Nemetschek Engineering User Contest 2009 • Category 7: CAD Engineering, Engineering work and special structures 271 7 the slab with sufficient strength and durability to withstand all possible loads during its lifetime of 100 years. To assure optimal interaction, each reinforcement cage laps with its ‘neighbour’. As a result of the construction method, it is important to provide room for several construction tolerances. The cages are installed on top of a steel frame, supported by sheet pile walls and tension piles. However this frame can be installed quite accurately, deviations such as the exact pile location (x,y), position of the reinforcement elements (x,y,z), excavation level (z) and concrete cover (z) must be taken into account. Regarding the tolerances and the necessary interaction, all reinforcement elements must fit like a puzzle. In co-operation with the contractor (Heijmans-Boskalis), it is decided to use Allplan for both cage design, prefabricated production and to arrange the exact construction sequence. The manufacturer of the reinforcement cages is using the digital Allplan model as well. By the end of 2008, three compartments, each 75 metres long, were successfully built. In 2009 another three compartments will be constructed. Use of Allplan Engineering The tunnel is located in the western part of the Netherlands. The landscape consists of several polders, about 4 metres below sea level. The tunnel crosses the drainage and shipping canal (Ringvaart) of the Haarlemmermeerpolder, which has a water level almost equal to sea level. Also, the tunnel connects the Haarlemmermeerpolder with an adjacent polder. Because of these important preconditions the tunnel acts as a water barrier during its lifetime and also during construction. To ensure its water-retaining function, the design of the tunnel has to be checked for all types of contingencies, especially during construction. By designing the tunnel in Allplan 3D, it was relatively easy to find all possible leaks and adjustments of the design could be applied efficiently. All tunnelsections, 57 in total, the service buildings and the drainage sumps are added to the model. Also the 3D model of the roadworks is inserted in the Allplan model in order to check all interfaces with difficult roadcrossings (curved both horizontally and vertically). Finally, the reinforcement is added to the model and the construction-drawings are extracted. The digital model is also used by the reinforcement manufacturer for direct production of the reinforcement. As a result, mistakes by information transfer are being minimised. Summary • Total tunnel length: 1415 m • Covered section: 800 m • Open cut: 625 m • Internal width: 20 m (2 x 9 + 1 x 1.35 service and safety gallery) • Internal height: 6,1 m • Number of drawings: 200 (general arrangement), 200 (reinforcement) Tunnel ‘Ringvaart’
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