CN105669246A - Underground side wall structure concrete temperature crack anticracking method - Google Patents
Underground side wall structure concrete temperature crack anticracking method Download PDFInfo
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- CN105669246A CN105669246A CN201610016058.4A CN201610016058A CN105669246A CN 105669246 A CN105669246 A CN 105669246A CN 201610016058 A CN201610016058 A CN 201610016058A CN 105669246 A CN105669246 A CN 105669246A
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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
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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
- 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
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
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Abstract
The invention discloses an underground side wall structure concrete temperature crack anticracking method. Directed at the problem of easy cracking of underground side wall structure concrete under a summer high temperature condition, low temperature airflow is introduced into a hollow structure temperature control template by a refrigerating machine of an intelligent control system, so that concrete starts to cool after entering a die, i.e. substantially lowering the concrete's temperature of entering the die. At the same time, the intelligent control system takes a measured stress value, a capillary negative pressure value and a wall center temperature value as the conditions for controlling the working mode of the refrigerating machine, so that the actual stress value of the concrete from pouring to die removal is always close to but not greater than an ultimate tensile stress value of concrete, thereby realizing effective temperature control of underground side wall concrete, and avoiding temperature cracks.
Description
Technical field
The present invention relates to technical field of concrete construction, Concrete Crack Control technical field, be specifically related 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., its problem of Cracking has been the problem being extremely difficult to solve and overcome in concrete works field, its cracking mode main manifestations is temperature cracking, especially under the environment of summer high temperature, concrete molding temperature is difficult to lower, and concrete hydrating temperature rise is higher, often leads to serious thermal cracking.
The method reducing side wall temperature crack, underground at present mainly has additive method and Physical temperature-lowering method, additive method mainly uses heat of hydration controlled material and extender, it can alleviate the quantity that concrete thermal cracking produces to a certain extent, but better to solve or to reduce concrete crack, generally require and Physical temperature-lowering method and additive method are combined, but Physical temperature-lowering method is difficult to reach ideal effect in prior art, especially in the summer high temperature time, adopt common aggregate cooling and mode on the rocks, concrete molding temperature is also difficult to control to below 28 DEG C, technique effect is inconspicuous. in existing disclosed technology, the method having many preventing and treating distress in concretes, to be the patent disclosure of CN201210528669.9 a kind of based on automatic temperature measurement reduces the body of wall maintenance process of temperature stress for application number, this patent is temperature in temperature sensor test concrete, then the mode to template trickle is adopted to carry out concrete Physical temperature-lowering, when its body of wall inner concrete reaches temperature peak, stop spray, then adopt the form of cover film that concrete is carried out heat and moisture preserving, in order to avoid body of wall rate of temperature fall is too fast and cause structure crack, this patent only takes the physical cooling method of trickle in the concrete temperature rise stage, it is difficult to the cooling in concrete temperature drop stage is accurately controlled, and the method adopting trickle, the cooling degree of coagulation is undesirable, and it is difficult to ensure that in temperature-fall period, whether concrete stress development is reasonably controlled, it is difficult to reach good technique effect, application number be the patent disclosure of 201410244458.1 a kind of long wall construction concrete curing device and maintenance process thereof, this patent adopts the moisturizing device drenched slowly by arranging little water outside long wall concrete structural surface to add the attemperator of outer covered with plastic film and insulation material, control the table temperature difference in concrete, reduce the temperature stress in concrete, thus reducing concrete thermal cracking, it is mainly used in solving the crack problem of the long wall construction under dry and that day and night temperature is big environment, the technical method of this patent have employed the temperature Con trolling index of GB50496 " mass concrete construction specification ", can control to play a role to concrete temperature, but the thickness of wall body of long wall construction is mainly 40cm～120cm, the long wall construction of major part does not reach the range of definition of mass concrete, but thermal cracking is all fairly common, especially when summer high temperature, thermal cracking is extremely serious, therefore the temperature index in " mass concrete construction specification " is not particularly suited for long wall construction concrete, the thermal cracking problem being particularly unsuitable under summer high temperature environment underground side wall concrete,The maintenance process of application number a kind of outer wall of basement that has been the patent disclosure of 201510322945.X, this patent is, after adopting band mould spray and form removal, concrete surface layer is carried out temperature control, concrete surface layer is made to form a kind of concrete thermostat layer, in concrete cooling process, thermostat layer inner concrete shrinks and makes concrete thermostat layer produce compressive stress, thus avoiding generation thermal cracking in concrete temperature drop process, but there is design and theoretic defect in the method: concrete thermal cracking be due to surface temperature of concrete decline too fast or in the table excessive temperature differentials cracking that causes the tension of Surface layer's concrete to produce more than concrete ultimate tensile stress, the problem that this patent has taken into consideration only concrete concrete temperature stress in temperature drop process, in temperature rise process, Surface layer's concrete is set as thermostat layer, when the temperature rise of inner concrete is higher, inner concrete produces to expand, cause that Surface layer's concrete produces relatively tension, therefore in concrete temperature rise process, namely the appearance of more serious thermal cracking it is likely to result in.
