Drilling tool and construction method for long spiral compacted hole-forming bored concrete pile

Abstract

The embodiment of the invention discloses a drilling tool and a construction method for a long spiral compacted hole-forming bored concrete pile. The drilling tool for the long spiral compacted hole-forming bored concrete pile includes a plurality of drill rods and a cone-shaped drill bit, wherein connecting flanges are correspondingly arranged at the two ends of each drill rod and the upper end of the cone-shaped drill bit, and cavities which can communicate with one another are formed in the drill rods and the cone-shaped drill bit; and a movable door for enabling the cavities to communicatewith the outside in time are arranged at the lower end of the cone-shaped drill bit, spiral plates are arranged on the circumferential surfaces of each of the drill rod and the cone-shaped drill bit,and the drill rods can be connected with each other to form a cylindrical body through the connecting flanges. According to the drilling tool and the construction method for the long spiral compactedhole-forming bored concrete pile, low construction noise and no pollution are achieved, and virtual soil at the bottom of a hole does not need to be cleaned after drilling, protruding of a pile material from the cone-shaped drill bit determines the long spiral drilling bored concrete pile without pile bottom sediment, and the effect of the ultimate end resistance of the pile bottom soil is improved.

Description

technical field [0001] The invention relates to the technical field of building foundation treatment, in particular to a drilling tool and a construction method for long spiral compacted hole-forming cast-in-place piles. Background technique [0002] With the continuous development of construction technology, the composite foundation has developed from flexible to semi-rigid to rigid composite foundation. The rigid composite foundation is to set a flexible cushion layer between the foundation and the foundation to give full play to the bearing capacity of the soil between the piles and make the foundation strength And the deformation modulus is relatively uniform, which is extremely beneficial to improving the structural force, the structural seismic level, and reducing the construction cost. [0003] Existing construction methods for rigid composite foundations mostly use vibratory sinking pipe grouting piles or rammed and expanded hole grouting piles. However, it is diffic...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a drilling tool and a construction method for long helical compacted hole-forming cast-in-place piles, so as to solve the above-mentioned problems of the existing construction methods

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