Up-side-down Hydraulic Lifting Construction of the Internal Steel Barrel of High Chimney Main System Improvement and Properties Analysis of Hydraulic Elevator Control System 高烟囱钢内筒液压提升倒装施工方法矿山提升机液压控制系统的改进设计
Self-climbing barrel formwork system in that of elevator shaft; 电梯井采用自爬升筒模体系;