摘要
马鹿塘水电站一、二期水头相差112 m,一期工程蜗壳钢筋混凝土结构采用与钢蜗壳联合受力的结构形式,而蜗壳最大设计水头又要按二期建成后的450 m设计,因此在一期设计水头运行时,蜗壳内的水压力小于保压值,则保证蜗壳运行稳定性是设计的难点;同时因蜗壳混凝土结构分担内水压力较大,仍按传统的抗裂设计配筋,钢筋用量太大,对保证蜗壳混凝土的质量难度大,这次蜗壳设计突破传统设计方法,采用按限裂设计配筋,最大限度的减少钢筋量用量,易保证混凝土浇筑质量。
In view of the difference in hydraulic head being 112m between the Phase - 1 and the Phase- 2 of the Malutang hydropower project the spiral case reinforced concrete structure for the Phase - 1 has to be so designed that it should bear the pressure jointly with the steel spiral case, whereas the maximum design head of the spiral case should be designed based on 450m on completion of the Phase - 2. As a result the water pressure within the spiral case should be less than the value of pressure being on the safe side when the phase - 1 is operated under the design water head. It means that how to ensure the operation of the spiral case under a stable and reliable condition is considered as a difficult point in the design. Further, the internal water pressure to be borne by the spiral case concrete structure would be comparably high. If the traditional anti - crack reinforcement design is adopted, a large quantity of reinforcement shall be required and the quality of concrete can not be ensured. Therefore the crack - control reinforcement design has been adopted to minimize the quantity of reinforcement and to ensure the required quality of concrete instead of the traditional design of spiral case. It is a breakthrough made in design of a spiral case.
出处
《云南水力发电》
2005年第5期14-16,34,共4页
Yunnan Water Power
关键词
马鹿塘一期水电站
充水保压
联合承载
限裂设计
Malutang phase - 1 hydropower project
ensuring pressure by filling water
joint beating of load
crackcontrol design
