CN102587689B - Repairing and strengthening method for existing reinforced concrete beam-column joints - Google Patents
Repairing and strengthening method for existing reinforced concrete beam-column joints Download PDFInfo
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- CN102587689B CN102587689B CN201210092635.XA CN201210092635A CN102587689B CN 102587689 B CN102587689 B CN 102587689B CN 201210092635 A CN201210092635 A CN 201210092635A CN 102587689 B CN102587689 B CN 102587689B
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Abstract
The invention discloses a repairing and strengthening method for existing reinforced concrete beam-column joints. The method includes steps of building up a platform around a repaired concrete frame column, reasonably constructing the steel tube scaffold of the platform, allowing the platform to be able to break down the stress load of the concrete beam-column joints, using a jacking support to support the beam above the concrete frame column, using an underpinning jack to jack and restore the beam bottom, when the beam reaches a required height, stretching the deformed top of the concrete frame column in the opposite direction to restore an original shape, repairing and solidly filling each hole on the concrete frame column and the beam-column joints, and pasting carbon fiber to reinforce and repair the cracks of the frame beam and frame column until all the flaws of the frame beam and frame column are repaired.
Description
Technical field
The invention belongs to civil engineering existing building strengthening reconstruction field, particularly a kind of reparation of existing reinforced concrete bean column node and reinforcement means.
Background technology
The restorative procedure of traditional reinforced concrete structured beam post mainly contains: the methods such as Covered with Angles, epoxy glue sealing, affixing carbon fabric.It is lighter that Covered with Angles method is mainly used in concrete column breakage, it is the situation that distortion does not appear in concrete column, and what Covered with Angles method was mainly repaired is the breakage of beam, post corner angle, be not suitable for the situation that concrete beam and column node destroys, more can not recover the distortion of concrete beam and column node and position; Epoxy glue sealing method is mainly applicable to the situation of having relatively high expectations for fire-protection rating, and epoxy glue weight is large easily to the concrete column after repairing, causes secondary damaged, can not repair the distortion of beam column built from concrete; The method of affixing carbon fabric is applicable to common small load structure or member, and adopts affixing carbon fabric can not significantly improve the bulk strength of structure or member.
In summary it can be seen, when larger doghole, concrete capital appear in steel concrete capital and Vierendeel girder junction, have distortion and displacement, and there is the building disease in crack, many places in beam, post, by above method, can not solve completely.
Summary of the invention
The defect or the deficiency that for prior art, exist, the object of the invention is to: in the situation that guaranteeing that existing concrete frame beam, post are not removed and other members are not damaged, how concrete frame capital and Vierendeel girder junction, in the situation that larger doghole, the frame concrete capital forming at the bottom of beam during casting beams concrete exists many places on distortion and beam, post to occur crack, are repaired and to be reinforced existing building frame concrete beam column node.
In order to realize above-mentioned technical assignment, the present invention adopts following technical scheme to be achieved:
The reparation of existing reinforced concrete concrete frame joint and a reinforcement means, the method comprises the following steps:
(1) build job platform: in existing building concrete frame trestle surrounding, and be positioned at high 2/3 place of this concrete frame trestle and build job platform, job platform adopts fastener type steel pipe frame to set up, steel pipe frame be connected to fastener, below job platform, lay two-layer channel-section steel, around job platform central part, be arranged to the intensive stabilization zone of cross, the steel pipe frame vertical rod of this intensive stabilization zone in length and breadth spacing is 400mm, in intensive stabilization zone, surrounding is arranged to respectively common stabilization zone, and common stabilization zone steel pipe frame vertical rod in length and breadth spacing is 800mm;
(2) beam-ends supporting: four beam-ends that utilize the crossbeam of square crossing above lifting-up support supporting and concrete frame trestle on job platform along concrete frame trestle surrounding;
(3) unloading: the load that removal concrete column supports;
(4) at the bottom of concrete frame beam, jacking resets: below each concrete frame beam-ends lifting-up support, both sides arrange two and underpin jack, utilize at the uniform velocity four beam-ends of the crossbeam of jacking concrete frame trestle top square crossing of jack, when the crossbeam bottom hoisting depth of concrete frame trestle top square crossing reaches former designing requirement height+3mm, stop four beam-ends of jack jacking, then adopt steel cushion block that jack is replaced;
(5) distortion of concrete frame trestle resets: at concrete frame trestle capital, utilize guide chain to stretch and draw along the distortion of concrete frame trestle capital in the other direction, until concrete frame trestle capital is eliminated lateral deformation;
(6) cleaning doghole: the crisp broken concrete of concrete frame trestle capital and concrete frame beam junction is removed, until expose the new face of hard structure;
(7) concrete frame trestle is repaired: adopt high-strength composite grout successively the doghole of concrete frame column top to be repaired, while repairing doghole closing in, adopt the real doghole mouth of quick setting and rapid hardening type strength cement-based grouting material plug, keep grouting material in moisture state, curing concrete frame column 2-3d;
(8) affixing carbon fabric reinforcement: to concrete frame beam, place, concrete frame trestle crack affixing carbon fabric, the mass area ratio of carbon cloth is 300g/m
2adopt epoxide-resin glue to paste, at concrete frame beam, concrete frame trestle joints, concentrate place, adopt the wide carbon fiber hoop of 500mm to reinforce, for the horizontal fracture at concrete frame trestle middle part, adopting diameter is that 100mm spacing is that the carbon fiber hoop of 200mm is reinforced;
(9) remove job platform and lifting-up support: by after the concrete frame beam after carbon fiber reinforcement, concrete frame trestle maintenance 7d, job platform and lifting-up support are removed.
