CN104264678A - Mass concrete cracking proof construction technology - Google Patents
Mass concrete cracking proof construction technology Download PDFInfo
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- CN104264678A CN104264678A CN201410547406.1A CN201410547406A CN104264678A CN 104264678 A CN104264678 A CN 104264678A CN 201410547406 A CN201410547406 A CN 201410547406A CN 104264678 A CN104264678 A CN 104264678A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The invention discloses a mass concrete cracking proof construction technology which can prevent the concrete from cracking and improve the concrete pouring quality. The mass concrete cracking proof construction technology comprises the following steps of firstly building a steel reinforcement framework and a template, then selecting the type and the ratio of the concrete, pouring the concrete, regulating the internal and external temperature difference and the maximum temperature of the concrete after concrete pouring is achieved; cooling the concrete by water-passing cooling, when the internal and external temperature difference of the concrete cannot be smaller than 25 DEG C by the water-passing cooling, reducing the internal and external temperature difference of the concrete by rising the temperature of the exterior of the concrete and maintaining naturally concrete temperature reducing when the internal and external temperature difference is smaller than 25 DEG C and the internal maximum temperature is smaller than 50 DEG C; removing the template when the concrete temperature is not changed to achieve construction of the concrete. According to the mass concrete cracking proof construction technology, cracking during a solidification process of the concrete is effectively avoided and the concrete quality is improved.
Description
Technical field
The present invention relates to a kind of concrete construction technology, especially a kind of concrete in mass Anti-cracking construction technology.
Background technology
Known: along with the progress of society and the development of science and technology, in Process of Engineering Construction, mass concrete construction is more and more common, construction technical requirement is higher, and difficulty of construction increases, and the temperature difference that will prevent concrete from causing because of hydration heat of cement especially in construction produces thermal stress cracks.Therefore us are needed to make great efforts to improve construction technology and quality, ensure engineering safety and the construction quality of mass concrete engineering, need from Material selec-tion, the relevant link such as technical measures carries out sufficient preparation, the construction of guarantee concrete in mass.Especially concrete is in the control of casting complete concrete temperature, if concrete inside and outside temperature difference is comparatively large, concrete can produce crack in process of setting; Concrete quality can not be effectively guaranteed.
Existing concrete construction process: after pouring concrete completes, by carrying out water flowing cooling to concrete and arranging insulation layer at concrete side, thus regulate the maximum temperature of concrete inside concrete and outside temperature difference and inside concrete after casting complete.
1, construction technology process: concrete raw material selection → optimization of mix proportion → establish isolation bed course → basic unwrapping wire → reinforcing bar binding → installation circulating cooling water pipe → installation form → add insulation layer → pouring concrete → concrete curing and temperature controls.
2, Material selec-tion: the mainly quality control of Admixture, thick, fines.
3, mix-design.
4, concrete out-of-machine temperature and placing temperature is controlled.
5, bed course and separation layer construction: in order to reduce basic unit to the concrete restraint forces in top, after the suitable maintenance of concrete bed course, the oily separation layer of a felt two (now burning cast-in-place) of constructing, then carries out foundation location work.
6, formwork and formwork supports: according to actual loading situation to template longitudinally and vertical back of the body a tree, used in making timber for boats specification and spacing, the materials of template outside-supporting and spacing etc. are determined by the concrete maximum lateral pressure of calculating gained, and reinforce.
7, concrete in mass stirring, transport, build: concrete stirring technique adopts the mortar of secondary batching to wrap up in stone or stone enveloped with cement stirring technique.Concrete transport adopts 6m
3agitator truck.Concrete cast is put in storage and is adopted the conveying of HB60C-1413 concrete mixer to put in storage, and ensures that concrete continuous is continual and builds.Select the construction of sloping concreting in lifts method, can not pause in centre, avoid out cold seam.To the concrete after building, before vibration mark, give secondary vibration.
8, concrete bleeding process: concrete is being built, vibrated in process, and a small amount of bleeding is rushed to foundation ditch top along with concreting is pushed ahead, and is drained into outside hole by the preformed hole of template bottom, top.
9, concrete surfacing
For ensureing concrete surface planeness, in template or Steel bar rack top level gauge enough casting area elevation control lines are set, first draw wide line when receiving face, adopt that guiding ruler, wood float are floating, compacting, then receive light with plasterer's trowel.If top of concrete laitance is many, pour the unnecessary bleeding of rear removing, laitance, rearrange concrete and receive face.
