CN111113941A - FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof - Google Patents
FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof Download PDFInfo
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- CN111113941A CN111113941A CN201911369900.2A CN201911369900A CN111113941A CN 111113941 A CN111113941 A CN 111113941A CN 201911369900 A CN201911369900 A CN 201911369900A CN 111113941 A CN111113941 A CN 111113941A
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- frp
- stirrup
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- strip
- spiral
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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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/32—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core on a rotating mould, former or core
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
Abstract
The invention discloses an FRP (fiber reinforced plastic) cross-wound spiral stirrup and a manufacturing method thereof, and relates to the technical field of building materials and building structures. The problems that an existing steel spiral stirrup is prone to corrosion and insufficient in durability, an FRP spiral stirrup is difficult to manufacture and high in cost, bending damage is prone to occurring during forming, and restraint efficiency is not high are solved. The invention includes a stirrup body. The space shape of the hoop body is a three-dimensional spiral body which is crossed with each other, and the cross section shape is a rectangle with the width far larger than the thickness. The manufacturing method of the stirrup body comprises the steps of spirally winding the FRP strip formed by fiber-impregnated resin to a specified position along one direction, reversely winding the FRP strip to the initial position, curing and demolding. The stirrup provided by the invention has the advantages of excellent performance, simplicity in manufacturing, convenience in construction and lower cost, and can be used for concrete members such as beams and columns.
Description
Technical Field
The invention relates to an FRP (fiber reinforced Plastic) cross-wound spiral stirrup and a manufacturing method thereof
Background
Currently, reinforced concrete is widely used in buildings. According to statistics, the total area of various buildings existing in China is 100 hundred million meters2In the process of long-term use of most reinforced concrete structures, steel bars in concrete are corroded under the action of various corrosive media, and finally the concrete structures lose the use function in advance under the condition that the design reference period is not reached; according to the survey at home and abroad, the primary reason for the damage of the reinforced concrete structure in the 21 st century is the corrosion of the steel bars, and is the primary factor for reducing the durability of the reinforced concrete structure, so that huge economic loss is caused to countries in the world. According to statistics, the direct economic loss caused by the corrosion of the steel bars in China is about 3000 billion yuan each year, and accounts for about 0.3 percent of the total domestic production value.
The replacement of steel bars with non-corrosive materials has become a fundamental approach to the problem of corrosion of steel bars. Compared with a reinforcing steel bar material, a Fiber Reinforced Polymer (FRP) has the advantages of high strength, light weight, fatigue resistance, corrosion resistance, strong designability and the like. Therefore, the use of FRP reinforcement as a substitute for steel reinforcement in concrete structures is a viable measure to avoid corrosion of the steel reinforcement. And the steel bar which is rusted firstly in the concrete is the outmost stirrup. After the stirrup is corroded, the restraint capacity of the concrete and the longitudinal bars is reduced, the corrosion can be transmitted to the longitudinal bars, and the structural durability is further lost, so that the durability of the concrete structure can be effectively improved by replacing the steel stirrups with the FRP stirrups.
The existing FRP stirrups are usually formed by bending a pultrusion FRP bar before resin is completely cured, so that inner side fiber kinking and outer side fiber breakage are easy to occur, the tensile strength and modulus of the FRP stirrups are reduced, and the restraint efficiency is further influenced. In addition, for the existing FRP lapped stirrups, the defect that the lapped section is easy to be damaged by bonding and sliding too early is also existed; for the existing FRP spiral stirrup, the defects of insufficient constraint efficiency, difficult manufacture and higher cost exist.
Disclosure of Invention
The invention aims to provide an FRP cross winding spiral stirrup which is corrosion resistant, high in restraint efficiency, simple to manufacture, low in cost and convenient to construct. The FRP cross-wound spiral stirrup provided by the invention realizes non-lap-joint integral reciprocating spiral winding, and solves the problem that the lap joint section of the existing FRP lap joint stirrup is damaged by premature bonding and sliding; the invention is a three-dimensional cross spiral body of a double-layer FRP strip, realizes the uniform strength of the stirrup structure in all directions, and solves the problems of non-overlapping and low constraint efficiency of the existing FRP spiral stirrup; the manufacturing method of the invention adopts full-automatic winding, has simple die, can control the winding direction and the distance of the FRP strip, and solves the problems of complex die, difficult manufacturing and high cost of the existing FRP spiral stirrup; the invention is an intercrossed three-dimensional spiral body, the stirrup body is an integral structure, the construction is convenient, and the problem of difficult construction of the existing FRP stirrup is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the FRP cross-wound stirrup comprises a stirrup body, wherein the space shape of the stirrup body is a three-dimensional spiral body which is crossed with each other, an FRP strip is spirally wound to a specified position from one end on a die and then is spirally wound to an initial position in a reverse cross way for forming, and the cross section shape of the stirrup body is a rectangle the width of which is far more than the thickness of which.
