AS 1657 pdf download

AS 1657 pdf download.Fixed platforms, walkways, stairways and ladders一Design, construction and installation
1.1 SCOPE
This Standard sets out requirements for the design, selection, construction and installation of fixed platforms, walkways, stairways and ladders that are intended to provide safe access to places used by operating, inspection, maintenance and servicing personnel. This Standard also applies to the following: (a) Movable platforms that are permanently configured but that may be site adjustable or site assembled/ modified. (b) Permanently installed roof access, where such access is for the purpose of installing, operating, inspecting, maintaining or servicing equipment that is located on，or is accessible from, the roof. (c) Permanently installed access for inspection and maintenance of the roof itself. NOTES: 1 In the absence of a directly applicable Standard, this Standard may be used for guidance in providing access to some parts of stationery and mobile machinery, light and te lecommunication towers, wind turbine towers and water and sewerage facilities. While such access may not be capable of conforming to all the requirements of this Standard, the principles and imposed actions should be followed. 2 Appendix A provides information on recommended component dimensions and materials for edge protection. 3 Appendix F provides a method for testing the load-carrying capacity of a twin-stile or single-stile fixed ladder. 4 Appendix G provides information on selection of stairways, walkways and fixed ladders. 5 Appendix H provides guidelines for fall protection measures for various types of ladders. 6 Appendix I provides design, fabrication and installation considerations for ladders to improve their safety and reduce the likelihood of injury to users. 7 Appendix J provides guidelines for roof access for the purposes of routine equipment or building maintenance activities.
1.4 DEFINITIONS
For the purposes of this Standard, the definitions below apply. 1.4.1 Access hatch A device normally closed, but which can be opened, to provide access through a platform, roof or other similar structure. NOTE: Also known as a trapdoor. 1.4.2 Fixed Permanently installed or configured structures used to gain access, including platforms from which work is performed. 1.4.3 Floor The surface of a platform, walkway or landing. 1.4.4 Going ， The horizontal distance from the nosing of one stair tread to the nosing of the next stair tread above or below. 1.4.5 Guardrail The highest rail in guardrailing fixed parallel to a floor or platform. 1.4.6 Guardrailing A system of rails or panels, or both, that provides edge protection at the edge of a floor or platform or walkway. 1.4.7 Handrail A rail that provides a handhold on a platform, walkway, stairway or step-type ladder. NOTE: A handrail may form part of a guardrail. 1.4.8 Headroom The minimum vertical distance, clear of all obstacles such as beams or ducts, above the floor or the slope line of the stair tread nosing. 1.4.9 Infill Typically a solid or mesh panel that prevents a person or material from falling through guardrailing. 1.4.10 Ladder 1.4.10.1 Rung -type ladder A structure comprising a stile or stiles and rungs on which a person may stand on or step on when ascending or descending. 1.4.10.2 Step-type ladder A structure comprising stiles and treads on which a person may stand on or step on when ascending or descending, and which also incorporates handrails. 1.4.11 Ladder cage A fixed enclosure that encircles the climbing space of a ladder. 1.4.12 Ladder flight The continuous part of a fixed ladder between- (a) top and bottom landings, in the case of ladders without intermediate landings; or (b) top or bottom landings and the nearest intermediate landing; or (c) successive intermediate landings. 1.4.13 Landing . An area at the top or bottom of a flight or between two flights. 1.4.14 Nosing The leading edge of a stair tread. 1.4.15 Pipe A hollow section made as a production item. NOTES: 1 Pipe may be round, oval, square or rectangular in section. 2 For the purposes of this Standard, the word ‘pipe’ is synonymous with ‘tube’ or ‘structural hollow section’. 1.4.16 Platform A designated surface to support a person working or resting, or materials used by persons. 1.4.17 Post A structural component, other than infill, that is used to support a handrail or guardrailing. NOTE: The terms ‘stanchion’ and rectangular support’ are synonymous with ‘post’ and are used for similar types of products by different industries.