CN117721955A - Winding forming FRP combined stirrup concrete structure - Google Patents
Winding forming FRP combined stirrup concrete structure Download PDFInfo
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- CN117721955A CN117721955A CN202311060801.2A CN202311060801A CN117721955A CN 117721955 A CN117721955 A CN 117721955A CN 202311060801 A CN202311060801 A CN 202311060801A CN 117721955 A CN117721955 A CN 117721955A
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- frp
- stirrup
- winding
- resin
- concrete structure
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- 238000004804 winding Methods 0.000 title claims abstract description 66
- 239000004567 concrete Substances 0.000 title claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 29
- 239000011347 resin Substances 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 229920005749 polyurethane resin Polymers 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 229920002748 Basalt fiber Polymers 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 239000004760 aramid Substances 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 239000012779 reinforcing material Substances 0.000 claims description 2
- -1 stitch-bonded felt Substances 0.000 claims description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 239000005007 epoxy-phenolic resin Substances 0.000 claims 1
- 239000000945 filler Substances 0.000 claims 1
- 229920000728 polyester Polymers 0.000 claims 1
- 229920006305 unsaturated polyester Polymers 0.000 claims 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims 1
- 229920002554 vinyl polymer Polymers 0.000 claims 1
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 63
- 239000011151 fibre-reinforced plastic Substances 0.000 description 63
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000009739 binding Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005490 dry winding Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004046 wet winding Methods 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a winding forming FRP combined stirrup concrete structure, which is characterized in that: the fiber winding device comprises FRP winding wires, wherein the FRP winding wires are single-strand FRP immersed resin fiber winding wires, can be used with various resins, and has the fiber content of more than 65 percent; the novel closed FRP stirrup is prepared by utilizing a mechanical and automatic winding process, and can be integrally wound, tensioned and formed. The winding parameters of the FRP stirrup are controllable, the inner side fiber is not curled, the FRP stirrup can be cut into a closed FRP stirrup with a specified width-to-thickness ratio after winding, curing and demoulding, and the FRP stirrup can be divided into a circular closed FRP stirrup, a square closed FRP stirrup and the like according to the form. Compared with the traditional stirrup, the invention has higher strength, corrosion resistance and durability. In addition, the preparation process greatly reduces the preparation flow and the cost.
Description
Technical Field
The invention relates to the field of composite material structures, in particular to a high-strength, corrosion-resistant and electromagnetic-insulation composite material stirrup member which can be used as a reinforcing material of a concrete member and is particularly suitable for severe service environments such as exposure, corrosiveness and the like.
Background
For reinforced concrete beam and column components, the stirrups are positioned at the outer edge of the cross section of the component, and after the protective layer concrete cracks, the stirrups are firstly adversely affected by aggressive media to cause structural failure. Meanwhile, the corrosion of the stirrup can further cause the corrosion of the longitudinal bar, so that the structure gradually loses the durability. Due to the special molding material of the FRP stirrup, compared with the traditional iron stirrup, the FRP stirrup can greatly improve the corrosion resistance and the service life, and reduces the structural maintenance and repair cost. The existing FRP stirrups are mainly produced through a pultrusion process, are in a non-closed structure with most U-shaped and L-shaped shapes, at least one side lap joint part exists, constraint efficiency is low, after the protective layer concrete falls off, the lap joint part is extremely easy to generate bonding slip damage, and the structure cannot fully exert the strength of the composite material. The novel closed FRP stirrup prepared in a continuous winding mode has the advantages that the shape is closed, no lap joint section exists, the bonding slip damage of the existing stirrup can not occur, the fiber curling phenomenon of the common pultrusion FRP stirrup at the bending section can be remarkably relieved, and the tensile strength of the bending section of the stirrup is greatly improved. The novel closed FRP stirrup is formed by gluing fiber yarns and resin materials according to a specific proportion, the impregnating resin adopts thermosetting resin matrixes such as epoxy resin or polyurethane resin and the like, no styrene volatilizes, the production pollution is reduced from the source, the steel consumption is reduced, and precious building resources are saved.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-strength, corrosion-resistant and electromagnetic-insulation closed FRP stirrup and a constraint concrete structure thereof.
A winding shaping FRP makes up stirrup concrete structure which characterized in that: the Fiber Reinforced Plastic (FRP) winding wires are single-strand FRP-impregnated resin fiber winding wires; the single-strand FRP-infiltrated resin fiber winding wire can be integrally wound and formed at a large angle and a variable angle.
Preferably, the single-strand FRP-impregnated resin fiber winding filaments are resin-impregnated pultruded sheets or resin-impregnated fiber yarns, and the fibers adopt at least one of monoaxial, biaxial or multiaxial carbon fibers, glass fibers, basalt fibers, aramid fibers or hybrid fibers.
