Multi-story reinforced concrete load-bearing wall self-supporting structure and construction method thereof

Abstract

The present application relates to a kind of multi-storey reinforced concrete load-bearing wall self-supporting structure and its construction method, which is set in the load-bearing wall to be removed horizontal beam type component, vertical column type component or the combination of both, horizontal beam type component is located at the floor bottom elevation of each floor, vertical column type component is located at each floor;Horizontal beam type component and / or vertical column type component are clamped between two load-bearing wall to be removed boundary division line, after the load-bearing wall to be removed between two load-bearing wall to be removed boundary division line is removed, the horizontal beam type component and / or vertical column type component retained form the self-supporting structure of alternative scaffold support system.The present application reasonably utilizes the partial wall segment temporarily retained by the structure to be removed as temporary support, compared with scaffold support system, it is more stable;During construction, the erection of scaffold support system can be reduced or even completely exempted, thereby significantly reducing the occupancy rate of construction space, safety and construction efficiency can be improved, and cost can be saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of protective demolition construction of existing engineering structures, and particularly relates to a multi-high-rise reinforced concrete load-bearing wall self-supporting structure and a protective demolition construction method thereof. BACKGROUND

[0002] There are a large number of reinforced concrete structures in existing civil and industrial buildings and structures in China. At present, with the deepening of urban renewal, many existing buildings and structures are faced with the problems of functional change, structural system change or the need to meet the requirements of new design specifications, etc. Therefore, the partial load-bearing walls in multi-high-rise reinforced concrete structures often need to be underpinned and removed or relocated and newly built. Since the number of layers of the load-bearing walls to be removed and changed is large, according to the traditional demolition construction method, a stable temporary scaffold support system needs to be first set to unload the upper structure supported by the structure to be removed, so as to ensure the safety of the structure during the demolition construction, and then the structure is removed layer by layer in the order from top to bottom. After the demolition construction is completed, the construction of the underpinned and reinforced structure or the newly built vertical member is carried out. In the above construction process, the support unloading is first carried out, then the demolition construction is carried out, and finally the structure reinforcement or new construction is carried out. The construction processes can only be sequentially constructed and cannot be simultaneously constructed. This will result in a long total construction period. When the number of floors to be removed is large, it often becomes the key line of construction organization design.

[0003] In addition, in the case where the construction space is limited, the temporary support system may occupy a large space, increasing the difficulty of the demolition, reinforcement and new construction operations. For example, new members need to be newly built near the removed load-bearing walls, and the new members also need to be set with formworks and scaffold support systems. This will cause the demolition support system and the new member formwork support system to be overlapped and inserted with each other, further increasing the construction difficulty and possibly causing further increase of the construction period and construction cost.

[0004] With more and more urban renewal projects being implemented, the work involving the demolition and reconstruction of multi-high-rise reinforced concrete load-bearing walls is also increasing. The main problem we are facing is to propose a stable, safe, efficient and economical way to demolish multi-high-rise reinforced concrete load-bearing walls, which can replace the traditional demolition technology and be applied to the reinforcement and reconstruction construction of existing buildings and structures in urban renewal projects. This is an urgent problem to be solved at present. SUMMARY

[0005] The application designs a multi-high reinforced concrete load-bearing wall self-supporting structure and a construction method thereof, and solves the technical problem that the traditional multi-high reinforced concrete load-bearing wall demolition technology needs to set up a large amount of temporary scaffold support system, support back, then carry out demolition construction, finally carry out structure reinforcement or new construction, and each construction process can only be sequentially constructed, the cost is high, the construction period is long, and the large construction space is occupied after the temporary scaffold support system is set up, thereby increasing the difficulty of the demolition, reinforcement and new construction operation.

