天津站轨道换乘中心逆作法桩柱定位安装技术

Location and Installation Technology of Pile and Column Constructed with Reverse Method in Transfer Center of Tianjin Station

逆作法在大型公共建筑中应用日渐广泛,但其施工工艺、机械设备、技术水平等方面都存在一定的局限性。天津站轨道换乘中心工程为3层纯地下结构,其盖挖逆作法柱长近30m,桩长48-56m。在桩、柱之间无底板或承台过渡情况下,进行单桩单柱连接,这种情况国家规范尚无明确规定。通过实践,提出深位桩桩顶定位标准及桩孔空钻部分垂直度控制标准,详细制定了钢管柱整体吊装定位方法、定位标准及施工技术要点,很好地解决了深孔位下桩、柱连接的技术和质量问题。

Reverse method flourishes extensively in large-scale public buildings, however there are some limitations in construction technology, equipments and technical level. Transfer Center of Tianjin Station is built with the reverse method. The project is an underground structure with three stories, whose column length is close to 30m and pile length varies from 48m to 56m. Single column is connected with each pile without transition of slab or beating platform, and there is no regulation in standards. Through practice, standards for deep pile top location and pile holes verticality control are suggested. Moreover, detailed location method, standard and key construction points are decided to solve the problems in connection of deep pile and column suecessfully.