【《浠水县某污水处理厂的管网设计计算案例》4300字】

浠水县某污水处理厂的管网设计计算案例目录TOC\o"1-3"\h\u16331浠水县某污水处理厂的管网设计计算案例 1241171.1污水管渠系统设计 1115271.1.1污水管道系统平面布置 199981.1.2管段设计流量 160061.1.3计算设计流量 1135601.1.4设计管段的水力计算 2127241.2雨水管渠系统的设计 359901.2.1划分排水流域 3326551.2.2径流系数 3134541.2.3地面集水时间 3249771.2.4单位面积径流量 3310291.2.5设计流量 41.1污水管渠系统设计1.1.1污水管道系统平面布置根据城市地形及建筑物排列确定排水流域，浠水县地形平坦，无需按等高线划分流域，可直接按面积划分。敷设主干管时根据等高线走向平行敷设最好，干管则与等高线垂直为宜。1.1.2管段设计流量计算设计流量时需要综合考虑每个管段的本段流量，从上一管段流入的转输流量以及流入该管段的集中流量。本次设计已知各街区布置情况，要计算设计流量需要先给每个街区布置好管道，再划分排水面积并对每个区域编号，测量出每个区域的面积，最后根据比流量计算该段管的预计的设计流量。1.1.3计算设计流量（1）人口密度P式中：N——服务的人口（远期），由工程概况可知为10.5万人；F——各个街区的面积之和，经过计算得知为541.24hm2。代入数据得：P=10.5×104541.24（2）比流量q其中q0——单位面积本段平均流量n——综合生活污水定额（L/（人·d））P——人口密度（人/hm2）代入数据得：q（3）总设计流量①总设计流量=平均流量×总变化系数+转输流量+集中流量；②平均流量=本段流量+转输流量；③总变化系数按照公式Kz④本段流量=比流量×污水流入该管段的街区所具有的面积⑤转输流量即从上一管段传递而来的流量⑥集中流量可通过街区平面图得知哪里存在，若有集中流量流入该管段则需加上集中流量，若没有则无需加上。完整计算结果见表7-1。1.1.4设计管段的水力计算知道总设计流量后便需要对管段进行水力计算，每个布置的管段都需要进行水力计算，进行水力计算的步骤如下：①测量出布置管段的长度，每两个检查井之间的管段视为一段；②算出地面坡度以防止选择的管道坡度太小污水无法正常流通；③查表得每个管段的内污水的设计流速及设计坡度和设计充满度以确定该段管应该选择多大的管径；④计算每个管段内污水的水面标高和管内底标高，上下端都计算；⑤确定起始点的埋深后计算各个管段的埋深，本次设计起始点埋深定为1.8m；⑥视情况选择管顶平接还是水面平接。完整计算结果见表7-2.1.2雨水管渠系统的设计1.2.1划分排水流域排水流域的划分需要结合地形及雨量大小考虑，浠水县地形平缓，可将雨水就近排入雨水管道，按此种原则布置管道即划分面积，各排水流域需编号并测量其汇水面积，不同于污水划分流域，雨水划分汇水面积时需要把街道面积考虑在内。1.2.2径流系数降雨时并不是全部的雨水都会流入雨水管道，有相当一部分雨水会渗入土壤或者被植物吸收，而这些没有排入雨水管的降雨便称为径流，该部分的雨量便称为径流量。只需要知道径流量与降雨量的比值就可以知道径流系数，一般都小于1。根据当地土壤条件并查表取该地径流系数Ψ=0.451.2.3地面集水时间地面集水时间是指雨水从汇水面积最远点到第一个雨水口流动的时间，此时间长短受多种因素影响，常见的影响因素为地面坡度、水流距离和道路铺砌材料等，另外暴雨强度也是一个重要因素，雨越大则集水时间越短。按照过往经验，地面集水时间一般不计算而是根据当地地形条件及雨水管道铺设情况直接选取，所以本次设计的地面集水时间也根据以往经验选择确定为t1=10min。1.2.4单位面积径流量单位面积径流量是暴雨强度与径流系数的乘积，即：q其中：Ψ——径流系数，已经选了0.45；q——暴雨强度，L/(s.hm2)。从工程概况可得知的暴雨强度公式：q=式中：——集水时间，min。T=t1+t2式中：t1——地面集水时间，已确定为10min；t2——雨水在管内流动的时间，min。雨水在管道中流通的时间一般从该管段起点开始算距离。通常用这个公式计算时间：式中：L——各检查井之间的雨水管段的长度，m；——雨水在管道内流动的速度（满流），m/s。60——用来换算单位1.2.5设计流量流入布置的雨水管中的雨水的设计流量Q（m3/s）：式中：——单位面积径流量，L/(s·hm2)；F——区域内雨水流入该段管的所有的区域面积之和，hm2。完整计算结果见表7-3表7-1污水干管设计流量计算表管段编号居住区生活污水量Q1集中流量设计流量(L/s)本段流量转输流量q2(L/s)合计平均流量(L/s)总变化系数Kz生活污水设计流量Q1(L/s)本段(L/s)转输(L/s)街区编号街区面积（hm²）比流量q0(L/(s*hm²))流量q1(L/s)1234567891011125~610,1218.200.47.280.007.282.215.800.00.015.8035~611,2717.340.46.940.006.942.215.130.00.015.136~7284.000.41.6014.2215.822.031.520.00.031.5231~713,3015.300.46.120.006.122.213