The present invention also has following technical characterstic:
The high-strength composite grout adopting in step (7) concrete frame trestle repair process and the water/binder ratio of quick setting and rapid hardening type strength cement-based grouting material are no more than 0.4, and intensity reaches C45.
The present invention compared with prior art, not changing, not damaging on the basis of node component self intensity, repairs node, and then to the reparation that resets of existing concrete frame trestle and beam.Utilize the column cap strength ratio actual design intensity level after the present invention reinforces existing concrete frame trestle to increase 5MPa, meet requirement of strength; Beam after reparation, the axis of post meet design requirement.
Accompanying drawing explanation
Fig. 1 is jack-up system schematic diagram when jacking resets at the bottom of crossbeam supporting of the present invention and beam.
Fig. 2 is carbon fiber reinforcement operation chart of the present invention.
Fig. 3 is that concrete frame trestle job platform steel frame pipe of the present invention is arranged schematic diagram, and wherein Fig. 3 a is that concrete frame trestle steel pipe frame is arranged schematic top plan view, and Fig. 3 b is concrete frame trestle operation post steel pipe frame general arrangement schematic.
Below in conjunction with accompanying drawing, particular content of the present invention is described in further detail.
The specific embodiment
The present invention builds job platform around by the concrete frame trestle being repaired, by the reasonable Arrangement that job platform steel pipe frame is built, make job platform can scientificlly and effectively decompose the stress load of concrete frame trestle node, by jacking frame, the crossbeam of concrete frame trestle top is carried out to supporting, and carry out jacking reset by underpining jack at the bottom of by crossbeam beam.When crossbeam jacking reaches hoisting depth, the deformation at concrete frame capital top is carried out to opposite direction stretching and reset, eliminate the deformation of frame concrete top.For the doghole of concrete frame trestle and crossbeam Nodes, successively repair plug real.Finally sticking carbon fiber reinforcement recovery is carried out in the crack of concrete frame beam, post, until that whole concrete frame beam, post all defect are repaired is complete.
Embodiment:
Below one of them embodiment that inventor provides, Baoji existing building, its concrete frame column cross-section size is 600*600mm, concrete column height is 9000mm, concrete column intensity is C40, because the reinforcing bar at concrete beam and column node place is too intensive, in the process of concreting, form larger survey doghole, after the imposed load of concrete column top, node region wrecks, the capital about 60mm of offset axis eastwards wherein, and there is many places horizontal fracture in the post altitude range of concrete column, stitch the wide 0.2-0.3mm that is about, the low crack in various degree that also occurred of beam.
The problem existing for above-mentioned existing building, follows technical scheme of the present invention, and according to following steps, the concrete frame beam of this existing building, post node is repaired and reinforced,
Step 1: build job platform: in existing concrete frame trestle surrounding, and be positioned at high 2/3 place of this concrete frame trestle and build job platform, job platform adopts fastener type steel pipe frame to set up, pipe support be connected to steel fastener, support, in length and breadth apart from being 400/800mm, is equipped with successively horizontal 20# channel-section steel and longitudinal two-layer channel-section steel of 20# below job platform.When the rigidity of platform and stability must guarantee to carry out lifting operation on job platform, bearing load is uniformly distributed and going down.
