兰州理工大学学报

2020, v.46;No.206(06) 131-136

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装配式钢管混凝土内支撑在盾构竖井深基坑工程中的应用
Engineering application of prefabricated concrete-filled tube bracing in deep excavation for shield shaft

郭雪源;张明聚;武立伟;韩流涛;
GUO Xue-yuan;ZHANG Ming-ju;WU Li-wei;HAN Liu-tao;College of Civil and Architectural Engineering, North China University of Science and Technology;Beijing Collaborative Innovation Center for Metropolitan Transportation, Beijing University of Technology;

摘要(Abstract):

针对盾构竖井内开挖深基坑时出土作业面小、基坑深度大等特点,提出一种装配式钢管混凝土(PCFT)内支撑结构.该PCFT内支撑结构由双肢矩形钢管轻集料混凝土构件和锚固件通过高强螺栓装配而成.以北京地铁17号线某盾构竖井深基坑工程为背景,开展PCFT内支撑基坑支护设计及应用.对支撑轴力、围护桩变形、桩顶位移和地表沉降进行了信息化监测,并在工程实践中总结和优化PCFT内支撑设计及施工技术.实施效果和监测结果表明:PCFT内支撑架设施工技术简便易行,在有效控制基坑稳定和周边环境安全的基础上,极大地提高了盾构竖井深基坑工程施工安全性和便利性.
In view of reality of small working surface and large depth of foundation pit when a deep foundation pit is excavated in shield shaft, a prefabricated concrete filled tube(PCFT) internal bracing structure is presented. The PCFT internal bracing consists of lightweight aggregate concrete members and anchors composed of double-limb rectangular steel tubes, and assembled by high-strength bolts. Taking the deep foundation pit project of a shield shaft in Beijing Metro Line 17 as background, research on the design and application of PCFT internal bracing foundation pit support were carried out. In the study, the information monitoring of supporting axial force, retaining pile deformation, pile top displacement and surface settlement was also carried out. The design technology of PCFT internal bracing is summarized and optimized later in engineering practice. The implementation effect and monitoring results show that erection construction technology of PCFT internal bracing is simple and easy. On the basis of effectively controlling the stability of the foundation pit and the safety of the surrounding environment, the PCFT internal bracing greatly improves the safety and convenience of shield shaft deep foundation pit construction.

关键词(KeyWords): 盾构竖井基坑工程;基坑内支撑;钢管混凝土;装配式结构
deep excavation of shield shaft;bracing of pit supporting;concrete-filled tube;prefabricated structure

Abstract:

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基金项目(Foundation): 国家自然科学基金(51538001);; 河北省自然科学基金(E2020209086);; 唐山市科技局项目(19150240E)

作者(Author): 郭雪源;张明聚;武立伟;韩流涛;
GUO Xue-yuan;ZHANG Ming-ju;WU Li-wei;HAN Liu-tao;College of Civil and Architectural Engineering, North China University of Science and Technology;Beijing Collaborative Innovation Center for Metropolitan Transportation, Beijing University of Technology;

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