bridge bridge

Document Sample
bridge bridge Powered By Docstoc
					bridge
         category nominations
                         CATEGORY WINNER


           STEEL AWARDS 2010


  WINNER: BRIDGE
 7th AVENUE BRIDGE
       OVER THE N1
  The response of the team certainly

  did justice to the request resulting

             in a bridge that SANRAL and

          Johannesburg are surely proud
                                                        For the structural steel industry we regard it as a coup, when a functional
          to be associated with not only
                                                        concrete arch bridge spanning the N1 highway in the north-west corner of
 from its great looks but also as one                   Johannesburg needs to be replaced due to widening activities of the highway
                                                        and for height clearance purposes. All the more so if the replacement bridge is
              of the most used pedestrian               a combination of steel and concrete where the strengths of both materials are
                                                        used exactly as and where they should be used.
                                  bridges around.
                                                        In their brief to the professional team, the client, South African National
                                                        Roads Authority Limited (SANRAL) clearly requested that the opportunity be
                                                        used to create a special bridge that would be seen as a ‘gateway’ to
                                                        Johannesburg. The response of the team certainly did justice to the request
                                                        resulting in a bridge that SANRAL and Johannesburg are surely proud to be
                                                        associated with not only from its great looks but also as one of the most
                                                        used pedestrian bridges around. Scholars cross the busy highway to meet
                                                        their school busses on the other side.

                                                        It is designed as a cable stayed bridge but breaks from tradition in that the
                                                        bridge does not have a counterweight rear span.




114   Steel Construction Vol. 34 No. 5 September 2010
                                                                                   CATEGORY WINNER


                                                                                  STEEL AWARDS 2010

                                                                                  which transfers the forces in the cable stays both
                                                                                  axially and by bending moment into the footing.


                                                                                  The walkway and cable stay ends are tied to a
                                                                                  toblerone circular hollow section truss creating a
                                                                                  clear arched span over the freeway.


                                                                                  The absence of a counterweight span gave the
                                                                                  team an opportunity to do something very elegant.
                                                                                  But you still have to create a load path for all those
                                                                                  forces at the top ends of the cable.


                                                                                  The concrete tower leans back from the road,
                                                                                  creating an axial path down the concrete that
                                                                                  redirects all those sloping cable forces through the
                                                                                  concrete structure down to the ground.
When one thinks of typical cable stayed bridges one thinks of a long clear span
built using steel with a short counterweight span in concrete. One of the best
examples and closest in proximity is the Nelson Mandela Bridge - Steel Awards     Another plus that the concrete offers is the bulky
overall winner in 2003.                                                           mass it has and its ability to withstand the rogue
                                                                                  forces a vehicle out of control and smashing
In the case of the 7th Avenue bridge the traditional short span concrete coun-    into the concrete work would impart to the
terweight span is replaced with an outwards leaning concrete tower column         structure.




                                                                                        Steel Construction Vol. 34 No. 5 September 2010   115
                         CATEGORY WINNER


           STEEL AWARDS 2010

Dealing with the ends of the cables is one of the       each angle of intersection between the cable and the concrete tower is
intricate issues in designing, detailing and build-     different. As in all structures immaculate attention to detail is the name of
ing such a bridge. Each slope is different and          the game!


                                                        The use of a concrete (composite) walkway surface (deck) makes sure that
   project team                                         concrete loads are all compressive in their nature to suit the strengths of the
                                                        concrete. The steel carries the tensile forces where it is strong as well as some
      Developer/ Owner:                                 of the compressive forces.
      SANRAL

      Architect:
      Professor Glen Mills / SANRAL                     JUDGE’S COMMENT
      Structural engineer:                              A great example of the right material in the right place, something the SAISC
      SSI Engineers and Environmental                   strongly advocates.
      Consultants
                                                        Very important in the success of this bridge is the quality of the steelwork work-
      Main contractor:
                                                        manship and presentation. Well done guys!
      WBHO

      Steelwork contractor:                             This very elegant solution is a proud addition to the north western gateway to
      Omni Struct Nkosi (Pty) Ltd                       Johannesburg and the lighting at night makes it exceptional.
      Detailer:
      Omni Struct Nkosi (Pty) Ltd                       It is clearly an example of excellent use of steelwork truly deserving an award
                                                        in the bridge category.




bridges
           category nomination
Orange Farm Pedestrian Bridge                                                                                            SHORTLISTED

PROJECT TEAM
Developer/Owner:
SANRAL
Architect:
Boogertman & Partners Architects
Structural Engineer:
KV3 Engineers
Overall Project Consultants:
ITS Engineers (Pty) Ltd
Project Manager:
KV3 Engineers
Main Contractor:
iQNC Imagine Construction (Pty) Ltd
Steelwork Contractor:
Omni Struct Nkosi (Pty) Ltd




116   Steel Construction Vol. 34 No. 5 September 2010
                                         CATEGORY NOMINATIONS


                                         STEEL AWARDS 2010


bridges
         category nomination
Brooklyn Bridge                                                             SHORTLISTED

PROJECT TEAM
Developer/Owner:
Atterbury Property
Architect:
Barnes van der Walt Architects cc
Structural Engineer:
DG Consulting Engineers (Pty) Ltd
Quantity Surveyor:
Pentad Quality Surveyors (Pty) Ltd
Main Contractor:
Archstone Construction (Pty) Ltd
Steelwork Contractor:
Central Welding Works




bridges
         category nomination
Nsuze River Pedestrian Bridge                                               SHORTLISTED

PROJECT TEAM
Developer/Owner:
Department of Transport
Architect:
BNC Projects (Pty) Ltd
Structural Engineer, Quantity Surveyor
and Project Manager:
BJFC Consulting Engineers
Main Contractor:
BM JV
Steelwork Contractor:
BNC Projects (Pty) Ltd
Detailer:
SDN Drawing
Project Riggers:
Big Red Rigging




                                           Steel Construction Vol. 34 No. 5 September 2010   117
              CATEGORY NOMINATIONS


           STEEL AWARDS 2010


bridges
           category nomination
Port of Port Elizabeth New 54m Span Fire-Fighting Bridge

PROJECT TEAM
Developer/Owner:
Transnet National Ports Authority, Port Elizabeth
Structural Engineer:
Transnet Capital Projects
Project Manager:
RME Structures, Transnet Capital Projects
Steelwork Contractor:
RME Structures, Transnet Capital Projects
Detailer:
Ross McSweeney




bridges
           category nomination
Orlando Towers Bunjee Jumping Bridge

PROJECT TEAM
Developer/Owner:
Sky Riders (Pty) Ltd
Structural Engineer:
THS & Associates (Pty) Ltd
Project Manager:
Tass Engineering (Pty) Ltd
Steelwork Contractor:
Tass Engineering (Pty) Ltd




118   Steel Construction Vol. 34 No. 5 September 2010

				
DOCUMENT INFO
Shared By:
Categories:
Stats:
views:53
posted:2/16/2011
language:English
pages:6