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变截面桩钢护筒护壁和钢护筒跟进法护壁桩基施工是处理桩基多层溶洞和高大溶洞的一种施工手段。作者以湖南省宁道高速公路第六合同段桐油坪大桥0-4#桩施工为例,介绍了该桩施工方案,重点介绍了钢护筒跟进法桩基溶洞施工的具体做法和注意事项。事实证明钢护筒跟进法处理多层高大溶洞是保证质量和安全缩短工期的一种稳妥可靠的施工方案。
Variable cross-section pile steel steel tube wall and steel tube follow-up method Construction of retaining wall pile foundation is a kind of construction method to deal with multi-layer pile cave and high cave. Taking the 0-4 # pile construction of Tongyouping Bridge in the sixth contract section of Ningdao Expressway in Hunan Province as an example, the construction scheme of the pile is introduced, and the concrete practices and precautions of pile foundation caving construction with steel tube follow-up method are introduced emphatically . Facts have proved that the steel tube follow-up method to deal with large-scale multi-storey cave is to ensure quality and safety shorten the duration of a safe and reliable construction program.