4D/5D BIM: Project Controlling for Excavation Support at the Bertoldshofen Tunnel

During construction of the approx. 600 m long Bertoldshofen road tunnel in the Allgäu, Bavaria, the mined tunnel including excavation and support measures was represented using the Building Information Modelling (BIM) method. The work concentrated on the production and linking of a continuous database structure in a defined BIM system environment. In addition to a model in accordance to the tender design, an as-built model was produced parallel to construction based on the digital tunnel documentation. The quantity-based calculation of time (4D) and costs (5D) in accordance with the guidelines in the contract at each stage of the project formed the basis for the monthly payment, performance of precise progress checks and the transparent representation of forecasts.

1 Introduction

In conventional tunnelling, the geology essentially determines the excavation method and support measures used as the tunnel advances. Since the exact ground stratification and geological behaviour are not completely known during the design phase, design and project execution in tunnelling demand flexible structures and tools.

If a design – and thus also a contractual structure – takes into considerations adaptations due to changed information basis, the project can be technically and economically optimised and later conflicts between the project parties can be avoided. Consistent...

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