A back bolt and connection structure

Abstract

The invention provides a back bolt and a connection structure, including an anchor rod and an expansion element. The expansion element has a cylindrical main body and a plurality of expansion parts at one end of the cylindrical main body. The outer diameter of the expansion part is consistent with the outer diameter of the cylindrical main body. , the expansion part is also provided with a protruding part, and the protruding part is used as a force-bearing part to cooperate with the cone part of the bottom expansion hole of the plate after the expansion part is expanded; a plurality of expansion parts at one end of the cylindrical main body are surrounded by The inner side of the dilated section forms a thinned area for easy expansion and bending. The invention has a good matching degree between the back bolt and the bottom expansion hole, and the anti-rotation limit measure does not affect the cooperation between the back bolt and the bottom expansion hole, and can always maintain this good matching state, realizing the integral permanent connection , the stress of the expansion part can be reduced to a minimum or even no stress; the invention realizes a connection structure that never loosens, can resist strong earthquakes, and subway start-stop shocks, and does not need to be reinforced by welding.

Description

technical field [0001] The invention relates to a back bolt, which is used for the decoration of dry-hanging boards of various buildings. It is anchored and connected through the back of the board, so it is called "back bolt". It is especially suitable for the use of dry-hanging curtain walls such as subway stations, ceramic plates, glass-ceramics, etc., and can also be used in other building structure connection fields. The invention also relates to connection structures utilizing such back bolts. Background technique [0002] At present, the cone screw load-bearing back bolts used in the curtain wall of the building envelope mainly consist of three types: "one-piece cylindrical expansion ring, disc-shaped expansion element, and disc-shaped set point force-bearing expansion element". [0003] The first type adopts the conjoined cylindrical expansion type. Although the market share ranks first, it has the function of the flexible layer to balance the force on the four expan...

AI Technical Summary

Problems solved by technology

[0003] The first type adopts the conjoined cylindrical expansion type. Although the market share ranks first, it has the function of the flexible layer to balance the force on the four expansion expansion elements. However, the anatomical study of its slices shows that its defects are reflected in the expansion. The degree of coincidence between the protruding arcs of the four expansion elements and the conical surface of the bottom expansion hole of the plate is only 40-50%; and because the outer diameter of the expansion section is smaller than the outer diameter of the conjoined cylinder, the protruding arcs of the four expansion elements will be under load. When the negative wind pressure tensile force and the suspension tensile force are relatively large, the side recess whose outer diameter of the expansion section is smaller than the outer diameter of the conjoined cylinder bends toward the hole wall, so that the protruding arc surface pulls and slides out of the conical surface of the expanded bottom hole of the plate Possibly; there is also a very high manufacturing cost of the one-piece cylindrical expansion part, which is complicated in technology. It needs to use stainless steel seamless pipes that are 1.6 times more expensive than stainless steel wire rods. It is completed through complicated cutting and processing, and the waste of materials is also quite serious. Larger areas for further improvement

[0004] The second type uses a disc-shaped expansion element, which is stamped from a stainless steel plate. After expansion, it is in a sheet shape and cannot match the conical surface of the bottom expansion hole of the plate. In addition, the cross-section of the metal expansion element is not compatible with the brittle stone and porcelain plate. Direct load bearing, especially high brittle porcelain plates, glass-ceramics, glass, etc. are more insufficient

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