摘要
结合青岛海湾大桥大沽河航道桥大直径桩基础施工,对冲击钻、回旋钻及旋挖钻3种类型钻机进行钻孔工艺比选,该桥301号辅助墩19根钻孔灌注桩采用旋挖钻施工。介绍旋挖钻机钻孔的工作原理及施工工艺。针对成孔过程中出现的孔壁坍落造成孔底积泥、钻孔漏浆、缩孔及成孔偏斜问题提出相应的质量控制措施。分析旋挖钻施工的优缺点,经功效成本分析可知,旋挖钻的施工速度及施工成本明显优于回旋钻。
For the construction of the large diameter pile foundations of the Dagu River Shipping Channel Bridge of Qingdao Bay Bridge, the boring construction technology for three types of the boring machines like the percussion boring, rotating boring and rotating excavation were compared and it was determined that the 19 bored piles of the auxiliary Pier No. 301 of the Bridge would be constructed by the rotating excavation. The working principles and the construction technology for the rotating excavation are described herewith. In the light of the problems of the mud depositing at the bottom of bored hole due to the collapse of hole wall, the slurry leakage, hole shrinkage and hole offsetting in the hole formation process, the corresponding quality control measures are formulated. The advantage and disadvantage of the rotating excavation are ana- lyzed. From the analysis of the cost-effectiveness, it can be seen that the construction speed and construction cost of the rotating excavation are obviously superior over those of the rotating boring.
出处
《桥梁建设》
EI
CSCD
北大核心
2009年第A01期39-42,共4页
Bridge Construction
关键词
青岛海湾大桥
自锚式悬索桥
桩基础
钻孔灌注桩
旋挖钻
施工工艺
质量控制
Qingdao Bay Bridge
self-anchored suspension bridge
pile foundation
bored pile
rotating excavation
construction technology
quality control
