CN109702888A - Board production technology is overlapped under a kind of cryogenic conditions - Google Patents
Board production technology is overlapped under a kind of cryogenic conditions Download PDFInfo
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- CN109702888A CN109702888A CN201811616688.0A CN201811616688A CN109702888A CN 109702888 A CN109702888 A CN 109702888A CN 201811616688 A CN201811616688 A CN 201811616688A CN 109702888 A CN109702888 A CN 109702888A
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- concrete
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- superimposed sheet
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Abstract
The invention discloses overlap board production technology under a kind of cryogenic conditions, it is related to prefabricated superimposed sheet technical field, it is laid with including formwork, in mold steel bar girder and casting concrete, temperature control maintenance and demoulding, cementitious material in concrete is slag cements, and mixed with the high-quality fly ash of 15%-20% in concrete, concreting uses the operation form of placement layer by layer, and interlayer maximum duration interval is less than the concrete initial set time.The present invention provides superimposed sheet production efficiency can be improved, guarantees superimposed sheet structural strength, can effectively avoid thermal cracking, and can substantially reduce and overlap board production technology under a kind of cryogenic conditions of production cost.
Description
Technical field
The present invention relates to prefabricated superimposed sheet technical fields, specifically, it to provide superimposed sheet under a kind of cryogenic conditions raw
Production. art.
Background technique
Superimposed sheet is a kind of using precast slab as bottom plate, and rear pouring concrete overlapping layers, pours completion on it
The latter two are mainly used in assembled architecture and bridge floor superimposed sheet structure as assembled integral floor.Currently, generally making
Superimposed sheet processing method is: steel bar girder being placed in dedicated processing mould, then pours high fluidity filler, then shake
High fluidity filler in dynamic pressure reality dedicated processing mould makes high fluidity filler and steel bar girder form band reinforcing bar in mold
The superimposed sheet of truss.But at low ambient temperatures, when concreting is completed, since temperature difference between inside and outside concrete is larger, superimposed sheet
Surface is easy to produce thermal cracking, on the one hand causes staff to need to make later period repairing, on the other hand also results in superimposed sheet
Intensity substantially reduce, influence the Forming Quality of superimposed sheet.
Summary of the invention
In view of the above technical problems, it the object of the present invention is to provide board production technology is overlapped under a kind of cryogenic conditions, avoids
Superimposed sheet generates thermal cracking, guarantees the structural strength of superimposed sheet, improves the Forming Quality and production efficiency of superimposed sheet.
To achieve the above object, the present invention provides the following technical scheme that
Board production technology is overlapped under a kind of cryogenic conditions, is included the following steps:
S1, formwork；
S2, steel bar girder and casting concrete are laid in mold；
S3, temperature control maintenance carry out isothermal holding to overlapping plate surface；
S4, demoulding.
By using above-mentioned technical proposal, after the completion of formwork, steel bar girder is laid in die inside；When superimposed sheet pours
After molding, steel bar girder can be fixed in superimposed sheet by pouring, and can effectively improve the structural strength of superimposed sheet.Meanwhile mixed
After the completion of solidifying soil pours, it is contemplated that ambient air temperature is lower, carries out isothermal holding to overlapping plate surface, avoids concrete is inside and outside from generating
The excessive temperature difference is prevented cold outside concrete Yin Neire and is cracked.In this way, overlapping plate surface is avoided to generate crack, no
Patch work can be only saved, improves production efficiency, moreover it is possible to the structural strength of superimposed sheet be effectively ensured, improve the molding matter of superimposed sheet
Amount.
The present invention is further arranged to: in step s 2, the cementitious material in concrete is slag cements, and in concrete
Mixed with the high-quality fly ash of 15%-20%.
By using above-mentioned technical proposal, slag cements is also portland slag cement, can be used for preparing high-strength, Gao Xing
Energy concrete, not only can be improved the water-retaining property, plasticity and workability of concrete, moreover it is possible to reduce the heat of hydration, be beneficial to prevent mixed
Crack caused by solidifying soil internal temperature rise.Meanwhile high-quality fly ash is mixed in concrete, the workability of concrete can be improved,
Help to reduce concrete water bleeding, the intensity of superimposed sheet can be improved, and the heat of hydration can be effectively reduced, and then helps to alleviate overlapping
Plate surface is easy to produce the problem of thermal cracking.
