CN102922602A - Process for preparing prefabricated intelligent fiber reinforce plastic (FRP)-concrete composite structure - Google Patents
Process for preparing prefabricated intelligent fiber reinforce plastic (FRP)-concrete composite structure Download PDFInfo
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Abstract
The invention discloses a process for preparing a prefabricated intelligent fiber reinforce plastic (FRP)-concrete composite structure. The process comprises: step one, selecting a field and arranging an anchor plate of the field; step two, preparing intelligent FRP layers; step three stretching and anchoring the FRP layers; step four, manufacturing and installing formworks; step five, binding and installing a reinforcement cage and installing an anchor plate base plate; step six, pouring concrete; and step seven, anchoring the FRP layers, wherein construction members are maintained, pre-stressing force is released after the concrete strength reaches to 70-90% of the strength of the construction members, beam bottom anchoring plate top plates are anchored on beam bottom anchor plate base plates, and then the FRP layers among the formworks and anchored onto the beam bottom anchor plate base plates built on two sides through the beam bottom anchoring plate top plates. The prefabricated intelligent FRP-concrete composite structure has high load-bearing capacity and a self-sensing function and is high in durability and safety and strong in designability. The process is simple, high in production efficiency and stable in quality and is suitable for large-scale prefabrication production of factories.
Description
Technical field
The present invention relates to a kind of preparation technology of the composite concrete structure based on the carbon fiber sensing, belong to smart material and structure, technical field of civil engineering.
Background technology
The precast concrete technology is the sign of suitability for industrialized production.Since 19 the end of the century precast concrete technology begin to apply in the engineering, precast concrete has been widely used in industry and the engineering structure fields such as civil buildings, bridge road, waterwork, tun, is bringing into play irreplaceable effect.
Precast concrete is compared with cast-in-place concrete and is mainly contained following advantage: l) good product quality.Precast concrete product major part is at produce in factory, and working condition is good, and quality is easy to control.According to investigations (Basler, 1963), the concrete strength coefficient of variation of precast concrete plant produced is 7%, and the cast-in-place concrete strength variable coefficient that the job site produces is 17%.The product of prefabricated plant produced is all more guaranteed than the concrete of cast-in-site at aspects such as intensity, density, durability, water proofing properties; Simultaneously plant produced can be used complexity, meticulous template, and the moulding of prefabricated components is full of variety, and concrete surface quality can whitewash well directly and use as the clear-water concrete member.2) production efficiency is high.Precast concrete product major part is produced with the mode of mechanization, automation in factory, and production efficiency is higher than the mode of production of poured in place concrete.3) workman's working condition is good.Because the production equipments that adopt mechanization and automation, workman's working condition and labour intensity all are better than the form of construction work of on-the-spot cast-in-place concrete more.4) little to ambient influnence.With respect to the cast in situs member, precast concrete can strictly be controlled waste water, waste material and noise pollution at produce in factory.5) economize on resources, be beneficial to social sustainable development.Because the plant produced precast concrete adopts Materials with High Strength and prestressing technique more, compares with common cast-in-place concrete and can save in a large number material, can also utilize in a large number waste and old concrete, slag, flyash, industrial waste etc. to produce the precast concrete product.Simultaneously, the dismounting of precast concrete is also relatively easy, and recycling rate of waterused is high after removing the member reparation.These guarantee that to fully rationally utilizing natural resources social sustainable development is significant.
Non-structural element during early stage precast concrete is mainly used in building is such as non-bearing wallboard, architectural decorative component etc.Along with the development of science and technology and the needs of the large production of socialization, the precast concrete technology has had rapidly development, has above-mentioned plurality of advantages, can be used for the bearing member.Recently, Materials with High Strength and prestressing technique in precast construction, have been adopted, significantly improved the performance of precast construction, the new structures such as node such as Large Span Prestressed Beam, flap, T-shaped plate, prestressing force splicing have appearred, and in civil engineering, be widely used, particularly at long-span bridges.
