CN104032712A - Hydraulic concrete crack patching construction method - Google Patents
Hydraulic concrete crack patching construction method Download PDFInfo
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- CN104032712A CN104032712A CN201310068964.5A CN201310068964A CN104032712A CN 104032712 A CN104032712 A CN 104032712A CN 201310068964 A CN201310068964 A CN 201310068964A CN 104032712 A CN104032712 A CN 104032712A
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Abstract
Disclosed is a hydraulic concrete crack patching construction method. A filling method, an injection method and a surface covering method are utilized for patching cracks to recover water resistance and durability, and patching is also performed in terms of structure safety and attractive appearance. The filling method is suitable for patching wide cracks (the width of the cracks is larger than 0.5mm). The injection method includes a pressure injection method and a vacuum inhalation method. A pressure grouting method is suitable for deep and narrow cracks, that is, the depth of the cracks is larger than 150mm and the width of the cracks is not in excess of 2mm. The surface covering method refers to filming surfaces of fine cracks so as to improve the water resistance and the durability, that is, the width of the cracks is smaller than 0.2mm, and the surface covering method includes a crack coating method and a total coating method. The hydraulic concrete crack patching construction method is simple and practical, and convenient to perform construction.
Description
Technical field
The present invention relates to WR and hydropower construction technical field, be specially a kind of the concrete crack of water conservancy project reparation construction method.
Background technology
In hydraulic structure, concrete is to mix and stir according to a certain percentage by cement, fines, coarse aggregate, water and Admixture the nonuniformity fragile material forming, and is requisite constructional materials in engineering.The crack producing in course of hardening has not only affected attractive in appearance, returns workmanship and leaves hidden danger, must take rational engineering measure in construction, controls and reduce quantity and the width in crack in concrete.Distress in concrete is divided into crack, top layer, deep layer crack and through crack by degree of depth difference; By fracture aperture, change and can be divided into dead seam, seam alive and increase seam; By producing reason, be divided into thermal cracking, shrinkage crack, corrosion of steel bar crack, overload crack, alkali-aggregate reaction crack, inhomogeneous settlement of ground crack etc.The reason that distress in concrete forms is very complicated, often the result of multiple unfavorable factor comprehensive function.According to the relevent statistics, the distress in concrete causing lack of standardization of constructing accounts for 80% left and right, and quality of materials crack poor or the unreasonable generation of match ratio accounts for 15% left and right, designs the improper crack causing and may account for 5%.Due to many-sided reason, prospective design unit cannot in depth carry out geological prospecting work, and tunnel surrounding classification is evaluated and support structure design lacks scientific basis, with certain blindness.Indivedual Construction units are limited to the shortcoming of self-management and level professional technology, change arbitrarily former design.During concrete production, measuring raw materials error is large, and especially the admixture of Admixture is random large, according to the actual moisture content of sand, building stones, does not adjust in time construction water amount, causes concrete water-cement ratio to increase.In addition, in concrete transportation and pumping procedure, add the phenomenon of water also commonplace.Blindly pursue construction speed, arbitrarily shift to an earlier date demould time, make the excessive bearing load of low strength concrete, destroyed concrete structure.After the demoulding, do not carry out concrete moist maintenance.Sand, building stones air storage during hot weather construction, without effective cooling measure, concrete molding temperature is high.The cold-proof heat insulation of taking during winter construction is taken effective measures.Also have cement type to select improper, soundness is bad, and the cement of different batches is mixed.Rubble, sand grating are poor, and mud content exceeds standard, and in rubble, content of stone powder is large, and pin, tablet are too much, have affected the cementing of cement and aggregate.While carrying out mix-design, ignore cement consumption and increase the impact on concrete quality, mistake thinks that cement consumption is more, and concrete strength is higher.The guidance that lacks professional and technical personnel of selecting to admixture and Admixture, often falls flat.
Summary of the invention
The object of the invention is to adopt filling method, injection method, surface coverage method, mend a split to recover water proofing property and durability, also from structural safety and angle attractive in appearance and repair.
