De Oversteek, Nimègue, Les Pays Bas_

The city of Nijmegen formulated the specification of the bridge in a document outlining their ambitions. Within this, design criteria were laid down which helped to set out the project.

A first issue concerns the placement within the surroundings. The urban bridge has to form an integral part of the riverscape, and be both seen and experienced from the banks as well as from the bridge itself. A second criterion requires the design to be consistent with the existing and future image of Nijmegen in terms of the relocation of the dyke and the spatial developments around the Waal River. This means that the main construction has to stand in relationship to the whole programme and function in an ideal way as a major piece of traffic infrastructure. A third ambition describes the bridge as a work of art that, in a single gesture, articulates contemporary technology and design. The fourth criterion focuses on the function and experiential value of the bridge: the urban bridge should create an ‘urban plaza’, both on deck and at ground level, as well as a pleasant environment underneath.

Integral approach

The design provides more than one answer to all of these questions. The roots of our design culture are reflected in the physical laws of stability and in construction craftmanship, but also in the landscape, the topographical conditions, the city and its history: the traditions and the culture of a place form a starting point. Our design approach starts from ‘the nature of things’. We utilise the valuable elements that can be found within the very broad context of the project. In addition, the economics and the organisation of financial processes, decision-making procedures and regulations, operate according to their own logic and systems: today, this needs to be planned and incorporated into complex construction projects. This is what we understand by the integral approach. By proceeding in this way, we are confident that our projects generate unpredictable added value, differentiate themselves from the existing surroundings and, on top of that, set other transformations in motion.

An integral approach also means that all the parties involved, from various disciplines and functions, rise to the challenge. There is permanent communication: this is non-hierarchical and based on the belief that this is essential when dealing with modern day complexities.

Design of the bridge

The design of the bridge is a staging. It is a theatrical response to the majestic nature of the Waal River, the floodplain and the two embankments. The urban bridge brings structure, hierarchy and orientation to the landscape. The arch, which is the main feature, both confirms and spans the river. Unlike a purely functional span across the water, the arch respects the width of the river and thus endorses the location of its banks. Even in winter, when the water levels are higher and the floodplain overruns, the arch remains convincing proof of the location and identity of the Waal. The design of the bridge is based on a structural logic that takes, as its starting point, the principle that the geometry is determined by the forces at work. We do not choose forms for their own sake, but use the forces to develop a shape. The forces thus become a design tool. Once the basic geometry can be fixed, the ‘composition’ or materialization of this form can be investigated. The need for a new bridge provided the opportunity to create a 21st century arch bridge, a contemporary icon of Western culture. The Waal Bridge as a counterpart and ‘monument of its time’ raises expectations even higher in terms of formal and engineering ambitions.

The ramps of ‘De Oversteek’ are designed from a range of materials and construction methods that relate to nature. It involves traditional techniques (cast in situ concrete and brick masonry) that create a feeling of craftsmanship. The design, materials, dimensions and detailing of the ramps, unlike the arch bridge, are elaborated on a human scale. The new bridge is designed with an integral approach, using a combination of contemporary knowledge on master planning, construction techniques and conceptual design. The bridge is the result of a well thought-out process of optimisation combining engineering with urbanism and architecture. A principle aim of the design process is to make the structural efficiency visible. There are no added ‘counterfeits’. The bridge is coherent and logical in relation to physical laws. Natural beauty is a consequence. The main span of the arch bridge is 285m long; the total length of the structure, the arched bridge including the approach ramps, is 1,2 km.

Design et construction: 2009 – 2013

Design: Ney Poulissen Architects & Engineers, architecte Chris Poulissen ingénieur Laurent Ney

Maître d’ouvrage: BAM, Max Bögl

Artiste: Atelier Veldwerk

Site: Nijmegen, NL

Dimensions : 47500 m2 surface construite , “bow bridge” 285 m, longeur 1.2km

Budget:141.000.000 euro exc. TVA

www.nijmegen.nl et www.ney.be

Ouverture d’un des plus grands ponts des Pays-Bas, le ‘Oversteek’ à Nimègue, le  23 novembre 2013. Ce nouveau pont s’intègre dans un vaste développement de la Ville de Nimègue et de la ‘Rijkswaterstaat Nederland’ (l’Administration Centrale Néerlandaise de la Gestion des Eaux) visant à donner plus d’espace pour les crues des fleuves suite aux changements climatique et à l’élévation du niveau de la mer. Le nouveau pont urbain est un des ouvrages d’infrastructure de grande échelle cadrant dans ce projet.

Ney Poulissen, architectes et ingénieurs belgesluxembourgeois sont les auteurs de ce projet. Ils ont été engagés, ensemble avec l’association d’entrepreneurs BAM Max Bögl, à l’issue d’un concours négocié de conception-réalisation organisé par la Ville de Nimègue.

Fin novembre, un livre de photos comprenant des reportages sur la construction du pont sera publié par Editions Van Tilt. Laurent Ney, l’ingénieur de la maîtrise d’œuvre, prépare également une publication sur ce projet pour le même éditeur.

Ney-Poulissen Architectes & Engineers sont les auteurs du projet du pont. En 2009 il ont gagner cette commission sur base d’un concours internationale. La création d’un pont pour une ville est une sorte de mise en scène dans l’environnement urbain. La réponse théâtrale est en relation avec la grandeur de la rivière, des berges et des rives. Le pont structure l’environnement. L’arcade, la pièce principale, accentue la rivière au delà de la largeur du chenal. Vu la nécessite de construire un nouveau pont au-dessus du Waal il était important de créer une structure qui symbolise le 21ième siècle et qui sera une icône contemporaine.

“De Oversteek” est une construction d’un niveau très haut niveau d’ingénierie et de langage formel. Les travées d’accès sont le résultat d’une combinaison de différents matériaux et techniques de construction locaux. Autrement dit, les techniques de construction sont traditionnelles (béton coulé sur place et maçonnerie en brique). Grâce à leur design, matériaux, dimensions et détails, les travées d’accès relèvent de l’échelle humaine. Le pont est le résultat optimal d’une intégration d’un ouvrage d’art dans son environnement paysager et urbain. But de cette construction est de visualiser l’efficacité de la structure. Il n’y a pas d’ajout supplémentaire sur le pont. Il est cohérent et conforme aux règles physiques. La beauté naturelle en est la conséquence.

 

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