The on-the-spot installation of prefabricated components also adopts the mechanization modes to construct more, do not need or seldom cast-in-place concrete operation of needs, reduced the curing time of cast-in-place concrete, and convenient and quick construction is subjected to the impact of season and weather less.Utilize the concrete component of clear-water concrete member or well in advance architectural coating directly to come into operation afterwards in installation, saved fitment process.Adopt the precast concrete technology, guaranteeing that the construction period can significantly shorten on the basis of construction quality, under the social desirability that labor cost increases gradually He people-oriented, thus the raising that brings overall economic efficiency.
In recent years, development and renewal along with material, fiber-resin composite (FRP) is used in the civil engineering, its tensile strength is more than 5 times of ordinary carbon steel, and density only has 1/3 to 1/5 of steel, and have good corrosion-resistant/durability, since exploitation, just received much attention always.Carbon fibre reinforced composite (CFRP) is a very important class in the FRP composite, have the superior mechanical property and the physical and chemical performance that surpass general fibrous material, density only has 1/4th of ordinary low-carbon steel, but hot strength has about 10 times, have the anti-fatigue performance higher than ordinary metallic material, thermal coefficient of expansion is almost nil, and corrosion resistance is good.The elastic modelling quantity of high-strength carbon fiber (230GPa) is substantially suitable with ordinary low-carbon steel, but the elastic modelling quantity of high elastic modulus carbon fiber can reach more than 3 times of common iron and steel.In addition, carbon fiber also has good electric conductivity and piezoresistive effect.Utilize its electric property can make intelligence sensor, it has been carried out more research both at home and abroad.Utilize the facility in its good mechanical property and the construction can be used for reinforcing or the reparation damaged structure, because the FRP composite has good corrosion resistance, (particularly Northern Europe, the U.S. etc. need to use the countries and regions of a large amount of snow melt salt winter) actively developed with the FRP composite and replaced traditional steel (as being made into FRP muscle Transducers Embedded in Concrete) to make the research of xoncrete structure both at home and abroad, with the harm of avoiding corrosion of steel in the concrete to be brought.Owing to these characteristics of FRP, be regarded as a kind of comparatively ideal material of precast prestressed concrete structure.
Although the prefabricating common concrete structure is used in earthwork engineering in a large number, exist span little, from the shortcoming such as great, that cracking resistance is poor; The appearance of precast prestressed concrete, although so that span, deadweight, cracking resistance have had preferably improves, also have some defectives: 1) durability, the corrosion of presstressed reinforcing steel and concrete carbonization etc. have a strong impact on the durability of prestressed concrete; 2) loss of prestress, pipe friction power loss (because prestressed material carries out stretch-draw in pipeline, more away from stretching end, losing larger) all seriously influences prestressing force; 3) prefabricated quality, the quality of prestressed concrete pipe road mud jacking is difficult to be guaranteed.
And the FRP-composite concrete structure, because FRP has preferably durability, and FRP sticks on concrete surface, can concrete and inner reinforcing bar be protected preferably, hinders concrete carbonization and can guarantee construction quality.Yet also exist some shortcomings: 1) the adhesive material utilization rate is low usually, and fails to take full advantage of the high powerful feature of FRP; 2) fragility defective, FRP is complete linear elastic materials, belongs to typical brittle break, under seismic loading, has that S. E. A. is low, ductility is not enough; 3) interface a little less than, the technique relative complex.
Summary of the invention
Technical problem:The preparation technology who the purpose of this invention is to provide a kind of prefabricated intelligent FRP-composite concrete structure, this method for prefabricating can satisfy the demand of precast plant's large-scale production, and technique is simple, is fit to batch production mechanization Prefabrication, and make efficiency is high, quality guarantee rate is high.And this composite construction can fully improve the utilization rate of FRP composite, guarantees the bond effect of FRP layer and xoncrete structure, reduces the consumption of concrete and reinforcing bar, alleviate the deadweight of member, improve the ductility of structure, and possess the self-sensing function, farthest bring into play the structural safety serviceability.This intelligence structure can be used for bridge structure and high level, strides greatly, in the large complicated building.And precasting process is simple, is convenient to large-scale production.
