What are the technical requirements for the installation of high-rise steel structures?

What are the technical requirements for the installation of high-rise steel structures? Zhong Da Consulting Company introduced the technical requirements of high-rise steel structure installation for your reference.

(1) Preparation work: including pre-inspection and matching of steel members, inspection of positioning axis and elevation and anchor bolts, on-site stacking of steel members, selection of installation machinery, division of installation flow section and determination of installation sequence, and entry of labor force, etc.

(2) Multi-storey and high-rise steel structures are hoisted by comprehensive hoisting method on the basis of zoning. Generally, the hoisting procedure is: the plane starts from the middle or symmetrical nodes, and the column network of one node is used as the hoisting unit, and the hoisting is carried out in the order of steel column → steel beam → support, and extends around. The vertical direction forms a stable structure from bottom to top, and the transverse members in the same column are usually installed layer by layer from top to bottom. Adopting symmetrical installation and symmetrical fixing technology is beneficial to reduce the accumulation of installation errors and welding deformation of joints.

In the installation process, the hoisting operation area is usually divided according to the hoisting procedure, and it is carried out simultaneously according to the divided areas and the same order. When an area is hoisted, measurement, calibration and initial screwing of high-strength bolts will be carried out. After several areas are installed, the whole structure will be measured, corrected, and finally tightened and welded. Then, proceed to the next section of steel column hoisting.

(3) The steel columns of high-rise buildings are usually divided into 2 ~ 4 floors, and a little hoisting is generally adopted. Only after the steel column is installed in place, aligned with the axis, corrected for verticality and temporarily fixed firmly can the hook be loosened.

During installation, the positioning axis of each steel column should be led directly from the ground control axis, not from the axis of the lower column. After the installation, welding and bolting of all components within each column are completed and qualified, the positioning axis of the previous column can be measured from the ground control axis.

(4) Steel beams with the same column section and the same span shall be installed from top to bottom. After the installation of steel beams, it is recommended to install profiled steel plates on the stairs and floors within the scope of this section immediately.

(5) When installing the structure, attention should be paid to the changes caused by the thermal effects caused by temperature changes such as sunshine and welding on the expansion and bending of the components, and corresponding measures should be taken.

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