In-building dismantling method for multi-layer concrete frame

Abstract

The invention relates to the technical field of constructional engineering, and discloses an in-building dismantling method for a multi-layer concrete frame, which is applied to dismantling the multi-layer concrete frame with an atrium, and the multi-layer concrete frame comprises a bottom layer structure and a plurality of layers of high-rise structures sequentially arranged on the bottom layer structure, the multi-layer high-rise structure is sequentially numbered as 1, 2... N-1 and N. The in-building dismantling method comprises the following steps that a channel communicated with an atrium is formed in a multi-layer concrete frame, and a lengthened arm hydraulic shear in a folded state penetrates through the channel to enter the atrium; switching the extension jib hydraulic shear from a folded state to an unfolded state, enabling a shearing part of the extension jib hydraulic shear to correspond to the high-rise structure with the number N, moving the extension jib hydraulic shear in the atrium to dismantle the high-rise structure with the number N, and repeating the step until the high-rise structure with the number 1 is dismantled; a rope saw is used for cutting the bottom layer structure for dismantling; the low-noise and low-pollution dismantling effect can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a method for dismantling a multi-story concrete frame in a building. Background Art

[0002] As the urban population increases, urban land resources become increasingly scarce, so more and more old houses need to be renovated. Some buildings that do not conform to the new urban planning need to be demolished, and among these buildings, houses with less than ten floors and more than three floors (such as buildings and hotels) account for a very high proportion.

[0003] After protective demolition of furniture, doors, lamps, bathroom facilities, artworks, decoration materials, glass railings, etc., the remaining main body of the house is mostly a concrete frame structure. At present, most of the demolition of the concrete frame structure of the house adopts outdoor demolition method, using engineering machinery to apply pressure or shear force to the concrete frame outside the building to achieve the purpose of demolition. However, the fragmented walls removed by this demolition method are easy to fall and hit the surrounding buildings, and a large amount of dust is generated outside the building. That is, the above demolition method has the defects of high requirements on the conditions of the construction site and a large impact on the surrounding environment. Summary of the invention

[0004] In view of this, the present invention provides a method for demolishing a multi-story concrete frame in a building to solve the problem that the existing demolition method has high requirements on the conditions of the construction site and has a great impact on the surrounding environment.

[0005] The present invention provides a method for dismantling a multi-story concrete frame in a building, which is applied to dismantling a multi-story concrete frame with an atrium, wherein the multi-story concrete frame comprises a bottom structure and multiple layers of high-rise structures sequentially arranged on the bottom structure, wherein the multiple layers of high-rise structures are numbered 1, 2...N-1, N from bottom to top, and the method comprises the following steps:

[0006] A passage communicating with the atrium is opened at the lower end of the multi-story concrete frame, and a hydraulic shear with an extended arm in a folded state is passed through the passage and enters the atrium;

[0007] Switch the extended arm hydraulic shears from a folded state to an unfolded state so that the shearing portion of the extended arm hydraulic shears corresponds to the high-rise structure numbered N, and move the extended arm hydraulic shears in the atrium to demolish the high-rise structure numbered N;

[0008] After the demolition of the high-rise structure numbered N is completed, the shearing portion of the extended arm hydraulic shear is lowered to a position corresponding to the high-rise structure numbered N-1, and the extended arm hydraulic shear is moved in the atrium to demolish the high-rise structure numbered N-1; this step is repeated until the high-rise structure numbered 1 is demolished;

[0009] The substructure is removed by cutting it using a wire saw.

[0010] The method for dismantling a multi-story concrete frame in a building according to the present invention has at least the following beneficial effects:

[0011] By first opening a passage connected to the atrium at the lower end of the multi-story concrete frame, the folded extended-arm hydraulic shears can pass through the passage into the atrium. The atrium provides space for the extended-arm hydraulic shears to unfold and move, so that the extended-arm hydraulic shears can be flexibly moved, transferred and lifted in the atrium, so that the high-rise structure can be dismantled from top to bottom while the extended-arm hydraulic shears are kept inside the multi-story concrete frame, thereby dismantling most of the multi-story concrete frame inside the building, reducing the amount of dust and noise spread to the outside environment, and the dismantled fragmented walls basically fall into the building, achieving low noise, low pollution and low requirements for construction site conditions. The system is particularly suitable for the demolition of houses located in urban areas with narrow roads, dense traffic and complex surrounding environments.

