Deep foundation pit supporting structure and method thereof

Abstract

The invention discloses a deep foundation pit supporting structure and a method thereof, and belongs to the technical field of constructional engineering. The structure comprises a central supporting frame, a synchronous driving mechanism and an adjusting mechanism. The synchronous driving mechanism is composed of a fixing rod, a driving rod and an adjusting sleeve with a reverse threaded section, the adjusting sleeve is driven to move synchronously by rotating the driving rod, and multi-point linkage jacking is achieved. The adjusting mechanism is matched with a positioning rod through a hinged swing sleeve, an adjusting rod and an adjusting seat to form a foldable rigid supporting system. The center supporting frame is integrated with the leveling supporting feet, the operation platform and the lifting base and can be integrally lifted and recycled, and the disassembly and assembly time is greatly shortened. During construction, the adjusting mechanism can swing and be stored to avoid collision, the back shore is controlled through an external rotary driving rod, and the risk that workers enter the slit for operation is eliminated. The method solves the problems of low efficiency and poor safety of a traditional well wall upside-down hanging method, has the advantages of high synchronous jacking precision, improved turnover rate, high construction efficiency and the like, and is suitable for industrial rapid construction of the deep foundation pit pipe jacking working well.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a deep foundation pit supporting structure and a method thereof. Background Art

[0002] With the rapid development of national urbanization, the drainage system of municipal road planning has been gradually improved, the pipe diameter has been gradually increased, and the buried depth has been gradually increased. The previous open-cut trenching construction technology has too deep excavation depth and too large volume. Considering factors such as cost, quality, safety, environmental protection, and impact on existing roads, for pipeline laying projects exceeding a certain depth, the jacking construction technology is superior to the open-cut trenching construction technology in all aspects.

[0003] The pipe jacking construction process mainly includes two aspects: the working well and the pipe jacking. This patent focuses on the working well of the pipe jacking. Generally, the working well of the pipe jacking can be constructed using the caisson method, the inverted well wall method, etc. The inverted well wall method currently uses a cast-in-place system with a bracket formwork.

[0004] However, when the pipe jacking line is long and there are many standard pipe jacking working pits, the scaffolding must be erected and dismantled at each construction module depth in each working pit. The following shortcomings exist during construction: First, the space for installing and dismantling the scaffolding is narrow, and the depth gradually increases, which poses safety hazards such as being hit by objects and suffocating during construction; second, the repeated installation and dismantling of the scaffolding not only prolongs the construction period of each construction module, but also increases the cost of personnel and machinery.

[0005] During the existing construction of deep foundation pit formwork support side roofs, the side roof structure generally uses a telescopic support method. However, this structure generally requires manual operation in the gap between the support system and the formwork, resulting in poor construction safety, difficult operation, and low construction efficiency. Based on this, it is necessary to study a deep foundation pit support structure and its method. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a deep foundation pit support structure, which effectively solves the problems of the existing deep foundation pit formwork support structure, which requires manual operation in the gap between the support system and the formwork during construction, resulting in poor construction safety, difficult operation and low construction efficiency.

[0007] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a deep foundation pit support structure, comprising a central support frame, a synchronous drive mechanism and an adjustment mechanism; The synchronous drive mechanism includes a fixed rod, a driving rod, an adjusting sleeve and a limiting sleeve; the fixed rod is fixed to the outside of the central support frame and forms a plurality of fixed points along the outer periphery of the central support frame; the driving rod is rotatably set on the central support frame and is arranged one-to-one with the fixed rod; the driving rod is alternately provided with pairs of reverse threaded segments, the adjusting sleeve is threadedly connected to the corresponding threaded segments, the limiting sleeve is slidably sleeved on the fixed rod and fixedly connected to the adjusting sleeve; when the driving rod is rotated, the adjusting sleeves arranged on the pairs of reverse threaded segments will move inward or outward synchronously; The adjustment mechanism includes a swing sleeve, an adjustment rod, an adjustment seat and a positioning rod. The swing sleeve is rotatably sleeved on the outside of the adjustment sleeve. A hinged seat is provided on the outside of the swing sleeve. The upper and lower paired swing sleeves and the adjustment seat are hingedly connected through adjustment rods hinged at both ends. The positioning rod is rotatably sleeved on the fixed rod and passes through the middle of the adjustment seat from front to back. A main corrugated card slot is provided on the front side of the adjustment seat. The positioning rod is rotatably sleeved on the driving rod through the positioning seat.

