Technical information Crab range

When designing, erecting and dismantling, collective protection must be prioritized. When in certain circumstances erection guardrails providing collective protection cannot be fully or partially implemented, individual worker protection is ensured by a fall prevention system attached to the scaffolding (PPE page 22). MDS Guardrail (Montage Démontage Sécurité, Assembly Dismantling Safety) R e c o mm e n d a t i o n s 1 0 Ensure collective safety Before starting erection, always: • Check that the material is in good condition, • Reject any dubious items (twisted, crushed, with detached welds etc.), • Refuse all parts that are not supplied by Entrepose Échafaudages. Mixing parts from different origins on scaffolding is prohibited (see Article on mixed sourcing). Inspecting of the equipment Statics scaffolds should be interconnected and windbraced to support the vertical and wind loads to which they will be subject- ed. As the erection or dismantling progresses, the scaffolds should be firmly anchored to the building structure or any point with sufficient strength to ensure the stability even if a worker attached to the scaffold were to fall. Only specifically assigned, qualified erectors should have access to the scaffolds during erection, dismantling or modifications. Boards, beams, and prefabricated platforms used for decks must abut and the spans should be limited depending on their strength and the loads supported. Prevent the deck boards from tipping up. Ensure that the scaffold is strong and stable enough before installing hoists. Loads should be distributed as uniformly as possible and the deck should be kept clear of rubble. Contact our technicians for any further information. After erection or modification, the scaffold must be inspected. The inspection report must be displayed on the scaffold by the customer before it is used. Recommendations Before dismantling a scaffold, check the number and condition of the anchors and replace any that may have been removed. The scaffolding must always be brought back into compliance before it is dismantled. Earthing scaffolding The problem of earthing scaffolding regularly arises on sites, out of a concern for worker safety. OPPBTP has studied this issue and has concluded that earthing a built-up scaffold is not a recommended protection measure with regard to electrical hazards. In fact, it rather recommends: - evacuating the scaffolding during a storm, due to the risk of lightning, - using a highly sensitive differential circuit breaker (DDHS 30 mA) for the electrical devices used by the workers. Regulations governing guardrails The outer sides of scaffolding must be fitted with collective protection devices such that: "falls from heights are prevented by integrated guardrails or securely fixed and rigid guardrails with appropriate resistance, fixed at a height of between 1.00 m and 1.10 m, and having at least one toeboard measuring 10 to 15 cm, one handrail and one middle rail halfway up" (paragraph 2 of article R. 233-13-20 of the decree of 1st September 2004). There must be no gaps of more than 20 cm between the edge of the decks and the structure or equipment against which the scaffolding is erected. When the configuration of the structure or equipment prevents this maximum distance from being met, the risk of falling must be prevented by collective or individual protection devices under the same conditions as those for the outside. 01.11.17 T e c h n i c a l i n f o r m a t i o n