Metro North, Dublin - Construction Explained

Metro North Dublin – Construction €2.4bn

IncludedRoute Programme GraphicTunnelling ConstructionStations ConstructionCost

DetailsLengths

Overall 18 kmTunnel 7.5 kmCut & Cover 2.7 kmViaduct 2.25 kmRoad Level 5.5 km

Stations 15 Nr.Underground 9 Nr.Road Level 6 Nr.

Tunnels & Underground Stations

Route

3D image to show Sequence, Method & Plant.

David H Moloney

29th June 2016

Purpose of presentation to give the Public,

Stakeholders and Politicians an understanding of

the Construction, Cost and Timeline ⓒ David H Moloney

Schematic Longitudinal Profile

Project Execution Plan

Table of Contents

Overview

Route of Metro Northⓒ David H Moloney

Schematic with Principal QuantitiesDavid H Moloney


ⓒ David H Moloney

Programme - Time Chainage Diagram

ⓒ David H Moloney


TBM TBM

Tunnel TunnelTunnelViaduct Along Street

Programme Animation

ⓒ David H Moloney


Cost Comparisons of Metro Projects

Dubai Route 2020UAE (To Start)

Red Line North DohaQatar (In Progress)

Red Line South DohaQatar( 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 /k m €140 million / km €108 million / km €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 Tunnel x 2

Cut & Cover 0 2.7 km 0

Elevated 10.5 km 2.2 km 0 Not applicable

Road Level 0 5.5 km 0

Stations 7 Nr. 7 Nr. 5 Nr. 14 Nr. 3 Nr. Not applicable

Capacity 13,000 Passengers per hour

19,800 Passengers per hour

? Not applicable

ⓒ David H Moloney

Advantages of Rail 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 General Items

Contractor’s Temporary Site Facilities

ⓒ David H Moloney

Brief Description

Contractors Site facilities comprise:Offices, Canteens, Toilets, Drying Rooms, Stores, Plant Yard, generators and Workshops.

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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

Quarry & Aggregate Production


ⓒ David H Moloney

Reinforcement Cutting & Bending Yard David H Moloney

ⓒ David H Moloney

Reinforcement in 12 m lengths. Delivery in 3 ton Bundles Reinforcement cut to length by Shearing Machine

Reinforcement Bent to Shape by Bending Machine Reinforcement that is cut and bent is Bundled for delivery to work site

Site Hoarding examples

ⓒ David H Moloney

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Wheel Wash Drive-throughG

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Weighbridge & Sheeting Access

ⓒ David H Moloney

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Sheet Pile Temporary Shaft

ⓒ David H Moloney

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Brief Description

Sheet Pile Temporary shaft is used to enable an excavation for a deep structure.The construction sequence is:Install sheet-piles.Excavate and install bracing.Excavate to final level.Construct concrete structure.Backfill, remove bracing and sheet-piles

Sheet Pile Temporary Shaft

ⓒ David H Moloney

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3D Animation to show Sequence

FalseworkG

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Brief Description

Falsework to support Bridge deck formwork

Dewatering

ⓒ David H Moloney

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Brief Description

Construction dewatering is the removal or drainage of

groundwater and or surface / rain water usually by

pumping to keep the works dry.

Dewatering

ⓒ David H Moloney

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Dewatering by Wellpoints

ⓒ David H Moloney

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Dust Suppression

ⓒ David H Moloney

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Temporary Fence type 2

ⓒ David H Moloney

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Brief Description

Temporary fence on precast beam for airport.

Traffic Management

ⓒ David H Moloney

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Brief Description

Traffic management plans are necessary when working on or beside roads

Traffic Management - Realign Motorway under new Bridges

ⓒ David H Moloney

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Health, Safety & Environmental

Existing Underground Utilities

ⓒ David H Moloney

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Brief Description

Before digging

establish the location

and route of

underground utilities.

Locator to find Utilities

Spray Paint to mark pavement

Existing Underground Utilities & Overhead Cables - Safety Measures

ⓒ David H Moloney

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Safety Precautions

HSE Monitoring & Reporting - Dashboard Dashboard is a single page, graphical representation of

current HSE Issues and historical trends

Environmentally Friendly Site Air, Noise, Water & Soil Pollution

Water Pollution PreventionG

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Geotechnical

Diaphragm Wall Construction - Sequence, Plant & Methods


For construction details see my YouTube Channel

ⓒ David H Moloney

Earthworks



David H Moloney

ⓒ David H Moloney

Excavate & Load, Cart, Tip & Return

Brief Description

Cycle Time for 7km haulage distance using an Excavator 45 tonne weight and Dumper with a 40 tonne capacity, the cycle time is 34 minutes

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7 minutes

14 minutes

3 minutes

14 minutes 7 km

7 km

Underground Station Excavation

Underground Station Construction

Rock Excavation Underground

Excavate with Roadheader

Drill & Fit Rock Bolts

Spray Mortar as Lining

Excavators with Rock Breaker& Rock Rotary Cutter

Roadheader

ⓒ David H Moloney

Using Mining Techniques

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

Brief Description

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

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Station Excavation - Soil on Rock Situation

Rock Nailing, Rock breaking & Excavation

ⓒ David H Moloney

Concrete

Tunnel Wall Segments Casting

Clean Mould

Lift Precast Segment out of mould

after 18 hours.

