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北京地铁九号线丰台东大街站地层为无水大卵石地层,如何选择围护桩施工机械是本工程桩基施工的关键。在对多种机械成孔方式比选的基础上,初步选择全套管钻机、旋挖钻机进行试桩施工。通过试桩得出,全套管钻机完全适合该地层,对于因场地限制无法施工的部位可辅以旋挖钻机进行施工。
The stratum of Fengtai East Street Station on the 9th line of Beijing Subway is an anhydrous cobble stratum. How to select the construction machinery for the retaining pile is the key to the pile foundation construction of this project. Based on the comparison and selection of a variety of mechanical hole forming methods, the initial selection of full-pipe drilling rig and rotary drilling rig for pilot pile construction. The test pile shows that the full-pipe drilling rig fits perfectly into the stratum, and the construction site that can not be constructed due to site restrictions can be complemented by a rotary drilling rig.