CN103913514A - Method for monitoring temperature and gradient cracks of large-volume concrete - Google Patents
Method for monitoring temperature and gradient cracks of large-volume concrete Download PDFInfo
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- CN103913514A CN103913514A CN201310002072.5A CN201310002072A CN103913514A CN 103913514 A CN103913514 A CN 103913514A CN 201310002072 A CN201310002072 A CN 201310002072A CN 103913514 A CN103913514 A CN 103913514A
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Abstract
The invention relates to a method for monitoring temperature and gradient cracks of large-volume concrete, which is characterized in that a temperature sensor (3) and an acoustic emission sensor (4) are embedded for monitoring the temperature gradient and temperature cracks of the large-volume concrete (1); the temperature sensor (3) is connected to a digital temperature record device (5), the acoustic emission sensor (4) is connected to an acoustic emission monitoring device (6); the temperature sensor (3) is used for monitoring the temperature gradient, the acoustic emission sensor (4) is used for monitoring of the large-volume concrete and positioning the cracks; before concrete pouring and after erecting a structural steel bar(2), the temperature sensor (3) and the acoustic emission sensor (4) are respectively pasted on the side surface of the structural steel bar(2) by resin, the surfaces of the temperature sensor (3) and the acoustic emission sensor (4) are coated with resin for water repellent treatment, wherein the temperature is monitored by the digital temperature record device (5), and the sound emission signals are recorded and analyzed by the acoustic emission monitoring device (6).
Description
Technical field
The invention belongs to concrete temperature monitoring technical field, specifically a kind of mass concrete temperature gradient Crack Monitoring method.
Background technology
An importance of mass concrete engineering quality control is temperature control.Concrete is a kind of bad Heat Conduction Material, and in mass concrete, internal heat is difficult for distributing, and can form higher hydration heat temperature rise.In temperature-fall period, because non-homogeneous cooling is subject to self constraint and external constraint.Self retrains is the concrete mutual constraint of inside concrete, produces spontaneous stress; External constraint is from the constraint on old concrete or basis, produces restraint stress.Spontaneous stress and restraint stress are all the temperature stresses being produced by alternating temperature.Mass concrete temperature stress often exceedes the stress that external load causes and causes structure generation thermal cracking.The generation of thermal cracking not only has influence on bearing capacity and the design effect of structure, and, and security and permanance to structure also has material impact.Mass concrete can cause the excessive crack that produces of internal-external temperature difference because hydration heat discharges in the construction stage, and hydration heat excess Temperature, also can cause the significantly sacrificing of late strength of concrete.There are many large volume concrete structural things to occur the example in crack both at home and abroad, have a strong impact on the use of engineering, so that have to adopt remedial measures, waste time and energy, costly.Concrete expands along with the variation of temperature or shrinks, and becomes temperature deformation.For Mass Concrete Construction, crack, because temperature deformation causes, can become incipient crack or early crack.The crack occurring in mass concrete, generally can be divided into three kinds of surface crack, deep layer crack, through cracks etc. by its degree of depth.Through crack has cut off structure section, may destroy structural integrity, permanance and water proofing property, and impact is normally used, and harm is serious.Deep layer crack part has been cut off structure section, also has certain harmfulness.Although surface crack does not belong to structural crack, in the time of concrete shrinkage, because surface crack place section slackens and easily produces concentrated stress, crack is further developed.At present Crack Monitoring means only limit to the crack that surface produces, and the yardstick in crack is during greatly to certain scope, just effectively.Crack progressing process for inner concrete under thermograde effect, there is no proven technique means.