Concrete maintenance: according to the regulation of " concrete engineering construction and standards of acceptance " (GB50204-2002), use covered rearing with plastic film water-preserving curing in 12 hours after concreting, prevent moisture from evaporating.Also be incubated with straw mattress, cotton-wool when climate temperature is very low.
Mass concrete construction shortcoming: at intensification and temperature-fall period, external crack and shrinking cracks easily occur, through crack, deeper clefts and external crack are divided in these cracks.Through crack develops into deeper clefts by concrete surface crack, finally forms through crack, and globality and the stability of structure may be destroyed in this crack, and its harmfulness is comparatively large, and other two kinds of the damage of cracks are less.So perform maintenance, insulation and temperature control measures after concreting is complete.
Summary of the invention
Technical problem to be solved by this invention is to provide one and prevents concrete cracking, improves the concrete in mass Anti-cracking construction technology of pouring concrete quality.
The technical solution adopted for the present invention to solve the technical problems is: concrete in mass Anti-cracking construction technology, comprises the following steps successively:
A, according to concrete in mass design and construction drawing, the good structure reinforcing bars of fabrication and installation is also reinforced by design scheme requirement cage of reinforcement, reinforcement installation complete and qualified by inspection after around it, set up template by design drawing, and to reinforce; Described template surrounds pouring concrete district;
Simultaneously according to the absolute altitude on design and construction drawing, set temperature survey mark; The pre-buried temperature tube of each temperature measuring point in pouring area;
B, according to the technical requirements of concrete in mass, concrete in mass material and mixing ratio to be selected, select to carry out mix-design with the concrete of technology, designing requirement same intensity grade; Then in concrete, selected match ratio fusion II grade of flyash and retarding-type superplasticizer is pressed;
C, by pouring concrete mixed in step B in pouring concrete district, require that disposable continuous pouring completes;
After D, pouring concrete complete, detected once concrete temperature, according to detecting that concrete inside and outside temperature difference and inside concrete maximum temperature regulate and control concrete temperature at interval of 2 hours;
After pouring concrete completes 6 hours, first water flowing cooling is carried out to concrete, measured once the concrete temperature of each survey mark at interval of 2 hours by temperature tube simultaneously;
When temperature difference between inside and outside concrete is greater than 25 DEG C in continuous 12 hours; Then heated up in concrete outside; Until concrete inside and outside temperature difference is less than 25 DEG C; Concrete outside is stopped to heat up; Then lower the temperature to mixed earth, namely carry out water flowing cooling to concrete, keep temperature difference between inside and outside concrete to be less than 25 DEG C, the inner highest temperature is less than or equal to 75 DEG C;
E, when temperature difference between inside and outside concrete is less than 25 DEG C, inner maximum temperature is less than 50 DEG C, and in adjacent twice mixed earth temperature detection after one-time detection to concrete internal temperature obtain lower than front one-time detection internal temperature time, stop water flowing cooling;
F, concrete surface lay double-layer films, two-layer cotton felt; Take masterplate apart, plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall;
G is until concrete inside and outside temperature difference and inside concrete maximum temperature detected not when changing, and stripping completes concrete construction.
Further, take ramp type thin layer to water to smash to carry out continuously in step C in the process of cast.
Preferably, heat up in the following ways to concrete outside in step D: by concrete arranged outside electric heating device or iodine-tungsten lamp, heated up in concrete outside.
Preferably, in step 1) in pouring area pre-buried three temperature tubes of each temperature measuring point;
In step 4) in detect concrete temperature in the following ways, the data that three temperature tube measurements of temperature measuring point obtain are averaged, obtain the actual temperature of this temperature measuring point.
