CN101343947A - Mass concrete construction method - Google Patents
Mass concrete construction method Download PDFInfo
- Publication number
- CN101343947A CN101343947A CNA2008101507395A CN200810150739A CN101343947A CN 101343947 A CN101343947 A CN 101343947A CN A2008101507395 A CNA2008101507395 A CN A2008101507395A CN 200810150739 A CN200810150739 A CN 200810150739A CN 101343947 A CN101343947 A CN 101343947A
- Authority
- CN
- China
- Prior art keywords
- concrete
- initial setting
- minimum initial
- setting time
- mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to a bulk concrete construction method. The bulk concrete construction method is characterized in that the following steps are included: firstly, the pouring method of the bulk concrete is determined according to the power of an agitating machine and a pumping machine on site; secondly, the minimum initial setting time required by concrete is determined according to the maximum poured concrete quantity at a time; thirdly, the variety of cement is determined according to the heat engineering calculation; fourthly, the mixed quantity of highly efficient slow setting water reducing agent is determined according to the minimum initial setting time; fifthly, the mixture ratio experiment of the concrete is performed; and sixthly, an awning is set up when the concrete is poured, so as to avoid cracks occurred due to quick water loss on the concrete surface. The highly efficient slow setting water reducing agent is mixed in the concrete to ensure that the minimum initial setting time of the concrete is longer than the pouring time of each layer. Five faces of the awning are enclosed, and ventilation, illuminating and heating facilities are required. The invention can meet the requirements of the construction of agitating the bulk concrete centralized at the site far away from a commercial concrete agitating station, so the occurrence of cracks in a bulk concrete structure is effectively avoided.
Description
Technical field
The present invention establishes the job practices that relates to a kind of concrete in mass.
Background technology
Volume of concrete foundation is used more and more in substation project in recent years.It is bigger influenced by rain erosion, sun direct projection etc. outside transformer station's volume of concrete foundation is exposed to throughout the year.Simultaneously, high height above sea level, cold district are because ultraviolet ray is strong, day and night temperature is big, annual range of temperature changes and waits greatly to the quality influence of concrete in mass very greatly.The crack often appears in volume of concrete foundation, and is very big to the safe operation influence of transformer station.
The transformer station many places are in the rural area away from the city, and commodity in use concrete difficulty is very big, can only take the on-the-spot job practices of concentrating stirring pumping.Limited by field condition, the concrete initial setting time that routine is mixed system can't be satisfied the requirement of building of concrete in mass, very easily forms the crack.
Summary of the invention
The objective of the invention is to provides a kind of on-the-spot centralized mixing, pumping concrete construction method for high height above sea level, cold district mass concrete construction, with the appearance in control volume of concrete foundation crack, guarantee the quality of high height above sea level, cold district volume of concrete foundation.
For achieving the above object, technical scheme of the present invention is: a kind of job practices of concrete in mass may further comprise the steps:
(1) determines the pouring procedure of concrete in mass according to the power of the Mixing Machine at scene and pumping machine;
(2) determine the minimum initial setting time that concrete is required according to the concrete quantity of maximum single cast;
(3) calculate definite cement type according to the thermal technology;
(4) determine the volume of efficient retardation water reducing agent according to the minimum initial setting time;
(5) carry out the concrete mix experiment;
(6) set up sunshade during concreting, avoid the too fast crack that occurs of concrete surface dehydration.
Mixing efficient retardation water reducing agent in concrete makes the concrete minimum initial setting time build the time greater than every layer.
The sunshade five-surfac airtight will have ventilation, illumination, heating facility.
Effect of the present invention: the present invention can satisfy away from the on-the-spot construction of concentrating the stirring concrete in mass in commercial concrete agitator area, prevents that effectively the crack from appearring in large volume concrete structural.Guarantee the quality of high height above sea level, cold district volume of concrete foundation.
Below in conjunction with the specific embodiment the present invention is described in further detail.
