Integral Rail Bridge Construction
Transcript of Integral Rail Bridge Construction
Integral Rail Bridge ConstructionStamford Underbridge,Werrington Grade Separation
Rupert Noronha
Section Engineer
Morgan Sindall
Outline
• Werrington Grade Separation – Project Overview
• Integral Bridges – What are they? What are the benefits?
• Stamford Underbridge – Interface with WGS and Staging
Bridge Innovations on Stamford Underbridge
1. Original vs New Construction Sequence
2. Detailing Issues with Integral Bridges
Integral Bridges
• Monolithic superstructure and substructure creating a full moment connection
• No expansion joints or bearings
• Thermal movement and braking loads accommodated by abutment
• Different to Semi Integral – bearings but no expansion joints
• Reduced initial cost
• Better rideability – no joints
• Lower maintenance – no joints or bearings
• Lower whole of life cost
What are they?
What are the benefits?
Simply Supported
Spans typically less than
70m in length and less
than 30 degree skew
Integral Bridge
GNGE Line
East Coast Main Line
Diverted Brook
Access Road
Slewed Stamford
Lines
160m curved jacked box
Commercial
NewSouth Ramp
Stamford Underbridge
• When working next to rail infrastructure the best risk control is by preventing trains from running on a line (ie. blocking the line)
• Where not practicable (eg. the work requires consistent work during a shift) working with lines open to traffic is permissible under adjacent line open (ALO) conditions
Adjacent Line Open (ALO) Working
Stamford Underbridge
South Ramp
N
Non ALO Working
“Plant which cannot foreseeably reach the fouling point of a line at
maximum reach (including load) including human error requires a risk
assessment and a method to ensure the distance does not reduce”
Nearest Running Rail
Foul Point
• What am I lifting and how heavy is it?
• What platform will be required to support the
crane?
• Where are the support points on the beams?
• What is the closest location I can lift the beams
in from – smaller crane saves $$
• Are any temporary closures required?
• Where will the beam supply vehicle be located?
• How are fall and foul risks controlled in relation
to rail lines, power lines etc?
Planning a Lift
Detailing Issues
Stitch pour reinforcement between deck units bars
clashed with adjoining deck unit. These needed to
bent on site to land the beams.
Stitch
Pour
Rebar
East Coast Main Line
Great Northern Great Eastern Line
Slewed Stamford
Lines
South Ramp
Curved Jacked
Box
Stamford Underbridge