[0006] In order to solve the above technical problems, the application adopts the following scheme:

[0007] A multi-high reinforced concrete load-bearing wall self-supporting structure, characterized in that: horizontal beam members, vertical column members or a combination of the two are arranged in the load-bearing wall to be demolished, the horizontal beam members are arranged at the floor bottom elevation of each floor, and the vertical column members are arranged at each floor to reduce the span of the beam members; the horizontal beam members and the vertical column members are perpendicular to each other; the horizontal beam members and / or the vertical column members are clamped between two boundary division lines of the load-bearing wall to be demolished, and after the load-bearing wall to be demolished between the two boundary division lines is demolished, the horizontal beam members and / or the vertical column members remaining form a self-supporting structure replacing the scaffold support system.

[0008] Preferably, the cross-sectional size of the horizontal beam members, the vertical column members or their combination is determined based on the permanent remaining structure zero damage principle; the permanent remaining structure zero damage principle is that the self-supporting structure formed by the horizontal beam members, the vertical column members or their combination, after establishing a finite element calculation model with the overall structure and analyzing and calculating, the stress value of the original structure which is continuously retained and used should be less than the tensile strength design value.

[0009] Preferably, the cross-sectional size of the horizontal beam members, the vertical column members or their specific combination is determined based on the temporary remaining local structure minimum safety reserve principle; the temporary remaining local structure minimum safety reserve principle is that the self-supporting structure formed by the horizontal beam members, the vertical column members or their combination, after establishing a finite element calculation model with the overall structure and analyzing and calculating, the self-supporting structure can be cracked, but needs to meet the bearing capacity limit state.

[0010] Preferably, when calculating and determining the cross-sectional dimensions of the horizontal beam members, vertical column members or their combinations, the principle of minimum interference to subsequent construction of temporarily retaining local structures should be based; the temporarily retaining local structures meeting the principle of minimum interference to subsequent construction refer to self-supporting structures formed by horizontal beam members, vertical column members or their combinations, part or all of which can be used as components of subsequent reinforcement structures, or do not affect the construction of subsequent reinforcement structures or new structures, and at the same time, the workload of its own demolition should be less than the workload of scaffolding support erection and demolition.

[0011] Preferably, when there is only a horizontal beam member, the horizontal beam member is clamped between the boundary dividing lines of two to-be-demolished load-bearing walls to form a "mouth" shape.

[0012] Preferably, when there is a combination of horizontal beam members and vertical column members, the horizontal beam members and vertical column members form a "T" shape.

[0013] Preferably, when there is a combination of horizontal beam members and vertical column members, the horizontal beam members and vertical column members form a "π" shape.

[0014] A construction method for a self-supporting structure of multi-story and high-rise reinforced concrete load-bearing walls includes the following steps:

[0015] Step 1, determine the cross-sectional dimensions and positions of the horizontal beam members or / and vertical column members of each floor's load-bearing walls;

[0016] Step 2, determine the boundary dividing lines of the to-be-demolished load-bearing walls based on the positions of the horizontal beam members or / and vertical column members on the load-bearing walls; the horizontal beam members or / and vertical column members are limited between the two boundary dividing lines of the to-be-demolished load-bearing walls;

[0017] Step 3, remove the items or loads on the load-bearing walls and ensure the safety of the construction area of the to-be-demolished load-bearing walls;

[0018] Step 4, according to the positioning of the horizontal beam member boundary line, install the guide rail for the wall saw, and fix the guide rail with anchor bolts; the wall saw moves along the horizontal beam member boundary line and cuts according to the principle of moving from left to right or from right to left in the horizontal direction to cut off the connection between the horizontal beam member and the to-be-demolished load-bearing wall;

[0019] Or / and, according to the positioning of the vertical column boundary line, install the guide rail for the wall saw and fix it with anchor bolts; the wall saw moves along the vertical column boundary line and cuts according to the principle of moving from top to bottom in the vertical direction to cut off the connection between the vertical column member and the to-be-demolished load-bearing wall;

[0020] Step 5, the wall between the two boundary division lines of the to-be-removed load-bearing wall is broken and removed, and the horizontal beam member and / or the vertical column member are reserved.

[0021] Step 6, after the to-be-removed load-bearing wall is removed to a distance of 200 mm from the lower floor, the hydraulic shear breaking is stopped.

