CN102677898A - Sequence construction method for large area reinforced concrete floors - Google Patents
Sequence construction method for large area reinforced concrete floors Download PDFInfo
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- CN102677898A CN102677898A CN2011100651210A CN201110065121A CN102677898A CN 102677898 A CN102677898 A CN 102677898A CN 2011100651210 A CN2011100651210 A CN 2011100651210A CN 201110065121 A CN201110065121 A CN 201110065121A CN 102677898 A CN102677898 A CN 102677898A
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Abstract
The invention discloses a sequence construction method for large area reinforced concrete floors. According to construction, areas with length and width which are both less than 50m are numbered one by one along any direction, plate steel bars can be sequentially bound one after another based on a construction arrangement, a concrete casting is performed in a sequence mode, an ordinary construction joint processing method is utilized between a 9m laminate block and a 15m laminate block, each side of each plate construction joint is provided with a 'rapid and easy setback grid' the plate steel bars are constructed according to a normal plate steel bar binding method, a disconnecting process is absent, a concrete pouring utilizes a construction method of 'one inclined plane, a continuous pouring, one-time reaching top', a concrete inclined plane slope is 1:6, before an initial setting of the concrete, the surface of the concrete is subjected to a rolling by an iron roller, and the concrete is flatly rubbed at least three times by a wood float after the concrete is hardened. The method has the advantages that the cracking effect can be effectively controlled, the construction is convenient, the construction period is shortened, the cost is reduced, and the quality is reliable.
Description
Technical field
The invention belongs to floor and jump construction technique field, storehouse, particularly a kind of Large area reinforced concrete floor is jumped the job practices of storehouse concreting, promptly relates to a kind of Large area reinforced concrete floor and jumps storehouse method job practices.
Background technology
For class formations such as retaining wall, basement wall, " Code for design of concrete structures " (GB50010-2002) stipulated, shrinkage joint maximum spacing (in indoor or native) is 30m.Stay the shrinkage joint not only to bother, also cause easily and leak and unfavorable antidetonation.Do not establish permanent shrinkage joint and adopt construction ater-casting control concrete early-age shrinkage crack, many engineering practices show it is effectively, and enroll relevant design and job specfication, rules the sixth of the twelve Earthly Branches.For the large tracts of land floor slab construction, the main at present method construction of still adopting the reservation ater-casting.For existing routine the way of ater-casting is set, its disadvantage mainly is: the 1. bigger building of length and width, and the ater-casting is set not only bothers (indwelling time is long), also cause easily and leak and unfavorable antidetonation; 2. because the time that the ater-casting is stayed is longer, and many building wastes fall in the band inevitably, and cleaning work is very difficult, must not influence workmanship if do not clean out; 3. because the time that the ater-casting is stayed is longer, must take waterproof measure, bring many inconvenience, influence construction speed to construction; 4. before the placing of concrete of ater-casting, the former concrete surface in both sides, ater-casting must be cleaned out, and is reliably bonding to guarantee that New-old concrete has, this operation construction trouble; The normal concrete that is mixed with expansion agent that adopts in ater-casting, maintenance is extremely important, need fully water two weeks of water saturation maintenance, otherwise joint is prone to two minute cracks of formation, causes the hidden danger of leaking.
Summary of the invention
Main purpose of the present invention is to the problem that exists in the above-mentioned prior art, provides a kind of easy construction, the duration is short, cost is low Large area reinforced concrete floor to jump storehouse method job practices.
In order to realize the foregoing invention purpose, the technical scheme that job practices of the present invention adopts is following:
(1), divide the storehouse to be provided with
Construction should be avoided high stress areas setting " to jump the storehouse method ", and branch storehouse length is no more than 50m, divides storehouse plate construction rhythm to be >=7d.Construction roughly is divided into long and the wide zone that all is not more than 50m according to the plate area promptly " to jump the storehouse method ", and along arbitrary direction itemize numbering, the slab muscle can be arranged colligation in order successively according to construction, and concrete casting is jumped the storehouse and carried out.
(2), concrete mix screening
Former materials such as cement, sand, stone, flyash, breeze are screened; Through reducing cement consumption, reduce water/binder ratio, control the slump well; In the proper extension initial setting time, slump and initial setting time all are that the concrete to different brackets has different requirement inside the concrete construction standard.Be that board concrete strength grade among the present invention is C30, fly ash reduces cement consumption, reduces water/binder ratio, controls the slump well, the proper extension initial setting time.
