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type='text/javascript' language="javascript"></script> ?/p> <div class="zxmainlcont"> <p>  </p> <p style="text-align: center;"> <span style="color:#b22222;"><strong><span style="font-size:14px;">  1.疲劳问题</span></strong></span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  正交异性板结构以其重量轻、承载能力大、施工周期短等优点,在钢结构桥梁的建设中得到了广泛的应用,尤其是千米级的大跨径钢桥,其技术优势更加明显。但正交异性钢桥面板因局部轮载及结构细节应力集中影响,各类疲劳开裂问题突出,其中U肋与桥面板连接焊接接头处萌生的焊根裂纹及焊脚裂纹广受关注。该类裂纹一旦萌生,很可能向桥面板发展形成贯通裂纹,影响行车安全,且检测维护工作十分困难?/span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  桥面U肋加劲属于闭口形式,常规技术只能从外侧单面施焊,U肋腹板板厚较薄,要保证不烧穿又有足够的焊缝熔深并非易事。此外,即使实现?5%?5%的部分熔透焊,留?5%?5%的未熔合部分??mm?当超载现象成为常态时,这1?mm的未熔合部分应力集中,在车轮载荷反复作用下,面板与U肋焊缝处仍然容易产生疲劳裂纹?/span></p> <p> <span style="font-size:14px;">  </span></p> <p style="text-align: center;"> <span style="color:#b22222;"><strong><span style="font-size:14px;">  2.U肋焊接工艺发展现?/span></strong></span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  目前国内对于板厚8mm以上的U肋,要求焊缝熔透率80%以上,普遍还是选用两道焊工艺进行焊接,其焊缝根部相对不易烧穿,熔深也容易得到有效控制。U肋角焊缝焊接用金属粉芯药芯焊丝取代普通药芯焊丝已形成共识,例如港珠澳大桥钢箱梁所有U肋角焊缝的焊接采用了金属粉芯药芯焊丝,包装方式也由容?00kg以上的桶装焊丝取代过?5kg的盘装焊丝?/span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  为进一步提高U肋角焊缝的焊接效率,近年来开始应用双丝气体保护焊工艺,通过在门式焊接操作机上同一焊臂上前后安装两把焊枪来实现。双丝不共熔池,前枪采用药芯焊丝CO2气体保护焊或实芯焊丝富氩气保护焊,进行打底焊,后枪采用药芯焊丝CO2气体保护焊,进行盖面焊?/span></p> <p> <span style="font-size:14px;">  </span></p> <p style="text-align: center;"> <span style="color:#b22222;"><strong><span style="font-size:14px;">  3.U肋板单元自动化焊接技?/span></strong></span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  在港珠澳大桥工程建设之前,我国钢桥制造行业的自动化水平较低,U肋板单元普遍采用导轮式角焊小车进行焊接,焊缝的质量稳定性欠佳?011年开始,国内各大钢桥制造厂通过技术引进与自主创新,全面升级钢箱梁板单元自动化焊接技术?/span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  ?)焊缝自动跟踪技?emsp;目前,U肋焊接的焊缝自动跟踪技术和方式主要有机械轮式、感应探头式和电弧传感式三种,其技术复杂度和焊缝跟踪精度依次提高?/span></p> <p> <span style="font-size:14px;">  </span></p> <p> <span style="font-size:14px;">  ?)自动化焊接装备 国内几大钢桥制造厂借鉴国外先进经验,自主开发了U肋板单元自动化焊接装备,其基本结构是在自行门架上安装多个焊接操作臂,形成了三种各有特点的U肋板单元自动化焊接方案。具体如下:一是以中铁山桥为代表的“焊接机器人+摇摆斜胎?rdquo;方案(见?a);二是以中铁宝桥为代表?ldquo;多头焊接专机+固定平胎架”方案(见?b);三是以武船重工为代表?ldquo;多头焊接专机+摇摆斜胎?rdquo;方案(见?c)。其?ldquo;摇摆斜胎架方?rdquo;具有“中国特色”,可使U肋角焊缝处于船形位焊接,有助于改善焊缝成形,“液压式板单元反变形角焊摇摆胎?rdquo;先由武船重工提出,于2006年申请了专利?/span><br />  </p> <p style="text-align: center;"> <span style="font-size:14px;">  <img alt="必读!中国正交异性钢桥面板U肋焊接创新之? src="/uploads/170907/8384-1FZG1015a26.png" style="width: 550px; height: 389px;" /></span></p> <p style="text-align: center;"> <span style="font-size:14px;">  (a)焊接机器人+摇摆斜胎?/span></p> <p style="text-align: center;"> <span style="font-size:14px;">  <img alt="必读!中国正交异性钢桥面板U肋焊接创新之? src="/uploads/170907/8384-1FZG1023DA.png" style="width: 550px; height: 366px;" /> </div> <ul class="zxmainpage"><li><a>?? </a></li><li><a href='#'>上一?