The invention has the beneficial effects as follows: concrete in mass Anti-cracking construction technology provided by the invention by selecting materials to concrete and fusion II grade of flyash, retarding-type superplasticizer before pouring concrete; Thus reduce concrete water supply volume, ensure the intensity after concrete setting; After concreting completes, concrete setting produces in the process of the heat of hydration at inside concrete and controls concrete inside and outside temperature difference and inside concrete maximum temperature; When concrete inside and outside temperature difference is larger, heats up by carrying out outside to the heater of concrete outer setting or tungsten filament lamp to concrete, thus reduce internal-external temperature difference, avoid occurring crackle in concrete setting process, ensure concrete quality.Be less than 25 DEG C in the inside and outside temperature difference simultaneously, when inner maximum temperature is less than 50 DEG C, lay double-layer films, two-layer cotton felt at concrete surface; Plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall.Thus concrete natural coagulation can be ensured, ensure concrete internal soundness.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Concrete in mass Anti-cracking construction technology, comprises the following steps successively:
A, according to concrete in mass design and construction drawing, the good structure reinforcing bars of fabrication and installation is also reinforced by design scheme requirement cage of reinforcement, reinforcement installation complete and qualified by inspection after around it, set up template by design drawing, and to reinforce; Described template surrounds pouring concrete district;
Simultaneously according to the absolute altitude on design and construction drawing, set temperature survey mark; The pre-buried temperature tube of each temperature measuring point in pouring area;
B, according to the technical requirements of concrete in mass, concrete in mass material and mixing ratio to be selected, select to carry out mix-design with the concrete of technology, designing requirement same intensity grade; Then in concrete, selected match ratio fusion II grade of flyash and retarding-type superplasticizer is pressed;
C, by pouring concrete mixed in step B in pouring concrete district, require that disposable continuous pouring completes;
After D, pouring concrete complete, detected once concrete temperature, according to detecting that concrete inside and outside temperature difference and inside concrete maximum temperature regulate and control concrete temperature at interval of 2 hours;
After pouring concrete completes 6 hours, first water flowing cooling is carried out to concrete, measured once the concrete temperature of each survey mark at interval of 2 hours by temperature tube simultaneously;
When temperature difference between inside and outside concrete is greater than 25 DEG C in continuous 12 hours; Then heated up in concrete outside; Until concrete inside and outside temperature difference is less than 25 DEG C; Concrete outside is stopped to heat up; Then lower the temperature to mixed earth, namely carry out water flowing cooling to concrete, keep temperature difference between inside and outside concrete to be less than 25 DEG C, the inner highest temperature is less than or equal to 75 DEG C;
E, when temperature difference between inside and outside concrete is less than 25 DEG C, inner maximum temperature is less than 50 DEG C, and in adjacent twice mixed earth temperature detection after one-time detection to concrete internal temperature obtain lower than front one-time detection internal temperature time, stop water flowing cooling;
F, concrete surface lay double-layer films, two-layer cotton felt; Take masterplate apart, plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall;
G is until concrete inside and outside temperature difference and inside concrete maximum temperature detected not when changing, and stripping completes concrete construction.
In step according to concrete in mass design and construction drawing, the good structure reinforcing bars of fabrication and installation is also reinforced by protocols call cage of reinforcement (steel bar horse-shaped bench), and local area need reinforce with steel pipe; Reinforcement installation complete and qualified by inspection after around it, set up template by design drawing, and to reinforce; Described template surrounds pouring concrete district; First set up cage of reinforcement and template according to design and construction drawing, thus be the ready work of concrete cast.According to design and construction drawing, carry out setting up of cage of reinforcement and masterplate and can ensure the concrete size conforms designing requirement after pouring into a mould.
Simultaneously pre-buried temperature tube in the cast region of mixed earth, thus make to measure inside concrete and outside temperature accurately in the process of concrete setting.
In stepb concrete raw material are selected according to designing requirement, select suitable raw material and proportioning, can ensure pouring concrete complete after intensity and rigidity.Wherein flyash receives to catch the thin ash got off from the flue gas after coal combustion, and flyash is the primary solids refuse that coal-burning power plant discharges.The main oxides of power plants flyash consists of: SiO
2, Al
2o
3, FeO, Fe
2o
3, CaO, TiO
2deng.II grade of flyash refers to that the parameters of flyash meets the flyash of national II grade standard.In concrete, admixture II grade of flyash can save a large amount of cement and fines; Decrease water supply volume; Improve the workability of concrete batching system; The reliability of Concrete Structure; Decrease concrete creeping; Reduce the heat of hydration, heat energy dilatancy; Improve concrete impervious ability; Increase concrete durability.Wherein retarding-type superplasticizer is based on naphthalenesulfonic acid-formaldehyde condensate, then compound kinds of surface active material and the retarding-type superplasticizer made.Its water-reducing rate is high, fluidity good, and Slump Time losing of Large is little, does not emanate, not bleeding.Simultaneously can increase substantially concrete mobility and each age strength, especially later strength has and significantly strengthens effect.Retarding-type superplasticizer outward appearance powder yellowish-brown powder pH value 7-9, liquid brown liquid, density is 1.20 ± 0.02 (g/ml), moisture content≤10%, and without chlorion, fineness is 0.315, tail over≤12%, foam time≤30 second.