(3), reinforcing bar binding
The slab muscle is not done to break off and is handled by normal slab muscle binding method construction.Be the common treatment of construction joints method that adopts between 9m, the 15m laminate piecemeal, the every side of plate constuction joint is established " fast easy-to-closing net ", should " fast easy-to-closing net " be the web-shaped product of directly buying on the market, and purpose is to prevent that concrete from flowing into an other side.The slab muscle is not done to break off and is handled by normal slab muscle binding method construction
(4), constuction joint setting
Adopt common treatment of construction joints method between the floor piecemeal, the every side of plate constuction joint is established " fast easy-to-closing net ", prevents that concrete from flowing into an other side.The cleaning of new-old concrete joint face is very important, must water cement paste at joint face before the filling as placed concrete, and is tight to guarantee joint face.When being 9m, 15m laminate jumping storehouse placing of concrete, the cleaning of new-old concrete joint face is very important, must water cement paste at joint face before the filling as placed concrete, and is tight to guarantee joint face.
(5), concrete construction
Placing of concrete adopts the job practices on " inclined-plane, continuous pouring, once arrive top ", i.e. concreting one-time-reach-place, and the concrete surface slope is 1: 6; Before the concrete initial set, the iron roller roll extrusion is used on the surface, and the enhanced surface density is treated to rub flat being no less than three times with the hands with wood float after concrete is received water, to eliminate the early-age plastic shrinkage crack of concrete surface layer.Be that placing of concrete adopts the job practices on " inclined-plane, continuous pouring, once arrive top ", the concrete surface slope is 1: 6; Before the concrete initial set, the iron roller roll extrusion is used on the surface, and the enhanced surface density is treated to rub flat being no less than three times with the hands with wood float after concrete is received water, to eliminate the early-age plastic shrinkage crack of concrete surface layer.
(6), maintenance
The heat and moisture preserving maintenance is of crucial importance, good maintenance for reduce concrete shrinkage, control internal-external temperature difference, to reduce shrinkage stress very important.Can adopt water storing conservation when weather conditions are better, when summer, atmospheric temperature was higher, should after the compacting of wiping one's face, cover layer of plastic film immediately, prevent that surperficial dehydration is dry and cracked.Be that the heat and moisture preserving maintenance is of crucial importance; Good maintenance for reduce concrete shrinkage, control internal-external temperature difference, to reduce shrinkage stress very important; Can adopt water storing conservation when weather conditions are better; When summer, atmospheric temperature was higher, should after the compacting of wiping one's face, cover layer of plastic film immediately, prevent that surperficial dehydration is dry and cracked.
(7), thermometric and test block are kept somewhere
Strengthen the indwelling of concrete thermometric work and test block, in time grasp temperature difference between inside and outside concrete and change and the concrete strength growth pattern.Promptly strengthen the indwelling of concrete thermometric work and test block, in time grasp temperature difference between inside and outside concrete and change and the concrete strength growth pattern.
Compare with existing construction technology; Good effect of the present invention is: eliminate above-mentioned unfavorable factor basically, and can fully discharge concrete thermal stresses and drying shrinkage stress, guarantee that floor quality adopts " jumping the storehouse method " pouring large tracts of land floorslab concrete; Can control the crack effect effectively; Easy construction, reduction of erection time, reduction cost, reliable in quality, and the present invention can also fully discharge concrete thermal stresses and drying shrinkage stress, guarantees that floor quality adopts " jumping the storehouse method " pouring large tracts of land floorslab concrete; Can control the crack effect effectively, easy construction, reduction of erection time, reduction cost, reliable in quality.
Description of drawings
Fig. 1 is that concrete joint is handled sketch map among the present invention;
Fig. 2 is an overhead laminate branch storehouse sketch map among the present invention;
Fig. 3 is pump truck position and a pump line layout plan among the present invention.
The specific embodiment
Below in conjunction with the specific embodiment foregoing invention content of the present invention is done further to describe in detail.
But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.Not breaking away under the above-mentioned technological thought situation of the present invention, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Specifically describe job practices of the present invention in conjunction with Fig. 1, Fig. 2, Fig. 3:
(1), " jump storehouse method " construction roughly is divided into long and the wide zone that all is not more than 50m according to the plate area, along arbitrary direction itemize numbering, the slab muscle can be arranged colligation in order successively according to construction, carry out in concrete casting jumping storehouse.
(2), the board concrete strength grade is C30, fly ash reduces cement consumption, reduces water/binder ratio, controls the slump well, the proper extension initial setting time.
