CN105625197A - Concrete beam bending reinforcing method based on steel plate-prestressed carbon fiber plate - Google Patents
Concrete beam bending reinforcing method based on steel plate-prestressed carbon fiber plate Download PDFInfo
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- CN105625197A CN105625197A CN201610003427.6A CN201610003427A CN105625197A CN 105625197 A CN105625197 A CN 105625197A CN 201610003427 A CN201610003427 A CN 201610003427A CN 105625197 A CN105625197 A CN 105625197A
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention provides a concrete beam bending reinforcing method based on a steel plate-prestressed carbon fiber plate. Firstly, a stele plate is pasted on a concrete beam, and U-shaped steel plate hoops are adopted for anchorage; secondly, wave-shaped tooth plates are arranged on the anchorage end and the tensioning end of the steel plate and are used for restraining a carbon fiber plate, and devices such as counter-force blocks and fixed blocks are arranged on the tensioning end of the prestressed carbon fiber plate; a jack is adopted to exert prestressed force, and the carbon fiber plate is tensioned and anchored; and finally, the surface of the prestressed carbon fiber plate and the wave-shaped tooth plates are whitewashed with cement composite mortar to serve as protection layers, and bending reinforcing of the concrete beam is completed. According to the method, the bending bearing capacity of the reinforced concrete beam is obviously improved, and the utilization efficiency of a reinforcing material is improved.
Description
Technical field
The invention belongs to the technical field that civil engineering structure is reinforced, particularly relate to a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate.
Background technology
Along with bridge uses the growth of time, traffic flow, the serviceability of a lot of bridge structures can not meet current functional requirement, for making its function that returns to normal condition to reinforce. Additionally, due to the requirement of the damage in building structure life-time service process, the factor such as aging or overbuilding story transformation or use the change etc. of function, make the Lack of support of original structure, it is also desirable to increased substantially the bearing capacity of component by the method reinforced.
At present, in the actual reinforcing process to beams of concrete, steel plate and carbon fiber sheet are two kinds and use material widely, bonding steel plate method reinforcement performance is better, bearing capacity and rigidity to component improve, and save use space, construction is simple, easily anchoring, component after affixing steel plate reinforcement is by being loaded in destructive process and all can keep good ductility, but thickness and the number of plies of reinforcing steel plate used are all restricted, and affixing steel plate reinforcement belongs to secondary loading, the effect of component is only just occurred by it when component load-bearing again, bearing capacity improves limited. sticking carbon fiber plate method for strengthening can improve the bearing capacity of beams of concrete by a relatively large margin, and easily pastes, but the component after being reinforced by this method, the ductility in cross section is greatly lowered, and rigidity improves less, and not easily anchors, and the utilization rate of material is relatively low. a kind of upgrading being carbon fiber board is reinforced reinforced by pre-stressed carbon fiber plate, and it is the process of an active force, it is possible to namely beam is worked after reinforcing completes, and fracture also has good closure function, and the utilization rate of material is high. but its shortcoming still exists, pre-stressed carbon fiber plate anchoring difficulty on beams of concrete, it is easy to stripping damage occurs, easily there is brittle break in beams of concrete after reinforcing, meanwhile, currently used carbon fiber board tensioning equipment is more complicated, heavy, construction inconvenience.
Summary of the invention
The technical problem to be solved is in that for above-mentioned Problems existing, a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate is provided, with bi-material composite reinforcement beams of concrete, both the bearing capacity of beams of concrete can have been increased substantially, the rigidity of beams of concrete, ductility, globality and reliability can be improved again, and easy construction, economic and practical, have broad application prospects.
