Steel bar connecting structure and connecting device thereof
By setting external threads and segmented rings on the reinforcing bars, combined with hydraulic cylinders and grippers, the problems of low efficiency and poor stability of existing reinforcing bar connections are solved, achieving fast and stable reinforcing bar connections.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-04-03
AI Technical Summary
Existing rebar connection methods are inefficient in on-site construction, and the internal threads of axially cold-extruded rebar sleeves are prone to deformation, resulting in poor connection stability.
External threads are provided on the bottom reinforcing bars and the reinforcing bars to be connected. The locking ring sleeve and the limiting ring sleeve are designed in a segmented manner. Combined with the hydraulic cylinder and the gripper part, the rapid connection and disassembly of the reinforcing bars can be realized.
It improves the fastening effect of steel bar connections, simplifies the disassembly process of connection devices, enhances construction efficiency, and ensures the stability of connections.
Smart Images
Figure CN224078510U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steel bar connection technology, specifically to a steel bar connection structure and its connection device. Background Technology
[0002] During construction, it is usually necessary to fabricate pile foundation reinforcement cages on-site, which involves connecting multiple reinforcing bars to form a pile foundation reinforcement cage that meets the length requirements. Existing reinforcement connection methods mainly use straight thread sleeve connections and axially cold-extruded reinforcing bar sleeves.
[0003] In some cases, when using axially cold-extruded rebar sleeves for rebar connection, the connecting device uses a hydraulic cylinder to extend and retract, causing the circular sleeve to move and compress the axially cold-extruded rebar sleeve to connect the upper rebar to the bottom rebar. However, after the rebar is connected, the circular sleeve of the connecting device fits onto the rebar and cannot be moved laterally. The connecting device needs to be lifted and removed from the top of the rebar. Since the rebar used in the rebar cage is generally quite long, removing the connecting device often takes a lot of time, affecting work efficiency. Furthermore, existing axially cold-extruded rebar sleeves often have internal threads to enhance the stability of the connection between the sleeve and the rebar after extrusion. However, in actual use, due to the compression of the axially cold-extruded rebar sleeve, the internal threads deform against the outer wall of the rebar. Since the rigidity of the axially cold-extruded rebar sleeve is not as high as that of the rebar, the internal threads will deform due to the compression deformation, resulting in the actual effect of enhancing stability being insignificant. Utility Model Content
[0004] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a steel bar connection structure. This application provides the following technical solution: including a bottom steel bar, a steel bar to be connected, and a cold-extruded steel bar sleeve that is fitted and pressed on the bottom steel bar and the steel bar to be connected. The bottom steel bar and the steel bar to be connected have external threads at one end that extends into the cold-extruded steel bar sleeve.
[0005] This application also provides a rebar connection device that can be used in the construction of the above-mentioned rebar connection structure, including a hydraulic cylinder, a fixed jaw connected and fixed to the cylinder barrel of the hydraulic cylinder, and a movable jaw connected to the piston rod of the hydraulic cylinder. Both the fixed jaw and the movable jaw have an opening on one side. A locking ring sleeve and a limiting ring sleeve are respectively installed on the fixed jaw and the movable jaw. Both the locking ring sleeve and the limiting ring sleeve are composed of two axially divided parts.
[0006] The cylinder is fitted with a movable cover, which is fixedly connected to the piston rod. The movable jaw is fixed to the bottom outer side of the movable cover.
[0007] The bottom of the fixed jaw is provided with a threaded groove, and the limiting ring sleeve is provided with a threaded ring that mates with the threaded groove. The limiting ring sleeve includes a pair of limiting half-ring sleeves joined together by a wedge structure.
[0008] The top of the movable jaw is provided with a placement slot, and the locking ring sleeve is provided with a limiting block that fits into the placement slot. The locking ring sleeve includes a pair of locking half-ring sleeves that can be spliced together.
[0009] A handle is fixedly connected to the cylinder.
[0010] The cylinder is fixedly connected to the bottom of the cylinder. The support arm is provided with a gripper portion. The gripper portion includes a fixed shell fixed to the support arm and a ring cover with one end hinged to the fixed shell. The other end of the ring cover is provided with a latch between it and the fixed shell.
[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0012] By starting external threads on the bottom reinforcing bars and the reinforcing bars to be connected, when the cold-extruded reinforcing bar sleeve is deformed by compression, its inner wall abuts against the bottom reinforcing bars and the reinforcing bars to be connected, forming a thread groove on its inner wall that corresponds to the external threads on the bottom reinforcing bars and the reinforcing bars to be connected. This can greatly enhance the fastening effect between the cold-extruded reinforcing bar sleeve and the bottom reinforcing bars and the reinforcing bars to be connected.
