CN108797898B - Composite connector for FRP rib and assembling method thereof - Google Patents
Composite connector for FRP rib and assembling method thereof Download PDFInfo
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- CN108797898B CN108797898B CN201810897524.3A CN201810897524A CN108797898B CN 108797898 B CN108797898 B CN 108797898B CN 201810897524 A CN201810897524 A CN 201810897524A CN 108797898 B CN108797898 B CN 108797898B
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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
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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Abstract
The invention discloses a composite connector for FRP ribs and an assembling method thereof, comprising the following steps: the steel sleeve is provided with inner wall threads on the inner wall; fiber cloth is wound on the outer wall of the steel sleeve; the steel sleeve is provided with a plurality of bolt holes leading to the inner wall; hexagonal head bolts are connected in the plurality of bolt holes in a matching way; wherein, two sections of FRP ribs are placed in the steel sleeve, and the two sections of FRP ribs are fixed by tightening the hexagon head bolts; arc-shaped soft metal gaskets are annularly stuck to the positions of the two FRP ribs, which are positioned on the bolt holes; stainless steel plugs can be detached from two ends of the steel sleeve; adhesive glue is poured between the inner wall of the steel sleeve and the FRP rib. The connector has the advantages of simple structure, reasonable design and convenient implementation, and can be widely applied to engineering; the invention fills glue in the steel sleeve to bond the rib material and the steel sleeve, and uses bolts to anchor outside the sleeve, so that the bonding between the connector and the rib material is firmer, and the invention is more beneficial to the connection of the rib material.
Description
Technical Field
The invention belongs to the field of civil engineering FRP rib concrete structures, and particularly relates to a composite connector for FRP ribs and an assembly method thereof.
Background
Fiber reinforced composites (FRP) have the advantages of high tensile strength, light weight, corrosion resistance, thermal expansion coefficient close to that of concrete, and the like, have been widely accepted and applied in the civil engineering field since the advent of the world, and are becoming research hot spots in the field. The FRP rib is produced by pultrusion of fiber reinforced unsaturated polyester, epoxy resin, phenolic resin and other matrix materials, and has thermosetting property. Because the molecular structure of the thermosetting matrix material is easy to decompose when heated, and the FRP rib has low shear strength and brittle quality, the thermosetting FRP rib is easy to shear and concentrate stress after being bent, and the shape of the thermosetting FRP rib cannot be changed at will after being formed. Because of the limitation of transportation and production conditions, the lengths of the reinforcing steel bars and the FRP bars produced from factories are limited, the lengths of the bars required in practical engineering are often very long, and the practical conditions of the engineering site are very complex, so that the FRP bars inevitably encounter connection problems in use. Conventional joining methods for steel materials are as follows: the welding and mechanical connection are not applicable to FRP ribs. Therefore, the FRP rib has a bottleneck in processing and manufacturing various finished products required by construction, and a device for connecting the FRP rib is needed to further play the value of the FRP. The development of a safe, economical and practical connection system is a precondition for researching the FRP rib concrete structure, and is one of keys for pushing the FRP rib to the market and applying the FRP rib to the actual structure.
Disclosure of Invention
It is an object of the present invention to address at least the above problems and/or disadvantages and to provide at least the advantages described below.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a composite connector for FRP tendons, comprising:
the steel sleeve is provided with inner wall threads on the inner wall; fiber cloth is wound on the outer wall of the steel sleeve; the steel sleeve is provided with a plurality of bolt holes leading to the inner wall; hexagonal head bolts are connected in the plurality of bolt holes in a matching way;
wherein, two sections of FRP ribs are placed in the steel sleeve, and the two sections of FRP ribs are fixed by tightening the hexagon head bolts; arc-shaped soft metal gaskets are annularly stuck to the positions of the two FRP ribs, which are positioned on the bolt holes; stainless steel plugs can be detached from two ends of the steel sleeve; adhesive glue is poured between the inner wall of the steel sleeve and the FRP rib.
