What are the equipments used for bored pile construction?
The drilling method of bored piles can be divided into impact drilling, rotary drilling and rotary drilling. The commonly used drilling rigs in construction are percussion drilling machine, rotary drilling rig and rotary drilling rig.
Rotary drilling can be divided into positive circulation, rotary drilling, reverse circulation and rotary drilling. Its characteristic is that the slurry circulation is different, the mud is pressed into positive circulation, and the pumping mud is reverse circulation.It is suitable for the circulation of clay, silt, fine sand, and other types of soil; reverse circulation for cohesive soil, sandy soil, sand and gravel and weathered rock, but the pebble size shall not exceed the diameter of the drill pipe 2/3, and the content is not greater than 20%.
Impact drills are mainly suitable for drilling in eggs (DRIFTS), stone soil and rock formations. The main equipment can be divided into two categories: one for the drill itself with the whole set of equipment, drilling frame, shock and lifting equipment; simple percussive drill another by double drum hoist with clutch components, the drill frame by simple rods. According to the circulation mode of the mud, the impact drill can be divided into impact positive circulation drilling and impact reverse circulation drilling.
