Reconstruction method of multi-story building supporting component

Abstract

The invention provides a reconstruction method of a multi-story building supporting component, which comprises the following steps: A, establishing a computer model according to the structure current situation of a multi-story building, and obtaining the top settling volume of a to-be-disassembled column and the original long-term elevation of the top of the to-be-disassembled column; b, a beam connected with the to-be-disassembled column serves as a first coaxial rebound beam, and a second coaxial rebound beam integrated with the first coaxial rebound beam is constructed; c, a lifting mechanism is used for applying upward lifting force to the outermost end of the second coaxial rebound beam, so that the top of the to-be-disassembled column is lifted upwards by a preset size; d, the to-be-disassembled column is disassembled, and upward lifting force is further applied to the outermost end of the second coaxial rebound beam through the lifting mechanism, so that the original column top position of the to-be-disassembled column is upwards lifted to the construction elevation; and E, a supporting component is poured at the outermost end of the second coaxial rebound beam, and the lifting mechanism is dismantled. It can be guaranteed to the maximum extent that in the process from dismantling of the to-be-dismantled column to building of the permanent supporting component, the structure above the original to-be-dismantled column is not cracked, and safety is high.

Description

Technical Field

[0001] The present invention relates to the field of construction, and more particularly to a method for reconstructing a supporting member of a multi-story building. Background Art

[0002] With the passage of time and the change of requirements, the original building may no longer meet the current usage needs. For example, there are a large number of columns in the original building, especially at the edge positions of the building, which makes it impossible to form a relatively large continuous space.

[0003] To increase the continuous space in the original building, some columns must be removed, such as Figure 1 the column 11 shown in the figure. However, the column is one of the key components for supporting the weight of the building, responsible for transferring the loads of the floor slab, beam and other structural elements to the foundation. During the removal of the column 11, it is usually necessary to set up temporary supports to transfer the loads originally borne by the column 11, and new structural elements such as beams, walls or other types of supporting structures need to be added to redistribute the loads to ensure the stability of the entire building structure after the original column is removed.

[0004] However, after the original column 11 is removed, the huge load will be instantly transferred to the temporary support member, causing the temporary support member to be compressed, and then resulting in a certain settlement of the full-height column 13 above the original column 11, and affecting the structures of the beam 12 and column 14 connected to the column 11, and even causing wall cracking and other situations. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for reconstructing a supporting member of a multi-story building in view of the problem that adjacent structures are prone to safety hazards during the reconstruction of a building, such as the removal of columns.

[0006] The technical solution of the present invention to solve the above technical problem is to provide a method for reconstructing a supporting member of a multi-story building for expanding the continuous space of the multi-story building. The method includes the following steps:

[0007] A. Establish a computer model according to the structural status of the multi-story building, and use the computer model to calculate the load of the column to be removed to obtain the top settlement amount of the column to be removed, and record the original long-term elevation of the top of the column to be removed;

[0008] B. Take the beam connected to the column to be removed on the side facing away from the outdoor space of the column to be removed as the first coaxial rebound beam, and construct a second coaxial rebound beam integrated with the first coaxial rebound beam in the outdoor space of the multi-story building. The second coaxial rebound beam has the same cross-section as the first coaxial rebound beam, and the centers of the second coaxial rebound beam and the first coaxial rebound beam are located on the same straight line;

[0009] C. Apply an upward lifting force at the outermost end of the second coaxial rebound beam using a lifting mechanism, so that the top of the column to be demolished is lifted upward by a preset dimension, and the preset dimension is 40%-60% of the settlement amount at the top of the column to be demolished;

[0010] D. Demolish the column to be demolished while maintaining the lifting force at the outermost end of the second coaxial rebound beam. After demolishing the column to be demolished, use the lifting mechanism to further apply an upward lifting force at the outermost end of the second coaxial rebound beam, so that the original column top position of the column to be demolished is lifted upward to a preset elevation. And after the original column top position of the column to be demolished reaches the preset elevation, the height of the original column top position of the column to be demolished is higher than the original long-term elevation of the column top of the column to be demolished;

[0011] E. Pour a support member at the outermost end of the second coaxial rebound beam, and after the concrete of the support member hardens, remove the lifting mechanism.

[0012] As a further improvement of the present invention, the step D includes:

[0013] D11. In the computer model, cancel the column to be demolished and add a hypothetical concentrated force load at the outermost end of the second coaxial rebound beam to obtain the calculated elevation of the original column top position of the column to be demolished, and the hypothetical concentrated force load is negative;

[0014] D12. In the computer model, adjust the hypothetical concentrated force load in a successive approximation manner, and obtain the calculated elevation of the original column top position of the column to be demolished under the corresponding hypothetical concentrated force load until the difference between the calculated elevation of the original column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished is within a preset range;

[0015] D13. Take the negative value of the hypothetical concentrated force load when the difference between the calculated elevation of the original column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished is within the preset range as the long-term rebound force at the outermost end of the second coaxial rebound beam, and take the bottom height of the outermost end of the second coaxial rebound beam under the long-term rebound force as the long-term elevation of the support member;

[0016] D14. Calculate the construction elevation of the support member according to the long-term rebound force, long-term elevation and design parameters of the support member;

[0017] D15. Demolish the column to be demolished, and use a lifting mechanism to apply a lifting force at the outermost end of the second coaxial rebound beam, so that the outermost end of the second coaxial rebound beam reaches the construction elevation, and further make the original column top position of the column to be demolished reach the preset elevation.

[0018] As a further improvement of the present invention, the step D includes:

[0019] D21. Apply an upward lifting force at the outermost end of the second coaxial rebound beam using a lifting mechanism, so that the original column top position of the column to be demolished is restored to the original long-term elevation, record the elevation at the bottom of the outermost end of the second coaxial rebound beam, and obtain the lifting force measurement value of the lifting mechanism when the original column top position of the column to be demolished is restored to the original long-term elevation through a pressure sensor;

[0020] D22. Take the elevation at the bottom of the outermost end of the second coaxial rebound beam when the original column top position of the column to be demolished is restored to the original long-term elevation as the long-term elevation of the support member, and take the lifting force measurement value as the long-term rebound force of the support member, and generate the construction elevation of the support member according to the long-term elevation, long-term rebound force and design parameters of the support member;

[0021] D23. Apply an upward lifting force at the outermost end of the second coaxial rebound beam using a lifting mechanism, so that the outermost end of the second coaxial rebound beam reaches the construction elevation, and further make the original column top position of the column to be demolished reach the preset elevation.

