【《某县给水工程中的管网计算案例》4900字】

某县给水工程中的管网计算案例目录TOC\o"1-3"\h\u12872某县给水工程中的管网计算案例 1221911.1给水管网的布置与定线 13921.2比流量计算 2262381.3沿线流量计算 2158821.4节点流量计算 5162071.5管网平差 6给水管网的布置与定线本设计使用环状网形式定线，定线时只考虑管网的干管和干管之间的连接管。布管遵循干管距离在500~800m、连接管距离在800~1000m之间的原则。该县城有两个工厂，用水量较大；干管接近于平行进行布置，以提高供水的可靠性，事故时用水量为设计用水量的70%。最终布置有56个管段，22个环，管段总长为41659m，具体管网的布置形式见图5-1。图5-1管网平面布置图比流量计算假定用水量均匀分布在所有的干管上。则比流量的计算式为 （5-1）式中，——，L/（s·m）；Q——管网总用水量，L/s；——，L/s；——干管总计算长度，m。管网最高日最高时用水量；；=35298m。则比流量为 沿线流量计算各个管段的沿线流量公式如下： （5-2）式中，——沿线流量，L/s；——该管段管长，m。沿线流量计算详见表5-1表5-1沿线流量计算表管段号管长（m）布水系数计算长度（m）沿线流量（L/s）1-28100.540526.832-39170.5458.530.373-49190.5459.530.444-58330.5416.527.595-69410.5470.531.166-77150.5357.523.687-8991199165.648-9824182454.589-10860186056.9610-11934193461.8611-12818181854.1812-17460.537324.7111-2733173348.5510-3718171847.569-4729172948.298-5748174849.5412-136400.532021.201351144715-16857185756.761684175918-76450.5322.521.3614-11642164242.5215-10638163842.2616-9639163942.3317-8642164242.5213-247070.5353.523.4124-23833183355.1723-22943194362.4622-21863186357.1621-20821182154.3820-19951195162.9919-187290.5364.524.142309220921-16721172147.76207524-256340.531721.0025-268550.5427.528.3226-279630.5481.531.8927-355310.5265.517.5935-28304130420.1428-29565156537.4229-30256125616.9630-31951195162.9931-196220.531120.6026-23618161840.9327-22614161440.6728-21616161640.8030-20607160740.2128-34673167344.5834-33557155736.8933-32970197064.2532-315150.5257.517.0633-30589158939.01总计41659352982338.01节点流量计算节点流量计算式为 （5-3）式中，——节点的流量，L/s；——节点的相关管段的流量，L/s。节点流量计算详见表5-2表5-2节点流量计算表节点编号节点流量（L/s）大用户（L/s）qi（L/s）125.7725.77252.8752.87354.1954.19453.1653.16554.1454.14627.4227.42755.3455.348106.14106.149101.08101.0810104.32104.3211103.56103.561250.0450.041349.5649.5614103.30103.3015104.29104.2916100.84100.8417104.35104.351854.0554.051953.8653.8620103.16103.1621100.05100.0522104.19104.1923103.33103.332449.7949.792524.6624.662650.5750.572745.0745.072871.4771.472927.1987.66114.853079.5991.50171.093150.3250.323240.6640.663370.0770.073440.7440.743518.8718.87总计2338.01179.162517.17管网平差根据节点流量对各管段进行流量初分，依据界限流量表选定管径。表5-3界限流量表管径（mm）界限流量（L/s）管径（mm）界限流量（L/s）管径（mm）界限流量（L/s）100＜935068~96700355~4901509~1540096~130800490~68520015~28.5450130~168900685~82225028.5~45500168~2371000822~112030045~68600237~355最高时平差计算最高时最大流速管是1-2，其流速为1.37m/s，管网控制点是节点32，当地楼层为7层，则最小服务水头为32m，使用软件进行平差计算，平差结果如表5-4所示。表5-4最高时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环一1-2810110011001201245.701303.561.371.55-1.252-11733800800120492.83553.701.101.49-1.0911-12818800800120597.83590.461.181.681.3812-1746110011001201245.701187.841.251.300.96∑0.00环二2-3917900900120700.00696.991.101.29-1.183-10718600600120245.81289.791.031.83-1.3110-11934900900120687.10756.031.191.501.4011-2733800800120492.83553.701.101.491.09∑0.00环三3-4919700700120400.00353.010.921.24-1.144-9729400400120146.84115.270.922.39-1.749-10860800800120500.00617.281.231.831.5710-3718600600120245.81289.791.031.831.31∑0.00环四4-9729400400120146.84115.270.922.391.749-8824600600120300.00303.231.071.991.638-5748350350120100.0080.840.842.37-1.775-4833500500120200.00184.580.941.93-1.60∑0.00环五5-8748350350120100.0080.840.842.371.778-799135035012088.8684.590.882.582.567-671520019912018.4422.180.713.38-2.426-594130030012045.8649.600.702.03-1.91∑0.00续表5-4最高时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环六8-17642500500120205.00193.340.992.101.3517-18945400400120140.71124.730.992.762.6118-764530