recent road construction experiences in the …...presented by: wandie olivier, pr. eng recent road...
TRANSCRIPT
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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
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Old Oak Bridge Demolition
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Old Oak Bridge Construction
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Introduction
ScopeDemolition:
- Reason behind demolition- AOT- Demolition weekend
Construction
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Scope of Works
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Scope
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Scope
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Reason behind the Old Oak Bridge
Demolition
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Layout
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Details
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Vertical clearance
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Vertical clearance
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Vertical clearance
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Vertical clearance
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Level difference
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Horizontal clearance
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Horizontal clearance
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Accommodation of Traffic
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AOT
12 – 14 May 2017
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Transport Management Center
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AOT
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AOT
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Bridge Demolition
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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
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
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Bridge Demolition
Target
58 hours
Achieved
22 hours
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Construction
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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
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Lateral Support
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Piling
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Piling
14 piles 16 piles 10 new piles16 existing piles
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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 -
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Piling
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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
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Piling
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Piling
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Piling
Fairbrother rig = 15 m
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Construction joint
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Pier
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Falsework
Horizontal & Vertical Clearance
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3 900 3 900900
10 880
Horizontal Clearance
900
710710 3 2003 2009 100
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Horizontal Clearance
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Vertical Clearance
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Vertical Clearance
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Vertical Clearance
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Deck Rebar
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Deck Rebar
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Construction Joint
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Post-tensioning
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Post-tensioning
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Post-tensioning
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Drip grooves
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Old Oak Bridge – 1993
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Thank You