CN109881577A - A kind of steel and CFRP combined stress band and preparation method thereof - Google Patents
A kind of steel and CFRP combined stress band and preparation method thereof Download PDFInfo
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- CN109881577A CN109881577A CN201910242412.9A CN201910242412A CN109881577A CN 109881577 A CN109881577 A CN 109881577A CN 201910242412 A CN201910242412 A CN 201910242412A CN 109881577 A CN109881577 A CN 109881577A
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Abstract
The invention discloses a kind of steel and CFRP combined stress band and preparation method thereof, belong to science of bridge building field.The combined stress band is the stress zone collectively formed by being located at the steel band of structural core with the CFRP sheath for being wrapped in outside.The stress zone is used to be made in continuous, the unidirectional CFRP pultrusion of steel strip surface progress, steel band is first arranged in middle position, again the raw material of CFRP by impregnation, it is preforming, heating extrusion forming, cooling and solidifying and etc. tight is made in the sheath of steel strip surface, fixed length cutting is finally carried out, so that achieving the purpose that can continuous production random length steel and CFRP combined stress band.The present invention is to utilize the advantage of steel and CFRP respectively, overcome the shortcomings of homogenous material, make all lightweights of the existing CFRP of stress zone, high-strength, corrosion-resistant, antifatigue advantage, the traditional steel stress zone of effective solution is perishable, fatiguability, from the problems such as great, load-carrying efficiency is not high, improve the durability and economy of stress zone.
Description
Technical field
The invention belongs to technical field of bridge engineering, and in particular to a kind of combined to steel with CFRP stress band structure and its
Production method.
Background technique
Stress zone bridge is and elongated and flexibility characteristics are in one of the bridge structure of one, simple structure, materials economy, bridge
Type is beautiful, is a kind of very with the structure type of development prospect.Currently, in the world built stress zone bridge mainly use it is high-strength
Steel make stress zone.These stress zone bridges usually form receiving as stress zone and concrete structure by steel band or cable wire
The floorings of load are finally being anchored between two abutments in the form of catenary or second-degree parabola under Gravitative Loads.It answers
Power band bridge is just like a ribbon is suspended on bridge floor both ends, through being applied to down town or mountain valley area frequently as landscape bridge, together
When since it can will be preferably minimized the influence of environment in work progress, to avoid in the construction in riverbed waters so right
Environment has the area of particular/special requirement, and stress band structure can be used as the preferred forms of bridge.
Stress zone bridge belongs to one kind of cableway platform system, and stress zone is typically located on the outside of beam body, and is in
High-stress state, it is more sensitive to the extraneous infringement such as corrosion.The problem of bridge steel stress zone durability deficiency is more and more at this stage
Significantly, and the state of stress zone directly influences the service performance and service life of stress zone bridge.
The problems such as to solve steel stress zone easy-to-rust, fatiguability, improve its durability, the research and application of composite material by
The attention of numerous scholars is arrived.Carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer, abbreviation CFRP)
It is, using resin as basis material, to be formed by one by drawing molding and necessary surface treatment using carbon fiber as reinforcing material
Kind advanced composite material (ACM).CFRP has along fiber is high, corrosion-resistant to tensile strength, density is small, durability is good, anti-fatigue performance is excellent
CFRP is applied to bridge structure, its tension and corrosion resistance can be given full play to, especially in severe by the advantages that good
Steel stress zone is perishable under environment, greatly improves the durability of structure.Further, since CFRP material high-strength light, it can also be big
Width mitigates the self weight of bridge, improves load-carrying efficiency, and then increase the limitation span of bridge structure.But CFRP also has corresponding spy
Point, since its material property is orthotropy, axial tensile-strength is higher, can reach 2000MPa or more, but laterally
Resistance to compression and shearing strength it is then relatively low, therefore the anchoring of CFRP material is always a problem.
To meet bridge structure lightweight, high-strength, corrosion resistant requirement, at the same make structure become more merrily and lightheartedly with beauty, this
Text proposes a kind of stress band structure and preparation method thereof that steel is combined with CFRP.
