Inverted conical screw rod for anchor bolt

Abstract

The utility model relates to the technical field of anchoring, in particular to an inverted conical screw rod for an anchor bolt, which comprises a rod head, a rod body and a rod tail which are connected into a whole, the rod head comprises a plurality of reducing sections which are sequentially connected, each reducing section sequentially comprises a first conical surface, a second conical surface and a transition surface from top to bottom, the first conical surface is gradually narrowed from top to bottom, and the second conical surface is gradually narrowed from top to bottom. The second conical surface is gradually expanded from top to bottom, the transition surface is the outer side face of a cylindrical structure, a vertically-through spiral groove is formed in the transition surface, and the spiral groove extends upwards to be formed in the second conical surface. The maximum-diameter position in the rod head reducing section is the transition face, and the spiral groove is formed in the transition face, so that particles in the mounting hole can enter the spiral groove and cannot be accumulated in the process that the inverted-cone-shaped screw rod is rotationally inserted into the mounting hole. And meanwhile, the spiral groove is further provided with an extension section on the second conical surface, particles in the mounting hole cannot be accumulated at the maximum-diameter position in the variable-diameter section of the rod head, it is ensured that the maximum contact area exists between anchoring glue and a transition surface, and therefore the anchoring stability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of anchoring, in particular to an inverted conical screw rod for an anchor bolt. Background Art

[0002] The existing inverted conical screw, due to its inverted conical structure, is easily accumulated and stuck on the transition surface during the process of being rotated and inserted into the mounting hole, resulting in the inverted conical screw being unable to rotate smoothly, or the inverted conical screw being incompletely inserted, or the anchoring glue pre-injected into the mounting hole during the insertion process being unable to completely solidify with the inverted conical screw under the influence of the particles, which can easily cause the anchor bolt to fall off after long-term use, affecting the structure. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, an inverted conical screw rod for an anchor bolt is provided.

[0004] The utility model solves the technical problem by adopting a technical solution: an inverted conical screw rod for an anchor bolt, comprising a rod head, a rod body and a rod tail connected as one body.

[0005] The rod head comprises several sections of variable diameter sections connected in sequence, each section of the variable diameter section comprises a first conical surface, a second conical surface and a transition surface from top to bottom, the first conical surface gradually narrows from top to bottom, the second conical surface gradually expands from top to bottom, the transition surface is the outer side surface of the cylindrical structure, the upper end surface diameter of the truncated cone structure corresponding to the first conical surface is D1, the lower end surface diameter is D2, and the height is H1, the upper end surface diameter of the truncated cone structure corresponding to the second conical surface is D2, the lower end surface diameter is D3, and the height is H2, the end surface diameter of the cylindrical structure corresponding to the transition surface is D3, and the height is H3, wherein D3>D1>D2, H2>8H1>8H3, thereby ensuring the height of the second conical surface and increasing the contact area between the anchoring glue and the second conical surface.

[0006] The transition surface is provided with a spiral groove that runs through from top to bottom, and the spiral groove extends upward to the second conical surface. The transition surface is where the largest diameter is in the diameter-changing section of the rod head. The spiral groove is provided on the transition surface so that when the inverted conical screw is rotated and inserted into the mounting hole, particles in the mounting hole can enter the spiral groove without accumulation. At the same time, the spiral groove also has an extension section on the second conical surface, so that particles in the mounting hole will not accumulate at the largest diameter in the diameter-changing section of the rod head, ensuring the maximum contact area between the anchoring glue and the transition surface, thereby ensuring the stability of the anchoring.

[0007] Furthermore, a circle of threaded protrusions is provided at the middle section of the second conical surface and at one end close to the transition surface. The two circles of threaded protrusions increase the friction between the second conical surface and the anchoring glue, thereby improving the pull-out force of the anchor bolt.

[0008] Furthermore, the rod body is provided with a sawtooth groove to increase the contact area between the rod body and the anchoring glue and improve the stability of the anchoring.

[0009] Furthermore, the rod tail is provided with an external thread.

[0010] The beneficial effects of the utility model are as follows: the part with the largest diameter in the diameter-reducing section of the rod head is the transition surface, and a spiral groove is arranged on the transition surface, so that when the inverted conical screw is rotated and inserted into the mounting hole, particles in the mounting hole can enter the spiral groove without accumulation; at the same time, the spiral groove also has an extension section on the second conical surface, and particles in the mounting hole will not accumulate at the part with the largest diameter in the diameter-reducing section of the rod head, thereby ensuring the maximum contact area between the anchoring glue and the transition surface, thereby ensuring the stability of the anchoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle.