The present invention is further arranged to: the UEA swelling agent of 1.5%-2% is also added in concrete.
By using above-mentioned technical proposal, UEA swelling agent is mixed and produces a large amount of dilatancy crystallization hyrate and right after water
Concrete generates compression, which can offset the tensile stress generated when concrete shrinkage, to prevent or reduce concrete
Shrinkage cracking, so that concrete densifies.
The present invention is further arranged to: in step s 2, concreting uses the operation form of placement layer by layer, and interlayer
Maximum duration interval is less than the concrete initial set time.
By using above-mentioned technical proposal, using the operation form of placement layer by layer, so that superimposed sheet inner concrete can be fast
Speed heat dissipation, avoids inside concrete from generating the excessive temperature difference.Meanwhile strict control interlayer pours time interval, avoids it from being more than
The concrete initial set time prevents from generating construction joint between adjacent two layers, and superimposed sheet Forming Quality is effectively ensured.
The present invention is further arranged to: in step s 2, before carrying out concreting, parallel interval is laid in mold
Several cooling water pipes, cooling water pipe and steel bar girder are in setting in the same direction；During step S3 is carried out, lead into cooling water pipe
Water.
By using above-mentioned technical proposal, in temperature control maintenance processes, the water flowing into cooling water pipe utilizes cooling water pipe pair
Inside concrete cools down, to integrally realize drop in outer protect to superimposed sheet, controls superimposed sheet internal-external temperature difference, avoids superimposed sheet
Surface formation temperature crack.
The present invention is further arranged to: during step S3 is carried out, the water flowing flow for controlling cooling water pipe is 0.8-
1.2m3/ h, and at interval of 1.5-2h exchange primary cooling water pipe into, return water direction.
By using above-mentioned technical proposal, the water flowing flow of cooling water pipe is controlled, guarantees the cooling effect of concrete；Together
When, intermittence adjustment cooling water pipe into, return water direction, guarantee concrete on cooling water pipe extending direction each point temperature it is equal
Weighing apparatus property, can further alleviate the generation of thermal cracking.
The present invention is further arranged to: water temperature and the temperature difference of concrete are 20 DEG C~25 DEG C in cooling water pipe.
By using above-mentioned technical proposal, the temperature difference of strict control water temperature and concrete, it is ensured that temperature difference between inside and outside concrete
No more than 25 DEG C, alleviate the generation of thermal cracking.
The present invention is further arranged to: in step s3, concrete surface is at least equipped with the first insulating layer from the bottom to top
With the second insulating layer.
By using above-mentioned technical proposal, the first insulating layer and the second insulating layer are comprehensively utilized, concrete surface is realized
Sufficiently heat preservation reduces temperature difference between inside and outside concrete, alleviates the generation of thermal cracking.
In conclusion the invention has the following advantages:
1, while guaranteeing superimposed sheet structural strength using steel bar girder, temperature control is carried out to the concrete after the completion of pouring and is supported
Shield prevents concrete is inside and outside from generating the excessive temperature difference, avoids overlapping plate surface from generating thermal cracking, saves patch work, improves life
Efficiency is produced, guarantees superimposed sheet structural strength, and superimposed sheet Forming Quality is greatly improved；
2, concrete pouring operation is carried out in the form of placement layer by layer, cooperation cooling water pipe cools down to inside concrete,
Effectively control temperature difference between inside and outside concrete, alleviates the generation of thermal cracking, further increases superimposed sheet Forming Quality；
3, slag cements, high-quality fly ash and UEA swelling agent are mixed in concrete, guarantee superimposed sheet Forming Quality, and reduce
Production cost.
Detailed description of the invention
The flow diagram of board production technology is overlapped in Fig. 1 one embodiment of the invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is described in detail.
Referring to attached drawing 1, board production technology is overlapped under a kind of cryogenic conditions, superimposed sheet can be overcome to be easy to produce at low ambient temperatures
The problem of raw thermal cracking comprising following steps:
S1, formwork.In normal production, superimposed sheet pours operation and can integrally complete in steel platform；Before starting to pour, first exist
Formwork is carried out in steel platform, and correspondence is poured into mold and is fixed in steel platform, mold is poured and integrally surrounds square frame knot
Structure, inside mold casting area for pouring molding superimposed sheet.
