混凝土搅拌输送车螺旋叶片压模的设计

本文介绍了混凝土搅拌输送车螺旋叶片的传统高型压模的设计方法,提出了低型压模的投影改造法设计原理,并举例说明低型压模的应用。本文还扼要叙述了三种压模设计方法的特点,介绍了压模的制作要点。     

城市公共建筑外环境中模纹绿篱设计浅析

本文就我国城市建筑外环境中模纹绿篱设计进行探讨,简明阐述了模纹绿篱的定义、分类及对城市公共建筑外环境的影响,模纹绿篱设计的生态学相关理论和园林美学相关问题,以及设计方法,包括环境分析、纹样设计及植物选择.     

机制模袋在油田防护工程中的应用

对机制模袋进行了介绍,探讨了机制模袋的类型和主要技术特点,通过机制模袋护坡在江心岛井区防护工程中的应用,详细阐述了模袋的设计与加工制造,提出了机制模袋施工的要点,以推广模袋混凝土的应用.     

顶模钢平台的平面布置优化设计——以某超高层塔楼为例

针对超高层顶模钢平台平面布置过程中缺乏相应规范、可参考文献较少和各专业协同设计困难等问题,对顶模钢平台的平面布置优化设计进行了研究.基于超高层项目实例,介绍了顶模平面布置的重要性、设计原则及协同设计方法.过程中归纳和总结了相关实施要点,给出了设计参数取值,得到一套协同优化设计的标准模式.     

多孔定位片冲压工艺分析及其模具设计

针对多孔定位片结构较简单、内孔有较高精度的特点,设计了一套冲压倒装复合模。根据模具的结构特点,进行零件的工艺性分析、基本工艺计算,完成了模具非标准件的设计及标准件的选用和相关设备的选择。应用CAD软件设计了凸模、凹模、凸凹模等零部件。     

我国爬模技术发展历程与技术进步

简单回顾了我国爬模的发展历程,展现了目前爬模在工程中的应用情况,详细介绍了爬模的原理和它的特点,通过多年来爬模的实践与认识,提出了新型爬模的研发方向和超高层建筑爬模施工技术的发展趋势。随着液压爬模不断的工程应用、设计改进、技术创新,我国的爬模技术必将在超高层建筑施工中发挥重要作用。     

异型材挤出模设计

本文重点介绍了异型材挤出机头和定型模的设计,并用以与进口模具作了对比,认定本模具具有适合国情的特点,可供异型材挤出模设计、使用单位参考。     

预制槽模在住宅现浇过梁施工中的应用

在砖混住宅现浇过梁施工中,用U形预制混凝土槽模代替一般的木模支模工艺,可有效节约材料和人工。本文介绍了槽模的设计和支模工艺。     

谈箱梁模板的设计

结合多年来箱梁施工的经验,从底模设计、侧模设计、内侧模强度及刚度计算等方面介绍了箱梁底模及侧模的设计计算,提出在模板设计中,由于工地现状及材料不同,可能使设计的框架形式不同,但计算模式相同。     

爬模体系模块化设计方法研究及应用

分析了模块化理论在爬模产品中的研究应用现状,提出了一种爬模体系模块化设计方法。基于功能结构启发式方法,将爬模体系划分为5大模块,设计了模块实体,并将模块组合成产品,最终应用于实际工程中。结果表明模块化设计能够显著提高爬模体系施工效率。     

彩板组角门窗生产工艺与设备

引进意大利赛柯公司彩板组角门窗的生产技术与设备,制造46系列彩板门窗,因耗料多,零附件、模具、工艺复杂,产品造价高(250元/m~2),难于大面积推广.为降低造价,本文优化46系列门窗设计,开发出造价为160元/m~2的30系列彩板组角门窗.文中对30系列门窗生产所用型材、生产工艺及设备、产品性能作了详细介绍.     

