extension component (5) are connected by a transmission through the linkage component (6). The inner support body (2) has grooves (7) on both sides and near both ends. Each groove (7) is provided with a folding and flipping mechanism. The folding and flipping mechanisms of the upper and lower layers can flip out from the grooves (7) and the folding and flipping mechanisms of the upper and lower layers are relatively fixedly connected. The folding and flipping mechanism includes a position locking component (8) and a link folding component, wherein the position locking component (8) is connected to the link folding component in a transmission manner.

2. The deep foundation pit support structure adjacent to existing buildings according to claim 1, characterized in that, The angle adjustment assembly includes a fixed plate (10), three sets of adjustment components (11), and a movable plate (12). The fixed disk (10) is fixed on the end of the telescopic mechanism. The three sets of adjustment components (11) are ball-jointed on the fixed disk (10), and the three sets of adjustment components (11) are arranged in a circumferential array. The end of the movable disk (12) facing the fixed disk (10) is ball-jointed with the three sets of adjustment components (11). The extension component (5) is installed on the side of the movable disk (12) away from the fixed disk (10).

3. The deep foundation pit support structure adjacent to existing buildings according to claim 2, characterized in that, Each set of adjustment components (11) includes a fixed sleeve (1101), a movable insert rod (1102), and a locking assembly; The fixed sleeve (1101) is ball-hinged to the fixed disk (10), and the movable rod (1102) is guided and inserted into the fixed sleeve (1101). The end of the movable rod (1102) away from the fixed sleeve (1101) is ball-hinged to the movable disk (12). The fixed sleeve (1101) and the movable insert (1102) are fixedly connected relative to each other by a locking assembly.

4. The deep foundation pit support structure adjacent to existing buildings according to claim 2 or 3, characterized in that, The extension component (5) includes a rotating disk (501), a fixed track disk (502), four moving rods (503) and four support plates (504). The rotating disk (501) rotates on the movable disk (12), the fixed track disk (502) rotates on the rotating disk (501), and the fixed track disk (502) is fixedly connected to the movable disk (12) through the base. The moving rod (503) slides within the fixed track disk (502), and one end of the moving rod (503) that protrudes from the fixed track disk (502) is fixedly connected to the support plate (504). A guide post (13) is fixed on the moving rod (503), and an arc-shaped hole (14) is provided on the rotating disk (501) for guiding the movement of the guide post (13). The rotating disk (501) is connected to the linkage component (6) via a transmission.

5. The deep foundation pit support structure adjacent to existing buildings according to claim 4, characterized in that, Each of the support plates (504) has a storage slot inside, and a connecting mechanism (15) is provided in the storage slot. The connecting mechanism (15) can fix adjacent support plates (504) to each other.

6. The deep foundation pit support structure adjacent to existing buildings according to claim 5, characterized in that, The connecting mechanism (15) includes a telescopic plate (1501) that slides within the storage slot and a fixing bolt (1502). One end of the telescopic plate (1501) is fixed to the inner wall of the storage slot, and the other end of the telescopic plate (1501) extends out of the storage slot. The telescopic plate (1501) can be fixedly connected to the adjacent support plate (504) by fixing bolts (1502).

7. The deep foundation pit support structure adjacent to existing buildings according to claim 6, characterized in that, The linkage assembly (6) includes a spring rod (601), a rhomboid block (602), a rack (603), and a transmission component; The spring rods (601) are a plurality of each other and are arranged in a circumferential array on the fixed disk (10). The fixed disk (10) has a cavity, and the spring rods (601) are installed in the cavity. The rhombus blocks (602) are a plurality of each other and are arranged in a circumferential array to slide in the cavity. The rhombus blocks (602) abut against the corresponding spring rods (601). The rack (603) slides on the fixed disk (10) through the connecting seat. A frustum column (16) is fixed to one end of the rack (603) facing the fixed disk (10). The frustum column (16) abuts against the plurality of rhombus blocks (602). The rack (603) is connected to the transmission component, and the transmission component is fixedly connected to the rotating disk (501).

8. The deep foundation pit support structure adjacent to existing buildings according to claim 7, characterized in that, The transmission components include a gear (1601), a bevel gear set (1602), and a rotating shaft (1603). The gear (1601), bevel gear set (1602) and rotating shaft (1603) are all mounted on the fixed disk (10) via a base. The gear (1601) meshes with the rack (603). The gear (1601) and rotating shaft (1603) are connected by transmission through the bevel gear set (1602). The rotating shaft (1603) is fixedly connected to the rotating disk (501).

