| 岩溶地区桥墩桩基钢护筒变形加固处治技术 |
| 投稿时间：2018-11-02 修订日期：2019-01-02 点此下载全文 |
| 引用本文：刘运思,牟天光,肖洪波,等.岩溶地区桥墩桩基钢护筒变形加固处治技术[J].钻探工程,2019,46(3):57-62.LIU Yunsi,MOU Tianguang,XIAO Hongbo,et al. Reinforcement treatment of deformation of steel casing ofbridge pile foundation in karst area[J]. Drilling Engineering, 2019,46(3):57-62. |
| 摘要点击次数: 1181 |
| 全文下载次数: 708 |
|
| 基金项目:国家自然科学基金资助项目(编号：51704109;51604109); 湖南省自然科学基金资助项目(编号：2015JJ6038);湖南省教育厅科学基金资助项目(编号：16C0646) |
|
| 中文摘要:本文以大王山矿坑工程中桥墩桩基钢护筒变形事故为研究背景，通过理论分析与现场实际相结合，展开了岩溶地区桥墩桩基础钢护筒变形处治与力学分析研究，其主要研究结论如下：（1）桩钢护筒变形处理采用气切割钢护筒和千斤顶孔内校正变形法，并以内支撑、C30高流态混凝土填充、注浆加固辅佐；（2）型钢内撑采用80 mm×80 mm×2.5 mm矩形钢管，环向布置分为3个三角形，竖向设置间距以0.5 m为最优；（3）桩周预埋8根注浆小导管以及4根小导管向上倾斜插入溶洞内注浆，注浆加固效果明显；（4）气切割法逐层切割，每层切割高度50 cm，环向划分为3块进行切割，并用2 cm厚钢板弯制成2个半圆，焊接封闭成环。本项目研究内容可为类似工程提供理论和实践支持。 |
| 中文关键词:岩溶地区 桩基 钢护筒 变形处治 力学分析 |
| |
| Reinforcement treatment of deformation of steel casing ofbridge pile foundation in karst area |
|
|
| Abstract:This paper relies on the deformation accident of the steel piles in the pile foundation of the Dawangshan mine pit project. Through theoretical analysis combined with the actual situation, The deformation treatment and mechanical analysis of the steel casing of the pier pile foundation in the karst area are carried out. The main research conclusions are as follows: (1) The deformation treatment of the pile steel casing adopts the gas cutting steel casing and the correction deformation method in the jack hole. It is supported by internal support, C30 high-flow concrete filling and grouting reinforcement; (2) The steel inner support adopts 80mm*80mm*2.5mm rectangular steel pipe, and the circumferential arrangement is divided into three triangles, and the vertical spacing is 0.5m. (3) The eight grouting small pipes and four small pipes are embedded in the piles and inserted into the caves to grout. The grouting reinforcement effect is obvious;(4) The gas cutting method is cut layer by layer. The cutting height of each layer is 50cm, the ring direction is divided into three pieces for cutting, and the two semicircles are bent by 2cm thick steel plate, and the welding is closed into a ring. The research content of this project can provide theoretical and engineering practical support for similar projects. |
| keywords:karst area pile foundation steel casing deformation treatment mechanical analysis |
| 查看全文 查看/发表评论 下载PDF阅读器 |
