CN103485370B - A kind of concrete construction control method preventing wallboard harmful cracks - Google Patents
A kind of concrete construction control method preventing wallboard harmful cracks Download PDFInfo
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- CN103485370B CN103485370B CN201310442060.4A CN201310442060A CN103485370B CN 103485370 B CN103485370 B CN 103485370B CN 201310442060 A CN201310442060 A CN 201310442060A CN 103485370 B CN103485370 B CN 103485370B
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Abstract
The present invention relates to a kind of concrete construction control method preventing wallboard harmful cracks, comprising: (1) determines concrete initial set time t; (2) according to required initial setting time t, suitable cement type, execution conditions and Admixture is selected to allocate suitable construction concrete; (3) carry out concreting from in-plane, first by constuction joint position, whole works area is divided into 3 subregions, and constructs in order successively; (4) carry out concreting from vertical direction, by absolute altitude-4.04m be starting point to absolute altitude 0.84m, whole construction section is divided into 2 Ge Fen workshop sections, successively according to the construction of 1 point of workshop section → 2 point workshop section.Compared with prior art, the present invention can save the duration, wallboard outboard template can be done sth. in advance like this to remove to work to tight deadlines, allow R.C. wall board under moistening environment slowly complete shrinkage strain, effectively prevent because in advance form removal causes temperature difference between inside and outside concrete to produce temperature difference crack.
Description
Technical field
The present invention relates to a kind of concrete construction method, especially relate to a kind of concrete construction control method preventing basement wall slab harmful cracks.
Background technology
Transformer station's basement basis is with R.C. wall board work progress, concreting is progressively carried out, and after the concrete setting of formerly building, then carries out new concreting, between the concrete interface of first after-pouring, define gap like this, be referred to as constuction joint.Constuction joint arranges the existence lower than long-term groundwater table, 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 position of wallboard etc., at the position that the Dou Shi crack, position that sectional dimension is undergone mutation easily produces.
Most crack is out of shape deficiency due to concrete tensile strength and tension and causes, and caused by distortion according to measuring and calculating 80% crack, what directly caused by load only accounts for 20%.At crack (unstructuredness) the width < 0.05mm that basement wall slab occurs on can self-healing when using that impact is little, the crack hydraulic head of 0.1 ~ 0.2mm is not high, and the most serious in the consequence that crack produces be exactly seepage.If continue development again to go down, the situation of seepage may be there is.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of concrete construction control method preventing basement wall slab harmful cracks is provided.
Object of the present invention can be achieved through the following technical solutions: a kind of concrete construction control method preventing wallboard harmful cracks, is characterized in that, comprise the following steps:
(1) concrete initial set time t is determined;
(2) according to required initial setting time t, suitable cement type, execution conditions and Admixture is selected to allocate suitable construction concrete;
(3) concreting is carried out from in-plane, first by constuction joint position, whole works area is divided into 3 subregions, and constructs according to the order of 1 sole plate → 1 district of district grade beam → 2 district sole plate, grade beam → 2 district of sole plate → 3 district of wallboard → 3 district of beam → 1 district wallboard → 3 district wallboard successively;
(4) concreting is carried out from vertical direction, be that starting point is to absolute altitude 0.84m by absolute altitude-4.04m, whole construction section is divided into 2 Ge Fen workshop sections: 1 point of workshop section is that absolute altitude-4.04m is to absolute altitude-0.3m, 2 points of workshop sections be absolute altitude-0.3 to absolute altitude 0.84m, successively according to point workshop section's construction of 1 point of workshop section → 2.
Determination concrete initial set time concrete grammar described in step (1) is,
1) casting and compacting of concrete time t1:t1=(2 × h × H × b/ (i × M)) is calculated, wherein h is every layer and builds thickness, and H is concrete bottom plate thickness, and b is casting and compacting of concrete width, i is the concrete trickling gradient, and M is pumping of concrete amount per hour;
2) add up concrete and be transported to on-the-spot haulage time t2 from pumping plant;
3) initial setting time t:t >=t1+t2 needed for concrete is obtained according to t1 and t2.
Described in step (3) to the construction of 2nd district time, first arrange expansion reinforcing band 2m in position, former ater-casting, close hole gauze wire cloth is established in band both sides, and reinforces with short muscle and fixing; Again with mixing 0.9Kg/m
3the little expansive concrete of poly-third vinyl fiber is built 2nd district, when watering to reinforcing band, with mixing 0.9Kg/m
3the large expansive concrete of poly-third vinyl fiber and 12%HEA is built reinforcing band, and band inner concrete intensity improves 5Mpa than both sides, can prevent the concrete first poured into a mould from flowing in reinforcing band to cause and build the concrete honeycomb in side and pitted skin defect.
Compared with prior art, the present invention can save the duration, wallboard outboard template can be done sth. in advance like this to remove to work to tight deadlines, allow R.C. wall board under moistening environment slowly complete shrinkage strain, effectively prevent because in advance form removal causes temperature difference between inside and outside concrete to produce temperature difference crack.
