建筑工地常采用门式架(俗称“管塔”)及吊盘作垂直运输(图1)。但在施工中,往往因钢丝绳断裂及卷扬机失灵,而发生生产事故;有时在高空推车进吊盘时,因用力过猛,也容易发生堕落事故,甚至伤人。 为了防止吊盘及车具的脱落,工人们革新成了“安全闸杠”和“安全门”。 安全闸杠是用 Construction sites often use gantry (commonly known as “pipe tower”) and hanging for vertical transport (Figure 1). However, during construction, production accidents are often caused by the breakage of wire ropes and the failure of the winches. Sometimes, when the carts are thrown into the trays at high altitude, they are prone to degenerative accidents and even wounding because of excessive force. In order to prevent the hanging plate and vehicles from falling off, the workers have renovated into “safety gate” and “safety gate.” Security bar is used