CN102691422A - New-old concrete combining construction method at local repair section - Google Patents
New-old concrete combining construction method at local repair section Download PDFInfo
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- CN102691422A CN102691422A CN2012101984329A CN201210198432A CN102691422A CN 102691422 A CN102691422 A CN 102691422A CN 2012101984329 A CN2012101984329 A CN 2012101984329A CN 201210198432 A CN201210198432 A CN 201210198432A CN 102691422 A CN102691422 A CN 102691422A
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Abstract
The invention relates to a new-old concrete combining construction method at a local repair section. The construction method comprises the following steps of: (1) old concrete grooving: sawing joints on the old concrete on one side of a combination surface by a joint saw and uniformly arranging grooves at equal intervals; (2) groove cleaning: cleaning away the concrete within a grooving range in the step (1) by using impacting equipment and manually chiseling away edge-corner areas to form flat groove bottoms; (3) combination surface scabbling: scabbling the cutting surface of the middle and old concrete in the step (1); (4) interfacial agent spraying: spraying an interfacial binding agent on the combination surface of the new-old concrete; (5) steel bar laying: laying steel bars or steel bar supports in the grooves arranged in the step (1); and (6) new concrete pouring: pouring the new concrete inside the erected steel bar supports and the grooves. The new-old concrete combining construction method provided by the invention is simple in construction method and flexible in technological operation, can enable the new and old concrete at the local repair section to be closely combined, is durable and stable, and is widely applicable to new-old concrete engineering practice at the local repair section.
Description
Technical field
The invention belongs to concrete construction field, be specifically related to the job practices of a kind of sectional repair section bond between fresh and hardened concretes.
Background technology
Bond between fresh and hardened concretes problem construction is a FAQs in the concrete construction, concrete sectional repair section especially, and the combination construction of New-old concrete is more common.The intensity of bond between fresh and hardened concretes layer not only relates to big structure design of stopping layering on the long-pending coagulation, block placement, superposed beam, plate, and to the current maintenance that has suffered the concrete structure of disease in a large number, reinforce its important and practical meanings all arranged.If handle badly, following problem often appears in binding site: New-old concrete can not be united stressed; The as placed concrete temperature is shunk with old concrete and is produced the crack, infiltrates with moisture follow-up disease takes place.
Common processing method mainly contains two kinds at present, and the one, remove old concrete, build again; The 2nd, be provided with excessive section, adopt the high performance concrete compensation.First method has effectively been removed the possibility that above-mentioned harm produces, but has caused waste undoubtedly, has increased construction cost, and the back is a kind of then to lose the ample scope for abilities in the sectional repair section because limit in the place.
Summary of the invention
Technical problem to be solved by this invention provides the job practices of a kind of sectional repair section bond between fresh and hardened concretes, can guarantee that the combination of New-old concrete is close, and durable stable, effectively bonding surface solves cracking, and moisture infiltrates problem.
Technical scheme of the present invention: the job practices of a kind of sectional repair section bond between fresh and hardened concretes, it may further comprise the steps:
(1) old concrete fluting: will combine the old concrete of one side side, and use the joint saw saw kerf, and evenly offer equally spaced groove;
(2) clear groove: use impact device that the concrete in the fluting scope in the step (1) is removed, the corner areas manual work cuts, and forms smooth bottom land.
(3) bonding surface cutter hair: with the cut surface cutter hair of old concrete in the step (1);
(4) spraying interfacial agents: on New-old concrete joint surface, spray interface adhesive;
(5) lay reinforcing bar: lay reinforcing bar or Steel bar rack in the groove that step (1) is offered;
(6) build as placed concrete: build as placed concrete in a good Steel bar rack and fluting inside.
