CN107859039A - A kind of temperature difference control of coal mill foundations mass concrete and detection method - Google Patents

A kind of temperature difference control of coal mill foundations mass concrete and detection method Download PDF

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Publication number
CN107859039A
CN107859039A CN201710919583.1A CN201710919583A CN107859039A CN 107859039 A CN107859039 A CN 107859039A CN 201710919583 A CN201710919583 A CN 201710919583A CN 107859039 A CN107859039 A CN 107859039A
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concrete
temperature
coal mill
temperature difference
water
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秦国成
张后坤
荣艳格
毕海亮
敦伟龙
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China National Chemical Engineering Sixth Construction Co Ltd
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China National Chemical Engineering Sixth Construction Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes

Abstract

The invention discloses a kind of temperature difference control method of coal mill foundations mass concrete, including addressing to measure, secretly bury electronic temperature measurement line and cooling line, template construction, concrete construction, insulated curing.The concrete that the method for the present invention is produced is relative to existing manufacture craft, significant raising is achieved at volume stability, crack resistance, durability, frost resistance and impervious this five aspects, constructed with the engineering method, not only engineering guarantees both quality and quantity to be accomplished, reduce construction cost, with good economic benefit, social benefit and environmental benefit, application that mass concrete electronic temperature measurement technology will be more and more extensive.

Description

A kind of temperature difference control of coal mill foundations mass concrete and detection method
Technical field
The present invention relates to Pouring technology of mass concrete field, and in particular to a kind of coal mill foundations mass concrete The temperature difference control and detection method.
Background technology
With advancing by leaps and bounds for social development, architectural engineering cause there has also been very big development, the scale of various buildings More and more large-scale, volume of concrete is gradually increased to thousands of, several ten thousand steres by several hectosteres of primary concreting, according to 《GB50496-2009》Regulation concrete structure real object minimum geometries not less than 1 meter or be expected to because of glue in concrete The thermally-induced temperature change of gel material aquation causes concrete caused by crack to belong to mass concrete with shrinking.Therefore build Build the construction for being related to mass concrete in construction often, such as high-rise building basis, large equipment base, water resources dam. And it is well known that mass concrete construction one is considered as weight difficult point engineering technology, the process control and maintenance of construction to by industry Measure is extremely important.Wherein, coal mill foundations is exactly typical mass concrete construction, construction process control and late maintaining Particularly critical, because the binder materials heat of hydration is excessive, and one-time-concreting amount of concrete is big, the control of process control internal-external temperature difference Just turn into the heavy difficult point of mass concrete construction with detection.
Internal-external temperature difference is by the way of circulating chilled water in invention, wherein, it is circulating chilled water using water filling draining is concentrated Innovation, also thick inside concrete thermometric line electronic temperature measurement change traditional pipe laying thermometer thermometric, and data are more accurate, rise To the effect of early time quality control, chemical building sparetime university volume concrete is more and more, popularization in this way be that industry is built Build the developing direction in future.
At present, traditional mass concrete construction method that domestic and international petroleum chemical industry uses is constructed, and is constructed Many of weak point:
(1) construction mass concrete internal-external temperature difference is difficult to control.
(2) waste of material is more, and temperature tube is secretly buried in work progress, causes waste of material, temperature tube is finally with height Press pump whitewashing processing cost is high.
(3) it is unfavorable for live modern-style construction, circulating chilled water concentrated supply and does not concentrate discharge, causes live water Source wastes.
(4) it is unfavorable for the management of construction quality, because pre-buried temperature tube perforate is more, is finally whitewashed and injected with high-pressure pump, do not had Have and vibrate, it is difficult to closely knit, conventional temperature meter temperature measurement data is very untrue, and the difficult control of internal temperature, quality is difficult to ensure that, due to rear The vibrations of phase equipment are larger, and hidden danger is left to equipment installation.
And pre-buried thermometric line electronic temperature measurement and cold water are employed in the method invented and concentrates discharge, ensure that construction quality and Field management.In Industrial Construction Project, mass concrete construction is widely used, particularly large-scale compressor basis, is promoted Modernization mass concrete construction is the direction that engineering construction industry is made great efforts for many years.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of temperature of coal mill foundations mass concrete Difference control and detection method, can control detectable temperature in real time, substantially increase the concrete volume stable of coal mill foundations Property, crack resistance, durability, frost resistance and impermeability.
In order to achieve the above object, the technical solution adopted by the present invention there is provided a kind of coal mill foundations large volume coagulation The temperature difference control method of soil, including addressing measurement, secretly bury electronic temperature measurement line and cooling line, template construction, concrete construction, insulation are supported Shield.
