水电站引水系统中,以往大都采用外加劲梁式钢岔管作为分水器向机组供水。在内水压力作用下,岔管主要承受弯曲应力,材料不能充分利用。随着内水压力P和内径D的增大,加劲梁尺寸也越加宠大,并且制造用材多,运输、安装困难。若为埋藏式,则开挖回填工程量大。近年来所采用的月牙形内加强肋钢岔管,其特点为:体积小,重量轻,加工制造容易,水流边界平顺,结构比较简单,水力学条件好。这种新型的结构形式,在国外六十年代末期才开始用于工程中,并作为技术专利。国内于七十年代末期开始用于工程中,如云 In the diversion system of hydropower stations, most of the past use of external beam steel bifurcation pipe as a water separator to the unit water supply. Under the action of the internal water pressure, the bifurcated pipe mainly bears the bending stress, and the material can not make full use of it. With the increase of the internal pressure P and the internal diameter D, the size of the stiffening girder is also greatly increased, and there are many manufacturing materials which are difficult to transport and install. If burial, excavation backfill project. In recent years, the use of crescent-shaped rib rib steel bifurcation pipe, which is characterized by: small size, light weight, easy processing, smooth flow boundary, the structure is relatively simple, good hydraulic conditions. This new type of structural form, in foreign countries began to be used in engineering in the late 1960s, and as a technology patent. The country began to be used in engineering in the late seventies, such as the cloud