[0012] In an optional embodiment, before the extended arm hydraulic shears pass through the passage and enter the atrium, the following steps are also included:

[0013] The inner bottom surface of the atrium for the extended arm hydraulic shears to walk on is subjected to a top-return treatment.

[0014] In an optional embodiment, two extended arm hydraulic shears are provided, and the two extended arm hydraulic shears are used to simultaneously demolish two symmetrical sides of the high-rise structure.

[0015] In an optional implementation manner, the high-rise structure is provided with five floors, and before demolishing the high-rise structure numbered 5, the following steps are also included:

[0016] Extended arm hydraulic shears were used to partially demolish the beams and slabs of the high-rise structures numbered 2, 3, 4 and 5 relatively close to the atrium in the horizontal direction.

[0017] In an optional implementation manner, before demolishing the high-rise structure numbered 5, the following steps are also included:

[0018] The extended arm hydraulic shears are used to further remove the beams and slabs of the high-rise structure No. 4 relatively close to the atrium in the horizontal direction.

[0019] In an optional implementation manner, before demolishing the high-rise structure numbered 4, the following steps are also included:

[0020] The extended arm hydraulic shears are used to further remove the beams and slabs of the high-rise structure No. 3 relatively close to the atrium in the horizontal direction.

[0021] In an optional implementation manner, before demolishing the high-rise structure numbered 3, the following steps are also included:

[0022] The extended arm hydraulic shears are used to further remove the beams and slabs of the high-rise structure No. 2 relatively close to the atrium in the horizontal direction.

[0023] In an optional implementation manner, before demolishing the high-rise structure numbered 2, the following steps are also included:

[0024] The cantilevered corridor of the high-rise structure numbered 1 which is relatively close to the atrium in the horizontal direction is demolished using an extended arm hydraulic shear.

[0025] In an optional embodiment, the multi-story concrete frame further includes a basement structure, and the basement structure is arranged at one end of the base structure relatively far away from the high-rise structure; after the base structure is demolished, the following structure is further included:

[0026] The basement structure is demolished by cutting the top beam slab relatively close to the basement structure using a wire saw.

[0027] In an optional embodiment, before using a wire saw to cut the underlying structure for demolition, the following steps are also included:

[0028] Use extended arm hydraulic shears to remove the beams and slabs of the lower structure that is relatively close to the high-rise structure numbered 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic diagram of dismantling the high-rise structure numbered 5 of the concrete frame of the Opposite House Hotel in the dismantling method of this embodiment;

[0031] Figure 2 This is a schematic diagram of dismantling a high-rise structure numbered 4 of the concrete frame of the Opposite House Hotel in the dismantling method of this embodiment;

[0032] Figure 3 This is a schematic diagram of dismantling the high-rise structure numbered 3 of the concrete frame of the Opposite House Hotel in the dismantling method of this embodiment;

[0033] Figure 4It is a schematic diagram of dismantling the high-rise structure numbered 2 of the concrete frame of the Opposite House Hotel in the dismantling method of this embodiment;

[0034] Figure 5 Schematic diagram of dismantling the high-rise structure No. 1 of the concrete frame of the Opposite House Hotel in the dismantling method of this embodiment

[0035] Figure 6 A schematic diagram of dismantling the bottom structure of the concrete frame of the Opposite House Hotel in the dismantling method of this embodiment;

[0036] Figure 7 A schematic diagram of dismantling the concrete frame basement structure of The Opposite House Hotel in the dismantling method of this embodiment.