The addressing measurement comprises the following steps that:
S1:Main building axis is prepared according to coal slurry and carries out building positioning, then releases coal pulverizer major axis accordingly;
S2:Absolute altitude presses main building absolute altitude, thus coal mill foundations level measurement is drawn;
S3:Line setting range accuracy is controlled within a ten thousandth, and angle-measurement accuracy is controlled within 15 degree, interlayer Perpendicularity deviation is controlled within 2.5mm, and building overall height squareness measurement deviation is controlled in 3.2h/10000, and is not more than 9mm。
Described the step of secretly burying electronic temperature measurement line and cooling line, is as follows:
S1:Coal mill foundations is only in surrounded surface, top surface and bottom plate cloth muscle, the pre-buried top at -1.6 meters of coal mill foundations Guide pile, coal mill foundations are provided with top surface reinforcing bar, service sleeve and reserving hole template, are supported by full hall frame;
S2:The vertical and horizontal reinforcing bar of side elevation is fixed using bracing members frame, is arranged along long side direction, and one is linked as with the full hall frame in basis Body, after reinforcing bar colligation is complete, makees bridging with reinforcing bar, tie the intersection point of vertical bars and transverse steel, the bridging is arranged in side Facade and basic corner;
S3:Electronic temperature measurement line is buried in concrete according to the surface area of concrete, every thermometric line is furnished with multiple temperature Sensor, the temperature sensor arrange in upper, middle and lower 30-60 degree, place three thermometric lines in concrete surface, every sets one Individual temperature sensor, it is placed on below covering and heat insulating layer and is used to measure surface temperature of concrete, and each temperature measuring point is numbered Record;
S4:Cooling line is buried in concrete according to the surface area of concrete, the cooling line is by cooling circulating water pipe Road is installed according to the circulatory system of left, center, right three, and it is 2300mm that cooling circulating water pipe, which installs lower centre-to-centre spacing, in left and right The heart is away from for 1000mm, and three system circulation water pipes in arranging in a zigzag.
The deep point depth distance bottom plate bottom surface 50mm of the electronic temperature measurement line, midpoint depth is the half of base plate thickness, shallow Point depth be away from basic top surface 50mm at, other temperature measuring points are arranged according to 600mm spacing.
The cooling line makees condensate pipe, termination tapping using steel pipe, and is connected with union elbow with straight connector, fixed With on bracing members frame, and having twined cold glue band preventing water leakage, during by condenser pipe and reinforcing bar fixation to prevent filling concrete, make firm by ramming Influence causes to fail, and one of valve is respectively set in the intake-outlet of condenser pipe, with the direction of control water inlet and flow.
The concrete construction comprises the following steps that:
S1:Preparation before pouring:Check mold plate verticality, cooling water circulation pipeline, the sealing of weld and electronic, horological Warm line secretly buries position and absolute altitude;
S2:Concreting:Overall continuous placing is carried out, lift height is set to 500mm, reserves between layers necessarily Time interval, meanwhile, ensure that concrete placings interval time control between layers is completed before concrete initial set, single coal mill foundations The concreting time is 16 hours;
S3:Concrete vibrating:Vibrate direction for lower vertical in casting direction from bottom to top, upper strata vibrate from upper and Under;
S4:Second coagulation soil vibrates:This time is vibrated 1-2 hour of the control after pouring, and controls the presetting period so that under Before the initial set of layer concrete portion, upper layer concrete can cover.
The conveying of the concrete uses bottom plate pump concrete, after pouring at the beginning of the concrete, is scraped according to absolute altitude with flat board It is flat, pressed more than three times with trowel bat before initial set, be twisted into pitted skin, water crack seam is received to close, when pressing last time with trowel bat, Numb road is straight, ensures that lines a line presses a line and mutual piece is parallel using East and West direction as ridge orientation.
The insulated curing comprises the following steps that:
S1:From discarded geotextiles, the covering and heat insulating moisturizing at once after concreting is fixed after concrete initial set When sprayed water in geotextiles, it is ensured that concrete surface moisture is sufficient;
S2:Curing time before guarantee form removal, insulated curing is realized to concrete by template, cooling water pipe continues water flowing 4 More than it, until the water of condenser pipe delivery port stops water flowing after being down to normal temperature.
As a kind of improve and perfect of this programme, present invention also offers a kind of coal mill foundations mass concrete Temperature difference detection method, is comprised the following steps:
S1:Temperature index control is as follows:
Internal-external temperature difference:Less than 25 DEG C;
Cooling rate:Less than 1-1.5 DEG C/d;
Open temperature difference during heat-insulation layer:Less than 20 DEG C;
S2:Detection cycle is as follows with frequency:
Concreting terminates latter 1-4 days:Survey once within every 2 hours;
Concreting terminates latter 5-7 days:Survey once within every 4 hours;
7 days-thermometric terminates after concreting terminates:Survey once within every 12 hours;
When concrete surface temperature and ambient temperature differences are less than 20 DEG C, stop thermometric.
In temperature controlled processes, temperature difference between inside and outside concrete is not more than 25 degree, and cooling daily is not more than 1.5 degree, and concrete pours After building, the temperature control and thermometric work, thermometric of strengthening concrete are no more than 70 DEG C.
