CN220725536U

CN220725536U - Prestressed anchor plate

Info

Publication number: CN220725536U
Application number: CN202322202790.9U
Authority: CN
Inventors: 曾航宇; 莫鲤木; 刘进; 温朝臣; 蒋业东; 邓强; 左海宁; 经凤明
Original assignee: Liuzhou OVM Machinery Co Ltd
Current assignee: Liuzhou OVM Machinery Co Ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2024-04-05
Anticipated expiration: 2033-08-16

Abstract

The utility model discloses a prestress anchor plate, which is used for being matched with a conical clamping piece to anchor a prestress rib with a folding angle, and comprises a through hole for penetrating the prestress rib, wherein the through hole comprises a conical hole section, a straight barrel section and a divergent section; the taper hole section is used for being matched with the taper clamping piece; one end of the straight cylinder section is communicated with the small end of the taper hole section, and the other end of the straight cylinder section is communicated with the small end of the divergent section; the diverging section comprises a rounded corner or one of at least two consecutive joining chamfers; wherein the sum of the angles of the chamfer angles is smaller than the angle of the prestress rib. The prestress anchor plate disclosed by the utility model can effectively disperse stress concentration at the contact part of the bending part of the prestress rib and the anchor plate, can avoid anchor failure, improves the anchoring performance of an anchor, does not need to accurately calculate the angle of refraction before construction, and can prefabricate the anchor plate before construction and improve the construction efficiency.

Description

Prestressed anchor plate

Technical Field

The utility model relates to the field of anchor plates for inhaul cables, in particular to a prestressed anchor plate.

Background

At present, the existing anchor plate for prestress construction is generally cylindrical, a plurality of through holes are drilled in the anchor plate, the central line of the anchor plate is perpendicular to two end faces, one end of the through hole of the anchor plate is a taper hole for installing a clamping piece, the other end of the through hole of the anchor plate is a straight hole, a chamfer angle for threading guiding is arranged at an orifice of the straight hole, the angle is generally 45 degrees or 60 degrees, and a steel stranded wire penetrates into an embedded pipe orifice after penetrating through the through hole of the anchor plate. During prestress tensioning construction, the reference circle of the conical hole of the outer ring of the anchor plate is often larger than the inner diameter of the embedded pipe, a bending angle is formed at the bottom opening of the anchor plate by the steel strand, the steel strand contacts with the sharp edge of the straight hole during tensioning construction to form point contact, and the steel strand is broken in advance due to overlarge local stress, so that the anchoring efficiency of the anchor device is affected.

In the prior art, the schemes capable of solving the technical problems are mainly divided into two types: first, for example, in a tool anchor plate for tensioning prestressed steel strands disclosed in chinese patent CN202611107U, aiming at the problem that the steel strands are likely to break in advance due to local stress increase because the bending angle of the steel strands passing through the tapered holes at the outermost periphery (six corner positions) of the tool anchor plate is correspondingly increased during tensioning construction, the structure that the outer Zhou Tongkong axis of the anchor plate is inclined towards the bending direction of the steel strands is adopted, and the bending angle of the outer ring prestressed steel strands is reduced by using the inclined angle of the inclined plane, so that the local stress increase of the steel strands is prevented from breaking. The second type, for example, the prestress anchor plate tool for high-strength steel strands disclosed in chinese patent CN202787667U, can reduce the shearing force of the anchor device on the steel strands caused by the installation deflection of the steel strands, adopts a structure that a second taper hole is connected behind the straight hole of the anchor plate, the second taper hole is opposite to the first taper hole for installing the clamping piece, and adopts a second taper hole with stress release function, so that the steel strands are prevented from being damaged by the shearing force caused by the high stress and the deflection of the steel strands in the use process.

Among the above-mentioned prior art, all need calculate the gradient or the tapering of relieving stress concentration structure before the construction accurately, the great or less problem that leads to the steel strand wires rupture of stress concentration all can't be solved to the angle, and can't prefabricate the anchor slab before the construction, and the efficiency of construction is lower.

Disclosure of Invention

The utility model provides a prestress anchor plate aiming at the problems that the inclination or taper of a stress concentration relieving structure is required to be accurately calculated before construction, and the problem that a steel strand breaks due to stress concentration cannot be solved.

The utility model adopts the following technical scheme to realize the purposes:

the prestress anchor plate is used for being matched with the conical clamping piece to anchor the prestress rib with the folded angle, and comprises a through hole for penetrating the prestress rib, wherein the through hole comprises a conical hole section, a straight barrel section and a divergent section; the taper hole section is used for being matched with the taper clamping piece; one end of the straight cylinder section is communicated with the small end of the taper hole section, and the other end of the straight cylinder section is communicated with the small end of the divergent section; the diverging section comprises a rounded corner or one of at least two consecutive joining chamfers; wherein the sum of the angles of the chamfer angles is smaller than the angle of the prestress rib.