[0022] As a further improvement of the present invention, the support member is a coaxial post-cast column poured below the outermost end of the second coaxial rebound beam, and the construction elevation of the coaxial post-cast column satisfies the following calculation formula:

[0023]

[0024] Where Ht is the construction elevation of the coaxial post-cast column, H is the long-term elevation of the coaxial post-cast column, P is the long-term rebound force, E is the elastic modulus of the coaxial post-cast column, and A is the cross-sectional area of the coaxial post-cast column.

[0025] As a further improvement of the present invention, step C includes: constructing first double-convex lifting bars on both sides of the outermost end of the second coaxial rebound beam, and pouring a first foundation below the outermost end of the second coaxial rebound beam, and then using a steel column at each of two positions below the first double-convex lifting bars to jack up the end of the second coaxial rebound beam far from the column to be demolished, so that the first coaxial rebound beam and the second coaxial rebound beam apply an upward lifting force to the structure above the column to be demolished, and further lift the column top of the column to be demolished upward by a preset size. The bottom end of the steel column is supported on the first foundation, and a pressure sensor is provided at the top or bottom end of the steel column.

[0026] As a further improvement of the present invention, the method includes: obtaining the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam using a computer model;

[0027] When the required stiffness and strength exceed the original stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam, step B includes:

[0028] B1. A horizontal groove is machined on the side of the column to be demolished, and the horizontal groove is flush with the bottom surfaces of the first coaxial rebound beam and the second coaxial rebound beam;

[0029] B2. According to the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam, two continuous L-shaped section steel plates are added to the first coaxial rebound beam and the second coaxial rebound beam; the vertical parts of the two L-shaped section steel plates are respectively opposite to the two side surfaces of the first coaxial rebound beam and the second coaxial rebound beam, the horizontal parts of the two L-shaped section steel plates cover the bottoms of the first coaxial rebound beam and the second coaxial rebound beam, and at least a part of the horizontal parts of the two L-shaped section steel plates is embedded into the horizontal groove on the side of the column to be demolished;

[0030] B3. Reinforcing bars are installed and concrete is poured between the vertical parts of the two L-shaped section steel plates, or between the vertical parts of the two L-shaped section steel plates and the first coaxial rebound beam and the column to be demolished;

[0031] The step D includes: after demolishing the column to be demolished, welding steel plates at the positions corresponding to the column to be demolished on the horizontal parts of the two L-shaped section steel plates to block the gap formed by demolishing the column to be demolished.

[0032] As a further improvement of the present invention, the use of the computer model to obtain the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam includes:

[0033] B01. In the computer model, the column to be demolished is removed, and the calculated elevation of the original column top position of the column to be demolished is calculated after adding a hypothetical concentrated force load at the outermost end of the second coaxial rebound beam, and the hypothetical concentrated force load is negative;

[0034] B02. In the computer model, the design parameters of the first coaxial rebound beam and the second coaxial rebound beam, and the hypothetical concentrated force load are adjusted in a successive approximation manner, and the calculated elevation of the column top position of the column to be demolished, the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam are calculated under the corresponding hypothetical concentrated force load until the difference between the calculated elevation of the column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished reaches the preset range, and the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam meet the building code;

[0035] B03. Record the design parameters of the first coaxial rebound beam and the second coaxial rebound beam when the difference between the calculated elevation of the column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished reaches the preset range, and the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam meet the building code, and obtain the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam according to the design parameters.

[0036] As a further improvement of the present invention, step B includes: pouring a first off-axis rebound beam and a second off-axis rebound beam that are respectively perpendicular to the second coaxial rebound beam, and the first off-axis rebound beam and the second off-axis rebound beam are respectively connected to one end of the second coaxial rebound beam away from the column to be demolished;

[0037] Step C includes: forming second double-convex lifting bars on both sides of the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam respectively, and pouring a first off-axis foundation and a second off-axis foundation respectively below the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, and then using steel columns respectively below the second double-convex lifting bars to jack up the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, so that the first off-axis rebound beam, the second off-axis rebound beam, the first coaxial rebound beam, and the second coaxial rebound beam apply an upward lifting force to the structure above the column to be demolished, thereby lifting the top of the column to be demolished upward by a preset height. The bottom ends of the steel columns are respectively supported on the first off-axis foundation and the second off-axis foundation, and pressure sensors are provided at the top or bottom ends of the steel columns.

[0038] As a further improvement of the present invention, step D includes:

[0039] D31. Respectively use lifting mechanisms to apply upward lifting forces at the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, so that the original column top position of the column to be demolished is restored to the original long-term elevation, and obtain the lifting force measurement value of the lifting mechanism when the original column top position of the column to be demolished is restored to the original long-term elevation through the pressure sensor;

[0040] D32. Generate a construction elevation according to the lifting force measurement value and the design parameters of the first off-axis post-construction column and the second off-axis post-construction column to be built below the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, and respectively use lifting mechanisms to apply upward lifting forces at the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, so that the original column top position of the column to be demolished reaches the construction elevation;

[0041] Step E includes: pouring a first off-axis post-construction column and a second off-axis post-construction column for supporting the first off-axis rebound beam and the second off-axis rebound beam respectively on the first off-axis foundation and the second off-axis foundation, and the support members are composed of the first off-axis post-construction column and the second off-axis post-construction column.

[0042] As a further improvement of the present invention, the column to be demolished is located at the corner position of the multi-story building;

[0043] Step B includes: respectively taking the beams located on the side of the column to be demolished facing away from the outdoor space and connected to the column to be demolished as the first coaxial rebound beam and the third coaxial rebound beam, and constructing the second coaxial rebound beam and the fourth coaxial rebound beam in the outdoor space of the multi-story building. The second coaxial rebound beam and the fourth coaxial rebound beam are respectively connected to the column to be demolished. The second coaxial rebound beam has the same cross-section as the first coaxial rebound beam and is integrated with the first coaxial rebound beam. The fourth coaxial rebound beam has the same cross-section as the third coaxial rebound beam and is integrated with the third coaxial rebound beam. And the centers of the second coaxial rebound beam and the first coaxial rebound beam are on the same straight line, and the centers of the fourth coaxial rebound beam and the third coaxial rebound beam are on the same straight line;

