CN112277154A - Production method of FRP rib precast beam - Google Patents
Production method of FRP rib precast beam Download PDFInfo
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- CN112277154A CN112277154A CN202011167378.2A CN202011167378A CN112277154A CN 112277154 A CN112277154 A CN 112277154A CN 202011167378 A CN202011167378 A CN 202011167378A CN 112277154 A CN112277154 A CN 112277154A
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- precast beam
- frp
- concrete
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- frp rib
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Composite Materials (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a production method of an FRP rib precast beam, which specifically comprises the following steps: s1, preparing FRP ribs: the invention relates to the technical field of precast beam production, in particular to a method for manufacturing a multi-strand continuous fiber bundle, which comprises the steps of firstly drying a plurality of strands of continuous fibers, then putting the dried plurality of strands of continuous fibers into a grease dipping tank filled with glue solution, so that the plurality of strands of connecting fibers are fully dipped with the glue solution, and bundling the dipped plurality of strands of connecting fibers into a fiber bundle whole through a buncher. According to the production method of the FRP rib precast beam, the reinforcing steel bars used in the prior art are replaced by the FRP ribs, the problem of poor durability of a concrete structure in the precast beam caused by corrosion of the reinforcing steel bars is solved, the problems of heavy weight, low tensile strength and the like of common reinforcing steel bars are solved, the overall performance of the precast beam is enhanced, the service life of the precast beam is prolonged, the FRP ribs are low in density and light in specific gravity, the precast beam can be hoisted through suspension cables or inclined cables, the spanning capacity of a bridge can be remarkably improved, and the FRP ribs can be rapidly and widely applied to actual engineering.
Description
Technical Field
The invention relates to the technical field of precast beam production, in particular to a production method of an FRP rib precast beam.
Background
The FRP rib is formed by gluing a plurality of strands of continuous fibers (such as glass fibers, carbon fibers and the like) through base materials (such as polyamide resin, polyethylene resin, epoxy resin and the like), extruding the glued continuous fibers through a special die and drawing the glued continuous fibers, wherein common fiber materials adopted by the FRP rib generally comprise glass fiber reinforced plastics, carbon fiber reinforced plastics, aramid fiber reinforced plastics (AFRP rib) and the like.
The precast beam is prefabricated in a factory and then is transported to a construction site to be installed and fixed according to the position required by the design.
At present, the precast beam is mostly formed by pouring reinforcing steel bars and concrete, but the reinforcing steel bars are easy to corrode, so that the structure of the precast beam is prematurely degraded or the structural function is insufficient, the durability of the precast beam is influenced, and when the precast beam is hoisted through suspension cables or stay cables in the subsequent process, the construction difficulty is increased due to the heavier weight of the reinforcing steel bars, so that the invention provides the production method of the FRP rib precast beam aiming at the defects.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a production method of an FRP rib precast beam, which solves the problems that the interior of the existing precast beam is reinforced by adopting steel bars, the internal steel bars are easy to corrode, the structure of the precast beam is prematurely degraded or the structure function is insufficient, the durability of the precast beam is influenced, and the construction difficulty is increased due to the heavier weight of the steel bars when the precast beam is hoisted by suspension cables or inclined cables subsequently.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a production method of an FRP rib precast beam specifically comprises the following steps:
s1, preparing FRP ribs: firstly, drying a plurality of strands of continuous fibers, then putting the dried plurality of strands of continuous fibers into a grease dipping tank filled with glue solution, so that the plurality of strands of connecting fibers are fully dipped with the glue solution, bundling the plurality of strands of connecting fibers after being dipped into a fiber bundle whole through a buncher, simultaneously extruding redundant glue solution on the fiber bundle under the action of confining pressure in the buncher, then pressing the fiber preformed bundle into a required shape through a mould by using a special mould, then stretching the fiber preformed bundle through a drafting machine, and forming the fiber preformed bundle when the fiber preformed bundle is stretched to a specified length to finally prepare the FRP (fiber reinforced plastic) bar;
s2, building a framework of the FRP ribs: splicing and building the FRP ribs manufactured in the step S1 to form a frame structure of the precast beam, bundling and fixing the cross points among the FRP ribs by using steel wires in the building process, and welding and reinforcing the cross points among the FRP ribs after the building is finished;
s3, preparation of concrete: selecting concrete with corresponding strength grade according to the application of the precast beam, then pouring the concrete into a concrete stirrer, selecting the proportion of added sand and other materials according to the use requirement, and finally fully and uniformly stirring all the raw materials and standing for 20-30 min;
s4, cleaning a mould and pouring concrete: selecting a using mold of the precast beam, cleaning the surface of the mold, removing impurities such as surface burrs and the like, ensuring that the interior of the mold cavity is kept dry and tidy, coating a layer of release agent in the mold cavity, placing the FRP rib frame built in the step S2 in the mold after the pretreatment is finished, slowly pouring the concrete in the step S3 in the mold after the angle, the height and the position of the frame are adjusted, intentionally installing other embedded parts in the pouring process, and vibrating the concrete after the pouring is finished;
s5, completing the preparation of the FRP rib precast beam: according to the step S4, after the concrete in the mold is completely solidified, the parts of the mold are removed one by one, then the prepared FRP rib precast beam is taken out, then the FRP rib precast beam is sent into a curing room for curing, the codes are modified, after the curing is finished, burrs are trimmed on the FRP rib precast beam, and then the codes are sprayed on the bridge plate, so that the production batch and operators of the FRP rib precast beam can be tracked later.
