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1、.第一篇 總體設(shè)計(jì)說明書1. 概述重慶巫山至湖北宜昌高速公路(以下簡稱“渝宜高速”)是重慶市高速公路網(wǎng)規(guī)劃的重慶市連接湖北省的第二條高速公路大通道渝滬高速公路的一段,是長江三峽路上高速交通的重要聯(lián)絡(luò)線,也是重慶市高速公路網(wǎng)中一條連接宜昌、武漢等城市的重要通道。本項(xiàng)目的建設(shè)對(duì)于完善國家高速公路網(wǎng)、加快發(fā)展長江三峽高速公路通道,強(qiáng)化重慶經(jīng)濟(jì)輻射能力、促進(jìn)沿線優(yōu)勢資源開發(fā)和經(jīng)濟(jì)發(fā)展,帶動(dòng)革命老區(qū)人民脫貧致富具有重要意義。公路技術(shù)標(biāo)準(zhǔn)為四車道高速公路,設(shè)計(jì)時(shí)速80公里,整體式路基寬24.5米。 根據(jù)項(xiàng)目在高速公路網(wǎng)及區(qū)域路網(wǎng)中的功能和作用,結(jié)合沿線地形條件以及交通量預(yù)測,依據(jù)公路工程技術(shù)標(biāo)準(zhǔn),采用全部

2、控制出入、具有較高設(shè)計(jì)速度和完善的安全設(shè)施、服務(wù)設(shè)施、管理設(shè)施的四車道高速公路。本項(xiàng)目設(shè)計(jì)文件由第一篇(總體設(shè)計(jì))、第二篇(路線)、第三篇(路基、路面)、第四篇(橋梁、涵洞、隧道)、第五篇(環(huán)境保護(hù)與景觀設(shè)計(jì))共五部分內(nèi)容組成。2. 任務(wù)依據(jù)及測設(shè)經(jīng)過本次勘察在廣泛收集、分析利用1:20萬區(qū)域地質(zhì)報(bào)告(重慶地質(zhì)礦產(chǎn)局)、重慶巫山至湖北宜昌高速公路工程可行性研究工程地質(zhì)總說明、重慶巫山至湖北宜昌高速公路工程場地地震安全性評(píng)價(jià)報(bào)告、重慶巫山至湖北宜昌高速公路遙感工程地質(zhì)解譯報(bào)告,主要采用了地表地質(zhì)調(diào)繪的工作方法,輔以N10輕型動(dòng)力觸探、靜力觸探、麻花鉆等簡易勘探手段,了解路線區(qū)域內(nèi)的地形、地貌、地

3、層巖性、地質(zhì)構(gòu)造、水文地質(zhì)條件、不良地質(zhì)現(xiàn)象及特殊路基等,重點(diǎn)調(diào)查各種對(duì)路線影響的不良地質(zhì)和各主要構(gòu)造物工點(diǎn)的基本地質(zhì)條件及存在的主要工程地質(zhì)問題。接受任務(wù)后,有關(guān)專業(yè)技術(shù)人員開展現(xiàn)場踏勘,根據(jù)踏勘成果及院總工辦技術(shù)指導(dǎo)書要求制定工作大綱。于2008年4月17日開始野外調(diào)查工作,于2008年5月23日結(jié)束,外業(yè)工作歷時(shí)37天。本著推薦線與比較線進(jìn)行同精度比較的原則,共布置鉆孔877個(gè),初步查明了公路所定線路沿線及各重要構(gòu)筑物場地的區(qū)域水文地質(zhì)及工程地質(zhì)條件等。3. 技術(shù)標(biāo)準(zhǔn)及設(shè)計(jì)依據(jù)3.1技術(shù)標(biāo)準(zhǔn)根據(jù)重慶巫山至湖北宜昌高速公路工程可行性研究報(bào)告以及中華人民共和國行業(yè)標(biāo)準(zhǔn)公路工程技術(shù)標(biāo)準(zhǔn)(JTG

