Reverse jacking device for dismantling foundation pit support

Abstract

The invention relates to the technical field of buildings, and discloses a reverse jacking device for removing a foundation pit support, which comprises a foundation pit coaming arranged on the periphery of a foundation pit, a basement wallboard is arranged in the foundation pit coaming, a floor plate is mounted on the basement wallboard, and a support beam is further mounted on the basement wallboard. Through the design of the expansion plate in the reverse jacking assembly, the contact area with the foundation pit surrounding plate is increased, reverse jacking force is evenly distributed to prevent the surrounding plate from being damaged due to overlarge local stress, meanwhile, the locking assembly can rapidly lock the piston rod when the hydraulic cylinder loses pressure, retraction of the piston rod is effectively prevented, stable and reliable reverse jacking support is provided for the supporting beam dismantling process, and the construction efficiency is improved. The operation safety is ensured; on the other hand, the operation safety can be guaranteed, in the reset stage, the push rod is used for driving the clamping plate to move in the direction where the cross sectional area of the locking groove becomes larger, pressure in the high-pressure locking state is gradually released, damage to parts caused by forced reset is avoided, the risk of safety accidents in the operation process is reduced, and an operator can conduct reset operation more safely.

Description

Technical Field

[0001] This invention belongs to the field of building technology, and more specifically, relates to an anti-roofing device for dismantling foundation pit supports. Background Technology

[0002] In the field of building construction, the removal of foundation pit supports is a key step in the construction of basement structures. In particular, during the removal of support beams, it is necessary to provide effective top support for the foundation pit enclosure to prevent safety accidents such as foundation pit deformation and collapse.

[0003] Currently, most anti-jacking devices in the industry rely on hydraulic cylinders to directly apply jacking force. The contact parts between these devices and the pit retaining wall are mostly fixed-size jacking plates with a small contact area. The jacking force is concentrated on a localized area of ​​the retaining wall, which can easily lead to cracks or even damage due to uneven stress, affecting the stability of the pit structure. At the same time, it has been found that the locking mechanism of existing anti-jacking devices has problems during use. When the hydraulic cylinder loses pressure, the piston rod is prone to retracting under the reverse force of the pit retaining wall, making it difficult to maintain a stable anti-jacking state and posing a safety hazard when removing the support beam. During the reset phase, the pressure at the connection point is extremely high when the locking component is locked under high pressure. Traditional devices lack an effective pressure relief mechanism and require forced unlocking. Some technologies use bolts to fix the locking position. After the bolts are removed, the pressure is released instantly, which may cause the piston rod to suddenly retract, causing impact damage to the device, threatening the safety of operators, and affecting the stability of the pit retaining wall. This increases the difficulty of operation, reduces the life of the device, and increases the risk of safety accidents.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: An anti-roofing device for removing foundation pit supports includes a foundation pit enclosure panel arranged around the foundation pit, a basement wall panel arranged inside the foundation pit enclosure panel, a floor slab installed on the basement wall panel, and a support beam installed on the basement wall panel.

[0006] An anti-roof assembly is provided between the foundation pit enclosure slab and the floor slab; The anti-roof assembly includes a hydraulic cylinder installed on the floor slab and a piston rod inserted inside it. The end of the piston rod corresponds to the pit enclosure plate. A pressure rod that retracts when squeezed is installed at the end of the piston rod. The retracted pressure rod causes the expansion plate slidably connected to the end of the piston rod to move outward, thereby increasing the contact area. A locking assembly is installed between the piston rod and the floor slab. The locking assembly includes a locking plate installed on the floor slab. The locking plate has a locking groove. The cross-sectional area of ​​the locking groove on the side away from the piston rod is smaller than the cross-sectional area at the other end. A retaining plate that is tilted is rotatably installed on the piston rod, and the end of the retaining plate overlaps the locking groove at an angle.

[0007] In a preferred embodiment of the present invention, the vertical distance between each position of the basement wall panel and the foundation pit enclosure is equal, and columns are installed at the four corners of the basement wall panel, the columns being integrally cast with the foundation pit foundation.