In step C by concreting mixed in step B in pouring concrete district, require that disposable continuous pouring completes.Owing to adopting disposable continuous pouring to complete, concrete globality and design strength and rigidity can be ensured, not easily occur crackle.
In step D, after pouring concrete completes, the heat of hydration is generally not too large, and namely internal-external temperature difference is also not too large, does not need cooling, but will carry out the measure of insulation overlay film, and strengthens thermometric; Once concrete temperature is detected, according to detecting that concrete inside and outside temperature difference and inside concrete maximum temperature regulate and control concrete temperature at interval of 2 hours;
After pouring concrete completes 6 hours, first water flowing cooling is carried out to concrete, within every 2 hours simultaneously, survey once concrete temperature;
When temperature difference between inside and outside concrete is greater than 25 DEG C in continuous 12 hours; Then stop water flowing cooling, start the electric heating device outside concrete or iodine-tungsten lamp; Heated up in concrete outside; Until concrete inside and outside temperature difference is less than 25 DEG C; Concrete outside is stopped to heat up; Then lower the temperature to mixed earth, namely carry out water flowing cooling to concrete, keep temperature difference between inside and outside concrete to be less than 25 DEG C, the inner highest temperature is less than or equal to 75 DEG C;
Concrete inside concrete after casting complete can form the heat of hydration, and concrete temperature can change along with the increase of the heat of hydration.Because inside concrete heat radiation is slower; External cooling is fast, and therefore concrete internal-external temperature difference can become large along with the increase of the heat of hydration; Concrete internal temperature also can raise.Concrete internal temperature is too high, and concrete internal and external temperature more easily forms the larger temperature difference.Concrete internal-external temperature difference is excessive, and concrete can be caused in the process of solidifying to occur crackle.
Therefore after 6 hours, first water flowing cooling is carried out to concrete at casting complete in step D, monitor concrete temperature simultaneously.Due in after pouring concrete completes 6 hours of concrete, the heat of hydration is generally not too large, and namely internal-external temperature difference is also not too large, does not need cooling, and after 6 hours, the heat of hydration starts to strengthen, and temperature difference between inside and outside concrete also progressively strengthens; Therefore need to be cooled by water flowing to accelerate concrete heat radiation, ensure that internal-external temperature difference is unsuitable excessive.
Due to concreting complete after can produce the heat of hydration in the process of solidifying, concrete is outside large with extraneous contact area; Very fast temperature of dispelling the heat is lower, and internal heat dissipating is slow, and temperature is higher, and therefore, the temperature impact of logical water-cooled starting stage on concrete outside is little, mainly accelerates inside concrete heat and externally dispels the heat; Thus reduce the temperature difference of concrete internal temperature and concrete inside and outside.
Known, concrete concrete internal-external temperature difference in the process of solidifying should not be greater than 25 DEG C; When temperature difference between inside and outside concrete is greater than 25 DEG C, easily there is crackle in concrete in the process of solidifying, and reduces concrete quality.When concrete continues to solidify, the heat of hydration that inside concrete produces increases, and when water flowing cooling makes the speed of concrete cooling be less than hastening of concrete internal temperature rising, concrete internal and external temperature missionary society increases.In water flowing cooling procedure, when concrete inside and outside temperature difference cannot be ensured for being less than 25 DEG C, stop water flowing cooling.Heated up in concrete outside; Until concrete inside and outside temperature difference is less than 25 DEG C.Although carry out intensification to concrete outside can raise concrete external temperature; But because concrete external temperature is lower than internal temperature, the heat of hydration that inside concrete produces still externally dispels the heat, therefore, it is possible to reduce concrete inside and outside temperature difference.In the process that concrete external temperature is heated up, concrete outside is heated to the speed that just slow down concrete external cooling, and the temperature of concrete outside is lower than concrete internal temperature, inside concrete still can externally dispel the heat, the radiating rate of inside concrete will be greater than external cooling speed, thus minimizing temperature difference between inside and outside concrete ensures that concrete not easily occurs crackle in process of setting, ensures concrete quality.
