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ALL ABOUT ERECTION

Erection is the process of erecting or connecting together the shipping pieces in the field at the project site. Generally columns get erected first, then trusses and major girders, then beams, bracing, stairs and other miscellaneous steel. for more details visit us on https://axtella.co.in/

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ALL ABOUT ERECTION

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  1. ALL ABOUT ERECTION

  2. Erection is the process of erecting or connecting together the shipping pieces in the field at the project site. Generally columns get erected first, then trusses and major girders, then beams, bracing, stairs and othermiscellaneoussteel. Thesuccessoferectionisdependentonafewimportantfactors. In structural steel detailing services most critical element is erection of the columns. Column base plates are connected to the foundation usinganchorboltsplacedintheconcretebythefoundation contractor.The location of the anchor bolts (usually four or more) for a single column in the foundation must match exactly the pattern of bolt holesinthebaseplateofasinglecolumn.

  3. Moreover, because it is more economical to erect frames comprised ofmultiplecolumnsheldtogetherwithbeams andbraces,ratherthan individual columns, the spacing between anchor bolt groupings must line-up exactly with the location of the columns. In the real world bolt whole patterns in base plates often do not match the anchor bolt locations.Also, the centrelines of columns often do not line up with the centreline of the anchor bolt grouping. To prevent these errors, fabricatorsusuallyinsistonasurveyoftheanchorboltlocationsprior tofabricatingbaseplatesandframes.Anothermethodofmitigating

  4. the tight tolerances is for the foundation contractor and the fabricator to use templates to insure an exact match. Another critical element of erection is crane access and movement. Steel is erected using one or morecranes,usuallymorethanone. Typicallyafewdifferenttypesofcranesareusedforsteelerection tower cranes, crawler cranes and hydraulic cranes. Tower cranes are those large T-shaped, counterbalanced configurations used to erect multi-storystructuresandcapableofheavylifts. Thesecranesrotateaboutasinglepoint and arecapableofliftingsteel anywherewithintheradiusofthetowerarm.Crawlercranesaremobile

  5. and move around the site to make the necessary steel “picks.” Hydraulic cranes tend to be smaller, more mobile, and are used for lighter loads. Crane movement is animportant consideration inthe constructibility review of a project. Erectors usually divide the job into phases based on the anticipated movements of the cranes. For the sake of efficiency the fabricator usually fabricates the job in these same phases so that the erector has the necessary steel for a single phase (or area)1. One or more of these cranes may be designated for unloading steel when it shows up atthejobsite.Onmostprojects,theerection processstartswith unloading the shipping pieces using one of several cranes usually on the site.Sometimesshippingpiecesareerectedintotheshippingpiecesare

  6. erectedintotheframeworkdirectlyfromthetruck;othertimespiecesmust beplacedfirstinastagingareaforlatererection 1.Whenpreparinganas-builtscheduleforsteelactivities,onecanusually ascertain the actual dates for the erection of steel by analyzing crane movement– adescriptionofwhichshouldbedetailedonadaily constructionreport. Other structural steel detailing erection activities include plumb and bolt, safety, welding, decking, and buttoning-up. Plumb and bolt is the process of placing the steel assemblies in their proper location, aligning them and temporarilyboltingtheminplace(boltsarenottypicallytorqued

  7. to their final state until a majority of the area or frame has been erected). Safety is anactivity performed by aseparate crew that installs cable handrailsandothersafetydevicesinanareabeforetheironworkersbegin towork. Thisallows the ironworkersto move freely fromoneareato another without interruption. A welding crew or multiple welding crews are then responsible for final welding of all the assemblies in accordance with the erection drawings. A bolting crew may also be utilized. Decking is the process of placing corrugated bent plate on the structural frame to later acceptcast-in-placeconcretetoformaslab.Deckingisastructural elementformedbybendingplateintoacorrugatedshape.

  8. Theheightordeepnessofthecorrugations andthelengthandfrequencyof thecorrugationsdeterminethedecking’sstrength. Oftentimes the erector will contract with a second tier contractor to design, detail, fabricate and erect the deck. Included in the decking erection activity istheinstallationofstudsthatweldtothedeckforthepurposeof mechanically fastening the poured-in-place concrete to the deck forming a monolithic(composite)structuralelement.Sectionoftwo-levelslab illustratingmainsteelbeams,deckingandstuds.

  9. The corrugations of the decking run perpendicular to the beams. NoticehowthisstructuralsectionofAxtellastructuresis referencing architectural drawings for dimensional information. Details regarding beam sizes, connections, stud locations, rebar placement,etc.arecontainedonotherdrawings.Thefinal torquingof bolts,weldingofdeck,installationofstairs,and installationofstudsisanactivitycommonlyreferredtoas buttoning-up.

  10. FORMOREDETAILS Address:D-77, Noida Sector63 PinCode:201301 phoneno:9034380905,857204533 VISITON:https://axtella.co.in

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