Grayston Pedestrian and Cycle Bridge explained

Bridge Name:Grayston Pedestrian and Cycle Bridge
Official Name:Kopanang Bridge (proposed)
Carries:Cycle and pedestrian traffic
Crosses:M1 motorway
Location:Johannesburg
Mainspan:100m
Length:176m
Width:7.65m
Open:18 May 2018
Coordinates:-26.1075°N 28.0764°W

The Grayston Pedestrian and Cycle Bridge, previously also known as The Great Walk Bridge, forms part of a 5 km dedicated path between Alexandra on the eastern and Sandton on the western side of the M1 motorway in Johannesburg. Proposals have been made by City of Johannesburg to adopt the official name Kopanang Bridge.

Structural design

The bridge is a cantilever spar cable-stayed bridge and is designed to fit snugly just north of the Grayston Drive interchange with M1 motorway.[1] The straight central section of the bridge is 176m long and consists of three spans. The two short spans are 38 m long and cross the on and off ramps on the eastern and western sides respectively. The main span of the bridge is 100m long and consists of a single and continuous cable-stayed deck supported by a single 70m high inclined pylon -26.1075°N 28.0764°W on the western side and by a pier on the eastern side. The deck is suspended by means of nine cables extending diagonally from the pylon and attached to the deck along the median.The pylon is inclined towards the west and is restrained by a double set of nine cables extending down to a pair of plinths at ground level.

Collapse during construction

On 14 October 2015 temporary works erected over the busy M1 motorway collapsed onto the passing traffic.[2] Two people were killed and 19 were injured in the collapse which blocked both the north and southbound traffic.[3] At the time of the collapse very little permanent works had been executed by the contractor. Piling on the western side in the vicinity of the foundations for the pylon had been completed and on day of the collapse blinding concrete was being placed to the base of the pylon pile cap.After the collapse the contractor adopted an alternative construction method which was analysed in December 2015.[4]

Deaths during construction

Section 32 Inquiry

Notes and References

  1. Web site: Construction of R130m Alex-Sandton bridge gets under way. jda.org.za. 19 July 2017.
  2. Web site: UPDATE: Grayston temporary works for bridge collapses onto M1. www.enca.com. 19 July 2017.
  3. Web site: Probes under way as M1 reopens. news24.com. 19 July 2017.
  4. Web site: Analysis of construction stages for travelling formwork method. lentas.com.pl. 1 September 2017.
  5. Web site: Department of Labour preliminary report on the incident investigation into Grayston Drive Pedestrian and cyclist structural bridge collapse — Department of Labour. dead. https://web.archive.org/web/20151106231559/http://www.labour.gov.za/DOL/media-desk/media-statements/2015/department-of-labour-preliminary-report-on-the-incident-investigation-into-grayston-drive-pedestrian-and-cyclist-structural-bridge-collapse. 2015-11-06.

  6. //www.enca.com/south-africa/presiding-inspector-appointed-grayston-bridge-collapse-inquiry

  7. Web site: Labour hosts media briefing on Grayston Drive Pedestrian and cyclist structural bridge collapse.
  8. Web site: Grayston bridge collapse inquiry begins next week.
  9. Web site: Grayston Bridge inquiry to resume in September — Department of Labour. dead. https://web.archive.org/web/20170910220635/http://www.labour.gov.za/DOL/media-desk/media-alerts/grayston-bridge-inquiry-to-resume-in-september?platform=hootsuite. 2017-09-10.
  10. Web site: Archived copy . 2018-03-26 . 2017-09-29 . https://web.archive.org/web/20170929154732/http://www.labour.gov.za/DOL/media-desk/media-statements/2017/grayston-bridge-inquiry-postponed-to-july-2018-after-concluding-with-expert-witnesses . dead .
  11. Web site: Department of Labour Chief Inspector appoints Maphaha as new presiding officer of Grayston Drive pedestrian and cyclist structural bridge collapse inquiry — Department of Labour . 2018-03-09 . 2018-08-11 . https://web.archive.org/web/20180811043331/http://www.labour.gov.za/DOL/media-desk/media-statements/2018/department-of-labour-chief-inspector-appoints-maphaha-as-new-presiding-officer-of-grayston-drive-pedestrian-and-cyclist-structural-bridge-collapse-inquiry?platform=hootsuite . dead .

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