THE UPGRADE OF 33.7 KM OF NATIONAL ROUTE N2, BETWEEN MTUNZINI TOLL PLAZA (SECTION 28, KM 42.7) AND EMPANGENI T-JUNCTION (SECTION 29, KM 13.0) CONTRACT NUMBER: NRA N002-289-2012/1 CLIENT: SOUTH AFRICAN NATIONAL ROADS AGENCY SOC LIMITED CONSULTANT: UWP CONSULTING (PTY) LTD CONTRACTOR: CONCOR INFRASTRUCTURE PRESENTED BY: STEWART WILSON (RESIDENT ENGINEER)
OVERVIEW OF THE CONTRACT Went to tender: Design (2010) Construction (September 2015) Tender Awarded: December 2015 Handover of project to contractor: February 2016 Project completion date: March 2019 Contract Duration: 37 months Total CPG Target: 18% Estimated Contract Value: R900 million
PAVEMENT DESIGN FOR THE NEW CARRIAGEWAY Surfacing: 20mm UTFC 40mm Continuously graded asphalt wearing course Basecourse: 80mm Asphalt Basecourse (BC3) Upper Subbase: 150mm C3 Stabilised Crushed Gravel Lower Subbase: 150mm C3 Stabilised Crushed Gravel Upper Selected Layer: 150mm G7 Natural Gravel Lower Selected Layer: 150mm G9 Natural Gravel
CONTRACT PARTICIPATION GOALS Targets Achieved Target Area Labour 6% 6,36% 352/494 SCD 12% 7,9% 19/29 Total 18% 14,26%
TRAINING Students: 4 interns with contractor 4 interns with engineer 1 OHS intern 12 ‘go for gold ‘ students Programme Generic (R25 000) NQF 3(R250 000) NQF 4 (R235 000) SMME (R190 000) Progress 6 of 8 Modules – R336 625
RIVER BRIDGES Mlalazi River Bridge (B1085A) Four span structure with 29.5m long spans Simply supported precast, prestressed concrete beam deck and 3 internal wall type piers Using a combination of pad type footings and 32 x 900mm diameter bored piles, ranging in depths from 16m to 23m
RIVER BRIDGES Umhlathuze River Bridge (B484A) Eight span structure with 29m long spans Simply supported prestressed beam and slab deck construction with 7 internal wall type piers Piers founded on 70 x 900mm diameter bored piles to depths between 45m to 62m
OVERPASSES & UNDERPASSES Ridge Bridge (B1416) Windy Ridge Bridge (1086) Port Durnford Bridge 1 (B1087) Mzingwenya Agricultural Overpass (B1090) Underpasses Port Durnford Bridge 2 (B1088A) Sugar Mill Bridge (B485) CFA Piling at Mzingwenya Overpass Mzingwenya Overpass Removing Jackspan
MAJOR BOX CULVERTS 16 Major box culverts with numerous smaller box culverts that require lengthening
FACTS AND QUANTITIES Mass of reinforced concrete Major Structures: 11500 m3 (28 750 tons) Minor Structures: 5 000 m3 (12 500 tons) Total mass of reinforced concrete: 16 500 m3 Length of piles 600mm diameter CFA piles: 0.38 Km 900mm diameter bored piles: 4. 36 Km Total length of piles: 4.74 Km Mass earthworks: 900 000 m3 Asphalt to be paved: 90 000 tons