Compared with prior art, the present invention has following beneficial effect:
(1) coal mill foundations mass concrete applying electronic thermometric line is secretly embedded in coal mill foundations bottom plate, centre and top At portion's different level, temperature everywhere directly can be learnt by temperature measuring gauge, can control what hydration heat of concrete was brought in early days Hidden danger of quality.
(2) coal pulverizer Massive Concrete Foundation Slab uses electronic temperature measurement line, has effectively saved the material of dark bushing burying.
(3) coal pulverizer mass concrete electronic temperature measurement is constructed, effective detection temperature difference between inside and outside concrete, while gives coagulation Native circulating chilled water provides accurately foundation.
(4) coal mill foundations improves the concrete density of coal mill foundations so that concrete using thermometric line is secretly buried Meet design and code requirement, extend the service life of coal mill foundations.
(5) coal pulverizer mass concrete construction make it that maintenance provides critically important after concreting with electronic temperature measurement Foundation, quality is more prone to control, and the construction cost of project is also minimized, and achieves certain economic benefit.
(6) coal mill foundations pours the design strength that rear coagulation soil scene rebound data has reached concrete.
Embodiment
Below come by way of specific embodiment to the present invention specific embodiment be described in further detail, But following examples only play the effect for helping to understand the present invention, can not be not understood as limitation of the invention further.
Embodiment one:A kind of temperature difference control method of coal mill foundations mass concrete, including addressing measure, secretly bury electricity Sub- thermometric line and cooling line, template construction, concrete construction, insulated curing.
The addressing measurement comprises the following steps that:
S1:Main building axis is prepared according to coal slurry and carries out building positioning, then releases coal pulverizer major axis accordingly;
S2:Absolute altitude presses main building absolute altitude, thus coal mill foundations level measurement is drawn;
S3:Line setting range accuracy is controlled within a ten thousandth, and angle-measurement accuracy is controlled within 15 degree, interlayer Perpendicularity deviation is controlled within 2.5mm, and building overall height squareness measurement deviation is controlled in 3.2h/10000, and is not more than 9mm。
Described the step of secretly burying electronic temperature measurement line and cooling line, is as follows:
S1:Coal mill foundations is only in surrounded surface, top surface and bottom plate cloth muscle, the pre-buried top at -1.6 meters of coal mill foundations Guide pile, coal mill foundations are provided with top surface reinforcing bar, service sleeve and reserving hole template, are supported by full hall frame;
S2:The vertical and horizontal reinforcing bar of side elevation is fixed using bracing members frame, is arranged along long side direction, and one is linked as with the full hall frame in basis Body, after reinforcing bar colligation is complete, makees bridging with reinforcing bar, tie the intersection point of vertical bars and transverse steel, the bridging is arranged in side Facade and basic corner;
S3:Electronic temperature measurement line is buried in concrete according to the surface area of concrete, every thermometric line is furnished with multiple temperature Sensor, the temperature sensor arrange in upper, middle and lower 30-60 degree, place three thermometric lines in concrete surface, every sets one Individual temperature sensor, it is placed on below covering and heat insulating layer and is used to measure surface temperature of concrete, and each temperature measuring point is numbered Record;
S4:Cooling line is buried in concrete according to the surface area of concrete, the cooling line is by cooling circulating water pipe Road is installed according to the circulatory system of left, center, right three, and it is 2300mm that cooling circulating water pipe, which installs lower centre-to-centre spacing, in left and right The heart is away from for 1000mm, and three system circulation water pipes in arranging in a zigzag.
The deep point depth distance bottom plate bottom surface 50mm of the electronic temperature measurement line, midpoint depth is the half of base plate thickness, shallow Point depth be away from basic top surface 50mm at, other temperature measuring points are arranged according to 600mm spacing.
The cooling line makees condensate pipe, termination tapping using steel pipe, and is connected with union elbow with straight connector, fixed With on bracing members frame, and having twined cold glue band preventing water leakage, during by condenser pipe and reinforcing bar fixation to prevent filling concrete, make firm by ramming Influence causes to fail, and one of valve is respectively set in the intake-outlet of condenser pipe, with the direction of control water inlet and flow.
The concrete construction comprises the following steps that:
S1:Preparation before pouring:Check mold plate verticality, cooling water circulation pipeline, the sealing of weld and electronic, horological Warm line secretly buries position and absolute altitude;
S2:Concreting:Overall continuous placing is carried out, lift height is set to 500mm, reserves between layers necessarily Time interval, meanwhile, ensure that concrete placings interval time control between layers is completed before concrete initial set, single coal mill foundations The concreting time is 16 hours;
S3:Concrete vibrating:Vibrate direction for lower vertical in casting direction from bottom to top, upper strata vibrate from upper and Under;
S4:Second coagulation soil vibrates:This time is vibrated 1-2 hour of the control after pouring, and controls the presetting period so that under Before the initial set of layer concrete portion, upper layer concrete can cover.
