CN105669246B - A kind of underground sidewall structure concrete thermal cracking Bracking-resistant method - Google Patents
A kind of underground sidewall structure concrete thermal cracking Bracking-resistant method Download PDFInfo
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- CN105669246B CN105669246B CN201610016058.4A CN201610016058A CN105669246B CN 105669246 B CN105669246 B CN 105669246B CN 201610016058 A CN201610016058 A CN 201610016058A CN 105669246 B CN105669246 B CN 105669246B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0075—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of a decrease in temperature
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
Abstract
The invention discloses a kind of underground sidewall structure concrete thermal cracking Bracking-resistant methods, for the problem that underground sidewall structure concrete under summer high temperature environment is easy to crack, by using the refrigeration machine in intelligence control system low-temperature airflow is passed through to the temperature control template of hollow structure, start to cool down after making concrete enter mould, that is, the molding temperature of concrete is greatly reduced, simultaneously, intelligence control system is with measured stress value, the condition of capillary negative pressure value and wall central temperature value as control refrigeration machine working method, concrete is set to be approached always but no more than the ultimate tensile stress value of concrete from the actual stress value for being poured into form removal, realize effective temperature control of lower side wall concrete over the ground, avoid the appearance of thermal cracking.
Description
Technical field
The present invention relates to technical field of concrete construction, Concrete Crack Control technical fields, and in particular to a kind of underground
Sidewall structure concrete thermal cracking Bracking-resistant method.
Background technology
Underground sidewall structure concrete, such as Underground Rail Transit side wall, architectural engineering ground lower side wall etc., problem of Cracking
It has been that one of concrete works field is extremely difficult to solve the problems, such as and overcome, cracking mode is mainly shown as that temperature is opened
It splits, especially in the environment of summer high temperature, concrete molding temperature is difficult to lower, and concrete hydrating Wen Sheng higher is often led
Cause serious thermal cracking.
The method for reducing underground side wall temperature crack at present mainly has additive method and Physical temperature-lowering method, additive method main
It is to use heat of hydration controlled material and swelling agent, the quantity of concrete thermal cracking generation can be alleviated to a certain extent,
But the crack that preferably solve or reduce concrete, generally requires to combine Physical temperature-lowering method and additive method, but existing
There is in technology Physical temperature-lowering method be difficult to achieve the effect that ideal, especially in the summer high temperature time, is dropped using common aggregate
Mild mode on the rocks, the molding temperature of concrete are also difficult to control at 28 DEG C hereinafter, technique effect unobvious.It is existing disclosed
In technology, there is the method for many prevention distress in concretes, application No. is the patents of CN201210528669.9 to disclose a kind of base
The wall maintenance process of temperature stress is reduced in automatic temperature measurement, which is temperature in temperature sensor test concrete, then
It is carried out by the way of to template water drenching to concrete Physical temperature-lowering, when wall inner concrete reaches warm peak, stops spray,
Then heat and moisture preserving is carried out to concrete using the form of covering film, in case wall rate of temperature fall is too fast and structure is caused to be opened
It splits, which only takes the physical cooling method of water drenching in the coagulation soil temperature liter stage, it is difficult to the cooling to the concrete temperature drop stage
The method for being accurately controlled, and using water drenching, it is undesirable to the cooling degree of coagulation, and be difficult to ensure in temperature-fall period
In, whether the stress development of concrete is reasonably controlled, it is difficult to reach preferable technique effect；Application No. is
201410244458.1 patent discloses a kind of long wall construction concrete curing device and its maintenance process, and the patent is using logical
It crosses and the guarantor that the moisturizing device that small water drenches slowly adds outer covering plastic film and thermal insulation material is set outside long wall concrete structural surface
Warm device controls the table temperature difference in concrete, reduces the temperature stress in concrete, main to reduce the thermal cracking of concrete
It is used to solve the crack problem of the long wall construction under the dry and big environment of day and night temperature, the technical method of the patent is adopted
With GB50496《Mass concrete construction specification》Temperature Con trolling index, the temperature of concrete can be controlled play it is certain
Effect, but the thickness of wall body of long wall construction is mainly 40cm~120cm, and mass concrete is not achieved in most of long wall construction
The range of definition, but thermal cracking is fairly common, and especially in summer high temperature, thermal cracking is extremely serious, therefore《Large volume
Concrete construction specification》In temperature index be not particularly suited for long wall construction concrete, be particularly unsuitable for summer high temperature environment
The thermal cracking problem of lower underground side wall concrete；Application No. is the patents of 201510322945.X to disclose outside a kind of basement
The maintenance process of wall, the patent are to carry out temperature control to concrete surface layer using after band mould spray and form removal, make concrete surface layer shape
At a kind of concrete thermostat layer, during concrete cooling, the contraction of thermostat layer inner concrete makes concrete thermostat layer generate
Compression, to avoid generating thermal cracking during concrete temperature drop, but there is design and theoretic defect in this method：It is mixed
Solidifying soil thermal cracking be due to surface temperature of concrete decline it is too fast or in table excessive temperature differentials lead to the tensile stress of Surface layer's concrete
The cracking generated more than the ultimate tensile stress of concrete, the patent have taken into consideration only concrete of concrete during temperature drop
Surface layer's concrete is set as thermostat layer by the problem of temperature stress during Wen Sheng, when the Wen Sheng higher of inner concrete,
Inner concrete generates expansion, causes Surface layer's concrete to generate compared with tensile stress, therefore during coagulation soil temperature rises, that is, is possible to
Lead to the appearance of more serious thermal cracking.
