A kind of anti-collapse rotary excavation pile construction device and its construction method

Abstract

The application relates to a construction device and construction method for an anti-collapse rotary excavation pile, and relates to the technical field of building construction; it includes a mounting column and a casing for supporting pile holes, the casing is sleeved on the mounting column, and the casing A pouring hole is opened; a spray head is movable on the installation column, and a driving source for driving the spray head to insert or leave the pouring hole is arranged on the installation column; a concrete spraying machine is also included, and the concrete spraying machine includes a discharge pipe, One end of the discharge pipe communicates with the nozzle. During construction, the installation column is coaxially fixed on the drill pipe of the rotary drilling rig, and the casing is sleeved on the installation column, and then the installation rod and the casing are extended into the subsidence soil layer through the rotary drilling rig; Drive the nozzle through the drive source to insert into the pouring hole, start the concrete spraying machine, and the nozzle pours concrete into the easily collapsed soil layer outside the casing; achieve the purpose of fixing the easily collapsed soil layer, prevent the pile hole from collapsing, and improve the construction quality.

Description

technical field [0001] The present application relates to the technical field of building construction, in particular to a construction device for an anti-collapse rotary excavation pile and a construction method thereof. Background technique [0002] The rotary excavation pile refers to the hole pile formed by the construction of the rotary excavator. During the construction, the rotary excavator first rotates and breaks the rock and soil through the barrel drill bit with a valve at the bottom, and directly puts the broken rock and soil into the drill bucket, and then The lifting device of the drilling rig and the telescopic drill rod lift the drill bit out of the sloped soil outside the hole pile, so that the reciprocating cycle continuously takes and unloads the soil until the drill reaches the design depth. [0003] Rotary excavation piles have been widely used in roads, railways, bridges and large buildings. For rock and soil layers with good adhesion, dry or clear wat...

AI Technical Summary

Problems solved by technology

However, when the underground soil is a pebble layer with large gaps, a backfill gravel layer, etc., it is difficult to realize the mud retaining wall, and the hole collapse phenomenon often occurs when the hole is dried, and the cost of using a steel pipe as a casing is too high, and the construction period is too long. many

[0004] During the construction process, the loose soil layer of the pile wall often collapses, and part of the soil in the loose soil layer falls into the bottom of the pile hole or the concrete and exists in the solidified concrete pile body, reducing the quality of the concrete pile body and making the pile foundation The carrying capacity is reduced

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