The prefab steel workshop contains a welding workshop in zone A and B and a stamping workshop in zone C. The steel truss structure in Zone A and B is a steel column + steel truss structure with a length of 336 meters, a width of 216 meters, a truss span of 24 meters, and a column spacing of 6 meters.

The workshop in Zone C is a three-span portal steel frame structure with a length of 216 meters, a width of 90 meters, and a column spacing of 8 meters. The Span is 24m+36m+30m.

There are a total of 176 box columns with a maximum weight of 8.2 tons. The processing of Steel Box Column as follows:

The main truss has a total of 154 trusses. The single truss has a length of 24 meters and a height of 3.5 meters. The maximum ceiling height is about 14.1 meters, and the weight is about 12 tons. The main truss chords and web members are all H-shaped steel.

There are a total of 522 sub-truss. The single-truss has a length of 24 meters, a height of 4 meters, a maximum ceiling height of 14.1 meters, and a weight of about 7.5 tons. The chord and web members of the secondary truss are H-shaped steel.

The installation plan of Steel Truss Structure Workshop:

The steel structure building consists of two workshops, the welding workshop and the stamping workshop, which are divided into three zones, A, B, and C. Three areas can be constructed at the same time, saving construction time.

Construction sequence of Steel Truss Structure in A and B area:

The main process flow of site hoisting construction: steel column → main truss → secondary truss → roof bracing, purlin.

Construction sequence of the steel truss structure in Zone C:

The process of on-site hoisting: hoist steel column → install column bracing → hoist crane beam, and correction → roof beam → installation of roof bracing, and purlins.

The steel structure in Zone A and B is divided into two construction lines, starting from 1 axis and 15 axes. 4 sets of 25-ton trucks hoist the steel columns, and 4 sets of 45-ton trucks hoist the main roof truss due to its heavyweight. 4 sets of 30-ton truck cranes hoist the roof sub-truss, and the trusses are assembled on site. The roof trusses are assembled on-site with 4 sets of 10-ton truck cranes. After the trusses are assembled on the ground, they are directly hoisted in place by 45-ton and 30-ton truck cranes.

Analysis and selection of hoisting machinery in Steel Workshop A and B:

The maximum length of the steel column is about 16 meters, and the maximum weight is about 8.2 tons. A 25-ton truck crane is selected with a boom length of 24.2 meters, a hoisting radius of 8 meters, a height of 21 meters, and a lifting weight of 8.45 tons, which fully meets the lifting requirements.

The length of the roof’s main truss is 24 meters, the height is 3.5 meters, the maximum top elevation is about 14.1 meters, and the weight is about 12 tons. Choose a 45-ton truck crane with a boom length of 25.3 meters, a hoisting radius of 8 meters, a hoisting height of 24 meters, and a lifting weight of 14.8 tons, which fully meets the hoisting requirements.

The single sub-truss length is 24 meters, the height is 4 meters, the maximum ceiling height is about 14.1 meters, and the weight is about 7.5 tons. Choose a 30-ton truck with a boom of 24.4 meters and a hoisting radius of 8 meters. The hoisting height is 24 meters. The weight is 8.55 tons, which fully meets the lifting requirements.