A new type of reinforcement and anchorage assembly

Abstract

The utility model discloses a novel reinforcing steel bar and anchorage assembly, including the pole body, the maximum cross section area perpendicular to its axis is S1, the pier head is set up in one end of the pole body at least, the maximum cross section area perpendicular to the pole body axis of the pier head is S2, and the S2 is at least 2 times of the S1, and the anchorage is used for clamping the pier head, and the anchorage includes: first fastener is equipped with the first clamping cavity that the pier head is put into and first assembly cavity, and second fastener is equipped with the second clamping cavity that the pier head is put into and first assembly pin, wherein, when first assembly pin inserts first assembly cavity, the first fastener and the second fastener constitute the closed clamping structure that surrounds the pier head, when the first fastener and the second fastener are spliced, the first clamping cavity and the second clamping cavity jointly constitute the clamping chamber that adapts to the pier head outer contour. The utility model can guarantee the safety of tensioning reinforcing steel bar to some extent.

Description

Technical Field

[0001] This utility model relates to the field of steel bar production technology, and in particular to a novel steel bar and anchor assembly. Background Technology

[0002] Prestressed steel bars are special steel bars used in civil engineering for prestressed concrete structures. Prestressed steel bars enhance the performance of concrete structures by applying tensile stress beforehand: before the concrete member bears external loads, high-strength tensile stress is applied to the steel bars through mechanical tensioning, thus subjecting the concrete to compressive stress beforehand.

[0003] However, existing anchoring technologies have certain drawbacks: traditional clamping methods rely on the surface morphology of the reinforcing bars, such as surface ribs. During tensioning, contact stress concentration can easily lead to slippage of the wedges or anchoring failure; threaded connections weaken the strength of the threaded pair and have poor corrosion resistance, while welding causes heat-affected zone damage and reduces fatigue performance.

[0004] Therefore, it is necessary to develop a new type of steel bar to meet the performance requirements of steel bar mechanical tensioning. Utility Model Content

[0005] To address the above issues and overcome the shortcomings of existing technologies, this utility model provides a novel rebar and anchor assembly. This utility model features end caps at both ends of the rod body. The cross-sectional area of ​​the end caps is larger than that of the rod body, making them easier to clamp. The anchor for clamping the end caps is designed as a detachable first fastener and a second fastener. The first fastener has a first assembly cavity; the second fastener has a first assembly pin. The first assembly pin is inserted into the first assembly cavity to complete the assembly of the first and second fasteners. Furthermore, the first fastener has a first clamping cavity for inserting the end cap; the second fastener has a second clamping cavity for inserting the end cap. The first and second clamping cavities together form a space that allows the end cap to be inserted, thus enabling the anchor to firmly enclose the end cap and ensuring safety during the rebar tensioning process.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The rod has a maximum cross-sectional area S1 perpendicular to its axis;

[0008] A pier head, at least one of which is disposed at one end of the rod body; the maximum cross-sectional area of ​​the pier head perpendicular to the axis of the rod body is S2; and S2 is at least twice the size of S1.

[0009] Anchorage for holding the pier head; the anchorage includes:

[0010] The first fastener has a first clamping cavity for the insertion of the pier head, and a first assembly cavity;

[0011] The second fastener has a second clamping cavity for the pier head to be inserted and a first assembly pin.

[0012] in,

[0013] When the first assembly pin is inserted into the first assembly cavity, the first fastener and the second fastener form a closed clamping structure surrounding the pier head.

[0014] When the first fastener and the second fastener are assembled, the first clamping cavity and the second clamping cavity together form a clamping chamber that is adapted to the outer contour of the pier head.

[0015] Furthermore, the cross-section of the pier head perpendicular to the axis of the pole is a variable cross-section, and the cross-sectional area of ​​the side of the pier head away from the pole is smaller than the cross-sectional area of ​​the side closer to the pole.

