大口径玻璃钢管承插式接头局部水头损失系数探究

Local Resistance Coefficient Value of Large-diameter FRP Pipe's Spigot-and-socket Joint

针对大口径玻璃钢管承插式接头局部水头损失系数取值问题,以新疆小洼槽倒虹吸工程为例,结合工程实际选取合理的观测段,并依据多年实测资料,采用伯努利方程原理,初步确定倒虹吸管承插式接头局部水头损失系数。在此基础上,将倒虹吸全段水头损失（包含承插口接头局部水头损失）水力计算结果与上下游水位实测数据进行对比分析,验证该系数取值范围的准确性。最终建议大口径玻璃钢管承插式接头局部水头损失系数ζ取值范围为0.0035～0.005。

The determination of local resistance coefficient value of large-diameter FRP pipe＇s spigot-and-socket joint is an important issue,taking Xiaowacao invert siphon pipe as an example,based on the engineering practice,reasonable observation sections were selected. According to the observed data of many years and the principle of Bernoulli equation,this paper calculated the result that local head loss coefficient of spigot-and-socket joint. An comparative analysis of the measurement data and hydraulic calculation results,which belong to the whole segment inverted siphon（ including that part all spigot-and-socket joints cause）,are used to verify the accuracy of the coefficient range value. It is suggested that the local resistance coefficient value range of large-diameter pipe＇s spigotand-socket joint is 0. 0035 ～ 0. 005.