A steel reinforcement connection structure using implanted compression

Abstract

This utility model provides a steel bar connection structure using implanted extrusion, belonging to the field of building structure engineering technology. It includes a sleeve; two steel bars inserted into both ends of the sleeve, with a cavity formed by the gap between the ends of the two steel bars inside the sleeve; the cavity is filled with structural adhesive; the outer wall of the sleeve has radially extruded indentations; the deformation of the indentations drives the inner wall of the sleeve to contract towards the cavity, thereby squeezing the structural adhesive to flow and fill the gaps inside the cavity; this utility model, through the combined action of mechanical interlocking and structural adhesive filling, improves the connection strength between the steel bars and the sleeve by filling the cracks and gaps caused by extrusion, as well as the gaps between the steel bars and the sleeve, thereby enhancing the reliability, durability, and stability of the connection.

Description

Technical Field

[0001] This utility model relates to the field of building structure engineering technology, and specifically to a steel bar connection structure using implanted extrusion. Background Technology

[0002] In concrete structure engineering, rebar connection is a crucial step in ensuring the overall strength and stability of the structure, directly affecting the safety and durability of the project. Currently, cold extrusion sleeve connection technology for rebars has become one of the most widely used rebar connection methods in the industry due to its relatively convenient operation and wide applicability.

[0003] The core principle of this traditional technology is as follows: a cold extrusion press is used to radially compress a sleeve fitted onto the ends of two reinforcing bars to be connected, creating an indentation on the outer wall of the sleeve. The compressive force forces the inner wall of the sleeve to fit tightly against the surface of the reinforcing bars. The connection is achieved through the mechanical interlocking force between the sleeve and the reinforcing bars (especially the interlocking action between the crescent-shaped grooves on the surface of the threaded reinforcing bar and the inner wall of the sleeve after compression deformation). Under ideal working conditions, this connection method can meet basic mechanical performance requirements.

[0004] However, in actual construction, the connection between the rebar and the sleeve is achieved solely through mechanical interlocking, leaving an unfilled cavity. During the compression process, localized stress concentration can easily lead to micro-cracks in the sleeve. Since the rebar and sleeve cannot be disassembled after insertion, these cracks are difficult to detect through routine inspections. Over long-term use, they will continue to expand with accumulated stress, directly weakening the tensile strength of the connection joint. Therefore, relying solely on mechanical interlocking is insufficient to guarantee the stability of the connection, significantly reducing the reliability and durability of the rebar-sleeve connection. Utility Model Content

[0005] In view of this, the present invention provides a steel bar connection structure using implanted extrusion, which can fill and repair the cracks and gaps caused by extrusion, as well as the gaps between the steel bar and the sleeve, by using structural adhesive to fill and repair the cracks and gaps caused by extrusion. Thus, the tensile strength, fatigue wear resistance and overall stability of the steel bar connection are significantly improved by the synergistic effect of the adhesive performance and mechanical interlocking force of the structural adhesive, effectively avoiding the problems of loose connection or insufficient strength, and greatly enhancing the reliability and durability of the connection.

[0006] To solve the above-mentioned technical problems, this utility model provides a rebar connection structure using implanted compression, including a sleeve; and two rebars inserted into both ends of the sleeve, with the rebars and sleeve being used in pairs. The gap between the ends of the two rebars located inside the sleeve forms a cavity; the cavity is filled with structural adhesive. After the rebars and sleeve are inserted, an external cold press is used to compress the axial outer wall of the sleeve, causing radially inward indentations to form on the outer wall of the sleeve due to compression. This results in localized protrusions on the inner wall of the sleeve. These protrusions compress the structural adhesive in the cavity, causing the adhesive to flow and fill the gaps between the rebars and the inner wall of the sleeve, as well as the cracks in the cavity. The protrusions also compress the rebars to achieve mechanical interlocking. The combination of mechanical interlocking and structural adhesive filling improves the connection strength between the rebars and the sleeve, enhancing the reliability, durability, and stability of the rebar-sleeve connection.

[0007] The structural adhesive uses high-performance silicone structural adhesives commonly used in building structures. It has excellent bonding strength, weather resistance and flowability. During the sleeve extrusion process, it can fully fill the gaps as the sleeve deforms and form an elastic adhesive layer after curing. It has both bonding and buffering functions, improving the long-term reliability of the connection.

[0008] Both reinforcing bars are ribbed steel bars of the same diameter. The transverse ribs on their surfaces can be squeezed against the inner wall of the sleeve to form a mechanical interlock, preventing slippage and improving the stability and safety of the connection.

[0009] The indentation arc structure is formed by radial extrusion using an arc mold. The arc design makes the sleeve more evenly stressed, and the arc indentation fits better with the curved ribs of the ribbed steel bar, enhancing the mechanical interlocking effect.

