Dart Underground, Rail Network, Dublin €2bn? - Construction

IncludedProgramme

Construction

3D images

Photos

Details

Cost

Heuston Station

ChristchurchSt Stephen’s Green

Pearse Station

Purpose of presentation to give the Public, Stakeholders and

Politicians an understanding of the Construction, Cost and Timeline

DetailsLength in Tunnels 5 km Stations 3 Nr.Cross passages 15 Nr.Evacuation Shafts 6 Nr.

David H Moloney16th May 2016

ⓒ David H Moloney

Locations of Proposed Dart Underground Stations

Heuston Station St Stephen’s Green Pearse Station

ⓒ David H Moloney

Cost Comparisons of Projects

Dubai Route 2020UAE (To Start)

Red Line North DohaQatar (In Progress)

Red Line South Doha Qatar

( In Progress)

Metro NorthDublin

(Proposed)

Dart UndergroundDublin (Proposed)

Port Tunnel Dublin

(2005)

Overall Cost €2,450 million €1,803 million €1,500 million €2,400 million €2,000 million ? €752 million

Cost per km €158 million / km €140 million / km €108 million /k m €134 million / km €400 million / km

?

€134 million / km

Overall Length 15.5 km 13 km 14m 18 km 5 km 5.6 km

Tunnel 4 kmSingle Tunnel

11.6 km Twin Tunnels

14 kmTwin Tunnels

7.5 km Twin Tunnels

5 km Twin Tunnel

4.5 kmRoad Tunnels

Cut & Cover 0 2.7 km 0

Elevated 10.5 km 2.2 km 0 na

Road Level 0 5.5 0

Stations 7 Nr. 7 Nr. 5 Nr. 14 Nr. 3 Nr. na

Capacity 13,000 Passengers per hour

19,800 Passengers per hour

? naⓒ David H Moloney

Heuston

Christchurch

St Stephen’s Green

Pearse Station

Ramp

Tunnel

Underground Station

ⓒ David H Moloney

Programme

Schematic Longitudinal Profile

3D Underground Station Construction

Tunnel Boring Machine

ⓒ David H Moloney

Underground Station Construction

Underground Station Excavation

Secant Pile Construction - Sequence, Plant & Methods

Underground Station Excavation

ⓒ David H Moloney

Piling Construction - Plant & Methods

3D image to show Plant. For construction details see my YouTube Channel

Plant & Equipment

Crawler CranePiling HammerCasing Piling RigConcrete PumpConcrete Mixer TrucksTremie PipeReinforcement Cage

ⓒ David H Moloney

Diaphragm Wall Construction - Sequence, Plant & Methods

3D image to show Sequence, Method & Plant.

For construction details see my YouTube Channel

ⓒ David H Moloney

Station Excavation - Soil on Rock Situation

Rock Nailing, Rock breaking & Excavation

ⓒ David H Moloney

Bed Rock - Type & Depth

Ramp Construction

Sequence -Traffic and utilities are diverted, excavate, construct and backfill to sides.

To prevent the faces of the excavation from collapsing, different measures are used – batter

faces, diaphragm walls, secant piles or a combination of soil nailing and shotcreting.

ⓒ David H Moloney

Tunnel Design

Twin Tunnels single track with Cross passages at 250m intervals for emergency evacuation.Ventilation & Evacuation Shafts along the route

Tunnels in rock to avoid ground & building settlement. Depth 25 metres on average ⓒ David H Moloney

Tunnel Boring Machine (TBM)

Cutting Head Rotates

Excavated material removed by conveyor belt

Lifting muck to surface with skip

Placing Concrete Segments

Tunnel Boring Machine (TBM)

Cutting Head rotates

7 nr. Precast segments form rings that line the tunnel Excavated material removed

by conveyor belt

ⓒ David H Moloney

Tunnel Wall Segments Casting

Clean Mould

Lift Precast Segment out of mould

after 18 hours.

Reinforcement

fabricate

Reinforcement

into Mould

Concreting

Segment Storage

Cycle Time 24 hrs

ⓒ David H Moloney

Tunnel Precast Segments

ⓒ David H Moloney

Rock Excavation Underground

Excavate with Roadheader

Drill & Fit Rock Bolts

Spray Mortar as Lining

Excavators with Rock Breaker& Rock Rotary Cutter

Roadheader

Tunnelling Methods

Tunnel Fit-out Rail, Electricals, Ventilation

Tunnel Fit-out

Install Sleepers & Rails

Concrete Batching Train for Floor Slab

Drilling Machine for Utilities Brackets

Commissioning, Testing, Handover & Opening

Purpose to test and ensure that everything (e.g. trains, escalators, lifts, ticket barriers) works as it should.

ⓒ David H Moloney

Diverting Existing Underground Utilities

ⓒ David H Moloney

Bed Rock - Type & Depth

Ground ConditionsThe limestone bedrock is between 5 and 25 metres below ground level. The overlying deposits are generally boulder clay with thin layers of sand and gravel. The water table is between 2 and 4 metres below ground level.The Bedrock Geology Map of Ireland, gives the rock as limestone and mudstone, along the tunnel route.

