复杂地层大直径变截面超长桩基施工技术应用研究  

Research on the Application of Construction Technology of Large-diameter Variable-cross-section Ultra-long Pile Foundation in Complex Strata

作　　者：侯圆 薛超 王永峰 杨长 Hou Yuan;Xue Chao;Wang Yongfeng;Yang Chang(Power China Road&Bridge Group Co.,Ltd.,Beijing 100048,China;College of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中电建路桥集团有限公司,北京市100048 [2]西南交通大学土木工程学院,成都市610031

出　　处：《北方交通》2024年第7期1-4,9,共5页Northern Communications

摘　　要：大直径变截面超长灌注桩具有可充分发挥结构性能、工程造价低等诸多优势,在高墩大跨桥梁桩基中得到广泛应用。但与等截面桩相比,大直径变截面超长灌注桩的施工工序较多,工艺较为复杂,质量控制相对困难。文章依托新疆某高速公路特大桥桩基工程,针对砂卵石全风化砂岩复合地层大直径变截面超长桩基施工技术进行探讨,分析阐述施工工艺流程,提出施工技术要点,以期为类似工程施工提供借鉴参考。The large-diameter variable-cross-section ultra-long cast-in-place pile is widely used in the pile foundation of the high-pier and long-span bridge with many advantages such as structural performance,low engineering cost and so on.However,compared with the equal-section pile,there are more construction procedures for the large-diameter variable-cross-section ultra-long cast-in-place pile,the process is more complex,and the quality control is relatively difficult.Relying on the pile foundation project of the grand bridge over an expressway in Xinjiang,the construction technology of the large-diameter variable-section ultra-long pile foundation in the composite strata of the sandy cobble fully-weathered sandstone is discussed,the process of construction technology is analyzed and elaborated,and the key points of construction technology are put forward,so as to provide reference for the construction of similar projects.

关 键 词：复杂地层 大直径变截面桩 超长桩 施工方法 技术要点 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]