COMMON PROBLEMS OF SCAFFOLDING

Design

The heavy-duty scaffolding should have a clear understanding of the general if the slab thickness exceeds 300mm, it should be changed to consider the design in accordance with heavy-duty scaffolding, scaffolding load more than 15KN/ square meters, the design should organize experts. To distinguish those parts of the tube length changes greater impact on the load, support for the template should be considered: the top of the center line of a horizontal bar from the template support point length a should not be too long, generally less than 400mm suitable (in the new specification may be revised in), the general calculation pole top step and the bottom step of the maximum force should be calculated as the main point. When the load carrying capacity is dissatisfied, the pole should be increased to reduce the vertical and horizontal spacing, or increase the horizontal bar to reduce the step distance.

The domestic common scaffolding steel pipe, fastener, jacking and bottom material quality, the actual construction of the theoretical calculation without considering these, the best calculated safety factor in the process of design.

construction

Sweeping bar missing, and junction is not connected, sweeping shot from the distance is too large or too small; scaffold cracking, the thickness is not enough, did not meet the specifications overlap; template after removal of the inner vertical rod and the wall between the anti falling net; scissors in the plane is not continuous; the opening of scaffolding without cable brace; scaffold under small bar spacing is too large; the wall did not do outside the rigid connection; protective railing spacing is greater than 600mm; the fastener connection is not tight, slide fastener.

Deformation accident

Local deformation of scaffold due to foundation settlement. The character set closure or scissors in the double frame transverse section, a row of pole set up a group until the deformation outside the row. Eight closure or scissors must be located in a solid and reliable foundation.

Scaffolding upon which the rooting of the cantilever beam deflection exceeds the specified value, deal with the cantilever beam after anchorage reinforcement, steel support beams above the U shape holder is screwed down against the roof. There is gap between the steel beam and the reinforced ring, and it is required to be prepared with a wedge. The rope hanging beam is inspected one by one, all the fastening, ensure the uniform stress.

Scaffolding unloading, then pull system local damage, according to the original plan to immediately make the unload method to restore it, and to correct the deformation of parts and has produced bar. If the correct scaffolding outside the deformation of sheets, according to each bay set up a 5T chain, and the structure of tension, loosen the rigid pull contacts, each point inward and tighten down the chain to deformation is corrected, do rigid pull access and the unloading point of wire rope tightening, the stress is uniform, the go down the chain.