Preferably, the impregnating resin may be one of thermosetting resin substrates such as epoxy resin, phenolic resin, polyurethane resin, etc., and unsaturated polyester resin is most preferred.
Preferably, the closed FRP stirrup can be prepared by adopting a dry, wet or semi-dry winding forming process, and the closed FRP stirrup is optimally formed by adopting the wet winding forming process.
Preferably, the closed FRP stirrup is prepared by large-angle winding or variable-angle integrated winding, and the winding angle is optimal from 80 degrees to 90 degrees.
The beneficial effects are that:
(1) The invention provides a winding forming FRP combined stirrup concrete structure, which is formed by winding single-strand FRP immersed resin fiber winding wires into a whole, compared with the traditional pultrusion process, and greatly improves the ductility and transverse strength of the finished product.
(2) Compared with the iron stirrups with the same strength, the weight of the stirrups can be reduced by 40-60%, carbon emission in the transportation process can be reduced, the on-site construction operation is facilitated, and meanwhile important building resources such as steel are saved.
(3) Compared with the prior pultrusion FRP stirrups, the FRP stirrups have the advantages that the existence of a lap joint section is avoided, the shear strength, the tensile strength and the constraint efficiency of the stirrups are greatly improved, and the strength and the performance of core concrete are fully utilized.
(4) The raw materials of the resin are formed by gluing fiber yarns and resin materials according to a specific proportion, and the resin adopts an epoxy or polyurethane resin matrix, so that styrene volatilization is avoided, and environmental pollution is reduced.
(5) The FRP closed stirrup disclosed by the invention adopts mechanized or automatic integrated production, and needs few operators, and has low labor cost and high winding speed; through automated control, the reliability is high, and the yields is high.
Drawings
FIG. 1 is a schematic view of a circular closed FRP stirrup of the present invention;
FIG. 2 is a schematic view of a square closed FRP stirrup of the present invention;
FIG. 3 is a schematic diagram of a process for winding the stirrup according to the present invention;
FIG. 4 is a schematic diagram of a finished product prepared by large-angle continuous winding of single-strand FRP-infiltrated resin fiber winding filaments;
FIG. 5 is a schematic diagram of a finished product prepared by winding single-strand FRP-infiltrated resin fiber winding filaments at large angle and intervals;
FIG. 6 is a schematic view of cutting a finished product of the round closed FRP stirrup winding of the present invention;
FIG. 7 is a schematic diagram of cutting a square closed FRP stirrup wrapped finished product of the invention;
FIGS. 8-10 are schematic illustrations of stirrup combinations of different shapes and aspect ratios of the present invention;
fig. 11-17 are schematic diagrams of application examples of the present invention.
In the figure: 1 of circular stirrup, 2 of square stirrup, 3 of digit control machine tool cutterbar, 4 of thin steel wire, sensor 5.
Detailed Description
The invention is further described with reference to the drawings and detailed description which follow:
example 1
As shown in figures 1-2, the invention is a novel closed FRP stirrup, and the basic form is a round closed FRP stirrup 1 or a square closed FRP stirrup 2 with a specified width-to-thickness ratio.
Example 2
As shown in FIG. 3, the invention relates to a novel closed FRP stirrup, and the preparation device of the novel closed FRP stirrup consists of a wire shaft bracket, a separator, a resin groove, a guide rail, a mold and a rotary core mold. The winding forming process is adopted for forming, and the preparation process is as follows:
(1) The required mould is customized according to the size and shape of the required stirrup.
(2) Adding an unsaturated resin matrix into the dipping tank, leading out FRP fiber yarns from the creel, putting the FRP fiber yarns into the dipping tank, and fully soaking the FRP winding yarns. And winding the FRP winding wires after gum dipping layer by taking the steel pipe as a core mold, and circularly or transversely rotating the core mold to adjust the thickness and the structural strength of a finished product.
(3) And after the winding is completed, cutting off FRP winding wires, heating and curing the finished product, and putting the finished product on a demoulding machine for demoulding, so that the cured finished product and the mould are separated from each other.
(4) And (3) placing the demoulded finished product on a numerical control machine tool, and cutting the finished product into the closed FRP stirrup with the circular or square section with the specified width-to-thickness ratio.
