Picture courtesy of Liebherr
Meeting within the water: The primary crane used for the substitute of the Rader Top Bridge was once assembled at the new pile cap of the primary bridge pier.
The substitute of the Rader Top Bridge in Schleswig-Holstein is without doubt one of the biggest bridge modernization initiatives these days beneath method in Germany.
The bridge, constructed again in 1972, spans the Kiel Canal and is a part of the A7 dual carriageway. Measuring roughly 4,920 toes. in period, it’s Germany’s second-longest metal highway bridge and performs the most important function within the drift of visitors to and from Denmark and the Scandinavian peninsula.
The bridge is drawing near the tip of its helpful existence because of prime volumes of visitors, that means {that a} rebuild and simultaneous widening of lanes has turn into essential.
Picture courtesy of Liebherr
A Liebherr LR 1250 crawler crane, manufactured in Nenzing (Austria) made the meeting imaginable.
Cranes in Operation in Water, On Land
Robust make stronger for this main development undertaking is being supplied by way of 18 Liebherr cranes from the apartment fleet of Friedrich Niemann GmbH & Co. KG, founded in Kronshagen close to Kiel. 5 fast-erecting cranes, two 65 Okay.1s and 3 81 Okay.1s, are on website to lend a hand with the principles. The brand new bridge piers are being constructed with the assistance of six 125 EC-B and 7 150 EC-B flat-top cranes.
Prerequisites on website are answerable for some impressive crane assemblies. The primary crane to reach at the development website, a 125 EC-B, was once assembled on the finish of 2023. Meeting came about within the waters of Lake Borgstedt, the place the crane stood at the first pier’s pile cap secured by way of basis anchors. This concerned operating with a Liebherr crawler crane from Nenzing (Austria). The 275.5 ton LR 1250 crawler crane required for the meeting was once situated on a floating platform between the crane website and the ferry used for transporting portions. The flat-top crane reached a hook peak of 144 toes.
3 125 EC-B cranes additionally had been assembled the usage of the 275.5 ton crawler crane, from its floating platform at the water. The cranes had been to start with assembled at a peak of 98.4 toes. after which climbed to their ultimate hook peak of 164 toes. the usage of hydraulic mountain climbing apparatus. This allowed them to paintings some 49 toes. above the peak of the roadway.
A 150 EC-B 8 Litronic began off operating at the bridge pier on land. However the development of the website required the crane to be moved to a brand new location. On the finish of June 2024 it was once time: the flat-top crane was once moved from the north aspect of the bridge to the following bridge column and reassembled within the water.
The disassembled crane was once transported to its new location on a ferry and put again in combination once more with the assistance of a 242 ton crawler crane on a floating platform. As soon as assembled, it climbed to a hook peak of round 164 toes. and reached a jib period of 131 toes. The crane has the capability to raise as much as 8.8 heaps.
Picture courtesy of Liebherr
One of the crucial Okay cranes on website slew beneath the bridge and are due to this fact arrange with their towers retracted.
Liebherr Mission Division, Condo Fleet Make stronger Making plans, Implementation
Exact making plans was once required prematurely for using the cranes, and Liebherr’s personal undertaking division for massive and particular initiatives (Tower Crane Answers, TCS) supplied treasured make stronger. A significant problem lay within the cranes being assembled by way of the crawler crane at the floating platform.
Because the permissible hook peak of the crawler crane at the floating platform was once limited, the meeting peak needed to be stored as little as imaginable. Alternatively, a definite tower peak was once additionally essential in order that the cranes might be climbed. Quite a lot of choices and tower techniques had been due to this fact investigated within the run-up to the undertaking so as to to find the most efficient answer.
The configuration of the tower combos was once any other main factor previous to making plans crane operations; it was once very important to forestall the towers from colliding with the newly erected bridge piers and any possible tower deformations.
Because of this, the fast-erecting cranes are most effective partially using their most hook peak. The 2 65 Okay.1 cranes are in use with their tower retracted as they slew beneath the bridge, and the 3 81 Okay.1 cranes are also assigned to paintings beneath the bridge in addition to at most peak above it. The 13 flat-top cranes are assembled in a free-standing place on crosses and basis anchors; a few of them are set in concrete within the water. They’re operating with a hook peak of between 160.7 and 223 toes.
The hydraulic mountain climbing apparatus has been supplied by way of the Liebherr Tower Crane Middle, the Liebherr spouse for particular crane rent, crane elements and used machines direct from the producer.
Climate stipulations provide an additional problem all through development paintings. The Rader Top Bridge is closed to drain lorries and vehicles with trailers from wind pressure 9 onwards (storms with wind speeds of 46 to 55 mph). If the wind alternatives up additional, it may be closed to all cars over 8.2 heaps. Within the match of a storm (wind pressure 12), the bridge is closed utterly. The wind stipulations due to this fact needed to be taken under consideration within the cranes’ static calculations.
Picture courtesy of Liebherr
Onwards to the following bridge pier: The cranes transfer because the website progresses and are assembled in situ, as right here within the waters of Lake Borgstedt.
New Construct in Two Levels
The Rader Top Bridge is positioned east of town of Rensburg, roughly 18.6 mi. from Kiel and round 40 mi. from Flensburg. Visitors these days flows around the Kiel Canal, Rader Island and Borgstedter Enge (a part of Borgstedt Lake) on 4 lanes and two exhausting shoulders. The bridge’s piers stand each on land and within the water. 3 piers are being erected within the water and require a basis of 131 toes.-deep bored piles.
The brand new construct is occurring in two levels with visitors flowing alongside the present bridge in addition to the Kiel Canal, the sector’s busiest man-made waterway. The japanese part of the bridge is being constructed first, subsequent to the present bridge, and is anticipated to be opened to visitors in 2026. Following this, the unique bridge will shut and be demolished, with the western bridge phase being constructed as an alternative. The brand new construction is being widened to 6 lanes and must be completed in 2031.
The bridge piers for the japanese substitute construction are being erected first. Metal portions for the substructure arrive as 13 toes. lengthy elements and are welded in combination on land to create components as much as 262 toes. in period. Those are then driven alongside against the following pier the usage of the incremental launching way, with one increment being one bridge phase. To do that, the piers must be erected smartly prematurely of the launching procedure.
Paintings has began north of the bridge and is progressing southwards against Lake Borgstedt and throughout Rader Island within the route of the Kiel Canal. There additionally is figure beneath approach to the south of the bridge, at the banks of the canal. The development undertaking is being performed by way of a consortium headed by way of the Swiss development corporate Implenia AG at the side of two Saxony-based corporations Plauen Stahl Technologie GmbH and ZSB Zwickauer Sonderstahlbau GmbH.
Picture courtesy of Liebherr
A crawler crane on a floating platform is used for meeting. The disassembled crane is transported to its new location by way of ferry.
Section Reaches First Pier
On June 28, the primary bridge phase reached the primary pier. This actual phase is 183 toes. lengthy, 46 toes. vast and 19.7 toes. prime. Hydraulic presses moved the phase, which weighs a number of heaps, at a pace of 29.5 to 32.8 toes. in step with hour southwards against the primary pier. The substitute construction will encompass a complete of 14 sections, with one development deliberate for each and every six to seven weeks.
Picture courtesy of Liebherr
The substitute construction for the japanese part of the bridge is being constructed subsequent to the present bridge and is scheduled for of entirety in 2026.
This tale additionally seems on Crane Apparatus Information.