[0037] Description of reference numerals:

[0038] 100-atrium, 200-channel, 300-extended arm hydraulic shears. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] In the description of this embodiment, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this embodiment. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of this embodiment, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0042] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0043] According to an embodiment of the present invention, a method for demolishing a multi-story concrete frame in a building is specifically applied to demolishing a concrete frame of the Opposite House Hotel located in the North District of Sanlitun Taikoo Li, Chaoyang District, Beijing. The concrete frame of the Opposite House Hotel is the main frame remaining after protective demolition of the furniture, doors, lamps, bathroom facilities, artworks, decoration materials, glass railings, etc. of the Opposite House Hotel, and non-protective demolition of the skylight. The concrete frame of the Opposite House Hotel includes six floors above ground (i.e., one bottom structure and five high-rise structures, and the five high-rise structures are numbered 1, 2, 3, 4 and 5 from bottom to top) and a basement structure. An atrium 100 is arranged in the concrete frame of the Opposite House Hotel. The method for demolishing the concrete frame of the Opposite House Hotel in the building specifically includes the following steps:

[0044] A passage 200 communicating with the atrium 100 is opened in the bottom structure of the concrete frame of the Opposite House Hotel, and a folded extended arm hydraulic shear 300 is passed through the passage 200 and enters the atrium 100;

[0045] Switch the extended arm hydraulic shear 300 from the folded state to the unfolded state so that the shearing portion of the extended arm hydraulic shear 300 corresponds to the high-rise structure numbered 5, and move the extended arm hydraulic shear 300 in the atrium 100 to demolish the high-rise structure numbered 5;

[0046] After the demolition of the high-rise structure numbered 5 is completed, the shearing portion of the extended arm hydraulic shear 300 is lowered to a position corresponding to the high-rise structure numbered 4, and the extended arm hydraulic shear 300 is moved in the atrium 100 to demolish the high-rise structure numbered 4;

[0047] After the demolition of the high-rise structure numbered 4 is completed, the shearing portion of the extended arm hydraulic shear 300 is lowered to a position corresponding to the high-rise structure numbered 3, and the extended arm hydraulic shear 300 is moved in the atrium 100 to demolish the high-rise structure numbered 3;

[0048] After the demolition of the high-rise structure No. 3 is completed, the shearing portion of the extended arm hydraulic shear 300 is lowered to a position corresponding to the high-rise structure No. 2, and the extended arm hydraulic shear 300 is moved in the atrium 100 to demolish the high-rise structure No. 2;

[0049] After the demolition of the high-rise structure numbered 2 is completed, the shearing portion of the extended arm hydraulic shear 300 is lowered to a position corresponding to the high-rise structure numbered 1, and the extended arm hydraulic shear 300 is moved in the atrium 100 to demolish the high-rise structure numbered 1;

[0050] The substructure is demolished by cutting it with a rope saw. Specifically, the top of the column of the substructure and the beam slab at the lane position are cut with a rope saw, and the length of the steel bars at the top of the column of the substructure is retained to be not less than 1 meter for the steel bar connection of the new construction project.

[0051] The demolition method in the building of the present embodiment is to first open a passage 200 connected to the atrium 100 in the bottom structure of the concrete frame of the Opposite House Hotel, so that the folded extended arm hydraulic shears 300 can pass through the passage 200 into the atrium 100. The atrium 100 provides a space for the extended arm hydraulic shears 300 to unfold and move, so that the extended arm hydraulic shears 300 can be flexibly moved, transferred and lifted in the atrium 100, so that the five-story high-rise structure is demolished from top to bottom in sequence while the extended arm hydraulic shears 300 is kept inside the concrete frame of the Opposite House Hotel, thereby realizing the demolition of most of the concrete frame of the Opposite House Hotel in the building, reducing the amount of dust diffused into the environment outside the building and reducing the noise generated to diffuse into the environment outside the building, and the demolished fragmented walls basically fall into the building, achieving the effects of low noise, low pollution and low requirements on the conditions of the construction site, and is particularly suitable for the demolition of the concrete frame of the Opposite House Hotel located in a city with narrow roads, dense traffic and complex surrounding environment.