Summary of the invention
The purpose of the present invention is for solve current stress zone bridge durability, load-bearing property, rigidity mutually restricts cannot be simultaneously
The problem of meeting, proposes a kind of stress zone structure type that steel is combined with CFRP, can sufficiently solve the ductility of CFRP not
The problems such as corrosion susceptibility of foot and steel band.
Traditional steel stress zone easy-to-rust, durability are insufficient.The present invention provides a kind of steel and CFRP combined stress band, outer layer
For CFRP sheath, core is steel band.Since the constitutive relation of CFRP is linearly distributed, destructive process is not surrendered, and steel have
There is apparent yielding stage, composite structure can significantly improve the ductility of CFRP.In addition, making by adjusting carbon fiber content
The elasticity modulus of CFRP sheath is identical as steel band, and CFRP sheath and steel band cooperate.And CFRP sheath corrosion resistance is strong,
Good protection can be provided for steel band, greatly improve the durability and economy of stress zone.
The principle of the present invention is mechanical characteristic and constitutive relation based on CFRP and steel, and a kind of steel is combined with CFRP answers
The forming process of power band is:
In steel and CFRP combined stress band, core steel band (1) is entered into mould with external CFRP (6) is wrapped in together
Tool, through Overheating Treatment preforming process, is allowed to preforming in pre-forming device.Steel band (1), carbon fiber raw yarn after preforming
(4), CFRP (6), surfacing (7) and matrix form in heating press-molding apparatus (11), are equipped with and are used in molding die
Determine the positioning device of steel band (1) position in CFRP.By the way of air-cooled to pull out heating press-molding apparatus (11)
Combined stress band solidified, finally carry out fixed length cutting with cutting equipment (13).
In entire manufacturing process, by adjusting the tension to CFRP and steel band, make the two always in tensioning state.Due to
The limiting strain of CFRP is 3% or so, and the elastic strain of steel is 1% or so, limiting strain about 7%, therefore the combined stress
Band start bear tension until destruction until constitutive relation can undergo following three phases: before strain reaches 1%, steel
The elasticity modulus of band and CFRP shared load, the stress zone is between steel band and CFRP, this stage is known as elastic rank
Section；With the increase of stress, before reaching the limiting strain of CFRP, since steel band has been surrendered at this time, the stress zone
Elasticity modulus can decrease, to show the characteristic of similar yield, the stage do not have CFRP generate destroy and steel band with
CFRP shared load, therefore the process is security process, while CYCLIC LOADING not will cause the reduction of overall mechanical properties；
If continuing to load, once strain is more than the limiting strain of CFRP, CFRP starts to be broken, and exits work therewith, load is again
It is distributed on steel band, finally with steel band reaches surrender and terminates.
Since the molding proportion of the stress zone is a compound process, the mechanical property of the combined stress band is can
With design, by adjusting the match ratio of steel and CFRP, the elasticity modulus that both can make reach unanimity substantially to jointly by
Power.The method overcomes the characteristics of poor simple CFRP ductility and higher cost, while inheriting CFRP material high-strength light, resistance to
The good advantage of long property, is a kind of advanced design concept.
Detailed description of the invention
Fig. 1 is steel and CFRP combined stress band schematic diagram.
Fig. 2 is steel and CFRP combined stress band transverse direction schematic cross-sectional view.
Fig. 3 is steel and CFRP combined stress band pultrusion production process schematic diagram.
In figure: 1-steel band；2-CFRP sheaths；3-guide rods；4-carbon fiber raw yarn tubes；5-tail portions are preforming to be set
It is standby；6-CFRP；7-surfacing tubes；8-middle part pre-forming devices；9-front pre-forming devices；10-leaching rouge slots；
11-heating press-molding apparatus；12-pulling equipments；13-cutting equipments.
Specific embodiment
More detailed description is done to the present invention with reference to the accompanying drawing:
Steel band (1): being sent into pultrusion equipment by step 1 first, the processing of the row's of progress yarn.Using rotary core shaft, by carbon
Fiber raw yarn is drawn from carbon fiber raw yarn tube (4) outer wall, can be distorted to be conducive to carbon fiber in this way to avoid raw yarn
Neat arrangement.
Step 2: all carbon fibers in raw yarn and fibrofelt are pre-processed using straight trough infusion process.This process is all
It is carried out when they are by soaking rouge slot, in entire dipping process, it is necessary to assure carbon fiber and felt arrangement are very neatly arranged.
