Pile Type: Contiguous & Bearing
Number of Piles: 35no.
Diameter: 750mm
Depth: 23m
Enabling works were carried out under the existing bridge, to install the new foundations in advance of the bridge removal.
Pile Type: Contiguous & Bearing
Number of Piles: 35no.
Diameter: 750mm
Depth: 23m
The project required the construction of piles within a height restriction of 4.5m beneath an existing bridge. The works were to be carried out below live road traffic and also adjacent to a live railway.
The strata compromised a cementitious sand material with water ingress encountered at 4m requiring both hard digging and long casings.
Martello was required to construct 35no, 750mm diameter contig/bearing piles to depths of up to 23m whilst working to a tight programme to meet the possession and bridge lift.
Martello utilised 2 of their low headroom MP4000 series rigs enabling works to be carried out under the existing bridge, to install the new foundations in advance of the bridge removal, thereby reducing the programme. The piles were excavated under water using digging buckets and a bypass auger, the piles were then tremmied and the water pumped into waste tanks ready to be PH monitored and treated prior to disposal.
The Martello rigs enable rail and road bridges to be replaced and repaired with minimal disruption to transport by allowing new foundations to be installed without removing the existing structure. The compact nature of the Martello rigs allows multiple rigs to be employed to meet programme requirements.
Project name
Cardiff Splott Road
Category
Bridges, Railways, Road works
Techniques
Large diameter bored pile under casing, Restricted access bored piling, Contiguous Pile Wall
Contract type
Build
Location
Cardiff, United Kingdom
Client
Carillion
Building Period
2017 - 2017