Preferably, the molding temperature in the step S1 is 180-320 ℃, and the molding time is 10-15 min.
Preferably, the plurality of continuous fibers in step S1 are glass fibers and carbon fibers.
Preferably, the moisture content of the plurality of continuous fibers is controlled to be reduced to below 40ppm after the drying process in the step S1.
Preferably, the glue solution in step S1 is one of polyamide resin, polyethylene resin and epoxy resin.
(III) advantageous effects
The invention provides a production method of an FRP rib precast beam. The method has the following beneficial effects: the production method of the FRP rib precast beam comprises the following steps of S1, FRP rib preparation: firstly, drying a plurality of strands of continuous fibers, then putting the dried plurality of strands of continuous fibers into a grease dipping tank filled with glue solution, so that the plurality of strands of connecting fibers are fully dipped with the glue solution, bundling the plurality of strands of connecting fibers after being dipped into a fiber bundle whole through a buncher, simultaneously extruding redundant glue solution on the fiber bundle under the action of confining pressure in the buncher, then pressing the fiber preformed bundle into a required shape through a mould by using a special mould, then stretching the fiber preformed bundle through a drafting machine, and forming the fiber preformed bundle when the fiber preformed bundle is stretched to a specified length to finally prepare the FRP (fiber reinforced plastic) bar; s2, building a framework of the FRP ribs: splicing and building the FRP ribs manufactured in the step S1 to form a frame structure of the precast beam, bundling and fixing the cross points among the FRP ribs by using steel wires in the building process, and welding and reinforcing the cross points among the FRP ribs after the building is finished; s3, preparation of concrete: selecting concrete with corresponding strength grade according to the application of the precast beam, then pouring the concrete into a concrete stirrer, selecting the proportion of added sand and other materials according to the use requirement, and finally fully and uniformly stirring all the raw materials and standing for 20-30 min; s4, cleaning a mould and pouring concrete: selecting a using mold of the precast beam, cleaning the surface of the mold, removing impurities such as surface burrs and the like, ensuring that the interior of the mold cavity is kept dry and tidy, coating a layer of release agent in the mold cavity, placing the FRP rib frame built in the step S2 in the mold after the pretreatment is finished, slowly pouring the concrete in the step S3 in the mold after the angle, the height and the position of the frame are adjusted, intentionally installing other embedded parts in the pouring process, and vibrating the concrete after the pouring is finished; s5, completing the preparation of the FRP rib precast beam: according to the step S4, after the concrete in the mold is completely solidified, the parts of the mold are removed one by one, then the prepared FRP tendon precast beam is taken out, then the FRP tendon precast beam is sent into a curing room for curing, the decoration coding is carried out, after the curing is finished, the burrs of the FRP tendon precast beam are trimmed, then the coding is sprayed on the bridge plate, so that the production batch and the operators of the FRP tendon precast beam can be tracked later, the problem of poor durability of the concrete structure in the precast beam caused by the corrosion of the steel bars is solved by replacing the steel bars used in the prior art with the FRP bars, the problems of heavy weight, low tensile strength and the like of common steel bars are also overcome, the overall performance of the precast beam is enhanced, the service life of the precast beam is prolonged, the density of the steel bars is small, the specific gravity of the steel bars is light, the FRP bars can be hoisted through suspension cables or inclined cables, the construction is convenient, and the spanning, can be rapidly and widely applied to practical engineering.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a technical solution: a FRP rib precast beam production method, through replacing the steel bar used in the prior art with FRP rib, solve the problem that the concrete structure durability is poor in precast beam because of the corrosion of steel bar, overcome the problems such as the ordinary steel bar is heavy and tensile strength is low too at the same time, has strengthened the wholeness of precast beam, have increased its life, FRP rib density is little, the proportion is light, can hoist and mount through span wire or suspension cable, facilitate the construction, can show the leap ability that improves the bridge, can be used in the actual engineering rapidly and extensively, include the following steps specifically:
s1, preparing FRP ribs: firstly, drying a plurality of strands of continuous fibers, then putting the dried plurality of strands of continuous fibers into a grease dipping tank filled with glue solution, so that the plurality of strands of connecting fibers are fully dipped with the glue solution, bundling the plurality of strands of connecting fibers after being dipped into a fiber bundle whole through a buncher, simultaneously extruding redundant glue solution on the fiber bundle under the action of confining pressure in the buncher, then pressing the fiber preformed bundle into a required shape through a mould by using a special mould, then stretching the fiber preformed bundle through a drafting machine, and forming the fiber preformed bundle when the fiber preformed bundle is stretched to a specified length to finally prepare the FRP (fiber reinforced plastic) bar;
s2, building a framework of the FRP ribs: splicing and building the FRP ribs manufactured in the step S1 to form a frame structure of the precast beam, bundling and fixing the cross points among the FRP ribs by using steel wires in the building process, and welding and reinforcing the cross points among the FRP ribs after the building is finished;
s3, preparation of concrete: selecting concrete with corresponding strength grade according to the application of the precast beam, then pouring the concrete into a concrete stirrer, selecting the proportion of added sand and other materials according to the use requirement, and finally fully and uniformly stirring all the raw materials and standing for 20-30 min;
s4, cleaning a mould and pouring concrete: selecting a using mold of the precast beam, cleaning the surface of the mold, removing impurities such as surface burrs and the like, ensuring that the interior of the mold cavity is kept dry and tidy, coating a layer of release agent in the mold cavity, placing the FRP rib frame built in the step S2 in the mold after the pretreatment is finished, slowly pouring the concrete in the step S3 in the mold after the angle, the height and the position of the frame are adjusted, intentionally installing other embedded parts in the pouring process, and vibrating the concrete after the pouring is finished;
s5, completing the preparation of the FRP rib precast beam: according to the step S4, after the concrete in the mold is completely solidified, the parts of the mold are removed one by one, then the prepared FRP rib precast beam is taken out, then the FRP rib precast beam is sent into a curing room for curing, the codes are modified, after the curing is finished, burrs are trimmed on the FRP rib precast beam, and then the codes are sprayed on the bridge plate, so that the production batch and operators of the FRP rib precast beam can be tracked later.
In the embodiment of the invention, the molding temperature in the step S1 is 180-320 ℃, and the molding time is 10-15 min.
In the embodiment of the invention, the multi-strand continuous fibers in the step S1 are glass fibers and carbon fibers, the glass fibers are inorganic non-metallic materials with excellent performance and are various, and the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength are achieved.
In the embodiment of the present invention, the moisture content of the continuous fibers is controlled to be reduced to less than 40ppm after the drying process in the step S1.
In the embodiment of the present invention, the glue solution in step S1 is one of polyamide resin, polyethylene resin and epoxy resin, the polyamide resin is a condensation polymerization type high molecular compound having a CONH structure in a molecule, and is usually obtained by condensation polymerization of dibasic acid and diamine, the polyethylene resin is a thermoplastic resin obtained by polymerization of ethylene, the epoxy resin is a high molecular polymer, the molecular formula is (C11H12O3) n, which is a generic name of a polymer containing more than two epoxy groups in a molecule, and is a condensation polymerization product of epichlorohydrin and bisphenol a or polyol, due to chemical activity of epoxy groups, a plurality of compounds containing active hydrogen can be used to open a ring, and a network structure is formed by curing and crosslinking, so that the epoxy resin is a thermosetting resin, and bisphenol a type epoxy resin not only has the largest yield and the most variety, but also has an increasing number of new modified varieties, the quality is continuously increasing.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A production method of an FRP rib precast beam is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, preparing FRP ribs: firstly, drying a plurality of strands of continuous fibers, then putting the dried plurality of strands of continuous fibers into a grease dipping tank filled with glue solution, so that the plurality of strands of connecting fibers are fully dipped with the glue solution, bundling the plurality of strands of connecting fibers after being dipped into a fiber bundle whole through a buncher, simultaneously extruding redundant glue solution on the fiber bundle under the action of confining pressure in the buncher, then pressing the fiber preformed bundle into a required shape through a mould by using a special mould, then stretching the fiber preformed bundle through a drafting machine, and forming the fiber preformed bundle when the fiber preformed bundle is stretched to a specified length to finally prepare the FRP (fiber reinforced plastic) bar;
