在构件吊装施工中,经常需要吊车有较长的吊杆但又不减少吊车的起重量。如在厂房屋盖吊装时,屋架单重较大,要求充分发挥吊车的起重能力而不得不将吊杆缩至最短;但在吊屋面板时,则要求吊杆长一些才能将构件送到设计位置上。为此,通常在吊杆上增设一附杆(工地称鹅头),以解决 In the hoisting of components, cranes are often required to have longer booms without reducing the lifting weight of the cranes. For example, when the factory housing is hoisted, the truss has a large single weight, and it is required to fully utilize the lifting capacity of the crane and must minimize the boom; however, when lifting the roof panel, the boom is required to be longer to send the components. Design location. For this purpose, an additional bar (site head called goose head) is usually added to the boom to solve the problem.