Lengthened anchoring connecting plate and prestressed anchorage device

Abstract

This utility model relates to the technical field of components used in prestressed structures, and particularly to extended anchorage connection plates and prestressed anchorages. This utility model improves upon existing prestressed anchorages by optimizing the structure of the extended anchorage connection plate. The threading hole for the extended reinforcement is configured as a structure including a conical hole section adapted to a wedge-shaped clamp and a clamp wedge-tightening screw hole section located inside the conical hole section. This allows for the installation of the wedge-tightening clamp within the conical hole section. Simultaneously, by tightening the wedge-shaped clamp with a wedge-tightening anti-loosening nut within the clamp wedge-tightening screw hole section, the wedge-shaped clamp effectively grips the inner end of the outer steel strand. This achieves clamp-type anchorage even in space-constrained conditions, improving the anchorage reliability and tensile strength of the outer steel strand.

Description

Technical Field

[0001] This utility model relates to the field of components used in prestressed structures, and particularly to extended anchorage connection plates and prestressed anchorages. Background Technology

[0002] Prestressed anchors are a type of building reinforcement commonly used in infrastructure construction. Traditional prestressed anchors, such as those disclosed in Chinese invention patent application CN117005695A, include an anchor plate, a spiral reinforcement inside the anchor plate, and an anchor ring integrally connected (or separately supported) to the outside of the anchor plate. The anchor ring has multiple inner reinforcement threading holes, through which the outer ends of the inner steel strands pass. Wedge-shaped clamps are installed in the inner reinforcement threading holes to hold the outer ends of the inner steel strands, thus achieving an anti-detachment connection between the inner steel strands and the anchor ring.

[0003] In actual engineering construction, there are situations where it is necessary to extend prestressing tendons. The applicant has proposed a prestressed anchorage capable of extending prestressing tendons. For example... Figure 1 As shown, the structure includes an anchor plate 6, a spiral reinforcement 7, and an anchor ring for anchoring the inner steel strand 3. The anchor ring has a larger diameter than those in the prior art. The anchor ring extends the anchoring connecting plate 1. An extension reinforcement threading hole is added to the anchor ring around the original inner reinforcement threading hole. The outer steel strand 2, which needs to be extended, passes through the extension reinforcement threading hole. Due to the limited space between the anchor ring and the anchor plate 6, the inner end of the outer steel strand 2 is anchored to the anchor ring via a compression sleeve 5 to prevent detachment. A trumpet sleeve 8 is installed on the outer side of the anchor ring, which completely houses the outer steel strand 2. An inner ring sleeve 9 is provided on the inner side of the anchor ring, clamped between the front end face of the anchor plate and the inner end face of the anchor ring. The inner steel strand 3 passes through the inner side of the inner ring sleeve 9, and the inner end of the outer steel strand 2 is located outside the inner ring sleeve 9.

[0004] The prestressed anchorage was lengthened by using the original inner steel strands and the outer steel strands extended through the anchoring connection plate to meet the operating conditions. However, in actual use, it was found that the anchoring between the inner end of the outer steel strand and the anchoring connection plate by the extrusion sleeve was not reliable enough, and the tensile strength of the outer steel strand was limited. Utility Model Content

[0005] The purpose of this invention is to provide an extended anchorage connecting plate to solve the problem that the existing extended anchorage connecting plate structure, which anchors the outer steel strand to it through an extrusion sleeve, lacks reliability and limits the tensile strength of the outer steel strand. Simultaneously, this invention also aims to provide a prestressed anchor to solve the same problem.

[0006] The extension anchoring connection plate of this utility model includes a main body, which includes a middle plate and an outer plate surrounding the middle plate. The middle plate has an inner reinforcing bar threading hole for the inner steel strand to pass through, and the outer plate has an extension reinforcing bar threading hole for the outer steel strand to pass through. The extension reinforcing bar threading hole includes a conical hole section adapted to the wedge-shaped clamp to allow the wedge-shaped clamp to hold and anchor the inner end of the outer steel strand. The extension reinforcing bar threading hole also includes a clamping screw hole section located inside the conical hole section for the wedge-tightening anti-loosening nut to be screwed in to tighten the wedge-shaped clamp.