[0044] Step C includes: respectively forming third double-convex lifting bars on both sides of the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, and respectively pouring the second foundation and the third foundation below the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam. Then, respectively using steel columns below the third double-convex lifting bars to jack up the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, so that the second coaxial rebound beam, the first coaxial rebound beam, the fourth coaxial rebound beam, and the third coaxial rebound beam apply an upward lifting force to the structure above the column to be demolished, thereby lifting the column top of the column to be demolished upward by a preset height. The bottom ends of the steel columns are respectively supported on the second foundation and the third foundation;

[0045] Step D includes:

[0046] D41. Respectively use lifting mechanisms to apply upward lifting forces at the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, so that the original column top position of the column to be demolished is restored to the original long-term elevation, and obtain the lifting force measurement values of the lifting mechanisms when the original column top position of the column to be demolished is restored to the original long-term elevation through pressure sensors;

[0047] D42. Generate construction elevations according to the lifting force measurement values and the design parameters of the first coaxial post-construction column and the second coaxial post-construction column to be built below the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, and respectively use lifting mechanisms to apply upward lifting forces at the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, so that the original column top position of the column to be demolished reaches the construction elevation;

[0048] Step E includes: respectively pouring the first coaxial post-construction column for supporting the second coaxial rebound beam and the second coaxial post-construction column for supporting the fourth coaxial rebound beam on the second foundation and the third foundation. The supporting members are composed of the first coaxial post-construction column and the second coaxial post-construction column.

[0049] The present invention has the following beneficial effects: By constructing a second coaxial rebound beam integrated with the first coaxial rebound beam and applying an upward lifting force to the outermost end of the second coaxial rebound beam multiple times before and after removing the column to be removed, the full-height column above the column to be removed is made to undergo small vertical movements multiple times, thereby ensuring that the structure above the original column to be removed does not crack during the process of removing the column to be removed until the permanent support member is completed, and the overall structure is stable and safe after renovation. Description of the Drawings

[0050] Figure 1 It is a schematic diagram of the current situation of the support structure of a multi-story building.

[0051] Figure 2 It is a schematic flowchart of the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0052] Figure 3 It is a schematic flowchart of the process of removing the column to be removed in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0053] Figure 4 It is a schematic diagram of constructing the second coaxial rebound beam and applying a lifting force at the end of the second coaxial rebound beam in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0054] Figure 5 It is a schematic diagram after the column to be removed is removed in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0055] Figure 6 It is a schematic diagram after a support member is poured at the outermost end of the second coaxial rebound beam in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0056] Figure 7 It is a schematic diagram of lifting the outermost end of the second coaxial rebound beam multiple times in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0057] Figure 8 It is a schematic diagram of strengthening the first coaxial rebound beam and the second coaxial rebound beam in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0058] Figure 9 It is a schematic diagram of the structure at the outermost end of the second coaxial rebound beam in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0059] Figure 10 It is a schematic diagram of applying an upward lifting force at the outermost end of the second coaxial rebound beam in the renovation method of the support member of a multi-story building provided by an embodiment of the present invention.

[0060] Figure 11It is a schematic diagram of reconstructing a multi-story building support member using the reconstruction method of the multi-story building support member provided by the embodiment of the present invention.

[0061] Figure 12 It is another schematic diagram of reconstructing a multi-story building support member using the reconstruction method of the multi-story building support member provided by the embodiment of the present invention. Detailed implementation manners

[0062] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0063] The reconstruction method of the multi-story building support member of the present invention is used to reconstruct the support member of a multi-story building to expand the continuous space of the multi-story building. The multi-story building can be a building with only multiple floors, such as a building with two to five floors, specifically can be a residential, commercial, office and public service building, etc. The reconstruction method of the multi-story building support member of the present invention forms a relatively large continuous space by demolishing the columns at the edges of the ground floor of the multi-story building, so that the internal space of the building is connected to the external space.

[0064] As Figure 2 shown, it is a schematic flowchart of the reconstruction method of the multi-story building support member of this embodiment. The method includes the following steps:

[0065] Step S21: Establish a computer model according to the structural status of the multi-story building, and use the computer model to calculate the load of the columns to be demolished to obtain the top settlement of the columns to be demolished, and record the original long-term elevation of the column tops of the columns to be demolished.

[0066] The above computer model includes Figure 1 the components (such as beams, columns, walls, floor slabs, etc.) of each part of the multi-story building in Figure 4As shown in the figure, all the sub-item coefficients set by the original software according to the conventional calculation are modified to 1, and the load standard combination calculation is carried out, that is, the top settlement of the column to be demolished 31 is calculated, and the original long-term elevation of the top of the column to be demolished 31 is recorded. The top settlement of the column to be demolished mentioned above, that is, in this multi-story building, the size of the column to be demolished 31 compressed under the action of the upper load (combined with the material, size and other parameter characteristics of the column to be demolished 31); the original long-term elevation of the top of the column to be demolished 31 refers to the position of the top of the column to be demolished 31 in the original structure of the multi-story building. The establishment of the above computer model and the calculation of the top settlement of the column to be demolished 31 can both adopt the conventional methods in this field, which will not be elaborated here.

[0067] Step S22: Combine Figure 4 As shown in the figure, the beam located on the side of the column to be demolished 31 facing away from the outdoor space and connected to the column to be demolished 31 is used as the first coaxial rebound beam 32, and the second coaxial rebound beam 33 integrated with the first coaxial rebound beam 32 is constructed in the outdoor space of the multi-story building. The second coaxial rebound beam 33 has the same cross-section as the first coaxial rebound beam 32 (that is, the shape and size of the cross-section are the same), and the centers of the second coaxial rebound beam 33 and the first coaxial rebound beam 32 are located on the same straight line.

[0068] The second coaxial rebound beam 33 can be cast with reinforced concrete, and the main reinforcement inside the second coaxial rebound beam 33 can be welded to the main reinforcement inside the first coaxial rebound beam 32, so that when the outermost end of the second coaxial rebound beam 33 (that is, the end far from the column to be demolished 31) is lifted upward, the first coaxial rebound beam 32 will also be lifted upward, and there is no fold angle at the connection between the first coaxial rebound beam 32 and the second coaxial rebound beam 33, as Figure 7 shown in the figure. The length of the second coaxial rebound beam 33 corresponds to the position of the permanent support member to be constructed later.

