06 June 2019
Sponsored by Artelia Group
*** WINNER *** M25 EMI Waterproofing - submitted by Jackson Civil Engineering
Over the past year, the M25 EMI (Enhanced Maintenance Intervention) Waterproofing team has been responsible for managing surfacing and waterproofing defects across the entire M25 network in a more proactive way, planning defect repairs in clusters, and adopting new working methods to ensure the best value for the client.
Connect Plus, Jackson, Tarmac, Aggregate industries and TechJoint have been working together for a number of years on various projects around the M25 Network. The concept of their enhanced maintenance intervention team is to involve representatives across the supply chain to plan repairs in advance to achieve the best value.
Connect Plus holds the 30-year DBFO (Design Build Finance Operate) contract to manage the M25 network for Highways England. The motorway, which is the busiest in the UK, requires constant maintenance to ensure traffic can flow around the capital. By its very nature, the 30-year DBFO contract encourages Connect Plus and its supply chain to design maintenance and repair solutions with whole life cost and value in mind, and Connect Plus is incentivised through the penalty charge system, PayMec, to keep interventions on the network to a minimum.
Previously, the challenge with this type of maintenance has been that defects were addressed in a reactive way. For example, after a period of heavy rainfall, a pothole formed in the road surface causing a lane to be closed, triggering an emergency repair in order to re-open the lane. Under these circumstances, the immediate defect would be dealt with but, due to the emergency nature, the rest of the structure wouldn’t be fully assessed which would result in repeat visits to the same area of the network.
Whilst emergency repairs will always be required, the M25 EMI Waterproofing team have implemented a new strategy for identifying and repairing defects more efficiently. Using existing technology in new ways, the team use Ground Penetrating Radar surveys to identify moisture content in the surfacing and waterproofing layers of the structure deck. These surveys produce detailed visuals of the surface conditions on the structure and highlight weak points that aren’t always identified by the naked eye.
This allows the team to deliver more for less, tackling repairs in clusters, resulting in fewer interventions on the network and reducing disruption to motorists and workforce exposure to live traffic. In 2018, they completed eight separate EMI waterproofing schemes totalling £1.5m in value, treating 1500sq metres of defective or degrading waterproofing and surfacing. The new Enhanced Maintenance Interventions team can now plan effective permanent repairs with whole life cost and value in mind.
Using existing technology in a new way to identify defects in advance has reduced interventions on the network, helping to meet Highways England’s three main imperatives: Health & Safety, Customer Service and Delivery.
Over the course of 2018, the team delivered eight separate repair schemes, saving 26 night-shifts, 7800 man hours and £1,040,000 cash.
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The SECBE 2019 Value Award is sponsored by Artelia Group.