MUNK - Access Solutions 2023 Page 393
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Representation of standing height and working height The choice of the right ladder/scaffolding always depends on the circumstances and the working height required. Formula * Standing height + 2.0 m = approx. working height * Depending on body size Calculation of the ladder length of straight ladders with known vertical height Required minimum ladder length (in m) at the following work angle 75° rung ladders (still permitted) 70° rung ladders (our recommendation) 70° stepladders 60° stairs 45° stairs vert. Height (in m) vert. H × F * 1.035 vert. H × F * 1.064 vert. H × F * 1.064 vert. H × F * 1.155 vert. H × F * 1.414 2.0 2.05 2.15 2.15 2.30 2.85 2.5 2.60 2.65 2.65 2.90 3.55 3.0 3.10 3.20 3.20 3.45 4.25 3.5 3.60 3.70 3.70 4.05 4.95 4.0 4.15 4.25 4.25 4.60 5.65 4.5 4.65 4.80 – 5.20 6.35 5.0 5.20 5.30 – 5.80 7.05 5.5 5.70 5.85 – 6.35 7.80 6.0 6.20 6.40 – 6.95 8.50 6.5 6.75 6.90 – 7.50 9.20 7.0 7.25 7.45 – 8.10 9.90 * Height x Factor X Elbow method The required minimum lengths can be read from the table. We always recommend selecting the next largest overall length from our delivery range. Refer to the information on page 392 if the straight ladder is also to be used for climbing onto objects. A straight ladder that is positioned too steeply can fall over. If it is too flat, it might slip away. Use the elbow method to select the correct inclination angle Example of how to calculate the minimum ladder length: Vertical height (upper contact point) = 6.0 m If a rung ladder is used: (70° inclination angle) 6.0 m x 1.064 = 6.4 m If the straight ladder is used for bridging onto roof surfaces, the required minimum additional length of 1.0 m must also be taken into account The values are rounded to 5 cm 393
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