CN101929131A - Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab - Google Patents
Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab Download PDFInfo
- Publication number
- CN101929131A CN101929131A CN 201010275479 CN201010275479A CN101929131A CN 101929131 A CN101929131 A CN 101929131A CN 201010275479 CN201010275479 CN 201010275479 CN 201010275479 A CN201010275479 A CN 201010275479A CN 101929131 A CN101929131 A CN 101929131A
- Authority
- CN
- China
- Prior art keywords
- reinforcing
- reinforcement
- concrete
- composite mortar
- construction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to a method for reinforcing a bonded prestressing force of a transversely tensioning epoxy coating reinforcing steel bar of a concrete beam slab, which relates to the reinforcement of reinforced concrete and prestressed concrete bridges and is suitable for the reinforcement of house buildings and other building structures. In a prestressing force reinforcing technique of the invention, a novel transversely tensioning corrosion-resistant epoxy coating reinforcing steel bar is used for substituting for a longitudinally tensioning high-strength steel strand or common hot-rolled reinforcing steel bar and a transversely clamping device is used for substituting transverse tensioning for longitudinal tensioning, so that low-cost composite mortar or concrete can be used for substituting for high-cost high-performance tensile composite mortar or polymer mortar to perform a structure treatment and construction process, and the problems of low utilization efficiency of materials, high reinforcing cost and inconvenient reinforcing construction are solved.
Description
Technical field
The invention belongs to the building reinforcement technique field, the particularly reinforcing of steel concrete and Prestressed Concrete Bridges is also applicable to the reinforcing of building construction and other fabric structures.
Background technology
After bridge construction was built up, in long-term operation process, because the continuous deterioration of the performance of effect, overload and the constructional materials of environment itself causes bridge construction that various damages have taken place, the supporting capacity of bridge constantly descended.After supporting capacity drops to a certain degree, can not satisfy instructions for use, then must carry out consolidation process, to recover its function of use to bridge construction.
In active service concrete-bridge structural strengthening technology, it is one of Technology Bridge Strengthening means that bonded prestress is reinforced.The way of this technology is at present: arrange minor diameter steel strand or common hot-rolled reinforced bar on the beam body that is reinforced, adopt conventional prestressed reinforcement end tension technology to carry out prestressed reinforcement stretch-draw, prestressed reinforcement is anchored on the anchor device at two ends, anchor device through particular design be reinforced the beam body and connect into integral body, thereby realize the prestressing force of beam body is applied, the tension of spray high-performance then composite mortar covers prestressed reinforcement, is formed with the binding prestress reinforcement system.In this reinforcement means, the cost of composite mortar accounts for the larger specific gravity of whole reinforcement cost.
This Technology Bridge Strengthening is owing to adopted prestressed reinforcement thought, and its reinforcing theory is advanced, has obtained concrete application on the part bridge at home and abroad, but owing to there is following problem, has limited the development of this technology and applies:
1. be conventional plain bars owing to applying prestressed reinforcing bar, the anticorrosive durability of reinforcing bar itself is relatively poor.Be to ensure the durability of ruggedized construction, the tensile property and the adhesive property of the composite mortar (or polymer mortar) of back spray are had relatively high expectations.Therefore must adopt high performance tension composite mortar (or polymer mortar) to come prestressed reinforcement is protected, be formed with the binding prestress system, and this high performance material price costliness cause reinforcement cost higher, economic performance is relatively poor.
2. the stretch-draw to prestressed reinforcement is to adopt traditional jack end tension technology.This technology stretch-draw workload is big, speed is slow, strengthening construction efficient is low, and to the requirement of strength height of anchor device, requires the anchor head rear that enough stretch-draw spaces must be arranged, and is unfavorable for prestressed reasonable Arrangement, and construction is extremely inconvenient.
Because the existence of these shortcomings has limited further applying of this advanced reinforcing technique.
Summary of the invention
The objective of the invention is, adopt a kind of novel transverse stretching to have the epoxy-coated reinforcement bonded prestress reinforcing technique of anti-corrosion protection, to substitute the high strength steel strand or the common hot-rolled reinforced bar of vertical stretch-draw; And then can use low-cost composite mortar or concrete, and substituting the high-performance tension composite mortar of lattice costliness or the structure of polymerization mortar and handle and construction technology, material use efficient is low, reinforcement cost is high, the problem of strengthening construction inconvenience to solve.