[0010] There are multiple indentations, and these indentations are evenly distributed along the axial direction of the steel sleeve. By pressing at equal intervals, the sleeve is subjected to uniform force in the axial direction, and the structural adhesive is evenly pushed to each gap, avoiding insufficient local filling and improving the overall tensile and shear resistance.

[0011] Positioning marks are provided on the circumferential surfaces of the two reinforcing bars. These positioning marks can be high-visibility paint, which is applied to the designated positions on the circumferential surfaces of the reinforcing bars to maintain the axial distance between the positioning marks and the insertion ends of the reinforcing bars at the specified insertion depth. After the two reinforcing bars are inserted into the sleeve, the outer edge of the positioning marks is flush with the end face of the sleeve port to avoid insufficient or excessive insertion depth of the reinforcing bars.

[0012] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0013] 1. When this utility model is used, structural adhesive can be used to fill and repair cracks and gaps caused by extrusion, as well as gaps between steel bars and sleeves. Thus, the tensile strength, fatigue wear resistance and overall stability of the steel bar connection are significantly improved by the synergistic effect of the adhesive performance and mechanical interlocking force of the structural adhesive. This effectively avoids the problem of loose connection or insufficient strength, and greatly enhances the reliability and durability of the connection.

[0014] 2. When this utility model is used, the evenly spaced indentations ensure that the sleeve is subjected to balanced axial force, preventing the sleeve from being damaged due to excessive local compression; the structural adhesive is filled more evenly, and the strength of each section of the connection is consistent, improving the overall tensile and shear resistance.

[0015] 3. When this utility model is used, the arc-shaped indentation reduces stress concentration during sleeve compression and protects the integrity of the sleeve; it also has a higher degree of fit with the steel ribs and stronger mechanical interlocking force, which, together with the bonding effect of the structural adhesive, further enhances the connection strength.

[0016] 4. When using this utility model, the insertion depth of the reinforcing bar is determined by the positioning mark, which avoids the situation of insufficient or excessive insertion depth of the reinforcing bar, ensures construction consistency, reduces human operation error, and improves the stability of connection quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of the sleeve of this utility model;

[0019] Figure 3 This is a front sectional view of the inside of the reinforcing bar and sleeve after they are inserted into the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100. Sleeve; 101. Indentation; 102. Raised structure; 200. Reinforcing bar; 201. Cavity; 300. Structural adhesive; 400. Positioning mark. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-3 The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0023] A connection structure using implanted and extruded steel bars 200, such as Figure 1 , Figure 2 and Figure 3 As shown: It includes a sleeve 100 and two reinforcing bars 200, and the reinforcing bars 200 and the sleeve 100 are used together.

[0024] Before inserting the reinforcing bar 200 into the sleeve 100, the reinforcing bar 200 and the sleeve 100 need to be tested. If the end of the reinforcing bar 200 has a serious horseshoe or bend, it should be corrected in advance or ground with a grinding wheel.

[0025] Then remove rust, mud, oil and other debris from the insertion part of the rebar 200. After cleaning, insert one of the rebars 200 into the end of the sleeve 100. After the insertion is completed, pour the structural adhesive 300 into the other end of the sleeve 100. Then insert the other rebar 200 into the same end of the sleeve 100. The insertion depth of the two rebars 200 should be consistent. At this time, the gap between the insertion ends of the two rebars 200 in the sleeve 100 forms a cavity 201, and the structural adhesive 300 fills the cavity 201.

[0026] After the two reinforcing bars 200 are inserted into the sleeve 100, an external cold press is used to compress the axial outer wall of the sleeve 100. This compression creates a radially inwardly extending indentation 101 on the outer wall of the sleeve 100. As the indentation 101 extends radially into the sleeve 100, its deformation drives the inner wall of the sleeve 100 to contract towards the cavity 201. This results in a localized protrusion 102 on the inner wall of the sleeve 100. This protrusion compresses the outer wall surface of the reinforcing bars 200, achieving a mechanical engagement between the sleeve 100 and the reinforcing bars 200. Furthermore, this protrusion 102 compresses the cavity... The structural adhesive 300 inside body 201 flows and fills the gap between the reinforcing bar 200 and the inner wall of sleeve 100. As the sleeve 100 is compressed, cracks may appear inside. At this time, the compressed structural adhesive 300 will also fill the cracks. Thus, with the cooperation of mechanical interlocking and filling by the structural adhesive 300, the connection strength between the two is improved by filling the cracks and gaps caused by compression and the gaps between the reinforcing bar 200 and sleeve 100. This enhances the reliability, durability and stability of the mating between the reinforcing bar 200 and sleeve 100.

