土工基础

›› 2019, Vol. 33 ›› Issue (2): 124-128.

• 工程实录 • 上一篇    下一篇

长螺旋钻孔压灌成桩工艺在成都基岩地区复合地基中的应用

邓 宇1，马 军2，孟宝华2，章 宁1，梁 摇2   

  1. (1.中冶成都勘察研究总院有限公司，成都 610023；2.四川兴承建筑工程有限公司，成都 610100)
  • 收稿日期:2018-07-09 修回日期:2018-07-20 出版日期:2019-04-20 发布日期:2019-04-22
  • 作者简介:邓 宇 (1980-)，男，高级工程师，注册土木工程师（岩土），研究方向为岩土工程设计及施工。
  • 基金资助:

    四川兴承建筑工程有限公司科研项目(XCJZ-201802)

Application of Pressure Grouted All Flight Auger Cast-in-Place Rock Bearing Concrete Pile in Chengdu Area

DENG Yu1, MA Jun2, MENG Baohua2, ZHANG Ning1, LIANG Yao2   

  1. （1.MCCC Chengdu Surveying Geotechnical Research Institute Co. Ltd., Chengdu 610023；
    2.Sichuan Xingcheng Construction Engineering Co., Ltd., Chengdu 610100）
  • Received:2018-07-09 Revised:2018-07-20 Online:2019-04-20 Published:2019-04-22

摘要： 结合成都东郊慧生时代广场地基处理项目实例，通过长螺旋钻中心压灌成孔方案和旋挖成孔方案的对比，说明了前者在frbk ≤ 5 MPa极软岩地区复合地基成桩中的优越性，即采用长螺旋钻中心压灌成孔工艺保障了成桩质量，节约了施工周期及施工成本，较旋挖成孔桩方案节约工期约17.8%，节约成本约29%。经检测，单桩承载力、复合地基承载力及桩身完整性均满足要求。通过对该工艺常见质量问题及预防措施进行总结，为类似地层项目的设计及施工提供参考。

关键词: 长螺旋钻中心压灌桩, 旋挖成孔, 地基处理, 基岩地区

Abstract: This paper presents a case history of the foundation treatment project of the Huisheng Time Square in east suburban of Chengdu City. Detailed cost comparisons were made between the pressure grouted all flight auger castinplace concrete piles and rotary drilled cast -in-place concrete piles. It was concluded that the grouted auger cast piles is more cost effective in the soft rock with unconfined compressive strength less than 5MPa. Compared with the cast-in-place concrete piles formed by the rotary drilling method, a 17.8% of construction time and a 29% of the construction cost were saved. The selected grouted all flight auger cast-in-place pile were integrity and static loading tested. This paper also summaries the quality control issues.

Key words: pressure grouted all flight auger cast-in-place piles, rotary drilling, foundation treatment, underlying bedrock