CN107160551A - A kind of cold district winter prefabricated case beam concrete construction method - Google Patents
A kind of cold district winter prefabricated case beam concrete construction method Download PDFInfo
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- CN107160551A CN107160551A CN201710509765.1A CN201710509765A CN107160551A CN 107160551 A CN107160551 A CN 107160551A CN 201710509765 A CN201710509765 A CN 201710509765A CN 107160551 A CN107160551 A CN 107160551A
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- 238000010276 construction Methods 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000012423 maintenance Methods 0.000 claims abstract description 13
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 4
- 239000004746 geotextile Substances 0.000 claims description 4
- 239000008236 heating water Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000011499 joint compound Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
Abstract
The invention provides a kind of cold district winter prefabricated case beam concrete construction method, comprise the following steps：Pour preparation making template and pour progress quality inspection maintenance and be ready for conserving natural curing.The present invention carries out heating to aggregate using steam and mixed and stirred, pour after shaping using steam curing greenhouse to prefabricated case beam structure progress constant temperature, the maintenance of constant humidity, both being normally carried out for cold season in winter prefabricated case beam concrete construction had been ensure that, the intensity of concrete is in turn ensure that, standard curing condition has been basically reached；The temperature control being related to is by the way of pre-buried temperature sensor inside and outside component, and simple to operate, temperature control is accurately sensitive, and construction technology is more scientific.
Description
Technical field
The present invention relates to a kind of cold district winter prefabricated case beam concrete construction method, belong to concrete prefabricated element system
Make field.
Background technology
During bridge and highway engineering construction, box beam component typically all first carries out prefabricated, then is transported to construction
Place is assembled, but the need for being due to influence and the project progress by natural climate, it is sometimes inevitable the need for
The prefabricated of cold weather concrete box beam is carried out, (presence of casing deposits concrete structure to prefabricated case beam due to being influenceed by structure
Internally cavity), if working measure takes improper, not only cause concrete members intensity not catch up with, more easily cause concrete and support
Internal-external temperature difference during shield, so as to produce the accidents resulting from poor quality of projects such as distress in concrete or leave hidden danger of quality to engineering.
The problem of existing for concreting in cold-weather, mainly has by the way of at present：Adjust match ratio, aggregate heating
Mix and stir, add the modes such as additive, external heat, but nearly all there is limitation and use condition in every kind of method.
The content of the invention
In order to solve the above technical problems, the invention provides a kind of cold district winter prefabricated case beam concrete construction side
Method, the cold district winter prefabricated case beam concrete construction method solves existing prefabricated case beam structural concrete winter construction work
The problem of skill imperfection, curing temperature and humidity can not be constant.
The present invention is achieved by the following technical programs.
A kind of cold district winter prefabricated case beam concrete construction method that the present invention is provided, comprises the following steps：
1. preparation is poured：Prepare equipment and material and detect, make a record；
2. make template and pour：Prefabricated case beam template is made, prefabricated place is transported to, and concrete is carried out to template and pour
Build, while pre-buried temperature sensor；
3. quality inspection is carried out：After the completion of to step 2. in prefabricated case beam carry out quality inspection and eliminate below standard fractional error；
4. maintenance prepares：To step 3. in prefabricated case beam carry out steam curing canopy in conserve prepare；
5. conserved：Steam heating, the method for thermostatic curing is taken to conserve prefabricated case beam；
6. natural curing：After concrete strength is up to standard, prefabricated case beam is cooled, form removal, into natural curing rank
Section.
1. the step is divided into following steps：
(1.1) steam boiler and pipeline are detected, it is ensured that steam boiler send vapour normally to run and not damage；
(1.2) according to mix calculation, temperature measuring is carried out to sandstone aggregate, when aggregate temperature is -3 DEG C, water temperature reaches
50 DEG C can ensure concrete molding temperature more than 10 DEG C, and actual water temperature is counted according to live aggregate temperature and environment temperature
Calculate, and water heating-up temperature is not higher than 80 DEG C；
(1.3) concrete mixing water is heated up using steam-heated method, steam is conveyed by steam boiler
Into live cistern, raise water temperature in cistern, while parcel heat-barrier material on the outside of cistern, prevents heat loss.