Above-described art methods and many relevant temperature crack control technologies are difficult to preferably solve
The thermal cracking problem of underground sidewall structure concrete when summer high temperature environment, it is therefore necessary to invent one kind can be greatly reduced it is mixed
The technical method of solidifying soil molding temperature and hydration temperature, fundamentally solves the problems, such as the thermal cracking of concrete.
Invention content
For underground sidewall structure concrete, it is difficult to decrease, mixes to solve concrete molding temperature under summer high temperature environment
Solidifying soil temperature rises concrete thermal cracking problem caused by the factors such as higher, and the invention discloses a kind of underground sidewall structure concrete
Thermal cracking Bracking-resistant method, is specifically realized in：
A kind of underground sidewall structure concrete thermal cracking Bracking-resistant method, includes the following steps：
(1) before construction, concrete is gone out by stress test testing and drawing and develops song with the ultimate tensile stress that age changes
Line, and get equipment and accessory ready：Temperature control template, intelligence control system, refrigeration machine, stress meter, temperature sensor, capillary negative pressure
Sensor；
The temperature control template includes steel plate structure and adiabator plate, and steel plate structure is concrete surface, steel plate structure
Form hollow structure with adiabator plate, the four corners of adiabator plate are respectively provided with a ventilation interface, ventilation interface with it is described
Hollow structure is connected, and the ventilation interface of adjacent temperature control template can make the hollow structure of adjacent temperature control template by taking over connection
Connection；
The intelligence control system is freezed using measured stress value, capillary negative pressure value and wall central temperature value as control
The condition of machine working method, refrigeration mechanism are made cooling air-flow and are passed through in temperature control template from ventilation interface；
The intelligence control system further includes data transmission blocks, and data transmission blocks can be by temperature, stress and capillary
The numerical value of negative pressure monitoring sends the control program of intelligence control system to by the form of wireless transmission；
Intelligence control system includes two temperature control stages：First temperature control stage：Refrigeration machine constant temperature freezes, by 5 DEG C of air-flow
It is passed through in temperature control template；Second temperature control stage：Refrigeration machine alternating temperature freezes, by adjusting the gas flow temperature being passed through in temperature control template,
It is the 80%~90% of concrete ultimate tensile stress value to make stress meter measured stress value；
(2) according to sequence of construction, first the reinforcing bar of sidewall structure is tied, then use temperature control template molding, using take over by
The hollow structure of the temperature control template of entire sidewall structure is together in series, and one end ventilation for the hollow structure long-chain being together in series is connect
Mouth is connect with the air shooter of refrigeration machine, and the other end is as gas outlet, when the low-temperature airflow of refrigeration machine manufacture is conveyed from gas
When pipe is passed through temperature control template, the temperature control template of whole face side wall is cooled down by low-temperature airflow, and temperature control die plate temperature reduces, and plays
The effect of cooling refrigeration；
Stress meter is embedded in advance in the middle part of wall away from temperature control template 1cm~3cm, in order to monitor concrete surface layer
Stress value, temperature sensor is embedded in the centre of wall, monitors the changing value of concrete internal temperature, to judge
Concrete heats up and the process of cooling；
(3) concrete starts before pouring, and starts intelligent temperature control system, executes for the first temperature control stage, at this point, temperature control mould
The rapid drop in temperature of plate, in concreting, the temperature of the temperature control template contacts of concrete and cooling, concrete declines,
Being equivalent to reduces the molding temperature of concrete；
In order to effectively reduce the temperature before concrete hardening, the presetting period for controlling concrete is not less than 20 hours, in this way,
