CN109457991B - Method for embedding reinforced concrete structure on surface layer of anchored carbon fiber - Google Patents
Method for embedding reinforced concrete structure on surface layer of anchored carbon fiber Download PDFInfo
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- CN109457991B CN109457991B CN201811265703.1A CN201811265703A CN109457991B CN 109457991 B CN109457991 B CN 109457991B CN 201811265703 A CN201811265703 A CN 201811265703A CN 109457991 B CN109457991 B CN 109457991B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0244—Increasing or restoring the load-bearing capacity of building construction elements of beams at places of holes, e.g. drilled in them
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- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method for embedding and pasting a reinforced concrete structure on the surface layer of anchored carbon fiber and application thereof. Grooving and perforating the tension side of the beam; soaking the cut carbon fiber cloth by using epoxy resin glue, and then folding the carbon fiber cloth in half for three times along the width direction; filling the holes with prepared epoxy resin glue and smearing epoxy resin on the inner surface of the groove; bending the iron wire into a U shape, folding the manufactured carbon fiber bar at the anchoring position, placing the folded position at the position of the punched hole of the beam, slowly pressing the carbon fiber bar into the hole by using the iron wire, performing the same operation on the hole at the other side, pressing the carbon fiber bar to the bottom of the hole, and slowly pulling out the iron wire; after the installation is finished, epoxy resin glue is poured into the groove to the height just capable of covering the surface of the carbon fiber bar, and the curing of the glue is waited. The invention adds an anchoring system which is easy to install by a simple method, so that the tensile strength of the CFRP can be fully exerted, and the usage amount of epoxy resin glue in the groove is reduced.
Description
Technical Field
The invention relates to a method for embedding and pasting a reinforced concrete structure on the surface layer of anchored carbon fiber and application thereof, belonging to the technical field of building construction.
Background
The research of the carbon fiber material for reinforcing and repairing the concrete structure starts in developed countries such as the American and Japanese 80 s, and the technology of China starts late. In 1997, the research on reinforcing concrete members by CFRP was first developed by the national research center for industrial building diagnosis and engineering modification, and a certain research result was obtained. Since then, a large number of theoretical analyses and experimental studies have been conducted by domestic experts.
The carbon fiber reinforcement technology has many advantages, good technical economic benefits, social benefits and environmental benefits, and is widely applied to buildings, tunnels, bridges, culverts and underground structural engineering along with the continuous reduction of material cost in recent years. In China, the carbon fiber reinforced structure is researched and started late, is mainly applied to seismic fortification, reinforcement and reinforcement of structures, concrete strength reinforcement, reinforcement insufficient for arrangement of reinforcement, structural ductility reinforcement and the like, is applied to places such as Beijing, Shanghai, Tianjin, Jiangsu, Fujian, Sichuan and the like, for example, the Beijing national culture palace cannot meet the requirements of seismic safety and use because most of the structures, and has good effect of seismic fortification and modification by pasting carbon fiber cloth.
At present, the method for reinforcing the concrete structure by using the carbon fiber in China is mainly an EB (electron beam) technology:
external bound, abbreviated EB: and (3) an external sticking and reinforcing method. The method is adopted by Chinese standards, and has the advantages of simple construction steps and easy installation. But the defect is that the external pasting process adopted by the method is easy to cause the peeling damage of the CFRP, and the tensile strength of the CFRP is difficult to be fully exerted, and only about 40% -50% of the tensile strength can be exerted.
Near Surface mount, NSM for short: the construction steps of the method are as follows: the method comprises the steps of firstly slotting on concrete according to a designed position, then carrying out cleaning pretreatment on the inside of the slot, then embedding carbon fiber reinforcements into the slot, and finally filling the slot with epoxy resin glue to form a new complex body for reinforcing the structure. But this reinforcement method cannot guarantee full exertion of the tensile strength of CFRP due to the non-anchoring system.
Disclosure of Invention
In view of the above, the invention provides a method for embedding and adhering a reinforced concrete structure on the surface layer of anchored carbon fiber and application thereof, wherein an anchoring system which is easy to install is added by a simple method, so that the tensile strength of CFRP can be fully exerted, and the use amount of epoxy resin adhesive in a groove is greatly reduced by using the anchoring system.