4、 B01-2003),再結(jié)合本項(xiàng)目在四川省高速公路路網(wǎng)中的功能、作用及國民經(jīng)濟(jì)和社會(huì)經(jīng)濟(jì)發(fā)展的需要,設(shè)計(jì)采用以下技術(shù)指標(biāo):公路等級(jí):四車道高速公路計(jì)算行車速度: 80公里/小時(shí)一般最小平曲線半徑: 400米不設(shè)超高的最小平曲線半徑:2500米路基設(shè)計(jì)標(biāo)高位置:整體式為中央分隔帶邊緣最大縱坡: 5%最短坡長:200米凸形豎曲線一般最小半徑: 4500米凹形豎曲線一般最小半徑: 3000米視覺所需最小凸形豎曲線半徑:12000米視覺所需最小凹形豎曲線半徑:8000米路基寬度:整體式24.5米行車道寬度: 43.75米中間帶寬度: 2.5米中央分隔帶寬度: 1.5米硬路肩寬度:整體式22.75米土路

5、肩寬度: 20.75米路面結(jié)構(gòu)類型:瀝青砼路拱橫坡:2超高方式:整體式繞中央分隔帶邊緣旋轉(zhuǎn)設(shè)計(jì)荷載:汽車-超20級(jí),掛車120橋梁全寬:整體式24.5米涵頂橫向?qū)挾龋号c路基同寬設(shè)計(jì)洪水頻率:路基及橋1/100。3.2設(shè)計(jì)依據(jù)依據(jù)的主要技術(shù)標(biāo)準(zhǔn)、規(guī)范有: (JTG B01-2003) 公路工程技術(shù)標(biāo)準(zhǔn)(JTG D20-2006) 公路路線設(shè)計(jì)規(guī)范(JTG D30-2004) 公路路基設(shè)計(jì)規(guī)范(JTJ018-97) 公路排水設(shè)計(jì)規(guī)范工程建設(shè)標(biāo)準(zhǔn)強(qiáng)制條文 公路工程部分(JTG D60-2004) 公路橋涵設(shè)計(jì)通用規(guī)范(JTJ004-89)公路工程抗震設(shè)計(jì)規(guī)范(JTG D63-2007) 公路橋涵地基

6、與基礎(chǔ)設(shè)計(jì)規(guī)范(及條文說明)(JTG/T D65-04-2007) 公路涵洞設(shè)計(jì)細(xì)則(JTG C10-2007) 公路勘測規(guī)范(JTG D50-2006) 公路瀝青路面設(shè)計(jì)規(guī)范(JTG C30-2002) 公路工程水泥混凝土路面設(shè)計(jì)規(guī)范4. 路線走向、主要控制點(diǎn)和技術(shù)指標(biāo)運(yùn)用情況4.1路線起訖點(diǎn)本項(xiàng)目起點(diǎn)在左家灣,終點(diǎn)在向家壩4.2中間控制點(diǎn)結(jié)合本項(xiàng)目地位及功能,沿線城市經(jīng)濟(jì)發(fā)展、規(guī)劃,以及工可、初步設(shè)計(jì)批復(fù)意見。4.3路線長度本項(xiàng)目經(jīng)過施工圖階段優(yōu)化調(diào)整,全線總里程為2.5公里。4.4技術(shù)指標(biāo)本路段采用高速公路技術(shù)指標(biāo),設(shè)計(jì)車速80公里/小時(shí),路基寬度為24.5米。為了提高營運(yùn)質(zhì)量,在不增加

