CN101503915B - Construction method for ultra-large area, ultra-thin non-agglutination pre-stress integral pond baseboard - Google Patents
Construction method for ultra-large area, ultra-thin non-agglutination pre-stress integral pond baseboard Download PDFInfo
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Abstract
The invention discloses a method for constructing an overlarge-area, ultrathin, unbonded, prestressed and integrated water pool base plate, which comprises the following steps that: the construction of cushion layer concrete: the levelling degree of a cushion layer is controlled within +/-5 mm; a sliding layer is paved on the cushion layer: the thickness is between 0.2 and 0.4 mm; the laying and binding of a base plate layer frame are performed; a prestressed bar of the base plate layer frame adopts the second two-way pretensioning; after the tensioning, the prestressed bar is subjected to anchor sealing, wherein the base plate concrete comprises the following raw materials by weight percentage: 16 to 17 percent of ordinary portland cement, 33 to 34 percent of grit, 39 to 40 percent of carpolite, 7 to 7.7 percent of water, 0.18 to 0.2 percent of compounded anti-cracking additive, 1.7 to 2.65 percent of low-heat and low-alkali gelling material and 0.44 to 0.5 percent of retardation high-efficient water reducer with low alkali content. In the unbonded, prestressed and integrated water pool base plate constructed by the method, the area can reach over 4,000m<2>; the thickness of the base plate is only 150 mm around; the swimming pool base plate has no expansion joint and construction joint, is convenient for anti-leakage control, prolongs the service life of the water pool, reduces the amount of the concrete and greatly reduces the engineering cost.
Description
Technical field
The present invention relates to the job practices of a kind of non-agglutination pre-stress integral pond pond bottom application worker technology, relate in particular to the job practices of a kind of overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard.
Background technology
At present, in recent years, along with the development of every profession and trade, some large-scale pool structures more and more occurred, and were reinforced concrete structure at the bottom of the general pond, pond, thickness of slab 400mm-600mm, and every 20m will establish the shrinkage joint one, employing rubber fastening band sealing.Such base plate, concrete amount is big, and constuction joint is many, is unfavorable for the control of pond antiseep, and rubber fastening band is easily aging, directly influences the application life and the durability in pond.
As everyone knows, for the pond body, particularly large-scale pond body, the base plate infiltration can't with the naked eye be observed, and should not discover, and be difficult to repair, the principal element and the reason that exceed standard of pond body water percolating capacity normally is if the pool wall seepage can observe in water injection test, and can take appropriate measures and repair, so the construction of pond body base plate is the emphasis and the difficult point of pool structure construction.
Summary of the invention
The present invention provides the job practices of a kind of overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard for solving the technical problem that exists in the known technology, this job practices can overcome distortion, warpage and concrete crack, the crackle that overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard are prone to, guarantee to reach the globality effect of designing requirement at the bottom of the pond, thereby guarantee that the impervious effect in whole pond reaches designing requirement.
