16_presentation - nvf annual bridge confererence 2014

8/18/2019 16_Presentation - NVF Annual Bridge Confererence 2014

1/47

3 SEPTEMBER 2014COWI POWERPOINT PRESENTATION1

NVF Annual Bridge Conference 2014

Unique bridges in Qatar

Jesber Rasmussen, Chief Project Manager, COWI A/S

Agenda:• Client's Expectations• COWI's design• Contractors

construction sequence• Photos from the

construction


2/47

3 AEPTEMBER 2014COWI POWERPOINT PRESENTATION2

Client's expectations

› New township in Doha in Qatar to200.000 residents

› Marinas

› Business center

› Entertainment

› Beaches

› Hotels

› 5 billion dollar projects

› 9 marine bridges

› Two of the bridges needed to be veryunique

Project description


3/47


Client's expectations

› Cable Stayed landmark› Arch bridge landmark

› Suspension bridge landmark

Client chose the suspension bridge

Because:

› First of its kind in the world

› A true landmark for Lusail

› Circle could resemble the Q in Qutar

› Circle represent the sun as thesource of life

Concepts developed together with

Dissing+Weitling


4/47


Design concept

› Form and functionality unique› Fantasy concept

› Like art

› Lighting and illustration to becomelandmark for Lusail in Qatar

= The challenge was set


5/47


6/47


Design

› Composite bridge deck with closed steel box › Steel box and main cable corrosionprotected by dehumidification system

Self anchored suspension bridges


7/47


Design

›

Mono cable › Cable anchored at ring and at bridgeends and down to the anchor block

› Like a two tower suspension bridge withdouble length

Main cable


8/47


Design

›

Main cable 7 locked coil strands Ø140,13900mm^2, min 18,7MN

› Main cable Ø424 dehumidification system

Cable system


9/47


Design

›

Bridge self anchored partly› Main span fully anchored for main span

› Side span anchored at bridge deck andat the anchor block

Anchor of Main cable at bridge ends

Adu


10/47


Design

›

Cables are anchored at pylon ring.› Anchor saddle would be long is notanchored individual

Anchor of Main cable at pylon


11/47


Design

›

Hangers pre-fabricated locked coilstrands Ø70, 3390mm^2 and min.strength of 4.8MN

› Hangers protected by HDPE pipe

Hangers


12/47


Design

›

Cable clamps design very compact andunique visual from the road.

Cable clamps


13/47


Design

›

Composite bridge deck with 250mmconcrete deck for weight and stiffness forcable system

› Max deformation 1/400*span

› Single cable plan require torsion stiffness= closed box girder

› Pre-fab + insitu deck

Bridge deck


14/47


Design

›

Two precast elements used› Between the pylon legs insitu

concrete steel plate under forstrengthening

› At bridge end in situ concretebecause of joints and steel plateunder the deck for strengthening

Bridge deck

side spanabutment

Pylon leg

insitupre-fab

pre-fab


15/47


Design

› Box girder closed

› small cross girders per 6m max height 2,74m and width 1.0m

Steel girder


16/47


Design

›

Utilities running in the girders› hence relative large opening

Steel girder


17/47


Design

›

Cross girder per 6m for the hangers› No cross girders between the pylon legs

Cross girder

no cross girders


18/47


Design

› Hammerhead in concrete

› Connecting bridge deck with pylon legs

and with the pylon ring

Connection bridge deck and pylon


19/47


Design

› Pylon ring 50m dia.

› Pylon in high strength steelabove bridge deck and prestressing high strengthconcrete below bridge deck

› Foundation on bored piles

Pylon ring


20/47


Design

› Pylon steel strengthened with stiffeners

Pylon ring


21/47


Design

› 6+8 cables between the pylon steel ringand pylon pier

Concrete part of pylon ring


22/47


Design

› Post-tensioned anchor block

› 5 strands from main anchored in anchor block 2 strands anchored in thesuperstructure girder

› 7 strands anchored in the superstructure at the abutment

Anchor block and abutment


23/47


Design

› All closed steel areas willcorrosion protected by

dehumidification› One system for bridge

girder, pylon and maincable

Dehumidification system


24/47


Construction sequence

1. Widen earthbridge/excavation

2. Piling and pile capconstruction

3. Substructure construction

4. Backfill and gantry craneinstallation

5. Bent system-side spanconstruction

6. Pylon & main span erection

7. CIP deck cast

8. Cable Erection

Construction


25/47


Photos


26/47


Photos


27/47


Photos


28/47


Photos


29/47


Photos


30/47


Photos


31/47


Photos


32/47


Photos


33/47


Photos


34/47


Photos


35/47


Photos

Ph


36/47


Photos

Ph t


37/47


Photos

Photos


38/47


Photos

Photos


39/47


Photos


40/47

Photos


41/47


Photos

Photos


42/47


Photos

Photos


43/47


otos

Photos


44/47


Photos


45/47


Completed bridge


46/47

30 AUGUST 2014COWI POWERPOINT PRESENTATION46


47/47


Thank you

16_presentation - nvf annual bridge confererence 2014

Documents