[0008] In a preferred embodiment of the present invention, a fixing protrusion is provided on the floor slab. The fixing protrusion is in the shape of a right trapezoid. The fixing protrusion and the floor slab are integrally cast together. Reinforcing bars are provided between the floor slab and the fixing protrusion. The reinforcing bars are in the shape of an L.

[0009] In a preferred embodiment of the present invention, the hydraulic cylinder housing is bolted to the fixed protruding end face, and a through hole is provided in the basement wall panel, through which the hydraulic cylinder housing moves movably.

[0010] In a preferred embodiment of the present invention, the piston rod is hollow, and a reinforcing rod is installed on the inner cavity of the piston rod to improve the structural strength of the piston rod. A pressure plate is inserted into the piston rod, and the pressure plate is movably inserted into the reinforcing rod. The center of the pressure plate passes through the pressure rod. A rocker arm is movably installed on the back of the pressure plate. The rocker arm is in an inclined state, and a slider is movably installed at the end of the rocker arm. The slider is connected to the side wall of the expansion plate.

[0011] In a preferred embodiment of the present invention, a limiting groove is provided at the end of the piston rod, and the limiting groove is movably connected to the slider. The slider and the expansion plate are L-shaped. A limiting rod is installed through the slider. The top of the limiting rod is installed on the inner wall of the piston rod. A limiting spring is sleeved on the limiting rod. One end of the limiting spring is engaged with the inner wall of the piston rod, and the other end of the limiting spring is engaged with the side wall of the slider.

[0012] In a preferred embodiment of the present invention, an insert plate is installed on the side wall of the pressure plate, and a pair of guide plates are installed on the other end of the piston rod. The insert plate is movably inserted between the pair of guide plates, and an insertion hole is provided on the insert plate. A through groove is provided on the pair of guide plates. The through groove is adapted to the specification of the insertion hole, and a positioning component is installed on the piston rod. The positioning component is used to automatically insert and lock when the through groove and the insertion hole correspond.

[0013] In a preferred embodiment of the present invention, the positioning component includes a positioning post, which is adapted to the specifications of the through slot and the insertion hole. The positioning post is movably connected to the piston rod. A pull plate is installed on the top of the positioning post, and a baffle is installed on the side wall of the positioning post. A compression spring is sleeved on the positioning post located on the inner wall of the piston rod. One end of the compression spring is engaged with the inner wall of the piston rod, and the other end of the compression spring is engaged with the baffle.

[0014] In a preferred embodiment of the present invention, a push rod is inserted into the side wall of the piston rod. One end of the push rod is rotatably connected to the clamping plate, and the other end of the push rod has an inclined surface. The diameter of the push rod is adapted to the size of the connecting groove opened on the side wall of the inserting plate, and the connecting groove is connected to the insertion hole.

[0015] In a preferred embodiment of the present invention, a reset cover is installed on the side wall of the piston rod, the reset cover is movably connected to the push rod, a reset plate is slidably disposed inside the reset cover, and the reset plate is connected to the side wall of the push rod. A reset spring is sleeved on the push rod, one end of the reset spring is engaged with the side wall of the reset cover, and the other end is engaged with the reset plate.

[0016] Compared with the prior art, the present invention has the following advantages: This invention increases the contact area with the pit enclosure by designing an expansion plate in the anti-jacking assembly, thus distributing the anti-jacking force evenly to prevent excessive local stress and damage to the enclosure. Simultaneously, the locking assembly can quickly lock the piston rod when the hydraulic cylinder loses pressure, effectively preventing its retraction and providing stable and reliable anti-jacking support during the dismantling of the support beam, ensuring operational safety. Furthermore, it ensures operational safety by using a push rod to move the locking plate along the direction of increasing cross-sectional area of ​​the locking groove during the reset phase, gradually releasing the pressure under high-pressure locking, preventing forced reset from damaging components, reducing the risk of safety accidents caused by equipment malfunctions during operation, and allowing operators to perform reset operations more safely.

