A method for jacking up by replacing column by cutting

Abstract

The present invention provides a column-cutting and underpinning jacking method, wherein a bottom plate, a structural beam and a structural column are sequentially connected from bottom to top, the structural columns are horizontally spaced and distributed on the structural beam, and the top of the bottom plate is sequentially covered with fill and floor, and the column-cutting and underpinning jacking method comprises: breaking the floor and excavating the fill in a local area next to the structural column to be cut off. The column-cutting and underpinning jacking method installs a support base, a support pile and a jacking device between the building and the foundation before jacking to achieve reinforcement between the building and the foundation, and ensure the safety of the building during subsequent jacking. In addition, the column-cutting and underpinning jacking method only lifts the structural columns and buildings above the bottom plate, avoiding the situation where there is thick fill or other loads above the bottom plate, resulting in high earth excavation or load removal costs and large jacking loads, thereby reducing the project cost.

Description

Technical Field

[0001] The invention relates to the technical field of building structure reinforcement, and in particular to a column cutting, underpinning and lifting method. Background Art

[0002] Column truncation and replacement jacking is a process of truncating the original columns, using the replacement structure to temporarily support the upper load, then jacking the upper structure to a predetermined height through jacking equipment, and finally installing or pouring the columns in the new position. Its purpose is usually to meet the needs of building renovation or reinforcement, such as adding floors, adjusting floor heights or improving building functions.

[0003] The existing column cutting and lifting method has the following defects:

[0004] In the column cutting and jacking method, the building and the foundation are not reinforced before being cut, resulting in poor safety. In addition, the existing column cutting and jacking method uses the entire foundation of the building to jack up, and the jacking load is huge. When there is deep fill or other loads on the bottom plate, the cost of excavation or load removal is high.

[0005] Therefore, in order to solve the above problems, the present invention proposes a column-cutting underpinning jacking method which can reinforce the space between the building and the foundation before jacking and has a small jacking load. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned existing column cutting and jacking method, the present invention provides a column cutting and replacing jacking method.

[0007] According to one object of the present invention, the present invention provides a column-cutting underpinning and lifting method, wherein a bottom plate, a structural beam and a structural column are sequentially connected from bottom to top, the structural columns are spaced and distributed on the structural beam in a horizontal direction, and the top of the bottom plate is sequentially covered with fill soil and a floor, and the column-cutting underpinning and lifting method comprises:

[0008] Break the floor and excavate the fill in the local area next to the structural column to be cut off;

[0009] Constructing a support cap on the outside of the structural column that needs to be lifted, pre-embedding anchor rods and pre-reserving pile holes on the support cap, and drilling holes at the bottom plate position directly below the pile holes;

[0010] Inserting the underpinning pile into the soil below the bottom plate through the pile pressing hole and the opening at the bottom plate until the underpinning pile reaches the designed depth;

[0011] A jacking device is provided between the underpinning cap and the underpinning pile, wherein the jacking device is suitable for adjusting the height of the underpinning cap on the underpinning pile;

[0012] Cutting off the structural column between the structural beam and the underpinning cap;

[0013] The jacking device jacks up the upper part of the cut structural column through the underpinning platform to achieve the jacking up of the entire building above the structural column;

[0014] The underpinning piles are sealed and the jacking device is removed.

[0015] Preferably, a replacement cap is constructed outside the structural column of the portion that needs to be jacked up, and a specific method for implementing the replacement cap includes: the replacement cap is connected to the structural column by means of embedded reinforcement and / or roughening the concrete surface.

[0016] Preferably, the underpinning cap extends horizontally to both sides of the structural column, and the underpinning cap is provided with embedded anchor rods and reserved pile driving holes on both sides of the structural column, and the underpinning piles are arranged on both sides of the structural column through the pile driving holes. Correspondingly, the underpinning cap is respectively provided with one of the jacking devices on both sides of the structural column in the radial direction.

[0017] Preferably, the jacking device includes: an extended anchor rod, a force transmission steel, a reaction beam 1, a jack and a reaction beam 2. The extended anchor rod is installed above the embedded anchor rod, and the reaction beam 1, the jack and the reaction beam 2 are installed in sequence from bottom to top on the top of the replacement pile. The reaction beam 1 and the reaction beam 2 both pass through and are detachably connected to the extended anchor rod.