Above-described art methods and many relevant temperature crack control technology are all difficult to solve preferably underground sidewall structure concrete thermal cracking problem during summer high temperature environment, it is therefore desirable to invent a kind of technical method that concrete molding temperature and hydration temperature are greatly reduced, fundamentally solve concrete thermal cracking problem.
Summary of the invention
For underground sidewall structure concrete, for solving the concrete thermal cracking problem that concrete molding temperature under summer high temperature environment is difficult to reduce, the more high factor of concrete temperature rise causes, the invention discloses a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method, be specifically achieved in that
A kind of underground sidewall structure concrete thermal cracking Bracking-resistant method, comprises the steps:
(1) before construction, go out, by stress test testing and drawing, the ultimate tensile stress progress curve that concrete changed with age, and get equipment and accessory ready: temperature control template, intelligence control system, refrigeration machine, stressometer, temperature sensor, capillary negative pressure sensor;
Described temperature control template includes steel plate structure and adiabator plate, steel plate structure is concrete surface, steel plate structure forms hollow structure with adiabator plate, the corner place of adiabator plate is respectively provided with a ventilation interface, ventilation interface is connected with described hollow structure, the ventilation interface of adjacent temperature control template can pass through to take over to connect, and makes the hollow structure of adjacent temperature control template connect;
Described intelligence control system is using measured stress value, capillary negative pressure value and body of wall central temperature value as the condition controlling refrigeration machine working method, and refrigeration mechanism refrigeration but air-flow also passes into temperature control template from ventilation interface;
Described intelligence control system also includes data transmission blocks, and the numerical value of temperature, stress and capillary negative pressure monitoring can be sent to the control program of intelligence control system by data transmission blocks by the form of wireless transmission;
Intelligence control system includes two temperature control stages: the first temperature control stage: refrigeration machine constant temperature freezes, and is passed into by the air-flows of 5 DEG C in temperature control template; The second temperature control stage: refrigeration machine alternating temperature freezes, by adjusting the gas flow temperature passing in temperature control template, make stressometer 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, adopt temperature control template molding again, adapter is utilized to be together in series by the hollow structure of the temperature control template of whole sidewall structure, interface of being ventilated the one end of the hollow structure long-chain being together in series is connected with the air shooter of refrigeration machine, the other end is as gas outlet, when the low-temperature airflow of refrigeration machine manufacture passes into temperature control template from air shooter, the temperature control template of whole side wall is all subject to the cooling of low-temperature airflow, temperature control die plate temperature reduces, and plays the effect of cooling refrigeration;
In advance stressometer is embedded in from temperature control template 1cm～3cm place in the middle part of body of wall, so that the stress value of monitoring concrete surface layer, temperature sensor is embedded in the centre of body of wall, the changing value of monitoring concrete internal temperature, in order to judge the process that concrete heats up and lowers the temperature;
(3) before concrete starts to build, start intelligent temperature control system, performed for the first temperature control stage, now, the rapid drop in temperature of temperature control template, when concreting, the temperature control template contacts of concrete and cooling, concrete temperature declines, and is equivalent to reduce concrete molding temperature;
