Pore-forming construction method used when rotary digging cast-in-place pile meets large-particle-size pebble and pebble holding hopper drill

• Main Authors: LI DONGCHUN, HU XIAOPENG
• Format: Patent
• Language: Chinese; English
• Published: 24.11.2017
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a pore-forming construction method used when a rotary digging cast-in-place pile meets a large-particle-size pebble. The pore-forming construction method comprises the following steps: 1) feeding samples and locating; 2) taking particle samples through drilling, and judging the quality and the geologic structure of a stratum soil-rock mass according to the taken particle samples; 3) conducting rotary digging to a pebble layer by a rotary hopper drill until not performing rotary digging and going down; 4) replacing a rotary hopper drill with a pebble holding hopper drill, and holding the pebble out from the ground through drilling; 5) after the pebble is held out, replacing with a conventional rotary hopper drill again for rotary digging; and 6) circularly conducting the step 3 to the step 5 till the pebble layer is drilled out. The invention further discloses the pebble holding hopper drill which comprises a base, a square head, a drill bucket, water outlets, oblique strip teeth and dr