7、較多投資的前提下,本路段平縱指標(biāo)均滿足規(guī)范規(guī)定的一般值,豎曲線半徑在有條件的地段盡量采用滿足視覺要求的豎曲線半徑,該合同段技術(shù)指標(biāo)的運(yùn)用情況見表41。表41技術(shù)指標(biāo)運(yùn)用情況表序號(hào)指標(biāo)名稱單位技術(shù)指標(biāo)采用值備注1公路等級(jí)雙向4車道高速2設(shè)計(jì)速度公里/小時(shí)803路線長度公里2.54平曲線交點(diǎn)個(gè)25平均每條邊長公里1.0046平曲線最小半徑米/處400/17平曲線占路線總長%40.508最大縱坡%2.6409最小坡長米23010凸形豎曲線最小半徑米/處4500.000/111凹形豎曲線最小半徑米/處17600.000/112豎曲線總長米937.74.13豎曲線占路線總長%37.51從技術(shù)指標(biāo)運(yùn)用的情

8、況上看,平、縱指標(biāo)與地形協(xié)調(diào)。5.沿線地形、地質(zhì)、地震、氣候、水文、不良地質(zhì)等自然地理特征5.1 地形、地貌本合同段主要位于四川盆地邊緣低山-丘陵區(qū),是山地向丘陵的過渡地帶,地形條件較復(fù)雜,屬構(gòu)造浸蝕剝蝕地貌類型,水網(wǎng)發(fā)育,呈樹枝狀分布,整個(gè)地勢從東北向西南呈倒疊瓦式漸次降低。5.2 區(qū)域地質(zhì)穩(wěn)定性評(píng)價(jià)巖層產(chǎn)狀平緩,絕大部分巖層傾角小于5度,構(gòu)造簡單。路線經(jīng)過區(qū)地形起伏不大,相對(duì)高差均小于50m。因此區(qū)內(nèi)不良地質(zhì)發(fā)育程度較低,據(jù)調(diào)查區(qū)內(nèi)無滑坡、泥石流等不良地質(zhì),主要不良地質(zhì)表現(xiàn)為軟弱地基、小型崩塌。工程區(qū)區(qū)域穩(wěn)定性較好。5.3 水文地質(zhì)條件靜風(fēng)時(shí)間約占2050%。全年有霜期甚短,一般在60天左

9、右。本合同段位于揚(yáng)子地層區(qū)四川盆地分區(qū)的北緣,出露地層僅有白堊系下統(tǒng),此外,區(qū)內(nèi)河流兩岸有第四系零星分布。先按地層順序,由新到老分述如下:(1)第四系全新統(tǒng)沖洪積層(Q4al+pl):沿區(qū)內(nèi)河流及兩岸均有不同程度分布,主要為階地及河床堆積,一般階面平坦,階坡陡峻,灰色砂質(zhì)粘土,厚約24m。(2)白堊系下統(tǒng)蒼溪組(K1c):淺灰色、灰紫色塊層狀中細(xì)粒長石砂巖砂巖。5.4 地震5.12汶川地震發(fā)生后,國家對(duì)四川、甘肅、陜西等部分地區(qū)地震動(dòng)峰值加速度區(qū)劃圖進(jìn)行了修訂,根據(jù)“四川省汶川地震災(zāi)區(qū)各市、縣、鄉(xiāng)鎮(zhèn)一般建設(shè)工程抗震設(shè)防地震動(dòng)參數(shù)一覽表”(四川省地震局 二零零八年六月),工作區(qū)路線地震動(dòng)峰值加速

10、度為0.05g,對(duì)應(yīng)地震烈度為度。工程區(qū)內(nèi),挽近期地殼運(yùn)動(dòng)以緩慢間隙性整體抬升為主,未發(fā)現(xiàn)斷裂活動(dòng),地震少而弱。5.5氣溫、降雨、日照等工程區(qū)內(nèi)地下水主要為基巖裂隙水和松散層孔隙水,局部存在基巖承壓水。地下水受大氣降水補(bǔ)給,就近向河谷或溝谷排泄,水量分布不均。測區(qū)氣候?qū)賮啛釒Ъ撅L(fēng)氣候類型,具有冬暖春早,夏熱秋涼的特點(diǎn)。年降雨量1100mm左右。常年1-2月最冷,均溫1-3,極端最低氣溫很少在零下5度,冰雪少見。3月開春,氣溫日漸升高,但間或有寒冷空氣侵入,出現(xiàn)短暫的“倒春寒”。夏季炎熱占時(shí)長,盛夏7-8月均溫26-28,酷熱高達(dá)35-40;全年降雨量的50%集中降于7-9月,降雨強(qiáng)度大,常形成