The conveying of the concrete uses bottom plate pump concrete, after pouring at the beginning of the concrete, is scraped according to absolute altitude with flat board It is flat, pressed more than three times with trowel bat before initial set, be twisted into pitted skin, water crack seam is received to close, when pressing last time with trowel bat, Numb road is straight, ensures that lines a line presses a line and mutual piece is parallel using East and West direction as ridge orientation.
The insulated curing comprises the following steps that:
S1:From discarded geotextiles, the covering and heat insulating moisturizing at once after concreting is fixed after concrete initial set When sprayed water in geotextiles, it is ensured that concrete surface moisture is sufficient;
S2:Curing time before guarantee form removal, insulated curing is realized to concrete by template, cooling water pipe continues water flowing 4 More than it, until the water of condenser pipe delivery port stops water flowing after being down to normal temperature.
A kind of temperature difference detection method of coal mill foundations mass concrete, is comprised the following steps:
S1:Temperature index control is as follows:
Internal-external temperature difference:Less than 25 DEG C;
Cooling rate:Less than 1-1.5 DEG C/d;
Open temperature difference during heat-insulation layer:Less than 20 DEG C;
S2:Detection cycle is as follows with frequency:
Concreting terminates latter 1-4 days:Survey once within every 2 hours;
Concreting terminates latter 5-7 days:Survey once within every 4 hours;
7 days-thermometric terminates after concreting terminates:Survey once within every 12 hours;
When concrete surface temperature and ambient temperature differences are less than 20 DEG C, stop thermometric.
In temperature controlled processes, temperature difference between inside and outside concrete is not more than 25 degree, and cooling daily is not more than 1.5 degree, and concrete pours After building, the temperature control and thermometric work, thermometric of strengthening concrete are no more than 70 DEG C.
Embodiment two:
Addressing measures:
S1:Main building axis is prepared according to coal slurry and carries out building positioning, then releases coal pulverizer major axis accordingly;
S2:Absolute altitude presses main building absolute altitude, thus coal mill foundations level measurement is drawn;
S3:Line setting range accuracy is controlled within a ten thousandth, and angle-measurement accuracy is controlled within 15 degree, interlayer Perpendicularity deviation is controlled within 2.5mm, and building overall height squareness measurement deviation is controlled in 3.2h/10000, and is not more than 9mm。
Reinforcement construction:
S1:Reinforcement construction is constructed by sequence of construction arrangement, and coal mill foundations is only in surrounded surface, top surface and bottom plate cloth Muscle, the pre-buried top guide pile at -1.4 meters of coal mill foundations, coal mill foundations are provided with top surface reinforcing bar, service sleeve and pre- Box out hole template, pass through full hall frame and support;
S2:The vertical and horizontal reinforcing bar of side elevation is fixed using bracing members frame, is arranged along long side direction, and one is linked as with the full hall frame in basis Body;After reinforcing bar colligation is complete, makees bridging with reinforcing bar, tie the intersection point of vertical bars and transverse steel, the bridging is arranged in Side elevation and basic corner.
Template construction:
S1:Coal mill foundations uses plain form, is reinforced by split bolt, and the level interval of the split bolt≤ 450mm, vertical spacing≤600mm flitches and double scaffold tubes are reinforced, and first cloth erects stupefied, and rear cloth horizontal stroke is stupefied, is set up outside basic mould bases double Scaffold is arranged, foundation forms supporting is connected as a single entity with double-pole scaffold, so as to form relatively more firm steel-support;
S2:The plain form is installed using whole plate, reduces piece.Template back surface uses flitch to add cervical rib to reinforce, Steel pipe is laterally used, outside forms closing ring, laterally using bearing diagonal, to ensure template system using horizontal steel tube surrounding envelope angle The stability of system;
S3:Piece between template uses fluid sealant close joint, with mortar leakage prevention;
S4:Coal pulverizer installation is constructed by the way of preformed hole and embedded foundation bolt box, and basic hole is reserved Wooden model is then used, steel plate is placed on below bed die and welds round steel to remove wooden model;
S5:Coal mill foundations hole is first good by hole template construct when constructing, and puts line well before concrete construction, determines hole position Put, then template is buried and is fixed, be welded on round steel auxiliary on reinforcement foundation.
Concrete is constructed:
S1:By reinforcement foundation, the complete rear progress concreting of template construction;
S2:It is ready to match material before concreting, wherein, coal mill foundations concrete selects slag silicate salt solution Mud, coarse aggregate uses continuous grading, sand in fine aggregate use, and adds antifreezing agent;
S3:Concrete construction uses mixing plant commerical ready-mixed concrete, tank car transport, the arrangement and method for construction that pump truck pours, concrete Order is poured to be carried out successively from east orientation west, before concrete construction, cement, sand, stone, additive etc. are tested, after qualified Constructed.