Preferably, the fiber cloth is any one of bidirectional carbon fiber cloth, aramid fiber cloth, high-strength glass fiber cloth and basalt fiber cloth.
Preferably, the fiber cloth is of a multi-layer fiber cloth structure, and the multi-layer fiber cloth structure is sequentially formed by a bidirectional carbon fiber cloth, an aramid fiber cloth, a basalt fiber cloth and a bidirectional carbon fiber cloth from inside to outside; epoxy resin glue is coated between each layer of fiber cloth of the multi-layer fiber cloth structure.
Preferably, the thickness of the bidirectional carbon fiber cloth is 0.12-0.15 mm, the thickness of the aramid fiber cloth is 0.18-0.22 mm, and the thickness of the basalt fiber cloth is 0.15-0.18 mm.
Preferably, a bolt washer is sleeved on the hexagon head bolt; the stainless steel plug is sleeved with a plug gasket.
Preferably, the included angle of the steel sleeve may be set to any one of 30 °, 45 °, 60 °, 90 °, 120 °, 135 °, 150 °, and 180 °.
Preferably, the fiber reinforced plastic composite material also comprises a plurality of pre-tightening sleeves, wherein the inner walls of the pre-tightening sleeves are uniformly sleeved on the FRP ribs after being coated with epoxy resin glue; the plurality of pre-tightening sleeves are elastic rubber sleeves; the outer surfaces of the pre-tightening sleeves are provided with a plurality of circles of convex edges.
The invention also provides an assembling method of the composite connector for the FRP rib, which comprises the following steps:
step one, extending the contact part of the FRP rib and the hexagon head bolt to a certain length to be annularly attached with an arc-shaped soft metal gasket;
step two, after the arc-shaped soft metal gasket is tightly adhered, inserting two sections of FRP ribs from two ports of the steel sleeve respectively, and rotating the FRP ribs to adjust the position of the arc-shaped soft metal gasket; the end parts of the two sections of FRP ribs are positioned in the middle of the steel sleeve, so that the insertion lengths of the two sections of FRP ribs are consistent; a hexagon head bolt sleeved with a bolt washer is screwed on each bolt hole at two ends to fix the rib material to prevent the rib material from sliding;
step three, sleeving a plug gasket on the stainless steel plugs, enabling the two stainless steel plugs to penetrate through the two FRP ribs respectively, and screwing the stainless steel plugs to enable the stainless steel plugs to be tightly connected with the steel sleeve; and plugging gaps at two stainless steel plugs;
step four, injecting adhesive from the bolt hole until the adhesive is full;
step five, sequentially screwing hexagon head bolts and bolt gaskets at the rest bolt holes, and sequentially and gradually screwing;
and step six, wiping off redundant adhesive, and standing and curing in an environment of about 25 ℃ to obtain the composite connector for the FRP rib.
Preferably, in the second step, after the arc-shaped soft metal gasket is tightly adhered, a plurality of pre-tightening sleeves are uniformly sleeved on the FRP rib; the plurality of pre-tightening sleeves are elastic rubber sleeves; the outer surfaces of the pre-tightening sleeves are provided with a plurality of circles of convex edges.