[0069] Step S23: Combine Figure 4 As shown in the figure, a lifting force is applied upward at the outermost end of the second coaxial rebound beam 33 by using a lifting mechanism, so that the top of the column to be demolished 31 is lifted upward by a preset size, and the preset size is 40%-60% of the top settlement of the column to be demolished 31. Those skilled in the art can understand that, as Figure 10 shown in the figure, before applying the upward lifting force at the outermost end of the second coaxial rebound beam 33 by using the lifting mechanism, the first foundation 37 needs to be built, the bottom of the lifting mechanism is supported on the first foundation 37, and the load-bearing capacity of the first foundation 37 needs to meet the mechanical requirements.

[0070] When an upward lifting force is applied to the outermost end of the second coaxial rebound beam 33, part of the load of the full-height column 34 above the column to be demolished 31 and the beams, walls, floor slabs, etc. connected thereto will be transferred to the first coaxial rebound beam 32, the second coaxial rebound beam 33 and the lifting mechanism. This will cause the first coaxial rebound beam 32 and the second coaxial rebound beam 33 to bend in an arc shape, as Figure 7 shown. At the same time, the load on the column to be demolished 31 will decrease, resulting in a smaller compression amount and a corresponding reduction in the settlement at its top. In this embodiment, when the upward lifting dimension of the top of the column to be demolished 31 reaches 40%-60% of the top settlement amount of the column to be demolished 31, the lifting mechanism is kept stationary to keep the position of the top of the column to be demolished 31 unchanged. In specific operations, the upward lifting height of the top of the column to be demolished 31 can be determined according to the storey height of the multi-storey building, the load above the column to be demolished 31, etc.

[0071] Combined with Figure 10 shown, the above-mentioned lifting mechanism can be a profiled steel column 35 with a length greater than the height of the column to be demolished 31 (the cross-sectional size of the profiled steel column 35 can be selected according to the load. For example, when the load above the column to be demolished 31 is large, the cross-section of the profiled steel column 35 can be larger). The profiled steel column 35 is inclined, and its top abuts against the bottom of the outermost end of the second coaxial rebound beam 33, and the bottom abuts against the first foundation 37 (the bottom of the profiled steel column 35 can have a structure convenient for sliding). By pushing the bottom of the profiled steel column 35 to move directly below the second coaxial rebound beam 33, an upward lifting force is applied to the outermost end of the second coaxial rebound beam 33. After the top of the column to be demolished 31 is lifted in place, the bottom of the profiled steel column 35 can be fixed. In practical applications, the lifting mechanism can also be combined with a jack, etc.

[0072] Step S24: As Figure 5 shown, the column to be demolished 31 is demolished while maintaining the lifting force at the outermost end of the second coaxial rebound beam 33. After the column to be demolished 31 is demolished, the lifting mechanism is used to further apply an upward lifting force at the outermost end of the second coaxial rebound beam 33, so that the original top position of the column to be demolished 31 is lifted upward to the preset elevation. And after the original top position of the column to be demolished 31 reaches the preset elevation, the height of the original top of the column to be demolished 31 is higher than the original permanent elevation of the top of the column to be demolished 31 (that is, before the second coaxial rebound beam 33 is constructed, the original top elevation of the column to be demolished 31).

[0073] In this step, after the column to be demolished 31 is removed, most of the load of the column to be demolished 31 will be loaded onto the lifting mechanism. When the lifting mechanism uses a steel column 35, due to its relatively small compression rate, before and after the column to be demolished 31 is removed, the length change of the steel column 35 is relatively small, which also makes the original column top position of the column to be demolished 31 (i.e., the connection position of the first coaxial rebound beam 32 and the second coaxial rebound beam 33) change relatively small. At the same time, since the column top position of the column to be demolished 31 has been lifted in step 23, before and after the column to be demolished 31 is removed, the displacement of the structure above the column to be demolished 31 is relatively small and will not cause destructive consequences.

[0074] Step S25: As Figure 6 shown, a support member 36 is cast at the outermost end of the second coaxial rebound beam, and after the concrete of the support member 36 hardens, the lifting mechanism is removed. Those skilled in the art can understand that the above support member 36 is cast on the first foundation 37.

[0075] Due to the material properties of the support member 36 itself, it will experience a certain amount of compression when subjected to a large load. In step S25, the original column top position of the column to be demolished 31 is lifted above its original long-term elevation. In this way, after the lifting mechanism is removed, the first coaxial rebound beam 32 and the second coaxial rebound beam 33 transfer the load to the support member 36, causing it to compress to a certain extent and making the outermost end of the second coaxial rebound beam 33 slightly lower, thereby making the original column top position of the column to be demolished 31 basically return to its original long-term elevation, completing the reconstruction of the support structure of the multi-story building.

[0076] The above method for reconstructing the support member of a multi-story building constructs a second coaxial rebound beam 33 integrated with the first coaxial rebound beam 32, and applies an upward lifting force to the outermost end of the second coaxial rebound beam 33 multiple times before and after the column to be demolished 31 is removed, so that the through-column 34 above the column to be demolished 31 moves vertically in small increments within the safety standard range multiple times, thereby ensuring the stability and safety of the structure above the original column to be demolished during the process of removing the column to be demolished to the completion of the permanent support member.

[0077] As Figure 3 shown, in an embodiment of the present invention, the above step S24 may specifically include:

[0078] Step S241: Use the lifting mechanism to apply an upward lifting force at the outermost end of the second coaxial rebound beam 33, so that the original column top position of the column to be demolished 31 is restored to the original long-term elevation, record the elevation of the bottom of the outermost end of the second coaxial rebound beam 33, and obtain the measured value of the lifting force of the lifting mechanism when the original column top position of the column to be demolished 31 is restored to the original long-term elevation through a pressure sensor.

[0079] For example, when the lifting mechanism uses a steel column 35, a pressure sensor may be provided at the top or bottom of the steel column 35. By reading the readings of the pressure sensor, the lifting force measurement value can be obtained.

[0080] Step S242: Take the elevation at the bottom of the outermost end of the second coaxial rebound beam 33 when the original column top position of the column to be demolished 31 is restored to the original long-term elevation as the long-term elevation of the support member, and take the above-mentioned lifting force measurement value as the long-term rebound force of the support member. Then, generate the construction elevation of the support member based on the long-term elevation, long-term rebound force, and design parameters of the support member to be constructed.

[0081] Step S243: Use the lifting mechanism to further apply an upward lifting force at the outermost end of the second coaxial rebound beam 33, so that the outermost end of the second coaxial rebound beam 33 reaches the construction elevation, and further make the original column top position of the column to be demolished 31 reach the preset elevation.

