CN216615816U - Prestressed reinforcement and prefabricated part - Google Patents
Prestressed reinforcement and prefabricated part Download PDFInfo
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- CN216615816U CN216615816U CN202122933306.0U CN202122933306U CN216615816U CN 216615816 U CN216615816 U CN 216615816U CN 202122933306 U CN202122933306 U CN 202122933306U CN 216615816 U CN216615816 U CN 216615816U
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Abstract
The utility model provides a prestressed steel bar and a prefabricated part, wherein the prestressed steel bar comprises a steel bar main body, one end of the steel bar main body is provided with an upsetting cap, and the other end of the steel bar main body is provided with a thread or an upsetting cap; the minimum diameter of the upsetting cap is larger than or equal to the diameter of the steel bar body; the top of the heading cap is provided with a boss. The utility model can firstly counteract a part of impact force when the end part of the steel bar is impacted by external load, and avoid the damage of the steel bar heading, thereby improving the quality of the prestressed steel bar.
Description
Technical Field
The utility model relates to the technical field of building engineering, in particular to a prestressed reinforcement and a prefabricated part.
Background
With the improvement of the importance degree of modern buildings and the continuous increase of the building height, higher requirements are put forward on the bearing capacity of the foundation, the natural foundation cannot better bear the load transmitted by the upper buildings, concrete piles are used as foundation piles of the foundation, and the piles are pressed into the ground by a pile pressing machine to form foundation piles, so that the upper parts of the foundation piles bear the buildings. Most precast concrete piles are prestressed piles, and anchor end plates are arranged at two ends of the piles and mainly used for anchoring prestressed steel bars after being tensioned, so that the performance of the prestressed steel bars becomes the key for ensuring the performance of the precast piles.
The upsetting cap of the prestressed reinforcement in the prior art is generally cylindrical, and although the shape is convenient to manufacture, due to the limitation of the shape, the reinforcement is pulled after being assembled, stress concentration easily occurs at the clamping joint of the upsetting cap and the end plate, so that the necking of the upsetting cap is damaged, the quality of the pile body reinforcement is damaged, and adverse effects are caused on the stability of the precast pile.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a prestressed steel bar and a prefabricated part, wherein the boss is arranged, so that when the end part of the steel bar is impacted by external load, a part of impact force can be counteracted firstly, the steel bar upsetting cap is prevented from being damaged, and the quality of the prestressed steel bar is improved.
The present invention achieves the above-described object by the following technical means.
The prestressed steel bar comprises a steel bar main body, wherein one end of the steel bar main body is provided with an upsetting cap, and the other end of the steel bar main body is provided with a thread or an upsetting cap; the minimum diameter of the upsetting cap is larger than or equal to the diameter of the steel bar main body; the top of the heading cap is provided with a boss.
Furthermore, a plurality of continuous spiral grooves are uniformly distributed on the outer surfaces of the steel bar main body and the upsetting cap in the circumferential direction.
Further, the helix angle of the spiral groove is 35-60 degrees.
Further, the boss is cylindrical or truncated cone-shaped.
Further, the height of the boss is 0.1 mm-10 mm.
Furthermore, a circumferential groove is arranged on the outer side of the boss and surrounds the boss.
Further, the width of the circumferential groove is 0.1-5 mm.
Further, the upsetting cap is divided into an upper convex part and a lower concave part by taking the maximum cross-sectional area as a plane, the lower concave part is connected with the steel bar main body, and the ratio of the height of the upper convex part to the height of the lower concave part is 1/8-1/2.
Further, the radial variation dy of the lower concave part and the height variation dh of the lower concave part are linearly decreased.
Further, the concave portion is tapered, and the taper angle θ is 20 ° to 75 °.
Further, the ratio of the height h of the upsetting cap to the maximum diameter of the upsetting cap is 1-2.7, and the ratio of the height h of the upsetting cap to the diameter of the minimum end of the upsetting cap is 2-6.0.