[0018] Preferably, the local area next to the structural column to be truncated is a truncated cone-shaped area with the structural column as the axis, the bottom surface of the truncated cone-shaped area is flush with the bottom plate, the top surface of the truncated cone-shaped area is flush with the floor, the radius of the truncated cone-shaped area is in the range of 2 to 3 meters, and the structural column, the structural beam and the bottom plate are all exposed in the truncated cone-shaped area.

[0019] Preferably, the underpinning piles are sealed, and the specific implementation method includes: after the building is lifted as a whole, backfilling is carried out around the underpinning cap, and the gap between the underpinning cap and the underpinning piles is filled with materials such as crushed stone, coarse sand, and fine sand until it is flush with the upper end surface of the underpinning cap.

[0020] Preferably, the method for sealing the underpinning piles also includes: grouting into the interior of the underpinning pile, wherein holes are reserved on the top side of the underpinning pile, and the slurry can pass through the holes to fill the gaps between the underpinning pile, the underpinning pedestal, the structural column and the base plate, and after the slurry solidifies, the four are connected by the slurry to form a stable whole.

[0021] Preferably, the jacking device is dismantled, and a specific method for implementing the dismantling includes: dismantling the second reaction beam, the jack and the first reaction beam in sequence, and cutting off the redundant lengthened anchor rods and the force-transmitting steel.

[0022] Preferably, the column-cutting replacement jacking method further comprises: after removing the jacking device, backfilling the excavated backfill and restoring the original appearance of the floor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The column-cutting and underpinning jacking method installs an underpinning cap, an underpinning pile and a jacking device between the building and the foundation before jacking to achieve reinforcement between the building and the foundation and ensure the safety of the building during subsequent jacking. In addition, the column-cutting and underpinning jacking method only jacks the structural columns and buildings above the base plate, avoiding the situation where there is deep fill or other loads above the base plate, which leads to high earth excavation or load removal costs and large jacking loads, thereby reducing the project cost.

[0025] The present invention is further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of column cutting and supporting jacking of a column cutting and supporting jacking method according to the present invention;

[0027] Figure 2 It is a schematic elevation diagram of the foundation structure of a column-cutting, underpinning and lifting method according to the present invention;

[0028] Figure 3 It is a schematic plan view of the basic structure of a column-cutting and underpinning jacking method according to the present invention;

[0029] Figure 4 A schematic diagram of a construction condition of a column cutting and replacement jacking method according to the present invention;

[0030] Figure 5 This is a schematic diagram of a second construction condition of a column-cutting, supporting and lifting method according to the present invention;

[0031] Figure 6 It is a schematic diagram of the third construction condition of a column cutting and replacement jacking method according to the present invention;

[0032] Figure 7 This is a schematic diagram of the fourth construction condition of a column cutting and replacement jacking method according to the present invention;

[0033] Figure 8 A fifth schematic diagram of a construction condition of a column-cutting, underpinning and lifting method according to the present invention;

[0034] Fig. 9Schematic diagram of the construction working condition of the column cutting and replacement jacking method according to the present invention;

[0035] Fig.10 Schematic diagram of the seventh construction condition of the column cutting and replacement jacking method according to the present invention;

[0036] Fig.11 This is a schematic diagram of the construction condition of the column cutting and replacement jacking method described in the present invention. DETAILED DESCRIPTION

[0037] The following description is used to fully explain the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0038] The present invention provides a technical solution: a column-cutting replacement and jacking method, see Figure 2 and 3 , the bottom plate 2, the structural beam 3 and the structural column 6 are sequentially connected from bottom to top, the structural columns 6 are spaced apart on the structural beam 3 in the horizontal direction, the top of the bottom plate 2 is sequentially covered with fill 4 and the floor 5, and the bottom of the bottom plate 2 is provided with a cushion layer 1;

[0039] The column cutting, underpinning and lifting method comprises:

[0040] S1. See Figure 4 , breaking the floor 5 and excavating the backfill 4 in the local area beside the structural column 6 to be cut off, until the structural column 6, the structural beam 3 and the bottom plate 2 are all exposed; wherein the size of breaking the floor 5 and excavating the backfill 4 in the local area beside the structural column 6 is suitable for providing a sufficient construction working surface for the underpinning pedestal 7. In one embodiment, the local area beside the structural column 6 to be cut off is a truncated cone-shaped area with the structural column 6 as the axis, the bottom surface of the truncated cone-shaped area is flush with the bottom plate 2, the top surface of the truncated cone-shaped area is flush with the floor 5, the radius of the truncated cone-shaped area is in the range of 2 to 3 meters, specifically, the radius of the bottom surface of the truncated cone-shaped area is 2 meters, the radius of the top surface of the truncated cone-shaped area is 3 meters, and the structural column 6, the structural beam 3 and the bottom plate 2 are all exposed in the truncated cone-shaped area;

[0041] S2. See Figure 5, construct an underpinning cap 7 outside the structural column 6 of the part that needs to be lifted, pre-embed anchor rods 8 and reserve pile pressure holes 9 on the underpinning cap 7, and open a hole at the position of the bottom plate 2 directly below the pile pressure hole 9. The opening at the position of the bottom plate 2 and the pile pressure hole 9 are suitable for the underpinning pile 14 to pass through, wherein the diameter of the opening of the bottom plate 2 is equal to the diameter of the pile pressure hole 9, ensuring that the pile pressure hole 9 and the opening at the position of the bottom plate 2 can smoothly pass the underpinning pile 14;

[0042] Regarding the above-mentioned construction of the underpinning cap 7 outside the structural column 6 that needs to be jacked up, the specific implementation method includes: the underpinning cap 7 is effectively connected to the structural column 6 by measures such as planting reinforcement and roughening the concrete surface.

[0043] S3. See Figure 5 , the underpinning pile 14 is inserted into the soil below the bottom plate 2 through the pile pressing hole 9 and the opening at the bottom plate 2 until the underpinning pile 14 reaches the designed depth;

[0044] See also Figure 6 , a jacking device is provided between the underpinning cap 7 and the underpinning pile 14, and the jacking device is suitable for adjusting the height of the underpinning cap 7 on the underpinning pile 14;

[0045] Preferably, in step S2, the underpinning cap 7 extends to both sides of the structural column 6 in the horizontal direction, and the underpinning cap 7 is provided with embedded anchor rods 8 and reserved pile holes 9 on both sides of the structural column 6. In step S3, the underpinning piles 14 are provided on both sides of the structural column 6 through the pile holes 9. Correspondingly, the underpinning cap 7 is provided with a jacking device on both sides of the structural column 6 in the radial direction. By arranging the jacking devices on different sides of the structural column 6, while improving the jacking efficiency of the jacking device on the truncated structural column 6, the correction accuracy during the jacking process can be improved to a certain extent, thereby ensuring the safety of the jacking.

[0046] Continue to see Figure 6Specifically, the jacking device includes an extension anchor rod 8, a force transmission steel 10, a reaction beam 11, a jack 12 and a reaction beam 2 13. The extension anchor rod 8 is installed above the embedded anchor rod 8. The reaction beam 11, the jack 12 and the reaction beam 2 13 are installed in sequence from bottom to top on the top of the underpinning pile 14. The reaction beam 1 11 and the reaction beam 2 13 are both connected to the extension anchor rod 8 in a detachable manner. More specifically, the reaction beam 1 11 and the reaction beam 2 13 are both detachably connected to the extension anchor rod 8 through nuts. The extension anchor rods 8 on both sides control the tightness relationship between the extension anchor rod 8 and the two reaction beams by tightening or loosening nuts, so that the extension anchor rod 8 can freely pass through the reaction beams to transmit force. The advantage of the two reaction beams is that the stroke can be changed at any time. It is suitable for projects with large tonnage and large jacking volume, and is safe and reliable.

[0047] In one of the embodiments, the specific structure of the jacking device is the same as the structure of a building reinforcement, deviation correction and support replacement device disclosed in the Chinese utility model patent with publication number CN216713138U, which is the prior art and will not be described in detail here.

[0048] S4. See Figure 7 , cutting off the structural column 6 between the structural beam 3 and the underpinning pedestal 7. Regarding the above-mentioned cutting off of the structural column 6 between the structural beam 3 and the underpinning pedestal 7, its specific implementation method includes using a cutting tool such as a rope saw to cut off the structural column 6, cutting off the connection between the structural column 6 and the bottom plate 2 and the structural beam 3, so that when the jacking device lifts the cut structural column 6, the bottom plate 2 and the structural beam 3 do not move, and only the upper structural column 6 and the building move, thereby reducing the jacking load, reducing the number of underpinning piles 14, and reducing the project cost.