The technical scheme comprises two technical schemes: the first is that the divergent section comprises a fillet, the fillet structure in the technical scheme can enable the prestressed tendon to smoothly transition, and compared with the chamfer structure in the prior art, the contact area of the fillet structure and the prestressed tendon is larger, so that the contact stress can be further released; the second middle is that the divergent section comprises at least two continuously connected chamfer structures, and because the sum of chamfer angles is smaller than the angle of the prestressed tendon, the prestressed tendon is in line contact with the divergent section by at least two chamfer lengths, and compared with the point contact of one chamfer structure in the prior art, the line contact can reduce the stress when the contact is in tension, and avoid stress concentration; therefore, the two schemes in the technical scheme can effectively disperse stress concentration at the contact part of the bending part of the prestressed tendon and the anchor plate, can avoid anchoring failure caused by early damage to the steel strand, and improve the anchoring performance of the anchor; meanwhile, the angle of the folded angle is not required to be accurately calculated before construction, an anchor plate can be prefabricated before construction, and the construction efficiency is improved.

Further technical scheme is, the section of diverging includes fillet and chamfer, the one end and the straight section of thick bamboo of chamfer link up, the other end and the fillet link up, the angle of chamfer is less than the dog-ear angle of prestressing tendons. In this technical scheme, the dispersion section adopts the chamfer to link up the mode of fillet, on the one hand, makes prestressing tendons form linear contact in chamfer department, avoids stress concentration, on the other hand, and fillet structure can make prestressing tendons smooth and easy transition when wearing out the anchor slab through-hole, further release contact stress.

The further technical scheme is that the sum of angles of the chamfer angles is larger than or equal to 1 degree and smaller than or equal to 4 degrees.

The further technical scheme is that the angle of the chamfer is larger than or equal to 1 degree and smaller than or equal to 4 degrees.

The beneficial effects of the utility model are as follows:

according to the prestressed anchor plate, the point contact of the bending part of the prestressed tendon in the prior art is changed into the line contact by the divergent section structure of the through hole, the stress of the contact in tensioning can be reduced by the line contact, the stress concentration of the contact part of the bending part of the prestressed tendon and the anchor plate can be effectively dispersed, the anchoring failure caused by the early damage of the prestressed tendon can be avoided, the anchoring performance of an anchor device is improved, the angle of refraction is not required to be accurately calculated before construction, the anchor plate can be prefabricated before construction, and the construction efficiency is improved.

Drawings

Fig. 1 is: the utility model discloses a structural schematic diagram of a prestressed anchor plate.

Fig. 2 is: the through hole of the first embodiment of the utility model is schematically structured.

Fig. 3 is: the through hole of the second embodiment of the utility model is a schematic structural diagram.

Fig. 4 is: the through hole of the third embodiment of the utility model is a schematic structural diagram.

In the figure:

1. an anchor plate; 10. a through hole; 11. a taper hole section; 12. a straight barrel section; 13. chamfering; 14. round corners; 131. a first chamfer; 132. a second chamfer; 133. and (3) third chamfering.

Detailed Description

The present utility model will be described in detail below with reference to fig. 1 to 4 and the detailed description of the embodiments, and the following examples and features of the examples may be combined with each other without conflict.

As shown in fig. 1 to 2, the present embodiment provides a prestressed anchor plate, which is used for anchoring a prestressed tendon with a bevel in cooperation with a tapered clip, and because the prestressed tendon penetrating through the anchor plate 1 penetrates into an embedded pipe orifice, the inner diameter of the embedded pipe orifice is smaller than the reference circle of the through hole 10 of the outer ring of the anchor plate 1, the prestressed tendon forms a bevel at the outlet of the through hole 10 of the outer ring of the anchor plate 1; the anchor plate 1 of the embodiment comprises a through hole 10 for penetrating the prestressed tendons, wherein the through hole comprises a taper hole section 11, a straight barrel section 12 and a divergent section; the taper hole section 11 is used for being matched with the taper clamping piece; one end of the straight barrel section 12 is communicated with the small end of the taper hole section 12, and the other end of the straight barrel section is communicated with the small end of the divergent section;

specifically, the divergent section includes three continuous connection chamfers, specifically a first chamfer 131, a second chamfer 132 and a third chamfer 133, which are sequentially connected, and the chamfer angles are a, b and c respectively; wherein the sum of the angles of the a+b+c is smaller than the angle of the prestress rib; the prestressed tendons are steel strands; the divergent section diverges from the anchor plate 1 toward the direction of the pre-buried pipe orifice to form a horn-like structure.

