Ashford Castle Spa and Pool, Co. Mayo

Mar 30, 2015

Byrne Looby recently completed the design of a secant pile retaining wall and capping beam on behalf of Murphy International, for the development of a new spa and pool at the five star Ashford Castle in Cong, Co. Mayo.

The magnificent Ashford Castle is set in 350 acres, on the picturesque shores of Lough Corrib in Co. Mayo. Dating back to 1228, the castle is currently entering its final stage of a full refurbishment. The main contractor completing the works is Galway based Maveric Contractors, with O’Connor Sutton Cronin acting as Engineer. The secant pile wall was required in order to allow for the construction of a new spa and pool facility toward the south elevation of the castle.

The ground conditions consisted of water bearing gravels overlying very strong Limestone bedrock, between 2.0m and 5.0m below existing ground level. The original castle foundations are founded on the shallow rock level, with the rock level falling south towards Lough Corrib.

Pictured: Installation of Capping Beam

In order to limit differential settlement of the 3 storey architectural glass canopy to be constructed over the spa and pool, all gravels were required to be excavated to the top of bedrock level, with lean mix concrete then to be placed to the underside of the pool structure at 3m below ground level. As a result the retained heights varied between 2.5m to 5.0m.

In order to achieve the required rock sockets within the very strong Limestone bedrock Murphys installed 1200mm diameter piles at 1035mm centres.

Byrne Looby also designed a temporary capping beam to support the secant pile retaining wall at high level during the excavation works, in order to further limit the requirements for drilling long rock sockets.

Pictured: Installation of Secant Pile Wall                                                                                           Pictured: Excavation and Placement of Lean Mix

(pictures provided by Maveric Construction)