Martignano S.S. 47 Valsugana National Road

  • Section: Ponte Alto – Trento Nord (Martignano Alternate Route)
  • Client: Provincia Autonoma di Trento
  • Contract amount: € 111,220,567

The project involves the construction of an alternate route to the existing S.S. 47 through a twin-tube tunnel, with each tube measuring 2,750 m, exacavated by TBM. The liner is made of precast reinforced concrete segments measuring 1.50 m in length and 40 cm in thickness. In addition, the project consists in the construction of 305 m tunnel underneath Martignano, using the traditional sequential excavation method.

In addition to the tunnel under the hamlet of Martignano, the project also involves the construction of a tunnel measuring 305 m in length and built using traditional excavation methods, vehicle by-passes and other minor completion works.

The TBM used, known as “Tecla”, is a machine designed to excavate rocky soil characterised by great strength and hardness.

It has an excavation diameter of 12.05 m, a total length of 130 m and approximately 5 MW of installed power. It is able to dig and line an average of 16 ml of tunnel per day.

Tecla TBM numbers:

  • Excavation diameter: 12,05 m
  • Total Length: 130 m
  • Cross section area: 60 mq
  • Total weight: 370 t
  • Total installed power: 5 MW