Building lifting and underpinning device and method

Abstract

The purpose of the present application is to provide a building jacking and underpinning device and method, including a pallet beam and a plurality of jacking and underpinning structures, wherein the pallet beam surrounds the bottom of the building foundation wall and is used to support the protective building; each jacking and underpinning structure includes an anchor static pressure pile, a jacking reaction beam, a jacking steel beam, a jacking steel column and a jack, wherein the jacking steel column and the jacking steel beam constitute a jacking frame, and the jacking reaction beam and the anchor static pressure pile constitute a reaction force support system. In the jacking stage, the jack pulls the jacking steel column through the jacking steel beam, and pulls the pallet beam to jack synchronously, while the jacking reaction beam provides reaction force support for the jack and transmits force to the anchor static pressure pile; in the stage of replacing the lower pad of the jack, the hydraulic jack and the follower jack replace the lower pad in turn; repeat the above operation until the building reaches the designed jacking height. The present device can realize the jacking and underpinning of the building above ±0.000, without damaging the facade of the building, and is safe and stable.

Description

Technical Field

[0001] The invention belongs to the technical field of building underpinning, and in particular relates to a building lifting and underpinning device and method. Background Art

[0002] In recent years, with the advancement of urban renewal construction such as urban planning transformation and urban renewal, protective buildings are often affected by the construction of deep foundation pits in the surrounding areas. In addition, the protective buildings’ own structures are old and weak, which makes them prone to varying degrees of damage such as uneven settlement and tilt.

[0003] In addition, during the renovation process, the lower space of the protective building still needs to be developed and utilized. Therefore, the planning and renovation of the protective building must not only meet the requirements of the upper bearing capacity, but also meet the requirements of the development and use of the underground space.

[0004] The overall building lifting technology can solve the above problems very well. This technology can not only protect the protective buildings in situ, but also develop the underground space after lifting them in situ according to planning requirements. It can also temporarily or permanently reinforce the protective buildings during the lifting construction process, so as to achieve the effect of "repairing the old as it is, and strengthening and extending the life".

[0005] Building underpinning is the most important key technology for the overall lifting of buildings. The traditional building underpinning method is to not damage the facade, and the underpinning structure is constructed below ±0.000, usually consisting of an upper tray structure, a lifting device, and a lower chassis structure. When affected by the excavation of surrounding deep foundation pits or the need to develop and utilize underground space, the underpinning method constructed below ±0.000 has the following technical defects: (1) The height of the underpinning structure is about 1.5 meters, and the underground space of the protective building needs to be newly built with a basement, etc. The layout of the underpinning structure will inevitably conflict with the development of the underground space; (2) The protective building is old and the foundation is shallow. When the groundwater level in the area is shallow, the use of traditional underpinning structures not only involves deep excavation and disturbance of the foundation soil layer, but also requires good precipitation work during the entire lifting process, which is not conducive to the control of uneven settlement of the protective building and the economy of the lifting transformation. Summary of the invention

[0006] In view of the above-mentioned shortcomings or deficiencies of the prior art, the technical problem to be solved by the present invention is how to complete the jacking and underpinning above ±0.000 of the building without damaging the building facade.

[0007] In order to solve the above technical problems, the present application provides a building jacking and underpinning device, which includes a tray beam and a plurality of jacking and underpinning structures, wherein the tray beam surrounds the bottom of the building foundation wall and is used to support the protective building;

[0008] Each jacking and underpinning structure includes anchor static pressure piles, jacking reaction beams, jacking steel beams, jacking steel columns and jacks;

[0009] The anchor static pressure pile is arranged vertically, passes through the pile hole on the pallet beam, the lower end of the anchor static pressure pile is arranged at the bottom of the building foundation, the upper end is higher than the pallet beam, and is fixedly connected to the jacking reaction beam located directly above it and arranged horizontally, the jacking steel beam is arranged horizontally directly above the jacking reaction beam, the jack is placed between the jacking reaction beam and the jacking steel beam, the jacking steel column is arranged vertically close to the anchor static pressure pile, the lower end is fixedly connected to the pallet beam, and the upper end is fixedly connected to the jacking steel beam;

[0010] When the jack is lifted, the lifting reaction beam provides reaction force support for the jack, and the lifting steel beam is lifted upward along with the lifting of the jack, and then the pallet beam is pulled through the lifting steel column, and the building is lifted synchronously.

