The International Seat Of Power, De Kroon

Project: The International Seat Of Power, De Kroon

With spectacular views over The Hague and the North Sea beyond, the 41 storey De Kroon forms a centrepiece in the extensive Hague New Centre redevelopment project.

Designed by leading architect Christian Rapp, the built up city centre site created a number of logistical challenges for the construction team and with the safety of both workers and pedestrians near the site a priority, a range of safety solutions from market leader Combisafe were specified.

During the construction of any building, there is no room for complacency when it comes to the risk of objects and debris becoming airborne and falling.  Injuries at ground level can range from minor cuts to concussions, blindness or death, all of which can be exacerbated due to high winds on tall buildings but prevented by using the appropriate safety measures.   Faced with this safety issue on the 131 metre De Kroon and also having to provide edge protection for the workers at height, Combisafe provided its very latest Safety Net Fan and Steel Mesh Barrier.

Adjacent to Richard Meier's City Hall and the Dutch Dance Theatre, the €65 million building will offer 45,000 m² of space when completed and will be home to residential units, offices and retail space.  The Concrete Association have recently awarded De Kroon the concrete prize for the housing category with the Jury praising the building’s “timeless architecture of international allure”.

Built as a joint venture between contractors BAM and Ballast Nedam, it was essential this residential tower had cutting edge safety solutions that would effectively negate the risk to anyone working at height and to protect the workforce and pedestrians at ground level.

For the construction of the steel framed building, the contractors employed a self-climbing formwork system that allows the walls and floor slabs to be cast in one operation in a daily cycle. For this efficient and cost effective building method, this system has integral working platforms which on De Kroon were easily adaptable with the Combisafe Safety Net Fan.

Offering protection for both the workforce and pedestrians from falling objects and debris, Combisafe specified 20 units of the Safety Net Fan.  The versatility of the Safety Net Fan allows for easy repositioning and attachment and is ideal for high rise protection. With a projection of 3 metres, the Safety Net Fan is tested to comply with EN1263 and will absorb falls from up to 6 metres. The mesh density of the fall arrest net is 60 x 60mm and is delivered laced together with an extra fine 20 x 20mm debris net as standard. The combined net is able to catch and contain considerably smaller particles of debris and therefore offers complete protection for people at ground level.

Installed at the same level of the self-climbing formwork scaffold, it was critical that when the formwork tunnelling was moved up a level, the Safety Net Fans were in place to protect workers below against falling objects.

For edge protection Combisafe supplied over 300 units of its lightweight and versatile Steel Mesh Barrier. Available in two standard sizes 2.6 metres and 1.3 metres, the Steel Mesh Barrier is essentially guardrail, toeboard and mesh rolled into one and has the added benefit of being able to span trades, accommodating their different edge protection needs at different phases of the construction project.  The forerunner in edge protection for over a decade, this temporary fall prevention system was installed on the slab edge of floors using the Combisafe Multi Foot.  

‘The Safety Net Fan proved to be the best solution because it was so easily adaptable with the self climbing formwork system and offered protection against falling objects to the workers below’ said  site director Henk Lensink

For more than two decades, Combisafe International has set the standard in safety at height technology, delivering preventative and protective systems for the construction industry. The Safety Net Fan and Steel Mesh Barrier fit perfectly with the company ethos of designing solutions that eliminate or minimise the risk of working at height.