CN1515764A - Ultra-thin superlength reinforced concrete structure seamless construction method - Google Patents
Ultra-thin superlength reinforced concrete structure seamless construction method Download PDFInfo
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- CN1515764A CN1515764A CNA031184197A CN03118419A CN1515764A CN 1515764 A CN1515764 A CN 1515764A CN A031184197 A CNA031184197 A CN A031184197A CN 03118419 A CN03118419 A CN 03118419A CN 1515764 A CN1515764 A CN 1515764A
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Abstract
The present invention discloses a seamless construction method for ultrathin and ultralong reinforced concrete structure. It includes the following steps: binding steel bar, placing concrete, placing after-depositing band concrete and curing concrete. It combines the microexpansion concrete construction, after-depositing band construction and post-tensioned cohesive-less stressed concrete construction technology into one body to make comprehensive application. At the same time an improved concrete curing method is adopted.
Description
Technical field
The invention belongs to technical field of building construction, especially belong to the seamless construction method field of ultra-thin over-long reinforced concrete structure.
Background technology
Structure of reinforced concrete is the construction of a routine, seems few of technology content, and actually this is not so.We usually see the many cracks of generation on the reinforced concrete structure, and the generation in crack is more usual on the particularly long and thin reinforced concrete structure.Should all construct according to " rules " by each construction unit, but all produce the crack on the reinforced concrete structure in many engineerings, this phenomenon is too general, and they almost are inevitable.Along with continuous advancement in technology, the someone has proposed the employing slightly expanded concrete and the ater-casting way of combining addresses this problem.The stress that slightly expanded concrete produces in the time of can resisting concrete shrinkage prevents and reduces the appearance of shrinkage crack; The ater-casting is a kind of a kind of effective measures that enlarge shrinkage joint spacing and cancellation shrinkage joint, this " seam " is more much bigger and only exist in construction period than common shrinkage joint, it be concrete flexible reach balance after, " seam " that to reserve again (being the ater-casting) used higher leveled concrete pouring, thereby reaches the purpose that makes overall structure seamless.Above technology can obtain effect preferably to a certain extent for general structure.But the concrete structure of ultra-thin overlength requires to accomplish that seamless to only depend on these two technology be not all right, and overlength described here is meant that length reaches more than more than 100 meter, and the ultra-thin thickness of structure that is meant only has only several centimeters.It is thin too that they have been oversize really, and the stress that the itself structure is produced when variations in temperature is to be difficult to eliminate, and this stress must cause the imbalance of structure, thereby produces the crack.So the jointless construction of ultra-thin over-long reinforced concrete structure also has a series of technical problem to need to solve.
Summary of the invention
Needs at the deficiencies in the prior art and technical development, the method that the purpose of this invention is to provide a kind of ultra-thin over-long reinforced concrete structure jointless construction, it can guarantee the construction quality of ultra-thin over-long reinforced concrete structure, makes integral body reach seamless remarkable result.
The object of the present invention is achieved like this: the seamless construction method of ultra-thin over-long reinforced concrete structure comprises that reinforcing bar rolls, fluid concrete, cast ater-casting concrete, concrete curing, its special feature is: with the integrated application that combines of slightly expanded concrete construction, ater-casting construction, post tensioning unbonded prestressed concrete construction technology, adopt improved concrete curing method simultaneously; Concrete job practices is carried out according to following steps in order:
A, lay when rolling reinforcing bar and the colligation no-cohesive prestressed reinforcement,
B, 55m-70m reserves the ater-casting of 700-900mm on the concrete structure length direction,
C, cast admixture have expansion agent CSA (3Cao.Al
2O
3.3CaSO
4, calcium sulphoaluminate) slightly expanded concrete, the addition content of expansion agent is 7%-12%, after concrete surface is received and is done, with wood float rubbing and pressure concrete surface 2-3 time, after rubbing and pressure are intact immediately covered with plastic film and two-layer straw bag concrete is carried out maintenance, curing time, must not be less than 14 days;
Pour into a mould than the higher leveled slightly expanded concrete of former fluid concrete D, ater-casting, after concrete surface is received and is done, with wood float rubbing and pressure concrete surface 2-3 time, after rubbing and pressure are intact immediately covered with plastic film and two-layer straw bag the concrete of cast is carried out maintenance, curing time, must not be less than 14 days;
E, when the ater-casting concrete strength reaches designing requirement, carry out prestressed stretch-draw.