Technical scheme:
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of preparation technology of prefabricated intelligent FRP-composite concrete structure is characterized in that: may further comprise the steps:
The arrangement of the selection in the first step, place and place anchor plate: the quantity according to prefabricated components is selected the place, and installs the place anchor plate of anchoring FRP layer on the both sides, place;
The preparation of second step, intelligent FRP layer: according to the size in place, carbon fiber and other fiber are carried out blanking, and install electrode at carbon fiber;
The stretch-draw anchor of the 3rd step, FRP layer: to FRP layer layering dipping, smearing structure glue and spill particle diameter at the stone of 2.5-15mm on the structure glue upper berth before the stretch-draw of FRP sheet material, stretch-draw FRP layer and be anchored in the place anchor plate under the structure glue semi-cured state;
Making and the installation of the 4th step, template: make corresponding template according to the size of member, install first the template on structure both sides and the template of both sides, and at the template on both sides and the inner installation of the template Arc moulding board of both sides, and fix;
The 5th step, the colligation of steel reinforcement cage and the installation of installation and anchor plate base plate: the good steel reinforcement cage of colligation is placed in the template, pass through beam side screw rod anchoring beam side anchor plate base plate in the template of both sides simultaneously, anchor plate base plate at the bottom of Arc moulding board is by screw rod anchoring beam at the bottom of the beam;
The 6th step, casting concrete: configuration makes up required concrete, and build, vibration compacting;
The 7th step, the anchoring of FRP layer: member is carried out maintenance, treat that concrete strength reaches the 70-90% of its intensity, discharge 30% with interior prestressing force, anchor plate top board at the bottom of anchoring beam on the anchor plate base plate at the bottom of the beam, then cut off the FRP layer between template and template, and pass through beam side anchor plate roof bolting on the beam side anchor plate base plate that makes up both sides.
In described second step, when carbon fiber and other fiber carry out blanking below pad one deck isolated material.
The radian of circular arc mould is 1/4 circular arc, and the radius of circular arc is generally and makes up high 1/8-1/4.
The prefabricated intelligent FRP-composite concrete structure of the present invention mainly comprises: the composition of composite construction and design, prefabricating technique, anchorage technology.
, composite construction composition and design
Composite construction is comprised of intelligent FRP layer, concrete (beam/plate etc.), anchoring piece.
1) intelligent FRP layer mainly adopts the fiber hybrid of carbon fiber and high ductility.
That mentions here mixes the connotation that comprises two aspects.
It is mixing of mechanical property on the one hand.That is, by mixing between the variety classes carbon fiber (comprise the carbon fiber kind choose, mix ratio is set and the distribution form of various fiber on the cross section etc.), improve initial elastic modulus, bearing capacity and needed other performances of composite; After damage appears in high modulus fibre, other fibers (middle modulus carbon fiber, high-strength carbon fibre or high ductility fiber) can continue to play a role, thereby make fiber hybrid composite have good stable secondary rigidity, and the indexs such as its secondary rigidity, maximum load capacity and limiting strain can effectively be optimized and control by rational hybrid design.
