A system construction method for dismantling a flower basket scaffold H-beam

Abstract

The present application relates to a kind of flower basket scaffold system construction method of dismantling I-beam, belong to the technical field of construction engineering.For the problems of high safety risk, large site occupation, cost increase and environmental protection not up to standard, etc. existing in traditional automobile crane dismantling end cantilever I-beam, the present application strategically retains the diagonal rod to maintain the lateral stability of the I-beam when the scaffold is conventionally dismantled to the transition state of only retaining the diagonal rod and cantilever I-beam, and uses the construction basket that has been installed and accepted to receive the I-beam from below, replacing the vertical support of the original main structure. Under the double-constraint system formed by the lateral constraint of the diagonal rod and the vertical support of the basket, the separation of the I-beam and the main structure and ground transportation are completed. The present application does not require additional large machinery, and achieves the synergistic optimization of safety, construction period, cost and environmental protection benefits.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically a systematic construction method for dismantling the I-beams of a flower basket scaffold. Background Technology

[0002] Basket scaffolding (also known as top-mounted cantilever scaffolding) is widely used in the exterior wall construction of high-rise and super high-rise buildings. Its cantilevered I-beams are bolted to the outside of the main structure, and diagonal braces provide lateral stability. When the project progresses to the scaffolding dismantling stage, the conventional dismantling process is to remove layers from top to bottom, sequentially removing toe boards, footboards, safety nets, horizontal bars, and wall ties. However, when dismantling the final cantilevered I-beams, because there is no scaffolding support system below them, forming a free cantilever component, their dismantling becomes the most technically challenging and high-risk part of the entire dismantling operation.

[0003] In existing technologies, the dismantling of cantilevered H-beams typically involves using a truck crane in conjunction with an auxiliary steel frame. The truck crane lifts the H-beam using wire ropes, and workers then remove the bolt connections from below or the side before transporting the H-beam to the ground. However, this method has several inherent drawbacks: First, the horizontal pushing and fine-tuning of the truck crane requires highly experienced operators; even slight mistakes can cause crushing or collision accidents to the dismantling workers. Second, the single-point flexible suspension between the truck crane and the H-beam results in relatively low binding strength, making the H-beam prone to swaying or even falling during dismantling, posing a risk of falling objects from height. Third, truck crane operations require a large operating space and turning radius, necessitating prior site preparation and space reservation, which severely interferes with other concurrent construction work and can lead to worker idleness. Fourth, truck cranes are fuel-powered equipment, and their exhaust emissions contradict current green construction and sustainable development concepts.

[0004] Furthermore, existing patent literature, such as "A Novel Construction Method for Uplift Cantilever Scaffolding," mainly focuses on the erection and conventional dismantling processes of scaffolding, without providing specific solutions for the special working conditions of the cantilevered I-beams at the end of the dismantling process. Similarly, "Construction Devices, Scaffolding Systems, and Construction Methods for Scaffolding" emphasizes the design of load-bearing and positioning components during the scaffolding erection phase, without addressing the issues of support replacement and transportation of the I-beams at the end of the dismantling phase. Therefore, how to complete the dismantling of the cantilevered I-beams at the end of the flower basket scaffolding while ensuring safety, shortening the construction period, reducing costs, and meeting environmental protection requirements remains a technical problem that needs to be solved in this field. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing technologies and provide a systematic construction method for dismantling I-beams of flower basket scaffolding. It aims to solve the problems of high safety risks, construction delays, increased costs, and failure to meet environmental protection standards associated with traditional truck crane dismantling methods.

[0006] To solve the above-mentioned technical problems, the present invention is implemented as follows: A systematic construction method for dismantling H-beams of basket scaffolding involves strategically retaining the diagonal braces to maintain the lateral stability of the cantilevered H-beams during the transitional dismantling of the basket scaffolding to a state where only the diagonal braces and cantilevered H-beams remain. An installed and inspected construction scaffold is then used to support the cantilevered H-beams from below, replacing the original vertical support of the main structure. Under the dual constraint system formed by the lateral constraints of the diagonal braces and the vertical support of the scaffold, the separation of the H-beams from the main structure and their ground transfer are completed.