[0049] S5. See Figure 8 The jacking device jacks up the upper part of the structural column 6 after truncation through the underpinning platform 7 to achieve the jacking of the entire building above the structural column 6. The bottom plate 2, the structural beam 3 and the upper part of the structural column 6 after truncation are gradually separated as the jacking amount increases until the building reaches the designed jacking amount. The jacking device is used as follows: during jacking, the nut of the reaction beam 2 13 is tightened and locked, the nut of the reaction beam 1 11 is loosened, and the reaction beam 2 13 rises with the jack 12; after reaching the range of the jack 12, the nut of the reaction beam 1 11 is tightened and locked to prevent the building from falling, the nut of the reaction beam 2 13 is loosened, the jack 12 is depressurized, and the reaction beam 2 13 falls with the jack 12; after the fall is completed, the nut of the reaction beam 2 13 is tightened and locked, the nut of the reaction beam 1 11 is loosened, and the reaction beam 2 13 rises with the jack 12; this process is repeated until the jacking is completed.

[0050] S6. See Fig. 9 , seal the underpinning pile 14 and remove the jacking device.

[0051] Specifically, regarding the above-mentioned sealing of the underpinning pile 14, the specific implementation method thereof includes:

[0052] S61. After the building is lifted as a whole, backfill the surrounding of the underpinning platform 7, and use gravel, coarse sand, fine sand and other materials to fill the gap between the underpinning platform 7 and the underpinning pile 14 until it is flush with the upper end surface of the underpinning platform 7;

[0053] S62. Grouting is performed inside the underpinning pile 14, wherein holes are reserved on the top side of the underpinning pile 14, and the grout can pass through the holes to fill the gaps between the underpinning pile 14, the underpinning cap 7, the structural column 6 and the bottom plate 2. After the grout solidifies, the four are connected by the grout to form a stable whole. The underpinning pile 14 serves as the new foundation of the building after jacking, and complements the bottom plate 2 to improve the safety of the building.

[0054] Regarding the removal of the jacking device, the specific implementation method includes:

[0055] S63.See Fig.10 , remove the reaction beam 2 13, the jack 12 and the reaction beam 1 11 in sequence, and cut off the redundant lengthened anchor rods 8 and the force transmission steel 10. The redundant reinforcing anchor rods 8 and the force transmission steel 10 refer to the parts of the reinforcing anchor rods 8 and the force transmission steel 10 located above the upper end surface of the underpinning platform 7.

[0056] Furthermore, the column cutting and replacement jacking method also includes:

[0057] S7. See Fig.11 , the floor 5 is restored. Specifically, the fill soil 4 excavated in step S1 is backfilled to restore the original appearance of the floor 5.

[0058] In summary, in the column-cutting and column-replacement jacking method, a replacement cap 7, a replacement pile 14 and a jacking device are installed between the building and the foundation before jacking to achieve reinforcement between the building and the foundation and ensure the safety of the building during subsequent jacking. In addition, in the column-cutting and column-replacement jacking method, only the structural columns 6 and the building above the base plate 2 are lifted, thereby avoiding the situation where there is deep fill 4 or other loads above the base plate 2, which leads to high costs for earth excavation or load removal and large jacking loads, thereby reducing the project cost.

[0059] The column-cutting underpinning and jacking method simplifies the jacking steps and improves the quickness of the underpinning and jacking.

[0060] The embodiments described above are only used to illustrate the technical ideas and features of the present invention, and their purpose is to enable technicians in this field to understand the contents of the present invention and implement them accordingly. The patent scope of the present invention cannot be limited only by this embodiment, that is, any equivalent changes or modifications made according to the spirit disclosed by the present invention still fall within the patent scope of the present invention.