/a></li><li class="thisclass"><a href='#'>1</a></li><li><a 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document.getElementById('commetcontent'); var waithtml = "<div style='line-height:50px'><img src='/images/loadinglit.gif' />评论加载?..</div>"; var myajax = new DedeAjax(taget_obj, true, true, '', 'x', waithtml); myajax.SendGet2("/plus/feedback_ajax.php?dopost=getlist&aid=17042&page="+page); DedeXHTTP = null; } function PostComment() { var f = document.feedback; var msg = CKEDITOR.instances.msg.getData(); var nface = '6'; var nfeedbacktype = 'feedback'; var nvalidate = ''; var nnotuser = ''; var nusername = ''; var npwd = ''; var taget_obj = $DE('commetcontentNew'); var waithtml = "<div style='line-height:30px'><img src='/images/loadinglit.gif' />正在发送中...</div>"; if(msg=='') { alert("评论内容不能为空?); return; } if(f.validate) { if(f.validate.value=='') { alert("请填写验证码?); return; } else { nvalidate = f.validate.value; } } if(msg.length > 500) { alert("你的评论是不是太长了?请填写500字以内的评论?); return; } if(f.feedbacktype) { for(var i=0; i < f.feedbacktype.length; i++) if(f.feedbacktype[i].checked) nfeedbacktype 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{ document.feedback.fid.value = fid; } function ajaxFeedback(aid, fid, type) { var taget_obj = $DE('ajaxfeedback_'+fid); if(taget_obj.innerHTML == '') { var myajax = new DedeAjax(taget_obj, true, true, '', 'x'); myajax.SendGet2("/plus/feedback.php?aid="+aid+"&fid="+fid+"&action=quote&type=ajax"); eval('var result = typeof CKEDITOR.instances.msg_'+fid); if(result != 'undefined') { // 删除实例 eval('var edit = CKEDITOR.instances.msg_'+fid); CKEDITOR.remove(edit); } CKEDITOR.replace(document.getElementById('msg_'+fid) , CKEDITOR.instances.msg.config); scroll(0, taget_obj.offsetTop - 120); var formname = 'f = document.ajaxfeedback_'+fid; eval(formname); if(f.validate) { if($DE('vdimg_'+fid)) $DE('vdimg_'+fid).src = "/include/vdimgck.php?"+f.validate.value; f.validate.value = ''; } DedeXHTTP = null; } } function ajaxQuotePost(fid) { var formname = 'f = document.ajaxfeedback_'+fid; eval(formname); //var f = document.formname; //var f = f[0]; var nvalidate = ''; var nnotuser = ''; var nusername = ''; var npwd = ''; var taget_obj = $DE('commetcontentNew'); var waithtml = "<div style='line-height:30px'><img src='/images/loadinglit.gif' />正在发送中...