CN104085040A - Method for manufacturing prefabricated box girder - Google Patents
Method for manufacturing prefabricated box girder Download PDFInfo
- Publication number
- CN104085040A CN104085040A CN201410301514.0A CN201410301514A CN104085040A CN 104085040 A CN104085040 A CN 104085040A CN 201410301514 A CN201410301514 A CN 201410301514A CN 104085040 A CN104085040 A CN 104085040A
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- Prior art keywords
- case beam
- prefabricated case
- water
- box girder
- prefabricated
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- 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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
The invention relates to a method for manufacturing a prefabricated box girder. The method comprises the following steps that (1) the prefabricated box girder is cast in a formwork; (2) after concrete casting of the prefabricated box girder is finished, water-spray moisturizing is conducted on the surface of the prefabricated box girder; (3) after concrete of the prefabricated box girder reaches preliminary strength, the formwork of the prefabricated box girder is removed; (4) the surface of the prefabricated box girder is covered, and water-spray curing is conducted; (5) after a first period of time, a core mold of the prefabricated box girder is removed, the interior of the prefabricated box girder is blocked, and the prefabricated box girder is filled with water after a second period of time after blocking is conducted; (6) after a third period of time, blocking is removed, and the water in the prefabricated box girder is discharged. In the manufacturing process of the prefabricated box girder, the curing process that surface linen covering water-spray curing is combined with curing conducted by storing water in the prefabricated box girder is very similar to a standard curing process, and the strength of the concrete is fully developed.
Description
Technical field
The present invention relates to precast concrete manufacture method, particularly a kind of manufacture method of prefabricated case beam.
Background technology
Concrete early curing, main purpose is the temperature and humidity condition that keeps suitable, to reach the effect of two aspects, makes on the one hand concrete avoid the impact of unfavorable temperature, humidity variation, prevents harmful shrinkage and drying shrinkage.Make on the other hand cement aquation carry out smoothly, to reaching intensity and the cracking resistance index request of design.
The detection of strength grade of concrete, mechanical property, endurance quality etc., is all to carry out under unified standard curing condition, says in some sense, all a kind of performance indications of theoretical property at last.Standard curing makes the own intensity of concrete (non-concrete members intensity) obtain real embodiment, for concrete opposing load provides accurately effectively foundation, tool has very important significance, and can say, the requirement of curing condition and enforcement, reflected a national Building technology level.
The raising of concrete engineering construction level and perfect, is exactly to be close with the standard specimen operation of code requirement as far as possible, reduces the intensity difference distance of the two.From maintenance aspect, be that the curing condition of actual components is close with " component conservation " of regulation and stipulation as far as possible, real curing protects with standard curing and is close.Therefore, large or the high and dry weather conditions of temperature for some day and night temperatures, research prefabricated case beam maintaining process, makes its maintenance effect and is near the mark maintenance.
From affecting the factor analysis of prefabricated case beam maintenance quality, by improving maintaining process, reduce the impact of unfavorable factor as far as possible, to reaching the effect of standard curing:
(1) curing temperature: curing temperature has significant impact to the hydration rate of cement, curing temperature is high can increase initial stage hydration rate, and early age strength of concrete is also high.But early stage fast hydration can cause hyrate skewness, in Behavior of Hardened Cement Paste, form closely knit low weak area, affect late strength of concrete.In the situation that curing temperature is lower, because hydration rate is slow, hyrate has sufficient diffusion time, thereby hyrate is uniformly distributed in Behavior of Hardened Cement Paste, be conducive to the development of later strength, but early age strength of concrete is lower, easily destroys.
(2) maintain humidity: can the humidity of surrounding environment normally have remarkable impact to the hydration of cement: humidity is moderate, hydrated cementitious can carry out smoothly, and concrete intensity is attained full development.If humidity is inadequate, concrete is understood desiccation and is affected normally carrying out of cement aquation, even can cause and stop aquation, the serious concrete strength that reduces, meanwhile, because of aquation incomplete, xoncrete structure is loose, impervious poor, when serious, also can form desciccation crack, affect concrete durability.