The present invention for the technical scheme that solves the technical problem that exists in the known technology and take is: the job practices of a kind of overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard may further comprise the steps: (1) construction of cushion layer concrete: the planeness of bed course will be controlled at ± 5mm in; (2) lay sliding layer on the bed course, thickness 0.2mm～0.4mm; (3) backplane level skeleton non-prestressing tendon lower floor reinforcing bar lay, colligation; (4) backplane level skeleton presstressed reinforcing steel lay, every presstressed reinforcing steel all runs through whole base plate; (5) the presstressed reinforcing steel endpoint node is installed; (6) backplane level skeleton non-prestressing tendon top reinforcement lay, colligation; (7) backplane level skeleton presstressed reinforcing steel arch camber, colligation, adjustment; (8) bottom board concrete cast, maintenance: before initial set, finish bottom board concrete and pour into a mould to the Symmetrical Continuous that both sides advance, carry out the concrete surface after the bottom board concrete initial set and smear pressure, maintenance with base plate center line; (9) backplane level skeleton presstressed reinforcing steel stretch-draw for the first time: reach design strength 32%～38% o'clock at concrete strength, carry out the bi-directional symmetrical stretch-draw of presstressed reinforcing steel, the stretch-draw value is 30%～40% of a design load; (10) backplane level skeleton presstressed reinforcing steel stretch-draw for the second time: reach design strength 72%～78% o'clock at concrete strength, carry out the bi-directional symmetrical stretch-draw of presstressed reinforcing steel, reach design load; (11) will finish backplane level skeleton presstressed reinforcing steel sealing off and covering anchorage after the stretch-draw; Wherein bottom board concrete is made up of following raw material by weight percentage: Portland cement, 16%～17%; Sand, 33%～34%; Stone, 39%～40%; Water, 7%～7.7%; Compound cracking resistance Admixture, 0.18%～0.20%; The cementitious material of the low alkali of low-heat, 1.7%～2.65%; The efficient retarding and water reducing agent of low alkali content, 0.44%～0.5%.
Described bottom board concrete is made up of following raw material by weight percentage: Portland cement, 16%; Sand, 34%; Stone, 40%; Water, 7.68%; Compound cracking resistance Admixture, 0.18%; The cementitious material of the low alkali of low-heat, 1.7%; The efficient retarding and water reducing agent of low alkali content, 0.44%.
Described bottom board concrete is made up of following raw material by weight percentage: Portland cement, 17%; Sand, 33%; Stone, 40%; Water, 7.16%; Compound cracking resistance Admixture, 0.19%; The cementitious material of the low alkali of low-heat, 2.2%; The efficient retarding and water reducing agent of low alkali content, 0.45%.
Described bottom board concrete is made up of following raw material by weight percentage: Portland cement, 16.95%; Sand, 33%; Stone, 39%; Water, 7.7%; Compound cracking resistance Admixture, 0.20%; The cementitious material of the low alkali of low-heat, 2.65%; The efficient retarding and water reducing agent of low alkali content, 0.5%.
Described backplane level skeleton presstressed reinforcing steel is a unbonded prestressing tendon.
The layer 2-4 plastic plate of described sliding layer for putting according to layer shop.
Be the rectangular pool base plate at the bottom of the pond, described pond, carry out minor face backplane level skeleton tension of prestressed tendon earlier, grow limit backplane level skeleton tension of prestressed tendon again.
Advantage and good effect that the present invention has are: adopt at the bottom of the non-agglutination pre-stress integral pond pond of the present invention's construction, area can reach 4000m
2More than, base plate thickness has only about 150mm, and no shrinkage joint and constuction joint are convenient to the antiseep control in pond, have improved impervious effect significantly, have prolonged the application life in pond; By reducing base plate thickness, reduced concrete amount, greatly reduced engineering cost.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
Disposed of sewage one day at the bottom of 100,000 tons the pond in Wastewater Treatment Plant mesophytization pond, its length is 87.6m, and width is 55m, pond height degree 6.8m, and the maximum planes area is 87.6m * 55m=4818m at the bottom of the pond
2, thickness has only 150mm, and no shrinkage joint and constuction joint belong to overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard.
