Construction Methods And Equipments

       

       You are preparing the earth moving specifications for a project that will include a wide range of materials, from loose soil to hard rock. Because of this variation, you plan to use a classified excavation system so the contractor can give two unit prices, one for common excavation and another for rock. However, to avoid disagreements on classification, you also need to develop clear definitions for each type of excavation. What criteria might you use to differentiate between common and rock excavation?

• The ease of an excavation work namely common excavation which includes soils can be excavated using scraper, ripper etc., It costs low.
• Normally in rock excavation blasting is used to make the rock fractured and loosen. Hole is drilled into the ground and an explosive will be placed and packed. Sometimes, where the noise of the blasting is unacceptable a non-sounding chemicals and a catalyst will replace an explosive. It cost high.