[0022] Step 7, the to-be-removed load-bearing wall is removed repeatedly according to the steps 1-6 on each floor, and the removal is performed from one side to the other side until the self-supporting structure composed of the horizontal beam member, the vertical column member or the combination thereof is formed.

[0023] Step 8, the new structure or the reinforcing member is added on each floor, and after the new structure or the reinforcing member forms a stable permanent structure, the self-supporting structure composed of the horizontal beam member, the vertical column member or the combination thereof is removed.

[0024] Step 9, the section formed after the self-supporting structure is removed is smoothed by using the high-strength polymer mortar, and the maintenance treatment is performed.

[0025] Preferably, water is used for cooling and removing the dust during the wall saw cutting in step 4, the cutting depth is controlled by controlling the wall saw operation disc, but the cutting depth should not be more than 200 mm each time, and the shallow cutting and fast running mode is used to gradually deepen the cutting back and forth, so as to avoid cutting too deep, the diamond saw blade of the wall saw is deformed under stress, and even mechanical injury accidents may occur.

[0026] Preferably, the hydraulic shear is used to break from the proximal end to the distal end along the horizontal direction in step 5, and then the breaking is performed from the distal end to the proximal end after the breaking reaches the boundary division line position of the to-be-removed load-bearing wall, and the breaking route is S-shaped.

[0027] Preferably, the remaining 200 mm high to-be-removed load-bearing wall is chiseled by using the electric grab in step 6, so as to prevent the hydraulic shear from being damaged to the lower floor.

[0028] The multi-story reinforced concrete load-bearing wall self-supporting structure and the construction method thereof have the following beneficial effects:

[0029] (1) According to the stress characteristics in the process of removing the multi-story reinforced concrete load-bearing wall, the local to-be-removed structure is temporarily reserved as a self-supporting structure, so as to avoid setting up a scaffold for temporary support, and the removal and the new construction are simultaneously performed. The removal construction is performed from top to bottom, and the new construction is performed from bottom to top, and they do not interfere with each other, so that the time and space of multi-work construction are planned, the construction period is greatly shortened, and the construction difficulty is also reduced.

[0030] (2) The application rationally utilizes the temporarily reserved local structure as a self-supporting structure, is more stable compared with a scaffold temporary support system, and significantly improves the safety of a multi-high-rise reinforced concrete load-bearing wall structure during a demolition process.

[0031] (3) The application can reduce or even completely avoid the erection of a scaffold temporary support system during construction, thereby greatly reducing the construction space occupancy rate, reducing the influence on the subsequent construction operation space, avoiding cross operation in the same space, and obviously improving the safety and construction efficiency.

[0032] (4) The application uses a temporarily reserved structure as a self-supporting structure, and the structure to be demolished itself forms a balanced and stable structure system. Meanwhile, by using the spatial distribution characteristics of multi-high-rise structure operation by floor, demolition construction, structure reinforcement construction, and new structure construction can be carried out simultaneously in different operation spaces, effectively realizing the space-time coordination of various types of construction, greatly shortening the construction period and reducing the cost. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 : The application is a multi-high-rise reinforced concrete load-bearing wall self-supporting structure facade schematic diagram;

[0034] Figure 2 : Figure 1 cutting horizontal beam type component schematic diagram;

[0035] Figure 3 : Figure 1 cutting vertical column type component schematic diagram;

[0036] Figure 4 : Figure 1 demolition wall segment construction schematic diagram.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 1 - to-be-demolished load-bearing wall boundary division line; 2 - to-be-demolished load-bearing wall; 3 - horizontal beam type component; 4 - vertical column type component; 5 - floor; 6 - horizontal beam type component boundary line; 7 - special guide rail; 8 - anchor bolt; 9 - vertical column type component boundary line; 10 - wall saw; 11 - hydraulic shear; 12 - electric grab. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with Figures 1 to 4 :

[0040] Example 1:

[0041] As Figure 1As shown, a multi-high reinforced concrete load-bearing wall self-supporting structure is provided with horizontal beam members 3 and vertical column members 4 or a combination of both in the load-bearing wall 2 to be demolished, the horizontal beam members 3 are located at the bottom elevation of the floor slab 5 of each floor, and the vertical column members 4 are located at each floor to reduce the span of the beam members; the horizontal beam members 3 and the vertical column members 4 are perpendicular to each other; the horizontal beam members 3 and / or the vertical column members 4 are clamped between two boundary division lines 1 of the load-bearing wall to be demolished, and after the load-bearing wall 2 between the two boundary division lines 1 of the load-bearing wall to be demolished is demolished, the horizontal beam members 3 and / or the vertical column members 4 remaining form a self-supporting structure that replaces the scaffold support system.

