CN103266772A - Curing method used for highway engineering construction concrete in winter - Google Patents
Curing method used for highway engineering construction concrete in winter Download PDFInfo
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- CN103266772A CN103266772A CN2013101854048A CN201310185404A CN103266772A CN 103266772 A CN103266772 A CN 103266772A CN 2013101854048 A CN2013101854048 A CN 2013101854048A CN 201310185404 A CN201310185404 A CN 201310185404A CN 103266772 A CN103266772 A CN 103266772A
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Abstract
The invention discloses a curing method used for highway engineering construction concrete in winter. The curing method comprises arranging a pressure boiler and a box girder precast pedestal; arranging a main pipe line which is communicated with the pressure boiler on the bilateral sides of the box girder precast pedestal; binding box girder rebar and installing a box girder formwork; pre-embedding thermometer holes and pouring concrete; arranging a curing shed moving support; installing a branch pipe line and a fog steam nozzle; covering a canvas insulation layer on the curing shed moving support; and performing still-stand period, temperature-rise period, constant temperature period and temperature-fall period curing. According to the curing method used for the highway engineering construction concrete in winter, water vapor is formed into fog to cure the concrete under no pressure or small pressure and the fog steam temperature is controlled at about 30 DEG C to enable the strength of cement concrete to be improved under the condition of constant temperature and humidity to be beneficial to the formation of hydration products that crystallization is complete and crystal materials are uniform, so that the temperature difference of the concrete surface and the environment caused by the removal of the insulation layer is redued, concrete cracks can be prevented, and the later strength and durability of components are guaranteed.
Description
Technical field
The present invention relates to a kind of concrete maintenance process, specifically, relate to a kind ofly for the concrete maintenance process of highway engineering construction in winter, belong to the engineering construction technical field.
Background technology
Current highway engineering concrete teletostage maintenance mainly contains regenerative process, steam heating and brooder heating.Regenerative process wherein: be applicable to that below ground engineering or structure are not suitable for concrete maintenance more than the ground.Steam heating: when adopting Portland cement, curing temperature should not be above 80 ℃; When adopting portland slag cement, curing temperature can reach 85 ℃.Brooder heating: require temperature of shed to be not less than 5 ℃, and should keep certain humidity, the safety prevention measure of the anti-gas poisoning of fire prevention should be arranged.
Require the curing temperature scope of steam heating for should not surpass 80 ℃ (85 ℃) in existing " highway bridge and culvert construction technique normalizing " (JTG/T F50-2011), do not provide optimum temperature-controlled area territory, in practice of construction, usually temperature is controlled at 70-80 ℃, hydrated cementitious is very fast, the early age strength of concrete height, but because the brilliant material growth of hydrated product is fast, crystallization is thick, often cause later strength to rise slowly, also have influence on the durability of works, surface temperature of concrete and environment temperature differ bigger after maintenance insulation layer and template are removed in succession like this, to removing having relatively high expectations of back concrete surface covering and heat insulating, concrete surface is prone to the crack, still need concrete surface is carried out covering and heat insulating, need continue normal use coal stove heating in the construction of employing brooder heating, will cause the interior carbon dioxide content of brooder to raise, cause the early stage carbonization of concrete, concrete structure durability is had a negative impact.
