摘要
新建铁路大同至西安DK427＋438皂角大桥，全长118．13m，桥跨为双线连续梁，设计基础全为钻孔桩群桩基础，单根钻孔桩最长55m，全桥跨越近于垂直的陡坡，施工设计采用深18～20m的地质钻孔帷幕注浆的方法填充岩溶及裂隙，大于4m溶洞采用成孔后在钢筋笼外加跟进钢护筒方法，综合检测桩身混凝土灌注质量，小应变检测认定桩基施工质量合格，没有发现断裂、缩径、夹层和离析等缺陷，有效规避了溶洞对桩基础钻孔灌注桩施工产生的难度及危害，提高了生产率，保证了合同工期。
The DK427＋438 Zaojiao Bridge along the newly-built Datong-Xi＇an railway line is 118.13m long. The bridge adopts double-line continuous beam and foundation supported by clustered bored piles, among which the biggest length is 55m. It crosses over an almost vertical slope. In construction design, 18rn-20m deep geological bored curtain grouting method is used to fill karst caves and crevices. Karst caves bigger than 4m are treated by setting steel retaining cylinder outside steel reinforcement cage after boring. Concrete grouting quality of pile body is generally inspected and small stress inspection is carried out to determine qualified pile foundation construction. No such defects as rupture, shrinkage, delamtnation and separation are detected, difficulties and harmfulness caused by karst caves to bored pile construction in foundation are successfully avoided. Production efficiency is obviously increased and contract schedule is guaranteed.
出处
《建筑技术开发》
2014年第5期21-23,共3页
Building Technology Development
关键词
铁路桥
连续梁
帷幕注浆
岩溶处理
深基础
灌注桩
railway bridge
continuous beam
curtain grouting
karst treatment
deep foundation
filling pile
