CN111535178A - Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof - Google Patents

Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof Download PDF

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Publication number
CN111535178A
CN111535178A CN202010334844.5A CN202010334844A CN111535178A CN 111535178 A CN111535178 A CN 111535178A CN 202010334844 A CN202010334844 A CN 202010334844A CN 111535178 A CN111535178 A CN 111535178A
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China
Prior art keywords
frp
steel
fiber
section
prestressed
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CN202010334844.5A
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Chinese (zh)
Inventor
郝建兵
吴刚
朱虹
李新建
朱蓉蓉
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China Construction First Group Corp Ltd
Third Construction Co Ltd of China Construction First Group Co Ltd
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China Construction First Group Corp Ltd
Third Construction Co Ltd of China Construction First Group Co Ltd
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Application filed by China Construction First Group Corp Ltd, Third Construction Co Ltd of China Construction First Group Co Ltd filed Critical China Construction First Group Corp Ltd
Priority to CN202010334844.5A priority Critical patent/CN111535178A/en
Publication of CN111535178A publication Critical patent/CN111535178A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/30—Metal
    • E01D2101/32—Metal prestressed
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/40—Plastics

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Ropes Or Cables (AREA)

Abstract

The invention discloses a prestressed FRP (fiber reinforced Plastic) bar capable of being used for clip anchoring and a preparation method thereof. The FRP ribs at the middle section are made of a resin matrix and a fiber reinforced composite material through a pultrusion process; the inner core of the transition area is a prestressed steel strand, and FRP fiber wires are wrapped outside the transition area; the two ends are steel strands or high-strength steel wires, so that a novel prestress FRP rib capable of being used for clamping piece anchoring is formed. The invention can be used as a prestressed tendon, anchors steel strands or high-strength steel wires at two ends during anchoring, has all the advantages of FRP tendon in mechanical property, and avoids the problem of difficult anchoring caused by low shear strength of the FRP tendon.