11、暴雨天氣。立秋后氣溫急降,日變化達(dá)8-9,有“一雨成秋”之說,雖然秋季降雨量不及全年的20%,且降雨強(qiáng)度小,但?!扒镉赀B綿”持續(xù)可達(dá)二十多天。風(fēng)向隨季節(jié)變化明顯,每年48月受西南季風(fēng)和副熱帶高氣壓帶的影響,盛行偏南風(fēng),1011月受北方冷空氣影響,盛行偏北風(fēng)。大風(fēng)天氣常出現(xiàn)在每年春夏、秋冬交替階段,風(fēng)速常大于15m/s。每年35月和1011月大風(fēng)天數(shù)最多。多年平均風(fēng)速1.21.5m/s,全年5.6不良地質(zhì)現(xiàn)象及特殊路基巖層產(chǎn)狀平緩,絕大部分巖層傾角小于5度,構(gòu)造簡單。路線經(jīng)過區(qū)地形起伏不大,相對(duì)高差均小于50m。因此區(qū)內(nèi)不良地質(zhì)發(fā)育程度較低,據(jù)調(diào)查區(qū)內(nèi)無滑坡、泥石流等不良地質(zhì),主要不良地質(zhì)表現(xiàn)為

12、軟弱地基、小型崩塌。6.沿線建筑材料、水等建設(shè)條件與公路建設(shè)的關(guān)系1、路面碎石料場巫山縣牛馬嶺輝長巖碎石料:料場位于重慶市巫山縣牛馬嶺一帶,為二迭系下統(tǒng)茅口組、棲霞組黑灰色輝長巖。目前此料場正在開采,為正源鐵路道碴公司所有,儲(chǔ)量豐富。根據(jù)廣元至巴中高速公路取樣試驗(yàn)結(jié)果,試驗(yàn)壓碎值11.117.8%,磨光值44.0,滿足路面上面層用料要求,但須添加抗剝落劑以提高其與瀝青的粘附性。2、砂巖片石、塊石、碎石料場巴東市茶店子鎮(zhèn)柑子坡料場:料場位于茶店子鎮(zhèn)麻柑子坡,基巖裸露,采層為厚層青灰色砂巖,巖質(zhì)較堅(jiān)硬,節(jié)理裂隙不發(fā)育,成材率高,是比較理想的圬工用材料(通過試驗(yàn),其飽和抗壓強(qiáng)度可達(dá)41.7Mpa)。

13、3、砂、卵礫石、碎石料場巴東縣碾坪鄉(xiāng):料場位于巴東縣碾坪鄉(xiāng)下南灣,目前為一大型料場,卵礫石主要成分為花崗巖、灰?guī)r及砂巖等,卵礫石破碎后可用作于瀝青中下路面層、底基層及基層;砂需篩取或抽取,日產(chǎn)量150m3。巴東縣萬流鄉(xiāng):料場位于巴中縣萬流鄉(xiāng)秦家灣,目前為一大型料場,卵礫石主要成分為花崗巖、灰?guī)r及砂巖等,卵礫石破碎后可用作于瀝青中下路面層、底基層及基層;砂需篩取或抽取,日產(chǎn)量400m3。4、水泥水泥可在巴東、巫山市場上購買。5、鋼材、木材等鋼材、木材均可在巴東、巫山市場上購買。7.路基、路面及排水7.1路基標(biāo)準(zhǔn)橫斷面采用整體式,路基寬度24.5米,路基標(biāo)準(zhǔn)橫斷面組成為行車道寬43.75米+中央分

