CN103452330B - Method for strengthening circular structure bottom - Google Patents
Method for strengthening circular structure bottom Download PDFInfo
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- CN103452330B CN103452330B CN201310366836.9A CN201310366836A CN103452330B CN 103452330 B CN103452330 B CN 103452330B CN 201310366836 A CN201310366836 A CN 201310366836A CN 103452330 B CN103452330 B CN 103452330B
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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 bottom circular configuration, especially relate to the reinforcement means adopting flexible grouting agent and rigidity grouting agent interval when reinforcing bottom circular configuration.
Background technology
High-performance without vibration grouting material (concrete) reinforces and a large amount of constructional materials used of equipment installation at concrete structure design theory now.There is self drainage good, fast hard, early strong, high-strength; Nontoxic, harmless, not aging, to water quality and surrounding environment pollution-free, from features such as close property are good, antirust; There is reliable in quality at construction party mask, reduce costs, reduction of erection time and the advantage such as easy to use.But the major defect of this kind of constructional materials be because of early strength require on fast, in match ratio except cement occupancy volume is higher, multiple Admixture and additive is mixed with in it, early water heat-transmission is strong, variations in temperature in maintenance processes is larger, volume can change at the maintenance initial stage, thus easily cracked, and had influence on its impermeability, durability.
Improving grouting material one method is the flexible admixture of admixture, can increase the splitting resistance of material like this.But this flexible admixture price, also relative complex of constructing.
The patent No. is CN201020511912.2, denomination of invention is Slabstone floor system reinforcing structure disclosed in the Chinese patent of " Slabstone floor system reinforcing structure ", its composite consolidation layer formed for the modified cement mortar coating being not less than 25MPa by reinforced mesh, cement paste coating and intensity, reinforced mesh is installed on slate building roof bottom surface to be reinforced by connector laminating, cement paste coating is coated on the slate building roof bottom surface that laminating is provided with above-mentioned reinforced mesh, and modified cement mortar coating is coated in cement paste coating.This structure adopts independent modified cement mortar coating, is a kind of had and common technique.Its reinforce to as if slabstone building, its geometry is not illustrated.Problem of Cracking for common existence does not propose innovative technology path, does not propose formula of mathematical based on material engineering as the key technology in technology contents yet.
Summary of the invention
The object of the invention is to the defect overcoming prior art, the reinforcement means bottom a kind of a kind of circular configuration that can improve the anti-cracking performance of ruggedized construction part is provided.
Reinforcement means bottom a kind of circular configuration of the present invention, it comprises the following steps:
(1) choose the grouting material of strength cement-based grouting material as the first material, the flexible admixture of admixture as the second material, then test the cure shrinkage of the first material and the second material;
(2) the fan-shaped central angle angle ratio of the first material and the second material is calculated according to formula Angle1/Angle2=Shrinkage2/Shrinkage1, in formula, Angle1 is the every a first material fan-shaped central angle angle of cylindrical base of occupying, Angle2 is the every a second material fan-shaped central angle angle of cylindrical base of occupying, Shrinkage1 and Shrinkage2 is the cure shrinkage of the first material and the second material respectively; Then every a first material and the every a second material fan-shaped central angle angle of cylindrical base of occupying is calculated according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data determined in cylindrical base border circular areas, and N is the even number of >=2;
(3) the fan-shaped central angle angle of the cylindrical base that every a first material obtained according to step (2) and the second material occupy and the first material and the second material cast total block data, interregional every cast first material and the second material at the circular configuration bottom circular of breakage.
The invention has the beneficial effects as follows: utilize two kinds of grouting materials, one 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 circular region, make the two form one, play the characteristic that rigid material intensity is high and flexible material volumetric change does not ftracture and ductility is good, the anti-cracking performance of ruggedized construction part can be improved like this, in price and in construction, an equalization point can be obtained.
Accompanying drawing explanation
Fig. 1 is the first material and the second distribution of material schematic diagram of damaged circular configuration bottom circular region repairing 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 clamped.
Detailed description of the invention
Reinforcement means bottom a kind of circular configuration of the present invention as shown in drawings, it comprises the following steps: (1) chooses the grouting material of strength cement-based grouting material as the first material 1, the flexible admixture of admixture as the second material 2, then tests the cure shrinkage of the first material and the second material; (2) the fan-shaped central angle angle ratio of the first material and the second material is calculated according to formula Angle1/Angle2=Shrinkage2/Shrinkage1, in formula, Angle1 is the every a first material fan-shaped central angle angle of cylindrical base of occupying, Angle2 is the every a second material fan-shaped central angle angle of cylindrical base of occupying, Shrinkage1 and Shrinkage2 is the cure shrinkage of the first material and the second material respectively; Then every a first material and the every a second material fan-shaped central angle angle of cylindrical base of occupying is calculated according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data determined in cylindrical base border circular areas, and N is the even number of >=2; (3) the fan-shaped total block data of the fan-shaped central angle angle of the cylindrical base that every a first material obtained according to step (2) and the second material occupy and the first material and the second material cast total block data i.e. the first material and the second material division in circular, interregional every cast first material and the second material at the circular configuration bottom circular of breakage.
