Non-destructive structural alteration device and method

Abstract

The application relates to the technical field of building construction, in particular to a non-destructive structure dismantling and reconstruction construction device and method, which comprises a fixed frame two, a fixed frame one and a structure plate, the fixed frame two is connected with a bidirectional screw rod two and a motor two; the fixed frame one is connected with a motor one and a bidirectional screw rod one, the bidirectional screw rod one is provided with a plug-in rod and a limiting plate, and the limiting plate is connected with a pulling block; the beneficial effects are that whether the existing structure is consistent with the original drawing is directly analyzed through 3D scanning, and on-site management of construction personnel is facilitated; the structure is non-destructive, high in mechanization, low in noise, free of dust and waste gas pollution, labor is reduced, construction efficiency is improved, safety is ensured through structure load theoretical calculation and finite element simulation analysis, simulation construction calculation is carried out on the dismantling process; the back-jacking support frame of the dismantled beam plate supports the support frame according to the newly-built building, the support frame can be converted into a formwork support frame of the newly-built structure after simple adjustment of the frame body after dismantling, so that construction time and construction cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a non-destructive structural demolition and alteration construction device and method. Background Technology

[0002] With the rapid pace of urbanization and the ever-changing urban construction, reinforced concrete cutting technology is becoming increasingly important. In large cities, some existing buildings have exceeded their service life, some abandoned projects are being restarted, and some buildings require changes to their functions. Structural reinforcement is needed for certain areas of these buildings, and the choice of structural modification scheme directly affects not only the safety of the existing structure but also the amount of capital required.

[0003] In existing technologies, a reasonable demolition and renovation plan must simultaneously meet the characteristics of safety, minimal impact on existing buildings, reliable technology, simple construction, economic rationality, and compliance with regulations regarding construction noise and dust. However, if the traditional method of blindly carrying out demolition and renovation is adopted, it will result in high noise and dust levels, affecting the lives of surrounding residents. Furthermore, violent demolition cannot guarantee the safety of the existing structure, which may lead to uncontrollable displacement or settlement, and it will fail to meet the requirements for protecting the existing structure. Summary of the Invention

[0004] The purpose of this invention is to provide a non-destructive structural demolition and alteration construction device to solve the problems mentioned in the background art, such as the construction method of blindly carrying out demolition and alteration in the traditional way, which will result in high noise and dust, affecting the lives of surrounding residents, and the inability to guarantee the safety of the existing structure by violent demolition, which will cause uncontrollable displacement or settlement, and cannot meet the requirements for protecting the finished product of the existing structure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a non-destructive structural demolition and alteration construction device, the non-destructive structural demolition and alteration construction device comprising: A second fixed frame is provided, with lifting rings on the upper sides of both ends of the second fixed frame. A second bidirectional lead screw is provided inside the second fixed frame, and a second motor is connected to the second fixed frame. Fixed frame 1, provided in pairs, the two fixed frames 1 are located on one side of fixed frame 2, each fixed frame 1 is connected to motor 1, double-acting lead screw 1 and adjusting block 2, the double-acting lead screw 1 is connected to adjusting block 1, the adjusting block 1 is provided with a plug rod and a limiting plate on one side, and the limiting plate is connected to a pull block; A structural plate is connected to a plug rod. The structural plate is connected to a main beam and a secondary beam. The main beam is connected to a support column.

[0006] Preferably, the support column is fixedly connected to the main beam, the main beam is fixedly connected to the secondary beam, a dividing line is provided between the secondary beam and the structural plate, and lifting holes are provided around the side wall of the structural plate.

[0007] Preferably, one end of the insertion rod has an insertion hole on its outer wall, and the other end of the insertion rod passes through the lifting hole and is fixedly connected to the adjusting block.

[0008] Preferably, one side wall of the limiting plate is fixedly connected to the pull block, the pull block has an arc-shaped groove at one end near the insertion rod, and the limiting plate is detachably connected to the lifting hole.

[0009] Preferably, one end sidewall of the fixed frame is fixedly connected to the motor, and the upper middle sidewall of the fixed frame is fixedly connected to the adjusting block.

