预应力管桩抗拔静载试验免焊反力钢盘连接技术

Free Welding Technology of Counterforce Steel Plate Connection for Pull-Out Static Load Test of Prestressed Pipe Pile

传统预应力管桩抗拔静载试验,需现场焊接延长填芯钢筋,焊接过程存在安全隐患、检测准备时间长等缺点。本技术采用反力钢盘作为反力传导连接枢纽,反力钢盘与管桩顶部的填芯钢筋采用锚具锁定的方法连接;φ40 mm主力钢筋的下部旋入反力钢盘中心孔底部的套筒中,靠螺纹提供反力支持,其上部与架设在主梁上的穿心千斤顶进行锁定,形成一种新型的抗拔桩试验施压传力系统。

Traditional prestressed pipe pile pull-out static load test requires on-site welding to extend the core reinforcement,and the welding process has some disadvantages such as hidden dangers and long preparation time. In this technology,the reaction steel plate is used as the reaction conduction connection hub,and the reaction steel plate is connected with the core filling steel bar at the top of the pipe pile by the method of anchor locking;The lower part of φ40 main steel bar is screwed into the sleeve at the bottom of the center hole of the reaction steel plate,and the reaction support is provided by the thread.The upper part is locked with the piercing jack set up on the main beam,forming a new type of pressure transmission system for the tensile pile test.