A single-sided bolt fastener in a reversed form

Abstract

The invention relates to an overturn deforming type unilateral bolt fastener which is formed by a bolt, a jacking sleeve, an overturn deforming piece, a gasket and a nut. A bolt head and a bolt rod are in circular conical surface transition, threads are arranged at the tail of the bolt rod, and the overturn deforming piece is an annular part with certain plastic deformability. The overturn deforming piece, the jacking sleeve and the gasket are arranged on the bolt rod in a sleeved mode, and the nut is screwed at the tail of the bolt rod. In the mounting process, one side of the bolt head is stretched into a mounting hole, the operation of screwing the nut at the tail of the bolt rod is started after the bolt head reaches the inner side of the mounting hole, the nut is screwed in continually to push the jacking sleeve to move forward, the overturn deforming piece overturns in the same direction and has corresponding deformation under the dual action of the jacking sleeve and the circular conical surface of the bolt head, the effect of radial expansion is achieved, in this way, the overturn deforming piece is made to directly act on the inner side surface of the mounting hole, and the unilateral connection and fastening of a structural piece are achieved. According to the overturn deforming type unilateral bolt fastener, unilateral operation can be achieved, the connection and fastening of the structural piece can be completed, and good mechanical properties can be achieved.

Description

technical field [0001] The invention relates to a unilateral bolt fastener of a reversed form that can be used for unilateral installation in the connection and fastening operation of structural parts, and belongs to the technical fields of civil engineering and mechanical assembly. Background technique [0002] At present, in the field of civil construction and mechanical installation, there is a large demand for the installation of structural connection and fastening. As far as the currently commonly used bolts are concerned, when connecting and tightening components, workers need to work on both sides of the component at the same time, that is, insert bolts with nuts on one side, and then use tools to tighten the nuts on the other side. . This connection and fastening method is simple in structure, convenient in operation, and good in load bearing, but it is only suitable for open-section members. , it is impossible to use this common bolt-and-nut connection and tighten...

AI Technical Summary

Problems solved by technology

This connection and fastening method has simple structure, convenient operation and good load bearing, but it is only suitable for open cross-section members. In some special occasions, such as connecting and fastening closed cross-section members or members that are inconvenient to operate on the other side , it is impossible to use this commonly used bolt and nut connection fastening method

For example: in the steel pipe structure and the steel pipe concrete structure, at the joint of the beam column, because the steel pipe column is a closed section, it cannot be operated on both sides, and can only be connected and installed on one side, so this commonly used bolt and nut connection fastening method cannot be used For fast installation

At present, there is no corresponding unilateral bolt product in the domestic market, and the published related patents often weaken the bolt shank too much so that the mechanical properties are not ideal, or the installation is inconvenient; there are similar products in foreign markets, but they are expensive and difficult to obtain in the market. widely adopted in China

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