CN103485370A - Concrete construction control method for preventing harmful cracks of wallboard - Google Patents
Concrete construction control method for preventing harmful cracks of wallboard Download PDFInfo
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- CN103485370A CN103485370A CN201310442060.4A CN201310442060A CN103485370A CN 103485370 A CN103485370 A CN 103485370A CN 201310442060 A CN201310442060 A CN 201310442060A CN 103485370 A CN103485370 A CN 103485370A
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Abstract
The invention relates to a concrete construction control method for preventing harmful cracks of a wallboard. The method includes: (1), determining initial setting time t of concrete; (2), selecting a suitable cement type, construction condition and construction concrete with appropriately dispensed additive agent according to the required initial setting time t; (3), concrete pouring from a plane direction, dividing a whole construction area into three subareas according to construction joint position, and performing construction sequentially; and (4), concrete pouring from a vertical direction, dividing the whole construction section into two subsections according to an elevation from minus 4.04m (metre) to 0.84m, and performing construction from a first subsection to a second subsection. Compared with the prior art, the method can shorten construction period, outside templates of the wallboard can not necessarily be removed in advance in order to meet the deadline of construction, and therefore, wallboard concrete can complete contraction distortion slowly under a humid environment, temperature difference cracks caused by temperature difference inside and outside the concrete resulting from removing the templates in advance are effectively prevented.
Description
Technical field
The present invention relates to a kind of concrete construction method, especially relate to a kind of concrete construction control method that prevents basement wallboard harmful cracks.
Background technology
In transformer station's basement basis and R.C. wall board work progress, concreting is progressively carried out, and after the concrete setting of formerly building, then carries out new concreting, so formerly between the concrete interface of after-pouring, form gap, be referred to as constuction joint.Constuction joint arranges lower than the existence of groundwater table throughout the year, for the infiltration of water provides passage.Be exactly abrupt change of cross-section place in addition, as grade beam and this variable cross-section of wallboard position etc., the position that the Dou Shi crack, position of undergoing mutation in sectional dimension easily produces.
Most crack is due to concrete tensile strength and the tension distortion is not enough causes, according to measuring and calculating 80% crack, by distortion, caused, what directly by load, caused only accounts for 20%.The crack (unstructuredness) occurred at the basement wallboard but width<0.05mm is on being used that impact is little, self-healing when not high of the crack hydraulic head of 0.1～0.2mm, and the most serious in the consequence that crack produces be exactly seepage.Go down if continue again development, the situation of seepage may occur.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of concrete construction control method that prevents basement wallboard harmful cracks in order to overcome the defect that above-mentioned prior art exists.
Purpose of the present invention can be achieved through the following technical solutions: a kind of concrete construction control method that prevents the wallboard harmful cracks, it is characterized in that, and comprise the following steps:
(1) determine concrete initial set time t;
(2), according to required initial setting time t, select suitable cement type, execution conditions and Admixture to allocate suitable construction concrete;
(3) carry out concreting from in-plane, first by the constuction joint position, whole works area is divided into to 3 subregions, and is constructed according to the order of 1 district's sole plate → 1 district's grade beam → 2 district's sole plates, beam → 1 district's wallboard → 3 district's sole plates → 3 district's grade beams → 2 district's wallboards → 3 district's wallboards successively;
(4) carry out concreting from vertical direction, by absolute altitude-4.04m, be that starting point is to absolute altitude 0.84m, whole construction section is divided into to 2 minutes workshop sections: 1 minute workshop section is that absolute altitude-4.04m is to absolute altitude-0.3m, 2 minutes workshop sections are that absolute altitude-0.3 is to absolute altitude 0.84m, successively according to workshop section → 2 minute workshop section's construction in 1 minute.
The described definite concrete initial set time concrete grammar of step (1) is,
1) calculate casting and compacting of concrete time t1:t1=(2 * h * H * b/ (i * M)), wherein h is every layer and builds thickness, and H is the concrete bottom plate thickness, and b is the casting and compacting of concrete width, and i is the concrete trickling gradient, and M is pumping of concrete amount per hour;
2) the statistics concrete is transported to on-the-spot haulage time t2 from pumping plant;
3) obtain the required initial setting time t:t >=t1+t2 of concrete according to t1 and t2.
Step (3) is described first arranges expansion reinforcing band 2m in position, former ater-casting to 2 districts whens construction, band She Mi hole, both sides gauze wire cloth, and reinforce and fix with short muscle; Again with mixing 0.9Kg/m
3the little expansive concrete of poly-the third vinyl fiber is built 2nd district, when watering to reinforcing band, with mixing 0.9Kg/m
3the large expansive concrete of poly-the third vinyl fiber and 12%HEA is built reinforcing band, and band inner concrete intensity improves 5Mpa than both sides, can prevent that the concrete of first pouring into a mould from flowing in reinforcing band and cause and build the concrete honeycomb of side and pitted skin defect.