In the lasting temperature-fall period of temperature control template, the temperature of fresh concrete is gradually reduced, the effect be equal to substantially reduce it is mixed
The molding temperature for coagulating soil, good technical guarantee is provided for the anticracking of underground side wall concrete；
(4) using the capillary negative pressure of capillary negative pressure sensor (15) test concrete after pouring, to avoid mixing
Solidifying soil surface moisture evaporation and the influence of bleeding, the test depth of capillary negative pressure should be concrete upper surface or less 10~
20cm, according to the rule of development of concrete capillary negative pressure, when capillary negative pressure value reaches 50kPa, concrete has been approached end
Solidifying state, at this point, the micro-crack of inside concrete is just difficult to restore, therefore, set in next step intelligence control system automatically into
The temperature controlling mode in the second temperature control stage, it is ensured that the stress of concrete is no more than its ultimate tensile stress value, avoids generating cracking phenomena；
(5) when the temperature at wall center reaches warm peak value and gradually decreases down temperature TCenter, and with work as daily mean temperature
TTemperature on averageMeet relational expression TCenter≤TTemperature on averageWhen+10, intelligence control system closes refrigeration machine, at this time underground sidewall structure concrete
Reach form removal condition.
In step (1), it is contemplated that for concrete when less than 0 DEG C, moisture crystallization causes concrete microstructure to be damaged
Evil, the gas flow temperature for setting the second temperature control stage are not less than 5 DEG C, if when gas flow temperature is 5 DEG C, stress meter measured stress
Value is less than the 80% of concrete ultimate tensile stress, then airflow temperature-control is 5 DEG C by refrigeration machine.
The ventilation interface being not used is sealed using sealing-plug in step (2).
Insulated curing need not be carried out again, just thermal cracking there will be no to generate, should be sprayed at this time in step (5) after form removal
Curing agent is smeared in water curing, to avoid concrete cracking caused by dry shrink.
Beneficial effects of the present invention：The temperature control technique of the present invention can make concrete from pour just cool down, mixing
The temperature of concrete is greatly reduced before solidifying soil initial set, that is, the molding temperature of concrete is greatly reduced, this is the prior art
It cannot achieve；The present invention is more than limiting pressure and causes to crack according to the basic reason of concrete cracking, i.e. tensile stress, with real-time
The stress value of monitoring is guidance, carries out concrete temperature intelligent control, efficiently avoids the generation of concrete thermal cracking；This
The technological means of invention is to carry out continuing temperature control when concrete heats up and cools down, and can be effectively reduced the aquation temperature of concrete
It rises, shortens the time of the thermal history of coagulation soil temperature liter and temperature drop, can largely improve concrete in Wen Sheng and temperature
The volume stability of structure during drop；Under summer high temperature environment, without taking relatively complicated but little effect coagulation again
Native molding temperature control method, concrete temperature has been approached environment temperature or low compared with environment temperature after form removal, without being protected again
Temperature maintenance.
Description of the drawings
Fig. 1 is intelligence control system temperature controlling mode schematic diagram.
Fig. 2 is temperature control formwork sides structural schematic diagram.
Fig. 3 is the splicing construction schematic diagram of two pieces of temperature control templates.
Fig. 4 is that underground sidewall structure buries stress meter and template assembling schematic diagram.
Fig. 5 is the embedded schematic diagram of capillary negative pressure transducer probe assembly.
The specific of Fig. 1~Fig. 5 is labeled as：1 intelligence control system, 2 refrigeration machines, 3 air shooters, 4 air stream transportation directions,
5 ventilation interfaces, 6 sealing-plugs, 7 data transmission blocks, 8 temperature control templates, 9 steel plate structures, 10 adiabator plates, 11 take over, 12 answer
Power meter, 13 temperature sensors, 14 concrete, 15 capillary negative pressure sensors, 16 hollow structures.