Mixing of sensing capabilities on the other hand.Fibrous material by mixing low-cost high ductility (such as, fibers such as basalt fibre, glass fibre) can better improve the Measurement sensibility of intelligent hybrid FRP layer, also can reduce significantly the cost of composite and structure.In addition, can effectively reduce the corresponding range of strain of intelligent hybrid FRP composite small resistor rate of change by mixing high-elastic modules carbon fibre, making simultaneously resistance change rate be phase step type with strain changes, can guarantee that by rational hybrid design each resistance step is corresponding with a certain specific failure stage (form) of structure, make intelligent FRP-composite concrete structure have warning function based on the destroying concrete structure stage.Immingling technology is not only effectively avoided fibrous composite " fragility " defective, comprehensively improved the mechanical property of fiber hybrid composite, and optimized the self-sensing function of fiber hybrid composite, while is owing to carbon fiber is expensive, mix the making price that other fibers have also reduced intelligent FRP laminate, it more can be widely used in the Practical Project.
2) intellectuality of FRP layer mainly utilizes piezoresistive effect and the electric conductivity of carbon fiber, according to the needs of practical structures, in FRP layer installing electrodes, then directly can carry out Real-Time Monitoring by instrument.
3) stressing conditions of actual components in the design consideration engineering of composite construction is selected suitable FRP layer and relevant anchoring piece and is configured the concrete component of respective strengths, bears the suffered load of member by the FRP-composite concrete structure.
2, the prefabricating technique of composite construction
Composite construction is prefabricated in precast plant, according to design and the market demand of composite construction, can carry out well personnel's allotment, and pipelining is increased work efficiency greatly, for the demand in market.
The prefabricated flow process of prefabricated components substantially all is complete at precasting yard, and the industrialization labor productivity is high, and production environment is stable, and setting and the standardization of member are conducive to mechanization production, and by the standard close inspection product that dispatches from the factory, can guarantee preferably prefabricated quality.Simultaneously, can carry out necessary maintenance to member.In the situation of duration anxiety, can select to adopt steam curing, do like this and can save the duration.
The template that member adopts can select punching block also can select wooden model.The angle, two ends is done in the arc-shaped, reduce stress and concentrate, and the FRP layer has preferably constraint at the circular arc place to concrete.
Bonding between FRP layer and the concrete adopts " wet method " bonding.Do like this and can guarantee that FRP layer and concrete interface have preferably bonding, simultaneously constructability.
, anchorage technology
Anchor plate is divided into anchor plate and two ends anchor plate at the bottom of the beam.Design according to the anchor plate of safe handling grade to two positions.The safe class of anchor plate is lower than the anchor plate at two ends at the bottom of the beam, when the tension of FRP layer reaches the 50%-80% of its tensile strength (specifically can designing according to concrete form and the performance requirement of structure), destroying appears in the anchor plate at the bottom of the beam, the interface occurs peeling off and slippage simultaneously, then the load on the anchor plate is slowly transferred to the two ends anchor plate at the bottom of the beam, is born by the two ends anchor plate.By the destruction of anchor plate at the bottom of the beam and peeling off and slippage of interface, absorbed energy improves structural damage ductility.When anchor plate at the bottom of the beam destroyed fully, larger distortion had occured in structure, and ductility fully is improved.As long as serious destruction does not appear in reinforced concrete member, just can replace the FRP layer, again anchoring is convenient to repair.
Anchoring is divided into the anchoring of monoblock FRP plate FRP plate on anchoring that precasting yard is located in and each member.
For monoblock FRP plate, the FRP layer by the 5%-10% of jack tension above former prestressing force design load, then is anchored on the steel plate on both sides, prefabricated place, steel plate has sufficient intensity and rigidity, prevents loss of prestress.
The anchoring of FRP plate on each member after concrete strength reaches some strength, is put Zhang Yiding prestressing force amount.Then then the anchor plate at the bottom of the anchoring beam puts whole prestressing force, cuts off the FRP plate between beam, and this part is anchored in the anchor plate at two ends.
Beneficial effect:
The quality of interfacial bond property and prefabricated composite construction is fully guaranteed.Intelligence FRP layer and concrete interface pass through " wet method bonding ", and all fabrication processings all finish in precast plant, can fully guarantee bond effect and the composite construction quality of FRP layer and concrete interface.
