Full Displacement Pile FDP Tool Bit

• Structure: Conical spiral drill bit with a male or female joint on the upper end, cutting teeth on the lower end, and a concrete outlet.
• According to the role during drilling, it is divided into loosening section, squeezing section, stabilization section and reinforcement section from bottom to top.
  1) Loosening section – the drill teeth loosen the soil and transport it upward through the blades
  2) Squeezing section – the conical drill rod squeezes the soil upward into the pile hole
  3) Stabilization section – the cylindrical drill rod further squeezes the squeezed soil to form a stable pile hole wall
  4) Reinforcement section – when lifting the drill, the drill rotates to squeeze the fallen soil back into the pile hole.

FDP soil-squeezing pile drill bit refers to a method of drilling the soil-squeezing drill bit into the ground with the help of the powerful torque and feed force provided by the drilling rig, squeezing the soil in the space occupied by the drill bit into the surrounding soil, and pouring concrete while lifting the drill bit.

• The center tube is made of high-strength steel pipe 35CRMO quenched and tempered steel pipe
• The outer side uses 30crmoti key strips as wear-resistant strips to ensure strength and wear resistance
• The spiral blade is 30mm thick, and the outer side uses 30crmoti key strips as wear-resistant strips to make the outer side of the drill blade more wear-resistant.

• High bearing capacity – The soil in the center of the pile hole is squeezed to the surrounding of the pile hole, thereby producing high-density soil, which can effectively increase the friction and bearing capacity of the pile.
• Reduce waste – When drilling underground, the extrusion and expansion drill is drilled into the ground, and the drilled soil will be completely squeezed around the pile hole instead of being discharged to the ground outside the hole. The transportation cost of the slag is reduced. In addition, there is less waste on the construction site, which makes construction more convenient.
• Reduce concrete consumption – Compared with other bored piles, the concrete over-cubic ratio is significantly reduced. Save concrete.
• Small vibration during construction – During construction, the extrusion and expansion drill is drilled into the ground by a rotary drilling rig, and the vibration is very small, which will not cause vibration of nearby buildings, thereby avoiding cracking and collapse of buildings.
• High construction efficiency – Since there is no need to take the slag out of the hole, the construction efficiency is much higher than that of ordinary rotary piles.