拱顶的焊接工艺

拱顶的焊接工艺8Weldingofvault8.1拱顶的安装是在罐壁顶圈壁板已安装焊接的条件下进行的。顶圈壁板焊接完成后，进行坠板的焊接。8.1domeisinstalledinthetankwallunderthetopringwallinstalledweldingcarriedout.Afterthetopringwallweldingiscompleted,performfallplatewelding.8.2拱顶板与加强筋预制完成后，在预制场完成拱顶板与加强筋的焊接工作。然后在临时支撑安装完成后，将拱顶板与加强筋的预制件整体吊装在临时支撑上进行预制焊接。8.2domeplateandstiffenerprefabricated,precastyardcompletioninthedomeplateandstiffenerweldingwork.Afterthetemporarysupporttheninstallationiscomplete,thedomeplateandstiffenerpreformsintegralliftingprefabricatedweldedontemporarysupport.8.3已安装的拱顶的焊接程序为：先焊接扇形大板间的纵向焊缝，再焊接中心板与各扇形大板内沿间的环缝，后焊接扇形大板外沿与罐壁环形角钢圈间的环缝。拱顶的焊接拟采用二氧化碳保护焊，纵向缝施焊时宜由多名焊工采用跳焊法对称同时焊接；外沿环缝施焊时宜由多名焊工均布，同时沿同一方向焊接。8.3Domeweldingproceduresinstalledasfollows:firstlongitudinalseamweldedlargesectorbetweentheplates,centerplateandthenweldedineachsectorgirthalongtheboardbetweentheouteredgeoftheboardaftertheweldingsectorwiththetankwallringanglegirthringbetween.Domeweldingintendstousecarbondioxidearcwelding,longitudinalweldingseamwelderwhenadvisedbyanumberofsymmetricskipweldingSimultaneouswelding;seamweldingattheouteredgeoftheringshouldbeevenlydistributedbyanumberofwelders,weldingsimultaneouslyinthesamedirection.

8.4顶板在设置短桅杆部分预留出1000*1000mm的空间，待罐顶提升高度超过桅杆高度后补设安装完成8.4Aspaceof1000x1000mmshouldbereservedattheshortmastpartofthetopplate.Thereservedspaceshouldnotbein