Preferably, in the fourth step, the preparation method of the adhesive glue comprises the following steps: adding 30-40 parts of epoxy resin, 20-25 parts of aminopropyl triethoxysilane and 0.3-0.8 part of triethylamine in a supercritical device according to parts by weight, introducing carbon dioxide to 25-40 MPa and stirring for 1-2 hours at 50-60 ℃ after the device is sealed, then releasing pressure, taking 20-25 parts of reaction products and 5-10 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide, placing the reaction products and 5-10 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide in a sealed container with stirring, introducing nitrogen to saturate the nitrogen, and then placing the sealed container in an electron accelerator with 1.5MeV and 30mA for irradiation stirring treatment to obtain modified epoxy resin; the irradiation adopts the irradiation dose rate of 100-200 kGy/h, the irradiation dose of 200-500 kGy and the stirring speed of 100-200 r/min;
50 to 70 parts of modified epoxy resin, 10 to 30 parts of phenolic resin, 5 to 8 parts of polyethylene polyamine, 5 to 10 parts of esterified starch, 2 to 5 parts of allyl glycidyl ether, 3 to 5 parts of tertiary amine, 3 to 5 parts of folic acid, 1 to 5 parts of 1-ethyl-3-methylimidazole lactic acid, 1 to 3 parts of dibutyltin dilaurate, 1 to 3 parts of polyamide and 0.3 to 0.5 part of graphene oxide are mixed and stirred for 30 to 60 minutes at the temperature of 80 to 100 ℃ to obtain the adhesive glue.
The invention at least comprises the following beneficial effects: the invention solves the problems that FRP ribs cannot be bent due to the material characteristics of the FRP ribs and are required to be bent in practical application. When the connector is produced in a large scale, the steel sleeve has good plasticity and low material requirement, and can be produced according to actual requirements. The connector has the advantages of simple structure, reasonable design and convenient implementation, and can be widely applied to engineering; the connector disclosed by the invention has the advantages that the glue screw is used for simultaneously acting, glue is filled in the steel sleeve to bond the rib material and the steel sleeve, and the bolt is used for anchoring outside the sleeve, so that the bonding between the connector and the rib material is firmer, the connection of the rib material is more favorable, the prepared bonding glue has excellent performance, and the ultimate strength of the connector can be obviously improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a longitudinal cross-sectional view of a connector of the present invention;
FIG. 2 is a top view of the connector of the present invention;
FIG. 3 is a cross-sectional view of an untwisted stainless steel plug of the connector of the present invention;
FIG. 4 is a cross-sectional view B-B of FIG. 1;
FIG. 5 is a cross-sectional view A-A of FIG. 1;
FIG. 6 is a longitudinal cross-sectional view of a stainless steel plug of the present invention;
FIG. 7 is a left side view of a stainless steel plug of the present invention;
FIG. 8 is a right side view of a stainless steel plug of the present invention;
FIG. 9 is a schematic view of the structure of a plug gasket of the present invention;
FIG. 10 is a schematic view of the construction of a plurality of pretensioning sleeves according to the present invention.
The specific embodiment is as follows:
the present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Fig. 1 to 9 show a composite connector for FRP tendons according to the present invention, including:
a steel sleeve 2, the inner wall of which is provided with an inner wall thread 3; the outer wall of the steel sleeve 2 is wound with a fiber cloth 1; the steel sleeve 2 is provided with a plurality of bolt holes 11 leading to the inner wall; a plurality of bolt holes 11 are internally matched and connected with hexagon head bolts 4;
wherein, two sections of FRP ribs 8 are placed in the steel sleeve 2, and the two sections of FRP ribs 8 are fixed by tightening the hexagon head bolt 4; arc-shaped soft metal gaskets 7 are annularly attached to the positions, located at the bolt holes 11, of the two FRP ribs 8; stainless steel plugs 9 can be detached from two ends of the steel sleeve 2; adhesive 6 is poured between the inner wall of the steel sleeve 2 and the FRP rib 8.
In the technical scheme, the connector is firmly bonded with the rib material under the action of the bolt and the adhesive, so that the connection of the rib material is more beneficial, and the purpose of annularly attaching the arc-shaped soft metal gasket is to prevent the hexagon head bolt from locally extruding and damaging the surface of the FRP rib material in the screwing process; the fiber cloth is stuck on the outer wall of the steel sleeve, so that the steel can be protected and corrosion can be prevented; a row of hexagon bolts are arranged along the axial direction of the steel sleeve, and the hexagon bolt rods form convex ribs when extruding FRP rib materials, so that the integral sliding of the adhesive layer can be effectively reduced, and the problem of centering the rib materials is solved; the inner wall threads are arranged on the inner wall of the steel sleeve to enlarge the bonding area with the FRP rib and form a meshed interface; the connector can effectively solve the problem that FRP ribs need to be connected when in engineering application, and further improves the application of the FRP ribs in engineering.
