CN114592605A - Long-span concrete beam connected by FRP (fiber reinforced plastic) -grouting sleeve and processing method - Google Patents
Long-span concrete beam connected by FRP (fiber reinforced plastic) -grouting sleeve and processing method Download PDFInfo
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- CN114592605A CN114592605A CN202210226120.8A CN202210226120A CN114592605A CN 114592605 A CN114592605 A CN 114592605A CN 202210226120 A CN202210226120 A CN 202210226120A CN 114592605 A CN114592605 A CN 114592605A
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- 229920002430 Fibre-reinforced plastic Polymers 0.000 title claims abstract description 63
- 239000011151 fibre-reinforced plastic Substances 0.000 title claims abstract description 63
- 239000004567 concrete Substances 0.000 title claims abstract description 42
- 238000003672 processing method Methods 0.000 title description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000011440 grout Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 14
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 4
- 239000011178 precast concrete Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5831—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially rectangular form
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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
-
- 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
-
- 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
- E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
-
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention provides a long-span concrete beam connected by an FRP (fiber reinforced plastic) -grouting sleeve, which comprises a first precast beam and a second precast beam, wherein a second end of the first precast beam and a third end of the second precast beam are connected by an FRP-grouting sleeve node, the FRP-grouting sleeve node comprises a first embedded sleeve, a second embedded sleeve, a connecting sleeve, a first FRP (fiber reinforced plastic) belt and a second FRP belt, the first embedded sleeve is arranged at the second end of the first precast beam, the second embedded sleeve is arranged at the third end of the second precast beam, the connecting sleeve is positioned in the first embedded sleeve and the second embedded sleeve, and the first FRP belt and the second FRP belt are adhered at the joint of the first precast beam and the second precast beam. The invention improves the bearing capacity and the bending rigidity of the spliced joint section of the superposed beam, reduces the length of the prefabricated part, facilitates the construction and improves the construction efficiency.
Description
Technical Field
The invention relates to the technical field of prefabricated long-span concrete beams, in particular to a long-span concrete beam connected by a fiber composite reinforced material (FRP) -grouting sleeve and a processing method thereof.
Background
The building industry modernization is the development direction of the building industry, and the fabricated concrete structure is one of main structural forms popularized in the modernization process of the building industry and is also one of main structural forms of industrialized buildings. In the fabricated concrete structure, in order to improve the structural integrity, a precast beam member is often used for a frame beam, a floor beam and the like, and the precast beam can be spliced with a cast-in-place beam column node or a beam span middle position at a longitudinal beam end. The long-span concrete beam can be prefabricated in two sections generally, the connection after being transported to the site is mainly butt joint, a post-cast section is usually arranged at the joint, and the longitudinal steel bars at the lower part of the beam are connected in the post-cast section in a mechanical connection mode, a grouting sleeve connection mode or a welding mode and the like. However, the connection mode needs to take out a single template after post-pouring, the construction is complex and a large amount of manpower is consumed; the long-span concrete beam prefabricated part is generally 9-18m, has larger size and is not beneficial to transportation and storage of the part; the prefabricated section and the cast-in-place section have weaker bonding capability and are easy to generate concentrated cracks; the bearing capacity and rigidity of the beam can be reduced by splicing the post-cast strip; there is overhanging reinforcing bar in the precast concrete roof beam both ends outside for production efficiency reduces, has increased the construction degree of difficulty, and has the safety quality problem in the work progress.
Therefore, the invention provides the long-span concrete beam connected by the FRP-grouting sleeve and the processing method thereof, so as to improve the bearing capacity and the bending rigidity of the abutted seam and improve the construction efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a long-span concrete beam connected by an FRP-grouting sleeve and a processing method.
The invention provides a long-span concrete beam connected by an FRP (fiber reinforced plastic) -grouting sleeve, which comprises a first precast beam and a second precast beam, wherein the first precast beam is provided with a first end and a second end which are oppositely arranged, the second precast beam is provided with a third end and a fourth end which are oppositely arranged, the second end of the first precast beam is oppositely arranged with the third end of the second precast beam, the second end of the first precast beam and the third end of the second precast beam are connected by an FRP-grouting sleeve node, the FRP-grouting sleeve node comprises a first embedded sleeve, a second embedded sleeve, a connecting sleeve, a first FRP (fiber reinforced plastic) belt and a second FRP belt, the first embedded sleeve is arranged at the second end of the first precast beam and is vertical to the end surface of the first precast beam, the second embedded sleeve is arranged at the third end of the second precast beam and is vertical to the end surface of the second precast beam, the first pre-buried sleeve and the second pre-buried sleeve are circumferentially aligned, the connecting sleeve is located in the first pre-buried sleeve and the second pre-buried sleeve, filling materials are filled in the connecting sleeve and between the connecting sleeve and the first pre-buried sleeve and between the connecting sleeve and the second pre-buried sleeve, and the first FRP belt and the second FRP belt are adhered to the joint of the first precast beam and the second precast beam.