[0052] It should be noted that The Opposite House is located in Sanlitun, Chaoyang District, Beijing, where the roads are narrow, the flow of people is dense, the surrounding environment is complex, and it is close to important buildings such as commercial, residential, schools, hospitals, and embassies. In addition, there is no demolition operating surface on the outside of the concrete frame of The Opposite House, so static demolition can only be used. During the demolition of the concrete frame by the traditional outside-building demolition method, fragmented walls are likely to fall and hit important surrounding buildings, and the generated dust and noise are likely to spread to the surrounding environment outside the hotel. It can be seen that the traditional outside-building demolition method is not suitable for the demolition of the concrete frame of The Opposite House.

[0053] In a specific application, since the Opposite House Hotel only has a 15-meter-wide space available on its east side, a passage 200 connected to the atrium 100 is opened on the east side of the bottom structure of the Opposite House Hotel to facilitate the use of an extended-arm hydraulic shear 300 from the 15-meter-wide space into the atrium 100 through the passage 200, and to facilitate vehicles to enter and exit the atrium 100 to transport the dismantled components from the east side.

[0054] It should be noted that demolition of high-rise structures actually means demolition of beams, slabs and columns.

[0055] It is understandable that the demolition height of the extended-arm hydraulic shear 300 can reach 30m, with an opening diameter of 850mm, and it can be used to demolish beams, slabs and columns; the outside of the concrete frame of the Yushe Hotel does not have the operating conditions for the extended-arm hydraulic shear 300, but the original hotel has an atrium 100 with an area of ​​approximately 400 square meters, which can be used as the operating surface of the extended-arm hydraulic shear 300.

[0056] It can be understood that this embodiment only uses the concrete frame of the Opposite House Hotel as an example of a multi-story concrete frame, and does not limit the specific type of the multi-story concrete frame. In other embodiments, the multi-story concrete frame may also be a four-story hotel, a five-story hotel, a seven-story hotel, etc. with an atrium 100 located in a city with narrow roads, dense traffic, and complex surrounding environment.

[0057] Specifically, during the demolition of a high-rise building in the building, a sprinkler truck can be used to carry out dust reduction and watering operations on the demolition operation area of ​​the extended arm hydraulic shears 300, which can better control the pollution to the environment.

[0058] In some embodiments, before the extended arm hydraulic shears 300 pass through the passage 200 and enter the atrium 100, the following steps are further included:

[0059] The inner bottom surface of the atrium 100 for the extended arm hydraulic shears 300 to walk on is subjected to a top-returning treatment.

[0060] In this embodiment, the inner bottom surface of the atrium 100 is pre-recovered to improve the support stability of the inner bottom surface of the atrium 100, thereby facilitating the extended arm hydraulic shears 300 to move back and forth smoothly on the inner bottom surface of the atrium 100, thereby improving the quality of demolition.

[0061] In some embodiments, two extended arm hydraulic shears 300 are provided, and the two extended arm hydraulic shears 300 are used to simultaneously demolish two symmetrical sides of the high-rise structure, thereby achieving symmetrical demolition, high construction safety and fast demolition speed.

[0062] In some embodiments, before demolishing the high-rise structure numbered 5, the following steps are also included:

[0063] The extended arm hydraulic shears 300 are used to partially demolish the beams and slabs of the high-rise structures numbered 2, 3, 4 and 5 relatively close to the atrium 100 in the horizontal direction.

[0064] In this embodiment, by first partially demolishing the beams and slabs of the high-rise structure located on the top four floors relatively close to the atrium 100, the operating range of the extended-arm hydraulic shears 300 at a higher position is expanded on the basis of ensuring that the concrete frame of the Opposite House Hotel will not collapse, thereby facilitating the demolition effect and the convenience of the demolition operation.