Reinforcement

fabricate

Reinforcement

into Mould

Concreting

Segment Storage

Casting Cycle Time 24 hrs

ⓒ David H Moloney

Tunnel Precast Segments

Reinforced Wall Construction Sequence

ⓒ David H Moloney

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Brief Description

The sequence to construct a reinforced concrete wall is as

follows:

Tie the reinforcement.

Erect stop-ends and the wall shutters.

Pour and vibrate the concrete mix.

Remove the shutters after the concrete has hardened.

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Cycle Time Pour per Day

Reinforced Wall Construction Sequence

ⓒ David H Moloney

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Reinforced Structure Construction Sequence

ⓒ David H Moloney

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Brief Description

The general sequence to construct a reinforced concrete tank

is as follows-

1. Construct the floor and wall panels in a hit and miss pattern.

2. Construct the floor and wall corners and T shape panels.

3. Construct the roof working outwards from the back.

Reinforced Structure Construction Sequence David H Moloney

ⓒ David H Moloney

Bridge & Post-tensioningC

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Brief Description

The sequence to post-tension a bridge

deck is as follows;

Fix the ducts and anchorages.

Install the stressing strand.

Concrete the deck.

Stress the strands and lock at

anchorages.

Grout the ducts.

Bridge & Post-tensioningC

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Bridge Construction Sequence David H Moloney

Piling Surcharge Abutments

Remove Surcharge AbutmentsDeck centre

Post-tensioning Fascia & Waterproof deckComplete Bridge

PiersOverview

Deck Ends

Images with Schematic 3D view, Photos & Timeline

ⓒ David H Moloney

Post-tensioning Bridge Deck David H Moloney

Waterproofing Spray on SystemM

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Waterproofing Spray on TestsM

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Underground Stations David H Moloney

ⓒ David H Moloney

Large Floor Concrete Pour

Rail ViaductC

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Brief Description

Shown is the construction of a light rail viaduct where

an overhead gantry was used to lift and place the

precast concrete viaduct segments.

Viaduct Construction



David H Moloney

ⓒ David H Moloney

Viaduct Construction David H Moloney

ⓒ David H Moloney

Viaduct Segments Launching

ⓒ David H Moloney

Viaduct Segments Casting David H Moloney

Casting Method

The concrete segments are manufactured

using the short-line, match-casting method.

Match-casting is when sequential segments are poured against the previous cast segment, this ensures that the segments will fit perfectly on site. Horizontal and vertical curves are achieved by setting the cast segment at a rotation in either or both axis to the mould used to cast the next segment.

ⓒ David H Moloney

Viaduct Segments – Short-line, Match Casting Method

David H MoloneyMatch-casting is when sequential segments are poured against the previous cast segment, this ensures that the segments will fit perfectly on site.

Cycle Time 24 hrs

Piling

Piling Construction - Plant & Methods

Brief Description

Piling Plant, Equipment and Material;

Crawler Crane, Piling Hammer, Temporary Casing,

Piling Rig, Concrete Pump, Concrete Mixer Trucks,

Tremie Pipe and Reinforcement Cage

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Piling Construction - Plant, Methods & SequenceP

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Piling Construction - Plant & MethodsP

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Piling Construction - Vertical PilesP

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Piling Construction - Raking PilesP

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Pile Load Test

ⓒ David H Moloney

Pili

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Brief Description

A jack is used to load the pile in steps and

gauges measure any settlement.

Roads & Paving

Asphalt Batching YardR

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Road Construction Sequence Animation

Tunnel

Tunnel Design

Twin Tunnels single track with Cross passages at 250m intervals for emergency evacuation

Tunnels in rock to avoid ground & building settlement. Depth 25 metres on average

ⓒ David H Moloney

Cut & Cover Tunnel Construction

Sequence -Traffic and utilities are diverted, excavate trench, construct & backfill to bury.

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

batter the faces, diaphragm walls, secant piles or a combination of soil nailing and

shotcreting.

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 Boring Machine (TBM)

Cutting Head rotates to Dig

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 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

Miscellaneous Works

Fencing

ⓒ David H Moloney

Sequence of Construction

Clear Scrub & Grade ground

Fix Corner & Strainer Posts

Fix Intermediate Posts

Fix Line Wire, Chain-link & Razer wire

Concrete ground beam

Progress Monthly, Monitoring & Reporting - DashboardDashboard is a single page, graphical representation of current

progress and historical trends

Histogram Charts for Resources & Outputs

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

Organogram

Brief Description

Shown are the line and

lateral relationships

between the various team

members and their relative

position in the site

organisation.

Other Projects

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

Production by David H Moloney

See my YouTube Video on Dublin Metro North

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

ⓒ David H Moloney

https://www.youtube.com/channel/UCeJR9J7svhBd-C0ZoAH2fhQ

Metro North, Dublin - Construction Explained

Engineering

Transcript of Metro North, Dublin - Construction Explained