Accompanying drawing explanation
Fig. 1 is that embodiment of the present invention concrete of basement builds precedence diagram.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present embodiment is built for 220kV and 110kV power distribution equipment building concrete of basement, and as shown in Figure 1, a kind of concrete construction control method preventing wallboard harmful cracks, is characterized in that, comprise the following steps:
(1) concrete initial set time t is determined;
(2) according to required initial setting time t, suitable cement type, execution conditions and Admixture is selected to allocate suitable construction concrete;
(3) carry out concreting from in-plane, first pass through by constuction joint position
whole works area carries out being divided into 3 subregions by number line, wherein, 1. ~ be 8. 1st district, and 8. ~ be 9. 2nd district,
be 3rd district, and construct according to the order of 1 sole plate → 1 district of district grade beam → 2 district sole plate, grade beam → 2 district of sole plate → 3 district of wallboard → 3 district of beam → 1 district wallboard → 3 district wallboard successively;
(4) concreting is carried out from vertical direction, be that starting point is to absolute altitude 0.84m by absolute altitude-4.04m, whole construction section is divided into 2 Ge Fen workshop sections: 1 point of workshop section is that absolute altitude-4.04m is to absolute altitude-0.3m, 2 points of workshop sections be absolute altitude-0.3 to absolute altitude 0.84m, successively according to point workshop section's construction of 1 point of workshop section → 2.
Determination concrete initial set time concrete grammar described in step (1) is,
1) casting and compacting of concrete time t1:t1=(2 × h × H × b/ (i × M)) is calculated, wherein h is every layer and builds thickness, and H is concrete bottom plate thickness, and b is casting and compacting of concrete width, i is the concrete trickling gradient, and M is pumping of concrete amount per hour;
2) add up concrete and be transported to on-the-spot haulage time t2 from pumping plant;
3) initial setting time t:t >=t1+t2 needed for concrete is obtained according to t1 and t2.
Described in step (3) to the construction of 2nd district time, first arrange expansion reinforcing band 2m in position, former ater-casting, close hole gauze wire cloth is established in band both sides, and reinforces with short muscle and fixing; Again with mixing 0.9Kg/m
3the little expansive concrete of poly-third vinyl fiber is built 2nd district, when watering to reinforcing band, with mixing 0.9Kg/m
3the large expansive concrete of poly-third vinyl fiber and 12%HEA is built reinforcing band, and band inner concrete intensity improves 5Mpa than both sides, can prevent the concrete first poured into a mould from flowing in reinforcing band to cause and build the concrete honeycomb in side and pitted skin defect.
Claims (2)
1. prevent a concrete construction control method for wallboard harmful cracks, it is characterized in that, comprise the following steps:
(1) determine concrete initial set time t, concrete grammar is,
1) casting and compacting of concrete time t1:t1=(2 × h × H × b/ (i × M)) is calculated, wherein h is every layer and builds thickness, and H is concrete bottom plate thickness, and b is casting and compacting of concrete width, i is the concrete trickling gradient, and M is pumping of concrete amount per hour;
2) add up concrete and be transported to on-the-spot haulage time t2 from pumping plant;
3) initial setting time t:t >=t1+t2 needed for concrete is obtained according to t1 and t2;
(2) according to required initial setting time t, suitable cement type, execution conditions and Admixture is selected to allocate suitable construction concrete;
(3) concreting is carried out from in-plane, first by constuction joint position, whole works area is divided into 3 subregions, and constructs according to the order of 1 sole plate → 1 district of district grade beam → 2 district sole plate, grade beam → 2 district of sole plate → 3 district of wallboard → 3 district of beam → 1 district wallboard → 3 district wallboard successively;
(4) concreting is carried out from vertical direction, be that starting point is to absolute altitude 0.84m by absolute altitude-4.04m, whole construction section is divided into 2 Ge Fen workshop sections: 1 point of workshop section is that absolute altitude-4.04m is to absolute altitude-0.3m, 2 points of workshop sections be absolute altitude-0.3 to absolute altitude 0.84m, successively according to point workshop section's construction of 1 point of workshop section → 2.
2. a kind of concrete construction control method preventing wallboard harmful cracks according to claim 1, it is characterized in that, in described step (3), during to the construction of 2nd district, first expansion reinforcing band 2m is set in position, former ater-casting, close hole gauze wire cloth is established in band both sides, and reinforces with short muscle and fix; Again with mixing 0.9Kg/m
3the little expansive concrete of poly-third vinyl fiber is built 2nd district, when watering to reinforcing band, with mixing 0.9Kg/m
3the large expansive concrete of poly-third vinyl fiber and 12%HEA is built reinforcing band.
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Families Citing this family (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 |
| 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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| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5014932B2 (en) * | 2007-09-12 | 2012-08-29 | 西武ポリマ化成株式会社 | Joint structure of concrete structure and construction method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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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