Step 3: the CFRP of impregnation matrix sequentially passes through tail portion (5), middle part (8) and front pre-forming device (9), with even
Continuous mode is transmitted, to ensure the relative position of it and steel band, until move closer to the final shape of product, and be discharged it is extra
Resin bubble is formed subsequently into heating press-molding apparatus (11).
Step 4: after profile is pulled out heating press-molding apparatus (11), due to molding equipment (11) and pulling equipment
(12) there is certain distance between, therefore the cooling profile by the way of air-cooled.
Step 5: dragger (12) affects the steel after cooling and solidifying to move with CFRP combined stress band, the size of tractive force
Generally use 50~100kN.Hauling speed uses stepless time adjustment, depending on the requirement of the technique of stress zone, generally 0.1~
0.3m/min, according to rapid curing formula, hauling speed can be greatly improved.
Step 6: when stress strip length reaches requirement, cutting equipment (13) starts to start work, first uses stress zone
Rubber clamp clamps, and then alloy cutter starts to cut, and so far, a kind of stress band structure that steel is combined with CFRP is formally formed.
Claims (5)
1. the stress band structure that a kind of steel is combined with CFRP, it is characterised in that: steel band (1) and external packet including stress zone core
The CFRP sheath (2) wrapped up in, the CFRP sheath (2) are unidirectional, continuous carbon fiber reinforced polymer, including carbon fiber and carbon fiber
Impregnated matrix is tieed up, the direction of carbon fiber is longitudinal direction, and matrix is epoxy resin or vinyl ester resin.
2. the stress band structure that a kind of steel according to claim 1 is combined with CFRP, it is characterised in that: the stress band structure
It is produced and processed using pultrusion molding process, steel band (1) is passed through into tail with the raw yarn for being located at carbon fiber raw yarn tube (4) simultaneously
Portion's pre-forming device (5), and in the middle pretreatment for carrying out temperature and humidity of tail portion pre-forming device (5), pass through and soaks rouge slot (10)
CFRP (6) after infusing matrix resin passes through middle part pre-forming device (8) with by pretreated profile at this time jointly, finally
It is sent with surfacing (7) in the pre-forming device (9) for being located at front end；Steel band (1), carbon fiber raw yarn (4) after preforming,
CFRP (6) and surfacing (7) are then consolidated by the way of air-cooled in heating press-molding apparatus (11) interior final molding
Change, entire manufacturing process realizes the production and processing of the combined stress band under the action of reciprocating pulling equipment (12), finally when
When article end reaches control extension position, triggering infrared controller switch, cutting equipment (13) is started to work.
3. the stress band structure that a kind of steel according to claim 2 is combined with CFRP, it is characterised in that: by adjusting carbon fiber
Tie up raw yarn (4), CFRP (6), surfacing (7) tension, it is ensured that they enter heat press-molding apparatus (11) before
Always it is in tensioning state, so that end product stress performance be made to be optimal.
4. the stress band structure that a kind of steel according to claim 2 is combined with CFRP, it is characterised in that: due to CFRP (6)
It is longitudinal in steel and CFRP combined stress band unidirectionally to enhance, so the longitudinal specific strength and specific stiffness of combined stress band are all special
It is not significant.
5. the production method carried out using stress band structure described in claim 1, it is characterised in that:
The implementation process of the production method is as follows, step 1: steel band (1) being sent into pultrusion equipment first, carries out row's yarn
Processing；Using rotary core shaft, carbon fiber raw yarn is drawn from carbon fiber raw yarn tube (4) outer wall, thus is avoided that raw yarn is turned round
The bent neat arrangement to be conducive to carbon fiber；
Step 2: all carbon fibers in raw yarn and fibrofelt are pre-processed using straight trough infusion process；This process is all logical
It is carried out when crossing leaching rouge slot, in entire dipping process, it is necessary to assure carbon fiber and felt arrangement are very neatly arranged；
Step 3: the CFRP of impregnation matrix sequentially passes through tail portion (5), middle part (8) and front pre-forming device (9), with continuous side
To ensure the relative position of it and steel band until moving closer to the final shape of product, and extra resin is discharged in formula transmitting
Bubble is formed subsequently into heating press-molding apparatus (11)；
Step 4: after profile is pulled out heating press-molding apparatus (11), due to molding equipment (11) and pulling equipment (12)
Between have certain distance, therefore the cooling profile by the way of air-cooled；
Step 5: dragger (12) affects the steel after cooling and solidifying to move with CFRP combined stress band, and the size of tractive force uses
50~100kN；Hauling speed uses stepless time adjustment, is 0.1~0.3m/min, if adopting depending on the requirement of the technique of stress zone
With rapid curing formula, hauling speed can be greatly improved；
Step 6: when stress strip length reaches requirement, cutting equipment (13) starts to start work, first by stress zone rubber
Clamp, then alloy cutter starts to cut, and so far, a kind of stress band structure that steel is combined with CFRP is formally formed.
