Vsl International Ag

Peter Marti

Erwin Siegfried

The prestressed concrete lining has several reinforcement elements (32) distributed around the circumference and along the length of the pressure tunnel. There are prestressing elements (38, 39, 40, 41) which encompass at least a part of the circumference of the pressure tunnel. A bottom part (35) is disposed within the pressure tunnel, formed of several elongated anchorage bodies (15) in series. Each of the anchorage bodies (15) has an essentially U-shaped cross section. In each of the arms (2, 3) of the anchorage bodies turned towards the inside of the tunnel there are first means (5) for passing through at least one of each of the prestressing elements (38, 39, 40, 41). An bearing plate (8) is disposed on each of the facing inner surfaces of the arms in the region of each of the first pass-through means (5). Second means (10) for passing through at least one of each of the prestressing elements (38, 39, 40, 41) are foreseen in the base arm of the anchorage body 15. Each of the prestressing elements (38, 39, 40, 41) is, starting from a dead end anchor (43, 44), led through one of the second pass-through means (10) of one of the anchorage bodies (15) and, after crossing through one of the first pass-through means (5) of one of the anchorage bodies, ends in an anchor head of a stressing anchorage (42) bordering on one of the bearing plates (8). By use of the anchorage bodies a prestressed concrete lining can be simplified with respect to the state of the art. In particular, it guarantees speedy advancement in the progress of the construction. The construction time is therefore reduced.

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Belp, Switzerland

Peter Marti