In order to effectively reduce the temperature before concrete hardening, controlling the concrete presetting period is not less than 20 hours, so, in the temperature-fall period that temperature control template is lasting, the temperature of fresh concrete is gradually reduced, this effect is equal to and is substantially reduced concrete molding temperature, provides good technical guarantee for the anticracking of underground side wall concrete;
(4) capillary negative pressure sensor (15) is utilized to test concrete capillary negative pressure after building, for avoiding the impact of the evaporation of concrete surface moisture and bleeding, the MTD of capillary negative pressure should be below concrete upper surface 10～20cm, law of development according to concrete capillary negative pressure, when capillary negative pressure value reaches 50kPa, concrete is close to final set state, now, the micro-crack dyschezia of inside concrete is to recover, therefore, next step sets the intelligence control system temperature controlling mode automatically into the second temperature control stage, guarantee that concrete stress is less than its ultimate tensile stress value, avoid producing cracking phenomena,
(5) when the temperature at body of wall center reaches temperature peak value and gradually decreases down temperature TCenter, and with as daily mean temperature TTemperature on averageMeet relational expression TCenter≤TTemperature on averageWhen+10, intelligence control system closes refrigeration machine, and now sidewall structure concrete in underground reaches form removal condition.
In step (1), consider that concrete is when lower than 0 DEG C, moisture crystallization, cause that concrete microstructure suffers damage, the gas flow temperature setting the described second temperature control stage is not less than 5 DEG C, if when gas flow temperature is 5 DEG C, stressometer 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 not used is utilized sealing-plug to seal by step (2).
Step (5) need not carry out after form removal insulated curing again, just there will be no thermal cracking to produce, now should carry out wet curing or smear sealing compound, the concrete cracking caused to avoid dry shrinkage.
Beneficial effects of the present invention: the temperature control technique of the present invention can make concrete just start cooling from building beginning, concrete temperature is greatly reduced, is namely equivalent to concrete molding temperature is greatly reduced before concrete initial set, and this is that prior art cannot realize; The present invention basic reason according to concrete cracking, namely tension causes cracking more than limiting pressure, with the stress value monitored in real time for instructing, carries out concrete temperature Based Intelligent Control, efficiently avoid the generation of concrete thermal cracking; The technological means of the present invention is to carry out lasting temperature control when concrete heats up and lowers the temperature, concrete aquation temperature rise can be effectively reduced, shorten the time of the thermal history of concrete temperature rise and temperature drop, concrete volume stability of structure in temperature rise and temperature drop process can be improved largely; Under summer high temperature environment, need not taking relatively complicated but that effect is little concrete molding temperature control method again, after form removal, concrete temperature is close to ambient temperature or relatively ambient temperature is low, need not carry out insulated curing again.
Accompanying drawing explanation
Fig. 1 is intelligence control system temperature controlling mode schematic diagram.
Fig. 2 is temperature control formwork sides structural representation.
Fig. 3 is the splicing construction schematic diagram of two pieces of temperature control templates.
Fig. 4 is that underground sidewall structure buries stressometer and template assembling schematic diagram underground.
Fig. 5 be capillary negative pressure transducer probe assembly bury schematic diagram underground.
Fig. 1～Fig. 5 is specifically labeled as: 1 intelligence control system, 2 refrigeration machines, 3 air shooters, 4 air stream transportation directions, 5 ventilation interface, 6 sealing-plugs, 7 data transmission blocks, 8 temperature control templates, 9 steel plate structures, 10 adiabator plates, 11 adapters, 12 stressometers, 13 temperature sensors, 14 concrete, 15 capillary negative pressure sensors, 16 hollow structures.