The manufacturing method of the FRP cross winding spiral stirrup comprises the following steps:
the method comprises the following steps: installing a mold: mounting a die (circular or rectangular) of a specific shape to a winding machine;
step two: molding: putting continuous fibers into a glue dipping tank filled with liquid resin for full soaking to form an FRP strip;
step three; winding: fixing one end of an FRP strip (2) at a winding starting point of a mould (4) by using a fixing device (8), starting a winding machine to rotate the mould (4), pulling the FRP strip (2) to move to a specified position on the surface of the mould (4) from one end of the mould by using a traversing device (7), then pulling the FRP strip to the starting position in a reverse direction, and fixing the FRP strip (2) at the starting position together to form a three-dimensional crossed spiral body with a certain crossed angle;
step four: and (3) curing: putting the FRP strip (2) and the mould (4) which are wound in a crossed way into a heating tank or a heating chamber integrally, and curing the FRP strip (2) on the mould (4);
step five: demolding: placing the solidified FRP strip (2) and the mould (4) on a demoulding machine for demoulding;
step six: cutting: and cutting two ends of the stripped stirrup body (1), removing the protruding parts, and forming a neat plane to obtain a final FRP cross spiral stirrup finished product.
Compared with the prior art, the invention has the following beneficial effects:
1. the FRP cross-wound spiral stirrup is mainly applied to concrete beam and column members with the cross-sectional shapes of circular or rectangular, can effectively avoid the corrosion problem of the steel stirrup in the member and improve the durability of the concrete member and the whole structure.
2. The FRP cross winding spiral stirrup is of a space cage net structure, has strong constraint capacity on concrete and longitudinal bars, and can effectively improve the compressive strength of a concrete member.
3. The cross section of the FRP cross winding spiral stirrup is an FRP strip with the width far larger than the thickness, so that fiber kinking or breakage is less during manufacturing, the tensile strength is high, and the restraint efficiency is high.
4. The FRP cross-wound spiral stirrup disclosed by the invention is wound automatically and continuously, so that the production efficiency is high and the production cost is low.
5. The FRP cross-wound spiral stirrup can be integrally placed at a designated position of a concrete mold during construction, binding work of a plurality of stirrups is omitted, and construction efficiency can be greatly improved.
Drawings
In order to more clearly and pictorially explain the technical solution of the present invention, the drawings required for the present invention will be briefly described as follows:
FIG. 1 is a process flow chart of the manufacturing method of the FRP cross-wound spiral stirrup of the invention;
FIG. 2 is a schematic view of the structure of the stirrup body (1) according to the invention when it is circular in cross section;
FIG. 3 is a schematic structural view of the stirrup body (1) according to the invention, in the shape of a rectangular section;
fig. 4 is a schematic view of a concrete reinforcing cage provided with a circular reinforcing body (1) according to an embodiment of the present invention;
fig. 5 is a schematic view of a concrete reinforcing cage provided with a rectangular stirrup body (1) according to an embodiment of the present invention;
in the figure: 1-a stirrup body; 2-FRP strip; 3-fibers; 4-molding; 5-a winding machine; 6-a glue dipping tank; 7-a traversing device; 8-a fixation device; 9-longitudinal ribs.
Detailed Description
The invention is further illustrated below with reference to two examples and figures 1 to 5.