Description

Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof
Technical Field
The invention relates to the technical field of prestressed zippers, in particular to a prestressed FRP rib capable of being used for clamping piece anchoring and a preparation method thereof.
Background
At present, plates, bars, cables and the like are widely applied to civil engineering, and in the existing research, the idea of applying FRP materials to large-span and ultra-large-span bridges is not lacked. By utilizing the characteristics of light weight and high strength of the FRP material, the sag effect of the steel cable caused by self weight can be effectively solved, the theoretical limit span of the bridge is greatly improved, and the FRP cable is more suitable for the humid and high-chloride-ion-concentration harmful environments such as river-crossing, sea-crossing and the like.
However, because of the low shear strength of FRP materials (fiber reinforced composite materials), the anchoring thereof has been a bottleneck problem restricting the application thereof in the field of prestressed cables. The existing anchoring systems of FRP inhaul cables can be divided into two categories, namely a mechanical clamping type and a bonding type, from the anchoring force mechanism. The mechanical clamping type anchorage device is similar to a steel strand clamping type anchorage device, the clamping effect is generated by the pressure applied to the FRP rib by the clamping piece, the mechanical clamping type anchorage device has the advantages of flexible design and convenience in construction, the defect is that the clamping piece easily generates concentrated stress in the clamping process to cause the FRP rib damage, the FRP rib is subjected to shearing damage in an anchoring area, and the ideal damage mode is not required to be generated in the anchoring area. The bonding type anchorage device is characterized in that resin or other bonding materials are filled in a sleeve-like device, and shearing force is transmitted through bonding force, friction force and mechanical biting force between the bonding materials and the FRP ropes.
In the prior art, the FRP is generally wrapped on a steel strand or a steel bar in the longitudinal full length mode, the characteristics of high FRP strength, low elastic modulus, light weight and corrosion resistance are utilized to complement the characteristics of low steel strength, high elastic modulus, large weight and non-corrosion resistance, and a corrosion-resistant composite reinforcement material with high strength, high elastic modulus, medium weight and corrosion resistance is formed by a material mixing principle. Therefore, the invention aims to overcome the defects of low elastic modulus of FRP materials and corrosion resistance of steel materials. The mechanical properties of the finished product are the properties of steel and FRP material.
However, the FRP-steel composite rib inner core is made of steel, and is externally wrapped with an FRP material, and when the FRP-steel composite rib inner core is used for a prestressed structure, an anchorage device matched with the FRP material is required, so that the FRP anchoring problem cannot be solved.
Disclosure of Invention
The invention aims to provide a novel prestressed FRP rib capable of being used for clamping piece anchoring and a preparation method thereof.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the utility model provides a prestressing force FRP muscle that can be used to clip anchoring which characterized in that: comprises a middle FRP section, steel cable sections at two ends and a transition section for connecting the FRP section and the steel cable sections; the FRP section is formed by dipping FRP fiber tows in a resin matrix and heating and curing; the transition section is formed by bonding a steel cable at the end part of the steel cable section and an FRP fiber tow at the end part of the FRP section, the steel cable is positioned in the center of the FRP fiber tow, the FRP fiber tow is uniformly bonded around the steel cable along the central axis of the steel cable, and the bonding mode is heating and curing. The proportion of the steel strand and the FRP can be designed according to different use targets.
As a preferred technical solution of the present invention, in the transition section, the FRP filaments surrounding the steel cord are arranged in layers from inside to outside, and are overlapped by progressive bonding, wherein the overlapping length of the FRP filament layer of the inner layer is longer than that of the outer layer, that is, the overlapping length of the FRP filaments close to the core material is longer, and the longer the distance from the core material in the diameter direction is, the shorter the overlapping length is, so that the peeling can be effectively prevented.
Further, the fiber reinforced plastic composite material can also comprise a winding belt, wherein the winding belt is made of FRP winding wires, FRP winding bundles or FRP winding belts wound outside the transition section, or other matched materials, and the bonding mode is heating curing, so that the peeling is prevented.
The FRP fiber tows are carbon fiber, glass fiber, aramid fiber or basalt fiber material tows.
Further, the resin matrix is a thermoset and thermoplastic resin matrix.
Further, the steel cable section can be a high-strength steel wire or a high-strength steel bar.
In addition, the invention also provides a preparation method of the prestressed FRP rib for clip anchoring, which is characterized by comprising the following steps:
step one, yarn feeding: drawing the FRP (fiber reinforced plastic) strand bundle out of the yarn releasing frame;
step two, gum dipping: placing a resin matrix in a dipping tank, and fully soaking the drawn FRP raw filament bundle through the dipping tank;
step three, passing through a yarn threading plate: the fully soaked fiber protofilaments penetrate through a threading plate;
step four, molding the FRP ribs: the fiber precursor enters a forming die to be formed after passing through a yarn threading plate to form an FRP rib;
step five, heating and curing to prepare the FRP section: heating and curing the formed FRP ribs by heating equipment to form an FRP section;
step six, adding steel strands: after the middle FRP section is manufactured to reach the specified length, inserting the steel strand into the middle of the yarn threading plate, winding the FRP tows outside the steel strand, and extruding and molding the FRP tows together through a molding die;