Detailed description of the invention
For solving sidewall structure concrete thermal cracking problem in underground in summer high temperature environment, the present invention is to reduce fresh concrete in the temperature condensed before hardening with measured stress for according to concrete is persistently implemented the technological means such as temperature control, it is provided that a kind of underground sidewall structure concrete thermal cracking Bracking-resistant method:
Before construction, first pass through stress test testing and drawing and go out the ultimate tensile stress progress curve that concrete changed with age, and get equipment and accessory ready: temperature control template 8, intelligence control system 1, refrigeration machine 2, stressometer 12, temperature sensor 13, capillary negative pressure sensor 15;
Described temperature control template 8 includes steel plate structure 9 and adiabator plate 10, steel plate structure 9 is concrete surface, steel plate structure 9 and adiabator plate 10 form hollow structure 16, the corner place of adiabator plate 10 is respectively provided with a ventilation interface 5, ventilation interface 5 is connected with described hollow structure 16, the ventilation interface 5 of adjacent temperature control template 8 can pass through adapter 11 and connect, and makes the hollow structure 16 of adjacent temperature control template 8 connect;
Described intelligence control system 1 is using measured stress value, capillary negative pressure value and body of wall central temperature value as the condition controlling refrigeration machine 2 working method, and refrigeration machine 2 manufactures cooling air-flow and passes into temperature control template 8 from ventilation interface 5;
Described intelligence control system also includes data transmission blocks 7, and the numerical value of temperature, stress and capillary negative pressure monitoring can be sent to the control program of intelligence control system 1 by data transmission blocks 7 by the form of wireless transmission;
Intelligence control system 1 includes two temperature control stages: the first temperature control stage: refrigeration machine 2 constant temperature freezes, and is passed into by the air-flows of 5 DEG C in temperature control template 8; The second temperature control stage: refrigeration machine 2 alternating temperature freezes, by adjusting the gas flow temperature passing in temperature control template 8, make stressometer measured stress value be concrete ultimate tensile stress value 80%～90%;
Consider that concrete 14 is when lower than 0 DEG C, moisture crystallization, cause that concrete 14 microstructure suffers damage, the gas flow temperature setting the described second temperature control stage is not less than 5 DEG C, if when gas flow temperature is 5 DEG C, stressometer 12 measured stress value is less than 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, adopt temperature control template 8 molding again, adapter 11 is utilized to be together in series by the hollow structure 16 of the temperature control template 8 of whole sidewall structure, interface 5 of being ventilated the one end of the hollow structure long-chain being together in series is connected with the air shooter 3 of refrigeration machine, the other end is as gas outlet, sealing-plug 6 is utilized to seal the ventilation interface 5 not used, when the low-temperature airflow that refrigeration machine 2 manufactures passes into temperature control template 8 from air shooter 3, the temperature control template 8 of whole side wall is all subject to the cooling of low-temperature airflow, temperature control template 8 temperature reduces, play the effect of cooling refrigeration,
In advance stressometer 12 is embedded in the 1cm～3cm place from temperature control template 8, so that the stress value on monitoring concrete 14 top layer, temperature sensor 13 is embedded in the centre of body of wall, the changing value of monitoring concrete 14 internal temperature, in order to judge the process that concrete heats up and lowers the temperature;
Before concrete starts to build, start intelligent temperature control system 1, performed for the first temperature control stage, now, the rapid drop in temperature of temperature control template 8, when concreting, concrete 14 contacts with the temperature control template 8 of cooling, and concrete temperature declines, and is equivalent to reduce the molding temperature of concrete 14;
In order to be effectively reduced the presclerotic temperature of concrete 14, the presetting period controlling concrete 14 is not less than 20 hours, so, in the temperature-fall period that temperature control template 8 is lasting, the temperature of fresh concrete 14 is gradually reduced, this effect is equal to the molding temperature being substantially reduced concrete 14, for the technical guarantee that the anticracking offer of underground side wall concrete is good;
Capillary negative pressure sensor 15 is adopted to test the capillary negative pressure of concrete 14 after building, for avoiding the impact of the evaporation of concrete 14 surface moisture and bleeding, the depth of burying of the gauge head of capillary negative pressure sensor 15 should be below concrete 14 upper surface 10～20cm, law of development according to concrete capillary negative pressure, when capillary negative pressure value reaches 50kPa, concrete is close to final set state, now, the micro-crack dyschezia of inside concrete is to recover, therefore, next step sets the intelligence control system 1 temperature controlling mode automatically into the second temperature control stage, guarantee that the stress of concrete 14 is less than its ultimate tensile stress value, avoid producing cracking phenomena,
When the temperature at body of wall center reaches temperature peak value and gradually decreases down temperature TCenter, and with as daily mean temperature TTemperature on averageMeet relational expression TCenter≤TTemperature on averageWhen+10, intelligence control system 1 closes refrigeration machine 2, and now sidewall structure concrete in underground reaches form removal condition, insulated curing need not be carried out again after form removal, just there will be no thermal cracking to produce, now should carry out wet curing or smear sealing compound, the concrete cracking caused to avoid dry shrinkage.