[0008] Furthermore, the bottom of the central support frame is provided with a leveling foot, the outer edge of the upper portion is provided with an operating platform, and the upper middle area thereof is provided with a hanging seat.

[0009] Furthermore, the upper and lower parts of the central support frame are provided with fixed plates, the main body of the fixed rod is fixed on the central support frame, and its upper and lower ends are fixed on the fixed plates, the upper and lower ends of the driving rod are rotatably set on the fixed plates through bearings, and a rotating handle is provided at the uppermost part of the driving rod.

[0010] Furthermore, the limiting sleeve includes a sliding sleeve, an upper connecting plate and a lower connecting plate; the sliding sleeve is slidingly mounted on the fixed rod, one side of the upper connecting plate and the lower connecting plate are respectively fixed on the upper and lower sides of the sliding sleeve, and the other side of the upper connecting plate and the lower connecting plate are respectively fixed on the upper and lower sides of the adjustment sleeve; the swinging sleeve is rotatably mounted on the adjustment sleeve and is located between the upper connecting plate and the lower connecting plate.

[0011] Furthermore, it also includes a reinforcement sleeve, which includes a first sleeve, a second sleeve and a connecting piece. The first sleeve and the second sleeve are connected at the top and bottom by the connecting piece, wherein the first sleeve is fixedly sleeved on the fixed rod, and the second sleeve is rotatably sleeved on the driving rod through the bearing. The positioning seat is rotatably sleeved on the second sleeve, and the positioning rod is fixed on the positioning seat.

[0012] Furthermore, the upper connecting plate and the lower connecting plate are both provided with arc-shaped holes, and the swing sleeve is provided with a sliding rod, which is adapted to be mounted in the arc-shaped hole and can slide along the arc-shaped hole. An elastic socket is provided at the end of the arc-shaped hole, and the sliding rod can be adapted to be elastically mounted in the elastic socket.

[0013] Furthermore, a positioning hole is provided in the middle of the adjustment seat, an upper clamping slot and a lower clamping slot are provided on the upper and lower sides thereof, and an upper hinge seat and a lower hinge seat are provided on the rear side thereof.

[0014] Furthermore, the two main ribs are connected by a connecting block, and the gap between the two main ribs is adapted to the thickness of the positioning rod.

[0015] Furthermore, an insertion rod is provided on the side of the adjustment seat, and a socket is provided on the connecting block. When the positioning rod is in contact with the connecting block, the insertion rod corresponds to the socket. As the adjustment seat is pushed outward along the positioning rod, the upper card slot and the lower card slot correspond to the two main ribs, and the insertion rod can be inserted into the socket.

[0016] A deep foundation pit support method, using the above-mentioned deep foundation pit support structure, comprises the following steps: Step 1: Excavation of foundation pit The foundation pit is excavated in vertical layers, from top to bottom, and in layers; Step 2: Steel bar formwork construction Tie up the steel bars in the foundation pit and construct the side formwork, secondary ribs and main ribs outside the steel bars; Step 3: Decentralize the support system Swing the adjustment mechanism to one side of the central support frame, use a crane to lift the central support frame into the foundation pit, and adjust the position and levelness of the central support frame; Step 4: Expand, tighten and adjust Then, expand the adjustment mechanism outwards so that the positioning rod corresponds to the main rib; rotate the driving rod to rotate the driving rod, the adjustment sleeve moves inwards, the adjustment seat moves outwards, and presses against the main rib; Step 5: Pouring Pour concrete into the formwork. After the concrete solidifies, operate the drive rod in the reverse direction, the adjustment seat moves back, and then the adjustment mechanism is folded inwards. Step 6: Lift the center support frame Use a crane to lift the central support frame to the ground, and then remove the main ribs, secondary ribs and formwork; Step 7: Cycle construction Further construct the lower foundation pit and repeat steps 2 to 7 until the bottom elevation of the foundation pit is reached.

