CN113073790B - Mechanical anchoring method for FRP (fiber reinforced Plastic) section bar in FRP reinforced concrete composite structure - Google Patents
Mechanical anchoring method for FRP (fiber reinforced Plastic) section bar in FRP reinforced concrete composite structure Download PDFInfo
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- CN113073790B CN113073790B CN202110372918.9A CN202110372918A CN113073790B CN 113073790 B CN113073790 B CN 113073790B CN 202110372918 A CN202110372918 A CN 202110372918A CN 113073790 B CN113073790 B CN 113073790B
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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
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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
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
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Abstract
The invention discloses a mechanical anchoring method of FRP (fiber reinforced plastic) sections in an FRP reinforced concrete composite structure, which comprises the following steps: cleaning the surface of an anchoring area of the FRP sectional material, forming bolt holes at bolt connecting positions according to design, and uniformly coating epoxy resin on the anchoring area after removing dust; taking two steel bearing plates, forming bolt holes in bolt positions according to design, and performing roughening treatment on one surfaces of the two steel bearing plates respectively; bonding the rough surfaces of the two steel pressure bearing plates with the FRP profile by using epoxy resin, aligning the openings of the two steel pressure bearing plates with the openings of the FRP profile, and punching and fixing by using high-strength bolts; and curing according to the curing time specified by the adopted epoxy resin adhesive, applying pretightening force to the high-strength bolt after curing is finished, and mechanically anchoring the processed FRP section to be used for pouring the FRP reinforced concrete composite structure.
Description
Technical Field
The invention relates to the technical field of building structure engineering, in particular to a mechanical anchoring method of an FRP (fiber reinforced plastic) section bar in an FRP reinforced concrete composite structure.
Background
The FRP profile takes epoxy resin as a matrix and high-strength fiber as a reinforcing material, is processed into a profile through a specific process, has the characteristics of high strength, corrosion resistance, fatigue resistance, designability and the like, and has wide application in the field of building structural engineering (such as patent technology with the publication number of CN 108863184A). In concrete structure engineering, one of the reasons for hindering the application of FRP profiles is that the FRP profiles have smooth surfaces and poor adhesion with concrete, resulting in low cooperative deformability with concrete structures. Because the FRP section bar can not adopt a welding mode to increase mechanical anchoring, the FRP section bar still adopts a mode such as hole opening or bolt anchoring. Because the FRP section bar is frequently sheared and damaged by the extrusion of concrete or bolt rods in the holes, the strength utilization rate of the section bar plate is low.
In summary, the existing FRP section anchoring method in the field of concrete structures still has the disadvantages of low anchoring efficiency, no guarantee of quality and the like, so that a new anchoring method in the FRP section-reinforced concrete composite structure is needed.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for anchoring an FRP section-reinforced concrete structure with a bolt and a steel plate, which has high anchoring strength, in view of the defects of the method for anchoring an FRP section in concrete in the prior art.
In order to realize the purpose, the invention adopts the technical scheme that:
a mechanical anchoring method of FRP profiles in an FRP reinforced concrete composite structure comprises the following steps:
(1) Cleaning the surface of an anchoring area of the FRP sectional material, forming bolt holes at bolt connecting positions according to design, and uniformly coating epoxy resin on the anchoring area after removing dust;
(2) Taking two steel pressure bearing plates, forming bolt holes in bolt positions according to design, and performing roughening treatment on one surfaces of the two steel pressure bearing plates respectively;
(3) Bonding the rough surfaces of the two steel pressure bearing plates with the FRP profile by using epoxy resin, aligning the openings of the two steel pressure bearing plates with the openings of the FRP profile, and punching and fixing by using high-strength bolts;
(4) And curing according to the curing time specified by the adopted epoxy resin adhesive, applying pretightening force to the high-strength bolt after curing is finished, and mechanically anchoring the processed FRP section to be used for pouring the FRP reinforced concrete composite structure. In the FRP reinforced concrete composite structure formed by the method, the clamped steel bearing plate and the high-strength bolt are firmly integrated with the FRP section bar through bonding and friction, and the high-strength bolt and the nut protrude out of the surface of the steel bearing plate to form a mechanical anchoring body of the FRP section bar in concrete.
The invention realizes the common stress of the anchoring and the FRP section plate by adopting the combined action of the friction between the steel bearing plate and the FRP section and the bonding of the epoxy resin impregnating adhesive, so that the FRP section can be reliably anchored in a concrete structure. The anchoring measure of the invention is simple, rapid, convenient and reliable in construction, the anchoring method can be used for realizing the connection of FRP sectional materials in a concrete structure, and the anchoring method can be used for various FRP sectional material-reinforced concrete composite structures.
