Building jacking method and through-type self-clamping jack

Abstract

The application relates to the field of building jacking, in particular to a building jacking method and a self-clamping through-type jack, wherein the method comprises the following steps: excavating the foundation of a building to be jacked; arranging anchor rods and tray beams on the two sides of a foundation wall, and arranging a supporting beam between the tray beams; sleeving a self-clamping through-type jack with a cylinder part and an extension part on the anchor rods; connecting a lifting steel frame with the tray beams, and arranging the self-clamping through-type jack between the tray beams and the lifting steel frame; when the cylinder part is engaged with the anchor rod, the extension part can move along the anchor rod, and when the extension part is engaged with the anchor rod, the cylinder part can move along the anchor rod. The bottom of the cylinder part and the top of the extension part of the self-clamping through-type jack are both provided with a hydraulic engagement assembly, the hydraulic engagement assembly comprises an engagement claw and a claw driving unit, and the claw driving unit can drive the engagement claw to approach or move away from the meshing tooth structure. The application has the advantages that the basement construction of an existing building can be conveniently carried out in a narrow space.

Description

Technical Field

[0001] This application belongs to the field of building jacking, and in particular relates to a building jacking method. In addition, it also relates to a through-hole self-locking jack. Background Technology

[0002] As society develops, some buildings that need to be preserved can no longer meet current practical needs. Therefore, it is necessary to reasonably expand and renovate these buildings. Generally, basements are added under these buildings to house related equipment, etc.

[0003] If a basement needs to be added under an existing building, the usual method is to move the building to make room. However, for some buildings in old urban areas, there is not enough space to move them, so the jacking method is usually used to obtain enough construction space.

[0004] Existing lifting solutions typically require multiple sets of hydraulic lifting units, each containing multiple hydraulic cylinders. These cylinders are divided into master and slave groups. After the master hydraulic cylinder reaches its lifting position, the slave cylinders of the other group follow up to maintain the building at its current height. The master hydraulic cylinder then retracts, and pads are placed under it. The lifting operation continues with the master hydraulic cylinder, while the slave cylinder retracts and pads are placed at its bottom. This process continues until the master hydraulic cylinder reaches its lifting position, at which point the slave cylinders follow up to maintain the building at its current height. This process is repeated until the building is lifted to the set height. This method involves numerous hydraulic devices, is complex, and the stacked pads have poor overall integrity and stability, making the building prone to tipping over after lifting.

[0005] Therefore, a building lifting method is needed. Summary of the Invention

[0006] To overcome the aforementioned deficiencies, this application provides a building lifting method.

[0007] The building jacking method provided in this application adopts the following technical solution.

[0008] A building jacking method includes the following steps:

[0009] Earthwork excavation: excavating the foundation of the building to be lifted;

[0010] Anchor bolts are driven in: Anchor bolts are symmetrically installed on both sides of the wall of the foundation;

[0011] Pallet beams: Pallet beams are provided along both sides of the wall of the foundation, and a supporting beam is provided between the pallet beams on both sides of the wall to abut against the wall via the supporting beam;

[0012] Install a lifting device: Install a through-hole self-locking jack on the anchor rod. The through-hole self-locking jack includes a cylinder part and a telescopic part, and both the cylinder part and the telescopic part can engage with the anchor rod.

[0013] Install the lifting steel frame: Connect the lifting steel frame to the pallet beam, and place the through-type self-locking jack between the pallet beam and the lifting steel frame, and be able to abut against the lifting steel frame;

[0014] Lifting operation: When the cylinder part engages with the anchor rod, the telescopic part does not engage with the anchor rod and can move up and down along the anchor rod; when the telescopic part engages with the anchor rod, the cylinder part does not engage with the anchor rod and can move up and down along the anchor rod.

