Construction World December 2019

Category: Consulting Engineers

SANI PASS PHASE 2A STRUCTURES The KwaZulu-Natal Department of Transport is in the process of upgrading the existing Sani Pass Road (P318), which transects the uKhahlamba Drakensberg Park World Heritage Site near Himeville.

T KLV SURMHFW FRQVLVWV RI WKUHH SKDVHV 3KDVHV DQG KDYH EHHQ FRPELQHG LQWR RQH SKDVH QRZ UHIHUUHG WR DV 3KDVH 3KDVH D H[WHQGV IURP NP DW WKH ROG *RRG +RSH 7UDGLQJ 3RVW ZKLFK LV DOVR WKH ERXQGDU\ RI WKH :RUOG +HULWDJH 6LWH WR NP DW WKH 6RXWK $IULFDQ 6DQL %RUGHU 3RVW 3KDVH E ZLOO H[WHQG WR WKH VXPPLW RI WKH 6DQL 3DVV DW WKH /HVRWKR %RUGHU SRVW DW NP The construction of Phase 2a has been broken up into two VHSDUDWH FRQWUDFWV QDPHO\ RQH FRQWUDFW IRU WKH VWUXFWXUHV DQG DQRWKHU RQH IRU WKH URDGZRUNV 7KH VWUXFWXUHV FRQWUDFW FRQVLVWHG RI WKH FRQVWUXFWLRQ RI VHYHQ FXOYHUWV RQH EULGJH DQG RQH 0HFKDQLFDOO\ Stabilised Earth Retaining Wall (utilising gabion cladding) structure ZKLFK LQFRUSRUDWHG D ODUJH ER[ FXOYHUW 7KH FRQVWUXFWLRQ FRQWUDFW IRU WKH VWUXFWXUHV KDV EHHQ FRPSOHWHG EXW WKH FRQVWUXFWLRQ FRQWUDFW IRU WKH URDGZRUNV LV VWLOO LQ SURJUHVV 7KLV PXOWL GLVFLSOLQDU\ SURMHFW LQYROYHG WKH VHUYLFHV RI WUDͦF HQJLQHHUV JHRPHWULF HQJLQHHUV VWUXFWXUDO HQJLQHHUV DQG JHRWHFKQLFDO HQJLQHHUV 7KH SULPDU\ FRQFHUQV ZHUH VDIHW\ VWUHQJWK VWDELOLW\ UREXVWQHVV VHUYLFHDELOLW\ HFRQRP\ FRQVWUXFWDELOLW\ DQG ORZ PDLQWHQDQFH Once the structures were sized based on the hydraulic UHTXLUHPHQWV WKH VRIWZDUH SDFNDJH 3URNRQ ZDV WKHQ XVHG IRU WKH structural analysis and design of the structures and Autodesk $XWR&$' ZDV XVHG IRU WKH SUHSDUDWLRQ RI WKH ZRUNLQJ GUDZLQJV The existing geotechnical conditions are complicated and thus the project needed a specialist geotechnical engineer to be

PROJECT INFORMATION

• Company entertering: 5R\DO +DVNRQLQJ'+9 • Client: .ZD=XOX 1DWDO 'HSDUWPHQW RI 7UDQVSRUW • Main contractor: Chris Africa Civils • Consulting engineer: 5R\DO +DVNRQLQJ'+9 6)& (QJLQHHUV 1GL]DQL &LYLO :RUNV -RLQW 9HQWXUH • Sub-consultant: Leporogo Specialist Engineers • Geotechnical expert: ARQ Consulting Engineers • Contractor: Chris Africa Civils

DSSRLQWHG $54 Consulting Engineers was appointed to facilitate the geotechnical foundation investigations DQG GHVLJQV ƒ

SAPPI TUGELA TREATED EFFLUENT PIPELINE REPLACEMENT

The project involved the replacement of an existing 3,5 km gravity 1 000 mm diameter steel treated effluent pipe with an 800 mm diameter HDPE Class 10 butt-welded pipeline. The pipe route runs from the mill, adjacent to and crossing the Mandeni Stream before discharging into a dedicated discharge point along the Tugela River.

A GGLWLRQDOO\ WKH SURMHFW LQYROYHG four road crossings and the PDLQ 0DQGHQL VWUHDP FURVVLQJ ,Q DGGLWLRQ WR UHSODFHPHQW RI the pipeline and required valve FKDPEHUV WKH FRQWUDFW DOVR LQYROYHG the rehabilitation and protection of two concrete structures at the pipe LQOHW ZLWKLQ WKH PLOO The primary objective of the project was to replace the existing gravity pipeline which had reached it design life and was showing signs

Operational shut downs of the pipeline could be accommodated but UHTXLUHG WZR ZHHNV QRWLͤFDWLRQ DQG ZHUH OLPLWHG WR QLQH KRXUV 7R DFFRPPRGDWH IRU WKLV D WZR SKDVHG DSSURDFK ZDV XVHG ZKHUHE\ LQ WKH ͤUVW SKDVH WKH SLSH ZDV FRQVWUXFWHG DQG FRPPLVVLRQHG LQ LWV HQWLUHW\ DERYH JURXQG 7KLV HQVXUHG QR GHWULPHQWDO HIIHFWV RQ WKH H[LVWLQJ SLSHOLQH 2QFH WKH DERYH JURXQG SLSH ZDV FRPPLVVLRQHG WKH H[LVWLQJ SLSHOLQH FRXOG EH H[FDYDWHG DQG WKH DERYH JURXQG SLSHOLQH FRXOG EH OLIWHG LQWR WKH H[LVWHG WUHQFK GXULQJ VPDOOHU WKUHH WR IRXU KRXU VKXW GRZQV IURP WKH PLOO 3LSHOLQHV of this diameter PROJECT INFORMATION

are not a common occurrence in the water engineering ͤHOG DQG JHQHUDOO\ are only found in bulk water and VHZDJH RSHUDWLRQV ƒ

• Company entering: JG Afrika • Client: Sappi Tugela • End date: May 2019 • Main contractor: Leomat Construction

of fatigue and potential failure due to degradation of the steel pipe ZDOO $ VHFRQGDU\ REMHFWLYH ZDV WKH UHIXUELVKPHQW RI FRQFUHWH inlet structures which required rehabilitation in order to function HͦFLHQWO\ DORQJVLGH WKH QHZ SLSHOLQH $ VWULQJHQW UHTXLUHPHQW RI WKH project was to ensure the continued operation of the existing treated HͧXHQW SLSH DV WKLV WKH RSHUDWLRQ RI WKH WUHDWHG HͧXHQW GLVFKDUJH ZDV D UHTXLUHPHQW IRU WKH PDQXIDFWXULQJ SURFHVV DW WKH PLOO

• Consulting engineer: JG Afrika • Pipe contractor: 15% 3LSLQJ

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

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