This invention address that above-mentioned technical problem be the technical scheme is that a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate, it is characterised in that comprise the steps:
A) beams of concrete surface treatment, first closes beams of concrete surface crack or embedding processes, and cuts laitance layer, be completely exposed the new face of concrete after reaching curing time; Secondly carry out dabbing process with cutting the new face of the axe concrete to exposing, form smooth matsurface; Again with the scum silica frost on water cleaning concrete surface, dust; Finally uneven more serious surface epoxy resin mortar is repaired;
B) blanking of steel plate and process, first according to steel plate design size, adopts factory's automatically or semi-automatically cutting method to cut, the defect of the cut edge smooth surface of the steel plate after molding, impulse-free robustness, seaming and warpage; Then, being polishing to present metallic luster with polisher to steel plate bond area, polishing lines should be vertical with steel plate Impact direction, and makes steel plate bond area have roughness, is eliminated rust to presenting metallic luster in plate exposure face, and make plate exposure face keep dry; Finally the fixed block of fixing end waveform tooth plate and stretching end is welded on the corresponding position of the non-bond area of steel plate;
C) stickup and fixation steel plate, spread upon on processed good beams of concrete bottom surface and steel plate bond area by adhesive simultaneously; Then by steel sticking in precalculated position, after steel sticking is good, the pressure of 0.05��0.1MPa need to be applied on its surface, make adhesive just be extruded as from the side seam of steel plate suitable, then make adhesive solidify more than 20 DEG C under room temperature 24 hours, during solidification, steel plate must not be had any disturbance; Finally, remove surface of steel plate dirt and rust staining, plate exposure face is brushed twice rust phenolphthalein antirust paint then twice Lycoperdon polymorphum Vitt finish paint of outer painting;
D) paste and fixing U-shaped steel plate hoop, carry out in the termination, two ends of steel plate holing, clear hole and injecting glue, then paste U-shaped steel plate hoop with adhesive respectively, and undertaken strengthening anchoring by bolt;
E) stretch-draw of pre-stressed carbon fiber plate and anchoring, according to design size cutting pre-stressed carbon fiber plate, and the two ends of the pre-stressed carbon fiber plate cut are respectively placed between base plate and the cover plate of anchored end waveform tooth plate and stretching end waveform tooth plate, and make the pre-stressed carbon fiber plate longitudinal axis centrage by waveform tooth plate, by the screw rod on stretching end waveform tooth plate through the through hole on fixed block, at external part sheathed fixing nut, counter-force block and the counter-force nut successively of screw rod; Then with spanner, each nut of waveform tooth plate is applied corresponding torsion, it is ensured that the effectively anchoring of carbon fiber board is not cut off again carbon filament by waveform tooth plate; Being placed in by jack between fixed block and counter-force block, after tightening counter-force nut, stretch-draw jack is to control stress for prestressing step by step; After stretch-draw completes, screw up with a wrench fixing nut, removal jack; Finally, whitewashing cementitious composite mortar as overcoat on pre-stressed carbon fiber plate surface and waveform tooth plate, what complete beams of concrete is anti-bend reinforced.
By such scheme, described step A) described in laitance layer thickness be 2mm��3mm, the described dabbing degree of depth is not less than 6mm.
By such scheme, described step A) in be additionally included in be completely exposed the new face of concrete after the position that there is cavity blemish carried out envelope benefit process.
By such scheme, described step C) described in the smearing thickness of adhesive be 3��5mm, thick middle both sides are thin.
By such scheme, described step C) in has pasted steel plate after also need to knock steel plate gently, as without cavity sound, represent and pasted closely knit, if there being empty sound, indicating air, not pasting closely knit, steel plate should be peeled, re-paste after benefit adhesive.
By such scheme, described step D) in first verify the reinforcement location in beams of concrete before boring, and mark, release the position of boring.
By such scheme, described anchored end waveform tooth plate and stretching end waveform tooth plate all include cover plate and base plate, the corresponding inner side end of described cover plate and base plate is wavy surface, and base plate is connected by Bolt to position with cover plate, and the end face outside of the base plate of stretching end waveform tooth plate is provided with screw rod.
