【摘要】：延安至延水關(guān)高速公路清澗河河谷區(qū)路段共設(shè)主線橋梁27處、橋長8719米,乾坤灣立交E匝道橋梁4處。選擇合理的橋型方案、橋墩形式尺寸以及基礎(chǔ)形式對(duì)于確保橋梁安全、同時(shí)使橋梁造價(jià)控制在合理范圍內(nèi)顯得至關(guān)重要。本文通過收集、查閱清澗河沿線水文站的觀測資料,分析歷史洪水資料,依據(jù)數(shù)理統(tǒng)計(jì)法和流域面積比擬法,確定了清澗河的設(shè)計(jì)流量。依據(jù)《公路橋位勘測設(shè)計(jì)規(guī)范》,確定了反應(yīng)各種因素對(duì)水流阻力影響的指標(biāo)-糙率n。分析清澗河水文資料,得到各水文斷面分析成果,研究斷面垂線流速分布,綜合確定了流水壓力合力的著力點(diǎn),從而計(jì)算出單排樁柱式橋墩、多排樁柱式橋墩墩頂?shù)目雇苿偠群涂箯潉偠?以及墩頂作用水平力、彎矩時(shí)的墩頂變位和流水壓力作用時(shí)的墩頂變位。接著分析了河流對(duì)結(jié)構(gòu)的作用,包括靜水壓力、流水壓力、浮托力,明確了清澗河段橋梁作用于橋墩之設(shè)計(jì)作用組合,對(duì)半幅雙柱墩、半幅獨(dú)柱墩、全幅雙柱墩進(jìn)行了順橋向驗(yàn)算、橫橋向驗(yàn)算,確定了墩柱尺寸、配筋率,明確了各種橋墩、基礎(chǔ)形式的適用范圍。為了全面分析清澗河水流對(duì)橋梁下部結(jié)構(gòu)形式設(shè)計(jì)的影響,本文就設(shè)計(jì)流量、糙率n的確定,水流對(duì)橋梁下部結(jié)構(gòu)及基礎(chǔ)受力計(jì)算進(jìn)行了系統(tǒng)研究,建立了黃河溝壑區(qū)水中橋梁下部結(jié)構(gòu)及基礎(chǔ)設(shè)計(jì)的一般體系,并提出了相應(yīng)的技術(shù)要求,研究成果不僅為這項(xiàng)新技術(shù)在陜西省的推廣應(yīng)用提供技術(shù)保障,而且也為我國橋梁設(shè)計(jì)規(guī)范的修訂完善積累數(shù)據(jù)。
[Abstract]:There are 27 main bridges in Qingjian River Valley area of Yanan to Yanshuiguan Expressway, 8719 meters long bridge, 4 bridges in E ramp of Qiankun Bay Interchange. It is very important to choose a reasonable bridge scheme, the size of piers and the foundation form to ensure the safety of the bridge and to control the cost of the bridge within a reasonable range. Through collecting, consulting the observation data of hydrologic station along Qingjian River, analyzing the historical flood data, according to the mathematical statistics method and the basin area analogy method, the design discharge of Qingjian River is determined. According to the Specification for Highway and Bridge position Survey and Design, the roughness n., which is the index of the influence of various factors on the flow resistance, is determined. By analyzing the data of Qingjian river, the results of hydrological section analysis are obtained, the velocity distribution of vertical line of section is studied, and the point of stress of the pressure force of flowing water is determined synthetically, so as to calculate the pier of single row pile column type bridge. The pushing stiffness and bending stiffness of the piers with multi-column piles, the horizontal force acting on the pier top, the displacement of the pier top when bending moment and the displacement of the pier top under the pressure of flowing water are also discussed. Then it analyzes the effect of river on structure, including hydrostatic pressure, flowing water pressure, floating support force, and clarifies the design function combination of bridge action on bridge pier in Qingjian River reach, half double column pier, half single column pier, The full-width double-column piers are checked along the direction of the bridge and the direction of the transverse bridge. The size of the pier column the ratio of reinforcement and the applicable range of various piers and foundation forms are determined. In order to comprehensively analyze the influence of Qingjian river flow on the design of bridge substructure, this paper studies systematically the determination of design flow, roughness n, and the calculation of the force acting on the bridge understructure and foundation by water flow. The general system of the substructure and foundation design of the bridge in the Yellow River gully region is established, and the corresponding technical requirements are put forward. The research results not only provide a technical guarantee for the popularization and application of the new technology in Shaanxi Province, but also provide a technical guarantee for the application of the new technology in Shaanxi Province. It also accumulates data for the revision and perfection of bridge design code in China.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.5

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