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www.jacobs.com | worldwide
N17/N18 Gort - Tuam PPP Scheme Construction update and engineering challenges
TII Annual Conference 28-29 September 2016 Presented by Obey Mhondera & Stuart Nicol
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N17 Tuam Bypass CPO 2005 (4km)
M17 Galway Tuam CPO 2007 (26km)
N18 Oranmore Gort CPO 2006 (27km)
Total Length 57km
M17/M18 Gort to Tuam – Scheme Combined
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Start of Tender - June 2009
Financial Close & DirectRoute Tuam Ltd appointed - April 2014
Mobilisation, Advance Work & Detailed Design - April-Dec 2014
Construction Start - January 2015
Open to traffic - Q3 2017
Construction Completion - Q1 2018
Procurement & Construction Programme
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25 year concession period (2018-2043)
Private sector designs, builds, finances and operates (incl.
maintenance) the Project Road
Private sector funds construction
PPP Co. receives availability payments over 25 years
Road returns to public sector with prescribed residual life
PPP Model
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• DirectRoute entered into a voluntary refinancing of
the scheme which was concluded in early 2016.
• This refinancing is unique in Ireland. Refinancing normally occurs after construction when the Project is greatly de-risked from a lender’s perspective.
• The Project originally closed in April 2014 at a time of relatively high debt pricing, reflective of the markets at the time in addition to the ‘Ireland Inc’ concerns around its financial crisis.
PPP Co. Refinancing
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PPP Co. Refinancing
• TII benefitted from the refinancing gain in accordance with the terms of the sharing mechanics agreed in the original PPP Agreement.
• The refinancing demonstrates that investors have an appetite for well structured project finance opportunities in Ireland.
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DTTAS Road Reclassification
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DTTAS Road Reclassification
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• 2,450,000 hours worked on site.
• 3,717 Site inductions.
• 776 personnel working on behalf of the PPP Co.
• 416 items of major plant on site.
• Reportable Accident Frequency Ratio is 0.16.
• Lost Time Injury [all lost time] Frequency Rate is 0.49.
• 2 reportable dangerous occurrences & 4 reportable injuries.
Project Resourcing & Health and Safety
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Structures
• 53 Bridges - 75% complete
• 51 Other Structures - 45% complete
Peat Removal (250,000 m3) - 100% complete
Rock Exc. & rocessing (2,000,000 m3) - 98% complete
Cut Volume (4,500,000 m3) - 99% complete
Fill Volume (3,000,000 m3) - 95% complete
Pavement (550,000 Tonnes) - 40% complete
Key Scope Elements & Progress
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Rock Cut M17 Ch.18+300 Northern Section
Progress
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Rock Processing M18Ch.11+500 Southern Section
Progress
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Deck Pour OB161 M18 Ch.16+100 Southern Section
Progress
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Annagh Hill Junction OB125 M17Ch.12+500 Central Section
Progress
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Placing CBM M17Ch.3+900 Central Section
Progress
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Placing Binder Layer M18Ch.12+400 Southern Section
Progress
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Safety Barrier Installation M17Ch.14+750 Northern Section
Progress
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Median Barrier Installation M17Ch.15+800 Northern Section
Progress
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Structure OB114 M18Ch.11+400 Southern Section
Progress
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Tuam Bypass Northern Section
Progress
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Gort Tie-In M17Ch.26+600-Ch.25+200 Southern Section
Progress
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M6-M17-M18 Junction at Rathmorrissy
Engineering Challenges – Project Scale
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Vertical Drainage
Surcharged Embankment
Settlement Graph
Engineering Challenges – Soft Ground
Surcharge
Settlement
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M17Ch12+500 Central Section 10th August 2015
M18Ch23+000 Southern Section 4th May 2016
M17Ch18+100 Northern Section 11th February 2016
Engineering Challenges – Karst
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M18Ch8+900 Southern Section Original Position OB89
New Position OB89
Cavity 0.3m x 5m deep
Multiple Cavities
4 large clay infilled karst features
Cavity 2m wide by 5m deep
OB89 Roevehagh
Engineering Challenges – Karst
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Kerb Slot Drain Installation: M17Ch.4+250
Central Section
Engineering Challenges – Project Scale
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Attenuation Pond M17Ch.14+600 Northern Section
Engineering Challenges – Drainage
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M18Ch.22+500 to Ch23+000 Southern Section 10th February 2016
Engineering Challenges – Flooding
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M17Ch.20+200 to Ch21+700 Southern Section 27th December 2015
Engineering Challenges – Project Scale
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• November 2009 Event – 25 days of rain – 450mm of accumulated depth of rain – In excess of a 1 in 1000 year event
• December 2015/January 2016 Event – 40 days of rain – 500mm of accumulated depth of rain – In excess of a 1 in 1000 year event
Engineering Challenges – Flooding
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Slieve Aughty
Catchment Area South Galway
Engineering Challenges – Flooding
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11th December 2015 24th August 2016
Dunkellin River Bridge UB100 : Southern Section
Engineering Challenges – Flooding
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11th December 2015 24th August 2016
Abbert River Bridge UB146 Engineering Challenges – Flooding
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11th December 2015 5th August 2016
Grange River Bridge UB194 Engineering Challenges – Flooding
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11th December 2015 24th August 2016
Ballymaquiff M18Ch.20+700 to 21+000 Engineering Challenges – Flooding
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The Construction Requirements include;
• 9km of free draining embankments 0.5m above flood levels.
• Minimum vertical alignment requirements.
• Flood Alleviation Culverts.
• Ponds bunded to protect from flood waters.
• Bridge set-backs for flood clearance.
Engineering Challenges – Flooding
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Tremendous progress being achieved on the N17N18 PPP Scheme
Do extraordinary flooding events point to climate change?
What is TII’s Response to Climate Change?
TII Strategy for Adapting Climate Change on Ireland’s Light Rail and
National Road Network(Jan 2016)
Incorporating climate change effects in Standards
Flood Mapping Tool
CEDR Research Programme (s)
Concluding Remarks