The invention has the beneficial effects as follows: 1, a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate is provided, utilize easy anchoring during affixing steel plate reinforcement, the ground tackle of pre-stressed carbon fiber plate is fixed on steel plate, thus improve pre-stressed carbon fiber plate reinforce reliability and concrete beam strengthening after globality, ductility and rigidity that steel plate is good can also be utilized, solve the not enough problem of the reduction of beams of concrete ductility and rigidity when pre-stressed carbon fiber plate is reinforced; 2, the carbon fiber board of Shi Hanzhang, beams of concrete is made to become the component of an active force, after strengthening construction completes, namely beam body starts stress, the bearing capacity making component is greatly improved, simultaneously, prestressing force also makes the crack on beams of concrete reduce, even close, reduce reinforcing bar by the corrosion function suffered by crack, improve the durability of beams of concrete, improve the holistic resistant behavior of beams of concrete, in the use procedure in beams of concrete later stage, can according to the situation of loss of prestress, Shi Hanzhang again.
Accompanying drawing explanation
Fig. 1 is the front view of one embodiment of the invention.
Fig. 2 is the top view of one embodiment of the invention.
Fig. 3 is the structural representation of the anchored end waveform tooth plate of one embodiment of the invention.
Fig. 4 is the structural representation of the stretching end waveform tooth plate of one embodiment of the invention.
Wherein: 1. steel plate, 2. pre-stressed carbon fiber plate, end waveform tooth plate, 4. bolt, 5. beams of concrete are 3. fixed, 6. stretching end waveform tooth plate, 7. fixed block, 8. counter-force block, 9. screw rod, 10. fixing nut, 11. counter-force nut, 12.U shape steel plate hoop, 13. base plates, 14. cover plates.
Detailed description of the invention
For being more fully understood that the present invention, below in conjunction with drawings and Examples to further description of the present invention.
As shown in Figure 1-2, a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate, it is characterised in that comprise the steps:
1, beams of concrete 5 surface treatment, first closes the surface crack of beams of concrete or embedding processes after reaching curing time and cuts 2��3mm thickness laitance layer, is completely exposed the new face of concrete; Secondly carrying out dabbing process with cutting the new face of the axe concrete to exposing, form smooth matsurface, the dabbing degree of depth is not less than 6mm; Again with the scum silica frost on water cleaning concrete surface, dust; Finally uneven more serious surface epoxy resin mortar is repaired;
2, the blanking of steel plate 1 and process, first according to steel plate design size, adopts factory's automatically or semi-automatically cutting method to cut, the defect of the cut edge smooth surface of the steel plate after molding, impulse-free robustness, seaming and warpage; Then, being polishing to present metallic luster with polisher to steel plate bond area, polishing lines should be vertical with steel plate Impact direction, and makes steel plate bond area have roughness, is eliminated rust to presenting metallic luster in plate exposure face, and make plate exposure face keep dry; Finally the fixed block 7 of fixing end waveform tooth plate 3 and stretching end is welded on the corresponding position of the non-bond area of steel plate;
3, stickup and fixation steel plate, spread upon adhesive on processed good beams of concrete bottom surface and steel plate bond area simultaneously, and smearing thickness is 3��5mm, and thick middle both sides are thin; Then by steel sticking in precalculated position, after steel sticking is good, steel plate is knocked gently, as without cavity sound, expression has been pasted closely knit, if there being empty sound, indicate air, do not paste closely knit, steel plate should be peeled, re-paste after mending adhesive, the pressure of 0.05��0.1MPa need to be applied on its surface, make adhesive just be extruded as from the side seam of steel plate suitable, then make adhesive solidify more than 20 DEG C under room temperature 24 hours, during solidification, steel plate must not be had any disturbance; Finally, remove surface of steel plate dirt and rust staining, plate exposure face is brushed twice rust phenolphthalein antirust paint then twice Lycoperdon polymorphum Vitt finish paint of outer painting;
4, paste and fixing U-shaped steel plate hoop 12, carry out in the termination, two ends of steel plate holing, clear hole and injecting glue, then paste U-shaped steel plate hoop with adhesive respectively, and undertaken strengthening anchoring by bolt 4, first verify the reinforcement location in beams of concrete before boring, and mark, release the position of boring;
5, the stretch-draw of pre-stressed carbon fiber plate 2 and anchoring, according to design size cutting pre-stressed carbon fiber plate, and the two ends of the pre-stressed carbon fiber plate cut are respectively placed between base plate 13 and the cover plate 14 of anchored end waveform tooth plate and stretching end waveform tooth plate 6, and make the pre-stressed carbon fiber plate longitudinal axis centrage by waveform tooth plate, by the screw rod 9 on stretching end waveform tooth plate through the through hole on fixed block, at external part sheathed fixing nut 10, counter-force block 8 and the counter-force nut 11 successively of screw rod; Then with spanner, each nut of waveform tooth plate is applied corresponding torsion, it is ensured that the effectively anchoring of carbon fiber board is not cut off again carbon filament by waveform tooth plate; Being placed in by jack between fixed block and counter-force block, after tightening counter-force nut, stretch-draw jack is to control stress for prestressing step by step; After stretch-draw completes, screw up with a wrench fixing nut, removal jack; Finally, whitewashing cementitious composite mortar as overcoat on pre-stressed carbon fiber plate surface and waveform tooth plate, what complete beams of concrete is anti-bend reinforced.
