TII M17 M18 Gort to Tuam PPP Scheme - DirectRoute Presentation | 12th September 2018 - Engineers Ireland
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TII M17 M18 Gort to Tuam PPP Scheme DirectRoute Presentation | 12th September 2018
Outline of Presentation
Overview of the Project & PPP Structure
Declan Carney, DR General Manager, Construction
Stage
Design and Construction Challenges
Eamon Daly, Design Project Manager, Barry
Transportation
Emer O’Dea, Design Project Manager, Arup
Operations and Maintenance Phase / Life-Cycle
Niall Lyons, DR General Manager Operations
Stage
Q and A
M17 M18 Gort to Tuam PPP Scheme
Overview of the Project &
PPP Structure
Declan Carney, DR General Manager, Construction Stage
M17 M18 Gort to Tuam PPP Scheme
Overview of the Project
4.2 km N17 M17 26 km
N18 27km Oranmore –
Tuam Bypass Galway –
Gort CPO 2006
CPO 2005 Tuam CPO 2007
M17 M18 Gort to Tuam PPP Scheme
Overview of the Project
IRELAND GDP FROM CONSTRUCTION - €m
SOURCE: TRADINGECONOMICS.COM I CENTRAL STATISTICS OFFICE IRELAND
2005 – 2007 2008 June 2009-2014 - PPP Procurement 2014 -2016
(4 consortia)
N18 Mobilisation,
• Stage 1 – Nov 2009 advance work &
3 Planning D&B
design 2017 -
Approvals • BAFOs – Aug 2010 and Aug
1999 – 2006 2042
2011
2015 – 2017
• Route Selection O&M
• Suspended 2012 – 2013
• Environmental Assessment Construction
• Contract Close – 30/04/14
• Preparation Planning Approvals
PLANNING PROCUREMENT D&B O&M
M17 M18 Gort to Tuam PPP Scheme
Overview of the Project
Timetable Target Actual
Permit To Use 30/11/2017 30/11/2017
Completion 28/02/2018 19/12/2017
Road opened early & in full to traffic on 27th September
2017
M17 M18 Gort to Tuam PPP Scheme
Employer: Transport Sponsors Shareholding
Infrastructure Ireland (TII) Lagan Project Investments Ltd (10%)
PPP Road Holdings Ltd (10%) (Sisk)
Strabag SE (10%)
Consultant Agreements
NRA PPP Contract Motorway West Ltd (10%) (Roadbridge)
Funders (EIB, Natixis, Societe Road Infrastructure (Irl) Ltd (10%) (InfraRed)
Generale and Bank of Ireland) Marguerite Road Ireland Sarl (50%)
Funding Agreements
PPP Co
DirectRoute (Tuam) Ltd
Shareholders agreement
Design & Build
Construction Contract
100%
Direct Agreement Shareholding
DirectRoute (Tuam) Holdings Ltd
Construction Joint Venture
DirectRoute (Tuam) Construction Ltd O&M Contract
Lagan Construction Group Ltd Advisers to DirectRoute
Roadbridge 25% Financial: Societe Generale
John Sisk & Son (Holdings) Ltd Each Legal: A&L Goodbody
Strabag AG Insurance: AON & Glennon
Tax & Accounting: BDO
PCGs (Jt and Sev)
D&C Works Agreement Lagan Constr Group Hldgs Ltd
Sicon Ltd
Strabag SE
Roadbridge
Delivery Partner Delivery Partner Delivery Partner
South (Lagan) Centre (Sisk) North (Roadbridge)
Design Agreements O&M Sub-Contract
Interface Agreement
A-Way Lagan Infrastructure
Services Ltd (ALIS)
Design Team Design Team Design Team
South Centre North Collateral Agreement
And step-in PCGs (Jt and Sev)
Design JV (DJV) Lagan Constr Group Hldgs Ltd
Strabag SE
Arup & Barry Transportation
M17 M18 Gort to Tuam PPP Scheme
Direct Agreement
Delivery Structure Authority:
Transport Infrastructure Ireland
PPP Contract
PPP Co
DirectRoute (Tuam) Ltd
Design & Build Construction
Contract
Construction Joint Venture
DirectRoute (Tuam) Construction Ltd
D&C Works Agreements
Delivery Partner Delivery Partner Delivery Partner
South: Lagan Centre: Sisk North: Roadbridge
Design Agreements
Design JV (DJV)
Arup / JB Barry Transportation
M17 M18 Gort to Tuam PPP Scheme
Design & Construction Sections
JB Barry Transportation Arup
M17 M18 Gort to Tuam PPP Scheme
Refinancing • Funding markets at Financial Close April 2014 were generally closed to Ireland • Improvement in funding market terms and liquidity in the two year period from financial close • Recognised clear refinancing opportunity - highly unusual in the construction stage • Refinancing Financial Close in May 2016 • Significant savings delivered to the Authority in line with the Project Agreement • Change in identity of lenders • Comparatively low transaction costs M17 M18 Gort to Tuam PPP Scheme
Health & Safety M17 M18 Gort to Tuam PPP Scheme
Safety Initiatives
• Project Safety Forum
• Bespoke training “black hat” for all supervisors
• Common SOR system with trend analysis and
information sharing.
