阳江抽水蓄能电站2号支洞封堵施工技术的研究与实施

Study and Implementation of Sealing Construction Technology for#2 Adit of Yangjiang Pumped Storage Power Station

鉴于抽水蓄能电站水头高、灌浆压力大,因而对支洞堵头封堵的整体性、实体及灌浆施工质量要求非常高。阐述了阳江抽水蓄能电站如何通过采用“高流态混凝土+串筒联合”的施工技术措施,解决了封堵混凝土骨料分离、混凝土流动性差及进入钢管底部浇筑不密实等问题;通过智能控制通水冷却速度、温度及在线监测混凝土温度,减少了混凝土裂缝的产生;针对薄弱部位进行补强灌浆,提高了质量保证率。一系列合理、系统性措施的实施,确保了堵头的封堵质量,为水道充水奠定了坚实的基础。

The pumped storage power station has high water head and high grouting pressure,therefore,there are high requirements on the integrity,physicality and grouting construction quality of plug sealing.This article explains how the Yangjiang Pumped Storage Power Station solves the problems of sealing concrete aggregate separation,poor concrete fluidity and uncompact pouring at the bottom of the steel pipe by using high-flow concrete+cascade;through intelligent control of the cooling rate and temperature and online monitoring of the concrete temperature,the occurrence of concrete cracks are reduced;reinforcement grouting is carried out for weak parts to improve its quality guarantee rate.The implementation of a series of systematic measures ensures the sealing quality and lays a solid foundation for water filling in the waterway.