Further, the radial variation dy of the lower concave part and the height variation dh of the lower concave part are decreased in a non-linear way, and the dy/dh is gradually increased along with the increase of the height.
Further, a sealing device is arranged on the upsetting cap and is made of a non-metal material capable of bearing more than 60 degrees.
Furthermore, two ends of the steel bar body are respectively provided with an upsetting cap, the radial change dy of the lower concave part of the upsetting cap at one end of the steel bar body and the height change dh of the lower concave part are linearly decreased, the radial change dy of the upsetting cap at the other end of the steel bar body and the height change dh of the lower concave part are nonlinearly decreased, and the dy/dh is gradually increased along with the increase of the height.
A prefabricated component comprises the prestressed reinforcement.
The utility model has the beneficial effects that:
1. the advantage of one end with the upsetting cap and the other end with the thread is that the form of the thread is arranged, so that the anchoring form of the pile end is more flexible, a sleeve with lower cost can be used, and the sleeve can be adjusted by combining the actual situation of the project, thereby saving the manufacturing cost; when the threaded end of the steel bar is arranged on the pile top, the connection between the pile top and the bearing platform can be connected with the threaded steel wire of the bearing platform after the sleeve is connected with the thread on the steel bar through the thread, so that the connection between the pile top and the bearing platform is more convenient.
2. According to the prestressed reinforcement, the lug boss is arranged, so that when the end part of the reinforcement is impacted by external load, a part of impact force can be counteracted, the reinforcement upsetting cap is prevented from being damaged, and the quality of the prestressed reinforcement is improved.
3. According to the prestressed reinforcement, the annular groove is formed in the outer side of the boss, so that a buffering space for collapsing is reserved in the process that the boss on the upset receives impact.
4. According to the prestressed reinforcement, the minimum diameter of the upsetting cap is larger than or equal to the diameter of the reinforcement body, the maximum cross-sectional area is taken as a plane to divide the upsetting cap into the upper convex part and the lower concave part, so that the stress concentration phenomenon generated by the upsetting cap in the tensioning process of the reinforcement is effectively reduced, the deformation of the upsetting cap at the joint of the upsetting cap and the reinforcement body is effectively avoided, and the tensile property of the reinforcement is improved.
5. According to the prestressed reinforcement, the structural shape of the upsetting cap is set, so that the contact area between the reinforcement upsetting cap and an external steel part is increased, and the anchoring performance of the reinforcement is effectively improved.
6. According to the prestressed reinforcement, the lower concave part of the upsetting cap is conical through the arrangement of the linear-changing lower concave part of the upsetting cap, so that the stress concentration phenomenon generated by the upsetting cap in the tensioning process of the reinforcement can be effectively reduced, the deformation of the upsetting cap at the joint of the upsetting cap and the reinforcement body is effectively avoided, and the tensile property of the reinforcement is improved.
7. According to the prestressed reinforcement, the lower concave part of the upsetting cap in the nonlinear change is arranged, so that the upsetting cap can bear larger instant impact force, and the sudden deformation of the joint of the upsetting cap and the reinforcement body can be responded.
8. According to the prestressed steel bar, the two ends of the steel bar main body are respectively provided with the upsetting caps, one end of the steel bar main body is provided with the lower upsetting cap concave part with linear change, and the other end of the steel bar main body is provided with the lower upsetting cap concave part with non-linear change, so that the stress concentration phenomenon generated by the upsetting caps and the larger instant impact force borne by the upsetting caps can be simultaneously responded.
Drawings
Fig. 1 (a) and (b) are three-dimensional views of a prestressed reinforcement according to example 1 of the present invention.
Fig. 2 is a front view of a prestressed reinforcement according to embodiment 1 of the present invention.
Fig. 3 is a top view of fig. 2.
Fig. 4 is a bottom view of fig. 2.
Fig. 5 is a three-dimensional view of a prestressed reinforcement according to embodiment 2 of the present invention.
