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.....................................................................................46 . 蓋梁、橋臺(tái) 施工措施 .........................................................................48 . 梁體預(yù)制 ...........................................................................................49 . 橋面施工工藝流程 ....................................................................... .....51 結(jié) 論 .........................................................................................................52 致 謝 ....................................................................................................... ...56 參考文獻(xiàn) ...................................................................................................57 2 9+2 裝配式鋼筋混凝土簡(jiǎn)支 T 型梁橋設(shè)計(jì)計(jì)算 摘 要 目前,混凝土被廣泛的使用于各種中小跨度的橋梁中,而且大量采用混凝土將是未來(lái)橋梁發(fā)展的趨勢(shì)。在確定方案時(shí),根據(jù)調(diào)研及查閱大量的資料,在此橋位上布置了裝配式鋼筋混凝土簡(jiǎn)支 T 梁橋,拱橋, T 型剛構(gòu)橋三種設(shè)計(jì)方案,根據(jù)“安全、適用、經(jīng)濟(jì)、美觀”的原則,對(duì)各種橋型的優(yōu)缺點(diǎn)進(jìn)行了比選,而裝配式鋼筋混凝土簡(jiǎn)支 T 梁橋,在此橋位上更具有競(jìng)爭(zhēng)力,反映在工程造價(jià)比較低,施工工期短,施工技術(shù)成熟,因此,最終選擇了裝配式鋼筋混凝土簡(jiǎn)支 T 梁橋 為設(shè)計(jì)方案。主梁橫向由 5 片 T 梁組成,梁高均為 ,兩片梁之間設(shè)置 4cm 寬現(xiàn)澆濕接縫。 橋梁上部結(jié)構(gòu)手算進(jìn)行主梁內(nèi)力分析。內(nèi)力計(jì)算結(jié)果包括基本組合、長(zhǎng)期組合及短期組合作用下的彎矩圖、剪力 圖、最大應(yīng)力圖。蓋梁承載能力驗(yàn)算及裂縫寬度驗(yàn)算與抗剪驗(yàn)算、墩柱承載力驗(yàn)算及裂縫寬度驗(yàn)算、樁基承載力驗(yàn)算及裂縫寬度驗(yàn)算均由 手算 計(jì)算完成 。 關(guān)鍵詞:橋梁;荷載組合;內(nèi)力;驗(yàn)算;承載能力 3 Fabricated reinforced concrete simplysupported T bridge design calculation Abstract:Nowdays ,tstressed concrete is extensively used in various kinds of bridges with medium and small span,and it well be a development trend in future to adopt the bridges of stressed concrete in a large to the give three arch bridge,T type of steel and concrete simplysupporced T bridge for to safe, function, economy, beautiful pinnciple, advantages and disadvantages of various bridges then fabricated rainforced concrete simplysupposed T girder bridged in the petitive,reflected in project cost is lower,constuction period is short,construction technology is mature .Therefore,finally choose concrete simplysupporced T bridge for design. Therefore,it is a simply supported threespan girder bridge ( 9+2) i. The bridge is straight on the plane with18 metres in length and 10 meters in bridge is a part of a highway which the design load is HighwayIlevel. The main beam is made up of 5 Tbeams that are high and the adjacent beams are linked by pouring wet joint with 4cm in width between the two beams. Substructure is made up of circular section piers with a diameter of 1 and circular section bored pouring pile foundation with a diameter of m, the pilings of foundation are embedded into the intack moderately differentiated rock with a depth of . The concrete gravity abutment is high with a type of U and supported by pile