[0015] By adopting the above technical solution, the pallet beam has good overall integrity. Using the pallet beam to support the foundation of the building to be lifted, even if there is some uneven lifting, it is not easy for the building to collapse locally. Furthermore, it allows for the installation of anchor rods along both the inner and outer sides of the walls. Since the anchor rods are the basic support components for lifting, more support components can be installed, resulting in less force required on each anchor rod and higher safety. When the cylinder of the through-type self-locking jack engages with the anchor rod, its telescopic part can extend (i.e., move upwards along the anchor rod), thereby moving the lifting steel frame upwards. The lifting steel frame then pulls the pallet beam and the entire building upwards. After moving the telescopic part to the correct position (e.g., when the telescopic part reaches its maximum extension stroke), engage the telescopic part with the anchor rod. Then, release the cylinder part from the anchor rod and move the cylinder part upwards until it reaches the appropriate position. Finally, engage the cylinder part with the anchor rod again and release the telescopic part from the anchor rod. This allows the structure to be gradually lifted in a step-by-step manner, supported by the anchor rod, following the steps described above. During the lifting process, there is no need to place pads or use stacked pads with poor stability as support. Moreover, the integrity and stability of the anchor rod are far greater than those of stacked pads. Therefore, using the anchor rod as the basic support for lifting is more stable and less prone to overturning after lifting.

[0016] Specifically, the length of the underground section of the anchor rod is greater than the height of the underground structure to be added to the building to be lifted. The above-ground section of the anchor rod is provided with a rod engagement tooth assembly extending along the length of the anchor rod. The cylinder part and the telescopic part can cooperate with the rod engagement tooth assembly to engage with the anchor rod. The above-ground section and the underground section of the anchor rod are detachably connected.

[0017] By adopting the above-mentioned technical solution, it can be ensured that the jacked building remains stable and does not overturn when further downward excavation work is carried out; and by setting the above-ground section of the anchor rod to be detachably connected to the underground section, it is easy to remove the part of the anchor rod protruding from the ground after the construction of the expansion is completed and the building to be jacked is lowered to the top of the expansion.

[0018] Furthermore, the two anchor bolts form a lifting rod group, and the distance between two adjacent lifting rod groups is greater than or equal to 1.6m.

[0019] By adopting the above technical solution, it is easier for construction equipment to enter the area below the building to be lifted for construction work.

[0020] Furthermore, after the building to be lifted is lifted to a set height, support piles are constructed below the building to be lifted so that the building to be lifted can be supported by the support piles after the support piles are constructed, and the above-ground section of the anchor rod is removed.

[0021] By adopting the above technical solution, and using support piles with higher support capacity to support the building to be lifted instead of anchor rods, all anchor rods around the building to be lifted can be removed, and the spacing between each support pile is also relatively larger, which facilitates the entry of construction equipment for construction.

[0022] This application also provides a through-hole self-locking jack, which adopts the following technical solution.

[0023] A self-engaging jack with a through-hole design, as described in the above-mentioned technical solution, includes a cylinder body and a telescopic part. The bottom of the cylinder body and the top of the telescopic part are each provided with a hydraulic engagement assembly capable of engaging with an anchor rod. The anchor rod is the type described in the above-mentioned technical solution. The hydraulic engagement assembly includes engagement claws and a claw drive unit. The outer wall of the above-ground section of the anchor rod is provided with a set of rod-shaped meshing teeth extending along the length of the anchor rod. The claw drive unit can drive the engagement claws to move closer to or further away from the set of rod-shaped meshing teeth.

[0024] By adopting the above technical solution, the cylinder body and telescopic part can be engaged with the anchor rod. Thus, during the jacking process, only the anchor rod with higher integrity and better stability is needed as support. This enables stable and efficient step-by-step jacking operation of the building to be jacked, and ensures that there is no risk of overturning after jacking.

[0025] Furthermore, the hydraulic engagement assembly also includes an engagement member housing, which includes an annular pressure-bearing outer wall and a rod-passing hole formed in the middle of the annular pressure-bearing outer wall, suitable for the anchor rod to pass through. The annular pressure-bearing outer wall is also provided with a plurality of claw receiving cavities arranged circumferentially along the annular pressure-bearing outer wall. The engagement claws and the claw driving unit are both placed in the claw receiving cavities.

