Integral hoisting for installation of large-span heavy-duty steel structures Zhao Zhongying, Song Wenzhen, Zang Ligang (Heilongjiang Provincial Installation Engineering Company, Harbin 150046, Heilongjiang). When hoisting is required, through-hole hydraulic jacks are used for hoisting, with significant results.
Stranded wire (1 bundle) 18 pieces each diameter 1I5. '. Leg i, steel stranded wire 1 Overview Heilongjiang Provincial Broadcasting and Television Center iconic building 200m2 ruby ​​studio and steel structure engineering of the bridge, the bridge structure is located in 2 main buildings In the middle, the total mass of the steel structure reaches 592. The hoisting is carried out (see). The ruby ​​section adopts overall hoisting. The length of the section is 52.94m, and the mass is 460t. After the installation at both ends is completed, 4 lifting brackets are made and installed (see Zi-Z in the figure). On the top of the bracket, each bracket is welded with a temporary rod ①and rod ②, and each rod is made of two 40-channel steel to control the stability of the bracket. Four through-type hydraulic jacks are placed on the cantilever ends of the four lifting brackets. Each jack is arranged with a bundle of steel through the center that is greater than the lifting height. The upper end of the steel strand is connected to the jack, and the lower end is connected to the steel structure to be hoisted through the lowering point. When the structure is hoisted, the steel strand in the jack is moved up along the center of the jack through computer control, hydraulic transmission, and mechanical action, and the steel structure is hoisted up to the docking position.
3 Precautions Temporary tie rods should be added between the two main beams at the lower part of the lifting point. See tie rod â‘£. The tie rods are made of two 40-channel steels, and the two channel steels are set on both sides of the beam respectively. The strength needs, without affecting the installation of the rod a and c when docking.
Lifting by this method has changed the stress of the original designed structure. Computer software should be used to verify the strength of each member of the overall structure.
The rod d is under high pressure, and its H-section steel should be strengthened into a box structure, and the strength of the eccentric compression should be checked.
In order to facilitate the docking, the welding of the upper and lower lifting points and the beam should be away from the edge of the counterpart 10, and the beam where the upper lifting point is seated, the cantilever section of the beam should be provided with a flexural support. Design, manufacture and strength check. The welds at both ends of the tie rod â‘¡ should be checked for strength.
After all the connection ports are fully connected, the force of the hydraulic jack can be relaxed, and then the temporary reinforcement rod can be removed.
The biggest advantage of using a through-hole hydraulic jack to lift large-span heavy-duty steel structures is: multi-point lifting, smooth lifting at each point, and synchronization error> 1.5, suitable for large-scale cranes and other lifting methods that cannot be completed High and large structure hoisting.
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