Combined type double-layer drill bit and self-drilling type anchoring system

Abstract

The invention belongs to the technical field of rock-soil anchoring. A combined type double-layer drill bit comprises a cross-shaped drill bit and a ball tooth drill bit, wherein the ball tooth drillbit is coaxially and correspondingly arranged at the top of the cross-shaped drill bit; the drilling diameter of the ball tooth drill bit is smaller than that of the cross-shaped drill bit. A self-drilling type anchoring system comprises the combined type double-layer drill bit, a hollow anchor rod, a water pump, a grouting pump and a drill machine, wherein the hollow anchor rod is correspondinglyarranged at the rear part of the combined type double-layer drill bit; the water pump and the grouting pump are communicated with the hollow anchor rod; and the drill machine is used for driving thehollow anchor rod and the double-layer drill bit to rotationally drill. The combined type double-layer drill bit and the self-drilling type anchoring system are reasonable in structural design, the drilling can be realized under complicated geological conditions, and the drilling precision is improved.

Description

technical field [0001] The invention belongs to the technical field of rock-soil anchorage, and in particular relates to a combined double-layer drill bit and a self-drilling anchorage system. Background technique [0002] The drill bit in the self-drilling anchoring system is one of the main components of the entire anchoring system. It is generally used for geological conditions such as soft sedimentary rocks such as marl, mudstone, siltstone and other medium-soft rock soil layers or backfill soil. Conditional drilling and anchoring; the function of the drill bit is to drill the required holes and grouting of the anchorage system at the position of the support, and after the grouting, the drill bit and the entire anchorage system become the passive support or active support. The fulcrum, so that the grouted body after grouting is firmly combined with the formation to form an anchoring system. The bit is a single-use bit that remains in the formation to be supported after ...

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Problems solved by technology

[0003] During the drilling process, due to the great difference in geological conditions, some drill bits can only be adapted to drill holes within a certain range of geological conditions. The drill bit cannot adapt to changes in hardness, which will result in a decrease in efficiency and a decrease in drilling quality; therefore, it is necessary to do a detailed geological survey before drilling to select a suitable drill bit of the corresponding type; if the geological conditions are complex, it has to be replaced during drilling Drill bits, which will affect the efficiency of drilling and prepare more drill bits in advance, resulting in waste and can not take advantage of the high efficiency of drilling, grouting and anchoring in one drilling of the self-drilling anchor system

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