Realize that technical scheme of the present invention is:
This invention is used for reinforcing or the reinforcing of sloping section shear resistant capacity in the normal section bending bearing capacity of labour concrete bridge girder construction.When reinforcing design, adopt the structure Design and Calculation principle of " highway bridge reinforcing design standard " JTG/TJ22-2008, the prestressing force consumption design formulas that provides of standard calculates the needed prestressed reinforcement section area of normal section anti-bending bearing capacity or sloping section shear-carrying capacity like this.
Then, select for use the epoxy-coated reinforcement that has self-protection, replace the plain bars of use at present, thereby reduce the dependence of structure durability, reduce reinforcement cost the high-performance composite mortar as prestressed reinforcement.And, adopt transverse stretching to replace longitudinal end stretch-draw, help prestressed reinforcement and arrange, simplify stressing sequence, improve stretch-draw efficient.
The present invention is achieved in that in the normal section bending bearing capacity reinforcing process to concrete freely-supported hollow slab beam as follows:
(1) at the two ends in beam reinforcement district the anchor plate bar is set, the anchor plate bar adopts the building structure glue bond with being reinforced concrete freely-supported hollow slab beam, and adds press fit with the method for anchoring;
(2), the two ends that scribble epoxy-coated reinforcement are welded on the anchor plate bar that the two ends in beam reinforcement district are provided with by the rebar spacing of design;
(3) adopt horizontal gripping mechanism or clamp that adjacent two reinforcing bars are laterally strained and be broken line type, and fix with horizontal jig;
(4) material of selection composite mortar or concrete cover, reinforcement presstressed reinforcing steel are arranged in the normal section shearing resistance of the tensile region, bottom surface of beam body and reinforce, and should adopt the composite mortar topping of gunite construction.
Adopt the present invention to have the epoxy-coated reinforcement of anti-corrosion protection; can reduce back spray composite mortar or concrete crack resistance requirement; can allow to reinforce the crack that 0.2mm appears being not more than in the back member, can use relatively low composite mortar of tensile strength or concrete to substitute expensive high-performance tension composite mortar or polymerization mortar.
Reinforcement means of the present invention can be used for the reinforcing of multiple bridge construction and building structure.
Major advantage of the present invention is:
(1) the bonded prestress reinforcement system belongs to initiatively Scheme of Strengthening, with the passive Scheme of Strengthening contrast of still a large amount of affixing steel plates that adopt or high-strength compound cloth (plate) at present, fundamentally solved the inadequate natural endowment of " adding supporting material strain (stress) after the bridge strengthening lags behind ", the utilization ratio that adds supporting material after having improved has been improved strenthening member plasticity service behaviour.
(2) employing has the epoxy-coated reinforcement of anti-corrosion protection; substitute high strength steel strand or common hot-rolled reinforced bar and do presstressed reinforcing steel; the crack resistance that can reduce back spray composite mortar (or concrete) requires (even can allow to reinforce the crack that 0.2mm appears being not more than in the back member); can substitute expensive high-performance tension composite mortar (or polymerization mortar) by the relatively low composite mortar (or concrete) of tensile strength, reinforcement cost is reduced significantly.
(3) owing to adopt horizontal gripping mechanism, substitute vertical stretch-draw with transverse stretching, cancelled the ground tackle of complex structure, the presstressed reinforcing steel anchoring is simple, and stretch-draw is convenient, and loss of prestress is little, adds the supporting material utilization ratio after having improved.
Description of drawings
Fig. 1 reinforces schematic diagram for the present invention to concrete freely-supported hollow slab beam normal section intensity
Fig. 2 reinforces schematic diagram for the present invention to tee girder sloping section intensity
Fig. 3. be the schematic cross-sectional view of tee girder shown in Figure 2
The specific embodiment
Be described in detail specific embodiments of the invention in conjunction with the accompanying drawings
Normal section bending bearing capacity reinforcing process to concrete freely-supported hollow slab beam is as follows: (see figure 1)
1) detects and the supporting capacity assessment report according to bridge, determine the reinforcing area of beam body 5.
2) according to " highway bridge reinforcing design standard " JTG/TJ22-2008, calculate corresponding prestressed reinforcement section area.
3) select the epoxy-coated reinforcement 3 of suitable diameter as standby prestressed reinforcement material.
