【正文】
內(nèi)蒙古大學(xué)本科畢業(yè)論文(設(shè)計(jì))學(xué)校代碼 10126 學(xué)號(hào) 0 分 類 號(hào) 密級(jí) 本科畢業(yè)論文(設(shè)計(jì))跨X河5X40m預(yù)應(yīng)力混凝土簡支箱形梁橋設(shè)計(jì)學(xué)院、系 專業(yè)名稱 年 級(jí) 學(xué)生姓名 指導(dǎo)教師 年 月 日摘要我國的橋梁無論在建設(shè)還是在技術(shù)都已經(jīng)取得了巨大的成就,在各類橋型上我國都已經(jīng)建成具有代表性的橋梁,并且在某些領(lǐng)域已經(jīng)取得世界領(lǐng)先的成就,我國的橋梁建設(shè)在某種程度上代表著世界橋梁技術(shù)發(fā)展方向。我國橋梁建設(shè)奔著“高標(biāo)準(zhǔn)、高起點(diǎn)”的目標(biāo),相信這些會(huì)將我國橋梁建設(shè)推向更高的水平。在這里針對(duì)x河的水文條件和公路設(shè)計(jì)的實(shí)際要求,根據(jù)國家相關(guān)的法律法規(guī),進(jìn)行本次設(shè)計(jì)。本次設(shè)計(jì)針對(duì)主要針對(duì)如下三方面進(jìn)行,首先是水文部分的計(jì)算,它是針對(duì)已有資料,就確定橋長、鉆孔樁的樁長、橋面標(biāo)高等方面的確定,這是基礎(chǔ)部分;然后就計(jì)算出的橋凈長,通過方案比選選擇出合適的橋梁形式和橋梁截面,由此進(jìn)入上部結(jié)構(gòu)計(jì)算,這里是本設(shè)計(jì)最為核心所在,不僅表現(xiàn)在耗時(shí)最長,更多的是表現(xiàn)在對(duì)于橋梁整體的重要,包括荷載的計(jì)算、預(yù)應(yīng)力鋼筋的布設(shè),預(yù)應(yīng)力鋼筋的預(yù)應(yīng)力損失、梁的驗(yàn)算、變形驗(yàn)算、局部錨固驗(yàn)算、橫隔梁、行車道板以及支座計(jì)算,這些都是影響橋梁使用情況的重要計(jì)算、驗(yàn)算環(huán)節(jié),良好的行車條件和優(yōu)良的橋梁品質(zhì)都由這些計(jì)算控制;最后,開始下部結(jié)構(gòu)的計(jì)算,下部結(jié)構(gòu)是將上部結(jié)構(gòu)產(chǎn)生的荷載傳遞給地基,并且抵御各種不利的外界條件的作用,這些是下部結(jié)構(gòu)的作用,這里主要體現(xiàn)出的計(jì)算集中在蓋梁、墩柱和樁基礎(chǔ)上,在這里所選取的為單排雙柱鉆孔灌注樁基礎(chǔ),計(jì)算選取的為對(duì)橋墩的計(jì)算。 橋梁是一個(gè)整體,每一部分對(duì)于橋梁的質(zhì)量都是至關(guān)重要的,切不可以掉以輕心。關(guān)鍵詞:荷載組合、預(yù)應(yīng)力、驗(yàn)算、規(guī)范 Prestressed concrete simply supported box Girder BridgeAuthor: TongLaGa Tutor: Wang ZhiYuanAbstractBridges in our country both in construction and in technology have made great achievement, on the various types of bridge are of typical bridge has been built in our country, and has the world39。s leading achievements in some areas, the bridge construction of our country to some extent represents the world bridge technology development direction. Running of the bridge construction in China with the goal of building a high standard, high starting point, believe that these will be to a higher level of bridge construction in our country. Here for x river hydrological conditions and the actual requirements of highway design, according to relevant national laws and regulations, for the design. This design for mainly for the following three aspects, first is the calculation of hydrology section, it is in view of the existing data, determination of bridge length, drilled pile of pile length, the determination of bridge deck elevation, etc, this part is the foundation。 And then calculate the net long of the bridge, through scheme parison choose the appropriate form of bridge and bridge section, entering into the upper structure calculation, here is the most core, the design not only on the longest, is more of a bridge for the overall performance is important, including load calculation, prestressed reinforced the construction of prestressed loss of prestress, beam calculation and deformation calculation, local anchorage calculation, horizontal isolation beam, driving but as well as the calculation of the usage of these are affect the bridge important calculation, checking calculation of link, the bridge of good driving conditions and good quality are controlled by these calculations。 