Tunnelling for E02 – Novobasin

Skills

Tunneling

Professional contract

Builder:

Kalundborg Forsyning
Kalundborg

Cooperation partners:

C.G. Jensen

Period:

2023-2023

80 m tunnel


In Kalundborg, we completed an 80 m long tunnel under Hovvejen. To avoid closing this heavily trafficked road, Kalundborg Forsyning in collaboration with Sweco opted for a tunnelling solution.

We constructed the 80 m tunnel using 1,600/1,960 mm diameter concrete pipes from IBF. The tunnelling was carried out from an 11 m deep sheet-piled press pit, with the tunnel depth varying between 3 and 11 m.


Precision tunnelling

The tunnel was drilled under the road with only 3 m of soil cover. This limited cover posed a risk of settlement and blow-ups, which could have compromised the road’s structural integrity. Therefore, precise control of our tunnelling equipment was critical to the project.

Throughout the tunnelling process, no blow-ups or ground movements in Hovvejen were detected. We also passed a 400 mm diameter concrete stormwater pipe, with only 32 cm clearance between the top of the tunnel machine and the underside of the stormwater pipe.

After tunnel completion, a TV inspection of the stormwater pipe was conducted, and no damage to the concrete pipeline was detected.