Oosterschelde | Deltaworks
The biggest, hardest and most expensive part of the Delta Works was the Oosterschelde storm surge barrier. This partially permeable closure of the Oosterschelde is also viewed as the “eighth wonder of the world.” The barrier was built between 1976 and 1986.
There were other plans first, because the corpse was actually intended the Oosterschelde barrier with a solid finish. In April 1967 the first began this work. The working ports Schelphoek (Schouwen-Duiveland) and Sophia (North Beveland) and platforms Roggenplaat (1969), Neeltje Jans (1970) and North Country (1971) were completed. After the construction of dams connection between the platforms and damaanzetten was at the end of 1973 all five of the nine kilometers wide Oosterschelde completed. There were three holes to close: Legs, Scissors Roggenplaat and Roompot. This would be using cable cars are closed. The twelve carrier towers above were placed in 1972.
Why are the plans changed? Prompted protests were against a complete closure under the motto “Open Oosterschelde. Pending a final government decision, all preparatory work in July 1974 suspended. A turbulent period in which the Oosterschelde high on the political agenda. The decision was long. That the issue was difficult was the appointment of a special committee, the Committee on Eastern Scheldt, which had completed its advice on ‘open’ or ‘close’.
Eventually the government decided not fixed but a storm surge barrier with sliding dam building.Direct consequence of this decision was that in winter 1976-1977 the carrier towers planned for the cable car were removed.
The newly devised plans for the barrier consisted of large concrete pillars, at the bottom of the Oosterschelde rest. Between the pillars hanging scroll by the storm surge barrier to be closed. On the barrier is a path of several concrete elements.
Construction begins in 1978 from the work island Neeltje Jans that from Schouwen-Duiveland reached by 2780 meters long bridge support. Then follows the construction of building docks for the construction of the pillars. In April 1979 started the construction of the cornerstones in July 1981 was commissioned to manufacture the slides.
Again there were problems because the heavy pillars required a solid surface. To increase the bearing sand was compacted to 15 meters deep. The specially developed for this compaction vessel Mytilus long needles stuck in the ground and shook it so that the sand grains were sitting closer together. From early 1980 to late 1982 it was working on this.
After the soil was compacted it had further strengthened and plain. This was a special plant on Neeltje Jans plastic mats, filled with various kinds of gravel. The foundation mats were laid by the carpet-layers and Cardium Dos 1. Then filled the stone and the joints asfaltstorter January Heijmans with different stones. The mats were between November 1982 and June 1984 submitted.
After the carpet was ready mats could be placed pillars. For the construction of three large pillars, 15 meters deep docks built construction. In April 1979 started the construction of the cornerstones in building docks. During 1983, the first pillars finished. The docks were a building for a flooded so hefschip Ostrea pillars could light up and could bring to their final location. In August 1983, the first pillar on top.
A total of 65 pillars placed 16 in the northern final gap Hams, Scissor final gap in the middle 17 and 32 in the southern Roompot final gap. The 66th pillar, the pillar reserves, it was no use.
Through the pillars to connect with all kinds of prefabricated elements came only a real barrier. The main element was the shift to high water closed. The slides consist of large pipes constructions. On August 29, 1984 placed the floating crane Taklift 4 the first slide, on June 26, 1986, the last placed. In 1987 the gates were even “European steel prices.
Finally it is there: Queen Beatrix said on 4 October 1986 the Oosterschelde storm surge barrier officially. Flanked by former Minister of Transport Kroes and Director General of Rijkswaterstaat engineer J. Dixhoorn she spoke of the historic words “The storm surge barrier is closed. The Delta Works are completed. Zealand is safe. ” On January 1, 1987 wearing the Delta barrage over to the Department Public Works Department Zealand. The road on the barrier still left here to wait. On November 5, 1987 Princess Juliana was it for the opening rijverkeer. Only in July 1988 was the last work on the barrier in order.