妈港仓码公司场桥“油改电”(高架直流)设计与实施

介绍了深圳妈港仓码公司场桥"油改电"高架直流方案的设计和实施。在总体介绍的基础上,着重介绍了高架供电的主要结构型式及特点,并介绍了制作与安装所满足的规范。     

浅谈透水基层在路面排水中的运用

该文阐述了透水基层特殊材料在路面层中实际运用的可行性和关键技术数据分析。通过对桃江路景观道路综合整治工程中采用的道路排水方式和相应道路结构层的分析,论证了正确的道路排水方式对道路整体使用寿命和运营状况的重要性。     

无填料振冲法在粉细砂地基加固中的应用

以陕西榆林迁建机场跑道工程为背景,研究无填料振冲法在加固粉细砂地基中的应用。现场测试结果表明,经振冲处理后的地基轻型动力触探锤击数成倍增加,地基承载力明显提高,压实系数有所增大,特别是加固后的桩体与桩间土的承载力和密实度等指标接近,说明加固后的场地地基均匀,能满足机场跑道地基的要求,且具有明显的经济效益。     

喷涂型聚脲弹性体在地铁车站防水工程中的应用

喷涂型聚脲弹性体具有优异的物理力学性能及耐老化、固结快、施工方便的特点,在国内外得到非常广泛的应用。简要介绍了喷涂型聚脲弹性体的反应机理和喷涂机理、性能特点;着重叙述了喷涂型聚脲弹性体的喷涂施工工艺和设备以及注意事项。上海轨道交通8号线四平路站、10号线同济大学站防水工程应用喷涂型聚脲弹性体取得了良好的效果。     

Mechanical properties of asphalt pavement structure in highway tunnel

A linear full 3D finite element method （FEM） was performed in order to present the key design parameters of highway tunnel asphalt pavement under double-wheel load on rectangular loaded area considering horizontal contact stress induced by the acceleration/deceleration of vehicles. The key design parameters are the maximum horizontal tensile stresses at the surface of the asphalt layer, the maximum horizontal tensile stresses at the bottom of the asphalt layer and the maximum vertical shear stresses at the surface of the asphalt layer were calculated. The influencing factors such as double-wheel weight; asphalt layer thickness; base course stiffness modulus and thickness; and the contact conditions among the structure layers on these key design parameters were also examined separately to propose construction procedures of highway tunnel asphalt pavement.     

Energy-aware load-balaning fault-tolerant routing scheme for ad hoc sensor networks

Most routing protocols for sensor networks try to extend network lifetime by minimizing the energy consumption, but have not taken the network reliability into account. An energy-aware, load-balancing and fault-tolerant routing scheme, termed as ELFR was propsed to adapt to the harsh environment. First a network robustness model was presented. Based on this model, the route discovery phase was designed to make the sensors to construct into a hop-leveled network which is mesh structure. A cross-layer design was adopted to measure the transmission delay so as to detect the failed nodes. The routing scheme works with acknowledge （ACK） feedback mechanism to transfer control messages to avoid producing extra control overhead messages. When nodes fail, the new healthy paths will be selected locally without rerouting. Simulation results show that our scheme is much robust, and it achieves better energy efficiency, load balancing and maintains good end-to-end delay.     

机场沥青道面管理与预防性维护对策

为了提高机场沥青道面的使用寿命,降低其养护与管理费用,分析了其类型、特性与应用现状,研究了其主要影响因素与破坏机理,提出了相应的管理与预防性维护对策。研究发现:建立严格的管理机制,禁止超载,加强日常维护与培训飞行员正确使用道面是减少破损的有效方法;对现有病害类型,提出了表面处治及改性稀浆封层等薄层修补维护方法;根据不同季节的气候特点与水温条件的变化规律,按照"预防为主,防治结合"的原则,针对季节性病害根源,因地制宜地采取有效的技术措施,做好季节预防性养护工作;加强道面状况评估,把握最佳养护时机和制定合理的养护标准可有效提高机场沥青道面的使用性能。     

韩国地铁考察启示

地铁是韩国最具有特色的现代化交通设施,正在逐渐成为最受大众欢迎的交通工具。考察韩国地铁后,本文提出促进我国轨道交通发展的三点启示。     

跨铁路线的高架公路施工难点及分析

随着我国交通行业的快速发展,高架公路跨越既有铁路的形式也非常普遍。本文总结了铁路营业线施工的要点,并分析了跨铁路线高架公路施工的难点,并对相应的施工措施进行了分析和总结,为同类施工提供参考。     

Measurements of car-body lateral vibration induced by high-speed trains negotiating complex terrain sections under strong wind conditions

Assessment of the vibration of high-speed trains negotiating complex sections of terrain under strong wind conditions is very important for research into the operation safety and comfort of passengers on high-speed trains. To assess the vibration of high-speed trains negotiating complex sections of terrain under strong wind conditions, we performed a field measurement when the train passes through typical sections of complex terrain along the Lanzhou–Xinjiang high-speed railway in China. We selected the lateral vibration conditions, including the roll angle and lateral displacement of car-body gravity centre through two typical representative sections (embankment–tunnel–embankment and embankment–rectangular transition–cutting) for analysis. The results show that the severe car-swaying phenomenon occurs when the high-speed train moves through the test section, and the car-body lateral vibration characteristic is related significantly to the state of the terrain and topography along the railway. The main causes for this car-swaying phenomenon may be the transitions between different windproof structures, and the greater the scale of the transition region between different windproof structures or landform changes, the more obvious the car-swaying phenomenon becomes. The lateral vibration of the car-body is relatively steady when the train is running through terrain with minor changes in topography, such as the windbreak installed on the bridge and embankment, but the tail car sways more violently than the head car. When the vehicle runs from the windbreak installed on the embankment into the tunnel (or in the opposite direction), the tail car sways more intensely than the head car, and the head car runs relatively stable in the tunnel.