Method and percussion bit for drilling back taper hole in concrete wall

Abstract

The invention discloses a method and a percussion bit for drilling a back taper hole in a concrete wall. The method includes adding a ball on a handle of the percussion bit, clamping a spherical clamp seat onto the ball of the handle which rotates, with the center of the ball as the support, within the clamp seat; during drilling, subjecting the percussion bit perpendicular to the wall to drilling downwards, and after the clamp seat is abutted against the wall, shaking the handle to drill with the center of the ball with the support, allowing the bottom of the bit to rotate at the bottom of the hole, in this way, a big-end-down back taper hole is formed. The method is simple and practical and convenient to drill the back taper hole in the wall. Through the back taper hole, the bottom of an expansion bolt is fully expanded, and friction between the expansion bole and the wall of the back taper hole is greatly improved, so that pull force applied to the expansion bolt is more than doubled. By the use of the method easy to handle, safety is improved after construction site supports or pipelines assembly, and construction is convenient.

Description

technical field [0001] The invention relates to a method for drilling an inverted cone hole on a concrete wall and an impact drill bit used, belonging to the technical field of building installation. Background technique [0002] In building construction, it is often necessary to fix some brackets on the wall for installation of construction equipment. At present, the most commonly used method is to use expansion bolts to connect with the wall. After the expansion bolt is tightened, the extrusion friction force is generated between the outward expansion force of the bottom of the bolt and the concrete hole to prevent the bolt from being pulled out of the wall. However, most of the holes drilled by the current percussion drill are cylindrical holes. Although the expansion bolts have a certain tensile force and can meet the general construction needs, when the bracket is very heavy or a bracket needs to bear more weight, Conventional expansion bolt holes limit the amount of e...

AI Technical Summary

Problems solved by technology

However, most of the holes drilled by the current percussion drill are cylindrical holes. Although the expansion bolts have a certain tensile force and can meet the general construction needs, when the bracket is very heavy or a bracket needs to bear more weight, Conventional expansion bolt holes limit the amount of expansion at the bottom of the expansion bolt, reduce the friction between the expansion bolt and the concrete hole, and affect the tensile performance of the expansion bolt

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