In order to ensure that the duration ensures concrete normal freezing simultaneously, avoid concrete in process of setting because the impact of temperature suppresses the development of concrete strength, even make concrete brittle, produce inner microcrack, have a strong impact on concrete inherent quality.When concrete internal-external temperature difference is less than 25 DEG C, concrete outside is stopped to heat up; Carry out water flowing cooling to concrete, keep temperature difference between inside and outside concrete to be less than 25 DEG C, the inner highest temperature is less than or equal to 75 DEG C.
By the detection to concrete temperature in step D, the temperature of concrete inside and outside temperature difference and inside concrete is strictly controlled thus ensures not easily to occur crackle in the process of concrete setting, improves concrete quality simultaneously.
In step e and step F, when temperature difference between inside and outside concrete is less than 25 DEG C, inner maximum temperature is less than 50 DEG C, and in adjacent twice mixed earth temperature detection after one-time detection to concrete internal temperature obtain lower than front one-time detection internal temperature time, stop water flowing cooling; Double-layer films, two-layer cotton felt is laid at concrete surface; Plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall.Described between concrete side and template plastic lining foam heat-insulating board refer to and first take masterplate apart, then plastic foam warming plate is installed and again template is restored.By above-mentioned steps, thus it is too fast to avoid concrete temperature reduction in process of setting, and after causing concrete setting, intensity is lower, and producing internal fissure affects concrete inherent quality.When temperature difference between inside and outside concrete is less than 25 DEG C, inner maximum temperature is less than 50 DEG C, by laying double-layer films, two-layer cotton felt and plastic lining foam heat-insulating board between concrete side and template at concrete surface.Make concrete under the impact not being subject to ambient temperature, Temperature fall.The internal soundness after concrete setting can be ensured, improve concrete total quality.
In step G, until concrete inside and outside temperature difference and inside concrete maximum temperature detected not when changing, stripping completes concrete construction.
Concrete in mass Anti-cracking construction technology of the present invention by selecting materials to concrete and fusion II grade of flyash, retarding-type superplasticizer before pouring concrete in sum; Thus reduce concrete water supply volume, ensure the intensity after concrete setting; After concreting completes, concrete setting produces in the process of the heat of hydration at inside concrete and controls concrete inside and outside temperature difference and inside concrete maximum temperature; When concrete inside and outside temperature difference is larger, heats up by carrying out outside to the heater of concrete outer setting or tungsten filament lamp to concrete, thus reduce internal-external temperature difference, avoid occurring crackle in concrete setting process, ensure concrete quality.Be less than 25 DEG C in the inside and outside temperature difference simultaneously, when inner maximum temperature is less than 50 DEG C, lay double-layer films, two-layer cotton felt at concrete surface; Plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall.Thus concrete natural coagulation can be ensured, ensure concrete internal soundness.
In order to make the flowing of coagulation in concreting process smooth and easy, not needing to carry out lasting watering and smashing; Further in step C, in the process of cast, take ramp type thin layer to water to smash to carry out continuously.Utilize nature trickling to form slope and increase concrete mobility; Avoid concrete to pile up too high, produce the too high heat of hydration.
In step D, intensification is carried out to concrete outside and can adopt various ways, in order to cost-saving, convenient operation.Wherein preferred mode is: heated up to concrete outside by concrete arranged outside electric heating device or iodine-tungsten lamp.Concrete arranged outside electric heating device after casting complete or iodine-tungsten lamp; When temperature difference between inside and outside concrete is greater than 25 DEG C in continuous 12 hours; Start the electric heating device outside concrete or iodine-tungsten lamp; Heated up in concrete outside.Heat up to concrete outside by the way, easy for installation, simple to operate, cost is lower.
Accurate, concrete in order to make concrete temperature monitoring, in step 1) in pouring area pre-buried three temperature tubes of each temperature measuring point; In step 4) in detect concrete temperature in the following ways, the data that three temperature tube measurements of temperature measuring point obtain are averaged, obtain the actual temperature of this temperature measuring point.The monitoring that temperature tube can ensure concrete temperature is everywhere set at different level place, at each survey mark, multiple temperature tube is installed simultaneously, measured value is averaged, thus the temperature that survey mark can be made to monitor is accurate.
