本文選題：橋梁　切入點(diǎn)：基礎(chǔ)　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：我國江河縱橫,海域面積大,隨著我國橋梁建設(shè)向?qū)掗熕�、外海方向發(fā)展,一座座跨江河跨湖海的特大型橋梁應(yīng)運(yùn)而生。隨著地質(zhì)條件的復(fù)雜化和水深與流速的加大,對(duì)橋梁基礎(chǔ)的修建要求越來越高,超大型深水沉井基礎(chǔ)結(jié)構(gòu)型式相繼出現(xiàn),同時(shí)給施工建造也帶來了更大的技術(shù)挑戰(zhàn)。目前國內(nèi)深水超大型沉井的施工及配套技術(shù)資料匱乏,在施工中會(huì)遇到許多新的技術(shù)難題,這就需要學(xué)習(xí)和借鑒國外已有的深水基礎(chǔ)的先進(jìn)成果和技術(shù),并結(jié)合我國實(shí)際情況和具體橋梁工程進(jìn)行認(rèn)真研究。本文依托滬通鐵路長江大橋工程的建設(shè)規(guī)模及建橋條件,對(duì)高流速深水大截面沉井的施工方案及關(guān)鍵施工技術(shù)進(jìn)行了系統(tǒng)的研究。本論文共分六個(gè)部分：第一章緒論闡述了選題的目的及內(nèi)容,評(píng)述了國內(nèi)外研究現(xiàn)狀,介紹了本文依托的工程背景。第二章對(duì)沉井的加工制作及質(zhì)量標(biāo)準(zhǔn),下河方式的比選、助浮方案及浮運(yùn)技術(shù)進(jìn)行闡述。第三章介紹了沉井定位系統(tǒng),提出了“鋼錨樁+重力式錨錠”組合定位系統(tǒng)的新型定位方案,此方案定位比較精確,操作方便。其創(chuàng)新點(diǎn)在于主錨纜繩在鋼錨樁上的作用點(diǎn)位于河床面上,鋼錨樁受力的自由懸臂長度大幅減小,從而極大地減小了鋼錨樁的規(guī)模,節(jié)省了投資。第四章對(duì)沉井下沉技術(shù)進(jìn)行研究,包括沉井下沉計(jì)算、沉井下沉施工方法、吸泥下沉和定位著床。第五章是主要研究了混凝土沉井的接高技術(shù),結(jié)合沉井的下沉,分析了混凝土沉井的接高模板配置,對(duì)混凝土沉井的澆筑順序進(jìn)行了研究。第六章是結(jié)束語,對(duì)本文所做工作進(jìn)行總結(jié),對(duì)下一步工作進(jìn)行展望。
[Abstract]:With the development of bridge construction in our country towards wide water area and offshore direction, a super large bridge across rivers and lakes emerges as the times require. With the complication of geological conditions and the increase of water depth and velocity, The construction requirements of bridge foundation are more and more high, and the super-large deep water caisson foundation structure types have appeared one after another, at the same time, it has also brought greater technical challenge to construction. At present, the construction and supporting technical data of ultra-large deep water caisson wells in China are scarce. Many new technical problems will be encountered in construction, which requires learning and drawing lessons from the advanced achievements and techniques of deep-water foundations in foreign countries. Based on the actual situation of our country and the concrete bridge project, this paper relies on the construction scale and conditions of the Yangtze River Bridge on the Shanghai-Stock Exchange Railway. The construction scheme and key construction technology of high velocity deep water and large section caisson are systematically studied. This paper is divided into six parts: the first chapter introduces the purpose and content of the topic, and reviews the current research situation at home and abroad. This paper introduces the engineering background of this paper. The second chapter describes the fabrication and quality standard of caisson, the comparison and selection of downriver way, the scheme of assisting floatation and floating transportation technology. Chapter 3 introduces the positioning system of caisson. In this paper, a new positioning scheme of "steel anchor pile gravity anchor ingot" combined positioning system is put forward. This scheme is accurate and easy to operate. The innovation of this scheme is that the main anchor cable on the steel anchor pile is located on the surface of the river bed, and the main anchor cable is located on the surface of the river bed. The free cantilever length of steel anchor pile is greatly reduced, which greatly reduces the scale of steel anchor pile and saves investment. Chapter 4th studies caisson sinking technology, including caisson sinking calculation, caisson sinking construction method, Chapter 5th mainly studies the high connection technology of concrete caisson, and analyzes the configuration of concrete caisson height form combined with sinking of caisson. The pouring sequence of concrete caisson is studied in this paper. Chapter 6th is the conclusion. The work done in this paper is summarized and the future work is prospected.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.557

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