[0016] Furthermore, the pier head further includes:

[0017] The first shear-resistant part is cylindrical, and one end face of it is connected to the end face of the rod body;

[0018] The second shear-resistant part is truncated cone-shaped, and its larger bottom surface is connected to the end face of the first shear-resistant part that is away from the rod body.

[0019] Furthermore, the cross-section of the pier head perpendicular to the axis of the pole is a variable cross-section, and the cross-sectional area of ​​the side of the pier head away from the pole is larger than the cross-sectional area of ​​the side closer to the pole.

[0020] Furthermore, the pier head further includes:

[0021] The third shear-resistant section is tower-shaped and consists of multiple stacked cylinders; the cylinders are arranged in ascending order of diameter away from the rod.

[0022] Furthermore, there is an interference fit of 0.05-0.3 mm between the mating surfaces of the first assembly pin and the first assembly cavity.

[0023] Furthermore, the first fastener is also provided with a second assembly cavity, which is located on the side of the first clamping cavity near the rod body;

[0024] The second fastener is further provided with a second mounting pin, which is located on the side of the first mounting pin near the rod.

[0025] in,

[0026] The second assembly pin can be inserted into the second assembly cavity.

[0027] Furthermore, there is an interference fit of 0.05-0.3 mm between the second assembly pin and the mating surface of the second assembly cavity.

[0028] Furthermore, the first fastener has a first lifting ring at the end away from the rod; the first lifting ring is used to pull the first fastener.

[0029] Furthermore, the second fastener has a second lifting ring at the end away from the rod; the second lifting ring is used to pull the second fastener.

[0030] This utility model has at least the following advantages or beneficial effects:

[0031] This invention features end caps at both ends of the rod, with the end caps having a larger cross-sectional area than the rod itself, making them easier to clamp. The anchorage for clamping the end caps consists of a detachable first fastener and a second fastener. The first fastener has a first assembly cavity; the second fastener has a first assembly pin. The first assembly pin is inserted into the first assembly cavity to complete the assembly of the first and second fasteners. Furthermore, the first fastener has a first clamping cavity for inserting the end cap; the second fastener has a second clamping cavity for inserting the end cap. The first and second clamping cavities together form a space that allows the end cap to be inserted, thus enabling the anchorage to securely enclose the end cap and ensure safety during the tensioning of the reinforcing steel.

[0032] This invention improves the anchorage reliability of prestressed steel bars to a certain extent through geometric reinforcement of the pier head structure and the design of a split anchor. The maximum cross-sectional area of ​​the pier head is at least twice that of the bar body, expanding the stress-bearing area of ​​the anchor and reducing the risk of slippage of traditional clamping plates. Simultaneously, the anchor adopts a closed structure formed by the combination of the first and second fasteners, with its internal clamping cavity enclosing the outer contour of the pier head, achieving uniform stress distribution and mitigating brittle failure caused by localized stress concentration. This collaborative design is not only suitable for straight steel bars but also effectively adaptable to various variable cross-section pier head shapes.

[0033] This invention further optimizes shear resistance and assembly efficiency. For the pier head structure, the conical surface of the frustum-shaped shear-resistant part generates a radial self-locking effect, and the stepped tower-shaped shear-resistant part forms a multi-level shear barrier, making shear load transfer more stable and efficient. The anchorage adopts an interference-fit pin assembly system, achieving rapid locking through precisely controlled interference. The double-pin assembly structure enhances torsional stiffness while ensuring the load transfer path remains aligned during tensioning, reducing the risk of construction deviations. Furthermore, the first and second lifting rings on the pier head facilitate connections between equipment during rebar tensioning. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a structural diagram of the assembly of a new type of reinforcing bar and anchorage component;

[0036] Figure 2 A diagram of a novel reinforced concrete structure for a pier head containing a first shear-resistant section and a second shear-resistant section;

[0037] Figure 3 Here is a structural diagram of the first fastener;

[0038] Figure 4 This is a structural diagram of the second fastener.

[0039] Figure 5 This is a diagram of a new type of reinforced concrete structure for a pier head containing a third shear-resistant section.