In the above technical scheme, the fiber cloth is any one of bidirectional carbon fiber cloth, aramid fiber cloth, high-strength glass fiber cloth and basalt fiber cloth.
In the technical scheme, the fiber cloth is of a multi-layer fiber cloth structure, and the multi-layer fiber cloth structure is sequentially formed by two-way carbon fiber cloth, aramid fiber cloth, basalt fiber cloth and two-way carbon fiber cloth from inside to outside; epoxy resin glue is coated between each layer of fiber cloth of the multi-layer fiber cloth structure; by adopting the mode, the structure of the multi-layer fiber cloth can better play a role in protecting steel materials and preventing corrosion, and the ultimate strength of the connector can be improved.
In the technical scheme, the thickness of the bidirectional carbon fiber cloth is 0.12-0.15 mm, the thickness of the aramid fiber cloth is 0.18-0.22 mm, and the thickness of the basalt fiber cloth is 0.15-0.18 mm, and by adopting the mode, the effects of protecting steel materials and preventing corrosion can be better achieved, and the ultimate strength of the connector can be improved.
In the technical scheme, the hexagonal head bolt 4 is sleeved with the bolt washer 5; a plug gasket 10 is sleeved on the stainless steel plug 9; the stainless steel plug and the hexagon head bolt can be matched with the gasket when being screwed up, so that the fiber cloth can be prevented from being peeled off.
In the above technical solution, the included angle of the steel sleeve may be set to any one of 30 °, 45 °, 60 °, 90 °, 120 °, 135 °, 150 °, and 180 °.
In another embodiment, as shown in fig. 10, a plurality of pretensioning sleeves 12, the inner wall of the steel wire is uniformly sleeved on the FRP rib 8 after being coated with epoxy resin glue and positioned between the adjacent arc-shaped soft metal gaskets; the plurality of pretension sleeves 12 are elastic rubber sleeves; the outer surfaces of the pretensioning jackets 12 are provided with a plurality of rings of ribs 13. By adopting the mode, the contact bonding area of the FRP rib and the bonding glue can be increased, and a meshed interface is formed, so that the bonding glue is more reliable.
Example 1:
the assembling method of the composite connector for the FRP rib comprises the following steps of:
step one, extending the contact part of the FRP rib and the hexagon head bolt to a certain length to be annularly attached with an arc-shaped soft metal gasket;
step two, after the arc-shaped soft metal gasket is tightly adhered, inserting two sections of FRP ribs from two ports of the steel sleeve respectively, and rotating the FRP ribs to adjust the position of the arc-shaped soft metal gasket; the end parts of the two sections of FRP ribs are positioned in the middle of the steel sleeve, so that the insertion lengths of the two sections of FRP ribs are consistent; a hexagon head bolt sleeved with a bolt washer is screwed on each bolt hole at two ends to fix the rib material to prevent the rib material from sliding;
step three, sleeving a plug gasket on the stainless steel plugs, enabling the two stainless steel plugs to penetrate through the two FRP ribs respectively, and screwing the stainless steel plugs to enable the stainless steel plugs to be tightly connected with the steel sleeve; and plugging gaps at two stainless steel plugs;
step four, injecting adhesive from the bolt hole until the adhesive is full; the adhesive glue is common epoxy resin glue sold in the market;
step five, sequentially screwing hexagon head bolts and bolt gaskets at the rest bolt holes, and sequentially and gradually screwing;
and step six, wiping off redundant adhesive, and standing and curing in an environment of about 25 ℃ to obtain the composite connector for the FRP rib.
