Reinforcing steel bar construction stirrup bender

Abstract

A stirrup bender for steel bar construction relates to the technical field of processing or treatment of metal wires and comprises a holding portion, a bending portion and a bending portion. The first bending part is arranged at one end of the holding part, and a first sleeve end hole used for containing the end of a steel bar is formed in the side, away from the holding part, of the first bending part; the second bending part is fixedly arranged on one side of the first bending part, and a second sleeve end hole used for containing the end of a steel bar is formed in the second bending part; the second sleeve end hole and the first sleeve end hole face opposite directions; by means of the collaborative design of the double-sleeve structure and the staged bending technology, the technical problems that according to a traditional prefabricated double-elbow stirrup, the fitting degree is insufficient, the structure tripping risk is caused, and materials are wasted due to the main reinforcement interval construction error are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of metal wire processing or treatment technology, and in particular to a rebar stirrup bending device for steel reinforcement construction. Background Technology

[0002] In the reinforcement construction of tunnel secondary lining, the traditional method for installing stirrups often employs double-end pre-bending. However, this approach not only results in excessively long stirrups but also makes it difficult for one end of the stirrup to fit tightly against the main reinforcement during installation, leading to potential detachment and affecting construction quality and efficiency. On the other hand, attempting single-end pre-bending with a conventional single-sleeve bending device typically only achieves a bending angle of approximately 90°, failing to bend the stirrup to 180°. Even if bending is possible, the operation is laborious and inconvenient. Therefore, developing a stirrup bender that is both efficient and convenient, ensuring stable installation while saving steel, has become an urgent need in the field of tunnel secondary lining reinforcement construction. Utility Model Content

[0003] The technical problem to be solved by this utility model is the material waste caused by the solidification of geometric shape in the existing prefabricated double-bend stirrup process.

[0004] To achieve the above objectives, according to one aspect of the utility model, a rebar stirrup bending device is provided, comprising: a gripping part for operation by a person; a first bending part disposed at one end of the gripping part, wherein a first sleeve end hole for receiving the end of a rebar is provided on the side of the first bending part away from the gripping part; a second bending part fixedly disposed on one side of the first bending part, wherein a second sleeve end hole for receiving the end of a rebar is provided on the second bending part; the second sleeve end hole faces opposite to the first sleeve end hole.

[0005] As a preferred embodiment of the above technical solution, the second curved portion is further provided with a third sleeve end hole for accommodating the end of the reinforcing bar, and the third sleeve end hole is located on the side away from the second sleeve end hole.

[0006] As a preferred embodiment of the above technical solution, the third sleeve end hole and the second sleeve end hole are coaxial and connected, and the third sleeve end hole and the second sleeve end hole have the same diameter.

[0007] As a preferred embodiment of the above technical solution, the second bent portion is axially parallel to the first bent portion and is welded and fixed.

[0008] As a preferred embodiment of the above technical solution, the end face of the second curved portion away from the second sleeve end hole is coplanar with the end face of the first curved portion having the first sleeve end hole.

[0009] As a preferred embodiment of the above technical solution, the gripping part is integrally formed with the first curved part.

[0010] As a preferred embodiment of the above technical solution, the first curved portion is coaxially arranged with the gripping portion, and the first sleeve end hole extends axially and penetrates the gripping portion.

[0011] As a preferred embodiment of the above technical solution, the gripping part has an anti-slip layer evenly distributed on its surface.

[0012] As a preferred embodiment of the above technical solution, the gripping part is provided with spiral reinforcing ribs.

[0013] As a preferred embodiment of the above technical solution, a double-sided weld is provided in the welding area between the second bent portion and the first bent portion.

[0014] In summary, this utility model has the following advantages:

[0015] 1. This utility model effectively solves the three major technical problems of traditional precast double-bend stirrups caused by construction errors in the spacing of main bars, such as insufficient fit, risk of structural disengagement, and material waste, through the synergistic design of double sleeve structure (the end holes of the first sleeve and the second sleeve are set in opposite directions) and staged bending process.

[0016] 2. Furthermore, this utility model adds a third sleeve end hole to form a three-station structure. By selectively matching the hole position direction with the main rib space constraint, the bending operation problem under the narrow slit interference condition is solved.

