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针对山区高墩大跨度连续刚构桥梁施工的特点,结合工程实例,从主梁结构设计、悬臂浇筑施工技术要点、高墩边孔现浇施工、合龙段施工与体系转换控制技术等方面,对连续刚构桥梁施工技术难点和重要控制环节进行系统地分析,可为类似工程项目提供参考和借鉴。 相似文献
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利用船舶原理、船舶破损稳性规范标准、船舶在波浪中的运动理论及船模试验数据结果,综合分析并提出了基于最小许用初稳性基础上求解船舶初稳性安全余量的方法。 相似文献
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Mobility management measures taken by firms could potentially result in more sustainable transport choices and hence reduce traffic congestion and emissions. Fringe benefits offered to employees are a means to implement those measures. This paper explores the most common commuting-related fringe benefits currently provided by employers in the Netherlands, namely telework, flextime and allowance types like public transport passes, bicycle contribution, company cars and general financial compensation. By using the Dutch National Time Use Survey (TBO) 2005/2006, interrelationships among fringe benefits and correlations between company, employee, and (home and work) location characteristics and those employee benefits could be investigated. Logistic regressions and Tobit models are used for several estimations indicating the provision and the use of fringe benefits. The results show that relationships among fringe benefits exist, mainly between telework and flextime, but also between those flexible work arrangements and some types of commuting allowance. Furthermore, numerous job, person and geographical variables affect the probability of receiving and using the fringe benefits. For example, in the non-profit and the public sector sustainable commuting benefits are more often provided, the use of fringe benefits is strongly influenced by household composition and several allowance types show a significant correlation with the number of cars in the household. Moreover, firm location, in particular firm density, is highly related to mobility management measures taken by firms. 相似文献
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城市公交企业是城市公共交通服务的提供者,企业的经营状况直接影响到提供服务的动力,进而影响到整个公交系统的运转。依托交通运输主管部门开展的权威企业调查数据,从微观角度对11个城市76家公交企业的生产经营现状、偿债能力、财政补贴、成本费用构成情况等进行了分析。分析结果显示:调查的样本企业中95%的企业经营亏损,16%的企业资不抵债,企业获得的政府财政补贴能够弥补运营成本的35.9%左右,50%的企业单纯从事城市公交服务。在此基础上,参考了欧洲、日本、香港等地的公交发展经验,分别从政府加强扶持、企业改进自身管理水平等方面提出了推动公交企业走出经营困局的路径设想。 相似文献
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优先发展城市公共交通是一项重要战略 总被引:2,自引:0,他引:2
优先发展城市公共交通是党中央国务院做出的一项重大战略决策.介绍了优先发展城市公共交通战略决策的背景及重大意义.指出要统一思想,充分认识这项决策的战略地位,要从建设资源节约型、环境友好型、社会和谐型的城市发展目标的角度去贯彻落实;城市公共交通应坚持政府投入为主,论述了《关于优先发展城市公共交通若干经济政策的意见》的重要内容.明确城市政府既要承担公共责任,又要坚持市场改革方向,通过竞争,提高效率.最后,提出优先发展城市公共交通,必须坚持勤俭办一切事业的基本原则. 相似文献
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为研究第三纪砂质黄土条件下的大断面隧道施工变形控制技术,以宝兰铁路大断面黄土隧道施工为依托,通过midas数值模拟软件对比分析不同仰拱封闭距离引起拱顶沉降实测数据,阐述大断面黄土隧道施工变形规律,以确定其合理的仰拱封闭距离为35 m;采用三台阶临时仰拱法,合理控制开挖步距:上台阶为0.6 m,中台阶和下台阶为1.2 m;辅以注浆小导管超前支护和锁脚锚杆加固等技术措施,达到了很好的变形控制效果,最大沉降控制为50~160 mm;通过分析不同隧道断面净空变形规律,总结第三纪砂质黄土地质条件下,大断面黄土隧道施工预留变形量可取120~160 mm。 相似文献