Die Brücke Lockwitztal – eine Revision nach Entwurf und Ausführung

The Bridge Lockwitztal, a Review of Design and Execution. In the course of the newly built federal motorway A 17, the bridge Lockwitztal crosses a wide valley in a maximum height of 64 m, with a length of 723 m. At the bottom of the valley lies a suburb of Dresden and at the valley slopes exist nature areas which have to be conserved. With the executed design, an adequate solution for the demanding situation was found. The two main spans are each 125 m. In four of the spans are situated concrete arch struts, which together with the composite superstructure and the piers form an integral frame system. The bridge shows a new way of deploying the aesthetic value of arch systems in the crossing of valleys up to now thought as not suitable for this and with the innovative construction was developed a novel link between arch systems and strutted frame systems. In the paper are discussed the essential elements of the construction and of the building processes in review after execution.     

Die Stahlverbundbrücke über die Müglitz im Zuge der Autobahn Dresden–Prag – Entwurf und Ausführung

The composite bridge across the Müglitz on the highway Dresden–Prag. Design and construction. The bridge across the Müglitz transfers the newly built Federal Highway A17 over the small town Dohna near by Dresden. The bridge has a total length of 310 m and crosses a railway, a state highway and the river Müglitz. The bridge dominates the townscape. Extensive design investigations were performed to find the technically and aesthetically right solution for the given situation. Chosen and built was a continuous girder bridge as a composite structure with a span sequence of 45 – 55 – 55 – 55 – 55 – 45 m. The construction is composed of two bridges, one for each carriageway. Each superstructure has two airtight steel box girders, which are in composition with the concrete deck slab. To give the bridge a differentiated view, the main girders are built with shallow but significant haunches and emphasized stiffening boxes in the bearing zones. In the design of the composite columns these criteria reappear in the widening of the column heads and the eight‐cornered cross‐sections. Special consideration was given to a simple fabrication and an unproblematic erection with as far as possible reduced welding at the site. The article covers the planning and the building of the bridge. In addition experiences made in building other bridges with airtight box girders are reported.     

Entwurf der Talbrücke Rinsdorf

Design of the viaduct Rinsdorf. In the course of the renewal of the Highway A45 from Dortmund to Frankfurt many viaducts are designed as steel concrete composite bridges. Mainly composite box sections are used with wide cantilevering carriageway slabs and with additional longitudinal girders which are supported by outer diagonals. The Viaduct Rinsdorf is a typical example for this type of cross‐section. Because the outer diagonals and especially the joints are subjected to significant fatigue loading, for the bridge Rinsdorf extensive fatigue tests were performed in order to get scientifically verified results for the determination of the fatigue resistance of the joints. The paper deals with the design of the bridge Rinsdorf and especially with the testing program for the fatigue strength of the joints.     

Netzwerkbogenbrücken – Entwurf,Bemessung, Ausführung

Network arch bridge – design and execution. The construction of the network arch as a tied arch bridge with a framework stiffening is increasingly accepted in Germany. It combines the advantages of an arch with those of a framework. This enables the usages of very slender cross‐sections of arches and lower booms. In connection with the scarcely visible net of hangers a very transparent structure with less influence on the urban environment or landscape can be achieved. The network arch allows spans up to 300 m. In the following the principles of designing network arches are explained. Furthermore, the status quo of construction and calculating is described by examples of planned and already realized projects.     

Die Haseltalbrücke bei Suhl – Entwurf,Ausschreibung und Vergabe

The Haseltalbridge near Suhl – design, specifications and contract‐letting. The article illustrates the design phases of the new bridge over the Haseltal near Suhl which is part of the new interstate highway A 73. In fact of special boundary conditions in erection and future scenarios of rehabilitation the meanwhile common method of chosing a single steel trough as part of a composite section has to be modified.     

Geh‐ und Radwegüberführung mit ungewöhnlicher Lage bei Hornberg – Entwurf und Ausführung –

A foot and bike bridge in Hornberg – design and realizing. In a topical, difficult situation was realized from Regierungspräsidium Freiburg in Hornberg, black‐forest, over the river Gutach a foot and bike bridge also for disabled people. The unusually, symmetric solution of bridge consist of a curved, with on a struddled pylon exhausted steel connection construction. The formation, especially the curvature in the outline, is given from the existing, local situation. At the struddled pylon over the Gutach the shape of curvature is taken as an element of style. The following report the questions regarding draft origin, the problems of foundation, the construction and its static and also the manifacturing will be described.     

Die Wupper‐Talbrücke Oehde – eine moderne Verbundbrücke

The Wupper River valley bridge – a state‐of‐the‐art composite bridge. The German motorway Autobahn A 1 is one of the nation's most important and frequently traveled highways, connecting the country's northern and southern regions. The road currently has two lanes in each direction, which do not provide enough capacity to carry the traffic volume without daily traffic jams and heavy delays. Therefore, the federal government and the Northrhine‐Westfalia Department of Transportation decided to ease the situation by adding one lane in each direction. This total of 6 lanes fits into the master plan of widening major highways around the Ruhr River region. North of Cologne, the Autobahn A 1 crosses mountainous terrain, so several bridges with total lengths between 240 and 420 meters have had to be widened, replaced, or, most commonly, supplemented by a new bridge. Such supplementation was used on the Wupper River Valley Bridge, called Oehde, close to the city of Wuppertal. The bridge illustrates an example of modern composite bridges adopting new methods in construction and design, and also marks an outstanding example of current composite structures in Germany.     

Entwurf und Ausführungsplanung der Stöbnitztalbrücke

Auf der Neubaustrecke Erfurt – Leipzig/Halle werden zurzeit einige Talbrücken realisiert, die einen neuen, ganzheitlich orientierten Entwurfsansatz verfolgen. Bei diesen integralen bzw. semi‐integralen Bauwerken sind die Überbauten monolithisch mit den Pfeilern und teilweise mit den Widerlagern verbunden. Sie können deshalb schlanker und mit stetigen Übergängen zwischen den Bauteilen ausgeführt werden. Durch den weitgehenden Verzicht auf Lager und Fugen und durch die robuste Bauweise besitzen integrale Bauwerke eine wesentlich längere Lebenserwartung als herkömmliche Talbrücken. Die Scherkondetalbrücke und die Gänsebachtalbrücke wurden bereits in vorherigen Ausgaben beschrieben. In diesem Beitrag wird über den Bau der Stöbnitztalbrücke berichtet, die als Sondervorschlag der ausführenden Baufirma realisiert wird. The Bridge over Stoebnitz Valley – a Bridge without Bearings on High‐Speed Railway Route Erfurt – Leipzig/Halle Currently some large valley bridges are under construction on high‐speed railway route Erfurt‐Leipzig/Halle. These bridges follow a new holistic design philosophy. The superstructures of those integral or semi‐integral bridges are rigidly connected to the abutments and the columns. Therefore, they are more slender than conventional bridges and the bridges are very robust and durable because of the omitting of bearings and dilatation joints. The bridges over Scherkonde valley and over Gaensebach valley were already described in previous issues. In this paper the construction of the bridge crossing Stoebnitz valley is reported. This bridge is being built as an alternate design of the contractor.     

Die Haseltalbrücke bei Suhl – Ausführungsplanung,Fertigung und Montage

The Haseltalbridge near Suhl – final design, fabrication and erection. The article describes the execution of the new Haseltal bridge near Suhl/Germany through the phases of final design, fabrication and erection under consideration of the complex local requirements.