Example 2:
the assembling method of the composite connector for the FRP rib comprises the following steps of:
step one, extending the contact part of the FRP rib and the hexagon head bolt to a certain length to be annularly attached with an arc-shaped soft metal gasket;
step two, after the arc-shaped soft metal gaskets are tightly adhered, uniformly sleeving the inner walls of the pre-tightening sleeves on the FRP ribs after coating epoxy resin glue; inserting two sections of FRP ribs from two ports of the steel sleeve respectively, and rotating the FRP ribs to adjust the positions of the arc-shaped soft metal gaskets; the end parts of the two sections of FRP ribs are positioned in the middle of the steel sleeve, so that the insertion lengths of the two sections of FRP ribs are consistent; a hexagon head bolt sleeved with a bolt washer is screwed on each bolt hole at two ends to fix the rib material to prevent the rib material from sliding; the plurality of pre-tightening sleeves are elastic rubber sleeves; a plurality of rings of convex ribs are arranged on the outer surfaces of the pre-tightening sleeves;
step three, sleeving a plug gasket on the stainless steel plugs, enabling the two stainless steel plugs to penetrate through the two FRP ribs respectively, and screwing the stainless steel plugs to enable the stainless steel plugs to be tightly connected with the steel sleeve; and plugging gaps at two stainless steel plugs;
step four, injecting adhesive from the bolt hole until the adhesive is full; the adhesive glue is common epoxy resin glue sold in the market;
step five, sequentially screwing hexagon head bolts and bolt gaskets at the rest bolt holes, and sequentially and gradually screwing;
and step six, wiping off redundant adhesive, and standing and curing in an environment of about 25 ℃ to obtain the composite connector for the FRP rib.
Example 3:
the assembling method of the composite connector for the FRP rib comprises the following steps of:
step one, extending the contact part of the FRP rib and the hexagon head bolt to a certain length to be annularly attached with an arc-shaped soft metal gasket;
step two, after the arc-shaped soft metal gasket is tightly adhered, inserting two sections of FRP ribs from two ports of the steel sleeve respectively, and rotating the FRP ribs to adjust the position of the arc-shaped soft metal gasket; the end parts of the two sections of FRP ribs are positioned in the middle of the steel sleeve, so that the insertion lengths of the two sections of FRP ribs are consistent; a hexagon head bolt sleeved with a bolt washer is screwed on each bolt hole at two ends to fix the rib material to prevent the rib material from sliding;
step three, sleeving a plug gasket on the stainless steel plugs, enabling the two stainless steel plugs to penetrate through the two FRP ribs respectively, and screwing the stainless steel plugs to enable the stainless steel plugs to be tightly connected with the steel sleeve; and plugging gaps at two stainless steel plugs;
step four, injecting adhesive from the bolt hole until the adhesive is full;
step five, sequentially screwing hexagon head bolts and bolt gaskets at the rest bolt holes, and sequentially and gradually screwing;
step six, wiping off redundant adhesive, and standing and curing in an environment of about 25 ℃ to obtain the composite connector for the FRP rib;
in the fourth step, the preparation method of the adhesive glue comprises the following steps: adding 40 parts of epoxy resin, 25 parts of aminopropyl triethoxysilane and 0.8 part of triethylamine in a supercritical device according to parts by weight, introducing carbon dioxide to 40MPa after the device is sealed, stirring for 2 hours at the temperature of 60 ℃, then releasing pressure, taking 20 parts of reaction products and 10 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide, placing the reaction products and 10 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide in a stirred sealed container, introducing nitrogen to saturate the nitrogen, and then placing the sealed container in an electron accelerator of 1.5MeV and 30mA for irradiation stirring treatment to obtain modified epoxy resin; the irradiation dose rate adopted by the irradiation is 200kGy/h, the irradiation dose is 500kGy, and the stirring speed is 200r/min;
70 parts of modified epoxy resin, 30 parts of phenolic resin, 8 parts of polyethylene polyamine, 10 parts of esterified starch, 2 parts of allyl glycidyl ether, 3 parts of tertiary amine, 3 parts of folic acid, 1 part of 1-ethyl-3-methylimidazole lactic acid, 3 parts of dibutyltin dilaurate, 3 parts of polyamide and 0.5 part of graphene oxide are mixed, and then stirred at 80 ℃ for 60 minutes to obtain the adhesive.
