常泰长江大桥专用航道桥钢梁安装方案设计

常泰长江大桥天星洲和录安洲两座专用航道桥为刚性梁钢桁拱桥,跨度布置均为(168+388+168)m,主梁采用2片主桁双层板桁组合结构,N形桁式,焊接整体节点构造,主拱采用与主梁反向的N形桁。针对该桥施工难点,进行钢梁安装方案设计。主桁杆件采用整体节点散拼,联结系采用单根杆件拼装,每节间的桥面板分为3块安装;边跨钢梁在临时支架上采用单悬臂拼装,中跨钢梁采用扣索塔架悬臂架设、跨中分步合龙钢桁拱和系梁的总体方案施工。中跨钢梁悬臂拼装时,对拱梁同步和先拱后梁2种施工方案进行综合比选可知:2种方案均满足受力要求;先拱后梁方案压重量比拱梁同步方案少60%,但工期长3个月,并增加2台吊机,拱梁同步方案的经济性更优。因此,选择拱梁同步方案。

ROV搭载吸力泵安装大型吸力锚方案设计与实践

以珠江口盆地番禺4-2/5-1油田项目为目标,基于ROV(遥控潜水器)搭载吸力泵安装大型吸力锚的特点,对吸力锚顶部布置、吸力锚阀门设计、吸力泵选型及接口设计、吸力锚装船固定和安装索具设计等进行了研究,提出了吸力锚安装工艺流程及相关问题处理方案。现场实践效果表明,ROV搭载吸力泵模式安装大型吸力锚技术与国外已有的单独安装吸力锚案例相比节省了在水下连接锚链和吸力锚的工序和时间,达到了世界同类工程技术的领先水平,为未来同类型吸力锚的水下安装提供了有效的设计和安装经验。

人造石地面安装方案

国内人造石工程项目越来越多,既有很多成功案例,也有不少失败案例。究其原因,与设计师、甲方、施工方对人造石缺乏深刻的了解,行业缺乏规范指导有关。人造石工程应用过程中应该考虑应用环境、板材品种、板材规格、相关粘结材料性质,基层情况等。其安装最终的质量不仅取决于每种材料的性能、而且取决于不同种材料之间能否很好匹配,还取决于这些材料能否适合需要的使用环境。本文根据人造石的特性,分析了人造石项目在设计、施工、选材等方面应该考虑的各种因素,提出了科学、可靠的解决方案。

山西智能装备产业园铸锻联合厂房钢结构安装方案比选

本文针对山西智能装备产业园铸锻联合厂房钢结构工程,提出了6种安装备选方案,并基于德尔菲法和熵值法对六种钢结构安装方案进行比选。结果表明:综合安装法为本项目最佳的钢结构安装方法。

Design and Occupant-Protection Performance Analysis of a New Tubular Driver Airbag

An airbag is an effective protective device for vehicle occupant safety, but may cause unexpected injury from the excessive energy of ignition when it is deployed, This paper focuses on the design of a new tubular driver airhag from the perspective of reducing the dosage of gas generant, Three different dummies were selected for computer simulation to investigate the stiffness and protection performance of the new airhag, Next, a multi-objective optimization of the 50th percentile dummy was conducted, The results show that the static volume of the new airhag is only about 113 of the volume of an ordinary one, and the injury value of each type of dummy can meet legal requirements while reducing the gas dosage by at least 30%, The combined injury index （Pcomb） decreases by 22% and the gas dosage is reduced by 32% after optimization, This study demonstrates that the new tubular driver airbag has great potential for protection in terms of reducing the gas dosage,