Wherein, concrete mix provides after trial, and the control of match ratio sand coarse aggregate ratio is 40%~50%, and stone sizes are not More than 1/3 pump line caliber, the slump preferably controls is not less than 90min in 100~120mm, concrete mixing time.
FS-H type water reducers are added, reduce the heat of hydration.
Before casting concrete, first construction joint is no less than 24 hours with water infiltration, the debris cleaned out in template, and it is right Template, reinforced bar engineering carry out level Four inspection, checked and accepted, qualified after-pouring concrete.
Concrete conveyance is transported to job site using concrete transportation automobile from concrete mixing plant, uses concrete conveyance Pump completes pouring for whole base concrete.Concreting layering is carried out, and makes engagement closely knit.Concrete placings use scheme as one The gradient, thin concrete lift, the operating type of incremental cast, concrete walk around to the mode of pouring using planar layer, and every layer pours thickness Control can preferably adapt to pumping technology, avoid pump line in 1500mm, the trickling length control of concrete bottom in 8-10m, this method Frequent flushing and connect and vibrator is inserted when smashing vibrate direction with direction of propulsion on the contrary, being carried out from bottom to top along inclined-plane, it is gradual on Move, the vibrating time of each jolt ramming is 15~20S.1.5 times that point spacing is not more than operating radius are inserted, inclined plane delamination vibrates, and shakes When smashing last layer concrete, vibrator should insert lower floor 50~100mm of concrete, ensure to connect between each layer, be spaced between levels and do not surpass Spend the presetting period of concrete.The operation of vibrating spear will accomplish that fast insert is dialled slowly, in process of vibrating, slightly twitch up and down, so that up and down Vibration is uniformly closely knit, eliminates two bed joints.In pour concrete, the vibrating head of arrangement three before and after pouring belt, first of cloth Put in the emptying point of concrete, mainly solve the top jolt ramming of concrete, second is arranged in the middle part of the slope of concrete, it is ensured that in The jolt ramming of portion's concrete, the 3rd is arranged at concrete slope angle, it is ensured that the jolt ramming of bottom concrete.
To prevent concrete from concentrating accumulation, discharge outlet of first shaking concrete, the nature trickling gradient is formed, is then shaken comprehensively Smash, and strictly control vibrating time, the mobile spacing of vibrating head and insertion depth.
Coal mill foundations is mass concrete, and technology intermission is taken when pouring, intermittently must not exceed 45min every time, with Ensure the safety and stability of shuttering supporting, when pouring, should often observe template, when reinforcing bar change, such as discovery deform, are mobile, immediately Stopping pours, and is fixed before the concrete initial set poured.
Due to coal mill foundations category mass concrete, first, should try one's best reduces the heat of hydration:The low-heat cement from, most Slag cements is used well;Secondly concrete casting molding temperature is reduced:Avoid pouring during high temperature as far as possible, as far as possible after at 3 points in afternoon and Night pours, and fills retarding water reducer;Secondly, the ultimate tensile strength of concrete is improved:Reasonable selection match ratio, select good The coarse-fine aggregate of good grading, strictly controls clay content, strengthens the amplitude of concrete, improves concrete density and tensile strength, Reduce and shrink, ensure construction quality, take secondary batching method, secondary vibration method, exclude surface bleeding after pouring in time, to improve Concrete strength, strengthen the early curing of concrete, improve the tensile strength and modulus of elasticity of early stage corresponding age.
Temperature measuring wire, the complete timing thermometric of concreting are also arranged in advance, and are used and covered thick gunnysack and water seasoning, Curing time is no less than 15 days, and sets special messenger's timing thermometric, when such as finding temperature difference between inside and outside concrete close to 25 DEG C, takes guarantor immediately Warm measure (covering tarpaulin) solves, and to reduce internal-external temperature difference, prevents crack.Temperature measuring wire is arranged that set up and down by blossom type at every Two wires.
Therefore, it is single using mineral wool, rock wool is capped layer of plastic film can not meet mass concrete site operation It is required that it need to take measures to reduce concrete internal and external temperature.
Cooling water water inlet uses Valve controlling, and the flow velocity of water is adjusted according to thermometric record, both controlled in concrete The rising of heart temperature, it is too fast also to prevent that temperature from declining, causes concrete cracking.
Crack Control Technology measure:
Mass concrete due to, the speed block big compared with high, cooling extent that heated up caused by the heat of hydration, make concrete produce compared with Big temperature and shrinkage stress is the main reason for causing concrete to produce crack.Calculating analysis should be carried out before construction, takes and arranges Apply control thermal cracking.