030012051.9651.430.732.17-1.407-899135035012088.8684.590.882.58-2.56∑0.00环七9-16639600600120245.76328.241.162.301.4716-17828600600120240.06289.921.031.831.5117-8642500500120205.00193.340.992.10-1.358-9824600600120300.00303.231.071.99-1.63∑0.00环八10-15638600600120328.59324.221.152.251.4315-16857600600120295.14293.761.041.871.6116-9639600600120245.76328.241.162.30-1.479-10860800800120500.00617.281.231.83-1.57∑0.00环九11-14642600600120300.00284.571.011.771.1314-15928600600120270.84290.201.031.831.7015-10638600600120328.59324.221.152.25-1.4310-11934900900120687.10756.031.191.50-1.40∑0.00环十12-13640800800120597.83547.341.091.460.9413-14823600600120274.14297.081.051.911.5714-11642600600120300.00284.571.011.77-1.1311-12818800800120597.83590.461.181.68-1.38∑0.00续表5-4最高时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环十一13-24707500500120274.13200.701.022.251.5924-23833350350120112.1767.990.711.721.4323-14726500500120200.00188.150.961.99-1.4514-13823600600120274.14297.081.051.91-1.57∑0.00环十二14-23726500500120200.00188.150.961.991.4523-22943350350120108.8478.720.822.262.1322-15726500500120200.00216.381.102.58-1.8815-14928600600120270.84290.201.031.83-1.70∑0.00环十三15-22726500500120200.00216.381.102.581.8822-21863350350120104.6576.260.792.131.8421-16721500500120200.00231.231.182.92-2.1016-15857600600120295.14293.761.041.87-1.61∑0.00环十四16-21721500500120200.00231.231.182.922.1021-20821350350120104.6081.370.852.401.9720-17736500500120200.00254.181.303.48-2.5617-16828600600120240.06289.921.031.83-1.51∑0.00环十五17-20736500500120200.00254.181.303.482.5620-199511501491201.447.990.462.091.9919-18729400400120138.62122.110.972.66-1.9418-17945400400120140.71124.730.992.76-2.61∑0.00续表5-4最高时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环十六20-30607500500120200.00224.411.142.761.6830-319511501491202.067.180.411.711.6331-1962235035012086.2076.240.792.13-1.3219-209511501491201.447.990.462.09-1.99∑0.00环十七21-28616400400120100.00126.081.002.821.7428-29565450450120150.00137.040.861.851.0529-3025620019912035.1522.190.713.380.8730-20607500500120200.00224.411.142.76-1.6820-21821350350120104.6081.370.852.40-1.97∑0.00环十八22-27614400400120100.00114.640.912.361.4527-35531450450120191.87151.350.952.231.1935-28304400400120173.00132.481.053.090.9428-21616400400120100.00126.081.002.82-1.7421-22863350350120104.6576.260.792.13-1.84∑0.00环十九23-26618350350120100.0074.090.772.021.2526-27963350350120136.9481.780.852.422.3327-22614400400120100.00114.640.912.36-1.4522-23943350350120108.8478.720.822.26-2.13∑0.00环二十24-25634350350120112.1782.910.862.481.5725-2685535035012087.5158.250.611.291.1026-23618350350120100.0074.090.772.02-1.2523-24833350350120112.1767.990.711.72-1.43∑0.00续表5-4最高时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环二十一28-3467330030012051.5350.050.712.071.3934-3355715014912010.799.310.532.771.5533-3058935035012062.0068.320.711.74-1.0230-2925620019912035.1522.190.713.38-0.8729-28565450450120150.00137.040.861.85-1.05∑0.00环二十二30-3358935035012062.0068.320.711.741.0233-329701501491202.727.570.431.891.8332-3151525024912037.9433.090.682.38-1.2231-309511501491202.067.180.411.71-1.63∑0.00消防时平差计算管网控制点是节点32，最小服务水头为10m，节点30和节点32同时发生火灾，单期火灾消防用水量为75L/s。使用软件对管网进行平差计算，平差结果如表5-5所示。