[0017] 3. Furthermore, the through-hole structure formed by the connecting holes of the second and third sleeves enables full-depth clamping of the remaining section of the stirrup, completely avoiding the risk of short-end slippage.

[0018] Further or other beneficial effects will be discussed in the embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the bending device;

[0020] Figure 2 This is a perspective view of the bender;

[0021] Figure 3 This is a schematic diagram of the working process of the bending device in this application;

[0022] Figure 4 This is a schematic diagram illustrating one arrangement of the gripping part of the bending device;

[0023] Figure 5 This is a schematic diagram illustrating another configuration of the gripping part of the bending device;

[0024] Among them, 1-grip part, 11-anti-slip layer, 12-spiral reinforcing rib, 2-first curved part, 21-first sleeve end hole, 3-second curved part, 31-second sleeve end hole, 32-third sleeve end hole. Detailed Implementation

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0026] The present invention will be further explained below with reference to the embodiments:

[0027] Example:

[0028] A rebar stirrup bender for steel reinforcement construction, combined with Figure 1 and Figure 2 The device includes a gripping part 1, a first curved part 2, and a second curved part 3. The first curved part 2 is disposed at one end of the gripping part 1, and a first sleeve end hole 21 for accommodating the end of the reinforcing bar is provided on the side of the first curved part 2 away from the gripping part 1. A second curved part 3 is disposed on one side of the first curved part 2. The first curved part 2 and the second curved part 3 are axially parallel and fixed by welding. A double-sided weld is provided in the welding area between the second curved part 3 and the first curved part 2. The welding length covers more than 95% of the contact area between the first curved part 2 and the second curved part 3. A second sleeve end hole 31 for accommodating the end of the reinforcing bar is provided on the second curved part 3. The second sleeve end hole 31 and the first sleeve end hole 21 face opposite directions.

[0029] Based on the above structural settings, and referring to Figure 3 The basic structure of this application operates as follows in practical applications:

[0030] S1 Stirrup Preparation: First, cut the stirrups to the specified length according to the design requirements. Then, at the processing plant, use a benchtop bending machine to pre-bend one end of the stirrup to 180° to form a hook-shaped structure that can hook onto the outer main reinforcement bars. Figure 3 The initial stirrup shape is j1, and it is then transported to the construction site for later use.

[0031] S2 Initial Bending: On-site steelworkers hook the pre-bent end of the stirrup onto the outer main reinforcement bar, then select the first sleeve end hole 21 on the stirrup bender, and fit it onto the vertical end of the stirrup (the end of the stirrup that is not pre-bent). Following the first construction direction v1, the vertical end of the stirrup is bent 90°. Figure 3The shape of the stirrup j2 lays the foundation for subsequent operations;

[0032] S3 Final Bending and Installation: After completing the initial bending, remove the stirrup bender and fit the second sleeve end hole 31 onto the vertical end of the stirrup that has been bent 90°. Continue bending in the second construction direction v2 until the remaining 90° bend is completed, and the stirrup becomes as shown. Figure 3 The final stirrup shape j3 is determined to ensure that the stirrups can be securely installed on the main reinforcement.

[0033] Under the above steps, since the bending work on site is carried out close to the main reinforcement, the installed stirrups have a better fit with the main reinforcement, effectively avoiding the problem of stirrup loosening and easy detachment caused by improper installation. For example, in the traditional process, the two ends are prefabricated into a bent state. When there is a construction error in the spacing of the main reinforcement, a gap will be generated between the bent end and the main reinforcement, leading to the risk of structural disengagement. This solution dynamically adapts to the actual spacing of the main reinforcement by forming the secondary ends in stages on site, eliminating structural gaps. More importantly, this bender reduces the steel bar loss caused by the traditional double-head pre-bending and direct binding of ultra-long steel bars, achieving the goal of cost reduction and efficiency improvement in tunnel construction. In addition, in step S3 of this embodiment, the stirrup is bent through the second sleeve end hole 31, such as Figure 3 As shown in the diagram, the applied force remains the same during the bending process. Figure 3 The force is applied in a clockwise direction, and the force trajectory in the bending construction direction avoids the direction of the main reinforcement arrangement. This ensures that the bending machine body and the operator's hands are always on the open side of the main reinforcement array, avoiding interference between the equipment and the operator's hands and the installed main reinforcement during construction, and ensuring the effective transmission of leverage force.