[0013] Both the fixed jaw and the movable jaw have openings on one side, allowing the rebar to be moved into or out of the jaws. The locking ring and the limiting ring are designed to be detached; they can be removed from the fixed jaw and the movable jaw and then split in half to allow them to be moved laterally out of the rebar. Thus, after the rebar connection is completed, the rebar can be moved laterally out of the fixed jaw, the movable jaw, the locking ring, and the limiting ring without having to lift the connection device to the top of the rebar and remove it from the top.
[0014] Meanwhile, the cylinder is also designed with a handle and a support arm. The handle allows the user to move the connecting device easily. The support arm and the gripper on the support arm can be engaged and fixed with the bottom fixed steel bar. This not only provides support for the connecting device when it is working, but also, after it is fixed with the bottom steel bar, the positions of the cylinder, the fixed jaw, and the limiting ring are fixed relative to the bottom steel bar. The position of the limiting ring on the fixed jaw determines the final fixed position of the cold extruded steel bar sleeve, thus playing a role in pre-positioning the final position of the cold extruded steel bar sleeve.
[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present 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.
[0017] Figure 1 This is a schematic diagram of a steel reinforcement connection structure.
[0018] Figure 2 This is a cross-sectional view of a steel bar connection device.
[0019] Figure 3 This is a schematic diagram of a steel bar connection device.
[0020] Figure 4 This is a schematic diagram of a steel bar connection device from another perspective.
[0021] Figure 5 This is a schematic diagram of the disassembly of a steel bar connection device.
[0022] Reference numerals: A. Bottom reinforcing bar; B. Reinforcing bar to be connected; C. Cold-extruded reinforcing bar sleeve; 1. Hydraulic cylinder; 11. Cylinder barrel; 12. Piston rod; 2. Fixed jaws; 21. Threaded groove; 3. Moving jaws; 31. Placement slot; 4. Locking ring sleeve; 41. Limiting block; 42. Locking half-ring sleeve; 5. Limiting ring sleeve; 51. Threaded ring; 52. Limiting half-ring sleeve; 6. Movable cover; 7. Holding handle; 8. Support arm; 81. Gripper part; 82. Fixed shell; 83. Ring cover; 84. Lock. Detailed Implementation
[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0026] Please refer to Figure 1 As shown, this utility model provides a steel bar connection structure, including a bottom steel bar A, a steel bar B to be connected, and a cold-extruded steel bar sleeve C that is fitted and pressed onto the bottom steel bar A and the steel bar B to be connected. The bottom steel bar A and the steel bar B to be connected have external threads at one end that extends into the cold-extruded steel bar sleeve C.
[0027] Please refer to Figure 2-5 As shown, this utility model provides a rebar connection device, including a hydraulic cylinder 1, a fixed jaw 2 connected and fixed to the cylinder barrel 11 of the hydraulic cylinder 1, and a movable jaw 3 connected to the piston rod 12 of the hydraulic cylinder 1. Both the fixed jaw 2 and the movable jaw 3 have an opening on one side. The fixed jaw 2 and the movable jaw 3 are respectively equipped with a locking ring sleeve 4 and a limiting ring sleeve 5. Both the locking ring sleeve 4 and the limiting ring sleeve 5 are composed of two axially divided parts.
[0028] The cylinder 11 is fitted with a movable cover 6, which is fixedly connected to the piston rod 12. The movable jaw 3 is fixed to the bottom outer side of the movable cover 6.
[0029] The bottom of the fixed jaw 2 is provided with a threaded groove 21, and the limiting ring sleeve 5 is provided with a threaded ring 51 that cooperates with the threaded groove 21. The limiting ring sleeve 5 includes a pair of limiting half-ring sleeves 52 that are spliced together by a wedge structure.
[0030] The top of the movable jaw 3 is provided with a placement slot 31, and the locking ring sleeve 4 is provided with a limiting block 41 that fits into the placement slot 31. The locking ring sleeve 4 includes a pair of locking half-ring sleeves 42 that can be spliced together.
[0031] A handle 7 is fixedly connected to the cylinder 11.
[0032] A support arm 8 is fixedly connected to the bottom of the cylinder 11. A gripper portion 81 is provided on the support arm 8. The gripper portion 81 includes a fixed shell 82 fixed to the support arm 8 and a ring cover 83 with one end hinged to the fixed shell 82. A latch 84 is provided between the other end of the ring cover 83 and the fixed shell 82.
