DS/CSB/513

THE KNOWLEDGE Issue No 03 Issue Date July 09

Concrete Step Barrier Design Guidance Emergency and Maintenance Crossing Points Emergency and Maintenance Crossing Points

DRAWINGS SSB/002 SSB/010 SSB/200 SSB/201 SSB/204

APPLICATIONS

• Emergency Crossing Points (ECP) • Maintenance Crossing Points (MCP) and Maintenance Access

Figure 1

Typical ECP installation

Design Guidance Notes Layout

A demountable version of the Steel Step Barrier (DSSB) is The layout options for ECPs and MCPs using DSSB are used at Emergency Crossing Points (ECP) and can also be limited by the length of the individual units available. installed at Maintenance Crossing Points and Maintenance SSB to CSB connection units are 500 mm long. Access (MCP). The barrier is anchored to the surfacing Standard sections of SSB/DSSB are 5450 mm long. using removable anchors and is equipped with retractable Special sections can be manufactured to suit any opening. wheels. Figure 1 shows a typical installation When designing ECPs and MCPs, the expansion of the units The SSB and DSSB are approved for use by the Highways must be considered; expansion can be accommodated by Agency and conform to BS EN 1317 Parts 1 & 2¹ connection plates with slotted bolt holes. (Containment Performance Class H2, Working Width W2). The barrier meets the requirements of IAN 68², section

3.4.8. Note the requirements of TD 19³ relax the 1 BS EN 1317: Restraint Systems requirements for opening ECPs and MCPs. Part 1: terminology and general criteria for test methods Part 2: Performance classes, impact test acceptance criteria and test methods for safety barriers ² Interim Advice Note 68/06: Infrastructure changes to improve emergency access to and egress from the network In England. ³ TD19 Requirement for Road Restraint Systems 4 Signs Manual (TSM) Chapter 8 (layout No. 34)

CONCRETE STEP BARRIER Design Guidance DS/CSB/513 Emergency and Maintenance Crossing Points Prepared for Britpave by Arup E-mail [email protected] Facsimile 01276 33160 Website www.britpave.org.uk Emergency and Maintenance Crossing Points DS/CSB/513 Britpave Riverside House, 4 Meadows Business Park, Station Approach, Blackwater, Camberley, Surrey GU17 9AB Configuration ofDSSBunitsatECP Prepared for Britpaveby Arup CONCRETE STEPBARRIERDesign Guidance the DSSBunitstobemovedbyhandwhenopeninganECP. of thesurfacingiscritical,asitdirectly affectstheabilityof ±5 mm,alongthelengthofECP. tolerance Thevertical 900 mmabovetheroad toleranceof surface,withavertical conditions andexpectedvehicletypes. analysis todeterminethedimensionsrequired tosuitlocal The designershouldcarryouttheappropriate sweptpath Figure 3,incorporatinganemergency area. A typicallayoutbasedonIAN68/06isillustratedin units (22840mm)long(Figure 2). ECPs willtypicallybeeitherthree units(17380mm)orfour Emergency Crossing Points bolts. are secured horizontally intoadjacentCSBwith4No.M20 Grade 70stainlessboltsfixedvertically. Connection units (or similarapproved products) and4No.M20x150mm Rn grade80stainlesssocketswithHiltiHVU resin capsules secured intothepavement using4No.HiltiHIS- vertically DSSB unitsare mountedonretractable wheelsandare weigh 85kg. the DSSBunitsweigh850kgandconnection They require unloadingusingeitheraforklifttruckorcrane; The unitsare prefabricated anddelivered tositebylorry. Installation The heightofthebarriershallbeanominal Tolerances Typical ECPlayout Figure 3 Figure 2 CSB CSBC CSBC SSB Emer 22840 17380 SSB SSB gency T urnar ound Ar CSB ea SB SB

also becompletedinunder30minutes minutes. Reinstatement oftheunitstocloseECPcan Removal oftheunitstoopenanECPrequires lessthan30 correct torque. on reinstatement, allboltsshouldbetightenedtothe carried outinaccordance withmanufacturer’s instructions; The removal andreinstatement oftheunitsshouldbe (Figure 5). units provide accesstotheanchorsandretractable wheels Hatches inthesidesofDSSBunitsandconnection Opening ECP equipped withhandtools(Figure 4). An ECPcanbequicklyopenedbyatwo-manteam, Opening anECP (TSM) SSDs anddesignspeed.BasedontheTraffic SignsManual calculated foreachspecificlocation,tosuitgeometry, The lengthofbarrieropeningfortheMCPneedstobe Maintenance Access Maintenance Crossing Points and required. whentheMCPisnolonger of CSBcanthenbeinserted breaking out CSB and removing the debris. An in situlength contra-flow. Itisrecommended thattheMCPiscreated by Access hatchinDSSBunit Figure 5 Figure 4 DS/CSB/513 4 , MCPs are typically200to250mlongfora2- Emergency andMaintenance Crossing Points Issue DateJuly09 THE KNOWLEDGE Issue No03