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  本文選題：大節(jié)段鋼箱梁　切入點(diǎn)：起重船　出處：《重慶交通大學(xué)》2015年碩士論文

【摘要】：《大跨變截面連續(xù)鋼箱梁整跨架設(shè)技術(shù)研究》依托位于長江入�？诘慕K省崇啟長江公路大橋工程,針對大跨度變截面連續(xù)鋼箱梁整跨架設(shè)所面臨的技術(shù)難題,其中包括總體架設(shè)方案、整體吊裝、現(xiàn)場調(diào)位、接縫連接等；采用工程調(diào)研、理論分析、數(shù)值模擬、現(xiàn)場試驗(yàn)等多種方法,系統(tǒng)地開展了以下三個方面的研究：通過兩種方案的對比分析,提出工廠整跨制作-現(xiàn)場吊裝的施工方案；開展了不同安裝順序及合攏方案的研究,提出了邊跨合攏工藝和確保結(jié)構(gòu)內(nèi)力滿足設(shè)計(jì)要求的調(diào)控措施。在進(jìn)行國內(nèi)大型起重船調(diào)研的基礎(chǔ)上,建立起重船選型系統(tǒng),擬定了滿足吊重和吊高要求的大型起重船及組合方案；進(jìn)行了大型起吊吊索具系統(tǒng)研究,提出結(jié)構(gòu)輕穎、受力合理的自平衡吊索具系統(tǒng),并建立新型吊索具的計(jì)算方法和設(shè)計(jì)原則。在分析橋區(qū)水文歷史資料和現(xiàn)場測試資料的基礎(chǔ)上,提出了起重船應(yīng)布置在上游進(jìn)行吊裝；針對架設(shè)參與船舶多、錨纜系統(tǒng)復(fù)雜的特點(diǎn),研究了合理的船舶布置方案。根據(jù)墩頂結(jié)構(gòu)形式及墩頂空間,開展了墩頂處調(diào)位系統(tǒng)研究,提出了結(jié)合永久支座的三向調(diào)位系統(tǒng),實(shí)現(xiàn)了鋼箱梁墩頂處的三向調(diào)位；展開了鋼箱梁接縫間調(diào)位系統(tǒng)研究；提出了集結(jié)構(gòu)連接和調(diào)位系統(tǒng)于一體的牛腿構(gòu)造。由于在安裝過程中各種誤差的累計(jì),會造成接縫間產(chǎn)生較大誤差,為保證接頭順利連接,提出了壓重、底板接縫處臨時對拉、支座升降等現(xiàn)場調(diào)控措施；由于待安裝梁與已安裝梁間采用栓焊連接方式,需要對栓接與焊接工序安排及連接工藝進(jìn)行研究,確保接頭質(zhì)量。本文系統(tǒng)地研究了長185m、重2690噸的鋼箱梁大節(jié)段的整體安裝調(diào)位等關(guān)鍵技術(shù)難題,研究成果為國內(nèi)近海惡劣環(huán)境下的大規(guī)模鋼箱連續(xù)梁橋建設(shè)起到示范和指導(dǎo)作用。
[Abstract]:Based on the project of Chongqi Yangtze River Highway Bridge in Jiangsu Province located at the mouth of the Yangtze River, this paper aims at the technical problems faced by the erection of long span continuous steel box girder with variable cross section. These include the overall erection scheme, integral hoisting, site adjustment, joint connection, and so on; the use of engineering research, theoretical analysis, numerical simulation, field testing and other methods, The following three aspects are systematically studied: through the comparison and analysis of the two schemes, the construction scheme of the whole span production and on-site hoisting of the factory is put forward, and the research on the different installation sequence and closure scheme is carried out. The technology of side span closure and the control measures to ensure that the internal forces of the structure meet the design requirements are put forward. Based on the investigation and investigation of large lifting ships in China, the selection system of lifting ships is established. In this paper, a large crane ship and its combination scheme which meet the requirements of lifting weight and lifting height are worked out, and the system of large lifting slings is studied, and the self-balancing sling system with light structure and reasonable force is put forward. Based on the analysis of hydrological historical data and field test data in the bridge area, it is proposed that the lifting ship should be arranged upstream for hoisting, in view of the large number of ships involved in the erection of the crane, the calculation method and the design principle of the new type of slings are established. According to the structure form of pier top and the space of pier top, the adjustment system at the top of pier is studied, and a three direction position adjusting system combined with permanent support is put forward, which is based on the complex characteristics of anchor and cable system. The three direction adjustment at the top of the steel box girder pier is realized; the research on the system of adjusting position between the joints of the steel box girder is carried out; and the corbel structure which integrates the structural connection and the alignment system is put forward. Because of the accumulative errors in the installation process, In order to ensure the smooth connection of the joint, the field control measures, such as pressing weight, temporary drawing at the bottom joint, lifting and lifting of the support, are put forward, since the connection between the beam to be installed and the installed beam is by way of bolting welding. It is necessary to study the arrangement and process of bolting and welding to ensure the quality of joint. In this paper, the key technical problems, such as the integral installation and adjustment of the large segment of steel box girder with a length of 185 m and a weight of 2690 tons, are systematically studied. The research results play a role in demonstration and guidance for the construction of large scale steel box continuous girder bridge in the harsh offshore environment.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4

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