[0007] Furthermore, the inner diameter of the wedge-tightening screw hole section is larger than the inner diameter of the large diameter end of the tapered hole section, and a positioning step is formed at the junction of the two to position the wedge-tightening anti-loosening nut.

[0008] Furthermore, the outer surface of the outer plate is an annular plane, and the wedge-tightening screw hole section of the clamping piece is coaxial with the tapered hole section and the axis is inclined relative to the normal of the annular plane so that the outer steel strand can extend straight through.

[0009] Furthermore, the inner surface of the outer plate is an annular spherical surface or an annular conical surface, and the axis of the threading hole of the extension bar extends along the normal of the annular spherical surface or annular conical surface.

[0010] Furthermore, the angle between the axis of the threaded hole of the extension bar and the normal of the annular plane is equal to or less than 4°.

[0011] This invention improves upon existing extension anchoring connection plates by setting the extension bar threading hole to include a conical hole section adapted to the wedge-shaped clamp and a clamp wedge tightening screw hole section located inside the conical hole section. This allows the wedge clamp to be installed in the conical hole section, and the wedge clamp is tightened by screwing a wedge tightening anti-loosening nut into the clamp wedge tightening screw hole section. Instead, the wedge clamp hugs the inner end of the outer steel strand, thus achieving clamp-type anchoring in limited space, improving the anchoring reliability of the outer steel strand, and enhancing the tensile strength of the outer steel strand.

[0012] The prestressed anchorage of this utility model includes an anchor plate, an extended anchorage connecting plate, and inner and outer steel strands anchored to the extended anchorage connecting plate. The extended anchorage connecting plate includes a main body, which includes a middle plate and an outer plate surrounding the middle plate. The middle plate has an inner reinforcing bar threading hole for the inner steel strand to pass through, and the outer plate has an extended reinforcing bar threading hole for the outer steel strand to pass through. The extended reinforcing bar threading hole includes a conical hole section adapted to a wedge-shaped clamp to allow the wedge-shaped clamp to hold the inner end of the outer steel strand. The extended reinforcing bar threading hole also includes a clamp wedge tightening screw hole section located inside the conical hole section. The prestressed anchorage also includes a wedge tightening screw hole section screwed into the wedge from the inside of the extended anchorage connecting plate to tighten the wedge-shaped clamp and hold the outer steel strand.

[0013] Furthermore, the inner diameter of the wedge-tightening screw hole section is larger than the inner diameter of the large diameter end of the tapered hole section, and a positioning step is formed at the junction of the two to position the wedge-tightening anti-loosening nut.

[0014] Furthermore, the outer surface of the outer plate is an annular plane, and the wedge-tightening screw hole section of the clamping piece is coaxial with the tapered hole section and the axis is inclined relative to the normal of the annular plane so that the outer steel strand can extend straight through.

[0015] Furthermore, the inner surface of the outer plate is an annular spherical surface or an annular conical surface, and the axis of the threading hole of the extension bar extends along the normal of the annular spherical surface or annular conical surface.

[0016] Furthermore, the angle between the axis of the threaded hole of the extension bar and the normal of the annular plane is equal to or less than 4°.

[0017] Furthermore, the wedge-tightening anti-loosening nut includes a threaded sleeve, the outer circumferential surface of which is provided with an external thread adapted to the internal thread of the wedge-tightening screw hole section of the clamping piece, the front end face of the threaded sleeve abutting the wedge-shaped clamping piece, the threaded sleeve having an inner cavity that opens toward the tapered hole section to allow the inner end of the outer steel strand to extend into during the process of abutting the wedge-shaped clamping piece, and the threaded sleeve having a screwing end on the side of the external thread away from the tapered hole section.

[0018] Furthermore, the inner diameter of the cavity is larger than the diameter of the outer steel strand.

[0019] Furthermore, the screwing end is a screwing post connected to the rear end of the threaded sleeve. The screwing post blocks the rear end of the cavity and covers the inner end of the outer steel strand inside.

[0020] Alternatively, the screwing end is a screwing post connected to the rear end of the threaded sleeve. The screwing post blocks the rear end of the cavity and presses the inner end of the outer steel strand when the wedge-shaped clamp is tightened.

