A method for installing steel structures of large-scale factory buildings with multi-layer platforms

Abstract

The present invention provides a method for installing a steel structure for an expanded factory building containing a multi-layer platform. The method comprises the following steps: near a renovation or expansion area where the factory roof structure is closed, a tower crane that meets the lifting performance requirements of the steel structure components in the renovation or expansion area is set up to complete the demolition and new lifting of the steel structure components in the renovation or expansion area. For individual components that exceed the lifting load of the tower crane, a temporary lifting device is set up and two winches are used to lift them into place. The roof structure involved in the balance arm area that hinders the descent of the tower crane is temporarily supported and its cantilevered structure is stabilized. The obstructing structure is then reserved for installation. After the tower crane is lowered below the roof structure elevation, the reserved steel structure components are put into place to complete the installation of the steel structure components in the renovation or expansion area. The vertical lifting of the steel structure components of the factory building in the renovation or expansion area is achieved, the difficulty of putting large steel structure components into place after the factory roof structure is closed is reduced, and the progress of the project construction is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure factory building installation, and in particular to a method for installing a large steel structure of an expanded factory building containing multi-layer platforms. Background Art

[0002] According to the requirements of the national steel industry layout adjustment policy, in principle, no new steel joint ventures, independent iron and steel mills will be built separately, and the construction of independent rolling mills is not encouraged. It is necessary to rely on existing enterprises with conditions, combine mergers and relocations, and carry out transformation and expansion in areas with comparative advantages in water resources, raw materials, transportation, market consumption, etc., implement production cuts and relocations to meet the requirements of environmental protection and resource conservation.

[0003] In a large metallurgical production workshop with high and low spans and an overall layout, when partial renovation or expansion is carried out, except for the area to be renovated or expanded, the rest of the factory buildings generally cannot affect the normal production of other production lines. When a large-scale metallurgical plant is newly constructed, large-scale mobile lifting equipment is usually used for the construction of the plant steel structure because the plant steel structure components are heavy and have long specifications. The equipment is set inside or outside the span of the plant structure to complete the lifting of the steel structure components section by section and layer by layer. In the renovation or expansion project, since it is a local construction of the plant structure and the overall structure and roof of the plant are closed, the steel structure of the plant in the renovation or expansion area is designed as a multi-layer platform structure due to the configuration requirements of the production equipment installed after the renovation or expansion. The lifting of steel structure components has the characteristics of many installation points and a large installation area. Large-scale mobile lifting equipment cannot meet the lifting needs of the steel structure components in the renovation or expansion area without demolishing a large area of the roof structure, making the vertical lifting of steel structure components in the renovation or expansion project difficult, which restricts the progress of the project construction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to propose a method for installing the steel structure of a large-scale expanded factory building with multi-layer platforms, so as to realize the vertical lifting of the steel structure components of the factory building in the renovation or expansion area, reduce the difficulty of putting the large steel structure components into place after the factory building roof structure is closed, and ensure the progress of the project construction.

[0005] To achieve the above purpose, a method for installing the steel structure of a large-scale expanded factory building with multi-layer platforms is provided, which is to set up a tower crane with lifting performance that meets the requirements of the steel structure components in the renovation or expansion area near the renovation or expansion area where the factory roof structure is closed, so as to complete the demolition and new lifting of the steel structure components in the renovation or expansion area. For individual components that exceed the lifting load of the tower crane, a temporary lifting device is set up and two winches are used to lift them in opposite directions to complete their positioning. The roof structure involved in the balance arm area that hinders the descent of the tower crane is temporarily supported and its cantilevered structure is stabilized. The obstructing structure is reserved for installation. After the tower crane is lowered below the roof structure elevation, the reserved steel structure components are put into place to complete the installation of the steel structure components in the renovation or expansion area. This method not only realizes the rapid positioning of the steel structure components in the renovation or expansion area, but also minimizes the workload of demolishing and subsequently restoring the closed factory roof structure, thereby ensuring the construction speed of the renovation or expansion project and reducing the investment in construction costs. The steps are as follows:

[0006] Step 1: Installation of hoisting equipment and construction of modified or expanded steel structure components:

[0007] In accordance with the construction scope of the steel structure components of the factory building renovation or expansion, the tower crane body is installed in the hole opened on the steel structure roof of the low-rise factory building. Relying on the temporary bracket on the steel structure roof of the low-rise factory building, the equipment structure of the tower crane is assembled online on the steel structure roof of the low-rise factory building to complete the tower crane installation in the renovation or expansion steel structure area;

