High-stability steel bar sleeve

Abstract

The utility model relates to the technical field of reinforcing steel bar sleeves, in particular to a high-stability reinforcing steel bar sleeve. The high-stability reinforcing steel bar sleeve comprises a sectional type inner sleeve and an outer sleeve which are sequentially nested from inside to outside, the sectional type inner sleeve forms a sleeve body with two open ends, the sleeve body is formed by combining a plurality of sleeve sections, and a plurality of fixing clamping teeth are arranged on the inner wall face of the sectional type inner sleeve at intervals. Through the design that the sectional inner sleeve and the outer sleeve are arranged in a nested mode and the clamping teeth are fixed to the inner wall of the inner sleeve, the stability and the anti-sliding performance of the steel bar sleeve are remarkably improved. Firstly, the sectional type inner sleeve is formed by combining a plurality of sleeve sections, the split structure of the sectional type inner sleeve can disperse stress generated by external loads, and the problem of local cracking caused by stress concentration of a traditional integral type sleeve is solved.

Description

Technical Field

[0001] This utility model relates to the field of rebar sleeve technology, and in particular to a highly stable rebar sleeve. Background Technology

[0002] In structural engineering, the quality of rebar connections directly affects the stability and seismic performance of the overall structure. Traditional rebar connection methods mainly include welding, threaded sleeve connections, or integral mechanical sleeve connections. However, existing technologies have the following shortcomings: Poor stress concentration and fatigue resistance: Traditional integral sleeves are prone to stress concentration at the sleeve end or weld when under load, easily leading to cracks or fractures under long-term loads, especially under dynamic loads (such as earthquakes), where reliability is significantly reduced. High installation accuracy requirements: Threaded sleeves require strict alignment with the rebar threads, making construction difficult; while welding processes are affected by operator skill, easily leading to insufficient connection strength due to welding defects. Insufficient adaptability: Existing sleeves are mostly single-structure, making it difficult to adapt to rebars of different diameters or complex angle connections, especially limiting their application in bridges and irregular structures. Weak anti-slip performance: Some mechanical sleeves rely on friction to fix the rebar, but when the surface is smooth or the stress is uneven, the rebar is prone to slippage, affecting the overall structural integrity.

[0003] In recent years, although split-type sleeve designs have emerged to alleviate stress concentration problems, such as the "split-type rebar connecting sleeve" disclosed in CN110656752A, its symmetrical split structure and straight-line splicing at the joints make it prone to misalignment under torsional loads. Furthermore, the lack of an effective fixing structure on the inner wall means there is still a risk of slippage between the rebar and the sleeve. Another example is the "multi-segment rebar connector" proposed in CN212336128U, which reduces processing difficulty through segmented design, but the planar splicing between segments results in insufficient overall bending resistance of the sleeve, and it fails to consider the synergistic reinforcement effect of the outer and inner sleeves.

[0004] Therefore, there is an urgent need for a new type of steel sleeve structure that can optimize stress distribution and improve anti-slip capability through innovative nested segment design, while taking into account both ease of installation and stability under complex working conditions. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a highly stable rebar sleeve.

[0006] This utility model discloses a high-stability rebar sleeve, comprising a segmented inner sleeve and an outer sleeve nested sequentially from the inside to the outside. The segmented inner sleeve is formed as a cylinder with openings at both ends, consisting of multiple sleeve segments. The inner wall surface of the segmented inner sleeve is provided with multiple spaced fixing teeth.

[0007] Through the above technical solutions, this application significantly improves the stability and anti-slip performance of the rebar sleeve by using the "segmented inner sleeve and outer sleeve nesting" and "inner sleeve inner wall fixing teeth" design. First, the segmented inner sleeve is composed of multiple sleeve segments, and its split structure can disperse the stress generated by external loads, avoiding the problem of local cracking caused by stress concentration in traditional integral sleeves.

[0008] Secondly, the fixing teeth act directly on the surface of the reinforcing bar, and the mechanical interlocking greatly enhances the friction between the sleeve and the reinforcing bar, effectively preventing the reinforcing bar from slipping.