[0007] Specifically, it includes the following steps: S1: Dismantle the flower basket scaffolding in a progressively decreasing order, removing the toe boards, footboards, safety nets, main horizontal bars, secondary horizontal bars, and wall ties in sequence, while strategically retaining the diagonal braces and cantilevered I-beams of the flower basket scaffolding to maintain the lateral stability of the I-beams. S2: With the tie rods and cantilevered I-beams retained, install the construction scaffold and complete the acceptance test to make the scaffold ready for operation; S3: Lift the suspended platform to below the cantilevered I-beam, and detachably connect the suspended platform to the I-beam so that the suspended platform can bear the load of the I-beam from below, thereby replacing the vertical support of the original main structure; S4: Under the dual constraint system where the tie rod maintains lateral stability and the suspended platform provides vertical support, remove the bolt connection between the I-beam and the main structure; S5: The dismantled I-beams are transferred to the ground using the suspended basket.

[0008] Preferably, in S1, the conventional demolition is carried out during the day, safety warnings are set up in the work area, and the phenomenon of demolishing only one wall first is strictly prohibited.

[0009] Preferably, the installation plan for the suspended platform is prepared and technically briefed before the scaffolding is dismantled, and the suspended platform subcontractor is required to enter the site in accordance with the contract. The preferred timeframe is 30 days.

[0010] Preferably, before or simultaneously with S2, a load calculation is performed on the suspended platform operation. The load calculation includes: the suspended platform carries one suspended platform operator and one scaffolding operator, and the maximum mass corresponding to the linear mass and length of the I-beam is calculated to be less than the maximum load capacity of the suspended platform.

[0011] Preferably, the I-beam is a 22a I-beam with a linear mass of 27.9 kg / m, the maximum length of the cantilever main beam I-beam is 2.25 m, corresponding to a maximum mass of 62.8 kg, and the maximum load capacity of the suspended platform is 150 kg. The calculation results show that no reinforcement treatment is required for the suspended platform.

[0012] Preferably, in S3, the suspended platform and the I-beam are detachably connected by wire ropes and buckles, and the connection operation is performed by scaffolding workers.

[0013] Preferably, in S4, the bolted connection is dismantled by scaffold workers under the dual constraint system.

[0014] Preferably, in step S5, the hoisting operation is performed by the hoisting operator to transport the dismantled I-beams to the ground.

[0015] Preferably, S3 to S5 are repeated until all cantilevered I-beams are dismantled, scaffolding operations are withdrawn from the site, and the suspended platform is then used for structural exterior wall energy conservation and finishing construction.

[0016] The beneficial effects of this invention are as follows: As can be seen from the above technical solution, this application provides a systematic construction method for dismantling H-beams of basket scaffolding. By strategically retaining the diagonal tie rods to maintain the lateral stability of the H-beams, and simultaneously utilizing the suspended basket to support them from below to form vertical support, a dual constraint system of "bottom support + lateral tension" is constructed, completely changing the dangerous working conditions of traditional truck cranes with single-point suspension that are prone to swaying and falling. When removing bolts, the H-beams are in a stable state, eliminating the need for high-precision flat-pushing operations by truck crane operators and avoiding safety accidents caused by operational errors.

[0017] The suspended platform is an essential piece of equipment for subsequent exterior wall energy conservation and finishing construction. This solution allows it to be introduced earlier in the process by pre-positioning and coupling the process, so that it can be introduced at the end of the scaffolding dismantling stage. This eliminates the need to wait for the truck crane to arrive and the site to be prepared, avoids conflicts with other concurrent construction, eliminates the phenomenon of workers being idle, and significantly shortens the overall construction period.

[0018] The early use of the suspended platform only incurs negligible depreciation and labor costs, eliminating the need for additional rental of truck cranes and auxiliary steel frames, and avoiding large machinery operating costs, thus directly reducing construction costs.

[0019] Electric suspended platforms are powered by electricity, avoiding the emissions of pollutants such as particulate matter, carbon monoxide, and nitrogen oxides from the fuel exhaust of truck cranes. This aligns perfectly with the concept of green construction and conforms to the trend of sustainable development.

