CN217106214U

CN217106214U - High-strength anchor working clamping piece

Info

Publication number: CN217106214U
Application number: CN202220835578.9U
Authority: CN
Inventors: 韦建宏; 刘建英; 唐茂; 黄振桂; 韦中夫; 谢彦钧
Original assignee: Liuzhou Qm Construction Machinery Co ltd
Current assignee: Liuzhou Qm Construction Machinery Co ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-08-02
Anticipated expiration: 2032-04-12

Abstract

The utility model discloses a high strength ground tackle work clamping piece, relate to ground tackle technical field, enclose two clamping piece body bores that close and have screw thread, it has the elastic groove and places the recess of restraint circle to open on the straight body section of clamping piece body, the hole includes the first changeover portion that sets gradually towards little terminal surface by the big terminal surface of clamping piece body along the axial, straight hole section, back taper hole section and second changeover portion, the length of back taper hole section is 8 ~ 12mm, the tapering is 1: 20, straight hole section links up with the tip of back taper hole section, first changeover portion is the inclined plane of connecting the big terminal surface of clamping piece body and straight hole section, the second changeover portion is the arc surface of connecting the tip of clamping piece body and the tip of back taper hole section; the thread form of the thread is zigzag, and the thread form angle is 70-85 degrees; the length of the elastic groove is less than half of the length of the clamping piece body. The utility model provides a current QMV ground tackle work clamping piece can't satisfy the problem that 2400MPa rank high strength steel strand wires's anchor performance required.

Description

High-strength anchor working clamping piece

Technical Field

The utility model belongs to the technical field of the ground tackle technique and specifically relates to a QMV high strength ground tackle work clamping piece of building, bridge construction usefulness.

Background

The QMV working anchorage device utilizes the wedging force of a working clamping piece and a working anchor plate to clamp a steel strand, when a tensioning jack applies stress to the steel strand and then releases the tension, the clamping piece is brought into a conical hole of the anchor plate by a reverse force generated by the steel strand, the clamping piece is not deeply occluded with the steel strand at the beginning, the retraction speeds of the steel strand and the clamping piece are not consistent, after the clamping piece is occluded to a certain depth, the working clamping piece and the steel strand enter the conical hole of the working anchor plate together to form an anchoring unit, and prestress is transmitted into a component through an anchor backing plate and an anchoring device thereof to form permanent prestress. In order to meet the requirements of large-span design of current building structures and rapid development of heavy-load prestressed structures, prestressed steel strands are gradually developing towards the direction of large diameter and high strength. The strength of the newly developed 2400 MPa-grade high-strength steel strand is improved by 400MPa compared with that of the 2000 MPa-grade high-strength steel strand which is more widely applied at present, the hardness of the newly developed 2400 MPa-grade high-strength steel strand is correspondingly increased, and the strength and the hardness of the newly developed steel strand are increased, so that the working clamping piece in the existing QMV15 series 2000 MPa-grade working anchorage device cannot meet the requirement on the anchoring performance of the 2400 MPa-grade high-strength steel strand.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high strength ground tackle work clamping piece, the unable problem that satisfies 2400MPa rank high strength steel strand wires's anchor performance requirement of current QMV ground tackle work clamping piece can be solved to this kind of clamping piece.

In order to solve the above problem, the utility model discloses a technical scheme is: the high-strength anchor working clamping piece is a hollow truncated cone composed of two symmetrical clamping piece bodies, wherein each clamping piece body is provided with a straight section, a groove for placing a restraining ring is arranged on the outer wall of the straight body section along the circumferential direction, threads are arranged on the wall of an inner hole formed by the enclosing of the clamping piece body, the wall body of the clamping piece body is provided with an elastic groove along the axial direction from the large end surface, the inner hole comprises a first transition section, a straight hole section, an inverted cone hole section and a second transition section which are sequentially arranged along the axial direction from the large end surface to the small end surface of the clamping piece body, the length of back taper hole section is 8 ~ 12mm, and the tapering is 1: 20, the inner of straight hole section with the tip of back taper hole section links up, the first transition section is an inclined plane which connects the large end surface of the clamping piece body and the outer end of the straight hole section, the second transition section is an arc surface which connects the small end surface of the clamping piece body and the large end of the inverted cone hole section; the thread form of the thread is zigzag, and the thread form angle is 70-85 degrees; the length of the elastic groove is less than half of the length of the clamping piece body.

