CN224259727U - A prestressed steel strand anchor - Google Patents
A prestressed steel strand anchorInfo
- Publication number
- CN224259727U CN224259727U CN202521368712.9U CN202521368712U CN224259727U CN 224259727 U CN224259727 U CN 224259727U CN 202521368712 U CN202521368712 U CN 202521368712U CN 224259727 U CN224259727 U CN 224259727U
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- CN
- China
- Prior art keywords
- clamping
- steel strand
- anchor
- hole
- frustum
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Abstract
The utility model relates to a prestress steel strand anchor, which comprises at least two clamping pieces, an anchor plate, a base plate and threaded ribs, wherein at least two clamping pieces are spliced to form a frustum for clamping a steel strand, a clamping hole is formed in the center of the spliced frustum, a reinforcing rib is arranged on the outer surface of the frustum, one end of the anchor plate is abutted against the base plate, an anchoring hole matched with the shape of the frustum is formed in the anchor plate, the frustum is positioned in the anchoring hole and communicated with the clamping hole, through holes communicated with the anchoring hole are formed in the base plate, and two ends of the threaded ribs are respectively abutted against one surface of the base plate, which is far away from the anchor plate, and concrete. The prestress steel strand anchorage device can be adapted to prestress steel strands with higher strength, and safety and reliability of the prestress steel strand during tensioning are improved.
Description
Technical Field
The utility model relates to the technical field of prestressed anchorage devices, in particular to a prestressed steel strand anchorage device.
Background
In modern building engineering, the prestressing technology is an important technology widely applied to large-scale building structures such as large-span structures, high-rise buildings, railways, bridges and the like. The core of the prestressing technique is to increase the load-bearing capacity and stability of the structure by pre-applied stresses. The steel strand is used as a key material in the prestress structure, and the fixing mode directly influences the performance and safety of the prestress structure.
The prestressed concrete steel strand commonly used in the construction of the railway and the bridge at present is 1860MPa grade steel strand, but along with the development of technology, 2300MPa grade high-strength steel strand is gradually applied, the steel consumption can be saved by about 20%, and the bridge span is larger, lighter, stronger and safer. But the strength of 1860 MPa-level steel strand anchors is not suitable for 2300 MPa-level high-strength steel strands.
Therefore, the steel strand prestress anchorage device is provided for adapting to the high-strength prestress steel strand so as to solve the safety and reliability of the prestress steel strand during tensioning.
Disclosure of utility model
In view of the above, the utility model provides a prestressed steel strand anchor, which solves the problem that the anchor is adaptive to a high-strength prestressed steel strand.
In order to achieve the aim, the technical scheme for solving the technical problems is to provide the prestress steel strand anchor which comprises at least two clamping pieces, an anchor plate, a base plate and threaded ribs, wherein the clamping pieces are spliced to form a frustum for clamping a steel strand, a clamping hole is formed in the center of the spliced frustum, a reinforcing rib is arranged on the outer surface of the frustum, one end of the anchor plate is abutted to the base plate, an anchoring hole matched with the shape of the frustum is formed in the anchor hole, the frustum is positioned in the anchor hole and communicated with the clamping hole, through holes 3 communicated with the anchor hole are formed in the base plate, and two ends of the threaded ribs are respectively abutted to one surface of the base plate, which is far away from the anchor plate, and concrete.
In one embodiment, the reinforcing ribs include a first reinforcing rib and a second reinforcing rib, the first reinforcing rib is disposed on two opposite sides of the outer surface of the single clamping piece along a direction perpendicular to the axis of the clamping hole, and the second reinforcing rib is disposed in a middle position of two opposite sides of the outer surface of the single clamping piece.
In one embodiment, the first reinforcing rib is in a quarter cylindrical shape, the second reinforcing rib is in a half cylindrical shape, and the first reinforcing rib and the second reinforcing rib both extend from one end to the other end of the clamping piece along the axial direction of the clamping hole.
In one embodiment, the connection between the first and second ribs and the outer surface of the clip is rounded.
In one embodiment, the two plane ends of the clamping piece and the anchor plate along the axial direction of the clamping hole are provided with chamfers.
In one embodiment, the clip has a scalloped groove on an outer surface of the clip.
In one implementation, the inner surface of the clip 1 is a serrated or threaded surface.
In one embodiment, the ratio of pitch to depth of the thread faces is 1:1.5.
In one embodiment, the backing plate comprises a connecting plate and a guide post, the through hole penetrates through the connecting plate and the guide post, the anchor plate is abutted with one surface of the connecting plate away from the guide post, and the threaded rib is sleeved on the guide post and is abutted with one surface of the connecting plate away from the anchor plate.
