MULTICRAB - TECHNICAL INFORMATION - 2023 126 TECHNICAL DATA CALCULATIONS OF THE "FAÇADE" TYPE Class of the façade scaffolding according to NF EN 12810 and 12811 The MULTICRAB equipment is granted the right to use the NF "Worksite equipment" mark (NF096) for multidirectional and multilevel load-bearing structures having the following dimensions: Design assumptions The following calculations are performed with the method proposed in the scaffolding manual of the Syndicat Français de l'Échafaudage, du Coffrage et de l’Étaiement (SFECE). The assumptions in question are primarily those of the Eurocodes and, by default, those of standards NF EN 12810 and 12811. The following justifications are valid for known "standard" façade scaffolding with a maximum height of 24 m installed on a closed building (fullness of the building = 1). Special calculations are required for any other configuration. Our design offices are at your disposal to carry out any specific calculations. The calculation determines the vertical load in the upright bearing the greatest load and the forces in the anchor points for a configuration compliant with the standards. Comment on the justification of elements under working load The scaffolding can bear different loads according to their use. The load applies to working surfaces varies according to the class of the scaffolding (see chapter on scaffolding classes). This load is applied in its entirety to the working surface on the most unfavourable deck. When a service scaffolding has several levels, the whole working surface, cantilevered or supported by cantilevers, must be able to bear the same working load as the main deck (NF EN 12811-1 art. 6.2.2.5) 50% of this load must also be applied to the working surface directly above or below (NF EN 12811-1 art. 6.2.9.2). Principle for calculating the working load: A first deck level 100% loaded + A second deck level 50% loaded Comment on the justification of the forces in the wind Scaffolding is considered to be "upwind" or "downwind" according to its location with respect to the building and the direction of the wind. As the coefficient applied according to this orientation is different, it is therefore necessary to check the elements that ensure overall stability (anchors, anchor points) according to the most unfavourable case for each of them. Peak dynamic pressure calculated according to EN 1991-14 (Eurocode 1, part 4) Peak dynamic pressure is calculated using the formula: qp(Z) (daN/m2) = (1 + (7 x ) x 1/ 2 x 1,225 x (Vb 2 x C 0(Z) 2 x (0,19 x ( ) )2 x (In ) KI c0(Z) x ln ( ) Z z0 z0 z0,II 0,07 z z0 2 With Vb = Cdir. Cseason. Cprob. Vb,0 and Co(Z) = 1 Design assumptions: façade assembled in town with a maximum height of 24 m, against a closed building in Region 2. "Downwind" "Downwind” Scaffolding "Upwind” Scaffolding Wind "Downwind” Scaffolding "Upwind” Scaffolding Wind Wind Wind "Downwind" "Downwind" "Downwind" Map of wind zones National Annex of EN 1991-1-4 The anchor points are to be checked according to the bearing element and the technical information of the suppliers. Class of the model with steel decking NF EN 12810 and 12811 Width Max. framework Not Covered Covered 0.70 m 3.00 m Class 5 Class 5 0.70 m 2.50 m Class 6 Class 6 1.00 m 3.00 m Class 4 Class 5 1.00 m 2.50 m Class 5 Class 6 1.00 m 2.00 m Class 6 Class 6 Class of the model with mixed aluminium/wood decking NF EN 12810 and 12811 Width Max. framework Not Covered Covered 0.70 m 3.00 m Class 4 Class 4 0.70 m 2.50 m Class 5 Class 5 1.00 m 3.00 m Class 3 Class 3 1.00 m 2.50 m Class 4 Class 4 1.00 m 2.00 m Class 4 Class 4 Wind regions
RkJQdWJsaXNoZXIy OTQ2MzM=