Example 4:
the assembling method of the composite connector for the FRP rib comprises the following steps of:
step one, extending the contact part of the FRP rib and the hexagon head bolt to a certain length to be annularly attached with an arc-shaped soft metal gasket;
step two, after the arc-shaped soft metal gasket is tightly adhered, inserting two sections of FRP ribs from two ports of the steel sleeve respectively, and rotating the FRP ribs to adjust the position of the arc-shaped soft metal gasket; the end parts of the two sections of FRP ribs are positioned in the middle of the steel sleeve, so that the insertion lengths of the two sections of FRP ribs are consistent; a hexagon head bolt sleeved with a bolt washer is screwed on each bolt hole at two ends to fix the rib material to prevent the rib material from sliding;
step three, sleeving a plug gasket on the stainless steel plugs, enabling the two stainless steel plugs to penetrate through the two FRP ribs respectively, and screwing the stainless steel plugs to enable the stainless steel plugs to be tightly connected with the steel sleeve; and plugging gaps at two stainless steel plugs;
step four, injecting adhesive from the bolt hole until the adhesive is full;
step five, sequentially screwing hexagon head bolts and bolt gaskets at the rest bolt holes, and sequentially and gradually screwing;
step six, wiping off redundant adhesive, and standing and curing in an environment of about 25 ℃ to obtain the composite connector for the FRP rib;
in the fourth step, the preparation method of the adhesive glue comprises the following steps: adding 30 parts of epoxy resin, 20 parts of aminopropyl triethoxysilane and 0.5 part of triethylamine in a supercritical device according to parts by weight, introducing carbon dioxide to 30MPa after the device is sealed, stirring for 1 hour at the temperature of 60 ℃, then releasing pressure, taking 25 parts of reaction products and 5 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide, placing the reaction products and 5 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide in a stirred sealed container, introducing nitrogen to saturate the nitrogen, and then placing the sealed container in an electron accelerator of 1.5MeV and 30mA for irradiation stirring treatment to obtain modified epoxy resin; the irradiation dose rate adopted by the irradiation is 100kGy/h, the irradiation dose is 200kGy, and the stirring speed is 200r/min;
50 parts of modified epoxy resin, 10 parts of phenolic resin, 5 parts of polyethylene polyamine, 5 parts of esterified starch, 5 parts of allyl glycidyl ether, 5 parts of tertiary amine, 3 parts of folic acid, 3 parts of 1-ethyl-3-methylimidazole lactic acid, 2 parts of dibutyltin dilaurate, 2 parts of polyamide and 0.5 part of graphene oxide are mixed, and stirred at 100 ℃ for 45 minutes to obtain the adhesive.
The FRP bars used in the above examples 1 to 4 have a diameter of 12mm, a theoretical tensile strength of about 900MPa and a theoretical limit load of about 102KN; in examples 1 to 4, a drawing test was performed in which the length of one side anchoring (the length of a single FRP rib in a steel sleeve in two FRP ribs) was 20 times the diameter of the rib (i.e., 240 mm); test equipment: WAW-600 microcomputer controlled electrohydraulic servo universal tester produced by Shanghai Hualong test instruments Co., ltd; test reference specification: the loading rate of the fiber reinforced composite material rib GB/T26743-2011 for structural engineering is controlled to be between 100MPa and 500MPa of stress increase per minute, and the stress is converted into force and 0.3KN/s is taken; the limit load is divided into the theoretical limit load of the tendon (which is an inherent property of the tendon) and the actual measured limit load in the test, which should be close if the test is normal. The criterion for judging whether the actual limit load is more than 95% of the ideal limit load is effective, and the actual limit load is not destroyed near the connecting end part.