Further, the second FRP belt is U-shaped, and the second FRP belt is pasted along three sides of the joint of the first precast beam and the second precast beam.
Further, the first FRP belt is in a strip shape, and the first FRP belt is pasted perpendicularly to the connection position of the first precast beam and the second precast beam.
Furthermore, a first grouting hole and a first grout outlet are respectively formed in the first embedded sleeve and the second embedded sleeve, and a second grouting hole is formed in the connecting sleeve.
Furthermore, the inner side of the joint of the first embedded sleeve and the second embedded sleeve is provided with a groove, the circumferential direction of the connecting sleeve is provided with a convex key, and the convex key of the connecting sleeve is matched with the grooves of the first embedded sleeve and the second embedded sleeve.
Furthermore, a first longitudinal steel bar is arranged in the first precast beam, a second longitudinal steel bar is arranged in the second precast beam, one end of the first longitudinal steel bar extends into the connecting sleeve, and one end of the second longitudinal steel bar extends into the connecting sleeve.
Preferably, the filling materials in the connecting sleeve and between the connecting sleeve and the first embedded sleeve and between the connecting sleeve and the second embedded sleeve are high-strength micro-expansion mortar.
Preferably, the inner wall surfaces of the first embedded sleeve, the second embedded sleeve and the connecting sleeve are rough structures.
Furthermore, the first end of the first precast beam and the fourth end of the second precast beam are also provided with the embedded sleeves.
The invention also provides a processing method of the long-span concrete beam connected by the FRP-grouting sleeve, which comprises the following steps:
prefabricating the first precast beam and the second precast beam with the longitudinal steel bars and the embedded sleeves;
hoisting the first precast beam or the second precast beam in place, installing the connecting sleeve, and splicing the second precast beam or the first precast beam with the first precast beam or the second precast beam;
grouting the connecting sleeve, the first embedded sleeve and the second embedded sleeve;
and adhering the first FRP strip and the second FRP strip at the joint of the first precast beam and the second precast beam.
Compared with the prior art, the invention has the following beneficial effects:
1. the long-span concrete beam connected by the FRP-grouting sleeve provided by the invention has the advantages that the external extending steel bars and the post-cast strip of the prefabricated part are eliminated, the length of the prefabricated part is reduced by multi-section splicing, the construction is convenient, the labor cost is saved, the on-site formwork support is reduced, and the construction efficiency is improved.
2. According to the long-span concrete beam connected by the FRP-grouting sleeve, the embedded sleeve, the connecting sleeve and the longitudinal steel bar play roles together to form the shear key, so that the shear resistance of the splicing section of the composite beam is improved, and the generation of concentrated cracks at the vertical splicing part of the precast concrete beam is delayed.
3. According to the long-span concrete beam connected by the FRP-grouting sleeve, the FRP bands at the dense splicing seams of the beam bottom can supplement and bear the tensile stress of the cross section, the FRP bands adhered at the vertical splicing seams can supplement and bear the shear stress of the cross section, the splicing seams of the beam are reinforced together, the bending resistance and the shearing resistance of the cross section are effectively improved, the bending rigidity of the cross section is enhanced, and the development of cracks at the splicing seams is delayed.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic side view of a long span concrete beam connected by an FRP-grout sleeve according to an embodiment of the present invention;
FIG. 2 is a partial schematic view of a long-span concrete beam connected by an FRP-grouting sleeve according to an embodiment of the invention;
fig. 3 is an overall schematic view of a long span concrete beam connected by an FRP-grout sleeve according to an embodiment of the present invention;
fig. 4 is a schematic bottom view of a long span concrete beam connected by an FRP-grout sleeve according to an embodiment of the present invention;
fig. 5 is a schematic view of a sleeve of a long span concrete beam connected by an FRP-grout sleeve according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a long-span concrete beam connected by an FRP-grout sleeve according to an embodiment of the present invention.
