engleski

Construction System for Secondary Tunnel Lining

This paper describes the performance of multifunctional precast elements used as secondary tunnel lining. After primary tunnel lining is placed, the elements forming a self-supporting arch are installed by using a special symmetrical scaffold. This scaffold enables the handling and placement of precast elements, which also serve as a self-supporting formwork for filling fresh concrete into the space between the elements and the primary tunnel lining. These precast elements would play a multiple role in tunnel construction and performance. Their special composite structure makes them fire and water-resistant. Their prefabricated nature keeps construction costs at an acceptable level ; in addition better quality of concrete is achieved in controllable factory conditions. The scaffold specifically intended for such construction enables continuous traffic even during the reconstruction of a tunnel, but, of course, with reasonable speed and traffic flow restrictions.

precast segments for secondary tunnel lining; scaffold; ventilation tubes; fire protection.

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