Summary of the invention
Technical problem to be solved by this invention is the problem at above-mentioned existence, provide a kind of for the concrete maintenance process of highway engineering construction in winter, very little to the late strength of concrete influence, avoided the high temperature health to finish thermal cracking and shrinkage crack that back concrete component internal-external temperature difference causes.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of for the concrete maintenance process of highway engineering construction in winter, it is characterized in that: described maintenance process may further comprise the steps:
At precasting yard pressure boiler and the beam prefabricated pedestal of case are set, lay trunk line in the both sides of the beam prefabricated pedestal of case, trunk line is communicated with pressure boiler;
Colligation case beam steel, the install bin beam forms;
Pre-buried thermometer hole, concreting: the metal sleeve of pre-buried length 10～15cm on reinforcing bar, colligation is put in 0L, 1/4L, 1/2L, 3/4L, each 1 place, L place of beam body web, base plate, top board when pre-buried on the reinforcing bar of beam slab, and be numbered concreting in order;
Arrange health canopy traversing carriage: after the concreting, around the beam body health canopy support is set, highly exceeds the end face 10 ± 2cm of beam body, length is than the big 20 ± 2cm of length of beam body, and width is than the big 10 ± 2cm of the widest part of beam body;
Branch pipe(tube) and mist vapour nozzle are installed: at trunk line setting several branch pipe(tube)s straight up, the spacing of adjacent branch pipe(tube)≤4 meter, the end of branch pipe(tube) is provided with mist vapour nozzle, the Way out of mist vapour nozzle becomes miter angle obliquely, distance between the outer wall of mist vapour nozzle and beam body is 1 ± 0.1 meter, and trunk line wraps up with thermal insulation material;
Cover the canvas insulation layer at health canopy support, the canvas lower edge compresses;
Pressure boiler carries mist vapour to carry out the health step, and the health step comprises quiet stage, temperature rise period, constant temperature stage and the temperature-fall period put:
Described quiet putting the stage: the quiet time of putting of wet concrete is 2～4 hours; The quiet time of putting of harsh concrete is 1 hour; The concrete in static time of putting that is mixed with retarding additive is 4～6 hours;
The described temperature rise period: carry mist vapour to heat up, beam surface programming rate is controlled in 10 ℃/h, and the heating up time is 2～3 hours;
The described constant temperature stage: the prestressed concrete health temperature remains on 30 ℃, treats that concrete crushing strength reaches 100% of design strength, enters temperature-fall period;
Described temperature-fall period: cooling rate is not more than 5 ℃/h, controls health temperature by valve control water vapour spray volume;
Remove insulation layer, remove when 100% and the curing age that concrete strength reaches design strength reaches seven days, remove health canopy support.
The present invention adopts above technical scheme, compared with prior art, has following effect: change traditional steam curing the health of into mist vapour, by pipeline to concreting ground, under no pressure or very little pressure, make the steam health concrete that nebulizes, reduced the temperature of steam, the control of mist stripping temperature is about 30 ℃, test specimen entity temperature is suitable, reduced because of the too high crackle that occurs of concrete local temperature and liter, it is too fast to lower the temperature, and makes cement concrete at constant temperature, increase intensity under the humidity constant state, be conducive to form perfect crystalline, the uniform hydrated product of brilliant material, and reduced to remove concrete surface and the ambient temperature differences of bringing behind the insulation layer, can prevent that the crack from appearring in concrete, and be conducive to form perfect crystalline, crystalline substance is expected uniform hydrated product, has guaranteed later strength and the durability of member.
Simultaneously, whole health process is not introduced carbon dioxide, has reduced the carbonation of concrete degree, has reduced the discharging of pollutant.
Below in conjunction with drawings and Examples the present invention is described in further detail.
Description of drawings
Accompanying drawing 1 is the apparatus structure schematic diagram of maintenance process in the embodiment of the invention;
Accompanying drawing 2 be in the accompanying drawing 1 A-A to structural representation;
Among the figure,
The 1-pressure boiler, the beam prefabricated pedestal of 2-case, 3-trunk line, 4-mist vapour conveyance conduit, 5-health canopy support, 6-beam body, 7-branch pipe(tube), 8-mist vapour nozzle.
