CN101929131B - 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
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- CN101929131B CN101929131B CN2010102754791A CN201010275479A CN101929131B CN 101929131 B CN101929131 B CN 101929131B CN 2010102754791 A CN2010102754791 A CN 2010102754791A CN 201010275479 A CN201010275479 A CN 201010275479A CN 101929131 B CN101929131 B CN 101929131B
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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.Way that at present should technology is: on the beam body that is reinforced, arrange minor diameter steel strand or common hot-rolled reinforced bar; 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 development that should 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 is expensive, causes reinforcement cost higher, economic performance is relatively poor.
2. the stretch-draw to prestressed reinforcement is to adopt traditional jack end tension technology.This technological stretch-draw workload is big, speed slow, strengthening construction efficient is low, and high to the requirement of strength 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 the structure that substitutes expensive high-performance tension composite mortar of lattice or polymerization mortar is handled and construction technology, and material use efficient is low, reinforcement cost is high to solve, the problem that strengthening construction is inconvenient.
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 following:
(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 that adjacent two reinforcing bars are laterally strained and be broken line type, and fix with horizontal jig;
(4) select composite mortar or the concrete material as the presstressed reinforcing steel topping, the reinforcement presstressed reinforcing steel is arranged in the tensile region, bottom surface of beam body, and composite mortar or concrete cover should adopt the 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 sketch map for the present invention to concrete freely-supported hollow slab beam normal section intensity
Fig. 2 reinforces sketch map 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 embodiment of the present invention in conjunction with accompanying drawing
Normal section bending bearing capacity reinforcing process to concrete freely-supported hollow slab beam is following: (see figure 1)
1) detects and the supporting capacity assessment report according to bridge, confirm 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) epoxy-coated reinforcement 3 of selecting suitable diameter is as subsequent use 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 employing construction structure glue is bonding and 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, confirm to reinforce the prestressed reinforcement quantity of usefulness, and by certain pitch arrangement at reinforcing area, 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 confirmed 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; The construction of completion topping finally realizes 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 with embodiment 1 with method.Different is, in construction sequence 8) in arrange reinforcement prestressed reinforcement 3 method, 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 with embodiment 1 with method.Different is; In construction sequence 8) in arrange the reinforcement prestressed reinforcement method; 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 above that and mat formation layer to strengthen the crack resistance of bridge floor.
Claims (10)
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 following,
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 that adjacent two reinforcing bars are laterally strained and be broken line type, and fix with horizontal jig;
4) select composite mortar or concrete as the presstressed reinforcing steel protective layer material, the reinforcement presstressed reinforcing steel is arranged in the tensile region, bottom surface of beam body, and composite mortar or concrete cover adopt the 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; Be relatively low composite mortar of tensile strength or concrete; Can reduce back spray composite mortar or concrete crack resistance requirement, and allow to reinforce the crack that 0.2mm appears being not more than in the back member.
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: transverse stretching is adopted in the stretch-draw of prestressed reinforcement or laterally chucking is technological; 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 confirmed by the prestressing force designing requirement.
5. according to claim 1 or 3 described prestress strengthening methods, it is characterized in that: 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, and its anchoring process is with 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) in arrange reinforcement prestressed reinforcement (3) method; 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) in arrange the reinforcement prestressed reinforcement method; Be that the adjacent Dun Ding that strides arranges reinforcement prestressed reinforcement (3) in the middle of being employed in, directly build the concrete (4) that is mixed with the cement based crystalline waterproof material behind the reinforced bar stretching above that and mat formation layer to strengthen the crack resistance of bridge floor.
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.
9. prestress strengthening method according to claim 1 is characterized in that: in construction sequence 3) described in horizontal gripping mechanism be clamp.
10. prestress strengthening method according to claim 5 is characterized in that: described bolt is an expansion bolt.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN101929131A CN101929131A (en) | 2010-12-29 |
| CN101929131B true CN101929131B (en) | 2012-07-04 |
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| CN103362319B (en) * | 2013-07-26 | 2016-03-16 | 朱奎 | A kind of construction method of reinforcing porous plate floor |
| 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 |
| 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 |
| 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 |
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| 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 |
| JP4016675B2 (en) * | 2002-03-07 | 2007-12-05 | 日産自動車株式会社 | Internal combustion engine |
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| JP2909556B2 (en) * | 1990-05-10 | 1999-06-23 | 株式会社富士ピー・エス | Prestressed concrete method using non-ferrous wire and its equipment. |
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Patent Citations (3)
| 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 |
| 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 |
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