埋地压力给水管道水平支墩设计计算

Design and calculation of level buttress of buried penstock

埋地压力给水管道支墩标准图集给出了一般支墩的标准图及其尺寸,但实际使用时,发现水平支墩标准图集存在某些不完善之处:当设计参数超出标准图集范围时,从图中查不出支墩尺寸,当实际参数不等于图中参数时,只能从图中得到支墩尺寸的近似值;图集中支墩扩大基础刚性角大于混凝土允许刚性角45°,导致支墩结构不安全。鉴于此,对标准图集中水平支墩的型式及尺寸进行了修正,列出了计算公式,并举例进行了说明。

The standard atlas about level buttress of buried penstock provides the standard figures and general sizes of buttress. But the atlas has the following imperfections ： when the parameters exceed the standard range of the atlas, the buttress size can not be determined; when the actual parameter does not equal to the atlasg parameters, only approximated size of the buttress can be obtained; the rigid angle of buttress expansion - base in the atlas is greater than the limited concrete rigid angle of 45°, resulting in unsafety of the structure. In view of these defects, the author modified the type and dimensions of the level buttress in the standard atlas and provides the related calculation formulas and examples.