Table 1 shows the results of the drawing test using the single-side anchoring length of 20 times the tendon diameter (i.e., 240 mm) in examples 1 to 4;
TABLE 1
In the invention, 3 groups of comparison tests are adopted, a traditional common cylindrical steel sleeve (without a bolt anchoring structure, FRP ribs are directly inserted into the cylindrical steel sleeve, then the bottom end head is plugged, glue is filled from the other end along the gap between the FRP ribs and the cylindrical steel sleeve, and the connector is obtained through maintenance), the bonding length is 20 times of the diameter of the ribs, namely 240mm, and as a result, the ribs are pulled out, the connector is invalid to be damaged, and the pulling load is 61.25kN, 65.24kN and 57.83kN.
The FRP bars used in the above examples 1 to 4 have a diameter of 12mm, a theoretical tensile strength of about 900MPa and a theoretical limit load of about 102KN; in examples 1 to 4, a drawing test was performed in which the length of one side anchoring (the length of a single FRP rib in a steel sleeve in two FRP ribs) was 15 times the diameter of the rib (i.e., 180 mm);
table 2 shows the results of the drawing test using the one-side anchor length of 15 times the diameter of the bar (i.e., 180 mm) in examples 1 to 4;
TABLE 2
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (3)
1. A composite connector for FRP tendons, comprising:
the steel sleeve is provided with inner wall threads on the inner wall; fiber cloth is wound on the outer wall of the steel sleeve; the steel sleeve is provided with a plurality of bolt holes leading to the inner wall; hexagonal head bolts are connected in the plurality of bolt holes in a matching way;
the inner walls of the pre-tightening sleeves are coated with epoxy resin glue and then uniformly sleeved on the FRP ribs; the plurality of pre-tightening sleeves are elastic rubber sleeves; a plurality of rings of convex ribs are arranged on the outer surfaces of the pre-tightening sleeves;
wherein, two sections of FRP ribs are placed in the steel sleeve, and the two sections of FRP ribs are fixed by tightening the hexagon head bolts; arc-shaped soft metal gaskets are annularly stuck to the positions of the two FRP ribs, which are positioned on the bolt holes; stainless steel plugs can be detached from two ends of the steel sleeve; adhesive glue is poured between the inner wall of the steel sleeve and the FRP rib;
the fiber cloth is of a multi-layer fiber cloth structure, and the multi-layer fiber cloth structure sequentially comprises a bidirectional carbon fiber cloth, an aramid fiber cloth, a basalt fiber cloth and a bidirectional carbon fiber cloth from inside to outside; epoxy resin glue is coated between each layer of fiber cloth of the multi-layer fiber cloth structure;
the thickness of the bidirectional carbon fiber cloth is 0.12-0.15 mm, the thickness of the aramid fiber cloth is 0.18-0.22 mm, and the thickness of the basalt fiber cloth is 0.15-0.18 mm;
the hexagon head bolt is sleeved with a bolt washer; a plug gasket is sleeved on the stainless steel plug;
the included angle of the steel sleeve can be set to be any one of 30 degrees, 45 degrees, 60 degrees, 90 degrees, 120 degrees, 135 degrees, 150 degrees and 180 degrees.