See also Fig. 1, the job practices at the bottom of the above-mentioned pond may further comprise the steps:
(1) construction of cushion layer concrete: the planeness of bed course will be controlled at ± 5mm in;
(2) lay sliding layer on the bed course, thickness 0.2mm～0.4mm;
(3) backplane level skeleton non-prestressing tendon lower floor reinforcing bar lay, colligation;
(4) backplane level skeleton presstressed reinforcing steel lay, every presstressed reinforcing steel all runs through whole base plate;
(5) the presstressed reinforcing steel endpoint node is installed;
(6) backplane level skeleton non-prestressing tendon top reinforcement lay, colligation;
(7) backplane level skeleton presstressed reinforcing steel arch camber, colligation, adjustment;
(8) bottom board concrete cast, maintenance: before initial set, finish bottom board concrete and pour into a mould to the Symmetrical Continuous that both sides advance, carry out the concrete surface after the bottom board concrete initial set and smear pressure, maintenance with base plate center line;
(9) backplane level skeleton presstressed reinforcing steel stretch-draw for the first time: reach design strength 32%～38% o'clock at concrete strength, carry out the bi-directional symmetrical stretch-draw of presstressed reinforcing steel, the stretch-draw value is 30%～40% of a design load;
(10) backplane level skeleton presstressed reinforcing steel stretch-draw for the second time: reach design strength 72%～78% o'clock at concrete strength, carry out the bi-directional symmetrical stretch-draw of presstressed reinforcing steel, reach design load;
(11) will finish backplane level skeleton presstressed reinforcing steel sealing off and covering anchorage after the stretch-draw;
Wherein bottom board concrete is made up of following raw material by weight percentage:
Portland cement, 16%～17%
Sand, 33%～34%
Stone, 39%～40%
Water, 7%～7.7%
Compound cracking resistance Admixture, 0.18%～0.20%
The cementitious material of the low alkali of low-heat, 1.7%～2.65%
The efficient retarding and water reducing agent of low alkali content, 0.44%～0.5%.
The objective of the invention is by the method and skill that studies intensively Yu plan, by underplate concrete quality control on construction technology at the bottom of the pond and pre-stress construction Quality Control Technology, reach and overcome distortion, warpage and concrete crack, the crackle that overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard are prone to, guarantee that base plate reaches the globality effect of designing requirement, thereby guarantee that the impervious effect in whole pond reaches designing requirement.
One, concrete construction quality control technology
To the examination in the bottom board concrete work progress join, build, vibrate, construction key point such as maintenance carries out strict quality control on construction.
1) trying to join is the first road key procedure of guaranteeing the concrete construction quality, for crack, the crackle that reduces concrete to greatest extent, adopts the good material of anti crack performance emphatically when selecting the main raw material(s) of concrete, to satisfy instructions for use.
1. consider that from the angle of quality stability cement is selected P.042.5 Portland cement for use.
2. the efficient compound cracking resistance Admixture of admixture in the concrete improves impervious and the anticracking ability, reduces the microcrack in the concrete, reduces concrete shrinkage crack simultaneously, prolongs the solid time of concrete initial set and final set.
3. select for use low-heat to hang down alkali binding material, reduce concrete center maximum temperature and internal-external temperature difference, in case crackle produces.
4. select the efficient retarding and water reducing agent of low alkali content for use, use high efficiency water reducing agent, reduce cement consumption guaranteeing to reduce water/binder ratio under the same working strength condition, postpone the generation of the heat of hydration, can postpone the time that the peak occurs, reduce maximum temperature, reduce internal-external temperature difference, reduce distress in concrete.
5. observe the principle of middle low-intensity high-efficient high performance concrete mix in the concrete proportioning:
A, control water/binder ratio are between 0.43～0.44;
B, the slump are between 180mm～185mm.
Several embodiment that are fit to the bottom board concrete of above-mentioned instructions for use below are provided:
Embodiment 1: for the concrete of the C25 strength grade that is fit to above-mentioned instructions for use, Portland cement with 16%, 34% sand, 40% stone, 7.68% water, 0.18% compound cracking resistance Admixture (name of product: HA-GG, factory: Jinzhou City's Concrete admixtures factory), cementitious material (the name of product: flyash of the low alkali of 1.7% low-heat, factory: Jinzhou City's fly ash development comprehensive utilization company), the efficient retarding and water reducing agent of 0.44% low alkali content (name of product: JL-118, factory: mix stirring Jinzhou City's Concrete admixtures factory).Above-mentioned concrete water/binder ratio is 0.43; The slump is 180mm.
