Case Study Overview
In February 2014, the sea wall in Dawlish, Devon, collapsed during severe storms, causing the ground beneath the mainline railway track, which runs alongside the beach, to subside. Red7Marine was subcontracted by Amco Rail to provide specialist marine expertise and a stable working platform for plant and equipment.
At a glance
- Location: Dawlish sea wall, 2015
- Plant used: 250T Haven Seariser 4, 100T Haven Seajack 3
- What we did: Red7Marine supported Amco Rail on its contract with Network Rail to repair the seawall in Dawlish which collapsed during fierce storms in 2014
- Contract value: £500,000
The Challenge
Initially, an 80-metre breach in the seawall was temporarily bolstered by using 19 freight containers welded together.
The seawall was then rebuilt and constructed with more than 6,000 tonnes of concrete and 150 tonnes of steel. This included building a new sea wall in front of the old wall to give added protection in the event of repeat extreme weather. A few miles down the coast at Teignmouth, 25,000 tonnes of collapsed cliff had to be removed. In a four-mile stretch of railway, 600 metres of parapets and 700 metres of track and ballast had to be replaced, along with cables and signalling equipment. The coastal footpath and Dawlish station was also rebuilt.
The Solution
The 250t Haven Seariser 4 was towed to site by Falmouth Tug MTS Indus, with final positioning on the beach by Taska Marine’s 1204 shallow draught, road transportable tug and the local Teignmouth Maritime Services’ tug, Boojum Bay.
The Haven Seariser 4 was used to support a 135t crawler crane hired from Weldex, which was used to install Pre-Cast Concrete L section wall units to increase the seawall height. Red7Marine’s smaller jack-up, the 100t Haven Seajack 3 was also brought in later to the project to support a second Weldex crane which assisted with drilling operations to secure the L section units.
SEE RELATED CASE STUDIES
Westminster Pier Extension
The Westminster Pier Extension allows more frequent River Bus services between Woolwich and North Greenwich to Westminster. The extension is a key part of the River Action Plan to improve TfL’s piers and increase capacity for passengers before 2020. Red7Marine designed and built a custom pile gate for the project. The barge was reviewed to support a 180t crawler crane for piling operations and was then further reviewed with an additional RH28 drill rig on board.
Brighton Marina
Phase 2
In order to accommodate a new luxury apartment block in Brighton, part of the marina needed to be reclaimed using sheet piled cofferdams. This would enable the water to be kept out and foundations to be built for the stunning seafront properties. Red7Marine supported the installation of a sheet pile twin wall cofferdam.
Oldbury
Red7Marine installed replacement Active Effluent Discharge Lines at Oldbury power station as part of the on-going care and maintenance works. Red7Marine’s previous project experience on similar projects consisting of works on subsea pipeline and outfalls at Bradwell and Sizewell nuclear power stations, positioned the company as the ideal marine partner for client, Magnox.
Emirates Cable Car
The Emirates cable car was installed to provide a pedestrian link across the River Thames between the Royal Docks and the Greenwich peninsula. Red7Marine worked with Bachy Soletanche in a joint venture to install the foundations for the one-kilometre long cable car using marine rotary bored piling.
Middleton Sands Navigation Marker
This fast turn-around marine construction project involved the installation of a new tubular steel navigation marker pile at Middleton Sands, Barrow-in-Furness in 2017. The navigation marker was required to identify the sub surface obstructions and enable other vessels in the area to operate safely.
Liverpool 2 Deep Water Port Extension
Red7Marine was the marine partner of choice for BAM Nuttall when they constructed a piled combi-wall as part of the Liverpool 2 Dock Expansion that began in 2014. The construction of the container terminal was supported by four of Red7Marine’s jack up barges; the Haven Seariser 1, Haven Seariser 2 and the Haven Seariser 3 and the Haven Seajack as it carried out rock socket piling works.
Weston-Super-Mare
The Red7Marine team was chosen to provide specialist marine plant and personnel to aid the redevelopment of the Weston-super-Mare Grand Pier after it was destroyed in a fire in 2008. Red7Marine supplied the Haven Seajack 4 assisted in the pier construction works. Its previous experience in pier and marina construction works made it the ideal project partner for this development.
Bradwell Power Station Barrier Wall Removal
Red7Marine is a leading provider of equipment for marine demolition and is skilled in dismantling structures that are beyond the reach of ordinary demolition contractors. In 2012, Red7Marine removed approximately 800 tonnes of steel in the Blackwater Estuary from the Bradwell nuclear power station water intake structure.
Fingringhoe Firing Ranges
Red7Marine installed scour protection and provided remediation on damaged sections of the flood defences to preserve areas of the salt marsh at the Fingringhoe firing ranges in Essex. Scour protection and remediation techniques are used to control erosion in both estuarine and the offshore environments.
