某污水處理廠雨水管渠系統(tǒng)設計計算案例目錄TOC\o"1-3"\h\u6561某污水處理廠雨水管渠系統(tǒng)設計計算案例 126741劃分計算管段并確定匯水面積 1308392單位面積徑流量 1297523設計管段的設計流量 24414設計管段的水力計算 41劃分計算管段并確定匯水面積在地勢落差不大并且沒有明顯的分水線的區(qū)域，排水流域的劃分可以依據(jù)小區(qū)的街道匯水面積，將每個匯水面積劃分成大概相等。布置時可以充分的利用地形，因地制宜，讓雨水可以在經(jīng)過短距離靠著重力的作用下快速進入水體。該區(qū)域地勢的落差不是很大，分水線也沒有特別明顯，劃分排水流域的話，可以依據(jù)雨水管道服務的街坊面積范圍來確定，可以統(tǒng)一劃分成四個流域。因為本設計的地形很有利于排水，所以管道的布置方式使用分散出水口式。為了能夠讓雨水在最短時間內(nèi)排入水體，雨水的干管設計盡量等高線垂直的方向一致。雨水的支管設置在干管的兩旁道路。把相鄰并且相連的兩個檢測井之間的管段定為計算管段，檢查井從雨水管道的上游到下游進行編號。匯水面積的劃分應該根據(jù)地勢、管道的布置、匯水面積等情況，但是因為該區(qū)域的地形較為平坦，所以就可以按照就近排入的原則來進行劃分，對每塊面積編號，算出對應的面積。2單位面積徑流量單位面積徑流量q式中：φ——徑流系數(shù)，取0.6；Q——降雨強度，L/(s·ha)；降雨強度計算公式為q=式中：t——集流時間（設計降雨歷時）。集流時間計算公式t=式中：t1——地面集水時間，取10min；m——折減系數(shù)，取1；t2——雨水管內(nèi)流行時間。雨水管內(nèi)流行時間計算公式t式中：L——管段長度（m）；V——管段內(nèi)滿流時的雨水流速（m/s）。綜上所述可得：q3設計管段的設計流量管道設計流量QQ=式中：q0——單位面積長度；F——各設計管段匯水面積。計算結(jié)果詳見表4-3表4-3雨水設計流量計算表管段編號匯水面積(ha)匯水時間（min）流量q1(L/s)前端流量q2(L/s)設計流量(L/s)1-23.2610.0022.1022.102-39.9710.0067.5822.1089.6811-32.9410.0019.9319.933-49.5710.0064.87109.61174.484-510.0810.0068.33174.48242.8112-55.2710.0035.7235.725-611.9110.0080.73278.53359.266-712.6410.0085.68359.26444.9513-75.1310.0034.7734.777-88.7910.0059.58479.72539.3014-82.4810.0016.8116.818-99.1510.0062.02556.11618.149-109.0510.0061.35618.14679.4815-164.8210.0032.6732.6716-174.8010.0032.5432.6765.2117-186.2010.0042.0365.21107.2427-189.6410.0065.3565.3518-194.8410.0032.81172.58205.3919-206.1210.0041.48205.39246.8828-204.8410.0032.8132.8120-217.3210.0049.62279.68329.3021-226.1210.0041.48329.30370.7922-239.3610.0063.45370.79434.2429-2313.3410.0090.4390.4323-242.7410.0018.57524.66543.2430-249.7510.0066.0966.0924-258.2310.0055.79609.33665.1125-2612.6910.0086.02665.11751.1331-325.7010.0038.6438.6432-335.5610.0037.6938.6476.3333-345.4610.0037.0176.33113.3442-3412.1710.0082.5082.5034-356.1210.0041.48195.83237.3235-362.3810.0016.13237.32253.4543-361.9810.0013.4213.4236-373.1410.0021.28266.87288.1644-374.5810.0031.0531.0537-384.7610.0032.27319.20351.4745-385.4210.0036.7436.7438-395.7210.0038.77388.21426.9846-397.0510.0047.7947.7939-407.0110.0047.52474.77522.2940-419.6610.0065.48522.29587.7747-484.8510.0032.8832.8848-497.1510.0048.4732.8881.3460-497.2310.0049.0149.0161-4912.8910.0087.3887.3849-504.3010.0029.15217.73246.8862-505.5210.0037.4237.4250-517.4210.0050.30284.29334.5963-515.7810.0039.1839.1864-518.1410.0055.1855.1851-528.4010.0056.94428.95485.8965-525.8910.0039.9339.9352-536.0910.0041.28525.81567.1066-537.0310.0047.6547.6553-546.9110.0046.84614.75661.5967-546.8910.0046.7046.7054-553.6710.0024.88708.29733.1768-556.0110.0040.7440.7455-567.1410.0048.40773.91822.3170-561.8810.0012.7412.7456-574.5010.0030.50835.05865.5669-576.1510.0041.6941.6957-582.5810.0017.49907.24924.7358-592.5110.0017.01924.73941.754設計管段的水力計算水力計算具體步驟：通過上文計算方法計算出單位面積徑流量q0；設計流量=單位面積徑流量×匯水面積。