Embodiment
Somewhere lower side wall structure, thickness 80cm, height 6m, it is 20m that single builds length, ambient temperature 34.2 DEG C, use C40 concrete pouring construction, then when concrete not being carried out molding temperature control, concrete molding temperature is 36.4 DEG C, presetting period is 10h, aquation temperature rise is 33.5 DEG C, and engineering effort shows: side wall serious cracking, every 0.8～1.5 meter of thermal cracking; Afterwards, through supercooling raw material, the technological means such as on the rocks, concrete molding temperature controls at 31.5 DEG C, and the presetting period is 10.5h, and aquation temperature rise is 33.2 DEG C, and engineering effort shows: side wall serious cracking, every 1.0～1.6 meters of thermal crackings; The technique effect of twice construction shows, under summer high temperature environment, the engineering effort of the molding temperature that this engineering concrete only reduces about 5 DEG C is inconspicuous, and only reduces initial molding temperature, under the premise not changing body of wall radiating condition, concrete hydrating temperature rise is substantially unaffected.
Adopt the technical method of the present invention, first the concrete concrete ultimate tensile stress every 2～6h in 7d is tested at laboratory, and draw out the concrete ultimate tensile stress curve of this engineering construction C40, adopt temperature control template of the present invention, and carry out pouring construction according to technical method provided by the invention, during construction, ambient temperature is 35.0 DEG C, recording concrete molding temperature is 36.8 DEG C, set the concrete initial set time as 21h, 5 DEG C of low-temperature airflows are passed into by refrigeration machine, after 21h, concrete central temperature is 15.1 DEG C, the actual measurement concrete initial set time is 25h, now the temperature at concrete center is 14.2 DEG C, concrete hydrating temperature rise is 20.1 DEG C, find after concrete form removal, the engineering test phase adopting technical solution of the present invention produces without thermal cracking, engineering effort is good.
