Underwater reinforced concrete is the future

Date: 20/04/2013

The demand for underwater reinforced concrete will only increase in the future. This is what Marc Dröge of Disa Civiele Constructies believes. “Using underwater reinforced concrete will ultimately offer financial benefits; the dimensions of the foundation piles and sheet pile walls can be reduced considerably.” 


Disa Civil is a part of Disa International and its core business is installing underwater reinforced and non-reinforced concrete. Dröge: “There are basically no underwater jobs that we cannot fulfil. In addition to pouring underwater concrete, we are involved in related activities. Examples are ensuring construction pits and cofferdams are ready to receive the concrete including inspections of interlock openings and sludge, cleaning walls and piles, sludge suctioning and adding reinforcement. Our divers, however, also master all welding, burning and construction activities. We have noticed that the demand for underwater reinforced concrete is becoming ever greater. Floors can be much slimmer and sheet pile walls and foundation piles need to be less long. It does not just offer financial benefits but, from a planning perspective, a shorter period of time is needed to install a reinforced concrete floor. Moreover, part of the superstructure's reinforcement can already be poured in the underwater concrete.”

The foundation

Dröge rightly states that more time will be involved during the preliminary stage with regard to such a working method. Nevertheless, Disa Civil foresees a great future for underwater reinforced concrete. “We like nothing more than to hold meetings with the building team during the early stages. This ensures that any inconvenient issues in the execution phase can already be tackled during the preliminary stage.”

Dröge believes that an important issue  when pouring underwater concrete (regardless of whether it is reinforced or not) is guaranteeing supply continuity. “The quality of the concrete is the determining factor for the ultimate quality of the floor. The flow degree of the concrete must simply be sufficiently high. We pour by using a floating pipe and a float that ensure that the concrete will not segregate. The issue is ensuring that the concrete continuous to flow. The process may not come to a standstill. A laser guides it to the pouring process; we do not pour based on water levels because this would not be sufficiently accurate. We, therefore, aim for zero tolerance but actually use a tolerance of approximately 7.5 centimetres. We can basically make anything with our ingenious system. Pouring under a gradient, a double gradient … it is all possible. Divers monitor continuously the process' progress, check the pouring front and, if required, suction away the sludge.”

 

For further information please contact:
Heidi Schets
Telephone: +31 10 340 05 22
Email: h.schets@disa-international.com

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