step seven, forming the transition section: curing and molding the formed steel strand and a transition section consisting of FRP tows wound outside the steel strand together by heating equipment;
step eight, stopping feeding the FRP tows: cutting the fiber tow after the transition section reaches the designed length, and stopping feeding the FRP tow;
step nine, cutting off the steel strand: and continuously feeding the steel strand until the steel rope section reaches the specified length, and cutting the steel strand, so that the preparation of the prestressed FRP rib is completed.
Wherein the tensile ultimate bearing capacity of the FRP section reinforcement material is FFRPUltimate bearing capacity F of a steel cable sectionSteelThe ultimate tensile bearing capacity of the transition section is FTThe three satisfy FT＞FSteel＞FFRP。
The main working principle of the invention is that the FRP is transited into the steel strand at the end part through the transition region by utilizing the bonding performance between the steel strand and the FRP resin matrix, so that the problem of difficult anchoring of the FRP can be solved. The anchoring of the cable is realized by anchoring high-strength steel wires or steel strands at two ends, and the FRP section and the high-strength steel wires or steel strands are transited through a section of lap joint section. The axial tension of the cable is transmitted by the adhesive force of the overlapping segments. Through the changeover portion, excessively be steel with FRP material, replace FRP material's anchor through the anchor to steel, avoided the anchor problem to the FRP cable completely.
Compared with the prior art, the invention has the technical advantages that:
the inhaul cable has the advantages of all performance advantages of the FRP material, and only needs to anchor the steel strand material instead of the FRP in the anchoring area of the end part.
The reinforcing material can be used for materials needing anchoring at the end parts, such as prestressed bridge cables and the like.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative, not limiting of the invention, and in which:
FIG. 1 is a schematic structural view of example 1 according to the present invention;
FIG. 2 is a schematic structural view of example 2 according to the present invention;
fig. 3 is a schematic structural diagram of embodiment 3 according to the present invention.
Reference numerals: 1-FRP section, 2-steel cable section, 3-transition section and 4-winding belt.
Detailed Description
Hereinafter, embodiments of the prestressed FRP reinforcement useful for clip anchoring and the method for manufacturing the same according to the present invention will be described with reference to the accompanying drawings. The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. Fig. 1 is a schematic structural diagram of embodiment 1 according to the present invention, and a prestressed FRP bar for clip anchoring includes a middle FRP segment 1, two steel cable segments 2 at two ends, and a transition segment 3 connecting the FRP segment 1 and the steel cable segments 2; the FRP section 1 is formed by dipping FRP fiber tows 4 in a resin matrix and heating and curing; the transition section 3 is formed by bonding the steel cable at the end part of the steel cable section 2 and the FRP fiber tows at the end part of the FRP section 1, the steel cable is positioned in the center of the FRP fiber tows, the FRP fiber tows are uniformly bonded around the steel cable along the central axis of the steel cable and longitudinally wrapped along the steel strand, and the bonding mode is heating and curing. The proportion of the steel strand and the FRP can be designed according to different use targets. The FRP fiber tows are carbon fiber, glass fiber, aramid fiber or basalt fiber material tows. The resin matrix is a thermoset and thermoplastic resin matrix. The steel cable section 2 is a high-strength steel wire or a high-strength steel bar.
Referring to fig. 2, which is a schematic structural diagram of an embodiment 2 according to the present invention, in the transition section 3 of this embodiment, FRP filaments surrounding a steel rope are arranged in layers from inside to outside, and a progressive adhesive bonding is adopted, wherein the bonding length of the FRP filament layer of the inner layer is longer than that of the outer layer. That is, the FRP close to the core material is longer in the overlapping length, and the longer the FRP is from the core material in the diameter direction, the shorter the overlapping length is, and peeling is prevented.
Fig. 3 is a schematic structural diagram of example 3 according to the present invention, which includes a wrapping tape 4 in addition to all the structures of example 1, wherein the wrapping tape 4 is an FRP wrapping filament, an FRP wrapping bundle or an FRP wrapping tape wrapped outside the transition section 3, or other suitable materials, and the bonding manner is heat curing.
The proportion of the steel strand and the FRP is designed by tensile strength, so that the tensile ultimate bearing capacity F of the FRP section 1 rib materialFRPBelow the limit bearing force F of the cable section 2SteelSuch as equation (1) so that damage does not occur in the strand area.
FFRP＜FSteel(1)
The length of the transition section should be designed by the bonding strength so that the bonding strength is higher than the strength of the steel cord section 2 and the FRP section 1, as in equation (2), so that the damage does not occur in the transition area.
FT＞FSteel＞FFRP(2)
The FRP rib can be manufactured by the following method, and the middle FRP section 1 can adopt a common FRP rib manufacturing process, namely yarn feeding, gum dipping, molding and heating and curing. The method comprises the following specific steps: drawing the FRP raw filament bundle out of a yarn releasing frame; placing a resin matrix in a dipping tank, and fully soaking the drawn FRP raw filament bundle through the dipping tank; thirdly, the fully soaked fiber protofilaments penetrate through a threading plate; fourthly, the fiber protofilaments enter a forming die to be formed after passing through a yarn threading plate; heating and curing the formed FRP rib by heating equipment to form an FRP section 1; sixthly, inserting the steel strand into the middle part of the yarn threading plate after the middle FRP section 1 is manufactured to reach the specified length, winding the FRP tows outside the steel strand, and extruding and molding the FRP tows together through a molding die; seventhly, curing and molding the formed steel strand and a transition section consisting of FRP (fiber reinforced plastic) tows wound outside the steel strand together by heating equipment; cutting off the fiber tow when the transition section 3 reaches the designed length, and stopping feeding the FRP tow; and ninthly, continuously feeding the steel strand until the steel strand is cut off after the steel strand is of the specified length.
