阿墨江三级水电站厂房混凝土蜗壳施工有关技术

The Concrete Construction Technology of Volute in Power Plant

混凝土蜗壳一般用于大中型水头在40 m以下的低水头电站,它实际上是直接在厂房水下部分大体积混凝土中做成的蜗形空腔.以阿墨江梯级开发第三级水电站的混凝土施工为例,按设计要求,蜗壳外包混凝土需在蜗壳充水保压及控温条件下浇筑,蜗壳内充水保压值为190 m水头（约1.87 MPa）,蜗壳水压试验水温控制在17℃～23℃之间.蜗壳混凝土为C25温控混凝土,允许最高温度为42℃,间歇期不少于5d.为控制混凝土最高温度低于42℃,采取了采用中热硅酸盐水泥,预埋HDPE塑料管通水进行冷却等措施.该工程混凝土施工部分具有施工环境错综复杂,施工技术工艺要求高,工期短等特点,其施工技术值得很多相关工程借鉴.

The concrete spiral casing commonly used to low head hydropower with the waterhead be- low 40 m,it actually make unconstrained style of rotor cavity in under water mass concrete of plant. Take the concrete construction of the third hydropower station about Amojiang River, mainly expound the concrete construction of main power house. The concrete construction has the characteristic like complex construction environment, high -level construction technique, short construction period, the construction technique is worth using for reference to many associated works.