In the technical scheme of the high-strength anchor working clamping piece, a more specific technical scheme can also be as follows: the small end face, the large end face and the outer surface of the clamping piece body are provided with fillets.

Furthermore, the bottom surface of the groove is a semi-cylindrical surface, the bottom surface is perpendicular to the side walls of the two sides of the groove, and the bottom surface and the side walls are rounded.

Furthermore, inclined planes are arranged between the two side walls of the groove and the outer surface of the clamping piece body.

Furthermore, the length of the clamping piece body is 48-52 mm, the outer diameter of the large end is 29-30 mm, the major diameter of the tooth shape is 15.5-16.5 mm, and the bottom diameter of the tooth shape is 14.5-15.5 mm.

Further, the length of the inverted cone hole section is 10 mm; the length of the clamping piece body is 50mm, the outer diameter of the large end of the clamping piece body is 29.5mm, the major diameter of the tooth shape of the clamping piece body is 15.68mm, and the diameter of the bottom of the tooth shape of the clamping piece body is 14.7 mm.

Since the technical scheme is used, compared with the prior art, the utility model following beneficial effect has:

1. the first transition section, the inverted taper hole section and the second transition section are arranged in the inner hole of the clamping piece body, so that the biting force of the working clamping piece on the 2400 MPa-grade high-strength steel strand can be enhanced through the tensile force, meanwhile, the stress concentration at the end part of the clamping piece is eliminated, the damage of the working clamping piece of the anchorage device is reduced, the anchoring efficiency is improved, and the anchoring reliability and the anchoring permanence are enhanced; the length and the taper of the inverted cone hole section and the length of the elastic groove relative to the clamping piece are limited, so that the clamping piece can have enough clamping force on the steel strand, and steel is saved; the clamping piece adopts the sawtooth thread, has small damage to the steel strand, has large equivalent friction coefficient of a large profile angle, and can enhance the self-anchoring capability.

2. The outer edges of the two ends of the clamping piece body are rounded, so that stress concentration can be placed, and the service life is prolonged.

3. The structural design of recess, the recess design outside the frustum of clamping piece body, the intensity of reinforcing clamping piece self, the setting on recess outer fringe inclined plane does benefit to dismouting restraint circle, and restraint circle can adopt the elasticity steel ring, increases the radial constraining force of restraint circle to the clamping piece, improves the steadiness of anchor.

Drawings

FIG. 1 is a schematic view of the present high strength anchor working jaw.

Fig. 2 is a view in the direction a of fig. 1.

Fig. 3 is a clip internal bore wall thread.

The reference numbers illustrate: 1. a clip body; 2. a straight body section; 1-1, large end face; 1-2, small end face; 3. an elastic groove; 4. a groove; 5. an inner bore; 5-1, a first transition section; 5-2, straight hole section; 5-3, an inverted cone hole section; 5-4, a second transition section; 6. and (4) threading.

Detailed Description

The invention will be described in more detail with reference to the following embodiments:

the high-strength anchor working clamping piece shown in the figures 1 and 2 is a hollow truncated cone composed of two symmetrical clamping piece bodies 1, wherein a large end surface 1-1, a small end surface 1-2 and the outer surface of each clamping piece body 1 are provided with fillets, an elastic groove 3 is axially arranged on the wall body of each clamping piece body 1 from the middle part of the large end surface 1-1 along the clamping piece body 1, and the length of the elastic groove 3 is less than one half of the length of the clamping piece body 1. The outer wall of the straight body section 2 of the clamping piece body 1 is circumferentially provided with a groove 4 for placing a restraining ring, the groove 4 is vertically intersected with the elastic groove 3, and the groove 4 is positioned at the two-seventh axial position of the elastic groove 3. The restraint ring of the embodiment adopts an elastic steel ring, the bottom surface of the groove 4 matched with the elastic steel ring is a semi-cylindrical surface, the bottom surface is vertical to the side walls at two sides of the groove 4, the bottom surface and the side walls are rounded, and inclined planes are arranged between the two side walls of the groove 4 and the outer surface of the clip body 1; the structure of the groove 4 increases the contact area between the elastic steel ring and the bottom surface of the groove 4 and limits the two sides of the elastic steel ring, so that the radial and axial constraint force of the elastic steel ring on the clamping piece body 1 can be enhanced, and the anchoring reliability is improved.

