090

FIGURE 27.50 Lintel reinforcement.

foundation structures should also be within ±6.0 cm of the design location [2,4,8]. Tolerances for the reinforcement are discussed in Section 27.7.

Formwork and scaffolding systems are generally proprietary and are provided by the constructor. Nevertheless, their influence on the shell quality is of utmost importance and diligent attention of the engineer is required. In general, the system should be designed to provide safety to operating personnel and to produce a sound structure. The working platforms should be designed for realistic loading and scaffolding systems used for continuous material transport should be designed and built taking into account the resulting loads.

Circumferential cross-section

^ <20 cm ^ <20 cm ^ In all shell areas | <20 cm | <20 cm |

^ <20 cm ^ <20 cm ^ In all shell areas | <20 cm | <20 cm |

Meridional cross-section I >3 cm

Meridional cross-section I >3 cm

FIGURE 27.51 Important minimum construction values.

FIGURE 27.51 Important minimum construction values.

The connections and joints between individual scaffolding units should be designed and built to act independently in case of collapse, so that the loss of one unit would not affect the adjacent units. Furthermore, at least two independent safety devices should be in place to prevent collapse of the scaffolding.

The shell wall should be designed to resist the anchor loads of the scaffolding, based on the actual strength of the concrete that is expected to be available when the anchors are loaded. Continuous monitoring of the concrete strength during the climbing process is essential.

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