And (3) simultaneously feeding the steel strand and the FRP fiber tows subjected to gum dipping into a forming die at the transition section 3, and combining the steel strand at the center of the transition section and the surrounding FRP fiber yarns into a whole through pultrusion and heating curing. And when the length of the transition section is met, the FRP fiber yarns are stopped being fed into the die, the steel strands are continuously fed to reach a certain length, and finally, a winding belt 4 can be additionally arranged on the outermost side.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The utility model provides a prestressing force FRP muscle that can be used to clip anchoring which characterized in that: comprises a middle FRP section (1), steel cable sections (2) at two ends and a transition section (3) for connecting the FRP section (1) and the steel cable sections (2); the FRP section (1) is formed by dipping FRP fiber tows in a resin matrix and heating and curing; the transition section (3) is formed by bonding a steel cable at the end part of the steel cable section (2) and an FRP fiber tow at the end part of the FRP section (1), the steel cable is positioned at the center of the FRP fiber tow, the FRP fiber tow is uniformly bonded around the steel cable along the central axis of the steel cable, and the bonding mode is heating and curing.
2. The prestressed FRP rib for clip anchoring as claimed in claim 1, wherein: in the transition section (3), the FRP fiber yarns surrounding the steel cable are arranged in a layered mode from inside to outside, progressive bonding overlapping is adopted, and the overlapping length of the FRP fiber yarn layer of the inner layer is longer than that of the outer layer.
3. The prestressed FRP rib for clip anchoring as claimed in claim 1, wherein: the fiber reinforced plastic composite material is characterized by further comprising a winding belt (4), wherein the winding belt (4) is an FRP winding wire, an FRP winding bundle or an FRP winding belt which is wound on the outer side of the transition section (3), and the bonding mode is heating and curing.
4. The prestressed FRP rib for clip anchoring as claimed in claim 1, wherein: the FRP fiber tows are carbon fiber, glass fiber, aramid fiber or basalt fiber material tows.
5. The prestressed FRP rib for clip anchoring as claimed in claim 1, wherein: the resin matrix is a thermoset and thermoplastic resin matrix.
6. The prestressed FRP rib for clip anchoring as claimed in claim 1, wherein: the steel cable section (2) is a high-strength steel wire or a high-strength steel bar.
7. A method for preparing the prestressed FRP rib for clip anchoring according to any one of claims 1 to 6, which comprises the following steps:
step one, yarn feeding: drawing the FRP (fiber reinforced plastic) strand bundle out of the yarn releasing frame;
step two, gum dipping: placing a resin matrix in a dipping tank, and fully soaking the drawn FRP raw filament bundle through the dipping tank;
step three, passing through a yarn threading plate: the fully soaked fiber protofilaments penetrate through a threading plate;
step four, molding the FRP ribs: the fiber precursor enters a forming die to be formed after passing through a yarn threading plate to form an FRP rib;
step five, heating and curing: heating and curing the formed FRP ribs by heating equipment to form an FRP section;
step six, adding steel strands: after the middle FRP section is manufactured to reach the specified length, inserting the steel strand into the middle of the yarn threading plate, winding the FRP tows outside the steel strand, and extruding and molding the FRP tows together through a molding die;
step seven, forming the transition section (3): curing and molding the formed steel strand and a transition section consisting of FRP tows wound outside the steel strand together by heating equipment;
step eight, stopping feeding the FRP tows: cutting the fiber tow after the transition section (3) reaches the designed length, and stopping feeding the FRP tow;
step nine, cutting off the steel strand: and continuously feeding the steel strand until the steel rope section reaches the specified length, and cutting the steel strand, so that the preparation of the prestressed FRP rib is completed.
8. The method for preparing the prestressed FRP rib for clip anchoring according to claim 7, wherein the prestressed FRP rib comprises the following steps: the tensile ultimate bearing capacity of the FRP section reinforcement material is FFRPUltimate bearing capacity F of a steel cable section (2)SteelThe ultimate tensile bearing capacity of the transition section is FTThe three satisfy FT＞FSteel＞FFRP。
CN202010334844.5A 2020-04-24 2020-04-24 Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof Pending CN111535178A (en)

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CN202010334844.5A CN111535178A (en) 2020-04-24 2020-04-24 Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof

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Application Number Priority Date Filing Date Title
CN202010334844.5A CN111535178A (en) 2020-04-24 2020-04-24 Prestressed FRP (fiber reinforced Plastic) rib capable of being used for clamping piece anchoring and preparation method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113481984A (en) * 2021-07-21 2021-10-08 洛阳理工学院 Large-tonnage basalt fiber anchor cable and manufacturing method thereof
CN114214856A (en) * 2021-11-01 2022-03-22 江阴法尔胜住电新材料有限公司 Method for manufacturing composite steel strand

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113481984A (en) * 2021-07-21 2021-10-08 洛阳理工学院 Large-tonnage basalt fiber anchor cable and manufacturing method thereof
CN114214856A (en) * 2021-11-01 2022-03-22 江阴法尔胜住电新材料有限公司 Method for manufacturing composite steel strand

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