管径 管材类别埋深/mm管线长/m管外径/mmD。12345110010001100210020001100320010001200420020001200520030001200630010001300730020001300830030001300940010001400104002000140011400300014001250010001500135002000150014500300015001560020001600166003000160017600400016001870050001700197006000170020800600018002180070001800229007000190023900800019002410008000110002510009000110002612001000011200GB50268-2008给排水管道施工规范 B——管道沟槽底部的开挖宽度(mm)； D 0——管外径(mm)；DN b1——管道一侧的工作面宽度(mm)，可按表4.3.2选取； b2——有支撑要求时，管道一侧的支撑厚度，可取150～200mm b3——现场浇筑混凝土或钢筋混凝土管渠一侧模板的厚度(mm)坡顶无荷载坡顶有静载中密的砂土1﹕1.001﹕1.25中密的碎石类土(充填物为砂土)1﹕0.751﹕1.00硬塑的粉土1﹕0.671﹕O.75中密的碎石类土(充填物为黏性土)1﹕0.501﹕O.67硬塑的粉质黏土、黏土1﹕0.331﹕0.50老黄土1﹕0.101﹕0.25软土(经井点降水后)1﹕1.25—边坡坡度(高：宽)土的类别工作面/mm无支撑放坡0.33 有支撑宽度模板厚度管截面积截面积b1b2b367891011100330000.007850.63100660000.007851.92200330000.03140.93200660000.03142.52200990000.03144.77300330000.070651.23300660000.070653.12300990000.070655.67400330000.12561.53400660000.12563.72400990000.12566.57500330000.196251.83500660000.196254.32500990000.196257.47600660000.28264.92600990000.28268.37600020000.28265.6700020000.384658700020000.384659.6800020000.502410.8800020000.502412.6900020000.6358514900020000.63585161000020000.78517.61000020000.78519.81200020001.130426按表4.3.2选取；厚度，可取150～200mm；渠一侧模板的厚度(mm)。坡顶有动载1﹕1.501﹕1.251﹕1.001﹕O.751﹕0.671﹕0.33—开挖土方人工挖土机械开挖人工回填管底沙300mm0.630.040.590.091.92 0.041.880.090.930.080.850.182.520.082.440.184.77 0.084.690.181.230.121.110.273.120.1230.275.670.125.550.271.530.161.370.363.720.163.560.366.570.166.410.361.830.21.630.454.320.24.120.457.47 0.27.270.454.92 0.244.680.548.370.248.130.545.60.245.360.5480.287.720.639.60.289.320.6310.80.3210.480.7212.6 0.3212.280.72140.3613.640.81160.3615.640.8117.6 0.417.20.919.8 0.419.40.9260.48 25.521.08金属类管道、化学建材管道刚性接口400柔性接口300300管道一侧的工作面宽度b1 (mm)混凝土类管道管道的外径D0D0≤500刚性接口500柔性接口400刚性接口600柔件接口500刚性接口 800～1000柔性接口600注：1 槽底需设排水沟时，b1应适当增加； 2 管道有现场施工的外防水层时，b1宜取800mm； 3 采用机械回填管道侧面时，b1需满足机械作业的宽度要求。400500700500＜D0≤10001000＜D0≤15001500＜D0≤3000