[0040] Figure label:

[0041] 1- Rod;

[0042] 2-Head; 21-First shear-resistant section; 22-Second shear-resistant section; 23-Third shear-resistant section;

[0043] 3-Anchor; 31-First fastener; 311-First clamping cavity; 312-First assembly cavity; 313-Second assembly cavity; 314-First lifting ring; 32-Second fastener; 321-Second clamping cavity; 322-First assembly pin; 323-Second assembly pin; 324-Second lifting ring. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship of the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limiting this utility model.

[0048] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0049] The embodiments of this utility model will be described in detail below.

[0050] Example 1:

[0051] This utility model discloses a novel rebar and anchor assembly. In this embodiment, piers 2 are provided at both ends of the rod 1. The cross-sectional area of ​​the piers 2 is larger than that of the rod 1, making them easier to clamp. The anchor 3 clamping the piers 2 is designed as a detachable first fastener 31 and a second fastener 32. The first fastener 31 has a first assembly cavity 312; the second fastener 32 has a first assembly pin 322. The first assembly pin 322 is inserted into the first assembly cavity 312 to complete the assembly of the first fastener 31 and the second fastener 32. Furthermore, the first fastener 31 has a first clamping cavity 311 for inserting the piers 2; the second fastener 32 has a second clamping cavity 321 for inserting the piers 2. The first clamping cavity 311 and the second clamping cavity 321 together form a space that allows the piers to be inserted, thus the anchor 3 can firmly wrap the piers 2, thereby ensuring safety during the rebar tensioning process. Details are as follows:

[0052] Figure 1 This is a schematic diagram showing the assembly of the first fastener 31 and the second fastener 32 onto the anchor head 2. As can be seen from the diagram, the anchor 3 in this embodiment consists of a first fastener 31 and a second fastener 32. During use, the first fastener 31 and the second fastener 32 clamp the anchor head 2 at the end of the rod 1 to facilitate tensioning of the rod 1.

[0053] Figure 2This is a structural schematic diagram of the new type of reinforcing steel. As shown in the diagram, the new reinforcing steel includes a rod 1, with a cap 2 at one end. In practice, caps 2 can be provided at both ends of the rod 1 to facilitate tensioning operations. Furthermore, the maximum cross-sectional area of ​​the rod 1 perpendicular to its axis is S1.

[0054] The pier head 2 at the end of the rod 1 consists of two parts: a first shear-resistant part 21 and a second shear-resistant part 22. The first shear-resistant part 21 is cylindrical and coaxial with the rod 1, thus preventing eccentricity from affecting construction quality when tensioning the rod 1 through the pier head 2. The maximum cross-sectional area of ​​the first shear-resistant part 21 perpendicular to the axis of the rod 1 is S2, which is at least twice the size of S1, facilitating the clamping of the pier head 2 by the anchor 3. The second shear-resistant part 22 is frustum-shaped, with its larger base surface connected to the end face of the first shear-resistant part furthest from the rod. The first shear-resistant part 21 allows the pier head 2 to be subjected to a uniformly distributed axial load along the circumference; the second shear-resistant part 22 decomposes the load transmitted from the first shear-resistant part 21 into radial and axial components, thus mitigating stress abrupt changes in the pier head 2 to some extent.

[0055] Figure 3 , Figure 4 These are schematic diagrams of the first fastener 31 and the second fastener 32. As can be seen from the diagrams, the first fastener 31 has a first clamping cavity 311 and the second fastener 32 has a second clamping cavity 321. The first clamping cavity 311 and the second clamping cavity 321 together form a space that allows the pier head to be inserted. Therefore, the anchor can firmly wrap the pier head, thereby ensuring the safety during the tensioning of the reinforcing steel.