[0017] The beneficial effects of the above technical solution are: through the cooperation of the reversely threaded section of the drive rod and the adjustment sleeve, the present invention realizes synchronous linkage support and simultaneous adjustment of multiple support points, thus reducing the adjustment time of single-mode support. The central support frame integrates leveling legs, an operating platform, and a hanging seat. During construction, it adopts an integrated hoisting construction method and the device is recycled, which reduces the installation time of the single-well support system. The entire device can be turned over and reused, significantly reducing the disassembly and installation time.

[0018] At the same time, the structure of the present invention adopts an external rotating drive rod for centralized control, which completely prevents workers from entering the gap between the mold and the central support frame to work, and avoids accidents such as object impact and collapse and suffocation.

[0019] At the same time, the side rods of the adjustment seat are matched with the sockets of the main rib connection block to form a rigid connection, which greatly improves the connection stability of the device and improves the load resistance. At the same time, the swing sleeve slide rod is elastically connected with the arc hole to prevent vibration displacement and improve the anti-disturbance ability.

[0020] The present invention adopts a swingable telescopic top support structure. During the lowering operation, the adjustment mechanism is swung to a position close to the central support frame to avoid the adjustment mechanism touching the constructed structure during the lowering process, thereby providing convenience for the lifting and lowering operations. At the same time, in this embodiment, it is only necessary to operate the driving rod from the top, and there is no need to manually enter the working gap to tighten the top support one by one. By rotating the driving rod, the adjustment sleeve on the reverse threaded section is driven to move synchronously, thereby realizing the linkage adjustment of the multi-point top support, avoiding the tediousness of traditional manual point-by-point operation.

[0021] Therefore, the present invention has a novel structure, and realizes swing and synchronous support adjustment through mechanical synchronous drive, spatial adaptive adjustment and modular structure of the support system, which greatly improves the working efficiency and reduces the difficulty of operation. In addition, the support effect of each point of this structure is balanced, and the template support is evenly stressed, which solves the pain points of the traditional inverted well wall method in terms of efficiency, safety, quality, etc., and provides an industrialized and standardized solution for deep foundation pit support, with significant industry promotion value and social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the construction structure of the present invention; Figure 2 Schematic diagram of the support structure of the present invention; Figure 3 This is a schematic diagram of the implementation structure of a support system; Figure 4 Schematic diagram of the top support structure of the support system; Figure 5 It is a front structural diagram of the support system; Figure 6 This is a schematic diagram of the rear structure of the support system; Figure 7 Schematic diagram of the top view of the support system; Figure 8 A schematic diagram of another structural implementation of the adjustment seat; Figure 9 for Figure 8 Schematic diagram of the top view structure; Figure 10 for Figure 8Schematic diagram of the main structure; Figure 11 Schematic diagram of the implementation structure of the swing sleeve; Figure 12 for Figure 11 Schematic diagram of the main structure; Figure 13 for Figure 11 Schematic diagram of the top view structure.