Compared with prior art, the present invention can save the duration, can do sth. in advance in order to work to tight deadlines like this wallboard outboard template is removed, allow R.C. wall board under moistening environment slowly complete shrinkage strain, effectively prevent from producing temperature difference crack because form removal in advance causes temperature difference between inside and outside concrete.
The accompanying drawing explanation
Fig. 1 is that embodiment of the present invention concrete of basement is built precedence diagram.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present embodiment is built as example with 220kV and 110kV power distribution equipment building concrete of basement, and as shown in Figure 1, a kind of concrete construction control method that prevents the wallboard harmful cracks, is characterized in that, comprises the following steps:
(1) determine concrete initial set time t;
(2), according to required initial setting time t, select suitable cement type, execution conditions and Admixture to allocate suitable construction concrete;
(3) carry out concreting from in-plane, first pass through by the constuction joint position
number line is divided into 3 subregions by whole works area, and wherein, 1.～8. be 1st district, and 8.～9. be 2nd district, and
be 3rd district, and constructed according to the order of 1 district's sole plate → 1 district's grade beam → 2 district's sole plates, beam → 1 district's wallboard → 3 district's sole plates → 3 district's grade beams → 2 district's wallboards → 3 district's wallboards successively;
(4) carry out concreting from vertical direction, by absolute altitude-4.04m, be that starting point is to absolute altitude 0.84m, whole construction section is divided into to 2 minutes workshop sections: 1 minute workshop section is that absolute altitude-4.04m is to absolute altitude-0.3m, 2 minutes workshop sections are that absolute altitude-0.3 is to absolute altitude 0.84m, successively according to workshop section → 2 minute workshop section's construction in 1 minute.
The described definite concrete initial set time concrete grammar of step (1) is,
1) calculate casting and compacting of concrete time t1:t1=(2 * h * H * b/ (i * M)), wherein h is every layer and builds thickness, and H is the concrete bottom plate thickness, and b is the casting and compacting of concrete width, and i is the concrete trickling gradient, and M is pumping of concrete amount per hour;
2) the statistics concrete is transported to on-the-spot haulage time t2 from pumping plant;
3) obtain the required initial setting time t:t >=t1+t2 of concrete according to t1 and t2.
Step (3) is described first arranges expansion reinforcing band 2m in position, former ater-casting to 2 districts whens construction, band She Mi hole, both sides gauze wire cloth, and reinforce and fix with short muscle; Again with mixing 0.9Kg/m
3the little expansive concrete of poly-the third vinyl fiber is built 2nd district, when watering to reinforcing band, with mixing 0.9Kg/m
3the large expansive concrete of poly-the third vinyl fiber and 12%HEA is built reinforcing band, and band inner concrete intensity improves 5Mpa than both sides, can prevent that the concrete of first pouring into a mould from flowing in reinforcing band and cause and build the concrete honeycomb of side and pitted skin defect.
Claims (3)
1. a concrete construction control method that prevents the wallboard harmful cracks, is characterized in that, comprises the following steps:
(1) determine concrete initial set time t;
(2), according to required initial setting time t, select suitable cement type, execution conditions and Admixture to allocate suitable construction concrete;
(3) carry out concreting from in-plane, first by the constuction joint position, whole works area is divided into to 3 subregions, and is constructed according to the order of 1 district's sole plate → 1 district's grade beam → 2 district's sole plates, beam → 1 district's wallboard → 3 district's sole plates → 3 district's grade beams → 2 district's wallboards → 3 district's wallboards successively;
(4) carry out concreting from vertical direction, by absolute altitude-4.04m, be that starting point is to absolute altitude 0.84m, whole construction section is divided into to 2 minutes workshop sections: 1 minute workshop section is that absolute altitude-4.04m is to absolute altitude-0.3m, 2 minutes workshop sections are that absolute altitude-0.3 is to absolute altitude 0.84m, successively according to workshop section → 2 minute workshop section's construction in 1 minute.
