Partnering Pays Off for M1 Barrier Work
Total Page：16
File Type：pdf, Size：1020Kb
Newsletter Early Summer 2004 9 Tenth Anniversary for Highways Agency Partnering pays off This year the Highways Agency celebrates its 10th anniversary as for M1 barrier work provider of the major roads network. This consists of 5,130 miles of Refurbishment works to the M1 motorway motorways and trunk roads. The between junctions 1 and 2 included the Agency has an annual programme installation of around 2,100 m of in-situ budget of £1.6bn, of which some £500 concrete barrier, the majority of which was million is spent on major improvements high containment (H4a), located in the verge. to the network. The project, undertaken on behalf of The English strategic road network is the Highways Agency and managed by Mouchel, largest single Government asset, valued was awarded to Tarmac National Contracting at £65bn. It carries one third of all road just before Christmas, with a start on site traffic in England and two thirds of all around the middle of February, and all work heavy freight traffic, with more than to be completed by end of March. The 170 billion vehicle kilometre journeys quantity and duration of the concrete barrier undertaken every year. work meant that its construction was on the critical path of the entire project The current programme contains more programme. than 70 major schemes, each over £5 million. The specialist slipform paving subcontract works were awarded to Extrudakerb and Schemes due to start in 2004 – 05 detailed planning and preparation work was A63 Melton Junction, East Yorkshire undertaken between subcontractor, main A5 Weeford Fazeley Improvement, Staffordshire contractor and project manager to explore A421 Great Barford Bypass, Bedfordshire new avenues in an effort to provide rates of A14 Rookery Crossroad, Suffolk production never previously achieved. Slipforming vertical concrete safety barrier on the M1 refurbishment work. A47 Thorney Bypass, Peterborough Extrudakerb realised that the appointment M4 Junction 18 Eastbound Diverge, Bristol/South of a concrete supplier who understood the were consistently achieved, peaking at Gloucestershire demands of the slipform process, and 134 m3 within an eight hour paving shift. M5 Junction 17 – 18 Northbound Climbing Lane specifically those associated with high barrier All barrier was constructed within tolerance A249 Iwade-Queenborough Improvement (DBFO), paving, was critical to the success of the and no remedial works were required, a Kent project. RMC Readymix was awarded the testimony to the success of the partnering contract to supply the 3,500 m3 of C28/35 Schemes due to finish 2004 – 05 achieved between subcontractor and air-entrained concrete required from their A10 Wadesmill Colliers End Bypass, Hertfordshire concrete supplier. Wembley plant. A120 Stansted-Braintree, Essex A21 Lamberhurst Bypass, Kent For the first time the concrete base and In light of the projected increase in A34 Chievely/M4 Junction 13 Improvement, haunch, below and at the back of the barrier, demand for concrete barrier across the road Berkshire was slipformed, enabling high production network, Highways Agency should take A63 Selby Bypass, North Yorkshire rates to be achieved at high tolerance and comfort from the fact that industry is clearly demonstrating both a desire and an ability A2 Bean Cobham Phase 1, Kent avoiding the time consuming and costly follow-on works of hand laying the verge to meet demand and deliver a quality A1 Stannington Junction, Northumberland side haunch after barrier construction. product at high rates of production. Schemes completed 2003 – 04 However restricted working space dictated For more information contact that some lengths had to be hand laid. A500 Basford, Hough, Shavington Bypass, [email protected] Staffordshire Extrudakerb provided two four-track A46 Newark-Lincoln Improvement, Lincolnshire Gomaco Commander III slipform pavers to A6 Rothwell-Desborough Bypass, which paving moulds can be mounted to the Northamptonshire Diary Dates left or right side, allowing both verge and A6 Rushden and Higham Ferrers Bypass, central reservation works to progress in the Annual General Meeting Northamptonshire same direction as adjacent traffic flow, 11.30 am, 10 June A41 Aston Clinton Bypass, Buckinghamshire avoiding the need to turn around concrete Novotel, Euston, London A1033Hedon Road Improvement, Kingston Upon Hull delivery wagons. Britpave Conference 2004 A6 Alvaston Bypass, Derbyshire 27 & 28 September A650 Bingley Relief Road, West Yorkshire The careful planning and pre-start meetings paid off; record rates of production Belton Woods Hotel, Grantham www.britpave.org.uk 1 Local aggregates Preparing for increase sustainability the big bird for Jersey Airport By the time the first