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一、问题的提出在土木、建筑工程的施工中,常遇到圆弧曲线的现场放样问题。即已知弦长和拱高,求作圆弧大样。在实际上,由于各种现场施工条件的限制,给圆弧曲线的现场放样带来一些困难。例如,在剧场工程中(图1),观众席位根据建筑设计上的要求,多排成一组 相似文献
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管道支架及基础是配合管道安装所进行的土建工作,一直以来,建筑中的管道吊挂支架主要以参考管道专业选用相关国家标准图自制为主,主要材料以角钢、槽钢、工字钢等型材为主要加工基材,然后通过焊接打孔等方式搭接,再配以各种自制的管夹及螺丝螺母标准件。支架做好后,还要进行几次喷涂等防腐处理。这样的加工方式费时费力,影响工期。 相似文献
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(上接第7期第26页)在建筑管道安装中,一般高度在1.8m以下的水平横管和竖直管道常使用单管卡子;1.8m以上的水平横管,不分管径大小,即使DN15的管道也使用支架,且一般都采用"一"字形支架。一般DN25以内的管道支架可用L25×3和覫6U形卡子制作。 相似文献
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新建铁路小角度跨门式墩运营电气化铁路时,为增加支撑体系底部与既有铁路接触网线之间的距离,采用贝雷梁下弦杆反撑工字钢的支架形式施工,以南宁枢纽金鸡村双线特大桥为工程实践,介绍跨既有线门式墩贝雷梁下弦杆反撑工字钢支架构造特点和施工方案。 相似文献
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根据新建向莆铁路招贤特大桥现浇连续梁的施工中,采用钢管桩加工字钢分配梁搭设支架的施工实例,介绍了跨公路施工门洞式支架搭设的设计和施工方法。 相似文献
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以珠海市南屏二桥施工为依托,针对该桥55.2m异型主塔施工难点,主要的施工方法有主塔采用悬臂爬模、上下横梁采用落地式钢管工字钢组合支架.详细介绍了施工的具体工艺和思路,并对主塔施工关键技术进行总结. 相似文献
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呼和浩特市引黄供水工程中采用的DN2000 PCP管道在华北地区首次设计和使用,针对其施工现场的特定环境,经过周密、严谨的计算,制定管道试压方案,攻克多项技术难关,为今后的施工积累了宝贵的经验。 相似文献
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Ⅰ形截面钢构件腹板屈曲后强度利用 总被引:3,自引:0,他引:3
介绍轻型门式框架I形截面钢构件腹板的设计原则和方法.首先从防止受压翼缘压入腹板来分析腹板高厚比的最大限值,其次分别论述腹板受剪屈曲后的极限剪力计算、受弯或压弯屈曲后有效宽度的确定,以及正应力和剪应力联合作用下屈曲后相关关系的计算. 相似文献
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焊接工形截面钢拱结构具有造型美、受力性能好、制作简便等优点,在国内外均得到了较为广泛的应用.然而,我国还没有钢拱结构的专用技术规程,现行钢结构设计规范及技术规程中也都没有针对钢拱结构的技术条文.相比较于直梁、柱中的腹板,焊接工形截面钢拱的腹板同样存在着正应力和剪应力,但两者最大的不同在于腹板的几何形状.钢拱的腹板呈弧形... 相似文献
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The elastic flexural–torsional buckling behaviour of arches with a central elastic torsional restraint has been reported elsewhere by the authors, and it was found that a central elastic torsional restraint restricts the buckling shape of an elastic arch and increases its elastic buckling resistance. However, both the inelastic buckling and strength of arches with a central elastic torsional restraint have hitherto not been investigated. It is not known whether the threshold stiffness for elastic buckling can be applied to arches which buckle inelastically, nor is it known how to determine the strength of steel arches with a central elastic torsional restraint. This paper modifies a finite element model for the nonlinear inelastic flexural–torsional analysis of steel I-section arches by including the effects of elastic restraints, and uses it to investigate the influence of central elastic torsional restraints on the inelastic flexural–torsional buckling and strength of steel I-section arches. It is found that a central elastic torsional restraint increases the strength of steel arches, but that the increase in strength decreases as the modified slenderness of the arches decreases. The threshold value of the stiffness of a central elastic torsional restraint at which the inelastic strength of an arch is equal to that of the corresponding arch with a rigid restraint is related to both the modified slenderness and included angle of the arch. For an arch with a low modified slenderness and with a small included angle which buckles inelastically, the threshold restraint stiffness is much smaller than that for an arch which buckles elastically. Design formulae for the strengths of steel I-section arches in uniform bending and in uniform compression with a central elastic torsional restraint are proposed. Comparisons with finite element results show that the proposed formulae provide good predictions for the strength of thin-walled steel I-section arches with a central elastic torsional restraint. 相似文献
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Investigations on lateral-torsional buckling behavior of stainless steel welded I-section beams were carried out through fourpoint bending tests. The Chinese austenitic stainless steel adopted in this study contains approximately 17% of Cr, which could be graded as EN 1.4401. The non-linear stress-strain relationship of the material, the residual stress distribution of the section and the ultimate moment capacity of the welded I-section beams were obtained from the experiments, and they were compared with those results predicted by analytical models recommended by several researchers. Besides, a new model is proposed to predict the residual stress distribution of the stainless steel welded I-section beams. 相似文献
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本文主要介绍磁法及电磁法对隧洞钢拱架及其地下连接筋检测的应用 ,运用CCT - 1磁梯度探测仪及管线探测仪对隧洞钢拱架及其地下连接筋进行检测 ,通过实例说明了该方法是可行和有效的 ,拓宽了方法的应用领域。 相似文献
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厦门港国际旅游客运码头客运联检大楼屋面为六片双曲钢结构屋面,屋盖钢结构采用钢管混凝土柱-弧形钢箱梁框架结构。本文探讨了屋盖弧形箱梁曲线形状的设计要点,以及弧形箱梁主次梁交接处、梁柱节点、柱脚的细部做法。 相似文献
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结合某Φ660焊管线主厂房工程实例,分析带吊车的钢结构工业厂房设计要点,对门式刚架、吊车梁、支撑、墙架等的设计进行介绍,可供同类工程设计参考。 相似文献
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工程设计中,一般仅对钢梁构件的强度、刚度、整体稳定性、局部稳定性做设计验算,而很少涉及钢梁截面扭转应力的分析。按照现行的结构设计理念,对结构构件的安全性要求进一步提高,有必要对钢梁截面在扭矩作用下的应力作出分析。文章以双轴对称工字形截面钢梁一端自由、一端固定为例,对其在约束扭转时应力进行分析。 相似文献