CN109736315A - A kind of gradual change type gradient volume abnormal concrete operational method - Google Patents
A kind of gradual change type gradient volume abnormal concrete operational method Download PDFInfo
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- CN109736315A CN109736315A CN201910028988.5A CN201910028988A CN109736315A CN 109736315 A CN109736315 A CN 109736315A CN 201910028988 A CN201910028988 A CN 201910028988A CN 109736315 A CN109736315 A CN 109736315A
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Abstract
The invention discloses a kind of gradual change type gradient volume abnormal concrete operational methods.Abnormal concrete area carry out gradual change add slurry volume grouting, formed multi-gradient formula add slurry volume abnormal concrete, by far from roll area's metamorphosis floor high additive add slurry gradually decrease slurry adding amount until entirely roll region without add slurry；It is layered the number of plies according to the abnormal concrete having had determined that, field regions division is carried out to abnormal concrete, is starched from the area Fu Jiang to the area Huo Shaojiang, the area Shao Jiang to richness and distinguishes floor cementing operations, layering meets the requirement such as ultimate tensile strength, resistance to compression bullet mould, split tensile strength.The present invention, which can satisfy, rolls-site operation the demand of abnormal concrete, enhances the bonding transition and structure sheaf globality between different materials faying face, has more adapted to design performance needs；Gradual change type laminated gradient volume adds slurry, can effectively save abnormal area add slurry total amount, save cost；It is layered plus is starched using mechanical intelligentization, effectively controlled each layer and add abnormal pulp layer quality uniformity.
Description
Technical field
The invention belongs to concrete dam pouring technical field, it is related to abnormal concrete slurry injection technique in RCC dam,
Specifically a kind of gradual change type gradient volume metamorphosis concrete slurry adding operational method.
Background technique
RCC dam relies on the advantages that its easy construction safety, short time limit, low cost to be rapidly developed.Metamorphosis is mixed
Solidifying soil plays particularly significant effect to RCC dam as an important measures of dam body seepage.To guarantee that dam body seepage is wanted
The quick needs of site construction are sought and meet, by the grinding coagulation Tu Pu for locally needing to enhance antiseepage position in engineering construction
Material region scene adds slurry or the mechanism abnormal concrete of directlying adopt to fill to form abnormal concrete, to improve concrete corresponding site
Impervious endurance quality.In Contraction in Site, to meet works fine and vibration compacting, manually or mechanically slurry adding amount
It is often more on the high side than design slurry adding amount.But adding slurry hypervolia, to will lead to abnormal concrete water-cement ratio bigger than normal, occur plus slurry area with
The curing shrinkage deformation in area is rolled, faying face globality is weakened, or even causes interface and shrinks to form crack.It is above-mentioned existing
As happening occasionally during Construction of Rolled Concrete Dam.When there is obvious crack, unit in charge of construction then needs to handle again,
Such as carry out grouting reinforcement, it is clear that will affect the construction period, increase additional cost of constructing.Even if having no that obvious layering disengages, also can
Influence rolls the long-acting durability of the binder course section entirety on abnormal concrete dam.
There are two types of modes for abnormal concrete construction in existing RCC dam: mechanism abnormal concrete and scene plus slurry become
State concrete.Mechanism abnormal concrete refers to the similar normal concrete that preparation is mixed using mixing station, and transport is poured into abnormal mixed
Solidifying soil region.Mixing station production normal concrete is significantly greater compared to grinding coagulation soil w/c, and glue material (cement) dosage is higher；And
Scene plus sizing process are often satisfaction plus slurry full weight and uniformly vibrating property can also add cement slurry.Such way, will lead to
Volume shrinkage mass is apparently higher than and rolls area after abnormal area pours hardening, easily causes the binder course part with grinding coagulation soil cross-connecting area
Each self-reversal free shrink increases interface tensile stress, and even binding site disengages to form Interface Crack when serious.
