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在大体积混凝土施工过程中 ,为满足混凝土温控及接缝灌浆的要求 ,需在其体内埋设冷却水管进行通水冷却。利用双向差分法和有限元法相结合 ,对三峡大坝采用软冷却水管和黑铁管的冷却效果进行了计算与对比分析。结果表明 :采用软管与黑铁管相比 ,在相同的水管布置型式和相同的通水量情况下 ,中后期只需将软管的通水时间延长 4～ 6d,就可以达到与黑铁管相同的降温效果 ;夏天浇筑基础约束区采用软管进行初期通水 ,基础约束区的平均最高温度较采用铁管要高 0 .3℃～ 0 .4℃ ,若将软管埋在浇筑层中间 ,其平均最高温度较铁管埋在层面要低 0 .2℃左右 ;三峡大坝采用软管 ,可节省费用 110 0～ 160 0万元左右。在浇筑层中间铺设软管为加快坝体混凝土的施工进度提供了有利条件。
In mass concrete construction process, in order to meet the requirements of concrete temperature control and joint grouting, it is necessary to embed cooling water pipes in its body to pass water cooling. By using the two-way difference method and the finite element method, the cooling effect of soft cooling water pipe and black iron pipe for Three Gorges Dam are calculated and compared. The results show that compared with the black iron pipe, compared with the black iron pipe, when the same water pipe arrangement type and the same water flow rate are used, the water passage time of the hose is prolonged by only 4 to 6 days in the middle and later periods, The same effect of cooling; summer pouring the basic constraints of the initial hose through the water, the basic constraints of the average maximum temperature higher than the use of iron pipe 0.3 ℃ ~ 0 .4 ℃, if the hose buried in the middle of the pouring layer , The average maximum temperature is about 0.2 ℃ lower than that of the buried pipe at the level of the iron pipe; the hose of the Three Gorges Dam can save about 110 ~ 160 million yuan. Laying the hose in the middle of the pouring layer provides a favorable condition for accelerating the construction progress of the dam concrete.