CN101701495A - Individualized circulation method for temperature control of bulk concrete - Google Patents
Individualized circulation method for temperature control of bulk concrete Download PDFInfo
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- CN101701495A CN101701495A CN200910272281A CN200910272281A CN101701495A CN 101701495 A CN101701495 A CN 101701495A CN 200910272281 A CN200910272281 A CN 200910272281A CN 200910272281 A CN200910272281 A CN 200910272281A CN 101701495 A CN101701495 A CN 101701495A
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Abstract
The invention relates to an individualized circulation method for the temperature control of bulk concrete. By the hydration heat development characteristics of concrete in different ages, such as an initial term, a middle term and a final term for casting the concrete, different requirements for different inner-outer temperature differences of concrete in different seasons and the temperature requirement for grouting and constructing cracks among concrete plots, the individualized circulation method is adopted in a circulation cooling process according to the temperature variance conditions of concrete in a dam so as to reduce the pulling stress in the concrete and achieve the aim of avoiding concrete cracks.
Description
Technical field
The invention belongs to the concrete in mass domain of control temperature, is the job practices of the temperature controlled individualized circulation of a kind of concrete in mass.
Technical background
In Infrastructure Field such as water conservancy, water power, municipal administration, traffic, run into the construction of concrete in mass through regular meeting.Self carry out the chemical reaction release heat of hydration because concrete has, must control, produce thermal cracking to prevent concrete in mass to the internal temperature of concrete in mass.Bury cooling water pipe underground at inside concrete and carry out the main method that the water flowing cooling is the inner concrete temperature of reduction dam body.At the development characteristic of the concrete in mass heat of hydration in the different length of time, the difference requirement of Various Seasonal internal-external temperature difference and the temperature needs that satisfy seam grouting construction between concret block, in the water flowing cooling procedure, need according to dam body inner concrete temperature variations, take individualized circulation method, reduce the tensile stress in the concrete, reach and prevent that the crack purpose from appearring in concrete.
Summary of the invention
Purpose of the present invention is exactly the temperature controlled water flowing method of concrete in mass that a kind of personalization will be provided, according to the characteristics of concrete construction and the situation of change of concrete internal temperature, initiatively adjust the layout of cooling water pipe, the water flowing flow and the water flowing time of cooling water, prevent that to reach the tensile stress that reduces in the concrete, to reach the crack purpose from appearring in concrete.
The object of the present invention is achieved like this:
The temperature controlled individualized circulation method of a kind of concrete in mass:
(1) in each concrete position in storehouse, lays cooling water pipe;
(2) promptly begin to adopt chilled water to carry out the cooling water flowing of concrete initial stage after the cooling water pipe in each concrete position in storehouse is covered by concrete;
When (3) the concrete initial stage of carrying out being cooled off water flowing, according to the different periods of concrete hydrating thermally developing, the size of adjusting the water flowing flow is with control concrete maximum temperature;
When (4) concrete being carried out cooling off water flowing mid-term, adopt than the low slightly cooling water of concrete internal temperature or river and relatively-stationary water flowing flow to cut down temperature difference between inside and outside concrete;
When (5) concrete being carried out later stage cooling water flowing, adopt the big flow of low water temperature and control the concrete internal temperature fall to make concrete internal temperature be reduced to stable temperature of concrete to carry out the joint grouting between the concret block parting;
When (6) same monolith in height being carried out the cooling water flowing of different phase, control the temperature gradient of concrete differing heights to reduce the inside concrete tensile stress by adjusting water flowing temperature, water flowing flow and concrete internal temperature fall;
(7) in concrete, bury thermometer, temperature tube equitemperature checkout facility underground, with in time, exactly the concrete internal temperature situation of change is monitored, provide foundation for adjusting cooling water flowing flow;
(8), after the concrete joint grouting construction is finished,, temperature recovery part concrete is surpassed later stage cooling water flowing according to the monitored data of thermometer in the concrete at the long characteristics of high fly ash concrete hydrating duration of the reaction.
When each concrete position in storehouse inner concrete rises layer thickness and is 2m, arrange the black iron cooling water pipe of one deck in concrete position in storehouse bottom, spacing press 1.5m and is controlled; When concrete rises layer thickness and is 3m, arrange the black iron cooling water pipe of one deck in concrete position in storehouse bottom, arrange one deck plastic cool water pipe on the horizontal plane of concreting mid-height, spacing press 2.0m control, and the high-grade concrete spacing is pressed 1.0m～1.5m and controlled.
10～12 ℃ of chilled water are adopted in the initial stage water flowing, directly logical river when river temperature is lower than 12 ℃.
When the concrete initial stage of carrying out is cooled off water flowing, the size of adjusting the water flowing flow according to the different periods of concrete hydrating thermally developing is with control concrete maximum temperature, the water flowing time at initial stage is 12～15 days, and the water flowing flow adopted 30～45L/min in preceding 5～7 days, adopted 15～25L/min afterwards.
