Scottish Motorway and Trunk Road Refurbishment and Reconstruction
Client: Transport Scotland
Amey Infrastructure Services / Bear Scotland Limited
Duration: Lane rental contracts, of individual periods of time
Transport Scotland benefit from over 50 years of Tarmac experience
Tarmac has been maintaining Transport Scotland's (and its predecessor, the Scottish Executive) road network for
over 50 years. We have successfully undertaken contracts on almost all motorways and trunk roads from the
Scottish Borders to the Highlands gaining an invaluable knowledge that is taken forward by a dedicated team
of site management onto the next site and the next contract.
Since the start of 2002 alone Tarmac has completed over 30 No. major contracts designed by Amey Infrastructure Services and Bear Scotland Ltd the two Operating Companies responsible for managing and maintaining the road network on behalf of Transport Scotland. The value of these contracts has ranged between £510k and £4.2 million with an average in excess of £2 million.
Tarmac's contracts have involved the management of a wide cross section of construction activities Transport Scotland’s contracts involve carriageway reconstruction and refurbishment works on busy high speed roads, from sections of single carriageway to the three lanes of the M8 in central Glasgow. All works have required complex systems of traffic management from road closures to 2 x 2 contraflows using newly built central reserve crossovers. In addition to traffic management, the Works typically involve excavation, removal and reconstruction of the existing carriageway; drainage improvement and repair works; bridge deck refurbishment; concrete repairs; safety fence replacement; kerbing works; re-profiling of verges; installation of electrical and communications ducting and cabling; new road signs and new road markings.
All works have been completed on time
All contracts have been lane rental type schemes involving limited carriageway possession times with the imposition of a financial penalty for any overrun. Tarmac has never incurred such penalties.
As main contractor we have continually programmed works that involve an element of (and sometimes a majority of) night works and weekend working involving 24 hour working, 7 days a week. We have gained a wide understanding of the logistical benefits and problems that lane rental types of contract can create and have developed robust operational systems to meet their unique challenge.
Consistent and Experienced supply chain partners have provided valuable support
By value, Tarmac typically undertakes an average of 60% of each contract's workload using in-house resources. This has included the supply and laying of asphalt and the erection of safety fencing using our Highway Services Division.
Our subcontractors have their own close-knit local relationships coupled with local expertise within their own geographical area. Our regional contracting office at Bellshill maintains a list of experienced and proficient specialist subcontractors who become involved at an early stage of the programming and estimating process to ensure we fully understand the contract requirements and can submit the most advantageous submission.
We have consistently used the same group of supply chain partners, employing similarly knowledgeable and experienced site staff that work with us as part of an integrated team before, during and after completion. The following two schemes illustrate the type of work we complete for Transport Scotland:
A9 Auchterarder to Whitemoss, Perth and Kinross
Aug - Oct 2007 £2.6 million Bear Scotland Ltd
Works were required to be carried out in two phases to accommodate the Johnnie Walker Golf Championship at Gleneagles (30th August - 2nd September).
Phase 1 (10th - 24th August)
Simultaneous right lane closures to allow removal of the existing wire rope safety barrier from the central reserve and the erection of replacement flex beam system.
Phase 2 (5th September - 2nd October)
A contraflow system of traffic management was installed with all traffic running on the southbound carriageway. 2.8km of the northbound carriageway was then excavated to a depth of 560 mm by cold milling. Reconstruction involved 200 mm of Type 1 sub-base, 260 mm of DBM base, 60 mm of DBM Binder and 40 mm deep Masterflex surface course. All 5.6 km of existing kerbs were excavated and replaced, including 600m of combined kerb/drainage units. A total of 64 No. new gullies were installed along with 50 No. replacement drainage covers. Cross carriageway ducting was installed at 5 No. locations.
M8 Helen St to M77 Eastbound Repairs, Glasgow
Jul -Aug 2006 £4.15 million Amey Infrastructure Services
1.8km stretch of predominantly three lane motorway with hardshoulder between J20 and J24.
7 days a week working using contraflow traffic management.
Removal of existing carriageway down to formation level by cold milling. Removal of shale formation also by milling machine. All planing undertaken using night shifts.
Renewal of the existing surfacing comprised 150 mm sub-base, 270 mm HDM 50 Base, 50 mm HDM 50 Binder and 30 mm Masterflex surface course.
Associated civils including new crossovers, kerbing, drainage (new off line gullies), communication ducts, road signs and permanent CCTV cameras.
Concrete repairs to overbridges (deck soffits, piers and parapets).
New reinforced concrete pier protection cast around existing pier column supports at one overbridge.
Barrier works involved the renewal of 4.5 km of existing road restraint systems. Double sided box beam was erected in the central reserve, with single sided box beam along both hard shoulders.
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Scottish Motorway and Trunk Road (pdf, 293kb)
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