防洪工程排洪渠施工工程布置和主要建筑物設計方案

防洪工程排洪渠施工工程布置和主要建筑物設計方案1.1工程等級和設計標準本工程的主要任務是防洪，滿足能通過設計洪水流量以保證集鎮(zhèn)安全，根據(jù)《防洪標準》GB50201-94，《城市防洪工程設計規(guī)范》GJJ50-92，《水利水電工程等級劃分及洪水標準》（SL-2000）和《防洪標準》（GB50201-94）規(guī)范的規(guī)定，工程保護范圍為一般城鎮(zhèn)的一部分，確定工程的建筑物等別為4級。根據(jù)《防洪標準》（GB50201-94）和《防洪工程設計規(guī)范》（GB50286-98）的有關規(guī)定，防洪工程等級為4級，防洪標準為10年一遇洪水。根據(jù)《建筑抗震設計規(guī)范》（GB50011-2001）和《中國地震動參數(shù)區(qū)劃圖》（GB183306-2001），工程區(qū)抗震設防烈度為Ⅵ度，根據(jù)《水工建筑物抗震設計規(guī)范》DL5073—2000的規(guī)定，本工程構筑物可不進行抗震設計與計算，但應進行抗震構造處理。1.2工程布置1.2.1工程布置的原則根據(jù)地形、地質條件和工程目的，軸線布置考慮以下原則：1）與天然河溝及公路走向基本一致；2）軸線布置力求投資最省，同時注意對道路、邊坡穩(wěn)定的影響；3）軸線布置力求平順，使水流條件較好；4）軸線布置應本著少占耕地，少拆遷房屋，有利防汛搶險和工程管理。1.2.2工程布置方案根據(jù)本防洪工程的任務和布置原則，確定軸線基本沿原自然排水線路布置，走向平順、光滑。高家鎮(zhèn)防洪工程防洪標準為10年一遇，新建排洪渠3條，其中1#排洪渠設計總流量Q=22.40m3/s，總長1744m，主要由明渠及蓋板渠道組成，起點位于高家鎮(zhèn)燒磚廠，末端接已建箱涵。1#排洪渠0+000～0+600為明渠，斷面形式為半梯形；0+600～1+744段渠道沿線大部分為已建房屋院壩，設計中考慮防洪渠在已建房屋院壩前設鋼筋砼蓋板，以方便交通，無房屋院壩位置仍為明渠。2#排洪渠設計總流量Q=1.55m3/s，總長488m，全部為明渠，起點位于高家鎮(zhèn)悼念館，末端接已建箱涵；3#排洪渠設計總流量Q=3.32m3/s，總長530m，為明渠及跌水，起點位于高家鎮(zhèn)加油站，末端接河溝，3#排洪渠明渠斷面形式為半梯形，長490m，跌坎長40m。1.3主要建筑物1.3.1主要建筑物布置高家鎮(zhèn)防洪工程防洪標準為10年一遇，新建排洪渠3條，其中1#排洪渠設計總流量Q=22.40m3/s，總長1744m，主要由明渠及蓋板渠道組成，起點位于高家鎮(zhèn)燒磚廠，末端接已建箱涵。1#排洪渠0+000～0+600為明渠，斷面形式為半梯形，其余為明渠+鋼筋砼蓋板；2#排洪渠設計總流量Q=1.55m3/s，總長488m，全部為明渠，起點位于高家鎮(zhèn)悼念館，末端接已建箱涵；3#排洪渠設計總流量Q=3.32m3/s，總長530m，為明渠及跌水，起點位于高家鎮(zhèn)加油站，末端接河溝，3#排洪渠明渠斷面形式為半梯形，長490m，跌坎長40m。排洪渠：全斷面襯砌，底板為C15砼，邊墻為M10漿砌條石，臨水面采用M10水泥砂漿抹面。1）1#排洪渠樁號0+000～0+450段，設計流量Q=4.99m3/s，坡比1/20，斷面尺寸0.8×1.0m（寬×高）；0+450～0+680段，設計流量Q=4.99m3/s，坡比1/15，斷面尺寸0.8×1.0m；0+680～1+000段，設計流量Q=14.70m3/s，坡比1/15，斷面尺寸1.2×1.3m（寬×高）；1+000～1+600段，設計流量Q=14.70m3/s，坡比1/13.5，斷面尺寸1.2×1.3m（寬×高）；1+600～1+744段，設計流量Q=22.40m3/s，坡比1/13.5,斷面尺寸1.5×1.4m（寬×高）。