Precasting process is simple, is applicable to large tracts of land and builds.Prefabricated flow process can be divided into making and the stretch-draw of intelligent FRP layer, the making of template, the colligation of steel reinforcement cage, the anchoring of casting concrete and anchor plate.Simple technological process is convenient to precasting yard and is made member.Mechanized production technique more can be increased work efficiency, and guarantees faster speed of application, for the market demand.
Security performance has obtained abundant guarantee.Member adopts two anchor plate anchorings, and namely respectively there are two anchor plates at the two ends of member, one be positioned at beam at the bottom of anchoring, another is that to be positioned at the beam side anchor solid.The safe design grade of anchor plate is a little less than beam limit anchor plate at the bottom of the beam, anchoring is mainly used in the prestressed anchoring of FRP layer at the bottom of the beam, the anchor plate on beam limit is mainly used in safety guarantee, and after namely anchor plate occur to destroy at the bottom of the beam, the interface occurred peeling off or the phenomenon such as slippage, the anchor plate on beam limit is still in running order, intelligent FRP layer is still played anchorage effect, thereby reach the effect of " no damage in small earthquake, middle shake can be repaiied; no collapsing with strong earthquake " or " badly not falling ", fully improved the security performance of member.
Recoverability is strong.After member is used for structure, in the member military service afterwards, if there is general fatigue rupture or the destruction of recoverability, but direct replacement intelligence FRP layer.If there is larger broken the changing of loss, but the whole member of direct replacement.So just in the part total is repaired, little to the normal use influence degree of total or building.
Weak location is strengthened.The base plate anchored end of beam is weak location.By changing the right angle, end into circular arc, the FRP layer has preferably concrete to be strengthened, and has reduced the possibility that the weak location appearance destroys.
Comprehensive mechanical property is improved.Intelligence FRP layer and reinforced concrete core bonding, can significantly improve the comprehensive mechanical property of composite construction by composite intelligent FRP layer, such as mechanical properties such as bearing capacity (cracking load, yield load, ultimate load etc.), secondary rigidity, antifatigue, creep resisting abilities.
The raising of anticorrosive and endurance quality.Intelligence FRP layer has excellent resist chemical performance, by can effectively preventing the corrosion of the inner reinforcing bar of intelligent FRP-composite concrete structure behind the bonding FRP layer, thereby improves corrosion resistance and the life cycle of composite construction.
Prestressing force and anchorage technology have been given full play to the performance characteristic of material.The FRP composite has high tensile strength, and common stickup can't have been given play to the high feature of its high-tensile, can give full play to its material behavior such as high-strength by prestressing technique; And the steel plate anchoring can prevent in the slippage between intelligent FRP layer and reinforced concrete interface under the larger stressing conditions, effectively reduce intelligent FRP-composite concrete structure make and the military service process in loss of prestress.In addition, the pre-stress FRP layer can significantly improve the ability of the cracking resistance ability of composite construction and the cracking resistance seam development after the appearance of crack; Simultaneously, prestressed apply can be to a certain degree minimizing amount of reinforcement, reduce cost.
Intellectuality has improved security and the added value of composite construction.Based on piezoresistive effect and the electric conductivity of carbon fiber self, make the FRP-composite concrete structure have good self-monitoring function, reach the dual-purpose effect of a material, can significantly improve security and the added value of composite construction; In addition, by prestressing force with mix the self-sensing performance that non-conductive fibrous material can significantly be improved intelligent FRP composite, stability and the precision particularly measured.In addition, by the resistance variations of monitoring carbon fiber, can monitor the loss of prestress of intelligent FRP-composite concrete structure.
Mixing of carbon fiber and other fibers, can give full play to the mechanical property of various fibers, also more be conducive to the self-sensing performance of intelligent FRP layer and composite construction, also effectively reduce the cost of FRP simultaneously, make it be fit to be widely used in the Practical Project.From economic angle, the dual-purpose material of both having saved of a material of FRP composite has reduced cost, can create good economic benefit again simultaneously.From the production angle, precasting process is simple, is convenient to prefabricated on a large scale.