(3), adopt common treatment of construction joints method between the 9m, 15m laminate piecemeal, the every side of plate constuction joint is established " fast easy-to-closing net ", prevents that concrete from flowing into an other side.The slab muscle is not done to break off and is handled by normal slab muscle binding method construction
(4), placing of concrete adopts the job practices on " inclined-plane, continuous pouring, once arrive top ", i.e. concreting one-time-reach-place, the concrete surface slope is 1: 6; Before the concrete initial set, the iron roller roll extrusion is used on the surface, and the enhanced surface density is treated to rub flat being no less than three times with the hands with wood float after concrete is received water, to eliminate the early-age plastic shrinkage crack of concrete surface layer.
(5), the heat and moisture preserving maintenance is of crucial importance; Good maintenance for reduce concrete shrinkage, control internal-external temperature difference, to reduce shrinkage stress very important; Can adopt water storing conservation when weather conditions are better; When summer, atmospheric temperature was higher, should after the compacting of wiping one's face, cover layer of plastic film immediately, prevent that surperficial dehydration is dry and cracked.
(6), strengthen the indwelling of concrete thermometric work and test block, in time grasp temperature difference between inside and outside concrete and change and the concrete strength growth pattern.
(7), when 9m, 15m laminate jump the storehouse placing of concrete, the cleaning of new-old concrete joint face is very important, must water cement paste at joint face before irritating as placed concrete, and is tight to guarantee joint face.
5) jump storehouse method construction precautions
(1), the overhead laminate area of 9m is big, in length and breadth to longer, receives the temperature difference influence of " expanding with heat and contract with cold " easily, causes stress distribution uneven and produce the crack;
(2), the contraction of 9m, 15m laminate concrete itself also is the one of the main reasons that possibly produce the crack.
(3), to fully pay attention to Influence of Temperature; Because 9m, 15m laminate are constructed on the occasion of high temperature season; Reinforcing bar after the colligation moulding is fixing receives temperature difference influence; Can produce bigger thermal stresses, not taking appropriate measures or in time discharging stress to make structure suffer ill-effect, as makes reinforcing bar generation torsional deformation and have influence on quality of concrete.
(4), large area concrete pouring construction; Except concrete requirement according to piecemeal; Notify the commercial concrete supplying unit ready ahead of time, project management department will confirm to build the date according to weather forecast and on-the-spot reality, carries out the outfit of the personnel's division of labor and the equipment that vibrates; Because the engineering time is long, concrete flat slab vibrator and make rod firm by ramming and will guarantee intact and sufficient spare unit.To assume unified command of during concreting, clearly build order, stop to occur cold seam.To note carrying out the quality of vibrating of board concrete especially, any carelessness vibrate (making the concrete leakiness) all will cause the plate seepage, cause anti-blocking difficulty in the future.
(5), in time carry out the insulation covering work of 9m, 15m laminate, unsuitable long term exposure particularly under the big situation of the temperature difference, causes concrete cracking easily.
Among Fig. 2, " jumping the storehouse method " divided the storehouse setting principle: the actual conditions of integrated structure design, avoid the high stress areas setting, and branch storehouse length is no more than 50m.
Claims (1)
1. a Large area reinforced concrete floor is jumped storehouse method job practices, it is characterized in that: method
Step is:
1., divide the storehouse to be provided with
Construction should be avoided high stress areas setting " to jump the storehouse method ", and branch storehouse length is no more than 50m, divides storehouse plate construction rhythm to be >=7d;
2., concrete mix screening
Cement, sand, stone, flyash, the former material of breeze are screened,, reduce water/binder ratio, control the slump and initial setting time well through reducing cement consumption;
3., reinforcing bar binding
The slab muscle is not done to break off and is handled by normal slab muscle binding method construction;
4., constuction joint setting
Adopt common treatment of construction joints method between the floor piecemeal, the every side of plate constuction joint is established the fast easy-to-closing net, prevents that concrete from flowing into an other side;
5., concrete construction
Placing of concrete adopts the job practices of one-time-reach-place, and the concrete surface slope is 1:6; Before the concrete initial set, the iron roller roll extrusion is used on the surface, and the enhanced surface density is treated to rub flat being no less than three times with the hands with wood float after concrete is received water, to eliminate the early-age plastic shrinkage crack of concrete surface layer;
6., maintenance
Adopt water storing conservation when weather conditions are better, should after the compacting of wiping one's face, cover layer of plastic film immediately when summer, atmospheric temperature was higher, prevent that surperficial dehydration is dry and cracked;
7., the indwelling of concrete thermometric work and test block.
