CN115450144A - Rusted concrete beam reinforcing method and structure - Google Patents
Rusted concrete beam reinforcing method and structure Download PDFInfo
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- CN115450144A CN115450144A CN202211150720.7A CN202211150720A CN115450144A CN 115450144 A CN115450144 A CN 115450144A CN 202211150720 A CN202211150720 A CN 202211150720A CN 115450144 A CN115450144 A CN 115450144A
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 230000002787 reinforcement Effects 0.000 claims abstract description 30
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000004873 anchoring Methods 0.000 claims abstract description 17
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 238000004080 punching Methods 0.000 claims description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000002513 implantation Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 230000002028 premature Effects 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 71
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 47
- 239000011151 fibre-reinforced plastic Substances 0.000 description 47
- 230000000694 effects Effects 0.000 description 6
- 238000005336 cracking Methods 0.000 description 5
- 239000011241 protective layer Substances 0.000 description 5
- 150000001804 chlorine Chemical class 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010205 computational analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method and a structure for reinforcing a rusted concrete beam, which belong to the technical field of rusted concrete beam repair and reinforcement and comprise the following steps: removing the rusted concrete layer of the concrete beam to expose the rusted steel bars, and removing rust on the rusted steel bars; implanting chemical bolts on the surface of the concrete without the rust corrosion, and pouring a new concrete layer, wherein the chemical bolts penetrate through the new concrete layer; adhering an FRP plate on the surface of the new concrete layer, installing an anchoring steel fastener by using a chemical bolt, and applying pre-pressure to the anchoring steel fastener by using a torque wrench to finish the reinforcement of the rusted concrete beam. The method not only inhibits premature peeling of the FRP and concrete interface by applying the pre-pressure, but also inhibits the separation of the interface by transmitting the pressure to the new and old concrete interface through the bolt, and the bolt and bolt function of the bolt also inhibits the peeling of the new and old concrete interface, thereby further improving the reinforcing effect of the rusty beam.
Description
Technical Field
The invention belongs to the technical field of rusted concrete beam repair and reinforcement, and particularly relates to a rusted concrete beam reinforcement method and a rusted concrete beam reinforcement structure.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Concrete bridges in coastal environments are affected by severe corrosion environments and complex load forms, the long-term service performance of the concrete bridges is insufficient, and the safety performance and service life of the concrete bridges are seriously affected. The corrosion damage of the steel bars is the first factor influencing the durability of the concrete, and the corrosion of the concrete bridge by the chloride ions causes the rust expansion and cracking of the protective layer, so that the corrosion of the steel bars is further accelerated, and the durability of the concrete bridge is seriously influenced. A large amount of experimental research and computational analysis have been carried out by domestic and foreign scholars on the reinforcement and reinforcement of bridges, and it is found that Fiber Reinforced Polymer (FRP) is gradually and widely applied to the reinforcement and reconstruction of bridges due to its light weight and high efficiency. When the FRP is used for reinforcing a corroded concrete beam, in order to prevent the reinforced steel bar from being corroded continuously, the common method is to remove a damaged concrete protective layer, derust the steel bar, pour concrete again and stick the FRP.
But for coastal rusted concrete bridges, the bonding effect of the FRP and the concrete interface is weakened by chlorine salt corrosion and rust swelling cracking, and the FRP stripping is accelerated; meanwhile, the FRP fails prematurely due to stripping of the concrete protective layer caused by the rust cracking, and the reliability and durability of FRP reinforcement are obviously reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a reinforcement method and a reinforcement structure for a rusted concrete beam, wherein the reinforcement method is based on a hybrid-bonded FRP (HB-FRP) reinforcement method, not only is the premature peeling of the FRP and the concrete interface inhibited by applying pre-pressure, but also the separation of the interface is inhibited by transmitting the pressure to the new and old concrete interfaces through bolts, and the peeling of the new and old concrete interfaces is also inhibited by the pin bolt effect of the bolts, so that the reinforcement effect of the rusted beam is further improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a method for reinforcing a rusted concrete beam, which comprises the following steps:
removing a rusted concrete layer of the concrete beam to expose the rusted reinforcing steel bars, and removing rust from the rusted reinforcing steel bars;
implanting chemical bolts on the surface of the concrete without the rust corrosion, and pouring a new concrete layer, wherein the chemical bolts penetrate through the new concrete layer;
adhering an FRP plate on the surface of the new concrete layer, installing an anchoring steel fastener by using a chemical bolt, and applying pre-pressure to the anchoring steel fastener by using a torque wrench to finish the reinforcement of the rusted concrete beam.