Above-mentioned technological effect analysis shows, roll dam metamorphosis regional structure form, cause plus slurry mixture mixed with area is rolled
It closes object and forms different cement contents and significant water-cement ratio difference, be to lead to being difficult to for compromised quality in existing abnormal concrete construction
It avoids the problem that.Its key point is that the curing shrinkage modified difference of two kinds of different kind of material is anisotropic big, and thick with abnormal region
Degree increases or slurries volume difference increases, and cracking risk has increasing trend.How a kind of effective ways of such issues that solution are
Reduce shrinkage difference of two kinds of mixture materials on construction layering dimensions.
Summary of the invention
The present invention is for abnormal concrete area generally existing during Construction of Rolled Concrete Dam and grinding coagulation soil mistake
It crosses area's contact surface and deforms difficult Research on Interactive Problem, propose that a kind of gradual change volume gradient type abnormal concrete operation adds slurry processes.The present invention is logical
It crosses gradient and adds slurry, realize that gradually transition reduces addition slurries volume ecto-entad, increases abnormal concrete slip casting area total tune
Property, reduce and grinding coagulation soil contact zone contraction distortion gap, realization be abnormal -- it rolls in conjunction with enhancing or even prevents in conjunction with level
There is the purpose in crack.
In order to achieve the above object, the present invention takes following technical scheme:
Gradual change type gradient volume abnormal concrete operational method, it is characterised in that including following methods:
Gradual change is carried out in abnormal concrete area and adds slurry volume grouting, is formed multi-gradient formula and is added slurry volume abnormal concrete,
By far from roll area's metamorphosis floor high additive add slurry gradually decrease slurry adding amount until entirely roll region without add slurry；
It is layered the number of plies according to the abnormal concrete having had determined that, field regions division is carried out to abnormal concrete, is starched from richness
It is starched to the area Huo Shaojiang, the area Shao Jiang to richness and distinguishes floor cementing operations in area.
Laminated gradient formula of the present invention adds slurry volume abnormal concrete to be at least divided into two layers, including far from the change for rolling area
State concrete high additive floor, the abnormal concrete low-dosage floor adjacent with area is rolled are to rolling region without adding pulp layer entirely.
Each layering abnormal concrete meets the following conditions:
(1) ultimate tensile strength: ξo≤0.8ξ1；In formula: ξoIt is layered optimal limit elongation strain, ξ1Single metamorphosis coagulation
Soil layer limit tensile strain；
(2) resistance to compression bullet mould: E0>E1；In formula: E0It is layered best resistance to compression bullet mould, E1Single abnormal concrete layer resistance to compression bullet
Mould, units MPa；
(3) split tensile strength: fto> 1.2fts；In formula: ftoIt is layered best split tensile strength, ftsSingle abnormal concrete splitting
Intensity, units MPa；
(4) seepage-resistant grade is required to meet the adjacent abnormal concrete seepage-resistant grade of every slice gradient and improves than single abnormal layer
Level-one, whole seepage-resistant grade are greater than design seepage-resistant grade.
The present invention adds in slurry construction, adds slurry volume in the design gradual change of abnormal concrete area, forms laminated gradient formula and slurry is added to mix
Measure abnormal concrete, by far from roll area's metamorphosis floor high additive add slurry gradually decrease slurry adding amount until entirely roll region without add slurry,
It is poor that the mutual self-constriction of gradual change can be effectively improved, enhance compatibility of deformation, and then improve metamorphosis-and roll overall performance.
Helpfulness of the present invention: the present invention uses gradual change type gradient volume abnormal concrete operational method, the advantage is that:
(1) can satisfy and roll-site operation the demand of abnormal concrete, enhance bonding transition between different materials faying face and
Structure sheaf globality has more adapted to design performance needs；(2) gradual change type laminated gradient volume adds slurry, effectively save can become
State area adds slurry total amount, saves cost；(3) it is layered plus starches using mechanical intelligentization, effectively control each layer and add abnormal pulp layer quality
Uniformity.
Detailed description of the invention
Fig. 1 is that common abnormal concrete scene adds sizing process model schematic, wherein 1. --- grinding coagulation soil operation area,
2. -- conventional abnormal concrete operation area；
Fig. 2 is that gradual change type gradient volume adds sizing process model schematic, wherein 3. -- conventional grinding coagulation soil operation area,
4. -- the area abnormal concrete Pin Jiang, 5. -- the area abnormal concrete Fu Jiang；
Fig. 3 is that different addition quantity adds the lower abnormal concrete of slurry to shrink comparison diagram in case study on implementation；Wherein, abscissa is from left to right
The area abnormal concrete Fu Jiang, the area Pin Jiang, grinding coagulation Tu Qu are respectively indicated, ordinate is shrinking percentage.