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| CN201910242412.9A CN109881577A (en) | 2019-03-28 | 2019-03-28 | A kind of steel and CFRP combined stress band and preparation method thereof |
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| CN201910242412.9A CN109881577A (en) | 2019-03-28 | 2019-03-28 | A kind of steel and CFRP combined stress band and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112644106A (en) * | 2020-12-17 | 2021-04-13 | 江苏集萃复合材料装备研究所有限公司 | Composite material of plant fiber coated polyurethane foam and preparation method and application thereof |
| CN115749139A (en) * | 2022-12-22 | 2023-03-07 | 贝正南京工程技术有限公司 | Prestressed carbon fiber bar with two-end conical anchoring end and manufacturing method thereof |
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| CN1936206A (en) * | 2006-10-24 | 2007-03-28 | 东南大学 | Steel-continuous-fiber composite-rib reinforced concrete earthquake-resisting structure |
| US20110030155A1 (en) * | 2007-10-09 | 2011-02-10 | Hntb Holdings Ltd | Method for building over an opening via incremental launching |
| KR200471594Y1 (en) * | 2013-10-15 | 2014-03-04 | 주식회사 스틸코리아 | Self-anchored Stress Ribbon Pedestrian Bridges |
| CN104695720A (en) * | 2013-12-09 | 2015-06-10 | 青岛平度市旧店金矿 | Method for reinforcing steel structure through FRP (Fiber Reinforced Polymer) |
| CN105415805A (en) * | 2015-12-25 | 2016-03-23 | 耀奇鑫科技（深圳）有限公司 | Composite material of high-ductility die-reinforced fiber and zinc-plated steel and preparation method thereof |
| CN106835936A (en) * | 2017-03-29 | 2017-06-13 | 哈尔滨工业大学 | A kind of FRP constraint concrete-filled steel tubular arch |
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2019
- 2019-03-28 CN CN201910242412.9A patent/CN109881577A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1936206A (en) * | 2006-10-24 | 2007-03-28 | 东南大学 | Steel-continuous-fiber composite-rib reinforced concrete earthquake-resisting structure |
| US20110030155A1 (en) * | 2007-10-09 | 2011-02-10 | Hntb Holdings Ltd | Method for building over an opening via incremental launching |
| KR200471594Y1 (en) * | 2013-10-15 | 2014-03-04 | 주식회사 스틸코리아 | Self-anchored Stress Ribbon Pedestrian Bridges |
| CN104695720A (en) * | 2013-12-09 | 2015-06-10 | 青岛平度市旧店金矿 | Method for reinforcing steel structure through FRP (Fiber Reinforced Polymer) |
| CN105415805A (en) * | 2015-12-25 | 2016-03-23 | 耀奇鑫科技（深圳）有限公司 | Composite material of high-ductility die-reinforced fiber and zinc-plated steel and preparation method thereof |
| CN106835936A (en) * | 2017-03-29 | 2017-06-13 | 哈尔滨工业大学 | A kind of FRP constraint concrete-filled steel tubular arch |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112644106A (en) * | 2020-12-17 | 2021-04-13 | 江苏集萃复合材料装备研究所有限公司 | Composite material of plant fiber coated polyurethane foam and preparation method and application thereof |
| CN115749139A (en) * | 2022-12-22 | 2023-03-07 | 贝正南京工程技术有限公司 | Prestressed carbon fiber bar with two-end conical anchoring end and manufacturing method thereof |
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