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] In the attached diagram: Figure 1 This is an installation structure diagram of an anti-roofing device used for the removal of foundation pit supports; Figure 2 This is an overall diagram of a jacking device used for dismantling foundation pit supports; Figure 3 An internal view of an anti-roofing device used for dismantling foundation pit supports; Figure 4 A jacking device for dismantling foundation pit supports. Figure 3 Sectional view; Figure 5 A jacking device for dismantling foundation pit supports. Figure 4 Enlarged view of point A in the middle; Figure 6 A three-dimensional diagram of the anti-roofing component of an anti-roofing device for the removal of foundation pit supports; Figure 7 The piston rod inside a reverse jacking device for dismantling foundation pit supports. Figure 1 ; Figure 8 A partial view of a jacking device for dismantling foundation pit supports. Figure 1 ; Figure 9 The piston rod inside a reverse jacking device for dismantling foundation pit supports. Figure 2 ; Figure 10 A partial view of a jacking device for dismantling foundation pit supports. Figure 2 ; Figure 11 This is a cross-sectional view of the reset cover of an anti-roofing device used for the removal of foundation pit supports.

[0019] In the diagram: 1. Excavation pit enclosure; 11. Basement wall panel; 111. Column; 112. Through hole; 12. Floor slab; 121. Fixing protrusion; 13. Support beam; 2. Anti-top assembly; 21. Hydraulic cylinder; 211. Piston rod; 212. Reinforcing rod; 22. Expansion plate; 221. Pressure rod; 222. Pressure plate; 223. Rocker arm; 224. Slider; 225. Limiting rod; 226. Limiting spring; 227. Limiting groove; 23. Insert plate; 231. Insertion hole; 232. Guide plate; 233. Through groove; 24. Positioning post; 241. Pull plate; 242. Baffle; 243. Compression spring; 3. Locking plate; 31. Locking groove; 311. Clamping plate; 32. Push rod; 321. Inclined surface; 322. Connecting groove; 43. Reset cover; 431. Reset plate; 432. Reset spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0021] Example 1: As Figures 1 to 11 As shown, a top-removing device for the removal of foundation pit supports includes a foundation pit enclosure 1 set around the foundation pit, a basement wall panel 11 set inside the foundation pit enclosure 1, a floor slab 12 installed on the basement wall panel 11, and a support beam 13 installed on the basement wall panel 11.

[0022] An anti-top component 2 is installed between the foundation pit enclosure 1 and the floor slab 12; The anti-roof assembly 2 includes a hydraulic cylinder 21 installed on the floor slab 12 and a piston rod 211 inserted inside it. The end of the piston rod 211 corresponds to the pit enclosure 1. A pressure rod 221 that is compressed and retracts is installed at the end of the piston rod 211. The retracted pressure rod 221 drives the expansion plate 22 that is slidably connected to the end of the piston rod 211 to move outward, thereby increasing the contact area. A locking assembly is installed between the piston rod 211 and the floor slab 12. The locking assembly includes a locking plate 3 installed on the floor slab 12. The locking plate 3 has a locking groove 31. The cross-sectional area of ​​the locking groove 31 on the side away from the piston rod 211 is smaller than that on the other end. A tilted clamping plate 311 is rotatably installed on the piston rod 211, and the end of the clamping plate 311 is tilted and overlaps the locking groove 31. The anti-jacking assembly 2 can increase the contact area by retracting the pressure rod 221 to drive the expansion plate 22 to move outward, ensuring uniform anti-jacking force. The locking assembly utilizes the difference in cross-sectional area of ​​the locking groove 31 and the tilted state of the clamping plate 311 to provide a basis for the subsequent locking function. The overall structural layout lays the hardware foundation for the anti-jacking operation of the foundation pit support removal.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in the specific embodiment, the vertical distance between each position of the basement wall panel 11 and the foundation pit enclosure 1 is equal. Columns 111 are installed at the four corners of the basement wall panel 11, and the columns 111 are integrally cast with the foundation pit foundation. The equal vertical distance between each position of the basement wall panel 11 and the foundation pit enclosure 1 ensures the symmetry of the counter-pressure effect; the integral casting of the columns 111 with the foundation pit foundation enhances the structural stability of the basement wall panel 11, providing stable installation support for components such as the floor slab 12 and the support beam 13.