Fig. 4 is abnormal under different grouting process in case study on implementation -- roll faying face 28d split tensile strength comparison diagram: abscissa
A indicates that scene plus sizing process, b indicate that gradual change type gradient volume adds sizing process, and ordinate indicates split tensile strength, units MPa.
Specific embodiment
Present invention invention is further illustrated With reference to embodiment, specific embodiment is invented the present invention
The further explanation of principle does not limit the invention in any way invention, and technology same or like with the utility model does not have
Range beyond present invention invention protection.
In conjunction with attached drawing.
Gradual change type gradient volume abnormal concrete operational method.
First part: abnormal concrete layering
Under the conditions of meeting following design mechanical performance index, by designing different graded beddings, different slurry adding amounts, compare general
Logical plus pulp layer, the rolling of slurry adding amount-abnormal trial zone.Best gradual change type gradient volume adds the determination of slurry processes technological parameter as follows:
(1) ultimate tensile strength: ξo≤0.8ξ1；In formula: ξoIt is layered optimal limit elongation strain；ξ1Single metamorphosis coagulation
Soil layer limit tensile strain；
(2) resistance to compression bullet mould: E0>E1；In formula: E0It is layered best resistance to compression bullet mould, E1Single abnormal concrete layer resistance to compression bullet
Mould, units MPa；
(3) split tensile strength: fto> 1.2fts；In formula: ftoIt is layered best split tensile strength；ftsSingle abnormal concrete splitting
Intensity, units MPa；
(4) seepage-resistant grade should meet the adjacent abnormal concrete seepage-resistant grade of every slice gradient than single abnormal layer raising one
Grade, and whole seepage-resistant grade is greater than design seepage-resistant grade.
Comprehensively consider above-mentioned performance indicator condition requirement, obtains the slice gradient layer of reasonable in test at the scene in advance
Several, every thickness degree, each layer gradient slurry adding amount index；Site operation convenience, controllability and the gradual change demand for adding pulp layer are taken into account,
Determine the technological parameter index of last reasonably optimizing.
Second part, construction site storehouse surface implement gradual change and add slurry operation.
It is layered the number of plies according to the abnormal concrete having had determined that, field regions division is carried out to abnormal concrete.It is recommended that adopting
It takes equal part layering width method to reduce working procedure, guarantees job scheduling.Consider different layerings plus slurry operation, slip casting lift height
Control and the requirement of single layer slurry adding amount norm controlling, selection rationally add sizing process and equipment.Effect is extended according to slurry infiltration, really
Fixed layering plus the slurry sequence of operation (can starch stratified operation from richness slurry to few slurry or few slurry to richness), implement gradual change type gradient and add slurry operation
Method.
Certain left bank 10# metamorphosis chosen below roll area the 4th construction storehouse (1#~5# monolith, elevation 1882.00m~
Elevation 1888.00m) for be illustrated.Wherein, dam abnormal concrete slip casting width 3m designs coagulation local prescription grouting amount
85L/m3(L- liter).
(1) the binder course abnormal concrete mechanical performance index determining according to design, determines final abnormal concrete gradient
Slurry is added to be divided into the area Fu Jiang, two layers of the area Pin Jiang plus slurry, every layer bandwidth is 1.5m, and folk prescription grouting amount is respectively the area Fu Jiang 85L/m3,
The area Pin Jiang 50L/m3.Abnormal concrete 28d, 90d limit tensile strain is respectively smaller than 0.7 × 10 under the operational method-4With 0.85
×10-4；Abnormal area's sample 28d, 90d resistance to compression bullet mould is respectively greater than 28.0 × 104MPa and 35.0 × 104MPa；28d, 90d are split
It splits tensile strength and is respectively greater than 1.5MPa and 2.0MPa；Richness is starched, the area Pin Jiang seepage-resistant grade is respectively greater than W9 and W8, and synthesis is impervious etc.
