CN106760592B - Anchoring device - Google Patents

Anchoring device Download PDF

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Publication number
CN106760592B
CN106760592B CN201611010484.3A CN201611010484A CN106760592B CN 106760592 B CN106760592 B CN 106760592B CN 201611010484 A CN201611010484 A CN 201611010484A CN 106760592 B CN106760592 B CN 106760592B
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China
Prior art keywords
concrete
anchor plate
fiber
fiber cloth
anchoring device
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CN201611010484.3A
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Chinese (zh)
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CN106760592A (en
Inventor
陈光明
张俊杰
刘伟楠
姜涛
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Guangdong Provincial Architectural Engineering Machinery Construction Co Ltd
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Guangdong Provincial Architectural Engineering Machinery Construction Co Ltd
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Publication of CN106760592A publication Critical patent/CN106760592A/en
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0225Increasing or restoring the load-bearing capacity of building construction elements of circular building elements, e.g. by circular bracing
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0262Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The invention provides an anchoring device which consists of a sliding rod and an anchor plate, wherein the sliding rod and the anchor plate can slide along a sliding groove, the sliding rod can reciprocate in the anchor plate along the sliding groove, the sliding groove is arranged at the upper edge and the lower edge of the anchor plate, one end of fiber cloth is fixed on the sliding rod, and the sliding rod is pulled by the fiber cloth to slide along the sliding groove for a certain distance along the stress direction after being stressed, so that the fiber cloth is pressed on the outer surface of a concrete column. The lap joint force transmission between the fiber cloths is realized through the self-locking anchoring of the fiber cloths in the anchor plate, so that the problem that the fiber material constraint reinforcing effect is rapidly reduced or even fails due to the fact that the adhesive is softened or even fails under the action of high temperature when the fiber reinforced composite material is reinforced with the column is conveniently and efficiently solved.

Description

Anchoring device
Technical Field
The invention belongs to the technical field of reinforced concrete structures, and particularly relates to an anchoring device.
Background
The fiber reinforced composite material (Fibre Reinforced Polymer, FRP for short) is widely applied to reinforcement of concrete structures and other structures because of the advantages of high strength, corrosion resistance, light weight, convenient construction and the like. At present, in the structural reinforcement engineering, the form that FRP is externally attached to the surfaces of structural members such as beams, plates, columns and the like is mainly adopted to improve the bearing capacity of the structural members.
At present, a method for reinforcing a building structure by using FRP is generally to impregnate a fiber cloth with an adhesive material such as resin, adhere the fiber cloth to the surface of a structural member, and reinforce the structural member. Among them, most of resins commonly used in FRP reinforcement technology are inflammable and fusible polymer materials. Numerous studies have shown that FRP reinforcement members without fire protection will soften or decompose at higher temperatures (e.g., the softening point of conventional resins ranges from 80 to 120 ℃, if fully exposed to hot air without any protective measures, thermooxidative decomposition will generally occur at 180 to 200 ℃, and when the temperature reaches 450 ℃, the epoxy resin will begin to burn, releasing black smoke and toxic gases, causing secondary pollution), and bond failure will occur easily at the FRP overlap joint, resulting in a substantial reduction in the load carrying capacity of the entire member. The above problem is one of the main problems faced by FRP for reinforcing building structures. In order to solve the above problems, the invention patent with publication number CN 105715070A proposes that the head end and the tail end of the carbon fiber strip are respectively pressed, wound and entangled to realize self-locking anchoring, and the flammable and combustible adhesive is not required to be used as a bonding material, so that the carbon fiber strip can still form a better constraint function on the structural member under high-temperature damage. The problems of reduced structural reinforcement bearing capacity and failure caused by failure of the adhesive and the fiber matrix material under the action of high temperature such as fire