CN103669208A - Anchoring method applicable to large-tonnage FRP inhaul cable - Google Patents
Anchoring method applicable to large-tonnage FRP inhaul cable Download PDFInfo
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- CN103669208A CN103669208A CN201310645316.1A CN201310645316A CN103669208A CN 103669208 A CN103669208 A CN 103669208A CN 201310645316 A CN201310645316 A CN 201310645316A CN 103669208 A CN103669208 A CN 103669208A
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Abstract
The invention discloses an anchoring method applicable to a large-tonnage (larger than 50 tones) FRP inhaul cable. The FRP inhaul cable is anchored with a clamping piece type anchorage device, a protection transition layer with the length no smaller than the length of an anchoring area of the clamping piece type anchorage device is formed at the anchoring end of the FRP inhaul cable, the protection transition layer and the FRP inhaul cable are integrated, and the clamping piece type anchorage device is anchored to the protection transition layer. After the FRP inhaul cable and the protecting layer are pressed into a whole, while the shearing strength of the FRP inhaul cable and a protecting layer interface is increased, the phenomenon that the FRP inhaul cable weak in transverse strength makes direct contact with load transmitting mediums large in rigidity in the anchoring area can be avoided, a stressed buffering layer is formed, and the FRP inhaul cable can be indirectly protected. The anchoring method used for anchoring the FRP inhaul cable has the advantages of facilitating construction and being high in anchoring efficiency and the like, long-term performance of an anchoring system can be guaranteed, the method can also be used for tensile tests on the FRP inhaul cable, samples can be prepared easily and conveniently, and compared with an adhesive type anchoring method, test errors caused by overlarge shearing deformation of resin can be avoided.
Description
Technical field
The present invention relates to the anchoring field of the infrastructure architecture drag-lines such as civil engineering, traffic, energy environment, relate in particular to the anchor-hold technology that adopts fibre reinforced composites to prepare.
Background technology
The advantages such as that fibre reinforced composites (Fiber Reinforced Polymer, be called for short FRP) have is high-strength, light weight, corrosion-resistant and endurance.FRP drag-line is by silvalin impregnating resin by a certain percentage, by the composite material of pultrude process moulding, 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 drag-line has wide prospect for field of civil engineering, the anchoring system of practical engineering need perfect, and especially, for major diameter large-tonnage FRP drag-line, safe and reliable anchoring system is also not full-fledged.Existing FRP dragline anchorage is mainly divided into two kinds of bonded and clip types.
Bond type anchorage depends on the ability of binding material (being generally resin) opposing shear strain, the advantage of this anchoring process is that binding material is to FRP drag-line body not damaged, the tension test of standard FRP muscle/rope material generally just adopts this method, and specific practice is that perfusion resin waits for that resin solidification can make test specimen in straight sleeve.This anchoring process has that process for filling colloid is complicated, the resin solidification time is long and the modulus of elasticity of deficiency, the especially resin such as long-term behaviour is poor is minimum will cause self shear strain excessive, will introduce in test the error of can not ignore, and affects result of the test.
Strand tapered anchorage is common in the anchoring of prestress wire, and the wedge shape extruding force producing by tapered steel intermediate plate and steel anchor cup clamps steel strand, has easy construction, anchoring efficiency advantages of higher.But the FRP drag-line of Mechanical Property Anisotropy compressive strength and shear strength is in the horizontal lower, only has 1/10-1/20 of longitudinal tensile strength, steel clamp sheet and FRP drag-line can cause FRP drag-line radial surface compressive stress and shear stress concentration because of rigidity sudden change, radial compressive stress is crossed conference and is caused that FRP drag-line produces local squeeze and destroy in anchorage zone, i.e. " notch effect ", before the tensile strength that not yet reaches capacity, FRP drag-line just produces disrumpent feelings at load-bearing top, anchorage zone.FRP drag-line 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 causing all will to cause the inefficacy in advance of FRP drag-line clip type anchoring system, have greatly reduced the anchoring efficiency of ground tackle.
Existing anchoring process for single minor diameter FRP muscle material, is applicable to little span structure mostly, so the anchoring of major diameter FRP drag-line is the bottleneck problem of its extensive use in Important Project of restriction.For the advantage of better performance FRP drag-line in middle large-span structure, certainly will need to develop many, large-tonnage, large diameter FRP anchor-hold system.
Summary of the invention
Goal of the invention: can only anchoring minor diameter FRP drag-line for bonded anchoring process, FRP drag-line and steel clamp sheet in clip type anchoring process are because rigidity sudden change there will be the concentrated problem of stress, need a kind of easy construction, anchoring efficiency can be improved, the ground tackle method of the FRP drag-line of anchoring system long-term behaviour can be guaranteed again.