[0082] The design parameters of the support member to be constructed may specifically include materials, the shape and size of the cross-section, etc. Through these design parameters, the compression ratio (related to the elastic modulus) of the support member to be constructed can be obtained, so that the reserved compression amount can be obtained based on the lifting force measurement value and the compression ratio, and the construction elevation corresponds to the reserved compression amount.

[0083] In particular, as shown in Figure 7 , the support member 36 in step S25 is a coaxial post-cast column poured below the outermost end of the second coaxial rebound beam. That is, the long-term elevation of the support member is the long-term elevation of the coaxial post-cast column, and the long-term elevation of the support member is the long-term elevation of the coaxial post-cast column (that is, the elevation of the top of the coaxial post-cast column after the column to be demolished is removed), and the coaxial post-cast column satisfies the following calculation formula (1):

[0084]

[0085] Wherein, Ht is the construction elevation during the construction of the coaxial post-cast column (that is, before the lifting mechanism is removed), H is the long-term elevation of the coaxial post-cast column, P is the long-term rebound force, E is the elastic modulus of the coaxial post-cast column, and A is the cross-sectional area of the coaxial post-cast column. Figure 7 In

[0086] 33' in Figure 9 、 Figure 10As shown, to facilitate the use of the lifting mechanism to apply force to the outermost end of the second coaxial rebound beam 33 while not affecting the casting of the support member 36, in an embodiment of the present invention, the above step S23 further includes: constructing first double-convex lifting bars 331 on both sides of the outermost end of the second coaxial rebound beam 33 (in practical applications, the first double-convex lifting bars 331 can also be constructed simultaneously with the second coaxial rebound beam 33, such as casting simultaneously), and casting a first foundation 37 below the outermost end of the second coaxial rebound beam 33 (specific parameters of the first foundation 37 can be obtained through computer model calculation). Then, at two positions below each of the first double-convex lifting bars 331, use a steel column to jack up the end of the second coaxial rebound beam 33 far from the column to be demolished 31, so that the first coaxial rebound beam 32 and the second coaxial rebound beam 33 apply an upward axial force to the structure above the column to be demolished 31, thereby lifting the top of the column to be demolished 31 by a preset dimension. The bottom end of the above steel column is supported on the first foundation, and a pressure sensor is provided at the top or bottom end of the steel column.

[0087] In an embodiment of the present invention, Figure 2 Step S24 in can also be implemented in the following manner:

[0088] In the computer model established in step S21, cancel the column to be demolished and add an assumed concentrated force load at the outermost end of the second coaxial rebound beam 33, and then obtain the calculated elevation of the original column top position of the column to be demolished 31 at this time. The above assumed concentrated force load is negative (that is, the direction of the force is upward, and its magnitude can be set as the column top load of the original column to be demolished).

[0089] In the computer model, adjust the assumed concentrated force load in a successive approximation manner, and calculate the calculated elevation of the original column top position of the column to be demolished 31 under the corresponding assumed concentrated force load until the difference between the calculated elevation of the original column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished is within a preset range (such as 1 mm or other values that conform to building codes); when adjusting the assumed concentrated force load, the adjustment value of the assumed concentrated force load can be determined according to the value of the calculated elevation of the original column top position of the column to be demolished 31, so as to accelerate the approximation process.

[0090] Take the negative value of the assumed concentrated force load when the difference between the calculated elevation of the original column top position of the column to be demolished 31 and the original long-term elevation of the column top of the column to be demolished is within the preset range as the long-term rebound force at the outermost end of the second coaxial rebound beam 33. This long-term rebound force is the long-term pressure borne by the support member 36 after removing the lifting mechanism in step S25. At the same time, take the bottom height of the outermost end of the second coaxial rebound beam under the above long-term rebound force as the long-term elevation of the support member.

[0091] Calculate the construction elevation of the support member according to the above long-term rebound force, long-term elevation and design parameters of the support member.

[0092] Then, at the construction site, the column to be demolished is removed, and a lifting force is applied at the outermost end of the second coaxial rebound beam 33 using a lifting mechanism, so that the outermost end of the second coaxial rebound beam 33 reaches the construction elevation, and further the original column top position of the column to be demolished 31 reaches the preset elevation.

[0093] This solution does not require sensors and can complete the construction only through computer model calculation, reducing the requirements for construction equipment.

[0094] To improve the structural safety, in an embodiment of the present invention, before step S23, it further includes: obtaining the gravity load of the full-height column 34 above the column to be demolished 31 (corresponding to the axial force provided by the column to be demolished 31) using a computer model, as well as the required stiffness and strength of the first coaxial rebound beam 32 and the second coaxial rebound beam 33. The required stiffness and strength of the first coaxial rebound beam 32 and the second coaxial rebound beam 33 are related to their materials, cross-sectional dimensions, etc., and the calculation method can adopt the conventional solutions in the art. Moreover, the above-mentioned first foundation for supporting the lifting mechanism and the support member 36 can also be designed and constructed according to the above gravity load.

[0095] When the calculated required stiffness and strength of the first coaxial rebound beam 32 and the second coaxial rebound beam 33 exceed the original stiffness and strength of the first coaxial rebound beam 32 and the second coaxial rebound beam 33, it is also necessary to reinforce the first coaxial rebound beam 32 and the second coaxial rebound beam 33. That is, the above step S23 further includes: machining a horizontal groove on the side of the column to be demolished 31 (the depth of the horizontal groove can be designed as needed, for example, reaching the main reinforcement of the column to be demolished 31), and the horizontal groove is flush with the bottom surfaces of the first coaxial rebound beam 32 and the second coaxial rebound beam 33; as Figure 8 shown, according to the required stiffness and strength of the first coaxial rebound beam 32 and the second coaxial rebound beam 33, two full-length L-shaped section steel plates 38 are added to the first coaxial rebound beam 32 and the second coaxial rebound beam 33; the vertical parts of the two L-shaped section steel plates 38 are respectively opposite to the two side surfaces of the first coaxial rebound beam 32 and the second coaxial rebound beam 33 (the spacing between the vertical parts of the L-shaped section steel plates 38 and the two side surfaces of the first coaxial rebound beam 32 and the second coaxial rebound beam 33 is designed according to the required stiffness and strength), the horizontal parts of the two L-shaped section steel plates 38 cover the bottoms of the first coaxial rebound beam 32 and the second coaxial rebound beam 33, and at least a part of the horizontal parts of the two L-shaped section steel plates 38 is embedded in the horizontal groove on the side of the column to be demolished 31; between the vertical parts of the two L-shaped section steel plates 38 (i.e., the second coaxial rebound beam part), and between the vertical parts of the two L-shaped section steel plates 38 and the first coaxial rebound beam 32 and the column to be demolished 31, steel bars are installed and concrete is poured.

