CN102345388A - Construction method for heat-preservation maintenance of shell sliding-formwork concrete under low-temperature condition - Google Patents
Construction method for heat-preservation maintenance of shell sliding-formwork concrete under low-temperature condition Download PDFInfo
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- CN102345388A CN102345388A CN2011101938044A CN201110193804A CN102345388A CN 102345388 A CN102345388 A CN 102345388A CN 2011101938044 A CN2011101938044 A CN 2011101938044A CN 201110193804 A CN201110193804 A CN 201110193804A CN 102345388 A CN102345388 A CN 102345388A
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Abstract
The invention discloses a construction method for heat-preservation maintenance of shell sliding-formwork concrete under a low-temperature condition. The construction method is characterized in that a piece of awning cloth and a heat-preservation quilt are used for sealing outside a scaffold hanging basket under inner and outer operation platforms after a sliding-formwork is completely assembled, electric air heaters are uniformly arranged on a scaffold hanging basket operating platform, and the electric air heaters are started and an electric greenhouse method is adopted to perform heat-preservation maintenance on the shell concrete. The construction method comprises following construction steps: 1) modifying a sliding-formwork die; 2) arranging circuits and electric heaters; 3) carrying out construction of heat-preservation material; 4) arranging a fireproof apparatus; 5) testing a temperature with an empty formwork; 6) lifting the sliding-formwork for the first time and testing the temperature; 7) performing the heat-preservation construction under the scaffold hanging basket operating platform after lifting the sliding-formwork for 2 meters; and 8) performing additional maintenance construction on formed concrete. The construction method provided by the invention can be used for realizing the continuous construction of the shell sliding-formwork concrete at low temperature not lower than -15 DEG C, ensuring the construction quality of concrete, quickening a construction process, and lowering the construction cost. Besides, the construction method is safe and reliable.
Description
Technical field
The present invention relates to the job practices of concrete curing, is a kind of job practices of cryogenic conditions lower shell form concrete insulated curing specifically, is applied to the form concrete construction field.
Background technology
At present, the insulated curing job practices that concrete adopts under cryogenic conditions has: regenerative process maintenance, the maintenance of brooder method, electrothermal way maintenance, far infrared rays maintenance etc., and these insulated curing methods can't be used for the construction of cylindrical shell form concrete insulated curing.
Summary of the invention
The objective of the invention is the above-mentioned shortcoming to the prior art existence, a kind of job practices of cryogenic conditions lower shell form concrete insulated curing is provided, realization cylindrical shell form concrete is constructed continuously and is guaranteed concrete construction quality under cryogenic conditions.
Job practices provided by the invention realizes like this: the technological characteristics of construction of utilizing sliding formwork; After the sliding formwork assembling is accomplished; Utilize the scaffold basket that hangs under the inside and outside operating platform of sliding formwork to make bracing frame; Under inside and outside operating platform hang scaffold basket external application tarpaulin and heat-preservation cotton is closed; Hanging the even electric warm-air machine of arranging on the scaffold basket job platform; Start electric warm-air machine, adopt the electric heating tent method that the cylindrical shell concrete is carried out insulated curing.
Job practices provided by the invention, it is to be undertaken by following construction sequence:
1, sliding formwork mould repacking
Widen the inside and outside scaffold basket job platform that hangs.Change the extra snow load of being brought according to needed material weight of heat tracing and atmospheric temperature, between sliding formwork mould door frame, be welded to each other, prevent to occur in the slip forming sliding formwork die shift with the reinforcing channel-section steel.
2, circuit and electric heater are arranged
Need be with certificate at the inside and outside electric warm-air machine of arranging some on the scaffold basket job platform that hangs, the layout of electric warm-air machine is wanted evenly, and the direction of blowing tilts for 45 degree that make progress.When arranging the leader cable line, calculate the required magnitude of current in advance, to reserve the electric warm-air machine power interface of extra increase simultaneously in advance.
3, the construction of heat insulating material
At first arrange the heat-preservation cotton quilt that the sliding formwork template is outer; And then outer safety net, heat-preservation cotton quilt, the tarpaulin that hangs on the scaffold basket of layout; Safety net on the interior hung scaffold basket, heat-preservation cotton by, tarpaulin and inside and outside hang safety net, heat-preservation cotton quilt, the tarpaulin scaffold basket job platform under, arrange insulation greenhouse cloth in the storehouse at last.When arranging heat insulating material, at first the construction safety net then at the plug-in tarpaulin of safety net, is hung the heat-preservation cotton quilt at last in safety net.Tarpaulin is fixing to be wanted firmly, and the connection between every tarpaulin is solid, prevents to be blown off in the slip forming.Arrange that heat insulating material is tight, reach the effect of sealing.