Specific implementation mode
To solve the problems, such as that the thermal cracking of sidewall structure concrete in underground in summer high temperature environment, the present invention are newly mixed to reduce
Concrete condensation harden before temperature and with measured stress be according to persistently to concrete implement temperature control etc. technologies hand
Section, provides a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method：
Before construction, concrete is gone out by stress test testing and drawing first and develops song with the ultimate tensile stress that age changes
Line, and get equipment and accessory ready：Temperature control template 8, intelligence control system 1, refrigeration machine 2, stress meter 12, temperature sensor 13, hair
Tubule B/P EGR Back Pressure Transducer EGR 15；
The temperature control template 8 includes steel plate structure 9 and adiabator plate 10, and steel plate structure 9 is concrete surface, steel plate
Structure 9 forms hollow structure 16 with adiabator plate 10, and the four corners of adiabator plate 10 are respectively provided with a ventilation interface 5, lead to
Gas interface 5 is connected with the hollow structure 16, and the ventilation interface 5 of adjacent temperature control template 8 can be made adjacent by 11 connection of take over
The hollow structure 16 of temperature control template 8 is connected to；
The intelligence control system 1 is made using measured stress value, capillary negative pressure value and wall central temperature value as control
The condition of 2 working method of cold, refrigeration machine 2 manufacture cooling air-flow and are passed through in temperature control template 8 from ventilation interface 5；
The intelligence control system further includes data transmission blocks 7, and data transmission blocks 7 can be by temperature, stress and capillary
The numerical value of pipe negative pressure monitoring sends the control program of intelligence control system 1 to by the form of wireless transmission；
Intelligence control system 1 includes two temperature control stages：First temperature control stage：2 constant temperature of refrigeration machine freezes, by 5 DEG C of gas
In the temperature control template 8 that circulates；Second temperature control stage：2 alternating temperature of refrigeration machine freezes, by adjusting the air-flow being passed through in temperature control template 8
Temperature, it is the 80%~90% of concrete ultimate tensile stress value to make stress meter measured stress value；
In view of concrete 14 is when less than 0 DEG C, moisture crystallization causes 14 microstructure of concrete to be damaged, sets
The gas flow temperature in the second temperature control stage is not less than 5 DEG C, if when gas flow temperature is 5 DEG C, 12 measured stress value of stress meter is small
In the 80% of concrete ultimate tensile stress, then airflow temperature-control is 5 DEG C by refrigeration machine 2；
According to sequence of construction, first the reinforcing bar of sidewall structure is tied, then uses 8 molding of temperature control template, it will using take over 11
The hollow structure 16 of the temperature control template 8 of entire sidewall structure is together in series, and the one end for the hollow structure long-chain being together in series is led to
Gas interface 5 is connect with the air shooter 3 of refrigeration machine, and the other end utilizes the ventilation interface 5 being not used close as gas outlet
Blocking 6 seals, when the low-temperature airflow that refrigeration machine 2 manufactures is passed through from air shooter 3 in temperature control template 8, the control of whole face side wall
Warm template 8 is cooled down by low-temperature airflow, and 8 temperature of temperature control template reduces, and plays the role of cooling refrigeration；
Stress meter 12 is embedded at 1cm~3cm away from temperature control template 8 in advance, in order to monitor 14 surface layer of concrete
Temperature sensor 13 is embedded in the centre of wall by stress value, the changing value of 14 internal temperature of concrete is monitored, to sentence
The process of disconnected concrete heating and cooling；
Concrete starts before pouring, and starts intelligent temperature control system 1, executes for the first temperature control stage, at this point, temperature control template
8 rapid drop in temperature, in concreting, concrete 14 is contacted with the temperature control template 8 of cooling, at a temperature of concrete
Drop, is equivalent to the molding temperature for reducing concrete 14；
In order to be effectively reduced 14 presclerotic temperature of concrete, the presetting period of control concrete 14 is small not less than 20
When, in this way, in the lasting temperature-fall period of temperature control template 8, the temperature of fresh concrete 14 is gradually reduced, which is equal to
The molding temperature for substantially reducing concrete 14 provides good technical guarantee for the anticracking of underground side wall concrete；
The capillary negative pressure for testing concrete 14 after pouring using capillary negative pressure sensor 15, to avoid concrete
14 surface moistures evaporate and the influence of bleeding, the depth of burying of the gauge head of capillary negative pressure sensor 15 should be on concrete 14
10~20cm below surface, when capillary negative pressure value reaches 50kPa, is mixed according to the rule of development of concrete capillary negative pressure
Solidifying soil has been approached final set state, at this point, the micro-crack of inside concrete is just difficult to restore, therefore, sets intelligent control in next step
Temperature controlling mode of the system 1 automatically into the second temperature control stage, it is ensured that the stress of concrete 14 is no more than its ultimate tensile stress value, keeps away
Exempt to generate cracking phenomena；
When the temperature at wall center reaches warm peak value and gradually decreases down temperature TCenter, and with as daily mean temperature TTemperature on averageIt is full
Sufficient relational expression TCenter≤TTemperature on averageWhen+10, intelligence control system 1 closes refrigeration machine 2, and sidewall structure concrete in underground, which reaches, at this time tears open
Mould condition need not carry out insulated curing again after form removal, just thermal cracking there will be no to generate, should carry out wet curing or painting at this time
Curing agent is smeared, to avoid concrete cracking caused by dry shrink.
