A disassembly construction method for an ultra-large span inner tower crane

Abstract

The present invention provides a method for dismantling a tower crane within an ultra-large span. The method comprises moving a large crane to one side of a building where the tower crane is to be dismantled, transporting a small crane to the roof of the building, and laying a mechanical driving path through steel plates on the top floor of the building. The small crane is then prepared to lay additional steel plates within a 2-meter range of the erected legs, and an I-beam is laid under the additional steel plates. When dismantling the ultra-large span tower crane, the tower crane is first dismantled on the roof of the building by the small crane. The dismantled tower crane structure is then transported to the lifting radius of the large crane by a truck traveling on the mechanical driving path, and then the dismantled tower crane structure is delivered to a designated site on the ground by the large crane. This method solves the problems of inconvenient operation or costly increase in floor thickness when dismantling tower cranes within ultra-large spans of large factories. The method belongs to the field of dangerous and large-scale engineering construction.

Description

Technical Field

[0001] The invention relates to a disassembly construction method for an ultra-large span inner tower crane, and belongs to the field of dangerous and major engineering construction. Background Art

[0002] With the development of the economy, the scale of construction projects is getting larger and larger. The construction of large-scale factories has become commonplace. As the main means of transportation during the main structure construction, more and more problems have arisen in the construction and management of large-scale tower cranes. The problem that needs to be solved in the construction management of large-scale tower cranes is how to manage them well, ensure the safe operation of the tower cranes, prevent safety accidents, and reduce operating costs while meeting the construction needs.

[0003] In actual use, the disassembly of tower cranes in large-scale factory buildings with ultra-large spans all have defects to varying degrees, such as inconvenient disassembly operation or increased floor thickness and waste of costs. Therefore, there is a lack of a construction method that is simple in practice, reasonably designed, low in investment cost, easy to operate, and has good use effect, and can realize the convenient disassembly and assembly of tower cranes in ultra-large spans. Summary of the Invention

[0004] The present invention provides a method for disassembling a super-long-span tower crane, so as to solve the problems of inconvenience in operation or waste of cost due to increased floor thickness in disassembling a super-long-span tower crane in a large factory building.

[0005] In order to achieve the above purpose, it is proposed to adopt a super-large span tower crane dismantling construction method, which is to move the large crane to the side of the building where the tower crane is to be dismantled, and use the large crane to transport the small crane to the roof of the building, and lay a mechanical driving channel through steel plates on the top floor of the building. The small crane is ready to erect the support legs and add steel plates within 2 meters, and I-beams are laid under the added steel plates. When dismantling the super-large span tower crane, the tower crane is first dismantled at the upper end of the building by a small crane, and the dismantled tower crane structure is then transported to the transportation radius of the tower crane on the side of the building by a truck traveling on the mechanical driving channel, and the tower crane components are lifted by the side tower to the designated stacking site on the ground.

[0006] In the above method, in the building below the mechanical travel passage paved with steel plates, an internal frame support system is set up between the floor slabs to strengthen the support of the mechanical travel passage.

[0007] In the aforementioned method, the inner frame support system is constructed by 60 series disc-type scaffolding.

[0008] Compared with the existing technology, the present invention has the following beneficial effects: the present invention utilizes the disc support system during the construction process of the original structure, reducing the input of labor and frame materials, achieving secondary material utilization, and after the tower crane is dismantled, the disc support system can be removed and reused, thereby saving construction costs to a certain extent and meeting the requirements of the city's image. Therefore, the present invention is not only simple in method, reasonable in design, low in investment cost, and has good use effect and can be reused, but also all parts are made of steel, the structure is reliable, and all used materials are reusable, making it a resource-saving, environmentally friendly green product suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0010] Figure 2 This is a schematic diagram of tower crane disassembly. DETAILED DESCRIPTION

[0011] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0012] Example

[0013] Reference Figure 1 and Figure 2 The present embodiment provides a method for dismantling a tower crane with an extra-large span. The method comprises the following steps: moving a large crane 1 to one side of a building where the tower crane is to be dismantled, transporting a small crane 5 to the upper end of the building, and laying a mechanical driving passage through steel plates 3 on the top floor of the building. The small crane 5 is ready to lay additional steel plates 3 within a range of 2 meters to set up the supporting legs, and laying I-beams 4 under the additional steel plates 3. When dismantling a tower crane with an extra-large span, the tower crane is first dismantled at the upper end of the building by the small crane 5. The dismantled tower crane structure is then transported to the transportation radius of the tower crane at the side of the building by a truck traveling on the mechanical driving passage. The tower crane components are then hoisted by the side tower to a designated stacking site on the ground.

