土工基础

›› 2019, Vol. 33 ›› Issue (2): 141-144.

• 工程实录 • 上一篇    下一篇

超大直径人工挖孔桩大体积混凝土施工关键技术

易 恒，曾令喜，杨学文   

  1. （深圳市勘察测绘院(集团)有限公司，广东深圳 518028）
  • 收稿日期:2019-02-28 修回日期:2019-03-06 出版日期:2019-04-20 发布日期:2019-04-22
  • 作者简介:易 恒(1984-)，男，工程师，硕士，研究方向为地基与基础的施工及管理。

Mass Concreting Construction for Extra-Large-Diameter Manually Excavated Caissons

YI Heng, ZENG Lingxi, YANG Xuewen   

  1. （Shenzhen Geotechnical Investigation & Surveying Institute （Group） Co. Ltd., Shenzhen  518028）
  • Received:2019-02-28 Revised:2019-03-06 Online:2019-04-20 Published:2019-04-22

摘要： 深圳平安金融中心大厦主塔楼桩基采用桩径5.7 m超大直径桩16根、桩径8.0 m超大直径桩8根，距地铁1号线最近仅17 m。超大直径桩桩径大，单桩桩身混凝土方量多，周边环境复杂，施工技术难度大，可供借鉴、参考的相关资料及施工经验缺乏。结合工程的实际情况，对超大直径桩混凝土浇筑平台进行了优化设计，并详细介绍了超大直径桩大体积混凝土的施工关键技术，如优化混凝土配合比、严控原材料质量、采取一系列施工控制及温度监测措施。检测结果表明，塔楼下24根超大直径桩均为Ⅰ类桩，取得了良好的施工效果，对类似工程项目也具有一定的借鉴作用。

关键词: 地下工程, 人工挖孔桩, 超大直径, 大体积混凝土, 温度监测

Abstract: Shenzhen Ping’an Financial Center Building is supported by extralarge diameter manually excavated caissons. The foundation has a total of sixteen (16) caissons with a diameter of 5.7 meters and a total of eight (8) caissons with a diameter of 8.0 meters. The minimum distance between Shenzhen Ping’an Financial Center Building and Subway No. 1 Line is only 17 meters. A large quantity of concrete is required for a single caisson and concreting conditions are complicated. No previous concreting experience could be found for the similar diameter caissons. Based on the site construction conditions, the proposed concreting platform design was optimized. This paper presents the concreting methods for the extralarge diameter caissons. These methods include appropriate concrete mix design, quality control for cement and aggregate, construction quality control and temperature monitoring. The results indicated that all twentyfour (24) extralarge diameter caissons are Class I caissons.

Key words: underground construction projects, manually excavated caissons, extra-large diameter caissons, mass concrete, temperature monitoring