Embodiment 2: for the concrete of the C30 strength grade that is fit to above-mentioned instructions for use, the efficient retarding and water reducing agent of the cementitious material of the Portland cement with 17%, 33% sand, 40% stone, 7.16% water, 0.19% compound cracking resistance Admixture, 2.2% the low alkali of low-heat, 0.45% low alkali content mixes stirring.Above-mentioned concrete water/binder ratio is 0.435; The slump is 180mm.
Embodiment 3: for the concrete of the C35 strength grade that is fit to above-mentioned instructions for use, the efficient retarding and water reducing agent of the cementitious material of the Portland cement with 16.95%, 33% sand, 39% stone, 7.7% water, 0.20% compound cracking resistance Admixture, 2.65% the low alkali of low-heat, 0.5% low alkali content mixes stirring.Above-mentioned concrete water/binder ratio is 0.44; The slump is 185mm.
2) for guaranteeing overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard globality effect, the concrete that bottom board concrete must formerly be poured into a mould was finished the cast of all bottom board concretes before the initial setting time, and necessary continuous pouring, must not stay constuction joint.The casting sequence of concrete should be considered " symmetry ", considers usually to advance to both sides from the centre of pond body.Main purpose is for the stretch-draw of prestressing force bi-directional symmetrical creates conditions, and it is consistent to guarantee that body symmetry limit, pond concrete strength increases, and the concrete that whole base plate is successively poured into a mould, consistent or close on the intensity during stretch-draw.In this enforcement, the cast of concrete drops into four automotive pump, and two of every sides advance cast to both sides in the middle of biochemistry pool, water the about 180m of fluence
3/ hour, the nearly 1800m of whole bottom board concrete
3, casting complete in 10 hours is guaranteed continuous pouring, does not stay constuction joint.
3) to carry out the concrete surface after the bottom board concrete initial set and smear pressure, carry out water seasoning, be no less than seven days, and plastic covering film or straw screen or mat, irregular contraction fissure appears to avoid the concrete surface.
Two, pre-stress construction Quality Control Technology
1) common backplane bed course planeness requires to be controlled at ± 10mm 4000m
2The planeness of above overlarge area, ultra-thin whole non-agglutination pre-stress integral pond baseboard bed course will be controlled at ± and below the 5mm, purpose is that the lay for the slip plastic plate creates conditions, and guarantees that sliding layer can more effectively play a role.
2) adopt increase sliding layer construction technology between bed course and base plate, 2～4 layers of slip plastic plate promptly are set between bed course and base plate, the thickness of whole sliding layer is 0.2mm～0.4mm, purpose is the frictional resistance that reduces in the prestressed stretch-draw process, reduce the stress loss in the prestressed stretch-draw, prestressing force more effectively is applied on the concrete base plate, has increased the density and the globality of concrete.Compare as sliding layer with the brushing asphalt cement of routine, the slip plastic plate can reduce the frictional resistance in the prestressed stretch-draw biglyyer, and be easier to construction, convenient to operation, not limited by weather, all right reduction of erection time, in the present embodiment, sliding layer adopts the three-layer plastic plate, and sliding layer thickness is 0.3mm.
3) stretch-draw of general prestressed member, to when reaching design strength 100%, concrete strength carry out, and mostly be the fixing unidirectional stretch-draw of an end, the present invention adopts secondary two dimension prestressing muscle stretching construction technology aspect prestressed stretch-draw, guarantee the globality of overlarge area, ultra-thin prestressing force pond baseboard, avoided because base areas is big, thin thickness and unstability produces distortion, warpage.Whole prestressed stretch-draw carries out at twice, is to carry out when concrete strength reaches design strength 32%-38% for the first time, is to carry out when concrete strength reaches design strength 72%-78% for the second time.By the same condition nature test block of keeping somewhere in the concrete casting process, determine the stretch-draw time.In the present embodiment, stretch-draw for the first time is to reach 35% o'clock of design strength at concrete strength to carry out, and the control stretching force of every unbonded prestressing tendon of stretch-draw for the first time is 89KN, and the stretch-draw value is controlled at 35% of design load; Stretch-draw for the second time is to reach 75% o'clock of design strength at concrete strength to carry out, and the stretching force of every presstressed reinforcing steel reaches design load 193.9KN.The method of bi-directional symmetrical stretch-draw is all taked in twice stretch-draw, and presstressed reinforcing steel is a unbonded prestressing tendon in the present embodiment, so that control the prestressed stretch-draw of base plate better.
