The main expenses of cave business are: 1, riprap, loess, cement, etc. , material price+freight+riprap. 2. After filling the materials, you can adjust the coefficient to get the desired unit price. The material price of loess in the impact quota can be considered here, so it is not necessary to set the price of loess dumping and filling. 3, steel liners to follow up. 4. The hole-forming causes the pile diameter to become larger, which increases the reaming cost. 5. The hole collapse of the original hole-forming pile needs to be re-drilled, and the cost of re-drilling needs to be compensated. 6, the cost of pouring concrete. 7, diver plugging costs.