[0024] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, furthermore, a fixed protrusion 121 is provided on the floor slab 12. The fixed protrusion 121 is a right-angled trapezoid and is integrally cast with the floor slab 12. Reinforcing bars are provided between the floor slab 12 and the fixed protrusion 121, and these reinforcing bars are L-shaped. The outer shell of the hydraulic cylinder 21 is bolted to the end face of the fixed protrusion 121. A through hole 112 is provided on the basement wall panel 11, through which the outer shell of the hydraulic cylinder 21 movably passes. The fixed protrusion 121 is integrally cast with the floor slab 12 and contains L-shaped reinforcing bars, which improves the structural strength of the fixed protrusion 121 and provides a stable installation foundation for the hydraulic cylinder 21. The through hole 112 facilitates the penetration of the hydraulic cylinder 21 outer shell through the basement wall panel 11, ensuring that the piston rod 211 can be accurately aligned with the pit enclosure 1, thus guaranteeing the installation accuracy and operational stability of the anti-roofing component 2.

[0025] Example 2: The difference between this example and the above examples is as follows: Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the piston rod 211 is hollow, and a reinforcing rod 212 is installed inside the piston rod 211 to improve its structural strength. A pressure plate 222 is inserted into the piston rod 211, and the pressure plate 222 is movably connected to the reinforcing rod 212. The center of the pressure plate 222 passes through the pressure rod 221. A rocker arm 223 is movably installed on the back of the pressure plate 222. The rocker arm 223 is tilted, and a slider 224 is movably installed at the end of the rocker arm 223. The slider 224 is connected to the side wall of the expansion plate 22. The piston rod 211 adopts a hollow structure and has a built-in reinforcing rod 212, which reduces weight while improving structural strength. The cooperation of the pressure plate 222, rocker arm 223, and slider 224 converts the retraction force of the pressure rod 221 into the outward movement force of the expansion plate 22, realizing the stable expansion of the expansion plate 22 and further optimizing the transmission process with increased contact area.

[0026] like Figure 7 and Figure 8 As shown, in a specific embodiment, a limiting groove 227 is provided at the end of the piston rod 211, and the limiting groove 227 is movably connected to the slider 224. The slider 224 and the expansion plate 22 are L-shaped. A limiting rod 225 is installed through the slider 224, and the top of the limiting rod 225 is installed on the inner wall of the piston rod 211. A limiting spring 226 is sleeved on the limiting rod 225. One end of the limiting spring 226 is engaged with the inner wall of the piston rod 211, and the other end of the limiting spring 226 is engaged with the side wall of the slider 224. The limiting groove 227 restricts the movement trajectory of the slider 224, ensuring that the expansion plate 22 moves outward in a preset direction. The cooperation of the limiting rod 225 and the limiting spring 226 guides and resets the movement of the slider 224, preventing the slider 224 from deviating. At the same time, it assists the expansion plate 22 in resetting when it is not under force, ensuring the working stability of the expansion assembly.

[0027] like Figure 7 and Figure 9 As shown, further, a plate 23 is installed on the side wall of the pressure plate 222, and a pair of guide plates 232 are installed on the other end of the piston rod 211. The plate 23 is movably inserted between the pair of guide plates 232, and the plate 23 has an insertion hole 231. The pair of guide plates 232 have through grooves 233, which are compatible with the specifications of the insertion hole 231. A positioning component is installed on the piston rod 211. The positioning component is used to automatically insert and lock when the through groove 233 and the insertion hole 231 correspond. The guide plate 232 provides guidance for the sliding of the plate 23, ensuring that the plate 23 moves smoothly. The cooperation between the insertion hole 231 and the through groove 233 and the setting of the positioning component can automatically lock the plate 23 when the expansion plate 22 reaches the preset expansion state, thereby fixing the position of the expansion plate 22, ensuring stable contact area, and enhancing the reliability of the top-down operation.

[0028] like Figure 9As shown, the positioning component further includes a positioning post 24, which is compatible with the through slot 233 and the insertion hole 231. The positioning post 24 is movably connected to the piston rod 211. A pull plate 241 is installed on the top of the positioning post 24, and a baffle 242 is installed on the side wall of the positioning post 24. A compression spring 243 is sleeved on the positioning post 24 located on the inner wall of the piston rod 211. One end of the compression spring 243 is engaged with the inner wall of the piston rod 211, and the other end is engaged with the baffle 242. Under the elastic force of the compression spring 243, the positioning post 24 can automatically insert and lock when the through slot 233 corresponds to the insertion hole 231, making operation convenient. The pull plate 241 allows for manual pulling of the positioning post 24 to release the lock, while the baffle 242 provides a force point for the compression spring 243, ensuring the stable and reliable automatic locking and manual unlocking functions of the positioning component.

