1. Rotary drilling rig: Rotary drilling rig cooperates with impact hammer to drill hard stratum first, and then dig holes.
2. Rotary drilling rig:? Compressed air is converted into mechanical energy to break rocks.
Second, the work characteristics are different.
1. Rotary drilling rig: If equipped with a drilling rig with enlarged head, reaming can be carried out at the bottom of the hole. Rotary drilling rig adopts multi-layer telescopic drill pipe, which has the advantages of less auxiliary drilling time, low labor intensity, no need for mud circulation slag discharge and cost saving, and is especially suitable for the foundation construction of urban construction.
2. Rotary drilling rig:? Filter slag in time during drilling, and pay attention to the change of stratum at any time. Take a slag sample from the stratum change, judge the geological type, record it in the record table, and compare it with the geological profile provided by the design. Drill residue samples should be numbered and kept for future analysis.
Third, the use is different.
1, rotary drilling rig: mainly suitable for the construction of sandy soil, cohesive soil, silt and other soil layers, and widely used in the construction of bored piles, underground continuous walls, foundation reinforcement and other foundations.
2. Rotary drilling rig:? In addition to all kinds of rotary bucket operations, rotary drilling rig is also equipped with wall protection drilling, and pipe shaker and grab bucket are used for casing coupling construction. Cooperate with telescopic guide grab for diaphragm wall construction and DTH hammer for hard rock crushing construction; After replacing the operating device, it can also carry out rotary jet construction and positive circulation construction; Hydraulic hammer, vibrating hammer and diesel hammer can also be equipped for other forms of pile foundation construction.