[0011] Furthermore, the anchor static pressure piles are divided into two groups, and the two groups of anchor static pressure piles are symmetrically arranged on both sides of the building's large footing; the jacking steel columns are divided into two groups, and the two groups of jacking steel columns are symmetrically arranged, and each group of jacking steel columns is arranged on the outside of the anchor static pressure piles on the same side.

[0012] Furthermore, the jack includes a hydraulic jack and two follower jacks, and the two follower jacks are respectively placed on both sides of the hydraulic jack.

[0013] Furthermore, the hydraulic jack is provided with a full-stroke self-locking thread.

[0014] Furthermore, the jacking and supporting device also includes a stiffening rib plate, and the stiffening rib plate is arranged at the jacking force point of the jacking steel beam.

[0015] Furthermore, a steel plate is embedded in the pallet beam and is anchored and connected to the jacking steel column by high-strength bolts.

[0016] Furthermore, transverse ribs and longitudinal ribs are provided inside the jacking steel column to enhance the rigidity of the jacking steel column.

[0017] Furthermore, the jacking steel column and the jacking steel beam are fixedly connected by full welding.

[0018] Furthermore, the jacking reaction beam, jacking steel beam and jacking steel column are H-shaped steel splicing structures.

[0019] Based on another aspect of the present application, a building lifting and underpinning method is also provided, comprising the following steps:

[0020] S1 Cast pallet beams around the walls of the building foundation so that the top elevation of the pallet beams is below ±0.000;

[0021] S2 passes the anchor static pressure pile through the pile hole reserved on the pallet beam, so that the bottom of the anchor static pressure pile is buried in the foundation and the head of the anchor static pressure pile is higher than the pallet beam;

[0022] S3 installs the jacking reaction beam, jacking steel column and jacking steel beam in sequence;

[0023] S3 installs a jack between the jacking reaction beam and the jacking steel beam;

[0024] S4 controls the jack to start lifting. When the jack is lifted, the lifting reaction beam provides reaction support for the jack. The lifting steel beam is lifted upward along with the lifting of the jack, and then the pallet beam is pulled through the lifting steel column, and the building is lifted synchronously.

[0025] Compared with the prior art, this application has the following technical effects:

[0026] 1. In this application, pallet beams are used around the bottom of the building foundation wall to support the building so that the building can be lifted up along with the pallet beams, thus achieving the lifting and replacement of the building above ±0.000 without damaging the building's facade.

[0027] 2. The pallet beam construction of this application is below ±0.000. During the construction phase, the pallet beam can be used as the pallet of the entire building, and during the use phase, it can be used as the foundation beam of the building. It does not need to be dismantled, saving construction costs.

[0028] 3. In this application, jacking steel columns and jacking steel beams are used to form a jacking frame for building jacking, and jacking reaction beams and anchor static pressure piles are used to form a reaction support system for building lifting. Under the jacking action of the jack and the deadweight of the building, the building jacking is completed. The whole set of equipment has clear force transmission and stable structure.

[0029] 4. The hydraulic jack in this application uses a follower jack for follow-up protection during the lifting stage, which fundamentally eliminates dangerous situations such as power outages and internal leakage of the hydraulic jack.

[0030] 5. The jacking reaction beam, jacking steel beam and jacking steel column in this application all adopt a steel splicing structure, which is easy to dismantle and can be reused, saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 : A schematic structural elevation diagram of a jacking and underpinning device in one embodiment of the present application;

[0033] Figure 2 : Figure 1Elevation diagram of the connection structure between the middle lifting steel column and the pallet beam;

[0034] Figure 3 : Figure 1 Schematic diagram of the connection structure between the middle lifting steel column and the pallet beam;

[0035] Anchor static pressure pile 1, pallet beam 2, embedded steel plate 3, high-strength bolts 4, jacking steel column 5, jacking reaction beam 6, follower jack 7, stiffening rib 8, hydraulic jack 9, jacking steel beam 10, longitudinal rib 11, transverse rib 12. DETAILED DESCRIPTION