To achieve these goals, the present invention realizes by the following technical solutions:
1, select placement method
This method is suitable for repairing wider crack (crack width is greater than 0.5 mm).Specific practice is along place, crack cutter U-shaped or V-shaped groove, groove top width approximately 10 cm, underfill sealants in groove.Filler available water cement mortar, epoxy mortar, elastic epoxy mortar, polymer cement mortar.If Reinforcing Steel Bar In Reinforced Concrete Structure is corrosion, by concrete chisel removal to can fully processing the reinforcing bar part of having got rusty, reinforcing bar is eliminated rust.Then carry out antirust processing, then in groove the material such as polymer-filled cement mortar or epoxy resin mortar.For the seam of living, along fracture strike, open a U-lag, the material that bottom land pad one deck and concrete are not sticky, recharges elasticity caulking material, makes itself and groove two-side adhesive.Caulking material can Free Transform along the whole width of groove like this, when tension deformation occurs in crack, caulking material can not pulled open.
2, select method for implanting
Injection method is divided into 2 kinds of pressure-injected and vacuum inhalations.Pressure grouting is applicable to dark thinner crack, and the penetration of fracture surpasses 150mm, stitches wide over 2mm's; Adopting vacuum impregnation is to utilize vacuum pump to make to stitch interior formation vacuum, will starch material and suck in seam, and this method is applicable to the repairing of various external cracks.Grouting agent has cement grouting material, common epoxy grouting material, elastic epoxy grouting material.
3, select surface covering method
This is a kind ofly on the surface of microscopic checks, to film, and take and improves the method for repairing and mending that its water proofing property and durability are object, and crack width is less than 0.2 mm, is divided into and applies crack part and all apply 2 kinds of methods.The shortcoming of this method is that patch work cannot be deep into inside, crack, to extending crack, is difficult to control its variation.Surface coverage method material therefor looks repairing object and building environment of living in is different and different, conventionally adopts elasticity coating film waterproof material, polymer cement cream, thin polymer film.During construction, first use steel wire brush by concrete surface hacking, removing surface attachments, water is rinsed well rear fully dry, then uses the pore of resin fill concrete surface, then uses patching material coating surface.
Beneficial effect of the present invention is to adopt filling method, injection method, surface coverage method, mends a split to recover water proofing property and durability, also from structural safety and angle attractive in appearance and repair.
The specific embodiment
Example 1, a kind of the concrete crack of water conservancy project reparation construction method
(1) engineering overview
Somewhere, Gansu river training works starts a newly-built rubber dam project in June, 2011, in base plate (designing base plate thick is 1 m) concrete form removal, find that facade has produced and has been about 0.5 m along reinforcing bar direction, width is about the crack of 0.3 mm, and backplate surface has produced many places map cracking after just having built 4～5 h, width is about 0.1 mm, and surperficial adularescent object leaches.
Through relevant technologies, personnel understand in depth field condition, and coherent detection personnel to raw-material sample analysis such as the same day on-the-spot cement, aggregate, mixing water etc. after, find SiO2 in aggregate exceed standard (reaching 1.5%), and after having built concrete, do not take in time cooling measure, cause the generation in crack.
(2) processing method
According to actual conditions research, determine to adopt the third newborn mortar to repair as filler.This material has good adhesive property, cracking resistance, waterproof, anti-chloride permeability, anticorrosion, freeze proof, wear-resisting.
A, cast concrete base are processed.For the third newborn mortar and base concrete can be bondd well, concrete surfacing is most important.This project adopts wire brush to brush a surperficial floating layer dirt, and privileged sites adopt drill rod hacking, then with clear water, rinse, soak, and make cast concrete base in surfacedry saturated condition.
B, the third newborn mortar preparation.According to match ratio weighing, stack respectively.First the third breast is mixed, after cement and sand mix, pour into and mix and stir in dish, then mixed liquor is slowly poured into artificial uniform mixing in cement mortar mixture.Once the amount of mixing and stirring is controlled at 10 kg and is advisable.Water/binder ratio is selected little water/binder ratio under the prerequisite that meets workability requirement as far as possible.
