Construction method for removing indoor mechanical hoisting external wall panel of existing building

Abstract

The invention discloses a construction method for dismantling an indoor mechanical hoisting external wall panel of an existing building, and relates to the field of wall dismantling, and the construction method comprises the following specific steps: step 1, determining an external wall panel partitioning scheme; 2, drilling and seam removing are conducted on the wall plate; thirdly, a crane is arranged; step 4, cutting and disassembling the board; and fifthly, the plates are transported. According to the method, the small hoisting equipment is arranged in the upper floor of the wallboard to be dismantled, the wallboard which is segmented in advance is hoisted, and the board is transferred to a buffer pad preset on the floor of the floor, so that the operation safety is ensured; the whole dismantling process can be interspersed in order, the construction period is obviously shortened, and interference to work and life of surrounding residents is small.

Description

Technical Field

[0001] This invention relates to the field of wall demolition, and more particularly to a construction method for demolishing exterior wall panels in existing buildings using mechanical hoisting. Background Technology

[0002] In exterior wall panel demolition projects, when site conditions permit, large vertical transportation equipment such as truck cranes and tower cranes are usually used for direct hoisting and demolition. However, most existing buildings are located in bustling urban areas, and due to limited space and surrounding environment, it is often impossible to install large lifting machinery.

[0003] Currently, the "wall saw cutting + chain hoisting" process is commonly used. This method can achieve the dismantling of wall panels in sections under limited site conditions, but it has high requirements for process connection and multi-layer collaborative construction is difficult. The direction and magnitude of the impact force generated at the moment of wall panel cutting are not easy to control, which may have an adverse effect on the original main structure. Summary of the Invention

[0004] (a) Purpose of the invention

[0005] In view of this, the purpose of this invention is to propose a construction method for demolishing exterior wall panels in existing buildings using mechanical hoisting. This method uses small hoisting equipment set up on the floor above the wall panels to be demolished to hoist the pre-divided wall panels and transfer them to a pre-set buffer pad on the floor to ensure operational safety. This method designs the entire demolition process to be orderly, saves time, and minimizes disruption to the work and life of surrounding residents.

[0006] (II) Technical Solution

[0007] To achieve the above technical objectives, this invention provides a method for demolishing exterior wall panels in existing buildings using mechanical hoisting, with the specific steps as follows:

[0008] Step 1: Determine the exterior wall panel segmentation plan

[0009] Based on the existing building as-built drawings and on-site measured data, the structural form of the precast exterior wall panels and their connection method with the main structure are determined. Then, combined with the load-bearing capacity of the structural floor slabs and the indoor rated lifting capacity, the segmentation scheme of the exterior wall panels is determined, and the intra-floor water flow and inter-floor water flow are designed.

[0010] Step 2: Drilling and Grooving Holes in Wall Panels

[0011] Clean the finishing layer down to the base layer of the exterior wall panel structure;

[0012] According to the block division plan, horizontal and vertical dividing lines are made on the base layer of the exterior wall panel structure, and the exterior wall panel structure is divided into several exterior wall panel blocks by the dividing lines.

[0013] Hanging holes are made above each section of the exterior wall panel;

[0014] Cut joints in the outer wall panels according to the dividing lines to create gaps;

[0015] Step 3: Crane Setup

[0016] Multiple cranes are arranged according to the direction of water flow between floors;

[0017] Step 4: Cutting and disassembling the panels

[0018] Based on the joints, the exterior wall panels are cut into several exterior wall panel sections;

[0019] Before cutting, the crane's slings are connected to the lifting holes of the exterior wall panels to ensure stability during the cutting process.

[0020] After cutting, the exterior wall panels are stacked in sections at the designated locations on the floor. During the demolition process, the original reinforcement inside the exterior wall panels is retained first. After hoisting and installation, the surrounding reinforcement of the corresponding exterior wall panel sections is cut to disconnect them from the surrounding structure.