and the like are solved by utilizing the self-locking anchoring mode of the fiber strips; however, the anchoring method has a certain difficulty in application, and is mainly characterized in that the actual operation process is complicated, and the method is only suitable for the condition that the width of the fiber strip used for reinforcement is small; the self-anchoring difficulty is increased when the fiber strip is wider, and the self-anchoring effect is weakened. The invention patent with publication number of CN 104631853A proposes a fiber reinforced composite material anchoring device for reinforcing a concrete structure, which is based on the principle that an anchor plate rotates around a certain direction in a reserved slot after fiber cloth is stressed, so that the anchor plate and two side walls of the slot form pressure to realize self-locking anchoring of the anchor plate in the slot, and adhesive fastening materials are injected into the gap positions of the periphery of the anchor plate in the slot, so that the anchor plate is fixed in the reserved slot. The above patent delays or avoids the peeling damage of the external FRP reinforced concrete structure, increases the utilization rate of FRP materials, and enhances the effect of the external FRP reinforced structure, however, the device mainly solves the anchoring problem of FRP in concrete, does not solve the non-bonding overlap joint problem of fiber reinforced composite materials, and is mainly applied to reinforced concrete beams. The invention patent with publication number of CN 101949198B provides a parallel rod type anchoring device which can simply and efficiently realize firm clamping of a tensile flexible sheet without bonding or sewing the flexible sheet, but the device also mainly solves the anchoring problem of the fiber reinforced sheet in a structural member and does not solve the problem of non-bonding lap joint of the fiber reinforced composite materials. Similar problems exist with other fiber reinforced composite anchoring devices or methods (e.g., CN 105275219A, CN 101929250B, CN 101929253B, CN 101929254B).
Disclosure of Invention
Based on the defect of high temperature resistance when the fiber reinforced composite material is used for building structure reinforcement, the fiber reinforced composite material constraint concrete column anchoring device with the rotating plate is provided, so that the fiber cloth can be self-locked and anchored in the anchor plate, and the unbonded lap joint force transmission of the fiber cloth is realized. According to the actual engineering needs, the anchoring device can realize standardized customization, and is convenient to construct and apply. .
The invention provides an anchoring device which consists of a sliding rod and an anchor plate, wherein the sliding rod and the anchor plate can slide along a sliding groove, the sliding rod can reciprocate in the anchor plate along the sliding groove, the sliding groove is arranged at the upper edge and the lower edge of the anchor plate, one end of fiber cloth is fixed on the sliding rod, and the sliding rod is pulled by the fiber cloth to slide along the sliding groove for a certain distance along the stress direction after being stressed, so that the fiber cloth is pressed on the outer surface of a concrete column.
In one embodiment, the number of the sliding rods is at least 2, and the sliding rods are arranged in an axisymmetric manner by taking the central axis of the anchor plate as a symmetry axis.
In one embodiment, the fiber cloth is vertically wound on the outer surface of the concrete column, or the fiber cloth is spirally wound on the outer surface of the concrete column.
In one embodiment, the concrete column is wound with additional fiber cloth in the radial direction, and the additional fiber cloth is used for fixing the fiber cloth spirally wound on the surface of the concrete column.
In one embodiment, the anchor plate and the sliding rod are made of a high-temperature resistant material which can be processed and formed and is not easy to deform.
In one embodiment, the fiber material of the anchored fiber cloth is one or a combination of more than one of carbon fiber, glass fiber, aramid fiber and basalt fiber.
In one embodiment, the distribution of the through holes of the anchor plate is that the number of long-side open holes m is more than or equal to 3, and the number of short-side open holes n is more than or equal to 1.
In one embodiment, the concrete of the concrete column is one of ordinary strength concrete, high strength concrete, expanded concrete, fly ash concrete, lightweight aggregate concrete, recycled aggregate concrete, fiber concrete, self-compacting concrete and rubber concrete. .
In one embodiment, the anchor plate is a planar plate or a curved plate.
In one embodiment, the fiber cloth is adhered to the outer surface of the concrete column through an adhesive material or a cement-based material.