.542.30.015.847~8312.800.41.1221.9423.061.944.084.42.350.7832~832,4611.000.44.400.004.402.310.124.60.014.7236~829,4313.300.45.320.005.322.211.950.00.011.958~945,477.200.42.8832.7835.661.864.9812.713.691.2833~948,6314.500.45.800.005.802.212.910.00.012.9137~944,5912.600.45.040.005.042.311.390.00.011.399~1060,659.600.43.8446.5050.341.888.320.826.3115.4210~110.40.0050.3450.341.888.321.227.1116.6234~1164,7414.700.45.880.005.882.213.070.00.013.0738~1162,7214.900.45.960.005.962.213.220.00.013.2211~1734.600.41.8462.1864.021.7109.390.028.3137.691~20.40.0064.0264.021.7109.390.028.3137.6912~136，919.600.47.840.007.842.216.881.50.018.3839~138，2311.500.44.600.004.602.310.580.00.010.5813~14245.800.42.3212.4414.762.029.6411.91.543.0414~15253.300.41.3214.7616.082.031.992.313.447.6940~1526，4112.700.45.080.005.082.311.477.50.018.9715~16425.800.42.3221.1623.481.944.802.823.270.8041~1640，5514.500.45.800.005.802.212.910.00.012.9116~1756，6115.100.46.0429.2835.321.864.432.826.093.2317~180.40.0035.3235.321.864.433.528.896.7342~1858，6917.600.47.040.007.042.215.340.00.015.3418~2705.800.42.3242.3644.681.879.431.432.3113.132~3719.800.43.92108.70112.621.6180.840.062.0242.8419~203，723.200.49.280.009.282.119.617.60.027.2143~205，1914.400.45.760.005.762.212.833.50.016.3320~2120，2210.200.44.0815.0419.122.037.323.511.151.9244~2118，21，3623.800.49.520.009.522.120.063.70.023.7621~2237，3912.000.44.8028.6433.441.861.374.918.384.5722~230.40.0033.4433.441.861.3712.023.296.5745~2338，5219.300.47.720.007.722.216.650.00.016.6523~2453，5715.600.46.2441.1647.401.883.729.335.2128.2246~2454，6616.200.46.480.006.482.214.250.00.014.2524~3685.200.42.0853.8855.961.797.053.444.5144.953~4679.800.43.92168.58172.501.5264.300.0109.9374.2025~261，416.000.46.400.006.402.214.093.50.017.5947~262，1418.600.47.440.007.442.216.1110.40.026.5126~2715，1711.200.44.4813.8418.322.035.926.113.955.9248~2716，3320.900.48.360.008.362.117.872.30.020.1727~28345.900.42.3626.6829.041.954.135.322.381.7328~290.40.0029.0429.041.954.131.427.683.1349~2935，4921.200.48.480.008.482.118.100.00.018.1029~30506.000.42.4037.5239.921.871.855.229.0106.0550~305110.200.44.080.004.082.39.380.00.09.3830~40.40.0044.0044.001.878.351.734.2114.254~510.000.40.00216.50216.501.5323.530.0145.8469.33表7-2污水主干管水力计算表管段编号管道长度L

