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color:red"><b>膜结构车棚焊合膜节点</b></span></td> </tr> <tr> <td align="left" valign="top"> <br /> <table > <tr> <td align="left"><!!膜结构车棚焊合膜节点!!><!正文内容!><br><p style="text-align:center"><img title="" alt="" src=" http://img.huanlj.com/up/20170515/8f0144943494fc701c6e73f7e45b3f28_mark.jpg "></p><a title='膜结构车? href='http://mrdustpan.com'>膜结?a title='车棚' href='http://mrdustpan.com'>车棚</a></a>焊合膜节?br><br>焊合膜节点工业化程度高、技术品质(Character)易保?起保障作用的事物),是膜结构应用最广泛(extensive)的节点。膜结构公司是一家从事膜结构设计、制造、安装、维护为一体的专业<a title='膜结构工? href='http://mrdustpan.com'>膜结构工?/a>公司,公司自成立以来一直秉承“顾客至上,质量为本。膜结构公司拥有一批高素质的人才队伍,经验丰富,专业性较强,对膜结构行业有着深入的了解,能够满足顾客对产品新颖性与实用性的双重需求。膜结构车棚的篷布采用PVC/PVDF/PTFE/ETFE,而膜材的最大特点是强度高、耐久性好、防火难燃、自洁性好,不受紫外线影响,使用寿命长,一?5-30年。具有高透光率,透光率为13%,对热能反射率73%,热吸收量很少。正是因为这种划时代的膜材料的发明,使膜结构车棚成为现代化的永久建筑。膜节点形式常三种,搭接、单面背贴、双面背贴,如图。搭接宽度由结构受力和膜材强度(strength)决定,最小宽度需满足结构受力最低安全度,最大宽度至膜材等强。单面背贴宽?0 N100,双面背贴宽?0·60。膜裁切片为理想曲面,主体膜利用?availability)高。背贴条可采用与结构一致的膜,或专用背贴条膜。专用背贴条膜基布纤维应保持与主体膜等强,且纤维方向?plusmn;450,单面涂面层涂层,而另一面涂层可焊?br><br><br>聚氯乙烯(Polyvinyl chloride)/PES膜常用焊合方法有:高频(Induction Heating)焊、热吹风?Draught Fan)、热烙铁等,后两种适合有经验(experience)工程师现场二次膜、修补作业,不应用于主体结构。焊合膜节点由膜涂层或表面层焊合,剪切传力,膜受力均匀(jūn yún)、连续(Continuity),单向拉伸至少应?5%膜材强度。焊合膜节点适合可焊膜材,部分不可焊膜需要焊合面打磨。PTFE/GF膜在工厂和现场用热脉?mài chōng)(高温)焊合。焊合加热,然后收缩,PVC/PES约o?%,PTFE?%.因此,长缝焊合过程中需施加特定预张力(解释:物体受到拉力作用时的相互牵引??br><br><br>?.2.3a焊合膜节点易撕裂,焊合面受法向拉力,此时,应增加连接膜片,如?.<br>  2. 3b,连接膜片应工厂焊合,视为主结构体而非二次膜。膜结构工程作为一种建筑体系所具有的特性主要取决于其独特的形态及膜材本身的性能。恰由于此,用膜结构可以创造出传统建筑体系无法实现的设计方案?br><br><br>膜焊合节点破坏形式常为:黏结滑移撕裂或剥裂(?.<br>  2. 4a)、邻近焊合缝处断裂(fracture)(图8.<br>  2. 4b)、搭接区撕裂与断裂(?.2.4c)。搭接宽度较小,易出现黏结撕裂;搭接较宽,由于焊合过程局部(part)温度(temperature)升高(PVC/PES?0°C左右)对膜材的影响,因此,在接近焊合缝区域应力畸变(指:畸形地变化),发生破坏,或者复杂的破坏?br>式,焊合区域撕裂与破坏。膜结构车棚无论是商场还是小区,停车棚都是必不可少的。为了保障大家的生命安全,停车棚建造时如遇到建造不稳会造成很多事故。当焊合节点强度处于85 010膜材强度时,节点破坏多为第二种情况,应力畸变所致膜受损?br><br><br>焊合膜节点防水和气密性好,但搭接宜按?.2.2,利于膜面泄水,减少积尘纳污。焊合缝方向应与膜经纬向一致、对称(symmetry)正交,特别是大型重要结构,但较小膜、曲率大或边缘膜,焊合缝常与膜经纬向非正交,在应变补偿和膜片放样时应予区别。在加工制作时,如无熟练技术保障,至少每批膜应做一组(三件以上)焊合节点性能(function)测试,保证焊合膜节点品质?br><!/正文内容!></td> </tr> </table></td> </tr> </table> <div id="aszvhtemu5" class="clear"> </div> </div> <div id="aszvhtemu5" class="rightbot"> </div> </div> <div id="aszvhtemu5" class="leftr"> <div id="aszvhtemu5" class="leib2"> <div id="aszvhtemu5" class="tit"> 新闻中心<em>News Center</em></div> <div id="aszvhtemu5" class="nr"> <h4 sid='0001,0004'><a href="/list73-543.html" title="行业动?>行业动?/a></h4> <h4 sid='0001,0004'><a href="/list73-584.html" title="技术问?>技术问?/a></h4> <h4 sid='0001,0004'><a href="/list73-585.html" title="公司新闻">公司新闻</a></h4> </div> <div id="aszvhtemu5" class="leftbot"> </div> </div> <script type="text/javascript"> productSelectCurrentPosition("0001,0004"); 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