14、隔帶寬2.0米+左側(cè)路緣帶寬20.5米+硬路肩寬22.5米+土路肩寬20.75米;路基設(shè)計(jì)標(biāo)高為路基中央分隔帶邊緣。不設(shè)超高半徑為2500米,超高漸變率滿足1/250,以路基設(shè)計(jì)高為旋轉(zhuǎn)軸。7.2路基設(shè)計(jì)填方路基邊坡坡率一般情況下采用1:1.5,當(dāng)路基邊坡高度大于10米時(shí),坡率采用變坡式,從上至下以68米為界,上邊坡率采用1:1.5,下邊坡率采用1:1.75,填方路堤邊坡根據(jù)所處地段位置分別采用植草、拱形骨架、菱形骨架混凝土預(yù)制塊防沖刷防護(hù),挖方段邊坡率根據(jù)地質(zhì)情況而定。7.3路面設(shè)計(jì)本項(xiàng)目路面結(jié)構(gòu)如下:4cm細(xì)粒式密級(jí)配瀝青混凝土上面層+6cm中粒式密級(jí)配瀝青混凝土中面層+8cm粗粒式密級(jí)配

15、瀝青混凝土下面層+28cm水泥穩(wěn)定碎石基層+30cm級(jí)配碎石底基層。7.4排水全線由截水溝、挖方急流槽、路塹邊坡平臺(tái)急流槽、路塹邊溝、路堤邊溝、填方泄水槽排除坡面及路面水,并同沿線的橋梁、涵洞形成了地面排水系統(tǒng),以保證路基的強(qiáng)度和邊坡的穩(wěn)定性,路線以縱向排水為主,經(jīng)橋涵橫向排出。7.5取、棄土方案路基取、棄土場一般選擇在路線可視范圍之外,取、棄土完成后應(yīng)進(jìn)行恢復(fù)植被或還耕等措施處理,設(shè)置必要的防護(hù)排水設(shè)施避免水土流失。7.6施工注意事項(xiàng)(1)路基開工前,應(yīng)該根據(jù)路基設(shè)計(jì)表、設(shè)計(jì)圖紙定出路基邊緣、護(hù)坡道邊緣、排水溝位置,復(fù)核用地寬度。(2)施工前對(duì)路基范圍內(nèi)已有的有機(jī)雜質(zhì)、泥潭、草叢、各類洞穴、

16、墳、水井、池塘進(jìn)行徹底清除。對(duì)于填方路基應(yīng)嚴(yán)格執(zhí)行填筑前清表碾壓要求。(3)路基填料中嚴(yán)禁使用泥炭、淤泥、強(qiáng)膨脹土、有機(jī)土及易溶鹽含量超標(biāo)的土填筑路基。路床和浸水部分的路堤,不應(yīng)直接采用粉質(zhì)土、覆蓋層等透水性及水穩(wěn)性較差的填料進(jìn)行填筑,應(yīng)合理調(diào)配土石方,采用路基挖方中的次堅(jiān)石或堅(jiān)石等水穩(wěn)性較好的填料進(jìn)行填筑。(4)路基必須分層填筑,分層壓實(shí),每層松鋪厚度不超過30cm。(5)在路基施工中應(yīng)形成路拱,并做好路基范圍內(nèi)臨時(shí)排水設(shè)施,并在路堤邊緣設(shè)臨時(shí)土壩,形成臨時(shí)集中排水,泄水槽處邊坡應(yīng)以塑料布或編織袋等加以防護(hù),避免邊坡沖溝,造成水土流失。(6)清表土方考慮為棄方,清表土可暫時(shí)存放在邊溝外緣與用