Description of drawings:
Fig. 1 intelligence FRP layer and anchoring schematic top plan view;
Fig. 2 " wet method " barbola work schematic diagram;
Fig. 3 place template structure of arranging schematic diagram;
Fig. 4 structure of transvers plate schematic diagram;
At the bottom of Fig. 5 steel reinforcement cage and the beam and the both sides base plate lay schematic diagram;
The prefabricated intelligent FRP-composite concrete structure organigram of Fig. 6.
The amount of deflection of three kinds of different components of Fig. 7-load contrast schematic diagram.
Among the figure: 1, prefabricated place, 2, intelligent FRP layer, 3, the stretch-draw anchor plate, 4, template, 5, circle curve template, 6, the beam cheek board, 7 side templates, 8, anchor plate base plate at the bottom of the beam, 9, beam side anchor plate base plate, 10, screw rod at the bottom of the beam, 11, beam side screw rod, 12 steel reinforcement cages, 13, coarse aggregate, 14 build armored concrete, and 15, electrode, 16, anchor plate top board at the bottom of the beam, 17, beam side anchor plate top board, 18 armored concrete.
The specific embodiment:
1) making of anchor plate.
Anchor plate is divided into anchor plate and end anchorage plate at the bottom of the beam.Design grade and safe design collapse state according to load design anchor plate at the bottom of the beam and end anchorage plate respectively.The destruction grade of end anchorage plate is higher than anchor plate at the bottom of the beam, guarantees to be anchored at the 50%-80% failure that the FRP layer reaches its ultimate strength at the bottom of the beam, and the anchor plate at two ends is in running order all the time.
Each anchor plate includes top board and base plate.The anchor plate inner surface is made into corrugated, and the suggestion ripple is 0.6-1.2mm deeply, can increase the mechanical riveted ability between intelligent FRP layer and the anchor plate.Determine size (length, width, thickness) and the size of the perforate on the anchor plate of anchor plate according to the tension force dynamics of the size of prefabricated reinforced concrete and intelligent FRP layer.
2) colligation of steel reinforcement cage.
To the distributed steel requirement of member, the steel reinforcement cage of concrete component is carried out colligation according to design, colligation meets regulation and stipulation.
3) making of template
According to the design size of member, select and make corresponding template.Template can select punching block also can select wooden model.Template is divided into the template of member both sides, the template on both sides and the circle curve template (shown in Figure 4) at base angle, both sides thereof.Length and the wide decision by member of the template of both sides, the template on both sides is by the wide and high decision of member.The radian of circle curve template is 1/4 circular arc.The radius of circular arc is generally the 1/8-1/4 of deck-molding.The suggestion circle curve template adopts the punching block making to be convenient to like this fix.
4) precasting process flow process
According to quantity and the size of prefabricated components, select suitable place, site clearing is clean, and install place anchor plate (shown in Figure 1) at two ends.
According to designing requirement, fiber is carried out blanking, the length of blanking will satisfy prefabricated requirement (comprising the anchoring of fiber and the stretch-draw of jack), select kind and the size (length, width, thickness) of suitable carbon fiber (modulus, intensity) and other fiber, place other fiber inboard on carbon fiber.Pad one deck plastic paper is as isolated material below fiber simultaneously, and when avoiding flooding brush coating in the back, fiber and place bond.