</div>"; eval('var msg = CKEDITOR.instances.msg_'+fid+'.getData()'); if(f.validate) { if(f.validate.value=='') { alert("请填写验证码?); return; } else { nvalidate = f.validate.value; } } var myajax = new DedeAjax(taget_obj, false, true, '', '', waithtml); if(f.notuser.checked) nnotuser = '1'; if(f.username) nusername = f.username.value; if(f.pwd) npwd = f.pwd.value; myajax.sendlang = 'utf-8'; myajax.AddKeyN('dopost', 'send'); myajax.AddKeyN('aid', '17042'); myajax.AddKeyN('fid', f.fid.value); myajax.AddKeyN('type', 'ajax'); myajax.AddKeyN('comtype', f.comtype.value); myajax.AddKeyN('isconfirm','yes'); myajax.AddKeyN('typeid', f.typeid.value); myajax.AddKeyN('quotemsg', f.quotemsg.value); myajax.AddKeyN('validate', nvalidate); myajax.AddKeyN('notuser', nnotuser); myajax.AddKeyN('username', nusername); myajax.AddKeyN('pwd', npwd); myajax.AddKeyN('msg', msg); myajax.SendPost2('/plus/feedback_ajax.php'); //alert(f.quotemsg.value); if($DE('ajaxfeedback_'+fid).innerHTML != null) { $DE('ajaxfeedback_'+fid).innerHTML = ''; } scroll(0, taget_obj.offsetTop); } LoadCommets(1); </script> <!-- //评论内容区结?--> </div> </div> <div class="zxmainr right"> <div class="zxmainbt"> <script src='/plus/abc_js.php?aid=8891' language='javascript'></script> </div> <div class="zxmaintj"> <div class="zxmainr_tit"><h3>精彩推荐</h3></div> <ul> <li><a href="/0jswx/b/20171117515.html">干货|一文搞定公路桥梁常见混凝土质量病害及对策措?/a></li> <li><a href="/0jswx/b/20171117458.html">给力!无损检测护卫"深海勇士"号载人潜水器,无损探伤人的?/a></li> <li><a href="/0jswx/b/20171017274.html">射线检测中如何甄别伪像?如何预防伪像出现?</a></li> <li><a href="/0jswx/b/20171017267.html">给力!风电机组关键部件叶片检测新技术问?</a></li> <li><a href="/0jswx/b/20170816856.html">浅析无损检测新技术“红外热像”的发展和应?/a></li> <li><a href="/0jswx/b/20170816832.html">干货|桥墩需要做什么措施?细数桥墩防车撞难?/a></li> <li><a href="/0jswx/b/20170515871.html">国内外钛合金棒材超声波检验标准分?/a></li> <li><a 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taget_obj = $DE('commetcontentNew'); var waithtml = "<div style='line-height:30px'><img src='/images/loadinglit.gif' />正在发送中...</div>"; if(msg=='') { alert("评论内容不能为空?); return; } if(f.validate) { if(f.validate.value=='') { alert("请填写验证码?); return; } else { nvalidate = f.validate.value; } } if(msg.length > 500) { alert("你的评论是不是太长了?请填写500字以内的评论?); return; } if(f.feedbacktype) { for(var i=0; i < f.feedbacktype.length; i++) if(f.feedbacktype[i].checked) nfeedbacktype = f.feedbacktype[i].value; } /* if(f.face) { for(var j=0; j < f.face.length; j++) if(f.face[j].checked) nface = f.face[j].value; } */ if(f.notuser.checked) nnotuser = '1'; if(f.username) nusername = f.username.value; if(f.pwd) npwd = f.pwd.value; var myajax = new DedeAjax(taget_obj, false, true, '', '', waithtml); myajax.sendlang = 'utf-8'; myajax.AddKeyN('dopost', 'send'); myajax.AddKeyN('aid', '17042'); myajax.AddKeyN('fid', f.fid.value); myajax.AddKeyN('face', nface); myajax.AddKeyN('feedbacktype', nfeedbacktype); myajax.AddKeyN('validate', nvalidate); myajax.AddKeyN('notuser', nnotuser); myajax.AddKeyN('username', nusername); myajax.AddKeyN('pwd', npwd); myajax.AddKeyN('msg', msg); myajax.SendPost2('/plus/feedback_ajax.php'); //msg = ''; CKEDITOR.instances.msg.setData(''); //taget_obj.removeAttribute('id'); f.fid.value = 0; if(f.validate) { if($DE('validateimg')) $DE('validateimg').src = "/include/vdimgck.php?"