The specific embodiment
Embodiment, a kind of is example for the concrete maintenance process of highway engineering construction in winter with the prefabricated case beam health, may further comprise the steps:
The first step: set up pressure boiler 1 at precasting yard, namely steam heating boiler is laid trunk line 3 in the both sides of the beam prefabricated pedestal 2 of case, and trunk line 3 is communicated with pressure boiler 1 by mist vapour conveyance conduit 4, and trunk line 3 adopts the pvc pipe of 5cm;
Second step: colligation case beam steel, install bin beam forms;
Second step: pre-buried thermometer hole metal sleeve, concreting: the metal sleeve of pre-buried internal diameter 12mm, long 10～15cm on reinforcing bar, colligation is on the reinforcing bar of beam slab when pre-buried, be put in 0L, 1/4L, 1/2L, 3/4L, each 1 place, L place of beam body 6 webs, base plate, top board, and be numbered concreting in order;
The 3rd step: arrange health canopy traversing carriage: after the concreting, health canopy support 5 is set around beam body 6, health canopy support 5 adopts φ 20 reinforcing bars to be welded, highly exceed the end face 10 ± 2cm of beam body 6, length is than the big 20 ± 2cm of length of beam body 6, and width is than the big 10 ± 2cm of the widest part of beam body 6;
The 4th step: branch pipe(tube) and mist vapour nozzle are installed: trunk line 3 is provided with branch pipe(tube) 7 straight up, branch pipe(tube) 7 adopts the pvc pipe of 2cm, the spacing of adjacent branch pipe(tube) 7≤4 meter, the end of branch pipe(tube) 7 is provided with mist vapour nozzle 8, the Way out of mist vapour nozzle 8 becomes miter angle obliquely, distance between the outer wall of mist vapour nozzle 8 and beam body 6 is 1 ± 0.1 meter, directly blows on concrete to prevent mist vapour, and trunk line 3, mist vapour conveyance conduit 4 usefulness thermal insulation materials wrap up;
The 5th step: cover the canvas insulation layer at health canopy support 5, the canvas lower edge compresses with steel pipe, reinforcing bar, prevents from letting in air;
The 6th step: pressure boiler 1, namely steam heating boiler carries mist vapour to carry out the health step;
The health step is divided four-stage, quiet putting the stage: wet concrete is 2～4 hours; Harsh concrete is 1 hour, the concrete that is mixed with retarding additive is 4～6 hours, the quiet temperature of putting should not be lower than 10 ℃, this stage mainly is to make that cement has a more abundant hydration time in the concrete, concrete forms certain intensity, to strengthen concrete to the resistance of temperature rise period structural deterioration effect, in component surface crack and loose phenomenon appear when avoiding the maintenance of mist vapour.This is very important for eliminating the swelling of concrete in intensification;
Temperature rise period: carry mist vapour to heat up, beam surface programming rate is controlled in 10 ℃/h, and the heating up time is 2～3 hours, in this stage, hydrated reaction of cement is accelerated, and forms certain intensity gradually, and the distortion of concrete generation heat expansion, the about temperature difference can produce thermal stresses;
The constant temperature stage: the prestressed concrete health temperature remains on 30 ℃, treats that concrete strength reaches 100%, after can lower the temperature, the intensity of concrete test block is concrete strength under the identical curing condition;
Temperature-fall period: cooling rate is not more than 5 ℃/h, controls health temperature by valve control water vapour spray volume, preventing the excessive and generation crack of concrete surface and internal difference in temperature, and fills in mist vapour health record;
The concrete of control after building 10 ℃-30 ℃ of temperature in 7d, heating-cooling speed is per hour measured temperature one time, and thermometer stops in pipe and is not less than 3 minutes, and temperature is write down in taking-up then.To member, i.e. carried out a temperature survey and record in per 2 hours during case beam constant temperature health, set up health temperature and detect account.By test room the compressive strength check is carried out in test block, reached 100% design strength rear and allow to lower the temperature.
The 7th step: when 100% and the curing age that concrete strength reaches design strength reaches seven days, remove insulation layer, remove health canopy support 5.
The health effect:
Carry out the intensity rebound test by the concrete structure that the little carbon mist of low temperature vapour method is carried out the health in winter, the result is qualified and even, no any crack, surface all, the little carbon mist of low temperature vapour regimen is controlled the mist stripping temperature about 30 ℃, test specimen entity temperature is suitable, avoided the too fast phenomenon of the too high easy generation fine cracks of vapor (steam) temperature and heating-cooling to take place, make cement concrete under constant temperature, humidity constant state, increase intensity, be conducive to form perfect crystalline, the uniform hydrated product of brilliant material, guaranteed later strength and the durability of member.
Test:
In the speed construction of blue or green Lingao, for analyzing the health of the little carbon mist of low temperature vapour to the influence of concrete strength, verify the feasibility of the little carbon mist of low temperature vapour health, carried out following contrast test according to maintenance process of the present invention:
Getting C30 precast plate concrete mix, to carry out test block prefabricated, be positioned over respectively under 75 ℃ of steam curing conditions and the 30 ℃ of mist vapour health-preserving conditions, respectively 3d, 5d, 7d, 14d, 28d are carried out the concrete strength compression test length of time, (MPa) comparing result of concrete crushing strength under the different condition such as following table:
| Health-preserving condition/length of time | 3d | 5d | 7d | 14d | 28d |
| 75 ℃ of steam curings | 28.2 | 31.8 | 33.2 | 37.2 | 41.6 |
| The health of 30 ℃ of mist vapour | 21.5 | 26.2 | 28.4 | 35.2 | 41.2 |
The experimental data explanation, 75 ℃ of steam curings have improved the hydration rate of concrete cement owing to higher temperature, and concrete hydration reaction is corresponding very fast, and early age strength of concrete promotes very fast, but later strength increasess slowly; Under 30 ℃ of mist vapour health-preserving conditions, concrete test block intensity is early stage increase relatively slow, basic identical under later stage concrete strength and the 75 ℃ of steam curing conditions.
