球状风化孤石群内端承桩复合成孔施工技术

 

李福清1,3, 王元满2, 胡向东3,4

1.上海隧道工程股份有限公司,上海 200082; 2.上海广联建设发展有限公司,上海 200438; 3.同济大学地下建筑与工程系,上海 200092; 4.同济大学岩土及地下工程教育部重点试验室,上海 200092)

 

  要:在深圳地铁4号线403标,需要在高强度、各向异性、大倾角等特性的球状风化花岗岩孤石群地层中进行端承桩成孔,成孔与周围建筑物距离仅约20 m,且一幢建筑物已严重倾斜,鉴定判断已属于危房等级,经多次论证,最终采用对周边环境影响较小的回转钻孔工艺。先后采用刮刀钻头切削钻进、球齿滚刀钻头碾压钻进、套筒取心钻头环切纠偏等多种钻孔措施相结合的复合钻孔工艺,配以反循环泥浆护壁进行钻孔施工,取得成功。该项技术可为类似地质条件桩基成孔提供良好的技术支持。

关键词:球状风化花岗岩;钻孔桩成孔;滚刀碾压;套筒环切;纠偏

中图分类号:TU473.1+4    文献标识码:A    文章编号:1672-7428(2009)01-0043-06

Composite Construction Technology of Boring for End-bearing Pile in Spherical Weathered Boulders/LI Fu-qing1,3, WANG Yuan-man2, HU Xiang-dong3,4 (1.Shanghai Tunnel Engineering Co., Ltd., Shanghai 200082, China; 2.Shanghai Guanglian Construction and Development Co., Ltd., Shanghai 200438, China; 3.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 4.Key Laboratory of Geotechnical and Underground Engineering Tongji University, Ministry of Education, Shanghai 200092, China)

Abstract: In 403 section of Shenzhen metro Line 4, borehole should be completed for endbearing pile in spherical weathered granite with high strength, anisotropy and large inclined angle, which was only 20m to nearby buildings, so rotary drilling was adopted for safety. Composite drilling technology of drag bit cutting drilling, button roller bit compacting and rectification by annular coring bit was adopted with wall protection by slurry reverse circulation.

Key words: spherical weathered granite; bored drilling pile; hob cutter compaction; annular cutting by thin-wall bit; rectification

 

下载全文:2009010043.pdf

 

 

 

 

 

设备展厅
您是第5606772位访问者  备案许可证编号:京ICP备13036454号
版权所有:《中国矿业》杂志社有限公司
地  址: 北京市朝阳区安定门外小关东里10号院东小楼 邮编:100029 电话:010-68332570 88374940 E-mail: zgkyzzs@163.com