The invention provides an FRP cross winding spiral stirrup and a manufacturing method thereof, aiming at solving the problems that the existing steel spiral stirrup is easy to rust and has insufficient durability, the FRP spiral stirrup is difficult to manufacture and has higher cost, the FRP spiral stirrup is easy to bend and damage during molding, the constraint efficiency is not high, and the like. The specific implementation steps are as follows:
the method comprises the following steps: installing a mold: mounting the mould (4) on a winding machine (5);
step two: molding: putting continuous fibers (3) into a glue dipping tank (6) filled with liquid resin to fully soak the resin and form an FRP strip (2);
step three; winding: fixing one end of an FRP strip (2) at a winding starting point of a mould (4) by using a fixing device (8), starting a winding machine to rotate the mould (4), pulling the FRP strip (2) to move to a specified position on the surface of the mould (4) from one end of the mould by using a traversing device (7), then pulling the FRP strip to the starting position in a reverse direction, and fixing the FRP strip (2) at the starting position together to form a three-dimensional crossed spiral body with a certain crossed angle;
step four: and (3) curing: putting the FRP strip (2) and the mould (4) which are wound in a crossed way into a heating tank or a heating chamber integrally, and curing the FRP strip (2) on the mould (4);
step five: demolding: and (3) placing the solidified FRP strip (2) and the mould (4) on a demoulding machine for demoulding.
Step six: cutting: and cutting two ends of the stripped stirrup body (1), removing the protruding parts, and forming a neat plane to obtain the FRP crossed spiral stirrup finished product.
Example one
The method comprises the steps of manufacturing a circular hoop body (1) as shown in fig. 3 by using a device shown in fig. 1, installing a circular mold (4) with a specific size on a winding machine, drawing continuous fibers (3) to a glue dipping tank (6) filled with liquid resin for full wetting, forming an FRP strip (2) with the thickness of 5mm and the width of 50mm by passing the fully wetted fibers (3) through a mouth groove of a traversing device (7), drawing the fully formed FRP strip (2) to one end of the circular mold, adjusting the FRP strip (2) to form a certain angle (α) with the axis of the circular mold, fixing the FRP strip (2) by using a fixing device (8), opening the winding machine to rotate the circular mold, drawing the FRP strip (2) by using the traversing device (7) to move from one end of the mold (4) to a specific position on the surface of the mold (4), drawing the FRP strip in a reverse direction to the initial position, fixing the FRP strip (2) together with the FRP strip (2) at the initial position by using the fixing device (8), forming a certain cross angle, placing the FRP strip and heating the circular mold and heating the FRP strip (2) together to heat the FRP strip (2) together to obtain a stripping film, and then placing the FRP strip (3) on the winding machine to solidify the FRP strip (2) in a stripping film, and cutting the complete cutting machine to obtain the FRP strip (FRP) and cutting the hoop body, wherein the FRP) into a hoop.
The 4 longitudinal bars are evenly and symmetrically arranged along the periphery of the circular stirrup body (1) shown in the figure 3 to obtain the reinforcement framework shown in the figure 4, and the reinforcement framework is configured in a concrete member with a circular section.
Example two
The rectangular stirrup body (1) shown in fig. 4 is manufactured by using the device shown in fig. 1, and the difference from the above example is that the circular mould arranged on the winding machine is replaced by the rectangular mould, the rectangular FRP cross-wound spiral stirrup body (1) shown in fig. 3 is obtained according to the same preparation method, 4 longitudinal bars are arranged at four corners of the rectangular stirrup body (1) shown in fig. 3, and the reinforcement framework shown in fig. 4 is obtained and is configured in a concrete member with a rectangular section.
Claims (8)
1. An FRP cross-wound spiral stirrup comprising: the space shape of the hoop body (1) is an intercrossed three-dimensional spiral body, the hoop body (1) is formed by spirally winding an FRP strip (2) formed by soaking fiber in resin to a specified position from one end and then spirally winding the FRP strip to the initial position in a reverse cross way to form, and the cross section shape of the hoop body (1) is a rectangle with the width far larger than the thickness.
2. The FRP cross-wound spiral stirrup as claimed in claim 1, wherein: the center line of the three-dimensional spiral bodies which are mutually crossed is a continuous three-dimensional crossed spiral line which is wound back and forth according to the thread pitch and forms a crossed angle.
3. The FRP cross-wound spiral stirrup as claimed in claim 1, wherein: the pitch of the spiral stirrup body is not more than 80mm or dcor/5，dcorThe diameter of the concrete core section determined by the inner surface of the stirrup is not less than 40 mm.
4. The FRP cross-wound spiral stirrup as claimed in claim 1, wherein the winding angle α of the FRP strip (2) is 45-80 °.