[0056] The first fastener 31 has a first assembly cavity 312, which is located on the side of the first clamping cavity 311 away from the rod 1 and is semi-circular in shape. The second fastener 32 has a first assembly pin 322, which is located on the side of the second clamping cavity 321 away from the rod 1 and has a shape corresponding to the first clamping cavity 311. To ensure that the first assembly pin 322 is securely inserted into the first assembly cavity 312, there is an interference fit of 0.05-0.3 mm between the mating surfaces of the first assembly pin 322 and the first assembly cavity 312. Therefore, the first assembly cavity 312 and the first assembly pin 322 are in an interference fit state, which to a certain extent ensures the integrity of the anchor 3 during the tensioning operation.

[0057] The first fastener 31 also has two second assembly cavities 313, both located on the side of the first clamping cavity 311 near the rod 1, and respectively on both sides of the first clamping cavity 311. The second fastener 32 also has two second assembly pins 323, both located on the side of the second clamping cavity 321 near the rod 1, and respectively on both sides of the second clamping cavity 321. To ensure that the second assembly pins 323 are securely inserted into the second assembly cavities 313, there is an interference fit of 0.05-0.3mm between the mating surfaces of the second assembly pins 323 and the second assembly cavities 313. Therefore, the second assembly pins 323 and the second assembly cavities 313 are in an interference fit state. In this way, not only is the integrity of the anchor 3 ensured during the tensioning operation, but also the continuity of stress transmission between the anchor and the pier head during the tensioning process, further enhancing the integrity of the anchor 3 and the pier head 2 during the tensioning operation.

[0058] In addition, the first fastener 31 is provided with a first lifting ring 314 on the side away from the rod 1; the second fastener 32 is provided with a second lifting ring 324 on the side away from the rod 1. When the first fastener 31 and the second fastener 32 are assembled, the first lifting ring 314 and the second lifting ring 324 are combined into a whole, providing a connection foundation for the prestressed tensioning equipment to facilitate tensioning operations.

[0059] During the production process, the end cap 2 of the rod body 1 can be made into an austenitic state by heating the end of the steel bar to above the phase transformation point of the steel (e.g., 1150±50℃ for HRB500 steel), and then axially upsetting is carried out by a hydraulic press (pressure ≥300MPa) or an electric upsetting machine, and finally shaped by temperature-controlled cooling. In this embodiment, the first shear-resistant part 21 and the second shear-resistant part 22 can be formed by combining a 60° conical die and a flat punch die.

[0060] During the tensioning process, hydraulic jacks can be used as the tensioning equipment. The output end of the hydraulic jacks is connected to the first lifting ring 314 and the second lifting ring 324 before tensioning is performed. After tensioning is completed, the anchor 3 can be removed from the outside of the pier head 2 according to the actual situation to facilitate the recycling of the anchor 3; alternatively, the anchor 3 can remain unremoved, allowing the anchor 3, pier head 2, and rod body 1 to share the load during use.

[0061] Example 2:

[0062] The difference between this embodiment 2 and embodiment 1 is that the structure of the end cap 2 at the end of the rod 1 is different.

[0063] Figure 5This is a schematic diagram of the structure of the new type of reinforcing steel. As shown in the diagram, the new reinforcing steel includes a rod 1, with a head 2 at one end. In practice, both ends of the rod 1 can have heads 2 to facilitate tensioning operations. Furthermore, the maximum cross-sectional area of ​​the rod 1 perpendicular to its axis is S1. In this embodiment, the head 2 is a third shear-resistant part 23 formed by stacking multiple cylinders in a tower shape. The cylinders have different diameters but are all coaxial with the rod 1. The cylinders are stacked sequentially from the end of the rod 1 outwards, with their diameters gradually increasing. Therefore, the position of the largest cross-sectional area is located at the cylinder furthest from the rod 1. In this embodiment, the third shear-resistant part 23 includes four cylinders. The diameter difference between adjacent cylinders is 10 mm.

[0064] During the production process, the end cap 2 at the end of the rod 1 can be heated to above the phase transformation point of the steel (e.g., 1150±50℃ for HRB500 steel) to bring it to an austenitic state. Then, it is axially upset using a hydraulic press (pressure ≥300MPa) or an electric upsetting machine, and finally cooled and shaped under controlled temperature. In this embodiment, the third shear-resistant part 23 can be formed through multi-stage stepped mold cavity molding.

