Study the preset and check calculation of bolted scaffolding
Scaffolding engineering design and erection parameters The project adopts fully enclosed double-row external landing scaffolding below the third floor of the project, and three-segment fully enclosed cantilever double-row external scaffolding for four or more floors. It is planned to set pre-embedded bolt-connected steel cantilever on the side of the beam from the fourth floor. And wire rope diagonally pulled structure. Cantilever steel, weld strength and pre-buried screw strength check calculation consider the actual situation of the construction. When the steel beam is installed in the project, in the case of meeting the strength grade of the upper concrete, when the three-step frame is set up, the wire rope is used in time. The upper pre-embedded lifting ring is firmly connected.
Therefore, in the three-step frame, only the steel cantilever force is considered. The bending distance is absorbed by the horizontal weld and the shear force is absorbed by the vertical weld. Pre-embeded bolt strength check the effective diameter of the pre-embedded bolt M20C4.8 at the thread d. The lower end of the pole is placed on the pile to prevent the pole from slipping; since the steel wire rope is to be pulled at the end of the I-beam overhang, The same steel bar is welded under the end of the I-beam as the pull-up point of the wire rope, and the pre-embedded bolt is subjected to a tensile force of N:=1.
When the steel pipe is fixed on the inner force bar, each node needs two right angles or rotating fasteners to work at the same time to meet the axial force design value requirements of the wall member. Precautions for the construction of the steel bar on the I-beam (l) All materials involved in the pre-embedded bolt-connected steel cantilever scaffolding must be qualified, and the steel pipe fasteners must be qualified before entering the site for inspection. (2) Under the premise of satisfying the concrete strength, after the scaffolding is erected to the three-step frame, the wire rope must be diagonally pulled with the overhanging steel and the lifting ring provided on the upper beam, and the wire rope joint is fastened by the rope clamp and the flower basket adjusting bolt. (3) 4 M20C4 fixed cantilever steel.
The 8-level bolt pre-buried position must be accurate and in place. The cantilevered steel beam shall be made according to the requirements of the schematic diagram. The welding material, the appearance quality of the weld and the size of the welding foot must meet the relevant requirements of the Technical Specification for Welding of Steel Structures in Construction. The steel pipe top support wall member must be connected to the scaffolding pole by two right angle fasteners or rotating fasteners.
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