Nemetschek Engineering User Contest 2009 • Category 7: CAD Engineering, Engineering work and special structures 251 7 soon became obvious that in the implementation phase drawing had to be done in 3D. 3D-Modelling has several advantages: • A more insightful design is rendered, since the designer can clearly visualize what the design will look like “in reality”. Consequently, bottlenecks within the design can be traced and solved much earlier. • Sections and views can be generated quickly and accurately at random places. • Since an indirect interface continues to exist between the created views / sections and the 3D-model, changes can quite easily be carried out correctly anywhere. • By reinforcing in 3D the risk of errors can be reduced here as well. From the 3D-reinforcement model reinforcement drawings can be generated easily and quickly, if required including reinforcing bar bending schedules. The plan drawings were imported to model of the pumping station. In this way the drawings could be used to create the 3D volumes. In this project we mainly worked with ‘3D-Modelling’, because it consists of complex concrete forms. Since we were working in the detail engineering phase, the number of modifications were limited to applying and/or adjusting recesses, and further working details. Building components First of all a 3D-overview was made of the entire design. The entire design was subdivided into building components, and each building component was given a name. In the 3D-overview it can easily be seen where each component is located in the overall picture. Each building component is rendered by means of an isometric view. During implementation this has frequently turned out to be very illustrating. As soon as the model was finished, the (concrete) quantities could be presented by means of the ‘List Generator’. Each building component is automatically listed with the correct name, isometric reproduction and concrete quantity. Shell After the entire model had been finalized, views, sections and further working details were generated. Today Allplan BIM 2008 has a host of solutions to render views and sections. In the case of the Katwijk pumping station, we employed the ‘Shell’ method. One project staff member was appointed for the model as Model Administrator, who carried out modifications to the model. In this way operations could proceed smoothly. By working with several formwork models, more staff could work on the project simultaneously. In addition, clear agreements were made with regard to the file set structure. The current ‘Building Structure’ would have been an even more perfect method, but this only became available in the Allplan BIM 2008. Delivery of drawings In addition to the standard delivery of hard copy drawings, the contractor requested digital files such as *.pdf and *.dwg. The conversion of drawings into the requested files was simple, without data loss. Besides delivering standard form- and reinforcement drawings, as the contractor is used to, Allplan has made it possible to deliver a 3D-PDF, which creates a finer visual image of the ultimate design and its feasibility. www.grootingemalen.nl www.tauw.com Extension and renovation ‘Katwijk pumping station’
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