The wall of an inner hole 5 formed by enclosing the two clamping piece bodies 1 is provided with a thread 6, the thread 6 is in a sawtooth shape, and the tooth shape angle is 70-85 degrees. The inner hole 5 comprises a first transition section 5-1, a straight hole section 5-2, an inverted cone hole section 5-3 and a second transition section 5-4 which are sequentially arranged from the large end face to the small end face of the clamping piece body 1 along the axial direction, the first transition section 5-1 is an inclined plane connecting the large end face 1-1 of the clamping piece body 1 and the outer end of the straight hole section 5-2, the inner end of the straight hole section 5-2 is connected with the small end of the inverted cone hole section 5-3, the small end of the inverted cone hole section 5-3 is connected with the small end face 1-2 of the clamping piece body 1 through the second transition section 5-4, and the second transition section 5-4 is an arc surface. The length of the clamping piece body 1 is 48-52 mm, the outer diameter of the large end is 29-30 mm, the major diameter of the tooth shape is 15.5-16.5 mm, and the bottom diameter of the tooth shape is 14.5-15.5 mm; the diameter of first changeover portion on big terminal surface is greater than the big footpath of tooth type, and the length of back taper hole section is 8 ~ 12mm, and the tapering is 1: 20. Preferably, the length of the inverted cone hole section is 10 mm; the length of the clip body is 50mm, the outer diameter of the large end is 29.5mm, the major diameter of the tooth shape is 15.68mm, and the bottom diameter of the tooth shape is 14.7 mm.

The high-strength anchor working clamping piece has small damage to 2400 MPa-grade high-strength steel strands, the anchoring efficiency coefficient can reach more than 95%, and the high-strength anchor has high anchoring efficiency, good permanence, strong reliability and excellent overall anchoring performance.

Claims

1. The utility model provides a high strength ground tackle work clamping piece comprises the clamping piece body of two symmetries cavity circular truncated cone, the clamping piece body has a straight body section offer the recess that is used for placing the confinement ring along circumference on the straight body section outer wall, the clamping piece body encloses the hole pore wall that closes the formation and has arranged the screw thread, it has elastic groove, its characterized in that to open along the axial from big terminal surface on the wall body of clamping piece body: the inner hole comprises a first transition section, a straight hole section, an inverted cone hole section and a second transition section which are sequentially arranged from the large end face to the small end face of the clamping piece body along the axial direction, the length of the inverted cone hole section is 8-12 mm, the taper is 1: 20, the inner end of the straight hole section is connected with the small end of the inverted cone hole section, the first transition section is an inclined plane which is used for connecting the large end face of the clamping piece body and the outer end of the straight hole section, and the second transition section is an arc surface which is used for connecting the small end face of the clamping piece body and the large end of the inverted cone hole section; the thread form of the thread is zigzag, and the thread form angle is 70-85 degrees; the length of the elastic groove is less than half of the length of the clamping piece body.

2. The high strength anchor work jaw of claim 1, wherein: the small end face, the large end face and the outer surface of the clamping piece body are provided with fillets.

3. The high strength anchor work jaw of claim 2, wherein: the groove is arranged at the straight section of the clamping piece body.

4. The high strength anchor work jaw of claim 3, wherein: the bottom surface of the groove is a semi-cylindrical surface, the bottom surface is perpendicular to the side walls of the two sides of the groove, and the bottom surface and the side walls are rounded.

5. The high strength anchor work jaw of claim 4, wherein: inclined planes are arranged between the two side walls of the groove and the outer surface of the clamping piece body.

6. A high strength anchor working jaw according to any one of claims 1 to 5, wherein: the length of the clamping piece body is 48-52 mm, the outer diameter of the large end is 29-30 mm, the tooth-shaped large diameter is 15.5-16.5 mm, and the tooth-shaped bottom diameter is 14.5-15.5 mm.

7. The high strength anchor work jaw of claim 5, wherein: the length of the inverted cone hole section is 10 mm; the length of the clamping piece body is 50mm, the outer diameter of the large end of the clamping piece body is 29.5mm, the major diameter of the tooth shape of the clamping piece body is 15.68mm, and the diameter of the bottom of the tooth shape of the clamping piece body is 14.7 mm.