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青铜峡水电站初建时,为弥补蜗壳顶、底板抗拉能力的不足,在蜗壳两侧各设1米×5米×17米平压水箱一个。运行多年后,因管理方面的困难,电厂提出需要了解平压水箱的实际工作状况及对蜗壳应力的调节作用。我院科研所接受委托,结合电站4号机大修,于1986年5月下旬至6月下旬,在蜗壳内埋设数十支仪器,分别测定水箱充水、蜗壳充水条件下,蜗壳顶板,底板和侧墙的应力。经初步分析得知,在水箱充水条件下,蜗壳顶板及底板产生1～3公斤/厘米~2的应压力,对平衡蜗壳充水时顶板及底板产生的拉应力,起到一定作用。
Qingtongxia Hydropower Station was first built, in order to make up for the volute, the floor of the lack of tensile strength, volute on both sides of each set 1 m × 5 m × 17 m pressure tank. After many years of operation, due to the management difficulties, the power plant proposed the need to understand the actual working conditions of the pressure water tank and adjust the stress of the volute. Our institute accepted the commission, combined with the power station No. 4 machine overhaul, in late May 1986 to late June, dozens of instruments embedded in the volute, were measured water tank filled, volute under the conditions of the volute Roof, floor and sidewall stress. The preliminary analysis shows that under the water-filled condition of the water tank, a pressure of 1 to 3 kg / cm ~ 2 is generated on the top and the bottom of the volute, which plays a role in balancing the tensile stress generated by the top plate and the bottom plate when the volute is filled .