2019Case2GRAHAM

16 L EAN C ONSTRUCTION I RELAND A NNUAL B OOK OF C ASES 2019 Case 2 – GRAHAM The company works on building, civil engineering, and fit-out projects for both public and private sector clients across the UK and Ireland and i s currently delivering more than 100 projects. GRAHAM has off ices in Dublin, Belfast, London, Edinburgh, Glasgow, Manchester, Leeds , Birmingham, Hillsborough, Aberdeen, Dumfries, Durham, Cambridge, St Albans, and Bristol. To align with our guiding principle of “delivering lasting impact”, along with our culture of finding a better way we are focused on improving productivity, reducing error and embracing modern methods of construction to create a business which has a positive influence on the planet. We have delivered a number of iconic projects in Ireland including the Samuel Beckett bridge over the River Liffey in Dublin. GRAHAM currently employ over 2000 employees across the business. C O M P A N Y W E B S I T E OVERVIEW & BACKGROUND TO THE LEAN INITIATIVE GRAHAM’s Travis Brow Link Road project has been described by Tim Lawton, TCAP Project Director, as “probably the single most important new strategic highways connection in Stockport”. Awarded through Highways England’s Col laborat ive Del ivery Framework, this GBP£8Million project has delivered a new 400-metre long link road including retaining wal l s supporting the Grade II listed Stockport Viaduct dating back to the 1840s that carries the West Coast railway line. Figure 1. Project Scheme The project received the CIHT (Chartered Institution of Highways and Transportation) Northwest Project of the Year Award which stood out due to GRAHAM’s intelligent design solution enabling a two-lane dual-carriageway to be formed through a single arch, and significantly improved access to and around Stockport, to the M60, the railway station, and to key sites within the town centre. It includes a series of highway improvement works along Travi s Brow, George’s Road, and Wellington Road North. This Project’s major works included road cutting up to 12m deep with various geotechnical structures including soil nailed 1V:1H slopes, concrete gravity retaining walls, cantilevered and anchored contiguous piled walls to 8m in height, and pre- stressed rock anchors. The soil nailing became a critical path activity due to dependencies on other contractors’ ability to mobilise and start work on time or early within their retrospective sections. Lean work studies were conducted to improve the product ivi ty of soi l nai l ing which projected the programme and provided further efficiencies. LEAN INITIATIVE UNDERTAKEN – LEAN THINKING, TOOLS, TECHNIQUES www.graham.co.uk AUTHORS Katie Jones Soil nailing is an efficient construction solution to prevent horizontal movement in unstable soil slopes and retain earth that will steepened. The technique utilises hollow bars which are drilled and grouted simultaneously by the use of a sacrificial drill bit and by pumping grout down the hollow bar as drilling progresses. Equipment Used The equipment used was a drilling rig excavator mounted feedbeam and telehandler used to deliver the soil nails to the works area. The Travis Brow soil nailing design consists of 555 soil nails varying from 3m to 7m in length. The maximum height from ground level is 6m. Lean Methodology The Lean soil nailing work study followed the DMAIC COMPANY OVERVIEW Luke Kolakowski Figure 2. Drawing of Soil Nailing Requirements