例】某建筑场地方格网.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,【,例,】,某建筑场地方格网、地面标高如图,格边长,a,=20m,。,泄水坡度,i,x,=2,，,i,y,=3,，,不考虑土的可松性的影响，确定方格各角点的设计标高。,解：,（,1,）初步设计标高,（场地平均标高）,H,0,=,（,h,1,+2,h,2,+3,h,3,+4,h,4,）,/4n,=70.09+71.43+69.10+70.70+2,（,70.40+70.95+69.71+,）,+4,（,70.17+70.70+69.81+70.38,）,/,（,49,）,=70.29,（,m,）,70.09,70.09,（,2,）按泄水坡度调整设计标高：,H,n,=,H,0,L,x,i,x,L,y,i,y,；,H,1,=70.2930,2,+30,3,=70.32,70.32,70.36,70.40,70.44,70.26,70.30,70.34,70.38,70.20,70.24,70.28,70.32,70.14,70.18,70.22,70.26,H,0,70.29,H,2,=70.29102+303=70.36,H,3,=70.29+102+303=70.40,其它见图,70.32,70.36,70.40,70.44,70.26,70.30,70.34,70.38,70.20,70.24,70.28,70.32,70.14,70.18,70.22,70.26,70.09,（,3,）计算各方格角点的施工高度,h,n,：,h,n,=,H,n,H,n,即：,h,n,=,该角点的设计标高,自然地面标高（,m,）,+0.23,-0.04,-0.55,-0.99,+0.55,+0.13,-0.36,-0.84,+0.83,+0.43,-0.10,-0.63,+1.04,+0.56,+0.02,-0.44,h,2,=70.36,70.40=,0.04,（,m,）；,负值为挖方高度,h,1,=70.32,70.09=,0.23,（,m,）,正值为填方高度。,70.32,70.36,70.40,70.44,70.26,70.30,70.34,70.38,70.20,70.24,70.28,70.32,70.14,70.18,70.22,70.26,+0.23,-0.04,-0.55,-0.99,+0.55,+0.13,-0.36,-0.84,+0.83,+0.43,-0.10,-0.63,+1.04,+0.56,+0.02,-0.44,70.09,（,4,）确定零线（挖填分界线）,插入法、比例法找零点,零点连线,h,1,0,0,（,5,）场地土方量的计算：,分别按方格求出挖、填方量，再求整个场地总挖方量、总填方量。,1,）全挖、全填格：,V,挖（填）,=a,2,(h,1,+h,2,+h,3,+h,4,)/4,h,1,h,4,方格角点施工高度绝对值,V,挖（填）,挖方或填方的体积,2,）部分挖、部分填格：,V,挖（填）,=a,2,h,挖（填）,2,/4,h,h,挖（填）,方格角点挖或填施工高度绝对值之和；,h,方格四个角点施工高度绝对值总和。,