[0036] The concept, specific structure and technical effects of the present invention will be further explained below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. It should be noted that the words "front", "rear", "left", "right", "up", "down", "bottom" and "top" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0037] In one embodiment of the present application, a building jacking and underpinning device is provided, comprising a pallet beam 2 and a plurality of jacking and underpinning structures, wherein the pallet beam 2 surrounds the bottom of the building foundation wall and is used to support the protective building;

[0038] Figure 1 The figure shows a schematic elevation view of one of the jacking and underpinning structures in the above embodiment. Each jacking and underpinning structure includes an anchor static pressure pile 1, a jacking steel column 5, a jacking reaction beam 6, a jacking steel beam 10, and a jack;

[0039] The anchor static pressure pile 1 is vertically arranged, and the anchor static pressure pile 1 passes through the pile hole on the pallet beam 2, the lower end of the anchor static pressure pile 1 is arranged at the bottom of the building foundation, and the upper end is higher than the pallet beam 2, the anchor static pressure pile 1 is fixedly connected to the jacking reaction beam 6 located directly above it and arranged horizontally, the jacking steel beam 10 is horizontally arranged directly above the jacking reaction beam 6, the jack is placed between the jacking reaction beam 6 and the jacking steel beam 10, the jacking steel column 5 is vertically arranged close to the anchor static pressure pile 1, the lower end of the jacking steel column 5 is fixedly connected to the pallet beam 2, and the upper end is fixedly connected to the jacking steel beam 10;

[0040] When the jack is lifted, the lifting reaction beam 6 provides reaction force support for the jack, and the lifting steel beam 10 is lifted upward with the lifting of the jack, and then the pallet beam 2 is pulled through the lifting steel column 5, and the building is lifted synchronously.

[0041] The pallet beam 2 is composed of a wall-clamping beam, a column-holding beam, and a connecting beam, which jointly bear the building load and improve the overall vertical stiffness of the building. The wall-clamping beam surrounds the foundation wall, and when encountering a wall barrier, a hole is drilled through the wall to form a whole; the column-holding beam surrounds the reinforced concrete column; the connecting beam connects the wall-clamping beam and forms a plane frame force system with the column-holding beam; the pallet beam 2 is set around the building foundation wall, so that the upper structure load of the building is completely transferred to the pallet beam 2. The pallet beam 2 is a concrete structure, and pile holes are reserved during on-site pouring construction.

[0042] The pallet beam 2 surrounds the bottom of the building foundation wall and is used to support the building so that the building can be lifted up along with the pallet beam 2, thus achieving lifting and replacement of the building above ±0.000 without damaging the building's facade.

[0043] The anchor static pressure pile 1 can effectively solve the problem of excessive sinking and uneven settlement of the entire building. The anchor static pressure pile 1 should be set as close as possible to both sides of the foundation footing. The use of anchor static pressure pile 1 is a pile foundation construction process formed by combining anchors and static pressure piles. It is achieved by burying anchors on the foundation to fix the pile frame, using the building's own weight as the pile pressure reaction force, and using a jack to press the pile sections into the foundation from the pile holes reserved on the upper tray beam 2. The diameter of the anchor static pressure pile 1 needs to meet the bearing capacity requirements. As a preferred embodiment of this embodiment, the anchor static pressure pile is extended by welding multiple single sections, and the length of each single section is 2 meters.

[0044] The jacking reaction beam 6 is fully welded to the anchor static pressure pile 1. In the embodiment of the present application, the jacking reaction beam 6 is transversely arranged above the anchor static pressure pile 1, and forms a jacking reaction support system with the anchor static pressure pile 1. The jacking reaction beam 6 serves as a supporting structure of the jack, transmitting the force of the jack to the anchor static pressure pile 1.

[0045] The two ends of the jacking steel column 5 are respectively connected to the pallet beam 2 and the jacking steel beam 10. During the jacking stage of the building, the jacking steel column 5 mainly bears the tensile force. The jacking steel beam 10 is connected to the jacking steel column 5 by full welding to form a jacking frame. This full welding connection method can withstand both bending moment and a certain tensile force.

