黎子明



【摘 要】桥梁桩基础,作为桥梁重要组成部分,其重要性毋庸置疑。但桩基施工均在地面以下,其质量控制难度也同样很大。现结合工程实例,分析钻孔灌注桩质量缺陷成因,并使用成功的处理措施。
【关键词】桥梁工程;地下工程;钻孔灌注桩;质量缺陷;压浆
Talking about the Cause Analysis and Treatment Measures of Pile Foundation Quality Problems in Construction
Li Zi-ming
(Wuhan Erhang Road and Bridge Special Engineering Co., Ltd Wuhan Hubei 430000)
【Abstract】Bridge pile foundation, as an important part of the bridge, its importance is beyond doubt. However, the pile foundation construction is below the ground, and the quality control is also very difficult. Now combined with engineering examples, analyze the causes of quality defects in bored piles and use successful treatment measures.
【Key words】Bridge engineering;Underground engineering;Bored pile; quality defect; grouting
1. 工程及地質概况
1.1 本项目高架桥桥长727m,起点方向左线宽度15.7m,右线宽度11.05m,终点方向桥梁总宽23.6m。上部结构为装配式30m预应力混凝土小箱梁,下部结构采用柱式桥墩,肋板式桥台,钻孔灌注桩基础。
1.2 地质条件。
本项目地层自上往下地层描述如下:
③1层-粉质粘土(Q4al):该层具中等偏高压缩性,较低强度,力学性质较差,推荐地基土容许承载力基本值fa0=100~140KPa。
③1a 层-淤泥质粉质粘土(Q4al):该层具高压缩性,低强度,力学性质差,推荐地基土容许承载力基本值fa0=70~80KPa。
③2 层-粉砂(Q4al):该层低强度,力学性质较差,推荐地基土容许承载力基本值fa0=90KPa。
③3 层-粉质粘土、淤泥质粉质粘土(Q4al):该层具高压缩性,低强度,力学性质差,推荐地基土容许承载力基本值fa0=80~100KPa。
③9 层-粉质粘土(Q4al):该层具高压缩性,低强度,力学性质差,推荐地基土容许承载力基本值fa0=90~100KPa。
④层-粉细砂(Q4al):该层强度较高,力学性质较好,推荐地基土容许承载力基本值fa0=200~300KPa。
⑤1 层-粉质粘土(Q4al):该层具中等压缩性,中等强度,力学性质中等,推荐地基土容许承载力基本值fa0=160~180KPa。
⑤2 层-粉细砂(Q4al):该层强度较高,力学性质较好,推荐地基土容许承载力基本值fa0=200~300KPa。
⑥层-粉细砂(Q4al):该层强度较高,力学性质较好,推荐地基土容许承载力基本值fa0=200~300KPa。
⑥1 层-粉质粘土(Q4al):该层具中等压缩性,中等强度,力学性质中等,推荐地基土容许承载力基本值fa0=160~180KPa。……