The measure of constraint thermal cracking in control:
S1:Temperature difference between inside and outside concrete, surface and the extraneous temperature difference are controlled, concrete surface quick refrigeration is prevented, using coagulation Native surface heat preservation measure;
S2:Strengthen concrete curing, strictly control heating speed of concrete, the concrete surface covering temperature difference is less than 8-10 ℃。
The measure of the outer constraint thermal cracking of control:
S1:Concrete out-of-machine temperature, temperature rise, reduction temperature difference etc. are controlled from taking, and improves construction manipulation process;
S2:Using low-heat cement, portland slag cement is selected;It is a certain proportion of using late strength of concrete, incorporation Flyash, high efficiency water reducing agent or retarder etc.;
S3:Swelling agent is mixed, in the moist maintenance of initial 14 days, makes volume of concrete microdilatancy, compensating concrete morning Contraction fissure caused by phase dehydration shrinkage;
S4:Improve grading of aggregates, by the block stone of admixture 15% in mass concrete;
S5:Mixing ice using mixing water reduces coolant-temperature gage, and shading sun-proof is sprayed to sandstone aggregate or cold water cools down, bulk cement carries Preceding deposit, the excessively high measure of cement temperatures of newly dispatching from the factory is avoided, to reduce the out-of-machine temperature of concrete;
S6:Reasonable arrangement working procedure progress thin layer, which pours, to be smash, and is uniformly risen, in order to radiate;
S7:Mass concrete is constructed, and cooling water pipe can be buried in basis, temperature difference between inside and outside concrete is less than 25 ℃;
S8:Reasonable jointing and blocking construction, post-cast strip should be set to long structure;To basement rock or old concrete bed course, In surface sanding bed course, to eliminate basement rock constraint and wedge action;
S9:Appropriately configured temperature reinforcement, reduce concrete temperature stress;
S10:Strengthen the maintenance of concrete, proper extension curing time and striking time, make concrete surface Slow cooling.
The laying of temperature measuring point:
Thermometric line is buried in concrete according to the surface area of concrete, every thermometric line is furnished with three temperature sensors (temperature measuring point), two, center, away from one at the 200mm of surface, away from one at the 500mm of bottom.Three surveys are placed in concrete surface Warm line, every sets a temperature sensor, for measuring surface temperature of concrete (being placed on below covering and heat insulating layer).And to each Record is numbered in temperature measuring point.
Temperature survey:
After casting concrete, carry out thermometric with building electronic instrument for measuring temperature within every 2 hours, made a record by special messenger, until mixed Solidifying soil temperature degree is less than 25 degree with the environment temperature temperature difference to be stopped measuring.
Mass concrete easily produces thermal cracking due to hydration heat of cement, therefore, reduces the heat of hydration, reduces aquation Temperature rise, temperature difference between inside and outside concrete is effectively controlled, it is the key for ensureing large volume pouring construction quality to prevent thermal cracking.By mixed Native thin concrete lift is coagulated, is vibrated, the temperature and shrink crack of inside concrete can be effectively reduced by smearing the measure such as pressure, insulation.
Cooling circulating water pipeline is installed:
Cooling circulating water pipeline is installed according to the circulatory system of left, center, right three.Cooling circulating water pipe install it is lower in The heart is away from being 1000mm for 2300mm, left and right centre-to-centre spacing, and three system circulation water pipes are in arrangement in a zigzag.
Apply method:
Condensate pipe, termination tapping are made using steel pipe, and connected with union elbow with straight connector, fixed and bracing members frame On, should be firm during connection, and twine cold glue band preventing water leakage, by condenser pipe with reinforcing bar fixation to prevent filling concrete, smash Gu when influence cause to fail.One of valve is respectively set in the intake-outlet of condenser pipe, with the direction of control water inlet and flow.
Filling concrete starts logical cooling water after finishing surface initial set, ensures from the water that water inlet enters it is that cold water is (normal Warm water), intake-outlet exchanges once for every eight hours so that than more uniform, reduction thermal cracking goes out mass concrete internal temperature Existing possibility.
To ensure that condensate pipe normal water supply circulates, between water inlet and delivery port, increase by a cooling circulating water pond.
Temperature control process controls:
S1:In order to accurately control temperature difference of mass concrete, grasp at different depth temperature change and the construction stage it is early, The rule of development of the mid-term temperature difference, one auto-controller is set in basic side, to determine the electricity of copper thermistor temperature sensor Resistive, and connect into three control loops with the autoelectrinic magnetic force whistle control system of multi-stage water pump;
S2:The intelligent signal control system is with base concrete inner, middle and outer layer temperature and the temperature difference of surface temperature of concrete Change is turned to control point.The mass concrete gradient temperature difference is no more than 25 DEG C;During more than 25 DEG C ± 2 DEG C, intelligence system opens automatically Dynamic multi-stage water pump shifts up and increases water-carrying capacity, if the temperature of cooling circulating water pond reclaimed water is lower than mass concrete central temperature institute When being worth≤10 DEG C, sump water temperature regulation is carried out by moisturizing pipeline, until coagulation can be effectively reduced by reaching cooling circulating water Untill soil temperature degree.Overflow pipe is also set up in cooling circulating water pond or preset compact submersible pump discharges high-temperature water in time;
S3:Temperature control and thermometric record must be carried out continuously, and the automatic record of auto-controller is carried out according to following regulations Artificial monitoring:
1. the first seven day according at interval of 2 hour records once;
2. thermometric record number, every 4 hour record 1 time are accordingly reduced according to concrete actual temperature difference after seven days;
3. it is carried out continuously the thermometric record time to be no less than 14 days;
It was found that partly or wholly temperature raises, carry out manually adjusting recirculated water flow velocity in time or adjust the maintenance material of base surface Material, the difference of concrete foundation central temperature and ambient temperature is set to be not more than 20 DEG C;
S4:Temperature Controlling of Mass Concrete and curing time:Difference according to concrete monitoring temperature is determined, surface of base Maintenance is using the covering of the materials such as gunnysack, straw bag, plastic cloth.Concrete placings after first circulating water pipe 8 hours has been covered (i.e. open by concrete During beginning temperature rise) start to start corresponding circulation, after the completion of concrete placings, when temperature difference between inside and outside concrete is less than for three days on end During 25 DEG C of codes and standards value, stop circulating water cooling, generally 10d or so.After cooling circulating water stops, mass concrete is used Circulating water pipe is filled real by the cement mortar with match ratio.