[0033] In practice, the user picks up the connecting device by holding the handle 7, and first clamps it with the bottom steel bar through the jaws 81. During clamping, the locking buckle 84 is released so that the bottom steel bar B fits against the inner wall of the fixing shell 82. Then, the ring cover 83 is closed and the locking buckle 84 is locked, clamping the ring cover 83, the fixing shell 82, and the bottom steel bar A. Before clamping, the clamping position is adjusted so that the distance between the bottom surface of the limiting ring sleeve 5 and the top of the bottom steel bar A is half the length of the cold-extruded steel bar sleeve C. Then, the cold-extruded steel bar sleeve C is fitted onto the bottom steel bar A, and the steel bar B to be connected is placed on top of the bottom steel bar A. The hydraulic cylinder 1 is activated, and the piston rod 12 extends from the cylinder 11. The piston rod 12 drives the movable cover 6 to move upward, and the moving jaws 3 move with the movable cover 6, causing the locking ring sleeve 4 to move closer to the limiting ring sleeve 5. During this period, the locking ring sleeve 4 pushes the cold-extruded steel bar sleeve C to move until the top of the cold-extruded steel bar sleeve C abuts against the limiting ring sleeve 5. The locking ring sleeve 4 then continues to move. Continuing upwards, the cold-extruded rebar sleeve C is pressed into the locking ring sleeve 4, and is clamped and locked with the bottom rebar A and the rebar B to be connected. Finally, the entire cold-extruded rebar sleeve C is pressed tightly by the locking ring sleeve 4, completing the connection of the rebar. When the connecting device is working, the user can hold the handle 7 to assist in supporting the connecting device. Then, the connecting device is removed. The locking ring sleeve 4 is moved upwards to move it out of the moving jaw 3, and the limiting block 41 is moved out of the placement slot 31. The locking ring sleeve 4 is then split into two locking half-ring sleeves 42, and the locking half-ring sleeves 42 are removed from the rebar. The limiting ring sleeve 5 is then unscrewed from the fixed jaw 2, and the threaded ring 51 is turned out from the threaded groove 21. The limiting ring sleeve 5 is then split into two limiting half-ring sleeves 52 and removed from the rebar. Finally, the user moves the connecting device by holding the handle 7, so that the rebar passes through the openings of the fixed jaw 2 and the moving jaw 3, and the connecting device can be removed from the rebar.
[0034] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A steel bar connection structure, comprising a bottom steel bar (A), steel bars to be connected (B), and a cold-extruded steel bar sleeve (C) fitted and pressed onto the bottom steel bar (A) and the steel bars to be connected (B), characterized in that: The bottom reinforcing bar (A) and the reinforcing bar to be connected (B) are provided with external threads at one end when they extend into the cold-extruded reinforcing bar sleeve (C).
2. A rebar connection device, comprising a hydraulic cylinder (1), a fixed jaw (2) fixedly connected to the cylinder barrel (11) of the hydraulic cylinder (1), and a movable jaw (3) connected to the piston rod (12) of the hydraulic cylinder (1), characterized in that: Both the fixed jaw (2) and the movable jaw (3) have openings on one side. The fixed jaw (2) and the movable jaw (3) are respectively equipped with a locking ring sleeve (4) and a limiting ring sleeve (5). The locking ring sleeve (4) and the limiting ring sleeve (5) are both composed of two axially divided parts.
3. A steel bar connection device as described in claim 2, characterized in that: The cylinder (11) is covered with a movable cover (6), which is fixedly connected to the piston rod (12). The movable jaw (3) is fixed to the bottom of the outer side of the movable cover (6).
4. A steel bar connection device as described in claim 3, characterized in that: The fixed jaw (2) is provided with a threaded groove (21) at the bottom, and the limiting ring sleeve (5) is provided with a threaded ring (51) that cooperates with the threaded groove (21). The limiting ring sleeve (5) includes a pair of limiting half-ring sleeves (52) spliced by a wedge structure.
5. A steel bar connection device as described in claim 4, characterized in that: The movable jaw (3) is provided with a placement slot (31) at the top, and the locking ring sleeve (4) is provided with a limiting block (41) that fits into the placement slot (31). The locking ring sleeve (4) includes a pair of locking half-ring sleeves (42) that can be spliced together.
6. A steel bar connection device as described in claim 5, characterized in that: A handle (7) is fixedly connected to the cylinder (11).
7. A steel bar connection device as described in claim 6, characterized in that: The bottom of the cylinder (11) is fixedly connected to a support arm (8), and the support arm (8) is provided with a gripper (81). The gripper (81) includes a fixed shell (82) fixed to the support arm (8) and a ring cover (83) hinged to the fixed shell (82) at one end. A latch (84) is provided between the other end of the ring cover (83) and the fixed shell (82).