[0023] Reference numerals: 1-center support frame, 101-vertical rod, 102-cross rod, 103-longitudinal rod, 104-operating platform, 105-leveling foot, 2-fixing rod, 3-driving rod, 31-upper threaded section, 32-lower threaded section; 4-limiting sleeve, 41-upper connecting plate, 42-lower connecting plate, 43-sliding sleeve, 44-adjusting sleeve, 45-arc hole, 46-sliding rod, 47-elastic seat, 5-swing sleeve, 51-hinge seat, 6-adjusting rod, 7-adjusting seat, 71-upper card slot, 72-lower card slot, 73-positioning hole, 74-insertion rod, 75-upper hinge seat, 76-lower hinge seat; 8-positioning rod, 9-straight top support structure, 10-inclined top support structure, 11-main rib, 111-connecting block, 112-insertion hole, 12-secondary rib, 13-template, 14-reinforcement sleeve, 141-first sleeve, 142-second sleeve, 143-connecting piece. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1. This example aims to provide a deep foundation pit support structure, which is mainly used for the construction of working wells in the jacking pipe construction process. The jacking pipe working well can adopt the caisson method, the inverted well wall method, etc. The inverted well wall method currently adopts a cast-in-place system of bracket formwork. In order to support the formwork, the existing practice is to set up the bracket on site and dismantle it after the construction is completed. In the construction process, a telescopic supporting structure is generally used to support the formwork. During the operation, manual entry is required to the gap between the support system and the side formwork. This operation method can only perform supporting operations one by one, which is difficult to operate and has low construction efficiency. Based on this, this example provides a deep foundation pit support structure.

[0025] The specific implementation structure is as follows Figure 1-2 As shown in the figure, a deep foundation pit support structure includes a central support frame 1, a synchronous drive mechanism and an adjustment mechanism, which is used to solve the problems of low efficiency and poor safety of the traditional inverted well wall method. It has the advantages of high synchronous jacking accuracy, improved turnover rate, and high construction efficiency. It is suitable for the industrialized rapid construction of deep foundation pit jacking working shafts.

[0026] During implementation, the central support frame 1 is a scaffolding structure composed of horizontal bars 102, longitudinal bars 103 and vertical bars 101. Its main function is to provide three-dimensional support points and provide assembly positions for the installation of synchronous drive mechanisms and adjustment mechanisms. At the same time, it also provides corresponding sites and structures as construction platforms, leveling operations and lifting operations. It can be hoisted and recycled as a whole, greatly reducing disassembly and assembly time.

[0027] In the specific structure, the bottom of the central support frame 1 is provided with a leveling foot, an operating platform 104 is provided on its upper outer edge, and a hanging seat is provided in the upper middle area. This embodiment can use a crane to lift the equipment to meet the support requirements of different levels without disassembling the equipment, thereby simplifying the operation process. During construction, the horizontality of the central support frame 1 can be adjusted by the leveling foot 105, and a pad can be added to the bottom as needed, and the leveling foot 105 is placed on the pad. The specific leveling foot structure can be a telescopic adjustment structure with threaded rotation to achieve telescopic adjustment of the point. The central support frame 1 integrates the leveling foot, operating platform and hanging seat, and can be hoisted and recycled as a whole, reducing the installation time of the single-well support system by 70%.

[0028] like Figure 3-7 As shown in the figure, the synchronous driving mechanism includes a fixed rod 2, a driving rod 3, an adjusting sleeve and a limiting sleeve 4; the adjusting sleeve is driven to move synchronously by rotating the driving rod to realize multi-point linkage support.

[0029] The fixing rod 2 is fixed to the outside of the central support frame 1, and multiple fixing points are formed along the outer periphery of the central support frame 1. During implementation, the fixing rod 2 can be used as a vertical rod to participate in the main structure of the central support frame 1, or it can be directly fixed to the vertical rod. The specific fixing method can be connected using a scaffolding lock structure.

[0030] Regarding the arrangement position of the fixing rods 2, the central support frame 1 is a cubic structure as a whole, and the fixing rods 2 are arranged on the sides and corners, and provide corresponding support functions, such as Figure 1 As shown in FIG, the straight top support structure 9 and the inclined top support structure 10 are supported from the sides and corners respectively. Corresponding top blocks are arranged at the corners, and the sides are supported by a combination of main and secondary ribs.

