大芦线航道整治二期工程(航头—新场段)新建工程5标主墩工程桩质量控制  

Quality Control of Engineering Piles for Bid5 Main Piers of Phase Ⅱ New Project of Dalu Line Navigation Regulation(from Hangtou to Xinchang Section)

作　　者：沈志强 李芬娇 

机构地区：[1]上海市交通建设工程安全质量监督站,上海200030 [2]上海城建工程建设监理有限公司,上海200125

出　　处：《中国市政工程》2018年第3期103-105,共3页China Municipal Engineering

摘　　要：上海软土地基超长大直径钻孔灌注桩施工过程中质量出现不少问题,如钻杆断裂、桩孔缩径、沉渣厚度超标、桩身完整性检测不合格等。为此,在大芦线航道整治二期工程新建工程5标中进行大胆尝试,对传统钻孔灌注桩原地自磨造泥浆施工工艺进行改进与优化,以试成孔检测形式,开展增加膨润土造浆护壁携砂与除砂机除砂相结合工艺,成桩质量显著提高。There are many problems in the construction of the super-long-diameter bored castinplace pile in Shanghai soft soil foundation, such as the fracture of drill rod, the shrinkage of the pile hole, the excess of the sediment thickness and the unqualified testing of the pile integrity. Therefore, a bold attempt is made in the Bid 5 of Phase Ⅱ New Project of Dalu Line Navigation Regulation. The improvement & optimization of in-situ self-drilling mud construction technology for traditional bored piles are made, and the trial hole detection is used to develop the combining process of bentonite slurry wall with sand and sand removal by sand removing machine. The quality of pile forming has been greatly improved.

关 键 词：试成孔检测 膨润土 除砂机 沉渣厚度 

分 类 号：U443.154[建筑科学—桥梁与隧道工程]