[0020] Shorter construction periods improve the turnover rate of social capital, safer and more civilized construction enhances the company's image, and cost savings are beneficial for market development and subsequent project bidding. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the elevation layout of the flower basket scaffolding in an embodiment of the present invention; Figure 2 This is a schematic diagram of the cantilevered I-beam in an embodiment of the present invention; Figure 3 This is a front view of the basket arrangement in an embodiment of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application. like Figure 1-3 The invention illustrates a systematic construction method for dismantling I-beams of basket scaffolding. Its core innovation lies in the following: when the basket scaffolding is conventionally dismantled to a transitional state where only the diagonal braces and cantilevered I-beams remain, no additional large machinery such as truck cranes is introduced. Instead, the diagonal braces are strategically retained to maintain the lateral stability of the cantilevered I-beams. At the same time, a construction basket that has been installed and accepted is used to support the I-beams from below, replacing the original vertical support of the main structure. Under the dual constraint system formed by the lateral constraint of the diagonal braces and the vertical support of the basket, the separation of the I-beams from the main structure and their ground transfer are completed safely and efficiently.

[0023] The specific construction steps are as follows: Step 1: Preparation and briefing of the construction scaffold installation plan "An army marches on its stomach." Approximately 30 days before the scaffolding is removed from service and dismantled, a plan for the suspended platform installation is prepared and technical briefings are conducted. The plan must cover the key steps of using the suspended platform as a support and transport platform for the dismantling of the I-beams, and the subcontractor of the suspended platform must strictly adhere to the contract, ensuring timely arrival on site. Simultaneously, load calculations are performed for the suspended platform operation: the platform must carry one worker and one scaffolding worker, and the maximum mass corresponding to the linear mass and length of the I-beam is verified to be less than the maximum load capacity of the suspended platform. This project uses 22a I-beams with a linear mass of 27.9 kg / m. The maximum length of the cantilevered main beam I-beam is 2.25 m, corresponding to a maximum mass of 62.8 kg, which is far less than the maximum load capacity of 150 kg for the suspended platform. Therefore, no reinforcement is needed for the suspended platform, and there will be no increase in material costs.

[0024] Step Two: Routine Dismantling of the Flower Basket Scaffolding The scaffolding dismantling must be carried out strictly according to the existing plan. During daytime work, ensure safety warnings are in place, and dismantle the toe boards, footboards, and safety nets first, then the main horizontal bars and secondary horizontal bars, and finally the wall ties. Dismantling should proceed layer by layer, and the practice of dismantling only one wall at a time is strictly prohibited. Stop dismantling when only the diagonal braces and I-beams of the basket-like scaffolding remain. Strategically retain the diagonal braces and cantilevered I-beams to maintain the lateral stability of the I-beams. Figure 1 As shown in the diagram: 1 is the diagonal brace (basket brace), 2 is the upright, 3 is the main horizontal bar, and 4 is the scissor brace. During the standard dismantling process to its final stage, only the diagonal brace 1 and the cantilevered I-beams connected to the main structure remain on the scaffold facade; all other components have been removed.

[0025] Step 3: Installation and Acceptance of Suspended Platform With the tie rods and cantilevered I-beams intact, the installation of the suspended platform begins. After the suspended platform is installed and passes inspection, operations can commence. The first step in the suspended platform work is dismantling the I-beams of the scaffolding. (For example...) Figure 3 As shown, the suspended platform is positioned below the I-beam, and the safety rope and suspension mechanism are installed according to specifications.

[0026] Step 4: Connecting the suspended platform to the I-beam. The suspended platform is raised and lowered by a single operator, and also carries one scaffold worker. Once the platform is positioned beneath the H-beam, it is securely and detachably connected to the H-beam, for example, via wire ropes and clips. This allows the platform to bear the load of the H-beam from below, replacing the original vertical support of the main structure. At this point, diagonal braces maintain the lateral stability of the H-beam, while the platform provides vertical support, forming a dual-constraint system. Figure 2 As shown, the cantilevered I-beam is bolted to the main structure via embedded parts, and this bolted connection can be safely removed under the double constraint system.

[0027] Step 5: Bolt Removal Under the dual-constraint system, scaffold workers dismantle the bolted connections between the I-beams and the wall. Because the I-beams remain stable at the moment of dismantling, there is no risk of swaying as with traditional single-point suspension by truck cranes, making the dismantling operation safe and controllable.