[0065] The third shear-resistant section 23 can distribute the total shear force to multiple independent shear-resistant units, thereby reducing the peak shear stress. The local plastic deformation at its stepped edges can form an energy dissipation mechanism, which can be used to absorb vibration loads, thus extending the service life of the structure.

[0066] Compared with Example 1, this embodiment is the same in all aspects except for the pier head 2.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A novel steel bar and anchor assembly, characterized in that, include: The rod (1) has a maximum cross-sectional area S1 perpendicular to its axis; A pier head (2), at least one of which is disposed at one end of the rod body (1); the maximum cross-sectional area of ​​the pier head (2) perpendicular to the axis of the rod body (1) is S2; the S2 is at least twice the S1; Anchor (3) for clamping the pier head (2); the anchor (3) includes: The first fastener (31) has a first clamping cavity (311) for the pier head (2) to be inserted, and a first assembly cavity (312). The second fastener (32) is provided with a second clamping cavity (321) for the pier head (2) to be inserted and a first assembly pin (322). in, When the first assembly pin (322) is inserted into the first assembly cavity (312), the first fastener (31) and the second fastener (32) form a closed clamping structure surrounding the pier head (2); When the first fastener (31) and the second fastener (32) are assembled, the first clamping cavity (311) and the second clamping cavity (321) together form a clamping chamber that is adapted to the outer contour of the pier head (2).

2. The novel steel bar and anchor assembly according to claim 1, characterized in that, The cross section of the pier head (2) perpendicular to the axis of the rod (1) is a variable cross section, and the cross section area of ​​the side of the pier head (2) away from the rod (1) is smaller than the cross section area of ​​the side closer to the rod (1).

3. The novel steel bar and anchor assembly according to claim 2, characterized in that, The pier head (2) further includes: The first shear-resistant part (21) is cylindrical, and one end face of it is connected to the end face of the rod (1); The second shear-resistant part (22) is frustum-shaped, and its larger bottom surface is connected to the end face of the first shear-resistant part (21) away from the rod (1).

4. The novel steel bar and anchor assembly according to claim 1, characterized in that, The cross section of the pier head (2) perpendicular to the axis of the rod (1) is a variable cross section, and the cross section area of ​​the side of the pier head (2) away from the rod (1) is greater than the cross section area of ​​the side closer to the rod (1).

5. The novel steel bar and anchor assembly according to claim 4, characterized in that, The pier head (2) further includes: The third shear-resistant part (23) is tower-shaped and is composed of multiple stacked cylinders; the multiple cylinders are arranged in order of increasing diameter away from the rod (1).

6. The novel steel bar and anchor assembly according to claim 1, characterized in that, The first assembly pin (322) and the mating surface of the first assembly cavity (312) have an interference of 0.05-0.3 mm.

7. The novel steel bar and anchor assembly according to claim 1, characterized in that: The first fastener (31) is also provided with a second assembly cavity (313), which is located on the side of the first clamping cavity (311) near the rod body; The second fastener (32) is also provided with a second mounting pin (323), which is located on the side of the first mounting pin (322) near the rod body; in, The second assembly pin (323) can be inserted into the second assembly cavity (313).

8. The novel steel bar and anchor assembly according to claim 7, characterized in that, The second assembly pin (323) has an interference fit of 0.05-0.3 mm with the mating surface of the second assembly cavity (313).

9. The novel steel bar and anchor assembly according to claim 1, characterized in that, The first fastener (31) has a first lifting ring (314) at the end away from the rod (1); the first lifting ring (314) is used to pull the first fastener (31).

10. The novel steel bar and anchor assembly according to claim 1, characterized in that, The second fastener (32) has a second lifting ring (324) at the end away from the rod (1); the second lifting ring (324) is used to pull the second fastener (32).

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