The method for continuous casting that advances is in proper order adopted in the cast of ultra-thin overlength steel concrete, and each waters casting and all is controlled in the 2m along its length, and successively Jiao Zhu the concrete joint stranding time is no more than 150 minutes (being strict controlled within the initial setting time).
The error of prestressed stretch-draw should be controlled in design load-0.5%-+10% scope.
Method of the present invention, applied slightly expanded concrete, ater-casting concrete, and the prestressed stretch-draw three technology be prior art, still, nobody bonds them together application.Because the integrated application of this three technology, make the jointless construction quality of ultra-thin over-long reinforced concrete structure reach the requirement of engineering.Concrete curing is not subjected to people's real attention always, and in fact, concrete curing is to guarantee a seamless key technology of structure, has proposed a kind of simple concrete curing method in the present invention, and it is very effective.Though general concrete construction requires to treat concrete surface and receives wood float rubbing and pressure concrete surface 1 time of dried back, places one deck straw bag then, adds the water-wet maintenance, in fact is difficult to guarantee the maintenance in later stage.After the present invention treats in concrete construction that then the concrete surface receipts are done, must rubbing and pressure 2-3 time, prevent that in time settlement crack, plastic crack and surperficial shrinkage crack etc. from appearring in concrete surface, last carries out maintenance after finishing all over rubbing and pressure immediately, maintenance is adopted never has used plastic sheeting of people and double-deck straw bag to cover, guarantee the moistening of concrete surface, curing time, be no less than 14 days, thereby guaranteed that this ultra-thin over-long reinforced concrete structure does not have the crack.
The specific embodiment
Situation below in conjunction with specific embodiment is described technology of the present invention in further detail.Certain stadium, sports center is the big stadium of the whole nation the 3rd scale, and this stadium is located in the famous Wuhan, stove city of China, and all grandstands are open-air ultra-thin super-long structural, and the gross area is 63280m
2, technical scheme of the present invention promptly is to create to come out in the practice of construction of this project.This project design is divided into four bleacher areas of East, West, South, North, each long 230m of thing grandstand hoop, each long 180m of north and south grandstand hoop, the thick 60mm of grandstand floor.The whole grandstand concrete structure in this stadium really belongs to rare ultra-thin Overlong Concrete Structure, and the gross area is very big, guarantee that so large-area ultra-thin Overlong Concrete Structure is seamless, really is a very difficult task.The inventor has taken into full account the contraction of overlength superthin concrete structure and the temperature difference will make structure produce the characteristics in crack, and whole stadium grandstand is the concrete condition of bleacher, create a brand-new technology scheme, promptly adopted non-bonding prestressed concrete technique, the up-to-date CSA expansion agent (3CaO.Al of admixture
2O
3.3CaSO
4, calcium sulphoaluminate) slightly expanded concrete technology and ater-casting technology three technology integrated application; Adopt the concrete curing method of innovation simultaneously, after treating that promptly the concrete surface receipts are done, must rubbing and pressure 2-3 time, prevent that in time settlement crack, plastic crack and surperficial shrinkage crack etc. from appearring in concrete surface, last carries out maintenance after finishing all over rubbing and pressure immediately, maintenance is adopted never has used plastic sheeting of people and double-deck straw bag to cover, and guarantees the moistening of concrete surface, and curing time is no less than 14 days; The integrated application of these technical measures has realized the jointless construction of the whole grandstands in stadium.This stadium ultra-thin reinforced concrete structure of grandstand large tracts of land overlength adopts seamless construction method of the present invention to finish June calendar year 2001, and so far the existing time more than a year, winter gave place to spring, exposes to the sun and rain, and through detecting, do not find any crack on the spot.Method of the present invention is applicable to the jointless construction of the ultra-thin reinforced concrete structure of various overlength.
Claims (4)
1, a kind of seamless construction method of ultra-thin over-long reinforced concrete structure comprises that reinforcing bar rolls, fluid concrete, and cast ater-casting concrete, concrete curing is characterized in that: construction is carried out according to the method for following steps:
A, lay when rolling reinforcing bar and the colligation no-cohesive prestressed reinforcement,
B, 55m-70m reserves the ater-casting of 700-900mm on the concrete structure length direction,
C, cast admixture have expansion agent CSA (3Cao.Al
2O
3.3CaSO
4, calcium sulphoaluminate) slightly expanded concrete, the addition content of expansion agent is 7%-12%, and concrete is carried out maintenance;
Pour into a mould than the higher leveled slightly expanded concrete of former fluid concrete D, ater-casting, and concrete is carried out maintenance;
E, when the ater-casting concrete strength reaches designing requirement, carry out prestressed stretch-draw.
