Improvement device for reusable expansion screw and mounting method thereof

Abstract

The invention discloses an improvement device for a reusable expansion screw. The improvement device comprises a spiral body and a bolt, wherein the spiral body is formed by spirally coiling a strip wire body; the bolt comprises a head and a rod body; and the rod body is provided with a spiral part for forming a plurality of equal-pitch spiral teeth, the spiral teeth form a shape of taper thread at the bottom end of the rod body, and the maximum outside diameter of the first spiral tooth counted from the bottom end of the rod body is greater than the inside diameter of the spiral body. Therefore, in mounting steps, when the first spiral tooth is combined in a clearance of the spiral body, and after the rod body of the bolt and the spiral body are inserted into an object to be constructed at the same time by an operator to form a circular long pore canal with enough depth, the first spiral tooth with enough depth can be gradually screwed with the spiral body by means of rotating the head of the bolt no mater in a normal or abnormal use state so that the spiral body moves and expands relative to the bolt and then the bolt and the object form strong connection.

Description

technical field [0001] The invention relates to an expansion screw, in particular to a construction step in which the operator inserts the rod body and the spiral body of the bolt into the round and elongated perforation of the object to be constructed. The rod body of the bolt moves and expands to strongly connect the bolt and the improved device and installation method of the reusable expansion screw. Background technique [0002] At present, the common expansion screw is mainly composed of a sleeve with a plurality of blades and a bolt that goes through the sleeve. One end of the bolt is tapered, and the other end is provided with thread, so that the bolt passes through the sleeve. When the cylinder is inserted into the circular elongated hole of the concrete at the same time, the bolt is rotated to move the bolt relative to the sleeve, and when the blades of the sleeve are pushed through the tapered end of the bolt, the blades can be radially expanded and positioned. On...

AI Technical Summary

Problems solved by technology

[0007] In the process of connecting objects, the operator must apply a strong torsional force to the bolt to make the helix expand radially. Therefore, when the strength of the bolt is insufficient, there is often a problem of bolt breakage

[0008] Furthermore, under the above-mentioned abnormal use situation, when the depth of the elongated circular perforation e1 on the object e is insufficient, the spiral body b will be compressed at the bottom of the elongated circular perforation e1 by the entry end of the bolt c rod body c2 (such as Figure 16A , Figure 16B As shown), it is also impossible to make the thread on the bolt shank threaded with the helix, so that the helix cannot radially expand to connect the object

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