Embodiment
The construction of Foundation of Steam Turbogenerater Technology of Mass Concrete for Base Plate
Foundation of Steam Turbogenerater base plate is rectangular shape, and appearance and size is: length × wide × thick=34.6m × 12.8m × 2.5m, end absolute altitude Wei – 6.0m, and top mark height is-3.50m, thickness of slab 2.5m; Base plate is integral cast-in-situ reinforced concrete structure, and strength grade of concrete is C30 (seepage-resistant grade is S6); Concrete square amount is about 1111m
3.
Carry out as follows in work progress:
1, according to concrete in mass design and construction drawing, cage of reinforcement has been set up; Template is set up according to construction drawing around cage of reinforcement; Described template surrounds the pouring concrete district of length × wide × thick=34.6m × 12.8m × 2.5m.
2, according to the technical requirements of concrete in mass, concrete in mass material and mixing ratio is selected, select the concrete with technical requirements same intensity grade; Then in concrete, selected match ratio fusion II grade of flyash and retarding-type superplasticizer is pressed.This project Foundation of Steam Turbogenerater back-plane design strength grade of concrete is C30, and seepage-resistant grade is S6, and freeze proof grade is F50, and the slump is 140 ~ 160mm, and concrete square amount is about 1111m
3, the engineering time, temperature was 5 ~ 28 DEG C in the September, and adopt machine mixing, vibrate, cement: P.042.5R, river grain fineness number modulus is 2, and rubble is 5 ~ 31.5mm.Match ratio is: cement: flyash: fines (sand): coarse aggregate (rubble): water: Admixture=364:91:351:1052:182:9.1.Admixture is naphthalene series high-efficiency water-reducing agent, and match ratio material therefor all meets national rule code requirement.
3, by mixed concreting in pouring concrete district, concrete cast adopts ramp type thin layer to water and smashes, and waters to smash and carries out continuously, utilizes nature to trickle to form slope and should adopt an effective measure to prevent concrete from reinforcing bar is pushed away design attitude.Avoid concrete to pile up too high, produce the too high heat of hydration.Strengthen concrete vibrating and surface compaction work simultaneously thus improve concrete compactness and tensile strength, preventing concrete surface shrinkage crack.
4, temperature monitoring and temperature adjusting are carried out to the concrete after casting complete
4.1 concrete arranged outside electric heating devices after casting complete or iodine-tungsten lamp, at steam turbine sole plate peace temperature tube, arrange 6 groups by differing heights, often organize three thermometric sensing chips.Special arrangement 2 ~ 3 thermometric personnel take turns at keeping watch, and detects once concrete temperature, make a record, carry out every day gathering, analyzing to every data at interval of 2 hours, makes adjustment in time to cooling Insulation.
4.2 according to detecting that concrete inside and outside temperature difference and inside concrete maximum temperature regulate and control concrete temperature;
In 6 hours after pouring concrete completes, the heat of hydration is not too large, and namely internal-external temperature difference is also not too large, does not need cooling, and after pouring concrete completes 6 hours, the heat of hydration starts to strengthen, and first carries out water flowing cooling to concrete, monitors concrete temperature simultaneously;
When temperature difference between inside and outside concrete is greater than 25 DEG C; Then stop water flowing cooling, start the electric heating device outside concrete or iodine-tungsten lamp; Heated up in concrete outside; Until concrete inside and outside temperature difference is less than 25 DEG C; Concrete outside is stopped to heat up; Carry out water flowing cooling to concrete, keep temperature difference between inside and outside concrete to be less than 25 DEG C, the inner highest temperature is less than or equal to 75 DEG C.
Rigorous concentration variations in temperature, does not allow cooling too fast, especially in the temperature rise period just starting 1 ~ 3 day, the temperature difference should be kept steadily increasing, otherwise will the development of concrete strength be suppressed, and even make concrete embrittlement, produce inner microcrack, have a strong impact on concrete inherent quality.
5, when temperature difference between inside and outside concrete is less than 25 DEG C, inner maximum temperature is less than 50 DEG C, stops water flowing cooling; Double-layer films, two-layer cotton felt is laid at concrete surface; Plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall.
6 until detect concrete inside and outside temperature difference and inside concrete maximum temperature not when changing, and stripping completes concrete construction.
