防洪工程排洪渠施工工程布置和主要建筑物设计方案

防洪工程排洪渠施工工程布置和主要建筑物设计方案1.1工程等级和设计标准本工程的主要任务是防洪，满足能通过设计洪水流量以保证集镇安全，根据《防洪标准》GB50201-94，《城市防洪工程设计规范》GJJ50-92，《水利水电工程等级划分及洪水标准》（SL-2000）和《防洪标准》（GB50201-94）规范的规定，工程保护范围为一般城镇的一部分，确定工程的建筑物等别为4级。根据《防洪标准》（GB50201-94）和《防洪工程设计规范》（GB50286-98）的有关规定，防洪工程等级为4级，防洪标准为10年一遇洪水。根据《建筑抗震设计规范》（GB50011-2001）和《中国地震动参数区划图》（GB183306-2001），工程区抗震设防烈度为Ⅵ度，根据《水工建筑物抗震设计规范》DL5073—2000的规定，本工程构筑物可不进行抗震设计与计算，但应进行抗震构造处理。1.2工程布置1.2.1工程布置的原则根据地形、地质条件和工程目的，轴线布置考虑以下原则：1）与天然河沟及公路走向基本一致；2）轴线布置力求投资最省，同时注意对道路、边坡稳定的影响；3）轴线布置力求平顺，使水流条件较好；4）轴线布置应本着少占耕地，少拆迁房屋，有利防汛抢险和工程管理。1.2.2工程布置方案根据本防洪工程的任务和布置原则，确定轴线基本沿原自然排水线路布置，走向平顺、光滑。高家镇防洪工程防洪标准为10年一遇，新建排洪渠3条，其中1#排洪渠设计总流量Q=22.40m3/s，总长1744m，主要由明渠及盖板渠道组成，起点位于高家镇烧砖厂，末端接已建箱涵。1#排洪渠0+000～0+600为明渠，断面形式为半梯形；0+600～1+744段渠道沿线大部分为已建房屋院坝，设计中考虑防洪渠在已建房屋院坝前设钢筋砼盖板，以方便交通，无房屋院坝位置仍为明渠。2#排洪渠设计总流量Q=1.55m3/s，总长488m，全部为明渠，起点位于高家镇悼念馆，末端接已建箱涵；3#排洪渠设计总流量Q=3.32m3/s，总长530m，为明渠及跌水，起点位于高家镇加油站，末端接河沟，3#排洪渠明渠断面形式为半梯形，长490m，跌坎长40m。1.3主要建筑物1.3.1主要建筑物布置高家镇防洪工程防洪标准为10年一遇，新建排洪渠3条，其中1#排洪渠设计总流量Q=22.40m3/s，总长1744m，主要由明渠及盖板渠道组成，起点位于高家镇烧砖厂，末端接已建箱涵。1#排洪渠0+000～0+600为明渠，断面形式为半梯形，其余为明渠+钢筋砼盖板；2#排洪渠设计总流量Q=1.55m3/s，总长488m，全部为明渠，起点位于高家镇悼念馆，末端接已建箱涵；3#排洪渠设计总流量Q=3.32m3/s，总长530m，为明渠及跌水，起点位于高家镇加油站，末端接河沟，3#排洪渠明渠断面形式为半梯形，长490m，跌坎长40m。排洪渠：全断面衬砌，底板为C15砼，边墙为M10浆砌条石，临水面采用M10水泥砂浆抹面。1）1#排洪渠桩号0+000～0+450段，设计流量Q=4.99m3/s，坡比1/20，断面尺寸0.8×1.0m（宽×高）；0+450～0+680段，设计流量Q=4.99m3/s，坡比1/15，断面尺寸0.8×1.0m；0+680～1+000段，设计流量Q=14.70m3/s，坡比1/15，断面尺寸1.2×1.3m（宽×高）；1+000～1+600段，设计流量Q=14.70m3/s，坡比1/13.5，断面尺寸1.2×1.3m（宽×高）；1+600～1+744段，设计流量Q=22.40m3/s，坡比1/13.5,断面尺寸1.5×1.4m（宽×高）。2）2#排洪渠桩号0+000～0+340段，设计流量Q=1.55m3/s，坡比1/28，断面尺寸0.5×0.8m（宽×高）；0+340～0+488段，设计流量Q=1.55m3/s，坡比1/400，断面尺寸1.0×1.0m。3）3#排洪渠桩号0+000～0+230段，设计流量Q=1.39m3/s，坡比1/38，断面尺寸0.5×1.0m（宽×高）；0+230～0+280段，设计流量Q=3.32m3/s，坡比1/38，断面尺寸0.8×1.0m；0+280～0+490段，设计流量Q=3.32m3/s，坡比1/32，断面尺寸0.8×1.0m。4）跌水跌水基础置于基岩层，底板采用C20钢筋砼现浇，并设置锚杆锚固于基岩中，两侧挡墙采用M10浆砌条石挡墙，迎水侧直立，背水侧坡比1：0.3，跌水以下设置干砌块石海漫。1.3.2水力计算1、排洪渠各分段设计流量成果采用第二章洪水计算成果。2、各分段起始断面水深计算采用黄河水利职业技术学院编制的渠道水力计算程序（作者：罗全胜、张耀先）进行计算。3、水面曲线计算方法：根据以上确定的基本参数，采用新疆水利厅编制的《水力水电工程程序集》中的D-7“明渠恒定非均匀流水面曲线计算程序”进行该排洪渠的水面曲线计算。程序的计算原理及基本公式如下：（1）正常水深h0的计算按照:已知：;代入得：求ho即为求解下列方程的根：采用二分法求解，如图1设h1〈h0〈h2令：于是若J与K同号，令h2=h；J=K若J与K异号，令h1=h2；h2=h;J=K继续二分即令h≈(h1+h2)/2重新计算，直到∣h1-h2∣≤允许误差为止。（2）水面曲线计算人工渠槽断面单位能量沿程变化的微分方程其差分格式为：即：式中：其中：h1为已知，h2为欲求之水深为此，将差分方程改为下列函数表达式为求h2设试算水深h下限与h上限，用二分法求解若D、G同号，令h上限=h2；D=G若D、G异号，令h上限=h下限；h上限=h2；D=G继续二分，直到∣h1-h2∣≤允许误差为止4.过水断面设计该堤防工程主要建筑物级别为4级，次要建筑物为4级。依据《城市防洪工程设计规范》（CJJ50-92)规定，安全加高值为0.4m。根据水面曲线计算成果加上安全加高取整后确定过水断面尺寸。