Fig. 6 is a front view of a prestressed reinforcement according to embodiment 2 of the present invention.
FIG. 7a is a schematic view of the linear change of the profile of the concave portion according to the present invention.
FIG. 7b is a schematic view of the non-linear change of the shape of the concave portion according to the present invention.
Fig. 8 is a front view of a prestressed reinforcement according to embodiment 3 of the present invention.
FIG. 9 is a front view of a prefabricated part according to embodiment 4 of the present invention.
FIG. 10 is a front view of a prefabricated part according to embodiment 5 of the present invention.
In the figure:
1-a steel bar main body; 1-1-spiral groove; 1-2-upsetting a cap; 1-3-circumferential groove; 1-4-boss; 1-5-upper convex part; 1-6-undercut; 2, pile body; 3-end plate.
Detailed Description
The utility model will be further described with reference to the following figures and specific examples, but the scope of the utility model is not limited thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The prestressed reinforcement described in embodiment 1, as shown in fig. 1 and 2, includes a reinforcement body 1, an upsetting cap 1-2 is provided at one end of the reinforcement body 1, and a thread is provided at the other end of the reinforcement body 1; and the steel bar main body and the upsetting cap 1-2 are in smooth transition. The minimum diameter of the upsetting cap 1-2 is larger than or equal to the diameter of the steel bar body, and the upsetting cap 1-2 is a revolving body with gradually changed diameter, and the diameter of one end, contacting the steel bar body, of the upsetting cap 1-2 is close to or the same as the diameter of the steel bar body.
As shown in figures 1 and 2, a plurality of continuous spiral grooves 1-1 are uniformly distributed on the outer surfaces of the steel bar body 1 and the upsetting cap 1-2 in the circumferential direction. The continuous spiral groove 1-1 can be understood as a spiral groove 1-1 formed on the outer surface of the steel bar body, a spiral groove 1-1 formed on the outer surface of the upsetting cap 1-2, and the spiral groove 1-1 formed on the outer surface of the upsetting cap 1-2 and the spiral groove 1-1 formed on the outer surface of the steel bar body are communicated with each other and still maintain a spiral shape, as shown in fig. 2 and 4. The spiral angle of the spiral groove 1-1 is 35-60 degrees.
As shown in FIGS. 2 and 3, a boss 1-4 is arranged at the top of the upsetting cap 1-2, a circumferential groove 1-3 is arranged outside the boss 1-4, and the circumferential groove 1-3 surrounds the boss 1-4. The bosses 1-4 are cylindrical or truncated cone-shaped. When the end part of the reinforcing steel bar is impacted by external load, the upsetting cap 1-2 is directly contacted with external impact force due to the axial deformation of the connecting plate and concrete, at the moment, the boss 1-4 can firstly counteract a part of the impact force, and the upsetting cap 1-2 is prevented from being damaged, so that the connection quality of the main reinforcing steel bar is influenced. The outer side of the boss 1-4 is provided with a circumferential groove 1-3, and the boss is provided with a crumple buffer space during impact. The boss 1-4 is cylindrical, the height of the boss 1-4 is 0.1 mm-10 mm, and the outer diameter of the boss 7-4 is 6.5 mm-14 mm; the boss 1-4 is in a round table shape, the height of the boss 1-4 is 0.1 mm-10 mm, the maximum outer diameter of the boss 1-4 is 6.5 mm-14 mm, and the minimum outer diameter of the boss 1-4 is 4.5 mm-12.6 mm; the width of the circumferential groove 1-3 is 0.1 mm-5 mm.