By application concrete in mass Anti-cracking construction technology of the present invention in Foundation of Steam Turbogenerater mass concrete of basement foundation plate process described in the present embodiment, temperature is made in concrete setting process to control flawless after proper, concrete formation, ensure that the quality of construction, shorten simultaneously and build the duration, reduce construction cost.
Claims (4)
1. concrete in mass Anti-cracking construction technology, is characterized in that, comprises the following steps successively:
A, according to concrete in mass design and construction drawing, the good structure reinforcing bars of fabrication and installation is also reinforced by design scheme requirement cage of reinforcement, reinforcement installation complete and qualified by inspection after around it, set up template by design drawing, and to reinforce; Described template surrounds pouring concrete district;
Simultaneously according to the absolute altitude on design and construction drawing, set temperature survey mark; The pre-buried temperature tube of each temperature measuring point in pouring area;
B, according to the technical requirements of concrete in mass, concrete in mass material and mixing ratio to be selected, select to carry out mix-design with the concrete of technology, designing requirement same intensity grade; Then in concrete, selected match ratio fusion II grade of flyash and retarding-type superplasticizer is pressed;
C, by pouring concrete mixed in step B in pouring concrete district, require that disposable continuous pouring completes;
After D, pouring concrete complete, detected once concrete temperature at interval of 2 hours, according to the concrete inside and outside temperature difference detected and inside concrete maximum temperature, concrete temperature is regulated and controled;
After pouring concrete completes 6 hours, first water flowing cooling is carried out to concrete, measured once the concrete temperature of each survey mark at interval of 2 hours by temperature tube simultaneously;
When temperature difference between inside and outside concrete is greater than 25 DEG C in continuous 12 hours; Then heated up in concrete outside; Until concrete inside and outside temperature difference is less than 25 DEG C; Concrete outside is stopped to heat up; Then lower the temperature to mixed earth, namely carry out water flowing cooling to concrete, keep temperature difference between inside and outside concrete to be less than 25 DEG C, the inner highest temperature is less than or equal to 75 DEG C;
E, when temperature difference between inside and outside concrete is less than 25 DEG C, inner maximum temperature is less than 50 DEG C, and in adjacent twice mixed earth temperature detection after one-time detection to concrete internal temperature obtain lower than front one-time detection internal temperature time, stop water flowing cooling;
F, concrete surface lay double-layer films, two-layer cotton felt; Take masterplate apart, plastic lining foam heat-insulating board between concrete side and template; Keep Temperature fall;
G is until concrete inside and outside temperature difference and inside concrete maximum temperature detected not when changing, and stripping completes concrete construction.
2. concrete in mass Anti-cracking construction technology as claimed in claim 1, is characterized in that: in the process of cast, take ramp type thin layer to water in step C to smash to carry out continuously.
3. concrete in mass Anti-cracking construction technology as claimed in claim 2, be is characterized in that: heat up in the following ways to concrete outside in step D: heated up to concrete outside by concrete arranged outside electric heating device or iodine-tungsten lamp.
4. concrete in mass Anti-cracking construction technology as claimed in claim 2, is characterized in that: in step 1) in pouring area pre-buried three temperature tubes of each temperature measuring point;
In step 4) in detect concrete temperature in the following ways, the data that three temperature tube measurements of temperature measuring point obtain are averaged, obtain the actual temperature of this temperature measuring point.
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| WO2016127408A1 (en) * | 2015-02-13 | 2016-08-18 | 南通大学 | Electronic temperature measuring construction method for massive concrete |
| CN106363790A (en) * | 2016-10-25 | 2017-02-01 | 河北晶通建筑科技股份有限公司 | Manufacturing technique for precast concrete components |
| CN108018968A (en) * | 2017-10-26 | 2018-05-11 | 重庆建工第三建设有限责任公司 | A kind of panel wall construction method for linear accelerator machinery room |
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| CN111037706A (en) * | 2019-12-25 | 2020-04-21 | 合肥中民筑友智造科技有限公司 | Novel PC component forming method |
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| CN113955988A (en) * | 2021-10-18 | 2022-01-21 | 浙江艮威水利建设有限公司 | Large-volume concrete block, pouring construction method and poured dam |
| CN113955988B (en) * | 2021-10-18 | 2022-09-23 | 浙江艮威水利建设有限公司 | Large-volume concrete block, pouring construction method and poured dam |
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