A380 lands at Heathrow in spring 2006, many of its taxiways will have been widened and repositioned, both of its two runways lengthened, and entire pier redeveloped and aircraft stands modified to accommodate the larger aircraft. The £430 million project, which will last three years, got underway with the redevelopment of two taxiways adjacent to the southern runway, when AMEC began widening and repositioning them to accommodate the new aircraft’s 80 m Jersey Airport, before and after completion of the new taxiway wingspan. Working in small sections to keep Taxiway Alpha at Jersey Airport was of • Pavement quality concrete (PQC) of diversions to a minimum, AMEC is replacing inadequate strength and had became higher strength than previously used 150,000 m2 of concrete pavement with new uneconomic to maintain. Additionally, it pavement quality concrete. As the airport is • High modulus bituminous material. was not far enough from the runway to built mainly on gravel, cement stabilisation comply with current safety standards. To The life cycle cost analysis showed that the is also being used. The old concrete is being cope with future air traffic and the safety rigid pavement option was preferable. recycled for use in the construction work aspects, the decision was taken to realign for Terminal 5. and strengthen this taxiway. Since the pavement design was based on an analytical approach the materials were Following this is the redevelopment of As an island, Jersey has limited aggregate specified in terms of performance rather Pier 6 of Terminal 3, which is being resources, and high harbour dues make the than taking a prescribed approach demolished and realigned to suit the A380 importation of materials and specialised taxiway. There will also be four stands plant expensive. Therefore optimising the End product performance related testing capable of accommodating the new plane. pavement design and maximising the was adopted to monitor and approve the A particular challenge is managing the performance of locally available materials pavement materials during construction. interface between several projects were key to achieving best value for the This included dynamic plate bearing tests underway at the same time, including the project. for the subgrade and capping stiffnesses, and compressive strength for the PQC and construction of a new tunnel between the The client, Jersey Airport, had experience CBM. central terminal area and the new Terminal 5. of concrete taxiways utilising local This will allow the delivery of three remote aggregates and found that they provided The development work achieved T5 stands before the opening of the new low maintenance and long term durability, considerable improvements in the terminal building. but they also had to consider the pavement’s value for money and allowed BAA’s Managing Director, Mike Clasper, alternative of flexible pavements, taking the utilisation of more sustainable predicts moderate growth in air traffic of into account whole life cost where pavement materials with associated 3 – 5% per annum over the next 10 years, resurfacing would be required within the environmental benefits. The following cost with recent traffic affected by the SARS pavement design life. savings were achieved: outbreak. Despite the slowdown, he says The contractor, Britpave members, Scott • 10% reduction in PQC thickness due to that runway capacity in the south east has Wilson Pavement Engineering, carried out higher flexural strength already reached capacity during the peak material studies to ascertain the way • 30% cost saving in CBM by using hours, and calls for the Government’s forward, making best use of local secondary aggregates consultation on future runways to help materials. These were carried out in the meet long term objectives. laboratory followed by field trials: They • 90% reduction in capping cost by BAA is already committed to investment investigated: utilising site excavated Mudstone in lieu of granular materials. of over £8bn over the next 10 years. • Capping/subgrade improvement from Projects include the £3.9m on Terminal 5, Mudstone (in nearby borrow pits) For further details contact: Dr Bachar £1bn at Gatwick to raise capacity to Hakim of Scott Wilson Pavement 40 million passengers, £800m at Stansted, • Cement bound material (CBM) using Engineering at [email protected] £3.4bn at Heathrow and £500m at Scottish quarry screenings airports. 2 www.britpave.org.uk London City Airport extension finishes four months early London City Airport now has the benefit of increased capacity following the completion in September 2003 of the Runway 28 Hold project that provided valuable holding space for aircraft at the eastern end of the runway. The unique surroundings of this innovative airport provided challenges