Construction World December 2019

Category: Specialist Contractors or Suppliers

THE LEONARDO The Leonardo in Sandton, being constructed by Aveng Grinaker-LTA for 75 On Maude is a partnership between Legacy and Nedbank. This mixed-use high-rise development will, on completion, be the tallest building in Africa. The achievement on this project has greatly contributed to the knowledge and skills set of the South African construction industry for high-rise buildings.

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GHOLYHULQJ WR VLWH :KLOH WKLV PL[ LQFUHDVHG ZRUNDELOLW\ PRUH precautions had to be taken to counteract friction stresses in the SODFLQJ SLSHV DQG EHWZHHQ WKH FRQFUHWH IRUPZRUN LQWHUIDFH 7R WKLV effect the normal aggregate size of 22 mm for structural concrete ZDV UHGXFHG WR PP DQG PP &RQFUHWH IRU WKLV SURMHFW ZDV EHLQJ VXSSOLHG RQ D KRXU EDVLV WR DFKLHYH WKH YHU\ WLJKW VHYHQ GD\ ͥRRU WR ͥRRU F\FOH SODFLQJ H[WUD GHPDQG RQ WKH VXSSO\ WHDP 7R FRQWURO WKH YHUWLFDO DOLJQPHQW RI 7KH /HRQDUGR VWDWH RI WKH DUW VSHFLDOLVHG *36 WHFKQRORJ\ ZDV XVHG 7KLV WHFKQRORJ\ LV EDVHG RQ D series of automated sensors employed to deliver precise and reliable FRRUGLQDWHV RQ GHPDQG QRW LQͥXHQFHG E\ ZLQG ORDGV FUDQH ORDGV FRQVWUXFWLRQ VHTXHQFH RU RWKHU IDFWRUV 7KHVH FRRUGLQDWHV DUH XVHG to control the position of the hydraulic climbing and slab edge prior WR HDFK FRQFUHWH SRXU 7KLV SURMHFW PRUH VR WKDQ PDQ\ RWKHUV FDOOHG IRU FRQWLQXRXV GLVFXVVLRQV EHWZHHQ WKH GHYHORSHU DUFKLWHFW HQJLQHHU DQG WKH FRQWUDFWRU ƒ

OLQHV 7KH $IUL6DP :\QEHUJ WHDP PHW WKH FKDOOHQJH KHDG on and with very little delay to WKH FRQVWUXFWLRQ VFKHGXOH WKH FRQFUHWH FDVWLQJ ZDV EDFN RQ WUDFN ZLWKLQ VSHFLͤFDWLRQ To counteract friction stresses in pumping concrete at the KHLJKWV UHTXLUHG RQ WKLV SURMHFW WKH DJJUHJDWH VL]H ZDV UHGXFHG IURP WKH FRQYHQWLRQDO PP WR PP DQG PP ,QGLYLGXDO FROXPQV were cast in a single pour of 55 m 3 of concrete and 19 tons of steel UHLQIRUFLQJ ZDV SODFHG LQVLGH WKH PHWUH KLJK ZDOOV +L WHFK VRQLF YLEUDWRUV ZHUH VXFFHVVIXOO\ XVHG IRU RSWLPXP FRPSDFWLRQ 6SHFLͤF DFFRODGHV JR WR WKH FRQFUHWH WHDP IRU SURGXFLQJ TXDOLW\ FRQFUHWH FRQVLVWHQWO\ DOZD\V RQ WLPH WR JXDUDQWHH XQLQWHUUXSWHG FRQVWUXFWLRQ One of the greatest challenges on this project was the vertical FRQFUHWH SXPSLQJ KHLJKW RI PHWUHV 7R RYHUFRPH WKLV FKDOOHQJH DQG WR DYRLG DQ\ EORFNDJHV LQ D PHWUH SOXV SLSHOLQH VSHFLDOO\ IRUPXODWHG FRQFUHWH PL[HV ZHUH XVHG IRU RSWLPDO SHUIRUPDQFH $ VXSHUSODVWLFLVHU ZDV XVHG WR HQVXUH D ͤYH KRXU ZRUNDELOLW\ RI WKH FRQFUHWH PL[ ZKLFK DOVR DOORZHG IRU SRWHQWLDO WUDͦF GHOD\V

• Company entering: AfriSam • Client: 75 On Maude • Start date: 2015 • End date: December 2019 • Main contractor: $YHQJ *ULQDNHU /7$ • Principal agent: Legacy Group • Concrete supplier: AfriSam PROJECT INFORMATION

B E S T P R O J E C T S 2019

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