Insulated curing:
Insulated curing is the important step of mass concrete construction one, and main function is to ensure that concrete surface moisture fills Foot, avoids the occurrence of plastic shrinkage cracks;The inside and outside temperature approach of casting of concrete in mass block is reduced to reduce concret block Constraint stress;The cooling rate of mass concrete is reduced, the tensile strength of concrete is made full use of, to improve concrete Block bears anti-crack ability during outside bound stress, reaches the purpose for preventing or controlling thermal cracking.
The insulation material that the present invention selects is discarded geotextiles, the covering and heat insulating moisturizing at once after concreting, After concrete initial set, regularly sprayed water in geotextiles, it is ensured that concrete surface moisture is sufficient.
Curing time before guarantee form removal, insulated curing is realized by template to concrete.Cooling water pipe continue water flowing 4 days with On, until the water of condenser pipe delivery port can stop water flowing after being down to normal temperature.
A kind of temperature difference detection method of coal mill foundations mass concrete, is comprised the following steps:
S1:Temperature index control is as follows:
Internal-external temperature difference:Less than 20 DEG C;
Cooling rate:Less than 1.5-2.0 DEG C/d;
Open temperature difference during heat-insulation layer:Less than 15 DEG C;
S2:Detection cycle is as follows with frequency:
Concreting terminates latter 1-4 days:Survey once within every 1 hour;
Concreting terminates latter 5-7 days:Survey once within every 2 hours;
7 days-thermometric terminates after concreting terminates:Survey once within every 10 hours;
When concrete surface temperature and ambient temperature differences are less than 20 DEG C, stop thermometric.
In temperature controlled processes, temperature difference between inside and outside concrete is not more than 20 degree, and cooling daily is not more than 2 degree, concreting After, the temperature control and thermometric work, thermometric of strengthening concrete are no more than 60 DEG C.
Also, by many experiments, drawn after calculating analysis, the concrete that method of the invention is produced is relative to existing Manufacture craft, achieved at volume stability, crack resistance, durability, frost resistance and impervious this five aspects significant Improve.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art is not departing from the principle and objective of the present invention In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification, it is carried out simply Combination change be all classified as the present invention protection within.

Claims (10)

  1. A kind of 1. temperature difference control method of coal mill foundations mass concrete, it is characterised in that:Including addressing measurement, secretly bury electricity Sub- thermometric line and cooling line, template construction, concrete construction, insulated curing.
  2. 2. the temperature difference control method of coal mill foundations mass concrete according to claim 1, it is characterised in that:It is described Addressing measurement comprises the following steps that:
    S1:Main building axis is prepared according to coal slurry and carries out building positioning, then releases coal pulverizer major axis accordingly;
    S2:Absolute altitude presses main building absolute altitude, thus coal mill foundations level measurement is drawn;
    S3:Line setting range accuracy is controlled within a ten thousandth, and angle-measurement accuracy is controlled within 15 degree, and interlayer is vertical Deviation control is spent within 2.5mm, and building overall height squareness measurement deviation is controlled in 3.2h/10000, and is not more than 9mm.