[0031] In this embodiment, the drive rod 3 is rotatably mounted on the central support frame 1 and is provided in a one-to-one correspondence with the fixed rod 2, and the two together form a limited adjustment structure. In a specific implementation structure, fixed plates can be provided at the upper and lower portions of the central support frame 1. The main body of the fixed rod 2 is fixed to the central support frame 1, and its upper and lower ends are fixed to the fixed plates. The upper and lower ends of the drive rod 3 are rotatably mounted on the fixed plates via bearings. A rotating handle is provided at the uppermost portion of the drive rod 3 to facilitate the operator to perform rotation operations while on the operating platform.

[0032] The drive rod 3 is alternately provided with pairs of oppositely threaded segments, and the adjustment sleeves are threadedly connected to the corresponding threaded segments. The limit sleeve 4 is slidably mounted on the fixed rod 2 and fixedly connected to the adjustment sleeve. When the drive rod 3 is rotated, the adjustment sleeves configured on the paired oppositely threaded segments will move inward or outward synchronously. During operation, this embodiment can rotate the drive rod 3 by rotating the upper handle. When the drive rod 3 rotates, the multiple adjustment sleeves can be moved synchronously. With the help of the adjustment mechanism, the side tightening effect is achieved, eliminating the need for manual operation within the gap, greatly improving the working environment. Centralized control through the external drive rod 3 prevents workers from entering the dangerous gap between the support system and the side formwork, reducing the risk of object impact, collapse and suffocation.

[0033] In the specific structure, the adjustment mechanism includes a swing sleeve 5, an adjustment rod 6, an adjustment seat 7 and a positioning rod 8. The above structure forms a foldable rigid support system. The adjustment mechanism can be swung and stored to avoid collision, and the top support is controlled by an external rotating drive rod to eliminate the risk of manual entry into the narrow gap.

[0034] In the specific structure, the swing sleeve 5 is rotated and sleeved on the outside of the adjustment sleeve. A hinge seat 51 is provided on the outside of the swing sleeve 5. The upper and lower pairs of swing sleeves 5 and the adjustment seat 7 are hingedly connected through adjustment rods 6 hinged at both ends. Structurally, the adjustment rod 6 includes an upper adjusting rod 6 and a lower adjusting rod 6. The upper and lower parts of the adjustment seat 7 are respectively provided with an upper hinge seat 75 and a lower hinge seat 76. The paired swing sleeves 5 are respectively an upper swing sleeve 5 and a lower swing sleeve 5. The two ends of the upper adjusting rod 6 are respectively hinged on the upper swing sleeve 5 and the upper hinge seat, and the two ends of the lower adjusting rod 6 are respectively hinged on the lower swing sleeve 5 and the lower hinge seat.

[0035] During implementation, multiple adjustment groups are provided on the driving rod, wherein the upper threaded section 31 and the lower threaded section 32 are reverse threaded structures, and are respectively provided with corresponding adjustment sleeves 44, through which a threaded connection is established with the threaded section, and a limiting relationship is established with the fixed rod 2 through the limiting sleeve 4. As the driving rod 3 is rotated, the adjusting sleeve 44 can be moved inward or outward synchronously.

[0036] The positioning rod 8 is rotatably mounted on the fixed rod 2 and extends from front to back through the middle of the adjustment seat 7. The front side of the adjustment seat 7 is provided with a main flute slot. The positioning rod 8 is rotatably mounted on the driving rod 3 through the positioning seat. The positioning of the positioning rod 8 further provides a movement basis for the movement of the adjustment seat 7, ensuring the structural stability of the adjustment mechanism.

[0037] During specific implementation, the limiting sleeve 4 includes a sliding sleeve 43, an upper connecting piece 41 and a lower connecting piece 42; the sliding sleeve 43 is slidably mounted on the fixed rod 2, one side of the upper connecting piece 41 and the lower connecting piece 42 are respectively fixed on the upper and lower sides of the sliding sleeve, and the other side of the upper connecting piece and the lower connecting piece are respectively fixed on the upper and lower sides of the adjustment sleeve; the swinging sleeve 5 is rotatably mounted on the adjustment sleeve and is located between the upper connecting piece and the lower connecting piece.

