表1-1-4各种类型土方格方量计算项目图示计算公式1、点填方或挖方(3角形)2、点填方或挖方(梯形)3、点填方或挖方(5角形)4、点填方或挖方(正方形)h3h3bcach1h2h4h3bh1h2h4h3h1h2h4h3h1h2h4h3cebdh1h1h2h4bbch1h2h4h3h1h2h4h1h2h4h3方格网法计算场地土方量的步骤与方法1.划分方格:(1)变长10-40m;(2)角点编号(标注在方格左下角);(3)放个编号。(图1-1-2)2确定各方格角点高程(点设计高程为43.24m,其他各点高程根据泄水坡度Ix和Iy均假定为5%,计算后标注在个方格右下角)3地面各角点的挖(+)、填(-)实际高度,即设计标高与地面标高之差(标注在各方格左上角)4确定零线(即挖填分界线)(1.1.9)、、、5确定零线(即挖填分界线)计算各方格内填方数量(分别填入已划分的各方格中,计算方法如下)6分别求挖、填方得总量和挖、填方总量差总挖方量V挖i-j总=∑V挖=361.1m3总填方量V填i-j总=∑V填=361.1m3平均挖填总差V总量差=V挖i-j总-V填i-j总=481.8-363.1m3=118.7m3-39.5m3-8.8m3-14.3m3+25.3m3+4.7m3+32.8m3IY=5%IX=5%043.2443.24+0.3843.7243.34+0.1543.5943.44-0.4243.1243.54-0.5143.1343.64+0.7144.2543.54+0.0543.1943.44-0.5042.8443.84-0.7042.5443.24-0.8942.3043.14-0.7942.2543.04-0.2542.8943.14043.2443.24+0.2643.6043.34+0.5644.0043.44+79.0m3+65.3m3+83.0m3+73.0m31----11----21----31----41----51----61----71----8-16.7m3-193.0m3-137.5m3-72.0m3挖填高度地面高度角点编号设计标高假设方格边长a=20m图1-1-2某场地平整的方格网图