[0028] Step Six: Transferring the I-beam After dismantling is completed, the suspended platform operator lowers the platform to transport the I-beams to the ground, thus completing one dismantling of the scaffolding I-beams.

[0029] Step 7: Cyclic Operation and Process Handover Repeat steps four through six until the H-beams of the flower basket scaffolding are completely dismantled and the scaffolding work is removed from the site. Afterward, the suspended platform will be used for energy-saving and finishing work on the exterior walls of the structure, achieving seamless integration of equipment and resource reuse.

[0030] In summary, this invention, through process coupling and force conversion, introduces the suspended platform, originally prepared for subsequent exterior wall construction, into the final stage of scaffold dismantling. By using a dual constraint system of "bottom support + side pull" to replace the single-point suspension scheme of the traditional truck crane, it achieves synergistic optimization of safety, construction period, cost and environmental benefits without adding additional large-scale mechanical equipment.

[0031] The above are merely embodiments provided in this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A systematic construction method for dismantling I-beams of flower basket scaffolding, characterized in that: When the scaffolding is dismantled to a transitional state where only the diagonal braces and cantilevered I-beams remain, the diagonal braces are strategically retained to maintain the lateral stability of the cantilevered I-beams. The cantilevered I-beams are then supported from below by a construction scaffold that has been installed and accepted, replacing the original main structure's vertical support for the I-beams. Under the dual constraint system formed by the lateral constraint of the diagonal braces and the vertical support of the scaffolds, the separation of the I-beams from the main structure and their ground transfer are completed.

2. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 1, characterized in that, Specifically, the following steps are included: S1: Dismantle the flower basket scaffolding in a progressively decreasing order, removing the toe boards, footboards, safety nets, main horizontal bars, secondary horizontal bars, and wall ties in sequence, while strategically retaining the diagonal braces and cantilevered I-beams of the flower basket scaffolding to maintain the lateral stability of the I-beams. S2: With the tie rods and cantilevered I-beams retained, install the construction scaffold and complete the acceptance test to make the scaffold ready for operation; S3: Lift the suspended platform to below the cantilevered I-beam, and detachably connect the suspended platform to the I-beam so that the suspended platform can bear the load of the I-beam from below, thereby replacing the vertical support of the original main structure; S4: Under the dual constraint system where the tie rod maintains lateral stability and the suspended platform provides vertical support, remove the bolt connection between the I-beam and the main structure; S5: The dismantled I-beams are transferred to the ground using the suspended basket.

3. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 2, characterized in that, In S1, the conventional demolition is carried out during the day, safety warnings are set up in the work area, and it is strictly forbidden to demolish only one side of the wall first.

4. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 1, characterized in that, The installation plan for the suspended platform was prepared and technically briefed before the scaffolding was dismantled, and the suspended platform subcontractor was required to perform its contractual obligations and enter the site.

5. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 1, characterized in that, A load calculation is performed on the suspended platform operation. The load calculation includes: the suspended platform carries one suspended platform worker and one scaffolding worker, and the maximum mass corresponding to the linear mass and length of the I-beam is verified to be less than the maximum load capacity of the suspended platform.

6. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 5, characterized in that, The I-beam is a 22a I-beam with a linear mass of 27.9 kg / m. The maximum length of the cantilever main beam I-beam in this project is 2.25 m, corresponding to a maximum mass of 62.8 kg. The maximum load capacity of the suspended platform is 150 kg. The calculation results show that no reinforcement treatment is required for the suspended platform.

7. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 2, characterized in that, In S3, the suspended platform and the I-beam are detachably connected by wire ropes and buckles, and the connection operation is performed by scaffolding workers.

8. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 2, characterized in that, In S4, the bolted connection is dismantled by scaffold workers under the dual constraint system.

9. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 2, characterized in that, In S5, the suspended platform operator performs the lifting and lowering operation of the suspended platform to transport the dismantled I-beams to the ground.

10. The systematic construction method for dismantling the H-beams of the flower basket scaffolding according to claim 1, characterized in that, Repeat steps S3 to S5 until all cantilevered I-beams are dismantled, scaffolding operations are withdrawn from the site, and the suspended platform is then used for structural exterior wall energy conservation and finishing work.

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