In tendering for this scheme we built upon our experience gained on the M40 Junction 15 scheme completed five years earlier for Morrison Construction (now part of Galliford Try)
As the Tollbar Island is one of the most heavily congested junctions in the West Midlands region, it was imperative to ease the traffic flow. The scheme is designed to greatly improve economic efficiency by decreasing congestion and improving reliability of journey times for the travelling public. The scheme also provides a safer system for road users and pedestrians.
The improvement works consisted of the following:
• Enlarging the roundabout
• Introducing an underpass which connects the A45 Stonebridge Highway and A46 Coventry Eastern Bypass
• Adding an extra lane in each direction between Stivichall and Tollbar junctions
Early Contractor Involvement
There was a considerable period of Early Contractor Involvement (ECI) and this was used to develop the working methods and programme sequence for the scheme. We contributed technical and practical knowledge to the delivery team developing the delivery plan.
We proposed the use of Cement Bound Granular Mixture (CBGM) for areas where full pavement construction was required as this was the most cost effective solution for the client. In addition a pavement constructed with CBGM would be stronger and more durable than a standard asphalt pavement.
We identified the presence of tar bound material in the existing pavement construction. Using CBGM enabled the encapsulation of the tar bound material, from road planings, safely into the new pavement construction; rendering it harmless. This eliminated the cost of taking the material to landfill and removed the risks associated with storing the tar bound material.
Where areas of widening needed to match the specification of the current road, we proposed the use of EME2 asphalt. CBGM could not be used in these areas because of depth and drainage requirements. Although EME2 is a more expensive material it can be thinly laid due to its high bitumen content.
As the roundabout was in close proximity of Coventry Airport, we needed to be sure that the height of our plant would not interfere with flight path restrictions. All of our equipment was been checked for compliance and deemed to be acceptable by the airport.
Integration with Client Process’s
At ECI stage we agreed with the client that we would ensure that all of our employees fully adhered to Galliford Try’s innovative health and safety procedures at all times. This was in addition to our own health and safety policy and procedures. Some of these processes included:
• Vehicles – Only vehicles with the correct colour signage and beacons were permitted on site.
• Traffic Safety and Control Officer (TSCO) – Only the TSCO was authorised to assist the travelling public with broken-down vehicles within the works area. This was monitored through a CCTV system located in the site office. There was a dedicated person responsible for monitoring this system to identify any broken down vehicles. The TSCO was then contacted to assist any breakdowns. The TSCO contact details were provided as part of all site inductions in case contact was required. This ensured the safety of the workforce and mitigated the risk associated with the workforce entering the carriageway to assist a breakdown. All traffic management was handled by Galliford Try.
• Fingerprint Recognition – All staff and visitors (who attend the site more than once) have their fingerprint swiped. This enables them to enter and exit the site through the finger print recognition system which assists Galliford Try with monitoring personnel on/off site.
• Near Misses and Incidents – Located within the reception of the site is a touchscreen device that all staff will have a unique code for. This allows them to log onto the device anonymously to report any incidents or near misses.
Meetings and Briefings
Regular briefings were held between ourselves and Galliford Try to discuss previous works completed and the scope of works planned, including any health and safety issues that had been logged through the touchscreen device.
Collaborative planning meetings were held every Tuesday and progress meetings every Thursday. In these meetings the team reviewed how well the works were progressing and discussed the forward programme of works in the light of past progress. The meetings ensured that when large numbers of staff and operatives were on site (for various elements involved in the works) the working areas were properly identified and segregated and that workforce briefings included information on what was happening in adjacent areas of the site. Maintaining awareness of the risks across the site was essential on a scheme of this size, complexity and duration to avoid complacency on health and safety.
For the A45/A46 Tollbar scheme we used key members of our local supply chain, including:
Tripod Crest- For all of the planing works.
CET- For the testing of all CBGM and EME2 that is laid.