[0026] By adopting the above technical solution, the interlocking ability between the hydraulic interlocking component and the anchor rod can be improved, and the contact area between the two after the hydraulic interlocking component and the anchor rod are interlocked can be increased, so as to ensure the reliability of the interlocking and prevent unstable interlocking, which could lead to building collapse or even falling.

[0027] Specifically, the biting jaw includes a jaw base plate and a jaw meshing tooth assembly. The jaw meshing tooth assembly is disposed on the side of the jaw base plate facing the through hole. Each jaw meshing tooth in the jaw meshing tooth assembly includes a jaw meshing tooth inclined surface and a jaw meshing tooth plane, and the jaw meshing tooth inclined surface of each jaw meshing tooth is located above the jaw meshing tooth plane.

[0028] By adopting the above technical solution, the jaw meshing tooth plane can serve as a support surface to prevent the hydraulic biting components and even the entire building from falling, thereby ensuring the stability of the support.

[0029] Specifically, each link meshing tooth in the link meshing tooth group includes a link meshing tooth inclined surface and a link meshing tooth plane, and the link meshing tooth inclined surface of each link meshing tooth is located below the link meshing tooth plane.

[0030] By adopting the above technical solution, the meshing tooth plane of the rod can serve as a support surface to prevent the hydraulic meshing components and even the entire building from falling, thereby ensuring the stability of the support.

[0031] Specifically, the chuck drive unit includes a return spring and a hydraulic cylinder. The return spring is provided at both ends of the chuck base plate and between the chuck receiving cavity and the side wall near the rod hole. One end of the hydraulic cylinder is connected to the side wall of the chuck receiving cavity away from the rod hole, and the other end is connected to the chuck base plate. A slot structure is provided on the side wall of the chuck receiving cavity near the rod hole for the chuck meshing teeth to pass through.

[0032] By adopting the above technical solution, when it is necessary to engage the hydraulic engagement component with the anchor rod, the hydraulic cylinder can press the engagement claws against the anchor rod, thereby achieving engagement between the claw engagement teeth and the rod engagement teeth to prevent the building from falling. Furthermore, the spring can push the engagement claws away from the anchor rod, facilitating the depressurization of the hydraulic cylinder and disengaging the claw engagement teeth from the rod engagement teeth. This allows for the movement of the cylinder body and the telescopic part, thereby enabling the lifting or lowering operation of the building to be lifted.

[0033] Specifically, both the cylinder body and the telescopic part are formed as sleeve structures so that they can be fitted onto the anchor rod; the bottom of the telescopic part is provided with an annular piston, and the cylinder body is formed with a hydraulic chamber suitable for accommodating the piston. The piston divides the hydraulic chamber into a contraction chamber near the top of the telescopic part and a lifting chamber near the bottom of the cylinder body, and both the contraction chamber and the lifting chamber are provided with an oil inlet pipe and an oil outlet pipe.

[0034] By adopting the above technical solution, the cylinder body and telescopic part can be moved, thereby enabling the lifting operation.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. The pallet beam has good integrity. It supports the foundation of the building to be lifted. Even if there is some uneven lifting, it is not easy for the building to collapse locally. It can also install anchors along the inner and outer sides of the wall. Since the anchors are the basic support components for lifting, more support components can be set for lifting, which reduces the load required on each anchor and increases safety.

[0037] 2. When the cylinder of the self-locking jack engages with the anchor rod, its telescopic part can extend (i.e., move upward along the anchor rod), thereby raising the lifting steel frame. The lifting steel frame then pulls the pallet beam and the entire building upward. After reaching the desired position (e.g., the telescopic part reaches its maximum extension stroke), the telescopic part engages with the anchor rod again. Then, the cylinder is released from the anchor rod, and the cylinder is moved upward until it reaches the appropriate position. Finally, the cylinder is engaged with the anchor rod again, and the telescopic part is released from the anchor rod. This allows the building to be gradually raised step by step, supported by the anchor rod, following the above steps. The operation is simple and the jacking efficiency is high.

