CN103195025A - Cracking protection method for concrete dams - Google Patents
Cracking protection method for concrete dams Download PDFInfo
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- CN103195025A CN103195025A CN2013101262149A CN201310126214A CN103195025A CN 103195025 A CN103195025 A CN 103195025A CN 2013101262149 A CN2013101262149 A CN 2013101262149A CN 201310126214 A CN201310126214 A CN 201310126214A CN 103195025 A CN103195025 A CN 103195025A
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Abstract
The invention discloses a cracking protection method for concrete dams. During construction of a concrete dam, insulation material is arranged on the upstream surface of a dam body. After certain strength of dam concrete is reached, sand is manually filled on the upstream side of the insulation material. Soil filled in front of the dam and the insulation material jointly act to protect the dame in construction period in cold seasons or increase dam-front reservoir water temperature in dam operation period to decrease temperature difference, so that dam cracking is protected. The feature that bottom water temperature rises and sediment accumulation occurs in front of the dam due to density flow of entering sediment generated in front of the dam after operation is utilized fully, dam cracking protection measures and construction dam temperature control measures are simplified, temperature control is easier, temperature control cost is lower, engineering investment is lower, and fine economic benefit is obtained.
Description
Technical field
The present invention relates to the guard method of a kind of dam body anticracking, concrete dam body anticracking guard method in especially a kind of Hydraulic and Hydro-Power Engineering.
Background technology
Concrete dam type dam body is in construction period during low temperature season, if dam body and basic constraint district temperature thereof are higher, differ bigger with temperature, then may there be risk low owing to the early stage tensile strength of dam concrete, that the construction period thermal stresses causes the dam body cracking greatly, be subjected to the stronger dam body strong constraint district cracking risk of basic rock mass effect of contraction bigger.For preventing the dam body cracking, need whole dam body, especially dam body strong constraint district carries out the protection of low temperature season.In addition, the dam body temperature is higher than the dam body steady temperature field during as if retaining, then will have the problem of runtime load and construction period residual temperature load stack, and it is improper to control, and will cause the dam body cracking, therefore, also needs protect dam body.
Conventional safeguard measure is generally: (1) strengthens dam body temperature control dynamics, make the dam body temperature in the temperature difference of construction period low temperature season and boundary temperature, or control in reasonable range with the temperature difference of dam body equilibrium temperature before the retaining, wherein particularly strict to temperature difference requirement and the temperature control measures in dam body strong constraint district; (2) on the dam concrete surface heat insulating material is set.Often the temperature control cost is higher for this method.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of and can reduce dam body temperature and temperature requirements, especially dam body strong constraint district required, and satisfies the guard method of the simple concrete dam body anticracking of dam body anticracking safety and method again.
The technical solution adopted in the present invention is that the guard method of a kind of concrete dam body anticracking may further comprise the steps:
(1) in the concrete dam body work progress, on the upstream side surface of dam body heat insulating material is set;
(2) after dam concrete has certain intensity, in heat insulating material upstream side certain limit, manually fill sand.
The scope that described sand fills is concrete dam body basic constraint district's scope or the scope that needs protection.
The scope of silt is not less than the scope of the sand that manually fills before the dam before the dam, operation back.
The invention has the beneficial effects as follows: improved construction period and retaining phase especially retaining initial dam body stress state, temperature requirements and temperature control difficulty have been reduced, simplified construction period dam body temperature control measures, saved the temperature control cost, thereby reduced construction investment, obtain good economic benefit, can be similar engineering and use for reference, have dissemination.
Description of drawings
Fig. 1 is the structural representation of concrete dam body anticracking protection of the present invention.
Among the figure:
1---dam body;
2---heat insulating material;
3---the sand that manually fills.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
The present invention takes full advantage of operation back warehouse-in silt and causes forming density current before the dam and the bottom of the reservior water temperature is raise and will form the characteristics that silt deposits before the dam; in advance before dam body, manually fill sand in the silt alluvial scope; sand and heat insulating material synergy; played the anticracking protective effect to dam body; thereby reduced the requirement to dam body temperature and the extraneous temperature difference, simplified temperature control measures.Be specially:
(1) is provided with heat insulating material on dam body upstream side surface; (2) in dam body basic constraint district and in the scope of silt alluvial before being the runtime dam, fill sand in the outside of heat insulating material.The soil body that fills before the dam and heat insulating material synergy in order to the retaining water temperature before carrying out construction period low temperature season dam body protection or improving dam runtime dam, reducing the temperature difference, thereby reach the purpose of dam body anticracking protection; Dam concrete when (3) sand fills in the reclamation district scope should have certain intensity.