2）2#排洪渠樁號0+000～0+340段，設計流量Q=1.55m3/s，坡比1/28，斷面尺寸0.5×0.8m（寬×高）；0+340～0+488段，設計流量Q=1.55m3/s，坡比1/400，斷面尺寸1.0×1.0m。3）3#排洪渠樁號0+000～0+230段，設計流量Q=1.39m3/s，坡比1/38，斷面尺寸0.5×1.0m（寬×高）；0+230～0+280段，設計流量Q=3.32m3/s，坡比1/38，斷面尺寸0.8×1.0m；0+280～0+490段，設計流量Q=3.32m3/s，坡比1/32，斷面尺寸0.8×1.0m。4）跌水跌水基礎置于基巖層，底板采用C20鋼筋砼現(xiàn)澆，并設置錨桿錨固于基巖中，兩側擋墻采用M10漿砌條石擋墻，迎水側直立，背水側坡比1：0.3，跌水以下設置干砌塊石海漫。1.3.2水力計算1、排洪渠各分段設計流量成果采用第二章洪水計算成果。2、各分段起始斷面水深計算采用黃河水利職業(yè)技術學院編制的渠道水力計算程序（作者：羅全勝、張耀先）進行計算。3、水面曲線計算方法：根據(jù)以上確定的基本參數(shù)，采用新疆水利廳編制的《水力水電工程程序集》中的D-7“明渠恒定非均勻流水面曲線計算程序”進行該排洪渠的水面曲線計算。程序的計算原理及基本公式如下：（1）正常水深h0的計算按照:已知：;代入得：求ho即為求解下列方程的根：采用二分法求解，如圖1設h1〈h0〈h2令：于是若J與K同號，令h2=h；J=K若J與K異號，令h1=h2；h2=h;J=K繼續(xù)二分即令h≈(h1+h2)/2重新計算，直到∣h1-h2∣≤允許誤差為止。（2）水面曲線計算人工渠槽斷面單位能量沿程變化的微分方程其差分格式為：即：式中：其中：h1為已知，h2為欲求之水深為此，將差分方程改為下列函數(shù)表達式為求h2設試算水深h下限與h上限，用二分法求解若D、G同號，令h上限=h2；D=G若D、G異號，令h上限=h下限；h上限=h2；D=G繼續(xù)二分，直到∣h1-h2∣≤允許誤差為止4.過水斷面設計該堤防工程主要建筑物級別為4級，次要建筑物為4級。依據(jù)《城市防洪工程設計規(guī)范》（CJJ50-92)規(guī)定，安全加高值為0.4m。根據(jù)水面曲線計算成果加上安全加高取整后確定過水斷面尺寸。根據(jù)上述計算原則，集鎮(zhèn)水力計算成果見下表：高家鎮(zhèn)1#排洪渠水力計算成果表表5-1樁號渠底高程（m）渠頂高程（m）設計流量（m3/s）設計水位（m）坡度斷面尺寸（寬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+蓋板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+蓋板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+蓋板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高家鎮(zhèn)2#排洪渠水力計算成果表表5-2樁號渠底高程（m）渠頂高程（m）設計流量（m3/s）設計水位（m）坡度斷面尺寸（寬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高家鎮(zhèn)3#排洪渠水力計算成果表表5-3樁號渠底高程（m）渠頂高程（m）設計流量（m3/s）設計水位（m）坡度斷面尺寸（寬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