[0021] This invention improves upon existing prestressed anchorages by optimizing the structure of the extended anchorage connection plate. The extension bar threading hole is configured to include a conical hole section adapted to the wedge-shaped clamp and a clamp wedge-tightening screw hole section located inside the conical hole section. This allows for the installation of the wedge-tightening clamp within the conical hole section. Simultaneously, by tightening the wedge-shaped clamp with a wedge-tightening anti-loosening nut within the clamp wedge-tightening screw hole section, the wedge-shaped clamp effectively grips the inner end of the outer steel strand. This achieves clamp-type anchorage even in limited space, improving the anchorage reliability and tensile strength of the outer steel strand. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an existing prestressed anchorage.

[0023] Figure 2This is a structural schematic diagram of one embodiment of the prestressed anchorage of this utility model;

[0024] Figure 3 for Figure 2 A structural schematic diagram of the extended anchoring connection plate from the inner side view.

[0025] Figure 4 for Figure 3 The diagram shows a half-section of the extended anchoring connection plate.

[0026] Figure 5 for Figure 2 A structural schematic diagram of the extended anchorage connection plate from the outside view.

[0027] Figure 6 This is a half-sectional view of the wedge-tightening anti-loosening nut.

[0028] In the diagram: 1. Extended anchoring connection plate; 10. Middle plate; 11. Outer plate; 100. Inner reinforcement threading hole; 111. Tapered hole section; 112. Wedge-tightening screw hole section; 2. Outer steel strand; 3. Inner steel strand; 4. Wedge; 5. Extrusion sleeve; 50. Wedge-tightening anti-loosening nut; 6. Anchor plate; 7. Spiral reinforcement; 8. Trumpet sleeve; 9. Inner ring sleeve; 501. Threaded sleeve; 502. External thread; 503. Receiving cavity; 504. Tightening end. Detailed Implementation

[0029] This invention addresses the problem of poor anchoring reliability caused by the use of compression sleeves to anchor the outer steel strand in existing prestressed anchorages due to the limited space between the extended anchorage connecting plate and the anchor pad plate. By using a threaded drive to tighten the wedge-shaped clamps, the invention achieves anchoring of the inner end of the outer steel strand in confined spaces using a clamp-type anchoring method, thus improving the anchoring effect between the outer steel strand and the extended anchorage connecting plate.

[0030] The specific implementation method of the prestressed anchorage of this utility model is as follows:

[0031] To facilitate a clear description of the technical solution, unless otherwise specified, "inner side" and "outer side" will be used below. Figure 1 The right side is the "inner side" and the left side is the "outer side". That is, the side of the reinforced soil layer facing inward is the "inner side" and the side of the reinforced soil layer facing outward is the "outer side".

[0032] like Figure 2-6As shown, the prestressed anchor includes a trumpet-shaped anchor plate 6, a spiral reinforcement 7 sleeved on the outside of the anchor plate 6, and an extension anchoring connection plate 1 located in front of the anchor plate 6. Multiple inner steel strands 3 in bundles pass through the anchor plate 6. The portion of the inner steel strands 3 located inside the anchor plate 6 extends into the reinforced soil layer and is connected to an anchoring component at its inner end. The outer end of the inner steel strands 3 passes through the inner reinforcement threading hole 100 on the extension anchoring connection plate 1 and is anchored to the extension anchoring connection plate 1 to achieve an anti-detachment connection.

[0033] The portions of the multiple inner steel strands 3 extending into the soil layer extend in parallel, while the portions within the anchor plate 6 are dispersed radially to facilitate tensioning and anchoring. Specifically, radially, the innermost strands of the bundled inner steel strands 3 maintain a straight extension and pass through the inner reinforcement threading holes 100 on the extended anchoring connection plate 1, while the outermost strands begin to diagonally spread outward from the inner end of the anchor plate 6 and pass through the inner reinforcement threading holes 100 on the extended anchoring connection plate 1. The axial extension direction of the inner reinforcement threading hole 100 provided on the extended anchoring connection plate 1 is consistent with the extension direction of the outer end of the corresponding inner steel strand 3. In this way, the outer end of each inner steel strand 3 can pass through the corresponding inner reinforcement threading hole 100 in a straight extension state, avoiding structural bending and deflection of the inner steel strand 3 at the point of passing through the inner reinforcement threading hole 100, which would affect the load-bearing and tensile strength of the inner steel strand 3 and the anchoring reliability of the anchor.