The purpose of stretch-draw for the first time is and will becomes flexible by sliding layer between base plate and the bed course, with the stretch-draw value be controlled at design load 30% to 40% between, be more abundant more effective the creating conditions of the stretch-draw second time.
The method of bi-directional symmetrical stretch-draw is all taked in twice stretch-draw, and every presstressed reinforcing steel all runs through whole base plate, middle no stretch-draw point and anchor point.All stretch-draw are the two ends simultaneous tension, and the jack at two ends give to be pressed synchronously, reach the stretching force value of regulation, anchoring at one end earlier, and the other end is supplied anchoring again after the stretch-draw value.If the rectangular pool base plate should carry out minor face stretch-draw earlier, grow limit stretch-draw again, stretch-draw advances to both sides from the centre, carries out at interval, and then returns middle from both sides.
4) tension operation main points
Wear muscle: the front end of presstressed reinforcing steel from jack penetrated, till the top pressing device of jack withstands ground tackle.
Stretch-draw: after the pump start fuel feeding is normal, begin pressurization, when pressure reaches 2.5MPa, stop pressurization.Adjust the position of jack, continue pressurization, until the stretching force that reaches designing requirement.When the jack stroke did not satisfy required stretch value, anchoring temporarily was made in Halfway Stopping stretch-draw, refunded the jack stroke, carried out the stretch-draw second time again.
Stretching force is undertaken by the numerical value of demarcating during stretch-draw, checks with stretch value, i.e. stretch-draw quality adopts the two control methods of ess-strain.The actual stretch value error of stretch-draw should not surpass theoretic elongation ± 6%.
The jack installation site should with unbonded tendon on same axis, and keep vertical with bearing plate, otherwise, should adopt angulator to carry out stretch-draw.
Although in conjunction with the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (7)
1. the job practices of an overlarge area, ultra-thin non-agglutination pre-stress integral pond baseboard is characterized in that, may further comprise the steps:
(1) construction of cushion layer concrete: the planeness of bed course will be controlled at ± 5mm in;
(2) lay sliding layer on the bed course, thickness 0.2mm～0.4mm;
(3) backplane level skeleton non-prestressing tendon lower floor reinforcing bar lay, colligation;
(4) backplane level skeleton presstressed reinforcing steel lay, every presstressed reinforcing steel all runs through whole base plate;
(5) the presstressed reinforcing steel endpoint node is installed;
(6) backplane level skeleton non-prestressing tendon top reinforcement lay, colligation;
(7) backplane level skeleton presstressed reinforcing steel arch camber, colligation, adjustment;
(8) bottom board concrete cast, maintenance: before initial set, finish bottom board concrete and pour into a mould to the Symmetrical Continuous that both sides advance, carry out the concrete surface after the bottom board concrete initial set and smear pressure, maintenance with base plate center line;
(9) backplane level skeleton presstressed reinforcing steel stretch-draw for the first time: reach design strength 32%～38% o'clock at concrete strength, carry out the bi-directional symmetrical stretch-draw of presstressed reinforcing steel, the stretch-draw value is 30%～40% of a design load;
(10) backplane level skeleton presstressed reinforcing steel stretch-draw for the second time: reach design strength 72%～78% o'clock at concrete strength, carry out the bi-directional symmetrical stretch-draw of presstressed reinforcing steel, reach design load;
(11) will finish backplane level skeleton presstressed reinforcing steel sealing off and covering anchorage after the stretch-draw;
Wherein bottom board concrete is made up of following raw material by weight percentage:
Portland cement, 16%～17%
Sand, 33%～34%
Stone, 39%～40%
Water, 7%～7.7%
Compound cracking resistance Admixture, 0.18%～0.20%
Cementitious material, 1.7%～2.65%
Efficient retarding and water reducing agent, 0.44%～0.5%.