Technical scheme: for solving the problems of the technologies described above, the present invention for the anchoring process of FRP drag-line is:
A kind of anchoring process that is applicable to 50 tons of above large-tonnage FRP drag-lines; adopt strand tapered anchorage to carry out anchoring to FRP drag-line; it is characterized in that: the anchored end of described FRP drag-line be formed with a length be not less than described strand tapered anchorage anchorage zone length, with FRP drag-line all-in-one-piece protection transition zone, and strand tapered anchorage is anchored on protection transition zone.FRP drag-line and topping are molded into after integral body; when increasing the shear strength at FRP drag-line and topping interface; the direct load Transfer Medium very large with rigidity contacts in anchorage zone can to avoid the weak FRP drag-line of transverse strength; form a stressed cushion coat, play the effect of indirect protection FRP drag-line.
Described protection transition zone is longitudinally or with the fiber roving longitudinally with an angle parcel pre-soaked resin to pass through mould pressing process moulding on FRP drag-line surface, and fiber roving is carbon fiber, basalt fibre or fibre glass roving.
Described protection transition zone is to be evenly arranged at least two-layer minor diameter FRP muscle/rope, the arrangement of gradients that minor diameter FRP muscle/rope all reduces according to length and diameter from internal layer to skin around at FRP drag-line.When the FRP of anchoring drag-line diameter 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 drag-line are 0.1～0.7.
Described FRP drag-line is surface FRP drag-line with ribbing or the FRP drag-line of light face, and FRP drag-line is single or many, and many parallel compositions of FRP drag-line or strand are twisted with the fingers and formed.
Described strand tapered anchorage comprises load Transfer Medium and metal sleeve, and the external surface of year Transfer Medium is taper, and load Transfer Medium is that inner side has the metal intermediate plate intermediate plate of recessed tooth, solidify the expanding material of rear volume expansion or have the material that radial rigidity changes; 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, can select inner side to have the steel clamp sheet of recessed tooth, also can select the expanding material of volume expansion after solidifying, and can also select and have the material that radial rigidity changes.Steel clamp sheet inner side has recessed tooth, and recessed tooth can produce mechanical snap power with the protection transition zone of compression molding, thereby increases anchored force, guarantees FRP drag-line and protection transition zone and steel clamp sheet co-operation after mold pressing; Expanding material expands after solidifying between sleeve pipe and FRP drag-line, and internal surface of sleeve pipe is produced to great interface normal pressure, thereby the frictional force increasing on FRP drag-line-expanding material and two interfaces of expanding material-sleeve pipe realizes anchoring; There is the peak stress that material that radial rigidity changes can reduce load-bearing top, anchorage zone effectively, be conducive to stressed in anchorage zone of anisotropy FRP drag-line, can many major diameter FRP drag-lines of anchoring.The internal taper hole angle of steel bushing is identical with the tapering that load transmits material, and steel bushing can transmit material with load closely to be agreed with, and relies on wedge shape anchor mechanism to produce extruding anchored force fully.
Beneficial effect: the present invention is for the anchoring process of large-tonnage FRP drag-line, utilize the mechanism of clip type anchoring system tapered squeezing anchoring, dependence provides anchored force with the steel bushing of inner cone and the wedge shape extruding force of taper load Transfer Medium generation, can guarantee the effective clamping to FRP drag-line.Anchoring process advantage for large-tonnage FRP drag-line of the present invention is outstanding:
First; the present invention can effectively avoid traditional strand tapered anchorage because the sudden change of FRP material and steel clamp sheet rigidity causes the local squeeze and destroy of FRP drag-line; i.e. " notch effect "; introduce with the pre-latex bonded fibre rove protection of FRP drag-line material homology peripheral at drag-line; as stressed cushion coat; the FRP drag-line that indirect protection transverse strength is weak, have good with FRP drag-line interfacial bond property, increase the advantages such as stress transmission.Take can effectively improve FRP anchor-hold efficiency after above-mentioned measure, especially when anchoring tonnage reaches more than 50 tons, can effectively reduce the notch effect at load-bearing top, anchorage zone, give full play to the high strength of FRP drag-line, guarantee the long-term behaviour of anchoring system;
Secondly; the smooth surface of light face FRP drag-line; interface friction force deficiency causes traditional anchoring process when anchoring, very easily to produce stripped thread phenomenon; in the present invention, the topping of compression molding and inner side have the steel clamp sheet of recessed tooth on interface, to produce mechanical snap power, and don't can itself cause damage to FRP drag-line.So the present invention can effectively solve the anchoring bottleneck of light face FRP drag-line;
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 drag-line and topping form integral body; can directly be clamped on the fixture of testing machine the standard test for tensile strength for FRP muscle/rope; sample is prepared convenient and time-saving, compares can avoid because of the excessive testing error of bringing of resin shear strain 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 anchor-hold 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 drag-line radial surface compressive stress in anchorage zone.