As a further technical scheme, rust-removed steel bars are protected until a new concrete layer is poured.
As a further technical scheme, the implantation process of the chemical bolt comprises the following steps:
positioning a chemical bolt implantation position on the surface of the rusted concrete to perform pre-punching; and (4) after the hole channel is cleaned, implanting the chemical bolt into the pre-punched hole through the bar-implanting glue, and maintaining until the strength reaches the standard.
As a further technical scheme, the bottom surface of the concrete layer is pre-perforated upwards at intervals, and chemical bolts are implanted into the inner part of the old concrete layer reserved by the concrete beam.
As a further technical scheme, the chemical bolt thread of the position applying the pre-pressure is protected.
As a further technical scheme, the exposed steel bars are covered in the new concrete layer to replace the position of the rusted concrete layer.
As a further technical scheme, the sticking process of the FRP plate comprises the following steps: treat that new concrete layer maintenance is up to standard to intensity, paste the position at new concrete layer surface location FRP board and carry out the chisel hair processing, combine FRP board and concrete surface through the binder, the maintenance is up to standard to intensity.
As further technical scheme, the FRP board is pasted at new concrete layer bottom, and the chemistry bolt passes the FRP board, and behind the chemical bolt installation anchor steel fastener, anchor steel fastener and the laminating of FRP board, and the chemical bolt cover establishes the nut and fixes anchor steel fastener.
In a second aspect, the invention also provides a rusted concrete beam reinforcing structure, which comprises a concrete layer, wherein a plurality of longitudinal steel bars are distributed in the concrete layer, and stirrups are connected between the longitudinal steel bars; paste to set up the FRP board bottom the concrete layer, wear to establish chemical bolt in the concrete layer, chemical bolt passes new concrete layer, FRP board, and chemical bolt installs anchor steel fastener and nut, and anchor steel fastener pastes the setting with the FRP board, and the nut locks anchor steel fastener.
As a further technical scheme, the upper part of the concrete layer is an old concrete layer, the lower part of the concrete layer is a new concrete layer, stirrups and longitudinal reinforcements positioned on the upper part are positioned in the old concrete layer, and stirrups and longitudinal reinforcements positioned on the lower part are positioned in the new concrete layer; the FRP plate is stuck to the bottom of the new concrete layer, and the top end of the chemical bolt is placed in the old concrete layer.
The beneficial effects of the invention are as follows:
compared with the traditional HB-FRP reinforcing mechanism, the reinforcing method provided by the invention has the advantages that after the rusted concrete layer is removed, the chemical bolt is implanted and penetrates through the new concrete layer and the FRP plate, the chemical bolt anchoring steel fastener applies pre-pressure, the premature peeling of the FRP and the concrete interface is inhibited by applying the pre-pressure, and the pressure is transmitted to the new and old concrete interface through the bolt so as to inhibit the separation of the interface.