9. The deep foundation pit support structure adjacent to existing buildings according to claim 1, characterized in that, The position locking assembly (8) includes a locking hole (801) and a locking bolt (802). There are several locking holes (801) and they are opened in the groove (7). The connecting rod folding assembly is installed in the groove (7). The locking bolt (802) is threadedly connected to the locking hole (801). The linkage folding assembly includes two sets of linkage components and a flip frame (18). Each set of linkage components includes an outer rod (9) and an inner rod (17). The inner rod (17) and the outer rod (9) of both sets rotate between the flip frame (18) and the inner groove (7). The inner rod (17) and the outer rod (9) are located on both sides of the flip frame (18), and the outer rod (9) is located outside the inner rod (17).

10. A construction method for a deep foundation pit support structure adjacent to an existing building according to any one of claims 1-9, characterized in that, Includes the following steps: S1, Install steel guard plate (1), install steel guard plate (1) in the foundation pit to form a retaining structure around the foundation pit; S2, install the inner support body (2), install several inner support bodies (2) between the steel guard plate (1), apply horizontal support force to the steel guard plate (1) through the inner support body (2) to achieve the inner support of the steel guard plate (1); S3, Adjust the telescopic mechanism, adjust the total length of the inner support body (2) through the telescopic mechanism at both ends of the inner support body (2), so that the adjustment support mechanism abuts against the steel guard plate (1); S4, Adjusting angle adjustment component, adjusts the tilt angle of movable plate (12) by the elongation of three sets of adjustment components (11). When the elongation of the three sets of adjustment components (11) is the same, movable plate (12) is parallel to fixed plate (10), which is suitable for straight support. When the elongation of the three sets of adjustment components (11) is different, movable plate (12) tilts, which is suitable for inclined support. The tilt angle is determined by the difference in elongation of the three sets of adjustment components (11). The larger the difference, the larger the tilt angle. S5, the linkage component (6) triggers the expansion component (5) to expand. When the movable disk (12) tilts, the bottom surface of the movable disk (12) presses against the spring rod (601) at the corresponding position, causing the spring rod (601) to move along the cavity. The compressed spring rod (601) pushes the corresponding rhombus block (602) to slide radially along the cavity. The inclined surface of the rhombus block (602) abuts against the conical surface of the frustum (16), converting the radial movement of the rhombus block (602) into the axial movement of the frustum (16). The frustum (16) is fixedly connected to the lower end of the rack (603). The rack (603) moves upward and meshes with the gear (1601), driving the gear (1601) to rotate. The gear (1601) transmits power to the rotating shaft (1603) through the bevel gear set (1602). The rotating shaft (1603) drives the rotating disk (501) to rotate. The arc-shaped hole (14) on the rotating disk (501) drives the guide column (13) to move along the arc-shaped trajectory, thereby driving the moving rod (503) and the support plate (504) to extend radially outward along the fixed track disk (502). The greater the tilt angle of the movable disk (12), the more spring rods (601) are pressed or the greater the compression, the greater the rise of the frustum column (16), the longer the stroke of the rack (603), the greater the rotation angle of the rotating disk (501), and the greater the extension of the support plate (504). S6, the connecting mechanism (15) locks the support plate (504). When the four support plates (504) are extended into place, the telescopic plate (1501) inside each support plate (504) is pulled out during the extension process to fill the gap between adjacent support plates (504). The telescopic plate (1501) is fixedly connected to the adjacent support plate (504) by the fixing bolt (1502) so that the four support plates (504) form a complete annular bearing surface. S7, the folding and flipping mechanism connects the upper and lower inner support bodies (2), flipping the connecting rod folding assembly stored in the groove (7) out of the groove (7), and the two sets of connecting rod components unfold under the drive of the flipping frame (18). Through the cooperation of the locking bolt (802) and the locking hole (801), the connecting rod folding assembly is locked in the preset position to ensure that a rigid connection is formed between the upper and lower inner support bodies (2). After the upper and lower supports are connected by the folding and flipping mechanism, an overall space truss system is formed.

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