Abstract
The extension of the 3rd lane on Trunk Road 9 Section 1 (N1) at Bellville in the Western Cape necessitated the demolition and replacement of the Old Oak Road Underpass Bridge B4113. This bridge had insufficient vertical clearance as well as insufficient horizontal clearance for the widening of the road. Furthermore, the existing precast beam and slab deck has suffered from repeated vehicular impact damage over the years, resulting in continued costly repairs. This paper describes the condition of this bridge after a 54-year service life. The primary objective is to report and comment on the condition of this bridge in order for other engineers who have to rehabilitate, raise or widen similar bridges built at the same time, to have an indication of the quality of materials, workmanship, condition and behaviour. During and after the demolition operation, a visual inspection of the rubble was undertaken to evaluate the condition of this bridge which was constructed in 1963. Concrete cores taken before the demolition revealed higher concrete strengths of 50% and more. Carbonation and durability tests done on concrete fragments indicated a robust and durable structure which would easily reach its intended 100-year design life. However, overlays under the bridge reduced the vertical clearance while the expansion joint details led to reduced durability.
Highlights
1.1 Location of Old Oak InterchangeOld Oak Interchange in Cape Town is located on Trunk Road 9/1 (TR9/1) at km 18.69, approximately 1 km west of the R300 Interchange (Fig. 1)
The Old Oak Road Underpass Bridge B4113 spans were not long enough to accept the extension of the 3rd lane on each carriageway of TR9/1 underneath
Bridge B4113 was recently repaired as part of Contract Number C861.1 which ran from November 2010 to December 2011
Summary
Old Oak Interchange in Cape Town is located on Trunk Road 9/1 (TR9/1) at km 18.69, approximately 1 km west of the R300 Interchange (Fig. 1). It consists of 2 independent bridges with a horizontal clearance between the existing decks of 2.37 m. Bridge B4113 (west side), constructed in 1963, supported the two-lane northbound Old Oak Road over the dual carriageway section of TR9/1. Bridge B5884 (east side), constructed in 1993, supports the three-lane southbound Old Oak Road over the dual carriage way section of TR9/1 (Fig. 2). Abutments and piers, all founded on spread footings. The bearing system consisted of laminated elastomeric rubber pads at the piers and abutments
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
