The program RTwalls helps us to produce a technically realizable and at the same time efficient solution for our client.
Melanie Löcker und Rainer Massat
Technically feasible and still as efficient as possible: the demands of structural planners are ever increasing in the current climate. Dr. Hug Geoconsult from Oberursel, responsible for the foundation engineering tasks for the Frankfurt WESTEND WINDOWS, relies on IT systems that are proven in the construction industry.
The new WESTEND WINDOWS development in Frankfurt am Main on the Bockenheimer Landstraße 33 site was already largely occupied. The client, Projektgesellschaft Bockenheimer Landstraße 33-35 GmbH & Co. KG, represented by FGI Frankfurter Gewerbeimmobilien GmbH and IMBW Capital & Consulting GmbH, Stuttgart, commissioned construction of the new commercial property with 7 + 1 stories in downtown Frankfurt. The start of works: November 2006. The comprehensive planning measures already started earlier: In May 2006, Dr. Hug Geoconsult from Oberursel and their project partners, the architects from the office of Jo. Franzke in Frankfurt and the structural planners from Ruffert & Partner from Limburg, mid-Hesse were required to prepare everything required for successful implementation under the supervision of the project management office, WPV Baubetreuung GmbH, Frankfurt.
Before the new building could be erected, a 13-story building at Bockenheimer Landstraße 33 and a 5-story residential building at Straße Niedenau 65 had to be torn down. The demolition works, excavation shoring and resulting comprehensive approval processes involving all partners were a particular challenge for the Oberursel engineers.
“It was our task to dismantle the multi-story structure with basement,” says foundation specialist Rainer Massat of Dr. Hug. “Additionally, there was the direct proximity to the Bockenheimer Landstraße, which with the main Telekom line in the sidewalk area and various drains in the street and the subway train lines that run there, set particularly complex limiting conditions,” he continues. After all, it was here that the engineers had to plan a 1,650 square meter, nine meter deep excavation.
Thus, the engineers shored up the excavation against the Straße Niedenau und Bockenheimer Landstraße with an overcut and simply anchored bored pile wall. For the areas directly neighboring other buildings, HDI underpinning elements were used, also partially simply anchored.
“The foundation works themselves were anything but easy. But we also had to invest the same amount of time in the communication process,” the specialist engineer acknowledges. Because after the subsoil investigation, the office first had to create a geo-technical assessment. After this came the documents for building application approval, while approval for the statics of the excavation shoring had to be obtained. A number of environmental questions had to be explained before the calculations made by the engineers from Oberursel could be performed in the construction site.