recent road construction experiences in the …...presented by: wandie olivier, pr. eng recent road...
TRANSCRIPT
Presented by:
Wandie Olivier, Pr. Eng
Recent Road Construction Experiences in the Western Cape and South Africa
SARF AGM/Seminar 10 October 2019
Project: Contract C1046Old Oak Bridge Demolition and Reconstruction for
N1 Widening
Old Oak Bridge Demolition
Old Oak Bridge Construction
Introduction
ScopeDemolition:
- Reason behind demolition- AOT- Demolition weekend
Construction
Scope of Works
Scope
Scope
Reason behind the Old Oak Bridge
Demolition
Layout
Details
Vertical clearance
Vertical clearance
Vertical clearance
Vertical clearance
Level difference
Horizontal clearance
Horizontal clearance
Accommodation of Traffic
AOT
12 – 14 May 2017
Transport Management Center
AOT
AOT
Bridge Demolition
Demolition Sequencing
1. Remove asphalt from bridge deck prior to demolition weekend
2. Place sand protection layer over both carriageways
3. Remove concrete slab of bridge deck4. Demolish longitudinal and transverse beams5. Remove rubble to stockpile6. Demolish bridge abutments, wing walls and piers7. Remove rubble to stockpile8. Remove protection layer from both carriageways
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Bridge Demolition
Target
58 hours
Achieved
22 hours
Construction
Details
❖ Cast in-situ, 3-spine prestressed concrete continuous deck❖ 91.5 m long❖ 20.4 – 24.85 – 24.85 – 20.4❖ Deck depth – 1.4 m ❖ Pier – 3 columns of hexagonal shape (integral with deck)❖ Perched abutments with ear wings (pot bearings)❖ All piled foundations – 610 mm DCIS (15 m long)❖ 11° skew
Lateral Support
Piling
Piling
14 piles 16 piles 10 new piles16 existing piles
Piling
Pile number
Depth according to PIT test
[m]
Depth established
through coring[m]
1 2.66 1.85
2 2.96 -
3 3.04 -
4 1.80 1.4
5 3.55 -
6 3.05 -
7 2.82 -
8 4.32 -
Piling
Piling
Size of rig caused some design issues:
❖ Pile 14 and 69 installed out of position (950 mm)❖ Pile 2 and 14: rake direction changed
Piling
Piling
Piling
Fairbrother rig = 15 m
Construction joint
Pier
Falsework
Horizontal & Vertical Clearance
3 900 3 900900
10 880
Horizontal Clearance
900
710710 3 2003 2009 100
Horizontal Clearance
Vertical Clearance
Vertical Clearance
Vertical Clearance
Deck Rebar
Deck Rebar
Construction Joint
Post-tensioning
Post-tensioning
Post-tensioning
Drip grooves
Old Oak Bridge – 1993
Thank You