4, fire-proof apparatus is arranged
Arrange fire extinguisher according to field condition at inside and outside operating platform and inside and outside hanging on the scaffold basket job platform.Fire prevention is a most important preventive works in this work progress, and all heat insulating materials are inflammable thing, during sliding formwork, not only will prepare enough fire distinguishers, also wants special messenger's twenty four hours follow-up supervise and examine.
5, empty mould examination temperature
All insulation preparation is started all electric warm-air machines after accomplishing before concreting, try the temperature test.When the minimum temperature in hanging scaffold basket job platform reaches 10 degrees centigrade, possesses the concreting condition.
6, sliding formwork promotes the examination temperature for the first time
Situation according to diel construction in first day; Affirmation variation of temperature in the scaffold basket job platform in lifting process when the lowest temperature in the scaffold basket job platform is lower than 10 degrees centigrade, increases electric warm-air machine; After reaching the condition of normal construction, slding form operation continuously.
7, sliding formwork hangs the heat preservation construction under the scaffold basket job platform after promoting 2m
After sliding formwork promotes, need be incubated hanging the concrete that exposes under the scaffold basket job platform, therefore after sliding formwork promotes 2m, immediately hang hang under the scaffold basket job platform heat-preservation cotton by and tarpaulin.When construction, at first hang the heat-preservation cotton quilt, outside the heat-preservation cotton quilt, hang tarpaulin more then.Heat-preservation cotton quilt and the tarpaulin of hanging are fixing wants firm, reliable, prevents in the slding form operation process, to drop, otherwise can't repair again.
8, the additional maintenance construction of moulding concrete
According to concrete performance requirement, the concrete surface after the depanning will be brushed specialty curing fluid capable in twice winter, to guarantee quality of concrete.
Sliding formwork hoisting velocity diel under the low temperature will be controlled at about 2-2.5m, and slding form operation hoisting depth every day is decided with the intensity after the concrete heat-insulating maintenance after the depanning, and lifting can not be too fast.According to the technological characteristics of construction of sliding formwork, operating platform to the distance of hanging scaffold basket job platform is about 2.5m, and the concrete of depanning just obtains insulation between this 2.5m, and the height that promotes with every day meets.Hang the scaffold hanging basket and make to hang under the platform high tarpaulin of 2-4m and cotton-wadded quilt, be used for the concrete of insulated curing depanning the previous day.So just can realize the concrete after the depanning was carried out comprehensive insulated curing in 48 hours.
In the slding form operation process, arrange the special messenger to measure inside and outside holding temperature of hanging in the scaffold basket job platform, the variation of holding temperature is held in support at any time and the variation of atmospheric temperature comes the timely measure of adjusting insulation.When atmospheric temperature is below-15 degrees centigrade the time, do not answer slding form operation.
Compared with prior art, advantage of the present invention is: can be not less than and realizing under-15 degrees centigrade the cryogenic conditions that the cylindrical shell form concrete constructs continuously, and guaranteeing concrete construction quality, accelerating construction speed, not only safety but also reliable also reduced construction cost.
Description of drawings
Fig. 1 arranges sketch map for insulation.
Among Fig. 1: 1; Hang heat-preservation cotton quilt and the tarpaulin 2 hung under the scaffold basket job platform; Hang scaffold basket job platform 3 outward; Fire extinguisher 4; Hang the warm-air drier 5 on the scaffold basket job platform outward; Hang the safety net on the scaffold basket outward; The heat-preservation cotton quilt; Tarpaulin 6; Fire extinguisher 7; Outer operating platform 8; Reinforce channel-section steel 9; Door frame 10; Interior operating platform 11; Fire extinguisher 12; Insulation greenhouse cloth 13 in the storehouse; Safety net on the interior hung scaffold basket; The heat-preservation cotton quilt; Tarpaulin 14; Heat-preservation cotton outside the sliding formwork template is by 15; Fire extinguisher 16; Warm-air drier 17 on the interior hung scaffold basket job platform; Interior hung scaffold basket job platform 18; Inside and outside hang the safety net under the scaffold basket job platform; The heat-preservation cotton quilt; Tarpaulin.
The specific embodiment
For further describing the present invention, do further to describe below in conjunction with a kind of job practices of 1 couple of the present invention of accompanying drawing at cryogenic conditions lower shell form concrete insulated curing.
The first step, the repacking of sliding formwork mould.
After accomplishing, the sliding formwork assembling widens the inside and outside scaffold basket job platform (17,2) that hangs.Change the extra snow load of being brought according to needed material weight of heat tracing and atmospheric temperature, between sliding formwork mould door frame (9), be welded to each other, prevent to occur in the slip forming sliding formwork die shift with reinforcing channel-section steel (8).
