介绍了起重机选型时需遵循的原则，分析了护筒吊装及碰臂的验算方法，阐述了起重机选型的步骤及重点，从而选择出安全性、经济性兼顾的履带式起重机，以提高岩土施工的工效。%The paper introduces the principles for the type selection of cranes,analyzes the calculation methods for the pile casing hoisting and collisions of arms,and illustrates the steps and key points in the crane type selection,so as to select the safe and money-saving craweler crane, in order to improve work efficiency in construction of geotechnical.
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