[0014] Numbers in the figure: 1-rod head, 11-first conical surface, 12-transition surface, 13-second conical surface, 14-spiral groove, 15-threaded protrusion, 2-rod body, 21-serrated groove, 3-rod tail. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] Figure 1 and Figure 2 The inverted conical screw rod for anchor bolts shown in the figure comprises a rod head 1, a rod body 2 and a rod tail 3 which are connected as one body.

[0017] The rod head 1 includes several sections of variable diameter sections connected in sequence, each of which includes a first conical surface 11, a second conical surface 13 and a transition surface 12 from top to bottom. The first conical surface 11 gradually narrows from top to bottom, and the second conical surface 13 gradually expands from top to bottom. The transition surface 12 is the outer side surface of a cylindrical structure. The upper end surface diameter of the truncated cone structure corresponding to the first conical surface 11 is D1, the lower end surface diameter is D2, and the height is H1. The upper end surface diameter of the truncated cone structure corresponding to the second conical surface 13 is D2, the lower end surface diameter is D3, and the height is H2. The end surface diameter of the cylindrical structure corresponding to the transition surface 12 is D3 and the height is H3, wherein D3>D1>D2, H2>8H1>8H3, thereby ensuring the height of the second conical surface 13 and increasing the contact area between the anchoring glue and the second conical surface 13.

[0018] The transition surface 12 is provided with a spiral groove 14 that passes through from top to bottom, and the spiral groove 14 extends upward to the second cone surface 13. The transition surface 12 is the largest diameter part in the diameter-changing section of the rod head 1. The spiral groove 14 is provided on the transition surface 12, so that when the inverted conical screw is rotated and inserted into the mounting hole, the particles in the mounting hole can enter the spiral groove 14 without accumulation; at the same time, the spiral groove 14 also has an extension section on the second cone surface 13, and the particles in the mounting hole will not accumulate at the largest diameter part in the diameter-changing section of the rod head 1, ensuring that there is a maximum contact area between the anchoring glue and the transition surface 12, thereby ensuring the stability of the anchoring.

[0019] A circle of threaded protrusion 15 is provided at the middle section of the second conical surface 13 and at one end close to the transition surface 12 .

[0020] The rod body 2 is provided with a sawtooth groove 21 to increase the contact area between the rod body 2 and the anchoring glue and improve the stability of anchoring. The rod tail 3 is provided with an external thread.

[0021] During assembly, after drilling a hole in the solid masonry, use a 2-blow 2-brush 2-blow operation to remove particles in the installation hole, then inject a certain amount of anchoring glue into the installation hole, and then rotate and insert the inverted tapered screw for the anchor bolt. After the anchoring glue is cured, fix the load on the rod tail 3 at the outer end and tighten the nut.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An inverted tapered screw for an anchor bolt, characterized in that: It comprises a rod head (1), a rod body (2) and a rod tail (3) which are connected as one body. The club head (1) comprises a plurality of diameter-reducing sections connected in sequence, each diameter-reducing section comprising, from top to bottom, a first conical surface (11), a second conical surface (13) and a transition surface (12), the first conical surface (11) gradually narrows from top to bottom, the second conical surface (13) gradually expands from top to bottom, the transition surface (12) is the outer side surface of a cylindrical structure, the upper end surface diameter of the truncated cone structure corresponding to the first conical surface (11) is D1, the lower end surface diameter is D2, and the height is H1, the upper end surface diameter of the truncated cone structure corresponding to the second conical surface (13) is D2, the lower end surface diameter is D3, and the height is H2, the end surface diameter of the cylindrical structure corresponding to the transition surface (12) is D3, and the height is H3, wherein D3>D1>D2, H2>8H1>8H3, The transition surface (12) is provided with a spiral groove (14) which passes through from top to bottom, and the spiral groove (14) extends upward to the second conical surface (13).

2. The inverted tapered screw for anchor bolt according to claim 1, characterized in that: A circle of threaded protrusions (15) is provided at the middle section of the second conical surface (13) and at one end close to the transition surface (12).

3. The inverted tapered screw for anchor bolt according to claim 1, characterized in that: The rod body (2) is provided with a sawtooth groove (21).

4. The inverted tapered screw for anchor bolt according to claim 1, characterized in that: The rod tail (3) is provided with an external thread.

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