4) the steel plate bar 1 of making prestressed reinforcement anchoring, the thickness of steel plate bar is not less than 10mm, and length equals the peak width of reinforcement body 5 arrangement prestress.
5) the anchor plate bar of making 1 is installed to the two ends of the design attitude of stabilization zone.Steel plate bar 1 adopt construction structure glue bonding be reinforced concrete freely-supported hollow slab beam 5, and with bolt or expansion bolt or holdfast pressurization anchoring.
6) according to step 1) the reinforcing area of definite beam body 5, determine to reinforce the prestressed reinforcement quantity of usefulness, and be arranged in reinforcing area at a certain distance, the two ends of epoxy-coated reinforcement 3 are welded on the anchor plate bar 1 at reinforcing area two ends.
7) stretch-draw of prestressed reinforcement is adopted transverse stretching or is laterally tightened technology, adopt horizontal gripping mechanism or clamp 2 that adjacent two reinforcing bars 3 are laterally strained and be broken line type, and fix with horizontal jig, the reinforcing bar angle of slope of the proof stress of transverse stretching after by stretch-draw demarcated, and the numerical value of proof stress should be determined by the prestressing force designing requirement.
8), select the protective layer thickness and the job practices of composite mortar or concrete 4 according to the demand of anti-crack and the condition of work of footing.Anti-bend reinforced for normal section; prestressed reinforcement is arranged in the tensile region, bottom surface of beam body 5; need to adopt the composite mortar or the concrete 4 of gunite construction; prestressed reinforcement 3 is covered; the reinforcement presstressed reinforcing steel is arranged in the tensile region, bottom surface of beam; finish the topping construction, finally realize the bonded prestress reinforcing.
Be used to reinforce the sloping section intensity (Fig. 2, shown in Figure 3) of tee girder and box girder bridge
The sloping section shearing resistance of tee girder and box girder bridge 5 is reinforced, and construction sequence is similar to embodiment 1 with method.Different is, in construction sequence 8) method of MR medium reinforcing prestressed reinforcement 3, be the both sides (or in case) that are arranged in web, can adopt and smear platen press construction composite mortar (or concrete) 4 toppings.
The freely-supported of multispan simply supported slab, beam bridge changes continuously to be reinforced
The freely-supported of multispan simply supported slab, beam bridge 5 changes continuity method to be reinforced, and construction sequence is similar to embodiment 1 with method.Different is, in construction sequence 8) method of MR medium reinforcing prestressed reinforcement, be that the adjacent Dun Ding that strides arranges reinforcement presstressed reinforcing steel 3 in the centre, directly build the concrete 4 that is mixed with the cement based crystalline waterproof material behind the reinforced bar stretching thereon and mat formation layer to strengthen the crack resistance of bridge floor.
Claims (8)
1. force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab bonded prestress reinforcement means is characterized in that:
Normal section bending bearing capacity reinforcement means to concrete freely-supported hollow slab beam is as follows,
1) at the two ends in beam reinforcement district the anchor plate bar is set, the anchor plate bar adopts the building structure glue bond with being reinforced concrete freely-supported hollow slab beam, and adds press fit with the method for anchoring;
2), the two ends that scribble epoxy-coated reinforcement are welded on the anchor plate bar that the two ends in beam reinforcement district are provided with by the rebar spacing of design;
3) adopt horizontal gripping mechanism or clamp that adjacent two reinforcing bars are laterally strained and be broken line type, and fix with horizontal jig;
4) material of selection composite mortar or concrete cover, reinforcement presstressed reinforcing steel are arranged in the normal section shearing resistance of the tensile region, bottom surface of beam body and reinforce, and adopt the composite mortar topping of gunite construction.
2. prestress strengthening method according to claim 1; it is characterized in that: the material of selected composite mortar of step 4) or concrete cover; can be relatively low composite mortar of tensile strength or concrete; can reduce crack resistance requirement, and allow to reinforce the crack that 0.2mm appears being not more than in the back member back spray composite mortar (or concrete).
3. prestress strengthening method according to claim 1 is characterized in that: the two ends in step 1) beam reinforcement district are provided with the anchor plate bar, and described steel plate bar (1) thickness is not less than 10mm, and length equals the peak width of reinforcement body (5) arrangement prestress.