C, manually smear pressure.For guaranteeing that construction quality is first with the bottoming of the clean slurry of the third breast, then smear pressure mortar.THICKNESS CONTROL, in 5 mm left and right, requires screed closely knit, and surfacing is smooth.
D, maintenance.The third newborn mortar is smeared and is pressed rear approximately 4 h just to produce final set, now with agricultural atomizer, carries out fog curing.After maintenance 1 d, with hairbrush, on the third newborn mortar surface layer, brush the clean slurry of the third breast together again.Requirement smoothens, seals, and until clean slurry, produces after final set is tied firmly and continues fog curing again.Maintenance criteria: mortar surface layer remains dampness, curing time is 7 d.
Through the above processing to underplate concrete crack, rubber dam project is in formal startup operation of in August, 2012, and operational effect is good.
Claims (4)
1. the placement method described in a concrete crack of water conservancy project reparation construction method is to repair wider crack (crack width is greater than 0.5 mm); Specific practice is along place, crack cutter U-shaped or V-shaped groove, groove top width approximately 10 cm, underfill sealants in groove; Filler available water cement mortar, epoxy mortar, elastic epoxy mortar, polymer cement mortar; For the seam of living, along fracture strike, open a U-lag, the material that bottom land pad one deck and concrete are not sticky, recharges elasticity caulking material, makes itself and groove two-side adhesive; Caulking material can Free Transform along the whole width of groove like this, when tension deformation occurs in crack, caulking material can not pulled open.
2. the method for implanting described in a concrete crack of water conservancy project reparation construction method is divided into 2 kinds of pressure-injected and vacuum inhalations; Pressure grouting is applicable to dark thinner crack, and the penetration of fracture surpasses 150mm, stitches wide over 2mm's; Adopting vacuum impregnation is to utilize vacuum pump to make to stitch interior formation vacuum, will starch material and suck in seam, and this method is applicable to the repairing of various external cracks; Grouting agent has cement grouting material, common epoxy grouting material, elastic epoxy grouting material.
3. the surface covering method described in a concrete crack of water conservancy project reparation construction method is to film on the surface of microscopic checks, take and improve the method for repairing and mending that its water proofing property and durability are object, be that crack width is less than 0.2 mm, be divided into and apply crack part and all apply 2 kinds of methods; Material therefor adopts elasticity coating film waterproof material, polymer cement cream, thin polymer film.
4. a kind of the concrete crack of water conservancy project reparation construction method as claimed in claim 3, when construction, first use steel wire brush by concrete surface hacking, removing surface attachments, water is rinsed well rear fully dry, then use the pore of resin fill concrete surface, then use patching material coating surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310068964.5A CN104032712A (en) | 2013-03-05 | 2013-03-05 | Hydraulic concrete crack patching construction method |
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| CN201310068964.5A CN104032712A (en) | 2013-03-05 | 2013-03-05 | Hydraulic concrete crack patching construction method |
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| CN104032712A true CN104032712A (en) | 2014-09-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746479A (en) * | 2015-02-03 | 2015-07-01 | 中国水利水电第十四工程局有限公司 | Diversion tunnel concrete water seepage leaking stoppage construction method |
| CN111042568A (en) * | 2019-12-30 | 2020-04-21 | 中建港航局集团有限公司 | Precast beam crack repairing construction process |
-
2013
- 2013-03-05 CN CN201310068964.5A patent/CN104032712A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104746479A (en) * | 2015-02-03 | 2015-07-01 | 中国水利水电第十四工程局有限公司 | Diversion tunnel concrete water seepage leaking stoppage construction method |
| CN111042568A (en) * | 2019-12-30 | 2020-04-21 | 中建港航局集团有限公司 | Precast beam crack repairing construction process |
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Application publication date: 20140910 |