[0034] More specifically, the extended anchoring connection plate 1 includes a main plate body, which includes a central plate body 10 and an outer plate body 11 located around the central plate body 10. Inner reinforcement threading holes 100 are provided on the central plate body 10. Among the inner reinforcement threading holes 100 provided on the central plate body 10, the inner reinforcement threading holes 100 in the central region extend perpendicularly to the central plate body 10, for allowing straight lines of bundled inner steel strands 3 located radially inward to pass through. The axis of the inner reinforcement threading holes 100 located radially outward is inclined relative to the central plate body 10, so as to be consistent with the extension direction of the outer end of the inner steel strands 3 located radially outward, for allowing straight lines of bundled inner steel strands 3 located radially outward to pass through, thereby ensuring that the outer ends of each inner steel strand 3 pass through the corresponding inner reinforcement threading hole 100 in a state of maintaining straight extension.

[0035] To avoid excessive tilt angle affecting the load-bearing and tensile strength of the inner steel strand 3, the tilt angle of the axis of the inner reinforcing bar thread hole 100 located on the radial outer side (relative to the axis perpendicular to the main body) is no greater than 4°, that is, it can be 4°, 3° or 2°.

[0036] The inner reinforcing bar threading hole 100 is a conical threading hole with the large end facing outward and the small end facing inward. When anchoring the inner steel strand 3 to the extended anchoring connection plate 1, a wedge-shaped clamp 4 is installed in the conical threading hole. The wedge-shaped clamp 4 hugs the inner reinforcing bar threading hole 100 and is wedge-anchored to the hole wall of the conical threading hole.

[0037] The outer plate 11 is provided with extension bar threading holes for the outer steel strands 2 to pass through. The outer steel strands 2 pass through the extension bar threading holes from the outside and are anchored at the inner end of the passage. Considering that the extension bar threading holes are set on the outer plate 11, if the outer steel strands 2 pass through the extension bar threading holes in a straight line, the outer steel strands 2 will be relatively dispersed, resulting in poor tensile strength and occupying a large space. Therefore, the section of the outer steel strands 2 near the extension anchoring plate 1 extends radially outward and disperses, that is, it gradually converges in the direction away from the extension anchoring plate 1. The outer surface of the outer plate is an annular plane. The axis of the extension bar threading hole is inclined relative to the normal of the annular plane, and the inclination direction is opposite to the inclination direction of the inner reinforcement threading hole 100, so that the rear end of each outer steel strand 2 passes through the corresponding extension bar threading hole in a straight line.

[0038] To avoid excessive tilt angle affecting the load-bearing and tensile strength of the outer steel strand 3, the tilt angle of the axis of the splice through hole should not exceed 4°, i.e., it can be 4°, 3°, or 2°. The inner surface of the outer plate 11 is an annular spherical surface or an annular conical surface, and the axis of the splice through hole extends along the normal of the conical or spherical annular surface. This ensures that the axis of each splice through hole is parallel to the normal of the inner surface of the outer plate 11 at its location, resulting in better tensile strength.

[0039] from Figure 2-5 As can be seen, the threading holes for the extension bars and the threading holes for the inner bars are arranged in a circular array, and the circles containing the threading holes for the inner bars perpendicular to the middle plate 10, the threading holes for the inner bars inclined to the middle plate 10, and the threading holes for the extension bars are concentric rings. Of course, in some embodiments, there is one threading hole for the inner bars perpendicular to the middle plate 10, and one inner steel strand 3 extending perpendicular to the middle plate 10 and located at the center of the middle plate 10.

[0040] The prestressed anchor also includes a trumpet sleeve 8. The inner and outer ends of the trumpet sleeve 8 are both cylindrical sleeve sections. The inner end is larger and the outer end is smaller. The inner and outer ends are connected by a conical section. The inner end is fitted and fixed on the outer side of the extended anchoring connection plate 1, and the end is in contact with the end face of the anchor plate 6. The inner cavity of the trumpet sleeve 8 forms an outer grouting cavity, and a grouting joint is provided on the inner end.