主厂房压型钢板作底模现浇楼板工艺

结合大同二电厂三期工程,针对主厂房压型钢板作底模现浇楼板施工工艺进行了介绍,并总结归纳了采用压型钢板作底模现浇楼板的优点,以期促进压型钢板作底模现浇楼板工艺的推广应用。     

塑料推拉窗型材模具设计与调试

提出了塑料推拉窗型材模具的设计原则，阐述了模具的工作原理、结构、制造工艺及主要设计参数，着重介绍了主要零部件的设计方法，总结了模具调试的经验和修整方法。     

塑料异型材摸具中压条的设计

压条是塑料异型材中截面很小的一种,但在整体装配中起着举足轻重的角色。本文着重介绍不同的压条在设计中应该注意的各种不同问题及解决方法。     

PVC塑料纱窗框的设计生产

阐述了PVC塑料纱窗框的设计和生产,其中包括纱窗框型材断面设计、机头模具设计、配方设计、主要设备、生产工艺和如何排除生产中的不正常现象。     

门窗用塑料异型材的质量检测

提出了塑料门窗用异型材存在的一些质量问题,阐述了异型材质量检测的几个主要环节及相应的国家标准,并就提高此项产品质量提出了建议。     

建筑玻璃风荷载与塑料窗型材杆件风荷载的探讨

在建筑围护结构中,不能忽视外窗建筑玻璃的风荷载计算。本文从《建筑玻璃应用技术规程》三个版本对玻璃的风荷载设计条款和计算公式的区别方面,探讨了外窗杆件的风荷载与建筑玻璃的风荷载计算的关系,强调在进行外窗风荷载计算时,不能忽视建筑玻璃的风荷载的计算。     

磁吸附式塑料纱窗研究

以不增塑、适度填充、增韧改性的硬聚氯乙烯异型材,经二次加工、组装而成的可代替现有钢纱窗的塑料纱窗,用钕铁硼永磁体吸附在钢窗上,配件少,且无需打眼、攻丝,便于家庭安装,使用效果良好。     

PVC门窗型材耐低温性能的研究

介绍了影响PVC门窗型材耐低温性能的几个重要因素，以及提高型材的耐低温性能的措施。     

Web crippling behaviour of laterally restrained cold-formed steel re-entrant profiled deckings

Web crippling failure is often found to be critical in cold-formed steel profiled deckings during construction of composite slabs. Therefore, accurate prediction to the web crippling resistances of profiled deckings over internal supports under hogging moment is highly desirable. This paper presents an extensive experimental investigation into the structural behaviour of laterally restrained re-entrant profiled deckings under concentrated loads. A total of 104 web crippling tests on fully supported re-entrant profiled deckings with nominal yield strengths at 235 and 550 N/mm² are carried out to provide data for direct comparison with design resistances obtained from codified design rules. It should be noted that in the past, little attention has been paid to establish the lateral restraint condition of profiled deckings under concentrated loads in tests. Hence, local section distortion or ‘section spreading’ is often observed in tests but seldom dealt with rigorously during design development. In the present study, effective lateral restraints are provided to the test specimens in order to fully mobilize the web crippling resistances of the profiled deckings. It is found that the measured web crippling resistances are typically 20%–40% higher than those obtained from the codified design rules given in BS5950: Part 6, Eurocode 3: Part 1.3 and the North America Specification, depending on the steel grades and thicknesses, the load bearing lengths as well as the loading conditions.

In general, both BS5950 and Eurocode 3 give conservative web crippling resistances for re-entrant profiled deckings with both low and high strength steel under internal and end loading conditions. Moreover, the corresponding resistance factors determined according to a codified reliability analysis are considerably larger than the required values. Thus, the design rules are reliable and conservative, although they tend to be very conservative for profiled deckings under end loading condition. However, an examination on the design rules given in the NAS shows that only some of them are applicable to predict the web crippling resistances of low and high strength steel re-entrant profiled steel deckings. The design rule for IOF condition always gives both conservative and reliable resistances for both low and high strength steel profiled deckings, compared to the measured values. The design rule for EOF condition is also found to be both conservative and reliable for low strength steel profiled deckings only, but not for high strength steel profiled deckings. The design rules for ITF and ETF conditions are not applicable for both low and high strength steel profiled deckings according to the reliability analyses.

It is demonstrated that a set of new design rules specifically for re-entrant profiled deckings is needed for both improved efficiency and reliability. Moreover, the comprehensive set of test data is readily adopted to calibrate both finite element models and design expressions in subsequent studies.