2. the job practices of overlarge area according to claim 1, ultra-thin non-agglutination pre-stress integral pond baseboard is characterized in that, described bottom board concrete is made up of following raw material by weight percentage:
Portland cement, 16%
Sand, 34%
Stone, 40%
Water, 7.68%
Compound cracking resistance Admixture, 0.18%
Cementitious material, 1.7%
Efficient retarding and water reducing agent, 0.44%.
3. the job practices of overlarge area according to claim 1, ultra-thin non-agglutination pre-stress integral pond baseboard is characterized in that, described bottom board concrete is made up of following raw material by weight percentage:
Portland cement, 17%
Sand, 33%
Stone, 40%
Water, 7.16%
Compound cracking resistance Admixture, 0.19%
Cementitious material, 2.2%
Efficient retarding and water reducing agent, 0.45%.
4. the job practices of overlarge area according to claim 1, ultra-thin non-agglutination pre-stress integral pond baseboard is characterized in that, described bottom board concrete is made up of following raw material by weight percentage:
Portland cement, 16.95%
Sand, 33%
Stone, 39%
Water, 7.7%
Compound cracking resistance Admixture, 0.2%
Cementitious material, 2.65%
Efficient retarding and water reducing agent, 0.5%.
5. the job practices of overlarge area according to claim 1, ultra-thin non-agglutination pre-stress integral pond baseboard is characterized in that, described backplane level skeleton presstressed reinforcing steel is a unbonded prestressing tendon.
6. the job practices of overlarge area according to claim 1, ultra-thin non-agglutination pre-stress integral pond baseboard is characterized in that, the layer 2-4 plastic plate of described sliding layer for putting according to layer shop.
7. the job practices of overlarge area according to claim 1, ultra-thin non-agglutination pre-stress integral pond baseboard, it is characterized in that, be the rectangular pool base plate at the bottom of the pond, described pond, carry out minor face backplane level skeleton tension of prestressed tendon earlier, grow limit backplane level skeleton tension of prestressed tendon again.
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| CN101936040B (en) * | 2010-08-30 | 2013-07-24 | 中冶天工建设有限公司 | Deformation release method for large-scale overlong multilayer concrete pool construction |
| CN101979802A (en) * | 2010-11-05 | 2011-02-23 | 中国建筑第八工程局有限公司 | Extra-large area concrete construction method |
| CN102677899A (en) * | 2012-03-09 | 2012-09-19 | 中石油东北炼化工程有限公司吉林设计院 | Seamless structural method of overlong reinforced concrete pond |
| CN104747204A (en) * | 2015-01-20 | 2015-07-01 | 广东省建筑工程集团有限公司 | Construction technology for foundation slab sliding layer of super-long tunnel |
| CN105298133B (en) * | 2015-10-13 | 2018-05-04 | 悉地（苏州）勘察设计顾问有限公司 | Lift the design and construction method of mass concrete invert crack resistance |
| CN105781199A (en) * | 2016-04-06 | 2016-07-20 | 北京市政建设集团有限责任公司 | Construction method for bottom plate sliding layers of large ponds of water works |
| CN112663774B (en) * | 2021-01-18 | 2022-06-28 | 中铁八局集团有限公司 | Construction method of unbonded prestressed large-diameter reinforced concrete thin-wall circular water tank |
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