In second step, circuit and electric heater are arranged.
Need go up the electric warm-air machine (4,16) of arranging some at the inside and outside scaffold basket job platform (17,2) that hangs with certificate, the layout of electric warm-air machine is wanted evenly, and the direction of blowing is that upwards 45 degree tilt.When arranging the leader cable line, calculate the required magnitude of current in advance, to reserve the electric warm-air machine power interface of extra increase simultaneously in advance.
The 3rd step, the construction of heat insulating material.
Arrange that at first the outer heat-preservation cotton of sliding formwork template is by (14); And then outer safety net, heat-preservation cotton quilt, the tarpaulin (5) that hangs on the scaffold basket of layout; Safety net on the interior hung scaffold basket, heat-preservation cotton quilt, tarpaulin (13) and inside and outside safety net, heat-preservation cotton quilt, the tarpaulin (18) that hangs under the scaffold basket job platform are arranged insulation greenhouse cloth in the storehouse (12) at last.When arranging heat insulating material, at first the construction safety net then at the plug-in tarpaulin of safety net, is hung the heat-preservation cotton quilt at last in safety net.Tarpaulin is fixing to be wanted firmly, and the connection between every tarpaulin is solid, prevents to be blown off in the slip forming.Arrange that heat insulating material is tight, reach the effect of sealing.
In the 4th step, fire-proof apparatus is arranged.
Go up layout fire extinguisher (3,6,11,15) according to field condition at inside and outside operating platform (10,7) and the inside and outside scaffold basket job platform (17,2) that hangs.Fire prevention is a most important preventive works in this work progress, and all heat insulating materials are inflammable thing, during sliding formwork, not only will prepare enough fire distinguishers, also wants special messenger's twenty four hours follow-up supervise and examine.
The 5th step, empty mould examination temperature.
All insulation preparation is started all electric warm-air machines after accomplishing before concreting, try the temperature test.When the minimum temperature in hanging scaffold basket job platform reaches 10 degrees centigrade, possesses the concreting condition.
In the 6th step, sliding formwork promotes the examination temperature for the first time.
Situation according to diel construction in first day; Affirmation variation of temperature in the scaffold basket job platform in lifting process when the lowest temperature in the scaffold basket job platform is lower than 10 degrees centigrade, increases electric warm-air machine; After reaching the condition of normal construction, slding form operation continuously.
In the 7th step, sliding formwork hangs the heat preservation construction under the scaffold basket job platform after promoting 2m.
After sliding formwork promotes, need be incubated hanging the concrete that exposes under the scaffold basket job platform, therefore after sliding formwork promotes 2m, immediately hang hang under the scaffold basket job platform heat-preservation cotton by and tarpaulin (1).When construction, at first hang the heat-preservation cotton quilt, outside the heat-preservation cotton quilt, hang tarpaulin more then.Heat-preservation cotton quilt and the tarpaulin of hanging are fixing wants firm, reliable, prevents in the slding form operation process, to drop, otherwise can't repair again.
In the 8th step, the moulding concrete adds maintenance construction.
According to concrete performance requirement, the concrete surface after the depanning will be brushed specialty curing fluid capable in twice winter, to guarantee quality of concrete.
In certain construction works, carry out the cylindrical shell slding form operation during winter in 2008, accomplished 2 raw material silo bottom of the reservior plates with lower shell concrete and the concrete slding form operation of 2 whole cylindrical shells of cement bunker with the present invention.Concrete all meets the design and construction code requirement through the test report of field sampling and test cube in the same condition.