  3. 3. the temperature difference control method of coal mill foundations mass concrete according to claim 1, it is characterised in that:It is described The step of secretly burying electronic temperature measurement line and cooling line is as follows:
    S1:Coal mill foundations positions only in surrounded surface, top surface and bottom plate cloth muscle on the pre-buried top in -1.6 meters of places of coal mill foundations Stake, coal mill foundations are provided with top surface reinforcing bar, service sleeve and reserving hole template, are supported by full hall frame;
    S2:The vertical and horizontal reinforcing bar of side elevation is fixed using bracing members frame, is arranged along long side direction, is connected as a single entity with the full hall frame in basis, steel After muscle colligation is complete, makees bridging with reinforcing bar, tie the intersection point of vertical bars and transverse steel, the bridging be arranged in side elevation with Basic corner;
    S3:Electronic temperature measurement line is buried in concrete according to the surface area of concrete, every thermometric line is furnished with multiple TEMPs Device, the temperature sensor arrange in upper, middle and lower 30-60 degree, place three thermometric lines in concrete surface, every sets a temperature Sensor is spent, is placed on below covering and heat insulating layer and is used to measure surface temperature of concrete, and record is numbered to each temperature measuring point;
    S4:According to the surface area of concrete in concrete bury cooling line, the cooling line be by cooling circulating water pipeline by Installed according to the circulatory system of left, center, right three, it is 2300mm that cooling circulating water pipe, which installs lower centre-to-centre spacing, left and right centre-to-centre spacing For 1000mm, three system circulation water pipes are in arrangement in a zigzag.
  4. 4. the temperature difference control method of coal mill foundations mass concrete according to claim 3, it is characterised in that:It is described The deep point depth distance bottom plate bottom surface 50mm of electronic temperature measurement line, midpoint depth is the half of base plate thickness, and shallow depth is away from base At plinth top surface 50mm, other temperature measuring points are arranged according to 600mm spacing.
  5. 5. the temperature difference control method of coal mill foundations mass concrete according to claim 3, it is characterised in that:It is described Cooling line makees condensate pipe, termination tapping using steel pipe, and is connected with union elbow with straight connector, fixed and bracing members frame On, and twined cold glue band preventing water leakage, by condenser pipe with reinforcing bar fixation to prevent filling concrete, make firm by ramming when influence cause to lose Effect, one of valve is respectively set in the intake-outlet of condenser pipe, with the direction of control water inlet and flow.
  6. 6. the temperature difference control method of coal mill foundations mass concrete according to claim 1, it is characterised in that:It is described Concrete construction comprises the following steps that:
    S1:Preparation before pouring:Check mold plate verticality, cooling water circulation pipeline, the sealing of weld and electronic temperature measurement line Secretly bury position and absolute altitude;
    S2:Concreting:Overall continuous placing is carried out, lift height is set to 500mm, reserves the regular hour between layers Interval, meanwhile, ensure that concrete placings interval time control between layers is completed before concrete initial set, single coal mill foundations coagulation Soil poured the time as 16 hours;
    S3:Concrete vibrating:Vibrate direction for lower vertical in casting direction from bottom to top, upper strata is vibrated from top to bottom;
    S4:Second coagulation soil vibrates:This time is vibrated 1-2 hour of the control after pouring, and controls the presetting period so that mix in lower floor Before coagulating native portion's initial set, upper layer concrete can cover.
  7. 7. the temperature difference control method of coal mill foundations mass concrete according to claim 6, it is characterised in that:It is described The conveying of concrete uses bottom plate pump concrete, after pouring at the beginning of the concrete, is struck off with flat board according to absolute altitude, is used before initial set Trowel bat is pressed more than three times, is twisted into pitted skin, and water crack seam is received to close, and when pressing last time with trowel bat, numb road is straight, to the east of West ensures that lines a line presses a line and mutual piece is parallel to for ridge orientation.
  8. 8. the temperature difference control method of coal mill foundations mass concrete according to claim 1, it is characterised in that:It is described Insulated curing comprises the following steps that:
    S1:From discarded geotextiles, the covering and heat insulating moisturizing at once after concreting, after concrete initial set, regularly exist Sprayed water in geotextiles, it is ensured that concrete surface moisture is sufficient;
    S2:Ensure curing time before form removal, insulated curing realized to concrete by template, cooling water pipe continue water flowing 4 days with On, until the water of condenser pipe delivery port stops water flowing after being down to normal temperature.
  9. A kind of 9. temperature difference detection method of the coal mill foundations mass concrete described in claim 1, it is characterised in that:Comprising Following steps:
    S1:Temperature index control is as follows:
    Internal-external temperature difference:Less than 25 DEG C;
    Cooling rate:Less than 1-1.5 DEG C/d;
    Open temperature difference during heat-insulation layer:Less than 20 DEG C;
    S2:Detection cycle is as follows with frequency:
    Concreting terminates latter 1-4 days:Survey once within every 2 hours;
    Concreting terminates latter 5-7 days:Survey once within every 4 hours;
    7 days-thermometric terminates after concreting terminates:Survey once within every 12 hours;
    When concrete surface temperature and ambient temperature differences are less than 20 DEG C, stop thermometric.
  10. 10. the temperature difference detection method of coal mill foundations mass concrete according to claim 9, it is characterised in that:Temperature Spend in control process, temperature difference between inside and outside concrete is not more than 25 degree, and cooling daily is not more than 1.5 degree, after concreting, adds Temperature control and the thermometric work of reinforced concrete, thermometric are no more than 70 DEG C.
CN201710919583.1A 2017-09-30 2017-09-30 A kind of temperature difference control of coal mill foundations mass concrete and detection method Pending CN107859039A (en)

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