国内部分抽水蓄能电站高压岔管衬砌混凝土现状

Current Situation of Lining Concrete for High-pressure Bifurcated Pipe in Some Domestic Pumped Storage Power Stations

抽水蓄能电站高压水道承受水压力数百米乃至上千米,对高压岔管衬砌混凝土提出了很高的要求。由于钢筋衬砌混凝土具有良好的经济性和施工方便等特点,目前水工隧洞中大量采用钢筋混凝土衬砌。清蓄电站高压岔管采用“泵送混凝土+自密实混凝土”施工方案,其中顶拱部分采用自密实混凝土。从应用的情况来看,自密实混凝土可以有效提高隧洞顶拱衬砌混凝土浇筑饱满度和密实度,减少顶拱混凝土空腔的几率,从而提高混凝土耐久性能。

High-pressure water channel of pumped storage power plant bears water pressure of hundreds of meters or even thousands of meters,which puts forward high requirements for lining concrete of high-pressure bifurcated pipe.At present,reinforced concrete lining is widely used in hydraulic tunnels due to its good economic performance and convenient construction."Pumping concrete+self-compacting concrete"construction scheme is adopted for high-pressure bifurcation pipe of clean-up power station,and self-compacting concrete is used for crown arch part.In terms of application,self-compacting concrete can effectively improve the saturation and compactness of concrete placing for tunnel crown arch lining,reduce the probability of crown arch concrete cavity,and thus improve the durability of concrete.