<translation>Zvedací lávka</translation>
In 2014, Mr. Bouška, an avid cyclist and the current deputy mayor, suggested that we develop designs for 5 different bridges and transshipment points in Mladá Boleslav. The footbridge over the Klenice River, which was favored by the city representatives, had to wait for funding for a longer time, but in the end, everything worked out, and today the footbridge is a reality.
This pedestrian and cyclist bridge is very special; in the event of rising water and imminent flooding, it rises from its concrete base and is subsequently manually lifted to a safe height. This unique feature required a rather unusual solution, and for this reason, we are grateful to the leadership of Mladá Boleslav for allowing us to participate in such a unique realization as designers.
Above the bridge, another structure is visibly present at first glance - a wooden frame in the shape of a pyramid, where four columns (pressure-impregnated pine) support additional secondary structures, onto which the footbridge can be lifted using a lever hoist system. To ensure that operating the bridge does not become an unprecedented feat of strength, the structure must be very light. Therefore, we chose a classic system known as the "Howe truss," very popular since the time when railways began to spread across the world. It is a truss with two types of construction; the first, crossed wooden elements transfer compressive forces, and the second, metal rods transfer tensile forces and connect both chord members of the truss. The metal rod wisely divides the roles of the wooden and metal components throughout the length of the beam. The footbridge itself is made of larch timber.
The walking surface of the deck is designed as a grid of cross-laid profiles 20x60mm supported by spacers. The lifespan of the wooden structure is significantly extended thanks to the protection of horizontal wooden elements against water and the zinc-titanium sheathing.
The footbridge connects newly built pedestrian and cyclist paths, and by crossing the Klenice River, the system is ideally integrated into the transportation network.
This pedestrian and cyclist bridge is very special; in the event of rising water and imminent flooding, it rises from its concrete base and is subsequently manually lifted to a safe height. This unique feature required a rather unusual solution, and for this reason, we are grateful to the leadership of Mladá Boleslav for allowing us to participate in such a unique realization as designers.
Above the bridge, another structure is visibly present at first glance - a wooden frame in the shape of a pyramid, where four columns (pressure-impregnated pine) support additional secondary structures, onto which the footbridge can be lifted using a lever hoist system. To ensure that operating the bridge does not become an unprecedented feat of strength, the structure must be very light. Therefore, we chose a classic system known as the "Howe truss," very popular since the time when railways began to spread across the world. It is a truss with two types of construction; the first, crossed wooden elements transfer compressive forces, and the second, metal rods transfer tensile forces and connect both chord members of the truss. The metal rod wisely divides the roles of the wooden and metal components throughout the length of the beam. The footbridge itself is made of larch timber.
The walking surface of the deck is designed as a grid of cross-laid profiles 20x60mm supported by spacers. The lifespan of the wooden structure is significantly extended thanks to the protection of horizontal wooden elements against water and the zinc-titanium sheathing.
The footbridge connects newly built pedestrian and cyclist paths, and by crossing the Klenice River, the system is ideally integrated into the transportation network.
Huť architektury Martin Rajniš
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