本文關鍵詞： 橋梁工程 斜拉橋 單索面 牽索掛籃 設計 施工　出處：《鄭州大學》2014年碩士論文　論文類型：學位論文

【摘要】：斜拉橋是一種組合式橋梁，，它具有梁體受壓、斜拉支撐受拉的特點。它發(fā)揮了拉索抗拉能力強，混凝土梁（或鋼箱梁）抗壓能力大的特點，因其跨度大，整體剛度大，在大跨徑橋梁中得到了較好的應用。斜拉橋便于采用懸臂法施工，但由于拉索與主梁和索塔連接構造復雜，且三者之間的內力和變形相互關聯(lián)性十分密切，因而施工難度高。為了保證橋梁施工過程及最終成橋線形和內力符合設計要求，須在施工前撰寫完善的施工步驟和監(jiān)控方案。 本文以肇慶市閱江大橋為研究對象，對單索面斜拉橋施工中的關鍵技術進行了分析研究，完成了以下工作并得出重要結論。 （1）根據(jù)閱江大橋的特點，采用掛籃施工分段澆筑主梁混凝土方法。利用有限元軟件ANSYS對主梁中央單索面掛籃在四種施工工況下進行了受力分析和變形計算，得出各工況下主要構件的應力及變形結果，根據(jù)計算結果設計掛籃截面，并選擇合適的鋼材。 （2）根據(jù)閱江大橋的結構特點及現(xiàn)場情況，掛籃安裝采用整體提升方法，并制定了詳細的操作步驟。掛籃安裝后進行了靜載試驗，試驗以掛籃澆筑最重節(jié)段混凝土荷載的1.10倍作為最大荷載，采用堆麻袋裝砂的加載方式，輔以腹板位置加堆鋼筋來模擬主梁混凝土澆注全過程，據(jù)此得出掛籃的非彈性變形和彈性變形，前者已經消除，后者通過預抬標高來予以調整。 （3）本文詳細介紹了主梁及斜拉索的施工工藝及流程，詳細闡述了牽索掛籃的特點、牽索掛籃施工工藝流程、掛籃行走與定位、模板工程、鋼筋預應力工程、預埋件施工、混凝土工程、斜拉索施等施工工藝。 通過對以上內容的研究與分析，得出如下重要結論： （1）箱梁兩側斜腹板及翼緣板下方采用桁架式支承結構，既滿足了強度和剛度需要，同時減少了整個掛籃的下部結構重量，使用起來更加輕便；同時兩側桁架與主梁結構采用銷軸連接，方便了現(xiàn)場拆裝。 （2）前支點牽索結構為雙向可調節(jié)系統(tǒng)，有更強的通用性�？梢赃m應空間三個方向均有一定傾斜度的斜拉索的牽引和張拉。 （3）本掛籃前、后支點及錨桿處均采用40CrMo材質的拉桿，避免了采用精軋螺紋鋼容易發(fā)生脆斷破壞的風險。
[Abstract]:The cable-stayed bridge is a kind of composite bridge, which has the characteristics of the beam body being compressed and the cable-stayed support subjected to tension. It exerts the characteristics of strong tensile ability of the cable and great compressive capacity of the concrete beam (or steel box girder), because of its large span and large overall stiffness. The cable-stayed bridge is easy to be constructed by cantilever method, but because of the complex structure of cable, main girder and cable tower, the internal force and deformation of the three bridges are closely related. Therefore, the construction is very difficult. In order to ensure that the bridge construction process and the final completion of the bridge alignment and internal force meet the design requirements, it is necessary to write the perfect construction steps and monitoring scheme before construction. Taking Huijiang Bridge in Zhaoqing City as the research object, this paper analyzes and studies the key technology in the construction of single cable plane cable-stayed bridge, accomplishes the following work and draws important conclusions. 1) according to the characteristics of Huijiang Bridge, the concrete construction method of main girder is adopted in the construction of hanging basket. The stress analysis and deformation calculation of single cable surface hanging basket in the center of main girder under four construction conditions are carried out by using finite element software ANSYS. The results of stress and deformation of the main components under various working conditions are obtained. According to the calculation results, the section of the hanging basket is designed, and the appropriate steel is selected. 2) according to the structural characteristics and site conditions of Yujiang Bridge, the hoisting method is adopted and the detailed operation steps are worked out. The static load test is carried out after the installation of the hanging basket. The maximum load is 1.10 times of the heaviest section concrete load, the loading mode of sand-filled sack is adopted, and the whole process of pouring main beam concrete is simulated with web plate position and pile reinforcement. The inelastic deformation and elastic deformation of the hanging basket are obtained, the former has been eliminated, and the latter is adjusted by raising the elevation. This paper introduces the construction technology and flow of main beam and stay cable in detail, expounds in detail the characteristics of pulling cable hanging basket, the construction process flow, walking and positioning of hanging basket, formwork engineering, reinforcement prestressing force engineering, construction of embedded parts, etc. Concrete engineering, cable-stayed cable construction technology. Through the research and analysis of the above contents, the following important conclusions are drawn:. 1) the truss supporting structure is adopted under the inclined web and flange plate of both sides of the box girder, which not only meets the need of strength and stiffness, but also reduces the weight of the lower structure of the whole hanging basket and is more convenient to use. At the same time, both sides of the truss and the main beam structure are connected by pin shaft, which facilitates the field disassembly and assembly. The structure of the front fulcrum is a bidirectional adjustable system, which is more versatile and can adapt to the traction and tensioning of cables with certain inclination in all three directions of space. 3) in front of the hanging basket, 40CrMo pull rod is used at the rear fulcrum and anchor, which avoids the risk of brittle fracture of finish rolled rebar.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.4;U448.27

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