Finally, start the calculation of bottom structure, infrastructure is to the upper structure load transfer to the foundation, and resist the role of adverse external conditions, these is a function of the lower structure, it mainly manifests the calculation on cap beam, pier column and pile foundation, the selected here for the single row, double column bored pile foundation, the calculation of the selection for the calculation of bridge piers. Bridge as a whole, each part is crucial for the quality of the bridge, cut can not be taken 。Key words: Load bination, prestressed, checking calculation and specification 目錄第一部分 水文部分計(jì)算 1 1 設(shè)計(jì)原始資料 1 1 1 4 4 6 8第二部分 上部結(jié)構(gòu)計(jì)算 9 9 9 9 9 9 10 10 16(按邊主梁計(jì)算) 16 16 17 18 18 19 23 23 27 29 29 29 30 30 30 32 32 36 37 37 42 43 49 49 由錨具變形、鋼束回縮引起的預(yù)應(yīng)力損失 49 51 由鋼束應(yīng)力松弛引起的預(yù)應(yīng)力損失 58 59 59 60 60 65 68 68 68(跨中截面) 70 71 73 74 76 82 83 83 84 90 91 92 95 95 96 98 98 98 98 99 100. 100 100 101 102 102 104 104 105 106 106 108 10配筋與承載里驗(yàn)算 1101支座計(jì)算 113 113 113 114 115第三部分 下部結(jié)構(gòu)計(jì)算 116 116 117 117 117 123 126 126 127 128 129 129 129 129 130 130 132 132 132 132 134 134 135(m法) 136 138 鉆孔樁灌注樁墩頂縱向水平位移驗(yàn)算 140 140 141第四部分 施工組織設(shè)計(jì) 142 142 142 142 142 143 146 146附 圖 148致 謝 150參考文獻(xiàn) 151 內(nèi)蒙古大學(xué)本科畢業(yè)論文(設(shè)計(jì)) 第 155頁第一部分 水文部分計(jì)算 設(shè)計(jì)原始資料 (1)橋位平面圖(2)橋位地質(zhì)縱剖面圖(3)設(shè)計(jì)流量:Qs=1641m3/s(4)設(shè)計(jì)流速:(5)河床比降:i=‰(6)汛期洪水含沙量:16㎏/ m3(7)橋位處于山前平原區(qū)。汛期多為七、八級(jí)風(fēng),風(fēng)速為17m/s,河流現(xiàn)象不嚴(yán)重,無流木和較大漂浮物,無航道和無抗震要求(8) 該河為季節(jié)性河流,洪水時(shí)波浪推進(jìn)長度為200m, 此段水深與橋位處基本相同,(9)雨季在9月份此河段位于河流下游平坦地帶,河流比降平緩,泥沙落淤,有廣闊的沖積層。河流有下移發(fā)展趨勢(shì),主流在河槽內(nèi)擺動(dòng),天然沖淤明顯。故屬于次穩(wěn)定河段。根據(jù)地質(zhì)縱剖面圖繪出河床的樁號(hào),繪制河流的縱斷面圖。(見表1—1,圖1—1)表1—1樁號(hào)51+51+51+51+51+標(biāo)高樁號(hào)51+51+51+51+51+標(biāo)高 由于該河段有人工修筑的河堤,破壞了原有的攤槽,于是根據(jù)河堤內(nèi)部的樁號(hào)及標(biāo)高計(jì)算國稅面積及睡眠寬度。(見表1—2)表12 過水面積、水面寬度計(jì)算表樁號(hào)河床標(biāo)高(m)水深(m)平均水深(m)水面寬度(m)過水面積(m2)合計(jì)51+B=88mA=51+51+51+51+309651+103551+151+2251+1751+1021粗糙系數(shù)n=,i=%圖11 X河縱斷面圖(縱坐標(biāo):3:100;橫坐標(biāo):1:500) X河段處于山前平原區(qū),屬次穩(wěn)定性河段,因兩岸存在人工修筑的河堤的約束,故采用平均單寬流量公式計(jì)算橋孔最小長度。擬采用m簡支箱型梁橋,雙柱式墩臺(tái),(1)壅水高度(因?yàn)樽钄嗔髁颗c設(shè)計(jì)流量之比小于10%)為沖刷錢橋下喊橋墩在內(nèi)的毛過水?dāng)嗝婷娣e,等于其中,p=橋下壅水高度:(2)波浪高度 該橋位上游約500米處為河灣,汛期多為七、八級(jí)風(fēng),風(fēng)速17,所以: 橋下浪高:(3)計(jì)算水位的確定本河段流水現(xiàn)象不嚴(yán)重,亦無流木和較大漂浮物,其它引起水位升高的因素均可略去不計(jì)。故,(4)橋面標(biāo)高不通航河段 建筑高度 橋面標(biāo)高 路面標(biāo)高 (1) 一般沖刷,按641公式計(jì)算汛期洪水含沙量先第一層土計(jì)算()沖深超過了第一層土,進(jìn)入粗砂含少量礫石層。沖刷位于第二層粗砂含少量礫石層上,說明沖刷最深度的位置在第二層與第三層的交界面上642簡化式,兩者之間選大值,所以取8m(2)局部沖刷V>V0,=kεkη1 (V0 V0,)()n =包爾達(dá)可夫公式=,n=1/3,兩者取大值,(3)橋下河槽最低沖刷標(biāo)高方案一:預(yù)應(yīng)力混凝土空心板橋(m)方案二:預(yù)應(yīng)力鋼筋混凝土T形簡支梁橋()方案三:預(yù)應(yīng)力混凝土箱型梁橋()從經(jīng)濟(jì)、安全、美觀、使用、技術(shù)先進(jìn)、有利于環(huán)境保護(hù)、可持續(xù)發(fā)展等原則出發(fā),對(duì)比上述三個(gè)方案,從而