Abstract:

In the construction of Chegongmiao Station of 11301 bid section of Line 11 of Shenzhen Metro, shaped steel columns need to be installed rapidly and accurately into highstrength rocks (with 120 MPa uniaxial compressive strength) The following two key technologies are adopted to fulfill the difficult job: 1) Advanced coretaking drilling rig is used and special core taking process is adopted so that large diameter (with 20 m diameter) boreholes can be drilled rapidly in the highstrength rocks (with 15~20 m cyclic drilling rate); 2) The method of installing the crossshaped steel columns after concrete casting is used so that the shaped steel columns can be installed rapidly and accurately In the end, the job has been fulfilled successfully

Key words: Metro station, highstrength rock, rapid borehole drilling, crossshaped steel column, method of installing steel columns before concrete casting, method of installing steel columns after concrete casting, accurate positioning