[0042] The horizontal beam members are arranged at the bottom elevation of the floor slab, and the total length thereof is the distance between the two boundary division lines of the load-bearing wall to be demolished. The arrangement spacing of the vertical column members is the span of the beam members, and the bearing capacity of the beam members during the demolition process should meet the requirements.

[0043] The present application replaces the traditional scaffold support system, reduces the space occupancy rate of the scaffold support system, or eliminates the need to set up the scaffold support system, reduces the impact on the subsequent construction operation space, avoids cross-operation in the same space, and can significantly improve safety and construction efficiency and save costs.

[0044] The cross-sectional size of the horizontal beam members 3, the vertical column members 4 or their combination should be determined based on the permanent remaining structure zero damage principle; the permanent remaining structure zero damage principle is that the self-supporting structure formed by the horizontal beam members 3, the vertical column members 4 or their combination, after establishing a finite element calculation model with the overall structure and analyzing and calculating, the stress value of the original structure that continues to exist and use should be less than the design value of the tensile strength.

[0045] The cross-sectional size of the horizontal beam members 3, the vertical column members 4 or their specific combination should be determined based on the temporary remaining local structure minimum safety reserve principle; the temporary remaining local structure minimum safety reserve principle is that the self-supporting structure formed by the horizontal beam members 3, the vertical column members 4 or their combination, after establishing a finite element calculation model with the overall structure and analyzing and calculating, the self-supporting structure can be allowed to crack, but needs to meet the bearing capacity limit state.

[0046] When calculating and determining the cross-sectional dimensions of the horizontal beam members 3, vertical column members 4 or their combinations, the principle of minimizing interference with subsequent construction for temporarily retained local structures should be based; the temporarily retained local structure meets the principle of minimizing interference with subsequent construction, which is a self-supporting structure formed by the horizontal beam members 3, vertical column members 4 or their combinations, and part or all of it can be a component of the subsequent reinforcement structure, or does not affect the construction of the subsequent reinforcement structure or the new structure. At the same time, the workload of its own demolition should be less than the workload of scaffolding support erection and demolition.

[0047] For different schemes of using the horizontal beam members, vertical column members and their specific combinations of the present invention as temporary support structures for demolition construction, the following three principles are used for determination: the principle of zero damage to permanently retained structures; the principle that temporarily retained local structures meet the minimum safety reserve; the principle of minimizing interference of temporarily retained local structures with subsequent construction.

[0048] As Figure 1 shown in the topmost and lowermost layers of , when only the horizontal beam member 3 exists, the horizontal beam member 3 is clamped between the boundary dividing lines 1 of two to-be-demolished load-bearing walls to form a "square" shape.

[0049] As Figure 1 shown in the second layer of , when there is a combination of the horizontal beam member 3 and the vertical column member 4, the horizontal beam member 3 and the vertical column member 4 form a "T" shape.

[0050] As Figure 1 shown in the third layer of , when there is a combination of the horizontal beam member 3 and the vertical column member 4, the horizontal beam member 3 and the vertical column member 4 form a "pi" shape.

[0051] Embodiment 2:

[0052] Using the protective demolition construction method of a multi-story and high-rise reinforced concrete load-bearing wall self-supporting structure in Embodiment 1, the specific steps are as follows:

[0053] Step 1. Determine the cross-sectional dimensions and positions of the horizontal beam members 3 or / and vertical column members 4 of each layer of load-bearing walls.

