WSP, working collaboratively with Highways England, stakeholders and the local community designed a £75m scheme in 2014/15, to reduce congestion, increase capacity, improve
journey times whilst also improving road safety for both road users and the local community. The scheme would also deliver in-direct benefits such as supporting regeneration in Tyne and
Wear and Northumberland regions, and maintain or improve facilities for pedestrians and cyclists crossing and travelling along the route.
Specifically, it is planned to realign the A19 under the existing A19 Silverlink roundabout, constructing slip roads to allow the A19/A1058 Coast Road
junction to provide access to the junction to and from the lowered A19. In addition, there will be 3 new single span structures constructed to allow the
A1058 Coast Road and A19 Silverlink roundabout to cross over the realigned A19. Work will include the construction of retaining walls to minimise how much
new land the new layout will use, whilst also retaining and enhancing facilities for cyclists, horse riders and pedestrians
The Middle Engine Lane railway bridge will also be widened to allow it to accommodate the A19 north facing slip roads and new infrastructure/street furniture associated with the scheme
works identified above including central reserve concrete barriers, drainage, pavements, road lighting, traffic signals, traffic signs, road markings and CCTV also installed.
BAUER Technologies Limited was awarded the bored piling scope of works for critical structures and contiguous pile walls by Sisk Lagan JV, the Main Contractor grouping responsible for the
A19/A1058 Junction Improvement project for Highways England. Divided into two phases, Bauer’s remit was to install 587No rock-socketed contiguous rotary bored piles with diameters
ranging from 600mm to 1500mm and commenced works December 2016. The piles, which were up to 31m long, are founded in long rock sockets in the middle coal measures Sandstone
bedrock formation; with UCS values that averaged 31MPa. The installed piles then form the bearing and contiguous pile walls, creating the underpass for
the A19 dual carriageway ‘dive under’ once the mass dig is completed. The piles themselves where constructed to meet specification and design; bored piles were drilled in dry conditions and
concreted using a C40 Concrete mix designed and extensively trailed by Bauer and its supplier Breeden to ensure correct flow for the potential of ‘wet conditions’ tremie placement.
Cages where supplied by F Brazil utilising easyloc splicing; several cages incorporated inclinometer reservation tubes. Service cranes where specified to enable lifting of complete cages
once spliced. The piles where heavily and fully reinforced; cage weights ranged from a couple hundred kilos on the 600mm piles to over 13 tonnes on the large 1500mm diameter piles. The
pile cages where delivered on a ‘just in time’ basis dictated by the piling installation sequencing.
Bauer employed a permanent escort vehicle to ensure wagons followed predefined routes to ensure the safe delivery; many wagons totalling over 24m in length. Several retaining wall
piles also act as hybrid design elements by carrying the load of three major single span bridges across the underpass. To verify the design load capacity of these critical foundations,
Bauer carried out three permanent pile load tests using the innovative Osterberg testing method; this mitigated the need for anchor piles and testing frame hence helping to reduce the
overall programme. Piling was undertaken using a Bauer BG30 rig, followed by a Bauer BG20 rig in early 2017. The second phase of the works was performed using a BG30 rig and
a BG39 rig.
The project was not without its challenges, specifically, it required Bauer to work within a live, major roundabout with a heavy volume of traffic. In fact, traffic
studies estimated the volume to be in the region of some 80,000 vehicles passing through so in order to manage the associated risks efficiently, Bauer worked closely with SLJV and
Highways England in order to implement stringent health and safety processes. Bauer also participated enthusiastically in Highways England’s “Raising the Bar” scheme which is
designed to raise standards in Efficiency, Quality and Health and Safety.
The project was completed successfully in April 2017, with all works were completed to the agreed programme and in fact exceeded the expectations of WSP and SLJV, with some 45,000 hrs
total hours worked without incident.
||Sisk Lagan JV
||BAUER Technologies Limited
||Phase 1: Oct 16 – Mar 2017
Phase 2: July 17 – April 2018
||- BG 20; BG 30; BG 39
|Bauer's Scope of Works:
||- 106no 600mm Piles
- 163no 750mm Piles + 4no 750mm Gantry Piles
- 194no 1200mm Piles
- 120no 1500mm Piles