喜河水电站左中孔预应力闸墩设计

Design of Mid Gate Pier on Left Outlet With Pre- stressed Concrete for Xihe Hydropower Station

喜河水电站单宽流量较大,孔口尺寸相应较大,使得表孔弧门推力较大,又由于左中孔坝段右边墩较薄,受不平衡水推力作用,根据规范要求,其边墩需采用预应力结构才能满足较大弧门推力要求。并经多种方案的计算分析,边墩尾部的锚块采用具有颈缩结构的预应力锚块型式。预应力主锚束采用平行布置方式,次锚束采用水平布置方式,有效改善了闸墩颈部受力状态。

The flood discharge of Xihe hydropower station is large, so that the outlet gate is acted by a larger thrust, and should be with larger outlet scale. And because of the abutment pier of left mid outlet is thin, acted by an imbalance thrust, in order to meet the need of arc gate, the pre - stressed concrete should be used to construct the pier according to the standard. Based on calculation and analysis, it is determined that the pre- stressed anchor blocks are used for the tail part of pier with contractive jugular. The pre - stressed concrete master anchor blocks arrange in parallel, and the petit blocks arrange in horizontal, which improve the strained condition of the gate jugular.