[0010] Preferably, the output end of the motor is fixedly connected to one end of the bidirectional lead screw through one side wall of the fixed frame, the other end of the bidirectional lead screw is rotatably connected to the inner wall of the fixed frame, and the outer wall of the bidirectional lead screw is threadedly connected to one side wall of the adjusting block.

[0011] Preferably, one end of the fixed frame two is fixedly connected to the motor two, the output end of the motor two passes through the side wall of the fixed frame two and is fixedly connected to one end of the bidirectional lead screw two, the other end of the bidirectional lead screw two is rotatably connected to the inner wall of the fixed frame two, the outer wall of the bidirectional lead screw two is threadedly connected to one side wall of the adjusting block, and the upper side wall of the fixed frame two is fixedly connected to the lifting ring.

[0012] A construction method for a non-destructive structural demolition and alteration construction device as described above includes the following steps: S1: To determine the demolition area, the area to be modified should be reasonably analyzed based on the original structural drawings and the modified structural drawings, and the area to be modified should be marked on the drawings and at the construction site. S2: 3D scanning and model generation. After the drawings and the site are confirmed to be consistent, a 3D scanner is used to scan the demolition and modification area. By changing the position and switching between near and far distances for scanning multiple times, an accurate on-site real-world image can be obtained, which in turn generates a 3D BIM model drawing that can be viewed on a mobile phone for convenient on-site construction confirmation. S3: Regarding the selection of the demolition plan, in order to avoid the noise and dust generated during the demolition process from causing adverse effects on the surrounding environment and residents, and considering the potential damage to the structures to be preserved during the demolition process, the entire demolition project will be carried out using non-destructive static demolition methods. S4: Demolition and back-top scheme. Considering that the existing structural beams and slabs need to be supported and back-topped during static demolition, and that the subsequent new construction also needs to erect a formwork frame, the new structural model is compared with the existing structural real scene model by superimposing them. S5: The static cutting approach should be followed along the direction of structural demolition during the demolition process; S6: Static cutting of plates ① Positioning and layout: First, based on the panel's segment size and the position of the support frame uprights, position the panel's cutting seam to be divided into segments. Use a chalk line to mark the lines and determine the segment cutting position to ensure the accuracy of the segment cutting position. ② Drilling holes for hoisting: Use a water drill to drill holes for hoisting to ensure that the demolished concrete can be safely hoisted; ③ Segmented Cutting: The diamond circular saw cuts the structural panel into segments along the positioning line of the cutting seam and in the cutting sequence. ④ Lifting and transport: After the four sides of the plate are cut off, the lifting assembly is passed through the lifting hole and lifted by a truck crane to the flatbed truck for transport. S7: Beam Static Cutting Construction ① Positioning and layout: First, based on the segmented dimensions of the beam and the positions of the support frame uprights and square timber, position the beam to be segmented and cut. Use a chalk line to mark the lines to determine the segmented cutting positions and ensure the accuracy of the segmented cutting positions. ② Segmented cutting: The wire saw is used to segment the structural beam along the positioning line of the cutting seam and in the cutting sequence; ③ Lifting point setting: Manually chisel out grooves at the 100mm reserved plate on the side of the beam to ensure that the concrete blocks can be safely lifted; ④ After the beam is cut off at both ends, the hoisting components are passed through the bottom of the beam and lifted by a truck crane to a flatbed truck for transport. S8: Construction of new structures.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 3D scanning allows for a more intuitive analysis of whether the existing structure matches the original drawings, facilitating on-site management by construction personnel. Non-destructive structural construction is highly mechanized, reducing labor costs and increasing construction efficiency. Furthermore, the construction process is environmentally friendly and pollution-free, promoting civilized construction practices. It is characterized by low noise and no dust or exhaust pollution, offering unparalleled advantages over traditional construction methods. Through structural load theory calculations and finite element simulation analysis, the demolition process is simulated to ensure safety. The support frame for demolished beams and slabs is erected according to the new building's support frame specifications. After demolition, simple adjustments to the frame allow it to be converted into a formwork support frame for the new structure, reducing construction time and costs by minimizing the time spent installing and dismantling the frame. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure for removing the structural plate of the present invention; Figure 3 This is a schematic diagram of the secondary beam segmented removal structure of the present invention; Figure 4 This is a schematic diagram of the hoisting of the structural plate of the present invention; Figure 5This is a schematic diagram of the hoisting assembly of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 7 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B; Figure 8 This is a schematic diagram of the operation process of the present invention; Figure 9 This is a schematic diagram of the cutting sequence and dividing line position of the first type of column spacing plate according to the present invention; Figure 10 This is a schematic diagram of the cutting sequence and dividing line position of the second type of column spacing plate according to the present invention; In the diagram: 1. Main beam; 2. Secondary beam; 3. Structural slab; 4. Dividing line; 5. Column; 6. Insert rod; 7. Motor 1; 8. Fixing frame 1; 9. Fixing frame 2; 10. Lifting ring; 11. Motor 2; 12. Lifting hole; 13. Two-way lead screw 1; 14. Arc groove; 15. Pull block; 16. Insertion hole; 17. Adjusting block 1; 18. Limiting plate; 19. Adjusting block 2; 20. Two-way lead screw 2. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other. Example