As shown in Figure 1, certain medium hydropower station engineering, dam is rolled concrete arch dam, maximum height of dam 107m, dam body strong constraint district scope is the above about 30m of dam foundation foundation plane.RCCD (Roller Compacted Concrete Dam) body construction storehouse face is bigger, and the rate of climb is very fast, and temperature control measures is limited, and construction period dam body temperature is higher.Theory analysis and engineering practice all show, if do not take measures to control construction period and runtime dam body temperature, especially strong constraint district dam body temperature, will may have the risk of cracking owing to excessive temperature differentials causes dam body, thereby influence the safety of dam body.
Because dam body is built about 30 months of duration, the problem that exists the construction period dam body to survive the winter and protect.As shown in Figure 1; before arriving winter 1 year dam body construction period; upstream side at dam body 1 is provided with heat insulating material 2; and in the strong constraint district; be in the above about 30m scope of dam foundation foundation plane; the approximate place of silt the sedimentation elevation basic and runtime is provided with the sand 3 that manually fills, and survives the winter in order to protect dam body.Dam concrete when requiring sand to fill in the reclamation district scope should have certain intensity.
Theory analysis and engineering practice show that all the silt in the river will cause the bottom of the reservior to have the density current phenomenon, thereby and make bottom of the reservior water temperature rising that the equilibrium temperature of dam body bottom is increased.There is certain gap in dam body temperature before the retaining of engineering barrage apart from steady temperature field, owing to filled artificial sand 3 in advance in the construction period, thereby the bottom of the reservior water temperature before the retaining initial dam just existing institute improve, under the prerequisite of controlling the temperature difference, the dam body temperature can increase during retaining.
Owing to outside the insulation layer 2 of dam body 1, be provided with the sand 3 that manually fills again, reduced the temperature difference, improved construction period and the retaining phase dam body stress state at retaining initial stage especially, reduce dam body temperature requirements and temperature control difficulty, simplified construction period dam body temperature control measures, saved the temperature control cost, thereby reduced construction investment, obtain good economic benefit, can be similar engineering and use for reference, have dissemination.
Above-described embodiment only is used for explanation technological thought of the present invention and characteristics, its purpose is to make those skilled in the art can understand content of the present invention and implements according to this, can not only limit claim of the present invention with present embodiment, be equal variation or the modification that all disclosed spirit is done, still drop in the claim of the present invention.
Claims (3)
1. concrete dam body anticracking guard method is characterized in that, may further comprise the steps:
(1) in the concrete dam body work progress, on the upstream side surface of dam body (1) heat insulating material (2) is set;
(2) after dam concrete has certain intensity, in heat insulating material (2) upstream side certain limit, manually fill sand (3).
2. concrete dam body anticracking according to claim 1 guard method is characterized in that, the scope that described sand fills is concrete dam body basic constraint district's scope or the scope that needs protection.
3. concrete dam body anticracking according to claim 2 guard method is characterized in that, the scope of silt is not less than the scope of the sand (3) that manually fills before the dam before the dam, operation back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101262149A CN103195025A (en) | 2013-04-12 | 2013-04-12 | Cracking protection method for concrete dams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101262149A CN103195025A (en) | 2013-04-12 | 2013-04-12 | Cracking protection method for concrete dams |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103195025A true CN103195025A (en) | 2013-07-10 |
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ID=48717830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101262149A Pending CN103195025A (en) | 2013-04-12 | 2013-04-12 | Cracking protection method for concrete dams |
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| Country | Link |
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| CN (1) | CN103195025A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107587483A (en) * | 2017-08-31 | 2018-01-16 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of structure and its construction method that face dam bold shore slope is filled using compound |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2506694Y (en) * | 2001-09-14 | 2002-08-21 | 宜昌天宇科技有限公司 | Dam capable of preventing surface from cracking |
| JP2011168978A (en) * | 2010-02-16 | 2011-09-01 | Kajima Corp | Construction method of concrete dam body |
-
2013
- 2013-04-12 CN CN2013101262149A patent/CN103195025A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2506694Y (en) * | 2001-09-14 | 2002-08-21 | 宜昌天宇科技有限公司 | Dam capable of preventing surface from cracking |
| JP2011168978A (en) * | 2010-02-16 | 2011-09-01 | Kajima Corp | Construction method of concrete dam body |
Non-Patent Citations (1)
| Title |
|---|
| 夏世法等: ""高寒地区碾压混凝土坝岸坡坝段保温方案研究"", 《中国水利水电科学研究院学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107587483A (en) * | 2017-08-31 | 2018-01-16 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of structure and its construction method that face dam bold shore slope is filled using compound |
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Application publication date: 20130710 |