[0029] Example 3: The difference between this example and the above examples is as follows: Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, a push rod 32 is inserted into the side wall of the piston rod 211. One end of the push rod 32 is rotatably connected to the locking plate 311, and the other end of the push rod 32 has an inclined surface 321. The diameter of the push rod 32 is adapted to the size of the connecting groove 322 on the side wall of the insertion plate 23, and the connecting groove 322 communicates with the insertion hole 231. The push rod 32 connects the locking plate 311 and the insertion plate 23. Its movement can drive the locking plate 311 to rotate, thereby unlocking the locking component. The cooperation of the inclined surface 321 and the connecting groove 322 ensures that the push rod 32 can accurately align with the insertion plate 23, providing a convenient transmission structure for the reset of the locking component.

[0030] like Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, in a specific embodiment, a reset cover 43 is installed on the side wall of the piston rod 211. The reset cover 43 movably passes through the push rod 32. A reset plate 431 is slidably disposed inside the reset cover 43, and the reset plate 431 is connected to the side wall of the push rod 32. A reset spring 432 is sleeved on the push rod 32. One end of the reset spring 432 is engaged with the side wall of the reset cover 43, and the other end is engaged with the reset plate 431. The reset cover 43 provides guidance and protection for the movement of the push rod 32. The cooperation of the reset plate 431 and the reset spring 432 can assist the push rod 32 in resetting when it is not subjected to external force, ensuring that the push rod 32 is always in a working state, which facilitates the subsequent locking operation of the locking assembly.

[0031] The implementation principle of the anti-roofing device for dismantling foundation pit supports according to the present invention is as follows: During the removal of the support beam 13, the implementation principle of the anti-top device is as follows: When it is necessary to provide anti-top support for the foundation pit enclosure 1, the anti-top component 2 is first installed in place, and the hydraulic cylinder 21 is fixed to the fixed protrusion 121 of the floor slab 12 by bolts. Its outer shell moves through the through hole 112 of the basement wall panel 11 to ensure that the piston rod 211 can be accurately aligned with the foundation pit enclosure 1. After the hydraulic cylinder 21 is activated, the piston rod 211 extends outward, and its end gradually approaches the pit enclosure 1. When the pressure rod 221 at the end of the piston rod 211 contacts the pit enclosure 1, the pressure rod 221 is squeezed and retracts. The retracted pressure rod 221 drives the pressure plate 222 connected to it to move. The rocker arm 223 on the back of the pressure plate 222 rotates accordingly. Since the rocker arm 223 is in an inclined state, the slider 224 at its end slides in the limiting groove 227, thereby driving the expansion plate 22 to move outward, increasing the contact area with the pit enclosure 1, so that the counter-jacking force is applied more evenly to the pit enclosure 1, and avoiding excessive local force that could damage the enclosure.

[0032] Furthermore, when the pressure plate 222 moves, it drives the insertion plate 23 to move, and the insertion plate 23 slides between a pair of guide plates 232. As the insertion plate 23 moves, when the insertion hole 231 on the insertion plate 23 corresponds to the through groove 233 on the guide plate 232, the positioning post 24 in the positioning assembly automatically inserts into the through groove 233 and the insertion hole 231 under the elastic force of the compression spring 243, locking the position of the insertion plate 23, thereby fixing the state of the pressure plate 222 and the expansion plate 22, ensuring that the expansion plate 22 maintains the increased contact area and continuously and stably applies a counter-pushing force to the pit enclosure 1, and at this time, the insertion hole 231 and the connecting groove 322 on the insertion plate 23 are on the same straight line as the push rod 32.

[0033] During the extension of the piston rod 211, the locking assembly functions synchronously. The clamping plate 311, which is rotatably mounted on the piston rod 211, is in an inclined state, with its end inclinedly overlapping the locking groove 31 of the locking plate 3. Therefore, when the piston rod 211 moves towards the pit enclosure 1, the clamping plate 311 can slide on the locking groove 31 without producing a locking effect, ensuring that the piston rod 211 can extend smoothly.

