High-safety undercutting anchor bolt and connecting structure of building appurtenance

Abstract

The invention provides a high-safety undercutting anchor bolt and a connecting structure thereof. The undercutting anchor bolt comprises a fastening sleeve, and a metal anchor rod of the undercutting anchor bolt is provided with an anti-loose anchoring section. Under the action of a tool, the fastening sleeve tightly presses a connected part, an inner hole of the fastening sleeve shrinks to tightly wrap the anti-loose anchoring section, an concave-convex inner hole surface matching with an anti-loose stripe on the surface of the anti-loose anchoring section is formed, and accordingly permanent connection without welding is formed. A sleeve and an expansion component are two split independent elements, the sleeve of the undercutting anchor bolt is a plastic part, and one or multiple axial grooves are formed in the middle and the front of the outer wall of the sleeve. The undercutting anchor bolt has the advantages that permanent firm connection can be realized without welding, loosening is prevented, connection strength is improved greatly, anti-seismic requirements are met, and labor and cost can be saved; flexible anti-seismic measures are applied, so that anti-seismic performance is improved; by the aid of radial deformability of the sleeve and avoidance of the axial grooves, local bends in holes are penetrated to realize reliable connection, and cost is saved as reperforating is avoided.

Description

technical field [0001] The invention relates to a bottom-cut rivet and a connection structure of building accessories using the bottom-cut rivet. It is mainly suitable for construction of various buildings, subways, etc., and is more suitable for the use of curtain walls of building envelopes with high requirements for anti-vibration and fire protection. Background technique [0002] At present, the anchor bolts used in the installation of building auxiliary structures are affected by external forces such as hundreds of thousands of wind waves every year or braking shock vibration during subway operation, thermal expansion and contraction, etc., which will cause the anchors to loosen and the gap between the connecting holes to sag. cause an accident. Therefore, in order to prevent the bolts from loosening and the gap between the connecting holes from sagging, the national regulations require that the screw, gasket, nut and the connecting anchor plate be welded to death. How...

AI Technical Summary

Problems solved by technology

[0002] At present, the anchor bolts used in the installation of building auxiliary structures are affected by external forces such as hundreds of thousands of wind waves every year or braking shock vibration during subway operation, thermal expansion and contraction, etc., which will cause the anchors to loosen and the gap between the connecting holes to sag. cause an accident

Therefore, in order to prevent the bolts from loosening and the gap between the connecting holes from sagging, the national regulations require that the screw, gasket, nut and the connecting anchor plate be welded to death. However, this welding on the construction site is not only difficult, but also exists Potential safety hazards of desoldering caused by welding on several different materials

[0003] Moreover, in the operation of subway trains, under the shock and vibration of high-speed operation and braking, the anchor bolt steel sleeve will form an impact on the concrete hole wall. Under the long-term action, the hole wall will become larger and the anchor bolt Rod begins to slide affecting expansion capacity

Moreover, with the emergence of a large number of high-rises and super-high-rises, when anchor bolts are set in densely reinforced areas of concrete structures or on dense areas, there will often be curved holes that are not visible to the naked eye when they hit the steel bars. When the cylinder was installed halfway in, it was found that it was stuck and could not be reinstalled; if the construction was carried out normally, the holes were re-drilled due to the selected position, but in this way, the several matching holes and the fasteners installed before were all invalid Therefore, in many projects, the construction personnel drilled the holes of the anchor steel plate and then cut off and welded them, leaving a safety hazard for the project.

[0004] In addition, for anchor bolts used on concrete and other substrates, the fit between the conical surface of the expansion head on the anchor bolt rod and the inner circle of the expansion sheet is unreasonable. Slowly fatigue and match, so that the anchor bolt rod is displaced outward by about several millimeters, the anchor bolt is loose, the connecting piece and the anchor rod will wear out under the action of external force vibration, and the nut is affected by the dynamic force. Loosen, there is a safety hazard accident happened

Another way is the inverted cone anchor bolt. Its expansion sheet is reversely expanded and stuck on the concrete, but it seems firm and will not slip out. The piece will be slowly chiseled into the concrete like a blade, so that the anchor rod will be displaced outward by about a few millimeters. If there is no high-strength stone in the surrounding area, the growth will be greater, and the anchor will become loose.

[0005] In addition, when these anchors are installed upside down on concrete, it is difficult for the installer to control the anchors, and the sleeves are easy to fall off

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