[0096] In the above manner, the first coaxial rebound beam 32 and the second coaxial rebound beam 33 can meet the requirements for the subsequent lifting operation of the outermost end of the second coaxial rebound beam 33, and at the same time meet the structural stability requirements of a multi-story building after the columns are constructed coaxially for the members.

[0097] Specifically, the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam can be obtained in the following manner: First, revoke the column to be demolished in the computer model, and calculate the calculated elevation of the original column top position of the column to be demolished after adding a hypothetical concentrated force load (negative value, and its magnitude can be set as the gravity load of the full-height column 34) at the outermost end of the second coaxial rebound beam 33; Then, in the computer model, adjust the design parameters (such as cross-sectional dimensions) of the first coaxial rebound beam 32 and the second coaxial rebound beam 33 and the hypothetical concentrated force load in a successive approximation manner, and calculate the calculated elevation of the column top position of the column to be demolished, the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam under the corresponding hypothetical concentrated force load, until the difference between the calculated elevation of the column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished reaches a preset range (such as 1 mm or other values that comply with building codes), and at the same time the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam comply with building codes; Finally, record the design parameters of the first coaxial rebound beam and the second coaxial rebound beam when the difference between the calculated elevation of the column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished reaches the preset range, and the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam comply with building codes, and obtain the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam according to the design parameters.

[0098] Correspondingly, step S24 includes: after demolishing the column to be demolished 31, welding steel plates at the positions corresponding to the column to be demolished on the transverse parts of the two L-shaped section steel plates to block the gap formed by demolishing the column to be demolished 31.

[0099] As Figure 11 shown, in an embodiment of the present invention, the above step S22 may further include: pouring a first non-coaxial rebound beam 41 and a second non-coaxial rebound beam 42 that are perpendicular to the second coaxial rebound beam 33 respectively, and the first non-coaxial rebound beam 41 and the second non-coaxial rebound beam 42 are respectively connected to the end of the second coaxial rebound beam 33 far from the column to be demolished 31.

[0100] Accordingly, the above-mentioned step S23 includes: forming second double-convex lifting bars on both sides of the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42 respectively, and pouring the first off-axis foundation and the second off-axis foundation under the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42 respectively. Then, steel columns are used under the second double-convex lifting bars to jack up the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42, so that the first off-axis rebound beam 41, the second off-axis rebound beam 42, the first coaxial rebound beam 32, and the second coaxial rebound beam 33 apply an upward lifting force to the structure above the column to be demolished 31, thereby lifting the top of the column to be demolished 31 upward by a preset height. The bottom ends of the steel columns are respectively supported on the first off-axis foundation and the second off-axis foundation. Those skilled in the art can understand that in order to make the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42 at the same elevation, the lifting forces applied to the first off-axis rebound beam 41 and the second off-axis rebound beam 42 are proportional to the lengths of the first off-axis rebound beam 41 and the second off-axis rebound beam 42.

[0101] Accordingly, the above-mentioned step S24 includes: using lifting mechanisms to apply upward lifting forces to the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42 respectively, so that the original column top position of the column to be demolished 31 is restored to the original long-term elevation, and obtaining the lifting force measurement value of the lifting mechanism when the original column top position of the column to be demolished 31 is restored to the original long-term elevation through a pressure sensor; then generating a construction elevation according to the lifting force measurement value and the design parameters of the first off-axis post to be built 43 and the second off-axis post to be built 44 to be built under the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42, and using the lifting mechanisms to apply upward lifting forces to the outermost ends of the first off-axis rebound beam 41 and the second off-axis rebound beam 42 respectively, so that the original column top position of the column to be demolished 31 reaches the construction elevation.

[0102] Accordingly, step S25 includes: pouring the first off-axis post to be built 43 and the second off-axis post to be built 44 for supporting the first off-axis rebound beam 41 and the second off-axis rebound beam 42 on the first off-axis foundation and the second off-axis foundation respectively, that is, the support member 36 is composed of the first off-axis post to be built 43 and the second off-axis post to be built 44.

[0103] As Figure 12As shown, in an embodiment of the present invention, when the column to be demolished 31 is located at the corner position of a multi-story building, the above step S22 may further include: respectively taking the beams located on the side of the column to be demolished 31 facing away from the outdoor space and connected to the column to be demolished 31 as the first coaxial rebound beam 32 and the third coaxial rebound beam 51, and constructing a second coaxial rebound beam 33 and a fourth coaxial rebound beam 52 in the outdoor space of the multi-story building, wherein the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52 are respectively connected to the column to be demolished 31, the second coaxial rebound beam 33 has the same cross-section as the first coaxial rebound beam 32 and is integrated with the first coaxial rebound beam 32, the fourth coaxial rebound beam 52 has the same cross-section as the third coaxial rebound beam 51 and is integrated with the third coaxial rebound beam 51, and the centers of the second coaxial rebound beam 33 and the first coaxial rebound beam 32 are located on the same straight line, and the centers of the fourth coaxial rebound beam 52 and the third coaxial rebound beam 51 are located on the same straight line.

[0104] Correspondingly, step S23 includes: respectively forming third double-convex lifting bars on both sides of the outermost ends of the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52, and respectively pouring a second foundation and a third foundation below the outermost ends of the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52, and then respectively using steel columns below the third double-convex lifting bars to jack up the outermost ends of the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52, so that the second coaxial rebound beam 33, the first coaxial rebound beam 32, the fourth coaxial rebound beam 52, and the third coaxial rebound beam 51 apply an upward lifting force to the structure above the column to be demolished 31, thereby lifting the column top of the column to be demolished 31 upward by a preset height, and the bottom ends of the steel columns are respectively supported on the second foundation and the third foundation;

[0105] Correspondingly, step S24 includes: respectively using a lifting mechanism to apply an upward lifting force at the outermost ends of the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52, so that the original column top position of the column to be demolished 31 is restored to the original long-term elevation, and obtaining the lifting force measurement value of the lifting mechanism when the original column top position of the column to be demolished 31 is restored to the original long-term elevation through a pressure sensor; generating a construction elevation according to the above lifting force measurement value and the design parameters of the first coaxial post-construction column 53 and the second coaxial post-construction column 54 to be built below the outermost ends of the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52, and respectively using the lifting mechanism to apply an upward lifting force at the outermost ends of the second coaxial rebound beam 33 and the fourth coaxial rebound beam 52, so that the original column top position of the column to be demolished 31 reaches the construction elevation.