5. A manufacturing method of FRP cross winding spiral stirrups is characterized in that: the manufacturing method comprises the following steps:
the method comprises the following steps: installing a mold: mounting a mould (4) of a specific shape on a winding machine (5);
step two: molding: putting continuous fibers (3) into a glue dipping tank (6) filled with liquid resin to fully soak the resin and form an FRP strip (2);
step three; winding: fixing one end of an FRP strip (2) at a winding starting point of a mould (4) by using a fixing device (8), starting a winding machine to rotate the mould (4), pulling the FRP strip (2) to move to a specified position on the surface of the mould (4) from one end of the mould by using a traversing device (7), then pulling the FRP strip to the starting position in a reverse direction, and fixing the FRP strip (2) at the starting position together to form a three-dimensional crossed spiral body with a certain crossed angle;
step four: and (3) curing: putting the FRP strip (2) and the mould (4) which are wound in a crossed way into a heating tank or a heating chamber integrally, and curing the FRP strip (2) on the mould (4);
step five: demolding: placing the solidified FRP strip (2) and the mould (4) on a demoulding machine for demoulding;
step six: cutting: and cutting two ends of the stripped stirrup body (1), removing the protruding parts, and forming a neat plane to obtain a final FRP cross spiral stirrup finished product.
6. The method for manufacturing the FRP cross-wound spiral stirrup as claimed in claim 5, wherein in the third step, when the mold (4) and the FRP strip (2) are fixed, a certain angle α is formed between the mold (4) and the axis, so that the FRP cross-wound spiral stirrup is ensured after winding.
7. The method for manufacturing the FRP cross-wound spiral stirrup as claimed in claim 6, wherein α is controlled to be 45-80 °.
8. The method for manufacturing the FRP cross-wound spiral stirrup as claimed in claim 5, wherein: the transverse moving device (7) ensures that the movement process cannot be stopped, and smoothly pulls the FRP strip (2) to a specified position from one end and then reversely returns to the starting point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369900.2A CN111113941A (en) | 2019-12-26 | 2019-12-26 | FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911369900.2A CN111113941A (en) | 2019-12-26 | 2019-12-26 | FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof |
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| CN111113941A true CN111113941A (en) | 2020-05-08 |
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| CN201911369900.2A Pending CN111113941A (en) | 2019-12-26 | 2019-12-26 | FRP (fiber reinforced plastic) cross-wound spiral stirrup and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194052A (en) * | 2022-09-15 | 2022-10-18 | 定州市精锐机械科技有限公司 | Wire feeding unit, gabion mesh knitting machine and wire feeding method |
| CN116061460A (en) * | 2023-03-21 | 2023-05-05 | 北京玻钢院复合材料有限公司 | Composite material spiral member forming die and forming system |
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| CN101817227A (en) * | 2010-05-11 | 2010-09-01 | 南京锋晖复合材料有限公司 | Method for processing composite fiber material spiral stirrup |
| CN103243864A (en) * | 2013-05-28 | 2013-08-14 | 南京工业大学 | Composite stirrup |
| CN104499640A (en) * | 2014-12-30 | 2015-04-08 | 中国矿业大学 | High-durability concrete structural element and manufacture method thereof |
| CN106233059A (en) * | 2014-04-25 | 2016-12-14 | 八千代工业株式会社 | Pressure vessel and fiber winding method |
| 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 |
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2019
- 2019-12-26 CN CN201911369900.2A patent/CN111113941A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817227A (en) * | 2010-05-11 | 2010-09-01 | 南京锋晖复合材料有限公司 | Method for processing composite fiber material spiral stirrup |
| CN103243864A (en) * | 2013-05-28 | 2013-08-14 | 南京工业大学 | Composite stirrup |
| CN106233059A (en) * | 2014-04-25 | 2016-12-14 | 八千代工业株式会社 | Pressure vessel and fiber winding method |
| CN104499640A (en) * | 2014-12-30 | 2015-04-08 | 中国矿业大学 | High-durability concrete structural element and manufacture method thereof |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115194052A (en) * | 2022-09-15 | 2022-10-18 | 定州市精锐机械科技有限公司 | Wire feeding unit, gabion mesh knitting machine and wire feeding method |
| CN115194052B (en) * | 2022-09-15 | 2022-11-29 | 定州市精锐机械科技有限公司 | Wire feeding unit, gabion mesh knitting machine and wire feeding method |
| CN116061460A (en) * | 2023-03-21 | 2023-05-05 | 北京玻钢院复合材料有限公司 | Composite material spiral member forming die and forming system |
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