17、地界之間,作后期綠化種植使用。8.橋涵8.1橋涵設(shè)計(jì)(1)根據(jù)外業(yè)調(diào)查結(jié)果,結(jié)合當(dāng)?shù)氐匦巍⑺?、地質(zhì)、河渠和道路情況,兼顧節(jié)省造價(jià),便與施工、耐久、美觀等原則確定橋梁位置。大、中橋的橋型設(shè)計(jì)原則是盡量采用標(biāo)準(zhǔn)化、裝配化、工廠化、統(tǒng)一化的橋梁結(jié)構(gòu),以便提高施工速度、降低施工難度、控制工程造價(jià)。(2)通過調(diào)查分析結(jié)合當(dāng)?shù)匾?,做到布局合理、水流順暢,不沖不淤、橋涵基礎(chǔ)穩(wěn)定的原則來確定小橋涵位置、跨徑和結(jié)構(gòu)型式。8.2施工注意事項(xiàng)(1)橋涵施工放樣必須用導(dǎo)線點(diǎn)坐標(biāo)和水準(zhǔn)點(diǎn)高程作為基準(zhǔn),不得用橋位樁坐標(biāo)和高程或?qū)Ь€點(diǎn)高程作為基準(zhǔn)放樣。(2)橋涵服從路線走向,按路線平縱面線形布設(shè)。(3)注意橋臺(tái)與路基邊

18、坡的順適銜接,橋涵臺(tái)背回填必須密實(shí),達(dá)到有關(guān)規(guī)范對(duì)其壓實(shí)度的要求,當(dāng)需要增設(shè)或改移橋涵位置時(shí),應(yīng)對(duì)路基縱橫向排水系統(tǒng)作可行的調(diào)整和修改,保持路基排水系統(tǒng)的暢通。(4)當(dāng)中央分隔帶處需放置通信管道時(shí),應(yīng)根據(jù)相關(guān)交通工程設(shè)計(jì)圖紙預(yù)留管線孔位。9.隧道隧道總體布置原則:在滿足路線要求的前提下,充分貼近自然,與周邊環(huán)境協(xié)調(diào),盡量減少路基開挖對(duì)自然原貌的破壞。受測區(qū)地形地物制約,同時(shí)考慮隧道排水、施工和隧道兩端的接線條件,以及洞口兩線間變電所和管理所的布置情況,隧道縱坡主要由全路線結(jié)合橋隧統(tǒng)一考慮,隧道縱坡不大于3%,亦不宜小于0.3%。本路段所設(shè)隧道最大縱坡為2.467%,最小縱坡為0.686%,符合

19、設(shè)計(jì)要求。10.環(huán)境保護(hù)與景觀設(shè)計(jì)(1)生態(tài)環(huán)境。主要包括路基邊坡生態(tài)防護(hù)、中央分隔帶綠化、服務(wù)區(qū)綠化等,通過植被恢復(fù)和綠化工程,可以達(dá)到恢復(fù)生態(tài)、減少水土流失、美化環(huán)境的目的。(2)水環(huán)境。對(duì)跨越敏感水體的橋梁排水系統(tǒng)終端設(shè)計(jì)隔油沉淀池,對(duì)初期雨水進(jìn)行隔油沉淀處理,且在發(fā)生風(fēng)險(xiǎn)事故時(shí)對(duì)危險(xiǎn)物起到集中收集的作用。(3)大氣環(huán)境。通過大密度的綠化種植、合理的物種配置,可有效吸收汽車尾氣,分解有害氣體。(4)聲環(huán)境。通過對(duì)營運(yùn)期間噪聲的預(yù)測,結(jié)合環(huán)評(píng)報(bào)告中的相關(guān)措施,對(duì)沿線環(huán)境噪聲超標(biāo)路段采取聲屏障或隔聲窗的環(huán)保措施。(5)水土保持。在路基邊坡工程防護(hù)的基礎(chǔ)上采取植被恢復(fù)、生態(tài)防護(hù);棄渣場坡面種植