The job practices of described sectional repair section bond between fresh and hardened concretes comprises old concrete fluting, clear groove, bonding surface cutter hair, spray interfacial agents, lay reinforcing bar and build six road master operations such as as placed concrete.At first be the old concrete fluting,, use large-scale many saw blades joint saw or two saw blade joint saw saw kerf for the old concrete of bonding surface one side.Adjacent two blades are one group, open a groove, and blade space is groove width.About 5～the 8cm of general groove width, the about 20～70cm of flute length, groove depth is provided with on demand, is generally 1/2～2/3 of old concrete thickness, and the spacing of adjacent slot is regulated the position of two saw blades of adjacent set as required, is generally 30～50cm.The concrete that uses Churn drill or other impact devices will slot in the scope is then removed, and corner areas uses the chisel manual work to cut, thereby forms comparatively smooth bottom land.Then, use the artificial cutter hair of Churn drill or chisel for the cut surface of the old concrete of saw blade cutting.General, require that the convex-concave discrepancy in elevation is not less than 1cm on the cut surface, the area of outstanding and depression is about equally.Before as placed concrete is built, on New-old concrete joint surface, spray interface adhesive then, to increase the binding ability of New-old concrete.Then laying reinforcing bar in institute slots can be provided with multistory reinforced according to the combination thickness of New-old concrete.General, reinforcing bar adopts the indented bars of diameter 16mm, and the vertical reinforcing bar of weak point that also can on longitudinal reinforcement, weld many diameter 14mm constitutes reinforcing bar.Special, can in groove, lay Steel bar rack, again reinforcing bar is placed on the Steel bar rack.Build as placed concrete in a good template and fluting inside at last.When building, note the closely knit of groove inner concrete and avoid the unusual fluctuation of reinforcement location.After building completion, health gets final product.
The present invention compared with prior art has following beneficial effect: job practices of the present invention is simple, technological operation is flexible; The bond between fresh and hardened concretes that can guarantee the sectional repair section is close; Durable stable, effectively bonding surface solves cracking, problems such as moisture infiltration; And simple, quick, cost is low, can be widely used in the engineering practice of sectional repair section bond between fresh and hardened concretes construction.
The specific embodiment
The job practices of a kind of sectional repair section bond between fresh and hardened concretes on certain freeway tunnel road surface, it may further comprise the steps:
(1) old concrete fluting: will combine the old concrete of one side side, and use the joint saw saw kerf, and evenly offer equally spaced groove;
(2) clear groove: use impact device that the concrete in the fluting scope in the step (1) is removed, the corner areas manual work cuts, and forms smooth bottom land.
(3) bonding surface cutter hair: with the cut surface cutter hair of old concrete in the step (1);
(4) spraying interfacial agents: on New-old concrete joint surface, spray interface adhesive;
(5) lay reinforcing bar: lay reinforcing bar or Steel bar rack in the groove that step (1) is offered;
(6) build as placed concrete: build as placed concrete in a good Steel bar rack and fluting inside.
Concrete embodiment is: certain freeway tunnel road surface, the pavement concrete at maintenance well well lid edge is making, need change the well lid of reduced size because of the well lid problem at present, by the original diameter 1.2m present diameter 0.8m that replaces.Need build as placed concrete between therefore new well lid periphery and the first pavement concrete.But area is less owing to newly building, and diseases such as New-old concrete joint surface cracking, as placed concrete fragmentation probably occur in the future, therefore adopts the present invention to carry out the bond between fresh and hardened concretes construction.
At first use the double blade concrete cutting machine along the well lid diametric(al) in the old concrete cutting, the about 45cm of separation, groove width 5cm, flute length 17cm, groove depth are the half the of pavement concrete thickness, about 15cm.The concrete that uses Churn drill will slot in the scope is then removed, and corner areas uses the chisel manual work to cut.Then, use the artificial cutter hair of Churn drill for the cut surface of the old concrete of saw blade cutting.On New-old concrete joint surface, spray interface adhesive then, to increase the binding ability of New-old concrete.Then laying Steel bar rack, mounting reinforcing steel bars in institute slots.Reinforcing bar adopts the indented bars of diameter 16mm, length 30cm.Build as placed concrete in a good template and fluting inside at last.When building, make the abundant closely knit of groove inner concrete and avoid the unusual fluctuation of reinforcement location.After building completion, health.
After being open to traffic, facts have proved that this method of disposal is simply effective, the well lid periphery is repaired the section thing and disease occurred.