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| CN2011100651210A CN102677898A (en) | 2011-03-17 | 2011-03-17 | Sequence construction method for large area reinforced concrete floors |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225406A (en) * | 2013-05-13 | 2013-07-31 | 中建五局第三建设有限公司 | Seamless construction method of multi-layer super large-area reinforced concrete ground |
| CN103628684A (en) * | 2013-12-12 | 2014-03-12 | 中国建筑第八工程局有限公司 | Construction method for casting floor slab and shear wall simultaneously |
| CN103669868A (en) * | 2013-12-30 | 2014-03-26 | 中国建筑第八工程局有限公司 | Recursive flow process construction method for ultra-long concrete floor structure |
| CN103711199A (en) * | 2013-12-19 | 2014-04-09 | 上海建工七建集团有限公司 | Method and structure for processing construction joints at large-section beam and column joints |
| CN104481149A (en) * | 2014-11-03 | 2015-04-01 | 中国建筑股份有限公司 | Super-large plane concrete structure seamless construction method using low-temperature cabin supplement method |
| CN106567463A (en) * | 2016-11-10 | 2017-04-19 | 上海宝冶集团有限公司 | Waferboard construction joint mortar leakage prevention construction method |
| CN106638998A (en) * | 2016-10-17 | 2017-05-10 | 中国建筑第八工程局有限公司 | Concrete vertical alternative bay construction method |
| CN109235891A (en) * | 2018-09-04 | 2019-01-18 | 中建八局第三建设有限公司 | A kind of Large Span Prestressed Beam concrete pitched roof jump storehouse method construction method |
| CN110306671A (en) * | 2019-06-03 | 2019-10-08 | 北京城建集团有限责任公司 | A kind of construction method of multiple arch shape closing structure |
| CN110528524A (en) * | 2019-09-06 | 2019-12-03 | 成都建工第一建筑工程有限公司 | Volume of concrete foundation unit cellular-type construction method |
| CN112412008A (en) * | 2020-10-12 | 2021-02-26 | 中如建工集团有限公司 | Seamless construction method for accurate slope finding of super-large concrete flat roof structure |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225406A (en) * | 2013-05-13 | 2013-07-31 | 中建五局第三建设有限公司 | Seamless construction method of multi-layer super large-area reinforced concrete ground |
| CN103628684A (en) * | 2013-12-12 | 2014-03-12 | 中国建筑第八工程局有限公司 | Construction method for casting floor slab and shear wall simultaneously |
| CN103711199B (en) * | 2013-12-19 | 2017-02-15 | 上海建工七建集团有限公司 | Method and structure for processing construction joints at large-section beam and column joints |
| CN103711199A (en) * | 2013-12-19 | 2014-04-09 | 上海建工七建集团有限公司 | Method and structure for processing construction joints at large-section beam and column joints |
| CN103669868B (en) * | 2013-12-30 | 2015-09-09 | 中国建筑第八工程局有限公司 | The recursion cross construction method of ultra-long concrete floor structure |
| CN103669868A (en) * | 2013-12-30 | 2014-03-26 | 中国建筑第八工程局有限公司 | Recursive flow process construction method for ultra-long concrete floor structure |
| CN104481149A (en) * | 2014-11-03 | 2015-04-01 | 中国建筑股份有限公司 | Super-large plane concrete structure seamless construction method using low-temperature cabin supplement method |
| CN104481149B (en) * | 2014-11-03 | 2017-06-06 | 中国建筑股份有限公司 | Using the super plane concrete structure seamless construction method of low temperature variation call method |
| CN106638998A (en) * | 2016-10-17 | 2017-05-10 | 中国建筑第八工程局有限公司 | Concrete vertical alternative bay construction method |
| CN106567463A (en) * | 2016-11-10 | 2017-04-19 | 上海宝冶集团有限公司 | Waferboard construction joint mortar leakage prevention construction method |
| CN106567463B (en) * | 2016-11-10 | 2019-03-15 | 上海宝冶集团有限公司 | Wafer board construction joint mortar leakage prevention construction method |
| CN109235891A (en) * | 2018-09-04 | 2019-01-18 | 中建八局第三建设有限公司 | A kind of Large Span Prestressed Beam concrete pitched roof jump storehouse method construction method |
| CN110306671A (en) * | 2019-06-03 | 2019-10-08 | 北京城建集团有限责任公司 | A kind of construction method of multiple arch shape closing structure |
| CN110528524A (en) * | 2019-09-06 | 2019-12-03 | 成都建工第一建筑工程有限公司 | Volume of concrete foundation unit cellular-type construction method |
| CN112412008A (en) * | 2020-10-12 | 2021-02-26 | 中如建工集团有限公司 | Seamless construction method for accurate slope finding of super-large concrete flat roof structure |
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Application publication date: 20120919 |