Guided Auger boring in Granite Rock Fill and Bedrock up to 250 MPa
Within the Hong Kong Link Road (HKLR) project the Airport Express Link (AEL) rails had to be under crossed by two tunnels with multiple lanes. To avoid settlements it was decided to jack OD 813 mm steel pipes to create two pipe roofs before jacking the reinforced concrete frames. The challenge was to install these 44 steel pipes within a tolerance of +-70 mm in each direction at a maximum distance of 74 m in inhomogeneous granite rock fill and bedrock with UCS values of up to 250 MPa. The project was successfully completed in 2016.
Exhibitor: Bohrtec GmbH