CABLE ROOFS

CABLE ROOFS
Stéphane JOYE
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
Content
•
1. Cable roofs structures
•
2 C
2.
Cable
bl technologies
t h l i
•
3. Clamps
•
4 Anchorages
4.
•
5. Methods
•
Minsk Arena,
Arena Biellorussia (2008)
•
New Delhi Stadium, India (2010)
•
BC Place Stadium, Canada (2011)
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
2
1. Cable roof Structures
Stadium roofs
Minsk Arena
New Delhi Stadium
BC Place Stadium
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
3
1. Cable roof Structures
Minsk Arena
7 strand cable
Central node
27 strand cable
Struts (steel tubes)
120 m
Crossingg cables
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
4
1. Cable roof Structures
Compression ring
Roof
Stabilizing cable (13st)
P
T
New Delhi Stadium
Mast
Supporting cable
(25st)
Compression Ring
Collars
T
130 m
New Delhi
STadium
d
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
5
1. Cable roof Structures
Mast
Back stays
(2 72T15)
(2x72T15)
Roof
Upper Suspension
cable (2xØ90)
BC Place Stadium
Central Node
T i ring
Tension
i (10xØ125)
(10 Ø125)
Hangers (Ø18 to
Ø36)
L
Lower
Stabilizing
St bili i cables
bl
(2xØ70)
Compression ring
beam
260m
BC Place Stadium
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
6
1. Cable roof Structures
•
El
Elements
t :
•
Roof
•
Supporting suspension cable
•
Hangers / compression masts
•
Stabilizing cables
•
Compression ring
•
(tension Rings)
Characteristics
•
Avantages:
•
•
•
Very large span without supports
Light structure
Aesthetics
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
7
2. Cable technologies
•
Prefabricated Cables
Spiral strand or Locked Cables
•
Compactness
•
Clamp “ability”
•
Installation drawbacks
• heavy cable
• large anchorage (big jacks)
•
Poor durability
• rust in the cable
Spiral strand cables
• high maintenance cost (paint)
• low fatigue resistance (100 MPa)
Z shaped wire
Locked coil cables
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
8
2. Cable technologies
Multi strand cables : Cohestrand®
Durability requirement & Similarity with suspended bridges lead Freyssinet to propose a
Cohestrand solution :
•
7 high grade steel wires
•
Hot dip galvanisation
•
Resin filling around and withhin strand
ensuring full bond of sheath on strand (7MPa)
•
Full-bonded HDPE coating (patented)
•
•
•
Avantages:
Sliding forces are transmitted from the HPED duct to the
strand steel through the resin
High fatigue performance
Corrosion protection :
•
•
•
Double layer corrosion protection
Continuity of the protection all along the cables
Strand by strand installation
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
9
3. Clamps
Collars
Cast iron frame
Cohestrand
Mast
PA shims
F

Cohestrand
F┴
Cohestrand
FMAST
triangles inserts
Continuity of the corrosion
protection through the collar
Plastic / Plastic tightening
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
10
3. Clamps
Deviation « saddle »
•Target
Target :
Accomodates angle variations of the cables while
limiting the flexural stresses
•Principle of “saddle clamps” :
Impose a acceptable radius of curvature of the
cables
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
11
4. Anchorages
•
Classic
Classic anchorages (bloc and bearing plate) :
In compression ring
In central node
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
12
4. Anchorages
•
Fork
Fork anchorages :
O central
On
t l node
d
In compression ring
In tension ring cables
On masts
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
13
5. Methods
•
Ph 1 : Prefabrication
Cable prefabrication bench
Strand marking
Prefabrication bench
Storage
Marking
g and unsheathing
g
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
14
5. Methods
Ph.2 : Clamp Connections
Clamp connection with precurved cable
Clamp
p installation
Strand bundle compaction
Stade de Minsk
Pre tightening
Pre-tightening
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
15
5. Methods
Cable launchin with mast installation
Ph.3 : Launching
Cable net launching
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
16
5. Methods
Ph.3 : Launching
Initial ref
ref. strand launching and adjustment (sag)
Strand launching
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
17
5. Methods
Ph.3 : Lifting
Lifti off prefabricated
Lifting
f b i t d cable
bl nett
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
18
5. Methods
Ph.4 : Separation and mast installation
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
19
5. Methods
•
Ph.5 :Stressing
Fabrication at length
> (Adjustment
(Adj t
t att sag if possible)
ibl )
> (Pre-load : Central node release)
> Application of roof load
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
20
Thank You
1st SOLETANCHE BACHY & FREYSSINET MEETING - PARIS - 10 JUNE 2010
21