ACCESS STAIRCASES - TECHNICAL INFORMATION - 2023 160 5.3 Overhead clearance The minimum overhead clearance between work areas must be 1.90 m. 5.5 Lateral protection 5.5.1 General points The work and access areas must have a lateral protection comprising at least a main rail, a middle rail and a toe board. The staircases do not need a toe board. The lateral protection must be fixed in such a way that it cannot be accidentally dismantled. 5.5.2 Main rail The main rail of the guardrail must be fixed so that its upper side is always at least 1,000 mm above the work floor (absolute minimum height of 950 mm). 5.5.3 Intermediate lateral protection The intermediate lateral protection must be fixed between the main guardrail and the toe board. The openings in the lateral protection must be sized in such a way that a sphere with a diameter of 470 mm cannot pass through it. 5.5.4 Toe board A toe board must be fixed in such a way that its upper edge is at least 150 mm above the work floor. Any orifices and slits in a toe board, apart from lifting holes, must be smaller than 25 mm in one direction. 5.8 Access between levels 5.8.1 General points Safe and ergonomic means of access must be provided. The scaffolding system must have means of access between the different levels. This must be in the form of sloping ladders or staircases. They must open onto the deck, be located in a wider part of the service scaffolding at the end of a row or in a directly adjoining tower. Staircases and ladders must be fixed so as to prevent their being accidentally detached, and the steps must have a non-slip surface. 5.8.2. Staircases The combined values of step height u, and step run g, must match the following equation: 540 mm ≤ 2u + g ≤ 660 mm. - Rise: 175 mm ≤ u ≤ 225 mm - Overlap: - 25 mm ≤ a ≤ 5.5 mm - Angle of flight: 30° ≤ a ≤ 55° Minimum width clearance: 500 mm. Unit: mm 5.8.3. Access openings The dimensions of the passage for creating an access opening on a deck must be at least 0.45 m wide, measured width-wise on the deck and 0.60 m long. If the opening cannot be closed with a fixed trapdoor, it must be possible to install a lateral protection. It must be possible to hold the trapdoor closed. 6.2.4. Access approaches With the exception of class 1 work scaffolding, horizontal access approaches must be able to bear a class 2 working load. When part of an access approach is set aside for a particular task, it must be able to bear the appropriate working load. For staircases accessing service scaffolding, each tread and each landing must be designed to bear the greater of the following two loads: a) a single load of 1.5 kN in the least favourable position, considered evenly distributed over an area of 200 x 200 mm or the actual width if it is less than 200 mm; b) an evenly distributed load of 1 kN/m². The framework of staircases must be able to bear a load of 1 kN/m² evenly distributed over all the steps and landings up to a height of 10 m. 6.2.5 Loads applied to the lateral protection 6.2.5.1Downward load All guardrails (main and middle), irrespective of their supports, must be able to bear a concentrated load of 1.25 kN. This must be regarded as a shock load and must be applied downwards in the least favourable position up to a sector ±10° from the vertical. 6.2.5.2 Horizontal load All the components of the lateral protection, apart from the toe boards, must be designed to bear a concentrated horizontal load of 0.3 kN, again in the least favourable position. For toe boards, the concentrated horizontal load is 0.15 kN. 6.2.5.3 Upward load In order to check that all the components of the lateral protection are firmly secured, apart from the toe board, a concentrated load of 0.3 kN must be applied upwards vertically in the least favourable position. 6.3.2 Elastic sag of the lateral protection Each main or middle guardrail rail and each toe board, disregarding its span, must not sag by more than 35 mm, when subject to the horizontal load specified in 6.2.5.2. Class A Class B Depth of step 125 ≤ s < 165 s ≥ 165 Step run g 150 ≤ g ≤ 175 g ≥ 175 REGULATIONS / STANDARDS CONCERNING WORKSITE ACCESS SCAFFOLDING - PERFORMANCE AND DESIGN REQUIREMENTS, IN GENERAL NF EN 12811-1 - August 2004
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