(m)设计流量Q

(L/s)管径D

(mm)坡度I流速v

(m/s)充满度降落量

I·L

(m)标高(m)埋设深度

(m)h/Dh

(m)地面水面管内底上端下端上端下端上端下端上端下端12345678910111213141516175~622215.803000.00300.630.380.110.6667.707.456.015.355.9005.2341.802.2235~620315.133000.00300.630.380.110.6097.457.455.765.165.6505.0411.802.416~713431.523500.00210.650.510.180.2817.457.355.174.894.9914.7102.462.6431~719615.843000.00300.630.380.110.5887.407.355.715.135.6005.0121.802.347~834550.784500.00120.600.530.240.4147.357.154.854.434.6104.1962.742.9532~822014.723000.00300.620.370.110.6607.207.155.514.855.4004.7401.802.4136~823811.953000.00370.600.320.100.8817.157.155.454.575.3504.4691.802.688~943491.285000.00110.650.700.350.4777.156.954.504.024.1463.6683.003.2833~926312.913000.00340.600.330.100.8946.996.955.294.395.1904.2961.802.6537~925911.393000.00360.600.310.090.9326.986.955.274.345.1804.2481.802.709~10282115.426000.00070.600.650.390.1976.956.803.963.763.5683.3713.383.4310~11285116.626000.00120.600.650.390.3426.806.503.763.423.3713.0293.433.4734~1127413.073000.00300.600.350.110.8226.706.505.014.184.9004.0781.802.4238~1127313.223000.00300.600.350.110.8196.406.504.713.894.6003.7811.802.7211~1187137.696000.00080.650.700.420.1506.506.453.423.272.9992.8493.503.601~2567137.696000.00080.650.700.420.4546.456.153.272.822.8492.3963.603.7512~1325418.383000.00300.600.470.140.7627.587.395.925.165.7805.0181.802.3739~1311710.583000.00380.600.290.090.4457.387.395.675.225.5805.1351.802.2513~1427738.643500.00240.700.540.190.6657.397.395.164.494.9684.3032.423.0914~1547843.334000.00130.600.600.240.6217.397.104.493.874.2533.6323.143.4740~1539218.973000.00300.600.450.141.1767.067.105.404.225.2604.0841.803.0215~1637370.804500.00130.650.650.290.4857.106.903.873.393.5823.0973.523.8041~1639212.913000.00340.600.330.101.3336.906.905.203.875.1003.7671.803.1316~1731293.235000.00110.650.680.340.3436.906.623.393.043.0472.7043.853.9217~1830396.735000.00110.650.680.340.3336.626.303.042.712.7042.3703.923.9342~1840515.343000.00300.600.390.121.2156.306.304.623.404.5003.2851.803.0218~2374113.136000.00070.600.650.390.2626.306.152.662.402.2702.0094.034.142~3711242.847000.00130.860.700.490.9246.156.022.791.862.2961.3713.854.6519~2023327.213000.00300.740.540.160.6997.507.305.865.165.7005.0011.802.3043~2038016.333000.00300.620.390.121.1407.157.305.474.335.3504.2101.803.0920~2147651.924000.00160.650.600.240.7627.307.054.353.594.1103.3483.193.7044~2137923.763500.00210.600.430.150.7966.957.055.304.505.1504.3541.802.7021~2237284.575000.00110.650.650.330.4097.056.853.573.163.2482.8393.804.0122~2318496.576000.00160.800.480.290.2946.856.623.032.732.7392.4454.114.1845~2338416.653000.00300.620.390.121.1526.506.624.823.674.7003.5481.803.0723~24416128.226000.00130.750.550.330.5416.626.302.732.192.4031.8624.224.4446~2435614.253000.00300.600.380.111.0686.306.304.613.554.5003.4321.802.8724~3389144.957000.00130.750.470.330.5066.306.022.091.591.7621.2564.544.763~4676374.209000.00100.900.600.540.6766.025.901.711.041.1710.4954.855.4025~2623717.593000.00300.600.400.120.7117.157.105.474.765.3504.6391.802.4647~2627426.513000.00300.720.540.160.8227.007.105.364.545.2004.3781.802.7226~2747655.924000.00140.650.650.260.6667.106.904.543.874.2783.6122.823.2948~2728920.173500.00290.650.370.130.8386.856.905.184.345.0504.2121.802.6927~2824481.735000.00120.650.620.310.2936.906.703.823.533.5123.2193.393.4828~2929383.135000.00200.800.500.250.5866.706.503.532.943.2792.6933.423.8149~2929118.103000.00300.600.470.140.8736.356