2, method according to claim 1 is characterized in that; Described concrete curing method is after concrete surface receive to be done, rubbing and pressure concrete surface 2-3 time, after rubbing and pressure finish immediately covered with plastic film and two-layer straw bag concrete is carried out maintenance, curing time, must not be less than 14 days.
3, method according to claim 1 and 2 is characterized in that: the method for continuous casting that advances is in proper order adopted in concrete pouring, and each waters casting and all is controlled in the 2m along its length, and successively Jiao Zhu the concrete joint stranding time is no more than 150 minutes.
4, according to the described method of arbitrary claim in the claim 1 to 3, it is characterized in that: the error of prestressed stretch-draw should be controlled at design load-the 0.5%-+10% scope in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031184197A CN1194151C (en) | 2003-01-06 | 2003-01-06 | Ultra-thin superlength reinforced concrete structure seamless construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031184197A CN1194151C (en) | 2003-01-06 | 2003-01-06 | Ultra-thin superlength reinforced concrete structure seamless construction method |
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| CN1515764A true CN1515764A (en) | 2004-07-28 |
| CN1194151C CN1194151C (en) | 2005-03-23 |
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| CNB031184197A Expired - Fee Related CN1194151C (en) | 2003-01-06 | 2003-01-06 | Ultra-thin superlength reinforced concrete structure seamless construction method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420793C (en) * | 2006-06-28 | 2008-09-24 | 中铁大桥勘测设计院有限公司 | Double breadth prestressed concrete seamless connection bridge |
| CN101691761B (en) * | 2009-09-18 | 2011-05-04 | 大连九洲建设集团有限公司 | Basement shear wall with expanded band vertically welded with steel plate |
| CN102251674A (en) * | 2011-06-05 | 2011-11-23 | 山东宁建建设集团有限公司 | Bunker-skipping type seamless construction method of ultra-long concrete structure |
| CN102758437A (en) * | 2012-07-27 | 2012-10-31 | 上海建工集团股份有限公司 | Circular foundation pit construction method for pouring ultra-large volume concrete radially from center to edge |
| CN102965124A (en) * | 2012-11-26 | 2013-03-13 | 中冶焦耐工程技术有限公司 | Base structure of coke oven |
| CN104047410A (en) * | 2014-06-11 | 2014-09-17 | 江南园林有限公司 | Stone paving construction method |
| CN104131622A (en) * | 2014-08-14 | 2014-11-05 | 华南理工大学建筑设计研究院 | Method for controlling cracking of ultra-long reinforced concrete structures and jacking device |
-
2003
- 2003-01-06 CN CNB031184197A patent/CN1194151C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100420793C (en) * | 2006-06-28 | 2008-09-24 | 中铁大桥勘测设计院有限公司 | Double breadth prestressed concrete seamless connection bridge |
| CN101691761B (en) * | 2009-09-18 | 2011-05-04 | 大连九洲建设集团有限公司 | Basement shear wall with expanded band vertically welded with steel plate |
| CN102251674A (en) * | 2011-06-05 | 2011-11-23 | 山东宁建建设集团有限公司 | Bunker-skipping type seamless construction method of ultra-long concrete structure |
| CN102758437A (en) * | 2012-07-27 | 2012-10-31 | 上海建工集团股份有限公司 | Circular foundation pit construction method for pouring ultra-large volume concrete radially from center to edge |
| CN102965124A (en) * | 2012-11-26 | 2013-03-13 | 中冶焦耐工程技术有限公司 | Base structure of coke oven |
| CN104047410A (en) * | 2014-06-11 | 2014-09-17 | 江南园林有限公司 | Stone paving construction method |
| CN104047410B (en) * | 2014-06-11 | 2016-08-24 | 江南园林有限公司 | Stone material paving construction method |
| CN104131622A (en) * | 2014-08-14 | 2014-11-05 | 华南理工大学建筑设计研究院 | Method for controlling cracking of ultra-long reinforced concrete structures and jacking device |
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| Publication number | Publication date |
|---|---|
| CN1194151C (en) | 2005-03-23 |
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