钢筋混凝土岔管是中低水头水电站压力水道中常用的一种结构形式,它具有便于就地施工,耐久、维护费用少等优点。从结构特性上说,此类岔管是两个厚壁圆筒或锥管相交。在内水压力、结构自重和地基反力等外荷载作用下,呈现比较复杂的空间应力状态。它的设计和计算是广大水工设计人员面临的一个困难问题。现在,设计厚壁岔管普遍沿用的是平面计算方法。计算图形为两个圆环或椭圆环相交。在内水压力、结构自重的作用下,截面弯矩很大,致使配筋很多,也给施工带来困难。而且配筋的形式也随设计者所截取的计算剖面的形式而异。不少部位钢筋的分布显 Reinforced concrete bifurcation pipe is a kind of structure commonly used in the pressure waterway of medium and low head hydropower stations. It has the advantages of convenient construction, durability and less maintenance cost. Structurally speaking, this type of bifurcated pipe intersects two thick-walled cylinders or cones. Under the action of external loads such as internal water pressure, self-weight of the structure and reaction force of the foundation, the complex spatial stress state is presented. Its design and calculation is a difficult problem facing the majority of hydraulic designers. Nowadays, the design of thick-walled bifurcation is generally followed by the plane calculation method. Calculates the intersection of two circles or ellipses. Under the action of internal water pressure and self-weight of structure, the bending moment of the section is very large, resulting in a lot of reinforcement and also brings difficulties to the construction. And the form of the reinforcement also varies with the form of the calculated section taken by the designer. Many parts of the distribution of steel was significant