【摘要】：鋼管混凝土系桿拱橋施工監(jiān)測與控制是橋梁施工技術(shù)的重要組成部分，其任務(wù)是對鋼管混凝土拱橋施工過程進行預(yù)測和控制，確保橋梁在建設(shè)過程中結(jié)構(gòu)處于安全與穩(wěn)定狀態(tài)，應(yīng)力和變形始終處于安全范圍內(nèi)，以便成橋后符合設(shè)計要求。本文以蘭新二線跨烏魯木齊河1-128m大跨度鋼管混凝土系桿拱橋為工程背景，建立施工監(jiān)測控制體系，對施工控制方法、拱肋拼裝技術(shù)、施工過程穩(wěn)定性、鋼管混凝土灌注優(yōu)化、索力測試等展開研究。 首先，，回顧了鋼管混凝土及鋼棍混凝土拱橋的發(fā)展和研究現(xiàn)狀，介紹了施工控制的主要內(nèi)容和控制方法，以施工階段應(yīng)力、變形、穩(wěn)定性為控制目標，建立了適合該橋的施工控制體系。 其次，采用軟件MIDAS/CIVIL建立了考慮施工過程的有限元模型，對主要施工階段結(jié)構(gòu)應(yīng)力、變形、穩(wěn)定性進行了理論分析，預(yù)測了各施工階段結(jié)構(gòu)的變化規(guī)律，得出了主要施工階段結(jié)構(gòu)的穩(wěn)定性系數(shù)和失穩(wěn)模態(tài)。利用該模型，對拱肋混凝土不同灌注方案進行了力學(xué)分析。 再次，以動態(tài)施工控制體系為指導(dǎo)，結(jié)合現(xiàn)場實測數(shù)據(jù)，對施工過程嚴格進行“雙控”，對實測值和理論值進行比較，分析造成差異的原因，在下一個施工階段予以考慮或改進，使結(jié)構(gòu)狀態(tài)沿著預(yù)定的軌道進行下去，直到成橋后結(jié)構(gòu)各狀態(tài)達到設(shè)計既定目標。通過有限元模型對索力優(yōu)化計算的基礎(chǔ)上，采用頻率法對索力進行了測試，完成了初張拉，隨后經(jīng)過第一次調(diào)索，索力達到了設(shè)計要求。 最后，針對烏魯木齊河大橋拱肋拼裝施工方法，介紹了施工工藝流程、安裝順序、設(shè)備選擇和支架的拆除順序，對鋼管支架的強度、剛度和穩(wěn)定性進行了計算。給出了每段拱肋的立模標高，并在架設(shè)過程中不斷糾偏調(diào)整，使拱肋順利合攏。
[Abstract]:The construction monitoring and control of concrete-filled steel tubular tied arch bridge is an important part of bridge construction technology. Its task is to predict and control the construction process of concrete-filled steel tube arch bridge to ensure that the structure of the bridge is in a safe and stable state during the construction process. Stress and deformation are always in the safe range to meet the design requirements after completion of the bridge. In this paper, the construction monitoring and control system is established based on the long span steel tube concrete tied arch bridge of Urumqi River 1-128m across Urumqi River. The construction control method, arch ribbed assembly technology, construction process stability, and the optimization of concrete-filled steel tube (CFST) pouring are established in this paper. The research of cable force test is carried out. Firstly, the development and research status of concrete-filled steel tube (CFST) and steel bar concrete arch bridges are reviewed, and the main contents and control methods of construction control are introduced. The control objectives are stress, deformation and stability in construction stage. The construction control system suitable for the bridge is established. Secondly, the finite element model considering the construction process is established by using the software MIDAS/CIVIL. The stress, deformation and stability of the structure in the main construction stage are theoretically analyzed, and the variation law of the structure in each construction stage is predicted. The stability coefficient and instability mode of the main construction stage are obtained. Using this model, the mechanical analysis of different pouring schemes of arch rib concrete is carried out. Thirdly, under the guidance of the dynamic construction control system, combining with the field measured data, the construction process is strictly controlled by "double control", the measured value and the theoretical value are compared, and the reasons for the difference are analyzed. In the next stage of construction, the state of the structure should be considered or improved so that the state of the structure goes on along the predetermined track until the state of the structure after the completion of the bridge reaches the target of the design. On the basis of the optimization calculation of cable force by finite element model, the cable force is tested by frequency method, and the initial tension is completed. After the first cable adjustment, the cable force meets the design requirements. Finally, aiming at the construction method of arch rib assembly of Urumqi River Bridge, this paper introduces the construction process, installation sequence, equipment selection and removal order of support, and calculates the strength, stiffness and stability of steel pipe support. The elevation of the vertical formwork of each arch rib is given, and the rectifying adjustment is made in the course of erection to make the arch rib close smoothly.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.4;U448.225

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