• Safety Incentive Scheme
• H&S Newsletters
• Stand downs/ Safety Days / Impact Speakers
• Full Class 3 high vis PPE
• 10 minute “Safety Chats”
• Worker surveys
M17 M18 Gort to Tuam PPP SchemeDesign and Construction
Challenges
Eamon Daly, Design Project Manager, Barry Transportation
Emer O’Dea, Design Project Manager, Arup
M17 M18 Gort to Tuam PPP SchemeOutline of Design and Construction Challenges • The Design Team • Design Challenges • Flooding and Drainage • Geotechnical Design • Pavement • Environmental Design and Mitigation • Key Structures and Junctions M17 M18 Gort to Tuam PPP Scheme
Design Joint Venture • Design Joint Venture consists of joint venture between Barry Transportation and Arup • Tender Design was completed in 2010 and formed the Conceptual Design • Barry Transportation were designers for the northern half of the scheme, Arup designers for the southern half of the scheme • Detail Design commenced in May 2014 with the preparation of a Design Manual to standardise design approach across the Scheme • Max Design Team at Peak: Design Office: 93 Site: 25 M17 M18 Gort to Tuam PPP Scheme
Scheme Information – Key Elements • 53km of Standard Dual Carriageway Motorway • 4km of Type 2 Dual Carriageway • 4 grade Separated junctions including a major junction with the M6 Motorway • Link Roads, Side Road Diversions and Access Roads • 71 Principal Structures including road bridges, river bridges, rail bridges, footbridges, accommodation bridges and culverts, • 33 other structures including retaining walls, gantry signs and VMS signs • Fencing, Safety Barriers, drainage, communications, earthworks, signage, lining, landscaping, lighting, utilities, environmental and ancillary road works M17 M18 Gort to Tuam PPP Scheme
Key Design Challenges • Three Contractors – Two Designers – Design Consistency • Three Separate Design Supervision Teams with a head DSR overseeing all three • The design of significant Peat areas within the Tuam Bypass and on the M17 south of Tuam • Design of earthworks through areas of significant karst risk across all sections • Drainage in areas of regionally sensitive aquifers • Extensive seasonal flooding • Environmental • Structures • Pavement M17 M18 Gort to Tuam PPP Scheme
Flooding
November
2015
M17 M18 Gort to Tuam PPP SchemeFlooding
November
2015
M17 M18 Gort to Tuam PPP SchemeMitigation against Flooding • Drainage Blanket • Road Design Levels • Flood Relief Culverts M17 M18 Gort to Tuam PPP Scheme
Road Drainage Objectives • The speedy removal of surface water from running carriageway areas • The minimisation of the risks of pollution and flooding of receiving water bodies including measures to minimise the risk of accidental spillages causing pollution and to provide significant removal of suspended solids and other contaminants • The removal of sub-surface water to protect pavements and associated earthworks. M17 M18 Gort to Tuam PPP Scheme
Road Drainage - Pavement Drainage at transition areas • Speedy removal of surface water – related to pavement gradient • Potential flat spots at transition areas on sections of road with shallow gradients • Solution - Rolling Crowns – Application of superelevation along a diagonal crown line across the carriageway • Maintains minimum 2.5% carriageway gradient • Sufficiently long to achieve satisfactory ride quality • Particular care required with construction M17 M18 Gort to Tuam PPP Scheme