20、灌木和植草,平臺(tái)種植喬灌或復(fù)耕。11.其它工程本路段無渡口碼頭,其它工程主要為與高速公路相互干擾的少數(shù)公路、地方道路、鄉(xiāng)村道路、農(nóng)耕道路及各種溝、渠改移。以不破壞原有路網(wǎng)結(jié)構(gòu)、水系,不降低其既有功能為設(shè)計(jì)原則。所有改移的各種道路進(jìn)行平、縱設(shè)計(jì),盡量減少繞行長度,降低爬行坡度,使車輛通行快速、順暢。所改移的各種溝、渠設(shè)計(jì)流量確定水流斷面,同時(shí)進(jìn)行平、縱設(shè)計(jì),滿足過水要求。為確保沿途改移地方道路、鄉(xiāng)村道路、農(nóng)耕作業(yè)道路及排灌溝渠方案合理,滿足使用者的需求,除做好改移道路平、縱面設(shè)計(jì)外,并與當(dāng)?shù)厝嗣袢罕?、政府相關(guān)部門進(jìn)行溝通,交換意見。General description of design1.s

21、ummarizeBaNan freeway is the key part of freeway which connects Chengdu with Hanzhong in Shanxi through Nanjiang in Bazhong in the “Program of Sichuan Freeway Network”, the starting section of the freeway which connects Bazhong with Kunming in the “Program of the Freeway Network of the Pearl River D

22、elta Area”, and is the important way to go out to the North. When BaNan freeway is built, it will have important significance. The freeways skeleton network of Sichuan will be further improved, the north export of Sichuan province will be more smooth, the situation of Nanchongs regional sub prime tr

23、ansportation junction will be promoted, the ability of accessing of Bazhong which is a traffic node city will be enhanced,the comprehensive transportation hub in western part will be built, and the speed of supporting the poor in the old revolutionary base areas of North Sichuan will be faster.Accor

24、ding to the function and effect of projects in the freeway network and the regional road network, combining with the terrain conditions and traffic forecast by the road, and according to the engineering standards of freeway, we use four-lane freeway which fully controls access, has a higher design s

25、peed and perfect safety facilities, services facilities and management facilities.2. Technical standards and basis of designs 2.1Technical standard According to the feasibility study report of the freeway project from Bazhong to the south and the engineering standards of freeway of industry standard

26、 of the Peoples Republic (JTG B01-2003), combining with the function and effect of this project in Sichuan provinces freeway network and the needs of the national economic and needs of social and economic development, design following technological indexes.lFreeway grade: four-lane freewayllThe mini

27、mum circular curve radius: 400mlThe minimum circular without superelevation: 2500mlThe shortest length of swing line: 70mlGeneral value of the level of the minimum curve length: 400mlLimit value of the level of the minimum curves length: 140mlThe sight distance of stopping: 110mlThe elevation of roa

28、dbed design position: the edge of median striplMaximum longitudinal grade: 5%lShortest slope length: 200mlLimit value of the minimum convex vertical curve: 3000mlGeneral value of the minimum convex vertical curve: 4500mlLimit value of the minimum spill vertical curve: 2000mlGeneral value of the mini

29、mum spill vertical curve: 3000mlGeneral value of the vertical curves length: 170mlThe minimum value of vertical curves length: 70mlWidth of subgrade: 24.5mlLane width: 43.75mlMiddle belt width: 3.0mlThe central space with width: 1.5mlHard road shoulder width: 22.75mlDirt road shoulder width: 20.75ml

30、Pavement structure type: asphalt concretelLkarch cross-sectional slope: 2%lSuperelevation : rotating around the edge of the central spacelCar load: freeway-lBridge whole width: 24.5mlThe horizontal width of the culvert top: the roadbed widthlThe horizontal width of the culver top :the roadbed widthl

31、Design flood frequency: subgrade and large, in, bridges and 1/100, 1/300 of the BridgelThe frequency of design flood: subgrade and bridge: 1/100, the most important bridge: 1/3002.2The basis of design Main technical standards, specifications:Freeway engineering technical standardJTG B01-2003Freeway

32、route design standardJTG D20-2006Freeway roadbed design standardJTG D30-2004Freeway drainage design specificationJTJ018-97Engineering and construction standards mandatory provisions of freeway projects sectionFreeway bridge design general specificationJTG D60-2004Freeway projects for seismic design