[0034] When the hydraulic cylinder 21 experiences a loss of pressure during operation, the pit enclosure 1 exerts a reverse force on the piston rod 211, causing the piston rod 211 to tend to move in the opposite direction (retract). At this time, because the clamping plate 311 is in an inclined state, its end will fit tightly against the side wall of the locking groove 31, restricting the reverse rotation of the clamping plate 311. The clamping plate 311 is firmly locked in the locking groove 31, thereby preventing the piston rod 211 from retracting, realizing the locking function, and ensuring the stability of the reverse jacking operation during the dismantling of the support beam 13.

[0035] Next, the support beam 13 was disassembled.

[0036] After the above operations are completed, the operator needs to reset the locking component and the anti-top component 2. Since the positioning pin 24 is inserted into the socket 231 during the above process, and the push rod 32 and the connecting groove 322 are on the same straight line at this time, the retraction path of the push rod 32 is blocked by the positioning pin 24 in the socket 231, so the positioning pin 24 needs to be unlocked.

[0037] The operator can pull the pull plate 241, which will move the positioning post 24 upward, causing the positioning post 24 to gradually disengage from the through groove 233 and the insertion hole 231. During this process, the baffle 242 on the positioning post 24 will compress the compression spring 243. When the positioning post 24 is completely disengaged from the insertion hole 231, the retraction path of the push rod 32 is no longer blocked. Therefore, the push rod 32 can move the locking plate 311. At this time, the locking plate 311 can move in the direction where the cross-sectional area of ​​the locking groove 31 gradually increases, and finally separate from the locking groove 31.

[0038] At this point, due to the loss of pressure in the hydraulic cylinder, the locking assembly is under significant pressure, causing the locking plate 311 to be tightly engaged with the locking groove 31, resulting in extremely high pressure at the connection point, making direct operation difficult to reset. However, by pushing the push rod 32 to move the locking plate 311, the locking plate 311 moves in a direction where the cross-sectional area of ​​the locking groove 31 gradually increases. As the space in the locking groove 31 gradually becomes more spacious, the pressure between the locking plate 311 and the locking groove 31 is gradually released, and the originally tight engagement is slowly released. This avoids damage to components caused by forced reset, allowing the operator to release the lock more easily and safely, and solving the problem of inconvenient disassembly caused by excessive pressure.

[0039] After the locking assembly is unlocked, the hydraulic cylinder 21 is activated to retract the piston rod 211. The piston rod 211 drives the anti-top assembly 2 to reset as a whole, returning it to the initial installation position.

Claims

1. A top-supporting device for removing foundation pit supports, comprising a foundation pit enclosure panel (1) arranged around the foundation pit, a basement wall panel (11) arranged inside the foundation pit enclosure panel (1), and a floor slab (12) installed on the basement wall panel (11), and a support beam (13) also installed on the basement wall panel (11), characterized in that: An anti-top component (2) is provided between the foundation pit enclosure slab (1) and the floor slab (12); The anti-top assembly (2) includes a hydraulic cylinder (21) installed on the floor slab (12) and a piston rod (211) inserted inside it. The end of the piston rod (211) corresponds to the pit enclosure plate (1). The end of the piston rod (211) is equipped with a pressure rod (221) that retracts when squeezed. The retracted pressure rod (221) causes the expansion plate (22) slidably connected to the end of the piston rod (211) to move outward, thereby increasing the contact area. A locking assembly is installed between the piston rod (211) and the floor slab (12). The locking assembly includes a locking plate (3) installed on the floor slab (12). A locking groove (31) is provided on the locking plate (3). The cross-sectional area of ​​the locking groove (31) on the side away from the piston rod (211) is smaller than the cross-sectional area of ​​the other end. A clamping plate (311) is rotatably installed on the piston rod (211) in an inclined state, and the end of the clamping plate (311) is inclinedly overlapped on the locking groove (31).

