Anchor Bolt
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3/30/2015 Anchor bolt Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Anchor_bolt 1/3 A castinplace anchor bolt Anchor bolt From Wikipedia, the free encyclopedia An anchor bolt is used to attach objects or structures to concrete. There are many types of anchor bolts, consisting of designs that are mostly proprietary to the manufacturing companies. All consist of a threaded end, to which a nut and washer can be attached for the external load. [1] Anchor bolts are extensively used on all types of projects, from standard buildings to dams and nuclear power plants. [2] They can also be used to firmly affix embed plates to a concrete foundation when used with a structural steel element. [3] The simplest anchor bolt is a castinplace anchor. As seen in the figure, most designs consist of a standard bolt with a hexagonal head, which is cast in the wet concrete before it sets. There are other designs, some consisting of a bent bolt with a hook on the end, or some other sort of bending. Castinplace anchor bolts are the strongest type of fastener, but the casting is difficult, and they are usually only used for heavy machines mounted on poured concrete floors. Another use of this anchor bolt is to connect the concrete foundation of a building to its wall. With this, the building is more resistant to earthquakes. Currently there are several devices to assist in holding and in placing anchor bolt to set in the concrete. These devices mostly made from composite plastic. Once the concrete has been poured and set, the only other types of bolts that can be used are mechanical and epoxy bolts. Epoxy bolts are the strongest, but can be very tricky to install, since the epoxy has to be mixed to exact specifications, the hole must be very clean, and the set time has to be watched. As well, there must be a rigorous testing program. In Boston's Big Dig project, these procedures were not well carried out, which resulted in a large concrete slab crushing a motorist. A concrete screw is another way of attaching things to concrete that has already been poured and set. Contents 1 Wedge anchors 2 Gallery 3 See also 4 References 5 External links Wedge anchors
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This document gives definition of anchor bolts, types of anchors and references to various documents available online.
Transcript of Anchor Bolt
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3/30/2015 AnchorboltWikipedia,thefreeencyclopedia
http://en.wikipedia.org/wiki/Anchor_bolt 1/3
Acastinplaceanchorbolt
AnchorboltFromWikipedia,thefreeencyclopedia
Ananchorboltisusedtoattachobjectsorstructurestoconcrete.Therearemanytypesofanchorbolts,consistingofdesignsthataremostlyproprietarytothemanufacturingcompanies.Allconsistofathreadedend,towhichanutandwashercanbeattachedfortheexternalload.[1]Anchorboltsareextensivelyusedonalltypesofprojects,fromstandardbuildingstodamsandnuclearpowerplants.[2]Theycanalsobeusedtofirmlyaffixembedplatestoaconcretefoundationwhenusedwithastructuralsteelelement.[3]
Thesimplestanchorboltisacastinplaceanchor.Asseeninthefigure,mostdesignsconsistofastandardboltwithahexagonalhead,whichiscastinthewetconcretebeforeitsets.Thereareotherdesigns,someconsistingofabentboltwithahookontheend,orsomeothersortofbending.Castinplaceanchorboltsarethestrongesttypeoffastener,butthecastingisdifficult,andtheyareusuallyonlyusedforheavymachinesmountedonpouredconcretefloors.Anotheruseofthisanchorboltistoconnecttheconcretefoundationofabuildingtoitswall.Withthis,thebuildingismoreresistanttoearthquakes.Currentlythereareseveraldevicestoassistinholdingandinplacinganchorbolttosetintheconcrete.Thesedevicesmostlymadefromcompositeplastic.Oncetheconcretehasbeenpouredandset,theonlyothertypesofboltsthatcanbeusedaremechanicalandepoxybolts.Epoxyboltsarethestrongest,butcanbeverytrickytoinstall,sincetheepoxyhastobemixedtoexactspecifications,theholemustbeveryclean,andthesettimehastobewatched.Aswell,theremustbearigoroustestingprogram.InBoston'sBigDigproject,theseprocedureswerenotwellcarriedout,whichresultedinalargeconcreteslabcrushingamotorist.
Aconcretescrewisanotherwayofattachingthingstoconcretethathasalreadybeenpouredandset.
