| 词条 | Grayston Pedestrian and Cycle Bridge |
| 释义 |
|bridge_name=Grayston Pedestrian and Cycle Bridge |image= |caption= |official_name=Kopanang Bridge (proposed) |carries=Cycle and pedestrian traffic |crosses=M1 motorway |location=Johannesburg |maint= |id= |design= |mainspan=100m |length=176m |width=7.65m |height= |load= |clearance= |below= |traffic= |open=18 May 2018 |closed= |toll= |troll= |map_cue= |map_image= |map_text= |map_width= |coordinates = {{coord|26|6|26.85|S|28|4|35.14|E}} | website = }} The Grayston Pedestrian and Cycle Bridge, previously also known as The Great Walk Bridge, forms part of a 5km 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 designThe bridge is a cantilever spar cable-stayed bridge and is designed to fit snugly just north of the {{Jct|country=ZAF|JM|40}} 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 {{coord|26|6|26.85|S|28|4|35.14|E}} on the western side and by a pier on the eastern side. The deck is suspended by means of 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 constructionOn 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
References1. ^{{cite web|url=http://www.jda.org.za/index.php/latest-news/1644-construction-of-alex-sandton-bridge-under-way|title=Construction of R130m Alex-Sandton bridge gets under way|website=jda.org.za|accessdate=19 July 2017}} {{Africa-bridge-struct-stub}}{{SouthAfrica-struct-stub}}2. ^{{cite web|url=http://www.enca.com/south-africa/grayston-bridge-over-m1-highway-collapses|title=UPDATE: Grayston temporary works for bridge collapses onto M1|website=www.enca.com|accessdate=19 July 2017}} 3. ^{{cite web|url=http://www.news24.com/SouthAfrica/News/Probes-under-way-as-M1-reopens-20151015|title=Probes under way as M1 reopens|website=news24.com|accessdate=19 July 2017}} 4. ^{{cite web|url=http://www.lentas.com.pl/portfolio/grayston-bridge/|title=Analysis of construction stages for travelling formwork method|website=lentas.com.pl|accessdate=1 September 2017}} 5. ^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 6. ^://www.enca.com/south-africa/presiding-inspector-appointed-grayston-bridge-collapse-inquiry 7. ^http://www.sowetanlive.co.za/news/2016/02/11/grayston-bridge-collapse-inquiry-begins-next-week 8. ^http://www.labour.gov.za/DOL/media-desk/media-alerts/grayston-bridge-inquiry-to-resume-in-september?platform=hootsuite 9. ^://www.labour.gov.za/DOL/media-desk/media-statements/2017/grayston-bridge-inquiry-postponed-to-july-2018-after-concluding-with-expert-witnesses 10. ^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 3 : Cable-stayed bridges|Bridges in South Africa|Footbridges |
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