根据上述计算原则，集镇水力计算成果见下表：高家镇1#排洪渠水力计算成果表表5-1桩号渠底高程（m）渠顶高程（m）设计流量（m3/s）设计水位（m）坡度断面尺寸（宽m×高m）渠道形式0+000338.70339.904.99339.481/200.8×1.2明渠0+020337.70338.904.99338.481/200.8×1.20+040336.70337.904.99337.481/200.8×1.20+060331.70336.904.99336.481/200.8×1.20+080334.70331.904.99331.481/200.8×1.20+100333.70334.904.99334.481/200.8×1.20+110333.20334.404.99333.981/200.8×1.20+120332.70333.904.99333.481/200.8×1.20+140331.70332.904.99332.481/200.8×1.20+160330.70331.904.99331.481/200.8×1.20+180329.70330.904.99330.481/200.8×1.20+200328.70329.904.99329.481/200.8×1.20+220327.70328.904.99328.481/200.8×1.20+240326.70327.904.99327.481/200.8×1.20+260321.70326.904.99326.481/200.8×1.20+280324.70321.904.99321.481/200.8×1.20+300323.70324.904.99324.481/200.8×1.20+320322.70323.904.99323.481/200.8×1.20+340321.70322.904.99322.481/200.8×1.20+360320.70321.904.99321.481/200.8×1.20+380319.70320.904.99320.481/200.8×1.20+400318.70319.904.99319.481/200.8×1.20+420317.70318.904.99318.481/200.8×1.20+440316.70317.904.99317.481/200.8×1.20+450316.20317.404.99316.981/200.8×1.20+460311.53316.734.99316.241/150.8×1.20+480314.20311.404.99314.911/150.8×1.20+500312.87314.074.99313.581/150.8×1.20+520311.53312.734.99312.241/150.8×1.20+540310.20311.404.99310.911/150.8×1.20+560308.87310.074.99309.581/150.8×1.20+580307.53308.734.99308.241/150.8×1.20+600306.20307.404.99306.911/150.8×1.2明渠+盖板0+620304.87306.074.99301.581/150.8×1.20+640303.53304.734.99304.241/150.8×1.20+660302.20303.404.99302.911/150.8×1.20+680300.87302.074.99301.581/150.8×1.20+700299.53301.039.78300.591/151.2×1.50+720298.20299.709.78299.261/151.2×1.50+740296.87298.379.78297.931/151.2×1.50+760291.53297.039.78296.591/151.2×1.50+780294.20291.709.78291.261/151.2×1.5明渠0+800292.87294.379.78293.931/151.2×1.50+820291.53293.039.78292.591/151.2×1.5明渠+盖板0+840290.20291.709.78291.261/151.2×1.50+860288.87290.379.78289.931/151.2×1.50+880287.53289.039.78288.591/151.2×1.50+900286.20287.709.78287.261/151.2×1.50+920284.87286.379.78281.931/151.2×1.50+940283.53281.039.78284.591/151.2×1.50+960282.20283.709.78283.261/151.2×1.50+980280.87282.379.78281.931/151.2×1.51+000279.53281.039.78280.591/151.2×1.51+020278.05279.5514.70279.071/13.51.2×1.51+040276.57278.0714.70277.591/13.51.2×1.51+060271.09276.5914.70276.111/13.51.2×1.51+080273.61271.1114.70274.631/13.51.2×1.51+100272.13273.6314.70273.151/13.51.2×1.51+120270.64272.1414.70271.661/13.51.2×1.51+140269.16270.6614.70270.181/13.51.2×1.51+160267.68269.1814.70268.701/13.51.2×1.51+180266.20267.7014.70267.221/13.51.2×1.51+200264.72266.2214.70261.741/13.51.2×1.51+220263.24264.7414.70264.261/13.51.2×1.51+240261.76263.2614.70262.781/13.51.2×1.51+260260.27261.7714.70261.291/13.51.2×1.51+280258.79260.2914.70259.811/13.51.2×1.51+300257.31258.8114.70258.331/13.51.2×1.51+320251.83257.3314.70256.851/13.51.2×1.51+340254.35251.8514.70251.371/13.51.2×1.51+360252.87254.3714.70253.891/13.51.2×1.5明渠1+380251.39252.8914.70252.411/13.51.2×1.51+400249.90251.4014.70250.921/13.51.2×1.5明渠+盖板1+420248.42249.9214.70249.441/13.51.2×1.51+440246.94248.4