In the preparation process, a large-angle continuous winding mode can be adopted, as shown in fig. 4, the length of a core mold is 2000mm, the pipe diameter is 300mm, the wall thickness is 8mm,2mm of single-strand FRP (fiber reinforced plastic) impregnating resin fiber winding wires are continuously wound in a unidirectional mode along the length direction, the winding angle is +85 DEG, and the winding layers of stirrup finished products with the thicknesses of 2, 3, 4, 5, 6 and 8mm are 5, 7, 9, 12, 15 and 20 layers respectively, so that integral winding is formed to prepare FRP finished products; the large-angle interval winding mode can also be adopted, as shown in fig. 5, the length of the core mold is 2000mm, the pipe diameter is 300mm, the wall thickness is 8mm,2mm of single-strand FRP (fiber reinforced Plastic) impregnating resin fiber winding wires are wound unidirectionally along the length direction, the winding angle is +85 DEG, after 300mm of continuous unidirectional winding, the interval is 400mm, the winding wires are wound in the next round, and the winding layers of FRP stirrup finished products with the thicknesses of 2, 3, 4, 5, 6 and 8mm are 5, 7, 9, 12, 15 and 20 layers respectively. And cutting off the winding wires connected among the winding finished products after winding is completed, and forming a plurality of FRP stirrup finished products by winding.
In the preparation process, the types and the quantity of the fibers of the single-strand FRP-impregnated resin fiber winding wires, the types of the resins, the winding angles and the layer numbers of the winding wires and the width-to-thickness ratio of the cut finished product can be flexibly adjusted according to the needs.
Example 3
As shown in fig. 6-7, the invention is a novel closed FRP stirrup, an integral FRP stirrup finished product formed by large-angle continuous winding or an FRP stirrup finished product formed by interval winding is solidified at high temperature, then released from a die and cut by using a numerical control machine cutter 3, and finally the FRP stirrup with the required width is formed. The finished product prepared by the circular section mandrel can be cut according to the specified stirrup width of 30mm to form the circular closed FRP stirrup 1. The finished product prepared by the square section mandrel can be cut according to the specified stirrup width of 30mm to form the square closed FRP stirrup 2.
Example 4
As shown in fig. 8-10, the present invention is a novel closed FRP stirrup, which can be combined into various configurations by different shapes of FRP stirrups: as shown in fig. 8, the square-shaped FRP outer stirrup 2 surrounds a cross-shaped FRP inner stirrup, the inner stirrup comprises two identical square-shaped FRP stirrups 2 stacked in a cross shape and bound by a thin steel wire 4, and the width of the outer stirrup is twice that of the inner stirrup; as shown in fig. 9, a square FRP outer stirrup 2 surrounds a round FRP inner stirrup 1, which is bound by a thin steel wire 4, and the thickness of the inner stirrup is slightly larger than that of the outer stirrup; as shown in fig. 10, the square FRP outer stirrup 2 surrounds the square FRP inner stirrup 2, which is bound by the thin steel wire 4, and the thickness of the inner stirrup is slightly larger than that of the outer stirrup. The multi-shape constraint FRP stirrup configuration is formed by combining stirrups with different width-thickness ratios and shapes so as to improve constraint capacity.
Example 5
As shown in fig. 11, the novel closed FRP stirrup is used in a concrete circular structural column, the longitudinal stirrups are steel bars or FRP stirrups, the constraint positions and the number of the closed stirrups are determined according to structural design requirements, the circular stirrups are sleeved into the longitudinal stirrups, the stirrups and the longitudinal stirrups are fixed in a binding, welding or prefabricating mode and the like, a reinforcement cage is formed, concrete is poured to completely cover the reinforcement cage, and a specific construction method can be selected according to engineering practical conditions and construction requirements.
Example 6
As shown in fig. 12-15, the novel closed FRP stirrup is used in a concrete spandrel girder, the longitudinal bars are steel bars or FRP bars, square closed FRP stirrups can be adopted according to structural design requirements, constraint angles can be flexibly adjusted from 45 degrees to 90 degrees as required, or the stirrups are sleeved into the longitudinal bars by adopting a combined stirrup configuration in embodiment 5, the stirrups and the longitudinal bars are fixed in a binding, welding or prefabrication mode and the like, a steel bar cage is formed, concrete is poured to completely cover the steel bar cage, and a specific construction method can be selected according to practical engineering conditions and construction requirements.
Example 7
As shown in figures 16-17, the novel closed FRP stirrup is used in a concrete spandrel girder and a structural column, and a sensor 5 can be additionally arranged on the surface of the stirrup during construction operation so as to monitor the change condition of casting concrete in the curing process in real time, and corresponding measures are taken in time when necessary to ensure the normal hardening and strength development of the girder and the column.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the spirit and scope of the invention.
Claims (8)
1. Novel seal FRP stirrup, its characterized in that: the winding wires are single-strand FRP-infiltrated resin fiber winding wires; the single FRP soaked resin fiber yarn can be integrally wound, tensioned and formed, and the finished product is solidified, demoulded and cut into stirrups with specified width-to-thickness ratios.
