Drill tail bolt for steel structure connection

Abstract

The utility model discloses a drilling tail bolt for steel structure connection, which comprises a bolt head, a first rod body, a second rod body, a third rod body and a drilling tail part, the bottom of the bolt head is connected with the first rod body, the bottom of the first rod body is connected with the second rod body, the bolt head, the first rod body and the second rod body are of an integrated structure, the outer wall of the first rod body is provided with a first external thread, and the outer wall of the third rod body is provided with a second external thread. A first external thread is arranged on the outer wall of the first rod body, a second external thread is arranged on the outer wall of the second rod body, a threaded hole is formed in one end of the third rod body and matched with the second external thread, the second rod body is screwed into the threaded hole, the other end of the third rod body is connected with a drill tail part, and the third rod body and the drill tail part are of an integrated structure. According to the self-drilling bolt, the second rod body and the third rod body are connected through the threaded hole, so that a combined body of the third rod body and the drill tail part can be taken out after the self-drilling bolt is installed, then a nut can be screwed on the second rod body, the self-drilling bolt is not prone to loosening in the later use process, and the connection reliability of the self-drilling bolt is effectively guaranteed.

Description

[Technical field]

[0001] The utility model relates to the technical field of fasteners, in particular to the technical field of self-drilling bolts. [Background technology]

[0002] Some steel structures used in house construction often use drill bolts as connecting fasteners, and the drill bolts used in current buildings are mainly used to fix steel structures or to fix thin plates in simple buildings. Existing drill bolts cannot be installed with nuts after being screwed on steel structures. After long-term use, the bolts are prone to loosening, which will have a certain impact on the connection reliability of the steel structure and also pose installation risks. [Contents of the utility model]

[0003] The utility model aims to solve the problems in the prior art and provides a self-drilling bolt for connecting steel structures, which can enable the self-drilling bolt to be installed with a nut after being tightened, thereby improving the connection reliability of the self-drilling bolt.

[0004] To achieve the above-mentioned purpose, the utility model proposes a drill bolt for connecting steel structures, comprising a bolt head, a first rod body, a second rod body, a third rod body, and a drill tail portion, wherein the bottom of the bolt head is connected to the first rod body, the bottom of the first rod body is connected to the second rod body, the bolt head, the first rod body, and the second rod body are an integrated structure, a first external thread is provided on the outer wall of the first rod body, a second external thread is provided on the outer wall of the second rod body, a threaded hole is provided at one end of the third rod body, the threaded hole is adapted to the second external thread, the second rod body is screwed into the threaded hole, the other end of the third rod body is connected to the drill tail portion, and the third rod body and the drill tail portion are an integrated structure.

[0005] Preferably, the first external thread and the second external thread have the same spiral direction.

[0006] Preferably, the second rod body is provided with a nut, which is screwed onto the second rod body separated from the threaded hole, and a clamping ring is provided near the bolt head end of the nut, and the inner diameter of the clamping ring is larger than the major diameter of the first rod body.

[0007] Preferably, a third external thread is provided on the outer wall of the third rod, the minor diameter of the third rod is equal to the minor diameter of the first rod, the major diameter of the third rod is smaller than the major diameter of the first rod, and the pitch of the third external thread is smaller than the pitch of the first rod.

[0008] The beneficial effects of the utility model are as follows: the utility model connects the second rod body and the third rod body through a threaded hole, so that after the installation of the drill tail bolt is completed, the combination of the third rod body and the drill tail part can be taken out, and then the nut can be screwed on the second rod body, so that the drill tail bolt is not easy to loosen during later use, and its connection reliability is effectively guaranteed.

[0009] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0010] Figure 1 This is a front view of the utility model of a self-drilling bolt for connecting steel structures;

[0011] Figure 2 The utility model is a front view of a self-drilling bolt for connecting steel structures after a nut is installed.