[0008] Use a tower crane to first complete the demolition of the steel structure components of the low-rise factory building in the renovation or expansion area, and then use the tower crane to hoist the steel structure components of the high-rise factory building layer by layer and section by section through the void space in the renovation or demolition area and the hoisting holes set on the steel structure of the low-rise factory building;

[0009] Step 2: Put the super heavy components in place:

[0010] In the area of high-rise factory building steel structure renovation or expansion, if there are individual overweight steel beams, the method is to first install the high-rise factory building columns above the overweight steel beams on both sides, then set up temporary lifting steel beams between the high-rise factory building columns on both sides, and then set up two lifting winches at the diagonal positions of the platform below the space where the overweight steel beams are to be placed;

[0011] The overweight steel beam is hoisted and installed in place by the combined action of the hoisting winch, temporary hoisting steel beam, hoisting pulley block and hoisting wire rope;

[0012] After the overweight steel beams are in place, the temporary lifting steel beams are promptly removed and the tower crane is used to continue lifting other high-rise factory building steel structure components;

[0013] Step 3: Reservation of partial roof beams of high-rise factory building steel structure:

[0014] The installation of roof beams of high-rise factory buildings adopts the closed construction of high-rise factory building steel structure from the left to the right of the renovation or expansion area;

[0015] The parts of the high-rise factory building roof beam that need to be partially reserved are: when the tower crane's balance arm is perpendicular to the position just above the high-rise factory building steel structure, the tower crane's balance arm is horizontally projected onto the high-rise factory building roof beam below, and the part of the high-rise factory building roof beam where its projection intersects with the high-rise factory building roof beam is the reserved component that will not be installed first, and a temporary column is erected on the right side of its cantilevered part to provide stable support for the cantilevered structure that is subsequently connected to the reserved high-rise factory building roof beam. At the same time, a short column is vertically set at each of the two adjacent ends of the high-rise factory building roof beam that has been in place on both sides of the reserved high-rise factory building roof beam, and the upper end of the short column is provided with a lifting lug;

[0016] Step 4: Reserve the roof beams of high-rise factory buildings in place:

[0017] When all components in the high-altitude area of the steel structure of the renovated or expanded high-rise factory building have been hoisted, the tower crane will be lowered to below the elevation of the high-rise factory building roof beam. A hoisting winch will be set up at the diagonal position of the platform below the space reserved for the high-rise factory building roof beam to be placed. The hoisting winch, short column, hoisting pulley block and wire rope will be used to complete the work of lifting the reserved high-rise factory building roof beam into place.

[0018] Then remove the temporary columns erected on the right side of the cantilevered part of the high-rise factory building roof beam and the short columns set on the high-rise factory building roof beam;

[0019] After the tower crane is removed, the lifting holes previously opened in the steel structure of the low-rise factory building will be closed by directly lifting the steel structure components using a truck crane.

[0020] The present invention proposes a method for installing the steel structure of a large-scale expanded factory building with multi-layer platforms. The method is to set up a tower crane with lifting performance that meets the requirements of the steel structure components in the renovation or expansion area near the renovation or expansion area with a closed factory roof structure, so as to complete the demolition and new lifting of the steel structure components in the renovation or expansion area. For individual components that exceed the lifting load of the tower crane, a temporary device is set up and two winches are used to lift them into place. The roof structure involved in the balance arm area that hinders the descent of the tower crane is temporarily supported and its cantilevered structure part is stabilized. The obstructing structure is reserved for installation. After the tower crane is lowered below the roof structure elevation, the reserved steel structure components are put into place to complete the installation of the steel structure components in the renovation or expansion area. This method can achieve rapid placement of the steel structure components in the renovation or expansion area while minimizing the workload of demolition and subsequent restoration of the closed factory roof structure, thereby ensuring the construction speed of the renovation or expansion project and reducing the investment in project construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the layout of the tower crane and the high-rise and low-rise factory building steel structures in a method for installing a large-scale factory building steel structure with multi-layer platforms proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the steel structure construction of a high-rise factory building;

[0023] Figure 3 This is a schematic diagram of the placement of super-heavy steel beams;

[0024] Figure 4 It is a schematic diagram of the closed steel structure of a high-rise factory building;

[0025] Figure 5 This is a schematic diagram of the cantilever support reserved for the roof beam of a high-rise factory building;

[0026] Figure 6 This is a schematic diagram of a tower crane lowering to the lower roof by reserving the space for the roof beams of a high-rise factory building;

[0027] Figure 7 This is a schematic diagram of the reserved high-rise roof beams in place.