According to the reinforcing method, the new and old concrete layers and the FRP plates are connected through the chemical bolts, the stripping of the new and old concrete interfaces is also inhibited under the bolt pin effect of the bolts, the reinforcing method is an effective means for responding to the stripping of the protective layer and the stripping of the FRP interfaces, and has good applicability in the coastal bridge reinforcement.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of a reinforced structure of a rusted concrete beam according to the present invention;
FIG. 2 is a schematic top view of the anchoring steel fastener of the present invention;
FIG. 3 is a schematic front view of an anchoring steel fastener of the present invention;
FIG. 4 is a schematic flow chart of the method for reinforcing a rusted concrete beam according to the present invention;
in the figure: the mutual spacing or size is exaggerated to show the position of each part, and the schematic diagram is only used for illustration;
wherein, 1 is the stirrup, 2 is the longitudinal reinforcement, 3 is old concrete layer, 4 is new concrete layer, 5 is the chemical bolt, 6 is the FRP board, 7 is the anchor steel fastener, 8 is applying the precompression, 9 is corrosion concrete layer.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As introduced in the background art, when the FRP is used for reinforcing a rusted concrete beam for a coastal rusted concrete bridge, the bonding effect of the FRP and a concrete interface is weakened due to chlorine salt corrosion and rust swelling cracking, and the peeling of the FRP is accelerated; meanwhile, the FRP fails prematurely due to stripping of the concrete protective layer caused by the rust cracking, and the reliability and durability of FRP reinforcement are obviously reduced.
In order to solve the technical problems, the invention provides a rusted concrete reinforcing method, which is based on a hybrid-bonded FRP (HB-FRP) reinforcing method, but is different from the traditional HB-FRP reinforcing method in that not only is the premature peeling of the FRP and the concrete interface inhibited by applying pre-pressure, but also the separation of the interface is inhibited by transmitting the pressure to the new and old concrete interfaces through bolts, and the peeling of the new and old concrete interfaces is also inhibited by the pin bolt effect of the bolts, so that the reinforcing effect of a rusted beam is further improved.
In an exemplary embodiment of the present invention, as shown in fig. 3, a method for reinforcing a rusted concrete beam is provided, in which the reinforcing members include a chemical bolt 5, a chemical adhesive, an anchoring steel fastener 7, and a bolt mating nut.
The concrete layer lower part of corrosion concrete beam is the corrosion part, for corrosion concrete layer 9, and concrete layer upper portion is old concrete layer 3, lays many longitudinal reinforcement 2 in the concrete layer, connects stirrup 1 between the longitudinal reinforcement 2, is located lower part stirrup 1 and longitudinal reinforcement 2 and is located corrosion concrete layer 9, and the reinforcing bar surface also can take place the corrosion.
The reinforcing process comprises the steps of removing the rusted concrete layer 9, removing rust on the steel bars, pre-planting the chemical bolts 5, pouring the new concrete layer 4, adhering the FRP plate 6 and applying pre-pressure to the new concrete layer 4 and the FRP plate 6 through the chemical bolts 5.
Specifically, the reinforcement method comprises the following steps:
step (1): removing the rusted concrete layer 9 and removing rust on the steel bars;
the concrete layer (namely the rusted concrete layer 9) at the rusty part of the concrete beam is completely removed, the rusted steel bars are completely exposed and comprise the longitudinal steel bars 2 and the stirrups 1 which are positioned at the lower part of the concrete layer, the rusted steel bars are subjected to rust removal treatment on the basis, and the steel bars are protected after rust removal until a new concrete layer is poured.
Step (2): pre-planting chemical bolts 5, and pouring a new concrete layer 4;
positioning the implantation position of a chemical bolt 5 on the surface of the rusted concrete to perform pre-punching; after cleaning the pore channel, implanting a chemical bolt 5 into the pre-punched hole through bar-implanting glue, and maintaining until the strength reaches the standard; protecting the bolt threads of the position where the pre-pressure is applied, supporting the template, and finally pouring the new concrete layer 4, wherein the chemical bolt 5 penetrates through the new concrete layer 4.
