长沙南湖路湘江隧道设计-施工总承包案例研究

近年来,我国建筑业已经在个别地区及项目上推行设计-施工总承包制度,然而在实际推进过程中却并不顺利,为使今后设计-施工总承包在我国建筑领域能够更好地完善与发展,通过对长沙市南湖路湘江隧道设计-施工总承包项目案例研究,阐述目前国内设计-施工总承包项目运行过程中出现的若干情况,分析设计-施工总承包模式下项目管理中设计与施工脱节、工程量差大、责任分工不明等主要问题,提出了加强设计与施工衔接、优化设计与施工方案、完善配套法律法规等改进措施。     

桂平航运枢纽二线船闸平面布置研究

为配合桂平航运枢纽二线船闸工程设计,采用定床物理模型试验和遥控自航船模试验相结合的研究手段,对桂平二线船闸工程布置进行研究,分析和论证设计方案的合理性。通过工程河段水流特性、枢纽调度对上、下游水流条件影响的模型试验,分析了工程河段水流特性,研究了二线船闸上下游引航道口门区和连接段航道通航水流条件和船舶航行条件,修改完善了设计方案,并最终确定了桂平二线船闸合理可行的工程布置方案。     

Corporatisation and Performance: A Literature Review and an Analysis of the Performance Effects of the Corporatisation of Port of Rotterdam Authority

Abstract

The ongoing process of port reform has led to an increasing number of publicly owned but corporatised port authorities (PAs). The performance effects of corporatisation have been analysed, for example, for the airports industry, often showing positive effects. This paper reviews the literature on port reform and the relationship between port governance structures and performance. It also presents a first case study on the effects of corporatisation of PAs, namely for the Port of Rotterdam Authority, a publicly owned but corporatised port development company. In 2004, this organisation was transformed from a municipal department to an independently operating company. The performance indicators to evaluate the effect of this corporatisation include market share, turnover, operating costs, profits, and investments. These indicators are evaluated for two periods, one prior to the corporatisation (1997–2003) and the other afterwards (2005–11). The comparison of these two periods shows that corporatisation has led to significant improvements of all performance indicators. The findings derived from this case study are relevant for the ongoing discussion on port governance models.     

液化天然气作为船用燃料的可行性研究

为减轻船舶航行对大气造成的污染,公认清洁且价廉的天然气自然地成为船用燃料的首选对象。目前已在高消费的北欧国家小型船舶上使用。基于收集到的资料,对天然气能否作为最理想和最经济的替代物,能否在航运业普遍使用作了可行性研究和探讨。     

Combining Intermodal Transport With Electric Vehicles: Towards More Sustainable Solutions

Abstract

This paper analyses the feasibility of incorporating electric or hybrid vehicles in intermodal transport for the transportation of containers in the pre- and post haulage (PPH) operation. In Europe, the intermodal transport market is being strongly supported, as it is seen as one of the keystones of a sustainable mobility system policy. The introduction of environmentally friendly electric/hybrid vehicles for the pre- and post haulage operation would mean a further enhancement leading to a more complete ecological intermodal transport chain. PPH operations are usually no longer than 30 km, and, hence, could possibly be handled by electric or hybrid vehicles.

Hybrid electric vehicles (HEV) combine electric and other drive systems, such as internal combustion engines, gas turbines and fuel cells. Hybrid electric vehicles merge the zero pollution and high efficiency benefits of electric traction with the high fuel energy density benefits of an energy source or thermal engine. The use of electrically driven vehicles for goods distribution has already been successfully proven in international demonstration projects, such as ELCIDIS. Transport of intermodal units (such as ISO containers), however, requires electric/hybrid heavy-duty goods vehicles, which are not readily available on the market, but for which the technology exists.

Different possibilities are assessed as to their technical, financial, organizational and environmental feasibility and suitability. This analysis is based on a typical mission for pre-and post haulage operations, such as type of trips, distance, frequency, urban/suburban, etc.     

斜交超浅埋地铁段桩板结构路基的设计与施工研究

在与超浅埋上海地铁#9线斜交的沪杭客运专线某段线路施工中,存在着地铁盾构管片扰动破环与上部开挖引起地铁盾构上浮这两大技术难题,经过设计比选,提出桩板结构路基的结构型式、几何尺寸与计算方案;考虑超浅埋地铁地段施工的高风险性,提出桩板结构路基的关键施工技术,包括:全套管钻孔桩施工技术、结构施工工艺流程等。实践证明,在斜交超浅埋地铁段,采用桩板结构路基在施工与运营期间未出现安全隐患,桩板结构路基有效控制了沉降变形,达到了确保既有地铁安全运营的目的。     

MA沥青混合料温控式双卧轴搅拌装置的试验研究

沥青混合料试验室现有搅拌装置存在诸多缺点,无法完成MA沥青混合料的试验研究。为满足MA沥青混合料试验的要求,采用正交试验的方法,以沥青混凝土拌合物宏观和微观均匀度作为测定指标,通过安排少量的多因素试验,确定了最优的搅拌装置结构参数及最优搅拌温度,并找到了影响搅拌质量的首要参数,制造出试验样机,填补了同类试验设备的空白,解决了MA沥青混合料无相关试验设备的难题。     

新型冷拌环氧改性合成沥青快速修补材料试验评价研究

对研发的新型冷拌环氧改性合成沥青快速修补材料进行了性能试验评价,通过拉伸试验确定材料最佳比例,进行冷拌环氧沥青混合料配合比设计,对环氧沥青混合料的马歇尔稳定度、高温车辙、小梁弯曲、水稳定性、耐油污性能等进行综合比较评价,并与应用较广泛的日本 TAF环氧沥青混合料进行了性能对比分析,试验结果显示研发的新型快速修补环氧沥青混合料具有良好的路用性能,可用于钢桥面铺装维修和高性能路面铺装工程。     

西藏林拉高等公路太阳能混合动力汽车运营可行性分析

文章通过分析当前混合动力汽车的发展技术,结合对西藏林拉路段丰富的太阳能资源以及路况分析,提出了引入太阳能的混合动力汽车新车型在林拉路段运营的可行性探讨。重点从方案提出及分析、经济效益分析、节能环保分析三个方面说明了林拉高等级公路运营太阳能混合动力汽车确实具有可行性。发展太阳能混合动力汽车在理论和技术已基本成熟,而且有一定的经济效益,还具有节能环保作用,可以为将来西藏发展新能源汽车提供科学依据。     

Y112铝合金表面氧化膜抗氯离子腐蚀能力的研究

为研究缓蚀剂对Y112铝合金在高浓度氯离子条件下的缓蚀作用，将铝合金试样浸泡在含有不同缓蚀剂的25％的CaCl2溶液中进行了对比试验。结果表明，氯离子在铝合金表面氧化膜中的渗透需要一定时间，缓蚀剂浓度过高反而会加速铝合金的腐蚀。设法增加铝合金表面氧化膜的厚度，有利于提高部件的抗腐蚀能力。