In the invention, the mechanical anchoring method can be manufactured and installed by adopting a scattered mode, an integral mode or a combination of the two modes;
the distributed type adopts a single high-strength bolt to fix two smaller steel bearing plates on the FRP profile, and the FRP profile is anchored by the distributed combination of a plurality of single anchors in an anchoring area;
the integral type steel bearing plate covering the whole anchoring area is fixed on the FRP sectional material by adopting a plurality of high-strength bolts to realize the anchoring of the FRP sectional material.
In the step (1):
the FRP section comprises all section members made of FRP, including FRP I-shaped sections, L-shaped sections and pipes;
the thickness of the FRP section is determined by design, and the shape and the size of the anchoring area of the FRP section are determined by design. The method for manufacturing the rough gluing surface of the steel plate comprises surface sand blasting and shot blasting.
In the step (1), the thickness of the coated epoxy resin adhesive layer is controlled within 1.0mm, and iron sand or silica sand is doped into the epoxy resin, so that the bonding and friction effects are better.
In the step (2), the roughening treatment of the contact surface of the steel pressure bearing plate and the FRP section comprises surface sand blasting, shot blasting and grooving.
In the step (3), the diameter of the high-strength bolt is determined by design, and the pressure of the steel bearing plate on the FRP profile plate is controlled in a mode of applying bolt pretightening force in the installation process; the high-strength bolt spacing is determined by design.
As a general inventive concept, the invention also provides an FRP (fiber reinforced plastic) section with mechanical anchoring, which comprises two steel bearing plates and the FRP section positioned between the two steel bearing plates, wherein the contact surfaces of the two steel bearing plates and the FRP section are both rough surfaces after treatment, epoxy resin is coated on the contact surfaces for bonding, the two steel bearing plates are connected through high-strength bolts after the resin is hardened, and pretightening force is applied to tightly press the steel bearing plates on the two surfaces of the FRP section. In the FRP reinforced concrete composite structure formed by the method, the clamping steel plate and the bolt are firmly integrated with the FRP section bar into a whole through bonding and friction, and the bolt and the nut protrude out of the surface of the steel plate to form a mechanical anchoring body of the FRP section bar in concrete
The FRP section with mechanical anchoring is preferably manufactured by the mechanical anchoring method of the present invention.
Compared with the prior art, the invention has the main advantages that:
1. the invention realizes the common stress of the anchoring and the FRP section plate by adopting the combined action of the friction between the steel bearing plate and the FRP section and the bonding of the epoxy resin impregnating adhesive, has the advantages of high strength and high anchoring efficiency, and ensures that the FRP section can realize the cooperative deformation with a concrete structure.
2. The anchoring method is simple in construction, fast and efficient, can be expanded to connection of FRP profiles in concrete structures by utilizing the anchoring method, and can be widely applied to various concrete building structures.
Drawings
FIG. 1 is a schematic front view of an integrated mechanical anchoring process;
FIG. 2 is a left side schematic view of the integrated mechanical anchoring process;
FIG. 3 is a schematic front view of a distributed mechanical anchoring method;
FIG. 4 is a left side schematic view of a distributed mechanical anchoring process;
FIG. 5 is a sectional view of the bolt steel plate anchoring;
in the figure:
1-concrete;
2-FRP profile;
3-steel bearing plate;
4-high strength bolts;
5-epoxy resin adhesive;
6-integral mechanical anchoring;
7-distributed mechanical anchoring.
Detailed Description
The invention is further described with reference to the following drawings and specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
As shown in fig. 1 and 2, in the integral mechanical anchoring method, a plurality of high-strength bolts 4 are used for fixing a steel bearing plate 3 covering the whole anchoring area on an FRP section 2, so that the FRP section is anchored in concrete 1.
As shown in fig. 3 and 4, the distributed mechanical anchoring method adopts a single high-strength bolt 4 to fix two smaller steel pressure bearing plates 3 on the FRP section 2, and realizes the anchoring of the FRP section by the distributed combination of a plurality of single anchors in the anchoring area.
The mechanical anchoring method for the FRP section in the FRP reinforced concrete composite structure is suitable for the integral type, the scattered type or the combination of the integral type and the scattered type, and specifically comprises the following steps:
1) FRP profile plate treatment
Forming bolt holes in the anchoring area of the FRP section bar 2 according to design; and dust is removed, an anchoring area is cleaned, the resin bonding effect is prevented from being influenced, and the device is reserved.
2) Steel bearing plate treatment
Manufacturing a rough surface on one surface of the steel pressure bearing plate 3 by adopting a surface sand blasting, shot blasting or grooving mode; according to design, a bolt hole is formed in the steel pressure bearing plate 3, and the size of the bolt hole is the same as that in the step 1); and cleaning the steel plate to avoid the influence of mechanical grease on the bonding of the epoxy resin adhesive 5.