Road Drainage Types of Road Drainage Systems – Sealed Drainage Areas • Kerb Slot Drain / Carrier Pipe • Kerb and Gully system with Carrier Pipe • Combined Kerb Drainage Units – Envirokerb • Median Drainage – Slot Drains / gullies • Filter Drains also provided only to drain non contaminated run off and control groundwater levels M17 M18 Gort to Tuam PPP Scheme
Road Drainage Median Slot Drain M17 M18 Gort to Tuam PPP Scheme
Road Drainage Types of Drainage Systems – Non - Sealed Drainage Areas • Over the edge drainage • Filter Drains Sub Surface Drainage • On embankments – extension of capping • In Cuttings and Low embankments – Narrow Filter Drains M17 M18 Gort to Tuam PPP Scheme
Road Drainage Pollution Control • Silt trap gullies • Catchpits used throughout the scheme where possible • By pass petrol / Oil interceptors • Attenuation Ponds • Infiltration ponds • Pollution Control Forebays in all attenuation / Infiltration ponds M17 M18 Gort to Tuam PPP Scheme
Road Drainage - Attenuation Attenuation pond Infiltration Pond M17 M18 Gort to Tuam PPP Scheme
Road Drainage - Attenuation Constructed Wetland and Soakaway • Infiltration System • Excavation in Rock • Proximity to SAC and Local Group Water Scheme • Area of Seasonal Flooding M17 M18 Gort to Tuam PPP Scheme
M17 Soft Ground
Treatment
• Approx. 3km of soft ground
• Vertical band drains at 1.0m
spacing
• Up to 7m of embankment
• 1.5 years duration
• Constant monitoring of
instrumentation. PWP,
inclinometers, settlement
plates, etc.
M17 M18 Gort to Tuam PPP SchemeM17 Soft
Ground
Treatment
M17 M18 Gort to Tuam PPP SchemeM17 Soft Ground
Treatment
• 600mm lifts
• 3-4 month hold
periods
• PWP monitoring
• 1500mm of
settlement predicted
• 1500mm of
settlement achieved
M17 M18 Gort to Tuam PPP SchemeM17 Rock excavation • Approximately 1.8M m3 of rock excavation • 2m rock bench at top • Majority blasted and then excavated by machine to achieve the slope angle • Excavated to a 1:0.5 slope • https://www.youtube.c om/watch?v=7GNnT- oO8_k M17 M18 Gort to Tuam PPP Scheme
Karst risk assessment and standard detail development Desktop Study Site Walkover GSI Geology map and karst landforms via ArcGIS New features identified M17 M18 Gort to Tuam PPP Scheme
Karst risk assessment and standard detail development
• 1km Sections
Assessed
• Risk Assessment
Length (m) % of alignment Risk based on
9+530 43 High overburden cover,
rock type, density
11+510 52 Medium
of karst and
1+160 5 Low proximity to the
scheme
M17 M18 Gort to Tuam PPP SchemeKarst risk assessment and standard detail development M17 M18 Gort to Tuam PPP Scheme
Karst risk assessment and standard detail development
• Geotextile
Requirement
reduced toOB89 – Karst Uncovered M17 M18 Gort to Tuam PPP Scheme
Karst shown in geophysics at west and central pier during construction M17 M18 Gort to Tuam PPP Scheme
Option 1 – Leave OB89 in place and remediate karst
Central pier
Phase 1 rotary percussive and
geophysics 3 to 4m above formation
COMPLETE
Phase 2 Ground investigation –
geophysics at actual formation and
rotary percussive probes on grid to
estimate extent of feature
Phase 3 Create safe working platform
and carry out shell and auger boreholes
to determine soil parameters and rotary
coring 3m into rock for rock parameters
Clear out feature
and determine
extent
Backfill feature
beneath pavement to
SED
Scenario A Scenario B
If void beneath structure
foundation is small, backfill with If feature is large and in filled
inverted filter and design slab to with overburden and rock is at Scenario C
span feature depth, design skin friction piles
If feature is large and
rock is present, design
rock socketed piles
M17 M18 Gort to Tuam PPP SchemeScenarios B and C – Piled Solutions
???? ????
