CN103669208B - A kind of anchoring process being applicable to large-tonnage FRP inhaul cable - Google Patents
A kind of anchoring process being applicable to large-tonnage FRP inhaul cable Download PDFInfo
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- CN103669208B CN103669208B CN201310645316.1A CN201310645316A CN103669208B CN 103669208 B CN103669208 B CN 103669208B CN 201310645316 A CN201310645316 A CN 201310645316A CN 103669208 B CN103669208 B CN 103669208B
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- inhaul cable
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Abstract
The invention discloses a kind of anchoring process being applicable to more than 50 tons large-tonnage FRP inhaul cable; strand tapered anchorage is adopted to carry out anchoring to FRP inhaul cable; the anchored end of described FRP inhaul cable be formed a length be not less than described strand tapered anchorage anchorage zone length, protect transition zone with FRP inhaul cable all-in-one-piece, and strand tapered anchorage be anchored at protect on transition zone.After FRP inhaul cable and topping are molded into entirety; while the shear strength increasing FRP inhaul cable and topping interface; the direct load Transfer Medium very large with rigidity contacts in anchorage zone can to avoid the more weak FRP inhaul cable of transverse strength; form a stressed cushion coat, play the effect of indirect protection FRP inhaul cable.The anchoring process that the present invention is used for FRP inhaul cable has easy construction, anchoring efficiency advantages of higher, the long-term behaviour of anchoring system can be ensured, also can be used for the tension test of FRP inhaul cable, sample prepares simple and convenient, can avoid the testing error brought because resin shear strain is excessive compared with bonded anchoring process.
Description
Technical field
The present invention relates to the anchoring field of the infrastructure architecture drag-lines such as civil engineering, traffic, energy environment, particularly relate to the anchor-hold technology adopting fibre reinforced composites to prepare.
Background technology
Fibre reinforced composites (FiberReinforcedPolymer, be called for short FRP) have the advantages such as high-strength, light weight, corrosion-resistant and endurance.FRP inhaul cable is by silvalin impregnating resin by a certain percentage, by the composite material that pultrude process is shaping, is the ideal substitute of reinforcing bar and cable wire in applications in civil engineering, is applied at present in bridge, hydraulic structure, sea port dock and stabilization works.
Although FRP inhaul cable is used for field of civil engineering wide prospect, the anchoring system of practical engineering need perfect, and especially for major diameter large-tonnage FRP inhaul cable, safe and reliable anchoring system is also not full-fledged.Existing FRP inhaul cable ground tackle is mainly divided into bonded and clip type two kinds.
Bond type anchorage depends on the ability that shear strain resisted by binding material (being generally resin), the advantage of this anchoring process is that binding material is to FRP inhaul cable body not damaged, standard FRP muscle/rope material tension test generally just adopts this method, and specific practice is that perfusion resin waits for that resin solidification can obtain test specimen in straight sleeve.There is the deficiencies such as the long and long-term behaviour of process for filling colloid complexity, resin curing time is poor in this anchoring process, especially the modulus of elasticity of resin is minimum will cause self shear strain excessive, will introduce in test the error of can not ignore, and affect result of the test.
Strand tapered anchorage is common in the anchoring of prestress wire, and the wedge shaped squeeze power produced by tapered steel intermediate plate and steel anchor cup clamps steel strand, has easy construction, anchoring efficiency advantages of higher.But the FRP inhaul cable of Mechanical Property Anisotropy compressive strength in the horizontal and shear strength lower, only have 1/10-1/20 of longitudinal tensile strength, steel clamp sheet and FRP inhaul cable can be suddenlyd change because of rigidity and be caused FRP inhaul cable radial surface compressive stress and shear stress concentration, radial compressive stress is crossed conference and is caused FRP inhaul cable in anchorage zone, produce local compression destruction, i.e. " notch effect ", before the tensile strength that not yet reaches capacity, FRP inhaul cable just produces disrumpent feelings at load-bearing top, anchorage zone.FRP inhaul cable surface shear stress is crossed conference and is caused drag-line slippage from ground tackle.Above-mentioned two kinds of stress concentrate the failure mode caused all will to cause the premature failure of FRP inhaul cable clip type anchoring system, greatly reduce the anchoring efficiency of ground tackle.
Existing anchoring process for single minor diameter FRP muscle material, is applicable to little span structure mostly, and therefore the anchoring of major diameter FRP inhaul cable is the bottleneck problem of its extensive use in Important Project of restriction.In order to better play the advantage of FRP inhaul cable in middle large-span structure, certainly will need to develop many, large-tonnage, large diameter FRP inhaul cable anchoring system.
