摘要：【中文】本发明涉及一种大吨位履带吊车复合式基础的施工方法，包括：施工准备；站台拓宽，装配式挡墙施工；铁路营业线隔离保护体系施工。本发明的有益效果是：采用钻孔灌注桩与型钢组合的复合式桩筏基础对大吨位履带吊车作业活动区域进行加固，能最大限度的提高地基的承载力，降低地基沉降，减小对铁路营业线的不良影响，同时采用型钢定位系统，可实现型钢的精准定位，降低了现场施工的难度，有助于提高工程质量和效率；应力释放孔边成孔边采用钢护筒护壁，有效避免了施工过程中出现的坍孔现象，确保了应力释放孔的成孔质量；钢护筒为易拼装可回收式，通过设置凹槽和凸槽，采用高强螺栓固定，降低了安装与拆卸的难度，拼接稳定性好，施工效率高。 【EN】The invention relates to a construction method of a large-tonnage crawler crane combined type foundation, which comprises the following steps: construction preparation; widening a platform and constructing an assembled retaining wall; and (5) constructing an isolation protection system of the railway business line. The invention has the beneficial effects that: the combined pile-raft foundation formed by combining the cast-in-situ bored piles and the profile steel is adopted to reinforce the operation activity area of the large-tonnage crawler crane, so that the bearing capacity of the foundation can be improved to the maximum extent, the foundation settlement is reduced, the adverse effect on a railway business line is reduced, and meanwhile, the profile steel positioning system is adopted, so that the profile steel can be accurately positioned, the difficulty of site construction is reduced, and the engineering quality and efficiency are improved; the steel casing retaining wall is adopted while the stress release hole is formed, so that the hole collapse phenomenon in the construction process is effectively avoided, and the hole forming quality of the stress release hole is ensured; the steel protects a section of thick bamboo and for easily assembling recoverable form, through setting up recess and tongue, adopts high strength bolt fixed, has reduced the degree of difficulty of installation with the dismantlement, and the concatenation stability is good, and the efficiency of construction is high.