[0106] Correspondingly, step S25 includes: respectively pouring a first coaxial post-construction column 53 for supporting the second coaxial rebound beam 33 and a second coaxial post-construction column 54 for supporting the fourth coaxial rebound beam 52 on the second foundation and the third foundation, and the supporting members are composed of the first coaxial post-construction column 53 and the second coaxial post-construction column 54.

[0107] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for reconstructing a support member of a multi-story building, which is used to expand the continuous space of the multi-story building, characterized in that, The method includes the following steps: A. Establish a computer model according to the structural status of the multi-story building, and use the computer model to calculate the load of the column to be demolished to obtain the top settlement of the column to be demolished, and record the original long-term elevation of the top of the column to be demolished; B. Take the beam located on the side of the column to be demolished facing away from the outdoor space and connected to the column to be demolished as the first coaxial rebound beam, and construct a second coaxial rebound beam integrated with the first coaxial rebound beam in the outdoor space of the multi-story building. The second coaxial rebound beam has the same cross-section as the first coaxial rebound beam, and the centers of the second coaxial rebound beam and the first coaxial rebound beam are on the same straight line; C. Use a lifting mechanism to apply an upward lifting force at the outermost end of the second coaxial rebound beam, so that the top of the column to be demolished is lifted upward by a preset size, and the preset size is 40%-60% of the top settlement of the column to be demolished; D. Demolish the column to be demolished while maintaining the lifting force at the outermost end of the second coaxial rebound beam. After demolishing the column to be demolished, use a lifting mechanism to further apply an upward lifting force at the outermost end of the second coaxial rebound beam, so that the original column top position of the column to be demolished is lifted upward to a preset elevation. And after the original column top position of the column to be demolished reaches the preset elevation, the height of the original column top position of the column to be demolished is higher than the original long-term elevation of the top of the column to be demolished; E. Pour a support member at the outermost end of the second coaxial rebound beam, and after the concrete of the support member hardens, remove the lifting mechanism.

2. The method for reconstructing a multi-story building support member according to claim 1, characterized in that The step D includes: D11. In the computer model, cancel the column to be demolished and add a hypothetical concentrated force load at the outermost end of the second coaxial rebound beam to obtain the calculated elevation of the original column top position of the column to be demolished, and the hypothetical concentrated force load is negative; D12. In the computer model, adjust the hypothetical concentrated force load in a successive approximation manner, and obtain the calculated elevation of the original column top position of the column to be demolished under the corresponding hypothetical concentrated force load until the difference between the calculated elevation of the original column top position of the column to be demolished and the original long-term elevation of the top of the column to be demolished is within a preset range; D13. Take the negative value of the hypothetical concentrated force load when the difference between the calculated elevation of the original column top position of the column to be demolished and the original long-term elevation of the top of the column to be demolished is within the preset range as the long-term rebound force at the outermost end of the second coaxial rebound beam, and take the bottom height of the outermost end of the second coaxial rebound beam under the long-term rebound force as the long-term elevation of the support member; D14. Calculate the construction elevation of the support member according to the long-term rebound force, long-term elevation and design parameters of the support member; D15. Demolish the column to be demolished, and use a lifting mechanism to apply a lifting force at the outermost end of the second coaxial rebound beam, so that the outermost end of the second coaxial rebound beam reaches the construction elevation, and further make the original column top position of the column to be demolished reach the preset elevation.

3. The method for reconstructing a multi-story building support member according to claim 1, characterized in that, The step D includes: D21. Apply an upward lifting force at the outermost end of the second coaxial rebound beam using a lifting mechanism, so that the original column top position of the column to be demolished is restored to the original long-term elevation, record the elevation at the bottom of the outermost end of the second coaxial rebound beam, and obtain the lifting force measurement value of the lifting mechanism when the original column top position of the column to be demolished is restored to the original long-term elevation through a pressure sensor; D22. Take the elevation at the bottom of the outermost end of the second coaxial rebound beam when the original column top position of the column to be demolished is restored to the original long-term elevation as the long-term elevation of the support member, and take the lifting force measurement value as the long-term rebound force of the support member, and generate the construction elevation of the support member according to the long-term elevation, long-term rebound force and design parameters of the support member; D23. Apply an upward lifting force at the outermost end of the second coaxial rebound beam using a lifting mechanism, so that the outermost end of the second coaxial rebound beam reaches the construction elevation, and further make the original column top position of the column to be demolished reach the preset elevation.

4. The method for reconstructing a multi-story building support member according to claim 2 or 3, characterized in that The support member is a coaxial post-cast column cast below the outermost end of the second coaxial rebound beam, and the construction elevation of the coaxial post-cast column satisfies the following calculation formula: Ht = H×(P + 1) E×A Where Ht is the construction elevation of the coaxial post-cast column, H is the long-term elevation of the coaxial post-cast column, P is the long-term rebound force, E is the elastic modulus of the coaxial post-cast column, and A is the cross-sectional area of the coaxial post-cast column.

5. The method for reconstructing a multi-story building support member according to claim 4, characterized in that, The step C includes: constructing first double-convex lifting bars on both sides of the outermost end of the second coaxial rebound beam, and casting a first foundation below the outermost end of the second coaxial rebound beam, and then using a steel column at each of two positions below the first double-convex lifting bars to jack up the end of the second coaxial rebound beam far from the column to be demolished, so that the first coaxial rebound beam and the second coaxial rebound beam apply an upward lifting force to the structure above the column to be demolished, and further lift the column top of the column to be demolished upward by a preset dimension. The bottom end of the steel column is supported on the first foundation, and a pressure sensor is provided at the top or bottom end of the steel column.