通過上式計算出的設計流量并根據(jù)地面坡度，查水力計算圖明確管道的管徑、坡度、流速等值。通過所查出的設計流速，算出管內(nèi)雨水流行時間t2。降落量=管道長度×管道坡度確定雨水管段的起點埋深與污水管段的起點埋深一樣，取1.98m。管道銜接：采用管頂平接。若相鄰管段的下游流量小于上游，這時候應該舍棄下游流量的這個數(shù)據(jù)，替換為上游管段的設計流量。雨水管道水力計算見下表4-4表4表4-4雨水管道水力計算表管段編號管道長度L(m)設計流量Q(L/s)管徑D(mm)坡度I流速v(m/s)充滿度降落量I*L(m)標高(m)埋深(m)h/Dh(m)地面水面管內(nèi)底上端下端上端下端上端下端上端下端1-2269.0222.103000.000250.311.000.300.074.484.352.732.662.432.362.051.992-3269.0289.684000.000890.711.000.400.244.354.172.662.422.262.022.092.1511-3356.3419.933000.000200.281.000.300.074.434.172.682.612.382.312.051.863-4275.70174.485500.000620.731.000.550.174.174.132.422.251.871.702.302.434-5275.70242.816500.000490.731.000.650.144.134.122.252.111.601.462.532.6612-5381.8235.723500.000290.371.000.350.114.414.122.712.602.362.252.051.875-6292.00359.268000.000350.711.000.800.104.124.112.602.491.801.692.322.426-7292.00444.958500.000390.781.000.850.124.114.052.492.381.641.532.472.5213-7309.9934.773500.000270.361.000.350.094.234.052.532.442.182.092.051.967-8435.40539.309500.000320.761.000.950.144.053.872.382.241.431.292.622.5814-8156.8116.813000.000140.241.000.300.023.953.872.202.181.901.882.051.998-9431.65618.1410000.000320.791.001.000.143.873.562.242.101.241.102.632.469-1030.64679.4811000.000230.711.001.100.013.563.552.102.091.000.992.562.5615-16293.9232.673500.000240.341.000.350.074.444.232.742.672.392.322.051.9116-17265.0665.214000.000470.521.000.400.134.234.072.672.542.272.141.961.9317-18273.53107.244500.000680.671.000.450.194.073.932.542.352.091.901.982.0327-18295.4865.354000.000470.521.000.400.144.153.932.502.362.101.962.051.9718-19278.29205.396000.000540.731.000.600.153.933.832.352.201.751.602.182.2319-20270.02246.886500.000510.741.000.650.143.833.742.202.061.551.412.282.3328-20301.1732.813500.000240.341.000.350.074.093.742.392.322.041.972.051.7720-21148.29329.307500.000420.751.000.750.063.743.552.062.001.311.252.432.30管段編號管段編號管道長度L(m)設計流量Q(L/s)管徑D(mm)坡度I流速v(m/s)充滿度降落量I*L(m)標高(m)埋深(m)h/Dh(m)地面水面管內(nèi)底上端下端上端下端上端下端上端下端21-22243.17370.798000.000380.741.000.800.093.553.522.001.911.201.112.352.4122-23340.69434.248500.000370.771.000.850.133.523.471.911.781.060.932.462.5429-23457.6890.434000.000900.721.000.400.424.