拱盖平底水窖结构优化及评定方法

An Optimum Evaluation of the Structure of the Flat-bottomed Water Celler with Partial Sphere Arch-cover

针对目前雨水利用中大量推广应用的拱盖平底水窖结构型式,利用理论力学削球壳体无弯矩薄膜内力计算结果,在分析确定水窖拱盖结构经济合理矢跨比的基础上,利用水窖深径比概念,建立了拱盖平底水窖结构优化数学模型,提出了拱盖平底水窖经济断面深径比求解方法;同时,提出了土方工程容积置换系数和衬砌工程容积置换系数概念并据此分别建立了水窖结构优化评定方法。评定结果显示,优化之后的拱盖平底水窖结构,完成单位蓄水设施容积建设可减少土方开挖量18%以上,完成单位衬砌工程量可增加约11%的蓄水容积,从而显著提高了容积置换系数,大大降低了工程造价。

Targeted at the structural problem of the flat-bottomed water teller with partial sphere arch-cover, widely used in the rain- water harvesting project at the present time, the film inner force is calculated with no bending moment of the partial sphere arch-cov- er. The most economic and rational rise-span ratio of the partial sphere arch-cover structure of the water celler is analyzed and decid： ed based on which, the structural optimization mathematical model of the problem is set up and a new method of resolving the eco- nomic cross-section depth-diameter ratio of the water celler is presented. This paper also puts forward the concepts of dimension transposition coefficients of earthwork and pre-stressed lining work. Based on it, an optimum evaluation model of the structure of water celler is established. According to the results of this optimum evaluation method, the earthwork excavation quantity to con- struct the water storage facilities of one cubic metre can be reduced by 18% at least, the water storage volume will be increased by 11 % or so on unit cubic meter of pre-stressed lining work. Therefore, the dimension transposition coefficients are significantly raised and the construction cost is. immensely cut down.