[0046] As a preferred embodiment of the present invention, the lifting steel beam 10 and the lifting reaction beam 6 are spliced ​​by HM (middle flange H-shaped steel), and the height and width of HM (middle flange H-shaped steel) are 550mm*300mm. The lifting column is spliced ​​by HW (wide flange H-shaped steel), and the height and width of HW (wide flange H-shaped steel) are 400mm*400mm.

[0047] In each jacking and underpinning structure, the jacking steel column 5 and the jacking steel beam 10 constitute the jacking frame of the building jacking, and the jacking reaction beam 6 and the anchor static pressure pile 1 constitute the reaction force support system of the building lifting. Under the jacking action of the jack and the deadweight of the building, the building jacking is completed. The whole set of jacking and underpinning device has clear force transmission and stable structure.

[0048] In one embodiment of the present application, the anchor static pressure piles 1 are divided into two groups, and the two groups of anchor static pressure piles 1 are symmetrically arranged on both sides of the building's large footing; the jacking steel columns 5 are divided into two groups, and the two groups of jacking steel columns 5 are symmetrically arranged, and each group of jacking steel columns 5 is arranged on the outside of the anchor static pressure piles 1 on the same side. Figure 1 In a preferred scheme of an embodiment shown, there are two anchor static pressure piles 1, which are arranged close to the left and right sides of the foundation footing, and there are two jacking steel columns 5, one jacking steel column 5 is placed on the left side of the anchor static pressure pile 1, and the other jacking steel column 5 is placed on the right side of the anchor static pressure pile 1.

[0049] The jack is installed between the jacking reaction beam 6 and the jacking steel beam 10 to provide jacking force for the building jacking.

[0050] In one embodiment of the present application, each jack of the lifting and underpinning structure includes a hydraulic jack 9 and two follower jacks 7, and the two follower jacks 7 are respectively placed on both sides of the hydraulic jack 9. The hydraulic jack 9 uses a hydraulic drive to provide lifting force; the follower jack 7 uses a hydraulic drive mechanical following mechanism, and when the hydraulic jack 9 is lifted, the follower jack 7 actively follows, playing a role of real-time following protection.

[0051] As a preferred embodiment of the present invention, the hydraulic jack 9 is provided with a full-stroke self-locking thread, which can solve the problem of tightening the self-locking nut when replacing the pad, and realize that the hydraulic jack 9 can also be locked by itself. In addition, the balance protection load-sharing valve in the hydraulic jack 9 is a leak-free cone valve structure, which has four main functions. The first function is to balance the load pressure of the hydraulic jack 9, so that the hydraulic jack 9 that is lowered with load will not lose pressure and slide down, and the workpiece will not fall even when the oil pipe is broken; the second function is to protect the hydraulic jack 9 from overload. When the pressure in the hydraulic jack 9 exceeds the set pressure, the load-sharing valve can automatically open to unload the excessive oil pressure and balance the load of the hydraulic jack 9. The load-balancing valve is a plate-type connection and can be directly installed on the hydraulic jack 9, minimizing the trouble caused by external pipes; the third function is the oil inlet speed regulation function, which avoids the significant impact of excessive hydraulic fluctuations on the load when the system switches between synchronous lifting and synchronous lowering; the fourth is that when multiple hydraulic jacks 9 with balancing valves support a heavy load at the same time, when synchronous lowering is required, the hydraulic jack 9 with a larger load will open first (heavy load first opening function), which truly ensures the reliable synchronous lowering function of the system.

[0052] The hydraulic motor of the follower jack 7 drives the mechanical screw to follow automatically, so that the mechanical screw is stressed (rigidly stressed), the stress is reliable and risk-free. When the hydraulic jack 9 is lifted, the follower jack 7 can follow and protect in real time, and can achieve mechanical self-locking without relying on the hydraulic system when an accident occurs. The follower jack 7 can actively load a mechanical top with a pre-tension of tens of tons at most (similar to the principle of a hydraulic stretcher, allowing it to generate a pre-tightening force and then tighten the screw), which can eliminate the deformation and installation gap of the steel support pad. It fundamentally and thoroughly solves the dangerous sources such as power outages, internal leakage of hydraulic tops, damage to hydraulic seals, and failures of computer controls or electronic components, and realizes practical protection. In addition, the follower jack 7 can actively load a pre-tightening force of tens of tons at most (similar to the principle of a hydraulic stretcher, allowing it to generate a pre-tightening force and then tighten the screw), which can eliminate the deformation and installation gap of the steel support pad.