foundation. Analysis of superstructure in the bridge be done by hand. Simply supported single Tbeam is used as analysis model in the program, only one edge beam is analysed and the mid beam using the same result in analyzing on safe side. Transverse distributing coefficient can be exported by using . The calculations include bending moment diagram, shear force diagram and maximum stress under basic/longterm/shortterm load bination. According to the calculations, checking of capacity and performance of normal use of the beam have been done. Checking of capacity/crack width/shear strength of bent cap, capacity /crack width of piers and piles are done . According to the calculation results, the bridge designed in this graduation project was safe, economical and reasonable, and it is qualified for the present bridge design specifications . Keywords:Bridge。 Inner Force。 construction design 4 第一章 橋梁方案比選 1. 1 方案比選 橋梁方案比選有四項(xiàng)主要指標(biāo):安全、適用、經(jīng)濟(jì)和美觀。方案一為連續(xù)鋼構(gòu)橋,方案二為裝配式鋼筋混凝土簡(jiǎn)支 T 形梁橋,方案三為拱橋。 屬于單孔靜定結(jié)構(gòu),受力明確;適用于中小跨徑;結(jié)構(gòu)尺寸標(biāo)準(zhǔn)化。 安全性 結(jié)構(gòu)剛度大,變形小,建國(guó)初大量采用 目前國(guó)內(nèi)大量采用;安全、行車(chē)方便。 美觀性 橋型外觀較為單一 結(jié)構(gòu)美觀,整體性好 外形、結(jié)構(gòu)美觀 經(jīng)濟(jì)性 構(gòu)造復(fù)雜,工期較短 構(gòu)造簡(jiǎn) 單,施工方便,可以大量節(jié)約模板、支架,降低勞動(dòng)度,縮短工期。 方案一: ( 1) 孔徑布置 本方案橋全長(zhǎng)為 53m,孔徑布置為 13+26+13; ( 2) 上部結(jié)構(gòu) 主梁采用 T 形梁,梁高為 ,翼緣板根部厚度為 ,肋板寬為 。 ( 4) 施工順序:剛性擴(kuò)大基礎(chǔ)施工;橋臺(tái)及橋墩施工;墩頂 0 號(hào)塊的澆筑;懸臂階段的預(yù)制安裝;各橋跨間合攏段施工及相應(yīng)的施工結(jié)構(gòu)體系裝換;橋面 體系施工。 ( 3)下部結(jié)構(gòu) 兩端橋臺(tái)均為鋼筋混凝土重力式橋臺(tái),基礎(chǔ)采用鋼性擴(kuò)大基礎(chǔ),橋墩采用混凝土重力柱式墩。因此,施工難度小,節(jié)約大量模板支架,縮短施工工期,加快速度。 半立面 半縱剖面拱腳剖面拱頂剖面主拱圈側(cè)墻欄桿人行道防水層橋面鋪裝拱腹填料欄桿 人行道 伸縮縫 側(cè)墻防水層 拱腹填料 橋面鋪裝橋臺(tái)擋墻基礎(chǔ)拱腳主拱圈拱背拱頂拱軸線拱腹起拱線平面圖 圖 13 經(jīng)過(guò)以上三個(gè)比選方案的技術(shù),經(jīng)濟(jì)比較,推薦第二方案裝配式鋼筋混凝土簡(jiǎn)支 T 形梁橋作為推薦橋型方案。 設(shè)計(jì)荷載:公路Ⅱ級(jí),人群荷載 3kN/m2。 計(jì)算方法:極限狀態(tài)法。 橫斷面圖 1 2 3 4 5i=% i=%瀝青混凝土厚8cmc40混 凝土墊層29 cm 圖 14 縱斷面圖 圖 15 設(shè)計(jì)依據(jù) ( 1) 《公路橋涵設(shè)計(jì)通用規(guī)范》( JTG D60— 2022),簡(jiǎn)稱《橋規(guī)》; ( 2) 《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》( JTG D62— 2022),簡(jiǎn)稱《公預(yù)規(guī)》; ( 3) 《公路橋涵基地與基礎(chǔ)設(shè)計(jì)規(guī)范》( JTJ 024— 85),簡(jiǎn)稱《基規(guī)》。225=合計(jì) g=?gi =格面鋪裝為 20m 的瀝青混凝土面層,重力寬度為 23KN/m179。廠梁翼板重力密度為 25KN/m179。由《橋規(guī)》( JTGD602022)得,車(chē)輛荷載后輪著地長(zhǎng)度 a2 =,寬度為 ? ,則: 21 ?????? H 21 ?????? H 荷載對(duì)于懸臂根部的有效分布寬度為: la 01 ???????? 沖擊系數(shù)用 1+u=。若選用 14 鋼筋,則有效高度 0h 10 為: mdahh 0 ??????? 按《公預(yù)規(guī)》的 )2(00 xhbxfM cdd ??? )( 3 xx ?????? ?x 驗(yàn)算 mxmhjg 0 6 6 1 ?????? 按《公預(yù)規(guī)》規(guī)定 xbfAf fcdssd 39。板內(nèi)分布鋼筋用 10,間距取 25cm。? mbfAfx fcdssd )39。 0 xhxbfM fsdd ?? mkN ???????? )( 3 mkNMmkNMM dAj ?????? 承載能力滿足要求。 結(jié)構(gòu)重力集度見(jiàn)下表 21: 結(jié)構(gòu)重力集度表 22 11 主梁 m/ 1 KN??????? )】)((【 橫隔梁 邊主梁 m/ 2552 }2 {g2 KN????????? ? )()】(【 中主梁 2g ′ =22g =2=橋面輔裝層 m/3 KN???????? 】)(【 人行道和拉桿 m/4 KN??? 合計(jì) 邊主梁 g=∑