[0038] 3. No pads are needed during the lifting process, and there is no need to use stacked pads with poor stability as support. Moreover, the integrity and stability of the anchor rod are much greater than that of stacked pads. Therefore, using the anchor rod as the basic support for jacking is more stable and less likely to cause overturning after jacking. Attached Figure Description

[0039] Figure 1 This is a three-dimensional schematic diagram of the construction state of a building lifting method according to this application.

[0040] Figure 2 This is a top view schematic diagram of the construction state of one of the building lifting methods of this application.

[0041] Figure 3 yes Figure 2 A partially enlarged sectional view along the AA direction.

[0042] Figure 4 yes Figure 3 Cross-sectional view along the BB direction.

[0043] Figure 5 yes Figure 3 A magnified view of region C in the middle.

[0044] Figure 6 yes Figure 5 A magnified view of region D in the middle.

[0045] Reference numerals: 1. Wall; 2. Anchor bolt; 21. Engaging gear assembly; 3. Pallet beam; 31. Support beam; 4. Through-type self-engaging jack; 1. Cylinder body; 4. 411. Contraction chamber; 412. Lifting chamber; 42. Telescopic part; 421. Piston; 43. Hydraulic engagement assembly; 431. Engaging claw; 4311. Claw base plate; 4312. Claw engagement gear assembly; 4321. Return spring; 4322. Hydraulic cylinder; 433. Annular pressure-bearing outer wall; 5. Lifting steel frame; 6. Support pile. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0047] This application discloses a building lifting method.

[0048] Reference Figure 1 and Figure 2 A building jacking method, comprising the following steps:

[0049] Earthwork excavation: excavating the foundation of the building to be lifted.

[0050] Anchor bolts 2 are driven in: Anchor bolts 2 are symmetrically installed on both sides of the wall 1 of the excavated foundation. It is important to note that the length of the underground section of the anchor bolt 2 should be greater than the height of the underground structure to be added to the building to be lifted. For example, if a basement with a height of 3 meters needs to be added, the length of the underground section of the anchor bolt 2 can be set to 7 meters to ensure that after the excavation of space for basement construction, the anchor bolt 2 can still provide good anchoring support, reducing the possibility of the building to be lifted overturning. Furthermore, a set of meshing teeth 21 extending along the length of the anchor bolt 2 is provided on the above-ground section of the anchor bolt 2. Additionally, if... Figure 3 As shown, during the driving of anchor bolts 2, two anchor bolts 2 can be combined to form a jacking rod group, and the distance between two adjacent jacking rod groups can be set to be greater than or equal to 1.6m, so that at least a mini excavator can pass between the two jacking rod groups to enter the site for operation. Of course, it is also understandable that after the building to be jacked is jacked to a set height, multiple support piles 6 can be constructed below the building to be jacked. After the support piles 6 are constructed, the building to be jacked can be lowered, and the building to be jacked can be supported by the support piles 6. The above-ground section of the anchor bolt 2 can be removed. After the support piles 6 with higher support capacity replace the anchor bolt 2 to support the building to be jacked, the anchor bolts 2 around the building to be jacked can be partially or completely removed, and the distance between each support pile 6 is also relatively larger, so as to facilitate the entry of construction equipment for construction. Accordingly, the above-ground section and the underground section of the anchor bolt 2 can also be set as detachable connection, so that after the construction of the addition is completed and the building to be jacked is lowered to the top of the addition, it is easy to remove the part of the anchor bolt 2 that protrudes from the ground.

[0051] Pallet beam 3: Pallet beams 3 are installed along both sides of the wall 1 of the foundation. It should be noted that pallet beam 3 should be a reinforced concrete beam, and as... Figure 2 and Figure 4 As shown, before setting up the pallet beam 3, holes need to be made at the bottom of the wall 1 of the foundation so that a support beam 31 can be set between the pallet beams 3 on the inner and outer sides of the wall 1. The support beam 31 can abut against the wall 1, providing support for the wall 1 and the entire building to be lifted. Holes need to be set on the pallet beam 3 to facilitate the passage of anchor rods 2, so that the pallet beam 3 can move upward along the anchor rods 2 during subsequent lifting operations. The pallet beam 3 designed above has good integrity. By using the pallet beam 3 to support the foundation of the building to be lifted, even if there is a certain degree of uneven lifting, it is not easy for the building to collapse locally. It can also set up anchor rods 2 on the inner and outer sides of the wall 1. Since the anchor rods 2 are the basic support components for lifting, more lifting support components can be set up, so that the load required on each anchor rod 2 is smaller and the safety is higher.