Summary of the invention
The object of this invention is to provide a kind of mass concrete temperature gradient Crack Monitoring method.For realizing, the mass concrete concrete cracking process that temperature development and change cause after building is monitored, temperature sensor is imbedded in the present invention's employing and thermograde and the thermal cracking of calibrate AE sensor to mass concrete monitored; Temperature sensor is connected with digital temperature recording unit, and calibrate AE sensor is connected with acoustic emission monitor(ing) equipment; Temperature sensor is for monitor temperature gradient, and calibrate AE sensor is for monitoring cracking and the location, crack of mass concrete.Said temperature sensor is take thermocouple as temperature sensor.Before concreting, structure reinforcing bars frame vertical good after, temperature sensor and calibrate AE sensor are pasted on respectively to the side of structure reinforcing bars with resin, temperature sensor does water-proofing treatment with the surperficial coated with resins of calibrate AE sensor.Wherein temperature is monitored with digital temperature recording unit, and acoustic emission monitor(ing) equipment for acoustic emission signal (the PCI-2 equipment of physical acoustics company of the U.S.) records, analyzes.Said temperature sensor and calibrate AE sensor arrange at the interval, side of structure reinforcing bars respectively; Concrete observation process is as follows: by place to temperature sensor and calibrate AE sensor, after concreting, start monitoring; Temperature record per hour once, monitor continuously by acoustic emission signal.After monitoring, the signal of beaming back according to temperature sensor and calibrate AE sensor, carries out data partition.Through monitoring, the time period that thermal cracking mainly forms in thermograde is the main time period that crack forms, and the position of mass concrete centre position and temperature variation maximum is mainly concentrated in crack.
The present invention has realized mass concrete temperature development and change and concrete cracking process of causing after building has been monitored, accurate and effective.
Accompanying drawing explanation
Fig. 1 is that monitoring device of the present invention arranges structural representation;
Fig. 2 is temperature evolution schematic diagram;
The position in Fig. 3 crack and with the schematic diagram that is related to of time.
In figure, 1, mass concrete, 2, structure reinforcing bars, 3, temperature sensor, 4, calibrate AE sensor, 5, digital temperature recording unit, 6, acoustic emission monitor(ing) equipment.
Embodiment
With reference to accompanying drawing, the present invention's employing is imbedded temperature sensor 3 and is monitored with thermograde and the thermal cracking of calibrate AE sensor 4 to mass concrete 1; Temperature sensor 3 is connected with digital temperature recording unit 5, and calibrate AE sensor 4 is connected with acoustic emission monitor(ing) equipment 6; Temperature sensor 3 is for monitor temperature gradient, and calibrate AE sensor 4 is for monitoring cracking and the location, crack of mass concrete.Said temperature sensor 3 is take thermocouple as temperature sensor.Before concreting, 2 of structure reinforcing bars vertical good after, temperature sensor 3 and calibrate AE sensor 4 use resins are pasted on respectively to the side of structure reinforcing bars 2, temperature sensor 3 does water-proofing treatment with the surperficial coated with resins of calibrate AE sensor 4.Wherein temperature is monitored with digital temperature recording unit 5, the PCI-2 equipment of physical acoustics company of the acoustic emission monitor(ing) equipment 6(U.S. for acoustic emission signal) record, analyze.Said temperature sensor 3 and calibrate AE sensor 4 arrange multiple at the interval, side of structure reinforcing bars 2 respectively; Temperature sensor 3 interval 0.1-1m arrange one; Be preferably temperature sensor 3 interval 0.2m and arrange one, calibrate AE sensor 4 interval 1-2m arrange one.
Concrete observation process is as follows: by place to temperature sensor 3 and calibrate AE sensor 4, after casting of concrete in mass, start monitoring; Temperature record per hour once, monitor continuously by acoustic emission signal.After monitoring, the signal of beaming back according to temperature sensor 3 and calibrate AE sensor 4, carries out data partition.Through monitoring, the time period that thermal cracking mainly forms in thermograde is the main time period that crack forms, and the position of mass concrete centre position and temperature variation maximum is mainly concentrated in crack.
Claims (5)
1. a mass concrete temperature gradient Crack Monitoring method, is characterized in that: employing is imbedded temperature sensor (3) and with calibrate AE sensor (4), thermograde and the thermal cracking of mass concrete (1) monitored; Temperature sensor (3) is connected with digital temperature recording unit (5), and calibrate AE sensor (4) is connected with acoustic emission monitor(ing) equipment (6); Temperature sensor (3) is for monitor temperature gradient, and calibrate AE sensor (4) is for monitoring cracking and the location, crack of mass concrete; Before concreting, after structure reinforcing bars (2) frame stands well, temperature sensor (3) and calibrate AE sensor (4) are pasted on respectively to the side of structure reinforcing bars (2) with resin, temperature sensor (3) does water-proofing treatment with the surperficial coated with resins of calibrate AE sensor (4), wherein for temperature, digital temperature recording unit (5) is monitored, and acoustic emission monitor(ing) equipment for acoustic emission signal (6) records, analyzes.