S2, steel bar girder and casting concrete are laid in mold.After the completion of formwork, can first it be laid in mold several
Steel bar girder, each steel bar girder are parallel to each other, and are arranged on die width direction in uniform intervals；When laying, when reinforcing bar purlin
After the position of frame determines, each steel bar girder is detachably fixed with mold simultaneously.While being laid with steel bar girder, staff
It should also be synchronized in mold and be laid with several cooling water pipes, cooling water pipe and steel bar girder in setting in the same direction；Each cooling water pipe is mutual
It is arranged in parallel and in uniform intervals.After completing above-mentioned preparation, staff can start the progress concrete in mold and pour
Build operation.
To guarantee superimposed sheet Forming Quality, when preparation superimposed sheet is poured with concrete, the cementitious material of concrete can be adopted
Use slag cements.Slag cements is also portland slag cement, can be used for preparing high-strength, high performance concrete, can not only mention
Water-retaining property, plasticity and the workability of high concrete, moreover it is possible to reduce the heat of hydration, be beneficial to prevent inside concrete temperature rise and cause
Crack.Coarse aggregate in concrete can be selected the stone of 5-40mm continuous grading, fine aggregate can be used in, coarse sand, and it is stringent
Aggregate clay content is controlled below 1.5%.Meanwhile the high-quality fly ash of 15%-20% can also be mixed in concrete；In coagulation
High-quality fly ash is mixed in soil, can improve the workability of concrete, helps to reduce concrete water bleeding, the strong of superimposed sheet can be improved
Degree, and the heat of hydration can be effectively reduced, and then help further to alleviate the problem of overlapping plate surface is easy to produce thermal cracking.This
Outside, the UEA swelling agent of 1.5%-2% can also be added in concrete.UEA swelling agent produces a large amount of dilatancy knot after mixing water
Brilliant hyrate simultaneously generates compression to concrete, which can offset the tensile stress generated when concrete shrinkage, to prevent
Or Shrinkage Cracking of Concrete is reduced, so that concrete densifies.
After the completion of Concrete, staff can complete concrete pouring operation by way of placement layer by layer.It is practical
When operation, staff first determines the number of plies of layering according to the design thickness of superimposed sheet, then in mold from the bottom to top successively
Pour multi-layer concrete.When pouring, strict control layer pours time interval, it is ensured that interlayer builds time interval and is no more than concrete
Presetting period prevents from generating construction joint between neighboring layers concrete, helps to improve superimposed sheet Forming Quality.
S3, temperature control maintenance carry out isothermal holding to overlapping plate surface.After concreting is completed and is condensed, work people
Member can be laid with several insulating layers on superimposed sheet, to realize isothermal holding to concrete surface.In the present embodiment, insulating layer by
Under it is supreme successively include the first insulating layer and the second insulating layer；In practice of construction, 1 layer or laminated plastics is can be used in the first insulating layer
1 layer or 2 layers of gunnysack can be used in film, the second insulating layer.The measure can meet temperature control index request, avoid concrete is inside and outside from generating
The excessive temperature difference, prevents concrete from cracking because of excessive temperature differentials.
While carrying out temperature control maintenance, staff can the water flowing into above-mentioned cooling water pipe, using cooling water pipe to mixed
Solidifying soil is internal to cool down, and cooperates above-mentioned each insulating layer, and drop in outer protect integrally is realized to superimposed sheet, controls temperature inside and outside superimposed sheet
Difference.In practical operation, staff understands real-time monitoring water temperature, and by water temperature and the control of the temperature difference of concrete 20 DEG C~25
DEG C, alleviate the generation of thermal cracking.Meanwhile the water-flowing amount of strict control cooling water pipe is 0.8-1.2m3/ h, and at interval of 1.5-
2h exchange primary cooling water pipe into, return water direction, guarantee the equilibrium of concrete each point temperature on cooling water pipe extending direction
Property.
S4, demoulding.After temperature control conserves completion and superimposed sheet basic forming, staff can start demoulding, by superimposed sheet
It is removed from steel platform and is carried to specific fog room and carry out natural curing；It, can be stringent to avoid superimposed sheet from cracking because of low temperature
Fog room internal temperature is controlled, so that fog room internal temperature is not less than 10 DEG C.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (8)
1. overlapping board production technology under a kind of cryogenic conditions, which comprises the steps of:
S1, formwork；
S2, steel bar girder and casting concrete are laid in mold；
S3, temperature control maintenance carry out isothermal holding to overlapping plate surface；
S4, demoulding.