In one embodiment, the number of the anchoring holes on the anchor plate is multiple, the anchoring holes are all communicated with the through holes, at least two clamping pieces are arranged in each anchoring hole, the clamping holes formed by the clamping pieces are respectively communicated with each anchoring hole, and the clamping holes formed by the clamping pieces are respectively communicated with the corresponding clamping holes.
Compared with the prior art, the prestress steel strand anchorage device provided by the utility model has the following beneficial effects:
The reinforcing ribs are arranged on the outer surfaces of the single clamping pieces, so that the structural strength of the single clamping pieces is improved, and when the clamping pieces are spliced to form a frustum and clamp the steel strands, the steel strands can bear larger radial pressure without damage or deformation, so that the anchorage device can be adapted to the prestress steel strands with higher strength, and the safety and reliability of tensioning the prestress steel strands are improved.
Drawings
FIG. 1 is a schematic diagram of a prestressed steel strand anchor according to the present utility model;
FIG. 2 is a schematic illustration of the relationship between the prestressed steel strand anchor and the concrete structure of FIG. 1;
FIG. 3 is a schematic view of the split clip of FIG. 1 forming a frustum;
FIG. 4 is a schematic view of the clip of FIG. 1;
FIG. 5 is a schematic view of the structure of the anchor plate of FIG. 1;
FIG. 6 is a schematic cross-sectional view of the anchor plate of FIG. 5;
FIG. 7 is a schematic cross-sectional view of the shim plate of FIG. 1;
FIG. 8 is a schematic view of the structure of the thread rib of FIG. 1;
reference numerals illustrate:
1. Clamping pieces, 11, clamping holes, 12, reinforcing ribs, 121, first reinforcing ribs, 122, second reinforcing ribs, 13, fan ring grooves, 2, anchor plates, 21, anchoring holes, 3, backing plates, 31, through holes, 32, connecting plates, 33, guide posts and 4, screw ribs.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1-8, the present utility model provides a prestressed steel strand anchor, comprising:
the clamping pieces 1, the anchor plates 2, the backing plates 3 and the thread ribs 4 are arranged, the number of the clamping pieces 1 is at least two, at least two clamping pieces 1 are spliced to form a frustum for clamping the steel strand, the center of the spliced frustum is provided with a clamping hole 11, and the outer surface of the frustum is provided with a reinforcing rib 12;
One end of the anchor plate 2 is abutted against the backing plate 3, an anchor hole 21 matched with the shape of a frustum is formed in the anchor plate, and the frustum is positioned in the anchor hole 21 and communicated with the clamping hole 11;
The backing plate 3 is provided with a through hole 31 communicated with the anchoring hole 21, and two ends of the thread rib 4 are respectively abutted with one surface of the backing plate 3 away from the anchor plate 2 and concrete.
Specifically, a space exists between the inner surfaces of the clamping pieces 1 which are mutually close after being spliced to form a clamping hole 11. When the frustum is disposed in the anchoring hole 21, the outer surface of the frustum, that is, the outer surface of the clip 1 and the reinforcing ribs 12 disposed on the outer surface are attached to the inner wall of the anchoring hole 21, so that the clamping hole 11, the anchoring hole 21 and the through hole 31 are mutually communicated. When the steel strand is anchored, the steel strand is first inserted into the anchoring hole 21 and the clamping hole 11 through the through hole 31, and then a pulling force is applied to the steel strand, so that the steel strand moves in the clamping hole 11 towards the direction of the backing plate 3, and at least two clamping pieces 1 are closed towards the center of the clamping hole 11 by the radial extrusion force, namely, a wedge effect, by utilizing the friction force between the steel strand and the inner surface of the clamping pieces 1 and the conical side wall of the anchoring hole 21, so as to clamp/bite the steel strand. And finally, the prestress of the steel strand is transferred to the concrete structure through the abutting connection of the thread ribs 4, so that the anchoring of the steel strand is completed.
In this embodiment, by arranging the reinforcing ribs on the outer surface of the frustum formed by the clip 1, the strength of the clip 1 can be enhanced, deformation or damage of the clip 1 when receiving the radial extrusion force can be avoided, and the effect of prolonging the service life can be realized while the clip 1 can adapt to the prestress with higher strength.
It can be understood that the number of the clamping pieces 1 can be set according to the requirement, as long as the clamping pieces 1 are mutually spliced to form a frustum, and the frustum is provided with a clamping hole 11 for clamping the steel strand.
Preferably, the number of the clamping pieces 1 is two, and the two clamping pieces 1 are spliced to form a frustum, wherein the two clamping pieces 1 are fan-shaped with taper on the outer surface.
The anchor plate 2 is made of 40Cr.