4. prestress strengthening method according to claim 1, it is characterized in that: the stretch-draw of prestressed reinforcement is adopted transverse stretching or is laterally tightened technology, the reinforcing bar angle of slope of the proof stress of transverse stretching after by stretch-draw demarcated, and the numerical value of proof stress should be determined by the prestressing force designing requirement.
5. according to claim 1,3 described prestress strengthening methods, it is characterized in that: the anchor plate bar be reinforced concrete freely-supported hollow slab beam and adopt the building structure glue bond, and adding press fit with the method for anchoring, its anchoring process can be with bolt or expansion bolt or holdfast pressurization anchoring.
6. prestress strengthening method according to claim 1; it is characterized in that: the sloping section shearing resistance to tee girder and box girder bridge is reinforced; in construction sequence 4) method of MR medium reinforcing prestressed reinforcement (3); be to be arranged in the both sides or case of web, adopt and smear platen press construction composite mortar or concrete (4) topping.
7. prestress strengthening method according to claim 1, it is characterized in that: the freely-supported to multispan simply supported slab, beam bridge changes the continuity method reinforcing, in construction sequence 4) method of MR medium reinforcing prestressed reinforcement, be to adopt adjacent Dun Ding layout reinforcement prestressed reinforcement (3) of striding, directly build the concrete (4) that is mixed with the cement based crystalline waterproof material behind the reinforced bar stretching thereon and mat formation layer to strengthen the crack resistance of bridge floor in the centre.
8. according to claim 1,6 or 7 described prestress strengthening methods, it is characterized in that: this reinforcement means can be used for the reinforcing of multiple bridge construction or building structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102754791A CN101929131B (en) | 2010-09-08 | 2010-09-08 | Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102754791A CN101929131B (en) | 2010-09-08 | 2010-09-08 | Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101929131A true CN101929131A (en) | 2010-12-29 |
| CN101929131B CN101929131B (en) | 2012-07-04 |
Family
ID=43368533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102754791A Expired - Fee Related CN101929131B (en) | 2010-09-08 | 2010-09-08 | Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101929131B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362319A (en) * | 2013-07-26 | 2013-10-23 | 朱奎 | Construction method for strengthening perforated plate and floor slab |
| CN104453271A (en) * | 2015-01-08 | 2015-03-25 | 兰州理工大学 | Method for reinforcing bent crack of cantilever plate structure |
| CN108708304A (en) * | 2018-08-10 | 2018-10-26 | 山东交通学院 | A kind of compound Shear Strengthening construction of old T-type beam bridge steel wire rope MPC and construction method |
| CN108755394A (en) * | 2018-07-11 | 2018-11-06 | 广州大学 | A kind of method of presstressed reinforcing steel reinforcement bridge abnormity pier stud |
| CN109322502A (en) * | 2017-07-31 | 2019-02-12 | 湖南大学 | A kind of high tensile reinforcement ultra-high performance concrete plate reinforced for flexural member |
| CN111101729A (en) * | 2019-12-31 | 2020-05-05 | 中国矿业大学 | Floor slab reinforcing method |
| CN112854024A (en) * | 2021-01-10 | 2021-05-28 | 山西省交通新技术发展有限公司 | Construction method of bonded prestressed structure for reinforcing hollow slab bridge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0416675A (en) * | 1990-05-10 | 1992-01-21 | Fuji P S:Kk | Prestressed concrete construction method with non-ferrous wire rod and device thereof |
| CN1727599A (en) * | 2004-07-27 | 2006-02-01 | 柳州欧维姆机械股份有限公司 | No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method |
| CN1804333A (en) * | 2006-01-20 | 2006-07-19 | 哈尔滨工业大学 | Concrete and prestressed concrete beam with transition region |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4016675B2 (en) * | 2002-03-07 | 2007-12-05 | 日産自動車株式会社 | Internal combustion engine |
-
2010
- 2010-09-08 CN CN2010102754791A patent/CN101929131B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0416675A (en) * | 1990-05-10 | 1992-01-21 | Fuji P S:Kk | Prestressed concrete construction method with non-ferrous wire rod and device thereof |
