简支梁预制节段拼装施工

广州市轨道交通四号线11标工程简支梁采用节段拼装施工。本文介绍节段拼装架桥机的构造以及预制节段梁拼装施工等内容。     

高速公路附属设施的施工及要求

主要论述了高速公路各项附属设施的作用、施工要点和质量要求。     

浅析国有大中型建筑企业实施主辅分离与改制分流

本文从阐述国有大中型建筑企业实施主辅分离、辅业改制分流政策的出台背景入手,较详细地分析了积极推进主辅分离、改制分流工作的重要性和必要性,并指出在此项工作中需注意掌握的几个环节和选择的几个因素。可供欲进行此类工作的管理人员参考。     

某型号武器系统跟踪机构装配过程研究

总结了某型号武器系统红外跟踪探测跟踪机构的装配过程控制技术和测试。扼要地叙述了跟踪机构的结构特点、性能指标、机械装配及装配过程中采取的一系列工艺措施。通过优化设计装配顺序和工装,为关键部件的装配和检测创造了条件,使产品的装配质量大大改观,保证了产品的一次装配成功。     

Ergonomic and biomechnical analysis of automotive general assembly using XML and digital human models

Automotive general assembly requires many manual assembly operations to be carried out by human workers. Ergonomic analysis is an important part of the design and evaluation of products, jobs, tools, machines and environments for safe, comfortable and effective human functioning. Most recent researches have involved the evaluation of working conditions to prevent work-related musculoskeletal disorders. The majority of previous research on automotive companies has mainly considered the results of ergonomic analyses such as RULA (Rapid Upper Limb Assessment), REBA (Rapid Entire Body Assessment) and OWAS (Ovako Working Posture Analysis System). Analysis of static posture including reachability, clearances for arm, hand and tool has also been used to evaluate working conditions. However, in addition to static posture analysis, a biomechanical analysis in dynamic conditions should also be conducted. There are no integrated frameworks or standard schema for ergonomic analysis using digital human models in digital environments. The purpose of this paper is to propose a new framework for the evaluation of working conditions by ergonomic and biomechanical analysis using digital models based on XML standard schema, including: products, processes, manufacturing resources and human workers. This paper presents the analysis results using the proposed framework for automotive general assembly operations. We propose a new framework for the evaluation of the assembly operations and their environments. Then we apply a digital human model to the dynamic simulation of general automotive assembly operations based on standard schemas in XML and PPRH (Product, Process, Resource and Human). Using PPRH information based on a standard XML schema to analyze the ergonomic and biomechanical results, the engineer can visualize, analyze and improve assembly operations and working environments in automotive general assembly shops using digital models.     

分体式辙叉拉杆的应用

道岔护轨及辙叉部分是道岔工作的难点 ,护背距离、查照间隔即 48— 91不易控制 ,尤其是 91不易控制。岔枕由于经常改道 ,道钉眼孔扩大 ,持钉能力差而造成失效。分体式辙叉拉杆的研制 ,从根本上控制了 48—91。     

北京地铁八通线路基工程设计

北京地铁八通线是北京继西直门—东直门城市铁路之后的第二条一次性铺设无缝线路的轨道交通线路 ,在总结城市铁路经验的基础上对八通线的各个方面都进行了设计优化。介绍八通线路基工程设计中的碎石道床路基填筑标准、整体道床路基处理技术、碎石道床与整体道床过渡段路基设计及路基支挡结构物方案。     

连续梁匹配预制悬臂拼装测量控制技术

结合广州市轨道交通四号线11标连续梁采用匹配悬臂拼装施工的测量控制中遇见问题,对连续梁悬臂拼装施工的线形控制、标高及合拢段测量控制技术作一描述。     

预制节段拼装连续梁桥设计要点和施工关键技术

介绍预制节段拼装连续梁桥构造设计要求、设计计算方法及预制拼装施工关键施工技术。针对苏通大桥75 m跨径连续梁桥工程实例,对桥梁线形控制、匹配面处理、体内体外预应力施工等要求进行探讨,为类似工程提供一些经验。     

船体分段装配的三维建模与动画设计实例介绍

船体分段构件装配过程的三维动画演示的目的是要从各个方位展示出该分段的结构特点,要求完成各构件的建模及大小分段的组装等一系列动画过程。动画过程中,构件的种类较为繁杂,该文只对典型的动画制作过程作系统介绍。