What is the ratio of cantilever length to tail anchorage length of cantilever scaffold?

The length of the fixed end must exceed 1.25 times of the cantilever length, which can reduce the influence on the building structure, ensure the safety of the beam and improve the anchorage strength.

The cantilever horizontal steel beam adopts 16a channel steel, in which the length of the cantilever section outside the building is1.50m, and the length of the anchorage section inside the building is 2.00m. The cantilever horizontal steel beam is bound to the building with steel wire ropes, and the innermost steel wire rope is 1.20m away from the building.

Cantilever frame should be set horizontally on the beam, and the anchoring position must be set on the main beam or on the floor in the main beam. The anchorage point of cantilever beam and the node of cantilever frame must be welded or bolted. The connection between the support and the structure is generally embedded with round steel rings or U-bolts, which should meet the stress strength.

Extended data

Preparation before cantilever scaffold erection

(1) The design and manufacture of cantilever frame must comply with relevant national codes and standards.

(2) Before cantilever construction, a special construction plan should be prepared, with construction drawings and design calculations, which meet the safety technical requirements and complete the examination and approval procedures (preparation by the construction unit → examination and approval by the construction unit → examination and approval by the technical director of the construction unit → submission to the supervision unit → examination and approval by the chief supervision engineer → submission to the construction unit), and it will be implemented under the supervision of full-time safety management personnel.

(3) The support of the cantilever frame and the fixing method of the building structure are determined by design and calculation, and must be approved by the engineering design unit, mainly considering whether the building structure may be damaged.

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