Core of the present invention is bi-material, and by the form at interval, the grouting material forming cylindrical base reinforces (see Fig. 1).The first material is traditional strength cement-based grouting material, after solidification, can shrink.The second is the grouting material of the flexible admixture of admixture, has expansion after solidification.
The model provided according to Fig. 2 during the angular distribution of the angle of the first material and the second material calculates.We require it is the complex that such bi-material forms, and after hardening, the interior tensile stress of generation is zero.Concrete parameter and design formulas and derivation step as follows:
The parameter of the first material 1 is as follows:
L1 is the every a first material arc length of sector region of occupying, and E1 is young's modulus of elasticity, and Shrinkage1 is material cured shrinkage factor; Sigma1 represents the stress that the first material produces after hardening, and Epsilon1 represents the strain that the first material produces after hardening.
The parameter of the second material 2 is as follows:
L2 is every a second material 2 arc length of sector region of occupying, and E2 is young's modulus of elasticity, and Shrinkage2 is the cure shrinkage (negative shrinkage factor and expansion rate) of material; Sigma2 represents the stress that the second material produces after hardening, and Epsilon2 represents the strain that the second material produces after hardening.The numerical value of Shrinkage1 and Shrinkage2 can test acquisition by material test.
Corresponding force equation is:
Sigma1＝E1(Epsilon1–Shrinkage1) (1)
Sigma2＝E2(Epsilon2–Shrinkage2) (2)
Consider along arcuate directions, cylindrical base body requires that overall contraction or expansion equal zero and dynamic balance condition, can provide in a model:
L1*Epsilon1-L2*Epsilon2＝0 (3)
Sigma1＝Sigma2 (4)
Through computing, the stress that the first material and the second material produce:
Sigma1＝Sigma2＝E1*E2*(L1*Shrinkage1-L2*Shrinkage2)/(E1*L2+E2*L1) (5)
Require that the minimum or null requirement of internal force just obtains again further:
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 every a first material fan-shaped central angle angle of cylindrical base of occupying, and Angle2 is the every a second material fan-shaped central angle angle of cylindrical base of occupying.
Then every a first material and the every a second material fan-shaped central angle angle of cylindrical base of occupying is calculated according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data determined in cylindrical base border circular areas, and N is the even number of >=2; The numerical value of N can be determined according to construction concrete condition.In theory, the numerical value of N is larger, bi-material alternate more even.But N value is excessive, border circular areas divides that to get block number many, is unfavorable for construction.
Embodiment 1
Certain has the chemical industry accumulator tank of drum, bottom it as shown in Figure 1, needs reinforcement.
A () chooses bi-material: the first material and the second material.First material is common cement-base grouting material, and the second material is the grouting material of the flexible admixture of admixture.
B () tests the cure shrinkage of the first material and the second material, obtain: the first material is the 0.15%, second material is-0.20%.Negative sign in second material represents expansion.
C (), according to Shrinkage1=0.16% and Shrinkage2=0.20%, substitutes into formula Angle1/Angle2=Shrinkage2/Shrinkage1, obtains the angle ratio of the first material and the second material.
D () establishes cylindrical base to be altogether divided into the sector region of N part first material and the second material.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 pieces of constructions at the bottom of cylinder, get N=4.Substitute into above-mentioned formula (8), obtain
Angle1＝50 (9)
Angle2＝40 (10)
F () is according to formula (9) and formula (10) construction, interregional every cast first material and the second material at the circular configuration bottom circular of breakage.
Construction results shows: common cracking phenomena obtains fine improvement.
Claims (1)
1. the reinforcement means bottom circular configuration, is characterized in that it comprises the following steps:
(1) choose the grouting material of strength cement-based grouting material as the first material, the flexible admixture of admixture as the second material, then test the cure shrinkage of the first material and the second material;
(2) the fan-shaped central angle angle ratio of the first material and the second material is calculated according to formula Angle1/Angle2=Shrinkage2/Shrinkage1, in formula, Angle1 is the every a first material fan-shaped central angle angle of cylindrical base of occupying, Angle2 is the every a second material fan-shaped central angle angle of cylindrical base of occupying, Shrinkage1 and Shrinkage2 is the cure shrinkage of the first material and the second material respectively; Then every a first material and the every a second material fan-shaped central angle angle of cylindrical base of occupying is calculated according to formula 360=N* (Angle1+Angle2), in formula, N is the first material and the second material cast total block data determined in cylindrical base border circular areas, and N is the even number of >=2;
(3) the fan-shaped central angle angle of the cylindrical base that every a first material obtained according to step (2) and the second material occupy and the first material and the second material cast total block data, interregional every cast first material and the second material at the circular configuration bottom circular of breakage.
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| CN201310366836.9A CN103452330B (en) | 2013-08-20 | 2013-08-20 | Method for strengthening circular structure bottom |
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| CN103452330B true CN103452330B (en) | 2015-07-22 |
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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. |
| CN1211451C (en) * | 2003-02-28 | 2005-07-20 | 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 |
| CN103145397B (en) * | 2013-02-26 | 2014-08-06 | 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 |
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