[0028] In the figure: 1. Low-rise factory building steel structure; 2. High-rise factory building steel structure; 3. Tower crane; 4. Hoisting holes; 5. Temporary support; 6. Overweight steel beam; 7. High-rise factory building columns; 8. Temporary hoisting steel beam; 9. Hoisting winch; 10. High-rise platform beam; 11. Temporary columns; 12. High-rise factory building roof beam; 13. Short columns; 14. Balance arm. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] A steel mill in Fujian Province expanded and renovated a set of 120t converters based on the original steel mill's two 120t converters. This involved the renovation of the steelworks' high-span steel structure and the construction of the expansion steel structure, totaling nearly 2,000t. The renovation and expansion area included the installation of a six-story equipment steel structure platform. The expanded plant building had a total height of 52m and a width of 24m. A large-scale expansion plant steel structure installation method with multi-layer platforms was adopted. Under the premise of sealing the high and low roofs of the original plant building, a large tower crane and winch were used to complete the vertical lifting of the steel structure components of the large expansion plant building. See the attached figure for details. The steps are as follows:

[0031] like Figure 1 、 Figure 2 As shown, the first step is the installation of hoisting equipment and the construction of modified or expanded steel structure components:

[0032] In accordance with the construction scope of the steel structure components for the factory building renovation or expansion, the tower body of the tower crane 3 is installed at the hole opened on the roof of the steel structure 1 of the low-rise factory building. With the help of the temporary bracket 5 on the roof of the steel structure 1 of the low-rise factory building, the equipment structure of the tower crane 3 is assembled online on the roof of the steel structure 1 of the low-rise factory building, thus completing the installation of the tower crane 3 in the area of the renovation or expansion of the steel structure.

[0033] The tower crane 3 is used to first complete the demolition of the steel structure 1 components of the low-rise factory building in the renovation or expansion area, and then the tower crane 3 is used to hoist the steel structure 2 components of the high-rise factory building layer by layer and section by section through the void space in the renovation or demolition area and the hoisting holes 4 provided on the low-rise factory building steel structure 1;

[0034] like Figure 3 As shown, the second step: super heavy components are in place:

[0035] In the area where the high-rise factory steel structure 2 is being renovated or expanded, if some overweight steel beams 6 appear, the high-rise factory columns 7 on both sides of the overweight steel beams 6 are first installed. Then, temporary lifting steel beams 8 are erected between the high-rise factory columns 7 on both sides. Finally, two lifting winches 9 are installed at the diagonal positions of the platform below the space where the overweight steel beams 6 are to be installed.

[0036] The overweight steel beam 6 is lifted and installed in place by the combined action of the hoisting winch 9, the temporary hoisting steel beam 8, the hoisting pulley block, and the hoisting wire rope;

[0037] After the overweight steel beam 6 is in place, the temporary hoisting steel beam 8 is promptly removed, and the tower crane 3 is used to continue the hoisting work of other high-rise factory building steel structure 2 components;

[0038] like Figure 4 、 Figure 5 As shown, the third step: reservation of partial roof beams of high-rise factory steel structure 2:

[0039] The installation of the high-rise factory building roof beams 12 is carried out by gradually carrying out the closed construction of the high-rise factory building steel structure 2 from the left side to the right side of the renovation or expansion area;

[0040] The part of the high-rise factory building roof beam 12 that needs to be partially reserved is: when the balance arm 14 of the tower crane 3 is orthogonal to the position just above the high-rise factory building steel structure 2, the balance arm 14 of the tower crane 3 is horizontally projected onto the high-rise factory building roof beam 12 below, and the part of the high-rise factory building roof beam 12 where its projection intersects with the high-rise factory building roof beam 12 is the reserved component that will not be installed first, and a temporary column 11 is erected on the right side of its cantilevered part to provide a stable support for the cantilevered structure that is subsequently connected to the reserved high-rise factory building roof beam 12. At the same time, a short column 13 is vertically arranged at each of the two adjacent ends of the high-rise factory building roof beam 12 that has been in place on both sides of the reserved high-rise factory building roof beam 12, and the upper end of the short column 13 is provided with a lifting lug;

[0041] like Figure 6 、 Figure 7 As shown, the fourth step: reserve the high-rise factory building deck beam 12 in place:

[0042] When all components of the high-altitude area of the steel structure 2 of the renovated or expanded high-rise factory building have been hoisted, the tower crane 3 is lowered to below the elevation of the high-rise factory building roof beam 12. A hoisting winch 9 is set at the diagonal position of the platform below the space reserved for the high-rise factory building roof beam 12 to be placed. The hoisting winch 9, short column 13, hoisting pulley block and wire rope are used to complete the lifting and placement of the reserved high-rise factory building roof beam 12.