Claims (4)
1. a underground sidewall structure concrete thermal cracking Bracking-resistant method, it is characterised in that comprise the steps:
(1) before construction, go out, by stress test testing and drawing, the ultimate tensile stress progress curve that concrete changed with age, and get equipment and accessory ready: temperature control template (8), intelligence control system (1), refrigeration machine (2), stressometer (12), temperature sensor (13), capillary negative pressure sensor (15);
Described temperature control template (8) includes steel plate structure (9) and adiabator plate (10), steel plate structure (9) is concrete surface, steel plate structure (9) forms hollow structure (16) with adiabator plate (10), the corner place of adiabator plate (10) is respectively provided with ventilation interface (5), ventilation interface (5) is connected with described hollow structure (16), the ventilation interface (5) of adjacent temperature control template (8) can pass through to take over (11) and connect, and makes the hollow structure (16) of adjacent temperature control template (8) connect;
Described intelligence control system (1) is using measured stress value, capillary negative pressure value and body of wall central temperature value as the condition controlling refrigeration machine (2) working method, and refrigeration machine (2) manufactures cooling air-flow and passes into temperature control template (8) from ventilation interface (5);
Described intelligence control system (1) also includes data transmission blocks (7), and the numerical value of temperature, stress and capillary negative pressure monitoring can be sent to the control program of intelligence control system (1) by data transmission blocks (7) by the form of wireless transmission;
Intelligence control system (1) includes two temperature control stages: the first temperature control stage: refrigeration machine (2) constant temperature freezes, and is passed into by the air-flows of 5 DEG C in temperature control template (8); The second temperature control stage: refrigeration machine (2) alternating temperature freezes, by adjusting the gas flow temperature passing in temperature control template (8), make stressometer 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, adopt temperature control template (8) molding again, adapter (11) is utilized to be together in series by the hollow structure of the temperature control template of whole sidewall structure, interface (5) of being ventilated the one end of the hollow structure long-chain being together in series is connected with the air shooter of refrigeration machine (2), the other end is as gas outlet, when the low-temperature airflow that refrigeration machine (2) manufactures passes into temperature control template (8) from air shooter (3), the temperature control template of whole side wall is all subject to the cooling of low-temperature airflow, and temperature control die plate temperature reduces;
In advance stressometer (12) is embedded in from temperature control template (8) 1cm ~ 3cm place in the middle part of body of wall, temperature sensor (13) is embedded in the centre of body of wall;
(3) before concrete starts to build, start intelligent temperature control system (1), performed for the first temperature control stage, now, the rapid drop in temperature of temperature control template (8), when concreting, concrete contacts with the temperature control template (8) of cooling, concrete temperature declines, and is equivalent to reduce concrete molding temperature;
Controlling the concrete presetting period is not less than 20 hours;
(4) capillary negative pressure sensor (15) is utilized to test concrete capillary negative pressure after building, the MTD of capillary negative pressure should be below concrete upper surface 10 ~ 20cm, when capillary negative pressure value reaches 50kPa, next step sets the intelligence control system (1) temperature controlling mode automatically into the second temperature control stage;
(5) when the temperature at body of wall center reaches temperature peak value and gradually decreases down temperatureT Center , and with work as daily mean temperatureT Temperature on average Meet relational expressionT Center ≤T Temperature on average +10Time, intelligence control system (1) closes refrigeration machine (2), and now sidewall structure concrete in underground reaches form removal condition.
2. a kind of underground according to claim 1 sidewall structure concrete thermal cracking Bracking-resistant method, it is characterized in that, step (1) sets the gas flow temperature in described second temperature control stage and is not less than 5 DEG C, if when gas flow temperature is 5 DEG C, stressometer measured 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 according to claim 1 sidewall structure concrete thermal cracking Bracking-resistant method, it is characterised in that utilize sealing-plug to seal the ventilation interface (5) not used in step (2).
4. a kind of underground according to claim 1 sidewall structure concrete thermal cracking Bracking-resistant method, it is characterised in that wet curing should be carried out or smear sealing compound after concrete form removal in step (5).
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| CN109680717A (en) * | 2019-01-30 | 2019-04-26 | 武汉市市政建设集团有限公司 | A kind of Underground Rail Transit sidewall structure cracking-proof construction method |
| 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 |
| CN112160443A (en) * | 2020-09-18 | 2021-01-01 | 青岛地铁集团有限公司 | Summer crack resistance construction method for underground side wall structure concrete |
| CN112195979A (en) * | 2020-09-18 | 2021-01-08 | 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 |
| 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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| CN109680717A (en) * | 2019-01-30 | 2019-04-26 | 武汉市市政建设集团有限公司 | A kind of Underground Rail Transit sidewall structure cracking-proof construction 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 |
| CN112160443A (en) * | 2020-09-18 | 2021-01-01 | 青岛地铁集团有限公司 | Summer crack resistance construction method for underground side wall structure concrete |
| CN112195979A (en) * | 2020-09-18 | 2021-01-08 | 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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