[0027] Specifically, the structural adhesive 300 is a high-performance silicone structural adhesive 300 used in building structures. It has excellent bonding strength, weather resistance (resistance to high and low temperatures and ultraviolet rays) and flowability. During the extrusion process of the sleeve 100, it can fully fill the gaps as the sleeve 100 deforms and forms an elastic adhesive layer after curing. It has both bonding and buffering functions. Its elastic properties can alleviate the stress concentration of the steel bar 200 when it is under stress, and at the same time avoid bonding failure due to environmental aging, further improving the long-term reliability of the connection.

[0028] Specifically, both reinforcing bars 200 are ribbed reinforcing bars of the same diameter. The transverse ribs on their surfaces can be squeezed against the inner wall of the sleeve 100 to form a mechanical engagement, preventing slippage. The same diameter design ensures that the fit gap between the reinforcing bar 200 and the sleeve 100 is uniform, and the structural adhesive 300 can be filled symmetrically. Under stress, the load distribution is consistent, improving the stability and safety of the connection.

[0029] Specifically, the arc-shaped structure of the indentation 101 is formed by radial extrusion using an arc-shaped mold. The arc design makes the sleeve 100 more evenly stressed, avoiding excessive local stress that could cause the sleeve 100 to crack. At the same time, the arc-shaped indentation 101 fits better with the curved ribs of the ribbed steel bar 200, enhancing the mechanical interlocking effect. Combined with the bonding effect of the structural adhesive 300, it further improves the connection strength.

[0030] Specifically, there are multiple indentations 101, and these multiple indentations 101 are distributed at equal intervals along the axial direction of the steel sleeve 100. Through equal-interval extrusion, the sleeve 100 is subjected to uniform force in the axial direction, and the extrusion deformation is consistent. The structural adhesive 300 is evenly pushed to each gap, avoiding local insufficient filling. Furthermore, the equal-interval design ensures that the interlocking points between the reinforcing bar 200 and the sleeve 100 are evenly distributed, the load transfer is more stable, and the overall tensile and shear resistance is improved.

[0031] Furthermore, positioning marks 400 are provided on the circumferential surfaces of the two reinforcing bars 200. These positioning marks 400 can be high-contrast paint, such as red or yellow paint, applied to designated positions on the circumferential surfaces of the reinforcing bars 200. This ensures that the axial distance between the positioning marks 400 and the insertion end of the reinforcing bars 200 is maintained at a specified insertion depth. After the two reinforcing bars 200 are inserted into the sleeve 100, the outer edge of the positioning marks 400 is flush with the end face of the sleeve 100 port. The axial position of the positioning marks 400 on the reinforcing bars 200 can be adjusted according to specifications or when different configurations of reinforcing bars 200 and sleeves 100 are used.

[0032] It is worth mentioning that the distance between the insertion end of the reinforcing bar 200 and the midpoint of the axial length of the sleeve 100 should not exceed 5mm, that is, the depth of the cavity 201 should not exceed 10mm.

[0033] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A structure for connecting reinforcing bars (200) by means of implant extrusion, characterized in that, Includes sleeve (100); It also includes two steel bars (200) inserted into both ends of the sleeve (100), and the gap between the ends of the two steel bars (200) located inside the sleeve (100) forms a cavity (201); The cavity (201) is filled with structural adhesive (300); The outer wall of the sleeve (100) is provided with radially extruded indentations (101); The deformation of the indentation (101) drives the inner wall of the sleeve (100) to contract toward the cavity (201), thereby squeezing the structural adhesive (300) to flow and fill the gaps inside the cavity (201).

2. A reinforcing bar (200) connection structure employing implantation extrusion according to claim 1, characterized in that: The structural adhesive (300) is a silicone structural adhesive (300).

3. A reinforcing bar (200) connection structure employing implantation extrusion according to claim 1, characterized in that: Both of the aforementioned reinforcing bars (200) are ribbed reinforcing bars (200) of the same diameter specification.

4. A reinforcing bar (200) connection structure employing implantation extrusion according to claim 1, characterized in that: The indentation (101) has an arc-shaped structure.

5. A reinforcing bar (200) connection structure employing implantation extrusion according to claim 4, characterized in that: The number of indentations (101) is multiple, and the multiple indentations (101) are distributed at equal intervals along the axial direction of the steel sleeve (100).

6. A reinforcing bar (200) connection structure employing implantation extrusion according to claim 1, characterized in that: The two reinforcing bars (200) are provided with positioning marks (400) on their circumferential surfaces. After the two reinforcing bars (200) are inserted into the sleeve (100), the outer edge of the positioning mark (400) is flush with the end face of the sleeve (100) port to limit the insertion depth of the reinforcing bars (200).

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