(3) the maintenance temperature difference: facts have proved, the crack that concrete is common, great majority are surface cracks of different depth, and its main cause is that thermograde causes, and the temperature decrease of cold district also easily forms crack.Therefore, prevent concrete inside and outside temperature difference and concrete surface gradient, could effectively prevent concrete surface crack.
Maintaining process in the past, often only focuses on the maintenance of prefabricated case beam outside, has ignored the inner maintenance of prefabricated case beam.
In sum, provide a kind of prefabricated case beam maintenance process of the effective combination of inner and outside, become those skilled in the art's problem demanding prompt solution.
The information that is disclosed in this background of invention technology part is only intended to deepen the understanding to general background technology of the present invention, and should not be regarded as admitting or imply that in any form this information structure has been prior art known in those skilled in the art.
Summary of the invention
For addressing the above problem, the invention provides the outside burlap of a kind of prefabricated case beam and cover the manufacture method of the prefabricated case beam that watering maintenance and the inner water storing conservation of prefabricated case beam combine.
In order to achieve the above object, the invention provides a kind of manufacture method of prefabricated case beam, it comprises the following steps:
1) in template, build prefabricated case beam;
2) when the concreting of prefabricated case beam is complete, to the moisturizing of sprinkling water of the surface of prefabricated case beam;
3) reach after preliminary intensity (2.5MPa) at the concrete of prefabricated case beam, remove the template of prefabricated case beam;
4) surface of prefabricated case beam is covered, and the maintenance of sprinkling water;
5) through after very first time section, remove the core of prefabricated case beam, and shutoff carried out in prefabricated case beam inside, and after shutoff through the second time period to water filling in prefabricated case beam;
6), through after the 3rd time period, described shutoff is removed and the water in prefabricated case beam is discharged.
Preferably, complete 6～8 hours of the concreting that wherein said very first time section is prefabricated case beam, described the second time period is to be preferably 8 hours in 6-10 hour, described the 3rd time period is 7 days.
Preferably, wherein, in step 5) in be to the two ends of prefabricated case beam with carrying out shutoff, wherein an aperture is stayed so that retaining in one end.
Preferably, wherein, in step 5) in constantly give moisturizing in prefabricated case beam, remain that the water in prefabricated case beam is expired state.
Preferably, the difference of the temperature of wherein said water and prefabricated case beam surface temperature is not more than 15 DEG C.
Preferably, wherein, in step 2) to step 5) in the temperature difference between inside and surface, surface and the environment of prefabricated case beam be no more than 15 DEG C.
Preferably, wherein in step 4) in, adopt polylith burlap to cover, between described polylith burlap, be provided with the lap width of 5cm left and right.
The invention has the beneficial effects as follows: the maintenance construction technique that the present invention adopts prefabricated case beam outside burlap covering watering maintenance and the inner water storing conservation of prefabricated case beam to combine, prefabricated case beam outside is being carried out on the basis of burlap covering curing, to adopting water storing conservation in prefabricated case beam case, prefabricated case beam is by retaining in case, make to remain moistening in prefabricated case beam case, reduce prefabricated case beam internal temperature, can also relax day and night temperature simultaneously, crack preventing, concrete intensity attains full development, detect and the Experimental Comparison of concrete sample to the concrete sample with beam maintenance and standard curing by concrete bouncing back instrument, concrete strength meets design requirement, the each position of prefabricated case beam even intensity, strength development is good, very approaching with standard curing.
Brief description of the drawings
By Figure of description and be used from subsequently the detailed description of the invention of explanation the present invention some principle with Figure of description one, the further feature that the present invention has and advantage will become to be known or is more specifically illustrated.
Figure 1A is prefabricated case beam horizontal section shutoff schematic diagram.
Figure 1B is prefabricated case beam longitudinal profile shutoff schematic diagram.