Low temperature (30 ℃) health is very little to the late strength of concrete influence, helps avoid the high temperature health simultaneously and finishes thermal cracking and the shrinkage crack that back concrete component internal-external temperature difference causes, and helps to alleviate the early stage carbonization of the concrete that is prone in the general health.
The little carbon health-preserving method of low temperature mist vapour that this health-preserving method is discussed is equally applicable to the health of position winter construction such as cast-in-situ box girder, precast hollow slab, bent cap and pier stud.
Those skilled in the art will recognize that; the above-mentioned specific embodiment is exemplary; be in order to make those skilled in the art can better understand content of the present invention; should not be understood as limiting the scope of the invention; so long as the improvement of doing according to technical solution of the present invention all falls into protection scope of the present invention.
Claims (1)
1. one kind is used for the concrete maintenance process of highway engineering construction in winter, and it is characterized in that: described maintenance process may further comprise the steps:
At precasting yard pressure boiler (1) and the beam prefabricated pedestal of case (2) are set, lay trunk line (3) in the both sides of the beam prefabricated pedestal of case (2), trunk line (3) is communicated with pressure boiler (1);
Colligation case beam steel, the install bin beam forms;
Pre-buried thermometer hole, concreting: the metal sleeve of pre-buried length 10～15cm on reinforcing bar, colligation is put in 0L, 1/4L, 1/2L, 3/4L, each 1 place, L place of beam body (6) web, base plate, top board when pre-buried on the reinforcing bar of beam slab, and be numbered concreting in order;
Arrange health canopy traversing carriage: after the concreting, health canopy support (5) is set around beam body (6), highly exceed the end face 10 ± 2cm of beam body (6), length is than the big 20 ± 2cm of length of beam body (6), and width is than the big 10 ± 2cm of the widest part of beam body (6);
Branch pipe(tube) and mist vapour nozzle are installed: at trunk line (3) setting several branch pipe(tube)s (7) straight up, spacing≤4 of adjacent branch pipe(tube) (7) meter, the end of branch pipe(tube) (7) is provided with mist vapour nozzle (8), the Way out of mist vapour nozzle (8) becomes miter angle obliquely, distance between the outer wall of mist vapour nozzle (8) and beam body (6) is 1 ± 0.1 meter, and trunk line (3), mist vapour conveyance conduit 4 usefulness thermal insulation materials wrap up;
Cover the canvas insulation layer at health canopy support (5), the canvas lower edge compresses;
Pressure boiler (1) carries mist vapour to carry out the health step, comprises quiet stage, temperature rise period, constant temperature stage and the temperature-fall period put:
Described quiet putting the stage: the quiet time of putting of wet concrete is 2～4 hours; The quiet time of putting of harsh concrete is 1 hour; The concrete in static time of putting that is mixed with retarding additive is 4～6 hours;
The described temperature rise period: carry mist vapour to heat up, beam surface programming rate is controlled in 10 ℃/h, and the heating up time is 2～3 hours;
The described constant temperature stage: the prestressed concrete health temperature remains on 30 ℃, treats that concrete crushing strength reaches 100% of design strength, enters temperature-fall period;
Described temperature-fall period: cooling rate is not more than 5 ℃/h, controls health temperature by valve control water vapour spray volume;
Remove insulation layer, remove when 100% and the curing age that concrete strength reaches design strength reaches seven days, remove health canopy support (5).
