NCC has full control over the casting of the Centralen underground station

Published 2022-08-09

Simply and safely without interference. This is how Ida Alexandersson and Staffan Johansson review the yellow loggers from the Celsicom Easy Connect measurement system used to remotely monitor the casting of an underground train station.

During work on Stage Centralen, an underground section of the West Link in central Gothenburg, we had a chat with the project team on site. On behalf of the Swedish Transport Administration, NCC was responsible for the construction of an underground station called Station Centralen. 35 Celsicom TC603 loggers were placed at various locations in the huge concrete shell, continuously delivering valuable data from the casting of concrete slabs, outer and inner walls and roofs.

Monitoring cooling and concrete status
The yellow concrete loggers enable efficient and safe remote measurement. This is what Staffan Johansson and Ida Alexandersson, supervisor and deputy supervisor respectively at NCC, said when they reflected on the work on the concrete shell for the 700 meter long and 50 meter wide train station. During the pour, 1,700 cubic meters of concrete were used to pour a 940 square meter concrete slab. Some of the data loggers monitored the temperature of the water cooling the concrete, to ensure the correct curing process.

Two other concrete computers recorded the temperature evolution of the concrete during the curing process through two measuring wires each embedded in the concrete.

– Everything has worked very well. There were no disturbances at all and the concrete computers logged every ten minutes, which meant we got very reliable strength curves,” says Ida.

The measurement system has been easy to use from the very beginning, she says.

– The day we got them here, we could start using them right away. Just peel off a small sticker and they were connected directly to the login(in the Celsiview cloud service) that we have – and started measuring immediately. It was very smooth, no problems at all.

Staffan agrees. The yellow temperature loggers have made the job much easier, he says.

– We have had full control over the temperature of the concrete. All such updated information is available at all times on your computer or mobile phone. This meant that we could, for example, go in and immediately say: Okay, now we have the right strength for the structure – let’s demolish the mold.

For NCC, the Celsicom loggers provide security during work on the underground station, the train tunnel and other parts of Stage Central.

– I think the most important thing is that you can quickly check if there is an interruption. Nowadays you spend more time inside than outside. Then it feels good to be able to easily go to our site and see if all measuring points are running,” says Staffan Johansson.

Ida Alexandersson adds:

– You can more easily keep track of what is happening. If a test lead is pulled out, you will see exactly what time this happened.

Safe concrete pours
The 35 existing data loggers will be in operation until NCC finishes the concrete work for this stage of the West Link.