Six installation methods for steel grids: Construction wisdom adapted to local conditions
2025-06-19
Rising Steel Structure
(1) High-altitude bulk method
Features: Grid members and nodes are assembled directly at the designed location without the need for large lifting equipment. Grids suitable for bolt-ball nodes have low site requirements, but the amount of high-altitude work is large, the construction efficiency is relatively low, and quality control is difficult.
Applicable scenarios: small grids, projects with complex shapes or limited sites.
Assembly sequence: Assemble from the middle to the surroundings and from bottom to top. First install the lower chord and lower chord ball, then install the web and upper chord to form a stable triangular unit, and then gradually unfold it.
(2) Strip or block installation method
Features: The grid is divided into several strips or blocks. After the ground assembly is completed, it is hoisted to the designed location for connection. It reduces the amount of high-altitude work and improves construction efficiency and safety, but it has certain requirements for hoisting equipment. The design of the split unit and the processing of the connection node are key.
Applicable scenarios: medium-span grids, the weight of the split unit is within the carrying capacity of the hoisting equipment. Assembly sequence: Assemble the strip or block units on the ground, check and hoist them into place, first connect the lower chord, then connect the web and upper chord, and ensure that the units are firmly connected.
(3) High-altitude sliding method
Features: Divide the grid into strips, slide them on the pre-set slide rails, and assemble and connect them after they are in place. No large-scale hoisting equipment is required during the construction process, and the floor space is small. It is suitable for narrow construction sites on site, but the installation accuracy and sliding synchronization of the slide rails are required to be high. Applicable scenarios: Narrow rectangular grids with long and narrow building planes. Assembly sequence: First, build an assembly platform at one end of the building, assemble the grid bar units on the platform, and then use the traction equipment to slide the units along the slide rails to the designed position, and then assemble and slide the subsequent units in turn, and finally complete the connection between the units.
(4) Overall hoisting method
Features: After the grid is assembled on the ground, it is hoisted into place at one time using large lifting equipment. This method has high construction efficiency and can effectively ensure the quality of grid installation, but it has extremely high requirements on the lifting capacity and lifting technology of the lifting equipment, and requires a large ground assembly site. Applicable scenarios: small and medium-sized grids, or large grids that can be assembled by lifting equipment. Assembly sequence: Complete all grid assembly work on the ground according to the design drawings, conduct a comprehensive inspection and acceptance of the grid, and after confirmation, use the lifting equipment to lift the grid as a whole to the designed position and fix it in place.
(5) Overall lifting method
Features: After the grid is assembled on the ground, the grid is lifted to the designed elevation using the lifting equipment installed on the top of the building column or other structure. No large lifting equipment is required, and the construction safety is relatively high, but the layout and synchronous control of the lifting equipment are technical difficulties. Applicable scenarios: grids with large spans and heavy weights, and projects where the surrounding environment is not convenient for the use of large lifting equipment. Assembly sequence: Complete the ground assembly of the grid, install the lifting equipment and lifting rigging, conduct a trial lift to check the stress of each component, and after confirmation, officially lift the grid to the designed elevation and complete the fixation.
(6) Overall lifting method
Features: Similar to the overall lifting method, the difference is that the lifting equipment is located below the grid, and the grid is gradually lifted to the designed position using jacks and other equipment. It is suitable for grids with fewer fulcrums and has high requirements for the bearing capacity of the foundation and lifting equipment. The synchronization and stability of the lifting must be strictly controlled during the construction process. Applicable scenarios: Grids with large spans and low heights, and projects with high requirements for the construction site. Assembly sequence: Assemble the grid on the ground, install the lifting equipment, conduct a trial lift, adjust the force of each lifting point to be uniform, and then gradually lift the grid to the designed elevation according to the predetermined procedure, and finally fix it.