Claims (1)
1. the job practices of sectional repair section bond between fresh and hardened concretes is characterized in that it may further comprise the steps:
(1) old concrete fluting: will combine the old concrete of one side side, and use the joint saw saw kerf, and evenly offer equally spaced groove;
(2) clear groove: use impact device that the concrete in the fluting scope in the step (1) is removed, the corner areas manual work cuts, and forms smooth bottom land.
(3) bonding surface cutter hair: with the cut surface cutter hair of old concrete in the step (1);
(4) spraying interfacial agents: on New-old concrete joint surface, spray interface adhesive;
(5) lay reinforcing bar: lay reinforcing bar or Steel bar rack in the groove that step (1) is offered;
(6) build as placed concrete: build as placed concrete in a good Steel bar rack and fluting inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101984329A CN102691422A (en) | 2012-06-16 | 2012-06-16 | New-old concrete combining construction method at local repair section |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101984329A CN102691422A (en) | 2012-06-16 | 2012-06-16 | New-old concrete combining construction method at local repair section |
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| CN102691422A true CN102691422A (en) | 2012-09-26 |
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| CN2012101984329A Pending CN102691422A (en) | 2012-06-16 | 2012-06-16 | New-old concrete combining construction method at local repair section |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179120A (en) * | 2014-07-10 | 2014-12-03 | 燕山大学 | Treatment method for bonding surface of fresh and old concrete |
| CN104193406A (en) * | 2014-08-27 | 2014-12-10 | 天津大学 | Repair method of construction engineering reinforced concrete structure |
| CN105714693A (en) * | 2016-02-03 | 2016-06-29 | 蓝海建设集团有限公司 | Plate girder bridge strengthening method |
| CN106677803A (en) * | 2017-02-03 | 2017-05-17 | 长安大学 | Structure and method for treating severe disengagement, cracking and other defects of tunnel lining |
| CN106906794A (en) * | 2017-03-20 | 2017-06-30 | 中国华电科工集团有限公司 | A kind of dam armored concrete panel construction crack treatment construction technology |
| CN109518985A (en) * | 2018-10-10 | 2019-03-26 | 广东省建筑设计研究院 | A kind of design and construction method improving the power transmission of new-old concrete interface |
| CN110565457A (en) * | 2019-08-21 | 2019-12-13 | 中铁四院集团岩土工程有限责任公司 | Method for renovating exposed reinforcing steel bars of ballastless track base and repairing structure |
| CN113073868A (en) * | 2021-04-13 | 2021-07-06 | 黄滢 | Mortar type epoxy terrace bottom scraping device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179120A (en) * | 2014-07-10 | 2014-12-03 | 燕山大学 | Treatment method for bonding surface of fresh and old concrete |
| CN104179120B (en) * | 2014-07-10 | 2016-01-06 | 燕山大学 | A kind of new-old concrete bonding processing method |
| CN104193406A (en) * | 2014-08-27 | 2014-12-10 | 天津大学 | Repair method of construction engineering reinforced concrete structure |
| CN104193406B (en) * | 2014-08-27 | 2016-05-18 | 天津大学 | A kind of method for repairing and mending of architectural engineering reinforced concrete structure |
| CN105714693A (en) * | 2016-02-03 | 2016-06-29 | 蓝海建设集团有限公司 | Plate girder bridge strengthening method |
| CN106677803A (en) * | 2017-02-03 | 2017-05-17 | 长安大学 | Structure and method for treating severe disengagement, cracking and other defects of tunnel lining |
| CN106906794A (en) * | 2017-03-20 | 2017-06-30 | 中国华电科工集团有限公司 | A kind of dam armored concrete panel construction crack treatment construction technology |
| CN109518985A (en) * | 2018-10-10 | 2019-03-26 | 广东省建筑设计研究院 | A kind of design and construction method improving the power transmission of new-old concrete interface |
| CN110565457A (en) * | 2019-08-21 | 2019-12-13 | 中铁四院集团岩土工程有限责任公司 | Method for renovating exposed reinforcing steel bars of ballastless track base and repairing structure |
| CN113073868A (en) * | 2021-04-13 | 2021-07-06 | 黄滢 | Mortar type epoxy terrace bottom scraping device |
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Application publication date: 20120926 |