Mobilis CroonWolter&dros renovates movable part Haringvliet

The new steel bridge valve is already under construction at Hollandia Infra in Krimpen aan den IJssel. This will be installed and put into use in the summer of 2023. Renovation work in the bridge’s basement will start in January 2023. Due to the fast pace, this renovation is not a standard project. We are using different working methods than usual and the entire project organization aims to be ready by the end of 2023.

Schröder is integral design manager for concrete and steel and has worked at Mobilis since 2009. “Before, I worked for consulting firms, so you are primarily concerned with plans and procedures. Since the switch to the contractor side, I have been directly involved in the implementation. Then you see what happens with your plan.’

He has various roles in the renovation of the Haringvliet bridge. He is technical manager, integral design manager and design manager of the civil part of the work.

Short project lead time

“Proportionately, there is not much concrete work” says Schroeder. “The basement roof needs to be taken off and on again, and some new concrete parts need to be built in the basement.”

For most projects, the design process consists of different phases: from a preliminary design, to a final design and finally to an implementation design. As the lead time for this project is very short, we have already made designs for a number of components in the initial phase. The drawings of the bridge valve, for example, were already ready for implementation, and the designs for the drives are also ready.

CMCH is further developing other components. We now have designs on different levels, they all need to be connected to each other. We will do that in the coming months, turn the individual components into a whole.’

Started building right away

Not only the design process is different. Schroder:The ultimate project starts with 3 months of setting up your team and looking for people with the right specialist knowledge. After that you need about 3 months to learn everything about your project, then you start designing and finally the construction starts. Because in this case the design is already largely done by Rijkswaterstaat, we immediately started to build on parts such as the steel valve.’

We work well with the Rijkswaterstaat team and we make plans together. It saves a lot of time.

‘Together with the company Rusthoven, mechanical engineering installations, we went in depth from day one. For example, we made agreements with Rijkswaterstaat on drawings and production, and materials were ordered. We work well with the Rijkswaterstaat team and we make plans together. It saves a lot of time’.

‘Meanwhile, we have also been able to build our own team. At the moment we have an organization with 60 people and we work together with companies that have a lot of knowledge and experience with such large projects.’

The implementation of the project

In 2023, the Haringvliet Bridge will be closed to road traffic for 7 to 8 weeks in June and July. During these weeks, all drives will be renewed, the bridge valve replaced and the control, monitoring and control systems installed.;

Schroeder:Before the end of the year, we will set up our construction site on the north-east side of the bridge. This will be our cabin and we will make room for storing materials. A large pontoon is located on the water that goes to the side of the bridge basement. We can deliver and remove materials via this pontoon.’

‘At the beginning of January 2023, we will really get started, we will fix the bridge flap so that it can no longer move, and then remove parts from the bridge basement via the pontoon on the side. Think about the engines, the gear train and the control cabinets.’

The traffic on the bridge doesn’t notice. It is different for waterway traffic, the bridge can no longer be opened from early January and is therefore closed to ships taller than 13 m. This will last until autumn 2023, when the operating, control and monitoring systems have been installed and thoroughly tested.

We create a work area around the moving part. Cargo lower than 13 m can pass under the fixed part south of the bridge.

Welding 2000 hours every week

The new valve is being built in a large hall at Hollandia Infra in Krimpen aan den IJssel. This consists of a steel flap over which the traffic will soon pass, and a counterweight or ballast box which is needed to make the bridge move.

Loose steel sheets are delivered to the hall, where they are processed and welded together. A mega job, according to Schröder. ‘With 50 people, it takes us a few months to assemble the bridge. There are 2000 hours of welding each week.’

‘When the welding is finished, the bridge gets 2 layers of preservation for an extra long life. There will then be a lump of steel of 2050 tonnes. We have reserved the 2 largest floating sheerlegs in the Netherlands to hoist the bridge during the period when the bridge is closed to traffic. And although the equipment and materials are large and cumbersome, the tire must be positioned with an accuracy of 1 mm, otherwise the bridge cannot open and close properly’.

“We are planning everything in detail. We are also in the process of purchasing all materials. It is quite difficult, because much is currently difficult to deliver. Computer chips are a well-known example, they have long delivery times.’

‘Various materials for operation and control of the bridge have already been ordered by Rijkswaterstaat. We also work together a lot in that area. We are therefore also looking at alternatives, but the prices are skyrocketing. Do I like the project? Yes, it’s fun and exciting. We have a very good team. The people we have on board are the specialists in the Netherlands, I have faith in that.’

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