[0052] Install the jacking device: Install a through-type self-locking jack 4 on the anchor bolt 2, such as... Figure 5 As shown, the self-engaging jack 4 includes a cylinder body 41 and a telescopic part 42. Both the cylinder body 41 and the telescopic part 42 can engage with the anchor rod 2 through the cooperation between them and the meshing tooth group 21 of the rod. Specifically, the self-engaging jack 4 is configured such that when the cylinder body 41 engages with the anchor rod 2, the telescopic part 42 does not engage with the anchor rod 2 and can move up and down along the anchor rod 2; when the telescopic part 42 engages with the anchor rod 2, the cylinder body 41 does not engage with the anchor rod 2 and can move up and down along the anchor rod 2.

[0053] Install lifting steel frame 5: as follows Figure 3 and Figure 5 As shown, the lifting steel frame 5 is connected to the pallet beam 3. The lifting steel frame 5 specifically includes a crossbeam and longitudinal beams at both ends of the crossbeam. One end of the longitudinal beam is connected to the crossbeam, and the other end is connected to the pallet beam 3. A hole structure is required on the crossbeam to facilitate the passage of the anchor rod 2, so that the lifting steel frame 5 can move up and down along the anchor rod 2. The through-type self-locking jack 4 is located between the pallet beam 3 and the crossbeam of the lifting steel frame 5, and can abut against the crossbeam of the lifting steel frame 5. When the telescopic part 42 of the through-type self-locking jack 4 pushes the lifting steel frame 5 to move upward, the lifting steel frame 5 can pull the pallet beam 3 and the entire building to be lifted to move upward to achieve lifting.

[0054] Lifting Operation: During jacking, first engage the cylinder body 41 of the self-locking jack 4 with the anchor rod 2, allowing its telescopic part 42 to extend (i.e., move upward along the anchor rod 2). This allows the lifting steel frame 5 to move upward, pulling the pallet beam 3 and the entire building upward. After reaching the desired position (e.g., the telescopic part 42 reaches its maximum extension stroke), engage the telescopic part 42 with the anchor rod 2 again. Then, release the cylinder body 41 from the anchor rod 2 (unlock the engagement) and move the cylinder body 41 upward until it reaches the appropriate position. Finally, engage the cylinder body 41 with the anchor rod 2 again, locking the engagement. Then, release the telescopic part 42 from the anchor rod 2, allowing the building to continue following the above steps, using the anchor rod 2 as support and... The structure is gradually raised in a step-by-step manner. During descent, the telescopic part 42 of the self-locking jack 4 is first engaged with the anchor rod 2, and the engagement of its cylinder part 41 with the anchor rod 2 is released, allowing the cylinder part 41 to move downward along the anchor rod 2. After the cylinder part 41 moves into position, it is engaged with the anchor rod 2. After the engagement is locked, the telescopic part 42 is released from the anchor rod 2, allowing the telescopic part 42 to move downward. This allows the lifting steel frame 5 to lower the pallet beam 3 and the entire building. After lowering to a set position (e.g., the telescopic part 42 reaches its maximum retraction stroke), the telescopic part 42 is engaged with the anchor rod 2 again. Then, the above steps are continued to lower the building gradually in a step-by-step manner, using the anchor rod 2 as support.

[0055] This application also discloses a through-hole self-locking jack.

