桥梁逆作承台-群桩复合基础应用与现场实测研究

过超; 付佰勇; 袁洪; 龚维明

doi:10.11779/CJGE201611019

桥梁逆作承台-群桩复合基础应用与现场实测研究 English Version

过超^{1, 2},
付佰勇^{1, 2},
袁洪¹,
龚维明³

1. 中交公路规划设计院有限公司,北京 100088;
2. 公路长大桥建设国家工程研究中心,北京 100088;
3. 东南大学土木工程学院,江苏南京 210096

基金项目: “十二五”交通运输重大科技专项项目（2011318494160）; 交通运输建设科技项目（2014318494020）; 中国交建科技研发项目（2013-ZJKJ-08）

详细信息

作者简介:
过超(1984- ),男,高级工程师,主要从事桥梁基础工程等方面的设计和科研。E-mail: guochao@hpdi.com.cn。

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出版历程
- 收稿日期: 2015-09-27
- 发布日期: 2016-11-19

Application and field tests of cap-pile combined foundation with reversed construction

1. China Communication Highway Planning and Design Institute, Beijing 100088, China;
2. Bridge National Engineering Research Centre, Beijing 100088, China;
3. School of Civil Engineering Southeast University, Nanjing 210096, China

摘要

摘要: 为进一步研究逆作复合基础在桥梁工程中的适用性,开展了桥梁逆作承台-群桩复合基础的实桥应用研究,针对有水和无水的施工环境,分别提出了桩与承台间预留孔采用带剪力连接键的钢护筒和收口网模板的构造设计与连接施工工艺,并通过12组接头承载性能试验验证了工艺方案的可靠性。通过现场实测,揭示了桥梁逆作承台-群桩复合基础受力机理,测试结果表明：采用逆作方案,先施工桩基和预留桩孔的承台,待盖梁施工完成后再封桩,使桩与承台形成整体共同参与受力,能够使封桩前承台底土承担上部荷载,有效发挥浅层地基土的承载能力;封桩后,基础沉降增量和承台底土压力增量均明显减缓,继续增加的上部荷载主要由桩基承担,能够有效控制封桩后桥梁沉降。
- 现场实测 /
- 逆作 /
- 承台-群桩复合基础 /
- 承载性能
Abstract: To further study the applicability of the cap-pile combined foundation in bridge engineering, the application of the cap-pile combined foundation with reversed construction in bridges is carried out. For water and dry construction environments, the structural design and construction technology of the closing net template and steel tube with shear connectors of pile cap prepared hole are proposed, and the reliability of the technological scheme is verified through 12 groups of model tests. The load bearing behavior of the cap-pile combined foundation with reversed construction is revealed by the field tests. The results indicate that the combined foundation, which first constructs piles and the cap with prepared hole, and then make connection between piles and pile cap to shear upper load together after bent cap finished, can make the subsoil of pile cap bear the upper load and take full advantage of the bearing capacity of shallow soil. The increments of foundation settlement and soil pressure significantly decrease after pile connection, and then the increasing upper load is mainly borne by the piles, which can effectively control the settlement of bridges.
- field test /
- reversed construction /
- cap-pile combined foundation /
- load bearing behavior

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参考文献(10)

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