Rock - Excavability

The excavability of rock depends mainly on the rock strength and the layer thickness. This diagram shows excavation methods for rock of various strengths and thicknesses, with a free face.

ⓒ David H Moloney

Vehicular & Pedestrian Traffic Diversions

Saint Stephen’s Green O'Connell Bridge

ⓒ David H Moloney

Ways to ease Traffic Congestion Benefits of Metro to commuters

1. Time saving for commuters 4. Reduction in accident

2. Reliable and safe journey 5. Reduced fuel consumption

3. Reduction in atmospheric pollution 6. Reduced traffic congestion

Contractor’s Temporary Site Facilities

ⓒ David H Moloney

Quarry & Aggregate Production

3D image to show Sequence, Method & Plant.

Concrete Batching Plant David H Moloney

ⓒ David H Moloney

Concrete batching plant comprises - concrete mixer, control cabin, silos for cement and fly ash, aggregate bins and conveyor belt system to feed the mixer. Also aggregate storage bays and water storage tanks. The mixing is computer controlled and has a dynamic screen display, showing the process. Material storage capacity to match two days concrete production

Main Quantities, Resources & Schedule of Outputs used to Programme

Activities Main Quantities Outputs

• Tunnelling 5km 12 to 20 metres per 24hour day per TBM

• Resources – TBM, Conveyor for removing excavated material, Crane at Launch Shaft

• Piles 900mm diamater 25m long xxx Nr.• Resources Piling Rig, Crawler Crane, Bentonite Mixing & Storage

• Excavation for Stations in Clay Top Down xxxxx Cu M• Tracked excavator 30 tonne

• Excavation for Stations in Rock Top Down xxxxx Cu M• Resources

• Excavation Rock Underground xxxx Cu M• Resources

• Concreting xxxx Cu M• Truck mounted concrete pump, shuttering,

Histogram Charts for Resources & Outputsused to programme

Concrete, Manpower, TBM,

Manpower per Discipline Concrete per Location

Numbers for each month of the Project Quantity for each month of the Project

ⓒ David H Moloney

Progress Monitoring & Reporting - Dashboard

ⓒ David H Moloney

Dashboard is a single page, graphical representation of current progress and historical trends

Plant & Equipment List & Job Titles ⓒ David H Moloney

Luas Dublin’s Tram / Light Rail Network

Luas – Dublin, Tram / Light Rail System Construction Sequence & Methods

Install Traffic Control Fencing & Welfare Facilities Divert Underground Utilities Excavate

Prepare Formation Reinforcement & Rails Paving

Paving Information Sign Trams in Operation Trams in Operation

Reinforcement & Rails

ⓒ David H Moloney

Metro North Project Details Summary David H Moloney

Schematic Longitudinal Profileⓒ David H Moloney

Notes - DART Underground, Dublin

• The Dart Underground is a proposed underground rail system that will run under the city centre, and connect Heuston Station with Pearse Station a distance of 4 kilometres. At the proposed St Stephen’s Green interconnection Station, on the route, passengers will be able to transfer to the Metro North and go to the Airport.

• Programme. This graphic representation of the Construction Programme has a time line and 3D image. A motion animation effect is used to move the time bar in time with the highlighted areas of works, examples are, for the cut and cover ramp, station construction and tunnelling

• Station construction, illustrated is the sequence, methods and plant used to construct an underground station using secant piles. Alternatively diaphragm wall could be used.

• Tunnelling Operation and resources, sequence and methods. The proposed design is for twin tunnels with cross passages at 250 metre intervals, for emergency evacuation. Generally the tunnels will be 25 metre deep and in rock to minimise the probability of subsidence of buildings.

• Rock Excavation Underground. Roadheaders and excavators with hydraulic rock breakers are used. Rock Bolts are used to tie the exposed rock back into the self-supporting rock. The exposed rock is lined by blasting a mortar or concrete using a hose and nozzle. Wire mesh may be used.

• Underground Utilities Diversion. Will be necessary at the locations of Stations, Ventilation Shafts and cut and cover ramps.

• Vehicular & Pedestrian Traffic Management. The aim is to allow construction to proceed efficiently while minimising the level of inconvenience and disruption that the work will cause.

• Video Communications are ideal for Stakeholders and Politicians, to get an understanding of how a project will be constructed and its timeline.

• The DART, an acronym of (Dublin Area Rapid Transit) is an existing electrical rail system that runs North South, along the coast from Malahide in north Dublin to Greystones in Co. Wicklow.

• The trains are known as EMU i.e. (Electric Multiple Unit) that consist of self-propelled carriages, powered by overhead electric cables

Construction Infographics

Runway Construction – Methods, Sequence & Plant

Bridge Construction – Methods, Sequence & Plant

Motorway Construction – Methods, Sequence & Plant

Seaport Construction – Methods, Sequence & Plant

See my YouTube channel for further details

My YouTube Channel link: https://www.youtube.com/channel/UCeJR9J7svhBd-C0ZoAH2fhQ

ⓒ David H Moloney

See my YouTube Video on Dublin Metro North

My YouTube Channel link: https://www.youtube.com/channel/UCeJR9J7svhBd-C0ZoAH2fhQ

By David H Moloney