Summary of the invention
Goal of the invention: can only anchoring minor diameter FRP inhaul cable for bonded anchoring process, in clip type anchoring process, FRP inhaul cable and steel clamp sheet there will be the concentrated problem of stress because rigidity is suddenlyd change, need a kind of easy construction, can anchoring efficiency be improved, the ground tackle method of the FRP inhaul cable of anchoring system long-term behaviour can be ensured again.
Technical scheme: for solving the problems of the technologies described above, the anchoring process that the present invention is used for FRP inhaul cable is:
A kind of anchoring process being applicable to more than 50 tons large-tonnage FRP inhaul cable; strand tapered anchorage is adopted to carry out anchoring to FRP inhaul cable; it is characterized in that: the anchored end of described FRP inhaul cable be formed a length be not less than described strand tapered anchorage anchorage zone length, protect transition zone with FRP inhaul cable all-in-one-piece, and strand tapered anchorage be anchored at protect on transition zone.After FRP inhaul cable and topping are molded into entirety; while the shear strength increasing FRP inhaul cable and topping interface; the direct load Transfer Medium very large with rigidity contacts in anchorage zone can to avoid the more weak FRP inhaul cable of transverse strength; form a stressed cushion coat, play the effect of indirect protection FRP inhaul cable.
Described protection transition zone is that longitudinally or with longitudinally having an angle to wrap up the fiber roving of pre-soaked resin shaping by mould pressing process on FRP inhaul cable surface, and fiber roving is carbon fiber, basalt fibre or fibre glass roving.
Described protection transition zone is around FRP inhaul cable, be evenly arranged at least two-layer minor diameter FRP muscle/rope, minor diameter FRP muscle/rope from internal layer to skin according to the arrangement of gradients that length and diameter all reduce.When the FRP inhaul cable diameter of anchoring is larger, protection transition zone adopts the method for the minor diameter FRP muscle/rope of arrangement of gradients.
The protection thickness of transition zone and the diameter ratio of FRP inhaul cable are 0.1 ~ 0.7.
Described FRP inhaul cable is the FRP inhaul cable in surface FRP inhaul cable with ribbing or light face, and FRP inhaul cable is single or many, and the many parallel compositions of FRP inhaul cable or strand are twisted with the fingers and formed.
Described strand tapered anchorage comprises load Transfer Medium and metal sleeve, and the external surface carrying Transfer Medium is taper, and dynamic changes process medium is that inner side has the metal intermediate plate intermediate plate of recessed tooth, solidifies the expanding material of rear volume expansion or have the material of radial rigidity change; Described metal sleeve is a kind of outer for there being the structure of taper hole in cylinder, and the angle of taper hole is identical with the tapering of load Transfer Medium external surface.Load Transfer Medium outward appearance is taper, for transmitting anchorage zone stress, inner side can be selected to have the steel clamp sheet of recessed tooth, also can select the expanding material of the rear volume expansion of solidification, can also select the material with radial rigidity change.Have recessed tooth inside steel clamp sheet, recessed tooth can produce mechanical snap power with the protection transition zone of compression molding, thus increases anchored force, ensures the FRP inhaul cable after mold pressing and protects transition zone and steel clamp sheet co-operation; Expand after expanding material solidifies between sleeve pipe and FRP inhaul cable, great interface normal pressure is produced to internal surface of sleeve pipe, thus the frictional force increased on FRP inhaul cable-expanding material and expanding material-sleeve pipe two interfaces realizes anchoring; The material with radial rigidity change can reduce the peak stress at load-bearing top, anchorage zone effectively, is conducive to stressed in anchorage zone of anisotropy FRP inhaul cable, can anchoring many major diameter FRP inhaul cable.The internal taper hole angle of steel bushing is identical with the tapering that load transmits material, and steel bushing can transmit material tight with load to be agreed with, and relies on wedge shape anchor mechanism to produce and extrudes anchored force fully.