The specific embodiment:
Embodiment 1
Carry out the construction of certain 750KVGIS of transformer station volume of concrete foundation, this basis total length 138.35m, wide contain local outstanding be 46.8 meters.Embedded depth of foundation-1.50m, 100mm bassets.The base concrete strength grade adopts C30, and the total side of concrete amount contains concrete mats 6650m
3Ater-casting, 7 road is established in design altogether, and the construction time-division builds for eight times, and the single maximum amount of building is 990m
3Step is as follows: (1) calculates the transmission and concrete transmission ability: site pumping equipment is a PLD1200 concrete pump, and the maximum outlet pressure of concrete pump is 11Mpa.As calculated: concrete pump fed distance farthest is 652.6 meters, and the real standard characteristic chamber length of concrete carrier pipe is 237 meters, so the concrete pump fed distance satisfies field requirement.Calculating the conveyance conduit pressure drop is 1.38Mpa, much smaller than the maximum outlet pressure 11Mpa of concrete pump, therefore coagulates native delivery pump discharge pressure and meets the demands.(2) according to PLD1200 type concrete pumping plant 20 cubes load per hour, to have taken all factors into consideration unfavorable factor and calculated, it is 49.5 hours that maximum construction section concrete is built total time spent.Lift height during in conjunction with the regulation and stipulation placement layer by layer is not less than the requirement of 30cm, concrete divides four layers to build, build 12.4 hours times spent for every layer, therefore consider the requirement that layer concrete must cover on the difference of on-the-spot actual environment and experimental situation and lower-layer concrete were before initial set, the concrete initial set time was defined as greater than 14 hours.(3) meteorological data during the location concreting of collection engineering and selected various cement kind are carried out thermal technology's calculating, select the P.MH42.5 level moderate-heat portland cement of Qinghai cement joint stock company limited production by contrast.(4) determine the volume of efficient retardation water reducing agent according to the minimum initial setting time: be requirement according to the concrete initial set time greater than 14 hours, the efficient retardation water reducing agent of many families is tested contrast, and selecting the naphthalene of the Yellow River, Xining, Qinghai Admixture factory is the efficient retardation water reducing agent of UNF-2C.(5) carry out concrete mix experiment: cooperate to have a competition in the laboratory and join, the examination timing adds flyash and expansion agent as cloud aluminite, to solve concrete workability and the compensation concrete in mass shrinks the shrinkage stress that causes.By repeatedly the examination join, final test match ratio is as follows:
C30 match ratio: every cubic metre of concrete consumption Kg
| Cement (kg) | Water (kg) | Sand (kg) | Stone (kg) | Flyash (kg) | Expansion agent (cloud aluminite) (kg) | Efficient retardation water reducing agent (kg) |
| 346 | 170 | 696 | 1135 | 27 | 17 | 3.46 |
(6) set up sunshade during concreting: owing to be located in high height above sea level, cold district, day and night temperature is big, and ultraviolet ray is strong.For avoiding the sunlight direct projection to cause of the influence of the too fast and day and night temperature of concrete surface dehydration, when construction, set up sunshade to facing concrete.Sunshade is set up keel with scaffold tube, goes along with sb. to guard him with five coverings of paulin.
Claims (3)
1. the job practices of a concrete in mass is characterized in that may further comprise the steps:
(1) determines the pouring procedure of concrete in mass according to the power of the Mixing Machine at scene and pumping machine;
(2) determine the minimum initial setting time that concrete is required according to the concrete quantity of maximum single cast;
(3) calculate definite cement type according to the thermal technology;
(4) determine the volume of efficient retardation water reducing agent according to the minimum initial setting time;
(5) carry out the concrete mix experiment;
(6) set up sunshade during concreting, avoid the too fast crack that occurs of concrete surface dehydration.
2. according to the job practices of right 1 described a kind of concrete in mass, it is characterized in that: in concrete, mix efficient retardation water reducing agent and make the concrete minimum initial setting time build the time greater than every layer.