Claims

1. A column-cutting and underpinning method, wherein a base plate (2), a structural beam (3) and a structural column (6) are sequentially connected from bottom to top, the structural columns (6) are spaced apart on the structural beam (3) in the horizontal direction, and the top of the base plate (2) is sequentially covered with fill (4) and a floor (5), characterized in that: The column cutting, underpinning and lifting method comprises: Breaking the floor (5) and excavating the fill (4) in a local area next to the structural column (6) to be cut; A replacement cap (7) is constructed outside the structural column (6) of the part to be lifted, anchor rods (8) are pre-buried and pile holes (9) are reserved on the replacement cap (7), and a hole is opened at a position of the base plate (2) directly below the pile holes (9); Inserting the underpinning pile (14) into the soil below the bottom plate (2) through the pile-pressing hole (9) and the opening at the bottom plate (2) until the underpinning pile (14) reaches the designed depth; A jacking device is arranged between the underpinning platform (7) and the underpinning pile (14), wherein the jacking device is suitable for adjusting the height of the underpinning platform (7) on the underpinning pile (14); Cutting off the structural column (6) between the structural beam (3) and the underpinning platform (7); The jacking device jacks up the upper part of the cut structural column (6) through the supporting platform (7) to achieve the jacking up of the entire building above the structural column (6); The underpinning pile (14) is sealed and the jacking device is removed.

2. A column-cutting underpinning and lifting method according to claim 1, characterized in that: A replacement cap (7) is constructed outside the structural column (6) of the part that needs to be lifted, and its specific implementation method includes: the replacement cap (7) is connected to the structural column (6) by means of planting reinforcement and / or roughening the concrete surface.

3. A column-cutting underpinning and lifting method according to claim 1, characterized in that: The underpinning cap (7) extends horizontally to both sides of the structural column (6); the underpinning cap (7) is provided with embedded anchor rods (8) and reserved pile holes (9) on both sides of the structural column (6); the underpinning piles (14) are arranged on both sides of the structural column (6) through the pile holes (9); correspondingly, the underpinning cap (7) is provided with one jacking device on both sides of the structural column (6) in the radial direction.

4. A column-cutting underpinning and lifting method according to claim 1, characterized in that: The jacking device comprises: an extended anchor rod (8), a force transmission steel (10), a reaction beam one (11), a jack (12) and a reaction beam two (13); the extended anchor rod (8) is installed above the embedded anchor rod (8); the reaction beam one (11), the jack (12) and the reaction beam two (13) are installed in sequence from bottom to top on the top of the underpinning pile (14); the reaction beam one (11) and the reaction beam two (13) both pass through and are detachably connected to the extended anchor rod (8).

5. A column-cutting underpinning and lifting method according to claim 1, characterized in that: The local area next to the structural column (6) to be cut off is a truncated cone-shaped area with the structural column (6) as the axis, the bottom surface of the truncated cone-shaped area is flush with the bottom plate (2), the top surface of the truncated cone-shaped area is flush with the floor (5), the radius of the truncated cone-shaped area is in the range of 2 to 3 meters, and the structural column (6), the structural beam (3) and the bottom plate (2) are all exposed in the truncated cone-shaped area.

6. A column-cutting underpinning and lifting method according to claim 1, characterized in that: The underpinning pile (14) is sealed by a method comprising: after the building is lifted as a whole, backfilling is performed around the underpinning platform (7), and the gap between the underpinning platform (7) and the underpinning pile (14) is filled with materials such as crushed stone, coarse sand, and fine sand until it is flush with the upper end surface of the underpinning platform (7).

7. A column-cutting underpinning and lifting method according to claim 6, characterized in that: The method for sealing the underpinning pile (14) also includes: injecting grout into the interior of the underpinning pile (14), wherein a hole is reserved on the top side of the underpinning pile (14), and the grout can pass through the hole to fill the gap between the underpinning pile (14), the underpinning pedestal (7), the structural column (6) and the base plate (2), and after the grout solidifies, the four are connected by the grout to form a stable whole.

8. A column-cutting underpinning and lifting method according to claim 1, characterized in that: The jacking device is dismantled, and its specific implementation method includes: dismantling the reaction beam 2 (13), the jack (12) and the reaction beam 1 (11) in sequence, and cutting off the redundant extended anchor rod (8) and the force transmission steel (10).

9. A column-cutting underpinning and lifting method according to claim 1, characterized in that: The column-cutting and replacement jacking method further comprises: after removing the jacking device, backfilling the excavated fill (4) and restoring the original appearance of the floor (5).

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