[0021] Step 5: Plate Transportation

[0022] Based on the flow direction within and between floors, the stacked exterior wall panels are divided into sections and horizontally transported by electric transport vehicles, then vertically transported between floors by construction elevators, and finally transported by construction elevators to a special storage yard on the first floor outdoor ground.

[0023] As a further description of the above technical solution: the specific method for determining the exterior wall panel segmentation scheme in step one is as follows: Treat the exterior wall panels of a region as a whole, and segment the exterior wall panels of this whole into blocks, wherein:

[0024] The weight of each segment of the exterior wall panel is less than the total shear and tensile bearing capacity of the structural steel bars on any side of the overall exterior wall panel, ensuring that the panel itself remains stable during the cutting and separation process;

[0025] The weight of each section of the exterior wall panel is less than 1 / 6 of the rated lifting capacity of the crane;

[0026] The width of the exterior wall panel segments is less than 80% of the width of structural openings and passageways in the water flow path within each floor.

[0027] The length of each external wall panel segment is less than 40% of the length of the construction elevator car and less than 20% of the length of the loading surface of the horizontal transport equipment, in order to facilitate bulk transportation.

[0028] As a further description of the above technical solution: the specific method for designing the floor-to-floor water flow in step one is as follows:

[0029] Design of internal flow: Based on the path of the exterior wall panels on each floor, the exterior wall panels on each floor are divided into multiple flow sections. Each flow section is equipped with an independent construction space. The cutting and transportation directions of the exterior wall panels in the flow section on the same floor are consistent.

[0030] As a further description of the above technical solution: the specific method for designing inter-floor water flow in step one is as follows: designing inter-floor water flow: according to the number of floors, the floors are divided into several inter-floor water flow areas from top to bottom, and adjacent inter-floor water flow areas are transported at intervals.

[0031] As a further description of the above technical solution: In step two, the drilling and grouting of the wall panel:

[0032] When creating hanging holes above each exterior wall panel segment, the diameter of the hanging holes should be 50mm.

[0033] As a further description of the above technical solution: In step two, the drilling and grouting of the wall panel:

[0034] Each exterior wall panel segment has at least two lifting holes. The distance between the opening position of the lifting hole and the top surface or cut surface of the exterior wall panel segment is greater than 200mm. Reinforcing bars are left between the lifting hole and the top surface or cut surface of the exterior wall panel segment. The lifting holes on the same exterior wall panel segment are at the same horizontal position.

[0035] As a further description of the above technical solution: In the crane arrangement in step three, the number of cranes is consistent with the number of flow sections divided by the floor exterior wall panels, and they are respectively set in the construction space corresponding to each flow section.

[0036] As a further description of the above technical solution: the specific steps of cutting the exterior wall panel into several exterior wall panel blocks according to the joints in step four are as follows: cut each joint from top to bottom according to the water flow direction between layers, so that the exterior wall panel blocks are gradually divided from top to bottom, and when cutting the exterior wall panel blocks, the cutting is carried out in the process of cutting the vertical joints first and then cutting the horizontal joints.

[0037] As a further description of the above technical solution: Step four also includes the arrangement of buffer pads: before stacking the exterior wall panels into blocks at predetermined positions on the floor, a predetermined buffer pad is placed so that the exterior wall panels can be placed on the buffer pad.

[0038] As a further description of the above technical solution, it also includes trial disassembly, with the specific steps as follows:

[0039] Before officially commencing large-scale demolition of exterior wall panels, a trial demolition area is selected, and the area is surveyed and marked. Based on the marked exterior wall panels, the panels are cut with joints, hoisted, and transported to the designated location on the floor.

