钻孔灌注桩穿透厚砂层地质施工技术研究  

Research on Construction Technology of Bored Pile Penetrating the Gedogy with Thick Sand Layer

作　　者：凌汉清 阮茂青 汪盛宇 LING Han-qing;RUAN Mao-qing;WANG Sheng-yu(China Railway Bejing Engineering Group Co.Ltd.,Bejing 102300,China)

机构地区：[1]中铁北京工程局集团有限公司,北京102300

出　　处：《工程建设与设计》2022年第20期144-146,共3页Construction & Design for Engineering

摘　　要：以徽州大道南延项目桥梁钻孔灌注桩施工为背景,介绍了该工程穿透厚砂层地质条件下水下灌注桩基础的施工控制措施,指出砂层地质下,极易出现孔壁塌孔造成的质量、工期、成本甚至安全等方面的不良影响,并综合钻机选择、泥浆指标与水头控制、钻进速率、工序控制以及封底工艺等,总结出在穿透厚砂层地质时的施工控制方法,最终取得了良好的施工效果。Based on the construction of bored cast-in-place piles for the bridge of Huizhou Avenue South Extension project, this paper introduces the construction control measures of the underwater cast-in-place pile foundation under the geological condition of penetrating thick sand layer, and points out that it is easy to have various adverse effects such as quality, time limit, cost and even safety caused by hole wall collapse under the geological condition of sand layer. Combining drilling rig selection, mud index and water head control, drilling rate,working procedure control and bottom sealing technology, the construction control method in penetrating thick sand stratum is summarized,and good construction effect is achieved at last.

关 键 词：钻孔灌注桩 厚砂层 泥浆指标 水下灌注 

分 类 号：U445.551[建筑科学—桥梁与隧道工程]