天津高银117大厦超长双护筒设计与施工关键技术.pdf

2015年7月下 施工技术 第44卷第14期 CONSTRUCTION TECHNOLOGY D0I:10.7672/8js2015140001 天津高银117大厦超长双护筒设计与施工关键技术* 张晓剑1，余地华1，侯玉杰2，黄刚1，叶建2，艾心荧2，刘浩昆2 (1.中建三局集团有限公司，湖北武汉430064： 2.中建三局集团有限公司工程总承包公司，湖北武汉430064) [摘要]对于采用超长摩擦桩来控制建筑物沉降的超高层建筑，如何在试桩试验中较好地消除非有效段桩周侧向 摩擦阻力，为大楼桩基设计提供可靠、准确的试验数据，一直困扰着广大工程建设者.依托天津高银117大厦试桩 工程实际，研发了一套消除桩基非摩擦段侧向摩擦阻力的钢制双护筒装置.该双护筒长26m 由内外护筒组成，外 护筒与周边土一起对内护筒形成侧向约束作用，内护筒在荷载作用下能有效与外护筒脱开并自由沉降，将 42000kN的荷载顺利向下传递.实际应用效果良好. [关键词]桩基础；双护筒；试桩；侧摩阻力：设计；施工技术 [中图分类号]TU753.3 [文献标识码]A [文章编号]1002-8498(2015)14-0001-03 The Key Technology of Design and Construction of Super-long Double Protecting Tube of Tianjin Gaoyin 117 Building Zhang Xiaojian' Yu Dihua' Hou Yujie2 Huang Gang' Ye Jian2 Ai Xinying? Liu Haokun2 (1.China Construction Third Engineering Bureau Group Co.Ltd.Wuhan Hubei 430064 China; 2.General Construction Company of CCTEB Group Co.Lad.Wuhan Hubei 430064 China) Abstract:Because pile test can provide reliable and accurate test data for the pile foundation design the constructors has been plagued by the problem that how to relieve the side friction of non-effective section of test pile better in pile test for super-tall building of which the settlement is controlled by friction super- long pile.Based on the pile test of Tianjin Gaoyin 117 Building a device of steel double protecting tube is developed to relieve the side friction of non-effective section of test pile.The double protecting tube is 26 meters long which poses of internal and external protecting tube.The external protecting...