The Challenge
The fundamental principle and objective of these works were to design and construct a means to repair a failed section of surface water pipe located within a critical area and 3m below ground level.
The location of the pipe work was such that an innovative and dynamic approach to reconstruction was required with significant operational and environmental constraints.
Scope of Works
The original scope of works included trench excavation for the entire run. This required significant temporary works internally, with structures created within a concessions unit to segregate the works from staff and the public. The temporary structure was to extend outwards with the dig.
Due to the disruption and cost of this approach Ryebridge designed a methodology which not only saved cost and time but minimised disruption to the retail outlets.
This method involving Thrust boring under the landside area travelling the 13-metre distance under the retail unit to a manhole in the main terminal. The project involved an exposed 20m trench at a depth of 3 metres up to the boundary wall of the retail unit from the central search area.
Then the Manhole was set-up with a concrete installed wall to facilitate the Thrust bore for the remaining run under the retail outlet and into the main terminal.
Essential key works:
Site set-up with noise reducing hoarding and security access gate
Liaison with airport stakeholders around life safety system, alarms etc.
Saw cut and break out concrete using electric BROKK
Machine and hand dig trench to depth of three metres
On night works remove spoil through terminal. Over 100 tonnes manually removed
Install trench sheets
20 metres new drain run
Install two new manholes
Install concrete back-wall for thrust bore
Thrust bore 13 metres
Manhole connections
Reinstate, concrete floor tiling
CCTV to prove run
All works were completed on time and to budget.