Either piles bearing in soil and Base of central pier at
on rock or 3m into rock – 18.6 m OD malin
dependent on depth of Type, depth, permanent casing
competent rock from boreholes and number TBC post design
M17 M18 Gort to Tuam PPP SchemeProposed alternative
locations and additional
ground investigation
OB89:
How did we
fix this on
Site? New location chosen
approximately 20m north of
the original
M17 M18 Gort to Tuam PPP SchemeM17 Ballinphuil Overbridge
• Large Void 12m x
8m
• Clay filled =
inactive
• 8 conduit karst
features above
the void – 600mm
wide
• Smooth edges,
flowing water =
active
M17 M18 Gort to Tuam PPP Scheme
Map all available informationBallinphuil: How did we
fix this on Site?
• Design already issued for
construction - 5mm
settlement limit at central pier
• Inactive void – infilled with
Class 6N2 and blinded with
concrete
• Active conduits – backfilled
with 0.5m no fines concrete
• Backfill with concrete to
underside of pier
M17 M18 Gort to Tuam PPP SchemeTuam Bypass
Ballygaddy Overbridge
Explorations Carried Out
• 4 Rotary Cores
• 1 CP Hole
• 5 trial pits
• 6 Geophysical resistivity
profiles
• Ground conductivity survey
• Karst Features Protocol
Followed
M17 M18 Gort to Tuam PPP SchemeTuam Bypass - Ballygaddy Overbridge
• Large Active Linear
Karst Feature
• Saturated sand
filled void
• 3.5m width
• Over 20m in length
• Depth to solid rock,
13m
M17 M18 Gort to Tuam PPP SchemeBallygaddy Overbridge Linear Karst Feature- Geophysics • Resistivity Profiles and Ground Penetrating Radar to verify location • Additional drilling to determine ground condition for foundation M17 M18 Gort to Tuam PPP Scheme
Ballygaddy
Overbridge –
How did we fix this
on site?
• Void infilled with Class
6C material
• Slab spanning feature
• Supporting overlying
structure
M17 M18 Gort to Tuam PPP SchemePavement Design Mainline - Analytically designed Flexible Composite Pavement Non-Project Road – Standard Method • Why analytical design? • Common on many PPP Projects • Based on customising design to locally available materials and construction methods • Maximise whole life value • Additional testing in situ • No negative construction tolerances M17 M18 Gort to Tuam PPP Scheme
Why Flexible Composite Pavement?
• Site won Aggregate – very significant limestone rock ideal for aggregate
• Sustainable use of Material
• Cost Efficiency
• Flexible Composite design in soft ground?
• Assumed foundation CBR of 15% proved through testing
• Primary settlement fully achieved and significant secondary settlement achieved through
maintaining surcharge beyond required design period
• Use of geosynthetics as reinforcement to pavement layers eg Kilmore Roundabout
• Reduced crack induced spacings to 2m.
• All of this reduced the potential for settlement or reflective cracking
M17 M18 Gort to Tuam PPP SchemeComparison of Analytical and Standard Pavement Construction
Mainline – 56msa and CBR >15%
Layer Clause Material Grade of Analytical Standard
Binder Thickness Thickness
Surface 942 SMA 10 surf 30 30
Course PMB 65/105-
60 des
Binder Course 929 AC 20 dense 40/60 55 55
bin des
Upper Base 929 AC 32 dense 40/60 75 95
base des
Thickness of Asphalt 160 180
Lower Base 822 CBGM B 180 180
C12/15
Sub-base 808 Type B 100 300
Capping 613 6F1 or 6F2 - 150
Total Thickness (mm) 440 610
M17 M18 Gort to Tuam PPP SchemeEnvironmental Challenges cSAC – Candidate Special Area of
Conservation,
pNHA – Potential National Heritage Area,
SPA – Special Protection Area,
• Scheme encroaches into the catchment area of a
SNR – Statutory Nature Reserve
number of SACs their associated river networks