[0014] Within the building below the mechanical access road, which is paved with steel plate 3, an internal support system 2 is installed between the floor slabs as the primary load-bearing element for demolition work, strengthening the mechanical access road. This internal support system 2 is constructed from 60-series interlocking scaffolding. The steel plate road (mechanical access road) serves as a temporary storage area for tower crane components; any storage outside the steel plate road is strictly prohibited. The mechanical access road will not be laid until the roof slabs reach their designed strength. The support frame beneath the slabs will remain in place to provide support and stability.

[0015] In specific implementation, the tower dismantling steps are as follows:

[0016] The first step is to take the main factory building with a length of 416 meters and a width of 270 meters as an example. The single building has a super-large span and a total of 14 tower cranes are arranged, 4 of which are located inside the single building. The corresponding internal frame support system 2 under the super-large span tower cranes is constructed by 60 series disc-shaped scaffolding. The roof panel thickness is 120mm, the spacing of the bottom frame is: 1.8×1.8m, and the standard step distance is 1.5m; the secondary keel is 50×90mm wooden square @180mm, and the main keel is 50×100×3.0mm square steel @1800mm. Spacing between the bottom frame of the beam: 0.6m+0.9m+0.6m (horizontally)×1.5m (longitudinal); secondary purlin: 50×90mm square timber, 6 pieces are laid; distribution purlin: 50×50×2.5mm square steel @300mm; main purlin: 4 50×100×3.0mm square steel pipes; supporting beam: 2 10# channel steels; secondary purlin on the beam side: 50×90mm square timber @200mm; main purlin on the beam side: double 48.3×3.0 steel pipes, spacing 500mm; tension screws on the beam side: φ14mm, spacing: 500mm×500mm; check the stability and safety of the internal frame support system according to the design parameters, and only proceed to the next step when it is qualified.

[0017] Step 2: After verifying the internal support system (2) is qualified, the 120mm-thick reinforced concrete roof slab is positioned and laid out, creating a 7.5m-wide mechanical access path. This path is constructed using 10mm-thick, 3m x 1.5m steel plates (3) laid on the slab. The path is positioned below the beam to ensure the stability and safety of the machine. Additional 10mm steel plates (3) are laid within 2 meters of the outriggers to be erected by the subsequent small crane (5). These outriggers must be positioned above the beams. Four No. 20 I-beams (4) are laid beneath the plates, spaced 500mm apart.

[0018] The third step is to place the large and medium-sized mechanical lifting crane 1, which is a 200t crawler crane of Zoomlion ZCC2000-1, on the road surface after the steel plates 3 and I-beams 4 are laid, and the small and medium-sized mechanical lifting crane 5, which is a 25t truck crane (with a deadweight of 32t) of Zoomlion QY25VF, is transported to the roof.

[0019] The fourth step is to dismantle the super-large span tower crane by a small crane and place it in a 7.5m wide mechanical driving channel. The dismantled tower crane parts will be transferred to the radius of the tower crane next to the factory building by a truck, and the tower crane parts will be lifted by the side tower to the designated stacking site on the ground.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for dismantling a super-large span internal tower crane, characterized in that: The method is to move the large crane (1) Move to the side of the building where the tower crane is to be dismantled, transport the small crane (5) to the roof of the building by the large crane (1), and lay a mechanical driving channel on the top floor of the building through the steel plate (3). The small crane (5) is ready to erect the support legs and lay the steel plate (3) within 2 meters. I-beams (4) are laid under the laid steel plate (3). When dismantling a tower crane with an extra-large span, first dismantle the tower crane at the upper end of the building by the small crane (5). The dismantled tower crane structure is then transported to the building side tower crane transportation radius by a truck traveling on the mechanical driving channel, and the tower crane components are hoisted by the side tower to the designated stacking site on the ground; In the building below the mechanical travel passage paved with steel plates (3), an internal frame support system (2) is set up between the floor slabs to strengthen the support of the mechanical travel passage; the internal frame support system (2) is set up by 60 series buckle scaffolding; wherein the roof panel thickness is 120mm, the spacing of the bottom frame of the panel is: 1.8×1.8m, and the standard step distance is 1.5m; Secondary keel: 50×90mm wood @180mm; Main keel: 50×100×3.0mm square steel @1800mm; beam bottom frame spacing: 0.6m+0.9m+0.6m horizontally, 1.5m vertically; Secondary purlin: 50×90mm square timber, 6 pieces laid; distribution purlin: 50×50×2.5mm square steel @300mm; main purlin: 4 50×100×3.0mm square steel pipes; supporting beam: 2 10# channel steels; secondary purlin on beam side: 50×90mm square timber @200mm; main purlin on beam side: double 48.3×3.0 steel pipes, spacing 500mm; beam side tension screws: φ14mm, spacing: 500mm×500mm.

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