[0019] Please see Figures 1 to 10 This invention provides a technical solution: a non-destructive structural demolition and alteration construction device, which includes: Fixed frame 2 9, with lifting rings 10 on the upper sides of both ends of fixed frame 2 9, and a two-way screw 20 inside fixed frame 2 9, and a motor 2 11 connected to fixed frame 2 9; Fixed frame 1 8 is provided in pairs. The two fixed frames 1 8 are located on one side of fixed frame 2 9. Each fixed frame 1 8 is connected to motor 1 7, double-acting screw 1 13 and adjusting block 2 19. Double-acting screw 1 13 is connected to adjusting block 1 17. Adjusting block 1 17 is provided with insert rod 6 and limiting plate 18 on one side. Limiting plate 18 is connected to pull block 15. Structural plate 3 is connected to insert rod 6. Structural plate 3 is connected to main beam 1 and secondary beam 2. Main beam 1 is connected to support column 5. Example

[0020] Based on Embodiment 1, in order to prevent objects from falling off during hoisting, the support column 5 is fixedly connected to the main beam 1, the main beam 1 is fixedly connected to the secondary beam 2, a dividing line 4 is provided between the secondary beam 2 and the structural plate 3, and hoisting holes 12 are provided around the side wall of the structural plate 3; a hole 16 is provided on the outer wall of one end of the insertion rod 6, and the other end of the insertion rod 6 passes through the hoisting hole 12 and is fixedly connected to the adjusting block 17; a side wall of one end of the limiting plate 18 is fixedly connected to the pull block 15, and an arc groove 14 is provided at the end of the pull block 15 near the insertion rod 6; the limiting plate 18 and the hoisting hole 12 are detachably connected. One end of the insertion rod with the insertion hole 16 is passed through the lifting hole 12, and then one end of the limiting plate 18 is passed through the insertion hole 16 so that the inner wall of the arc groove 14 fits against the outer wall of the insertion rod 6. Then, the lifting is carried out by the weight of the structural plate 3 itself, which squeezes the limiting plate 18 to prevent the limiting plate 18 from sliding and falling off, thereby ensuring the stability during the lifting process and preventing the object from falling off during the operation. At the same time, after the lifting is completed and the structural plate 3 is placed, the limiting plate 18 can be pulled out from the insertion hole 16 by the pull block 15 to complete the disassembly of the structural plate 3. Example