Beneficial effect: the present invention is used for the anchoring process of large-tonnage FRP inhaul cable, utilize the mechanism of clip type anchoring system tapered squeezing anchoring, the wedge shaped squeeze power relying on the steel bushing of band inner cone and taper load Transfer Medium to produce provides anchored force, can ensure the effective clamping to FRP inhaul cable.Anchoring process advantage for large-tonnage FRP inhaul cable of the present invention is given prominence to:
First; the present invention can effectively avoid traditional strand tapered anchorage to suddenly change and cause the local compression of FRP inhaul cable to destroy due to FRP material and steel clamp sheet rigidity; i.e. " notch effect "; introduce and protect at drag-line peripheral with the pre-latex bonded fibre rove of FRP inhaul cable material homology; as stressed cushion coat; the FRP inhaul cable that indirect protection transverse strength is more weak, have good with FRP inhaul cable interfacial bond property, increase the advantages such as Stress transmit.Can effectively improve FRP inhaul cable anchoring efficiency after taking above-mentioned measure, especially can effectively reduce the notch effect at load-bearing top, anchorage zone when anchoring tonnage reaches more than 50 tons, give full play to the high strength of FRP inhaul cable, ensure the long-term behaviour of anchoring system;
Secondly; the smooth surface of light face FRP inhaul cable; interface friction force deficiency causes traditional anchoring process very easily to produce stripped thread phenomenon when anchoring; the topping of compression molding in the present invention and inner side have the steel clamp sheet of recessed tooth on interface, produce mechanical snap power, and don't can cause damage to FRP inhaul cable itself.So the present invention effectively can solve the anchoring bottleneck of light face FRP inhaul cable;
Finally, mould pressing process is simple and convenient, and molded product smooth surface is clean and tidy, shape of cross section is very regular.Mould pressing process makes FRP inhaul cable and topping form entirety; for the standard pull tension strength test of FRP muscle/rope on the fixture that directly can be clamped in testing machine; sample prepares convenient and time-saving, can avoid the testing error brought because resin shear strain is excessive compared with bonded anchoring process.
Accompanying drawing explanation
Fig. 1 is the anchor device structure schematic diagram of embodiments of the invention one.
Fig. 2 is the winding fiber anchoring schematic diagram of embodiments of the invention one.
Fig. 3 is the steel clamp chip architecture schematic diagram of embodiments of the invention one.
Fig. 4 is the steel anchor cup structure schematic diagram of embodiments of the invention one.
Fig. 5 is the notch effect schematic diagram of FRP inhaul cable anchoring system.
Fig. 6 is the anchor device structure schematic diagram of embodiments of the invention two.
Fig. 7 is the anchor device structure schematic diagram of embodiments of the invention three.
Fig. 8 is load Transfer Medium modulus of elasticity schematic diagram.
Fig. 9 is the distribution curve of FRP inhaul cable radial surface compressive stress in anchorage zone.
Figure 10 is the distribution curve of FRP inhaul cable radial surface shear stress in anchorage zone.
Figure 11 is the anchor device structure schematic diagram of embodiments of the invention four.
Figure 12 is the ground tackle schematic cross-section of embodiments of the invention four.
Figure 13 is the FRP muscle/rope test for tensile strength schematic diagram of embodiments of the invention five.
Figure 14 is the structural representation of FRP inhaul cable.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Embodiment 1: refer to shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5.Fig. 1 is of the present invention for FRP inhaul cable anchor device structure schematic diagram, Fig. 2 is the winding fiber anchoring schematic diagram of embodiments of the invention one, Fig. 3 is the steel clamp chip architecture schematic diagram of embodiments of the invention one, Fig. 4 is the steel anchor cup structure schematic diagram of embodiments of the invention one, and Fig. 5 is the notch effect schematic diagram of FRP muscle/rope anchoring system.Load Transfer Medium that the present embodiment uses 300 is steel clamp sheet 3, comprises FRP inhaul cable 1, the topping 2 of compression molding, tapered steel intermediate plate 3 and steel bushing 4.First at the fiber roving 6 of FRP inhaul cable surface wrap pre-soaked resin 5; the winding number of plies different according to the different choice of anchoring FRP inhaul cable diameter; pass through mould pressing process; after FRP inhaul cable 1 and protection transition zone 2 are molded into entirety; FRP inhaul cable 1 has high shear strength with protection transition zone 2 interface, and the FRP inhaul cable 1 that transverse strength can be avoided more weak directly contacts with cone-shaped clip 3 in anchorage zone, forms a stressed cushion coat; avoid notch effect, play the effect of indirect protection FRP inhaul cable.Again by being divided into two, inner side has protection transition zone 2 surface that recessed tooth tapered steel intermediate plate 3 is clamped in compression molding, recessed tooth can produce mechanical snap power with the protection transition zone 2 of compression molding, thus increases anchored force.Finally said modules is penetrated in steel bushing, steel bushing 4 has internal taper hole, interior coning angle is consistent with the tapering of cone-shaped clip 3, closely can agree with cone-shaped clip 3, rely on wedge shape anchor mechanism to produce and extrude anchorage effect fully, steel bushing is provided with external screw thread, can be connected by external screw thread with external structure.
