锦屏二级水电站深埋特大引水隧洞关键技术

Seven tunnels across Jinping Mountain are arranged for Jinping Ⅱ Hydropower Station, with a total length of about 120 km. Among them, four headrace tunnels have a length of 16.67 km, an excavated diameter of 12.4-14.6 m, and a cover depth of 1 500-2 000 m in general. The maximum cover depth is 2 525 m, and the maximum external water pressure is more than 10 MPa. The tunnels are featured by great length, great depth and large diameter. It is the largest and most difficult among the underground tunnel groups built or under construction in China and even the world. With complex hydrogeological conditions and special topographical conditions along the tunnels, many challenging problems, such as rock burst under high in situ stresses, groundwater inrush in karst strata and failure of loading bearing structure, were encountered during construction. A great amount of groundbreaking studies were carried out regarding these problems. The key technical problems during construction of extremely large and deep tunnels were solved successfully. Safe and rapid tunnel construction and stable operation were achieved. The hydropower station started operation in 2014 and has been in a safe and stable operation state. The successful construction of headrace tunnels of Jinping Ⅱ Hydropower Station can provide some experiences and reference for deep tunnel projects in the world.     

中铁十九局

中铁十九局集团承建了包西铁路陕西段BSX-1标470．22km的铺架工程和156km的土建工程施工。该桥段共有路基土石方1200多万m^3；特大桥7座，大桥14座，中桥6座，小桥涵299座，T梁预制991孔，架梁1710孔；     

数字高程投影法计算复杂地形采空区影响边界

数字高程投影法与垂直断面法可用于计算压煤预留煤柱宽度的计算,垂直断面法还可用于计算采空区影响边界,数字高程投影法计算采空区影响边界应用较少。在采用断面法确定复杂地形条件煤矿采空区影响边界时,为求准确就要绘制大量断面,工作量比较大。实际工作中一般作简化,但确定的影响边界线范围比较大且不合理。介绍如何用数字高程投影法计算复杂地形条件下采空区的影响边界,与垂直断面法相比,在复杂地形条件下,应用数字高程投影法计算采空区影响边界不仅有更强的准确性、实用性,而且更方便于设计选线。     

大跨度小净距隧道的数值模拟研究

以二广高速公路怀集至三水段西岸隧道为例，采用ANSYS有限元分析软件对洞口段开挖过程进行了模拟．获得了先挖隧道的位移、应力的分布规律及须采用的加固措施。     

CA7220小红旗轿车侧围总成检验设备

ＣＡ７２２０小红旗轿车侧围总成检验设备，是用于检验侧围焊接总成各部位形状、位置、尺寸的综合检验夹具。通过对侧围结构的分析，制定出合理的结构方案。采用机械翻板机构及交叉滑板机构等高精度的测量机构，满足了使用要求。     

小断面水工隧洞施工机械选型及配套

结合实例,介绍小断面水工隧洞施工运输机械设备选型配套过程,为同类型的隧洞施工积累了经验.     

基于智能仿真的机械故障诊断方法研究

文章总结了机械故障诊断技术中应用仿真技术的4种模式，提出了将仿真技术与目前的智能方法相结合的思路，建立了结合神经网络和仿真技术的机械故障诊断方法的分析流程。文中所设计的故障诊断方法可以利用小样本来对机械设备进行故障诊断，因此，具有广泛的工程实用性和推广价值。     

一款实用与时尚兼备的摩托车——宗申小太子

2005年9月16日上午10点,来自全国的经销商亲自参与装配的第一辆宗申小太子ZS125-30在宗申集团柔性生产线上下线。ZS125-30整车装配工艺具有较高的标准,27种关、重零部件(如:减震、车架、油箱、平叉、轮系等)都经过了严格的在线检测,ZS125-30共使用了22套检具,花费了近200万。对     

《铁路交通噪声与震动》出版

由华东交通大学雷晓燕、圣小珍教授编著的《铁路交通噪声与震动》已由科学出版社出版发行。     

接地变压器保护整定

分析了中性点经小电阻接地系统发生单相接地时的电流分布,对曲折型接地变压器保护与电缆馈出线零序过流保护的配合问题进行了探讨,并阐述了个人的观点。