深圳地铁11号线车公庙枢纽高强度岩层中型钢立柱施工关键技术

Case Study on Installation of Shaped Steel Columns in High-strength Rocks in Construction of Chegongmiao Station of Line 11 of Shenzhen Metro

以深圳地铁11号线BT项目11301标车公庙枢纽工程为实例背景，介绍在高强度岩层（单轴抗压强度120 MPa）中快速实施型钢柱安装定位的两项关键技术。其一，通过引进先进的钻岩取芯设备及采用特殊的取芯工艺，确保在高强度岩层中大直径（2.0 m）的钻孔灌注桩快速成孔（一次进尺1.5～2.0 m）；其二，在传统的十字型钢柱安装定位方法（即“先插法”）的基础上，提出全新的优化方案（即“后插法”），提高了工艺时效性，从而达到快速实施的目标。

In the construction of Chegongmiao Station of 1 1301 bid section of Line 1 1 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.