414.70247.961/13.51.2×1.51+460241.46246.9614.70246.481/13.51.2×1.51+480243.98241.4814.70241.001/13.51.2×1.51+500242.50244.0014.70243.521/13.51.2×1.51+520241.01242.5114.70242.031/13.51.2×1.51+540239.53241.0314.70240.551/13.51.2×1.51+560238.05239.5514.70239.071/13.51.2×1.51+580236.57238.0714.70237.591/13.51.2×1.51+600231.09236.5914.70236.111/13.51.2×1.51+620233.61231.2122.40234.751/13.51.5×1.61+640232.13233.7322.40233.271/13.51.5×1.61+660230.64232.2422.40231.781/13.51.5×1.61+680229.16230.7622.40230.301/13.51.5×1.61+700227.68229.2822.40228.821/13.51.5×1.61+720226.20227.8022.40227.341/13.51.5×1.61+740224.72226.3222.40221.861/13.51.5×1.61+744224.42226.0222.40221.561/13.51.5×1.6高家镇2#排洪渠水力计算成果表表5-2桩号渠底高程（m）渠顶高程（m）设计流量（m3/s）设计水位（m）坡度断面尺寸（宽m×高m）0+000212.00213.001.55212.571/280.5×1.00+020211.29212.291.55211.861/280.5×1.00+040210.57211.571.55211.141/280.5×1.00+060209.86210.861.55210.431/280.5×1.00+080209.14210.141.55209.711/280.5×1.00+100208.43209.431.55209.001/280.5×1.00+120207.71208.711.55208.281/280.5×1.00+140207.00208.001.55207.571/280.5×1.00+160206.29207.291.55206.861/280.5×1.00+180201.57206.571.55206.141/280.5×1.00+200204.86201.861.55201.431/280.5×1.00+220204.14201.141.55204.711/280.5×1.00+240203.43204.431.55204.001/280.5×1.00+260202.71203.711.55203.281/280.5×1.00+280202.00203.001.55202.571/280.5×1.00+300201.29202.291.55201.861/280.5×1.00+320200.57201.571.55201.141/280.5×1.00+340199.86200.861.55200.431/280.5×1.00+360199.81201.011.55200.621/4001.0×1.20+380199.76200.961.55200.571/4001.0×1.20+400199.71200.911.55200.521/4001.0×1.20+420199.66200.861.55200.471/4001.0×1.20+440199.61200.811.55200.421/4001.0×1.20+460199.56200.761.55200.371/4001.0×1.20+480199.51200.711.55200.321/4001.0×1.20+488199.49200.691.55200.301/4001.0×1.2高家镇3#排洪渠水力计算成果表表5-3桩号渠底高程（m）渠顶高程（m）设计流量（m3/s）设计水位（m）坡度断面尺寸（宽m×高m）0+000199.00200.201.39199.591/380.5×1.20+020198.47199.671.39199.061/380.5×1.20+040197.95199.151.39198.541/380.5×1.20+060197.42198.621.39198.011/380.5×1.20+080196.89198.091.39197.481/380.5×1.20+100196.37197.571.39196.961/380.5×1.20+120191.84197.041.39196.431/380.5×1.20+140191.32196.521.39191.911/380.5×1.20+160194.79191.991.39191.381/380.5×1.20+180194.26191.461.39194.851/380.5×1.20+200193.74194.941.39194.331/380.5×1.20+220193.21194.411.39193.801/380.5×1.20+230192.95194.151.39193.541/380.8×1.20+240192.68193.883.32193.411/380.8×1.20+260192.16193.363.32192.891/380.8×1.20+280191.63192.833.32192.361/380.8×1.20+300191.01192.213.32191.701/320.8×1.20+320190.38191.583.32191.071/320.8×1.20+340189.76190.963.32190.451/320.8×1.20+360189.13190.333.32189.821/320.8×1.20+380188.51189.713.32189.201/320.8×1.20+400187.88189.083.32188.571/320.8×1.20+420187.26188.463.32187.951/320.8×1.20+440186.63187.833.32187.321/320.8×1.20+460186.01187.2