Embodiment
Wall construction on the downside of somewhere, thickness 80cm, height 6m, it is 20m that single, which pours length, and 34.2 DEG C of environment temperature uses
C40 concrete pouring constructions, then when not carrying out molding temperature control to concrete, the molding temperature of concrete is 36.4 DEG C, just
The solidifying time is 10h, and aquation temperature is upgraded to 33.5 DEG C, and engineering effort shows：Side wall serious cracking, every 0.8~1.5 meter of temperature are split
Seam；Later, through the technological means such as supercooling raw material, on the rocks, the control of concrete molding temperature is in 31.5 DEG C, presetting period
10.5h, aquation temperature are upgraded to 33.2 DEG C, and engineering effort shows：Side wall serious cracking, every 1.0~1.6 meters of thermal crackings；Two
The technique effect of secondary construction shows that under summer high temperature environment, the engineering concrete only reduces the work of 5 DEG C or so of molding temperature
Cheng Xiaoguo unobvious, and initial molding temperature is only reduced, under the premise of not changing wall radiating condition, concrete hydrating Wen Sheng
It is substantially unaffected.
Technical method using the present invention, the first coagulation every 2~6h in laboratory test concrete in 7d
Native ultimate tensile stress, and the ultimate tensile stress curve of engineering construction C40 concrete is drawn out, using temperature control of the present invention
Template, and pouring construction is carried out according to technical method provided by the invention, when construction, environment temperature is 35.0 DEG C, measures coagulation
The molding temperature of soil is 36.8 DEG C, sets the concrete initial set time as 21h, and 5 DEG C of low-temperature airflows are passed through by refrigeration machine, after 21h,
Concrete central temperature is 15.1 DEG C, and the actual measurement concrete initial set time is 25h, and the temperature at concrete center is 14.2 DEG C at this time,
Concrete hydrating temperature is upgraded to 20.1 DEG C, is found after concrete form removal, using the engineering test phase of technical solution of the present invention without temperature
Crack generates, and engineering effort is good.
Claims (4)
1. a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method, which is characterized in that include the following steps：
(1) before construction, the ultimate tensile stress progress curve that concrete changes with age is gone out by stress test testing and drawing, and
Get equipment and accessory ready：Temperature control template (8), intelligence control system (1), refrigeration machine (2), stress meter (12), temperature sensor
(13), capillary negative pressure sensor (15)；
The temperature control template (8) includes steel plate structure (9) and adiabator plate (10), and steel plate structure (9) is contacted with concrete, steel
Harden structure (9) forms hollow structure (16) with adiabator plate (10), and the four corners of adiabator plate (10) are respectively provided with one and lead to
Gas interface (5), ventilation interface (5) are connected with the hollow structure (16), and the ventilation interface (5) of adjacent temperature control template (8) is logical
It crosses and takes over (11) connection, the hollow structure (16) of adjacent temperature control template (8) is made to be connected to；
The intelligence control system (1) is freezed using measured stress value, capillary negative pressure value and wall central temperature value as control
The condition of machine (2) working method, refrigeration machine (2) manufacture cooling air-flow are simultaneously passed through from ventilation interface (5) in temperature control template (8)；
The intelligence control system (1) further includes data transmission blocks (7), and data transmission blocks (7) can be by temperature, stress and hair
The numerical value of tubule negative pressure monitoring sends the control program of intelligence control system (1) to by the form of wireless transmission；
Intelligence control system (1) includes two temperature control stages：First temperature control stage：Refrigeration machine (2) constant temperature freezes, by 5 DEG C of gas
In the temperature control template that circulates (8)；Second temperature control stage：Refrigeration machine (2) alternating temperature freezes, by adjusting being passed through in temperature control template (8)
Gas flow temperature, make stress meter measured stress value be concrete ultimate tensile stress value 80%~90%；