Mid-term, adopting the water flowing flow was the river of 20～30L/min when cooling off water flowing.
Later stage adopts 10～12 ℃ of chilled water, 20～30L/min water flowing flows and controls the concrete internal temperature fall in 1 ℃/d when cooling off water flowing, makes concrete internal temperature reduce to 14～17 ℃ of stable temperature of concrete.
Carry out both sides, the irrigated area monolith of later stage cooling water flowing and go up 6m concrete water flowing cooling back internal temperature by 14～17 ℃ of controls, on the transition region concrete by 20～22 ℃ of controls.
The temperature controlled individualized circulation method of concrete in mass provided by the invention rises the different of layer thickness, strength grade of concrete and kind according to concrete construction, takes different cooling water pipe arrangements;
Promptly begin to adopt chilled water to carry out the cooling water flowing of concrete initial stage after cooling water pipe in each concrete position in storehouse is covered by concrete, and do not take concreting in the past to finish the mode that begins water flowing behind the 24h, at the beginning of building, just can control concrete temperature;
When the concrete initial stage of carrying out is cooled off water flowing, according to the different periods of concrete hydrating thermally developing, by adjusting the controlled amount system concrete maximum temperature of water flowing flow;
When concrete is carried out cooling off water flowing mid-term, by adopting than the low slightly cooling water of concrete internal temperature or river and relatively-stationary water flowing flow to cut down temperature difference between inside and outside concrete;
When concrete is carried out later stage cooling water flowing, adopt the big flow of low water temperature and control the concrete internal temperature fall to make concrete internal temperature be reduced to stable temperature of concrete to carry out the joint grouting between the concret block parting;
When same monolith is in height carried out the cooling water flowing of different phase, control the temperature gradient of concrete differing heights to reduce the inside concrete tensile stress by adjusting water flowing temperature, water flowing flow and concrete internal temperature fall;
In concrete, bury thermometer, temperature tube equitemperature checkout facility underground, with in time, exactly the concrete internal temperature situation of change is monitored, provide foundation for adjusting cooling water flowing flow;
When same monolith is in height carried out the cooling water flowing of different phase, control the temperature gradient of concrete differing heights to reduce the inside concrete tensile stress by adjusting water flowing temperature, water flowing flow and concrete internal temperature fall.Carry out both sides, the irrigated area monolith of later stage cooling water flowing and go up 6m concrete water flowing cooling back internal temperature by 14～17 ℃ of controls, on the transition region concrete by 20～22 ℃ of controls, the temperature control of the concrete on top after again by initial stage cooling water flowing, form like this one from bottom to top, the temperature gradient field of temperature reasonable link from low to high.
By above measure, build the ground dam body and the crack do not occur.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is that concrete typical case of the present invention storehouse face cooling water pipe is arranged schematic diagram.
Among the figure, 1, water inlet, 2, delivery port, 3, cooling water pipe.
The specific embodiment
In certain dam concrete construction process, the different periods that rise layer thickness, concrete grade, grating and concrete hydrating thermally developing according to concrete have been carried out personalized cooling water flowing, have guaranteed that the crack does not appear in dam concrete.Concrete measure is as follows:
(1) differently determines different cooling water pipe arrangements according to what concrete rose layer thickness, concrete grade and kind.When the inner concrete of dam body rises layer thickness and is 2m, arrange the black iron cooling water pipe of one deck in concrete position in storehouse bottom, spacing is pressed 1.5m and is controlled; When concrete rises layer thickness and is 3m, arrange the black iron cooling water pipe of one deck in concrete position in storehouse bottom, arrange one deck plastic cool water pipe on the horizontal plane of concreting mid-height, spacing press 2.0m and is controlled.The high-grade concrete spacing is pressed 1.0m～1.5m control, and cooling water flows into from water inlet 1, flows out from delivery port 2.
(2) promptly begin to adopt chilled water to carry out the cooling water flowing of concrete initial stage after the cooling water pipe in each concrete position in storehouse is covered by concrete, and do not take concreting in the past to finish the mode that begins water flowing behind the 24h.10～12 ℃ of chilled water are adopted in the initial stage water flowing, directly logical river when river temperature is lower than 12 ℃,
When (3) the concrete initial stage of carrying out being cooled off water flowing, the size of adjusting the water flowing flows according to the different periods of concrete hydrating thermally developing is with control concrete maximum temperature.The water flowing time at initial stage was generally 12～15 days.The water flowing flow adopted 30～45L/min in preceding 5～7 days, adopted 15～25L/min afterwards.
When (4) concrete being carried out cooling off water flowing mid-term, employing water flowing flow is that the river water flowing about 20～30L/min is cooled off to cut down temperature difference between inside and outside concrete.