As shown in FIG. 2, the upsetting cap 1-2 is divided into an upper convex part 1-5 and a lower concave part 1-6 by taking the maximum cross-sectional area as a plane, the lower concave part 1-6 is connected with the steel bar body, the lower concave part 1-6 can be regarded as a smooth transition section gradually changing from the maximum cross-sectional area to the steel bar body, the upper part of the upper convex part 1-5 is provided with a boss 1-4 and a circumferential groove 1-3, and the ratio of the height of the upper convex part 1-5 to the height of the lower concave part 1-6 is 1/8-1/2. The upper convex parts 1-5 and the lower concave parts 1-6 can effectively reduce the stress concentration phenomenon generated by the upsetting cap in the tensioning process of the steel bar, effectively avoid the deformation of the upsetting cap at the joint of the upsetting cap and the steel bar body, and improve the tensile property of the steel bar.
As shown in fig. 2 and 7a, the radial variation dy of the depressions 1-6 decreases linearly with the height variation dh of the depressions 1-6. Height h here1Is the distance from the largest cross section to the interface between the upsetting cap 1-2 and the steel bar body 1. Figure 7a shows the radial reduction of the undercut 1-6 and the height of the undercut 1-6The degree increase is inversely proportional and the radial variation dy/height variation dh is constant. The depressions 1-6 of example 1 were tapered at a taper angle θ of 20 ° to 75 °. The ratio of the height h of the upsetting cap 1-2 to the maximum diameter of the upsetting cap 1-2 is 1-2.7, and the ratio of the height h of the upsetting cap 1-2 to the diameter of the minimum end of the upsetting cap 1-2 is 2-6.0.
The thread length of the other end of the steel bar main body 1 is not less than 15mm, and the width and the depth of the thread are both greater than 1 mm. Through set up the screw thread in one end, can adapt to more anchor modes, if one end adopts end plate anchor or sleeve anchor, but in addition one end can adopt screw thread sleeve anchor or other threaded connection spare to anchor, it is more convenient.
The upsetting cap 1-2 is provided with a sealing device which is made of non-metallic materials capable of bearing more than 60 degrees. And a sealing device is arranged on the side of the upsetting cap 1-2, and the sealing device comprises a non-metallic material capable of bearing at least 60 degrees of temperature. On the one hand can prevent that the corrosion that reinforcing bar heading cap and external environment contact lead to from damaging, on the other hand can bear high temperature, prevents to take place to damage in the production process to reinforcing leakproofness.
The prestressed reinforcement of embodiment 2, as shown in fig. 5 and 6, includes a reinforcement body 1, one end of the reinforcement body 1 is provided with an upsetting cap 1-2, and the other end of the reinforcement body 1 is provided with a thread; the upsetting cap 1-2 is divided into an upper convex part 1-5 and a lower concave part 1-6 by taking the maximum cross-sectional area as a plane, and the lower concave part 1-6 is connected with the steel bar body. Different from the embodiment 1, the radial change dy of the lower concave parts 1-6 and the height change dh of the lower concave parts 1-6 are non-linearly decreased and are along with the height h1The increase dy/dh is gradually increased as shown in fig. 7 b. Height h here1Is the distance from the largest cross section to the interface between the upsetting cap 1-2 and the steel bar body 1. Fig. 7b shows that the radial decrease of the undercut 1-6 is inversely proportional to the increase of the height of the undercut 1-6, and that the radial change dy/height change dh becomes progressively larger with increasing height of the undercut 1-6, it being understood that the diameter becomes smaller more slowly with increasing height at the beginning, and then becomes increasingly smaller with increasing height.
The prestressed reinforcement described in embodiment 3, as shown in fig. 8, the prestressed reinforcement includes a reinforcement body 1, two ends of the reinforcement body 1 are respectively provided with an upset cap 1-2, a radial variation dy of an undercut 1-6 of the upset cap 1-2 at one end of the reinforcement body 1 and a height variation dh of the undercut 1-6 decrease in a linear manner, a radial variation dy of the upset cap 1-2 at the other end of the reinforcement body 1 and a height variation dh of the undercut 1-6 decrease in a non-linear manner, and dy/dh increases gradually with the increase in height.
