Method for transforming a cable supported bridge from a first bridge state into a second bridge state and cable supported bridge

Abstract

The invention relates to a method for transforming a cable supported bridge from a first bridge state in which at least one of said stay cables extends according to a first catenary to a second bridge state in which said at least one stay cable or at least one new stay cable replacing said at least one stay cable extends according to a second catenary, comprising at least one of the steps ofa) providing at a predetermined position of said bridge deck a further anchorage for an end of said at least one stay cable previously received and held by said bridge deck side anchorage or for an end of at least one new stay cable, andb) displacing an anchor unit of said bridge deck side anchorage or said further anchorage relative to an allocated fastening unit of said bridge deck side anchorage or said further anchorage to said predetermined position,said predetermined position being located closer to or further away from a support structure od said cable supported bridge than said bridge deck side anchorage or said anchor unit of said bridge deck side anchorage or said further anchorage, respectively, and being determined such that a tangent to the second catenary of said at least one stay cable or said at least one new stay cable at an entrance to said anchor unit of a support structure side anchorage is substantially parallel to an axis of a recess pipe of said anchor unit of said support structure side anchorage.

1 . A method for transforming a cable supported bridge comprising a bridge deck, a support structure and a plurality of stay cables extending between a bridge deck side anchorage located at said bridge deck and a support structure side anchorage located at said support structure, from a first bridge state in which at least one of said stay cables extends according to a first catenary into a second bridge state in which said at least one stay cable or at least one new stay cable replacing said at least one stay cable extends according to a second catenary, said bridge deck side anchorage and said support structure side anchorage each having an anchor unit for receiving and holding an allocated end of said at least one stay cable, and a fastening unit for fastening said anchor unit to said bridge deck and said support structure, respectively, and said method comprising at least one of the steps of
 a) providing at a predetermined position of a first building part, namely said bridge deck or said support structure, a further anchorage for receiving and holding an end of said at least one stay cable previously received and held by a first anchorage, namely said bridge deck side anchorage or said support structure side anchorage, and or an end of said at least one new stay cable, and   b) displacing said anchor unit of said first anchorage or said further anchorage relative to the allocated fastening unit of said first anchorage or said further anchorage to said predetermined position,   
       said predetermined position being located closer to or further away from a respective other building part, namely said support structure or said bridge deck, than said first anchorage or said anchor unit of said first anchorage or said further anchorage, respectively, and being determined such that a tangent to the second catenary of said at least one stay cable or said at least one new stay cable at an entrance to said anchor unit of a second anchorage, namely said support structure side anchorage or said bridge deck side anchorage, located at said respective other building part is substantially parallel to an axis of a recess pipe of said anchor unit of said second anchorage. 
     
     
         2 . The method according to  claim 1 ,
 wherein said anchor unit of said first anchorage is pivotably mounted to said allocated fastening unit.   
     
     
         3 . The method according to  claim 2 ,
 wherein a pivoting axis of said anchor unit is displaceable relative to said predetermined position.   
     
     
         4 . The method according to  claim 2 ,
 wherein an element receiving said pivoting axis is displaceable relative to said allocated fastening unit.   
     
     
         5 . The method according to  claim 2 ,
 wherein the anchor unit is designed as a clevis anchor unit.   
     
     
         6 . The method according to  claim 1 ,
 wherein said fastening unit comprises a plurality of holes having different distances from the respective other building part.   
     
     
         7 . The method according to  claim 1 ,
 wherein said fastening unit comprises at least one elongated hole extending at least partially towards the respective other building part.   
     
     
         8 . The method according to  claim 1 ,
 wherein said fastening unit comprises two separate substantially U-shaped fastening sub-units.   
     
     
         9 . The method according to  claim 1 ,
 wherein at least one strand of said stay cable is designed as an epoxy coated strand.   
     
     
         10 . A cable supported bridge, comprising
 a bridge deck,   a support structure, and   at least one stay cable extending between a bridge deck side anchorage located at said bridge deck and a support structure side anchorage located at said support structure   said bridge deck side anchorage and said support structure side anchorage each having an anchor unit for receiving and holding a respective free end of said stay cable, and a fastening unit for fastening said anchor unit to said bridge deck and said support structure, respectively,   said anchor unit and said fastening unit of a first anchorage of said bridge deck side anchorage and said support structure side anchorage allocated to a first building part, namely said bridge deck or said support structure, being adapted and configured to allow displacement of said anchor unit relative to said fastening unit to a predetermined position,   said predetermined position being located closer to or further away from a respective other building part, namely said support structure or said bridge deck, than a previous position of said anchor unit of said first anchorage, and being predetermined such that a tangent to the catenary of said stay cable at an entrance to said anchor unit of a second anchorage of said bridge side anchorage and said support structure side anchorage located at said respective other building part is substantially parallel to a recess pipe of said anchor unit of said second anchorage.   
     
     
         11 . The cable supported bridge of  claim 10 ,
 wherein said anchor unit of said first anchorage is pivotably mounted to said allocated fastening unit.   
     
     
         12 . The cable supported bridge of  claim 11 ,
 wherein a pivoting axis of said anchor unit is displaceable relative to said predetermined position.   
     
     
         13 . The cable supported bridge of  claim 11 ,
 wherein an element receiving said pivoting axis is displaceable relative to said allocated fastening unit.   
     
     
         14 . The cable supported bridge of  claim 11 ,
 wherein the anchor unit is designed as a clevis anchor unit.   
     
     
         15 . The cable supported bridge of  claim 10 ,
 wherein said fastening unit comprises a plurality of holes having different distances from the respective other building part.   
     
     
         16 . The cable supported bridge of  claim 10 ,
 wherein said fastening unit comprises at least one elongated hole extending at least partially towards the respective other building part.   
     
     
         17 . The cable supported bridge of  claim 10 ,
 wherein said fastening unit comprises two separate substantially U-shaped fastening sub-units.   
     
     
         18 . The cable supported bridge of  claim 10 ,
 wherein at least one strand of said stay cable is designed as an epoxy coated strand.