CN210563002U

CN210563002U - Anchor device at tensioning end

Info

Publication number: CN210563002U
Application number: CN201921187980.5U
Authority: CN
Inventors: 陈登凯; 杨明; 周佳
Original assignee: Vsl Engineering Co ltd
Current assignee: Vsl Engineering Co ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-05-19
Anticipated expiration: 2029-07-25

Abstract

The utility model belongs to the technical field of the engineering construction, in particular to stretch-draw end ground tackle for anchor rope anchor, including the anchor slab, be equipped with the anchor hole that supplies the prestressed tendons to pass on the anchor slab, the inner in anchor hole is the big, inboard little taper hole in the outside, and the taper hole conforms with the periphery shape of clamping piece, and the front end of taper hole is equipped with the terminal surface constitution that leans on the complex face that blocks with the oversheath of prestressed tendons, blocks to be equipped with the hole on the face and supplies steel strand wires to pass. With prior art in need strip longer oversheath opposite, the utility model discloses only need strip shorter oversheath when using, when stretch-draw prestressing tendons, block the face and regard as oversheath terminal surface displacement terminal point, inject the oversheath in the taper hole outside, effectively prevent the potential safety hazard that the oversheath got into the taper hole and leads to.

Description

Anchor device at tensioning end

Technical Field

The utility model belongs to the technical field of the engineering construction, in particular to stretch-draw end ground tackle for anchor rope anchor.

Background

The anchor at the tensioning end is arranged at the tensioning end of the prestressed tendon, and the anchoring state of the prestressed tendon can be always kept in the tensioning process of the prestressed tendon. When the prestressed tendon tensioning device is used, the prestressed tendon is guided to penetrate through the anchor slab, the clamping piece is arranged in the anchor slab taper hole, then the prestressed tendon is tensioned, the prestressed tendon is stretched, and after the tensioning external force is removed, the prestressed tendon retracts and drives the clamping piece to move in the taper hole of the prestressed tendon in the same direction, so that the prestressed tendon is clamped, and the reliable anchoring of the prestressed tendon is realized.

The prestressed tendons usually adopt steel strands, and the corrosion resistance of the steel strands directly influences the maintenance and service life of the prestress. In the prior art, the prestressed tendon usually adopts a steel strand with a PE outer sheath, and the PE outer sheath cannot be occluded with the clamping piece, so the prestressed tendon at the clamping piece occlusion fixing section must completely strip the PE outer sheath coated on the periphery of the steel strand. The stripping length of the PE outer sheath is calculated based on the stress elongation of the steel strand, but the actual elastic modulus of the material is different from the theoretical elastic modulus, so that the calculated elongation and the actual elongation of the steel strand have deviation, and the precision of the stripping length of the PE outer sheath is influenced. The PE outer sheath stripping section is too short, so that the PE outer sheath enters the clamping piece meshing section, the clamping pieces cannot be meshed with the prestressed tendons, the steel strand can be separated from the anchorage device in a stressed state, and serious accidents such as construction equipment damage and even casualties are caused. Therefore, during the current construction, based on the safety consideration, the longer PE outer sheath can be stripped, then the corrosion prevention of the exposed steel strand on the outer side of the anchor is realized by increasing the distance between the clamping piece and the outer end face of the anchor, for example, arranging a transition pipe or a sealing cylinder on the outer end face of the anchor plate or the anchor backing plate, and the anchor has high anchoring cost and complicated construction.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anchorage device at tensioning end can simplify the anchorage device structure when the compensation oversheath strips length error.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a tensioning end anchorage device comprises an anchor plate, wherein an anchor hole for a prestressed tendon to pass through is formed in the anchor plate, a taper hole with a large outer side and a small inner side is formed in the inner end of the anchor hole, the taper hole is matched with the peripheral shape of a clamping piece, a stop surface which is abutted against the outer sheath of the prestressed tendon is formed in the front end of the taper hole, and a hole for a steel strand to pass through is formed in the stop surface.