In one embodiment, the reinforcing ribs 12 include a first reinforcing rib 121 and a second reinforcing rib 122, the first reinforcing rib 121 is disposed on opposite sides of the outer surface of the single clip 1 along a direction perpendicular to the axis of the clamping hole 11, and the second reinforcing rib 122 is disposed at a position intermediate to opposite sides of the outer surface of the single clip 1.
It should be noted that, by setting the first reinforcing rib 121 and the second reinforcing rib 122, the frustum can be formed by splicing the clamping pieces 1, and when the process of anchoring the steel strand is subjected to radial extrusion force, the first reinforcing rib 121 and the second reinforcing rib 122 are just located at the contact of the external surface of the frustum and the inner wall of the anchoring hole 21, and the stress concentration part is easy to generate, so that the stress is dispersed, the stress concentration degree is reduced, and the service life of the clamping pieces is prolonged.
Further, the first reinforcing rib 121 has a quarter cylindrical shape, the second reinforcing rib 122 has a half cylindrical shape, and the first reinforcing rib 121 and the second reinforcing rib 122 extend from one end to the other end of the clip 1 along the axial direction of the clamping hole 11.
It can be understood that after the two adjacent clips 1 are spliced, the first ribs 121 of the two clips 1 are spliced to form a semi-cylindrical shape by a quarter cylinder.
The first reinforcing rib 121 and the second reinforcing rib 122 may have other shapes and structures, as long as the structural strength of the clip 1 can be increased.
Further, the connection between the first reinforcing ribs 121 and the second reinforcing ribs 122 and the outer surface of the clip 1 form a rounded corner R, so as to reduce stress concentration when being stressed.
Further, chamfer angles C are arranged at two ends of the clamping piece 1 and the anchor plate 2 along the axial direction of the clamping hole 11, so that a frustum spliced by the clamping piece 1 can be conveniently inserted into the anchoring hole 21, and a steel strand enters the clamping hole 11.
Further, the outer surface of the clamping piece 1 is provided with the fanned annular groove 13, after the at least two clamping pieces 1 are spliced, the fanned annular grooves 13 on the at least two clamping pieces 1 are mutually communicated to form an annular shape, and the at least two clamping pieces 1 can be bundled by the mutually communicated fanned annular grooves 13 by using a rope made of flexible materials, so that the at least two clamping pieces 1 are aligned when spliced, namely, dislocation of the clamping pieces 1 is prevented in the splicing process.
In one embodiment, the inner surface of the clip 1 is a serrated or threaded surface to increase friction when gripping the steel strand.
It can be understood that after the at least two clamping pieces 1 are mutually spliced, the inner surfaces of the clamping pieces 1 form the inner wall of the clamping hole 11, namely the contact surface with the steel strand, and the friction force between the inner wall of the clamping hole 11 and the steel strand in the anchoring process is increased by setting the inner surface of the clamping piece 1 as a serrated surface or a threaded surface, so that the anchoring effect is enhanced.
Further, the ratio of the pitch to the depth of the thread face is 1:1.5.
It should be noted that when the inner surface of the clip 1 is set to be a thread surface, a sufficient tooth depth and a sufficient bite strength can be obtained to avoid slipping when the ratio of the pitch to the tooth depth is set to 1:1.5 and the tooth form angle is kept unchanged.
In one embodiment, the backing plate 3 includes a connecting plate 32 and a guide post 33, the through hole 31 penetrates through the connecting plate 32 and the guide post 33, the anchor plate 2 is abutted with one surface of the connecting plate 32 away from the guide post 33, and the thread rib 4 is sleeved on the guide post 33 and is abutted with one surface of the connecting plate 32 away from the anchor plate 2.
It can be appreciated that by providing the guide post 33, the direction of the stress of the rib 4 can be guided by the guide post 33, so that the rib 4 is prevented from being offset from the axial direction of the guide post 33 after being stressed.
In one embodiment, the number of the anchoring holes 21 on the anchor plate 2 is plural, the plural anchoring holes 21 are all communicated with the through holes 31, at least two conical tables for splicing the clamping pieces 1 are arranged in each anchoring hole 21, and the clamping holes 11 formed by each conical table are respectively communicated with each anchoring hole 21.
It can be understood that by providing a plurality of anchoring holes 21 on the anchor plate 2, each anchoring hole 21 is provided with a frustum therein, and the clamping hole 11 of each frustum is communicated with the anchoring hole 21, it is possible to anchor a plurality of steel strands simultaneously when anchoring the steel strands.
Preferably, the number of anchor holes 21 is four.
