本文關(guān)鍵詞：梁式橋結(jié)構(gòu)頂升關(guān)鍵技術(shù)研究　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 連續(xù)梁橋 同步頂升 系統(tǒng)構(gòu)成 過程監(jiān)控

【摘要】：近年來橋梁頂升改造工程越來越多。橋梁頂升是一項(xiàng)技術(shù)要求高、設(shè)計(jì)施工難度大、過程控制難度大的新興施工技術(shù)，開展梁式橋頂升關(guān)鍵技術(shù)研究對保障施工過程安全及質(zhì)量具有重要意義。 本文針對連續(xù)梁橋，首先提出適宜的同步頂升系統(tǒng)及流程，并以成都市二環(huán)路交大立交橋頂升工程作為依托工程，主要從頂升系統(tǒng)構(gòu)成中鋼支撐托架系統(tǒng)的選用、限位系統(tǒng)設(shè)計(jì)、頂升液壓系統(tǒng)的選擇以及頂升施工流程等幾個(gè)方面來進(jìn)行研究；然后根據(jù)頂升支撐結(jié)構(gòu)特點(diǎn)，并通過有限元軟件驗(yàn)算擬定出適用于依托工程的支架系統(tǒng)，主要從支架系統(tǒng)的安全性、合理性和經(jīng)濟(jì)性幾方面進(jìn)行對比分析，提出適用于多跨連續(xù)梁橋頂升施工標(biāo)準(zhǔn)化的支撐體系；其次對依托工程的上部結(jié)構(gòu)進(jìn)行仿真模擬分析，，主要對梁體處于正常頂升狀態(tài)、超頂現(xiàn)象和千斤頂失效狀態(tài)的受力進(jìn)行分析；然后對交大立交橋頂升過程監(jiān)控的內(nèi)容設(shè)計(jì)和測點(diǎn)布置進(jìn)行分析，通過對其頂升過程中的應(yīng)力、位移、裂縫和穩(wěn)定系數(shù)等關(guān)鍵監(jiān)控項(xiàng)的實(shí)測數(shù)據(jù)進(jìn)行分析研究；最后根據(jù)國家規(guī)范驗(yàn)證依托工程在本次無損頂升改造施工過程中的可行性和可靠性。 通過分析結(jié)果表明：本文提出的連續(xù)梁橋同步頂升系統(tǒng)及流程在依托工程中的應(yīng)用情況良好。有限元軟件分析結(jié)果表明：文中提出的八個(gè)鋼管支撐對稱布置方式比六個(gè)鋼管鋼支撐對稱布置方式的更合理，頂升過程中不會產(chǎn)生附加內(nèi)力而影響結(jié)構(gòu)安全；在頂升過程梁體出現(xiàn)整體位移誤差和傾斜位移誤差時(shí)，中間墩比邊墩因偏差產(chǎn)生的附加內(nèi)力和拉、壓應(yīng)力都較大,因此在頂升過程中對中間墩進(jìn)行嚴(yán)格控制，重點(diǎn)監(jiān)測和調(diào)整。工程過程監(jiān)控及應(yīng)用情況表明：整個(gè)頂升過程中梁體變形和頂升高度誤差在預(yù)警值及限值之內(nèi)，符合要求；梁體和鋼管支撐頂升過程中的受力情況良好，未出現(xiàn)任何病害，承臺無異常沉降，本次頂升的施工質(zhì)量、安全和工期都達(dá)到了預(yù)期效果。本文根據(jù)連續(xù)梁橋頂升的關(guān)鍵技術(shù)做出了比較全面可靠的分析研究，為今后梁式橋結(jié)構(gòu)的頂升施工工程提供了設(shè)計(jì)和施工依據(jù)，也為今后編制頂升改造施工規(guī)范提供了實(shí)例依據(jù)。
[Abstract]:In recent years, there are more and more bridge uplift reconstruction projects. Bridge jacking is a new construction technology with high technical requirements, great difficulty in design and construction, and difficulty in process control. It is of great significance to carry out the research on the key technology of beam bridge uplift to ensure the safety and quality of the construction process. Aiming at the continuous beam bridge, this paper first puts forward the suitable synchronous lifting system and flow, and relies on the lifting project of the second Ring Road overpass in Chengdu. This paper mainly studies the selection of support bracket system, the design of limit system, the choice of hydraulic system and the construction process of lifting system. Then according to the characteristics of the jacking support structure and through the finite element software check calculation to draw up the support system for the support project, mainly from the security, rationality and economic aspects of the comparative analysis of the support system. A support system suitable for the standardization of lifting construction of multi-span continuous beam bridges is proposed. Secondly, the superstructure of the supporting engineering is simulated and analyzed, which mainly analyzes the force of the beam body in the normal lifting state, the phenomenon of overtopping and the failure state of the Jack. Then it analyzes the content design and measuring point arrangement of the monitoring of the uplift process of Jiao Tong University overpass, and analyzes and studies the measured data of key monitoring items such as stress, displacement, crack and stability coefficient in the process of uplift. Finally, the feasibility and reliability of the supporting project in the construction process of the non-destructive uplift retrofit are verified according to the national code. The results of analysis show that the synchronous lifting system and flow of continuous beam bridge presented in this paper are well applied in the supporting engineering. The finite element software analysis results show that:. In this paper, the symmetrical arrangement of eight steel tube braces is more reasonable than that of six steel tubes. The safety of the structure will not be affected by the additional internal force in the process of jacking. When there are integral displacement error and inclined displacement error in the uplift process, the additional internal force and tension and compressive stress caused by the deviation of the middle pier than the side pier are larger, so the middle pier is strictly controlled during the uplift process. The monitoring and application of engineering process show that the errors of beam deformation and elevation are within the early warning value and limit value, which accord with the requirements; Beam and steel pipe support during the uplift process of the force is good, there is no disease, no abnormal settlement of the cap, the construction quality of this uplift. According to the key technology of continuous beam bridge jacking, this paper makes a more comprehensive and reliable analysis and study, which provides the design and construction basis for the construction of beam bridge structure jacking in the future. It also provides an example basis for compiling the construction code of uplift reconstruction in the future.
【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】：2014
【分類號】：U445.4

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