基于利用旧路路面承载力的管桩桩帽创新施工技术应用  

Application of Innovative Construction Technology of Pipe Pile Cap Based on Utilizing the Bearing Capacity of Old Road Pavement

作　　者：郑董成 邱志雄 ZHENG Dongcheng;QIU Zhixiong(Guangdong Provincial Expressway Development Co.,Ltd.,Guangzhou Guangdong 510623,China)

机构地区：[1]广东省高速公路有限公司,广东广州510623

出　　处：《广东公路交通》2024年第5期1-5,共5页Guangdong Highway Communications

基　　金：广东省科技厅计划项目“高速公路改扩建工程快速安全建设关键技术研究”(2021B1111610002)。

摘　　要：深汕西高速公路改扩建旧路范围深层软基采用管桩处理方式,结合旧路路面结构层为水泥混凝土面板,分析选择与旧路混凝土面板耦合的管桩桩帽形式。采用有限差分法进行三维建模,研究了无斜向锚定钢筋、1m斜向锚定钢筋和2m斜向锚定钢筋三种工况下路面竖向应力和竖向位移的差异,结果表明,2m斜向锚定钢筋加固工况可更加有效地增强桩帽、桩体与旧路路面结构层的整体性,故管桩桩帽选用更长的2m斜向锚定钢筋。In the reconstruction and expansion of the Shenzhen-Shantou West Expressway,pipe piles are used to treat the deep soft foundation within the old road area.Considering that the pavement structure layer of the old road is made of cement concrete panels,the type of pipe pile caps coupled with the old road concrete panels was analyzed and selected.A three-dimensional modeling was created using finite difference method to study the differences in vertical stress and vertical displacement of the pavement under three working conditions:without inclined anchoring steel bars,with 1m inclined anchoring steel bars,and with 2m inclined anchoring steel bars.The results showed that the reinforcement condition with 2m inclined anchoring steel bars effectively enhanced the integrity of the pile caps,pile bodies and the old road pavement structure layer.Therefore,a longer 2m inclined anchoring steel bar reinforcement solution is selected for the pipe pile cap.

关 键 词：高速公路改扩建 旧路路面结构层 三维建模 斜向锚定钢筋 

分 类 号：U416.222[交通运输工程—道路与铁道工程]