2. according to the said mass concrete temperature gradient of claim 1 Crack Monitoring method, it is characterized in that: said temperature sensor (3) is take thermocouple as temperature sensor.
3. according to the said mass concrete temperature gradient of claim 1 Crack Monitoring method, it is characterized in that: said temperature sensor (3) and calibrate AE sensor (4) arrange multiple at the interval, side of structure reinforcing bars (2) respectively.
4. according to the said mass concrete temperature gradient of claim 2 Crack Monitoring method, it is characterized in that: temperature sensor (3) interval 0.1-1m arranges one; Calibrate AE sensor (4) interval 1-2m arranges one.
5. according to the said mass concrete temperature gradient of claim 3 Crack Monitoring method, it is characterized in that: temperature sensor (3) interval 0.2m arranges one.
Priority Applications (1)
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| CN201310002072.5A CN103913514A (en) | 2013-01-05 | 2013-01-05 | Method for monitoring temperature and gradient cracks of large-volume concrete |
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| CN201310002072.5A CN103913514A (en) | 2013-01-05 | 2013-01-05 | Method for monitoring temperature and gradient cracks of large-volume concrete |
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Cited By (8)
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| CN104264675A (en) * | 2014-09-25 | 2015-01-07 | 沈建东 | Method for controlling mass concrete quality of high-rise building foundation |
| CN105527311A (en) * | 2016-01-12 | 2016-04-27 | 中国水利水电科学研究院 | Mass concrete microscopic fracture testing system |
| CN106353007A (en) * | 2016-08-29 | 2017-01-25 | 长安大学 | Precise testing device for temperature gradients of concrete structure and testing method of precise testing device |
| CN106706758A (en) * | 2017-03-14 | 2017-05-24 | 中交武汉港湾工程设计研究院有限公司 | Concrete structure cracking monitoring system and cracking monitoring method thereof |
| CN107843358A (en) * | 2017-12-04 | 2018-03-27 | 中国电建集团中南勘测设计研究院有限公司 | A kind of concrete abrasion early warning system and method |
| CN111322116A (en) * | 2020-04-07 | 2020-06-23 | 北京科技大学 | Method and device for monitoring mining surrounding rock ground pressure disaster in real time |
| CN113607824A (en) * | 2021-08-16 | 2021-11-05 | 赵跃 | Method for monitoring cracks in concrete beam plate pouring process |
| CN113932934A (en) * | 2021-08-30 | 2022-01-14 | 中铁七局集团有限公司 | Temperature control system of large-volume concrete temperature measuring line |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264675A (en) * | 2014-09-25 | 2015-01-07 | 沈建东 | Method for controlling mass concrete quality of high-rise building foundation |
| CN105527311A (en) * | 2016-01-12 | 2016-04-27 | 中国水利水电科学研究院 | Mass concrete microscopic fracture testing system |
| CN106353007A (en) * | 2016-08-29 | 2017-01-25 | 长安大学 | Precise testing device for temperature gradients of concrete structure and testing method of precise testing device |
| CN106706758A (en) * | 2017-03-14 | 2017-05-24 | 中交武汉港湾工程设计研究院有限公司 | Concrete structure cracking monitoring system and cracking monitoring method thereof |
| CN107843358A (en) * | 2017-12-04 | 2018-03-27 | 中国电建集团中南勘测设计研究院有限公司 | A kind of concrete abrasion early warning system and method |
| CN111322116A (en) * | 2020-04-07 | 2020-06-23 | 北京科技大学 | Method and device for monitoring mining surrounding rock ground pressure disaster in real time |
| CN111322116B (en) * | 2020-04-07 | 2020-12-15 | 北京科技大学 | Method and device for monitoring mining surrounding rock ground pressure disaster in real time |
| CN113607824A (en) * | 2021-08-16 | 2021-11-05 | 赵跃 | Method for monitoring cracks in concrete beam plate pouring process |
| CN113932934A (en) * | 2021-08-30 | 2022-01-14 | 中铁七局集团有限公司 | Temperature control system of large-volume concrete temperature measuring line |
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Application publication date: 20140709 |