管径上宽a=b+hk下宽b=a-hk(查下表)沟槽深h(垫层+管径+覆土高度)或(按图纸设计要求)放坡系数K(查下表)沟槽截面积S=(a+b)×h÷2DN501.650.60.70.750.788DN601.650.60.70.750.788DN801.650.60.70.750.788DN1001.750.70.70.750.858DN12500.000DN1501.80.750.70.750.893DN2002.210.80.751.280DN2502.27510.850.751.392DN3002.551.20.90.751.688DN4002.81.310.752.050DN5003.051.41.10.752.448DN6003.31.51.20.752.880DN7003.751.81.30.753.608DN80041.91.40.754.130DN9004.2521.50.754.688DN10004.62.21.60.755.440DN11004.852.31.70.756.078DN12005.12.41.80.756.750公称直径Hs≤30003000≤Hs≤4000Hs>4000公称直径Hs≤3000DN150650————DN7001600DN200700————DN8001700DN300100011001200DN9001800DN400110013001400DN10002000DN500130014001500DN11002100DN600140015001600DN12002200公称直径Hs≤30003000≤Hs≤4000Hs>4000公称直径Hs≤3000DN150950————DN7001900DN2001000————DN8002000DN300130014001500DN9002100DN400140016001700DN10002300DN500160017001800DN11002400DN600170018001900DN12002500求给出放坡系数的基础开挖土方计算公式?解:土方边坡用边坡坡度和坡度系数表示。工程中常用1:K表示放坡坡度。K称坡度系数。设:上宽为a,挖土深度为h,长度为L,放坡系数为k则:下宽b=a-hk那么,挖土方的计算公式是:V=(a+a-hk)/2xHL沟槽挖土方计算表注:红色字体已设有公式,在黑色字体的格输入实际数据即可。没有标注单位为“米”。沟槽基础垫层厚度:一般土质100㎜,较差土质200㎜。放坡开挖沟槽底面宽度表(Hs:管材半强度)有支撑沟槽底面宽度表(Hs:管材半强度)管道规格DN100DN300DN400沟槽宽度650800900在坑内作业在坑上作业一、二类土1.21:0.501:0.331:0.75三类土1.51:0.331:0.251:0.67四类土21:0.251:0.101:0.33管径(㎜)铸铁管、钢管、石棉水泥管塑料管陶土管50~750.60.70.7100~2000.70.80.8250~3500.80.90.9400~4501.01.11.1500~6001.31.41.4700~8001.61.7—900~10001.81.9—1100~12002.02.1—1300~14002.22.4—雨水口连接管沟槽宽度表(㎜)黄色表格摘自04S520图集《埋地塑料排水管施工》57页1.3土方工程放坡系数表绿色表格摘自网上土壤类别放坡起点(m)人工挖土机械挖土室外排水管土方开挖底部宽度混凝土、钢筋混凝土管、预应力钢筋混凝土管0.80.91.01.51.82.02.32.6管道长度L(单位:米)挖土体积V(单位:m3)回填土(单位:m3)管内体积(单位:m3)垫层体积(单位:m3)314.34247.543223.3500.61723.576218.76172.274155.2480.61816.40715.3712.10410.8740.0771.15334.8629.89227.0040.2742.6150.0000.0000.0000.0000.0000.0000.0000.000977.191250.8031167.4350.30783.0611605.322234.4052011.16578.761144.4790.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0000.0003000≤Hs≤4000Hs>40001700180018001900190020002100220022002300230024003000≤Hs≤4000Hs>4000200021002100220022002300240025002500260026002700求给出放坡系数的基础开挖土方计算公式?解:土方边坡用边坡坡度和坡度系数表示。工程中常用1:K表示放坡坡度。K称坡度系数。设:上宽为a,挖土深度为h,长度为L,放坡系数为k则:下宽b=a-hk那么,挖土方的计算公式是:V=(a+a-hk)/2xHL沟槽挖土方计算表注:红色字体已设有公式,在黑色字体的格输入实际数据即可。没有标注单位为“米”。沟槽基础垫层厚度:一般土质100㎜,较差土质200㎜。放坡开挖沟槽底面宽度表(Hs:管材半强度)有支撑沟槽底面宽度表(Hs:管材半强度)黄色表格摘自04S520图集《埋地塑料排水管施工》57页绿色表格摘自网上