Installation of Marquardt Bridge, Germany
ALE has installed the Marquardt Bridge, weighing 700t, in Marquardt, Germany.
Measuring 100m long, 15m wide and 18m high, the bridge was installed in several phases.
The arc bridge was built in front of the first abutment, with the first crossgirder supported on the abutment. The bridge was then jacked-up 0.5m with two 285t climbing jackets from the client supports on the first abutment. This created enough clearance for ALE to install the stationary skidding plates.
16 axle lines of SPMT in a configuration of 2 x 2 file 8 were then installed underneath the girders on the back of the bridge and all of the client’s supports were removed.
Two 500t stationary skidding plates were installed in front of the bridge to create the sliding points on land.
Two 70t strand jacks were installed at the rear of the bridge as propulsion for the bridge. The strand jacks were filled with three strands on each side to create enough capacity to exceed the friction between the bridge and the skidding plates.
The bridge was launched over skidding plates for 40m onto the first abutment until the maximal cantilever was reached.
The pontoon, consisting of four towers braced to each other and the pontoon, was then positioned underneath the bridge to take part of the weight. Skidding plates were installed on top of the towers.
The bridge was launched over the pontoon for 25m until the maximal cantilever was reached. During the positioning of the pontoon, the pontoon was fixed with strands to the abutment until the maximal cantilever was reached. This connection was then cut after fixation of the bridge to the pontoon and just before the float-over.
The float over operation of the bridge was then carried out with the pontoon, until the bridge was in the preferred position.
The bridge was then taken over by two 285t climbing jacks on the other side of the river on the second abutment, where the pontoon was then removed.
The stationary skidding system was then exchanged for the same two climbing jacks used in the first phase. The bridge was jacked down onto the bearing points and repositioned in detail to the final laydown position, as approved by the client. Here, the weight of the bridge was transferred onto the bearing points.