[0021] Based on Embodiment 1, in order to make timely adjustments according to the positions of different lifting holes 12, one end of the side wall of the fixed frame 18 is fixedly connected to the motor 17, and the middle side wall of the upper end of the fixed frame 18 is fixedly connected to the adjusting block 2 19; the output end of the motor 17 passes through the side wall of the fixed frame 18 and is fixedly connected to one end of the bidirectional lead screw 13, the other end of the bidirectional lead screw 13 is rotatably connected to the inner wall of the fixed frame 18, and the outer wall of the bidirectional lead screw 13 is threadedly connected to the side wall of the adjusting block 17; one end of the side wall of the fixed frame 2 9 is fixedly connected to the motor 2 11, the output end of the motor 2 11 passes through the side wall of the fixed frame 2 9 and is fixedly connected to one end of the bidirectional lead screw 20, the other end of the bidirectional lead screw 20 is rotatably connected to the inner wall of the fixed frame 2 9, the outer wall of the bidirectional lead screw 20 is threadedly connected to the side wall of the adjusting block 17, and the upper side wall of the fixed frame 2 9 is fixedly connected to the lifting ring 10; The lifting ring 10 can be connected to the lifting equipment. When lifting according to the different positions of the lifting holes 12, the motor 7 can be started first to drive the double-acting screw 13 to rotate. Then, through the threaded connection between the double-acting screw 13 and the adjusting block 17, the positions of the two pairs of insert rods 6 can be moved closer or further apart synchronously, thereby adjusting the position of the lifting holes 12 on both sides. Then, the motor 11 can be started to drive the double-acting screw 20 to rotate. Then, through the threaded connection between the double-acting screw 20 and the adjusting block 19, the position between the two fixed frames 8 can be adjusted, thereby adjusting the position of the other two lifting holes 12. Finally, the position of different lifting holes 12 can be adjusted in a timely manner. Example

[0022] Based on Embodiment 1, a construction method for the non-destructive structural demolition and alteration construction device as described above is also included, comprising the following steps: S1: Determine the demolition area; Before formal construction, the areas that need to be modified should be reasonably analyzed based on the original structural drawings and the modified structural drawings. The areas that need to be modified should be marked on the drawings and on the construction site. Since the original structural construction drawings are old and there are multiple versions of construction drawings in the process, the existing components on site should be checked in a timely manner to avoid discrepancies between the positions of shear walls and columns on site and the drawings. Corrections can be made in a timely manner before construction.

[0023] S2: 3D scanning to generate a model; After the drawings are confirmed to be consistent with the site, a 3D scanner is used to scan the demolition and modification area. By repeatedly changing the position and switching between near and far distances, an accurate on-site real-world image can be obtained, which in turn generates a 3D BIM model that can be viewed on a mobile phone for convenient on-site construction confirmation. In addition, the demolition and modification location information, such as the elevation of walls and columns to be retained and the plane distance of key locations, can be marked on the model based on the drawings.

[0024] S3: Selection of demolition plan; To avoid adverse effects on the surrounding environment and residents from noise and dust generated during the demolition process, and considering the potential damage to the structures to be preserved, the entire demolition project will be carried out using non-destructive static demolition methods. This method mainly utilizes static cutting techniques such as water drills and wire saws, combined with large machinery such as tower cranes and truck cranes for hoisting, to achieve rapid and non-destructive demolition of the structure. Based on the concept of static cutting, the impact on the preserved structure is analyzed, and the structure to be demolished is divided into several sections for simultaneous and symmetrical demolition to avoid affecting the preserved structure. Furthermore, a simulated construction analysis is conducted before construction, and theoretical calculations of structural loads and finite element simulation analysis are performed on the preserved structure after each stage of demolition to determine a reasonable demolition process, which will guide on-site construction and thus reduce the impact on the preserved structure.

[0025] S4: Removal and backfilling plan; Considering that the existing structural beams and slabs need to be supported and backed up during static demolition, and that the subsequent new construction also requires the erection of formwork, the model of the new structure is superimposed and compared with the actual model of the existing structure. During the demolition process, the modular scaffolding is erected according to the module of the new structure. Based on the construction drawings of the original basement roof structure, the beams, exterior walls and columns of the existing structure are positioned and marked. The positions of the beams, exterior walls and columns are marked with spray paint on the upper surface of the basement roof to facilitate the cutting construction and the erection of the truck crane. The uprights of the full-span scaffolding are positioned and marked according to the beams and slabs of the new structure. Before the beam and slab structure is demolished, a socket-type disc-lock scaffold is used as a temporary support. After the beam and slab are demolished and hoisted in sections, the full-span scaffold is adjusted to serve as the formwork for the new beam and slab. The columns are connected and fixed to the full-span scaffold before demolition to prevent the demolished components from overturning. Furthermore, the temporary support frame must undergo stress calculations to ensure sufficient load-bearing capacity. This formwork design can save the cost and time of one scaffold erection and dismantling.