3. according to the job practices of right 1 described a kind of concrete in mass, it is characterized in that: the sunshade five-surfac airtight will have ventilation, illumination, heating facility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101507395A CN101343947A (en) | 2008-08-21 | 2008-08-21 | Mass concrete construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101507395A CN101343947A (en) | 2008-08-21 | 2008-08-21 | Mass concrete construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101343947A true CN101343947A (en) | 2009-01-14 |
Family
ID=40246053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101507395A Pending CN101343947A (en) | 2008-08-21 | 2008-08-21 | Mass concrete construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101343947A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296819A (en) * | 2011-06-15 | 2011-12-28 | 四川路桥建设股份有限公司 | Construction method for mass pipe concrete without temperature reduction |
| CN103161305A (en) * | 2013-04-09 | 2013-06-19 | 云南建工水利水电建设有限公司 | Construction method of super-thick concrete roof |
| CN104631831A (en) * | 2015-01-16 | 2015-05-20 | 河海大学 | Construction method capable of preventing large-size concrete from generating temperature cracks after construction is stopped |
| CN108842795A (en) * | 2018-08-06 | 2018-11-20 | 中交二航局第四工程有限公司 | A kind of bottom sealing method of bottomless steel cofferdam |
| CN110981256A (en) * | 2019-12-18 | 2020-04-10 | 竹鹏翔 | Preparation method of admixture for high-performance concrete in severe cold plateau area |
| CN112177001A (en) * | 2020-09-18 | 2021-01-05 | 中国三峡建设管理有限公司 | Method for improving construction efficiency of large-volume concrete pouring by dragging or overturning mold |
-
2008
- 2008-08-21 CN CNA2008101507395A patent/CN101343947A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296819A (en) * | 2011-06-15 | 2011-12-28 | 四川路桥建设股份有限公司 | Construction method for mass pipe concrete without temperature reduction |
| CN102296819B (en) * | 2011-06-15 | 2013-10-16 | 四川路桥建设股份有限公司 | Construction method for mass pipe concrete without temperature reduction |
| CN103161305A (en) * | 2013-04-09 | 2013-06-19 | 云南建工水利水电建设有限公司 | Construction method of super-thick concrete roof |
| CN103161305B (en) * | 2013-04-09 | 2016-01-20 | 云南建工第三建设有限公司 | A kind of construction method of super-thick concrete roof |
| CN104631831A (en) * | 2015-01-16 | 2015-05-20 | 河海大学 | Construction method capable of preventing large-size concrete from generating temperature cracks after construction is stopped |
| CN104631831B (en) * | 2015-01-16 | 2017-01-11 | 河海大学 | Construction method capable of preventing large-size concrete from generating temperature cracks after construction is stopped |
| CN108842795A (en) * | 2018-08-06 | 2018-11-20 | 中交二航局第四工程有限公司 | A kind of bottom sealing method of bottomless steel cofferdam |
| CN110981256A (en) * | 2019-12-18 | 2020-04-10 | 竹鹏翔 | Preparation method of admixture for high-performance concrete in severe cold plateau area |
| CN112177001A (en) * | 2020-09-18 | 2021-01-05 | 中国三峡建设管理有限公司 | Method for improving construction efficiency of large-volume concrete pouring by dragging or overturning mold |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101343947A (en) | Mass concrete construction method | |
| CN103723968B (en) | Nuclear power station PX pump house volute pump structure is with concrete and build the method for moulding | |
| CN104230373A (en) | Autoclaved aerated concrete block and manufacturing method thereof | |
| CN105133615A (en) | Circulating cooling water temperature-control construction method for mass concrete in large temperature difference environments of Qinghai-Tibet plateau areas | |
| CN104311106A (en) | Autoclaved aerated concrete plate and preparation method thereof | |
| CN103708786B (en) | Thermal insulation concrete and production method thereof | |
| CN103556830A (en) | Controllable cast-in-place foam concrete roof construction method | |
| CN105401654A (en) | Environment-friendly assembled type ecological house and construction method thereof | |
| CN104496321B (en) | A kind of tapping pipe and preparation method thereof | |
| CN104086215B (en) | A kind of foamed concrete material and construction technology | |
| CN104310926A (en) | Autoclaved aerated concrete plate prepared by utilizing ceramic polishing waste material and preparation method of autoclaved aerated concrete plate | |
| CN104310925A (en) | Autoclaved aerated concrete building block prepared by utilizing ceramic polishing waste material and preparation method of autoclaved aerated concrete building block | |
| CN105733382A (en) | Micro-nano reinforcing steel bar anti-rusting agent for autoclaved aerated concrete slab and preparation method of micro-nano reinforcing steel bar anti-rusting agent | |
| CN106368312A (en) | Modular house | |
| CN102531664A (en) | Fluorgypsum hollow building block and preparation method thereof | |
| CN102584328A (en) | Building block reinforced by stone powder and ceramic particles and preparation method thereof | |
| CN105201101A (en) | Light aggregate concrete small hollow block building masonry construction method | |
| CN102898088A (en) | Heat-insulation sound-insulation light-weight high-strength aerated concrete building block and producing method thereof | |
| CN107435417A (en) | Roofing foam concrete construction | |
| CN102674759A (en) | EPS (Expandable Polystyrene) light aggregate concrete thermal insulation hollow block and construction method thereof | |
| CN105735546A (en) | Construction method for constructing light-steel house roof with industrial by-product gypsum as binding material | |
| CN103570300A (en) | Recycled concrete tile and preparation method thereof | |
| CN110469113A (en) | A kind of self-compact concrete in construction method under hot conditions | |
| CN207206709U (en) | Steam recycling device | |
| CN103498557A (en) | Method for controlling crack of fiber reinforced concrete wall |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090114 |