CN103452330A - Method for strengthening circular structure bottom - Google Patents
Method for strengthening circular structure bottom Download PDFInfo
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- CN103452330A CN103452330A CN2013103668369A CN201310366836A CN103452330A CN 103452330 A CN103452330 A CN 103452330A CN 2013103668369 A CN2013103668369 A CN 2013103668369A CN 201310366836 A CN201310366836 A CN 201310366836A CN 103452330 A CN103452330 A CN 103452330A
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Abstract
The invention discloses a method for strengthening a circular structure bottom. The method comprises the following steps of (1) selecting a cement grouting material to act as a first material, adulterating a grouting material added with a flexible admixture as a second material, and testing the cure shrinkage rate of the first material and the second material; (2) calculating the sector central angle rate of the first material and the second material according to the formula Angle1/Angle2=Shrinkage2/Shrinkage1, and calculating the sector central angle of each first material and each second material occupying at a cylinder bottom according to the formula 360=N*(Angle1+Angle2); (3) pouring the first material and the second material at interval in a circular region of a destroyed circular structure bottom. By using the method, the cracking resistance of the strengthened structure part can be improved.
Description
Technical field
The present invention relates to a kind of reinforcement means of circular configuration bottom, especially relate to the reinforcement means that adopts flexible grouting agent and rigidity grouting agent interval while reinforcing the circular configuration bottom.
Background technology
High-performance without vibration grouting material (concrete) is at concrete structure reinforcing and equipment, a large amount of constructional materialss that use to be installed now.There is self drainage good, fast hard, early strong, high-strength; Nontoxic, harmless, not aging, pollution-free to water quality and surrounding environment, from characteristics such as close property are good, antirust; At the construction party mask, reliable in quality is arranged, reduce costs, reduction of erection time and the advantage such as easy to use.But the major defect of this class constructional materials be because of early strength require fast, in match ratio except the cement occupancy volume is higher, be mixed with multiple Admixture and additive in it, the early water heat-transmission is strong, variations in temperature in maintenance processes is larger, volume can change at the maintenance initial stage, thereby easily cracked, and had influence on its impermeability, durability.
Improving a kind of method of grouting material is the flexible admixture of admixture, can increase like this splitting resistance of material.But this flexible admixture price, the also relative complex of constructing.
The patent No. is CN201020511912.2, the disclosed Slabstone floor system reinforcing structure of the Chinese patent that denomination of invention is " Slabstone floor system reinforcing structure ", the composite consolidation layer that it forms for the modified cement mortar coating that is not less than 25MPa by reinforced mesh, cement paste coating and intensity, reinforced mesh is fitted and is installed on slate building roof bottom surface to be reinforced by connector, the cement paste coating is coated on the slate building roof bottom surface that laminating is equipped with above-mentioned reinforced mesh, and the modified cement mortar coating is coated on the cement paste coating.This structure adopts independent modified cement mortar coating, is a kind of had and common technique.Its reinforce to as if the slabstone building, its geometry is not illustrated.Problem of Cracking for common existence does not propose innovative technology path, there is no the formula of mathematical of proposition based on material engineering as the key technology in technology contents yet.
Summary of the invention
The object of the invention is to overcome the defect of prior art, a kind of reinforcement means that can improve a kind of circular configuration bottom of ruggedized construction anti-cracking performance partly is provided.
The reinforcement means of a kind of circular configuration of the present invention bottom, it comprises the following steps:
(1) choose strength cement-based grouting material as the grouting material of the flexible admixture of the first material, admixture as the second material, then test the cure shrinkage of the first material and the second material;
(2) calculate the fan-shaped central angle angle ratio of the first material and the second material according to formula Angle1/Angle2=Shrinkage2/Shrinkage1, in formula, Angle1 is the fan-shaped central angle angle of every a the first material cylindrical base of occupying, Angle2 is the fan-shaped central angle angle of every a the second material cylindrical base of occupying, and Shrinkage1 and Shrinkage2 are respectively the cure shrinkages of the first material and the second material; Then calculate the fan-shaped central angle angle of the cylindrical base that every a the first material and every a the second material occupy according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data of determining in the cylindrical base border circular areas, the even number that N is >=2;
(3) the fan-shaped central angle angle of the cylindrical base that every a the first material obtained according to step (2) and the second material occupy and the first material and the second material cast total block data, pour into a mould the first material and the second material at damaged border circular areas interval, circular configuration bottom.
The invention has the beneficial effects as follows: utilize two kinds of grouting materials, a kind of is strength cement-based grouting material, the second is the flexible admixture of admixture in traditional grouting material, two kinds of intervals pour into damaged circular configuration bottom border circular areas, make the two form one, performance rigid material intensity is high and the flexible material volumetric change does not ftracture and the good characteristic of ductility, can improve like this anti-cracking performance of ruggedized construction part, can, on price and aspect construction, obtain an equalization point.
