岩土与地下工程 2025年 第卷 第22期

DOI: 10.7672 / sgjs2025220017

地铁深基坑装配式拉压双向钢支撑试验与应用分析

王琦¹,刘成龙²

作者简介:

王琦,助理工程师,E,mail:1012511300@ qq. com

作者单位:

1.中铁十四局集团有限公司,山东济南 250101; 2.北京城乡建设集团有限责任公司,北京 100067

基金项目:

∗北京建工集团重点攻关项目(SGGA500920220001)

摘要:

深基坑中的钢筋混凝土支撑浇筑工期长、破除困难、不可重复利用,而钢支撑容易脱落、结构整体性差。依托某地铁车站基坑工程,从设计合理性和实用性角度,提出了具有轴向拉压双向受力性能、可重复利用的装配式钢支撑体系。支撑结构包括活络端、连接件和高强螺栓。分析了装配式钢支撑的受力特点、构件节点连接方式,深入阐述了现场安装技术。通过工程应用,第 1 道装配式钢支撑支护稳定,最大轴力为~1451.4kN.深基坑第 1 层土体开挖过程中,邻近地表最大沉降约为 5.5mm,整体稳定性良好,验证了该工法的有效性。

English:

The pouring period of reinforced concrete supports in deep foundation excavtion is long.Reinforced concrete support is difficult to break and cannot be reused. Steel supports are prone todetachment and have poor structural integrity. Based on the foundation excavtion project of a subwaystation, a modular steel support system structure with axial tension compression bi,directional stressperformance and reusability is proposed from the perspectives of design rationality and practicalapplication. The supporting structure includes flexible ends, connectors, and high wall bolts. This paperanalyzed the stress characteristics and component node connection methods of prefabricated steelsupports, and elaborated on on,site installation and construction techniques. Through engineeringapplication, the first prefabricated steel support is stable with a maximum axial force of -1451.4kN.During the excavation of the first layer of soil in the deep foundation excavtion, the maximum settlementof the adjacent surface is about 5.5mm, and the overall stability is good,which verifies the effectivenessof this construction method.