龙井大桥喀斯特岩溶地质桩基施工技术

Construction Techniques for the Pile Foundation of the Longjing Bridge in Karst Area

根据贵州崇遵高速公路施工现场岩溶地质的特点,在此环境条件下的桩基础施工以机械钻孔为主、人工挖孔和挖钻结合为辅,介绍了采用的孔下埋管导流、人工入孔填砌片石及先挖后钻等简单有效的处理措施,确保了桩基施工质量和进度。为类似工程的施工提供了有益的参考。

According to the karst geological characteristics of the construction site of the Chong-Zun Expressway in Guizhou province, the pile foundation construction in such karst geological conditions should be performed in the following way. holes should be bored chiefly with machinery,supplementally manually, and sometimes drilled in collaboration with manual excavation. Such simple but effective technical measures as laying pipes in the hole to drain, sending workers into the hole to fill-lay rug stones,and the first-dig-and-then-bore method are introduced in the paper, all of which help ensure the construction quality and progress of the pile foundation. The success in the project may serve as a useful reference for other similar projects.