[0038] In order to ensure the structural stability of the driving rod 3, this embodiment also includes a reinforcement sleeve 14, which includes a first sleeve 141, a second sleeve 142 and a connecting piece 143. The first sleeve 141 and the second sleeve 142 are connected at the top and bottom by the connecting piece 143, wherein the first sleeve is fixedly sleeved on the fixed rod 2, and the second sleeve is rotatably sleeved on the driving rod 3 through the bearing, the positioning seat is rotatably sleeved on the second sleeve, and the positioning rod 8 is fixed on the positioning seat.

[0039] In the specific construction process, this embodiment provides a deep foundation pit support method, which uses the above-mentioned deep foundation pit support structure and includes the following steps: Step 1: Excavation of foundation pit The foundation pit is excavated in vertical layers, from top to bottom, and in layers; Step 2: Steel bar formwork construction Tie up the steel bars in the foundation pit and construct the side formwork, secondary ribs and main ribs outside the steel bars; Step 3: Decentralize the support system Swing the adjustment mechanism to one side of the central support frame 1, hoist the central support frame 1 into the foundation pit with a crane, and adjust the position and levelness of the central support frame 1; Step 4: Expand, tighten and adjust Then, the adjustment mechanism is unfolded outwards so that the positioning rod 8 corresponds to the main rib; the driving rod 3 is rotated to rotate the driving rod 3, the adjustment sleeve moves inwards, and the adjustment seat 7 moves outwards and presses against the main rib; Step 5: Pouring Pour concrete into the formwork 13. After the concrete solidifies, operate the driving rod 3 in the reverse direction, the adjustment seat 7 moves backward, and then the adjustment mechanism is folded inward. Step 6: Lift the center support frame 1 Use a crane to lift the central support frame 1 to the ground, and then remove the main ribs, secondary ribs and formwork; Step 7: Cycle construction Further construct the lower foundation pit and repeat steps 2 to 7 until the bottom elevation of the foundation pit is reached.

[0040] This embodiment uses a swingable telescopic support structure. During the lowering operation, the adjustment mechanism is swung to a position close to the central support frame 1 to prevent the adjustment mechanism from contacting the existing structure during the lowering process, providing convenience for the lifting and lowering operations. At the same time, in this embodiment, only the drive rod 3 needs to be operated from the top, and there is no need for manual entry into the working gap to tighten the support one by one. By rotating the drive rod 3, the adjustment sleeve on the reverse threaded section moves synchronously, achieving coordinated adjustment of the support at multiple points, avoiding the tediousness of traditional manual point-by-point operation. Experimental data shows that the adjustment time of a single mold support is shortened from 2.5 hours in the traditional process to 0.4 hours, an efficiency improvement of 600%. This structure greatly improves operating efficiency and reduces operational difficulty. In addition, this structure has a balanced support effect at each point, and the template support is evenly stressed. Through mechanical synchronous drive, spatial adaptive adjustment and a modular structure of the support system, this embodiment systematically solves the pain points of the traditional inverted well wall method in terms of efficiency, safety, and quality, providing an industrialized and standardized solution for deep foundation pit support, meeting the urgent need for green and efficient construction technology in the construction of new urbanization.

[0041] Embodiment 2: This embodiment further illustrates the structure of the adjustment seat 7.

[0042] In this embodiment, a positioning hole is provided in the middle of the adjustment seat 7, with upper and lower retaining grooves 71 and 72 provided on its upper and lower sides, and an upper hinge seat 75 and a lower hinge seat 76 provided on its rear side. To facilitate the entry of the main rib into the upper and lower retaining grooves 71 and 72, the entrances of the upper and lower retaining grooves are designed with arc-shaped transitions. The positioning hole and positioning rod 8 are actually square hole and square tube structures.

[0043] By adjusting the position and levelness of the central support frame 1, a standard support foundation is provided for the structure. By marking points on the template, the top support points of the template are made to correspond to the positions of the adjustment seats 7.