[0012] In the figure: 1-bolt head, 2-first rod body, 3-second rod body, 4-third rod body, 5-drill tail, 6-nut, 20-first external thread, 30-second external thread, 40-third external thread, 41-threaded hole, 60-tightening ring. [Specific implementation method]

[0013] Embodiment 1:

[0014] See also Figure 1 The utility model discloses a drill bolt for connecting steel structures, comprising a bolt head 1, a first rod body 2, a second rod body 3, a third rod body 4, and a drill tail portion 5. The bottom of the bolt head 1 is connected to the first rod body 2, and the bottom of the first rod body 2 is connected to the second rod body 3. The bolt head 1, the first rod body 2, and the second rod body 3 are an integrated structure. The outer wall of the first rod body 2 is provided with a first external thread 20, and the outer wall of the second rod body 3 is provided with a second external thread 30. One end of the third rod body 4 is provided with a threaded hole 41, and the threaded hole 41 is adapted to the second external thread 30. The second rod body 3 is screwed into the threaded hole 41. The other end of the third rod body 4 is connected to the drill tail portion 5. The third rod body 4 and the drill tail portion 5 are an integrated structure.

[0015] The first external thread 20 and the second external thread 30 have the same spiral direction.

[0016] Embodiment 2:

[0017] In order to make it easier to drill and tighten the drill bolt, a third external thread 40 is provided on the outer wall of the third rod body 4, the minor diameter of the third rod body 4 is equal to the minor diameter of the first rod body 2, the major diameter of the third rod body 4 is smaller than the major diameter of the first rod body 2, and the pitch of the third external thread 40 is smaller than the pitch of the first rod body 2.

[0018] Embodiment three:

[0019] See also Figure 2 The second rod body 3 is provided with a nut 6, which is screwed onto the second rod body 3 separated from the threaded hole 41, and a clamping ring 60 is provided at the end of the nut 6 close to the bolt head 1, and the inner diameter of the clamping ring 60 is larger than the major diameter of the first rod body 2.

[0020] Working process of this utility model:

[0021] During the working process of the drill bolt for connecting steel structures of the utility model, after tightening the drill bolt, screw off the combination of the third rod body 4 and the drill tail portion 5, and then screw the nut 6 on the second rod body 3. When screwing the nut 6, it is necessary to ensure that the tightening ring 60 faces the bolt head, and then tighten the nut 6. Due to the existence of the nut 6, the drill bolt is not easy to loosen, and the connection reliability can be effectively guaranteed.

[0022] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. Drill bolts for steel structure connection, characterized by: The invention comprises a bolt head (1), a first rod body (2), a second rod body (3), a third rod body (4) and a drill tail portion (5); the bottom of the bolt head (1) is connected to the first rod body (2); the bottom of the first rod body (2) is connected to the second rod body (3); the bolt head (1), the first rod body (2) and the second rod body (3) are an integrated structure; the outer wall of the first rod body (2) is provided with a first external thread (20); the outer wall of the second rod body (3) is provided with a second external thread (30); one end of the third rod body (4) is provided with a threaded hole (41); the threaded hole (41) is adapted to the second external thread (30); the second rod body (3) is screwed into the threaded hole (41); the other end of the third rod body (4) is connected to the drill tail portion (5); the third rod body (4) and the drill tail portion (5) are an integrated structure.

2. The self-drilling bolt for connecting steel structures according to claim 1, characterized in that: The spiral directions of the first external thread (20) and the second external thread (30) are the same.

3. The drill bolt for connecting steel structures according to claim 1, characterized in that: The second rod body (3) is provided with a nut (6), which is screwed onto the second rod body (3) separated from the threaded hole (41), and a clamping ring (60) is provided at the end of the nut (6) close to the bolt head (1), wherein the inner diameter of the clamping ring (60) is greater than the major diameter of the first rod body (2).

4. The self-drilling bolt for connecting steel structures according to claim 1, characterized in that: A third external thread (40) is provided on the outer wall of the third rod body (4); the minor diameter of the third rod body (4) is equal to the minor diameter of the first rod body (2); the major diameter of the third rod body (4) is smaller than the major diameter of the first rod body (2); and the pitch of the third external thread (40) is smaller than the pitch of the first rod body (2).

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