Complete-set steel casing construction method of concrete cast-in-place bored pile passing through underground gallery

Abstract

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.

Description

technical field [0001] The invention relates to the field of bored cast-in-place pile construction, in particular to a construction method for a complete steel casing of a concrete bored cast-in-place pile passing through an underground corridor. Background technique [0002] Bored cast-in-situ pile is a kind of pile foundation type widely used in engineering fields such as construction, municipal administration, and water conservancy. The prior art is to utilize a rotary drilling rig to carry out bored cast-in-place pile construction. It has the advantages of strong maneuverability, fast moving speed, high drilling efficiency and low environmental pollution. However, if the pile foundation needs to pass through loose soil and abandoned underground corridors, the loose soil will cause collapse holes, and the underground corridors will cause the concrete mixture to flow rapidly in the underground corridors. effective solution. Chinese patent document CN 109868810 A is a dry...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a construction method for a complete set of steel casings for concrete bored piles passing through underground corridors, which can solve the problem of loose soil borehole retaining walls, and can also solve the problem of concrete pouring of pile foundations and underground corridors. The problem of the separation between roads and the difficulty of drilling the concrete roof and floor of the underground corridor are difficult. In the preferred scheme, it can also solve the problem of installing the separation steel casing for separation, and solve the problem during the pouring process. The gap between the separating steel casing and the retaining wall steel casing is too large, which is easy to cause slurry leakage

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