The invention solves the technical problems by the following technical means:
the invention relates to a method for embedding and pasting a reinforced concrete structure on the surface layer of anchored carbon fiber, which comprises the following steps:
(1) grooving and perforating on the tension side of the beam, and cleaning dust on the surface of the beam and in the hole by using an air compressor;
(2) preparing carbon fiber ribs, soaking the cut carbon fiber cloth for 3 minutes by using epoxy resin glue to ensure full soaking, then scraping redundant glue, and then carrying out three-time folding on the carbon fiber cloth along the width direction, wherein after each folding, bubbles are repeatedly compacted and removed to ensure that the carbon fiber cloth is tightly attached;
(3) blending epoxy resin adhesive by
The volume ratio of the S epoxy resin adhesive to the A adhesive to the B adhesive is100: 42, stirring for five minutes by using a stirrer at the rotating speed of 400-600RPM, uniformly mixing the AB glue, filling the holes with the prepared epoxy resin glue, and smearing the epoxy resin on the inner surface of the groove;
(4) cutting a section of iron wire, bending the iron wire into a U shape, aligning the middle point of the manufactured carbon fiber rib with the middle point of the groove, slowly pressing the carbon fiber rib into the hole by using the iron wire, simultaneously carrying out the same operation on the hole on the other side, tensioning the carbon fiber rib by the operation to ensure that the carbon fiber rib is in a straight line, pressing the carbon fiber rib to the bottom of the hole, and slowly pulling out the iron wire;
(5) and after the installation is finished, filling epoxy resin glue into the groove to a height just capable of covering the surface of the carbon fiber bar, and then placing the installed beam in a clean environment to wait for the solidification of the glue, wherein the glue solidification time is 1-2 weeks.
And (5) pouring epoxy resin glue into the groove to a height just capable of covering the surface of the carbon fiber bar.
The application of the anchoring carbon fiber surface layer embedded reinforced concrete structure is applied to the reinforcement of beams, plates and columns of industrial or civil buildings, bridges, tunnels and culverts.
The EB method has the defects that the external pasting process adopted by the method is easy to cause the peeling damage of the CFRP, and the tensile strength of the CFRP is difficult to be fully exerted, and only about 40% -50% of the tensile strength can be exerted. Compared with EB technology, the invention can fully exert the tensile strength of the material, so that the CFRP reinforced material is broken and destroyed; compared with the NSM technology, the invention firstly adds the reliable anchoring system to achieve the purpose of fully exerting the tensile strength of the CFRP, and simultaneously effectively reduces the using amount of the epoxy resin adhesive due to the use of the anchoring system, thereby reducing the material cost and facilitating the construction.
The invention has the beneficial effects that:
1. the invention adds an anchoring system which is easy to install by a simple method, so that the tensile strength of the CFRP can be fully exerted.
2. The use amount of epoxy resin glue in the tank is greatly reduced by using the anchoring system.
The application prospect of the invention is as follows:
the EB technology is generally applied to China, and is adopted for reinforcement if carbon fiber reinforcement is carried out in a new hundred markets of Nanjing in 2017; the NSM technology is applied more abroad, for example; in 1999, in a wharf repair plan developed by the Hueneme harbor navy engineering service center, California, the NSM technology is adopted for two projects, and a hogging moment area and a positive bending moment area of a reinforced concrete deck are reinforced respectively.
The invention can replace EB and NSM technology in many practical applications, and because the invention can give full play to the tensile strength of the carbon fiber cloth compared with the two technologies, the invention has higher reliability for the reinforced building; compared with the NSM technology, the invention reduces the usage amount of the epoxy resin glue and is more economical. Therefore, the invention has wide application prospect.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 shows sample dimensions for a single slot in the tensile side of a beam according to example 1 of the present invention.
Fig. 2 is a structural diagram of a main stressed member for manufacturing a carbon fiber reinforced system in embodiment 1 of the present invention.
Fig. 3 is a schematic view of beam surface pretreatment according to example 1 of the present invention.
Fig. 4 is an installation schematic diagram of embodiment 1 of the present invention.
Fig. 5 shows the results of the failure test of the installed beam in example 1 of the present invention.
Fig. 6 is a result of a failure test for reinforcing a concrete beam using EB technique in example 1 of the present invention.
Fig. 7 shows the results of the failure test performed on the reinforced concrete beam using the NSM technique in example 1 of the present invention.