表5-5消防时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环一1-2810110011001201245.701387.181.461.73-1.412-11733800800120492.83587.651.171.67-1.2211-12818800800120597.83630.451.251.901.5512-1746110011001201245.701254.221.321.441.08∑0.00环二2-3917900900120700.00746.651.171.46-1.343-10718600600120245.81311.021.102.08-1.5010-11934900900120687.10817.141.291.731.6211-2733800800120492.83587.651.171.671.22∑0.00环三3-4919700700120400.00381.440.991.43-1.324-9729400400120146.84126.041.002.82-2.059-10860800800120500.00679.551.352.181.8710-3718600600120245.81311.021.102.081.50∑0.00环四4-9729400400120146.84126.041.002.822.059-8824600600120300.00346.141.222.542.098-5748350350120100.0091.840.963.00-2.255-4833500500120200.00202.241.032.28-1.89∑0.00环五5-8748350350120100.0091.840.963.002.258-799135035012088.86109.191.144.144.107-671520019912018.4428.840.935.50-3.936-594130030012045.8656.260.802.57-2.42∑0.00续表5-5消防时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环六8-17642500500120205.00222.651.132.721.7517-18945400400120140.71190.671.526.065.7318-764530030012051.9682.691.175.24-3.387-899135035012088.86109.191.144.14-4.10∑0.00环七9-16639600600120245.76358.371.272.711.7316-17828600600120240.06346.951.232.552.1117-8642500500120205.00222.651.132.72-1.758-9824600600120300.00346.141.222.54-2.09∑0.00环八10-15638600600120328.59344.301.222.511.6015-16857600600120295.14330.961.172.342.0016-9639600600120245.76358.371.272.71-1.739-10860800800120500.00679.551.352.18-1.87∑0.00环九11-14642600600120300.00297.401.051.921.2314-15928600600120270.84315.871.122.141.9915-10638600600120328.59344.301.222.51-1.6010-11934900900120687.10817.141.291.73-1.62∑0.00环十12-13640800800120597.83573.731.141.591.0213-14823600600120274.14315.821.122.141.7614-11642600600120300.00297.401.051.92-1.2311-12818800800120597.83630.451.251.90-1.55∑0.00续表5-5消防时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环十一13-24707500500120274.13208.361.062.411.7124-23833350350120112.1771.990.751.911.5923-14726500500120200.00194.040.992.11-1.5414-13823600600120274.14315.821.122.14-1.76∑0.00环十二14-23726500500120200.00194.040.992.111.5423-22943350350120108.8485.330.892.622.4722-15726500500120200.00224.911.152.78-2.0215-14928600600120270.84315.871.122.14-1.99∑0.00环十三15-22726500500120200.00224.911.152.782.0222-21863350350120104.6585.530.892.632.2721-16721500500120200.00241.541.233.17-2.2816-15857600600120295.14330.961.172.34-2.00∑0.00环十四16-21721500500120200.00241.541.233.172.2821-20821350350120104.6098.081.023.392.7820-17736500500120200.00274.591.404.02-2.9617-16828600600120240.06346.951.232.55-2.11∑0.00环十五17-20736500500120200.00274.591.404.022.9620-199511501491201.4417.521.018.948.5019-18729400400120138.62219.311.757.85-5.7218-17945400400120140.71190.671.526.06-5.73∑0.00续表5-5消防时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环十六20-30607500500120200.00251.991.283.432.0830-319511501491202.0622.141.2713.7813.1131-1962235035012086.20182.971.9010.76-6.6919-209511501491201.4417.521.018.94-8.50∑0.00环十七21-28616400400120100.00128.941.032.941.8128-29565450450120150.00148.230.932.141.2129-3025620019912035.1533.381.077.201.8430-20607500500120200.00251.991.283.43-2.0820-21821350350120104.6098.081.023.39-2.78∑0.00环十八22-27614400400120100.00120.530.962.591.5927-35531450450120191.87164.171.032.591.3735-28304400400120173.00145.301.163.661.1128-21616400400120100.00128.941.032.94-1.8121-22863350350120104.6585.530.892.63-2.27∑0.00环十九23-26618350350120100.0077.370.802.191.3526-27963350350120136.9488.720.922.822.7127-22614400400120100.00120.530.962.59-1.5922-23943350350120108.8485.330.892.62-2.47∑0.00环二十24-25634350350120112.1