[0054] Refer to the appendix Figure 1 . Before starting construction, use the finite element analysis method to conduct a force simulation analysis on the whole process of the demolition construction of the to-be-demolished load-bearing wall, and determine the reasonable cross-sectional dimensions of the horizontal beam member 3 and the vertical column member 4 according to the principle of zero damage to permanently retained structures, the principle that temporarily retained local structures meet the minimum safety reserve, and the principle of minimizing interference of temporarily retained local structures with subsequent construction.

[0055] Step 2, determine the boundary division line 1 of the load-bearing wall to be demolished based on the position of the horizontal beam member 3 and / or vertical column member 4 on the load-bearing wall; the horizontal beam member 3 and / or vertical column member 4 is defined between two boundary division lines 1 of the load-bearing wall to be demolished.

[0056] According to the design drawings of each layer structure demolition part, determine the reinforced concrete load-bearing wall to be demolished on site, measure the line, determine the boundary division line 1 of the load-bearing wall to be demolished, and mark it clearly.

[0057] Step 3, remove the items or loads on the load-bearing wall, and ensure the safety of the construction area of the load-bearing wall to be demolished;

[0058] Take targeted safety protection measures for the construction area of the load-bearing wall to be demolished to ensure the safety of personnel during construction. Before construction, it should be confirmed that the structure of the construction area of the layer where the load-bearing wall to be demolished is located has been unloaded, and there is no other external items or loads. Check that there are no other factors that may cause construction to stop or be dangerous, such as the wall buried wire has been disconnected, the fire box has been removed, etc.

[0059] Step 4, refer to the attached Figure 2 , according to the horizontal beam member boundary line 6 positioning, install the special guide rail 7 used for the wall saw 10, and fix it with anchor bolts 8. The installation process can use a laser positioning instrument to ensure the levelness of the special guide rail 7 connection.

[0060] Step 4, refer to the attached Figure 2 , the wall saw 10 moves along the horizontal beam member boundary line 6, and cuts according to the principle of horizontal direction from left to right or right to left, cutting off the connection between the horizontal beam member 3 and the load-bearing wall to be demolished 2.

[0061] Step 4, refer to the attached Figure 3 , after the horizontal cutting of the wall saw 10 is completed, vertical cutting is performed. According to the vertical column boundary line 9, install the special guide rail 7 used for the wall saw 10, and fix it with anchor bolts 8. The installation process uses a laser positioning instrument to ensure the perpendicularity of the special guide rail 7 connection.

[0062] Step 4, the wall saw 10 moves along the vertical column boundary line 9, and cuts according to the principle of vertical direction from top to bottom, cutting off the connection between the vertical column member 4 and the load-bearing wall to be demolished 2.

[0063] Refer to the attached Figure 3 , the wall saw is cooled with water during cutting, and the dust is washed away. The cutting depth is controlled by the wall saw 10 operation panel, but the cutting depth should not exceed 200mm each time, and the cutting is deepened step by step in a shallow cutting and fast running mode. Avoid cutting too deep, and the diamond saw blade of the wall saw will be deformed under stress, and even mechanical injury accidents may occur.

[0064] Step 5, refer to the attached Figure 4 , the wall between the two to-be-removed load-bearing wall boundary division lines 1 of the to-be-removed load-bearing wall 2 is broken and removed, and the horizontal beam type component 3 and / or the vertical column type component 4 is reserved.

[0065] The hydraulic shear 11 is used to break along the horizontal direction from the proximal end to the distal end, and after breaking to the position of the to-be-removed load-bearing wall boundary division line, the breaking is moved from the distal end to the proximal end, and the breaking route is S-shaped.

[0066] Step 6, refer to the attached Figure 4 , after the to-be-removed load-bearing wall is removed to the bottom distance of the lower floor 200mm, the breaking by the hydraulic shear is stopped.

[0067] The remaining 200mm height of the to-be-removed load-bearing wall is chiseled by the electric grab 12, and the purpose is to prevent the hydraulic shear from being broken to the lower floor.

[0068] Step 7, when the to-be-removed load-bearing wall in each layer is removed, the to-be-removed load-bearing wall is removed in the order from one side to the other side, until the self-supporting structure composed of the horizontal beam type component 3, the vertical column type component 4 and the combination thereof is formed.