[0043] Then remove the temporary column 11 set up on the right side of the cantilevered part of the high-rise factory building deck beam 12 and the short column 13 set on the high-rise factory building deck beam 12;

[0044] After the tower crane 3 is dismantled, the hoisting holes 4 previously opened in the steel structure 1 of the low-rise factory building are closed by directly hoisting the steel structure components using a truck crane.

[0045] As a further improvement of the present invention, the temporary hoisting steel beams 8, temporary columns 11 and short columns 13 are all made of steel sections that meet the structural stress requirements in combination with the stress calculation at the construction site.

Claims

1. A method for installing a steel structure of a large-scale expansion plant with multi-layer platforms, characterized in that: The following steps are involved: Step 1: Installation of hoisting equipment and construction of modified or expanded steel structure components: In combination with the construction scope of the steel structure components of the factory building renovation or expansion, the tower body of the tower crane (3) is installed at the hole opened on the roof of the steel structure (1) of the low-rise factory building, and the equipment structure of the tower crane (3) is assembled online on the roof of the steel structure (1) of the low-rise factory building by relying on the temporary bracket (5) on the roof of the steel structure (1) of the low-rise factory building, thereby completing the installation of the tower crane (3) in the renovation or expansion steel structure area; The tower crane (3) is used to first complete the demolition work of the components of the low-rise factory building steel structure (1) in the renovation or expansion area, and then the tower crane (3) is used to perform the hoisting work of the components of the high-rise factory building steel structure (2) layer by layer and section by section through the void space in the renovation or demolition area and the hoisting holes (4) provided on the low-rise factory building steel structure (1); Step 2: Put the super heavy components in place: In the area where the high-rise factory steel structure (2) is being renovated or expanded, if there are individual overweight steel beams (6), the method is to first install the high-rise factory columns (7) above both sides of the overweight steel beams (6), then set up temporary hoisting steel beams (8) between the high-rise factory columns (7) on both sides, and then set up two hoisting winches (9) at the diagonal positions of the platform below the space where the overweight steel beams (6) are to be placed; The overweight steel beam (6) is lifted by the lifting winch (9), the temporary lifting steel beam (8), the lifting pulley block, and the lifting wire rope to complete the lifting and installation work; After the overweight steel beam (6) is in place, the temporary hoisting steel beam (8) is promptly removed, and the tower crane (3) is continued to be used to carry out the hoisting work of other high-rise factory building steel structure (2) components; Step 3: Partial roof beam reservation for high-rise factory steel structure (2): The installation of the high-rise factory building roof beam (12) is carried out by gradually carrying out the closed construction of the high-rise factory building steel structure (2) from the left side to the right side of the renovation or expansion area; The part of the high-rise factory building roof beam (12) that needs to be partially reserved is: when the balance arm (14) of the tower crane (3) is orthogonal to the position just above the high-rise factory building steel structure (2), the balance arm (14) of the tower crane (3) is horizontally projected onto the high-rise factory building roof beam (12) below, and the part of the high-rise factory building roof beam (12) where its projection intersects with the high-rise factory building roof beam (12) is the reserved component that is not installed first, and a temporary column (11) is set up on the right side of its cantilevered part to provide a stable support for the cantilevered structure that is subsequently connected to the reserved high-rise factory building roof beam (12). At the same time, a short column (13) is vertically arranged at the adjacent two ends of the high-rise factory building roof beam (12) that has been in place on both sides of the reserved high-rise factory building roof beam (12), and the upper end of the short column (13) is provided with a lifting lug; Step 4: Reserve the high-rise factory building deck beam (12) in place: After all components of the high-altitude area of the steel structure (2) of the renovated or expanded high-rise factory building have been hoisted, the tower crane (3) is lowered to below the elevation of the high-rise factory building roof beam (12), and a hoisting winch (9) is set at the diagonal position of the platform below the space reserved for the high-rise factory building roof beam (12) to be placed in place. The hoisting winch (9), short column (13), hoisting pulley block and steel wire rope are used to complete the lifting and placement work of the reserved high-rise factory building roof beam (12); Then, the temporary columns (11) erected on the right side of the cantilevered portion of the high-rise factory building deck beam (12) and the short columns (13) provided on the high-rise factory building deck beam (12) are removed; After the tower crane (3) is removed, the previously opened lifting holes (4) of the steel structure of the low-rise factory building (1) are closed by directly lifting the steel structure components using a truck crane; The temporary hoisting steel beam (8), temporary column (11) and short column (13) are all made of steel sections that meet the structural stress requirements in combination with the stress calculation at the construction site.

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