The aggregate is made up of sand, stone, cement and flyash.
The aggregate use the agitating mode of steam heating water mixing concrete for：First Jiang Shui, sand, stone are mixed thoroughly, are added water
Mud, flyash and additive, it is to avoid cement is directly contacted with hot water, do not allow cement to be directly heated.
2. the step is divided into following steps：
(2.1) prefabricated case beam template is made, and the concrete and its template mixed by heating are passed through into gunnysack covering and heat insulating
Transfer canal is sent to prefabricated place；
(2.2) arranged altogether in 12 temperature measuring points, prefabricated case beam reserving hole channel on each hole case of prefabricated case beam template
Set four temperature measuring points, two coxostermums respectively set three temperature measuring points, respectively it is each set one web length a quarter, two
/ mono- and 3/4ths position, plays termination and respectively sets one；
(2.3) being cast in 6 hours per a piece of beam is completed, and steam curing shed cover is covered in time after casting complete.
4. the step is divided into following steps：
(4.1) one layer of geotextiles are laid on the prefabricated case beam surface after shaping is poured；
(4.2) steam curing shed cover is hung to design attitude, immediately covering and heat insulating awning cover, stands about 4 hours and concrete final set
Afterwards, holding canopy temperature is not less than between 5 DEG C, and quiet stopping time small not less than 4 during boiler starts steam supply heating progress steam curing, standing
When.
5. the step is divided into following steps：
(5.1) steam temperature rise period concrete initial set, after withdrawing rod is all extracted, canopy cover termination canvas is left behind covering beam
Body is closed, and starts to warm up maintenance, and programming rate is controlled within 10 DEG C/h；
(5.2) boiler combustion to steam supply time is tested before heating up, it is ensured that steam supply is timely, while reply case before heating
Bottom of chamber and the watering of pedestal ground, keep wet in top surface of the beam and box beam；
(5.3) thermostatic curing is used after steam heating, vapor (steam) temperature is that surface temperature of concrete is no more than in canopy during constant temperature
45 DEG C, beam body core concrete temperature is no more than 60 DEG C, and the thermostatic curing time requires according to strength of mould stripping, concrete mix feelings
Condition and environmental condition determine that concrete strength is 60% by testing, and through surveying surface strength, conversion obtains Concrete Design age
Phase intensity, control reaches the constant temperature time needed for intensity 60%.
The step 6. middle cooling control it is main according to the step, 5. middle box beam concrete intensity processed reaches that 60% is defined,
Cooling rate is controlled in 10 DEG C/below h, is removed after lagging facility, beam body concrete core and top layer, top layer and environment temperature it
Difference cannot be greater than 15 DEG C.
The beneficial effects of the present invention are：
(1) carry out heating to aggregate using steam to mix and stir, pour after shaping using steam curing greenhouse to prefabricated
Box-beam structure carries out constant temperature, the maintenance of constant humidity, both ensure that being normally carried out for cold season in winter prefabricated case beam concrete construction,
The intensity of concrete is in turn ensure that, standard curing condition has been basically reached；
(2) temperature control being related to is by the way of pre-buried temperature sensor inside and outside component, and simple to operate, temperature control is accurately clever
Quick, construction technology is more scientific；
(3) according to the temperature situation in prefabricated box -beam area, especially for the construction under the conditions of cold winter, supported using steam
Protect greenhouse and combine temperature controller control temperature and humidity that later stage software view is developed.
Brief description of the drawings
Fig. 1 is the construction process figure of the present invention.
Embodiment
Be described further below technical scheme, but claimed scope be not limited to it is described.