Fig. 2 is maintenance flow chart of the present invention.
Detailed description of the invention
A lot of details are set forth in the following description so that fully understand the present invention.But the present invention can implement to be much different from alternate manner described here, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that, and therefore the present invention is not subject to the restriction of following public specific embodiment.
Below, by reference to the accompanying drawings specific embodiments of the invention are described.Refer to shown in accompanying drawing, the invention provides a kind of manufacture method of prefabricated case beam, mainly in existing manufacture method, to have introduced water filling maintenance, key technology is that prefabricated case beam manufacture process core mould carries out surface watering maintenance and internal water flooding maintenance to prefabricated case beam after removing simultaneously, curing time is all determined according to actual weather concrete condition, the watering maintenance of described surface is generally 28 days, and internal water flooding maintenance is generally 7 days.It mainly comprises the following steps:
1) in template, build prefabricated case beam;
2) when the concreting of prefabricated case beam is complete, to the moisturizing of sprinkling water of the surface of prefabricated case beam;
3) reach after preliminary intensity (2.5MPa) at the concrete of prefabricated case beam, remove the template of prefabricated case beam;
4) surface of prefabricated case beam is covered, and the maintenance of sprinkling water, described watering maintenance is performed until before prefabricated case beam use;
5) through after very first time section, remove the core of prefabricated case beam, and shutoff (shutoff of the present invention is that temporary plugging will be removed shutoff before prefabricated case beam uses) is carried out in prefabricated case beam inside, and after shutoff through the second time period to water filling in prefabricated case beam, complete 6～8 hours of the concreting that described very first time section is prefabricated case beam, described the second time period is to be preferably 8 hours in 6-10 hour or 7-9 hour, and described very first time section and described the second time period are all determined according to the weather conditions in actual area and concrete state;
6), through after the 3rd time period, described shutoff is removed and the water in prefabricated case beam is discharged.Described the 3rd time period is that described the 3rd time period is preferably 7 days to discharging before during this period of time to water after prefabricated case beam internal water flooding.In other words, the maintenance of always sprinkling water before prefabricated case beam uses, water storing conservation interts and carries out between watering curing period simultaneously.
The manufacture method of prefabricated case beam provided by the invention comprises prefabricated case beam surface maintenance and the maintenance of prefabricated case beam web.Prefabricated case beam surface maintenance, when the concreting of prefabricated case beam complete, to the moisturizing of spraying water of the surface of prefabricated case beam, after the concrete form removal of prefabricated case beam, adopt burlap to be covered, the maintenance of sprinkling water, to keep, beam surface is moistening to be as the criterion the number of times of sprinkling water every day; The maintenance of prefabricated case beam web, when the concreting of prefabricated case beam complete 6～8 hours, by after taking away as the inflated rubber core venting of inner formword to the two ends of prefabricated case beam with carrying out temporary plugging, wherein an aperture is stayed so that retaining in one end, after shutoff 8 hours start prefabricated case beam inside to carry out water storing conservation, in the watering of outside, constantly give moisturizing in case afterwards, remain that the water in prefabricated case beam is expired state maintenance 7 days.
As shown in the flow chart of Fig. 2, in specific embodiments of the invention, prefabricated case beam is made with maintenance processes as follows:
1, in template, build prefabricated case beam.
2, prefabricated case beam surface maintenance
When beam surface concrete is built complete, strengthen the moisturizing work of concrete surface, in the time that temperature is higher, dry, adopt water spray moisturizing, never allow water pipe directly to rush concrete surface, after concrete form removal, adopt polylith burlap to cover and adjacent burlap between overlap joint mutually, lap width between adjacent burlap is made as 5cm left and right, the maintenance of sprinkling water, the maintenance if special messenger sprinkles water on time, Liang Chang establishes special messenger's maintenance of on time sprinkling water, and to keep, beam surface is moistening to be as the criterion the number of times of sprinkling water every day.In the present embodiment, prefabricated case beam surface is carried out the watering maintenance of 28 days by a definite date.