786.580.902.691.7025-2685535035012087.5161.920.641.451.2426-23618350350120100.0077.370.802.19-1.3523-24833350350120112.1771.990.751.91-1.59∑0.00续表5-5消防时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环二十一28-3467330030012051.5354.550.772.421.6334-3355715014912010.7913.810.795.753.2033-3058935035012062.0092.130.963.02-1.7830-2925620019912035.1533.381.077.20-1.8429-28565450450120150.00148.230.932.14-1.21∑0.00环二十二30-3358935035012062.0092.130.963.021.7833-329701501491202.7235.872.0633.6932.6832-3151525024912037.94154.793.1841.44-21.3531-309511501491202.0622.141.2713.78-13.11∑0.00事故时平差计算事故时平差用WSZ软件进行平差，其中节点32为控制点，管段1-2为最大流量管段，1-2也是事故管段，事故流量应该满足最大流量的70％，最大流速管段为12-11，其流速为2.13m/s，事故时最小服务水头为32m，事故时平差结果见表5-6。表5-6事故时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环一1-2810110011001201245.700.000.000.000.002-11733800800120492.83366.610.730.700.5111-12818800800120597.831069.412.135.054.1312-1746110011001201245.701743.981.842.651.98∑不存在环二2-3917900900120700.00329.600.520.32-0.293-10718600600120245.8178.930.280.16-0.1210-11934900900120687.10604.010.950.990.9211-2733800800120492.83366.610.730.70-0.51∑0.00环三3-4919700700120400.00212.730.550.49-0.444-9729400400120146.8457.870.460.67-0.499-10860800800120500.00433.110.860.950.8110-3718600600120245.8178.930.280.160.12∑0.00环四4-9729400400120146.8457.870.460.670.499-8824600600120300.00212.530.751.030.858-5748350350120100.0046.500.480.85-0.645-4833500500120200.00117.650.600.84-0.69∑0.00环五5-8748350350120100.0046.500.480.850.648-799135035012088.8659.080.611.331.317-671520019912018.4414.060.451.45-1.046-594130030012045.8633.250.470.97-0.91∑0.00续表5-6事故时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环六8-17642500500120205.00125.650.640.940.6117-18945400400120140.7188.180.701.451.3718-764530030012051.9634.400.491.03-0.677-899135035012088.8659.080.611.33-1.31∑0.00环七9-16639600600120245.76207.700.730.990.6316-17828600600120240.06208.770.741.000.8217-8642500500120205.00125.650.640.94-0.618-9824600600120300.00212.530.751.03-0.85∑0.00环八10-15638600600120328.59176.810.630.730.4715-16857600600120295.14224.750.801.140.9816-9639600600120245.76207.700.730.99-0.639-10860800800120500.00433.110.860.95-0.81∑0.00环九11-14642600600120300.0026.310.090.020.0114-15928600600120270.84258.910.921.481.3815-10638600600120328.59176.810.630.73-0.4710-11934900900120687.10604.010.950.99-0.92∑0.00环十12-13640800800120597.83639.541.271.951.2413-14823600600120274.14413.061.463.522.9014-11642600600120300.0026.310.090.02-0.0111-12818800800120597.831069.412.135.05-4.13∑0.00续表5-6事故时平差结果表初分流量最终结果环号管段管长l(m)公称直径（mm)计算内径（mm)Chq(L/s)q(L/s)v(m/s)1000ih(m)环十一13-24707500500120274.13191.790.982.071.4624-23833350350120112.1780.440.842.351.9623-14726500500120200.00108.150.550.72-0.5214-13823600600120274.14413.061.463.52-2.90∑0.00环十二14-23726500500120200.00108.150.550.720.5223-22943350350120108.8469.110.721.771.6722-15726500500120200.00137.960.701.12-0.8215-14928600600120270.84258.910.921.48-1.38∑0.00环十三15-22726500500120200.00137.960.701.120.8222-21863350350120104.6559.070.611.331.1421-16721500500120200.00153.090.781.36-0.9816-15857600600120295.14224.750.801.14-0.98∑0.00环十四16-21721500500120200.00153.090.781.360.9821-20821350350120104.6059.460.621.341.1020-17736500500120200.00173.190.881.71-1.2617-16828600600120240.06208.770.741.00-0.82∑0.00环十五17-20736500500120200.00173.190.881.711.2620-199511501491201.445.800.331.151.1019-18729400400120138.6284.750.67