Britflex BEJ Expansion Joints - StonCor Africa

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USLBridgeCareBritflex BEJExpansion JointsFigure 4 Alternative at kerbline or into parapet recessStitch welding(intermittent)Figure 6Figure 5 Alternative at change on planDesign detailOther Applicationsa) CarriagewayIn new works or whenre-surfacing in maintenanceschemes, it is necessaryto temporarily cover theexpansion gap to preventingress of materials into thedeck expansion gap. Any suchcoverings should be easilyremoved when the trench isexcavated for the joint.Temporary saw-cuts into thenewly laid surfacing abovethe deck expansion gap maybe required if appreciabledeck movement is predictedafter surfacing and beforejoint installation. This may notbe necessary when the jointis installed shortly after thesurfacing is laid.b) VergesGranular verge and centralreserve construction immediatelyadjacent to the joint is notrecommended.06A concrete verge infill isrecommended adjacent to thejoint and a trench should beformed to accommodate therequired joint width.If flexible surfacing is requiredover any verge concretethe prepared trench may betemporarily backfilled and theposition of the trench referencedon the kerb and parapet by themain contractor.Any newly placed concreteshould be nominally seven daysold and cured in accordancewith the contract. Concrete of atleast grade 30 is recommended.c) Service DuctsAny service ducts passingthrough the joint should beproperly sleeved to preventleakage and articulated to theEngineers details.Ducts and sleeves may be inuPVC or other similar materialsprovided they do not appreciablysoften below 80ºC. Cablesshould not be drawn until afterthe joint is installed, if at allpossible.Ducts/sleeves through the‘Britflex BEJ’ require a minimumof 50mm clearance abovethe deck and spaced 125mmbetween each other to allowcontinuity of the resin mortarmaterial. Where there are 4 ormore ducts present in any oneverge/footway further adviceshould be sought from a USLtechnical advisor.d) KerbsKerbs should be laid startingflush with and working away fromthe expansion gap. The kerbs aresaw cut to the appropriate trenchwidth and removed during thejoint installation.Proprietary continuous kerblineside entry gully systems may beused in conjunction with theBEJ Expansion Joint. Expansionunits are available which arecompatible with the BEJ system.Advice should be sought fromUSL or the manufacturers ofthe side entry gullies at thedesign stage.e) Footway AreasKerb cover plates or footwaycover plates can be provided asan optional addition. The USLTechnical and Advisory Serviceshould be consulted regardingtheir inclusion.i) As an improvement overasphaltic plug joints for lowmovement joints in heavilytrafficked areas. On heavilyskewed joints or steeply gradedcarriageways however, the NJsystem may prove to be moresuitable (see NJ literature formore information).ii) As a longitudinal joint betweentwo deck halves however, the LJsystem may be more suitable (seeLJ literature for more information).iii) On building structures, car parksand elevated ramps with a needfor heavy duty expansion systems.iv) On marine quayside structuresv) On footbridges, however the UCPsystem may be more suitable.vi) Britflex Resin Mortar may beused for new and replacementtransition strips to elastomericjoints and general carriagewayironmongery. It may also be usedas a transition to the metalworkof existing proprietary expansionjoints where the adjacent surfacingis distressed.
Figure 8Aluminium five bartread pattern kerbcover plateFigure 7Nosing recessedand to matchkerb faceDBBWDPlanResinnosingSpecification for The ‘BEJ’ Expansion JointMaterialsi) Polyureide ResinThe Britflex PolyureideResin is a two part liquidsystem comprising one clearcomponent (Base) and oneblack (Hardener). Packed incolour coded drums.ii)AggregateThe aggregate is a gradedmix supplied in 20kg sealedplastic bags.iii) Carrier RailsThe metal rails are suppliedin either mild steel toEN10025:2004 GradeS355J0 with factory appliedcorrosion protection.Stainless steel rails areavailable at an additionalcost. The rails are nominally25mm wide x 48mm deepwith welded sinusoids toprovide anchorage into theBritflex Resin Mortar. Therails are generally delivered in7500mm lengths and cut tolength on site.For special applications a25mm wide x 43mm deepcarrier rail is available.iv) Kerb UnitsThe metal carrier rails are cut,mitred and welded on site, tosuit the kerb upstand detail.v) Elastomeric InsertThe extruded EPDM insertis available in varioussizes, each capable ofaccommodating a differentrange of movement. Theinserts are supplied in coils oflengths between 25 to 60m.vi) Hydraulic ReliefStandard hydraulic reliefchannel is 20 x 20mm squarealuminium tubing, in 5metre lengths. The channelhas 11mm diameter holesdrilled on one face at 90mmnominal centres.If specified, the channel isinstalled to the deck side ofthe joint along the carriagewaylength.vii) Discharge TubeWhen an in-joint hydraulicrelief channel is specified,this is terminated witha braided PVC flexibletube with a 25mm internaldiameter (32mm externaldiameter), discharging to asuitable collection point.viii) Polystyrene25mm and 50mm sheets ofexpanded polystyrene are cutto size to form a temporaryshutter in the expansion gapbetween the nosings and alsoin the kerb area.ix) Spacer PlatesThe spacer plates set the railsat the appropriate gap settingduring installation.They are available in 5mmincrements.x) Strongbacks/HangersThe spacer plates areconnected to the hangerswhich suspend the railsover the expansion gap atcarriageway level.xi) Kerb/Footway Cover Plates(Optional Additions)These may be suppliedfabricated from 4.5mm thickaluminium plate with five bartread pattern.07
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Britflex BEJ Expansion Joints - StonCor Africa

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