Two kinds of conventional reinforcement means are effectively combined by the present invention, and each doing his best to make steel plate and pre-stressed carbon fiber plate, brings out the best in each other. Both easy anchoring during affixing steel plate reinforcement can have been utilized, pre-stressed carbon fiber plate is fixed on steel plate, thus improve pre-stressed carbon fiber plate reinforce reliability and concrete beam strengthening after globality, ductility and rigidity that steel plate is good can also be utilized, make up the deficiency of the reduction of beams of concrete ductility and rigidity when pre-stressed carbon fiber plate is reinforced; On the other hand, the carbon fiber board of Shi Hanzhang, beams of concrete is made to become the component of an active force, after strengthening construction completes, namely beam body starts stress, the bearing capacity making component is greatly improved, simultaneously, prestressing force also makes the crack on beams of concrete reduce, and even closes, and reduces reinforcing bar by the corrosion function suffered by crack, improve the durability of beams of concrete, improve the holistic resistant behavior of beams of concrete, additionally, in the use procedure in beams of concrete later stage, can according to the situation of loss of prestress, Shi Hanzhang again. Therefore, utilize above two combination of materials reinforced concrete beam both can increase substantially the anti-bending bearing capacity of beams of concrete, the rigidity of beams of concrete, ductility, globality and reliability can be improved again, and easy construction, economic and practical, have broad application prospects in civil engineering structure field of reinforcement.
Claims (7)
1. the anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate, it is characterised in that comprise the steps:
A) beams of concrete surface treatment, first closes beams of concrete surface crack or embedding processes, and cuts laitance layer, be completely exposed the new face of concrete after reaching curing time; Secondly, carry out dabbing process with cutting the new face of the axe concrete to exposing, form smooth matsurface; Again, with the scum silica frost on water cleaning concrete surface, dust; Finally uneven more serious surface epoxy resin mortar is repaired;
B) blanking of steel plate and process, first according to steel plate design size, adopts factory's automatically or semi-automatically cutting method to cut, the defect such as the cut edge smooth surface of the steel plate after molding, impulse-free robustness, seaming and warpage; Then, being polishing to present metallic luster with polisher to steel plate bond area, polishing lines should be vertical with steel plate Impact direction, and makes steel plate bond area have roughness, is eliminated rust to presenting metallic luster in plate exposure face, and make plate exposure face keep dry; Finally the waveform tooth plate of fixing end and the fixed block of stretching end are welded on the corresponding position of the non-bond area of steel plate;
C) stickup and fixation steel plate, spread upon on processed good beams of concrete bottom surface and steel plate bond area by adhesive simultaneously; Then by steel sticking in precalculated position, after steel sticking is good, the pressure of 0.05��0.1MPa need to be applied on its surface, make adhesive just be extruded as from the side seam of steel plate suitable, then make adhesive solidify more than 20 DEG C under room temperature 24 hours, during solidification, steel plate must not be had any disturbance; Finally, remove surface of steel plate dirt and rust staining, plate exposure face is brushed twice rust phenolphthalein antirust paint then twice Lycoperdon polymorphum Vitt finish paint of outer painting;
D) paste and fixing U-shaped steel plate hoop, carry out in the termination, two ends of steel plate holing, clear hole and injecting glue, then paste U-shaped steel plate hoop with adhesive respectively, and undertaken strengthening anchoring by bolt;