Detailed Description
The invention will be described in detail with reference to the accompanying drawings, and the method for embedding a reinforced concrete structure on an anchoring carbon fiber surface layer of the embodiment comprises the following steps:
(1) grooving and perforating on the tension side of the beam, and cleaning dust on the surface of the beam and in the hole by using an air compressor;
(2) preparing carbon fiber ribs, soaking the cut carbon fiber cloth for 3 minutes by using epoxy resin glue to ensure full soaking, then scraping redundant glue, and then carrying out three-time folding on the carbon fiber cloth along the width direction, wherein after each folding, bubbles are repeatedly compacted and removed to ensure that the carbon fiber cloth is tightly attached;
(3) blending epoxy resin adhesive by
The volume ratio of the S epoxy resin adhesive to the A adhesive to the B adhesive is 100: 42, stirring for five minutes by using a stirrer at the rotating speed of 400-600RPM, uniformly mixing the AB glue, filling the holes with the prepared epoxy resin glue, and smearing the epoxy resin on the inner surface of the groove;
(4) cutting a section of iron wire, bending the iron wire into a U shape, aligning the middle point of the manufactured carbon fiber rib with the middle point of the groove, slowly pressing the carbon fiber rib into the hole by using the iron wire, simultaneously carrying out the same operation on the hole on the other side, tensioning the carbon fiber rib by the operation to ensure that the carbon fiber rib is in a straight line, pressing the carbon fiber rib to the bottom of the hole, and slowly pulling out the iron wire;
(5) and after the installation is finished, filling epoxy resin glue into the groove to a height just capable of covering the surface of the carbon fiber bar, and then placing the installed beam in a clean environment to wait for the solidification of the glue, wherein the glue solidification time is 1-2 weeks.
And (5) pouring epoxy resin glue into the groove to a height just capable of covering the surface of the carbon fiber bar.
The application of the anchoring carbon fiber surface layer embedded reinforced concrete structure is applied to the reinforcement of beams, plates and columns of industrial or civil buildings, bridges, tunnels and culverts.
Example 1
As shown in fig. 1, grooving and grooving are carried out on the tension side of the beam, the hole depth being 84mm and the groove depth being 16 mm. And cleaning dust on the surface and in the hole of the beam by using an air compressor.
As shown in FIG. 2, the carbon fiber cloth used in the test had a size of 948mm by 127 mm. Soaking the cut carbon fiber cloth for 3 minutes by using epoxy resin glue to ensure full soaking, then scraping redundant glue, and then carrying out folding on the carbon fiber cloth for three times along the width direction, wherein after each folding, the carbon fiber cloth needs to be repeatedly compacted to expel air bubbles to ensure that the carbon fiber cloth is tightly attached.
As shown in fig. 3, the holes are filled with a prepared epoxy glue and the interior surfaces of the grooves are smeared with epoxy.
Tailor one section iron wire, buckle the iron wire for the U-shaped, carry out the fifty percent discount with the carbon fiber muscle that makes in experimental design anchor department, put the hole department that the roof beam has been beaten with the fifty percent discount department, use the iron wire to slowly press the carbon fiber muscle into the hole, simultaneously, the opposite side hole also carries out the same operation, can make the carbon fiber muscle taut in order to guarantee to become a straight line through this operation. And pressing the fiber ribs to the bottom of the hole, and slowly pulling out the iron wire.
As shown in fig. 4, after the installation, epoxy resin glue is poured into the groove to a height (half of the groove depth) which can just cover the surface of the carbon fiber bar, and then the installed beam is placed in a clean environment to wait for the solidification of the glue.