With prior art in need strip longer oversheath opposite, the utility model discloses only need strip shorter oversheath when using, when stretch-draw prestressing tendons, block the face and regard as oversheath terminal surface displacement terminal point, inject the oversheath in the taper hole outside, effectively prevent the potential safety hazard that the oversheath got into the taper hole and leads to. Meanwhile, the steel strand of the prestressed tendon is in a naked state from the inside of the blocking surface, so that the reliable corrosion prevention of the naked steel strand can be realized only by ensuring the corrosion prevention performance of the blocking surface, and the corrosion prevention structure of the prestressed tendon is greatly simplified.

Drawings

The contents of the description and the references in the drawings are briefly described as follows:

FIGS. 1, 5-7 are schematic views of the present invention in use;

FIGS. 2 and 3 are enlarged schematic views of a portion B in FIG. 1;

fig. 4 is a schematic view of another embodiment.

In the figure: 10. the anchor block comprises an anchor plate, 11 anchor holes, 111 taper holes, 112 blocking faces, 12 retaining rings, 13 step faces, 14 sealing rings, 15 separating rings, 16 protective bushes, 20 clamping pieces, 30 deviation rectifying devices, 40 pressing plates, 41 through holes, 411 large-aperture sections, A prestressed tendons, A1 steel strands and A2 outer sheaths.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings.

For convenience of description, the utility model discloses the one end of supplying prestressing tendons A to enter anchor slab 11 with anchor hole 11 is marked as the outer end, and the one end that supplies prestressing tendons A to wear out anchor slab 11 and cooperate with clamping piece 20 with anchor hole 11 is marked as the inner. The prestressed tendon A comprises a steel strand A1, an outer sheath A2 is sleeved on the periphery of the steel strand A1, and the outer sheath A2 has good elastic performance.

A tensioning end anchorage device comprises an anchor plate 10, wherein an anchoring hole 11 for a prestressed tendon A to pass through is formed in the anchor plate 10, a taper hole 111 with a large outer side and a small inner side is formed in the inner end of the anchoring hole 11, the taper hole 111 is matched with the peripheral shape of a clamping piece 20, a blocking surface 112 which is abutted and matched with the end surface of an outer sheath A2 of the prestressed tendon A is arranged at the front end of the taper hole 111, and a hole for a steel strand A1 to pass through is formed in the blocking surface 112.

In specific implementation, an outer sheath A2 with the length smaller than the extension amount of the steel strand A1 is stripped, the exposed steel strand A1 penetrates through the anchoring hole 11, then the prestressed tendon A is tensioned, the prestressed tendon A extends under stress, and the end face of the outer sheath A2 displaces towards the side where the blocking face 112 is located. The outer sheath A2 is made of non-metal materials generally, has good elastic performance, the prestressed tendon A is continuously tensioned after the outer sheath A2 is attached to the blocking surface 112, the outer sheath A2 is elastically deformed under pressure, and is blocked outside the taper hole 111 by the blocking surface 112, so that the outer sheath A2 is effectively prevented from entering the taper hole 111 to influence operation safety. The end face of the outer sheath A2 can be any face forming an included angle with the axial direction of the outer sheath A2, when the end face of the outer sheath A2 is chamfered, the chamfer also forms a part of the end face of the outer sheath A2, the blocking face 112 can be matched with the end face of the outer sheath A2 or arranged along the radial direction of the anchoring hole 11, and the operation safety can be protected as long as the blocking face 112 can be abutted against and connected with the end face of the outer sheath A2 and prevent the outer sheath A2 from entering the taper hole 111.

Preferably, the inner wall surface and/or the opening edge of the outer end of the anchor hole 11 is provided with a retaining ring 12, the outer end surface of the retaining ring 12 forms a blocking surface 112 which is in abutting fit with the end surface of the outer sheath a2 of the prestressed tendon a, and the middle hole of the retaining ring 12 is used for the steel strand a1 of the prestressed tendon a to pass through. Like this, retaining ring 12 supplies steel strand wires A1 to pass and lean on with lag A2 and be connected, simultaneously, retaining ring 12 compressive deformation and anchor hole 11, prestressing tendons A constitute sealed cooperation and can also avoid the anticorrosive inefficacy that anticorrosive medium reveals and leads to, retaining ring 12 has both realized prestressing tendons A's safe and reliable stretch-draw promptly, has simplified its anticorrosive structure when guaranteeing prestressing tendons A corrosion resisting property again.