Figure 10 is the distribution curve of FRP drag-line 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 FRP muscle/rope test for tensile strength schematic diagram of embodiments of the invention five.
Figure 14 is the structural representation of FRP drag-line.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
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 dragline ground tackle 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.The load Transfer Medium 300 that the present embodiment is used is steel clamp sheet 3, comprises topping 2, tapered steel intermediate plate 3 and the steel bushing 4 of FRP drag-line 1, compression molding.First on FRP drag-line surface, be wound around the fiber roving 6 of pre-soaked resin 5; according to the different winding number of plies of different choice of anchoring FRP drag-line diameter; pass through mould pressing process; FRP drag-line 1 and protection transition zone 2 are molded into after integral body; FRP drag-line 1 has high shear strength with protection transition zone 2 interfaces, can avoid the weak FRP drag-line 1 of transverse strength directly to contact with cone-shaped clip 3 in anchorage zone, forms a stressed cushion coat; avoid notch effect, play the effect of indirect protection FRP drag-line.Again by being divided into two, inner side has protection transition zone 2 surfaces 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, thereby 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, can closely agree with cone-shaped clip 3, rely on wedge shape anchor mechanism to produce extruding anchorage effect fully, steel bushing is provided with external screw thread, by external screw thread, can be connected 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 on FRP drag-line surface, be wound around the fiber roving of pre-soaked resin; according to the different winding number of plies of different choice of anchoring FRP drag-line diameter; by mould pressing process moulding; FRP drag-line 1 and topping 2 are molded into after integral body; FRP drag-line 1 has high shear strength with protection transition zone 2 interfaces, forms a stressed cushion coat indirect protection FRP drag-line.Between the FRP drag-line 1 of band protection transition zone 2 after steel anchor cup 4 and mold pressing, pour into expanding material 5 again, rely on the interface normal pressure producing after expanding material 5 setting expansions that anchored force is provided, form a FRP anchor-hold system.
Embodiment 3: refer to shown in Fig. 7.Its basic structure is with embodiment 1, and institute's difference is the material 6 that described load Transfer Medium 3 changes for having radial rigidity.Fig. 8, Fig. 9, Figure 10 are the distribution curve of FRP drag-line radial surface compressive stress and shear stress, solid line does not transmit materials A for carrying out the load of mechanical property design, dotted line is to transmit material B according to the load of anchorage zone stress distribution design, carry out anchoring system after mechanical property design and can effectively reduce the peak stress at load-bearing top, anchorage zone, be conducive to stressed in anchorage zone of anisotropy FRP drag-line, can many FRP drag-lines of anchoring.
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 for the minor diameter FRP drag-line 7 of arrangement of gradients around FRP drag-line 1.Between steel anchor cup 4 and FRP drag-line 1, pour into expanding material 5 again, rely on interface normal pressure that anchored force is provided after waiting expanding material 5 setting expansions, form a FRP anchor-hold 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 on FRP muscle/rope 1 surface, be longitudinally wound around the fiber roving of pre-soaked resin with hoop; by mould pressing process moulding; FRP muscle/rope 1 and protection transition zone 2 are molded into integral body; can increase FRP muscle/rope 1 and the shear strength of protecting transition zone 2 interfaces; 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 be carried out test for tensile strength.
The present invention is directed to FRP drag-line transversely compressive strength and the weak problem of shear strength, avoid FRP anchor-hold system in anchorage zone, to occur that stress is concentrated, a kind of construction anchoring process is simply and easily provided, improves anchoring efficiency, guarantee the long-term behaviour of anchoring system.Adopt die press technology for forming by FRP drag-line and be wrapped in its surperficial pre-soaked resin fiber roving and be pressed into integral body, can be used as cushion coat and effectively slow down radial compressive stress and the shear stress peak value of load-bearing top, anchorage zone cone-shaped clip to FRP drag-line surface, be conducive to stressed in anchorage zone of anisotropy FRP drag-line.The present invention can solve strand tapered anchorage FRP is damaged to large problem, solve again the anchoring bottleneck of light face FRP drag-line simultaneously, more can be for FRP drag-line test for tensile strength, sample is prepared convenient and time-saving, compares can avoid because of the excessive testing error of bringing of resin shear strain with bonded anchoring process.
Claims (6)
1. an anchoring process that is applicable to large-tonnage FRP drag-line; adopt strand tapered anchorage to carry out anchoring to FRP drag-line (1); it is characterized in that: the anchored end of described FRP drag-line be formed with a length be not less than described strand tapered anchorage anchorage zone length, with FRP drag-line all-in-one-piece protection transition zone (2), and strand tapered anchorage is anchored on protection transition zone.
