Heritage Cases

The project entails the construction of a 5.5m wide surfaced access road 2100m in length, a bridge over the Ncera River and two culverts over smaller drainages including the following components; • 2125m of 5.5m wide Asphalt surfaced road. • Edge strips and gravel shoulders on both sides. • Concrete and stone pitched channels at steep sections and in cuttings. • 200m of Concrete slab road at steep section before Ncera village. • Twenty 600mm diameter concrete pipe culverts. • In and outlet structures with erosion protection • Two pre-cast culvert stream crossings • An in-situ casted concrete bridge over the Ncera River The link road is a rural road with a road class that falls within the mixed (low order) category, with a design speed of 40-60km/h with a ceiling speed between 30 and 50km/h. Due to the steepness of some sections, a design speed of 30km/h will be used. The size of all the pipe culverts will be standardized. The spacing of the culverts will be adjusted according to the catchment area of each. The pipes to be used will be 600 diameter 100D Concrete pipes. There are two major culverts on the route. Culvert No 1 is at chainage 770m and Culvert No 2 is at chainage 1815m. A proposed bridge will be constructed over the Ncera River. The bridge width is 6.2m of which 5.5m is the driving width. The total length of the bridge is 18.4m and consists of 2 abutments and 2 piers.