6. The method for reconstructing a multi-story building support member according to claim 2 or 3, characterized in that, The method includes: obtaining the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam using a computer model; When the required stiffness and strength exceed the original stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam, the step B includes: B1. Process a horizontal groove on the side of the column to be demolished, and the horizontal groove is flush with the bottom surfaces of the first coaxial rebound beam and the second coaxial rebound beam; B2. According to the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam, add two continuous L-shaped section steel plates to the first coaxial rebound beam and the second coaxial rebound beam; the vertical parts of the two L-shaped section steel plates are respectively opposite to the two side surfaces of the first coaxial rebound beam and the second coaxial rebound beam, the horizontal parts of the two L-shaped section steel plates cover the bottoms of the first coaxial rebound beam and the second coaxial rebound beam, and at least a part of the horizontal parts of the two L-shaped section steel plates is embedded into the horizontal groove on the side of the column to be demolished; B3. Install steel bars and pour concrete between the vertical parts of two L-shaped section steel plates, or between the vertical parts of two L-shaped section steel plates and the first coaxial rebound beam and the column to be demolished. The said step D includes: after demolishing the column to be demolished, weld steel plates at the positions corresponding to the column to be demolished on the transverse parts of two L-shaped section steel plates to block the gap formed by demolishing the column to be demolished.

7. The method for reconstructing a multi-story building support member according to claim 6, characterized in that The use of the computer model to obtain the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam includes: B01. In the computer model, cancel the column to be demolished, and calculate the calculated elevation of the original column top position of the column to be demolished after adding a hypothetical concentrated force load at the outermost end of the second coaxial rebound beam, and the hypothetical concentrated force load is negative. B02. In the computer model, adjust the design parameters of the first coaxial rebound beam and the second coaxial rebound beam, and the hypothetical concentrated force load in a successive approximation manner, and calculate the calculated elevation of the column top position of the column to be demolished, the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam under the corresponding hypothetical concentrated force load, until the difference between the calculated elevation of the column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished reaches the preset range, and the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam meet the building codes. B03. Record the design parameters of the first coaxial rebound beam and the second coaxial rebound beam when the difference between the calculated elevation of the column top position of the column to be demolished and the original long-term elevation of the column top of the column to be demolished reaches the preset range, and the strength and bending degree of the first coaxial rebound beam and the second coaxial rebound beam meet the building codes, and obtain the required stiffness and strength of the first coaxial rebound beam and the second coaxial rebound beam according to the design parameters.

8. The method for reconstructing a multi-story building support member according to claim 1, characterized in that, The said step B includes: pouring the first off-axis rebound beam and the second off-axis rebound beam perpendicular to the second coaxial rebound beam respectively, and the first off-axis rebound beam and the second off-axis rebound beam are respectively connected to the end of the second coaxial rebound beam far from the column to be demolished. The said step C includes: forming second double-convex lifting bars on both sides of the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam respectively, and pouring the first off-axis foundation and the second off-axis foundation respectively under the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, and then use steel columns under the second double-convex lifting bars to jack up the outermost ends of the first off-axis rebound beam and the second off-axis rebound beam, so that the first off-axis rebound beam, the second off-axis rebound beam, the first coaxial rebound beam, and the second coaxial rebound beam exert an upward lifting force on the structure above the column to be demolished, thereby lifting the column top of the column to be demolished upward by a preset height. The bottom ends of the steel columns are respectively supported on the first off-axis foundation and the second off-axis foundation, and pressure sensors are provided at the top or bottom ends of the steel columns.

9. The method for reconstructing a multi-story building support member according to claim 8, characterized in that The said step D includes: D31. Apply upward lifting forces to the outermost ends of the first eccentric rebound beam and the second eccentric rebound beam respectively using a lifting mechanism, so that the original column top position of the column to be demolished is restored to the original long-term elevation, and obtain the measured lifting force value of the lifting mechanism when the original column top position of the column to be demolished is restored to the original long-term elevation through a pressure sensor; D32. Generate a construction elevation based on the measured lifting force value and the design parameters of the first eccentric post to be built and the second eccentric post to be built that are to be constructed under the outermost ends of the first eccentric rebound beam and the second eccentric rebound beam, and apply upward lifting forces to the outermost ends of the first eccentric rebound beam and the second eccentric rebound beam respectively using a lifting mechanism, so that the original column top position of the column to be demolished reaches the construction elevation; The step E includes: pouring the first eccentric post to be built and the second eccentric post to be built for supporting the first eccentric rebound beam and the second eccentric rebound beam on the first eccentric foundation and the second eccentric foundation respectively, and the supporting members are composed of the first eccentric post to be built and the second eccentric post to be built.

10. The method for reconstructing a multi-story building support member according to claim 1, characterized in that, The column to be demolished is located at the corner position of the multi-story building; The step B includes: respectively taking the beams located on the side of the column to be demolished facing away from the outdoor space and connected to the column to be demolished as the first coaxial rebound beam and the third coaxial rebound beam, and constructing the second coaxial rebound beam and the fourth coaxial rebound beam in the outdoor space of the multi-story building. The second coaxial rebound beam and the fourth coaxial rebound beam are respectively connected to the column to be demolished. The second coaxial rebound beam has the same cross-section as the first coaxial rebound beam and is integrated with the first coaxial rebound beam. The fourth coaxial rebound beam has the same cross-section as the third coaxial rebound beam and is integrated with the third coaxial rebound beam. And the centers of the second coaxial rebound beam and the first coaxial rebound beam are on the same straight line, and the centers of the fourth coaxial rebound beam and the third coaxial rebound beam are on the same straight line; The step C includes: forming third double-convex lifting bars on both sides of the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam respectively, and pouring the second foundation and the third foundation under the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam respectively. Then use steel columns under the third double-convex lifting bars to jack up the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, so that the second coaxial rebound beam, the first coaxial rebound beam, the fourth coaxial rebound beam, and the third coaxial rebound beam apply upward lifting forces to the structure above the column to be demolished, thereby lifting the column top of the column to be demolished upward by a preset height, and the bottom ends of the steel columns are respectively supported on the second foundation and the third foundation; The step D includes: D41. Apply upward lifting forces to the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam respectively using a lifting mechanism, so that the original column top position of the column to be demolished is restored to the original long-term elevation, and obtain the measured lifting force value of the lifting mechanism when the original column top position of the column to be demolished is restored to the original long-term elevation through a pressure sensor; D42. Generate the construction elevation based on the measured lifting force value and the design parameters of the first coaxial post to be built and the second coaxial post to be built that are intended to be constructed below the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, and respectively use the lifting mechanism to apply an upward lifting force at the outermost ends of the second coaxial rebound beam and the fourth coaxial rebound beam, so that the original column top position of the column to be demolished reaches the construction elevation; The step E includes: pouring the first coaxial post to be built for supporting the second coaxial rebound beam and the second coaxial post to be built for supporting the fourth coaxial rebound beam on the second foundation and the third foundation respectively, and the support member is composed of the first coaxial post to be built and the second coaxial post to be built.

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