[0065] Specifically, before demolishing the high-rise structure No. 5, the following steps are also included:

[0066] The extended arm hydraulic shears 300 are used to further remove the beams and slabs of the high-rise structure numbered 4 relatively close to the atrium 100 in the horizontal direction.

[0067] Because the floor slab of the high-rise structure numbered 4 mainly bears the weight of the high-rise structure numbered 5, the present embodiment further demolishes the floor slab of the high-rise structure numbered 4 that has been partially demolished without causing the overall collapse of the high-rise structure numbered 5, and can further expand the working space for the extended arm hydraulic shears 300 to demolish the high-rise structure numbered 5, thereby further improving the convenience of demolishing the high-rise structure numbered 5.

[0068] Specifically, before demolishing the high-rise structure No. 4, the following steps are also included:

[0069] The extended arm hydraulic shears 300 are used to further remove the beams and slabs of the high-rise structure numbered 3 relatively close to the atrium 100 in the horizontal direction.

[0070] Because after the high-rise structure No. 5 is demolished, the floor slab of the high-rise structure No. 3 mainly bears the weight of the high-rise structure No. 4, so the present embodiment further demolishes the floor slab of the high-rise structure No. 3 that has been partially demolished, and will not cause the overall collapse of the high-rise structure No. 4, and can further expand the working space of the extended arm hydraulic shears 300 for demolishing the high-rise structure No. 4, thereby further improving the convenience of demolishing the high-rise structure No. 4.

[0071] Specifically, before demolishing the high-rise structure No. 3, the following steps are also included:

[0072] The extended arm hydraulic shears 300 are used to further remove the beams and slabs of the high-rise structure numbered 2 relatively close to the atrium 100 in the horizontal direction.

[0073] Because after the high-rise structures numbered 4 and 5 are demolished, the floor slab of the high-rise structure numbered 2 mainly bears the weight of the high-rise structure numbered 3. Therefore, in this embodiment, the floor slab of the high-rise structure numbered 2 that has been partially demolished is further demolished without causing the overall collapse of the high-rise structure numbered 3. In addition, the working space for the extended arm hydraulic shears 300 to demolish the high-rise structure numbered 3 can be further expanded, thereby further improving the convenience of demolishing the high-rise structure numbered 3.

[0074] Specifically, before demolishing the high-rise structure No. 2, the following steps are also included:

[0075] The extended arm hydraulic shears 300 are used to demolish the cantilever corridor of the high-rise structure numbered 1 relatively close to the atrium 100 in the horizontal direction.

[0076] In this embodiment, the cantilevered corridor of the high-rise structure numbered 1 is first demolished to release more space, thereby further improving the convenience of demolishing the high-rise structure numbered 2.

[0077] In some embodiments, after the underlying structure is removed, the following structure is also included:

[0078] The basement structure is demolished by cutting the top beam slab relatively close to the basement structure using a rope saw; the shear wall position will be subsequently demolished after the new building structure reaches the design requirements, so as to ensure the overall rigidity of the new building structure.

[0079] In some embodiments, before using a wire saw to cut the underlying structure for demolition, the method further includes the following steps:

[0080] The extended arm hydraulic shears 300 are used to remove the beams and slabs of the lower structure which is relatively close to the high-rise structure numbered 1.

[0081] In this embodiment, the beams and slabs of the underlying structure are dismantled by means of an extended arm hydraulic shear 300, and the other parts of the underlying structure are dismantled in coordination with the use of a rope saw cutting method, thereby shortening the construction period while retaining the length of the top steel bars of the columns of the underlying structure for connecting the steel bars of the new construction project to be not less than 1 meter.

[0082] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended invention.

