非对称悬臂施工大跨度连续刚构桥设计研究

为降低边墩较高情况下的连续刚构桥边跨现浇段的施工难度,设计非对称悬臂施工方案以降低边跨现浇段的长度。分析非对称悬臂施工方案的孔跨布置及梁段划分,介绍该桥的预应力设计,建立考虑施工阶段的有限元模型,分析不对称悬臂施工阶段的梁体应力,并针对不对称悬臂施工梁段的预应力钢束进行不同锚固位置的对比分析,根据分析结果,选择合理的锚固位置。针对不对称悬臂施工对梁体累计位移的影响进行参数分析,根据分析结果,对施工过程中的线形控制重点提出建议。     

桥梁建设施工平台及栈桥验算分析

以某大跨径桥梁的施工栈桥平台计算为例,介绍栈桥平台计算荷载、钢管桩基础验算、施工栈桥强度及稳定性验算。经实践证明,栈桥平台设计满足实用性及相关规范要求。     

在役公铁桁架桥梁加宽改建结构安全与线形监测技术研究

以松浦大桥改建为背景,分析了桁架梁桥改建的施工监控特点,建立了老桥施工监控以结构安全控制为主,新、旧结构的适配性控制为辅的总体控制思路,研究了相应的监测与控制方法.针对支座更换施工阶段,对支座反力和主桁架动力特性进行识别,并与理论计算结果进行对比,验证与评估结构总体的技术状况.此外,开发应用了基于“互联网+”的监控数据与信息交互平台工作模式,为国内外同类桥梁的施工监控提供理论参考依据与借鉴.     

真理标准问题大讨论与党的理论建设

1978年开展的真理标准问题大讨论是中国近代史上的三次思想解放运动之一。这场讨论鲜明地批判了"两个凡是"的错误观点,提出了实践是检验真理的唯一标准,明确了对待马克思主义、毛泽东思想的正确态度。大讨论重新确立了解放思想、实事求是的思想路线,为党的十一届三中全会、改革开放奠定了正确的政治路线和组织路线,对中国特色社会主义理念体系的形成,特别是邓小平理论的提出有着深远的历史意义。继承和发扬大讨论过程中的那种大胆探索、勇于开拓的精神,对于以改革创新精神不断完善党的理论建设,推进中国特色社会主义事业前进具有重大意义。     

公路施工项目成本管理的探讨

对公路工程项目管理成本控制的原则进行分析。结合在滨德高速公路的施工项目,提出了成本控制措施。     

独柱索塔四索面斜拉索施工关键技术

嘉绍跨江大桥为主跨428m的六塔独柱式四索面斜拉桥。独柱、四索面的结构决定了斜拉索施工难度大、控制精度高。文章介绍了嘉绍大桥斜拉索施工的主要方法和创新工艺，为同类工程提供了借鉴与参考。     

隧道采空区处理技术探讨

采空区是隧道施工的一大难点，其处理技术及其安全措施实施的好坏直接影响到隧道施工及运营安全。以水塘隧道施工为例，结合该隧道采空区的特征，介绍了采空区的处理方法及所采取的安全防护措施，以供同类工程施工参考。     

Prioritizing bicycle paths in Belo Horizonte City,Brazil: Analysis based on user preferences and willingness considering individual heterogeneity

Using bicycles as a commuting mode has proven to be beneficial to both urban traffic conditions and travelers’ health. In order to efficiently design facilities and policies that will stimulate bicycle use, it is necessary to first understand people’s attitudes towards bicycle use, and the factors that may influence their preferences. Such an understanding will enable reliable predictions of bicycle use willingness level, based on which cycling facility construction can be reasonably prioritized.As people often have different perceptions on exercising, green transportation, and traffic conditions, effects of potentially influencing factors on people’s willingness of using bicycles tend to be highly heterogeneous. This paper uses a random parameter ordered probit model to analyze how travelers’ willingness of using bicycles is influenced by various socio-economic factors in Belo Horizonte City, Brazil, with the consideration of individual heterogeneity. The data was collected through the 2010 bicycle use survey in Belo Horizonte City. Results show that, first, the willingness of using bicycle is favored by middle income class household, and negatively related with commuting time. Second, people who rent apartments tend to be more willing to use bicycles. Third, if a person is currently walking a long time to work, he/she would be most willing to commute with a bicycle in the future. Those currently commuting a relatively short distance by motorcycle and bus follow this group in terms of willingness to commute by bicycle in the future. Car users seem to be difficult to convert to bicycle users. Moreover, the estimation shows clear evidence that significant individual heterogeneity indeed exists, especially for education level, necessitating the consideration of such an effect. With the calibrated model, residents’ willingness of using bicycle commuting is then estimated for the entire Belo Horizonte City using the 2010 Census and the 2012 O/D survey data. The results are cross validated using the bicycle path preference information, also obtained from the 2010 bicycle use survey.     

嘉绍大桥大吨位提升站设计与施工

嘉绍大桥上部结构施工中,为满足架桥机的拼装及节段箱梁的提升功能需在深水域设置大吨位提升站,该提升站控制起吊净重达300t,起吊跨度达53m。考虑强涌潮水压力的制约、冲刷以及台风的影响,经综合比较,采用固定式提升站方案。提升站立柱采用钢管结构,下部为打入钢管桩,钢管桩通过联结系与主桥基础连接,充分利用主桥基础抵抗部分水平力;提升站主梁采用钢箱梁,单个提升站设置2片主梁,主梁上方布置单侧单轨移动天车。提升站立柱在工厂分段制造,工地上现场拼装;主梁在工厂分3节制造,运输至现场焊成整体。     

新建客运专线接入既有客运专线信号改造施工调试技术

主要阐述新建客运专线接入既有客运专线引起既有客运专线信号工程改造的施工方案、方法和调试技术。