+f.validate.value; f.validate.value = ''; } } function quoteCommet(fid) { document.feedback.fid.value = fid; } function ajaxFeedback(aid, fid, type) { var taget_obj = $DE('ajaxfeedback_'+fid); if(taget_obj.innerHTML == '') { var myajax = new DedeAjax(taget_obj, true, true, '', 'x'); myajax.SendGet2("/plus/feedback.php?aid="+aid+"&fid="+fid+"&action=quote&type=ajax"); eval('var result = typeof CKEDITOR.instances.msg_'+fid); if(result != 'undefined') { // 删除实例 eval('var edit = CKEDITOR.instances.msg_'+fid); CKEDITOR.remove(edit); } CKEDITOR.replace(document.getElementById('msg_'+fid) , CKEDITOR.instances.msg.config); scroll(0, taget_obj.offsetTop - 120); var formname = 'f = document.ajaxfeedback_'+fid; eval(formname); if(f.validate) { if($DE('vdimg_'+fid)) $DE('vdimg_'+fid).src = "/include/vdimgck.php?"+f.validate.value; f.validate.value = ''; } DedeXHTTP = null; } } function ajaxQuotePost(fid) { var formname = 'f = document.ajaxfeedback_'+fid; eval(formname); //var f = document.formname; //var f = f[0]; var nvalidate = ''; var nnotuser = ''; var nusername = ''; var npwd = ''; var taget_obj = $DE('commetcontentNew'); var waithtml = "<div style='line-height:30px'><img src='/images/loadinglit.gif' />正在发送中...</div>"; eval('var msg = CKEDITOR.instances.msg_'+fid+'.getData()'); if(f.validate) { if(f.validate.value=='') { alert("请填写验证码?); return; } else { nvalidate = f.validate.value; } } var myajax = new DedeAjax(taget_obj, false, true, '', '', waithtml); if(f.notuser.checked) nnotuser = '1'; if(f.username) nusername = f.username.value; if(f.pwd) npwd = f.pwd.value; myajax.sendlang = 'utf-8'; myajax.AddKeyN('dopost', 'send'); myajax.AddKeyN('aid', '17042'); myajax.AddKeyN('fid', f.fid.value); myajax.AddKeyN('type', 'ajax'); myajax.AddKeyN('comtype', f.comtype.value); myajax.AddKeyN('isconfirm','yes'); myajax.AddKeyN('typeid', f.typeid.value); myajax.AddKeyN('quotemsg', f.quotemsg.value); myajax.AddKeyN('validate', nvalidate); myajax.AddKeyN('notuser', nnotuser); myajax.AddKeyN('username', nusername); myajax.AddKeyN('pwd', npwd); myajax.AddKeyN('msg', msg); myajax.SendPost2('/plus/feedback_ajax.php'); //alert(f.quotemsg.value); if($DE('ajaxfeedback_'+fid).innerHTML != null) { $DE('ajaxfeedback_'+fid).innerHTML = ''; } scroll(0, taget_obj.offsetTop); } LoadCommets(1); </script> <div id="footerbg"> <div id="footer"> <p class="nomar"> <a href="http://www.chinatesting.com.cn/danye/gywm.html">关于我们</a> | <a href="http://www.chinatesting.com.cn/danye/lxfs.html">联系方式</a> | <a href="http://www.chinatesting.com.cn/danye/ggfw.html">广告服务</a> | <a 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