In the figure:
1-a reinforced concrete beam, 11-a first precast beam, 12-a second precast beam;
2-an embedded sleeve, 21-a first embedded sleeve, 22-a second embedded sleeve, 201-a first grouting hole, 202-a first grout outlet;
3-connecting sleeve, 301-connecting sleeve convex key, 302-second grouting hole;
4-longitudinal steel bar, 41-first longitudinal steel bar, 42-second longitudinal steel bar;
5-a first FRP tape;
6-a second FRP strip;
7-stirrup.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a long-span concrete beam connected by an FRP-grouting sleeve and a splicing method, which are used for realizing close splicing connection between prefabricated concrete beams, facilitating construction and improving the bearing capacity of spliced parts.
As shown in fig. 1, 2 and 3, the reinforced concrete beam 1 of the present embodiment is formed by connecting a first precast beam 11 and a second precast beam 12, the first precast beam 11 has a first end and a second end which are oppositely disposed, the second precast beam 12 has a third end and a fourth end which are oppositely disposed, and the second end of the first precast beam 11 and the third end of the second precast beam 12 are connected by an FRP-grouting sleeve. In the present embodiment, the right end of the first precast beam 11 is the second end, and the left end of the second precast beam 12 is the third end.
The first precast beam 11 and the second precast beam 12 are precast before splicing, bound through the stirrups 7 and the longitudinal steel bars 4 during prefabrication, and then concrete is poured to form the concrete beam. In this embodiment, the longitudinal steel bars 4 are divided into a first longitudinal steel bar 41 in the first precast beam 11 and a second longitudinal steel bar 42 in the second precast beam 12 according to the positions of the longitudinal steel bars.
A first embedded sleeve 21 is arranged at the second end of the first precast beam 11, and the first embedded sleeve 21 is perpendicular to the second end surface of the first precast beam 11; and a second embedded sleeve 22 is arranged at the third end of the second precast beam 12, and the second embedded sleeve 22 is perpendicular to the third end surface of the second precast beam 12. The first embedded sleeve 21 and the second embedded sleeve 22 are poured together in place when the first precast beam 11 and the second precast beam 12 are precast.
In this embodiment, the first embedded sleeve 21 and the second embedded sleeve 22 have the same shape, and the through holes of the first embedded sleeve 21 and the second embedded sleeve 22 are aligned in the direction.
The connecting sleeves 3 are arranged in the first embedded sleeve 21 and the second embedded sleeve 22, and the lengths of the connecting sleeves 3 in the first embedded sleeve 21 and the second embedded sleeve 22 are equal. The positions of the first pre-buried sleeve 21, the second pre-buried sleeve 22 and the connecting sleeve 3 are such that the first longitudinal steel bar 41 and the second longitudinal steel bar 42 are respectively extended into two sides of the connecting sleeve 3.
As shown in fig. 5, in order to facilitate the positioning of the connecting sleeve 3 in the first embedded sleeve 21 and the second embedded sleeve 22, a connecting sleeve convex key 301 is arranged in the circumferential direction of the connecting sleeve 3, a groove is arranged at the inner side of the joint of the first embedded sleeve 21 and the second embedded sleeve 22, and the connecting sleeve convex key 301 is matched with the grooves of the first embedded sleeve 21 and the second embedded sleeve 22 to form a key groove structure, so that the positioning is realized.
A second grouting hole 302 is formed in the circumferential direction of the connection sleeve 3, and a filling material can be poured into the connection sleeve 3 through the second grouting hole 302. Be equipped with first grout hole 201 and first grout outlet 202 respectively in first pre-buried sleeve 21, the circumference of second pre-buried sleeve 22, pour into filler material through first grout hole 201 in to first pre-buried sleeve 21 or the second pre-buried sleeve 22, gas outgoing in the sleeve when can making the grout through first grout outlet 202, the closely knit of packing of being convenient for.
In this embodiment, the filling material poured into the connecting sleeve 3, the first embedded sleeve 21, and the second embedded sleeve 22 is high-strength micro-expansion mortar. The inner wall surfaces of the first pre-buried sleeve 21, the second pre-buried sleeve 22 and the connecting sleeve 3 are subjected to rough treatment to enhance the adsorption effect of the grouting material. The rough surface treatment method comprises the steps of chiseling, grooving and polishing.