Referring to Fig. 3, concrete frame trestle job platform steel pipe frame of the present invention is arranged schematic diagram, the intensive stabilization zone in Fig. 3 a figure wherein, and steel frame pipe vertical rod in length and breadth spacing is 400mm, non-dense set stabilization zone, steelframe steel frame pipe vertical rod in length and breadth spacing is 800mm.Shearing supports and arranges by facade form, and meeting cat ladder place bridging can arrange in inner side.
Upper and lower for convenience of constructor, in non-dense set stabilization zone, establish one of upper and lower cat ladder, referring to Fig. 3 b cat ladder width, be 600mm, meanwhile in order to ensure constructor's personal safety, in job platform surrounding, be provided with the guard rail that 1.2m is high.The screw-down torque that is connected to steel fastener of steel pipe frame should not be less than 40N.M, should not be greater than 65N.M yet.
Step 2: beam-ends supporting: four beam-ends that utilize the crossbeam of square crossing above lifting-up support supporting concrete frame trestle on job platform along concrete frame trestle surrounding.
Step 3: unloading: the load that removal concrete frame beam, post support.
Step 4: at the bottom of Vierendeel girder, jacking resets: both sides arrange two and underpin jack below each beam-ends lifting-up support, utilize at the uniform velocity four beam-ends of the crossbeam of jacking concrete frame trestle top square crossing of jack, when the crossbeam bottom hoisting depth of concrete frame trestle top square crossing reaches requirement height+3mm, stop four beam-ends of jack jacking, then adopt steel cushion block that jack is replaced.
Referring to Fig. 1, Vierendeel girder fulcrum of the present invention place adopts 4 32t hydraulic jack support tops, and No. 14 i iron are also installed at jack top, and i iron and lifting-up support bottom are close to, and at the bottom of lifting-up support and Vierendeel girder, the strong point is fastening.
Step 5, concrete frame trestle distortion resets: at concrete frame trestle capital, utilize 3 tons guide chain along the deformation of concrete frame trestle capital in the other direction westwards direction stretch and draw, until concrete frame trestle capital is eliminated lateral deformation deformation.
Step 6: cleaning doghole: remove the disqualified concrete at concrete beam and column node place, until expose the new face of concrete structure, and cleaning concrete frame column surface.
Step 7: concrete frame trestle node is repaired: adopt GM2102 type high-strength composite grout successively the doghole of concrete frame column top successively to be built, while repairing doghole closing in, adopt the real doghole mouth of GRCM quick setting and rapid hardening type strength cement-based grouting material plug, keep grouting material in moisture state, water seasoning concrete frame trestle 2-3d.
The water/binder ratio of above-mentioned high-strength composite grout and quick setting and rapid hardening type strength cement-based grouting material is no more than 0.4, and intensity reaches C45.
Step 8: affixing carbon fabric reinforcement: at concrete frame beam, place, post crack affixing carbon fabric.Wherein the specification of carbon cloth is 300g/m
2adopt epoxide-resin glue to paste, at concrete frame beam, post joints, concentrate place, adopt the wide carbon fiber hoop of 500mm to reinforce, for the horizontal fracture at concrete frame trestle middle part, adopting diameter is that 100mm spacing is that the carbon fiber hoop of 200mm seals processing.
Step 9: remove job platform and lifting-up support: by after the concrete frame trestle maintenance 7d after carbon fiber reinforcement, by job platform and lifting-up support complete removal.
Follow the above-mentioned technical step of the present invention, the concrete strength of former concrete beam and column node reaches C45, exceed former beam, the concrete intensity one-level of post, the center line of concrete column departs from former design axis 1.5mm, meet the requirement of design and construction inspection rules, the position of beam is consistent with former design attitude, and secondary damage does not appear in beam, post node.