Further, the outer end of the anchor hole 11 is in a stepped hole shape with a large outer diameter and a small inner diameter, the inner end face of the retainer ring 12 abuts against and is connected with the stepped face 13, the retainer ring 12 is prevented from displacing towards the tapered hole 111 side under the action of the outer sheath a2, as shown in fig. 2, the large-diameter section of the stepped hole at the outer end of the anchor hole 11 is used for accommodating the retainer ring 12, and the outer end face of the retainer ring 12 is flush with the outer end face of the anchor hole 11 so as to meet the installation requirement of the anchor.

Furthermore, the retainer ring 12 is made of a non-metallic material to ensure the fatigue life of the steel strand A1 under a dynamic stress state.

Preferably, the outer end of the anchoring hole 11 is in a stepped hole shape with a small outer hole diameter and a large inner hole diameter, and the outer end face thereof forms a blocking surface 112 to be abutted and matched with the end face of the outer sheath a2 of the tendon a. In this way, the anchoring hole 11 itself can protect the tapered hole 111 from the outer sheath a2 entering and affecting the engagement of the steel strand a1.

Preferably, in order to prevent the end face collision between the steel strand A1 and the anchor hole 11 from influencing the strength and the service life of the steel strand A1, a protective lining 16 is laid on the inner wall surface of the small-bore section at the outer end of the anchor hole 11, and the protective lining 16 is made of a non-metal material.

Furthermore, the blocking surface 112 or the anchorage device located outside the blocking surface 112 forms a sealing fit with the tendon a. Therefore, reliable corrosion prevention of the prestressed tendon A can be realized only by filling the anchor with the corrosion-prevention medium which is filled in the cavity where the exposed steel strand A1 is located.

Preferably, the outer peripheral wall of the outer sheath A2 and the inner wall of the anchorage device form sealing fit, so that the sealing performance of the cavity where the exposed steel strand A1 is located can be guaranteed, and corrosion prevention failure caused by leakage of a corrosion prevention liquid is avoided. Specifically, a sealing ring 14 is arranged on the outer side of the blocking surface 112, the inner ring surface of the sealing ring 14 is in sealing fit with the outer peripheral surface of the outer sheath A2, and the outer surface of the sealing ring 14 is in surface sealing fit with the anchor. The outer surface of the sealing ring 14 includes inner and outer end surfaces and an outer ring surface, specifically, as shown in fig. 2, the outer end surface of the sealing ring 14 and the inner end surface of the pressure plate 40 form a sealing fit, and as shown in fig. 3, the outer ring surface of the sealing ring 14 and the pressure plate 40 form a sealing fit.

Preferably, a separating ring 15 is arranged between the blocking surface 112 and the sealing ring 14, and the inner diameter of the separating ring 15 is larger than or equal to the outer diameter of the outer sheath A2. When the end face of the outer sheath A2 is chamfered, the separating ring 15 can accommodate the chamfer of the outer sheath A2 so as to ensure the sealing effect of the sealing ring 14 and the outer sheath A2.

Specifically, the outer side of the anchor plate 10 is fixedly connected with a pressing plate 40, the pressing plate 40 is provided with a through hole 41 which is coaxially arranged with the anchor hole 11, the hole end of the through hole 41 adjacent to the anchor plate 10 is in a step hole shape with a large outer hole diameter and a small inner hole diameter, and the separating ring 15 and the sealing ring 14 are embedded in the large hole diameter section 411.

In another embodiment, as shown in fig. 4, a sealing ring 14 is coaxially arranged outside the retaining ring 12, an inner ring surface of the sealing ring 14 forms a sealing fit with the outer peripheral surface of the outer sheath a2, an outer surface of the sealing ring 14 forms a surface sealing fit with the anchorage device, the outer end of the anchoring hole 11 is provided with a deviation rectifier 30, one end of the deviation rectifier 30 extends into the anchoring hole 11, the inner end surface of the deviation rectifier 30 is arranged at a distance from the outer end surface of the retaining ring 12, and the sealing ring 14 is embedded in the deviation rectifier 30, so that the sealing ring 14 and the outer sheath a2 with complete peripheral parts can form an effective surface sealing fit.