In order to improve the filling effect of the grouting material, the gap between the inner walls of the first pre-buried sleeve 21 and the second pre-buried sleeve 22 and the outer wall of the connecting sleeve 3 should be not less than 30 mm. The first pre-embedded sleeve 21, the second pre-embedded sleeve 22 and the connecting sleeve 3 can be made of carbon steel or stainless steel.
As shown in fig. 1 and 4, after the first precast beam 11 and the second precast beam 12 are spliced, the splice is connected by the first FRP tape 5 and the second FRP tape 6. The second FRP belt 6 is U-shaped, and is used for sticking the abutted seams of the bottom surface and the two side surfaces; the first FRP tape 5 is in a strip shape, and is adhered longitudinally to a seam at the bottom surface, i.e., in a direction perpendicular to the second FRP tape 6. The first FRP tape 5 may be attached to the inner side of the second FRP tape 6, that is, the first FRP tape 5 is attached first, and then the second FRP tape 6 is attached; the application may be performed in the reverse order.
Before the prefabricated concrete beam is adhered, the concrete surfaces around the lower surface seam and the vertical seams at two sides of the prefabricated concrete beam 1 are polished and cleaned, and dust and other impurities are removed. When pasting, the glue should be ensured to be fully soaked. After the FRP strip is pasted, the surface of the FRP strip can be subjected to protection treatment, and the surface protection material is reliably bonded with the FRP sheet. The corresponding protective material can be selected according to the special environment of the laminated slab, and specifically, mixed mortar can be used for surface protection treatment.
Besides FRP materials, other kinds of fibrous sheets may be used, such as one or more of glass fibers, basalt fibers, or aramid fibers. Accordingly, a suitable primer resin, leveling material, impregnating resin or FRP sheet binder should be used.
As shown in fig. 6, in the transverse cross-sectional direction of the first precast beam 11 and the second precast beam 12, the first embedded sleeve 21, the second embedded sleeve 22, the connecting sleeve 3, the first longitudinal steel bar 41, and the second longitudinal steel bar 42 are provided in pairs, and in this embodiment, 4 pairs are provided.
The FRP-grouting sleeve connecting node is formed by the first embedded sleeve 21, the second embedded sleeve 22, the connecting sleeve 3, the first longitudinal steel bars 41, the second longitudinal steel bars 42, the first FRP belt 5 and the second FRP belt 6.
It should be noted that, sleeve structures may be disposed at both ends of the first precast beam 11 and the second precast beam 12, so as to implement connection of multiple precast concrete beams. Meanwhile, the splicing position between the beam sections should avoid the midspan as much as possible, and be arranged near the recurved point as much as possible, and is generally arranged at the position of 1/4 beam length.
In the invention, the embedded sleeve 2, the connecting sleeve 3 and the longitudinal steel bar 4 act together to serve as a shear key, so that the shear resistance of the abutted seam is enhanced. The FRP band at the abutted seam part enhances the integrity of the precast concrete beam, delays the crack development at the abutted seam part, reduces the generation of concentrated cracks and improves the integral bearing capacity of the precast concrete beam.
The invention also provides a processing method of the long-span concrete beam connected by the FRP-grouting sleeve, which specifically comprises the following steps:
step 1, prefabricating a first prefabricated beam 11 and a second prefabricated beam 12 which are provided with longitudinal steel bars 4 and embedded sleeves 2;
in the step, firstly, the stirrups 7 and the longitudinal steel bars 4 are bound, then the embedded sleeves 2 are fixed according to set positions, finally, the formwork is erected, and concrete is poured to form the concrete precast beam.
step 3, grouting the connecting sleeve 3, the first embedded sleeve 21 and the second embedded sleeve 22;
and 4, adhering a first FRP (fiber reinforced Plastic) belt 5 and a second FRP belt 6 at the joint of the first precast beam 11 and the second precast beam 12.
