Coastal & Marine Infrastructure Archives - Award Winning Civil Engineering Company

Clacton to Holland on Sea, Essex – Coastal protection scheme

Anthony Bullick — Tue, 22 Nov 2016 16:49:28 +0000

Jones Bros operated as a sub-contractor to principle contractor VBA Joint Venture, to construct Phase 1: 8 rock groynes and Phase 2: 15 rock groynes, for the Clacton to Holland-on-Sea coastal protection scheme.

The £36m coastal protection scheme required approximately 270,000 tonnes of rock to construct the groynes, which will protect more than 3,000 properties from sea erosion. In order to meet the demands of the challenging scheme, Jones Bros utilised the latest GPS technology and had to work around local tidal tables.

Plant used to move rock for the new groynes into place was upgraded to include Trimble GCS900 Grade Control Systems. The GPS system, which allows accurate control of buckets and blades to within 20mm, allowed Jones Bros plant operatives to accurately install the rock groynes in water up to 150cm in depth.

For further info on this, please click here Clacton to Holland on Sea, Essex – Coastal protection scheme.

Llanddulas jetty demolition

Anthony Bullick — Tue, 22 Nov 2016 16:19:45 +0000

The demolition and removal of existing and dangerous jetty structure, elevated conveyor system and associated buildings. The jetty was connected to the conveyor station building, which was a large concrete structure, with the conveyor system continuing inland, passing beneath the busy A55, Network rail line, Sustrans route and A547, to the now redundant quarry.

Work included:

Demolition and removal of jetty’s timber and steel piles, which were firmly embedded 2m below the sea bed – all undertaken during the workable timeframe of the low tides.
Demolition and removal of conveyor system and connecting conveyor station building – carried out by high-reach excavators fitted with specialist hydraulic munchers and shears.
Crushing of broken concrete to produce 6F2 for use as infill
All other demolition material suitable for recycling was transported off site for re-use
Translocation (in part) of crustaceans (Sabellaria) from timber/steel piles for re-growth
Manned crossing points and beach marshalls deployed to ensure safety access to beach front for members of the public

For further info on this, please click here Llanddulas jetty demolition.

Pwllheli Sailing Academy & Events Centre

Anthony Bullick — Tue, 22 Nov 2016 15:09:21 +0000

Dredging works and infrastructure for new Pwllheli Sailing Academy building.

Works included:

Dredging 83,000m³ of material and removal off-site for recycling – to maintain sailing channel and accommodate additional berths
Construction of new access to marina extension
Construction of 140m containment bund
Construction of 80 linear/m of sheet pile walling and capping beam for new quay wall
Installation of new flexible pontoon berths and pedestrian linkspan
All works carried out in an environmentally sensitive area, using in-house plant and labour.

The proposed 83,000m³ of dredgings was to be removed off site, however, as part of our ‘value engineering’, we proposed an alternative solution of retaining all the dredged arisings on site, to be utilised as either beach recharge material or as a reclamation area, which could then be used to enhance the local wildlife. This method gave a saving to the Client of approximately £1.5m.

Planning approval and marine consent was provided in December 2013 and works commenced in January 2014. The project was completed in July 2014.

For further info on this, please click here Pwllheli Sailing Academy & Events Centre.

Pwllheli Sailing Academy & Events Centre

Anthony Bullick — Tue, 22 Nov 2016 15:09:21 +0000

Dredging 83,000m³ of material and removal off-site for recycling – to maintain sailing channel and accommodate additional berths

Construction of new access to marina extension

Construction of 140m containment bund

Construction of 80 linear/m of sheet pile walling and capping beam for new quay wall

Installation of new flexible pontoon berths and pedestrian linkspan

All works carried out in an environmentally sensitive area, using in-house plant and labour.

The project vision was to create a sailing academy and events centre that maximises the potential afforded by the natural location and world class sailing waters around Pwllheli. The works incorporated maintenance and capital dredging, construction of a quay wall, mooring pontoons and a pedestrian linkspan. The proposed 83,000m³ of dredgings was to be removed off site, however, as part of our ‘value engineering’, we proposed an alternative solution of retaining all the dredged arisings on site, to be utilised as either beach recharge material or as a reclamation area, which could then be used to enhance the local wildlife. This method gave a saving to the Client of approximately £1.5m. Planning approval and marine consent was provided in December 2013 and works commenced in January 2014. The project was completed in July 2014.]]>

For further info on this, please click here Pwllheli Sailing Academy & Events Centre.

Tywyn Coastal Defence Scheme

Anthony Bullick — Wed, 17 Jul 2013 09:42:24 +0000

Work to restore Tywyn’s depleted sea defences involved approx 60,000 tonnes of armour stone being delivered by sea and road, following the removal of existing timber groynes.

The scheme comprised:

Removal of existing timber groynes
Construction of a rock armour breakwater, and placement of 15,000 tonnes of beach nourishment
Installation of rock groynes and a rock revetment
Replacement of the groyne field, salvaging existing planks where practical and reusing/recycling the steel and timber
Reconstruction/repair of slipways and access steps, including concrete steps along length of promenade and construction of viewing platform

The scheme was funded by the Welsh Government and European Regional Development Fund, as part of the Convergence programme.

For further info on this, please click here Tywyn Coastal Defence Scheme.

Terminal 3 Development

Anthony Bullick — Wed, 17 Jul 2013 09:41:57 +0000

The scheme involved the construction of an offshore rock breakwater containing more than 150,000 tonnes of locally produced rock core and armour, plus the infilling of 240,000m³ of dredged sand. Dredged sand was collected from a licensed area in Morecambe Bay and discharged hydraulically behind the breakwater via a 750mm diameter delivery pipe, which extended 1km out to sea to a mooring buoy, at which the dredger berthed. The total area of reclamation was approximately 40,000m² of which a third received permanent full construction of a stone capping layer, stone sub-base, dense bitumen macadam road base with 80mm key-block paving in order to take the heavy duty port traffic.

For further info on this, please click here Terminal 3 Development.

Deganwy Marina Construction

Anthony Bullick — Wed, 17 Jul 2013 09:41:32 +0000

A boating marina was built adjacent to an existing quay, as part of a prestige housing and hotel complex.

The work involved:

Construction of a rock breakwater projecting 170m into the environmentally sensitive River Conwy estuary
Formation of 70m x 250m sheet steel pile containment structure
Excavation to formation level within the steel-piling box, with unsuitable estuarine silt being removed from site to tip
Use of sand and gravel to raise the level of the surrounding development land

A pre-cast concrete harbour wall surmounting the piling was completed with an insitu concrete capping beam.

In addition, a dock gate was constructed along with new access roads, a level crossing and associated drainage and infrastructure works.

For further info on this, please click here Deganwy Marina Construction.