Dairy Flat Culvert Construction and Road Improvement

Summary and scope

The scope of the project is – • Install 18 – 2100w x 600h x 2440l box culverts and 12 – 2500w x 220t x 2440l link slab lids. • Install 3 – 2100w x 600h x 1.22l box culverts and 2 – 2500w x 220t x 1.22l link slabs • Supply and install new base slab structure, all steel reinforcing, cast in-situ wingwalls and cast in-situ headwalls. • Supply and install scour protection to the inlet and outlet sections. • Embankment stabilisation 340 – 380m to protect against failure of the road and further cracking. • Culvert works to be conducted in two halves to keep one lane open. • All traffic control to be included. • Reinstatement of road surface (as per Regional Geotechnical Solutions pavement design Ref: RGS01626.3-AB dated 13/08/2020) • Install subsurface drainage pipe in accordance with NRLG std. dwg. R-09B in all locations where the pavement cannot drain freely. • Install new batters along Dairy Flat (as per the attached section 7 plans). • Extension of headwall faces vertically to design surface and install new guardrail to suit. • Tie into existing road surface at 15 locations. • Supply and install new 600 headwalls where they haven’t been found on the plans. • Extend existing guard rail where specified. • Steepen batters along Woodburn-Coraki Road as per attached plans and keep all works within the road reserve. • Relocation of all signs outlined in the attached plans. Please note – • Council will be purchasing the 21 box culverts and 14 link slabs; these will be stored at Dairy Flat works compound of Woodburn Coraki Road. • Expected delivery December 2023.