Module 16 Workshop – Designing Solutions Alastair de Beer, TII Group Work • 5 Groups • 15 minutes Questions: • What is wrong with installation or design • 3 Solutions required for each problem Solutions • 5 minute Feedback from each group Barrier 1 Problem 1 Problem 1 Mainline Angle of impact Unprotected hazards Problem 1 Side Road Slope within w/w Hazard within w/w Solutions? • Remove barrier and lighting columns? • Concrete barrier on mainline and flatten land behind it. • Redesign slip road to be at same level as mainline Barrier 2 Not structural No transition No transition Solutions? • Speak to TII Bridge Manager? • Could masonry parapet be removed? • Could a concrete pillar be constructed upstream of the parapet? • Not enough space for barrier over structure? • Crash cushion in advance of parapet? Barrier 3 No working width behind barrier No approach length No terminal No anchorage Solutions? • • • • Construct reinforced concrete wall with stone cladding Taper end of wall away from road Precast kerb (N1 Containment) with delineation on top H2 steel barrier or timber barrier (may not have correct working width for HGV but will work for car) Barrier 4 Bent barrier will not work No Anchorage Protecting Lighting columns only Solutions? • Remove Barrier and replace lighting columns with passively safe columns (Same price as existing columns) • Taper end of barrier at 1:20 away from road Barrier 5 No working width behind barrier Rails of fence Solutions? • Increase width of verge and move fence back • Apply for departure to use a rail‐less fence within the working width • Have buried attenuation area and remove fence and barrier Additional Discussion Issues Thank you Alastair de Beer Alastair.debeer@tii.ie