Grade is greater than W8.
(2) concrete construction situation and abnormal concrete slip casting band division principle are combined, suitable abnormal coagulation is used
Soil plus slurry equipment, i.e., intelligent stirring-type machinery slip casting machine add slurry.The type slip casting machine slip casting is layered thick position control slurry adding amount precision
Height, flow rate of grouting uniformity real-time control effect is good, can efficiently realize that abnormal concrete layering changes grouting parameter operation.It is right
Than devising storehouse surface abnormal concrete simple layer Jia Jianghe area's richness slurry, poor slurry layer-stepping adds the control embodiment of slurry, such as Fig. 2 institute
Show.
(3) using intelligent stirring-type machinery slip casting machine, the accurate implementation met under building site normal process requires is abnormal mixed
The area Ning Tu richness slurry, poor slurry layer-stepping add slurry operation.
(4) intuitive morphology analysis.Abnormal concrete observation analysis after the completion of vibrating is found, single metamorphosis layer adds sizing process
Since slurry adding amount is slightly more and not uniform enough, there is more bleeding in surface layer；Due to adding pulp layer difference in shrinkage big, metamorphosis-grinding coagulation
Soil forms obvious interface.In contrast, the layering of rich or poor slurry plus slurry working system due to it is more, less, without starching three layers of gradual change type volume
Technique realizes good transition between different concrete bed of material faying faces, osmosis of vibrating in addition, different interlayer metamorphosis coagulations
Native performance difference reduces, and improves metamorphosis-and rolls section adhesion strength.
(4) live storehouse surface has carried out different plus sizing process abnormal concrete self-constriction detection, and compares common single layer and add
Slurry carries out the test of 28d tensile splitting strength with regard to metamorphosis-grinding coagulation soil bond regions coring after hardening.
Roll-abnormal concrete shrinking percentage is calculated using the following equation:
η=(RBefore-RAfterwards)/RBefore× 100%
In formula: RBefore- shrink preceding piece lengths, mm；RAfterwardsPiece lengths after-contraction, mm.
It was found that scene adds under sizing process, for abnormal concrete since cement slurry content is more, shrinking percentage is relatively large；In contrast,
Gradual change type gradient volume adds the slurry area operation Zhong Pinjiang concrete contraction percentage to significantly reduce.That is, gradient adds slurry processes metamorphosis-stone roller
Pressure two sides concrete shrinkage speed difference compares scene plus slurry processes are significantly improved, this direct will weaken metamorphosis-and roll faying face institute
Tensile stress is born, combination cracking risk is reduced.
Split tensile strength carries out as follows:
In formula: fts-- concrete splitting tensile strength, MPa；P-- failing load, N；A-- test specimen cleaves area, mm2；
The test of faying face split tensile strength shows metamorphosis-grinding coagulation soil split tensile strength under top and bottom process (gradient) plus slurry processes
Slurry processes split tensile strength is added to increase compared to live simple layer, adhesion strength is also same regular, as shown in Figure 3, Figure 4.
Above-mentioned contraction splits and inspection result is drawn to show that gradual change type gradient volume adds slurry processes interface binding intensity high, suffered contraction
Tensile stress is small, this increases that and subtracts, and provides guarantee for the reliable connection that metamorphosis-rolls in RCC dam.
In addition, gradual change type gradient volume, which adds slurry processes Zhong Pinjiang area's slurry adding amount to be less than archimetaboly Concrete Design, adds slurry value, by
This is also reduced plus pulp material expense.
Above in conjunction with attached drawing, embodiments of the present invention are described in detail.But the present invention is not limited to described
Embodiment.For those of ordinary skill in the art, in the range of the principle of the present invention and technical idea, to these
Embodiment carries out a variety of variations, modification, replacement and deformation and still falls in protection scope of the present invention.
