In situ deck construction
Incremental launching
The principle is to progressively build the bridge deck behind one of the abutments.
Segments of comparable length are concreted in a formwork or assembled in an assembly area. Then, each segment is match-cast against the previous one and prestressed to the section of the deck already built. As segments are added and slided over special bearings, the increasing length of bridge deck is repeatedly pushed / pulled out of the formwork or assembly area, over the abutment onto the piers, to reach its final position. Provision of a launching nose stressed against the first deck segment will reduce the big bending moments in the deck during launching.
Segments of comparable length are concreted in a formwork or assembled in an assembly area. Then, each segment is match-cast against the previous one and prestressed to the section of the deck already built. As segments are added and slided over special bearings, the increasing length of bridge deck is repeatedly pushed / pulled out of the formwork or assembly area, over the abutment onto the piers, to reach its final position. Provision of a launching nose stressed against the first deck segment will reduce the big bending moments in the deck during launching.
-
Erection rate
one segment every 7 or 8 days -
Quality of segment fabrication
with a sheltered casting yard -
Limited investment in special equipment
(launching nose, jacking system,
launch bearings, side guides)
Incremental launching
The principle is to progressively build the bridge deck behind one of the abutments.
Segments of comparable length are concreted in a formwork or assembled in an assembly area. Then, each segment is match-cast against the previous one and prestressed to the section of the deck already built. As segments are added and slided over special bearings, the increasing length of bridge deck is repeatedly pushed / pulled out of the formwork or assembly area, over the abutment onto the piers, to reach its final position. Provision of a launching nose stressed against the first deck segment will reduce the big bending moments in the deck during launching.
Segments of comparable length are concreted in a formwork or assembled in an assembly area. Then, each segment is match-cast against the previous one and prestressed to the section of the deck already built. As segments are added and slided over special bearings, the increasing length of bridge deck is repeatedly pushed / pulled out of the formwork or assembly area, over the abutment onto the piers, to reach its final position. Provision of a launching nose stressed against the first deck segment will reduce the big bending moments in the deck during launching.
-
Erection rate
one segment every 7 or 8 days -
Quality of segment fabrication
with a sheltered casting yard -
Limited investment in special equipment
(launching nose, jacking system,
launch bearings, side guides)
Incremental launching specifications
Incremental launching sketch
Cast-in-place cantilever with form travellers
The method consists in building the deck by successive segments, in symmetry on both sides of the pier, by making the built part support the weight of the next segment and of the mobile casting equipment. The deck construction does not have to be linear; it can be sequenced to follow pier construction.
This method is ideally suited: to cross high gaps and avoid ground constraints for bridges whose length does not require prefabrication, or with different cross sections or casting lengths
This method is ideally suited: to cross high gaps and avoid ground constraints for bridges whose length does not require prefabrication, or with different cross sections or casting lengths
-
High erection rate
one pair of segments every 3 to 7 days -
Long-span bridges
with access constraints -
Limited investment
Cast-in-place cantilever with form travellers
The method consists in building the deck by successive segments, in symmetry on both sides of the pier, by making the built part support the weight of the next segment and of the mobile casting equipment. The deck construction does not have to be linear; it can be sequenced to follow pier construction.
This method is ideally suited: to cross high gaps and avoid ground constraints for bridges whose length does not require prefabrication, or with different cross sections or casting lengths
This method is ideally suited: to cross high gaps and avoid ground constraints for bridges whose length does not require prefabrication, or with different cross sections or casting lengths
-
High erection rate
one pair of segments every 3 to 7 days -
Long-span bridges
with access constraints -
Limited investment
Our references in deck construction
Build
Turkey
Important savings in raw material and optimized execution planning were some of the many advantages of the alternative solution proposed by Freyssinet to build the Ihsaniye viaduct.
Liakhvi viaduct, Georgia / Incremental launching
Oum Rbia, Morocco / Cast-in-place cantilever
Canakkale Viaduct06, Turkey / Incremental lauching
Kaoshing viaduct, Taiwan / Cast-in-place cantilever
Majura road, Australia / Incremental launching
Sehzadeler viaduct, Turkey / Cast-in-place cantilever
Sheahan bridge, Australia / Cast in place cantilever
Assouan Bridge, Egypt / Cast-in-place cantilever
Bai Chai bridge, Vietnam / Cast-in-place cantilever
Chiapas steel bridge, Mexico / Incremental launching
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