Embodiment 2: refer to shown in Fig. 6.Its basic structure is with embodiment 1, and institute's difference is that described load Transfer Medium 3 is expanding material 5.First at the fiber roving of FRP inhaul cable surface wrap pre-soaked resin; the winding number of plies different according to the different choice of anchoring FRP inhaul cable diameter; shaping by mould pressing process; after FRP inhaul cable 1 and topping 2 are molded into entirety; FRP inhaul cable 1 has high shear strength with protection transition zone 2 interface, forms a stressed cushion coat indirect protection FRP inhaul cable.Be with to protect between the FRP inhaul cable 1 of transition zone 2 again after steel anchor cup 4 and mold pressing and pour into expanding material 5, the interface normal pressure produced after relying on expanding material 5 setting expansion provides anchored force, namely forms a FRP inhaul cable anchoring system.
Embodiment 3: refer to shown in Fig. 7.Its basic structure is with embodiment 1, and institute's difference is that described load Transfer Medium 3 is for having the material 6 of radial rigidity change.Fig. 8, Fig. 9, Figure 10 are the distribution curve of FRP inhaul cable radial surface compressive stress and shear stress, solid line is that the load not carrying out mechanical property design transmits materials A, dotted line is transmit material B according to the load of anchorage zone stress distribution design, carry out the peak stress that the anchoring system after mechanical property design can reduce load-bearing top, anchorage zone effectively, be conducive to stressed in anchorage zone of anisotropy FRP inhaul cable, can anchoring many FRP inhaul cable.
Embodiment 4: refer to shown in Figure 11 and Figure 12.Figure 11 is the anchor device structure schematic diagram of embodiments of the invention four, and Figure 12 is the ground tackle schematic cross-section of embodiments of the invention four.Its basic structure is with embodiment 2, and institute's difference is that described protection transition zone 2 is the minor diameter FRP inhaul cable 7 of arrangement of gradients around FRP inhaul cable 1.Pour into expanding material 5 between steel anchor cup 4 and FRP inhaul cable 1 again, after waiting expanding material 5 setting expansion, rely on interface normal pressure to provide anchored force, namely form a FRP inhaul cable anchoring system.
Embodiment 5: refer to shown in Figure 13,14.Figure 13 is of the present invention for FRP muscle/rope test for tensile strength schematic diagram; first longitudinally be wound around the fiber roving of pre-soaked resin with hoop on FRP muscle/rope 1 surface; shaping by mould pressing process; FRP muscle/rope 1 and protection transition zone 2 are molded into entirety; FRP muscle/rope 1 and the shear strength protecting transition zone 2 interface can be increased; form a stressed cushion coat, play the effect of indirect protection FRP muscle/rope 1.Then be clamped on the fixture 8 of testing machine, can test for tensile strength be carried out.
The present invention is directed to FRP inhaul cable transversely compressive strength and the more weak problem of shear strength, stress is concentrated to avoid FRP inhaul cable anchoring system to occur in anchorage zone, there is provided one to construct anchoring process simply and easily, improve anchoring efficiency, ensure the long-term behaviour of anchoring system.Adopt die press technology for forming that FRP inhaul cable and the pre-soaked resin fiber roving being wrapped in its surface are pressed into entirety, can effectively slow down load-bearing top, anchorage zone cone-shaped clip to the radial compressive stress on FRP inhaul cable surface and shear stress peak value as cushion coat, be conducive to stressed in anchorage zone of anisotropy FRP inhaul cable.The present invention can solve strand tapered anchorage and damage large problem to FRP, solve again the anchoring bottleneck of light face FRP inhaul cable simultaneously, more may be used for FRP inhaul cable test for tensile strength, sample prepares convenient and time-saving, can avoid the testing error brought because resin shear strain is excessive compared with bonded anchoring process.