[0053] In the jacking and replacing device provided in the present application, the hydraulic jack 9 and the follower jack 7 are used in combination, and both the hydraulic jack 9 and the follower jack 7 can achieve self-locking when they are independently subjected to force when replacing the pad, thereby preventing power outages, internal leakage of the hydraulic jack, damage to the hydraulic seal, failure of computer control or electronic components, etc., and improving the safety and stability of the entire jacking and replacing device.

[0054] In an embodiment of the present application, a hydraulic jack 9 and a follower jack 7 act on a lifting steel beam 10, and stiffening ribs 8 are added at the lifting force points of the lifting steel beam 10 to improve the stability and torsional resistance of the lifting steel beam 10. As a preferred embodiment, three stiffening ribs 8 are arranged at each lifting point, for a total of nine ribs.

[0055] In addition, if Figure 2 and Figure 3 As shown, transverse ribs 12 and longitudinal ribs 11 are provided in the jacking steel column 5 to enhance the rigidity of the jacking steel column 5 .

[0056] In one embodiment of the present application, during the construction of the pallet beam 2, an embedded hole is reserved, and a steel plate 3 is embedded in the embedded hole of the pallet beam 2, and the jacking steel column 5 is anchored and connected to the pallet beam 2 by high-strength bolts 4.

[0057] In one embodiment of the present application, as a preference, the jacking reaction beam 6, the jacking steel beam 10 and the jacking steel column 5 are H-shaped steel splicing structures, which are easy to dismantle, have a high reuse rate, and save construction costs.

[0058] The working mechanism of the building jacking and replacement is as follows: in the jacking stage, the hydraulic jack 9 pulls the jacking steel column 5 through the jacking steel beam 10, and pulls the tray beam 2 to jack up synchronously, and the jacking reaction beam 6 provides the reaction force support of the jack, transmits the force to the anchor static pressure pile 1, and the follower jack 7 adopts hydraulic drive mechanical following to actively follow in real time; in the stage of replacing the lower pad of the follower jack 7, after the hydraulic jack 9 jacks up a stroke, the pressure retaining ring on the head of the hydraulic jack 9 is rotated to make the pressure retaining ring and the pressure retaining ring contact each other. The supporting pads are in close contact to protect the hydraulic pressure. The follower jack 7 is retracted and a supporting pad is added at the bottom of the follower jack 7. During the stage of replacing the pad at the bottom of the hydraulic jack 9, the follower jack 7 is pressurized out of the cylinder after the pad is replaced, and the protective building superstructure load is completely transferred from the hydraulic jack 9 to the follower jack 7, and then the pressure is maintained and mechanically self-locked. The hydraulic jack 9 is retracted and a supporting pad is added at the bottom of the hydraulic jack 9. Repeat the above operations until the designed lifting height is reached.

[0059] By using the building jacking and underpinning method using the jacking and underpinning device, the jacking and underpinning of a building can be completed. The method specifically comprises the following steps:

[0060] S1: Cast pallet beams 2 around the walls of the building foundation so that the top elevation of the pallet beams 2 is below ±0.000. As a preferred embodiment, the top elevation of the pallet beams 2 is controlled to be 5 cm below the indoor floor. Roughen the wall surfaces on both sides of the walls and columns of the building foundation that need to be lifted and replaced, and cast the wall beams, column beams, and connecting beams in succession to form a flat pallet beam system structure. Reserve pile holes and embedded holes on the pallet beams 2;

[0061] S2 passes the anchor static pressure pile 1 through the pile hole reserved on the pallet beam 2, so that the bottom of the anchor static pressure pile 1 is buried in the foundation, and the head of the anchor static pressure pile 1 is higher than the pallet beam 2;

[0062] S3 sequentially installs the jacking reaction beam 6, the jacking steel column 5 and the jacking steel beam 10;

[0063] S3 installs a jack between the jacking reaction beam 6 and the jacking steel beam 10;

[0064] S4 controls the jack to start lifting. When the jack is lifted, the lifting reaction beam 6 provides reaction force support for the jack, and the lifting steel beam 10 is lifted upward with the lifting of the jack, and then the pallet beam 2 is pulled through the lifting steel column 5, and the building is driven to lift synchronously.