[0034] Furthermore, the second bending section 3 is also provided with a third sleeve end hole 32 for accommodating the end of the reinforcing bar. The third sleeve end hole 32 is located on the side away from the second sleeve end hole 31, so that the bender forms a three-position sleeve structure. The third sleeve end hole 32 and the first sleeve end hole 21 are synchronously distributed to form a bending position combination with selectable force direction. In the case of spatial interference of the main reinforcing bar array at the construction site, the third sleeve end hole 32 can be selected to perform the initial bending operation of stage S1. Preferably, the main operation mode selects the first sleeve end hole 21 to perform the initial bending because the force applied by the first sleeve end hole 21 is more ergonomic and can reduce construction fatigue. Furthermore, the third sleeve end hole 32 and the second sleeve end hole 31 are coaxial and connected, and the diameters of the third sleeve end hole 32 and the second sleeve end hole 31 are the same. During the construction site, when the stirrups are wrapped around the main bars, the length of the stirrups themselves may not be suitable due to the inability to completely determine the spacing of the main bars. In this case, if the second sleeve end hole 31 is a blind hole, it may cause insufficient force application area or direct slippage when bending. Therefore, as a preferred option, the second sleeve end hole 31 and the third sleeve hole are connected to form a through hole. In this case, no matter how long the vertical end of the stirrup is, the second sleeve end hole 31 can pass through and bend, and at least there will be no slippage problem.

[0035] In addition, the end face of the second curved portion 3 away from the second sleeve end hole 31 is coplanar with the end face of the first curved portion 2 where the first sleeve end hole 21 is provided; this ensures that the two have the largest welding area and enhances the structural strength.

[0036] The first curved part 2 is coaxially arranged with the holding part 1, and the first sleeve end hole 21 extends axially and penetrates the holding part 1; the above-mentioned arrangement of the first sleeve end hole 21 is the same as the arrangement of the second sleeve end hole 31, both of which are to adapt to the vertical ends of stirrups of different lengths.

[0037] Reference Figure 4 The surface of the grip portion 1 is uniformly covered with an anti-slip layer 11; in another embodiment, referring to Figure 5 Since the grip part 1 is used to bend the stirrups, its structure needs to be strengthened. Therefore, the surface is provided with spiral reinforcing ribs 12. The setting of reinforcing ribs also increases the contact area between the operator's hand and the grip part 1, and can also increase friction.

[0038] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0039] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A rebar stirrup bender for steel reinforcement construction, characterized in that, Including: The grip is the part that the operator holds and operates. A first curved portion is provided at one end of the gripping portion, and a first sleeve end hole for accommodating the end of the reinforcing bar is provided on the side of the first curved portion away from the gripping portion. The second curved portion is fixedly disposed on one side of the first curved portion, and the second curved portion is provided with a second sleeve end hole for accommodating the end of the reinforcing bar; the second sleeve end hole faces the opposite direction to the first sleeve end hole.

2. The rebar stirrup bender according to claim 1, characterized in that, The second curved portion is also provided with a third sleeve end hole for accommodating the end of the reinforcing bar, and the third sleeve end hole is located on the side away from the second sleeve end hole.

3. A rebar stirrup bender according to claim 2, characterized in that, The third sleeve end hole and the second sleeve end hole are coaxial and connected, and the third sleeve end hole and the second sleeve end hole have the same diameter.

4. A rebar stirrup bender according to claim 1, characterized in that, The second curved portion is axially parallel to the first curved portion and is fixed by welding.

5. A rebar stirrup bender according to claim 1, characterized in that, The end face of the second curved portion away from the second sleeve end hole is coplanar with the end face of the first curved portion where the first sleeve end hole is located.

6. A rebar stirrup bender according to claim 1, characterized in that, The gripping part is integrally formed with the first curved part.

7. A rebar stirrup bender according to claim 6, characterized in that, The first curved portion is coaxially arranged with the grip portion, and the first sleeve end hole extends axially and penetrates the grip portion.

8. A rebar stirrup bender according to claim 1, characterized in that, The grip surface is uniformly covered with an anti-slip layer.

9. A rebar stirrup bender according to claim 1, characterized in that, The gripping part is provided with spiral reinforcing ribs.

10. A rebar stirrup bender according to claim 4, characterized in that, The welding area between the second curved portion and the first curved portion is provided with a double-sided weld.

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