Contents
1Wedgeanchors2Gallery3Seealso4References5Externallinks
Wedgeanchors
http://en.wikipedia.org/wiki/Structureshttp://en.wikipedia.org/wiki/Big_Dig_(Boston,_Massachusetts)http://en.wikipedia.org/wiki/Concrete_screwhttp://en.wikipedia.org/wiki/Washer_(mechanical)http://en.wikipedia.org/wiki/File:Anchor_bolt_in_concrete.jpghttp://en.wikipedia.org/wiki/Concretehttp://en.wikipedia.org/wiki/Epoxyhttp://en.wikipedia.org/wiki/Propertyhttp://en.wikipedia.org/wiki/Nut_(hardware)
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3/30/2015 AnchorboltWikipedia,thefreeencyclopedia
http://en.wikipedia.org/wiki/Anchor_bolt 2/3
Awedgeanchor
WikimediaCommonshasmediarelatedtoAnchorbolts.
Wedgeanchors,alsoknownasredheadbolts,expansionboltsandexpansionanchors,securethemselvesusingamechanicalwedgingeffectattheendofthefastener.Therearethreebasicstylesofwedgeanchors:fullythreaded,partialthreadedandthefullbodiedwedgeanchor.[4]Asshowninthefigure,tighteningtheboltresultsinawedgebeingdrivenupagainstasleeve.Thisjamstheendofthebolt,andprovidesthestrength.Manydifferentmanufacturersprovideavariationonthistheme,usuallydependingontheconditionoftheconcrete,andthetypeofload.Ifamechanicalanchorfails,itisusuallyintheformofpullingoutawedgeofconcrete,andforthisreason,properdesignlooksatthedepthofembedmentandensuresthattheboltsarenotspacedtooclosely.
Aspecializedformoftheanchorboltistherockbolt,usedinrockexcavations.Inmanypartsoftheworldseismicanchorsareanotherspecializedsubject.[5]
Gallery
Seealso
Screwanchor
References
1. http://www.gobrick.com/BIA/technotes/t44.htm2. "Whereanchorboltsareused"
(http://www.usbr.gov/pmts/materials_lab/anchor/failure.html).USBureauofReclamation.RetrievedNovember2010.
3. AnchorBolts(http://www.pipingtech.com/technical/pipesupportglossary.htm#ANCHOR%20BOLTS)PipingTechnology&Products,(retrievedMay2012)
4. "FinePointsonSelectingandInstallingWedgeAnchors"(http://www.concretefasteners.com/diyarticles/selectinginstallingwedgeanchors.aspx).ConcreteFastener.RetrievedNovember2010.
5. http://web.archive.org/web/20080408144424/http://www.ce.berkeley.edu/~epp/clad/node3.html
http://www.concretefasteners.com/diy-articles/selecting-installing-wedge-anchors.aspxhttp://en.wikipedia.org/wiki/Rock_bolthttp://www.pipingtech.com/technical/pipe-support-glossary.htm#ANCHOR%20BOLTShttp://en.wikipedia.org/wiki/File:Ancor_bolt_for_concrete.JPGhttp://en.wikipedia.org/wiki/File:Fischer_FH.jpghttp://en.wikipedia.org/wiki/File:Betonanker.jpghttp://en.wikipedia.org/wiki/Seismichttp://en.wikipedia.org/wiki/File:Metall-Fensterrahmend%C3%BCbel_F10_M132_1756.JPGhttp://commons.wikimedia.org/wiki/Category:Anchor_boltshttp://en.wikipedia.org/wiki/File:Expansion_bolt_cutaway.jpghttp://en.wikipedia.org/wiki/Screw_anchorhttp://www.gobrick.com/BIA/technotes/t44.htmhttp://en.wikipedia.org/wiki/Wedge_(mechanical_device)http://web.archive.org/web/20080408144424/http://www.ce.berkeley.edu/~epp/clad/node3.htmlhttp://www.usbr.gov/pmts/materials_lab/anchor/failure.html
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3/30/2015 AnchorboltWikipedia,thefreeencyclopedia
http://en.wikipedia.org/wiki/Anchor_bolt 3/3
Externallinks
"BoltExpandsinConcretetoAnchorFixtures"PopularMechanics,February1935(http://books.google.com/books?id=yN8DAAAAMBAJ&pg=PA224&dq=Popular+Science+1935+plane+%22Popular+Mechanics%22&hl=en&ei=t_c0TqiZF6rsALn6bXtCg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCgQ6AEwADgK#v=onepage&q&f=true)bottomleftpg.224
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Categories: Screws Structuralconnectors Fasteners
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