According to the position of designing requirement at needs layout electrode, at first remove the size of this position carbon fiber surface, then smear conducting resinl, conducting resinl is evenly smeared along the carbon fiber width; For the contact-making surface that increases electrode and carbon fiber and reduce contact resistance between electrode and the fiber, the carbon fiber upper and lower surface is all smeared conducting resinl, to strictly control simultaneously the width (usually being less than 0.5cm) of conducting resinl, reduce the impact on the hybrid fiber cloth mechanical property.Conducting resinl smear complete after, straight placement is placed plastic paper through removing the wire of surface oxide layer on the surface, avoid adjacent fiber cloth mutually to bond, and is unfavorable for the layering impregnation.The quantity of electrode can consider that generally the distance between adjacent two electrodes is not less than 20cm according to a plurality of factors such as the length of intelligent FRP layer, damage positioning accuracies.
After electrode is made the fiber of selecting is carried out layering brush coating dipping, the dipping scope is at the bottom of the beam between the anchor plate, and in the process of brush coating fiber cloth is applied certain pretension, guarantees that fiber is in straight state all the time.
Intelligence FRP sheet material and concrete interface adopt " wet method " bonding, wait to flood completely directly to be coated with one deck structure glue at FRP sheet material upper surface, spill particle diameter on the structure glue upper berth at the stone (stone needs water to clean up) (shown in Figure 2) of 10-15mm.
Under structure glue is in semi-cured state, according to the size of prestressing force design or the size of intelligent FRP ply strain the FRP plate is controlled stretch-draw, move to when surpassing original prestressed size of design or strain 5%-10%, stop stretch-draw, and be anchored on the steel plate anchoring piece on both sides, prefabricated place, avoid loss of prestress.To needing at the bottom of the mounting rail position of anchor plate base plate to carry out mark, and indicate corresponding aperture position.To be marked complete after, slowly put tension prestress.Then in the perforate of the position of mark, so that the screw rod anchoring of back.
This moment, structure glue was still under the semi-cured state, stretch-draw FRP layer again, and the stretch-draw amount surpasses original prestressed size of design or strain 5%-10%, and anchoring is good again.The template of both sides is installed in the relevant position, both sides of FRP plate, the template on both sides then is installed, template is fixed.Put into Arc moulding board at angle, template two ends at last, and fix, to prevent the phenomenons such as slippage occurring when the casting concrete, affect pouring quality.And leave certain distance between the template of adjacent two members, be anchored on the anchoring piece at beam two ends (shown in Figure 3) in order to the FRP layer after cutting off between adjacent forms there being enough length.The last installation quality that again checks template.
With at the bottom of the steel reinforcement cage and beam made in advance, the anchor plate base plate on both sides all puts into template, and is plugged screw rod, screw rod one end exceeds the certain distance of base plate, is used for the anchoring top board; The other end leaves certain length in template, do like this to be connected with concrete.Simultaneously two base plates and screw rod are anchored on template and the reinforcing steel bar cage by welding or other modes, avoid when casting concrete, causing two base plates and screw rod that moving or tilt (shown in Figure 5) in the displacement arranged.
Check again the quality of template and the fixed mass of anchor plate base plate and screw rod, and the anchoring quality of FRP plate, to prevent unnecessary accident occurring at casting concrete.
According to designing requirement, the concrete of configuration respective strengths, and place template (structure glue of this moment is in semi-cured state), vibrated concrete is to guarantee the quality of concreting.
Member is carried out maintenance, treat that concrete strength reaches the 70-90% of its intensity, put a partial prestressing, this part prestressing force is born by the interface.Anchor plate base plate brush one deck structure glue is installed top board at the bottom of beam, and good with the nut anchoring.
Prestressing force is all put, form removal, intelligent FRP layer between adjacent forms is cut off with scissors altogether from the centre, and intelligent FRP layer relevant position perforate with the anchorage screw that can be anchored in the beam both sides on, then the intelligent FRP layer on anchor plate both sides at the bottom of the beam carried out the layering dipping, and in concrete surface and beam both sides anchor plate base plate brush one deck structure glue, intelligent FRP layer is well-bonded to beam limit anchor plate base plate and concrete from circular arc, and tapping is placed on the screw rod the last good top board of anchoring.
According to this, repeat the prefabricated of next group.