[0069] The construction waste after removal is timely cleaned and transported to the garbage station to avoid stacking and affecting the safety of the structure.

[0070] Step 8, new structures or reinforcing components are added in each layer, and after the new structures or reinforcing components form a stable permanent structure, the self-supporting structure composed of the horizontal beam type component 3, the vertical column type component 4 and the combination thereof is removed.

[0071] Step 9, the section formed after the self-supporting structure is removed is smoothed by high-strength polymer mortar, and curing treatment is performed.

[0072] The multi-high-rise reinforced concrete load-bearing wall self-supporting structure and protective demolition construction method, including the horizontal beam type component, the vertical column type component and the specific combination thereof formed by the wall segment temporarily reserved in the demolition process, is used as a temporary supporting structure for the demolition construction.

[0073] The application reasonably utilizes the local wall segment temporarily reserved by the removed structure as a temporary support, and compared with the scaffold supporting system, the application is more stable, significantly improves the safety of the multi-high-rise reinforced concrete load-bearing wall structure in the demolition process, reduces or even completely eliminates the erection of the scaffold supporting system in the construction process, thereby greatly reducing the construction space occupancy rate, reducing the influence on the subsequent construction operation space, avoiding the cross operation in the same space, obviously improving the safety and construction efficiency, and saving the cost; the demolition construction operation still uses the mechanical equipment of the traditional static demolition or the dynamic and static force combined demolition, and is convenient for popularization and application.

[0074] The application is described above with reference to the drawings, and it is obvious that the implementation of the application is not limited by the above manner, as long as various improvements are made by using the method concept and technical scheme of the application, or the concept and technical scheme of the application is directly applied to other occasions without improvement, which are all within the protection scope of the application.

Claims

1. A construction method for a multi-story reinforced concrete load-bearing wall self-supporting structure, characterized in that: By temporarily retaining a portion of the load-bearing wall to be demolished (2), a horizontal beam component (3), a vertical column component (4), or a combination of both are formed. The horizontal beam component (3) is located at the bottom elevation of the floor slab (5) on each floor, and the vertical column component (4) is located on each floor to reduce the span of the horizontal beam component (3). The horizontal beam component (3) and the vertical column component (4) are perpendicular to each other. The horizontal beam component (3) and / or the vertical column component (4) are sandwiched between the boundary dividing lines (1) of the two load-bearing walls to be demolished. After the load-bearing wall (2) to be demolished between the boundary dividing lines (1) of the two load-bearing walls to be demolished is demolished, the retained horizontal beam component (3) and / or vertical column component (4) form a self-supporting structure that replaces the scaffolding support system. The construction method includes the following steps: Step 1: Determine the cross-sectional dimensions and location of the horizontal beam members (3) and / or vertical column members (4) of each load-bearing wall; use the finite element analysis method to perform stress simulation analysis on the entire process of demolishing the load-bearing wall to be demolished, and determine the reasonable cross-sectional dimensions of the horizontal beam members (3) and vertical column members (4) based on the principles of zero damage to the permanently retained structure, minimum safety reserve for the temporarily retained local structure, and minimum interference of the temporarily retained local structure to subsequent construction: The principle of zero damage to the permanently retained structure refers to the establishment and analysis of finite element calculation models of the self-supporting structure and the overall structure. For the original structure that continues to exist and be used, its stress value must be less than the design value of tensile strength; the principle of minimum safety reserve for temporarily retained local structures means that after establishing a finite element calculation model and analyzing the self-supporting structure and the overall structure, the self-supporting structure can be allowed to crack, but it needs to meet the ultimate limit state of bearing capacity; the principle of minimum interference of temporarily retained local structures to subsequent construction means that the self-supporting structure can be partially or entirely used as a component of the subsequent reinforcement structure, or does not affect the construction of the subsequent reinforcement structure or new structure, and at the same time, its own demolition workload should be less than the workload of scaffolding support erection and dismantling; Step 2: Determine the boundary dividing line (1) of the load-bearing wall to be demolished based on the position of the horizontal beam member (3) and / or the vertical column member (4) on the load-bearing wall; the horizontal beam member (3) and / or the vertical column member (4) are confined between the two boundary dividing lines (1) of the load-bearing wall to be demolished; Step 3: Remove items or loads from the load-bearing walls and ensure the safety of the construction area where the load-bearing walls to be demolished are to be secured. Step 4: Position the guide rail (7) used for the wall saw (10) according to the boundary line (6) of the horizontal beam component. The guide rail (7) is fixed with anchor bolts (8). The wall saw (10) moves along the boundary line (6) of the horizontal beam component and cuts from left to right or from right to left in the horizontal direction to sever the connection between the horizontal beam component (3) and the load-bearing wall (2) to be demolished. Or / and, position the guide rail (7) for installing the wall saw (10) according to the vertical columnar boundary line (9), and fix it with anchor bolts (8); the wall saw (10) moves along the vertical columnar boundary line (9) and cuts according to the principle from top to bottom in the vertical direction to cut off the connection between the vertical columnar member (4) and the to-be-demolished load-bearing wall (2). Step 5. Perform breaking and demolition on the wall between the two to-be-demolished load-bearing wall boundary dividing lines (1) of the to-be-demolished load-bearing wall (2), and retain the horizontal beam member (3) and / or vertical columnar member (4). Step 6. After the to-be-demolished load-bearing wall (2) is demolished to a distance of 200 mm from the lower floor slab at the bottom, stop using the hydraulic shear for breaking. Step 7. Repeat the above steps 1-6 for demolishing the to-be-demolished load-bearing wall (2) on each floor, and demolish it in the order from one side to the other side until a self-supporting structure composed of horizontal beam members (3), vertical columnar members (4) or their combination is formed. Step 8. Add new structures or strengthening members on each floor. After the new structures or strengthening members form a stable permanent structure, demolish the self-supporting structure composed of horizontal beam members (3), vertical columnar members (4) or their combination.

