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The unexpected revolution in the underbridge access
1. the unexpected revolution in underbridge access:
totally new method
for going Down & Under
SAIA Annual Convention, Montreal, 23-26 July 2017 1/18(author: Anna Meldner)
innovative, mobile, edge mounted, stabilized underbridge access platforms
2. What is currently available for inspection, maintenance and work to the
underside of bridges/structures:
(in a specific situation - lack of access from beneath)
2/18SAIA Annual Convention, Montreal, 23-26 July 2017
3. WORKING PHASE:
• Suspended counterweight moved off the bridge direction.
• Gravity induced pushing force transferred via bumpers.
Innovative Underbridge Access Platforms
(what is the point? – we will share it with you)
3/18
B
A
B
Bumpers
MOVING PHASE; FREE HANGING PLATFORM:
• Suspended counterweight moved towards the bridge.
• The bumpers do not touch the bridge.
A
Counterweight
The centre of gravity of the
whole suspended platform is
moved away from equilibrium
position to induce “pendulum
effect”
Centre of gravity od the whole
platform falls exactly under the
suspension point
(equilibrium position)
Nobody did it
THIS
way!
new practice and UNCHALLENGED SAFETY standard
SAIA Annual Convention, Montreal, 23-26 July 2017
4. If the ‘Safe working load’ is
exceeded the ‘fail safe’
position of the platform is to
hang freely from the structure.
It will not tip over and fall.
NO TIPPING OVER!
WORK COMFORT & NO RESTRICTIONS TO TRAFFIC:
• The platform is totally stable and safe
• Normal traffic on the bridge or other works in the same time
Innovative Stabilization Method of Rigid Suspended Platforms
New safety standard for work to the bridge underside!
4/18
D
C
D SAFETY
• It does not fall –even in extreme conditions or overloaded!
C
SAIA Annual Convention, Montreal, 23-26 July 2017
5. MINIMAL STRIP OF DECK NEEDED FOR MOUNTING:
• The mounting rail close to the deck edge.
Innovative Mobile Edge-Mounted Underbridge Access Platforms
( they are like a mounting trolleys – but without the trolley+ballast on the deck)
5/18
E
G INSTALLATION & WORK WITH NO ACCESS FROM BENEATH
E
Mounting
trolley with
ballast
No interference in
the bridge
structure F
NO INTERFERENCE IN THE BRIDGE STRUCTURE:
• The bumpers only touch the bridge underside
F
G
H LOW COST
SAIA Annual Convention, Montreal, 23-26 July 2017
7. 7/18
Scheme of
work
DANGER:
Scheme of
work
DANGER:
none
SAIA Annual Convention, Montreal, 23-26 July 2017
Different types of access for maintenance and work under the bridge
deck:
(specific for the lack of access from beneath)
SCHEME OF WORK – SAFETY ISSUES – MAIN DANGER
8. Different types of access for maintenance and work under the bridge
deck:
(specific for the lack of access from beneath)
Comparison: cost / self weight (C.W.) / work load (Q)
$$$ $$$ $$$ $$$ $$ $$$ $$$ $$$ $
C.W.
Q
32.00 T
0.30 T
32.00 T
0.30 T
25.00 T
0.20 T
6.00 T
0.10 T
6.00 T
0.10 T
6.00 T
0.25 T
8/18
$$$ $$$ $$$ $$$ $$$ $$$ $ $
C.W.
Q
8.00 T
0.15 T
4.00 T
0.10 T
3.00 T
3.00 T
3.00 T
3.00 T
3.00 T
3.00 T
0.50 T
0.10 T
SAIA Annual Convention, Montreal, 23-26 July 2017
9. Innovative Method of Stabilizing the Suspended Underbridge Platforms
This method could be applied to the most of the existing types of plants
9/18
Mobile Free Hanging Stabilized by movable suspended counterweight
SAIA Annual Convention, Montreal, 23-26 July 2017
11. 11/18
A
B
A
B
STABILIZED WORKING POSITION:
• Suspended counterweight displaced to push the platform against
the bridge.
• Gravity pushing force induced by moving the center of gravity off
the equilibrium position.
• The bumpers transfer the pushing force onto the bridge structure.
Suspended movable counterweight
Bumpers
MOVEMENT PHASE, FREE HANGING PLATFORM:
• Suspended counterweight is placed in the position to swing
the platform away from the bridge structure.
• The bumpers do not touch the bridge.
SAIA Annual Convention, Montreal, 23-26 July 2017
Innovative, suspended, mobile, edge-mounted underbridge access platform
SSS – EAP2
this mode of work could be applied to other rigid suspended structures
12. Can we use such platforms when doing other phases of refurb or
concrete work?
12/18SAIA Annual Convention, Montreal, 23-26 July 2017
13. Can we... ?
Yes, we can.
13/18
steel „stools” –to be moved
alongside the rail segments
Platform’s trolley
Segments of the movement
rail are raised above the
reinforcement bars
As you see, there is a possibility of placing the platform movement rail above the reinforcement – if needed
SAIA Annual Convention, Montreal, 23-26 July 2017
14. Small and simple, movable platform for bridge edge access
SSS – EAP1
(maintenance, repair, inspection, construction)
14/18SAIA Annual Convention, Montreal, 23-26 July 2017
Mobile Free Hanging Stabilized by movable suspended counterweight
15. Mobile, deck-edge mounted, movable, high load platform
SSS – TR3
this big platform-transporter is able to deliver 2 tons of load (pot bearing) directly
under bridge from the deck
15/18SAIA Annual Convention, Montreal, 23-26 July 2017
Mobile Free Hanging Stabilized by movable suspended counterweight
16. Innovative, Mobile, Edge-Mounted, Underside Access Platform with
counterweight stabilization
SSS –UAP2 (underside access platform)
The swinging support arms allow the whole platform to pass the pillars without disassembling
16/18SAIA Annual Convention, Montreal, 23-26 July 2017
Mobile Free Hanging Stabilized by movable suspended counterweight
17. The happy construction works coordinator using SSS-platform.
Would YOU share YOUR views and opinions with us?
17/18SAIA Annual Convention, Montreal, 23-26 July 2017
