Method for fixing object and expansion bolt and special borer for method

Abstract

The invention relates to a method for reserving a hole on a wall to fix an object and an expansion bolt and a special borer for the method. The method mainly includes: drilling a blind hole according to a traditional method; boring a expansion hole which has larger diameter than the blind hole at the bottom of the blind hole with the special borer so as to form a stepped face; inserting the expansion bolt into the blind hole; mounting the object to be fixed; and sleeving a washer and tightening a nut with a wrench. During the tightening process, a lamina at the tail of an expansion sleeve is pressed by the bolt tail to curve outwardly so as to form a turnup clamping to the stepped face. Due to the fact that slide static friction force generated by radial extrusion force between the lamina at the tail of the expansion sleeve and concrete is changed into axial clamping force of the lamina to the concrete, anti-off performance and safety performance of the expansion bolt is improved. The method is suitable for fixing heavy and vibrative objects such as a high-power air-conditioning outdoor unit, a ceiling fan, and supports of large billboards.

Description

technical field [0001] The invention relates to a method for making wall holes and fixing objects on materials such as concrete and bricks of a building, and expansion bolts and special boring tools used in conjunction with the method, which are suitable for use on the ground, top wall or side wall of a building Used for fixed objects. Background technique [0002] The existing methods for fixing objects on the ground, ceiling or side walls of buildings usually adopt such as figure 1 The traditional expansion bolt shown is composed of a nut 1, a spring washer 2, a flat washer 3, an expansion sleeve 4 and a screw rod 5. The tail of the expansion sleeve 4 is open, and the screw shaft and the screw tail 51 are transitionally connected by a cone. During use, the afterbody of expansion bolt is stretched forward in the pre-drilled wall hole, after installing the object that needs to be fixed, then put on spring washer 2, flat washer 3 and fasten with nut 1. When the nut 1 is tig...

AI Technical Summary

Problems solved by technology

When the load is large or it is used in a place with vibration, a small amount of sliding friction will occur between the expansion sleeve and the hole wall of the concrete 9. As time accumulates, the sliding amount increases, and the object may fall off due to the loosening of the expansion bolt. Therefore, the industry does not recommend expansion bolts for fastening ceiling fans and other objects.

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