[0041] The inner side of the main body is provided with an inner ring sleeve 9, which surrounds the radial outer side of all the inner steel strands 3. The inner ring sleeve 9 is clamped between the main body and the anchor plate 6, with its outer end fitting against the main body and its inner end fitting against the anchor plate 6. The inner cavity of the inner ring sleeve 9 and the inner cavity of the anchor plate 6 communicate to form an inner grouting cavity, and the anchor plate 6 is provided with a grouting channel that communicates with the inner grouting cavity.

[0042] like Figure 3-4 As shown, the extension bar threading hole includes a conical hole section 111 adapted to the wedge-shaped clamp and a clamp wedge tightening screw hole section 112 located inside the conical hole section. The conical hole section 111 and the clamp wedge tightening screw hole section 112 are coaxial. The prestressed anchor also includes a wedge tightening anti-loosening nut 50 that is screwed into the clamp wedge tightening screw hole section from the inside of the extension anchoring connection plate. When the outer steel strand is anchored to the extension anchoring connection plate, the inner end of the outer steel strand is passed through the extension bar threading hole from the outside to the inside. Then, the wedge-shaped clamp 4 is installed into the conical hole section from the inside. Then, the wedge tightening anti-loosening nut 50 is screwed into the clamp wedge tightening screw hole section 112 from the inside. The wedge tightening anti-loosening nut 50 pushes the wedge-shaped clamp against the small diameter end of the conical hole section, so that the wedge-shaped clamp hugs the outer steel strand 2, thereby achieving anti-loosening anchoring of the outer steel strand.

[0043] The inner diameter of the wedge-tightening screw hole section 112 is larger than the inner diameter of the large diameter end of the tapered hole section 111, and a positioning step is formed at the junction of the two. When the wedge-tightening anti-loosening nut 50 is screwed into the wedge-tightening screw hole section, the positioning step positions the screwing depth of the wedge-tightening anti-loosening nut 50 to ensure reliable tightening.

[0044] like Figure 6 As shown, the wedge-tightening anti-loosening nut 50 includes a threaded sleeve 501. The outer circumferential surface of the threaded sleeve 501 is provided with an external thread 502 adapted to the internal thread of the wedge-shaped clamping screw hole section. The annular front end face of the threaded sleeve 501 presses against the inner end of the wedge-shaped clamping piece. The threaded sleeve 501 has a receiving cavity 503 opening towards the tapered hole section. During the process of pressing against the wedge-shaped clamping piece, the receiving cavity 503 allows the inner end of the outer steel strand 2 to extend into it, so as to avoid the inner end of the outer steel strand 2 abutting against the wedge-tightening anti-loosening nut 50 and affecting its screwing in when it is screwed in. The inner diameter of the receiving cavity 503 can be equal to the diameter of the outer steel strand 2, preferably larger than the diameter of the outer steel strand 2, so that the inner end of the outer steel strand can smoothly enter the receiving cavity.

[0045] The threaded sleeve 501 has a screwing end 504 on the side of the external thread away from the tapered hole section to facilitate screwing in the anti-loosening nut. The screwing end 504 is a screwing post connected to the rear end of the threaded sleeve. The screwing post is an external hexagonal prism. The screwing post blocks the rear end of the cavity and covers the inner end of the outer steel strand inside. Preferably, the outer diameter of the screwing post is smaller than the outer diameter of the threaded sleeve to allow for a larger screwing operation space. In some embodiments, when the wedge-tightening anti-loosening nut 50 is screwed into the positioning step position, there may be a certain distance between the outer end of the screwing post facing the outer steel strand and the inner end of the outer steel strand. The receiving cavity formed by the screwing post and the threaded sleeve is a protective cavity that covers the outer steel strand. In other embodiments, when the wedge-tightening anti-loosening nut 50 is screwed into the positioning step position, the receiving cavity between the outer end of the screwing post facing the outer steel strand and the inner end of the outer steel strand is a squeezing cavity that presses the inner end of the outer steel strand from the inside out. By squeezing the inner end of the outer steel strand, the reliability of the anchoring is further improved.

[0046] Of course, this utility model is not limited to the embodiments described above. In other embodiments, the inner surface of the outer plate is an overall annular planar structure, but the threading hole for the extension bar through which the inclined section of the outer steel strand passes is inclined to the normal of the inner surface of the outer plate. In other embodiments, the inner diameter of the wedge-tightening screw hole section of the clamping piece is equal to the inner diameter of the large diameter end of the tapered hole section, and the two hole sections are directly connected.