Claims (3)
1. a kind of gradual change type gradient volume abnormal concrete operational method, it is characterised in that including following methods:
Gradual change is carried out in abnormal concrete area and adds slurry volume grouting, is formed multi-gradient formula and is added slurry volume abnormal concrete, by remote
From roll area's metamorphosis floor high additive add slurry gradually decrease slurry adding amount until entirely roll region without add slurry；
It is layered the number of plies according to abnormal concrete, field regions division is carried out to abnormal concrete, it is from the area Fu Jiang to the area Shao Jiang or few
It starches area and starches differentiation floor cementing operations to richness.
2. gradual change type gradient volume abnormal concrete operational method according to claim 1, it is characterised in that: the layering
Gradient type adds slurry volume abnormal concrete to be at least divided into two layers, including far from the abnormal concrete high additive floor and stone roller for rolling area
The adjacent abnormal concrete low-dosage layer of pressure area is to rolling region without adding pulp layer entirely.
3. gradual change type gradient volume abnormal concrete operational method according to claim 2, it is characterised in that: described each point
Layer abnormal concrete meets the following conditions:
(1) ultimate tensile strength: ξ0≤0.8ξ1；In formula: ξ0It is layered optimal limit elongation strain；ξ1Single abnormal concrete layer
Limit tensile strain；
(2) resistance to compression bullet mould: E0>E1；In formula: E0It is layered best resistance to compression bullet mould；E1Single abnormal concrete layer resistance to compression bullet mould, unit
MPa；
(3) split tensile strength: fto> 1.2fts；In formula: ftoIt is layered best split tensile strength；ftsSingle abnormal concrete splitting is strong
Degree, units MPa；
(4) seepage-resistant grade is required to meet the adjacent abnormal concrete seepage-resistant grade of every slice gradient and improves one than single abnormal layer
Grade, whole seepage-resistant grade are greater than design seepage-resistant grade.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU579558B2 (en) * | 1985-09-04 | 1988-11-24 | Ronald L. Hurt | Rcc dam construction and method |
| US6682260B2 (en) * | 2002-06-03 | 2004-01-27 | Ronald L. Peltz | Roller compacted concrete paving sealing method |
| CN202945579U (en) * | 2012-12-04 | 2013-05-22 | 中国水电顾问集团贵阳勘测设计研究院 | Full-section three-graded concrete dam structure |
| JP5430435B2 (en) * | 2010-02-16 | 2014-02-26 | 鹿島建設株式会社 | Construction method of concrete embankment |
| CN204608788U (en) * | 2015-05-04 | 2015-09-02 | 中国水利水电第七工程局有限公司 | A kind of modified metamorphosis concrete slurry adding work rod |
| CN106192907A (en) * | 2016-07-11 | 2016-12-07 | 中国水利水电第十工程局有限公司 | Set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf |
| CN108708555A (en) * | 2018-07-03 | 2018-10-26 | 中国水利水电第四工程局有限公司 | A kind of concrete grouting quantitatively uses tool and abnormal concrete construction method |
-
2019
- 2019-01-12 CN CN201910028988.5A patent/CN109736315B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU579558B2 (en) * | 1985-09-04 | 1988-11-24 | Ronald L. Hurt | Rcc dam construction and method |
| US6682260B2 (en) * | 2002-06-03 | 2004-01-27 | Ronald L. Peltz | Roller compacted concrete paving sealing method |
| JP5430435B2 (en) * | 2010-02-16 | 2014-02-26 | 鹿島建設株式会社 | Construction method of concrete embankment |
| CN202945579U (en) * | 2012-12-04 | 2013-05-22 | 中国水电顾问集团贵阳勘测设计研究院 | Full-section three-graded concrete dam structure |
| CN204608788U (en) * | 2015-05-04 | 2015-09-02 | 中国水利水电第七工程局有限公司 | A kind of modified metamorphosis concrete slurry adding work rod |
| CN106192907A (en) * | 2016-07-11 | 2016-12-07 | 中国水利水电第十工程局有限公司 | Set up the construction method of 150m～the 300m level high concrete panel rock-fill dams of cement sand and gravel structure sheaf |
| CN108708555A (en) * | 2018-07-03 | 2018-10-26 | 中国水利水电第四工程局有限公司 | A kind of concrete grouting quantitatively uses tool and abnormal concrete construction method |
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