The beneficial effects of the invention are as follows:
1. the lap joint force transmission between the fiber cloths is realized through the self-locking anchoring of the fiber cloths in the anchor plate, so that the problem that the fiber material constraint reinforcing effect is rapidly reduced or even fails due to the fact that the adhesive is softened or even fails under the action of high temperature when the fiber reinforced composite material is reinforced with the column is conveniently and efficiently solved. The anchor plate material can be a metal plate, a non-metal plate, an alloy or other high-temperature resistant materials which can be processed and formed and are not easy to deform, can realize standardized customization according to actual engineering requirements, and has good moldability; the reinforcing procedure related by the technology is simple and the construction is convenient.
2. The self-locking function of the anchor plate on the fiber cloth is utilized to apply prestress on the fiber cloth, the high-strength performance of the fiber reinforced composite material is fully utilized, and the structural reinforcement efficiency is improved.
3. The invention can also promote the application of the high-performance composite material in civil engineering.
Drawings
The invention is further described below with reference to the accompanying drawings, which are not to be construed as limiting the invention in any way.
FIG. 1 is a schematic view of an anchoring device provided by an embodiment of the present invention applied to a reinforced concrete column with FRP strips spirally wound;
FIG. 2 is a schematic view of an anchoring device provided by an embodiment of the present invention applied to a FRP vertically wound reinforced concrete column;
FIG. 3a is a schematic view of an anchoring device applied to an FRP constraint reinforcement square column with an rounded angle according to an embodiment of the present invention;
FIG. 3b is a schematic view of an anchoring device according to an embodiment of the present invention applied to a FRP constraint reinforcement belt rounded angle rectangular column;
FIG. 3c is a schematic view of an anchoring device applied to FRP constraint reinforced circular columns according to an embodiment of the present invention;
FIG. 3d is a schematic view of an anchoring device applied to an FRP constraint reinforced oval column according to an embodiment of the present invention;
FIG. 4a is a schematic view of an anchor plate according to an embodiment of the present invention;
FIG. 4b is a cross-sectional view of an arcuate anchor plate provided by an embodiment of the present invention;
FIG. 4c is a cross-sectional view of a planar anchor plate provided by an embodiment of the present invention;
FIG. 5 is a plan view of an anchor plate aperture distribution provided by an embodiment of the present invention;
FIG. 6 is a cross-sectional view of an anchor plate aperture distribution provided by an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of an anchor plate surface roughness provided by an embodiment of the present invention;
FIG. 8 is a perspective view of an anchor plate structure provided by an embodiment of the present invention;
FIG. 9 is a schematic illustration of the shape of a runner in an anchor plate provided by an embodiment of the present invention;
FIG. 10 is a schematic view of the cross-sectional shape of a sliding bar in an anchor plate provided by an embodiment of the present invention;
FIG. 11a is a schematic illustration of an embodiment of the present invention in which a fiber cloth is wrapped around an anchor plate once;
FIG. 11b is a schematic illustration of an embodiment of the present invention in which a fiber cloth is wrapped around an anchor plate twice;
FIG. 12 is a schematic view of the movement trend of a fiber cloth according to an embodiment of the present invention;
wherein:
1-a fiber cloth; 2-anchor plate; 3-reinforcing the concrete column; 4-a sliding rod.