超深超大深基坑逆作法施工关键技术
投稿时间:2019-07-27  修订日期:2020-05-12  点此下载全文
引用本文:钟 明,曾纪文,贺 浩.超深超大深基坑逆作法施工关键技术[J].探矿工程(岩土钻掘工程),2020,47(6):73-78.
Zhong Ming,Zeng Jiwen,He Hao. Key technology of the top down construction method for oversize deep foundation pit[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2020,47(6):73-78.
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作者单位E-mail
钟 明 武汉地质勘察基础工程有限公司湖北 武汉 430000 499219095@qq.com 
曾纪文 武汉地质勘察基础工程有限公司湖北 武汉 430000 38783470@qq.com 
贺 浩 武汉地质勘察基础工程有限公司湖北 武汉 430000 176029305@qq.com 
中文摘要:武汉南国中心一期基坑支护工程采用逆作法施工,周边环境复杂,场区内砂层较厚,基坑设计技术要求高,特别是支护结构地下连续墙、立柱桩垂直度要求高、嵌岩深,施工时在软硬互层部位容易产生偏斜,入岩效率低。针对工程施工重难点,从设备选型、工艺选择、钻头选用等方面采取措施,解决逆作法超深超大基坑支护结构施工中的困难问题,介绍了解决问题的思路,取得了显著的效果,施工质量满足相关技术要求。
中文关键词:超深基坑  逆作法  旋挖钻机  液压抓斗  地下连续墙  钢管柱桩
 
Key technology of the top down construction method for oversize deep foundation pit
Abstract:The foundation pit support works for the Wuhan Nanguo Center first phase project was constructed using the top down construction method, where the surrounding environment was complex, and the sand layer at the site is thick. The technical requirements for foundation pit design were high, in particular, the verticality of the diaphragm wall and column pile of the support structure was high with deep rock embedment. The soft and hard alternate formation tended to produce deviation during construction with low rock penetration efficiency. In view of the major and difficult points in construction, measures were taken from the aspects of equipment selection, process selection, bit selection, etc. to solve the difficulties in the construction of the super deep and large foundation pit support structure by the top down method. The approach to solving the problems was introduced, and significant results were achieved with the quality meeting the relevant technical requirements.
keywords:ultra deep foundation pit  top down construction method  rotary drilling rig  hydraulic grab  diaphragm wall  steel pipe column pile
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