Location: Anlaby and Kirk Ella (western suburbs of Hull)
Period: August 2017 – August 2018
The works (located in the parishes of Anlaby and Kirk Ella which form part of the western suburbs of Hull) constituted the first phase of the Anlaby & East Ella Flood Alleviation Scheme (AEEFAS) and comprised the following:
Replacement of existing structures carrying the Western Drain under the public highway with box culverts at the following locations:
Site A – South Ella Drive
Site B – Woodland Drive
Site C – Tranby Lane
The construction of a new culvert to carry a proposed flood alleviation channel under Beverley Road, Anlaby, approximately 50 metres south of the junction with Lowfield Road, referred to as ‘Site D – New Marr Bridge’
The AEEFAS scheme was designed to provide flood protection to approximately 3,500 properties in the area during extreme rainfall events. The existing culverts on the Western Drain watercourse didn’t provide sufficient capacity during such events, thus restricting flow. The replacement of the culverts was designed to address this issue. Further phases of the scheme involved construction of measures to divert flow out of Western Drain. The culvert at New Marr Bridge carries this diverted flow under Beverley Road.
Sites A, B & C were delivered in a similar manner; the roads were closed at the junctions, the old culverts were dug out and the new, larger culverts were dropped in using a crane. The new culverts were pre-cast concrete and manufactured specifically for each location and the excavations were supported by sheet piles, carefully placed around the services present. They were delivered one site at a time due to being nearby to each other, taking the road closures into account. The order of work was site A, C, B and then D
Due to the depth of the work there was always a huge amount of services present which meant a lot of careful digging around those services and protecting them while they were exposed. When the existing road was excavated for the new culverts, sheet piles had to be installed to support the excavation. These were placed around the services passing through the excavation
As well as a new culvert, new headwalls were installed at each end to support the new, larger culvert
Replacement/reinstatement of the kerbs at the junction, along with the carriageway tarmac reinstatement and road markings
Due to the nature of the works it was very wet which resulted in a lot of water pumping to ensure the works area was cleared
Site D (New Marr Bridge) was different from the other three as it was a lot bigger. It was a huge excavation for this area and there were a lot of service diversions works to accommodate the new structure. Parts of this phase were completed while maintaining an open carriageway on Lowfield Road
Client: North East Lincolnshire Council
Location: Humberston Fitties Chalet Park
Period: February 2015 to April 2015
The project consisted of the refurbishment of a 70 metre long section of the 1963 coastal defence using a similar construction methodology as that of the existing defences constructed between 2000, 2003 and 2011. Following demolition of the existing gabion defence, new “A” frames were erected at 1.80 metre centres comprising rectangular reinforced concrete members tied together with hardwood sections.
Double layered galvanised steel mesh was fixed between the concrete members and rock armour placed behind the mesh.
The demolition arising’s were used as fill material behind and below the new works and the leading edge of the sand dunes were re-profiled and a granite rock armour capping was installed along the length of the wall.
The works were carried out between high tides which were also affected by high winds and atmospheric pressures to increase the predicted heights.
The Fitties beach is a popular amenity beach, green space and within the Humber Estuary Site of Special Scientific Interest (SSSI).
Client: East Riding of Yorkshire Council
Location: Withernsea Seafront
Period: September 2014 to January 2015
The construction of a new slipway to allow boats to access the beach from the promenade level, works included rock armour, steel sheet piling, concrete works and flood gate. All works were completed in an exposed location subject to tidal water.
The works consisted of the following:
Work on the beach in an exposed location subject to tidal effects
Excavate and store for re-use heavy rock armour
Installation of permanent sheet piles with ties
Reinstate rock armour and fill behind the piles
Form concrete slipway
Breaking through existing concrete sea wall
Installation of temporary flood defence measures
New paved access across the promenade and supply and installation of new sea defence steel flood gate
The working area had the following constraints which were successfully managed during the contract:
Difficulty in keeping out the public
Changing beach levels
Extreme weather and sea conditions
Restriction on working hours
Not exceeding maximum noise levels