利用塑料水管易于加密以强化混凝土冷却

Strengthen the cooling of concrete by polyethylene pipes with small spacing

水管冷却是混凝土坝温度控制的重要措施,以前采用钢管,由于接头多,通常铺设在浇筑层面上,浇筑层中间很难铺设;塑料水管接头很少,管质柔软,在浇筑混凝土的过程中也能铺设,有利于改变水管间距。通过理论分析和实际计算表明,充分利用塑料水管易于加密的优点,可以大幅度地强化混凝土的冷却,降低混凝土温度应力,加快混凝土坝施工速度。计算结果说明,水管充分加密后,即使不预冷骨料,高温季节浇筑层厚3.0 m的混凝土坝块也可防止裂缝。

Pipe cooling is an important measure for temperature control in mass concrete. If the polyethylene pipes are used, the spacing between pipes may be changed easily in the vertical as well as the horizontal directions. It is shown that the effect of pipe cooling may be strengthened a great deal by using small spacings between pipes.