Example 5 as shown in fig. 10, the prefabricated unit according to the present invention includes therein the prestressed reinforcement according to example 3. The two ends of the upsetting caps 1-2 penetrate through the end faces of the concrete pile body 2, and the upsetting caps 1-2 are respectively positioned in the anchor bar holes of the corresponding end plates 3.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (12)
1. The prestressed steel bar comprises a steel bar main body (1), and is characterized in that one end of the steel bar main body (1) is provided with an upsetting cap (1-2), and the other end of the steel bar main body (1) is provided with a thread or an upsetting cap (1-2); the minimum diameter of the upsetting cap (1-2) is larger than or equal to the diameter of the steel bar body.
2. The prestressed reinforcement according to claim 1, characterized in that the upset cap (1-2) is provided with a boss (1-4) at the top.
3. The prestressed reinforcement according to claim 1, wherein the outer surfaces of the reinforcement body and the upsetting cap (1-2) are circumferentially and uniformly provided with a plurality of continuous spiral grooves (1-1).
4. The prestressed reinforcement according to claim 2, characterized in that a circumferential groove (1-3) is provided outside the boss (1-4), and the circumferential groove (1-3) surrounds the boss (1-4).
5. The prestressed reinforcement according to claim 1, wherein the upset cap (1-2) is divided into an upper protrusion (1-5) and a lower recess (1-6) by taking the maximum cross-sectional area as a plane, the lower recess (1-6) is connected with the reinforcement body, and the ratio of the height of the upper protrusion (1-5) to the height of the lower recess (1-6) is 1/8-1/2.
6. The prestressed reinforcement according to claim 5, characterized in that the radial variation dy of the undercut (1-6) decreases linearly with the variation dh of the undercut (1-6).
7. Prestressed reinforcement according to claim 6, characterized in that said undercut (1-6) is tapered with a cone angle θ comprised between 20 ° and 75 °.
8. The prestressed reinforcement according to claim 7, wherein the ratio of the height h of the upsetting cap (1-2) to the maximum diameter of the upsetting cap (1-2) is 1 to 2.7, and the ratio of the height h of the upsetting cap (1-2) to the diameter of the minimum end of the upsetting cap (1-2) is 2 to 6.0.
9. The prestressed reinforcement according to claim 5, characterized in that the radial variation dy of the undercut (1-6) decreases non-linearly with the variation dh of the height of the undercut (1-6) and increases gradually with increasing height dy/dh.
10. The prestressed reinforcement according to claim 1, characterized in that said upsetting cap (1-2) is provided with a sealing means, said sealing means being a non-metallic material capable of withstanding more than 60 °.
11. The prestressed reinforcement of claim 5, wherein the two ends of the reinforcement body (1) are respectively provided with an upset cap (1-2), the radial variation dy of the undercut (1-6) of the upset cap (1-2) at one end of the reinforcement body (1) and the height variation dh of the undercut (1-6) decrease linearly, the radial variation dy of the upset cap (1-2) at the other end of the reinforcement body (1) and the height variation dh of the undercut (1-6) decrease nonlinearly, and the variation dy/dh increases gradually with the increase in height.
12. A prefabricated component comprising therein the prestressed reinforcement according to any one of claims 1 to 11.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122933306.0U CN216615816U (en) | 2021-11-26 | 2021-11-26 | Prestressed reinforcement and prefabricated part |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122933306.0U CN216615816U (en) | 2021-11-26 | 2021-11-26 | Prestressed reinforcement and prefabricated part |
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| CN216615816U true CN216615816U (en) | 2022-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115749139A (en) * | 2022-12-22 | 2023-03-07 | 贝正南京工程技术有限公司 | Prestressed carbon fiber bar with two-end conical anchoring end and manufacturing method thereof |
-
2021
- 2021-11-26 CN CN202122933306.0U patent/CN216615816U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115749139A (en) * | 2022-12-22 | 2023-03-07 | 贝正南京工程技术有限公司 | Prestressed carbon fiber bar with two-end conical anchoring end and manufacturing method thereof |
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