As shown in fig. 5-7, the retainer ring 12, the seal ring 14, and the spacer ring 15 may be plate-shaped structures provided with through holes or other shapes.

Claims

1. The utility model provides a stretch-draw end ground tackle, includes anchor slab (10), is equipped with anchor hole (11) that supply prestressing tendons (A) to pass on anchor slab (10), and the inner of anchor hole (11) is big, the little taper hole (111) of inboard in the outside, and taper hole (111) conform with the periphery shape of clamping piece (20), its characterized in that: the front end of the taper hole (111) is provided with a blocking surface (112) which is abutted and matched with the end surface of the outer sheath (A2) of the prestressed tendon (A), and the blocking surface (112) is provided with a hole for the steel strand (A1) to pass through.

2. The tension end anchor of claim 1, wherein: the inner wall face and/or the opening edge of the outer end of the anchoring hole (11) are/is provided with a retaining ring (12), the outer end face of the retaining ring (12) forms a blocking face (112) which is abutted against and matched with the end face of the outer sheath (A2) of the prestressed tendon (A), and a hole in the middle of the retaining ring (12) is used for the steel strand (A1) of the prestressed tendon (A) to pass through.

3. The tension end anchor of claim 2, wherein: the outer end of the anchoring hole (11) is in a stepped hole shape with a large outer side aperture and a small inner side aperture, and the inner end face of the retainer ring (12) is connected with the stepped face (13) in an abutting mode.

4. The tension end anchor of claim 2, wherein: the retainer ring (12) is made of non-metal materials.

5. The tension end anchor of claim 1, wherein: the outer end of the anchoring hole (11) is in a stepped hole shape with small outside aperture and large inside aperture, and the outer end surface of the anchoring hole forms a blocking surface (112) which is abutted and matched with the end surface of the outer sheath (A2) of the prestressed tendon (A).

6. The tension end anchor of claim 5, wherein: and a protective lining (16) is laid on the inner wall surface of the small-aperture section at the outer end of the anchoring hole (11), and the protective lining (16) is made of a non-metal material.

7. A tension end anchor according to claim 1 or 5, wherein: the blocking surface (112) or an anchorage device positioned outside the blocking surface (112) is in sealing fit with the prestressed tendon (A).

8. The tension end anchor of claim 7, wherein: the outer peripheral wall of the outer sheath (A2) is in sealing fit with the inner wall of the anchorage device, a sealing ring (14) is arranged on the outer side of the blocking surface (112), the inner ring surface of the sealing ring (14) is in sealing fit with the outer peripheral surface of the outer sheath (A2), and the outer surface of the sealing ring (14) is in surface sealing fit with the anchorage device.

9. The tension end anchor of claim 8, wherein: a separating ring (15) is arranged between the blocking surface (112) and the sealing ring (14), and the inner diameter of the separating ring (15) is larger than or equal to the outer diameter of the outer sheath (A2).

10. The tension end anchor of claim 9, wherein: the outer side of the anchor plate (10) is fixedly connected with a pressing plate (40), a through hole (41) which is coaxial with the anchoring hole (11) is formed in the pressing plate (40), the hole end, close to the anchor plate (10), of the through hole (41) is in a step hole shape with a large outer hole diameter and a small inner hole diameter, and the separating ring (15) and the sealing ring (14) are embedded in the large hole diameter section (411).

11. The tension end anchor of claim 5, wherein: sealing ring (14) have been arranged to the outside coaxial of retaining ring (12), the inner circle face of sealing ring (14) constitutes sealed cooperation with the outer peripheral face of oversheath (A2), the surface of sealing ring (14) constitutes face seal cooperation with the ground tackle, the outer end of anchor hole (11) is equipped with rectifier (30), rectifier (30)'s one end extends into in anchor hole (11) and its interior terminal surface and the outer terminal surface interval arrangement of retaining ring (12), sealing ring (14) are inlayed and are located rectifier (30).