• Lough Corrib SAC
• Abbert River
• Grange River
• Coole – Garryland Complex (SAC, pNHA, SPA, SNR)
• Kiltiernan Turlough (SAC, pNHA)
• Rahasane SAC
• Dunkellin River
• Scheme is also adjacent to Nationally rare plants
– Mudwort, Dropwort, Alder, Buckthorn, Lady’s
Tresses, Orchid and Wood Bitter Vetch
M17 M18 Gort to Tuam PPP SchemeEnvironmental Challenges
Whooper Swan Pine Martin Bewicks
Swan
The habitats of
protected
species that are
located within
the scheme
Otter Lesser Horsehoe Bat
M17 M18 Gort to Tuam PPP SchemeEnvironmental Mitigation M17 M18 Gort to Tuam PPP Scheme
Environmental Mitigation –Bats • EIS - “Guidelines for the Treatment of Bats during the Construction of National Road Schemes” – DMRB • Bat Conservation Ireland - Consultation • Early Landscaping Works • Bat Hop-Over Points - consisting of diamond shaped areas with existing or semi mature tree vegetation either side of the road – 2.5-3.5m in height at 5-7m centres • Stone Cladding and Bat Boxes provided on River Bridges catering for all bat species M17 M18 Gort to Tuam PPP Scheme
Environmental Mitigation – Lesser Horseshoe Bats
• Lesser Horseshoe Bats
• International Importance
• Dramatic declines in population in Ireland
and extinction in parts of Europe
• Coole Green Bat Bridge
• Only bridge of its kind in Ireland
• Twin Arch Structure
• Hedgerow vegetation to guide bats
• Feeding grounds either side and a roosting
site in Kiltartan Cave
M17 M18 Gort to Tuam PPP SchemeStructures - Coole Green Bat Bridge • Twin Arch Pre-Cast Concrete Buried Structure • 1:2 sloping elevations topsoiled and landscaped M17 M18 Gort to Tuam PPP Scheme
Structures - Ballygaddy Overbridge
Concept Design
- Cambered Steel Beams
- Long span variable depth beam bridge
Plan on Highway Alignment Elevation on Concept Design
Crest Curve –
330m Radius
M17 M18 Gort to Tuam PPP SchemeDetailed Design
• Innovative precast concrete pretensioned super-Y beams
• 40m Span, 16m wide, 16deg Skew
• Varying depth beams – parabolic top profile
• Level beam soffit
M17 M18 Gort to Tuam PPP SchemeRathmorrissy Junction
• 3 Level Motorway to M6 to
Motorway Interchange Galway
• Largest junction in Ireland
• Circulatory Carriageway –
1km – longest in Ireland
• Design Optimisation
• Roundabout - Oblong Shape
• Reduced Earthworks
Heights
• Reduction of radii on
structures
M6 to
• Steepened Slopes Dublin
• Reduction of over
100,000m3 achieved
M17 M18 Gort to Tuam PPP SchemeRathmorrissy Junction
• 5 Bridge Structures
Required
• 3 Underbridges carrying
the M18 mainline over the
circulatory carriageway
• Single Spans over the
existing M6 – no works in
median
• Overbridges over the live
M6 motorway installed at
night
• Eastbound – rolling
closures
• Westbound – closure and
local diversions
M17 M18 Gort to Tuam PPP SchemeOperations and Maintenance
Phase / Life-Cycle
Niall Lyons, DR General Manager Operations Stage
M17 M18 Gort to Tuam PPP SchemeO&M Requirements
• 25yr O&M Contract for the Project
Road, Project Road being smaller in
extent than the road constructed
• Availability based contract
• No tolling of the road
• O&M requirements set out in
Schedule 7 – very prescriptive
maintenance and inspection
requirements
• Operations to be carried out in
accordance with TII Publications and
the Traffic Signs Manual
M17 M18 Gort to Tuam PPP SchemeO&M Phase Set Up
• Long term O&M Contractor (A-way Lagan
Infrastructure Services aka ALIS)
• PPP Co responsible for lifecycle works
• Extensive plant & equipment required to
provide O&M services
• Centrally located depot
• Long-term local employment
• All employees are local.