| CN1727599A (en) * | 2004-07-27 | 2006-02-01 | 柳州欧维姆机械股份有限公司 | No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method |
| CN1804333A (en) * | 2006-01-20 | 2006-07-19 | 哈尔滨工业大学 | Concrete and prestressed concrete beam with transition region |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362319A (en) * | 2013-07-26 | 2013-10-23 | 朱奎 | Construction method for strengthening perforated plate and floor slab |
| CN103362319B (en) * | 2013-07-26 | 2016-03-16 | 朱奎 | A kind of construction method of reinforcing porous plate floor |
| CN104453271A (en) * | 2015-01-08 | 2015-03-25 | 兰州理工大学 | Method for reinforcing bent crack of cantilever plate structure |
| CN104453271B (en) * | 2015-01-08 | 2016-08-24 | 兰州理工大学 | The reinforcement means in cantilevered plate structural bending type crack |
| CN109322502A (en) * | 2017-07-31 | 2019-02-12 | 湖南大学 | A kind of high tensile reinforcement ultra-high performance concrete plate reinforced for flexural member |
| CN108755394A (en) * | 2018-07-11 | 2018-11-06 | 广州大学 | A kind of method of presstressed reinforcing steel reinforcement bridge abnormity pier stud |
| CN108755394B (en) * | 2018-07-11 | 2020-07-31 | 广州大学 | Method for reinforcing special-shaped pier column of bridge by using prestressed tendons |
| CN108708304A (en) * | 2018-08-10 | 2018-10-26 | 山东交通学院 | A kind of compound Shear Strengthening construction of old T-type beam bridge steel wire rope MPC and construction method |
| CN111101729A (en) * | 2019-12-31 | 2020-05-05 | 中国矿业大学 | Floor slab reinforcing method |
| CN111101729B (en) * | 2019-12-31 | 2021-04-30 | 中国矿业大学 | Floor slab reinforcing method |
| CN112854024A (en) * | 2021-01-10 | 2021-05-28 | 山西省交通新技术发展有限公司 | Construction method of bonded prestressed structure for reinforcing hollow slab bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101929131B (en) | 2012-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101929131B (en) | Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab | |
| CN107165272A (en) | Prestressing force assembly concrete frame joint attachment structure and its construction method | |
| CN207194146U (en) | Prestressing force assembly concrete frame joint attachment structure | |
| CN102704386B (en) | Prefabricated component assembly type segment assembling corrugated steel web RPC (Reactive Powder Concrete) combination box girder and method therefor | |
| CN201459716U (en) | Retard-bonded or unbonded post-tensioned prestressing filling pile | |
| Seible et al. | Kings stormwater channel and I-5/Gilman bridges, USA | |
| CN203741730U (en) | T-shaped bridge reinforcing structure | |
| CN207553438U (en) | Tension prestress concrete composite beam altogether | |
| CN102926331A (en) | Concrete hollow slab bridge strengthened by transverse integral clamping connection | |
| CN108086592A (en) | A kind of detached column and construction method | |
| CN107217597A (en) | A kind of prestressed concrete bridge face is seamlessly connected the construction method of plate | |
| CN104100100B (en) | The method of Tests of Reinforced Concrete Beams Strengthened With Cfrp-laminate is drawn in micro-varicose | |
| CN110029777B (en) | Prestressed FRP rib fiber high-strength lightweight aggregate concrete beam and preparation method thereof | |
| CN105544415A (en) | Concrete bridge reinforcing method and structure | |
| CN214462857U (en) | Reinforced concrete beam reinforcing construction joint | |
| JP3321694B2 (en) | Repair / reinforcement method of reinforced concrete slab upper surface | |
| CN106836021B (en) | A kind of pre-stress FRP sheet material Shear Strengthening beams of concrete experimental provision | |
| CN206887745U (en) | A kind of section assembling FRP using SMA strengthens concrete pier of steel tube | |
| CN202787050U (en) | Novel prestress carbon fiber sheet anchor device | |
| CN210976324U (en) | Prestressed composite-ultra-high performance concrete composite beam | |
| CN210104592U (en) | Prestressed composite reinforcing structure of pier bent cap | |
| CN204782046U (en) | FRP cloth material resists hardened system that collapses with building that anchor steel sheet combines | |
| CN201915557U (en) | Reinforced concrete beam slab based on preset cast-in-place construction of thermal-insulation plate at bottom of beam slab | |
| CN214246715U (en) | Box type steel pipe reinforced concrete frame beam | |
| CN210766389U (en) | Super high performance concrete dense ribbed slab without transverse ribs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20120908 |