The accompanying drawing explanation
Fig. 1 is that damaged circular configuration bottom border circular areas is repaired the first material and the second distribution of material schematic diagram with grouting agent;
Fig. 2 is the internal stress computation model of bi-material.
Left side white portion represents the first material, and the right meshing represents the second material, and model two ends condition is solid.
The specific embodiment
The reinforcement means of a kind of circular configuration of the present invention bottom as shown in drawings, it comprises the following steps: (1) choose strength cement-based grouting material as the grouting material of the flexible admixture of the first material 1, admixture as the second material 2, then test the cure shrinkage of the first material and the second material; (2) calculate the fan-shaped central angle angle ratio of the first material and the second material according to formula Angle1/Angle2=Shrinkage2/Shrinkage1, in formula, Angle1 is the fan-shaped central angle angle of every a the first material cylindrical base of occupying, Angle2 is the fan-shaped central angle angle of every a the second material cylindrical base of occupying, and Shrinkage1 and Shrinkage2 are respectively the cure shrinkages of the first material and the second material; Then calculate the fan-shaped central angle angle of the cylindrical base that every a the first material and every a the second material occupy according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data of determining in the cylindrical base border circular areas, the even number that N is >=2; (3) the fan-shaped central angle angle of the cylindrical base that every a the first material obtained according to step (2) and the second material occupy and the first material and the second material cast total block data are the fan-shaped total block data that the first material and the second material are divided in circular, at damaged border circular areas interval, circular configuration bottom, pour into a mould the first material and the second material.
Core of the present invention is bi-material, and by the form at interval, the grouting material that forms cylindrical base is reinforced (see figure 1).The first material is traditional strength cement-based grouting material, after solidifying, can shrink.The second is the grouting material of the flexible admixture of admixture, after solidifying, has expansion.
The model provided according to Fig. 2 during the angular distribution of the angle of the first material and the second material is calculated.We require is the complex that such bi-material forms, and after solidifying, the in-draw stress of generation is zero.Concrete parameter and design formulas and derivation step are as follows:
The parameter of the first material 1 is as follows:
L1 is the arc length of the sector region that occupies of every a the first material, and E1 is young's modulus of elasticity, and Shrinkage1 is the Material shrinkage rate; Sigma1 represents the stress that the first material produces after solidifying, and Epsilon1 represents the strain that the first material produces after solidifying.
The parameter of the second material 2 is as follows:
L2 is the arc length of the sector region that occupies of every a the second material 2, and E2 is young's modulus of elasticity, and Shrinkage2 is the shrinkage factor (negative shrinkage factor is expansion rate) of material; Sigma2 represents the stress that the second material produces after solidifying, and Epsilon2 represents the strain that the second material produces after solidifying.The numerical value of Shrinkage1 and Shrinkage2 is to test and to obtain by material test.
Corresponding mechanics formula is:
Sigma1=E1(Epsilon1–Shrinkage1) （1）
Sigma2=E2(Epsilon2–Shrinkage2) （2）
Consider that it is to equal zero and the dynamic balance condition that the cylindrical base body requires overall contraction or expansion along arcuate directions, can provide in model:
L1*Epsilon1-L2*Epsilon2=0 （3）
Sigma1=Sigma2 （4）
Through computing, the stress of the first material and the second material production:
Sigma1=Sigma2=E1*E2*(L1*Shrinkage1-L2*Shrinkage2)/(E1*L2+E2*L1) （5）
Further require again internal force minimum or null requirement just to obtain:
L1*Shrinkage1=L2*Shrinkage2 （6）
For the cylindrical base of Fig. 1, L1=radius * angle 1.L1=radius * angle 2, the namely ratio of the angle of bi-material:
Angle1/Angle2=Shrinkage2/Shrinkage1 （7）
Here, Angle1 is the fan-shaped central angle angle of every a the first material cylindrical base of occupying, and Angle2 is the fan-shaped central angle angle of every a the second material cylindrical base of occupying.
Then calculate the fan-shaped central angle angle of the cylindrical base that every a the first material and every a the second material occupy according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data of determining in the cylindrical base border circular areas, the even number that N is >=2; The numerical value of N can be determined according to the construction concrete condition.In theory, the numerical value of N is larger, bi-material alternate more even.But the N value is excessive, border circular areas divides that to get the piece number many, is unfavorable for construction.
Embodiment 1
Certain has the chemical industry accumulator tank of drum, and its bottom as shown in Figure 1, needs reinforcement.
(a) choose bi-material: the first material and the second material.The first material is ordinary Portland cement base grouting material, and the second material is the grouting material of the flexible admixture of admixture.
(b) test the cure shrinkage of the first material and the second material, obtain: the first material is that 0.15%, the second material is-0.20%.Negative sign in the second material means to expand.