E) stretch-draw of pre-stressed carbon fiber plate and anchoring, according to design size cutting pre-stressed carbon fiber plate, and the two ends of the pre-stressed carbon fiber plate cut are respectively placed between base plate and the cover plate of anchored end waveform tooth plate and stretching end waveform tooth plate, and make the pre-stressed carbon fiber plate longitudinal axis centrage by waveform tooth plate, by the screw rod on stretching end waveform tooth plate through the through hole on fixed block, at external part sheathed fixing nut, counter-force block and the counter-force nut successively of screw rod; Then with spanner, each nut of waveform tooth plate is applied corresponding torsion, it is ensured that the effectively anchoring of carbon fiber board is not cut off again carbon filament by waveform tooth plate; Being placed in by jack between fixed block and counter-force block, after tightening counter-force nut, stretch-draw jack is to control stress for prestressing step by step; After stretch-draw completes, screw up with a wrench fixing nut, removal jack; Finally, whitewashing cementitious composite mortar as overcoat on pre-stressed carbon fiber plate surface and waveform tooth plate, what complete beams of concrete is anti-bend reinforced.
2. a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate according to claim 1, it is characterised in that described step A) described in laitance layer thickness be 2mm��3mm, the described dabbing degree of depth is not less than 6mm.
3. a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate according to claim 1, it is characterized in that, described step A) in be additionally included in be completely exposed the new face of concrete after be purged the position that there is cavity blemish processing.
4. a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate according to claim 1, it is characterised in that described step C) described in the smearing thickness of adhesive be 3��5mm, thick middle both sides are thin.
5. a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate according to claim 1, it is characterized in that, described step C) in pasted steel plate after also need to knock steel plate gently, as without cavity sound, expression has been pasted closely knit, if there being empty sound, indicate air, do not paste closely knit, steel plate should be peeled, re-paste after mending adhesive.
6. a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate according to claim 1, it is characterised in that described step D) in first verify the reinforcement location in beams of concrete before boring, and mark, release the position of boring.
7. a kind of anti-bend reinforced method of beams of concrete based on steel plate-pre-stressed carbon fiber plate according to claim 1, it is characterized in that, described anchored end waveform tooth plate and stretching end waveform tooth plate all include cover plate and base plate, the corresponding inner side end of described cover plate and base plate is wavy surface, base plate is connected by Bolt to position with cover plate, and the end face outside of the base plate of stretching end waveform tooth plate is provided with screw rod.
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| CN106320191A (en) * | 2016-08-31 | 2017-01-11 | 西安公路研究院 | Pre-tensioning steel wire and polymer mortar externally-added layer reinforcing device |
| CN106382017A (en) * | 2016-11-18 | 2017-02-08 | 南京工业大学 | Externally bonded pre-tensioned FRP (Fiber Reinforced Plastic) reinforcement beam and plate or combined structure thereof |
| CN106639354A (en) * | 2017-01-10 | 2017-05-10 | 武汉理工大学 | Method for reinforcing concrete beam shear-bearing capacity of steel plate and pre-stressed carbon fiber cloth |
| CN107632069A (en) * | 2017-09-29 | 2018-01-26 | 长安大学 | A kind of concrete beam strengthening steel sheet peeling off detecting system and detection method |
| CN109537475A (en) * | 2018-11-26 | 2019-03-29 | 山东交通学院 | The method and ruggedized construction of bent cap reinforcing are carried out using carbon fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106320191A (en) * | 2016-08-31 | 2017-01-11 | 西安公路研究院 | Pre-tensioning steel wire and polymer mortar externally-added layer reinforcing device |
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| CN106639354B (en) * | 2017-01-10 | 2018-12-18 | 武汉理工大学 | The method of steel plate and prestressed carbon cloth reinforced beams of concrete shear-carrying capacity |
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