[0026] S5: Static cutting approach; During the demolition process, the demolition should be carried out strictly in accordance with the principle of "top to bottom, non-load-bearing to load-bearing, and symmetrical demolition" along the direction of structural demolition. That is, the upper structure should be demolished first, and the non-load-bearing structure should be demolished before the load-bearing structure. In addition, to ensure the redistribution of structural stress after demolition and to speed up construction, a symmetrical demolition method can be adopted. If there is reinforcement work, demolition work can only be carried out after the reinforcement work in that area is completed. Furthermore, during the demolition process, the structure to be demolished should be reasonably divided into sections based on the lifting distance, lifting weight, and size of the transport vehicles of large machinery and equipment. The shape should be mainly strip-shaped to facilitate lifting and transportation. It is also necessary to consider whether there are any requirements to retain the connection between the old and new structures. After cutting, the anchorage length of the steel bar connection should be retained. In addition, all component cutting for demolition is done using static cutting. The column pre-reinforced sections are removed using static expansion. Static cutting uses wire saws and diamond circular saws, with water drills used for drilling. Before cutting (removing), the cutting dimensions of beams and slabs are calculated based on the weight of the components being hoisted. The basement roof beams, slabs, walls, and columns are cut into sections, with each section weighing ≤8t (depending on the crane's lifting capacity). Forklifts and cranes are used to load and transport the components.

[0027] S6: Static cutting of plates ① Positioning and layout: First, based on the panel's segment size and the position of the support frame uprights, position the panel's cutting seam to be divided into segments. Use a chalk line to mark the lines and determine the segment cutting position to ensure the accuracy of the segment cutting position. ② Drilling holes for hoisting: Use a water drill to drill holes for hoisting to ensure that the demolished concrete can be safely hoisted; ③ Segmented Cutting: The diamond circular saw cuts the structural panel 3 into segments along the cutting seam positioning line and in the cutting sequence; ④ Lifting and transport: After the four sides of the plate are cut off, the lifting assembly is passed through the lifting hole and lifted by a truck crane to the plate truck for transport.

[0028] S7: Beam Static Cutting Construction ① Positioning and layout: First, based on the segmented dimensions of main beam 1 and secondary beam 2, and the positions of the support frame uprights and square timber, position the beams to be segmented and cut. Use a chalk line to mark the lines and determine the segmented cutting positions to ensure the accuracy of the segmented cutting positions. ② Segmented cutting: The wire saw is used to segment the structural beam along the positioning line of the cutting seam and in the cutting sequence; ③ Lifting point setting: Manually chisel out grooves at the 100mm reserved plate on the side of the beam to ensure that the concrete blocks can be safely lifted; ④ After the beam is cut off at both ends, the hoisting components are passed through the bottom of the beam and transported by a truck crane to a flatbed truck for off-site transport.

[0029] S8: Construction of New Structures After the demolition of each section is completed, the temporary support frame is adjusted to a formwork support frame according to the new structure. Then, the processes of formwork erection, rebar tying, concrete pouring, concrete curing, and formwork removal are carried out. During the demolition process, the support frame needs to be monitored. If any location shows significant deformation, it should be marked in time, and that location should be dismantled and re-erected.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-destructive structural demolition and alteration construction device, characterized in that: The non-destructive structural demolition and alteration construction device includes: Fixed frame two (9), with lifting rings (10) on the upper sides of both ends of the fixed frame two (9), and a two-way screw two (20) inside the fixed frame two (9), and a motor two (11) connected to the fixed frame two (9); Fixed frame 1 (8) is provided in pairs. The two fixed frames 1 (8) are located on one side of fixed frame 2 (9). Each fixed frame 1 (8) is connected to motor 1 (7), double-acting screw 1 (13) and adjusting block 2 (19). The double-acting screw 1 (13) is connected to adjusting block 1 (17). The adjusting block 1 (17) is provided with a plug rod (6) and a limiting plate (18) on one side. The limiting plate (18) is connected to a pull block (15). The structural plate (3) is connected to the insert rod (6). The structural plate (3) is connected to the main beam (1) and the secondary beam (2). The main beam (1) is connected to the support column (5). The structural plate (3) has lifting holes (12) around its side walls; The outer wall of one end of the insertion rod (6) is provided with an insertion hole (16), and the other end of the insertion rod (6) passes through the lifting hole (12) and is fixedly connected to the adjusting block (17); One side wall of the limiting plate (18) is fixedly connected to the pull block (15), and the pull block (15) has an arc groove (14) at one end near the insertion rod (6). The limiting plate (18) and the lifting hole (12) are detachably connected. One end of the fixed frame (8) is fixedly connected to the motor (7), and the middle upper end of the fixed frame (8) is fixedly connected to the adjusting block (19). The output end of the motor (7) passes through the side wall of the fixed frame (8) and is fixedly connected to one end of the double-acting screw (13). The other end of the double-acting screw (13) is rotatably connected to the inner wall of the fixed frame (8). The outer wall of the double-acting screw (13) is threadedly connected to the side wall of the adjusting block (17). One end of the fixed frame 2 (9) is fixedly connected to the motor 2 (11). The output end of the motor 2 (11) passes through the side wall of the fixed frame 2 (9) and is fixedly connected to one end of the bidirectional lead screw 2 (20). The other end of the bidirectional lead screw 2 (20) is rotatably connected to the inner wall of the fixed frame 2 (9). The outer wall of the bidirectional lead screw 2 (20) is threadedly connected to the side wall of the adjusting block 1 (17).