3, web maintenance
The complete process of concreting very first time section 6～8 hours, after being taken away, inflated rubber core venting as inner formword the two ends of prefabricated case beam plugging material 103 is carried out to shutoff, as shown in Figure 1A and Figure 1B, wherein one end is stayed an aperture and is stretched into water injection pipe 101 so that retaining via this aperture, within after shutoff 8 hours, start prefabricated case beam 102 inside to carry out water storing conservation, in the watering of outside, constantly give moisturizing in case afterwards, remain the full state of water in prefabricated case beam.
4,, through after the 3rd 7 days time periods, the water in prefabricated case beam is discharged.
Preparation method construction precautions provided by the invention is as follows:
To the maintenance of sprinkling water of the concrete element of prefabricated case beam maintenance, make test specimen intensity and the simultaneous growth of beam body concrete intensity.
Between curing period, the difference of the surface temperature of concrete of maintenance water temperature and prefabricated case beam must not be greater than 15 DEG C.
Between the concrete belt mould curing period of prefabricated case beam, take to be with mould to wrap up, water, spray the measures such as watering and carry out moisture-keeping maintaining, ensure the unlikely desiccation of form joint place.
In the situation such as be exposed to the sun, there's a sudden fall in temperature, should take Insulation to prevent that concrete surface concrete is subject to such environmental effects and acute variation occurs.The temperature difference between curing period between concrete core and surface, surface and environment must not exceed 15 DEG C.
Build completely when back board concrete, in the time that temperature is higher, dry, adopt spraying facility (as: small-sized electric force (forcing) pump) pressure atomization moisturizing, never allow water pipe directly to rush concrete surface.
While adopting burlap to cover, must not note and pollute bridge floor, between burlap piece and piece, establish the lap width of 5cm left and right.
Fully moistening for ensureing concrete, establish special messenger's water seasoning on time, to guarantee that at any time geotextiles is all in abundant moisture state.Natural curing is no less than 14 days, and performs maintenance record.
Achievement of the present invention is:
1) construction technology is simple
Use conventional construction method and equipment, technical requirement is relatively low, only needs special messenger to sprinkle water and retaining, simple to operation, not limited by environmental condition.
2) prefabricated efficiency is higher
The maintenance construction technique that adopts prefabricated case beam outside burlap covering watering maintenance and the inner water storing conservation of prefabricated case beam to combine, detect prefabricated case beam by concrete bouncing back instrument, concrete sample to the concrete sample with beam maintenance and standard curing is tested, result of the test shows that prefabricated case beam has just met the requirement of strength of form removal for 3 days, within 5 days, just meet the requirement of strength of prefabricated stretch-draw, lack at goods and materials, prefabricated case beam template, in the limited situation of base, in the utilization rate that improves prefabricated case beam template, move in advance the beam time, shorten the aspect successfuls such as prefabricated duration.
3) maintenance effect is obvious
The maintenance construction technique that adopts prefabricated case beam outside burlap covering watering maintenance and the inner water storing conservation of prefabricated case beam to combine, can prevent concrete surface crack effectively, observes by outward appearance, prefabricated case beam surface is without honeycomb, pitted skin, solid colour, without obvious Construction Joint, surperficial free from flaw.The maintenance construction technique that adopts prefabricated case beam outside burlap covering watering maintenance and the inner water storing conservation of prefabricated case beam to combine, concrete intensity attains full development, detect and the Experimental Comparison of concrete sample to the concrete sample with beam maintenance and standard curing by concrete bouncing back instrument, concrete strength meets design requirement, the each position of prefabricated case beam even intensity, strength development is good, very approaching with standard curing.
Above-described embodiment is for illustrative principle of the present invention and effect thereof, but the present invention is not limited to above-mentioned embodiment.Those skilled in the art all can, under spirit of the present invention and category, in claim protection domain, modify to above-described embodiment.Therefore protection scope of the present invention, should cover as claims of the present invention.