Before the FRP belt is adhered, the surface of the precast concrete beam is treated, so that the surface is ensured to be clean; after the FRP tape is attached, a surface treatment may be performed using the mixed mortar.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A long-span concrete beam connected by an FRP (fiber reinforced plastic) -grouting sleeve comprises a first precast beam and a second precast beam, wherein the first precast beam is provided with a first end and a second end which are oppositely arranged, the second precast beam is provided with a third end and a fourth end which are oppositely arranged, the second end of the first precast beam is oppositely arranged with the third end of the second precast beam, the second end of the first precast beam and the third end of the second precast beam are connected by an FRP-grouting sleeve node, and the FRP-grouting sleeve node comprises a first embedded sleeve, a second embedded sleeve, a connecting sleeve, a first FRP belt and a second FRP belt, the first embedded sleeve is arranged at the second end of the first precast beam and is vertical to the end surface of the first precast beam, the second embedded sleeve is arranged at the third end of the second precast beam and is vertical to the end surface of the second precast beam, the first pre-buried sleeve and the second pre-buried sleeve are circumferentially aligned, the connecting sleeve is located in the first pre-buried sleeve and the second pre-buried sleeve, filling materials are filled in the connecting sleeve and between the connecting sleeve and the first pre-buried sleeve and between the connecting sleeve and the second pre-buried sleeve, and the first FRP belt and the second FRP belt are adhered to the joint of the first precast beam and the second precast beam.
2. The long-span concrete beam connected by the FRP-grouting sleeve as claimed in claim 1, wherein the second FRP band is U-shaped, and the second FRP band is attached along three sides of the connection of the first precast beam and the second precast beam.
3. The long-span concrete beam connected by the FRP-grouting sleeve as claimed in claim 2, wherein the first FRP strip is in a shape of a strip, and the first FRP strip is stuck perpendicular to a joint of the first precast beam and the second precast beam.
4. The long-span concrete beam connected by the FRP-grouting sleeves as claimed in claim 1, wherein the first pre-embedded sleeve and the second pre-embedded sleeve are respectively provided with a first grouting hole and a first grout outlet, and the connecting sleeve is provided with a second grouting hole.
5. The long-span concrete beam connected by the FRP-grouting sleeve as claimed in claim 1, wherein a groove is formed at the inner side of the joint of the first embedded sleeve and the second embedded sleeve, a convex key is formed at the circumferential direction of the connecting sleeve, and the convex key of the connecting sleeve is matched with the groove of the first embedded sleeve and the groove of the second embedded sleeve.
6. The long-span concrete beam connected by means of the FRP-grout sleeve as claimed in claim 1, wherein first longitudinal reinforcing bars are provided in the first precast beam, second longitudinal reinforcing bars are provided in the second precast beam, one end of the first longitudinal reinforcing bars is inserted into the connection sleeve, and one end of the second longitudinal reinforcing bars is inserted into the connection sleeve.
7. The long-span concrete beam connected by the FRP-grout sleeve as claimed in claim 1, wherein the filling material inside the connection sleeve and between the connection sleeve and the first and second pre-buried sleeves is high-strength micro-expansion mortar.
8. The long-span concrete beam connected by the FRP-grouting sleeve according to claim 1, wherein inner wall surfaces of the first pre-buried sleeve, the second pre-buried sleeve, and the connection sleeve are rough structures.
9. The long-span concrete beam connected by the FRP-grout sleeve as claimed in claim 1, wherein the pre-buried sleeve is also provided at the first end of the first precast beam and the fourth end of the second precast beam.
10. A method for processing a long span concrete beam connected by FRP-grout sleeve according to any one of claims 1 to 9, which comprises the steps of:
prefabricating the first precast beam and the second precast beam with the longitudinal steel bars and the embedded sleeves;
hoisting the first precast beam or the second precast beam in place, installing the connecting sleeve, and splicing the second precast beam or the first precast beam with the first precast beam or the second precast beam;
grouting the connecting sleeve, the first embedded sleeve and the second embedded sleeve;
and adhering the first FRP strip and the second FRP strip at the joint of the first precast beam and the second precast beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210226120.8A CN114592605A (en) | 2022-03-08 | 2022-03-08 | Long-span concrete beam connected by FRP (fiber reinforced plastic) -grouting sleeve and processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210226120.8A CN114592605A (en) | 2022-03-08 | 2022-03-08 | Long-span concrete beam connected by FRP (fiber reinforced plastic) -grouting sleeve and processing method |
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| CN114592605A true CN114592605A (en) | 2022-06-07 |
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| CN202210226120.8A Pending CN114592605A (en) | 2022-03-08 | 2022-03-08 | Long-span concrete beam connected by FRP (fiber reinforced plastic) -grouting sleeve and processing method |
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