And (3): sticking the FRP plate 6 and applying pre-pressure;
curing the new concrete layer 4 until the strength reaches the standard, positioning the sticking position of the FRP plate 6 on the surface of the new concrete layer 4 for chiseling treatment, combining the FRP plate 6 with the concrete surface through a binder, and curing until the strength reaches the standard; and (3) mounting a matched anchoring steel fastener 7 and a nut on the chemical bolt 5, and applying pre-pressure to the anchoring steel fastener 7 through a torque wrench, so that the pre-pressure is applied to the FRP and the concrete, and the reinforcement of the rusted concrete beam is completed.
In the step (2), pre-punching holes into the old concrete layer 3 at the bottom surface of the concrete layer without rust, wherein the punching direction is upward and a plurality of holes are punched at intervals; the chemical bolts 5 are then implanted in the corresponding pre-drilled holes.
In the step (2), the new concrete layer 4 is poured at the bottom of the old concrete layer 3, and the exposed steel bars are covered in the new concrete layer to replace the original position of the rusted concrete layer 9.
In an alternative embodiment, the chemical bolts 5 may take the form of inverted cone bolts.
In the step (2), the chemical bolts 5 are implanted into the old concrete layer 3 reserved by the concrete beam to clean the hole, so that the influence of dust on the cohesiveness is prevented. The screw thread at the pre-pressure position of the chemical bolt 5 is protected, and the screw thread is prevented from being covered when concrete is poured.
Wherein, in step (3), FRP board 6 is pasted at 4 bottoms on new concrete layer, and chemical bolt 5 passes FRP board 6, and after chemical bolt 5 installed anchor steel fastener 7, anchor steel fastener 7 and the laminating of FRP board 6, and chemical bolt 5 cover establish the nut and fix anchor steel fastener 7.
In another exemplary embodiment of the present invention, as shown in fig. 1-2, a reinforced structure of a rusted concrete beam is proposed, which is a structure for mechanically anchoring and inhibiting double-interface peeling.
The reinforced structure comprises a concrete layer, wherein a plurality of longitudinal steel bars 2 (only part of the longitudinal steel bars 2 are shown in figure 1) are distributed in the concrete layer, and stirrups 1 are connected between the longitudinal steel bars 2; concrete layer upper portion is old concrete layer 3, and concrete layer lower part is new concrete layer 4, and stirrup 1 and the longitudinal reinforcement 2 that are located upper portion are located old concrete layer 3, and stirrup 1 and the longitudinal reinforcement 2 that are located the lower part are located new concrete layer 4.
The FRP plate 6 is stuck to the bottom of the concrete layer, and particularly the FRP plate 6 is stuck to the bottom of the new concrete layer 4; wear to establish chemical bolt 5 in the concrete layer, in old concrete layer 3 was put into on 5 tops of chemical bolt, chemical bolt 5 passed new concrete layer 4, FRP board 6, and chemical bolt 5 installed anchor steel fastener 7 and nut, and anchor steel fastener 7 pastes the setting with FRP board 6 mutually, and the nut locks anchor steel fastener 7. The anchoring steel fastener 7 is plate-shaped and is provided with a through hole for the chemical bolt 5 to pass through. In the side direction of concrete beam, wear to establish two chemical bolts, two chemical bolts are connected through same anchor steel fastener, therefore in this embodiment, anchor steel fastener sets up two through-holes.
The FRP plate 6 is provided with a through hole for the chemical bolt 5 to pass through.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for reinforcing a rusted concrete beam is characterized by comprising the following steps:
removing a rusted concrete layer of the concrete beam to expose the rusted reinforcing steel bars, and removing rust from the rusted reinforcing steel bars;
implanting chemical bolts on the surface of the concrete without the rust corrosion, and pouring a new concrete layer, wherein the chemical bolts penetrate through the new concrete layer;
adhering an FRP plate on the surface of the new concrete layer, installing an anchoring steel fastener by using a chemical bolt, and applying pre-pressure to the anchoring steel fastener by using a torque wrench to finish the reinforcement of the rusted concrete beam.
