TARA STREET STATION REDEVELOPMENT

 

Appendix B

Construction Phasing Commentary

Introduction

The proposed Works at Tara Street Station comprise an Air Rights Development above a brand new state-of-the-art concourse facility. It is a requirement that the station, which is one of the busiest in Dublin, remains operational at all times during the implementation of the development. This mandate requires careful phasing of the Works to provide a station facility that is both adequately protected from the construction activities and is operationally safe in terms of passenger flows and capacity. It is also a requirement that revenue protection is maintained throughout project implementation.

To achieve these key objectives, a construction process comprising 18 phases has been developed, and is described and illustrated in this Note, which primarily focuses on the impacts on the station. The proposed phasing utilises temporary access stairs, partial stopping up of adjacent roads, and the opening up of the arches for use as the temporary station concourse during construction. The phasing also utilises the Townsend Street entrance, and makes key assumptions regarding its use and facilities.

Within the 18 phases described, there are four different arrangements for passenger access in and out of the station and to and from the platforms. These are:

1. Existing Situation
2. All access from the east side of the railway arches and utilising the space beneath the arches. Public totally excluded from the west side of the railway arches. Northbound platform accessed via a temporary stair located on Poolbeg Street.
3. New stair and escalator access to Northbound platform introduced. Narrow access route from George’s Quay introduced on the west side of the railway arches. Southbound platform accessed via temporary stair located on Luke Street.
4. New concourse opened in full, with principal access from Tara Street and secondary access from George’s Quay. Entry and exit points to east side of the railway closed except for emergency escape. Up and down escalators, new stairs and lifts providing access to both platforms.

In broad terms, access arrangement 1 is only possible during the advance and enabling works. For all of the building works that involve basement excavation, secant pile wall construction, and construction of the building up to transfer structure level (floor 3), the public must be totally excluded from the west side of the railway arches so access arrangement 2 is required. Once the transfer structure and 3rd floor base slab are in place, works in the concourse area can commence and public access to the west side of the railway arches can start to be re-introduced. At this stage, access arrangement 3 can be deployed while the building progresses towards its uppermost floors. Station concourse fit out is not reliant on the building topping out and the top floor plant rooms being fitted out, as the station services are proposed at lower levels. Thus access arrangement 4 may be possible before the building works are completed.

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Phase A – Advance Works (Site Clearance)

• Access Arrangement 1 (Existing)
• Erect hoardings to establish construction site limits;
• Demolish Tara House on the corner of Tara Street and Poolbeg Street;
• Demolish O Reilly’s pub in the arches to the south eastern corner of the site, and prepare/line arches for re-use as station concourse;
• Install lifts at the Townsend Street entrance, to ensure all-user access to both platforms throughout construction.

Phase B – Advance Works (Temporary Concourse and Accesses)

• Access Arrangement 1 (Existing)
• Partial closure of Poolbeg Street (eastbound carriageway) to create site compound and allow installation of temporary stair access to the northbound platform;
• Prepare cleared arches for use as station concourse and fit-out for temporary access and revenue protection.
• Create temporary station access points on east side of railway arches (via Luke Street and George’s Quay)

Phase C - Existing accesses to Northbound platform no longer available. Pedestrian access to the station entirely from the east side of the railway.

• Access Arrangement 2 (East side only)
• Building construction progress – floors -1 to 3
• Open temporary concourse and east side accesses to the public
• Close existing George’s Quay entrance and hoard off west side of railway arches.
• Commence earthworks to create basement.

Phase D (Complete Earthworks West Side)

• Access Arrangement 2 (East side only)
• Building construction progress – floors -1 to 3
• Temporary removal of the Quayside ATM to provide access to the shop under the arches
• Remove the existing northbound stairs, lift and escalator ready for the construction of the new concourse.
• Commence the basement walls and core

Phase E (Basement Construction and Waterproofing)

• Access Arrangement 2 (East side only)
• Building construction progress – floors -1 to 3
• Install the pile secant wall structure and piles for the columns of the tower structure.
• Complete the basement wall structures ready for the ground floor slab to be constructed
• Complete the ground floor slab under the proposed stairs, lift and escalator to the northbound platform

Phase F (Structural Works to Transfer Structure)

• Access Arrangement 2 (East side only)
• Building construction progress – floors -1 to 3
• Complete proposed stair, lift and escalator access to the northbound platform
• Finish/make good northbound platforms once the columns of the building are at platform level
• Progress the main structure up to the transfer level and construct the 3rd floor slab
• Progress station concourse and building core beyond 3rd floor slab

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Phase G – New northbound platform accesses brought into use

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Open new northbound platform access.
• Remainder of station concourse under construction
• Building construction continues above floor 3.

Phase H (Transfer of Activity to East Side 1)

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Remove the temporary stairs on Poolbeg Street as they are no longer required.
• Demolish eastern platform lift to provide space for the temporary stairs to be provided in Phase I.
• Arrange partial closure of Luke Street (northbound carriageway) for temporary access to southbound platform and construction compound.

Phase I (Transfer of Activity to East Side 2)

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Install temporary stairs for access to Southbound platform (re-use of temporary stairs for northbound platform), utilising northbound carriageway on Luke Street.
• Establish new entrance from George’s Quay, tight against west façade of railway arches.
• Revise site hoardings to suit

Phase J (Commence East Side works)

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Open Luke Street temporary stair re-open west Quayside access
• Reopen the access to the shops
• Hoard off southbound platform stairs ready for demolition and close east side access from George’s Quay.

Phase K (Southbound access removal)

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Demolish the existing southbound platform stair, and prepare area for new lift and stair access.

Phase L (Southbound escalator removal)

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Remove existing southbound platform escalator, and prepare area for installation of new escalators in Phase M

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Phase M (New Southbound accesses installation)

• Access Arrangement 3 (New Northbound Access)
• Building construction progress – floors 4 and above
• Install the new escalators, stairs and lift tower to provide access to the southbound platform
• Make good southbound platform to suit new accesses.
• Progress concourse fit out

Phase N (Instate new southbound platform accesses)

• Access Arrangement 3 / 4
• Building construction progress – floors 4 and above
• New escalators, stair and lift accesses to the southbound platform commence service.
• Remove the temporary stairs to southbound platform and revise site hoardings.

Phase O (Secondary stair access to southbound platform)

• Access Arrangement 3 / 4
• Building construction progress – floors 4 and above
• Construct the new second stair access to southbound platform.
• Complete the platform works in this area

Phase P

• Access Arrangement 3 / 4
• Building construction progress – floors 4 and above
• New southbound platform accesses fully operational.
• Complete concourse fit out to include barriers and ticket office

Phase Q (Open new concourse in full)

• Access Arrangement 4
• Building construction progress – floors 4 and above
• Open the new concourse access and hoard off the temporary barriers ready for removal
• Construct the security office to the north of the new ticket barriers

Phase R (Works Complete)

• Concourse fully operational – Platform canopy sheeting/Glazing to be progressed once tower is complete and crash deck cladding (if required) can be removed.

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