Claims (2)
1. the reparation of existing reinforced concrete bean column node and a reinforcement means, is characterized in that: the method comprises the following steps:
(1) build job platform: in existing building concrete frame trestle surrounding, and be positioned at high 2/3 place of this concrete frame trestle and build job platform, job platform adopts fastener type steel pipe frame to set up, steel pipe frame be connected to fastener, below job platform, lay two-layer channel-section steel, around job platform central part, be arranged to the intensive stabilization zone of cross, the steel pipe frame vertical rod of this intensive stabilization zone in length and breadth spacing is 400mm, in intensive stabilization zone, surrounding is arranged to respectively common stabilization zone, and common stabilization zone steel pipe frame vertical rod in length and breadth spacing is 800mm;
(2) beam-ends supporting: four beam-ends that utilize the crossbeam of square crossing above lifting-up support supporting and concrete frame trestle on job platform along concrete frame trestle surrounding;
(3) unloading: the load that removal concrete column supports;
(4) at the bottom of concrete frame beam, jacking resets: below each concrete frame beam-ends lifting-up support, both sides arrange two and underpin jack, utilize at the uniform velocity four beam-ends of the crossbeam of jacking concrete frame trestle top square crossing of jack, when the crossbeam bottom hoisting depth of concrete frame trestle top square crossing reaches former designing requirement height+3mm, stop four beam-ends of jack jacking, then adopt steel cushion block that jack is replaced;
(5) distortion of concrete frame trestle resets: at concrete frame trestle capital, utilize guide chain to stretch and draw along the distortion of concrete frame trestle capital in the other direction, until concrete frame trestle capital is eliminated lateral deformation;
(6) cleaning doghole: the crisp broken concrete of concrete frame trestle capital and concrete frame beam junction is removed, until expose the new face of hard structure;
(7) concrete frame trestle is repaired: adopt high-strength composite grout successively the doghole of concrete frame column top to be repaired, while repairing doghole closing in, adopt the real doghole mouth of quick setting and rapid hardening type strength cement-based grouting material plug, keep grouting material in moisture state, curing concrete frame column 2-3d;
(8) affixing carbon fabric reinforcement: to concrete frame beam, place, concrete frame trestle crack affixing carbon fabric, the mass area ratio of carbon cloth is 300g/m
2adopt epoxide-resin glue to paste, at concrete frame beam, concrete frame trestle joints, concentrate place, adopt the wide carbon fiber hoop of 500mm to reinforce, for the horizontal fracture at concrete frame trestle middle part, adopting diameter is that 100mm spacing is that the carbon fiber hoop of 200mm is reinforced;
(9) remove job platform and lifting-up support: by after the concrete frame beam after carbon fiber reinforcement, concrete frame trestle maintenance 7d, job platform and lifting-up support are removed.
2. the reparation of existing reinforced concrete bean column node as claimed in claim 1 and reinforcement means, it is characterized in that: the high-strength composite grout adopting in step (7) concrete frame trestle repair process and the water/binder ratio of quick setting and rapid hardening type strength cement-based grouting material are no more than 0.4, and intensity reaches C45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210092635.XA CN102587689B (en) | 2012-03-31 | 2012-03-31 | Repairing and strengthening method for existing reinforced concrete beam-column joints |
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| CN201210092635.XA CN102587689B (en) | 2012-03-31 | 2012-03-31 | Repairing and strengthening method for existing reinforced concrete beam-column joints |
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| CN102587689A CN102587689A (en) | 2012-07-18 |
| CN102587689B true CN102587689B (en) | 2014-10-29 |
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| CN103132513A (en) * | 2013-02-25 | 2013-06-05 | 中交武汉港湾工程设计研究院有限公司 | Repairing method of damaged foundation pile of high-pile wharf |
| CN103306217A (en) * | 2013-06-14 | 2013-09-18 | 杭州岩土工程有限公司 | Method for sticking carbon fiber plates through prestress |
| CN103397787B (en) * | 2013-07-26 | 2016-05-04 | 河海大学 | The two-way X intersection of a kind of reinforced column underpinning technique |
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| CN112681512B (en) * | 2020-12-21 | 2022-09-13 | 中交第四公路工程局有限公司 | Hollow support structure and method for construction of high and large space combination beam |
| CN113622703B (en) * | 2021-08-18 | 2022-05-27 | 中国矿业大学 | Method for reforming and reinforcing prestressed reinforced concrete beam |
| CN113774972B (en) * | 2021-09-28 | 2022-06-07 | 中国矿业大学 | Reinforcing method for overload punching damage of independent foundation under column |
| CN114717958A (en) * | 2022-04-09 | 2022-07-08 | 中铁上海工程局集团第五工程有限公司 | Method for installing large specially-made Bailey beam |
| CN114893012B (en) * | 2022-05-07 | 2023-07-18 | 浙江翰达工程检测有限公司 | Reset method for reinforced concrete column |
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