2. A method of assembling a composite connector for FRP reinforcement according to claim 1, comprising the steps of:
step one, extending the contact part of the FRP rib and the hexagon head bolt to a certain length to be annularly attached with an arc-shaped soft metal gasket;
step two, after the arc-shaped soft metal gasket is tightly adhered, inserting two sections of FRP ribs from two ports of the steel sleeve respectively, and rotating the FRP ribs to adjust the position of the arc-shaped soft metal gasket; the end parts of the two sections of FRP ribs are positioned in the middle of the steel sleeve, so that the insertion lengths of the two sections of FRP ribs are consistent; a hexagon head bolt sleeved with a bolt washer is screwed on each bolt hole at two ends to fix the rib material to prevent the rib material from sliding;
step three, sleeving a plug gasket on the stainless steel plugs, enabling the two stainless steel plugs to penetrate through the two FRP ribs respectively, and screwing the stainless steel plugs to enable the stainless steel plugs to be tightly connected with the steel sleeve; and plugging gaps at two stainless steel plugs;
step four, injecting adhesive from the bolt hole until the adhesive is full;
step five, sequentially screwing hexagon head bolts and bolt gaskets at the rest bolt holes, and sequentially and gradually screwing;
step six, wiping off redundant adhesive, and standing and curing in an environment of about 25 ℃ to obtain the composite connector for the FRP rib;
in the second step, after the arc-shaped soft metal gasket is tightly adhered, uniformly sleeving a plurality of pre-tightening sleeves on the FRP rib; the plurality of pre-tightening sleeves are elastic rubber sleeves; the outer surfaces of the pre-tightening sleeves are provided with a plurality of circles of convex edges.
3. The assembling method of the composite connector for the FRP reinforcement according to claim 2, wherein in the fourth step, the adhesive is prepared by: adding 30-40 parts of epoxy resin, 20-25 parts of aminopropyl triethoxysilane and 0.3-0.8 part of triethylamine in a supercritical device according to parts by weight, introducing carbon dioxide to 25-40 MPa after sealing the device, stirring for 1-2 hours at 50-60 ℃, then releasing pressure, taking 20-25 parts of reaction products and 5-10 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide, placing the reaction products and 5-10 parts of N, N '- (4, 4' -methylenediphenyl) bismaleimide in a stirred sealed container, introducing nitrogen to saturate the nitrogen, and then placing the sealed container in an electron accelerator of 1.5MeV and 30mA for irradiation stirring treatment to obtain modified epoxy resin; the irradiation dose rate adopted by the irradiation is 100-200 kGy/h, the irradiation dose is 200-500 kGy, and the stirring speed is 100-200 r/min;
50-70 parts of modified epoxy resin, 10-30 parts of phenolic resin, 5-8 parts of polyethylene polyamine, 5-10 parts of esterified starch, 2-5 parts of allyl glycidyl ether, 3-5 parts of tertiary amine, 3-5 parts of folic acid, 1-5 parts of 1-ethyl-3-methylimidazole lactic acid, 1-3 parts of dibutyltin dilaurate, 1-3 parts of polyamide and 0.3-0.5 part of graphene oxide are mixed, and stirred for 30-60 minutes at 80-100 ℃ to obtain the adhesive.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810897524.3A CN108797898B (en) | 2018-08-08 | 2018-08-08 | Composite connector for FRP rib and assembling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810897524.3A CN108797898B (en) | 2018-08-08 | 2018-08-08 | Composite connector for FRP rib and assembling method thereof |
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| CN109680877B (en) * | 2018-12-18 | 2020-11-10 | 温州电力设计有限公司 | Half grout sleeve connection structure of assembled component |
| CN109838040A (en) * | 2019-01-11 | 2019-06-04 | 东南大学 | A kind of material muscle connector and connection method again |
| CN112814283A (en) * | 2020-12-24 | 2021-05-18 | 中交第三航务工程局有限公司江苏分公司 | Glue pouring connection structure for steel bar sleeve and construction method |
| CN112814285A (en) * | 2021-01-05 | 2021-05-18 | 同济大学 | Connecting sleeve design method, thread glue injection type steel bar connecting sleeve and installation method thereof |
| CN113338545B (en) * | 2021-06-29 | 2022-09-23 | 扬州大学 | FRP rib connecting device and connecting method thereof |
| CN114319109B (en) * | 2021-11-30 | 2024-05-10 | 中国建筑第八工程局有限公司 | Bonding type clamp for FRP (fiber reinforced Plastic) component and mounting method thereof |
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