镇墩计算表格

1、水电站压力钢管镇墩抗滑稳定及地基应力计算,1 设计依据和参考资料,（1）设计依据：水电站压力钢管设计规范（SL2812003）,2 设计输入数据,压力钢管设计引用流量Q,8.400m/s,压力钢管内径 D0,1.600m,压力钢管壁厚 t,0.010m,压力钢管满负荷时管内流速 v0,4.178m/s,钢材重度s,76.93kN/m,水的重度w,9.80kN/m,镇墩上游段钢管倾角1,0.000,镇墩下游段钢管倾角2,10.574, 镇墩上游平面投影角1=,10.483, 镇墩下游平面投影角2=,10.378,镇墩上游伸缩节至镇墩距离 L1,5.670m,镇墩下游伸缩节至镇墩距离 L2,1.5

2、00m,镇墩上游伸缩节中心的计算水头 H1,70.000m,镇墩下游伸缩节中心的计算水头 H2,70.912m,镇墩上游端管轴的计算水头 H3,70.000m,镇墩上游端管轴的计算水头 H4,70.550m,镇墩上游段钢管支座的个数 n,1个,镇墩上游段钢管支座的间距l,4.000m,套管式伸缩节内套管外径 D1,1.675m,套管式伸缩节内套管内径 D2,1.600m,套管式伸缩节止水填料与钢管摩擦系数 1,0.3,支座与钢管管壁的摩擦系数 f,0.1, 转弯段实际转角=,20.633, 转弯段转弯半径R=,8.000m, 镇墩材料容重d=,24.00kN/m,3 荷载计算,根据规范A.1.

3、1条，作用于镇墩上的荷载包括：镇墩自重G；镇墩上下游管轴方向作用力；镇墩上下游垂直管,轴方向作用力；,其中镇墩上下游管轴方向作用力包括：钢管自重分力A1；关闭的阀门及闷头上的力A2（本工程无该项作用力）；,弯管上的内水压力A3；渐缩管的内水压力A4（本工程无该项作用力）；弯管中水的离心力的分力A8；,(6)温度变化时支座对钢管的摩擦力A7；,其中镇墩上下游垂直管轴方向作用力包括：钢管自重分力Qs；钢管水重分力Qw；,3.1 单位管长钢管自重qs和单位管长管内水重qw计算,计算公式：,(计入附件自重12%）,（单位管长管内水重）,单位管长钢管自重qs和单位管长管内水重qw计算表,D0,t,s,w

4、,qs,qw,1.6,0.01,76.93,9.8,4.358,19.704,3.2 镇墩上段钢管对镇墩作用力计算,镇墩上段钢管对镇墩作用力计算表,序号,作用力方向,作用力名称,计算公式,上段钢管对镇墩作用力,温升,温降,1,管轴方向,钢管自重分力,0,0,2,弯管上的内水压力,1379.285,1379.285,3,弯管中水的离心力的轴向分力,35.061,35.061,4,伸缩节端部的内水压力,13.504,13.504,5,伸缩节止水盘根对管壁摩擦力,337.882,-337.882,6,温度变化时支座对钢管的摩擦力,9.625,-9.625,7,镇墩上游管轴方向合力A1,1775.35

5、7,1080.343,8,垂直管轴方向,钢管自重分力,8.716,8.716,9,钢管中水重分力,39.408,39.408,10,镇墩上游垂直管轴方向合力Q1,48.124,48.124,3.3 镇墩下段钢管对镇墩作用力计算,镇墩下段钢管对镇墩作用力计算表,序号,作用力方向,作用力名称,计算公式,上段钢管对镇墩作用力,温升,温降,1,管轴方向,钢管自重分力,1.2,1.2,2,弯管上的内水压力,-1390.122,-1390.122,3,弯管中水的离心力的轴向分力,-35.061,-35.061,4,伸缩节端部的内水压力,-13.68,-13.68,5,伸缩节止水盘根对管壁摩擦力,-342.

6、284,342.284,6,温度变化时支座对钢管的摩擦力（下游伸缩节之间无支座，为0）,0,0,7,镇墩下游管轴方向合力A1,-1779.947,-1095.379,8,垂直管轴方向,钢管自重分力,6.426,6.426,9,钢管中水重分力,29.054,29.054,10,镇墩上游垂直管轴方向合力Q,35.48,35.48,（管轴向作用力符号：+为钢管下行方向；-为钢管上行方向）,3.4 钢管对镇墩总的水平推力X及Y、总的垂直力Z计算,计算公式：,钢管对镇墩总的水平推力X、总的垂直力Y计算,工况,A1,A2,Q1,Q2,1,2,1,2,X,Y,Z温升,1775.357,-1779.947,4

7、8.124,35.48,0.000,10.574,10.483,10.378,18.223,639.385,-243.628温降,1080.343,-1095.379,48.124,35.48,0.000,10.574,10.483,10.378,-3.256,391.707,-118.006,上游,下游,工况,X,Y,Z,X,Y,Z,X,Y,Z,温升,1745.724,323.015,48.124,-1727.501,-316.37,-291.752,18.223,639.385,-243.628,温降,1062.311,196.562,48.124,-1065.567,-195.145,-

8、166.13,-3.256,391.707,-118.006,各个工况计算荷载结果,运行工况,检修状况,水压试验情况,温升,温降,温升,温降,X,18.223 ,-3.256 ,3.418 ,-3.417 ,11.129 ,Y,639.385 ,391.707 ,122.484 ,-122.485 ,666.145 ,Z,-243.628 ,-118.006 ,-45.379 ,80.243 ,-248.856 ,各个工况需要的抗滑稳定体积力,3015.421 ,1815.462 ,576.350 ,450.732 ,3135.887 ,抗滑稳定计算：, 镇墩重量的计算：,面积,宽度,体积,底

9、面尺寸,底面面积,纵剖面面积,镇墩,31.15,5,155.75,l,b,h,S,s,钢管占用体积,2.011,6,12.066,143.684,6,5,5,31.15,30,镇墩重量,3566.6628,式中：,镇墩基底摩擦系数f=,0.3,镇墩重量G=,3566.663kN,工况,X,Y,Z,G,f,K,温升,18.223,639.385,-243.628,3566.663kN,0.3,1.558537959,温降,-3.256,391.707,-118.006,3566.663kN,0.3,2.641161121,5 镇墩地基应力计算,对底面y0轴的力矩,计算公式,对底面x0轴的力矩,l

10、x0，ly0,地基应力到x0，y0轴的距离,S,镇墩底面面积,Jx0，Jy0,基础底面对X0，y0轴的惯性矩,h1,lx,ly,Gx,Gy,3.5,0.002,0.2434,0,0,X,Z,G,My,弯矩以顺时针为+,温升,63.7805,59.2990552,0,123.0795552,温降,-11.396,28.7226604,0,17.3266604,Y,Z,G,Mx,温升,2237.8475,0.487256,0,2238.334756,温降,1370.9745,0.236012,0,1371.210512,地基应力,z0-x0平面,工况,Z,G,力矩My,Jy0,ly0,1(kN/m2),2(kN/m2),温升,-243.628,3566.6628,123.0795552,90.293,0.2434,107.01,106.347,温降,-118.006,3566.6628,17.3266604,90.293,0.2434,110.758,110.665,z0-y0平