[0056] Reference Figure 5 and Figure 6 A self-locking jack with a through-hole design, specifically the self-locking jack 4 described in the above-mentioned technical solution, includes a cylinder body 41 and a telescopic part 42. Specifically, both the cylinder body 41 and the telescopic part 42 are formed as sleeve structures to be fitted onto the anchor rod 2. An annular piston 421 is provided at the bottom of the telescopic part 42, and a hydraulic chamber suitable for accommodating the piston 421 is formed in the cylinder body 41. The piston 421 is placed in the hydraulic chamber and can divide the hydraulic chamber into a contraction chamber 4 near the top of the telescopic part 42. 11 and a lifting chamber 412 near the bottom of the cylinder body 41, and both the contraction chamber 411 and the lifting chamber 412 are connected to their respective oil inlet pipes (not shown in the figure) and oil outlet pipes (not shown in the figure), so that when oil is injected into the lifting chamber 412 and oil is discharged into the contraction chamber 411, the contraction chamber 411 can move upward (or the cylinder body 41 can move downward), and when oil is injected into the contraction chamber 411 and oil is discharged into the lifting chamber 412, the lifting chamber 412 can move upward (or the cylinder body 41 can move downward).

[0057] Furthermore, referring to Figure 5 and Figure 6 Hydraulic engagement components 43 capable of engaging with anchor rod 2 are provided at the bottom of cylinder body 41 and the top of telescopic part 42. Anchor rod 2 is the anchor rod 2 in the above-mentioned technical solution. The hydraulic engagement component 43 includes engagement claw 431 and claw drive unit. The outer wall of the above-ground section of anchor rod 2 is provided with rod meshing tooth group 21 extending along the length direction of anchor rod 2. The claw drive unit can drive engagement claw 431 to approach or move away from rod meshing tooth group 21 so that when engagement claw 431 approaches and abuts against rod meshing tooth group 21, engagement between hydraulic engagement component 43 and anchor rod 2 can be achieved. Thus, during the lifting process, only anchor rod 2 with higher integrity and better stability is needed as support, without the need for pad blocks with poor integrity and stability as support for the building to be lifted. This enables stable and efficient step-by-step lifting operation of the building to be lifted, and ensures that there is no risk of overturning after lifting.

[0058] Specifically, refer to Figure 6In one embodiment of the self-engaging jack of the through-hole type in this application, the hydraulic engagement assembly 43 further includes an engagement member housing, wherein the engagement member housing includes an annular pressure-bearing outer wall 433 and a rod-through hole formed in the middle of the annular pressure-bearing outer wall 433 suitable for the anchor rod 2 to pass through. A plurality of claw receiving cavities arranged circumferentially along the annular pressure-bearing outer wall 433 are also provided in the annular pressure-bearing outer wall 433, for example, four are provided. Each claw receiving cavity is provided with a set of engagement claws 431 and a claw driving unit. Furthermore, based on the above structural design, the outer wall of the above-ground section of the anchor rod 2 is provided with four sets of rod meshing teeth 21 extending along the length of the anchor rod 2, and multiple sets of biting claws 431 and claw drive units are provided. This can improve the biting ability between the hydraulic biting component 43 and the anchor rod 2, and increase the contact area between the hydraulic biting component 43 and the anchor rod 2 after they are biting together, so as to ensure the reliability of the biting and prevent unstable biting that could lead to building collapse or even falling.

[0059] Specifically, refer to Figure 6 In one embodiment of the through-hole self-engaging jack of this application, the engaging jaw 431 includes a jaw base plate 4311 and a jaw engagement tooth assembly 4312. The jaw engagement tooth assembly 4312 is disposed on the side of the jaw base plate 4311 facing the through-hole. Each jaw engagement tooth in the jaw engagement tooth assembly 4312 includes a jaw engagement tooth inclined surface and a jaw engagement tooth plane, and the jaw engagement tooth inclined surface in each jaw engagement tooth is located above the jaw engagement tooth plane. Correspondingly, each rod engagement tooth in the rod engagement tooth assembly 21 includes a rod engagement tooth inclined surface and a rod engagement tooth plane, and the rod engagement teeth in each rod engagement tooth are... The inclined surface of the tooth is located below the meshing tooth plane of the rod, allowing the meshing tooth plane of the pawl and the meshing tooth plane of the rod to abut against each other. This serves as a support surface to prevent the hydraulic engagement assembly 43 and even the entire building from falling, thus ensuring the stability of the support. It is important to note that the meshing teeth of each rod and each pawl are of the same size, so that multiple pawl meshing tooth planes and rod meshing tooth planes can simultaneously share the load. This reduces the load on each rod meshing tooth and pawl meshing tooth, thereby reducing the possibility of tooth breakage that could lead to the building overturning or falling.