When (5) concrete being carried out later stage cooling water flowing, adopt 10～12 ℃ of chilled water, 20～30L/min water flowing flows and control the concrete internal temperature fall in 1 ℃/d, make concrete internal temperature reduce to 14～17 ℃ of stable temperature of concrete to carry out the joint grouting of dam concrete T-joining.
When (6) same monolith in height being carried out the cooling water flowing of different phase, control the temperature gradient of concrete differing heights to reduce the inside concrete tensile stress by adjusting water flowing temperature, water flowing flow and concrete internal temperature fall.Carry out both sides, the irrigated area monolith of later stage cooling water flowing and go up 6m concrete water flowing cooling back internal temperature by 14～17 ℃ of controls, on the transition region concrete by 20～22 ℃ of controls, the temperature control of the concrete on top after again by initial stage cooling water flowing, form like this one from bottom to top, the temperature gradient field of temperature reasonable link from low to high.
(7) in dam concrete, sufficient thermometer, temperature tube equitemperature checkout facility have all been buried underground according to each dam block concrete different labels, different gradation, different types of situation, with in time, grasped the concrete internal temperature situation of change exactly, provide foundation for adjusting cooling water flowing flow.
Claims (7)
1. the temperature controlled individualized circulation method of concrete in mass is characterized in that:
(1) in each concrete position in storehouse, lays cooling water pipe;
(2) promptly begin to adopt chilled water to carry out the cooling water flowing of concrete initial stage after the cooling water pipe in each concrete position in storehouse is covered by concrete;
When (3) the concrete initial stage of carrying out being cooled off water flowing, according to the different periods of concrete hydrating thermally developing, the size of adjusting the water flowing flow is with control concrete maximum temperature;
When (4) concrete being carried out cooling off water flowing mid-term, adopt than the low slightly cooling water of concrete internal temperature or river and relatively-stationary water flowing flow to cut down temperature difference between inside and outside concrete;
When (5) concrete being carried out later stage cooling water flowing, adopt the big flow of low water temperature and control the concrete internal temperature fall to make concrete internal temperature be reduced to stable temperature of concrete to carry out the joint grouting between the concret block parting;
When (6) same monolith in height being carried out the cooling water flowing of different phase, control the temperature gradient of concrete differing heights to reduce the inside concrete tensile stress by adjusting water flowing temperature, water flowing flow and concrete internal temperature fall;
(7) in concrete, bury thermometer, temperature tube equitemperature checkout facility underground, with in time, exactly the concrete internal temperature situation of change is monitored, provide foundation for adjusting cooling water flowing flow;
(8), after the concrete joint grouting construction is finished,, temperature recovery part concrete is surpassed later stage cooling water flowing according to the monitored data of thermometer in the concrete at the long characteristics of high fly ash concrete hydrating duration of the reaction.
2. the temperature controlled individualized circulation method of concrete in mass according to claim 1 is characterized in that: when each concrete position in storehouse inner concrete rises layer thickness and is 2m, arrange the black iron cooling water pipe of one deck in concrete position in storehouse bottom, spacing press 1.5m and is controlled; When concrete rises layer thickness and is 3m, arrange the black iron cooling water pipe of one deck in concrete position in storehouse bottom, arrange one deck plastic cool water pipe on the horizontal plane of concreting mid-height, spacing press 2.0m control, and the high-grade concrete spacing is pressed 1.0m～1.5m and controlled.
3. the temperature controlled individualized circulation method of concrete in mass according to claim 1 is characterized in that: 10～12 ℃ of chilled water are adopted in the initial stage water flowing, directly logical river when river temperature is lower than 12 ℃.
4. the temperature controlled individualized circulation method of concrete in mass according to claim 1 and 2, it is characterized in that: when the concrete initial stage of carrying out is cooled off water flowing, the size of adjusting the water flowing flow according to the different periods of concrete hydrating thermally developing is with control concrete maximum temperature, the water flowing time at initial stage is 12～15 days, the water flowing flow adopted 30～45L/min in preceding 5～7 days, adopted 15～25L/min afterwards.
5. the temperature controlled individualized circulation method of concrete in mass according to claim 1 is characterized in that: mid-term, adopting the water flowing flow was the river of 20～30L/min when cooling off water flowing.
6. the temperature controlled individualized circulation method of concrete in mass according to claim 1, it is characterized in that: the later stage is when cooling off water flowing, adopt 10～12 ℃ of chilled water, 20～30L/min water flowing flows and control the concrete internal temperature fall in 1 ℃/d, make concrete internal temperature reduce to 14～17 ℃ of stable temperature of concrete.
7. according to claim 1 or the temperature controlled individualized circulation method of 6 described concrete in masss, it is characterized in that: carry out both sides, the irrigated area monolith of later stage cooling water flowing and go up 6m concrete water flowing cooling back internal temperature by 14～17 ℃ of controls, on the transition region concrete by 20～22 ℃ of controls.
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| CN114091144A (en) * | 2021-11-01 | 2022-02-25 | 中南大学 | Concrete hydration heat temperature monitoring method and system |
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