[0009] In addition, the nested outer sleeve provides radial constraint to the segmented inner sleeve, further limiting the deformation range of the inner sleeve and ensuring the structural integrity of the sleeve under long-term high load.

[0010] Furthermore, the segmented inner sleeve includes:

[0011] The first segment is formed as a cylinder with openings at both ends and a through mounting chamber inside.

[0012] The second segment has two sections, each formed as a frustum with open ends. The end face of the bottom surface of each second segment is fixedly connected to the end faces of the two ends of the first segment.

[0013] The third segment has two sections, each formed as a cylinder with open ends. The end face of each third segment is fixedly connected to the end face of the upper bottom surface of each second segment.

[0014] Through the above technical solution, this application solves the technical problems of poor adaptability and high installation accuracy requirements of traditional sleeves by defining the specific structure of the segmented inner sleeve (first segment, second segment, and third segment). The cylindrical installation chamber of the first segment provides a guiding benchmark for the insertion of the reinforcing bar, reducing the difficulty of alignment during construction; its through-type design facilitates visual detection of the insertion depth of the reinforcing bar, ensuring connection reliability.

[0015] The second section adopts a frustum-shaped structure. Its tapered section generates radial compressive force when subjected to force, actively pressing the surface of the reinforcing bar and forming a synergistic locking effect with the fixed locking teeth.

[0016] The cylindrical end of the third segment provides a stable support surface for the outer sleeve, preventing deformation of the sleeve end due to stress concentration. The combination of the three components forms an integrated "guide-clamping-support" structure, which can accommodate steel bars of different diameters (such as the adjustable frustum angle of the second segment) and simplifies the manufacturing process.

[0017] Furthermore, the multi-sleeve segment has three sections and is formed into an arc-shaped plate.

[0018] Through the above technical solution, this application optimizes the manufacturing process and mechanical properties of the sleeve by limiting the multi-segment sleeve to "three-segment arc-shaped plates". First, the radius of curvature of the arc-shaped plate matches the outer diameter of the reinforcing bar, ensuring full circumferential contact between the inner wall of the sleeve and the surface of the reinforcing bar, thus eliminating the local gap problem of traditional flat plate spliced ​​sleeves.

[0019] Secondly, the three-section split design allows for the individual processing of each arc segment using stamping or casting processes, reducing reliance on large processing equipment. Furthermore, the discontinuous circumferential distribution of the seam lines in the arc-shaped panels avoids the risk of through-cracks in straight seams under torsional loads.

[0020] Furthermore, the joint line formed by the splicing surfaces of two adjacent sleeve segments is formed as a curve.

[0021] Through the above technical solution, this application effectively solves the problems of easy misalignment and stress concentration in traditional straight joints by defining the "curved joint line" of the splicing surface of adjacent sleeve sections. The curved joint (such as wavy or sawtooth shape) increases the contact area and frictional resistance of the splicing surface. Under the action of axial tensile force or torque, the concave and convex structures on both sides of the joint line interlock with each other, forming a self-locking effect and suppressing the relative displacement between sleeve sections.

[0022] Furthermore, curved joints disperse stress concentration points at the ends of traditional straight joints, delaying crack propagation. Under the same load, the peak stress in the curved joint region is lower than that in the straight joint, significantly extending the service life of the sleeve.

[0023] Furthermore, the outer sleeve includes a first outer sleeve and a second outer sleeve arranged opposite to each other. The first outer sleeve and the second outer sleeve have the same structure. The inner wall surface of the first outer sleeve is provided with a first inner wall surface, a second inner wall surface and a third inner wall surface that match the first segment, the second segment and the third segment. The diameter of the first inner wall surface, the second inner wall surface and the third inner wall surface is not less than the diameter of the first segment, the second segment and the third segment.

[0024] Through the above technical solution, this application achieves a balance between ease of sleeve assembly and structural stability by using a split outer sleeve (first outer sleeve and second outer sleeve) and its matching inner wall design. The split outer sleeve allows the inner sleeve to be inserted from both sides, simplifying the installation process and making it particularly suitable for on-site construction in narrow spaces or for prefabricated components.

