VSF has installed the foundations for the new Ramspol Bridge for Infrateam N50.
On land these were in situ TVSi piles and precast concrete piles and, in the water, the foundation consisted partly of a combi wall pit for the bascule basement and large steel tubular piles for the rest of the pillars. The TVSi piles had a maximum length of around 26 metres and were driven with the Woltman 7528. In water, the piles were driven with a Sennebogen 6100 on our own piling pontoon. The piles under the bascule basement are up to 28 metres long with a diameter of 762 mm; the piles for the water pillars are up to 29 metres long and have a diameter of 1420 and 1620 mm and weigh up to 25 tonnes. Next to the water pillars, VSF installed the piles for the roughly 200 metre long temporary bridge, which facilitated accessibility of the pillars. The personnel, rebar and the concrete were transported over the bridge and then further processed with a crane barge.
In May 2011, once VSF had started driving the TVSi piles for the land pillars of the new Ramspol Bridge, we started installing the piles for the pillars in the water. The piles were first vibrated up to the load-bearing layer and then driven using a diesel hammer. The work was carried out with two type 6100 Sennebogen crawler cranes on our own piling pontoons equipped with winches and spuds for the positioning. The piles were placed with a piling frame that is adjustable in two directions, so the piles could be installed within the very tight tolerances with the additional help of two surveyors.
The new Ramspol Bridge will span the Ramsdiep and the Ramsgeul between the current Ramspol Bridge and the existing inflatable rubber dam.
This new bridge, roughly 13 metres high, 550 metres long and 34 metres wide, will have a navigationa width of around 50 metres in the Ramsdiep and Ramsgeul
A total of 10 pillars have been built, one of which is integrated into the bascule basement.
The northern abutment is founded on connectable steel piles, the two land pillars on vibration-free soil displacement piles (TVSi piles).
The bascule basement is founded on a pit in combi wall, the southern abutment on concrete piles and the remaining pillars on large steel tubular piles, 14 per pillar.
In addition to the piledriving, VSF also supplied and fitted the new fenders round the pillars and the adjacent inflatable rubber dam.
The main contractor Infrateam N50 consortium, a joint venture consisting of Boskalis, Hollandia and VolkerInfra (including Koninklijke Wegenbouw Stevin and Van Hattum & Blankevoort).