逆作法地铁车站钢立柱定位与安装关键技术

Key Technology for the Top-down Method on Steel Pillar's Positioning and Installation in Metro Station

杭州地铁2号线中河北路站受交通条件限制采用盖挖逆作法施工,盖挖范围内设置了68根"一柱一桩"式永临结合的十字型钢立柱。详细阐述采用万能平台和全回转钻机后插钢立柱施工技术,即完成钻孔桩成孔及水下缓凝混凝土浇筑后,万能平台和全回转钻机精确吊装就位、调平,再将工厂精确加工的钢立柱吊放就位并用全回转钻机下插,下插时采用传感器进行钢立柱精确定位与调整。采用该技术,达到了施工高效、精准的目的,对于类似工程具有一定的借鉴和参考价值。

The cover and excavation top-down method is adopted in the construction of Zhonghebei station of Hangzhou Metro Line 2 due to the traffic condition of the station. 68 cross-shaped steel columns of permanent and temporary use with the ar- rangement of ＂one beam with one pile＂ were set in the covering range. The back inserting steel column technology with a uni- versal platform and 360~ rotator machine is introduced in the paper. After bored piles are formed and depositing of retarded con- crete under water is finished, as well as the universal platform and 360~ rotator machine hoisting are positioned and leveled, the 360~ rotator machine is used to insert the precisely machining steel columns. Sensors are used for horizontal accurate positioning and verticality adjustment when the columns are inserted, with the height mark being strictly controlled. Efficiency and accuracy can be achieved owing to these technologies.