[0060] Furthermore, referring to Figure 6In one embodiment of the through-hole self-engaging jack of this application, the chuck drive unit includes a return spring 4321 and a hydraulic cylinder 4322. Return springs 4321 are provided at both ends of the chuck base plate 4311 and between them and the sidewalls of the chuck receiving cavity near the through-hole. One end of the hydraulic cylinder 4322 is connected to the sidewall of the chuck receiving cavity away from the through-hole, and the other end is connected to the chuck base plate 4311. A slot structure is provided on the sidewall of the chuck receiving cavity near the through-hole for the chuck engagement teeth 4312 to pass through, thereby enabling hydraulic engagement when necessary. When component 43 engages with anchor rod 2, hydraulic cylinder 4322 can press the engagement claw 431 against anchor rod 2, realizing the engagement between claw engagement tooth group 4312 and rod engagement tooth group 21, so as to prevent the building from falling. Spring can push the engagement claw 431 away from anchor rod 2, thereby facilitating the depressurization of hydraulic cylinder 4322. At the same time, the engagement between claw engagement tooth group 4312 and rod engagement tooth group 21 is disengaged, so as to facilitate the movement of cylinder body 41 and telescopic part 42, thereby realizing the lifting or lowering operation of the building to be lifted.

[0061] The implementation principle of the self-engaging jack in this application embodiment is as follows: the hydraulic cylinder 4322 pushes the engagement claw 431 towards the anchor rod 2 to achieve engagement between the telescopic part 42 or the cylinder part 41 of the self-engaging jack 4 and the anchor rod 2, and the return spring 4321 pushes the engagement claw 431 away from the anchor rod 2 to achieve disengagement between the telescopic part 42 or the cylinder part 41 of the self-engaging jack 4 and the anchor rod 2, thereby enabling the telescopic part 42 or the cylinder part 41 to move up and down along the anchor rod 2.

[0062] Then, the cylinder body 41 can be engaged with the anchor rod 2, and the telescopic part 42 can be extended (i.e., moved upward along the anchor rod 2), thereby moving the lifting steel frame 5 upward. The lifting steel frame 5 pulls the pallet beam 3 and the entire building upward. After moving to the position, the telescopic part 42 is engaged with the anchor rod 2. Then, the cylinder body 41 is released from the anchor rod 2, and the cylinder body 41 is moved upward until it reaches the appropriate position. Then, the cylinder body 41 is engaged with the anchor rod 2. After the engagement is locked, the telescopic part 42 is released from the anchor rod 2, thereby continuing to gradually raise the building according to the above steps.