As shown in figure 1, a kind of cold district winter prefabricated case beam concrete construction method, comprises the following steps：
1. preparation is poured：Prepare equipment and material and detect, make a record；
2. make template and pour：Prefabricated case beam template is made, prefabricated place is transported to, and concrete is carried out to template and pour
Build, while pre-buried temperature sensor；
3. quality inspection is carried out：After the completion of to step 2. in prefabricated case beam carry out quality inspection and eliminate below standard fractional error；
4. maintenance prepares：To step 3. in prefabricated case beam carry out steam curing canopy in conserve prepare；
5. conserved：Steam heating, the method for thermostatic curing is taken to conserve prefabricated case beam；
6. natural curing：After concrete strength reaches 60%, prefabricated case beam is cooled, form removal, into supporting naturally
The shield stage.
1. the step is divided into following steps：
(1.1) steam boiler and pipeline are detected, it is ensured that steam boiler send vapour normally to run and not damage；
(1.2) according to mix calculation, temperature measuring is carried out to sandstone aggregate, the aggregate is by sand, stone, cement and fine coal
Ash composition, when aggregate temperature is -3 DEG C, water temperature reaches that 50 DEG C can ensure concrete molding temperature more than 10 DEG C, actual water temperature root
Calculated according to live aggregate temperature and environment temperature, and water heating-up temperature is not higher than 80 DEG C；
(1.3) concrete mixing water is heated up using steam-heated method, steam is conveyed by steam boiler
Into live cistern, raise water temperature in cistern, while parcel heat-barrier material on the outside of cistern, prevents heat loss.
Wherein, the aggregate use the agitating mode of steam heating water mixing concrete for：First Jiang Shui, sand, stone are mixed thoroughly, then
Added water mud, flyash and additive, it is to avoid cement is directly contacted with hot water, does not allow cement to be directly heated.
2. the step is divided into following steps：
(2.1) prefabricated case beam template is made, and the concrete and its template mixed by heating are passed through into gunnysack covering and heat insulating
Transfer canal is sent to prefabricated place；
(2.2) 12 temperature measuring points are arranged altogether on each hole case of prefabricated case beam template, wherein four long-tail temperature controllers
Insert in prefabricated case beam reserving hole channel, survey concrete internal temperature；Eight survey vapor (steam) temperatures, two coxostermums respectively arrange three thermometrics
Point, the position of a quarter, 1/2nd and 3/4ths in web length respectively sets one, plays each one of termination；
(2.3) being cast in 6 hours per a piece of beam is completed, and steam curing shed cover is covered in time after casting complete.
4. the step is divided into following steps：
(4.1) one layer of geotextiles are laid on the prefabricated case beam surface after shaping is poured (after the completion of receipts face)；
(4.2) steam curing shed cover is hung to design attitude, immediately covering and heat insulating awning cover, stands about 4 hours and concrete final set
Afterwards, holding canopy temperature is not less than between 5 DEG C, and quiet stopping time small not less than 4 during boiler starts steam supply heating progress steam curing, standing
When.
5. the step is divided into following steps：
(5.1) steam temperature rise period concrete initial set, after withdrawing rod is all extracted, canopy cover termination canvas is left behind covering beam
Body is closed, and starts to warm up maintenance, and programming rate is controlled within 10 DEG C/h；
(5.2) boiler combustion to steam supply time is tested before heating up, it is ensured that steam supply is timely, while reply case before heating
Bottom of chamber and the watering of pedestal ground, keep wet in top surface of the beam and box beam；
(5.3) thermostatic curing is used after steam heating, vapor (steam) temperature is that surface temperature of concrete is no more than in canopy during constant temperature
45 DEG C, beam body core concrete temperature is no more than 60 DEG C, and the thermostatic curing time requires according to strength of mould stripping, concrete mix feelings
Condition and environmental condition determine that concrete strength is 60% by testing, and through surveying surface strength, conversion obtains Concrete Design age
Phase intensity, control reaches the constant temperature time needed for intensity 60%.
The step 6. middle cooling control it is main according to the step, 5. middle box beam concrete intensity processed reaches that 60% is defined,
Cooling rate is controlled in 10 DEG C/below h, is removed after lagging facility, beam body concrete core and top layer, top layer and environment temperature it
Difference cannot be greater than 15 DEG C.