33、standardJTJ004-98Freeway Bridge foundation and the basic design specification (provisions)JTG D63-2007Detailed design of freeway culvertsJTG/T D65-04-2007Freeway Survey and SpecificationJTG D50-2006Freeway asphalt pavement design standardJTG D50-2006Freeway Concrete Pavement design specificationsJTG

34、 C30-20023. Technical indexThis road adopts freeway technical index, the design speed is 80 km / h, and the roadbed width is 24.5 meter. The length of the whole road is 5975.239 meters with six line intersections and five slope points. In order to improve operational quality, under the premise witho

35、ut more investment, this roads Horizontal and Vertical indexes are to meet the general value of specification and radius of vertical curve meet the visual requirements of the vertical curve radius as far as possible in the road which meets the conditions.4. The topography, geology, earthquake, clima

36、te, hydrology, poor geological and other natural geographical features along the road4.1 Topography and GeomorphologyThe road of this project belongs to the low mountains and hilly terrain so that the condition of geography is complex. Besides, the area of the project is tectonic erosion physiognomy

37、, the water channel distributes dendritically.4.2 The evaluation of stability of the regional geology The tectonic belt of the project area fractures and does not develop and mainly folds. The movement of new tectonic movement of the project area mainly is intermittently upward movement to form the

38、river terraces and eroding planation surface. Route is located in weak earthquake area of the northwest Sichuan. The level of seismic activity in this area is relatively weak, which is characterized by medium magnitude, low frequency and sporadic distribution. According to historical records, the di

39、strict did not occur the disastrous earthquake. Regional stability of the project area is good.4.3 Hydrogeological conditionsGroundwater in the project area is mainly bedrock fissure water and pore water in loosing layer, and bedrock confined water exists in some area. Groundwater which is influence

40、d by meteoric and inflows into the nearest valley or ravine has regional misdistribution.4.4 EarthquakeRecently, the crustal movement in project area mainly is slow uplift of the whole part. And we did not find fracture activity and much and violent earthquakes. According to the “Block Plan of Chine

41、se Ground Motion Parameter” and “The Report of Seismic Safety Evaluation” published in 2001, the acceleration speed of earthquake peak in the project area is 0.05g, characteristic period of dynamic response spectrum is 0.45s and the corresponding basic earthquake intensity is degree.4.5 Temperature,

42、 rainfall, sunshine, etc.The project areas climate is subtropical monsoon climate which is warm in winter, hot in summer, cool in autumn and spring is coming to early. The regions annual rainfall is about 1100mm4.6 Adverse geological phenomena and special subgradeThis project area belonged to the hi

43、lly areas, geological structure is relatively simple, geological tectonic is not strong, the attitude of rocks is gently, the integrity of lock is good, the high and steep slopes are very rare, the longitudinal slope of gully is moderate, and the catchment area is relatively small. Therefore, in the

44、 project area the landslides, mudslides, and other typical adverse geological phenomena do not exist. The main adverse geological phenomenon in the project area is small collapse.5. Roadbed, pavement and drainage5.1 standard cross-section of roadbedThe standard cross-section of roadbed is integral.

45、The roadbeds width is 24.5 meters, and the standard cross-section of roadbed composed of carriageway which is 4 3.75 m , the central divider which is 2.0 meters , the left curbs which is 2 0.5 m, hard road shoulder which is 2 2.5 m and dirt road shoulder which is 2 0.75 m. Besides, the designed elev

46、ation of roadbed is the edge of the roads central strip. Do not take the ultra-high radius as 2500 meters, the ultra-high gradient rate as 1/250, and the designed height of roadbed as the rotation axis. The filler of roadbed is the soil gets from excavation of roadbed along the road.5.2 Pavement Des

47、ignThe structure of the pavement design of this project is the following aspects:The top layer of the road is 4cm which is fine-grained asphalt concrete, the middle layer is 6cm which is the grain type of asphalt concrete, the under layer is 8cm which is thick dense graded asphalt concrete, The stone base layer is 28cm

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