s2, building a framework of the FRP ribs: splicing and building the FRP ribs manufactured in the step S1 to form a frame structure of the precast beam, bundling and fixing the cross points among the FRP ribs by using steel wires in the building process, and welding and reinforcing the cross points among the FRP ribs after the building is finished;
s3, preparation of concrete: selecting concrete with corresponding strength grade according to the application of the precast beam, then pouring the concrete into a concrete stirrer, selecting the proportion of added sand and other materials according to the use requirement, and finally fully and uniformly stirring all the raw materials and standing for 20-30 min;
s4, cleaning a mould and pouring concrete: selecting a using mold of the precast beam, cleaning the surface of the mold, removing impurities such as surface burrs and the like, ensuring that the interior of the mold cavity is kept dry and tidy, coating a layer of release agent in the mold cavity, placing the FRP rib frame built in the step S2 in the mold after the pretreatment is finished, slowly pouring the concrete in the step S3 in the mold after the angle, the height and the position of the frame are adjusted, intentionally installing other embedded parts in the pouring process, and vibrating the concrete after the pouring is finished;
s5, completing the preparation of the FRP rib precast beam: according to the step S4, after the concrete in the mold is completely solidified, the parts of the mold are removed one by one, then the prepared FRP rib precast beam is taken out, then the FRP rib precast beam is sent into a curing room for curing, the codes are modified, after the curing is finished, burrs are trimmed on the FRP rib precast beam, and then the codes are sprayed on the bridge plate, so that the production batch and operators of the FRP rib precast beam can be tracked later.
2. The production method of the FRP rib precast beam as claimed in claim 1, wherein: the molding temperature in the step S1 is 180-320 ℃, and the molding time is 10-15 min.
3. The production method of the FRP rib precast beam as claimed in claim 1, wherein: the plurality of continuous fibers in step S1 are glass fibers and carbon fibers.
4. The production method of the FRP rib precast beam as claimed in claim 1, wherein: and controlling the water content of the continuous fibers to be reduced to below 40ppm after the drying treatment in the step S1.
5. The production method of the FRP rib precast beam as claimed in claim 1, wherein: the glue solution in the step S1 is one of polyamide resin, polyethylene resin and epoxy resin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011167378.2A CN112277154A (en) | 2020-10-28 | 2020-10-28 | Production method of FRP rib precast beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011167378.2A CN112277154A (en) | 2020-10-28 | 2020-10-28 | Production method of FRP rib precast beam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134369A (en) * | 2006-09-01 | 2008-03-05 | 深圳市海川实业股份有限公司 | Technique of preparing FRP fibre-reinforced composite material bar |
| CN102936940A (en) * | 2012-11-12 | 2013-02-20 | 北京工业大学 | Enhanced ultra-high-performance concrete component made of mixed fiber reinforced plastic (FRP) bars |
| CN107217788A (en) * | 2017-04-28 | 2017-09-29 | 郑州大学 | Full FRP muscle enhancing ECC Combined concrete beams and preparation method thereof |
| CN107297810A (en) * | 2017-07-21 | 2017-10-27 | 中建八局第建设有限公司 | A kind of making of precast wall body component and installation method |
| CN108797888A (en) * | 2018-08-30 | 2018-11-13 | 河北建筑工程学院 | A kind of non-dismantling formwork formula FRP proximate matter high strength steel fiber reinforced concrete beams and its construction method |
| WO2020206540A1 (en) * | 2019-04-12 | 2020-10-15 | Carbicrete Inc. | Production of wet-cast slag-based concrete products |
-
2020
- 2020-10-28 CN CN202011167378.2A patent/CN112277154A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134369A (en) * | 2006-09-01 | 2008-03-05 | 深圳市海川实业股份有限公司 | Technique of preparing FRP fibre-reinforced composite material bar |
| CN102936940A (en) * | 2012-11-12 | 2013-02-20 | 北京工业大学 | Enhanced ultra-high-performance concrete component made of mixed fiber reinforced plastic (FRP) bars |
| CN107217788A (en) * | 2017-04-28 | 2017-09-29 | 郑州大学 | Full FRP muscle enhancing ECC Combined concrete beams and preparation method thereof |
| CN107297810A (en) * | 2017-07-21 | 2017-10-27 | 中建八局第建设有限公司 | A kind of making of precast wall body component and installation method |
| CN108797888A (en) * | 2018-08-30 | 2018-11-13 | 河北建筑工程学院 | A kind of non-dismantling formwork formula FRP proximate matter high strength steel fiber reinforced concrete beams and its construction method |
| WO2020206540A1 (en) * | 2019-04-12 | 2020-10-15 | Carbicrete Inc. | Production of wet-cast slag-based concrete products |
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