【正文】 。下部結(jié)構(gòu)采用鉆孔灌注樁基礎(chǔ)，直徑為Φ ，采用輕型橋臺。橋全寬為 。 比選方案 從總體初選、環(huán)境協(xié)調(diào)、技術(shù)先進(jìn)性、施工可能、景觀要 求、技術(shù)經(jīng)濟(jì)等多方面考慮后，選出以下三個(gè)圖式來編制橋型比較方案。 E：主橋?yàn)楠?dú)塔不等跨斜拉橋，跨徑組合為 110+140m。 C：主橋?yàn)?170m的懸索橋，引橋?yàn)?35m 標(biāo)準(zhǔn)跨簡支梁，跨徑組合為 35+170+35m。 2021屆土木工程（橋梁）專業(yè)畢業(yè)設(shè)計(jì) 3 第 2 章 方案 比選 方案初選 A：主橋?yàn)榱鐦?biāo)準(zhǔn)跨簡支梁，跨徑組合為 6 40m。 地面線：見圖 。 地形地貌：橋址區(qū)地形起伏 不大 ， 河床 呈 較 對稱的 底部平緩的槽型 ， 左岸從上到下分別為 12m的砂卵礫石層、 36m 的礫碎（卵）石夾粉砂土層、 12m灰綠色的顯晶質(zhì)輝綠巖、下為灰白粗?；◢弾r；右岸 從上到下分別為 14m的砂卵礫石層、 36m的礫碎（卵）石夾粉砂土層、 7m灰綠色的顯晶質(zhì)輝綠巖、下為灰白粗?；◢弾r。 橋面橫坡：雙向 2%。 關(guān)鍵詞 ： 預(yù)應(yīng)力混凝土 ， 連續(xù)梁橋 ， 懸臂澆筑法 黃磊：石棉水電站大橋設(shè)計(jì) II ABSTRACT Continuous girder bridges of prestressed concrete generally use variable crosssection girders. Continuous girder has much more spanning capacity, a little difficulty in construction, easy maintenance, fortable, low cost, short construction period. In the design of longspan prestressed concrete bridge, this bridge is preferred. The bridge is a designing of the typical three span (66+120+66m) continuous box girder crosssection and single box single room of the prestressed concrete, crosssection and single box single room. Sections of continuous girder bridge are mainly controlled checking the fulcrum place、 the cross section、 a quarter of cross section， divided into two lanes of continuous girder bridge. Construction of the main beam uses a method of the cantilever construction. According to the unit of this bridge, there are 19 construction phases in all. In this article the structure size is arranged, and then prestressed cables are arranged, and we estimated the prestressed loss and structure calculation of prestressed concrete structures, At last the calculation and reinforcement are sure in driving plate, and we determined in the construction methods of engineering construction deployment, and attentions are also made specific requirements in construction. Keywords: Prestressed concrete, Continuous girder bridge, The cantilever construction method 2021屆土木工程（橋梁）專業(yè)畢業(yè)設(shè)計(jì) 1 第 1 章 基本資料 基本資料 橋面凈寬： +2 ；橋面全寬： 。 本文 進(jìn)行了結(jié)構(gòu)尺寸的擬定，然后 預(yù)應(yīng)力鋼絞線布置 及其預(yù)應(yīng)力損失的估算，對全預(yù)應(yīng)力混泥土構(gòu)件結(jié)構(gòu)驗(yàn)算。主梁施工采用懸臂澆筑法施工。 本文 是 一座典型的三跨 (66+120+66m)變截面預(yù)應(yīng)力混凝土 單 箱 單室連續(xù)箱梁橋 的設(shè)計(jì)。2021屆土木工程（ 橋梁）專業(yè)畢業(yè)設(shè)計(jì) 目 錄 摘 要 ....................................................................................................................................... I ABSTRACT..............................................................................................................................II 第 1 章 基 本資料 .................................................................................................................... 1 基本資料 ................................................................................................................... 1 設(shè)計(jì)依據(jù) ................................................................................................................... 1 第 2 章 方案比選 .................................................................................................................... 3 方案初選 ................................................................................................................... 3 比選方案 ................................................................................................................... 3 第一方案 — 獨(dú)塔不等跨斜拉橋 .................................................................... 3 第二方案 — 飛燕式鋼管混泥土拱橋 ............................................................ 4 第三方案 — 預(yù)應(yīng)力混泥土連續(xù)梁橋 ............................................................ 6 各方案的技術(shù)經(jīng)濟(jì)比較 ........................................................................................... 7 推薦橋型方案 ........................................................................................................... 8 第 3 章 結(jié)構(gòu)計(jì)算 .................................................................................................................... 9 設(shè)計(jì)資料 ................................................................................................................... 9 結(jié)構(gòu)尺寸擬 定 ......................................................................................................... 10 立面布置 ...................................................................................................... 10 上部結(jié)構(gòu) ...................................................................................................... 10 下部結(jié)構(gòu) ...................................................................................................... 11 鋼筋信息 ...................................................................................................... 11 其他 .............................................................................................................. 11 Midas 電算 .............................................................................................................. 11 橋面系單元劃分 .......................................................................................... 12 非橋面系單元劃分 ...................................................................................... 12 單元劃分圖 .................................................................................................. 12 主要施工階段劃分 ...................................................................................... 12 內(nèi)力圖和內(nèi)力組合 ................................................................................................. 13 黃磊：石棉水電站大橋設(shè)計(jì) 內(nèi)力圖 ...........................................................................................................13 主 梁控制截面 ...............................................................................................13 最不利荷載組合 ...........................................................................................14 預(yù)應(yīng)力鋼束估算 ......................................................................................................14 估筋原則 .....................