To study the application of large diameter concrete-filled steel tube (CFST) piles to bridge engineering, a prestressed concrete continuous rigid-frame bridge was cited as an example, the design, construction and testing of the piles of such type were analyzed. The bridge employed the bored pile foundations (4 rock-socketed CFST column plies, each being 1. 8 m in diameter, for a foundation) with elevated pile caps. In accordance with the principle of rational design of the connection structure of the piles, the piles and a pile cap were connected by ring brackets and the piles were embedded in the base rock by double sockets. The piles were constructed by the construction technology of pile planting method and filling stones and grouting mortar at the sides of the piles. The pushing rigidity testing of the single pile by applying horizontal load to the pile top cantilever end proved that the CFST piles of the bridge were safe and reliable.%为研究大直径钢管混凝土桩在桥梁工程中的应用,以某预应力混凝土连续刚构桥为背景,分析该类桩基的设计、施工及试验.该桥采用高桩承台钻孔桩基础(由4根直径为1.8m的钢管混凝土嵌岩柱桩构成),根据桩基连接构造的合理设计原则,钢管混凝土桩与承台采用环形牛腿连接,与基岩采用双套管连接.钢管混凝土桩采用栽桩法和桩侧填石压浆工艺施工.通过对桩顶悬臂端施加水平荷载进行单桩抗推刚度试验,结果证明了该桥钢管混凝土桩是安全可靠的.
展开▼
