An analysis of the structural design of highway bridges in Mountainous Areas

Considering the characteristics of highway bridges in Mountainous Areas, The design principles of bridge structure design, such as structure form, superstructure, span and substructure, are described, the optimal design scheme of bridge structure is discussed from the aspects of safety, economy and so on in this paper.

Study on the influence of skid resistance on traffic safety of highway with a high ratio of bridges and tunnels

The safety of highways with a high ratio of bridges and tunnels is related to multiple factors,for example,the skid resistance of the pavement surface.In this study,the distribution of accidents under different conditions was calculated to investigate the relationship between the road skid resistance and the incidence of traffic accidents based on the traffic accident data of the Yuxiang highway.Statistical results show that weather conditions and road alignment may affect traffic accidents.The correlation analysis method was used to study the relationship between three factors and traffic accidents.The results show that road alignment,weather conditions and road skid resistance are related to the incidence of traffic accidents.The traffic accident prediction models were established based on back propagation neural network to verify the correlation analysis results.It is confirmed that road alignment,weather conditions and road skid resistance are the factors that affect traffic accidents.

高原山区公路桥梁桥型方案设计探讨

高原山区地形地质条件复杂,不良地质往往决定桥梁桥型选择及跨径布置。结合高原山区公路桥梁的特点及选型原则,以工程实例为背景,针对高原山区水库深水区复杂环境条件下的桥梁方案,从结构特点、施工工艺、环保、后期养护和工程造价等方面进行综合分析比较,推荐采用混合式叠合梁独塔斜拉桥方案,为高原山区公路桥梁选型提供参考。

高原山区小跨径高墩柱薄壁空心墩应用技术研究

结合云南永武高速公路项目建设,对小跨径高墩柱薄壁空心墩应用技术包括特点及难点、施工工艺和应用效果进行了研究。研究结果表明,采用以翻模施工法和塔吊、定型钢模板等成套设备为主要施工支撑体系,地面工作平台、钢筋机械连接和有效控制混凝土浇筑高度相结合的成套施工技术取得了以下效果:大模板定型钢模施工有效解决了施工中容易产生偏心、扭转的现象;翻模施工法最大限度利用了主要起重设备,节约了相关的小型提升设备,与一般2m～3m翻模施工相比,可减少接茬筋50%,缩短工期20%;墩身主钢筋采用机械连接,剥肋滚轧直螺纹接头与常规帮条焊对比平均节约成本30%,每个接头节省施工时间约15min;提高了施工速度,显著降低施工成本,施工安全、质量可靠,经济效益显著。

高原山区大跨径悬索桥施工关键技术研究

我国西南地区山高谷深,多年以来复杂的地理环境和落后的交通条件限制了该地区经济的发展,所以修建高速公路对带动地域经济发展意义重大,大跨径悬索桥在高原山区适应性强。论文以云南山区大跨径悬索桥为研究对象,分析了在高原山区修建此类桥梁的难点问题并给出了相应对策,旨在为同类桥梁的修建提供借鉴。

超大跨预应力钢箱混凝土组合盖梁设计技术

高原山区的桥梁工程建设环境恶劣,工程技术要求高,钢混组合桥梁中盖梁的跨径及承受的外部荷载重量正逐步突破现有技术水平。通过加强设计或者加大施工投入以维持桥梁的正常施工与运营,不仅成本耗费巨大,更会造成资源浪费,与当前社会发展战略思想相悖。本研究依托马塘特大桥,开展超大跨预应力钢箱混凝土组合盖梁设计技术创新,提出了超大跨盖梁的设计和建造技术,为项目桥梁以及相同场景的桥梁建设提供技术支撑。