The invention provides a complete-set steel casing construction method of a concrete cast-in-place bored
pile passing through an underground gallery. The method comprises the steps that a locating steel casing is buried; a rotary-digging drilling bucket or an
auger bit is utilized to
drill a hole in a soil body, and a protection steel casing follows up synchronously in the drilling process; when agallery top plate of the underground gallery is reached, a cylindrical
coring bit is used instead for drilling on the gallery top plate, and the drilling tool is lifted up after penetration to take out a concrete core; the cylindrical
coring bit continues to be utilized to
drill through a gallery bottom plate of the underground gallery, and the drilling tool is lifted up to take out the concretecore; a partition steel casing is placed down; the rotary-digging drilling bucket is used instead to continue to
drill into undisturbed soil and
bed rock to a designed end hole position; a flat-bottomed rotary-digging drilling bucket is utilized to remove
sediment at a hole bottom to ensure that the thickness of the
sediment is controlled within a standard allowed range; a reinforcement cage is placed down;
pile foundation concrete pouring is performed; the protection steel casing and the locating steel casing are taken out, and concrete is poured as supplement to finishing elevation; and construction of the concrete cast-in-place bored
pile passing through the underground gallery is realized through the steps. Through the method, a
working environment is obviously improved, and the methodis more
environmentally friendly.