023.472.371.951.971.552.051.9223-24405.16543.249500.000320.771.000.950.133.473.441.951.821.000.872.472.5730-24407.9266.094000.000480.531.000.400.203.833.442.181.981.781.582.051.8624-25393.29665.1111000.000220.701.001.100.093.443.371.821.730.720.632.722.7425-2627.64751.1312000.000180.661.001.200.013.373.361.731.730.530.532.842.8331-32377.8938.643500.000340.401.000.350.134.163.822.462.332.111.982.051.8432-33254.8776.334000.000640.611.000.400.173.823.572.332.161.931.761.891.8133-34254.87113.344500.000760.711.000.450.203.573.512.161.971.711.521.861.9942-34376.8382.504000.000750.661.000.400.293.863.512.211.921.811.522.051.9934-35233.02237.326500.000470.721.000.650.113.513.471.921.811.271.162.242.3135-36311.07253.456500.000530.761.000.650.173.473.361.811.641.160.992.312.3743-36227.0313.423000.000090.191.000.300.023.503.361.751.731.451.432.051.9336-37260.86288.167000.000460.751.000.700.123.363.311.641.520.940.822.422.4944-37227.4031.053500.000220.321.000.350.053.473.311.771.721.421.372.051.9437-38322.99351.478000.000340.701.000.800.113.313.281.521.410.720.612.592.6745-38227.0236.743500.000300.381.000.350.073.433.281.731.661.381.312.051.9738-39376.58426.988500.000360.751.000.850.143.283.241.411.270.560.422.722.8246-39277.4747.793500.000510.501.000.350.143.393.241.691.551.341.202.052.0439-40355.31522.299500.000300.741.000.950.113.243.121.271.170.320.222.922.9040-4142.47587.7710000.000290.751.001.000.013.123.091.171.150.170.152.952.9447-48357.5332.883500.000240.341.000.350.093.763.462.061.971.711.622.051.8448-49455.7481.344000.000730.651.000.400.343.463.331.971.641.571.241.892.09管段編號管段編號管道長度L(m)設計流量Q(L/s)管徑D(mm)坡度I流速v(m/s)充滿度降落量I*L(m)標高(m)埋深(m)h/Dh(m)地面水面管內(nèi)底上端下端上端下端上端下端上端下端60-49353.1949.013500.000540.511.000.350.193.493.331.791.601.441.252.052.0861-49353.2787.384000.000840.701.000.400.303.143.331.491.191.090.792.052.5449-50229.48246.886500.000510.741.000.650.123.333.251.191.070.540.422.792.8362-50353.1937.423500.000320.391.000.350.113.433.251.731.621.381.272.051.9850-51311.01334.597500.000430.761.000.750.143.253.081.070.930.320.182.932.9063-51353.2339.183500.000350.411.000.350.123.333.081.631.511.281.162.051.9264-51370.7455.183500.000690.571.000.350.262.833.081.130.870.780.522.052.5651-52260.83485.899000.000350.761.000.900.093.083.030.870.78-0.03-0.123.113.1565-52353.2339.933500.000360.421.000.350.133.293.031.591.461.241.112.051.9252-5382.89567.1010000.000270.721.001.000.023.033.030.780.76-0.22-0.243.253.2766-53399.3147.653500.000510.