[0025] Matching the inner wall surfaces (first to third inner wall surfaces) ensures a tight fit between the outer sleeve and each section of the inner sleeve, forming a uniform radial pressure distribution. By precisely controlling the inner diameter of the outer sleeve to be slightly larger than the outer diameter of the inner sleeve, smooth assembly is ensured while avoiding installation difficulties caused by interference fit.

[0026] By means of the above solution, this utility model has at least the following advantages:

[0027] (1) This application significantly improves the stability and anti-slip performance of the rebar sleeve through the design of "segmented inner sleeve and outer sleeve nesting" and "fixed retaining teeth on the inner wall of the inner sleeve". First, the segmented inner sleeve is composed of multiple sleeve segments. Its split structure can disperse the stress generated by external loads and avoid the problem of local cracking caused by stress concentration in traditional integral sleeves. Second, the fixed retaining teeth act directly on the surface of the rebar, and the friction between the sleeve and the rebar is greatly enhanced through mechanical interlocking, which effectively prevents the rebar from slipping. In addition, the nested outer sleeve forms a radial constraint on the segmented inner sleeve, further limiting the deformation range of the inner sleeve and ensuring the structural integrity of the sleeve under long-term high load.

[0028] (2) This application solves the technical problems of poor adaptability and high installation accuracy requirements of traditional sleeves by defining the specific structure of the segmented inner sleeve (first segment, second segment, and third segment). The cylindrical installation chamber of the first segment provides a guiding benchmark for the insertion of the reinforcing bar, reducing the difficulty of alignment during construction; its through design facilitates visual detection of the insertion depth of the reinforcing bar, ensuring connection reliability. The second segment adopts a frustum-shaped structure, and its tapered section generates radial compressive force when under stress, actively pressing the surface of the reinforcing bar and forming a synergistic locking effect with the fixing teeth. The cylindrical end of the third segment provides a stable support surface for the outer sleeve, avoiding deformation of the sleeve end due to stress concentration. The combination of the three forms an integrated "guide-clamping-support" structure, which can adapt to reinforcing bars of different diameters (such as the adjustable frustum angle of the second segment) and simplifies the processing technology.

[0029] (3) This application effectively solves the problems of misalignment and stress concentration in traditional straight joints by defining a "curved joint line" on the mating surface of adjacent sleeve sections. The curved joint (such as a wavy or sawtooth shape) increases the contact area and frictional resistance of the mating surface. Under axial tension or torque, the concave and convex structures on both sides of the joint line interlock, forming a self-locking effect and suppressing the relative displacement between sleeve sections. In addition, the curved joint disperses the stress concentration points at the ends of traditional straight joints, delaying crack propagation. Under the same load, the peak stress in the curved joint area is lower than that in the straight joint, significantly extending the service life of the sleeve.

[0030] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the segmented inner sleeve of this utility model;

[0033] Figure 2 This is a top view of the segmented inner sleeve of this utility model;

[0034] Figure 3 This is a left view of the segmented inner sleeve of this utility model;

[0035] Figure 4 This is a cross-sectional view of the high-stability steel bar sleeve of this utility model;

[0036] In the figure: 1. Segmented inner sleeve; 11. Fixing tooth; 12. First segment; 13. Second segment; 14. Third segment; 15. Sleeve segment; 2. Outer sleeve; 21. First outer sleeve; 22. Second outer sleeve; 23. First inner wall surface; 24. Second inner wall surface; 25. Third inner wall surface. Detailed Implementation

[0037] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0038] See Figure 1 and Figure 4 This utility model discloses a high-stability rebar sleeve, comprising a segmented inner sleeve 1 and an outer sleeve 2 fitted onto the outer circumference of the segmented inner sleeve 1. The segmented inner sleeve 1 is formed by splicing three arc-shaped plates together, and the joint line formed by the splicing surfaces of adjacent sleeve segments 15 is curved. The segmented inner sleeve 1 is open at both ends and has a receiving cavity. On the inner wall surface of the segmented inner sleeve 1, there are multiple equally spaced annular fixing teeth 11, which form a good locking structure with the threaded surface of the rebar through the fixing teeth 11, further improving the stability of this rebar sleeve.