[0065] The above embodiments are only used to illustrate the technical solution of the present invention but not to limit it. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, and all should be included in the scope of the claims of the present invention.

Claims

1. A building lifting and underpinning device, characterized in that: It includes a pallet beam and a plurality of jacking and underpinning structures, wherein the pallet beam surrounds the bottom of the building foundation wall and is used to support the protective building; Each jacking and underpinning structure includes anchor static pressure piles, jacking reaction beams, jacking steel beams, jacking steel columns and jacks; The anchor static pressure pile is arranged vertically, passes through the pile hole on the pallet beam, the lower end of the anchor static pressure pile is arranged at the bottom of the building foundation, the upper end is higher than the pallet beam, and is fixedly connected to the jacking reaction beam located directly above it and arranged horizontally, the jacking steel beam is arranged horizontally directly above the jacking reaction beam, the jack is placed between the jacking reaction beam and the jacking steel beam, the jacking steel column is arranged vertically close to the anchor static pressure pile, the lower end is fixedly connected to the pallet beam, and the upper end is fixedly connected to the jacking steel beam; When the jack is lifted, the lifting reaction beam provides reaction force support for the jack, and the lifting steel beam is lifted upward along with the lifting of the jack, and then the pallet beam is pulled through the lifting steel column, and the building is lifted synchronously. The anchor static pressure piles are divided into two groups, and the two groups of anchor static pressure piles are symmetrically arranged on both sides of the building's large footing; the jacking steel columns are divided into two groups, and the two groups of jacking steel columns are symmetrically arranged, and each group of jacking steel columns is arranged on the outside of the anchor static pressure piles on the same side. The jack comprises a hydraulic jack and two follower jacks, and the two follower jacks are respectively placed on both sides of the hydraulic jack.

2. The building lifting and underpinning device according to claim 1, characterized in that: The hydraulic jack is provided with a full-stroke self-locking thread.

3. The building lifting and underpinning device according to claim 1, characterized in that: The jacking and supporting device also includes a stiffening rib plate, and the stiffening rib plate is arranged at the jacking force point of the jacking steel beam.

4. The building lifting and underpinning device according to claim 1, characterized in that: The steel plate is embedded in the pallet beam and is anchored and connected to the jacking steel column by high-strength bolts.

5. The building lifting and underpinning device according to claim 1, characterized in that: The jacking steel column is provided with transverse ribs and longitudinal ribs to enhance the rigidity of the jacking steel column.

6. The building lifting and underpinning device according to claim 1, characterized in that: The jacking steel column and the jacking steel beam are fixedly connected by full welding.

7. The building lifting and underpinning device according to claim 1, characterized in that: The jacking reaction beam, jacking steel beam and jacking steel column are H-shaped steel splicing structures.

8. A method for lifting and underpinning a building, characterized in that: The method comprises the following steps: S1 Cast pallet beams around the walls of the building foundation so that the top elevation of the pallet beams is below ±0.000; S2 passes the anchor static pressure pile through the pile hole reserved on the pallet beam, so that the bottom of the anchor static pressure pile is buried in the foundation and the head of the anchor static pressure pile is higher than the pallet beam; S3 installs the jacking reaction beam, jacking steel column and jacking steel beam in sequence; S3 installs a jack between the jacking reaction beam and the jacking steel beam; S4 controls the jack to start lifting. When the jack is lifted, the lifting reaction beam provides reaction support for the jack. The lifting steel beam is lifted upward along with the lifting of the jack, and then the pallet beam is pulled through the lifting steel column, and the building is lifted synchronously.

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