• Local specialist subcontractors –
pavement testing, plant hire
M17 M18 Gort to Tuam PPP SchemeWinter Maintenance
• Precautionary treatment where ice, frost
or snow conditions are forecast to occur
• 3 winter maintenance routes, all to be
completed within 2hrs
• Duty Officer and winter maintenance
team on call 24/7
• Use of pre-wet system
• Plant & Equipment
• 4no. Prewet gritting trucks with snow
ploughs
• Brine batching plant
• 1000 tonne salt store
• Vaisala ice forecast software
• Weather Station
M17 M18 Gort to Tuam PPP SchemeWinter Maintenance – Storm
Emma
• Storm Emma – 26th February to 4th March
• Storm Emma in numbers;
• 34no. Prewet treatments
• 27no. Dry treatments
• 350 tonnes salt used
• Procured additional gritter and loading
shovel
• Hotel rooms booked for staff
• Gritting and ploughing non stop for 3
days
• All lanes kept open
• Particular issues
• Getting to motorway
• No traffic to help activate the salt
M17 M18 Gort to Tuam PPP SchemeAsset Management -
RMMS
• Steanne Solutions Geoworks 7 RMMS used for all asset
management excl Structures and major capital structural
maintenance of pavements
• All inventory on Project Road recorded via As Built survey and
inputted into RMMS
• Requirements of RMMS
• Store and manage inventory data
• Take details of Safety and Detailed Inspections and turn
them into a program of work
• Produce schedules of inspections and required cyclical
activities
• Be able to produce lists of outstanding Defects grouped
together by date, category, activity or Defect
• Have facility to audit performance
• Have an archiving feature to maintain records
• All defects are categorised – Category 1 , Category 2 High,
Medium and Low, Category 3
• All defects have a required initial response time and permanent
repair time
M17 M18 Gort to Tuam PPP SchemeStructures Maintenance
• 75 no. Structures on Project Road (32
over bridges, 14 under bridges, 15
gantries, 4 river bridges, 10 others)
• PPP Co uses the Authority’s Bridge
Management System – Eirspan
• Inspections include weekly Overseer
inspections, annual routine
inspections, principal inspections
every 6 yrs and special inspections as
required
• Routine inspection identifies
maintenance requirements for the
year. Work orders are raised through
Eirspan
M17 M18 Gort to Tuam PPP SchemeEmergency Response
• Ensure emergency response team
availability for 24hrs a day everyday,
to facilitate any necessary Lane
Closures
• Attendance within maximum 1 hour
and 1.5hours out of normal hours
• Must have plant and equipment
available at all times including
• Liaise closely with the Emergency
Services and adjacent maintenance
contractors (MMaRC B JV, N6
Operations and Galway County
Council)
M17 M18 Gort to Tuam PPP SchemeAccidents
• The collision rate per km on the old N17
and N18 was 0.29 in 2014.
Cause of Road Traffic Accidents
• The collision rate per km for the first 338 18 18 18 18
days on the M17M18 motorway is 0.16 16
• Equal spread of accidents due to; 14
12
• Driver Error – drivers typically state 10
that they made an error i.e. pressed 8
accelerator instead of brake, pulled out 6 5
in front of another vehicle etc 4
2
• Hail – driving too fast during wintery 2
conditions 0
DRIVER HAIL MOTORIST UNKNOWN VEHICLE
• Unknown – typically unreported ERROR LOST
CONTROL
FAULT
barrier or signage damage, or driver OF MV
could not explain reason for accident
M17 M18 Gort to Tuam PPP SchemePavement Testing - SCRIM
• SCRIM testing carried out annually to
Lane 1 and all slip roads
• Lane 2 tested every second year
• Contract sets out minimum SCRIM
Coefficient values based on the road
type
• Investigatory Levels
• Minimum Performance Levels
• Handback Levels
M17 M18 Gort to Tuam PPP SchemePavement Testing- Road
Surface Profiler
• Road Surface Profiler (RSP) used to
measure
• International Roughness Index(IRI)
• Mean Profile Depth (MPD)
• Rut Depth
• Measured same frequency as SCRIM
• Minimum performance and
investigatory levels set out in the
contract and in the TII standards
• Structural capacity of the pavement is
measured using Falling Weight
Deflectometer every 4 years
M17 M18 Gort to Tuam PPP SchemeLifecycle/Handback Requirements
• The Authority effectively gets a new motorway
back at the end of the concession period
• Lifecycle model determining the maintenance and
renewal requirements
• A number of key assets will require replacement
prior to handback including
• Pavement – extensive minimum performance
levels must be achieved in addition to a
residual life of 10 years
• Fencing
• Safety Barriers
• Signage
• Lighting
• ERT etc
M17 M18 Gort to Tuam PPP SchemeQ&A M17 M18 Gort to Tuam PPP Scheme
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