.504.693.824.5503.6771.802.8229~30420106.056000.00120.700.540.320.5046.506.252.922.412.5932.0893.914.1650~302959.383000.00380.600.290.091.1216.106.254.393.274.3003.1791.803.0730~4404114.256000.00120.700.540.320.4856.255.902.411.932.0891.6044.164.304~51105469.3310000.00100.900.580.580.1055.905.903.270.870.3950.2905.505.61表7-3雨水水力计算表（面积叠加法）设计管段编号管长L(m)汇水面积F(hm2)管内雨水流行时间(min)单位面积径流量q0(L/(s·hm2))设计流量Qj(L/s)管径D(mm)坡度l(‰)流速v(m/s)管道输水能力Q`坡降IL(m)设计地面标高(m)设计管内底标高(m)埋深(m)∑t2=t2=L/v∑L/v起点终点起点终点起点终点1234567891011121314151617181~222619.202.44097.901879.7312501.91.5441894.770.42947.617.405.8105.3811.802.0231~22324.904.80397.90479.729000.80.805512.120.18567.507.405.7005.5141.801.892~313324.17.2428641.39979.361912.4812502.01.5841943.850.26607.407.305.3815.1152.022.1932~321517.402.52997.901703.5112501.61.4171738.910.34407.357.305.5505.2061.802.093~434750.211.171093.86172.583643.3018001.11.4983811.950.38177.307.154.5654.1832.742.9733~42219.303.11697.90910.5010001.51.182928.340.33157.137.155.3304.9991.802.1534~422013.202.65797.901292.3211001.81.3801311.460.39607.207.155.4005.0041.802.154~543182.920.804993.55660.895047.9818002.02.0205140.270.86207.156.904.1833.3212.973.5835~528811.803.81097.901155.2511001.51.2601197.420.43206.856.905.0504.6181.802.2836~527817.202.60097.901683.9311003.01.7821693.490.83407.006.905.2004.3661.802.535~6284125.530.770692.18452.936643.2120002.02.1676807.830.56806.906.653.1212.5533.784.106~7284125.532.954972.18451.536734.7820002.02.1676807.830.56806.656.402.5531.9854.104.4237~726511.503.62997.901125.8811001.41.2171156.550.37106.406.404.6004.2291.802.1738~727117.702.92997.901732.8812002.01.5421743.960.54206.626.404.8204.2781.802.127~8188156.541.697491.32046.787321.2420002.42.3747458.130.45126.406.301.9851.5344.424.778~39301160.143.017342.11346.167390.3120002.42.3747458.130.72246.306.301.5340.8114.775.499~1029017.103.21697.901674.1412001.91.5031699.850.55107.617.405.8105.2591.802.1440~101158.501.74197.90832.1710001.31.101864.730.14957.307.405.5005.3511.802.0510~1127739.54.9566322.76484.163324.3316001.61.6703358.560.44327.387.414.8594.4162.522.9911~1247753.37.7211034.70478.444180.8718001.41.6904300.530.66787.417.104.2163.5483.193.5541~1239215.105.68197.901478.3313001.01.1501526.420.39207.087.105.2804.8881.802.2112~1337279.118.10643.06963.655034.5418002.02.0205140.270.74407.106.903.5482.8043.554.1042~1339217.405.28297.901703.5113501.11.2371770.630.43126.806.905.0004.5691.802.3313~14308115.726.457312.43156.026481.7020001.92.1126635.040.58526.906.632.6042.0194.304.6114~15308115.728.887862.43154.226481.7020001.92.1126635.040.58526.636.402.0191.4344.614.9743~1533917.604.56897.901723.0913501.11.2371770.630.37296.386.404.5804.2071.802.1915~16373146.535.885922.92749.807295.9521001.82.1247356.320.67146.406.151.4340.7624.975.3916~44406153.438.812793.10148.227396.6121001.92.1827557.900.77146.106.150.762-0.0095.346.1617~1823522.603.09697.902212.6015001.01.2652235.430.23507.457.305.6505.4151.801.8945~1837917.905.51297.901752.4614000.91.1461764.130.34117.157.305.3505.0091.802.2918~1947856.98.6081054.55576.814370.7218001.51.7494450.660.71707.307.084.6093.8922.693.1946~1937916.905.35897.901654.5613501.01.1791687.610.37906.907.085.1004.7211.802.3619~2037189.818.520743.41163.205675.6520001.41.8135695.700.51947.086.703.6923.1733.393.5320~2118389.821.931291.68259.835675.6520001.41.8135695.700.25626.706.633.1732.9163.533.7147~2134516.005.13997.901566.4413500.91.1191601.730.31056.506.634.7004.39