Claims (6)
1. one kind is applicable to the anchoring process of large-tonnage FRP inhaul cable, strand tapered anchorage is adopted to carry out anchoring to FRP inhaul cable (1), it is characterized in that: the anchored end of described FRP inhaul cable be formed a length be not less than described strand tapered anchorage anchorage zone length, protect transition zone (2) with FRP inhaul cable all-in-one-piece, and strand tapered anchorage be anchored at protect on transition zone; Described protection transition zone (2) is that longitudinally or with longitudinally having an angle to wrap up the fiber roving of pre-soaked resin shaping by mould pressing process on FRP inhaul cable (1) surface.
2. a kind of anchoring process being applicable to large-tonnage FRP inhaul cable as claimed in claim 1, is characterized in that: fiber roving is carbon fiber, basalt fibre or fibre glass roving.
3. a kind of anchoring process being applicable to large-tonnage FRP inhaul cable as claimed in claim 1; it is characterized in that: described protection transition zone (2) is around FRP inhaul cable (1), be evenly arranged at least two-layer minor diameter FRP muscle/rope, minor diameter FRP muscle/rope from internal layer to skin according to the arrangement of gradients that length and diameter all reduce.
4. a kind of anchoring process being applicable to large-tonnage FRP inhaul cable as claimed in claim 2 or claim 3, is characterized in that: the protection thickness of transition zone and the diameter ratio of FRP inhaul cable are 0.1 ~ 0.7.
5. a kind of anchoring process being applicable to large-tonnage FRP inhaul cable as described in claim 1,2 or 3, it is characterized in that: described FRP inhaul cable (1) is the FRP inhaul cable in surface FRP inhaul cable with ribbing or light face, FRP inhaul cable is single or many, and the many parallel compositions of FRP inhaul cable or strand are twisted with the fingers and formed.
6. a kind of anchoring process being applicable to large-tonnage FRP inhaul cable according to claim 1, it is characterized in that: described strand tapered anchorage comprises load Transfer Medium (3) and metal sleeve (4), the external surface of load Transfer Medium (3) is taper, and load Transfer Medium (3) is that inner side has the metal intermediate plate of recessed tooth, solidifies the expanding material of rear volume expansion or have the material of radial rigidity change; Described metal sleeve (4) is a kind of outer for there being the structure of taper hole in cylinder, and the angle of taper hole is identical with the tapering of load Transfer Medium (3) external surface.
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| CN201310645316.1A CN103669208B (en) | 2013-12-05 | 2013-12-05 | A kind of anchoring process being applicable to large-tonnage FRP inhaul cable |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898905B (en) * | 2014-04-24 | 2016-04-27 | 四川盛唐建设工程有限公司 | Composite high-strength anchor cable |
| CN104612053B (en) * | 2015-02-11 | 2017-01-04 | 东南大学 | Possesses the FRP muscle-steel Shu Zuhe hoist cable structure of warning function |
| CN105200990B (en) * | 2015-09-29 | 2017-09-15 | 蚌埠富源电子科技有限责任公司 | A kind of tube-expanding type anchor cable |
| CN107119855B (en) * | 2017-05-27 | 2022-08-26 | 东南大学 | Structure for improving anchoring performance of composite bar and extrusion forming method thereof |
| CN108004926B (en) * | 2017-11-30 | 2019-09-20 | 东南大学 | Large-tonnage FRP inhaul cable anchoring process |
| DE102018126799B4 (en) * | 2018-10-26 | 2020-06-04 | Sbp Gmbh | Rope net facade with ropes made of fiber composite material |
| CN111945724A (en) * | 2020-08-04 | 2020-11-17 | 北京市政建设集团有限责任公司 | Anchor cable supporting structure with large-diameter reinforcement rod body and intelligent prestress application method |
| CN112095466B (en) * | 2020-09-17 | 2022-04-15 | 东南大学 | FRP inhaul cable anchoring method and anchoring end |
| KR102321188B1 (en) * | 2021-03-18 | 2021-11-04 | 주식회사 한국교량 | Friction wedge for prestressing strand and the construction method thereof |
| CN114214938B (en) * | 2021-11-23 | 2023-11-14 | 上海浦江缆索股份有限公司 | Anchoring strength improving method for carbon fiber inhaul cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2573773Y (en) * | 2002-07-19 | 2003-09-17 | 东南大学 | Prestressed FRP reinforcement sheet fastening body device |
| CN2573771Y (en) * | 2002-07-19 | 2003-09-17 | 东南大学 | Prestressed FRP reinforcement sheet fastening body device with protector |
| JP4303569B2 (en) * | 2003-11-21 | 2009-07-29 | 株式会社ピーエス三菱 | FRP tendon fixing method |
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