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 and 2, the embodiment provides a fiber reinforced composite material constraint concrete column anchoring device with a sliding rod, which comprises a sliding rod 4 and an anchor plate 2, wherein the sliding rod 4 and the anchor plate 2 can slide along a sliding groove, the sliding groove is arranged on the edge of the anchor plate 2, and the anchor plate 2 is used for self-locking fixation or lap joint of fiber cloth 1 when a concrete column 3 is reinforced. During construction, the fiber cloth 1 is tensioned and the anchor plate 2 is tensioned, so that the sliding rod 4 in the anchor plate 2 slides a certain distance along the sliding groove along the stress direction after the fiber cloth 1 is stressed, and the sliding rod 4 is tightly pressed on the fiber cloth 1 at the moment, so that preliminary self-locking fixation is realized; when the concrete column 3 receives an axial load, the fiber cloth 1 and the anchor plate 2 are tightly attached to the concrete column 3 due to the fact that the transverse expansion of the concrete material in the concrete column 3 generates further deformation and the fiber cloth and the anchor plate generate tension self-stress; friction forces are generated between the fiber cloth 1 and the concrete column 3, between the fiber cloth 1 and the fiber cloth 1, between the anchor plate 2 and the fiber cloth 1 and between the sliding rod 4 and the fiber cloth 1 due to stress balance; when the anchor plate 2 is a curved plate, the contact surface of the anchor plate 2 with the concrete column 3 will also generate a normal pressure, the presence of which can effectively increase the above-mentioned friction; in addition, the sliding rod 4 in the anchor plate 2 can generate additional contact surface pressure on the contact surface of the fiber cloth 1 and the concrete column 3, and the existence of the pressure can not only effectively increase the friction force between the fiber cloth 1 and the concrete column 3, but also more effectively enable the fiber cloth 1 to be closely attached to the concrete column 3, so that a stable self-locking anchoring structure is formed. The anchoring device has good anchoring effect, and can conveniently and efficiently solve the problems that the fiber material constraint reinforcing effect is rapidly reduced or even fails due to the fact that the adhesive material is softened or even fails under the high temperature effect when the fiber reinforced composite material is used for reinforcing the column; the anchorage device has good moldability and can be standardized and customized; the anchoring system has the advantages of simple construction, easy operation and control, and can be better applied to reinforcement of actual building structures and other structures.
The fiber material of the fiber cloth 1 can be one or a combination of more than one of carbon fiber, glass fiber, aramid fiber and basalt fiber; the concrete column 3 can be one of ordinary strength concrete, high-strength concrete, expanded concrete, fly ash concrete, lightweight aggregate concrete, recycled aggregate concrete, fiber concrete, self-compacting concrete and rubber concrete; the materials of the anchor plate 2 and the sliding rod 4 can be metal plates, nonmetal plates, alloys or other high temperature resistant materials which can be processed and formed and are not easy to deform.
The anchoring means may be provided in a plurality of side-by-side forms (as shown in figures 1, 2) or in one single piece covering a larger width; the anchoring device can be applied to FRP constraint square columns (shown in figure 3 a), FRP constraint rectangular columns (shown in figure 3 b), FRP constraint circular columns (shown in figure 3 c) or FRP constraint elliptical columns (shown in figure 3 d); the anchor plate 2 may be a curved plate (as shown in fig. 4 b) or a planar plate (as shown in fig. 4 c).
The anchor plate 2 is provided with at least 3 through holes along its long side direction and at least 1 through hole along its short side direction (as shown in fig. 5).
In the actual construction process, the contact area between the fiber cloth 1 and the concrete column 3 or the anchor plate 2 can be increased by increasing the number of holes of the anchor plate 2 (fig. 5) and the winding number of the fiber cloth 1 on the anchor plate 2 (fig. 11 and 12), so that the anchoring effect is increased.
The thickness of the contact part between the surface of the anchor plate 2 and the fiber cloth is smaller than that of the non-contact part between the surface of the anchor plate 2 and the fiber cloth (as shown in fig. 7 and 8), the grooving depth is determined according to the whole thickness of the fiber cloth 1 wound around the anchor plate 2, and the grooving depth is not excessively large so as not to influence the anchoring effect.
At least 2 sliding rods are arranged in the anchor plate in an axisymmetric way by taking the center line of the anchor plate as a symmetry axis (as shown in figure 6); meanwhile, the requirements of actual production and construction are considered, the section shape of the sliding rod can be one of a round shape, a rectangle with an arc angle and a square shape (shown in fig. 10), and the trend of the sliding groove can be one of a linear shape, an arc shape and an S shape (shown in fig. 9).