Claims

1. A method for dismantling a multi-storey concrete frame in a building, applied to dismantling a multi-storey concrete frame with an atrium (100), wherein the multi-storey concrete frame comprises a bottom structure and multiple layers of high-rise structures sequentially arranged on the bottom structure, wherein the multiple layers of high-rise structures are numbered 1, 2 ... N-1, N from bottom to top, and characterized in that: The in-building demolition method comprises the following steps: A passage (200) communicating with the atrium (100) is opened at the lower end of the multi-story concrete frame, and a hydraulic shear (300) with an extended arm in a folded state is passed through the passage (200) and enters the atrium (100); Switching the extended arm hydraulic shear (300) from a folded state to an unfolded state so that the shearing portion of the extended arm hydraulic shear (300) corresponds to the high-rise structure numbered N, and moving the extended arm hydraulic shear (300) in the atrium (100) to dismantle the high-rise structure numbered N; After the demolition of the high-rise structure numbered N is completed, the shearing portion of the extended arm hydraulic shear (300) is lowered to a position corresponding to the high-rise structure numbered N-1, and the extended arm hydraulic shear (300) is moved in the atrium (100) to demolish the high-rise structure numbered N-1; this step is repeated until the high-rise structure numbered 1 is demolished; The substructure is removed by cutting it using a wire saw.

2. A method for dismantling a multi-story concrete frame in a building according to claim 1, characterized in that: Before the extended arm hydraulic shears (300) pass through the passage (200) and enter the atrium (100), the following steps are also included: The inner bottom surface of the atrium (100) for the extended arm hydraulic shears (300) to walk on is subjected to a top-returning treatment.

3. The method for dismantling a multi-story concrete frame in a building according to claim 1, characterized in that: Two extended arm hydraulic shears (300) are provided, and the two extended arm hydraulic shears (300) are used to simultaneously demolish two symmetrical sides of the high-rise structure.

4. A method for dismantling a multi-story concrete frame in a building according to any one of claims 1 to 3, characterized in that: The high-rise structure has five floors. Before demolishing the high-rise structure numbered 5, the following steps are also included: The extended arm hydraulic shears (300) are used to partially demolish the beams and slabs of the high-rise structures numbered 2, 3, 4 and 5 which are relatively close to the atrium (100) in the horizontal direction.

5. The method for dismantling a multi-story concrete frame in a building according to claim 4, characterized in that: Before demolishing the high-rise structure No. 5, the following steps are also included: The extended arm hydraulic shears (300) are used to further remove the beams and slabs of the high-rise structure numbered 4 relatively close to the atrium (100) in the horizontal direction.

6. A method for dismantling a multi-story concrete frame in a building according to claim 5, characterized in that: Before demolishing the high-rise structure No. 4, the following steps are also included: The extended arm hydraulic shears (300) are used to further remove the beams and slabs of the high-rise structure numbered 3 that are relatively close to the atrium (100) in the horizontal direction.

7. A method for dismantling a multi-story concrete frame in a building according to claim 6, characterized in that: Before demolishing the high-rise structure No. 3, the following steps are also included: The extended arm hydraulic shears (300) are used to further remove the beams and slabs of the high-rise structure numbered 2 relatively close to the atrium (100) in the horizontal direction.

8. A method for dismantling a multi-story concrete frame in a building according to claim 6 or 7, characterized in that: Before demolishing the high-rise structure No. 2, the following steps are also included: The cantilevered corridor of the high-rise structure numbered 1 which is relatively close to the atrium (100) in the horizontal direction is demolished using an extended arm hydraulic shear (300).

9. The method for dismantling a multi-story concrete frame in a building according to claim 1, characterized in that: The multi-story concrete frame further includes a basement structure, which is arranged at one end of the base structure relatively far from the high-rise structure; after the base structure is removed, the following structures are also included: The basement structure is demolished by cutting the top beam slab relatively close to the basement structure using a wire saw.

10. The method for dismantling a multi-story concrete frame in a building according to claim 1, characterized in that: Before using a wire saw to cut the underlying structure for demolition, the following steps are also included: The extended arm hydraulic shears (300) are used to remove the beams and slabs of the lower structure relatively close to the high-rise structure numbered 1.

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