Barrel type efficient impact drill bit for rock-socketed inclined pile construction

Abstract

The invention discloses a barrel type efficient impact drill bit for rock-socketed inclined pile construction. The barrel type efficient impact drill bit comprises a circular drill barrel, a tooth holder, a single-acting device and a reverse circulation deslagging device, wherein deformed steel bars are spirally welded to the outside of the circular drill barrel, so that the impact drill bit can rotate under the action of water flow; the tooth holder is in an inwards-concave circular step shape, and five circles of impact teeth in different arrangement modes are designed at different radii ofthe lower end of the tooth holder, so that the effects that cutting teeth are evenly abraded, rock is efficiently broken, and hole deviation is kept stable can be achieved; the single-acting device islocated above the circular drill barrel and is matched with the reverse circulation deslagging device and a rotary connector of an auxiliary rope, so that the impact drill bit rotates without influence of upper drilling tools such as a main rope and the auxiliary rope, i.e. the rotating angle of the drill bit can be controlled; and the reverse circulation deslagging operation can be performed atthe same time by the reverse circulation deslagging device in a impact rock breaking process, the impact teeth make contact with fresh bed rock every time, and repeated breaking is avoided, so that the impact hole-forming efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of engineering pile foundation construction, and in particular relates to a cylindrical high-efficiency percussion drill bit for rock-socketed inclined pile construction. Background technique [0002] With the rapid development of my country's sea area economy, a large number of coastal cities are building many high-piled multi-functional berth terminals, and the terminals and their structures are mostly based on offshore pile foundations. In order to meet the pressure bearing, pulling resistance, shear resistance and vertical requirements of the pile foundation, the pile foundation part is designed as a rock-socketed cast-in-place oblique pile, and the bearing layer at the pile end enters the medium and slightly weathered bedrock. [0003] In the construction of rock-socketed inclined piles, especially when the rock-socketed inclined piles are constructed on rivers or seaport wharves, the construction platf...

AI Technical Summary

Problems solved by technology

[0005] (1) The impact hole forming efficiency is low, usually less than 0.1m / h;

[0006] (2) The impact drill only provides impact force during the impact process, and cannot correct the drilling direction;

[0007] (3) The rotary motion of the impact drill bit is affected by the helical thread on the outer wall of the drill bit and the lifting wire rope during the impact process, and the rotation direction and angle are not controlled;

[0008] (4) During the impact of the drill bit, the mud in the hole is in a state of no circulation, resulting in poor air cleanliness and repeated rock breaking by the drill bit

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