Drum drill for drilling anchor rod

Abstract

The invention relates to a drum drill for drilling an anchor rod, and belongs to the technical field of a foundation fixation building in soil layer drilling. The drum drill comprises a drum drill body and a drill bit, wherein a first through hole which passes through in the axial direction is formed in the drum drill body; a sliding casing is arranged inside the first through hole; a hole expanding blade is arranged on the casing; a base is manufactured at one end of the casing; a second through hole is formed in the base; an opening is formed in a side wall of the casing. During use, the casing slides and is completely fed into the first through hole, one end of the casing is in sealed meshing with the other end of the drum drill body, then the casing and the drum drill body can rotate synchronously; meanwhile water flows through the second through hole and the first through hole in sequence and is ejected out from the first through hole; when the base and the opening completely slide off the first through hole, the hole expansion blade extends outside the sleeve from the opening, and at the same time the water flows through the second through hole and the opening in sequence and is ejected out from the opening. The drum drill is simple in overall structure and reliable in action, and drilling, hole expansion, grouting and drill bit withdrawing can be completed at one time.

Description

technical field [0001] The invention relates to a drill bit, which belongs to the technical field of foundation fixed buildings drilled into soil layers. Background technique [0002] In the construction of foundation pits, slopes, tunnels, and underground pipelines in transportation, municipal, construction, hydropower, and mining engineering, it is often necessary to drill holes on the ground. It is often necessary to drill the bottom of the hole in order to increase the load-bearing area. Or other areas to be expanded, this kind of reaming project can not be completed with ordinary drills, and requires professional reaming drills to complete. [0003] Existing reaming drills at present mostly adopt pneumatic reaming drills and hydraulic-mechanical variable-diameter reaming drills while drilling. According to the applicant's understanding, the wind direction of the pneumatic reaming bit is all downward or blowing to the side, so the cut soil during reaming can easily bloc...

AI Technical Summary

Problems solved by technology

According to the applicant's understanding, the wind direction of the pneumatic reaming drill bit is all downward or blowing to the side, so the soil cut off during reaming can easily block the existing drill hole and fill the drill bit, and the action is unreliable

The hydromechanical variable-diameter reaming bit controls the opening and closing of the reaming cone arm through the hydraulic system, and the reliance on the hydraulic system makes the overall structure complex and the action unreliable

[0004] At the same time, the reaming and drilling in the existing civil engineering construction are completed separately. The drill bit is specially used for anchor rod drilling in civil engineering. The drill bit has a single function and is only used for drilling. Another special reaming drill bit is used for reaming.

Images