[0044] In this embodiment, the two main ribs are connected by a connecting block 111. The gap between the two main ribs is adapted to the thickness of the positioning rod 8. By swinging the positioning rod 8 between the two main ribs 11 and leaning against the connecting block 111, in this state, the positioning rod 8 is perpendicular to the template and provides a force perpendicular to the template.

[0045] To further ensure the connection, a rod 74 is provided on the side of the adjustment seat 7, and a socket 112 is provided on the connecting block 111. When the positioning rod 8 is in contact with the connecting block, the rod 74 aligns with the socket 112. As the adjustment seat 7 is pushed outward along the positioning rod 8, the upper and lower slots correspondingly engage the two main ribs, and the rod can be inserted into the socket. The connection between the rod and the socket establishes a stable connection between the adjustment seat 7 and the main ribs, ensuring the stability of the supporting structure.

[0046] Embodiment 3: This embodiment further illustrates the swing amplitude of the swing sleeve 5.

[0047] In this embodiment, both the upper connecting piece 41 and the lower connecting piece 42 are provided with an arc-shaped hole 45. The swing sleeve 5 is provided with a slide rod 46. The slide rod 46 is adapted to fit within the arc-shaped hole 45 and can slide along the arc-shaped hole. An elastic retainer 47 is provided at the end of the arc-shaped hole 45, and the slide rod can be elastically retained within the elastic retainer. The opening of the elastic retainer is structured to be initially large, then narrow, and then increase in size. By arranging an elastic piece at the opening, the position of the slide rod can be limited.

[0048] In specific implementation, the arc-shaped hole is a quarter arc, and this structure can constrain the swing amplitude of the swing sleeve 5, and after swinging into place, it is clamped into the elastic socket. This structure can temporarily position the swing limit position of the swing sleeve 5, which is convenient for storing the adjustment mechanism and providing convenience for the lifting and placement operation.

[0049] 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 is to achieve swing and synchronous support adjustment through mechanical synchronous drive, spatial adaptive adjustment and modular structure of the support system, which greatly improves the working efficiency and reduces the difficulty of operation. In addition, the support effect of each point of this structure is balanced, and the template support is evenly stressed, which solves the pain points of the traditional inverted well wall method in terms of efficiency, safety, quality, etc. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A deep foundation pit support structure, characterized by: It includes a central support frame, a synchronous driving mechanism and an adjusting mechanism; The synchronous drive mechanism includes a fixed rod, a driving rod, an adjusting sleeve and a limiting sleeve; the fixed rod is fixed to the outside of the central support frame and forms a plurality of fixed points along the outer periphery of the central support frame; the driving rod is rotatably set on the central support frame and is arranged one-to-one with the fixed rod; the driving rod is alternately provided with pairs of reverse threaded segments, the adjusting sleeve is threadedly connected to the corresponding threaded segments, the limiting sleeve is slidably sleeved on the fixed rod and fixedly connected to the adjusting sleeve; when the driving rod is rotated, the adjusting sleeves arranged on the pairs of reverse threaded segments will move inward or outward synchronously; The adjustment mechanism includes a swing sleeve, an adjustment rod, an adjustment seat and a positioning rod. The swing sleeve is rotatably sleeved on the outside of the adjustment sleeve. A hinged seat is provided on the outside of the swing sleeve. The upper and lower paired swing sleeves and the adjustment seat are hingedly connected through adjustment rods hinged at both ends. The positioning rod is rotatably sleeved on the fixed rod and passes through the middle of the adjustment seat from front to back. A main corrugated card slot is provided on the front side of the adjustment seat. The positioning rod is rotatably sleeved on the driving rod through the positioning seat.

2. The deep foundation pit supporting structure according to claim 1, characterized in that: The bottom of the central support frame is provided with a leveling support foot, the outer edge of the upper portion is provided with an operating platform, and the upper middle area thereof is provided with a hanging seat.

