Silent refuse soil discharge drill bit used for cast-in-place bored pile construction of rotary drilling rig

Abstract

The invention discloses a silent refuse soil discharge drill bit used for cast-in-place bored pile construction of a rotary drilling rig. The silent refuse soil discharge drill bit comprises a drill tube, a square-head upper plate assembly, a left and right drill board, a refuse soil discharge plate, a plurality of dowel bars and a pressure plate, wherein the square-head upper plate assembly is fixed to the top end of the drill tube, the left and right drill board is fixed to the bottom end of the drill tube, the refuse soil discharge plate and the multiple dowel bars are arranged in the drilltube, and the pressure plate is located right above the square-head upper plate assembly and is of a circular ring-shaped structure; the top ends of the multiple dowel bars all pass through an upperplate of the square-head upper plate assembly and are fixedly connected with the pressure plate; and the bottom ends of the multiple dowel bars are fixedly connected with the refuse soil discharge plate. According to the silent refuse soil discharge drill bit, the pressure plate and the refuse soil discharge plate are fixedly connected through the dowel bars; when the drill bit is lifted out of abore, a circular disk on a drill stem presses down the pressure plate to push the dowel bars to push the refuse soil discharge plate, and thereby, refuse soil in the drill tube is rapidly pushed out of the drill tube; the drill bit can be used for different soil layers, has small noise and a wide application range; and in addition, the drill bit has the advantages that construction is convenient,the operation habit of a drilling rig does not need to be changed, the construction efficiency is high, cost is saved, and the economic benefit is improved.

Description

technical field [0001] The invention relates to the field of drill bits for bored pile construction, in particular to a silent slag discharge drill bit used for the construction of bored piles by rotary drilling rigs. Background technique [0002] With the development of science and technology, pile foundations are widely used in the fields of subway construction, stations, airports and housing construction due to their large bearing capacity and stable structure. However, how to control the noise during the construction of existing pile machines is a major difficulty. The commonly used method at present is: quickly rotate the drill rod forward and backward, drive the drill bit, and throw out the muck; adopt the fast retractable main cable to shake out the muck in the drill bit. However, from the perspective of construction, its defects mainly include the following aspects: 1. Long-term shaking of the main cable will accelerate the aging speed of the cable. 2. For the cohes...

AI Technical Summary

Problems solved by technology

However, from the perspective of construction, its defects mainly include the following aspects: 1. Long-term shaking of the main cable will accelerate the aging speed of the cable

2. For the cohesive soil layer, it is difficult to throw out the muck and the efficiency is low

3. Rapid rotation of the drill pipe will produce loud noise

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