【摘要】：高速鐵路中的橋梁主要采用簡支箱梁結(jié)構(gòu),對(duì)于40m以上大跨度簡支箱梁橋,目前采用節(jié)段預(yù)制拼裝法施工,由于施工工藝的復(fù)雜性和對(duì)設(shè)備要求的特殊性,該技術(shù)在我國起步較晚,而且發(fā)展十分緩慢。如今我國高鐵正處于黃金發(fā)展時(shí)期,對(duì)該工藝相關(guān)技術(shù)進(jìn)行研究和總結(jié)具有很重要的現(xiàn)實(shí)意義。本文以西成客運(yùn)專線漢江特大橋?yàn)楸尘?結(jié)合國內(nèi)外最新研究成果,對(duì)施工過程中的關(guān)鍵技術(shù)進(jìn)行力學(xué)仿真分析,并提出相應(yīng)的改進(jìn)措施。節(jié)段預(yù)制拼裝施工過程中拼裝線形控制非常重要,直接影響梁體的成橋線形。文中對(duì)施工過程中影響梁體線形的主要因素進(jìn)行分析,將線形控制分為三個(gè)階段:節(jié)段預(yù)制階段、拼裝階段以及預(yù)應(yīng)力張拉階段。通過進(jìn)行三階段線形控制,以保證梁體拼裝線形滿足設(shè)計(jì)要求。移動(dòng)支架造橋機(jī)在整個(gè)拼裝施工過程中是主要承重結(jié)構(gòu),其受力和變形性能直接影響梁體的施工質(zhì)量以及拼裝線形。在施工之前對(duì)造橋機(jī)進(jìn)行預(yù)壓試驗(yàn),通過實(shí)時(shí)測量各控制截面撓曲變形和主要受力桿件的應(yīng)力,分析在施工過程中其強(qiáng)度與剛度是否滿足最大施工荷載的要求。通過在預(yù)應(yīng)力張拉完畢后對(duì)橋面線形進(jìn)行測量,得出線形控制效果良好,滿足要求。預(yù)應(yīng)力張拉之前,整個(gè)梁體重量通過吊桿多點(diǎn)支撐在移動(dòng)支架造橋機(jī)上。隨著預(yù)應(yīng)力的張拉,梁體開始逐漸承受自重,同時(shí)吊桿力減小,造橋機(jī)發(fā)生反彈。由于梁體與造橋機(jī)剛度不協(xié)調(diào),為了防止梁體在自重、預(yù)應(yīng)力和吊桿力作用下上緣產(chǎn)生過大拉應(yīng)力造成梁頂接縫處開裂,在張拉過程中要對(duì)梁體進(jìn)行受力分析,以確定是否需要在張拉過程中對(duì)懸吊系統(tǒng)進(jìn)行卸載,以減少造橋機(jī)對(duì)梁體的上托力。最后利用MIDAS Civil軟件對(duì)64m節(jié)段預(yù)制拼裝梁的收縮徐變效應(yīng)進(jìn)行分析。分析對(duì)比節(jié)段拼裝和整孔預(yù)制梁后期徐變效應(yīng),分析表明節(jié)段拼裝梁前期收縮徐變效應(yīng)較整體預(yù)制梁的小,而其后期變形較大;其次還對(duì)影響混凝土?xí)r效變形的因素分別進(jìn)行參數(shù)敏感性分析,隨著濕接縫混凝土養(yǎng)護(hù)齡期的增大或二期鋪裝過早,結(jié)構(gòu)前期徐變變形較小,后期相對(duì)較大。此外環(huán)境濕度對(duì)于結(jié)構(gòu)收縮徐變也是一個(gè)敏感的控制因素。
[Abstract]:The bridge in high-speed railway mainly adopts simply supported box girder structure. For the large span simple box girder bridge above 40 m, the section precast assembling method is used at present, because of the complexity of construction technology and the particularity of equipment requirement. This technology starts late in our country, and the development is very slow. At present, high-speed rail is in the golden development period in China. It is of great practical significance to study and summarize the related technology of this process. Based on the latest research results at home and abroad, this paper analyzes the key technologies in the construction process and puts forward the corresponding improvement measures against the background of the Hanjiang Bridge in the west of Chengcheng passenger dedicated Line. The control of assembly alignment is very important in the construction of segmental prefabricated assembly, which directly affects the bridge alignment of beam body. In this paper, the main factors affecting the beam alignment in the construction process are analyzed, and the linear control is divided into three stages: segment prefabrication stage, assembling stage and prestressing tensioning stage. The three-stage alignment control is carried out to ensure that the beam assembly meets the design requirements. The moving support bridge construction machine is the main load-bearing structure in the whole assembly construction process, and its stress and deformation performance directly affect the construction quality of the beam body and the assembly line shape. The preloading test was carried out on the bridge builder before construction. The flexural deformation of each control section and the stress of the main members were measured in real time, and the strength and stiffness of the bridge construction were analyzed whether the strength and stiffness of the bridge could meet the requirements of the maximum construction load. By measuring the line shape of the bridge deck after the prestressing tension is finished, it is concluded that the linear control effect is good and meets the requirements. Before the prestressing tension, the whole beam weight is supported on the mobile support bridge machine through the suspension pole. With the tensioning of prestress, the beam begins to bear the weight gradually, and the suspender force decreases and the bridge maker rebounds. Because the stiffness of beam body and bridge machine is not in harmony, in order to prevent the excessive tensile stress in the upper edge of beam body under the action of self-weight, prestress and suspender force, the crack at the top joint of the beam should be analyzed in the process of tensioning. To determine whether it is necessary to unload the suspension system during tensioning, so as to reduce the support force of the bridge maker to the beam. Finally, the shrinkage and creep effect of 64m precast assembly beam is analyzed by MIDAS Civil software. The results show that the early shrinkage and creep effect of segmental prefabricated beam is smaller than that of the whole prefabricated beam, but the later deformation is larger. Secondly, the parameter sensitivity analysis of the factors affecting aging deformation of concrete is carried out. With the increase of curing age of wet jointed concrete or the premature paving of the second stage, the creep deformation in the early stage of the structure is small and the later stage is relatively large. In addition, environmental humidity is also a sensitive control factor for structural shrinkage and creep.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.4

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