2. a kind of anchoring process that is applicable to large-tonnage FRP drag-line as claimed in claim 1; it is characterized in that: described protection transition zone (2) is longitudinally or with the fiber roving longitudinally with an angle parcel pre-soaked resin to pass through mould pressing process moulding on FRP drag-line (1) surface, and fiber roving is carbon fiber, basalt fibre or fibre glass roving.
3. a kind of anchoring process that is applicable to large-tonnage FRP drag-line as claimed in claim 1; it is characterized in that: described protection transition zone (2) is to be evenly arranged at least two-layer minor diameter FRP muscle/rope, the arrangement of gradients that minor diameter FRP muscle/rope all reduces according to length and diameter from internal layer to skin around at FRP drag-line (1).
4. a kind of anchoring process that is applicable to large-tonnage FRP drag-line as claimed in claim 2 or claim 3, is characterized in that: the protection thickness of transition zone and the diameter ratio of FRP drag-line are 0.1～0.7.
5. a kind of anchoring process that is applicable to large-tonnage FRP drag-line as described in claim 1,2 or 3, it is characterized in that: described FRP drag-line (1) is surface FRP drag-line with ribbing or the FRP drag-line of light face, FRP drag-line is single or many, and many parallel compositions of FRP drag-line or strand are twisted with the fingers and formed.
6. a kind of anchoring process that is applicable to large-tonnage FRP drag-line as claimed in claim 1, it is characterized in that: described strand tapered anchorage comprises load Transfer Medium (3) and metal sleeve (4), the external surface that carries Transfer Medium (3) is taper, and load Transfer Medium (3) is that inner side has the metal intermediate plate intermediate plate of recessed tooth, the expanding material of volume expansion or have the material that radial rigidity changes after solidifying; 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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Cited By (10)
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| CN103898905A (en) * | 2014-04-24 | 2014-07-02 | 四川盛唐建设工程有限公司 | Composite high-strength anchor cable |
| CN104612053A (en) * | 2015-02-11 | 2015-05-13 | 东南大学 | FRP (fiber reinforced plastic) tendon-bundle hybrid sling structure with warning function |
| CN105200990A (en) * | 2015-09-29 | 2015-12-30 | 赵明 | Expansion tube anchor cable |
| CN107119855A (en) * | 2017-05-27 | 2017-09-01 | 东南大学 | Improve the structure and its extrusion process of multiple material muscle anchoring property |
| CN108004926A (en) * | 2017-11-30 | 2018-05-08 | 东南大学 | Large-tonnage FRP inhaul cable anchoring process |
| 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 |
| CN112095466A (en) * | 2020-09-17 | 2020-12-18 | 东南大学 | FRP inhaul cable anchoring method and anchoring end |
| CN113195843A (en) * | 2018-10-26 | 2021-07-30 | 德国施莱希工程设计公司 | Rope net vertical face with fiber composite rope |
| CN114214938A (en) * | 2021-11-23 | 2022-03-22 | 上海浦江缆索股份有限公司 | Anchoring strength improving method of carbon fiber inhaul cable |
| CN114319105A (en) * | 2021-03-18 | 2022-04-12 | 株式会社韩国桥梁 | Friction type clamping piece and construction method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103898905A (en) * | 2014-04-24 | 2014-07-02 | 四川盛唐建设工程有限公司 | Composite high-strength anchor cable |
| CN104612053A (en) * | 2015-02-11 | 2015-05-13 | 东南大学 | FRP (fiber reinforced plastic) tendon-bundle hybrid sling structure with warning function |
| 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 |
| CN105200990A (en) * | 2015-09-29 | 2015-12-30 | 赵明 | Expansion tube anchor cable |
| CN107119855A (en) * | 2017-05-27 | 2017-09-01 | 东南大学 | Improve the structure and its extrusion process of multiple material muscle anchoring property |
| CN108004926B (en) * | 2017-11-30 | 2019-09-20 | 东南大学 | Large-tonnage FRP inhaul cable anchoring process |
| CN108004926A (en) * | 2017-11-30 | 2018-05-08 | 东南大学 | Large-tonnage FRP inhaul cable anchoring process |
| CN113195843A (en) * | 2018-10-26 | 2021-07-30 | 德国施莱希工程设计公司 | Rope net vertical face with fiber composite rope |
| 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 |
| CN112095466A (en) * | 2020-09-17 | 2020-12-18 | 东南大学 | FRP inhaul cable anchoring method and anchoring end |
| CN114319105A (en) * | 2021-03-18 | 2022-04-12 | 株式会社韩国桥梁 | Friction type clamping piece and construction method thereof |
| CN114319105B (en) * | 2021-03-18 | 2024-02-23 | 株式会社韩国桥梁 | Friction type clamping piece and construction method thereof |
| CN114214938A (en) * | 2021-11-23 | 2022-03-22 | 上海浦江缆索股份有限公司 | Anchoring strength improving method of carbon fiber inhaul cable |
| 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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