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
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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