[0040] In the above technical solution, the present invention provides a construction method for demolishing exterior wall panels in existing buildings using mechanical hoisting. This method involves setting up small hoisting equipment on the floor above the wall panels to be demolished, hoisting the pre-divided wall panels, and transferring the panels to a pre-set buffer pad on the floor to ensure operational safety. Before construction, based on a thorough understanding of the original structural design conditions, and considering factors such as the engineering environment, the rated lifting capacity of the hoist, and the floor slab bearing capacity, a comprehensive plan for hoisting the entire panel or in sections is determined. Finally, this method designs the entire demolition process to ensure it is well-organized, saves time, and minimizes disruption to the work and lives of surrounding residents. Furthermore, during the demolition process, manual hand tools are used to chisel away at the exterior wall panels, preserving the original reinforcement within the panels. The reinforcement around the corresponding sections of the exterior wall panels is then cut during hoisting. Therefore, the cutting of the wall panels is easier to control and will not adversely affect the original main structure. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0042] Figure 1 This invention provides an overall flowchart of a construction method for mechanically hoisting and demolishing exterior wall panels inside an existing building.

[0043] Figure 2 This is a schematic diagram illustrating how the exterior wall panels of an existing building are divided into multiple flow sections in a mechanical hoisting method for demolishing exterior wall panels inside an existing building, as provided by the present invention.

[0044] Figure 3 This invention provides a schematic diagram illustrating the transportation direction of an existing building's exterior wall panel demolition method, which divides the floor's exterior wall panels into multiple flow sections.

[0045] Figure 4 This invention provides a schematic diagram of the water flow direction between floors in a construction method for demolishing exterior wall panels using mechanical hoisting in an existing building. Detailed Implementation

[0046] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0047] like Figure 1 - Figure 4 As shown: This embodiment provides a technical solution: a method for demolishing exterior wall panels in existing buildings using mechanical hoisting, the specific steps of which are as follows:

[0048] Step 1: Determine the exterior wall panel segmentation plan

[0049] Based on the existing building as-built drawings and on-site measured data, the structural form of the precast exterior wall panels and their connection method with the main structure are determined. Then, combined with the load-bearing capacity of the structural floor slabs and the indoor rated lifting capacity, the segmentation scheme of the exterior wall panels is determined, and the intra-floor water flow and inter-floor water flow are designed.

[0050] Step 2: Drilling and Grooving Holes in Wall Panels

[0051] Clean the finishing layer down to the base layer of the exterior wall panel structure;

[0052] According to the block division plan, horizontal and vertical dividing lines are made on the base layer of the exterior wall panel structure, and the exterior wall panel structure is divided into several exterior wall panel blocks by the dividing lines.

[0053] Hanging holes are made above each section of the exterior wall panel;

[0054] Cut joints in the outer wall panels according to the dividing lines to create gaps;

[0055] Step 3: Crane Setup

[0056] Multiple cranes are arranged according to the direction of water flow between floors;

[0057] Step 4: Cutting and disassembling the panels

[0058] Based on the joints, the exterior wall panels are cut into several exterior wall panel sections;

[0059] Before cutting, the crane's slings are connected to the lifting holes of the exterior wall panels to ensure stability during the cutting process.

[0060] After cutting, the exterior wall panels are stacked in sections at the designated locations on each floor;

[0061] Step 5: Plate Transportation

[0062] Based on the flow direction within and between floors, the stacked exterior wall panels are divided into sections and horizontally transported by electric transport vehicles, then vertically transported between floors by construction elevators, and finally transported by construction elevators to a special storage yard on the first floor outdoor ground.

[0063] It should also be noted that during the demolition process, manual hand tools were used to chisel away at the exterior wall panels. During this process, the original reinforcement inside the exterior wall panels was preserved. After hoisting and installation, the surrounding reinforcement of the corresponding exterior wall panel sections was cut to completely sever its connection with the surrounding structure before hoisting and demolition.

