Double-layer steel bar sleeve

Abstract

The utility model discloses a double-layer reinforcing steel bar sleeve, which relates to the technical field of reinforcing steel bar sleeves, and adopts the technical scheme that the double-layer reinforcing steel bar sleeve comprises an inner sleeve and an outer sleeve, and the outer sleeve is movably arranged on the outer side of the inner sleeve; the inner sleeve comprises a straight sleeve part and an expansion part which is arranged at the middle section part of the straight sleeve part, the outer diameter of the expansion part is expanded relative to the straight sleeve part, and wedge-shaped surfaces which are matched with each other are arranged between the expansion part and the outer sleeve. According to the scheme, the double-layer structure of the inner sleeve and the outer sleeve is arranged, the outer sleeve can be utilized to movably extrude the inner sleeve, then the inner sleeve can exert a strong clamping effect on the steel bar connecting part, and therefore the high stability of connection is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of steel bar sleeves, in particular to a double-layer steel bar sleeve. Background Art

[0002] The rebar sleeve is a kit for connecting rebars, which is connected by sleeve-joining the two ends of the rebars to be connected. The existing rebar sleeve is connected to the rebar through the internal knurled pattern and the rolled straight thread processed on-site on the rebar, thereby achieving a stabilizing effect. However, this connection and fixing method is prone to relative misalignment and sliding between the joint and the inner wall of the sleeve due to the active bending of the rebar, which in turn causes the connection to gradually loosen, making it difficult to maintain overall stability.

[0003] In view of this, a design or technical improvement is now proposed to solve the above problems.

[0004] The above contents are only used to assist in understanding the technical solution of the present utility model, and do not constitute an admission that the above contents are the closest prior art. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned shortcomings and provide a double-layer steel bar sleeve.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A double-layer steel sleeve comprises an inner sleeve and an outer sleeve, wherein the outer sleeve is movably arranged outside the inner sleeve;

[0008] The inner sleeve comprises a straight tube portion and an expansion portion which is arranged in the middle section of the straight tube portion and has an outer diameter larger than that of the straight tube portion. A wedge-shaped surface which cooperates with the outer sleeve is arranged between the expansion portion and the outer sleeve.

[0009] Furthermore, the outer sleeve is stronger than the inner sleeve.

[0010] Furthermore, the outer sleeve includes a long sleeve and a short sleeve, and the long sleeve and the short sleeve are arranged on both sides of the inner sleeve in a wedge-shaped surface facing each other.

[0011] Furthermore, the straight tube portion is provided with an external thread, and the long tube and the short tube are provided with an internal thread matching the external thread.

[0012] Furthermore, the outer wall of the outer sleeve is hexagonal.

[0013] Furthermore, strip-shaped openings are evenly distributed on the expansion portion.

[0014] Furthermore, an anti-advance ring is also provided on the outer surface of the expansion portion, and the anti-advance ring deviates from the center position of the expansion portion.

[0015] Compared with the prior art, the beneficial effects of this solution are: this solution is provided with a double-layer structure of an inner sleeve and an outer sleeve, and the outer sleeve can be used to produce active extrusion on the inner sleeve, so that the inner sleeve can exert a strong clamping effect on the steel bar connection part, thereby ensuring the high stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 It is a schematic diagram of the installation between the utility model and the steel bar;

[0018] Figure 2 It is a three-dimensional schematic diagram of the utility model;

[0019] Figure 3 It is a schematic diagram of the structural disassembly of the utility model;

[0020] Figure 4 It is a cross-sectional stereoscopic schematic diagram of the utility model.

[0021] In the figure: 1, inner sleeve; 11, straight tube portion; 12, expansion portion; 13, wedge-shaped surface; 14, external thread; 2, outer sleeve; 21, long tube; 22, short tube; 23, internal thread; 3, strip-shaped orifice; 4, anti-entry ring. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] like Figure 1-4A double-layer steel bar sleeve shown in the figure comprises an inner sleeve 1 and an outer sleeve 2, wherein the outer sleeve 2 is movably arranged on the outside of the inner sleeve 1; the inner sleeve 1 comprises a straight cylinder portion 11 and an expansion portion 12 which is arranged in the middle section of the straight cylinder portion 11 and has an outer diameter enlarged relative to the straight cylinder portion 11, and a wedge surface 13 which cooperates with each other is arranged between the expansion portion 12 and the outer sleeve 2. The inner sleeve 1 is first connected to the steel bar connecting portion through the knurled surface arranged inside to increase friction, and then the outer sleeve 2 moves on the outer surface of the inner sleeve 1 to produce abutment against the wedge surface 13 on the expansion portion 12, thereby gradually squeezing the inner sleeve 1 inward to tighten during the movement, thereby further strengthening the connection effect with the steel bar.