2. A method of reinforcing a rusted concrete beam as claimed in claim 1, wherein the rust removed steel bars are protected until a new concrete layer is poured.
3. The method for reinforcing a rusted concrete beam according to claim 1, wherein the implanting of the chemical bolts comprises the following steps:
positioning a chemical bolt implantation position on the surface of the concrete with the rust removed, and performing pre-punching; and (4) after the pore channel is cleaned, implanting the chemical bolt into the pre-punched hole through the bar-implanting glue, and maintaining until the strength reaches the standard.
4. The method for reinforcing a rusted concrete beam according to claim 3, wherein a plurality of holes are pre-perforated upward at intervals at the position where the bottom surface of the rusted concrete layer is removed, and chemical bolts are implanted into the inside of the old concrete layer reserved for the concrete beam.
5. A method of reinforcing a rusted concrete beam according to claim 1, wherein a chemical bolt thread of a portion to which a pre-stress is applied is protected.
6. A method of reinforcing a rusted concrete beam as claimed in claim 1, wherein the new concrete layer covers the exposed reinforcing bars therein instead of the rusted concrete layer.
7. The method for reinforcing a rusted concrete beam according to claim 1, wherein the adhering process of the FRP plate is as follows: treat that new concrete layer maintenance is up to standard to intensity, fix a position FRP board on new concrete layer surface and paste the position and carry out the chisel hair and handle, combine FRP board and concrete surface through the binder, the maintenance is up to standard to intensity.
8. The method for reinforcing the rusted concrete beam according to claim 1, wherein the FRP plate is adhered to the bottom of the new concrete layer, the chemical bolt penetrates through the FRP plate, after the anchoring steel fastener is installed on the chemical bolt, the anchoring steel fastener is attached to the FRP plate, and the chemical bolt is sleeved with the nut to fix the anchoring steel fastener.
9. A rusted concrete beam reinforcing structure is characterized by comprising a concrete layer, wherein a plurality of longitudinal steel bars are distributed in the concrete layer, and stirrups are connected between the longitudinal steel bars; paste to set up the FRP board bottom the concrete layer, wear to establish chemical bolt in the concrete layer, chemical bolt passes new concrete layer, FRP board, and chemical bolt installs anchor steel fastener and nut, and anchor steel fastener pastes the setting with the FRP board, and the nut locks anchor steel fastener.
10. The rusted concrete beam reinforcing structure of claim 9, wherein the upper portion of the concrete layer is an old concrete layer, the lower portion of the concrete layer is a new concrete layer, the stirrups and the longitudinal reinforcements located at the upper portion are located in the old concrete layer, and the stirrups and the longitudinal reinforcements located at the lower portion are located in the new concrete layer; the FRP plate is stuck to the bottom of the new concrete layer, and the top end of the chemical bolt is placed in the old concrete layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211150720.7A CN115450144A (en) | 2022-09-21 | 2022-09-21 | Rusted concrete beam reinforcing method and structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211150720.7A CN115450144A (en) | 2022-09-21 | 2022-09-21 | Rusted concrete beam reinforcing method and structure |
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2022
- 2022-09-21 CN CN202211150720.7A patent/CN115450144A/en active Pending
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Inventor after: Gao Lei Inventor after: Gao Xiaohua Inventor after: Gao Huarui Inventor after: Zhang Feng Inventor after: Zhang Luke Inventor after: Zhao Guohao Inventor before: Gao Lei Inventor before: Gao Xiaohua Inventor before: Zhang Feng Inventor before: Zhang Luke Inventor before: Zhao Guohao |
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Effective date of registration: 20231110 Address after: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Applicant after: SHANDONG University Applicant after: Shandong high speed Construction Management Group Co.,Ltd. Address before: 250061, No. ten, No. 17923, Lixia District, Ji'nan City, Shandong Province Applicant before: SHANDONG University |