[0063] It is also possible to first engage the telescopic part 42 with the anchor rod 2, and then release the engagement between the cylinder part 41 and the anchor rod 2, so that the cylinder part 41 can move downward along the anchor rod 2. After the cylinder part 41 moves into place, it engages with the anchor rod 2. After the engagement is locked, the telescopic part 42 is released from the anchor rod 2, so that the telescopic part 42 can move downward, allowing the lifting steel frame 5 to lower the pallet beam 3 and the entire building. After lowering to the set position (for example, the telescopic part 42 reaches its maximum retraction stroke), the telescopic part 42 is engaged with the anchor rod 2 again, and then the building is gradually lowered by following the above steps.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A building jacking method, characterized in that, Includes the following steps: Earthwork excavation: excavating the foundation of the building to be lifted; Anchor rods are driven in: Anchor rods (2) are symmetrically installed on both sides of the wall (1) of the foundation. The length of the underground section of the anchor rod (2) driven into the ground is greater than the height of the underground building to be added to the building to be lifted. The above-ground section of the anchor rod (2) is provided with a rod meshing tooth group (21) extending along the length direction of the anchor rod (2). Constructing pallet beams: Pallet beams (3) are provided on both sides of the wall (1) of the foundation, and a supporting beam (31) is provided between the pallet beams (3) on both sides of the wall (1) to abut against the wall (1) via the supporting beam (31). Install lifting device: A through-type self-engaging jack (4) is fitted on the anchor rod (2). The through-type self-engaging jack (4) includes a cylinder part (41) and a telescopic part (42). The cylinder part (41) and the telescopic part (42) can cooperate with the rod meshing tooth group (21) to engage with the anchor rod (2). The above-ground section and the underground section of the anchor rod (2) are detachably connected. The bottom of the cylinder part (41) and the top of the telescopic part (42) are provided with hydraulic engagement components (43) that can engage with the anchor rod (2). The hydraulic engagement component (43) includes a engagement claw (431) and a claw drive unit. The claw drive unit can drive the engagement claw (431) to move closer to or away from the rod meshing tooth group (21). The hydraulic engagement assembly (43) also includes an engagement member housing, which includes an annular pressure-bearing outer wall (433) and a through hole formed in the middle of the annular pressure-bearing outer wall (433) suitable for the anchor rod (2) to pass through. The annular pressure-bearing outer wall (433) is also provided with a plurality of claw receiving cavities arranged circumferentially along the annular pressure-bearing outer wall (433). The engagement claw (431) and the claw driving unit are both placed in the claw receiving cavity. The engagement claw (431) includes a claw base plate (4311) and a claw meshing tooth assembly (4312). The chuck drive unit includes a return spring (4321) and a hydraulic cylinder (4322). The return spring (4321) is provided at both ends of the chuck base plate (4311) and between the chuck receiving cavity and the side wall near the rod hole. One end of the hydraulic cylinder (4322) is connected to the side wall of the chuck receiving cavity away from the rod hole, and the other end is connected to the chuck base plate (4311). The side wall of the chuck receiving cavity near the rod hole is provided with a slot structure through which the chuck meshing teeth pass. Both the cylinder body (41) and the telescopic part (42) are formed as sleeve structures so that they can be sleeved on the anchor rod (2); the bottom of the telescopic part (42) is provided with an annular piston (421), and the cylinder body (41) is formed with a hydraulic chamber suitable for accommodating the piston (421). The piston (421) divides the hydraulic chamber into a contraction chamber (411) near the top of the telescopic part (42) and a lifting chamber (412) near the bottom of the cylinder body (41). Both the contraction chamber (411) and the lifting chamber (412) are provided with an oil inlet pipe and an oil outlet pipe. Install the lifting steel frame: connect the lifting steel frame (5) to the pallet beam (3), and the through-type self-locking jack (4) is located between the pallet beam (3) and the lifting steel frame (5), and can abut against the lifting steel frame (5); Lifting operation: When the cylinder part (41) engages with the anchor rod (2), the telescopic part (42) does not engage with the anchor rod (2) and can move up and down along the anchor rod (2); when the telescopic part (42) engages with the anchor rod (2), the cylinder part (41) does not engage with the anchor rod (2) and can move up and down along the anchor rod (2).

2. The building jacking method according to claim 1, characterized in that: The two anchor bolts (2) form a lifting rod group, and the distance between two adjacent lifting rod groups is greater than or equal to 1.6m.

3. The building jacking method according to claim 2, characterized in that: After the building to be lifted is lifted to a set height, a support pile (6) is constructed below the building to be lifted so that the building to be lifted can be supported by the support pile (6) after the support pile (6) is constructed, and the above-ground section of the anchor (2) is removed.

4. A building jacking method according to claim 1, characterized in that: The pawl engagement tooth assembly (4312) is disposed on the pawl base plate (4311) facing the through hole. Each pawl engagement tooth in the pawl engagement tooth assembly includes a pawl engagement tooth inclined surface and a pawl engagement tooth plane, and the pawl engagement tooth inclined surface of each pawl engagement tooth is located above the pawl engagement tooth plane.

5. A building jacking method according to claim 4, characterized in that: Each rod meshing tooth in the rod meshing tooth group (21) includes a rod meshing tooth inclined surface and a rod meshing tooth plane, and the rod meshing tooth inclined surface in each rod meshing tooth is located below the rod meshing tooth plane.

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