2. The non-destructive structural demolition and alteration construction device according to claim 1, characterized in that: The support column (5) is fixedly connected to the main beam (1), the main beam (1) is fixedly connected to the secondary beam (2), and a dividing line (4) is provided between the secondary beam (2) and the structural plate (3).

3. A construction method for a non-destructive structural demolition and alteration construction device as described in any one of claims 1-2, characterized in that: Includes the following steps: S1: To determine the demolition area, the area to be modified should be reasonably analyzed based on the original structural drawings and the modified structural drawings, and the area to be modified should be marked on the drawings and at the construction site. S2: 3D scanning and model generation. After the drawings and the site are confirmed to be consistent, a 3D scanner is used to scan the demolition and modification area. By changing the position and switching between near and far distances for scanning multiple times, an accurate on-site real-world image can be obtained, which in turn generates a 3D BIM model drawing that can be viewed on a mobile phone for convenient on-site construction confirmation. S3: Regarding the selection of the demolition plan, in order to avoid the noise and dust generated during the demolition process from causing adverse effects on the surrounding environment and residents, and considering the potential damage to the structures to be preserved during the demolition process, the entire demolition project will be carried out using non-destructive static demolition methods. S4: Demolition and back-top scheme. Considering that the existing structural beams and slabs need to be supported and back-topped during static demolition, and that the subsequent new construction also needs to erect a formwork frame, the new structural model is compared with the existing structural real scene model by superimposing them. S5: The static cutting approach should be followed along the direction of structural demolition during the demolition process; S6: Static cutting of plates ① Positioning and layout: First, based on the panel's segment size and the position of the support frame uprights, position the panel's cutting seam to be divided into segments. Use a chalk line to mark the lines and determine the segment cutting position to ensure the accuracy of the segment cutting position. ② Drilling holes for hoisting: Use a water drill to drill holes for hoisting to ensure that the demolished concrete can be safely hoisted; ③ Segmented Cutting: The diamond circular saw cuts the structural panel into segments along the positioning line of the cutting seam and in the cutting sequence. ④ Lifting and transport: After the four sides of the plate are cut off, the lifting assembly is passed through the lifting hole and lifted by a truck crane to the flatbed truck for transport. S7: Beam Static Cutting Construction ① Positioning and layout: First, based on the segmented dimensions of the beam and the positions of the support frame uprights and square timber, position the beam to be segmented and cut. Use a chalk line to mark the lines to determine the segmented cutting positions and ensure the accuracy of the segmented cutting positions. ② Segmented cutting: The wire saw is used to segment the structural beam along the positioning line of the cutting seam and in the cutting sequence; ③ Lifting point setting: Manually chisel out grooves at the 100mm reserved plate on the side of the beam to ensure that the concrete blocks can be safely lifted; ④ After the beam is cut off at both ends, the hoisting components are passed through the bottom of the beam and lifted by a truck crane to a flatbed truck for transport. S8: Construction of new structures.

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