Table 6.2 The types of beddings and their strength factors Strength factor Type of bedding Earth bedding First class bedding Concrete cradle bedding | D Well tamped earth Ground shaped to seat pipe (a) First class bedding K 2.0 2.3 3.7 Fig. 6.4 Types of beddings. D d (b) Concrete cradle bedding 0.25 0.25 A pipe whose edge bearing resistance is 43 kN/m and internal diameter 600 mm is chosen to be used for a culvert. The earth cover on the pipe is 2 m. Two IRC Class A vehicles are to be considered for live load. If C, = 0.022, C, = 2 and the unit weight of soil is 18 kN/m, choose the bedding for the pipe.