2. The anti-roofing device for dismantling foundation pit supports according to claim 1, characterized in that, The vertical distance between each position of the basement wall panel (11) and the foundation pit enclosure panel (1) is equal. Columns (111) are installed at the four corners of the basement wall panel (11), and the columns (111) are integrally cast with the foundation pit foundation.

3. The anti-roofing device for dismantling foundation pit supports according to claim 1, characterized in that, The floor slab (12) is provided with a fixed protrusion (121), which is a right trapezoid. The fixed protrusion (121) and the floor slab (12) are integrally cast, and a steel bar is provided between the floor slab (12) and the fixed protrusion (121), and the steel bar is L-shaped.

4. The anti-roofing device for dismantling foundation pit supports according to claim 1, characterized in that, The outer shell of the hydraulic cylinder (21) is mounted on the end face of the fixed protrusion (121) by bolts. A through hole (112) is provided on the basement wall panel (11). The outer shell of the hydraulic cylinder (21) moves through the through hole (112).

5. The anti-roofing device for dismantling foundation pit supports according to claim 1, characterized in that, The piston rod (211) is hollow inside. A reinforcing rod (212) is installed on the inner cavity of the piston rod (211) to improve the structural strength of the piston rod (211). A pressure plate (222) is inserted into the piston rod (211). The pressure plate (222) is movably inserted into the reinforcing rod (212). The center of the pressure plate (222) is movably connected to the pressure rod (221). A rocker arm (223) is movably installed on the back of the pressure plate (222). The rocker arm (223) is in an inclined state. A slider (224) is movably installed at the end of the rocker arm (223). The slider (224) is connected to the side wall of the expansion plate (22).

6. The anti-roofing device for dismantling foundation pit supports according to claim 5, characterized in that, The piston rod (211) has a limiting groove (227) at its end, and the limiting groove (227) is movably connected to the slider (224). The slider (224) and the expansion plate (22) are L-shaped. A limiting rod (225) is installed through the slider (224). The top of the limiting rod (225) is installed on the inner wall of the piston rod (211). A limiting spring (226) is sleeved on the limiting rod (225). One end of the limiting spring (226) is engaged with the inner wall of the piston rod (211), and the other end of the limiting spring (226) is engaged with the side wall of the slider (224).

7. The anti-roofing device for dismantling foundation pit supports according to claim 5, characterized in that, The pressure plate (222) has a insert plate (23) installed on its side wall. The piston rod (211) has a pair of guide plates (232) installed on its other end. The insert plate (23) is movably inserted between the pair of guide plates (232). The insert plate (23) has a socket (231). The pair of guide plates (232) have a through groove (233). The through groove (233) is compatible with the socket (231). The piston rod (211) has a positioning component installed on it. The positioning component is used to automatically insert and lock when the through groove (233) and the socket (231) correspond.

8. A jacking device for dismantling foundation pit supports according to claim 7, characterized in that, The positioning assembly includes a positioning post (24), which is compatible with the through groove (233) and the insertion hole (231). The positioning post (24) is movably connected to the piston rod (211). A pull plate (241) is installed on the top of the positioning post (24). A baffle (242) is installed on the side wall of the positioning post (24). A compression spring (243) is sleeved on the positioning post (24) located on the inner wall of the piston rod (211). One end of the compression spring (243) is engaged with the inner wall of the piston rod (211), and the other end of the compression spring (243) is engaged with the baffle (242).

9. A jacking device for dismantling foundation pit supports according to claim 7, characterized in that, A push rod (32) is inserted into the side wall of the piston rod (211). One end of the push rod (32) is rotatably connected to the card plate (311), and the other end of the push rod (32) has an inclined surface (321). The diameter of the push rod (32) is adapted to the size of the connecting groove (322) opened on the side wall of the insert plate (23), and the connecting groove (322) is connected to the insertion hole (231).

10. A jacking device for dismantling foundation pit supports according to claim 9, characterized in that, A reset cover (43) is installed on the side wall of the piston rod (211). The reset cover (43) and the push rod (32) are movably connected through each other. A reset plate (431) is slidably arranged inside the reset cover (43), and the reset plate (431) is connected to the side wall of the push rod (32). A reset spring (432) is sleeved on the push rod (32). One end of the reset spring (432) is engaged with the side wall of the reset cover (43), and the other end is engaged with the reset plate (431).

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