Claims (3)
1. the job practices of a cryogenic conditions lower shell form concrete insulated curing; It is characterized in that: after the sliding formwork assembling is accomplished; Under inside and outside operating platform hang scaffold basket external application tarpaulin and heat-preservation cotton is closed; Hanging the even electric warm-air machine of arranging on the scaffold basket job platform; Start electric warm-air machine; Adopt the electric heating tent method that the cylindrical shell concrete is carried out insulated curing, undertaken by following construction sequence:
(1). sliding formwork mould repacking: comprise and widen the inside and outside scaffold basket job platform that hangs, between sliding formwork mould door frame, be welded to each other with the reinforcing channel-section steel;
Circuit and electric heater are arranged: be included in the inside and outside electric warm-air machine of arranging some on the scaffold basket job platform that hangs, when arranging the leader cable line, calculate the required magnitude of current in advance, reserve the extra electric warm-air machine power interface that increases;
The construction of heat insulating material: comprise the heat-preservation cotton quilt of arranging that at first the sliding formwork template is outer; And then outer safety net, heat-preservation cotton quilt, the tarpaulin that hangs on the scaffold basket of layout; Safety net on the interior hung scaffold basket, heat-preservation cotton by, tarpaulin and inside and outside hang safety net, heat-preservation cotton quilt, the tarpaulin scaffold basket job platform under, arrange insulation greenhouse cloth in the storehouse at last;
(4). fire-proof apparatus is arranged: be included in inside and outside operating platform and inside and outside hanging on the scaffold basket job platform arranged fire extinguisher;
(5). empty mould examination temperature: start all electric warm-air machines before comprising concreting, try the temperature test;
(6). for the first time sliding formwork promotes the examination temperature: comprise the situation according to diel construction in first day, confirm in lifting process variation of temperature in the scaffold basket job platform;
(7). sliding formwork hangs the heat preservation construction scaffold basket job platform under after promoting 2m: after comprising that sliding formwork promotes 2m, hang heat-preservation cotton quilt and tarpaulin under the scaffold basket job platform hanging immediately;
(8) the additional maintenance construction of moulding concrete: comprise concrete surface after the depanning to brush twice winter the specialty curing fluid capable.
2. the job practices of the described a kind of cryogenic conditions lower shell form concrete insulated curing of claim 1 is characterized in that: the layout of the electric warm-air machine described in the said construction sequence (2) is wanted evenly, and the direction of blowing tilts for 45 degree upwards; Safety net described in the said construction sequence (3), heat-preservation cotton quilt, tarpaulin, at first the construction safety net then at the plug-in tarpaulin of safety net, is hung the heat-preservation cotton quilt at last in safety net; Examination temperature test described in the said construction sequence (5) when the minimum temperature in hanging scaffold basket job platform reaches 10 degrees centigrade, possesses the concreting condition; Lifting examination temperature described in the said construction sequence (6) when the lowest temperature in the scaffold basket job platform is lower than 10 degrees centigrade, increases electric warm-air machine; Described in the said construction sequence (7) hang heat-preservation cotton by and tarpaulin, in when construction, at first hang the heat-preservation cotton quilt, then heat-preservation cotton by outside hang tarpaulin again.
3. the job practices of the described a kind of cryogenic conditions lower shell form concrete insulated curing of claim 1 is characterized in that: when atmospheric temperature for below-15 degrees centigrade the time, do not answer slding form operation.
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| CN2011101938044A CN102345388A (en) | 2011-07-12 | 2011-07-12 | Construction method for heat-preservation maintenance of shell sliding-formwork concrete under low-temperature condition |
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| CN2011101938044A CN102345388A (en) | 2011-07-12 | 2011-07-12 | Construction method for heat-preservation maintenance of shell sliding-formwork concrete under low-temperature condition |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105735481A (en) * | 2016-03-01 | 2016-07-06 | 中国建筑第八工程局有限公司 | High-rise building core tube jacking platform climbing and thermal insulating device and construction method thereof |
| CN108821793A (en) * | 2018-06-06 | 2018-11-16 | 扬州大学 | A kind of assembled architecture component cast-in-situ concrete linear node frequency electromagnetic waves curing means |
| CN109914805A (en) * | 2019-03-28 | 2019-06-21 | 上海宝冶集团有限公司 | A kind of low temperature sleeve grout construction method |
| CN113482259A (en) * | 2021-06-30 | 2021-10-08 | 上海宝冶集团有限公司 | Exterior wall stone-like paint spraying construction method in low-temperature environment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735481A (en) * | 2016-03-01 | 2016-07-06 | 中国建筑第八工程局有限公司 | High-rise building core tube jacking platform climbing and thermal insulating device and construction method thereof |
| CN105735481B (en) * | 2016-03-01 | 2017-10-13 | 中国建筑第八工程局有限公司 | Core tube of high-rise building lifting platform climbs attemperator and its construction method |
| CN108821793A (en) * | 2018-06-06 | 2018-11-16 | 扬州大学 | A kind of assembled architecture component cast-in-situ concrete linear node frequency electromagnetic waves curing means |
| CN108821793B (en) * | 2018-06-06 | 2021-06-25 | 扬州大学 | Assembly type building element cast-in-place concrete linear node high-frequency electromagnetic wave curing means |
| CN109914805A (en) * | 2019-03-28 | 2019-06-21 | 上海宝冶集团有限公司 | A kind of low temperature sleeve grout construction method |
| CN113482259A (en) * | 2021-06-30 | 2021-10-08 | 上海宝冶集团有限公司 | Exterior wall stone-like paint spraying construction method in low-temperature environment |
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Application publication date: 20120208 |