In this embodiment, the steps for implementing the above-mentioned anchoring device are as follows:
winding the fiber cloth 1 on the part to be reinforced by the reinforced column 3, winding the two end parts of the fiber cloth 1 on the anchor plate 2 and tensioning, and simultaneously, pulling the sliding rod 4 in the anchor plate by the fiber cloth 1 to slide for a certain distance along the sliding chute along the stress direction after the fiber cloth 1 is stressed, so that the fiber cloth 1 forms self-locking; when necessary, the end of the fiber cloth 1 may be wound around the anchor plate 2 a plurality of times (as shown in fig. 11, 12).
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (8)

1. An anchoring device, characterized in that: the anchoring device consists of a sliding rod and an anchor plate, wherein the sliding rod can slide along a sliding groove, the sliding rod can reciprocate in the anchor plate along the sliding groove, the sliding groove is arranged at the upper edge and the lower edge of the anchor plate, one end of fiber cloth is fixed on the sliding rod, and the sliding rod slides along the sliding groove for a certain distance along the stress direction under the traction of the fiber cloth after the fiber cloth is stressed, so that the fiber cloth is pressed on the outer surface of the concrete column;
the sliding rods are at least 2 and are arranged in an axisymmetric way by taking the central axis of the anchor plate as a symmetry axis; the distribution condition of the through holes of the anchor plate is that the number of long-side open holes m is more than or equal to 3, and the number of short-side open holes n is more than or equal to 1.
2. The anchoring device of claim 1, wherein: the fiber cloth is vertically wound on the outer surface of the concrete column, or the fiber cloth is spirally wound on the outer surface of the concrete column.
3. The anchoring device of claim 2, wherein: and the additional fiber cloth is wound in the radial direction of the concrete column and is used for fixing the fiber cloth spirally wound on the surface of the concrete column.
4. The anchoring device of claim 1, wherein: the anchor plate and the rotating plate are made of high-temperature resistant materials which can be processed and formed and are not easy to deform.
5. The anchoring device of claim 1, wherein: the anchored fiber cloth is made of one or more of carbon fiber, glass fiber, aramid fiber and basalt fiber.
6. The anchoring device of claim 1, wherein: the concrete of the concrete column is one of common strength concrete, high-strength concrete, expanded concrete, fly ash concrete, lightweight aggregate concrete, recycled aggregate concrete, fiber concrete, self-compacting concrete and rubber concrete.
7. The anchoring device of claim 1, wherein: the anchor plate is a plane plate or a curved plate.
8. The anchoring device of claim 1, wherein: the fiber cloth is adhered to the outer surface of the concrete column through an adhesive material or a cement-based material.
CN201611010484.3A 2016-11-17 2016-11-17 Anchoring device Active CN106760592B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN106760592B true CN106760592B (en) 2023-11-10

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109518853A (en) * 2018-11-19 2019-03-26 上海建工五建集团有限公司 A kind of built-in fitting and installation method for curtain wall installation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2463363A1 (en) * 2004-04-07 2005-10-07 David T. Lau Anchorage system for structural reinforcement of fiber reinforced plastic materials and the like
CN101929494A (en) * 2010-09-01 2010-12-29 中南大学 Method for self-lock of flexible flaky material by turnstile
CN201933696U (en) * 2011-01-12 2011-08-17 北京交通大学 High-strength fiber material self-locking anchor device
CN206737460U (en) * 2016-11-17 2017-12-12 广东工业大学 A kind of anchor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2463363A1 (en) * 2004-04-07 2005-10-07 David T. Lau Anchorage system for structural reinforcement of fiber reinforced plastic materials and the like
CN101929494A (en) * 2010-09-01 2010-12-29 中南大学 Method for self-lock of flexible flaky material by turnstile
CN201933696U (en) * 2011-01-12 2011-08-17 北京交通大学 High-strength fiber material self-locking anchor device
CN206737460U (en) * 2016-11-17 2017-12-12 广东工业大学 A kind of anchor

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