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| CN106381811A (en) * | 2016-09-18 | 2017-02-08 | 青岛林川工程技术咨询有限公司 | Equipment for insulating and curing pier column concrete in low-temperature seasons |
| CN107877681A (en) * | 2017-10-30 | 2018-04-06 | 山东高速轨道设备材料有限公司 | A kind of Maintenance in Winter method of concrete component |
| CN107916793A (en) * | 2017-12-20 | 2018-04-17 | 宁波二十冶建设有限公司 | A kind of cold weather concrete curing means |
| CN108018779A (en) * | 2017-11-30 | 2018-05-11 | 苏交科集团股份有限公司 | Concrete construction method under a kind of low temperature difference environment |
| CN108978472A (en) * | 2018-07-05 | 2018-12-11 | 中交二航局第二工程有限公司 | Maintenance process suitable for the Hanging Basket cantilever box beam winter construction of high wind area |
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| CN110181669A (en) * | 2019-05-27 | 2019-08-30 | 中国十七冶集团有限公司 | Using solar energy cyclic steam to the construction method of beam slab winter health |
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| CN113001772A (en) * | 2021-02-22 | 2021-06-22 | 中电建十一局工程有限公司 | Winter heat preservation construction method for concrete precast beam |
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| CN113370367A (en) * | 2021-06-29 | 2021-09-10 | 保利长大工程有限公司 | Combined UHPC (ultra high performance polycarbonate) curing method |
| CN113719144A (en) * | 2021-07-13 | 2021-11-30 | 中铁十九局集团有限公司 | Method for construction and maintenance of beam body in winter |
| CN115097875A (en) * | 2022-05-20 | 2022-09-23 | 湖南科技大学 | Carbon fiber electric heating-based concrete structure prestressed pipeline temperature control system and control method |
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| CN107877681A (en) * | 2017-10-30 | 2018-04-06 | 山东高速轨道设备材料有限公司 | A kind of Maintenance in Winter method of concrete component |
| CN108018779A (en) * | 2017-11-30 | 2018-05-11 | 苏交科集团股份有限公司 | Concrete construction method under a kind of low temperature difference environment |
| CN107916793A (en) * | 2017-12-20 | 2018-04-17 | 宁波二十冶建设有限公司 | A kind of cold weather concrete curing means |
| CN108978472A (en) * | 2018-07-05 | 2018-12-11 | 中交二航局第二工程有限公司 | Maintenance process suitable for the Hanging Basket cantilever box beam winter construction of high wind area |
| CN109024284A (en) * | 2018-07-09 | 2018-12-18 | 贵州新联***工程集团有限公司 | A kind of cored slab simply supported beam casting concrete cooling device |
| CN109551621A (en) * | 2018-10-09 | 2019-04-02 | 中建市政工程有限公司 | Water-saving maintenance method and maintenance device for precast beam |
| CN109571735A (en) * | 2019-02-22 | 2019-04-05 | 云南建投第十建设有限公司 | Green bio low-voltage high-temperature steam press maintenance system |
| CN110181669A (en) * | 2019-05-27 | 2019-08-30 | 中国十七冶集团有限公司 | Using solar energy cyclic steam to the construction method of beam slab winter health |
| CN110499790A (en) * | 2019-07-26 | 2019-11-26 | 国网辽宁省电力有限公司鞍山供电公司 | A kind of detection device of winter iron tower foundation construction concrete critical intensity |
| CN111364731A (en) * | 2020-03-14 | 2020-07-03 | 深圳市第一建筑工程有限公司 | Reinforced concrete ground seamless construction device and method |
| CN111364731B (en) * | 2020-03-14 | 2021-07-13 | 深圳市第一建筑工程有限公司 | Reinforced concrete ground seamless construction device and method |
| CN113001772A (en) * | 2021-02-22 | 2021-06-22 | 中电建十一局工程有限公司 | Winter heat preservation construction method for concrete precast beam |
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| CN113370367A (en) * | 2021-06-29 | 2021-09-10 | 保利长大工程有限公司 | Combined UHPC (ultra high performance polycarbonate) curing method |
| CN113370367B (en) * | 2021-06-29 | 2022-05-13 | 保利长大工程有限公司 | Combined UHPC (ultra high performance polycarbonate) curing method |
| CN113719144A (en) * | 2021-07-13 | 2021-11-30 | 中铁十九局集团有限公司 | Method for construction and maintenance of beam body in winter |
| CN115097875A (en) * | 2022-05-20 | 2022-09-23 | 湖南科技大学 | Carbon fiber electric heating-based concrete structure prestressed pipeline temperature control system and control method |
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