2021 North West Bridge Rehabilitation Programme, Mayo Bridges – Contract 1

Project Description

P&D Lydon carried out this scheme that involved refurbishment work to 7 National Road Bridges, located on the N5, N26 and N59 in County Mayo.

The bridge structures are as follows:

MO-N05-014.00, Little River Bridge
MO-N26-006.00, Foxford Bridge (Protected Structure Reg No. 31206002)
MO-N59-002.00, Ballina Lower Bridge (Protected Structure Reg No. 31204105)
MO-N59-003.00, Knockadangan Bridge
MO-N59-010.00, Bellacorrick Musical Bridge (Protected Structure Reg No. 31302702)
MO-N59-011.00, Post Office Bridge
MO-N59-044.00, Newport Bridge (Protected Structure Reg No.)

Client: Mayo County Council

Project Timeline: June 2021 – July 2022

Role: Main Contractor, PSCS

The scope of the project included:

Little River Bridge: This bridge comprised of two different sections of construction.
- Section 1: A three-span stone masonry arch bridge supported on stone masonry abutments and piers.
- Section 2: A reinforced concrete slab extension on the south side with a single span of approximately 7.2m.
- Works involved:
  - Re-waterproofing of the concrete deck slab.
  - In-stream works including scour remedial works to damaged sections of the stone masonry invert channel (North and South spans).
  - Construction of a new concrete apron slab across the full width of the stream at the downstream end.
Foxford Bridge: A redundant dry arch on the approach to the main River Moy bridge.
- Filling the advanced arch with concrete, restoring it back to its original feature.
Ballina Lower Bridge: Masonry arch structure with four equal spans of 10.7m over the River Moy.
- Infilling scour holes using grout-filled concrete bags placed manually by divers at low tide.
- Grout tubes were used to fill each bag, preventing grout escape into the river.
- Rock-filled nylon bags installed from road level via crane.
- Removal of soft materials from scour depressions using vacuum suction pumps operated by divers.
Knockadangan Bridge: Three-span composite precast concrete beam / reinforced concrete deck slab structure.
- Replacement of existing sub-standard parapets with new metal parapets.
- Removal of carriageway surfacing for installation of a spray-applied waterproofing membrane and new deck movement joints.
- All works conducted from carriageway level with temporary construction access platforms.
Bellacorrick Musical Bridge: 4-span masonry arch structure over the Oweniny River.
- Repairs to localised undermining of the West bridge piers and riverbed scour depressions.
- Installation of drainage channels at road level.
- Work undertaken by Contracts Supervisor Anthony Byrne and stonemason Michael Farrell (trained by Traditional Lime Co. LTD.).
Post Office Bridge: A structure with two sections—a single span masonry arch (downstream) and a reinforced concrete slab extension (upstream), each spanning 2.15m, totaling 11.23m.
- Creation of new embankments.
- Construction of four reinforced concrete wing walls.
- Provision of vehicle safety barriers.
Newport Bridge: Three-span masonry arch structure over the Newport River (Black Oak River).
- Minor repairs to damaged stone masonry invert in the center span.
- Repairs to cracked masonry on abutments and piers.
- Repointing areas with mortar loss on abutments and piers.

2021 North West Bridge Rehabilitation Programme, Mayo Bridges – Contract 1

Project Description

The scope of the project included:

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