Hidak Komárom-Esztergom megyében (Esztergom, 2001)

dr. Tóth Ernő: Összefoglalás

The deck reinforced concrete bridge by Garamkövesd was constructed using 3x40 m spans. In Bánhida, a three-span bridge was built over the railway-line Budapest-Hegyeshalom in 1908. It was in 1914, relatively early when préfabrication was applied first: modernisation of the deck of Danube-bridge by Komárom using the design of dr. Szilárd Zielinski. 23 reinforced concrete bridges built before World War II are still in use in the county KomáromEsztergom. The bridges of relatively long spans on main roads became victims of war destruction. A concrete deck arch bridge was completed on the road Esztergom-Dobogókő in 1938. The bridges were often destructed during wars (1664, 1683, 1849). Mass destruction could be observed during the world wars, mainly the second one when not only the Danube-bridges but also short-span bridges (altogether 79 in the county) were blown up. First, they were reconstructed only temporarily, so, for example, the bridges over the railway in Tatabánya and in Komárom were reconstructed permanently just in 1962-63. The railway Danube-bridge was reconstructed in 1954 using a structure different from the preseding one (countinous and parallel-flanged structure erected by the cantilever method). The Danube-bridge by Esztergom is under construction presently. New reinforced concrete bridge construction techniques appeared after World War II, e.g. préfabrication and prestressing. In Szárliget, a Hoyer-type, prefabricated and prestressed girdes bridge of 13 m span was built in 1951. The border ripped plate bridge was a structure frequently applied. The most successful prefabricated element was the so-called inverted Tbeam used first in 1959. As widely-used structures in the county, it can be mentioned the frames, as well as the Gerber's hinged box structures for SmallDanube-bridges of 40 m span. As a unique project in Hungary, the Kecskéd arch bridge of 36 m span built in 1965 can be mentioned which has no upper cross braces. In the county, there are 203 bridges on national public roads, 549 on community (local) public roads and 90 on railway lines . The 38 bridges of motorway Ml should be also mentioned pointing out the continuous oblique reinforced concrete girder bridges and the early prefabricated structures. This book presenting the history of the bridges in the county - as a part of a publication series - wishes to help the interested researchers and readers using ample illustrations and giving the literature sources. The book - after the introduction of topography - outlines the development of county road network, presents the early bridge constructions, then describes the construction of timber, stone, brick, iron, steel and reinforced concrete bridges, the reconstruction of bridges after 1945, it summarizes the major information on national highway, local highway, motorway and railway bridges, it outlines the appearance of bridges in art, then presents the history of major bridges in detail. As an appendix, maps, design drawings, register-books and other documents are shown, then a selection of famous designers and contractors is introduced, finally the main events of the bridge construction in the county are presented in a chronological order. Several experts contributed to completing the book in gathering sources: Kálmán Beck, László Kertész, László Lachner, in writing various chapters: Enikő Kerényi, Zsuzsa TeveszAlbu, László Szabó, dr. Ernő Tóth. The earlier and present research works of dr. Imre Gál, the description of several bridges by Jenő Hargitai, as well as the assistance of archives and museums were of great help. Also designers, contractors, post card collectors and other persons have enriched the content of the book. The reader, dr. Herbert Träger has done a very careful job. 149