Embodiment
As described above, according to the temperature situation in prefabricated box -beam area, especially for the construction under the conditions of cold winter, using
Steam curing greenhouse combination temperature controller A.T.C and humidity, have formulated one set of construction technique, and construction procedure is as follows：
1. prefabricated box -beam pours the preparatory stage, main detecting including steam boiler and pipeline, the temperature of live sandstone aggregate
The preparations such as degree is determined, steam boiler send vapour, the heating of concrete mixing water：
(1.1) local weather forecast is collected, temperature t1 when recording and determining construction avoids pouring during low temperature mixed as far as possible
Solidifying soil；The time of pouring is tried one's best the daytime for selecting temperature higher, and raw material such as sand material stockyard is covered with shed in addition, to take shelter from rain
Snow, determines the initial temperature t2 of aggregate before mixing and stirring；
(1.2) inspection of steam boiler and pipeline, it is ensured that steam heating rate controls unimpeded with conveyance conduit；
(1.3) according to mix calculation, when aggregate (including sand, stone, cement, flyash) temperature is -3 DEG C, water temperature reaches
Concrete molding temperature can be ensured more than 10 DEG C to 50 DEG C, actual water temperature should enter according to live aggregate temperature and environment temperature
Row is calculated, and water heating-up temperature should not be higher than 80 DEG C；
(1.4) concrete mixing water uses steam-heated method, i.e., convey steam by steam boiler stores to scene
In pond, raise water temperature in cistern, while parcel heat-barrier material on the outside of cistern, prevents heat loss, using heating water temperature
Aggregate release sequence is as follows during mixing concrete：First water and sandstone are mixed thoroughly, mud, flyash and additive, Yi Mianshui is added water
Mud is directly contacted with hot water, ensures not allow cement to be directly heated in construction.
2. prefabricated case beam is poured in a template, while pre-buried temperature sensor：
(2.1) concrete mixed and stirred by heating, prefabricated place is sent to by gunnysack covering and heat insulating transfer canal, is accelerated
Speed of perfusion, a piece of beam as far as possible in 6 hours after casting complete, casting complete in time cover steam curing shed cover in case heat scatter and disappear and
Adverse effect of the wind speed to concrete；
(2.2) the pre-buried temperature sensor in box beam is needed to understand at any time according to design in box beam concrete casting process
Inside box beam, surface and environment temperature to control optimal striking time, necessary Insulation is taken when internal-external temperature difference is too big；
(2.3) it is in good time as needed to arrange special messenger's thermometric, two classes of relay systems are carried out, observation is once, every small per half an hour
When lifting temperature be no more than 10 DEG C, and temperature difference between inside and outside concrete be no more than 15 DEG C；By in steam control valve Reasonable adjustment canopy
Heating rate, when finding that temperature difference between inside and outside concrete or temperature rate occur abnormal, reports, analyzes reason, take and arrange immediately
Apply, and carry out thermograph.
3. maintenance prepares in steam curing canopy：
(3.1) after beam body concrete form (after the completion of receipts face), spread a layer of clay work cloth, then will in concrete surface
Steam curing shed cover is hung to design attitude, immediately covering and heat insulating awning cover, stands after about 4h and concrete final set, and boiler starts steam supply heating
Carry out steam curing；
(3.2) keep canopy temperature to be not less than between 5 DEG C, and quiet stopping time during standing to be not less than 4 hours.
4. steam heats up, thermostatic curing：
(4.1) boiler combustion to steam supply time should be tested before heating up, it is ensured that steam supply is timely；Tackled heat up simultaneously before
Bottom of chamber and the watering of pedestal ground, keep wet in box beam top surface and box beam；
(4.2) steam temperature rise period concrete initial set, after withdrawing rod is all extracted, canopy cover termination canvas is left behind covering beam
Body is closed, and then starts to warm up maintenance, and programming rate is controlled within 10 DEG C/h；
(4.3) vapor (steam) temperature is that surface temperature of concrete is no more than 45 DEG C, beam body core concrete temperature in canopy during constant temperature
No more than 60 DEG C, the thermostatic curing time requires according to strength of mould stripping, concrete mix situation and environmental condition etc. pass through examination
Determination is tested, concrete strength can measure surface strength by instruments such as reisilometers, and then conversion obtains Concrete Design age
Intensity, controls to reach the constant temperature time needed for design strength 60% with this.