In this embodiment, because the sum of chamfer angles a+b+c is smaller than the angle of inflection of the steel strand wires, so the steel strand wires and divergent section have three line contacts of first chamfer 131, second chamfer 132 and third chamfer 133 length, for the point contact of a chamfer structure in prior art, line contact can reduce the stress when contact is in stretching, can effectively disperse the stress concentration of the steel strand wires bending part and anchor plate 1 contact department, can avoid leading to the anchor failure because of the early damage of steel strand wires, improve the anchoring performance of the anchor, need not to calculate angle of inflection accurately before the construction, can prefabricate anchor plate 1 before the construction, improve the efficiency of construction. The test parameters of the three continuous connection chamfer structures and the common 60-degree chamfer structure in the prior art are compared as follows:

as can be seen from test results, in the 60-degree chamfer anchor plate in the prior art, two groups of anchor plates are low in anchoring efficiency coefficient due to broken wires at the chamfer positions of the straight holes, and in the anchor plate 1 adopting the three continuous connection chamfers in the embodiment, broken wires do not appear at the chamfer positions, so that the anchoring efficiency is improved by about 1-2%.

The foregoing embodiments exemplarily show the specific number of continuous joining chamfer, and in other embodiments or practical applications, the number of continuous joining chamfer may be two or more than three, and the like, so that the bent angle of the steel strand and the structure of the through hole 10 can be ensured to be in line contact.

In another embodiment, based on the above embodiment, the sum of the chamfer angles a+b+c of the first chamfer 131, the second chamfer 132, and the third chamfer 133 is greater than or equal to 1 ° and less than or equal to 4 °.

In another embodiment, as shown in fig. 3, different from the above embodiment, the divergent section structure is specifically a rounded corner 14, in this embodiment, a small end of the rounded corner 14 is connected with the straight barrel section 12, a large end extends to an end of the through hole 10 of the anchor plate 1, the rounded corner 14 can make the steel strand smoothly transition, and compared with the chamfer structure in the prior art, the contact area between the rounded corner 14 and the steel strand is larger, so that the contact stress can be further released, and the stress concentration at the contact position between the bent position of the steel strand and the anchor plate 1 can be effectively dispersed.

In still another embodiment, as shown in fig. 4, the difference from the above embodiment is in the diverging section structure, in this embodiment, the diverging section is specifically a chamfer 13 and a round corner 14 that are continuously connected, the angle of the chamfer 13 is a, the small end of the chamfer 13 is connected with the straight section 12, the large end of the chamfer 13 is connected with the small end of the round corner 14, and the large end of the round corner 14 extends to the end of the through hole 10 of the anchor plate 1. In this embodiment, the dispersion section adopts the mode that chamfer 13 links up fillet 14, on the one hand makes the steel strand wires form linear contact in chamfer 13 department, avoids stress concentration, on the other hand, the fillet 14 can make the steel strand wires smooth transition when wearing out anchor slab 1 through-hole 10, further release contact stress.

In another embodiment, the chamfer angle a of the chamfer 13 is greater than or equal to 1 ° and less than or equal to 4 ° on the basis of the above embodiment.

In addition, the foregoing embodiments exemplarily illustrate that the tendon is specifically a steel strand, and in other embodiments or practical applications, the tendon may also be a steel wire, a carbon fiber tendon, or the like.

According to the prestress anchor plate, the point contact of the bending part of the prestress rib in the prior art is changed into the line contact by the divergent section structure of the through hole 10, the stress of the contact in tensioning can be reduced by the line contact, the stress concentration of the contact part of the bending part of the prestress rib and the anchor plate 1 can be effectively dispersed, the anchoring failure caused by the early damage of the prestress rib can be avoided, the anchoring performance of an anchor device is improved, meanwhile, the angle of refraction is not required to be accurately calculated before construction, the anchor plate can be prefabricated before construction, and the construction efficiency is improved.

Claims

1. The prestress anchor plate is used for being matched with the conical clamping piece to anchor the prestress rib with the folding angle, and is characterized by comprising a through hole for penetrating the prestress rib, wherein the through hole comprises a conical hole section, a straight barrel section and a divergent section;

the taper hole section is used for being matched with the taper clamping piece; one end of the straight cylinder section is communicated with the small end of the taper hole section, and the other end of the straight cylinder section is communicated with the small end of the divergent section;

the diverging section comprises a rounded corner or one of at least two consecutive joining chamfers;

wherein the sum of the angles of the chamfer angles is smaller than the angle of the prestress rib.

2. The prestressed anchorage plate of claim 1, wherein said diverging section includes a fillet and a chamfer, one end of said chamfer being engaged with the straight section and the other end being engaged with the fillet, said chamfer having an angle less than the angle of the tendon.

3. A prestressed anchorage plate according to claim 1, wherein the sum of the angles of said chamfer is greater than or equal to 1 ° and less than or equal to 4 °.

4. A prestressed anchorage plate according to claim 2, wherein the chamfer angle is greater than or equal to 1 ° and less than or equal to 4 °.