The beam installed in this example 1 was subjected to a failure test with a reinforced concrete beam using EB technique and a reinforced concrete beam using NSM technique, and the results are shown in fig. 5, 6, and 7. FIG. 5 is a laboratory result using the present invention, wherein the average bearing capacity can reach 78kN, the highest bearing capacity is 84kN, and the stress level exerted by the fiber cloth is 128% on average and 140% at the highest by calculation; fig. 6 is a laboratory result of EB technique, which shows that the average bearing capacity can reach 41kN, the highest bearing capacity is 44kN, and the stress level exerted by the fiber cloth is 58% on average and 62% at the highest by calculation; fig. 7 shows the laboratory results of NSM technology, which can reach an average load bearing capacity of 51kN and a maximum load bearing capacity of 58kN, and the calculated stress level exerted by the fiber cloth is 81% on average and 94% at the maximum. Compared with EB and NSM technologies, the high-strength tensile strength of the fiber cloth can be effectively utilized, and the tensile strength can be fully exerted.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (1)
1. A method for embedding and pasting a reinforced concrete structure on an anchoring carbon fiber surface layer is characterized by comprising the following steps:
(1) grooving and perforating on the tension side of the beam, and cleaning dust on the surface of the beam and in the hole by using an air compressor;
(2) preparing carbon fiber ribs, soaking the cut carbon fiber cloth for 3 minutes by using epoxy resin glue to ensure full soaking, then scraping redundant glue, and then carrying out three-time folding on the carbon fiber cloth along the width direction, wherein after each folding, bubbles are repeatedly compacted and removed to ensure that the carbon fiber cloth is tightly attached;
(3) blending epoxy resin adhesive by
The volume ratio of the S epoxy resin adhesive to the A adhesive to the B adhesive is 100: 42, stirring for five minutes by using a stirrer at the rotating speed of 400-600RPM, uniformly mixing the AB glue, filling the holes with the prepared epoxy resin glue, and smearing the epoxy resin on the inner surface of the groove;
(4) cutting a section of iron wire, bending the iron wire into a U shape, aligning the middle point of the manufactured carbon fiber rib with the middle point of the groove, slowly pressing the carbon fiber rib into the hole by using the iron wire, simultaneously carrying out the same operation on the hole on the other side, tensioning the carbon fiber rib by the operation to ensure that the carbon fiber rib is in a straight line, pressing the carbon fiber rib to the bottom of the hole, and slowly pulling out the iron wire;
(5) after the installation is finished, filling epoxy resin glue into the groove to a height which can just cover the surface of the carbon fiber bar, and then placing the installed beam in a clean environment to wait for the solidification of the glue, wherein the glue solidification time is 1-2 weeks; pouring epoxy resin glue into the groove to a height just capable of covering the surface of the carbon fiber bar; it is applied to the reinforcement of beams, plates and columns of industrial or civil buildings, bridges, tunnels and culverts.
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| CN201811265703.1A CN109457991B (en) | 2018-10-30 | 2018-10-30 | Method for embedding reinforced concrete structure on surface layer of anchored carbon fiber |
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| CN201811265703.1A CN109457991B (en) | 2018-10-30 | 2018-10-30 | Method for embedding reinforced concrete structure on surface layer of anchored carbon fiber |
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| CN109457991A CN109457991A (en) | 2019-03-12 |
| CN109457991B true CN109457991B (en) | 2021-10-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110725219A (en) * | 2019-10-17 | 2020-01-24 | 北京房修一建筑工程有限公司 | Motor vehicle bridge reinforcing process |
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| CN101691817A (en) * | 2009-09-14 | 2010-04-07 | 华东交通大学 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
| CN101696589A (en) * | 2009-10-13 | 2010-04-21 | 华侨大学 | Novel combined stone beam |
| CN201460025U (en) * | 2009-07-02 | 2010-05-12 | 广厦建设集团有限责任公司 | Concrete member embedded with FRP slat or rib on surface layer |
| CN102425311A (en) * | 2011-09-05 | 2012-04-25 | 长沙理工大学 | Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) |
| CN204060021U (en) * | 2014-08-19 | 2014-12-31 | 沈阳建筑大学 | The concrete beam that a kind of FRP plate is reinforced |
| CN105952180A (en) * | 2016-05-31 | 2016-09-21 | 广东工业大学 | Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method |
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2018
- 2018-10-30 CN CN201811265703.1A patent/CN109457991B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201460025U (en) * | 2009-07-02 | 2010-05-12 | 广厦建设集团有限责任公司 | Concrete member embedded with FRP slat or rib on surface layer |
| CN101691817A (en) * | 2009-09-14 | 2010-04-07 | 华东交通大学 | Method for additionally anchoring reinforced concrete beam strengthened with FRP cloth material in anti-bending way |
| CN101696589A (en) * | 2009-10-13 | 2010-04-21 | 华侨大学 | Novel combined stone beam |
| CN102425311A (en) * | 2011-09-05 | 2012-04-25 | 长沙理工大学 | Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) |
| CN102425311B (en) * | 2011-09-05 | 2015-02-25 | 长沙理工大学 | Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer) |
| CN204060021U (en) * | 2014-08-19 | 2014-12-31 | 沈阳建筑大学 | The concrete beam that a kind of FRP plate is reinforced |
| CN105952180A (en) * | 2016-05-31 | 2016-09-21 | 广东工业大学 | Method for reinforcing concrete structure through embedded wet and sticky FRP strips and component of method |
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