04-566-8566       1 Aglionby Street Melling Lower Hutt 5010
Client: Transpower NZ Ltd
Construction Value: $1.3 M
The pour for this concrete project for Transpower NZ took 12 hours with 2 pumps and supply plants working continuously. It is amongst the largest continuous concrete pours in the North Island. At 820m3, it measures 46.4m x 13.8m, and is 1.3m thick. It also incorporates 5 large steel plates, measuring 5.2m x 3.8m and 50mm thick, made by Ashurst Engineering.
Constructed to house 5 transformers, each slab was pre-drilled with 186 HD25 threaded holes to connect the various transformers into place. Because placing of the slab was crucial, 40mm vibrators were used to ensure correct flow and dispersal.
Extensive strength testing was undertaken on the transformer pad to ensure that the NZ3104 standard was reached, and these tests were re-administered after 5 and 28 days to confirm strength and performance. Temperature probes were inserted into the concrete and the electronic readings were sent back to the technicians at Firth.
Special Info / Challenges:
ADC was nominated by Transpower for their National STAR Awards for this project. These awards recognise the importance of health and safety in Transpower’s business.
The supervisor for this project brought over 35 years experience in concrete pumping and placing to the construction of this huge transformer pad.
Due to the sheer size of this pour, and because Firth Palmerston North did not have multiple plants, they teamed up with competitor Allied Concrete for batching, to ensure the project was a success.