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<p>In October 1944, a 20.9m span footbridge was built in Brussels (Belgium) across the Canal Charleroi-Brussels: it was the first applications of prestressing by post-tensioning to a concrete bridge-type structure in Belgium, and one of the earliest worldwide. The tendons consisted of high strength steel wires 5mm in diameter anchored in so-called « Sandwich » anchorages, a system of post-tensioning developed in Belgium from 1942 onwards by Professor Gustave Magnel with the Blaton-Aubert Company. This system will be extensively used in Belgium during the next 20 years, and was also applied to build the first prestressed concrete bridge in the US in 1949 (Walnut Lane, Philadelphia). The dead weight of the footbridge is 60 tons. Some years ago, the local Authority had decided that this footbridge had to be replaced. This 1944 prestressed concrete footbridge was obviously an engineering heritage structure, but preserving it in use somewhere else raised many problems in terms of reliability. The authors therefore proposed to the Authority to study in depth this historical structure in order to collect information that could be useful to assess the durability and actual carrying capacity of concrete structures built with the same prestressing technology in the period 1945-1965, many of them still standing. The paper presents the main findings from the load testing of this footbridge, that took place in October 2018, and the results from the characterization of its materials.</p>
This paper is a review of the civil engineering heritage of Belgium, one of the series of country profiles being published by Engineering History and Heritage. It is presented under four headings: ‘Belgium’s major civil engineering achievements’, ‘National and regional recognition of engineering heritage’, ‘Exemplar conservation of engineering structures’ and ‘Information sources for engineering heritage’. This profile discusses engineering structures of heritage importance, including the following, all built before 1945: several canals (in chronological order: from Brussels to the Rupel; from Pommerœl to Antoing; from Charleroi to Brussels; the Centre canal, with its four hydraulic boat lifts; the Albert canal, from Liège to Antwerp, with its Vierendeel all welded bridges); the Palace of Justice in Brussels; the Gileppe dam; the forts of Meuse River; the Mativa footbridge in Liège; the hall of exhibitions Palais 5 in Brussels; and the first prestressed concrete railway bridge project in the world. The profile lists organisations in Belgium active in helping conserve its engineering heritage, including the Flemish Association for Industrial Archaeology, Museum of Industry, Work and Textiles, Patrimoine Industriel Wallonie-Bruxelles and BruxellesFabriques/BrusselFabriek, and concludes with a short list of sources of information allowing the reader to find further information about Belgium’s civil engineering heritage.
The paper will illustrate the contribution of research into Construction History in condition assessment or residual carrying capacity situations for three old types of concrete constructions. We will address: -the problem of assessing the actual carrying capacity of "Hennebique" reinforced concrete type beams with their characteristic reinforcement system, widespread in many countries before the First World War.-the replacement of the external post-tensioning tendons within a hollow box girder railway bridge built in the early 1960s with the "Blaton-Magnel" anchorage system developed in Belgium from 1941 onwards, and used until the early 1960s, in Belgium and abroad.-the structural assessment of thin concrete hyperbolic paraboloid shells, which were highly popular with architects and engineers in 1950s-1960s.
Nous avons relaté -dans une monographie intitulée "Le Pont-rail en béton armé sur le Lualaba à Kongolo" -l'effort considérable accompli par la Cie C. F. L. pour supprimer la solution de continuité de son réseau entre Kongolo et Kabalo.Cette Jonction demandait des ouvrages importants, à exécuter dans des conditions particulièrement difficiles : il s'agissait de traverser le Lualaba -gros fleuve impétueux -, la Lukuga -large rivière qui coule à faible pente dans une plaine perméable -et plusieurs autres rivières.
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