5. cooling, form removal after concrete strength reaches 60%, into the natural curing stage：
(5.1) cooling control mainly reaches that the 60% of design strength is defined according to box beam concrete strength in the step 4,
Cooling rate is controlled in 10 DEG C/below h.Remove after lagging facility, beam body concrete core and top layer, top layer and environment temperature it
Difference cannot be greater than 15 DEG C；
(5.2) after the steam-cured end of beam body, i.e., into natural curing, the time (should not now remove and be tackled after canopy cover less than 7 days
Canopy cover is checked, if any breakage, should be repaired in time), beam body surface covering geotextiles (plus film) watering is supported during natural curing
Shield；
(5.2.1) beam body maintenance water is identical with mixing beam body concrete water, the temperature between water temperature and surface concrete
Difference cannot be greater than 15 DEG C；
(5.2.2) sprinkles water number of times to keep concrete surface moisture state as degree, and generally, daytime is with 1~2h mono-
Secondary, evening 4h is once；
(5.2.3) will carry out watering to the concrete sample conserved with beam and support while watering maintenance is carried out to beam body
Shield, makes test specimen be grown simultaneously with beam body concrete strength；
(5.2.4), when ambient air temperature is less than+5 DEG C, beam body surface should spray sealing compound, take heat and moisture preserving measure, prohibit
Only concrete is sprinkled water.
Claims (8)
1. a kind of cold district winter prefabricated case beam concrete construction method, it is characterised in that：Comprise the following steps：
1. preparation is poured：Prepare equipment and material and detect, make a record；
2. make template and pour：Prefabricated case beam template is made, prefabricated place is transported to, and concreting is carried out to template,
While pre-buried temperature sensor；
3. quality inspection is carried out：After the completion of to step 2. in prefabricated case beam carry out quality inspection and eliminate below standard fractional error；
4. maintenance prepares：To step 3. in prefabricated case beam carry out steam curing canopy in conserve prepare；
5. conserved：Steam heating, the method for thermostatic curing is taken to conserve prefabricated case beam；
6. natural curing：After concrete strength is up to standard, prefabricated case beam is cooled, form removal, into the natural curing stage.
2. cold district winter prefabricated case beam concrete construction method as claimed in claim 1, it is characterised in that：The step
1. it is divided into following steps：
(1.1) steam boiler and pipeline are detected, it is ensured that steam boiler send vapour normally to run and not damage；
(1.2) according to mix calculation, temperature measuring is carried out to sandstone aggregate, when aggregate temperature is -3 DEG C, water temperature reaches 50 DEG C
Concrete molding temperature can be ensured more than 10 DEG C, actual water temperature is calculated according to live aggregate temperature and environment temperature, and
Water heating-up temperature is not higher than 80 DEG C；
(1.3) concrete mixing water is heated up using steam-heated method, steam is conveyed to now by steam boiler
In the cistern of field, raise water temperature in cistern, while parcel heat-barrier material on the outside of cistern, prevents heat loss.
3. cold district winter prefabricated case beam concrete construction method as claimed in claim 2, it is characterised in that：The aggregate
It is made up of sand, stone, cement and flyash.
4. cold district winter prefabricated case beam concrete construction method as claimed in claim 2, it is characterised in that：The aggregate
Use the agitating mode of steam heating water mixing concrete for：First Jiang Shui, sand, stone are mixed thoroughly, add water mud, flyash and additional
Agent, it is to avoid cement is directly contacted with hot water, does not allow cement to be directly heated.
5. cold district winter prefabricated case beam concrete construction method as claimed in claim 1, it is characterised in that：The step
2. it is divided into following steps：
(2.1) prefabricated case beam template is made, and the concrete and its template mixed by heating are transmitted by gunnysack covering and heat insulating
Pipeline is sent to prefabricated place；
(2.2) arrange in 12 temperature measuring points, prefabricated case beam reserving hole channel and set altogether on each hole case of prefabricated case beam template
Four temperature measuring points, two coxostermums respectively set three temperature measuring points, respectively it is each set one web length a quarter, two/
One and 3/4ths position, plays termination and respectively sets one；
(2.3) being cast in 6 hours per a piece of beam is completed, and steam curing shed cover is covered in time after casting complete.