Adopt the two anchoring HCFRP-concrete composite beams of the present invention, amount of deflection obviously is better than single anchoring HCFRP-concrete composite beam and common reinforced beam under the effect of load, and its test curve as shown in Figure 7.
Claims (3)
1. the preparation technology of a prefabricated intelligent FRP-composite concrete structure is characterized in that: may further comprise the steps:
The arrangement of the selection in the first step, place and place anchor plate: the quantity according to prefabricated components is selected the place, and installs the place anchor plate of anchoring FRP layer on the both sides, place;
The preparation of second step, intelligent FRP layer: according to the size in place, carbon fiber and other fiber are carried out blanking, and on carbon fiber installing electrodes;
The stretch-draw anchor of the 3rd step, FRP layer: to FRP layer layering dipping, smearing structure glue and spill particle diameter at the stone of 2.5-15mm on the structure glue upper berth before the stretch-draw of FRP sheet material, stretch-draw FRP layer and be anchored in the place anchor plate under the structure glue semi-cured state;
Making and the installation of the 4th step, template: make corresponding template according to the size of member, install first the template of member two ends and both sides, and in the template inside of two ends and both sides Arc moulding board is installed, and fix;
The 5th step, the colligation of steel reinforcement cage and the installation of installation and anchor plate base plate: the steel reinforcement cage that colligation is good is placed in the template, pass through member side screw rod anchoring beam side anchor plate base plate in the template of both sides simultaneously, anchor plate base plate at the bottom of Arc moulding board is by screw rod anchoring beam at the bottom of the beam;
The 6th the step, casting concrete: the concrete that layout structure is required, and build, vibration compacting;
The 7th step, the anchoring of FRP layer: member is carried out maintenance, treat that concrete strength reaches the 70-90% of its intensity, discharge 30% with interior prestressing force, anchor plate top board at the bottom of anchoring beam on the anchor plate base plate at the bottom of the beam, then cut off the FRP layer between template and template, and pass through beam side anchor plate roof bolting on the beam side anchor plate base plate on member both sides.
2. the preparation technology of prefabricated intelligent FRP-composite concrete structure according to claim 1 is characterized in that: in described second step, when carbon fiber and other fiber carry out blanking below pad one deck isolated material.
3. the preparation technology of prefabricated intelligent FRP-composite concrete structure according to claim 1 and 2, it is characterized in that: the radian of circular arc mould is 1/4 circular arc, the radius of circular arc is generally the high 1/8-1/4 of member.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113338364A (en) * | 2021-06-11 | 2021-09-03 | 广东工业大学 | Marine concrete reinforcing method |
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|---|---|---|---|---|
| CN103321430A (en) * | 2013-06-07 | 2013-09-25 | 华北水利水电大学 | Construction method of reinforcing large-span concrete structure with prestressed carbon fiber sheet |
| CN103321430B (en) * | 2013-06-07 | 2015-08-12 | 华北水利水电大学 | Pre-stressed carbon fiber sheet material is reinforced greatly across the construction method of concrete structure |
| CN104805774A (en) * | 2015-03-16 | 2015-07-29 | 济南市市政工程设计研究院（集团）有限责任公司 | Prestressing complex fiber reinforcing device for concrete slab beam and implementation process |
| CN107269021A (en) * | 2017-07-19 | 2017-10-20 | 深圳大学 | The power consumption auxiliary cushion block and reinforcement means of Shear Strengthening are carried out to concrete component |
| CN111923226A (en) * | 2020-06-02 | 2020-11-13 | 广东永基建筑基础股份有限公司 | Flat pile production method |
| CN111923226B (en) * | 2020-06-02 | 2022-04-12 | 广东永基建筑基础股份有限公司 | Flat pile production method |
| CN113338364A (en) * | 2021-06-11 | 2021-09-03 | 广东工业大学 | Marine concrete reinforcing method |
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