(c), according to Shrinkage1=0.16% and Shrinkage2=0.20%, substitution formula Angle1/Angle2=Shrinkage2/Shrinkage1, obtain the angle ratio of the first material and the second material.
(d) establish the sector region that cylindrical base is divided into N part the first material and the second material altogether.The fan-shaped central angle angle of every part of first material is Angle1, and the fan-shaped central angle angle of every part of second material is Angle2, and following formula can obtain:
360=N*(Angle1+Angle2)=N*(Angle1+Angle1*Shrinkage1/Shrinkage2)=1.8*N*Angle1 （8）
By being divided into 4 constructions at the bottom of cylinder, get N=4.The above-mentioned formula of substitution (8), obtain
Angle1=50 （9）
Angle2=40 （10）
(f), according to formula (9) and formula (10) construction, at damaged border circular areas interval, circular configuration bottom, pour into a mould the first material and the second material.
Construction results shows: common cracking phenomena has obtained fine improvement.
Claims (1)
1. the reinforcement means of circular configuration bottom is characterized in that it comprises the following steps:
(1) choose strength cement-based grouting material as the grouting material of the flexible admixture of the first material, admixture as the second material, then test the cure shrinkage of the first material and the second material;
(2) calculate the fan-shaped central angle angle ratio of the first material and the second material according to formula Angle1/Angle2=Shrinkage2/Shrinkage1, in formula, Angle1 is the fan-shaped central angle angle of every a the first material cylindrical base of occupying, Angle2 is the fan-shaped central angle angle of every a the second material cylindrical base of occupying, and Shrinkage1 and Shrinkage2 are respectively the cure shrinkages of the first material and the second material; Then calculate the fan-shaped central angle angle of the cylindrical base that every a the first material and every a the second material occupy according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data of determining in the cylindrical base border circular areas, the even number that N is >=2;
(3) the fan-shaped central angle angle of the cylindrical base that every a the first material obtained according to step (2) and the second material occupy and the first material and the second material cast total block data, pour into a mould the first material and the second material at damaged border circular areas interval, circular configuration bottom.
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Citations (6)
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|---|---|---|---|---|
| GB1006541A (en) * | 1960-07-13 | 1965-10-06 | Archibald Shaw | Improvements in or relating to roads |
| FR2682141B1 (en) * | 1991-10-04 | 1998-10-02 | Sogea | PROCESS FOR REALIZING A CONSTRUCTION JOINT BETWEEN TWO PREFABRICATED ELEMENTS OF A STRUCTURE, RELATED CONSTRUCTION JOINT AND STRUCTURE COMPRISING SUCH A JOINT. |
| CN1524916A (en) * | 2003-02-28 | 2004-09-01 | 长江水利委员会长江科学院 | Underwater epoxy resin grouting material |
| KR20060072545A (en) * | 2004-12-23 | 2006-06-28 | 화평산업(주) | Manhole with resin joint using reinforcing sheet |
| CN1850931A (en) * | 2006-03-16 | 2006-10-25 | 湖南神力实业有限公司 | Stone thin sheet composite rubber, and its preparing method |
| CN103145397A (en) * | 2013-02-26 | 2013-06-12 | 上海建为建筑修缮工程有限公司 | Rapid repair material based on building broken stones and preparation method thereof |
-
2013
- 2013-08-20 CN CN201310366836.9A patent/CN103452330B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1006541A (en) * | 1960-07-13 | 1965-10-06 | Archibald Shaw | Improvements in or relating to roads |
| FR2682141B1 (en) * | 1991-10-04 | 1998-10-02 | Sogea | PROCESS FOR REALIZING A CONSTRUCTION JOINT BETWEEN TWO PREFABRICATED ELEMENTS OF A STRUCTURE, RELATED CONSTRUCTION JOINT AND STRUCTURE COMPRISING SUCH A JOINT. |
| CN1524916A (en) * | 2003-02-28 | 2004-09-01 | 长江水利委员会长江科学院 | Underwater epoxy resin grouting material |
| KR20060072545A (en) * | 2004-12-23 | 2006-06-28 | 화평산업(주) | Manhole with resin joint using reinforcing sheet |
| CN1850931A (en) * | 2006-03-16 | 2006-10-25 | 湖南神力实业有限公司 | Stone thin sheet composite rubber, and its preparing method |
| CN103145397A (en) * | 2013-02-26 | 2013-06-12 | 上海建为建筑修缮工程有限公司 | Rapid repair material based on building broken stones and preparation method thereof |
Non-Patent Citations (3)
| Title |
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| 孙增光 等: "高强度灌浆料加固钢筋混凝土结构施工技术", 《混凝土》 * |
| 杨涛 等: "交河故城土体裂隙灌浆材料性能试验", 《岩土力学与工程学报》 * |
| 汪海滨 等: "套井回填与帷幕灌浆在十八浒水库除险加固工程中的应用", 《浙江水利水电专科学校学报》 * |
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