(2) according to sequence of construction, first the reinforcing bar of sidewall structure is tied, then uses temperature control template (8) molding, using taking over (11)
The hollow structure of the temperature control template of entire sidewall structure is together in series, the one end for the hollow structure long-chain being together in series is ventilated
Interface (5) is connect with the air shooter of refrigeration machine (2), and the other end is as gas outlet, when the low-temperature airflow that refrigeration machine (2) manufactures
When being passed through temperature control template (8) from air shooter (3), the temperature control template of whole face side wall is cooled down by low-temperature airflow, temperature control
Die plate temperature reduces；
Stress meter (12) is embedded in advance in the middle part of wall away from temperature control template (8) 1cm~3cm, by temperature sensor (13)
It is embedded in the centre of wall；
(3) concrete starts before pouring, and starts intelligent temperature control system (1), executes for the first temperature control stage, at this point, temperature control mould
The rapid drop in temperature of plate (8), in concreting, concrete is contacted with the temperature control template (8) of cooling, the temperature of concrete
Decline, is equivalent to the molding temperature for reducing concrete；
The presetting period for controlling concrete is not less than 20 hours；
(4) capillary negative pressure of concrete is tested after pouring using capillary negative pressure sensor (15), capillary negative pressure
Test depth should be 10~20cm of concrete upper surface or less, when capillary negative pressure value reaches 50kPa, set intelligence in next step
Temperature controlling mode of the control system (1) automatically into the second temperature control stage；
(5) when the temperature at wall center reaches warm peak value and gradually decreases down temperature TCenter, and with as daily mean temperature TTemperature on averageIt is full
Sufficient relational expression TCenter≤TTemperature on averageWhen+10, intelligence control system (1) closes refrigeration machine (2), and sidewall structure concrete in underground reaches at this time
To form removal condition.
2. a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method according to claim 1, which is characterized in that step
Suddenly the gas flow temperature in setting the second temperature control stage is not less than 5 DEG C in (1), if when gas flow temperature is 5 DEG C, stress meter actual measurement
Stress value is less than the 80% of concrete ultimate tensile stress, then airflow temperature-control is 5 DEG C by refrigeration machine (2).
3. a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method according to claim 1, which is characterized in that step
Suddenly the ventilation interface (5) being not used is sealed using sealing-plug in (2).
4. a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method according to claim 1, which is characterized in that step
Suddenly wet curing should be carried out in (5) after concrete form removal or smears curing agent.
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| CN111441246A (en) * | 2019-01-16 | 2020-07-24 | 东南大学 | High-strength, large-volume and strong-constraint cable tower concrete crack control method |
| CN109680717B (en) * | 2019-01-30 | 2021-03-16 | 武汉市市政建设集团有限公司 | Anti-crack construction method for side wall structure of underground rail transit |
| CN112195979B (en) * | 2020-09-18 | 2022-03-18 | 中铁十四局集团第二工程有限公司 | Concrete anti-cracking waterproof construction method for underground side wall structure |
| CN112160443B (en) * | 2020-09-18 | 2022-03-18 | 青岛地铁集团有限公司 | Summer crack resistance construction method for underground side wall structure concrete |
| CN113624179A (en) * | 2021-07-21 | 2021-11-09 | 袁松 | Different thickness steel mesh mould concrete wall contrast detects uses crack control testing arrangement |
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| CN101762451A (en) * | 2009-12-30 | 2010-06-30 | 水利部交通运输部国家能源局南京水利科学研究院 | Concrete split test device being capable of controlling wind speed and humiture and climate sensitivity evaluation method |
| CN102221602A (en) * | 2010-04-15 | 2011-10-19 | 深圳泛华工程集团有限公司 | Tester for concrete free deformation |
| CN102852145B (en) * | 2012-08-14 | 2014-12-24 | 清华大学 | Method and system for intelligently controlling temperature of concretes of dam under construction |
| CN203145016U (en) * | 2013-03-22 | 2013-08-21 | 中国水电顾问集团贵阳勘测设计研究院 | Device for adjusting temperature difference between inside and outside of concrete |
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