6. cold district winter prefabricated case beam concrete construction method as claimed in claim 1, it is characterised in that：The step
4. it is divided into following steps：
(4.1) one layer of geotextiles are laid on the prefabricated case beam surface after shaping is poured；
(4.2) steam curing shed cover is hung to design attitude, immediately covering and heat insulating awning cover, stands about 4 hours and after concrete final set, pot
Stove starts to keep canopy temperature to be not less than between 5 DEG C, and quiet stopping time not less than 4 hours during steam supply heating carries out steam curing, standing.
7. cold district winter prefabricated case beam concrete construction method as claimed in claim 1, it is characterised in that：The step
5. it is divided into following steps：
(5.1) steam temperature rise period concrete initial set, after withdrawing rod is all extracted, canopy cover termination canvas is left behind and covers beam body envelope
Close, start to warm up maintenance, programming rate is controlled within 10 DEG C/h；
(5.2) boiler combustion to steam supply time is tested before heating up, it is ensured that steam supply is timely, while reply box beam top before heating
Bottom of chamber and the watering of pedestal ground, keep wet in face and box beam；
(5.3) thermostatic curing is used after steam heating, vapor (steam) temperature is that surface temperature of concrete is no more than 45 DEG C in canopy during constant temperature,
Beam body core concrete temperature is no more than 60 DEG C, the thermostatic curing time requires according to strength of mould stripping, concrete mix situation with
And environmental condition determines that concrete strength is 60% by testing, through surveying surface strength, it is strong that conversion obtains Concrete Design age
Degree, control reaches the constant temperature time needed for intensity 60%.
8. cold district winter prefabricated case beam concrete construction method as claimed in claim 1, it is characterised in that：The step
6. mainly according to the step, 5. middle box beam concrete intensity processed reaches that 60% is defined for middle cooling control, and cooling rate is controlled 10
DEG C/below h, remove after lagging facility, beam body concrete core and the difference on top layer, top layer and environment temperature cannot be greater than 15 DEG C.
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| CN201710509765.1A CN107160551A (en) | 2017-06-28 | 2017-06-28 | A kind of cold district winter prefabricated case beam concrete construction method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107877681A (en) * | 2017-10-30 | 2018-04-06 | 山东高速轨道设备材料有限公司 | A kind of Maintenance in Winter method of concrete component |
| CN108396858A (en) * | 2018-03-19 | 2018-08-14 | 浙江红欣园林艺术有限公司 | A kind of concrete construction method of combination BIM |
| CN108908673A (en) * | 2018-09-12 | 2018-11-30 | 云南建投第十建设有限公司 | High and cold low pressure area Precast T-Beam steam press maintenance method |
| CN108978472A (en) * | 2018-07-05 | 2018-12-11 | 中交二航局第二工程有限公司 | Maintenance process suitable for the Hanging Basket cantilever box beam winter construction of high wind area |
| CN109079972A (en) * | 2018-08-13 | 2018-12-25 | 中铁三局集团有限公司 | A kind of method of entire winter prefabricated thermal insulation maintenance |
| CN109610894A (en) * | 2018-12-10 | 2019-04-12 | 中交公局桥隧工程有限公司 | A kind of blending station thermal insulation construction technique |
| CN111098399A (en) * | 2019-11-15 | 2020-05-05 | 南京港港务工程有限公司 | Concrete interlocking block curing method |
| CN111719434A (en) * | 2020-07-10 | 2020-09-29 | 张飞 | Construction method of box girder template for municipal road and bridge building |
