PeBeKa constructed the Har-Gilo road tunnel with the length of 912 m, along the road from Jerusalem to Bethlehem. The tunnel was bored in limestone and dolomite rock coming from the Upper Cretaceous period and belonging to the Amminadav and Moza formations, separated by a transition zone.
Har Gilo Long Tunnel - Israel
Investor: Rotem Development Ltd
Time of project execution: 1993 - 1995
Additional technical data:
- Length of the tunnel: 912 m
- Diameter: 3 m
- Cross section of the tunnel: 70 m2
- Applied technology: the NATM method. The final support was made of sprayed concrete with steel fibres
Location
Izrael,
Dystrykt Judei i Samarii, k. Har Gilo
Project outline
PeBeKa S.A. built the Har-Gilo tunnel with the length of 912 metres, located under Mount Gilo in the southern part of Jerusalem. It is a fragment of the city's ring road allowing drivers to avoid the congested centre of Tel Aviv. PeBeKa engineers decided that the best solution would be to apply two different boring technologies: from the southern direction, the rock mass was mined mechanically by means of light hydraulic hammers, while from the northern direction, the tunnel was bored by means of the blasting method. The boring operation from the southern direction was carried out in two strata; first the upper stratum was made, while the lower stratum was made after the tunnel was cut through. The final support consists of sprayed concrete with the thickness of 15-20 cm, with steel fibres.
The construction of this tunnel with the length of close to one kilometre was the company's first contract obtained without the agency of any foreign trade entity.
Greatest challenges
- Using two different boring technologies and explosives
- Performing works along the route between the two popular cities: Jerusalem and Bethlehem
Key moment
Joining the two parts of the tunnel bored by means of different methods.