The working principle of the utility model will be described by taking two clamping pieces 1 as an example:
When the steel strand is required to be anchored, the backing plate 3 of the anchor is sleeved at the end part of the steel strand bundle, a plurality of steel strands pass through the through holes 31 on the backing plate 3, and each steel strand is respectively sent into the anchoring hole 21 of the anchor plate 2. Next, two clips 1 are placed in each anchoring hole 21, and the two clips 1 are spliced to form a frustum, and the steel strand is positioned in the clamping hole 11 of the frustum. Then, the jack slowly releases pressure to enable each steel strand to start retracting and drive the frustum formed by the two clamping pieces 1 to slowly move, under the extrusion of the conical anchoring hole 21, the two clamping pieces 1 are gradually increased by radial force, so that the clamping pieces 1 are close to the axial direction of the clamping hole 11, and the steel strand is meshed by the inner surfaces of the clamping pieces 1. When the frustum moves to be abutted by the anchoring hole 21, namely, after the steel strand is engaged by the inner surface of the clamping piece 1, the steel strand and the inner surface of the clamping piece 1 do not slide relatively, and the anchoring device finishes the anchoring of the steel strand.
Compared with the prior art, the prestress steel strand anchor provided by the utility model has the advantages that the reinforcing ribs are arranged on the outer surface of the single clamping piece, so that the structural strength of the single clamping piece is increased, the clamping piece can bear larger radial pressure without damage or deformation when being spliced to form a frustum and clamp the steel strand, the anchor can be adapted to the prestress steel strand with higher strength, and the safety and reliability of tensioning the prestress steel strand are improved.
The above-described embodiments of the present utility model do not limit the scope of the present utility model. Any other corresponding changes and modifications made in accordance with the technical idea of the present utility model shall be included in the scope of the claims of the present utility model.
Claims (10)
1. A prestressed steel strand anchor, comprising:
The clamping pieces are at least two, at least two clamping pieces are spliced to form a frustum for clamping the steel stranded wires, the center of the spliced frustum is provided with a clamping hole, and the outer surface of the frustum is provided with a reinforcing rib;
One end of the anchor plate is abutted with the base plate, an anchoring hole matched with the frustum in shape is formed in the anchor plate, and the frustum is positioned in the anchoring hole and communicated with the clamping hole;
And through holes communicated with the anchoring holes are formed in the backing plate, and two ends of the thread ribs are respectively abutted with one surface, away from the anchor plate, of the backing plate and concrete.
2. A prestressed steel strand anchor as set forth in claim 1, wherein:
The reinforcing ribs comprise first reinforcing ribs and second reinforcing ribs, the first reinforcing ribs are arranged on two opposite sides of the outer surface of the single clamping piece along the direction perpendicular to the axis of the clamping hole, and the second reinforcing ribs are arranged in the middle positions of two opposite sides of the outer surface of the single clamping piece.
3. A prestressed steel strand anchor as set forth in claim 2, wherein:
The shape of the first reinforcing rib is a quarter cylinder, the shape of the second reinforcing rib is a half cylinder, and the first reinforcing rib and the second reinforcing rib extend from one end of the clamping piece to the other end along the axial direction of the clamping hole.
4. A prestressed steel strand anchor as set forth in claim 2, wherein:
And the connection parts between the first reinforcing ribs and the outer surfaces of the clamping pieces are round corners.
5. A prestressed steel strand anchor as set forth in claim 1, wherein:
And the two plane ends of the clamping piece and the anchor plate along the axial direction of the clamping hole are provided with chamfers.
6. A prestressed steel strand anchor as set forth in claim 1, wherein:
The outer surface of the clamping piece is provided with a fan ring groove.
7. A prestressed steel strand anchor as set forth in claim 1, wherein:
the inner surface of the clamping piece is a serrated surface or a threaded surface.
8. The prestressed steel strand anchor of claim 7, wherein:
The ratio of the pitch to the depth of the thread surface is 1:1.5.
9. A prestressed steel strand anchor as set forth in claim 1, wherein:
The backing plate comprises a connecting plate and a guide post, the through hole penetrates through the connecting plate and the guide post, the anchor plate is abutted with one side, away from the guide post, of the connecting plate, the threaded rib is sleeved on the guide post and abutted with one side, away from the anchor plate, of the connecting plate.
10. A prestressed steel strand anchor according to any of claims 1-9, characterized in that:
The number of the anchoring holes on the anchor plate is multiple, the anchoring holes are communicated with the through holes, at least two conical tables spliced by the clamping pieces are arranged in each anchoring hole, and the clamping holes formed by each conical table are respectively communicated with each anchoring hole.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN224259727U true CN224259727U (en) | 2026-05-19 |
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| Date | Code | Title | Description |
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| GR01 | Patent grant |