[0039] See Figures 1-3The segmented inner sleeve 1 of this utility model comprises a first segment 12, a second segment 13, and a third segment 14. The first segment 12 is a cylinder open at both ends. Two second segments 13 are fixedly connected to the two end faces of the first segment 12. The two second segments 13 are formed into frustums, and the end faces of the first segment 12 are fixedly connected to the lower bottom faces of the second segments 13. Two third segments 14 are also provided at the upper bottom faces of the second segments 13, each of which is a cylinder open at both ends. It should be noted that the first segment 12, the second segment 13, and the third segment 14 are integrally formed and interconnected.

[0040] An outer sleeve 2 is provided on the outer circumferential surface of the segmented inner sleeve 1. The outer sleeve 2 has two opposing sections: a first outer sleeve 21 and a second outer sleeve 22. The inner walls of the first outer sleeve 21 and the second outer sleeve 22 are provided with a first inner wall surface 23, a second inner wall surface 24, and a third inner wall surface 25. The first inner wall surface 23, the second inner wall surface 24, and the third inner wall surface 25 respectively cooperate with and abut against the first segment 12, the second segment 13, and the third segment 14.

[0041] It should be noted that the diameters of the first inner wall surface 23, the second inner wall surface 24, and the third inner wall surface 25 are not less than the diameters of the first segment 12, the second segment 13, and the third segment 14.

[0042] The working steps of this utility model are as follows:

[0043] When it is necessary to fix two sections of threaded steel bars, the three sleeve sections 15 of the segmented inner sleeve 1 in the high-stability steel bar sleeve of this application are opened and abutted against the outer surface of the threaded steel bar. After the three sleeve sections 15 are closed by mutual cooperation, the first outer sleeve 21 and the second outer sleeve 22 are hydraulically tightened along the circumferential direction of the steel bar. The first outer sleeve 21 and the second outer sleeve 22 move relative to each other until the first inner wall surface 23, the second inner wall surface 24 and the third inner wall surface 25 on the first outer sleeve 21 and the second outer sleeve 22 abut against and fit against the first section body 12, the second section body 13 and the third section body 14 respectively. Under the action of tension force, the two sections of threaded steel bars are effectively locked.

[0044] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0045] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0046] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-stability rebar sleeve, characterized in that, It includes a segmented inner sleeve (1) and an outer sleeve (2) nested from the inside out. The segmented inner sleeve (1) is formed as a cylinder with open ends, consisting of multiple sleeve segments (15). The inner wall of the segmented inner sleeve (1) is provided with multiple spaced fixing teeth (11).

2. The high-stability rebar sleeve according to claim 1, characterized in that, The segmented inner sleeve (1) includes: The first segment (12) is formed as a cylinder with openings at both ends and has a through mounting chamber inside. The second segment (13) has two sections, each of which is formed as a frustum with open ends. The end face of the bottom surface of each second segment (13) is fixedly connected to the end faces of the two ends of the first segment (12). The third segment (14) has two sections, each formed as a cylinder with open ends. The end face of each third segment (14) is fixedly connected to the end face of the upper bottom surface of each second segment (13).

3. A high-stability rebar sleeve according to claim 2, characterized in that, The multi-sleeve section (15) has three sections and is formed as an arc-shaped plate.

4. A high-stability rebar sleeve according to claim 3, characterized in that, The joint line formed by the splicing surfaces of two adjacent sleeve sections (15) is a curve.

5. A high-stability rebar sleeve according to claim 4, characterized in that, The outer sleeve (2) includes a first outer sleeve (21) and a second outer sleeve (22) arranged opposite to each other. The first outer sleeve (21) and the second outer sleeve (22) have the same structure. The inner wall surface of the first outer sleeve (21) is provided with a first inner wall surface (23), a second inner wall surface (24) and a third inner wall surface (25) that match the first segment (12), the second segment (13) and the third segment (14). The diameter of the first inner wall surface (23), the second inner wall surface (24) and the third inner wall surface (25) is not less than the diameter of the first segment (12), the second segment (13) and the third segment (14).

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