270 Used software: Allplan Engineering Introduction In the vicinity of the Dutch national airport ‘Schiphol’, local economic growth already leads to congestion of traffic on both highways as provincial roads. In the near future, the area will be used for further development as European ‘Greenport’, which will lead to further increase of traffic. The present provincial road N201 crosses the villages Uithoorn and Aalsmeer. By the foreseen traffic growth, the road becomes increasingly a barrier for both villages. This is unacceptable, regarding the living conditions of the inhabitants. Therefore, the provincial road will be diverted around both villages, and be suited for future economic development. In 2005, the Province ‘Noord-Holland’ launched a ‘Design and Construct’ tender for the mayor part of the project. It comprises 8 kilometres provincial road, several viaducts and a tunnel, length 1400 metres, crossing the drainage and shipping canal of the Haarlemmermeer-polder, in which Schiphol Airport is located. Originally, Witteveen+Bos advised the contractor (Heijmans and Boskalis) for the tender design. Since the contract is awarded, the contractor and the client started an Alliance in order to optimise both process as design. From start, Witteveen+Bos is involved in the Alliance and provides design works for all construction stages of both tunnel, road works and viaducts. Tunnel ‘Ringvaart’ The tunnel consists of two traffic tubes, separated by an emergency tube. Each traffic tube is provided with a two lane road. Due to its covered length, safety installations such as ventilation equipment, camera surveillance and lighting will be installed. Also the tunnel will be equipped with an operating facility. Presently, the northern part, crossing the canal, is completed. By the end of 2008, the navigation channel of the canal will be repositioned in order to build the southern part. The sections are constructed in an open pit consisting of sheet pile walls and an underwater concrete floor. However this construction principle is well known as ‘cut and cover’, some innovations are applied as well. Instead of a traditional (temporary) underwater concrete floor, a reinforced underwater concrete slab is applied. This structure has a permanent function and will not be provided with a separate concrete slab on top of it. As a result of this construction method, construction time is shorter, the number of foundation piles is reduced by half and construction costs are lower. Reinforced Underwater Concrete Floor Because of its permanent function, the underwater concrete floor will be reinforced. Therefore prefabricated reinforcement cages are installed at a maximum depth of 10 metres below the water surface. Together, the reinforcement cages provide CAD Engineering, Engineering work and special structures 7 Witteveen+Bos Contact Sander ten Pas Address Leeuwenbrug 8 7411 TJ Deventer, Netherlands Phone +31 570 69 77 69 Email [email protected] Website www.witteveenbos.nl Witteveen+Bos provides consultancy and engineering services for projects in the following areas: water, infrastructure, environment and economics. A multidisciplinary project approach characterises our way of working. Our clients are governmental, commercial, and industrial, including various types of joint ventures and public private partnerships. We serve them from eight offices in the Netherlands and four offices abroad. For our 750 employees partnership is the key word: partnership with their clients and with Witteveen+Bos. Personal development is also a key issue because our work constantly demands new expertise and new responsibilities. Accountability to our clients is important to us. Our employees (at the same time our shareholders) share this sense of responsibility. High-profile projects Examples of high-profile projects where Witteveen+Bos has been involved are the northsouth metro line in Amsterdam, the development of man-made islands for oil and gas winning in the Caspian Sea, a 350 hectare land-reclamation project in Sochi, an island in the shape of Russian Federation, known as Federation Island, the Amsterdam-west sewage water purification project, construction of the Delft railway tunnel, development of systems to allow the passage of fish alive at pumping-stations, the master plan for the centre of Amsterdam International Airport, various large and divers contracts in Central and Eastern Europe and al large number of projects in the Netherlands and abroad. Innovation Innovation in projects has been one of the most important foundations of the success of Witteveen+Bos. A few examples of innovative developments are the social costs and benefits analysis, ‘Charted Dutch safety levels’, ‘Partners for Roads’, UV water treatment in Andijk and Berenplaat, the decontamination of soil at railway yards and the first Reinforced Underwater Concrete Floor a permanent function. Tunnel ‘Ringvaart’ The project regards a tunnel consisting of two traffic tubes, separated by an emergency tube. Each traffic tube is provided with a two lane road. The sections are constructed in an open pit consisting of sheet pile walls and an underwater concrete floor. However this construction principle is well known as ‘cut and cover’, some innovations are applied as well. Instead of a traditional (temporary) underwater concrete floor, a reinforced underwater concrete slab is applied. This structure has a permanent function and will not be provided with a separate concrete slab on top of it. As a result of this construction method, construction time is shorter, the number of foundation piles is reduced by half and construction costs are lower. Owner: n/a Architect: m. Izendooren General Contractor: Alliantie-N201 Engineering Office: Witteveen + Bos Construction Start: 01/01/2007 Construction End: 01/01/2011 Location: Aalsmeer, Netherlands Project Information Short Description
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