| CN111719433A (en) * | 2020-07-10 | 2020-09-29 | 张飞 | Box girder template for municipal administration road and bridge construction |
| CN112062601A (en) * | 2020-08-20 | 2020-12-11 | 浙江纯青节能科技有限公司 | Steam curing process for concrete prefabricated part |
| CN112248203A (en) * | 2020-09-16 | 2021-01-22 | 绍兴中亚工贸园有限公司 | Winter maintenance process for pipe sheet |
| CN113001772A (en) * | 2021-02-22 | 2021-06-22 | 中电建十一局工程有限公司 | Winter heat preservation construction method for concrete precast beam |
| CN113402242A (en) * | 2021-06-17 | 2021-09-17 | 青岛理工大学 | Steam-cured alkali-activated slag concrete and preparation method thereof |
| CN113878699A (en) * | 2021-09-23 | 2022-01-04 | 中国一冶集团有限公司 | Precast beam concrete curing method based on BIM |
| CN114474338A (en) * | 2022-01-05 | 2022-05-13 | 中铁八局集团第七工程有限公司 | Prefabrication production method for railway T beam in high-cold high-altitude area |
| CN114991485A (en) * | 2022-02-22 | 2022-09-02 | 山东高速工程建设集团有限公司 | Intelligent prestress tensioning remote control method and system for precast beam slab |
| CN115030049A (en) * | 2022-07-05 | 2022-09-09 | 中国十七冶集团有限公司 | Construction method for intelligent maintenance of cast-in-place box girder in winter |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107877681A (en) * | 2017-10-30 | 2018-04-06 | 山东高速轨道设备材料有限公司 | A kind of Maintenance in Winter method of concrete component |
| CN108396858A (en) * | 2018-03-19 | 2018-08-14 | 浙江红欣园林艺术有限公司 | A kind of concrete construction method of combination BIM |
| CN108978472A (en) * | 2018-07-05 | 2018-12-11 | 中交二航局第二工程有限公司 | Maintenance process suitable for the Hanging Basket cantilever box beam winter construction of high wind area |
| CN109079972A (en) * | 2018-08-13 | 2018-12-25 | 中铁三局集团有限公司 | A kind of method of entire winter prefabricated thermal insulation maintenance |
| CN108908673A (en) * | 2018-09-12 | 2018-11-30 | 云南建投第十建设有限公司 | High and cold low pressure area Precast T-Beam steam press maintenance method |
| CN109610894A (en) * | 2018-12-10 | 2019-04-12 | 中交公局桥隧工程有限公司 | A kind of blending station thermal insulation construction technique |
| CN111098399A (en) * | 2019-11-15 | 2020-05-05 | 南京港港务工程有限公司 | Concrete interlocking block curing method |
| CN111719433A (en) * | 2020-07-10 | 2020-09-29 | 张飞 | Box girder template for municipal administration road and bridge construction |
| CN111719434A (en) * | 2020-07-10 | 2020-09-29 | 张飞 | Construction method of box girder template for municipal road and bridge building |
| CN112062601A (en) * | 2020-08-20 | 2020-12-11 | 浙江纯青节能科技有限公司 | Steam curing process for concrete prefabricated part |
| CN112248203A (en) * | 2020-09-16 | 2021-01-22 | 绍兴中亚工贸园有限公司 | Winter maintenance process for pipe sheet |
| CN113001772A (en) * | 2021-02-22 | 2021-06-22 | 中电建十一局工程有限公司 | Winter heat preservation construction method for concrete precast beam |
| CN113402242A (en) * | 2021-06-17 | 2021-09-17 | 青岛理工大学 | Steam-cured alkali-activated slag concrete and preparation method thereof |
| CN113878699A (en) * | 2021-09-23 | 2022-01-04 | 中国一冶集团有限公司 | Precast beam concrete curing method based on BIM |
| CN114474338A (en) * | 2022-01-05 | 2022-05-13 | 中铁八局集团第七工程有限公司 | Prefabrication production method for railway T beam in high-cold high-altitude area |
| CN114991485A (en) * | 2022-02-22 | 2022-09-02 | 山东高速工程建设集团有限公司 | Intelligent prestress tensioning remote control method and system for precast beam slab |
| CN115030049A (en) * | 2022-07-05 | 2022-09-09 | 中国十七冶集团有限公司 | Construction method for intelligent maintenance of cast-in-place box girder in winter |
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