Then the structural accident of total section drive-through type crack is caused in arch frame top chord, which is induced by hoisting and detection using pulley arbitrarily.
A manhole cover hoisting tool with pulley structure is designed, including base parts, support parts and pulling parts.
设计了一种滑轮式井盖提升工具，包括底座部分、支撑部分和提升部分等。
3
At present, the cable pulley is widely used in all kinds of general bridge (the door) mobile power supply cranes, electric hoist car, warehouse, shipyard, dock hoisting equipment.