[0064] Specifically, the method for determining the exterior wall panel segmentation scheme in step one is as follows: Treat the exterior wall panels of a region as a whole, and then segment the exterior wall panels of this whole into blocks, wherein:

[0065] The weight of each segment of the exterior wall panel is less than the total shear and tensile bearing capacity of the structural steel bars on any side of the overall exterior wall panel, ensuring that the panel itself remains stable during the cutting and separation process;

[0066] The weight of each section of the exterior wall panel is less than 1 / 6 of the rated lifting capacity of the crane;

[0067] The width of the exterior wall panel segments is less than 80% of the width of structural openings and passageways in the water flow path within each floor.

[0068] The length of each external wall panel segment is less than 40% of the length of the construction elevator car and less than 20% of the length of the loading surface of the horizontal transport equipment, in order to facilitate bulk transportation.

[0069] Specifically, the method for designing the internal water flow within each floor in step one is as follows:

[0070] Design of internal flow: Based on the path of the exterior wall panels on each floor, the exterior wall panels on each floor are divided into multiple flow sections. Each flow section is equipped with an independent construction space. The cutting and transportation directions of the exterior wall panels in the flow section on the same floor are consistent.

[0071] Specifically, the method for designing inter-floor water flow in step one is as follows: Design inter-floor water flow: Based on the number of floors, the floors are divided into several inter-floor water flow areas from top to bottom, and adjacent inter-floor water flow areas use interval transportation.

[0072] Specifically, in step two, drilling and chiseling the wall panels:

[0073] When creating hanging holes above each exterior wall panel segment, the diameter of the hanging holes should be 50mm.

[0074] Specifically, in step two, drilling and chiseling the wall panels:

[0075] Each exterior wall panel segment has at least two lifting holes. The distance between the opening position of the lifting hole and the top surface or cut surface of the exterior wall panel segment is greater than 200mm. Reinforcing bars are left between the lifting hole and the top surface or cut surface of the exterior wall panel segment. The lifting holes on the same exterior wall panel segment are at the same horizontal position.

[0076] Specifically, in the crane arrangement in step three, the number of cranes is consistent with the number of flow sections divided by the floor exterior wall panels, and they are respectively set in the construction space corresponding to each flow section.

[0077] Specifically, in step four, the steps for cutting the exterior wall panel into several sections according to the joints are as follows: cut each joint from top to bottom according to the water flow direction between layers, so that the exterior wall panel sections are gradually divided from top to bottom. When cutting the exterior wall panel sections, the cutting is carried out in the process of cutting the vertical joints first and then the horizontal joints.

[0078] Specifically, step four also includes the arrangement of buffer pads: before stacking the exterior wall panels into predetermined positions on the floor, a predetermined buffer pad is placed so that the exterior wall panels can be placed on the buffer pad.

[0079] Specifically, this also includes trial disassembly, with the following steps:

[0080] Before officially commencing large-scale demolition of exterior wall panels, a trial demolition area is selected, and the area is surveyed and marked. Based on the marked exterior wall panels, the panels are cut with joints, hoisted, and transported to the designated location on the floor.

[0081] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A method for demolishing exterior wall panels in an existing building using mechanical hoisting, characterized in that, The specific steps are as follows: Step 1: Determine the exterior wall panel segmentation plan Based on the existing building as-built drawings and on-site measured data, the structural form of the precast exterior wall panels and their connection method with the main structure are determined. Then, combined with the load-bearing capacity of the structural floor slabs and the indoor rated lifting capacity, the segmentation scheme of the exterior wall panels is determined, and the intra-floor water flow and inter-floor water flow are designed. Step 2: Drilling and Grooving Holes in Wall Panels Clean the finishing layer down to the base layer of the exterior wall panel structure; According to the block division plan, horizontal and vertical dividing lines are made on the base layer of the exterior wall panel structure, and the exterior wall panel structure is divided into several exterior wall panel blocks by the dividing lines. Hanging holes are made above each section of the exterior wall panel; Cut joints in the outer wall panels according to the dividing lines to create gaps; Step 3: Crane Setup Multiple cranes are arranged according to the direction of water flow between floors; Step 4: Cutting and disassembling the panels Based on the joints, the exterior wall panels are cut into several exterior wall panel sections; Before cutting, the outer wall panels are divided into sections, and the crane's slings are connected to the lifting holes of the outer wall panel sections. After cutting, the exterior wall panels are stacked in sections at the designated locations on the floors. During the demolition process, the original reinforcement inside the exterior wall panels is retained first. After hoisting and installation, the surrounding reinforcement of the corresponding exterior wall panel sections is cut to disconnect them from the surrounding structure. Step 5: Plate Transportation Based on the flow direction within and between floors, the stacked exterior wall panels are divided into sections and horizontally transported by electric transport vehicles, then vertically transported between floors by construction elevators, and finally transported by construction elevators to a special storage yard on the first floor outdoor ground.

2. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 1, is characterized in that... The specific method for determining the exterior wall panel segmentation scheme in step one is as follows: Treat the exterior wall panels of a region as a whole, and then segment the exterior wall panels of this whole into blocks, wherein: The weight of each segment of the exterior wall panel is less than the total shear and tensile bearing capacity of the structural reinforcement on any side of the overall exterior wall panel; The weight of each section of the exterior wall panel is less than 1 / 6 of the rated lifting capacity of the crane; The width of the exterior wall panel segments is less than 80% of the width of structural openings and passageways in the water flow path within each floor. The length of the exterior wall panel segment is less than 40% of the length of the construction elevator car and less than 20% of the length of the cargo surface of the horizontal transport equipment.

3. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 1, is characterized in that... The specific method for designing the internal water flow within each floor in step one is as follows: Design of internal flow: Based on the path of the exterior wall panels on each floor, the exterior wall panels on each floor are divided into multiple flow sections. Each flow section is equipped with an independent construction space. The cutting and transportation directions of the exterior wall panels in the flow section on the same floor are consistent.

4. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 3, is characterized in that... The specific method for designing inter-floor water flow in step one is as follows: Design inter-floor water flow: Based on the number of floors, divide the floors into several inter-floor water flow areas from top to bottom, and use interval transportation between adjacent inter-floor water flow areas.

5. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 1, is characterized in that... In step two, drilling and chiseling the wall panels: When creating hanging holes above each exterior wall panel segment, the diameter of the hanging holes should be 50mm.

6. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 5, is characterized in that... In step two, drilling and chiseling the wall panels: Each exterior wall panel segment has at least two lifting holes. The distance between the opening position of the lifting hole and the top surface or cut surface of the exterior wall panel segment is greater than 200mm. Reinforcing bars are left between the lifting hole and the top surface or cut surface of the exterior wall panel segment. The lifting holes on the same exterior wall panel segment are at the same horizontal position.

7. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 3, is characterized in that... In the crane arrangement in step three, the number of cranes is consistent with the number of flow sections divided by the floor exterior wall panels, and they are respectively set in the construction space corresponding to each flow section.

8. The method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 1, is characterized in that... The specific steps for cutting the exterior wall panel into several sections according to the joints in step four are as follows: cut each joint from top to bottom according to the water flow direction between layers, so that the exterior wall panel sections are gradually divided from top to bottom. When cutting the exterior wall panel sections, the cutting is carried out in the process of cutting the vertical joints first and then cutting the horizontal joints.

9. A method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 1, characterized in that... Step four also includes the arrangement of buffer pads: before stacking the exterior wall panels into blocks at predetermined positions on the floor, a buffer pad is pre-set at the predetermined position so that the exterior wall panels can be placed on the buffer pad.

10. A method for demolishing exterior wall panels in an existing building using mechanical hoisting, as described in claim 1, characterized in that... It also includes trial disassembly, with the specific steps as follows: Before officially commencing large-scale demolition of exterior wall panels, a trial demolition area is selected, and the area is surveyed and marked. Based on the marked exterior wall panels, the panels are cut with joints, hoisted, and transported to the designated location on the floor.

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