Claims (7)
1. a manufacture method for prefabricated case beam, it comprises the following steps:
1) in template, build prefabricated case beam;
2) when the concreting of prefabricated case beam is complete, to the moisturizing of sprinkling water of the surface of prefabricated case beam;
3) reach after preliminary intensity at the concrete of prefabricated case beam, remove the template of prefabricated case beam;
4) surface of prefabricated case beam is covered, and the maintenance of sprinkling water;
5) through after very first time section, remove the core of prefabricated case beam, and shutoff carried out in prefabricated case beam inside, and after shutoff through the second time period to water filling in prefabricated case beam;
6), through after the 3rd time period, described shutoff is removed and the water in prefabricated case beam is discharged.
2. the manufacture method of prefabricated case beam according to claim 1, complete 6～8 hours of the concreting that wherein said very first time section is prefabricated case beam, described the second time period is 6-10 hour, described the 3rd time period is 7 days.
3. the manufacture method of prefabricated case beam according to claim 2, wherein, in step 5) in be that shutoff is carried out in the two ends of prefabricated case beam, wherein an opening is stayed so that retaining in one end.
4. the manufacture method of prefabricated case beam according to claim 3, wherein, in step 5) in give moisturizing in prefabricated case beam, keep the water in prefabricated case beam to expire state.
5. the manufacture method of prefabricated case beam according to claim 4, the difference of the temperature of wherein said water and prefabricated case beam surface temperature is not more than 15 DEG C.
6. the manufacture method of prefabricated case beam according to claim 5, wherein, in step 2) to step 5) in the temperature difference between inside and surface, surface and the environment of prefabricated case beam be no more than 15 DEG C.
7. the manufacture method of prefabricated case beam according to claim 6, wherein in step 4) in, adopt polylith burlap to cover, between described polylith burlap, be provided with the lap width of 5cm left and right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410301514.0A CN104085040A (en) | 2014-06-27 | 2014-06-27 | Method for manufacturing prefabricated box girder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410301514.0A CN104085040A (en) | 2014-06-27 | 2014-06-27 | Method for manufacturing prefabricated box girder |
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| CN104085040A true CN104085040A (en) | 2014-10-08 |
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| CN201410301514.0A Pending CN104085040A (en) | 2014-06-27 | 2014-06-27 | Method for manufacturing prefabricated box girder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486936A (en) * | 2016-06-13 | 2017-12-19 | 中铁十二局集团有限公司 | A kind of fast electric heating single hole prefabricated box -beam method |
| CN115787517A (en) * | 2022-06-29 | 2023-03-14 | 山西省交通新技术发展有限公司 | A Shear Strengthening Method of Concrete Hollow Slab Beam without Interrupting Traffic |
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| CN202029230U (en) * | 2011-03-06 | 2011-11-09 | 中铁四局集团第五工程有限公司 | In-box automatic cycle spray device of a large scale box girder |
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2014
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| US4273740A (en) * | 1976-12-30 | 1981-06-16 | Vianini, S.P.A. | Process and apparatus for manufacturing single piece railroad ties of prestressed concrete |
| JP2003291126A (en) * | 2002-04-04 | 2003-10-14 | Asahi Concrete Works Co Ltd | Concrete curing method |
| CN101804667A (en) * | 2010-03-30 | 2010-08-18 | 北京交通大学 | Pre-stressed box girder body concrete cooling method |
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| CN202029230U (en) * | 2011-03-06 | 2011-11-09 | 中铁四局集团第五工程有限公司 | In-box automatic cycle spray device of a large scale box girder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107486936A (en) * | 2016-06-13 | 2017-12-19 | 中铁十二局集团有限公司 | A kind of fast electric heating single hole prefabricated box -beam method |
| CN115787517A (en) * | 2022-06-29 | 2023-03-14 | 山西省交通新技术发展有限公司 | A Shear Strengthening Method of Concrete Hollow Slab Beam without Interrupting Traffic |
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Application publication date: 20141008 |