本文選題：深水沉井基礎(chǔ)　切入點(diǎn)：沉井浮運(yùn)　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：隨著交通事業(yè)的日益發(fā)展,需要修建寬廣的跨越江河湖海的深水大跨橋梁,而作為大跨深水橋梁經(jīng)常使用的主要大型基礎(chǔ)結(jié)構(gòu)形式之一的沉井基礎(chǔ),具有非常廣泛的應(yīng)用前景。目前,隨著橋梁跨度的發(fā)展,深水沉井基礎(chǔ)趨于大型化,其結(jié)構(gòu)構(gòu)造和工藝技術(shù)面臨日益復(fù)雜的問(wèn)題,在我國(guó)更有許多橋梁沉井尺度達(dá)到創(chuàng)世界紀(jì)錄的空前水平,缺少可借鑒成熟經(jīng)驗(yàn),需要結(jié)合工程實(shí)際項(xiàng)目展開(kāi)特大型深水沉井工藝技術(shù)研究。鑒于此,本文依托建設(shè)中的滬通長(zhǎng)江大橋主塔沉井基礎(chǔ)工程,對(duì)特大型深水沉井關(guān)鍵工藝技術(shù)展開(kāi)研究。在總結(jié)橋梁大型沉井技術(shù)基礎(chǔ)上,依托工程實(shí)際,主要研究了以下問(wèn)題:1、研究了沉井浮運(yùn)、下沉定位系統(tǒng)、沉井監(jiān)控系統(tǒng)。同時(shí)探討了在不同的水流速度、風(fēng)速、不同的吃水深度等工況下沉井浮運(yùn)時(shí)的水流阻力及空氣阻力的情況。進(jìn)行了對(duì)"鋼錨樁+重力錨"的半剛性體系的計(jì)算分析,并且提出了許多具體的定位措施。2、通過(guò)沉井的施工全過(guò)程的監(jiān)測(cè)分析,提出了進(jìn)行沉井施工的一些技術(shù)與方法。研究表明,在沉井浮運(yùn)過(guò)程中,不能忽略沉井迎風(fēng)面的空氣阻力以及井孔內(nèi)壁面的空氣阻力,隨著沉井浮運(yùn)的速度變大,圓角矩形沉井內(nèi)壁的擋水作用發(fā)揮得比較明顯;沉井的定位需考慮河床沖刷和水流擾動(dòng)影響,而采用"鋼錨樁+重力錨"的半剛性體系可以實(shí)現(xiàn)快速準(zhǔn)確定位、操作方便;在沉井全過(guò)程的監(jiān)控系統(tǒng)中,運(yùn)用基于GPS-RTK技術(shù)的實(shí)時(shí)幾何姿態(tài)監(jiān)控系統(tǒng),可以實(shí)現(xiàn)沉井施工的姿態(tài)和安全監(jiān)測(cè)預(yù)報(bào)。
[Abstract]:With the development of transportation, it is necessary to build a wide deep water bridge across rivers, lakes and seas, and as one of the main large infrastructure forms, the caisson foundation is often used in the long span deep water bridge. At present, with the development of bridge span, the foundation of deep water caisson tends to be large, and its structural structure and technology face more and more complicated problems. In China, there are many bridges whose caisson scale has reached the unprecedented level of world record, lacking of mature experience, so it is necessary to carry out the technical research of super large deep water caisson technology in combination with practical engineering projects. Based on the main tower caisson foundation of the Hutong Yangtze River Bridge under construction, this paper studies the key technology of super large deep water caisson. On the basis of summing up the bridge large caisson technology, the paper relies on the engineering practice. This paper mainly studied the following question: 1, studied the floating, sinking positioning system, caisson monitoring system, and discussed the different flow velocity, wind speed, The flow resistance and air resistance of caisson floating under different draught conditions are analyzed. The semi-rigid system of "gravity anchor of steel anchor pile" is calculated and analyzed. Through monitoring and analyzing the whole process of caisson construction, some techniques and methods of caisson construction are put forward. The research shows that, in the process of floating operation of caisson, The air resistance of the upwind surface of the caisson and the air resistance of the inner wall of the borehole can not be ignored. With the increase of the floating velocity of the caisson, the water retaining effect of the inner wall of the circular rectangular caisson is obvious. The influence of river bed erosion and flow disturbance should be taken into account in the positioning of the caisson, and the semi-rigid system with "steel anchor pile gravity anchor" can be used to locate the caisson quickly and accurately, which is convenient to operate, and in the monitoring system of the whole process of the caisson, By using the real-time geometric attitude monitoring system based on GPS-RTK technology, the attitude and safety monitoring and prediction of caisson construction can be realized.
【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】：2017
【分類號(hào)】：U445.557

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