[0024] In one embodiment, the strength of the outer sleeve 2 is greater than that of the inner sleeve 1. During the movement of the outer sleeve 2, it will generate a resistance force on the inner sleeve 1 through the wedge surface 13, thereby deforming and squeezing the inner sleeve 1 inward so that it is tightly clamped with the steel bar connection part. During the squeezing process, the inner sleeve 1 will be deformed to a certain extent by the action of the outer sleeve 2, so that the tightness between the inner sleeve and the steel bar is enhanced. At the same time, the outer sleeve 2 will not be deformed by the reverse force, causing the overall connection structure to be destroyed.

[0025] In one embodiment, the outer sleeve 2 includes a long tube 21 and a short tube 22, and the long tube 21 and the short tube 22 are arranged on both sides of the inner sleeve 1 with the wedge surfaces 13 facing each other. By arranging the long tube 21 and the short tube 22 of different lengths, the intersection point of the two will not be located in the middle part during the movable engagement with the expansion part 12, and then the contact surface with the end of the steel bar is dislocated so that it is not on the same plane, thereby better playing a tightening role.

[0026] In one embodiment, the straight tube portion 11 is further provided with an external thread 14, and the long tube 21 and the short tube 22 are provided with internal threads 23 adapted to the external thread 14. The long tube 21 and the short tube 22 are connected to the inner sleeve 1 through the internal threads 23, so that the two can move toward the central part of the inner sleeve 1 by rotation. At the same time, the external threads 14 arranged on both sides of the straight tube portion 11 rotate in opposite directions, so that the long tube 21 and the short tube 22 rotate in opposite directions on the inner sleeve 1 to balance the torque when rotating with each other, thereby facilitating the extrusion and tightening of the expansion portion 12 of the inner sleeve 1.

[0027] In one embodiment, the outer wall of the outer sleeve 2 is hexagonal, and the hexagonal setting enables the outer sleeve 2 to be adapted to a wrench, making it easier for workers to rotate the outer sleeve 2 and improving work efficiency.

[0028] In one embodiment, when the cross-section of the expansion portion 12 is a complete circle, the extrusion pressure on its outer wall caused by the rotation of the outer sleeve 2 will be relatively uniform, so that the movement of the outer sleeve 2 is too greatly hindered and it is difficult for it to tighten inward. Therefore, a strip hole 3 is provided on the expansion portion 12 to destroy the cross-sectional completeness of the expansion portion 12, so that the extrusion of the expansion portion 12 by the rotation of the outer sleeve 2 can better cause the expansion portion 12 to produce a certain deformation, so that its inner wall can fit tightly with the surface of the steel bar.

[0029] In one embodiment, a blocking ring 4 is further provided on the outer surface of the expansion portion 12, and the blocking ring 4 is offset from the center position of the expansion portion 12. In order to ensure that the meeting surface of the long tube 21 and the short tube 22 after rotation is not in the same plane as the steel bar contact surface, the blocking ring 4 is provided on the expansion portion 12. When the long tube 21 or the short tube 22 is rotated to the moving position, it will be blocked by the blocking ring 4 and stay there, thereby achieving the effect of misalignment of the meeting surface and the steel bar contact surface.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A double-layer steel sleeve, characterized in that: It comprises an inner sleeve (1) and an outer sleeve (2), wherein the outer sleeve (2) is movably arranged on the outside of the inner sleeve (1); The inner sleeve (1) comprises a straight tube portion (11) and an expansion portion (12) arranged in the middle section of the straight tube portion (11) and having an outer diameter enlarged relative to the straight tube portion (11); a wedge-shaped surface (13) that cooperates with the outer sleeve (2) is provided between the expansion portion (12) and the outer sleeve (2).

2. The double-layer steel bar sleeve according to claim 1, characterized in that: The outer sleeve (2) is stronger than the inner sleeve (1).

3. The double-layer steel sleeve according to any one of claims 1 or 2, characterized in that: The outer sleeve (2) comprises a long sleeve (21) and a short sleeve (22), and the long sleeve (21) and the short sleeve (22) are arranged on both sides of the inner sleeve (1) in a manner that the wedge surfaces (13) face each other.

4. The double-layer steel bar sleeve according to claim 3 is characterized in that: The straight tube portion (11) is also provided with an external thread (14), and the long tube (21) and the short tube (22) are provided with an internal thread (23) adapted to the external thread (14).

5. The double-layer steel bar sleeve according to claim 4, characterized in that: The outer wall of the outer sleeve (2) is hexagonal.

6. The double-layer steel sleeve according to claim 1, characterized in that: The expansion portion (12) is also evenly provided with strip-shaped openings (3).

7. The double-layer steel bar sleeve according to claim 3 is characterized in that: The outer surface of the expansion portion (12) is also provided with an anti-entry ring (4), and the anti-entry ring (4) is offset from the center position of the expansion portion (12).

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