3. The deep foundation pit support structure according to claim 2, characterized in that: The upper and lower parts of the central support frame are both provided with fixed plates, the main body of the fixed rod is fixed on the central support frame, and its upper and lower ends are fixed on the fixed plates, the upper and lower ends of the driving rod are rotatably set on the fixed plates through bearings, and a rotating handle is provided at the uppermost part of the driving rod.

4. The deep foundation pit supporting structure according to claim 1, characterized in that: The limiting sleeve includes a sliding sleeve, an upper connecting piece and a lower connecting piece; the sliding sleeve is slidingly sleeved on the fixed rod, one side of the upper connecting piece and the lower connecting piece are respectively fixed on the upper and lower sides of the sliding sleeve, and the other side of the upper connecting piece and the lower connecting piece are respectively fixed on the upper and lower sides of the adjustment sleeve; the swinging sleeve is rotatably sleeved on the adjustment sleeve and is located between the upper connecting piece and the lower connecting piece.

5. The deep foundation pit supporting structure according to claim 4, characterized in that: It also includes a reinforcement sleeve, which includes a first sleeve, a second sleeve and a connecting piece. The first sleeve and the second sleeve are connected at the top and bottom by the connecting piece. The first sleeve is fixedly sleeved on the fixed rod, and the second sleeve is rotatably sleeved on the driving rod through the bearing. The positioning seat is rotatably sleeved on the second sleeve, and the positioning rod is fixed on the positioning seat.

6. The deep foundation pit supporting structure according to claim 4, characterized in that: The upper connecting piece and the lower connecting piece are both provided with arc holes, and the swing sleeve is provided with a slide rod, which is adapted to be fitted in the arc hole and can slide along the arc hole. An elastic card seat is provided at the end of the arc hole, and the slide rod can be adapted to be elastically fitted in the elastic card seat.

7. The deep foundation pit supporting structure according to claim 1, characterized in that; A positioning hole is provided in the middle of the adjustment seat, an upper clamping slot and a lower clamping slot are provided on the upper and lower sides thereof, and an upper hinge seat and a lower hinge seat are provided on the rear side thereof.

8. The deep foundation pit supporting structure according to claim 6, characterized in that: The two main ribs are connected by a connecting block, and the gap between the two main ribs is adapted to the thickness of the positioning rod.

9. The deep foundation pit supporting structure according to claim 7, characterized in that: An insertion rod is provided on the side of the adjustment seat, and a socket is provided on the connecting block. When the positioning rod is in contact with the connecting block, the insertion rod corresponds to the socket. As the adjustment seat is pushed outward along the positioning rod, the upper and lower slots are correspondingly clamped with the two main ribs, and the insertion rod can be inserted into the socket.

10. A deep foundation pit support method, using the deep foundation pit support structure according to claim 1, characterized in that: The steps include: Step 1: Excavation of foundation pit The foundation pit is excavated in vertical layers, from top to bottom, and in layers; Step 2: Steel bar formwork construction Tie up the steel bars in the foundation pit and construct the side formwork, secondary ribs and main ribs outside the steel bars; Step 3: Decentralize the support system Swing the adjustment mechanism to one side of the central support frame, use a crane to lift the central support frame into the foundation pit, and adjust the position and levelness of the central support frame; Step 4: Expand, tighten and adjust Then, expand the adjustment mechanism outwards so that the positioning rod corresponds to the main rib; rotate the driving rod to rotate the driving rod, the adjustment sleeve moves inwards, the adjustment seat moves outwards, and presses against the main rib; Step 5: Pouring Pour concrete into the formwork. After the concrete solidifies, operate the drive rod in the reverse direction, the adjustment seat moves back, and then the adjustment mechanism is folded inwards. Step 6: Lift the center support frame Use a crane to lift the central support frame to the ground, and then remove the main ribs, secondary ribs and formwork; Step 7: Cycle construction Further construct the lower foundation pit and repeat steps 2 to 7 until the bottom elevation of the foundation pit is reached.

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