西宁市盐湖小区4号商住楼纠倾扶正

西宁市盐湖小区4号商住楼纠倾扶正

王 桢[1]，张小兵 ¹

（1 中铁西北科学研究院有限公司，甘肃兰州 730000）

[摘要]伴随着城市建筑病害的日益增长，高层建筑物纠倾对现有的纠倾技术不断提出新的挑战。本文以西宁市盐湖小区4号高层商住楼纠倾加固工程为出发点， 分析了其倾斜原因，因地制宜的提出了“以开挖巷道为先导，以截桩迫降为主，锚索加压调控为辅”的组合纠倾方案。将预应力锚索技术巧妙应用到高层建筑物纠倾加固工程领域，极大地提高了纠倾过程中的人为可控性与纠倾精度；面对泥岩地基上桩基础纠倾的难题，创造性的采用间隔钻孔截桩法，使基桩的脆性破坏变为渐进破坏，避免了“突沉”现象的发生；仅用了2个月时间，即使百米高楼 “改斜归正”，纠倾加固后的大楼倾斜率仅有0.42‰，远小于相关规范规定的2.0‰的允许标准，达到了高精度纠倾的目的。

[关键词]高层建筑物；纠倾；截桩；预应力锚索；监测；

The rectification of No.4 commercial and residential building in Salt-lake subdistrict of Xining

Wang zhen¹, Zhang xiao-bing1

（1 Northwest Research Institute Co.,Ltd of C.R.E.C. Lanzhou, Gansu 730000 China )

Abstract: With the growing urban architecture diseases, the rectification of high-rise building is a challenge to existing technology.This paper is based on the rectification project of No.4 commercial and residential building in Salt-lake subdistrict. Through analyses of the tilt causes, a combination rectification program are proposed --"excavating adit as a guide, pile cutting as a mainly measure with ground anchor loading assisted. ". Prestressed ground anchor technology skillfully applied to high-rise buildings rectification and reinforcement greatly improves the human controllable ability and elevates the accuracy; Facing the difficult issues of pile foundation on mudstone, creatively, cutting pile resorts to interval drilled, so that the process of pile ruined changes from a brittle failure to a progressive failure, avoided a "sudden sink" phenomenon; In just 2 months time, the high-rise building more than one hundred meters is successfully rectified, whose tilt rate is only 0.42 ‰, much less than the relevant specification of the allowable standard 2.0 ‰, reached a  high-precision rectification purpose.

Key words:High-rise building;rectification;pile cutting;prestressed ground anchor; monitoring;

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