2. The construction method of the multi-story and high-rise reinforced concrete load-bearing wall self-supporting structure according to claim 1, wherein: Step 9. Smooth the section formed after demolishing the self-supporting structure with high-strength polymer mortar and perform maintenance treatment.

3. The construction method of the multi-story and high-rise reinforced concrete load-bearing wall self-supporting structure according to claim 1, wherein: During the cutting process of the wall saw (10) in Step 4, water is used for cooling and to wash away the powder chips; the cutting depth is adjusted by controlling the operation panel of the wall saw (10), but the cutting depth each time should not exceed 200 mm, and a step-by-step deeper cutting is performed back and forth in the way of shallow cutting and fast running; avoid excessive cutting depth, so that the diamond saw blade of the wall saw is deformed under stress, and even mechanical injury accidents may occur. Or / and, in Step 5, the hydraulic shear (11) is first used to break from the proximal end to the distal end in the horizontal direction. After breaking to the position of the to-be-demolished load-bearing wall boundary dividing line, it is then moved from the distal end to the proximal end for breaking, and the breaking route is S-shaped. Or / and, in Step 6, the remaining 200 mm high to-be-demolished load-bearing wall is chiseled with a pneumatic pick (12) to prevent the hydraulic shear from damaging the lower floor.

4. The construction method of the multi-story reinforced concrete load-bearing wall self-supporting structure according to claim 1, characterized in that: When only the horizontal beam member (3) exists, the horizontal beam member (3) is clamped between the two to-be-demolished load-bearing wall boundary dividing lines (1) to form a "mouth" shape.

5. The construction method of the multi-story reinforced concrete load-bearing wall self-supporting structure according to claim 1, characterized in that: When a combination of the horizontal beam member (3) and the vertical columnar member (4) exists, the horizontal beam member (3) and the vertical columnar member (4) form a "T" shape.

6. The construction method of the multi-story reinforced concrete load-bearing wall self-supporting structure according to claim 1, characterized in that: When a combination of the horizontal beam member (3) and the vertical columnar member (4) exists, the horizontal beam member (3) and the vertical columnar member (4) form a "π" shape.

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