2. overlapping board production technology according to claim 1, which is characterized in that in step s 2, the gelling in concrete
Material is slag cements, and mixed with the high-quality fly ash of 15%-20% in concrete.
3. overlapping board production technology according to claim 1 or 2, which is characterized in that be also added with 1.5%- in concrete
2% UEA swelling agent.
4. overlapping board production technology according to claim 1, which is characterized in that in step s 2, concreting uses
The operation form of placement layer by layer, and interlayer maximum duration interval is less than the concrete initial set time.
5. overlapping board production technology according to claim 1, which is characterized in that in step s 2, poured carrying out concrete
Before building, parallel interval is laid with several cooling water pipes, cooling water pipe and steel bar girder in setting in the same direction in mold；Step S3 into
During row, the water flowing into cooling water pipe.
6. overlapping board production technology according to claim 5, which is characterized in that during step S3 is carried out, control cold
But the water flowing flow of water pipe is 0.8-1.2m3/ h, and at interval of 1.5-2h exchange primary cooling water pipe into, return water direction.
7. overlapping board production technology according to claim 6, which is characterized in that the temperature of water temperature and concrete in cooling water pipe
Degree difference is 20 DEG C~25 DEG C.
8. overlapping board production technology according to claim 1, which is characterized in that in step s3, concrete surface is under
It is supreme to be at least equipped with the first insulating layer and the second insulating layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811616688.0A CN109702888A (en) | 2018-12-27 | 2018-12-27 | Board production technology is overlapped under a kind of cryogenic conditions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811616688.0A CN109702888A (en) | 2018-12-27 | 2018-12-27 | Board production technology is overlapped under a kind of cryogenic conditions |
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| Publication Number | Publication Date |
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| CN109702888A true CN109702888A (en) | 2019-05-03 |
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| CN201811616688.0A Pending CN109702888A (en) | 2018-12-27 | 2018-12-27 | Board production technology is overlapped under a kind of cryogenic conditions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216774A (en) * | 2019-06-20 | 2019-09-10 | 浙江远大勤业住宅产业化有限公司 | A kind of production technology of prefabricated component superimposed sheet |
| CN113715148A (en) * | 2021-07-15 | 2021-11-30 | 南通欧力达建筑科技有限公司 | Production process for concrete pouring of modular laminated slab |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1044334A (en) * | 1996-08-07 | 1998-02-17 | Kasai Kogyo Co Ltd | Interior material for automobile |
| CN101275435A (en) * | 2008-05-15 | 2008-10-01 | 浙江中富建筑集团股份有限公司 | Building wall crack repairing method |
| CN101638940A (en) * | 2009-05-26 | 2010-02-03 | 中冶集团华冶资源开发有限责任公司 | Large plate mass concrete seamless construction method |
| CN105401562A (en) * | 2015-10-24 | 2016-03-16 | 江南水利水电工程公司 | Method for preventing concrete of spillway tunnel of hydropower station from cracking |
-
2018
- 2018-12-27 CN CN201811616688.0A patent/CN109702888A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1044334A (en) * | 1996-08-07 | 1998-02-17 | Kasai Kogyo Co Ltd | Interior material for automobile |
| CN101275435A (en) * | 2008-05-15 | 2008-10-01 | 浙江中富建筑集团股份有限公司 | Building wall crack repairing method |
| CN101638940A (en) * | 2009-05-26 | 2010-02-03 | 中冶集团华冶资源开发有限责任公司 | Large plate mass concrete seamless construction method |
| CN105401562A (en) * | 2015-10-24 | 2016-03-16 | 江南水利水电工程公司 | Method for preventing concrete of spillway tunnel of hydropower station from cracking |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216774A (en) * | 2019-06-20 | 2019-09-10 | 浙江远大勤业住宅产业化有限公司 | A kind of production technology of prefabricated component superimposed sheet |
| CN113715148A (en) * | 2021-07-15 | 2021-11-30 | 南通欧力达建筑科技有限公司 | Production process for concrete pouring of modular laminated slab |
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Application publication date: 20190503 |
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