A new approach for generating function sequences—Hybrid Bridge functions derived from Walsh functions

This paper reviews the essence of the Walsh and Bridge functions from the point of view of the recursive relationship; it also unifies their expressions. A new kind of function—the hybrid Bridge function—is constructed from the definition of the hybrid matrix, in which the row vectors are taken from the Walsh and Bridge function matrices. We also propose a new approach for generating function sequences; one that uses the column vectors of the hybrid Bridge function matrix as the new function sequences. These sequences are able to adjust the number of zeroes flexibly; thus, resolving the constraint on the application of excessive zeroes in Bridge function sequences, while at the same time maximizing the research field for function sequences. Through strict mathematical analysis, it is proved that when the initial matrix order of the parent matrices and the similarity of the hybrid matrices meet certain conditions, the hybrid function sequences exhibit good orthogonal characteristics. This provides a theoretical basis for its further applications in communication systems.     

从徐冲大桥承台施工谈大体积砼温控技术

大体积混凝土在施工工程中若不采取适当的温控措施,因水化热会导致混凝土开裂,很有可能影响混凝土结构的耐久性甚至承载力,严重影响工程安全,应引起高度重视。文章通过以徐冲桥承台大体积混凝土的施工为背景,介绍了大体积混凝土的温度控制技术。     

Research on the special lifting devices for steel box girders of Sutong Bridge

Sutong Bridge is a cable-stayed bridge with a steel box girder and a main span of 1 088 m. The steel box girder of main span includes five portions ： back span large unit, large block of pylon, standard girder, back span closure girder and middle span closure girder. Each back span large unit is fabricated by welding several deck segments together in factory, and is erected by floating crane. As navigational clearance of the main bridge is high, the traditional truss lifting device can＇ t satisfy the requirement of domestic lifting cranes for this kind of lifting height and weight. Hence, a kind of lighter lifting device for the erection of back span large units was accepted for this bridge. In this paper, the design and use of this lifting device is introduced. The upper structure used lifting gantry to install the standard girder segment by cantilever method. Because the bridge＇ s navigation clearance is high, and the girder segment is wide and heavy, the meteorology and hydrology condition of the bridge district is abominable, and the requirements of long cable girder side pull-in, structure and performance propose high request to the lifting gantry. In this paper, the design and use key point of long cable pull-in angle adjustment device integrate into lifting gantry, is introduced.     

公路桥梁地基的承载力及沉降分析

公路桥梁施工过程中,地基的承载力和沉降能力对施工质量具有极大的影响。文章在分析已有相关研究进展的基础上,提出并分析了一种组合型复合地基的形成机理,同时对其承栽性能和沉降计算方法进行了讨论;分析过程和结果将为该复合地基的设计及其在公路桥梁建设过程中的工程应用提供必要的理论指导和技术支持。     

新建汾河大桥桥位设计洪水计算

根据在赵城水文站和柴庄水文站之间修建桥梁的实际情况,对水文站实测资料进行分析得到洪水洪峰流量,为大桥的设计提供依据。     

桥式起重机定子调压常见电气故障分析

通过济钢炼钢厂45t区域75t以上桥式起重机定子调压装置常见故障类型分析,总结出调压装置有故障记录的故障和无故障记录的故障出现的原因,以及解决方法,为以后更好的维护桥式起重机,使其更加稳定、正常运行做出总结,为迅速解决故障提供经验。     

风陵渡黄河公路大桥加固工程粘贴钢板施工技术

粘贴钢板是桥梁加固中常用措施之一,特别是对于桥梁普遍存在严重裂缝的情况,通过在梁体相应部位粘贴一定数量的钢板,可使钢板与梁体共同受力,阻止裂缝的继续发展。鉴于目前粘贴钢板技术尚有不足之处,结合工程实例,详细介绍粘贴钢板施工技术。     

论公路桥涵工程施工的安全技术措施

桥涵施工场地要想做到因地制宜、布局合理、避开水害侵袭、施工道路畅通、机械设备状况良好、防护设施稳固可靠、安全标语和警戒标志醒目,应对该项目的所有参建人员进行岗前安全培训;还需对高、难、险等工程及惯性事故易发的施工工序制定针对性强、便于检查的安全技术措施。     

浅议宿州市埇桥区中小型涵闸工程管理运用

本文根据涵闸运行过程中存在的涵闸工程标准偏低、设计简化及建设质量较差、配套设施不全、缺乏维修养护经费、工程管理不善等一系列问题,提出加强中小型涵闸管理的意见和建议,从而改善涵闸运行状况,发挥涵闸效益。     

杭州湾跨海大桥:大型工程集成创新的一个案例分析

集成创新是自主创新的重要形式,在复杂的大型工程中有着广泛的应用空间。本文以杭州湾跨海大桥建设为例,分析了集成创新在工程设计、工程施工、工程材料中的具体应用,并在此基础上提出了集成创新要以问题为导向、要从工程实际出发、要重在系统整体优化的方法论启示。