2. a kind of concrete construction control method that prevents the wallboard harmful cracks according to claim 1, is characterized in that, the described definite concrete initial set time concrete grammar of step (1) is,
1) calculate casting and compacting of concrete time t1:t1=(2 * h * H * b/ (i * M)), wherein h is every layer and builds thickness, and H is the concrete bottom plate thickness, and b is the casting and compacting of concrete width, and i is the concrete trickling gradient, and M is pumping of concrete amount per hour;
2) the statistics concrete is transported to on-the-spot haulage time t2 from pumping plant;
3) obtain the required initial setting time t:t >=t1+t2 of concrete according to t1 and t2.
3. a kind of concrete construction control method that prevents the wallboard harmful cracks according to claim 1, it is characterized in that, step (3) is described to 2 districts whens construction, first in position, former ater-casting, expansion reinforcing band 2m is set, band She Mi hole, both sides gauze wire cloth, and reinforce and fix with short muscle; Again with mixing 0.9Kg/m
3the little expansive concrete of poly-the third vinyl fiber is built 2nd district, when watering to reinforcing band, with mixing 0.9Kg/m
3the large expansive concrete of poly-the third vinyl fiber and 12%HEA is built reinforcing band.
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| CN201310442060.4A CN103485370B (en) | 2013-09-24 | 2013-09-24 | A kind of concrete construction control method preventing wallboard harmful cracks |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866789A (en) * | 2014-03-19 | 2014-06-18 | 重庆大学 | Control method for cracks generated during construction period of basement baseboard |
| CN106894446A (en) * | 2017-03-07 | 2017-06-27 | 湖南城市学院 | Super-long Basement jointless structure construction method |
| CN112252492A (en) * | 2020-09-24 | 2021-01-22 | 中建四局第六建设有限公司 | Construction method and structure of anti-crack structure reinforcing belt for concrete building |
| CN112627527A (en) * | 2020-12-11 | 2021-04-09 | 上海宝冶集团有限公司 | Partition number dividing method convenient for field construction management |
| CN112982654A (en) * | 2021-03-02 | 2021-06-18 | 中铁十一局集团西安建设有限公司 | Method for measuring initial setting time of concrete |
| CN114277840A (en) * | 2021-12-22 | 2022-04-05 | 珠海华发人居生活研究院有限公司 | Construction method for reducing post-cast strip setting and controlling harmful cracks of concrete |
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| CN1455054A (en) * | 2003-05-08 | 2003-11-12 | 中国第二十冶金建设公司 | Ordinary concrete block bunker-jump casting crack control method |
| JP2009068217A (en) * | 2007-09-12 | 2009-04-02 | Seibu Polymer Corp | Joint structure of concrete structure and method of constructing the same |
| CN101831921A (en) * | 2010-05-12 | 2010-09-15 | 江苏兴厦建筑安装有限公司 | Construction method of expansive concrete |
| CN102235091A (en) * | 2010-04-22 | 2011-11-09 | 上海市第七建筑有限公司 | Construction method for ultralong concrete structure |
| CN102425307A (en) * | 2011-10-19 | 2012-04-25 | 江苏瑞峰建设集团有限公司 | Casting method for avoiding formation of mass concrete cracks |
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| CN1455054A (en) * | 2003-05-08 | 2003-11-12 | 中国第二十冶金建设公司 | Ordinary concrete block bunker-jump casting crack control method |
| JP2009068217A (en) * | 2007-09-12 | 2009-04-02 | Seibu Polymer Corp | Joint structure of concrete structure and method of constructing the same |
| CN102235091A (en) * | 2010-04-22 | 2011-11-09 | 上海市第七建筑有限公司 | Construction method for ultralong concrete structure |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866789A (en) * | 2014-03-19 | 2014-06-18 | 重庆大学 | Control method for cracks generated during construction period of basement baseboard |
| CN106894446A (en) * | 2017-03-07 | 2017-06-27 | 湖南城市学院 | Super-long Basement jointless structure construction method |
| CN106894446B (en) * | 2017-03-07 | 2019-04-02 | 湖南城市学院 | Super-long Basement jointless structure construction method |
| CN112252492A (en) * | 2020-09-24 | 2021-01-22 | 中建四局第六建设有限公司 | Construction method and structure of anti-crack structure reinforcing belt for concrete building |
| CN112627527A (en) * | 2020-12-11 | 2021-04-09 | 上海宝冶集团有限公司 | Partition number dividing method convenient for field construction management |
| CN112982654A (en) * | 2021-03-02 | 2021-06-18 | 中铁十一局集团西安建设有限公司 | Method for measuring initial setting time of concrete |
| CN114277840A (en) * | 2021-12-22 | 2022-04-05 | 珠海华发人居生活研究院有限公司 | Construction method for reducing post-cast strip setting and controlling harmful cracks of concrete |
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| CN103485370B (en) | 2016-01-06 |
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