[0047] In other embodiments, the wedge-tightening lock nut adopts a cylindrical structure with external threads on its outer circumferential surface. The end of the cylinder furthest from the outer steel strand has a screwing end. Since there is no internal cavity, when anchoring the outer steel strand, the inner end of the outer steel strand is positioned within the wedge-shaped clamp. When the wedge-tightening lock nut is screwed in, its circular end face presses against the wedge-shaped clamp. In this embodiment, the screwing end can also be an internal hexagonal groove located at the end of the cylindrical structure furthest from the excavated steel strand.

[0048] The specific structure of the extended anchorage connection plate of this utility model is the same as that of the extended anchorage connection plate in the prestressed anchor described above, and will not be repeated here.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An extension anchoring connection plate, comprising a main plate body, the main plate body including a middle plate body and an outer plate body surrounding the middle plate body, the middle plate body having inner reinforcement threading holes for inner steel strands to pass through, and the outer plate body having extension reinforcement threading holes for outer steel strands to pass through, characterized in that, The extension bar threading hole includes a tapered hole section adapted to the wedge-shaped clamp to allow the wedge-shaped clamp to hold and anchor the inner end of the outer steel strand. The extension bar threading hole also includes a clamping screw hole section located inside the tapered hole section for the wedge-tightening nut to be screwed in to tighten the wedge-shaped clamp.

2. The extended anchoring connection plate according to claim 1, characterized in that, The inner diameter of the wedge-tightening screw hole section is larger than the inner diameter of the large diameter end of the tapered hole section, and a positioning step is formed at the junction of the two to position the wedge-tightening anti-loosening nut.

3. The extended anchoring connection plate according to claim 1 or 2, characterized in that, The outer surface of the outer plate is an annular plane. The wedge-tightening screw hole section of the clamping piece is coaxial with the tapered hole section and the axis is inclined relative to the normal of the annular plane so that the outer steel strand can extend straight through.

4. The extended anchoring connection plate according to claim 3, characterized in that, The inner surface of the outer plate is a ring-shaped spherical surface or a ring-shaped conical surface, and the axis of the threading hole of the extension bar extends along the normal of the ring-shaped spherical surface or the ring-shaped conical surface.

5. The extended anchoring connection plate according to claim 3, characterized in that, The angle between the axis of the threaded hole of the extension bar and the normal of the annular plane is equal to or less than 4°.

6. A prestressed anchorage, comprising an anchor plate, an extended anchorage connection plate, and inner and outer steel strands anchored to the extended anchorage connection plate, characterized in that, The extended anchoring connection plate is the extended anchoring connection plate according to any one of claims 1-5. The prestressed anchor also includes a wedge-tightening screw hole section screwed into the inside of the extended anchoring connection plate to tighten the wedge-shaped wedge and make it hold the outer steel strand tightly.

7. The prestressed anchorage according to claim 6, characterized in that, The wedge-tightening nut includes a threaded sleeve. The outer circumferential surface of the threaded sleeve is provided with an external thread adapted to the internal thread of the wedge-tightening screw hole section of the clamping plate. The front end face of the threaded sleeve abuts against the wedge-shaped clamping plate. The threaded sleeve has an inner cavity that opens toward the tapered hole section to allow the inner end of the outer steel strand to extend into it during the process of abutting the wedge-shaped clamping plate. The threaded sleeve has a screwing end on the side of the external thread away from the tapered hole section.

8. The prestressed anchorage according to claim 7, characterized in that, The inner diameter of the cavity is larger than the diameter of the outer steel strand.

9. The prestressed anchorage according to claim 7, characterized in that, The screwing end is a screwing post connected to the rear end of the threaded sleeve. The screwing post blocks the rear end of the cavity and covers the inner end of the outer steel strand inside.

10. The prestressed anchorage according to claim 7, characterized in that, The screwing end is a screwing post connected to the rear end of the threaded sleeve. The screwing post seals the rear end of the cavity and presses the inner end of the outer steel strand when the wedge-shaped clamp is tightened.

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