3) Anchoring assembly and maintenance
Uniformly coating an anchoring area of the FRP section plate 2 with an epoxy resin adhesive 5, controlling the thickness of the FRP section plate below 1.0mm, and preferably doping iron sand or silica sand; the rough surfaces of the two steel pressure bearing plates 3 are tightly attached to the rough surface of the anchoring area of the FRP section plate 2 in a mode corresponding to the bolt holes, the high-strength bolts 4 are inserted into the bolt holes, the nuts are screwed up, the steel plate is attached to the FRP plate, and redundant epoxy resin adhesives 5 are extruded out; curing according to the adopted standard curing time of the epoxy resin adhesive 5; after maintenance is finished, the nut is screwed to the designed pretightening force, the bolt steel plate anchoring manufacturing of the invention is finished, and as shown in fig. 5, the bolt steel plate anchoring manufacturing method can be used for pouring concrete 1 of an FRP section bar-reinforced concrete composite structure.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.
Claims (4)
1. The application of the mechanical anchoring method of the FRP profile in the pouring forming of the FRP reinforced concrete composite structure is characterized in that the mechanical anchoring method of the FRP profile comprises the following steps:
(1) Cleaning the surface of an anchoring area of the FRP profile, forming bolt holes at bolt connecting positions according to design, uniformly coating epoxy resin in the anchoring area after removing dust, and doping iron sand or silica sand into the epoxy resin;
the FRP sectional material is an FRP I-shaped sectional material, an L-shaped sectional material or a pipe;
(2) Taking two steel bearing plates, forming bolt holes in bolt positions according to design, and performing roughening treatment on one surfaces of the two steel bearing plates respectively;
(3) Bonding the rough surfaces of the two steel pressure bearing plates with the FRP profile by using epoxy resin, aligning the openings of the two steel pressure bearing plates with the openings of the FRP profile, and punching and fixing by using high-strength bolts;
(4) Curing is carried out according to curing time specified by the adopted epoxy resin adhesive, after the curing is finished, pretightening force is applied to the high-strength bolt, and the processed FRP section is mechanically anchored and can be used for pouring the FRP reinforced concrete composite structure; in the FRP reinforced concrete composite structure formed by the method, the clamped steel bearing plate and the high-strength bolt are firmly integrated with the FRP section bar through bonding and friction, and the high-strength bolt and the nut protrude out of the surface of the steel bearing plate to form a mechanical anchoring body of the FRP section bar in concrete.
2. The use according to claim 1, characterized in that the mechanical anchoring method is made and installed in a distributed manner, in a monolithic manner or in a combination of both methods;
the distributed type adopts a single high-strength bolt to fix two smaller steel bearing plates on the FRP profile;
the integral type steel bearing plate covering the whole anchoring area is fixed on the FRP sectional material by adopting a plurality of high-strength bolts to realize the anchoring of the FRP sectional material.
3. The use according to claim 1, wherein in step (1), the thickness of the applied epoxy adhesive layer is controlled to be within 1.0 mm.
4. The application of claim 1, wherein in the step (2), the roughening treatment of the contact surface of the steel pressure bearing plate and the FRP profile comprises surface sand blasting, shot blasting and grooving.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372918.9A CN113073790B (en) | 2021-04-07 | 2021-04-07 | Mechanical anchoring method for FRP (fiber reinforced Plastic) section bar in FRP reinforced concrete composite structure |
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|---|---|---|---|
| CN202110372918.9A CN113073790B (en) | 2021-04-07 | 2021-04-07 | Mechanical anchoring method for FRP (fiber reinforced Plastic) section bar in FRP reinforced concrete composite structure |
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| CN113073790B true CN113073790B (en) | 2022-12-09 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201143A (en) * | 2015-10-16 | 2015-12-30 | 沈阳建筑大学 | Carbon fiber thin-wall steel tube concrete composite column with internal FRP sectional material and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101477005B (en) * | 2009-01-09 | 2010-12-01 | 同济大学 | Specimen end clipping reinforcement method during FRP rib stress relaxation characteristics test |
| CN102235095B (en) * | 2010-04-30 | 2013-03-27 | 卓清 | Preparation method of fiber reinforced polymer sheet |
| US9010047B2 (en) * | 2011-07-05 | 2015-04-21 | City University Of Hong Kong | Construction structure and method of making thereof |
| CN102561412A (en) * | 2012-02-07 | 2012-07-11 | 山东大学 | Reinforcement method for fiber reinforced composite plastic and concrete |
| CN105781143A (en) * | 2016-04-29 | 2016-07-20 | 华北水利水电大学 | Device and method for reinforcing concrete shear wall by FRP (fiber reinforced plastics) |
| CN109881842B (en) * | 2019-03-08 | 2021-09-17 | 北京工业大学 | FRP sheet becomes clamping-force ripples clamp plate anchor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105201143A (en) * | 2015-10-16 | 2015-12-30 | 沈阳建筑大学 | Carbon fiber thin-wall steel tube concrete composite column with internal FRP sectional material and method |
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