2. The wrapped-formed FRP composite stirrup concrete structure as set forth in claim 1, characterized in that: the stirrup preparation material consists of a matrix material (unsaturated polyester, epoxy resin, polyurethane resin matrix), a reinforcing material (glass fiber, stitch-bonded felt, composite felt, continuous felt, polyester surface felt, composite surface felt) and an auxiliary material (release agent, curing agent, low shrinkage additive and filler).
3. The wrapped-formed FRP composite stirrup concrete structure as set forth in claim 1, characterized in that: the single-strand FRP-infiltrated resin fiber winding filaments are pultruded sheets or fiber yarns, and the fibers are one of monoaxial, biaxial or multiaxial carbon fibers, glass fibers, basalt fibers, aramid fibers or hybrid fibers.
4. The wrapped-formed FRP composite stirrup concrete structure as set forth in claim 1, characterized in that: the demoulding finished product can be cut according to actual requirements to form closed FRP stirrups with different width-thickness ratios, and the FRP stirrups with different shapes and width-thickness ratios can be combined according to requirements.
5. A wrap-formed FRP composite stirrup concrete structure as set forth in claim 3, characterized in that: the closed FRP stirrup preparation device consists of a wire shaft bracket, a separator, a resin groove, a guide rail, a mold, a rotary core mold, a curing heating furnace, a demoulding machine and the like. And preparing core dies with different cross-sectional shapes such as square, round or polygonal shapes and the like so as to obtain FRP stirrup finished products with different shapes and specifications.
6. A wrap-formed FRP composite stirrup concrete structure as set forth in claim 3, characterized in that: the resin adopts thermosetting resins such as unsaturated polyester resin, vinyl resin, epoxy resin, phenolic resin and the like.
7. The wrapped-formed FRP composite stirrup concrete structure as set forth in claim 1, characterized in that: the FRP stirrup is integrally wound and formed, and a large-angle winding mode is adopted, or the winding angle is gradually changed from inside to outside, so that the winding angle can be flexibly controlled according to the requirement.
8. The wrapped-formed FRP composite stirrup concrete structure as set forth in claim 6, characterized in that: the stirrup winding forming mode can adopt dry method, wet method or semi-dry method winding forming, and the winding process can be alternately performed in a circumferential winding and transverse winding mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311060801.2A CN117721955A (en) | 2023-08-22 | 2023-08-22 | Winding forming FRP combined stirrup concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311060801.2A CN117721955A (en) | 2023-08-22 | 2023-08-22 | Winding forming FRP combined stirrup concrete structure |
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| Publication Number | Publication Date |
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| CN117721955A true CN117721955A (en) | 2024-03-19 |
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|---|---|---|---|
| CN202311060801.2A Pending CN117721955A (en) | 2023-08-22 | 2023-08-22 | Winding forming FRP combined stirrup concrete structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020016662A (en) * | 2000-08-26 | 2002-03-06 | 이성우 | Rope Type Composite Bar to Replace Tie and Spiral Reinforcing Bar and Stirrup |
| CN107366388A (en) * | 2017-07-26 | 2017-11-21 | 哈尔滨工业大学 | A kind of closed square-section FRP stirrups and preparation method thereof |
| CN111113941A (en) * | 2019-12-26 | 2020-05-08 | 北京工业大学 | FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof |
| CN111186150A (en) * | 2020-03-06 | 2020-05-22 | 南京工业大学 | Composite material combined column with pultruded profile as core material |
| CN111677187A (en) * | 2020-05-19 | 2020-09-18 | 东莞理工学院 | Composite longitudinal bar-winding grid stirrup reinforced concrete beam and preparation method thereof |
-
2023
- 2023-08-22 CN CN202311060801.2A patent/CN117721955A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020016662A (en) * | 2000-08-26 | 2002-03-06 | 이성우 | Rope Type Composite Bar to Replace Tie and Spiral Reinforcing Bar and Stirrup |
| CN107366388A (en) * | 2017-07-26 | 2017-11-21 | 哈尔滨工业大学 | A kind of closed square-section FRP stirrups and preparation method thereof |
| CN111113941A (en) * | 2019-12-26 | 2020-05-08 | 北京工业大学 | FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof |
| CN111186150A (en) * | 2020-03-06 | 2020-05-22 | 南京工业大学 | Composite material combined column with pultruded profile as core material |
| CN111677187A (en) * | 2020-05-19 | 2020-09-18 | 东莞理工学院 | Composite longitudinal bar-winding grid stirrup reinforced concrete beam and preparation method thereof |
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