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CN-224229042-U - Saw tooth expansion bolt

CN224229042UCN 224229042 UCN224229042 UCN 224229042UCN-224229042-U

Abstract

The utility model relates to the technical field of building fasteners and provides a sawtooth expansion bolt which comprises an expansion pipe, wherein a head expansion structure and a middle expansion structure which can be opened in two directions are arranged around the expansion pipe, sawteeth which are bent outwards are distributed on two sides of the head expansion structure, the top of the head expansion structure is provided with a guide surface which is bent outwards, the head expansion structure is fixedly connected with an upper circular pipe through a first bending which is downward-sinking of the expansion surface, the upper circular pipe is fixedly connected with the middle expansion structure through a second bending which is upward-sinking of the expansion surface, a lower circular pipe is arranged on the lower side of the middle expansion structure, and the middle expansion structure is fixedly connected with the lower circular pipe through an inward V-shaped bending. Through the action of the composite expansion mechanism, the tensile strength can be improved, and the displacement in vibration test can be reduced.

Inventors

  • QIN RUIFENG

Assignees

  • 秦睿锋

Dates

Publication Date
20260512
Application Date
20250604

Claims (5)

  1. 1. The utility model provides a sawtooth expansion bolt, its characterized in that, includes expansion pipe (1), expansion pipe (1) are equipped with head expansion structure (7) and middle part expansion structure (5) that can two-wayly open all around, head expansion structure (7) both sides distribution has outwards to buckle sawtooth (2), head expansion structure (7) top has outwards to buckle guide surface (8), head expansion structure (7) are through expansion face down subside first bending (3) and upper portion pipe (10) fixed connection, upper portion pipe (10) are through expansion face upward subside second bending (4) and middle part expansion structure (5) fixed connection, middle part expansion structure (5) downside is equipped with lower part pipe (9), through inwards third bending (6) fixed connection between middle part expansion structure (5) and lower part pipe (9).
  2. 2. The saw-tooth expansion bolt according to claim 1, wherein the center of the expansion pipe (1) is penetrated with a conical screw column body (14), a gasket (11) is arranged on the lower side of the expansion pipe (1), a spring pad (12) is arranged on the lower side of the gasket (11), a nut (13) is arranged on the lower side of the spring pad (12), the expansion pipe (1), the gasket (11) and the spring pad (12) are sequentially sleeved on the outer wall of the conical screw column body (14), and the nut (13) is arranged at the rear end of the conical screw column body (14).
  3. 3. Saw-tooth expansion bolt according to claim 2, characterized in that the saw-tooth (2) is symmetrically distributed on both sides of the head expansion structure (7), and the bending angle between the saw-tooth (2) and the head expansion structure (7) is 45 °.
  4. 4. A serration expansion bolt according to claim 1, characterized in that the angle of the outward bending of the guide surface (8) is 45 °.
  5. 5. Saw tooth expansion bolt according to claim 2 or 4, characterized in that the third bend (6) is V-shaped.

Description

Saw tooth expansion bolt Technical Field The utility model relates to the technical field of building fasteners, in particular to an expansion bolt with a sawtooth structure, which is suitable for anchoring brittle materials such as concrete, red bricks, porous bricks, aerated blocks, stones and the like. Background The conventional expansion bolt has the defects that a plurality of gaps are formed in a common red brick, a hollow brick, a porous brick and an aerated block wall, the conventional expansion bolt cannot effectively provide tensile force in the holes with the gaps, the conventional expansion bolt depends on friction expansion and is easy to loosen in a vibration environment, the biting force of a smooth bolt body and a base material is insufficient, and the tensile pulling performance is limited by the strength of an expansion sheet. The existing improvement scheme has the defects that the holes with gaps cannot provide effective tension, the strength of the air block base material is insufficient, the threaded expansion bolts easily cause stress concentration cracking of the base material, the construction of the chemical anchor bolts is complex, and the curing time is long. Disclosure of Invention The utility model aims to provide an expansion bolt with a sawtooth structure, which is used for overcoming the problems in the prior art. In order to achieve the above object, the present utility model provides the following technical solutions: The utility model provides a sawtooth expansion bolt, which comprises an expansion pipe, wherein a head expansion structure and a middle expansion structure which can be opened in two directions are arranged around the expansion pipe, sawteeth which are bent outwards are distributed on two sides of the head expansion structure, the top of the head expansion structure is provided with a guide surface which is bent outwards, the head expansion structure is fixedly connected with an upper circular pipe through a first bending which is downward settled through the expansion surface, the upper circular pipe is fixedly connected with the middle expansion structure through a second bending which is upward settled through the expansion surface, a lower circular pipe is arranged on the lower side of the middle expansion structure, and the middle expansion structure is fixedly connected with the lower circular pipe through a third inward bending. Further, the conical screw column is penetrated in the center of the expansion pipe, a gasket is arranged on the lower side of the expansion pipe, a spring pad is arranged on the lower side of the gasket, a nut is arranged on the lower side of the spring pad, the expansion pipe, the gasket and the spring pad are sequentially sleeved on the outer wall of the conical screw column, and the nut is arranged at the rear end of the conical screw column. Further, the saw teeth are symmetrically distributed on two sides of the head expansion structure, and the bending angle between the saw teeth and the head expansion structure is 45 degrees. Further, the angle at which the guide surface is bent outward is 45 °. Further, the third bend is V-shaped. The beneficial effects are that: According to the saw-tooth expansion bolt provided by the utility model, the 45-degree bending of the head part of the expansion pipe provides expansion conditions, the surface of the expansion pipe is provided with the axial saw-tooth structure, the head expansion structure with saw teeth and the middle expansion structure are inwards settled through bending to adapt to the diameter of a hole, the angle between the saw teeth and the section of the pipe is 45 degrees, the angle between the saw teeth and the section of the pipe is 90 degrees, and the tooth height is 0.8mm. Under the action of the composite expansion mechanism, the conical bolt drives the upper part to open towards the head, and the bolt pressure is conducted to the middle bending part to enable the middle expansion structure to open towards the tail, so that a front-back anchoring effect is formed. Compared with the common expansion bolt with the same specification, the tensile strength is improved by more than 40 percent, and the displacement in the vibration test is reduced by 60 percent. Drawings In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art. FIG. 1 is a schematic view of the overall structure of a serration expansion bolt of the present utility model; fig. 2 is a schematic view of the overall structure of the serration expansion bolt of th