CN111608182A - Concrete water storage and heat preservation method for alpine regions - Google Patents
Concrete water storage and heat preservation method for alpine regions Download PDFInfo
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- CN111608182A CN111608182A CN202010439141.9A CN202010439141A CN111608182A CN 111608182 A CN111608182 A CN 111608182A CN 202010439141 A CN202010439141 A CN 202010439141A CN 111608182 A CN111608182 A CN 111608182A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/025—Adiabatic curing or hardening
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Abstract
The invention belongs to the construction field of hydroelectric engineering technology, and relates to a concrete water storage and heat preservation method in alpine regions, which comprises the following steps: 1) and (3) concrete strength inspection: before water storage, a ZCA-A type concrete resiliometer is adopted to detect the strength of the poured concrete; 2) filling dam concrete with water: before water storage, marked water level marks are made on the excavated dam slope so as to observe the water level in the foundation pit. The water storage adopts the pumping displacement of 100m3H and 150m3Pumping water to a concrete surface from the downstream by two water pumps, and storing the water to an EL2519.0 elevation; 3) observing water level change: arranging a specially-assigned person to watch during the water storage period, observing the water level change condition of the water storage layer every 6 hours in the daytime, observing for 1 time at night, filling in observation records in detail, and starting the water replenishing pump immediately when the person on duty finds that the water level is lower than the water level line marked by the side slope in advance.
Description
Technical Field
The invention belongs to the construction field of hydroelectric engineering technology, and relates to a concrete water storage and heat preservation method in alpine regions.
Background
The conventional concrete heat preservation method mainly adopts sand, cotton quilt, canvas and other heat preservation materials to cover so as to achieve the heat preservation effect.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a concrete water storage and heat preservation method in alpine regions.
In order to achieve the purpose, the invention adopts the following technical scheme: a concrete water storage and heat preservation method for alpine regions comprises the following steps:
1) and (3) concrete strength inspection: before water storage, a ZCA-A type concrete resiliometer is adopted to detect the strength of the poured concrete;
2) filling dam concrete with water: before water storage, marked water level marks are made on the excavated dam slope so as to observe the water level in the foundation pit; the water storage adopts the pumping displacement of 100m3H and 150m3Pumping water to a concrete surface from the downstream by two water pumps, and storing the water to an EL2519.0 elevation;
3) observing water level change: arranging a specially-assigned person to watch during the water storage period, observing the water level change condition of the water storage layer every 6 hours in the daytime, observing for 1 time at night, filling in observation records in detail, and starting the water replenishing pump immediately when the person on duty finds that the water level is lower than the water level line marked by the side slope in advance.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for water storage and heat preservation on the surface of poured concrete, which reduces the cost of concrete heat preservation; according to the physical characteristics of the material, water has certain heat resistance, is usually in a heat release state when being frozen, has latent heat of 336kj/kg when being frozen, and can be used as a relatively heat-insulating heat-preserving material. The dam concrete surface water storage can effectively prevent the invasion of the external cold temperature to the poured surface, ensure that the concrete surface is always in a normal temperature state, form a water curing condition in a natural state, promote the hydration of cement, increase the strength of concrete and resist concrete cracks.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a schematic view of the present invention illustrating the insulation of poured concrete.
The labels in the figures are: 1. side lines are excavated on the upstream side slope; 2. side lines are excavated on the downstream side slope; 3. storing water with the thickness of 4 m; 4. the concrete is poured; 5. and (5) building a base surface.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
Please refer to fig. 1, which illustrates a method for water storage and heat preservation of concrete in alpine regions, comprising the following steps:
the water storage source adopts the seepage of water gushing formed by the downstream of the riverbed through the factory-entering traffic flowing into the foundation pit and the cofferdams at the upstream and the downstream of the dam as the supply of the water source.
The process flow is as follows: concrete strength inspection → dam concrete filling → impoundment to EL2519.0 elevation → observation of water level change.
1) And (3) concrete strength inspection: before water storage, a ZCA-A type concrete resiliometer is adopted to detect the strength of the poured concrete 4;
2) filling dam concrete with water: an upstream side slope excavation side line 1, a downstream side slope excavation side line 2 and poured concrete 4 are arranged on the upper portion of the foundation surface 5, a water storage area is formed between the upstream side slope excavation side line 1, the downstream side slope excavation side line 2 and the poured concrete 4, a water storage layer 3 with the thickness of 4m is arranged in the water storage area, and striking water level marks are made on the excavated dam side slope before water storage so as to observe the water level in the foundation pit. The water storage adopts the pumping displacement of 100m3H and 150m3Pumping water to a concrete surface from the downstream by two water pumps, and storing the water to an EL2519.0 elevation;
3) observing water level change: arranging a specially-assigned person to watch during the water storage period, observing the water level change condition of the water storage layer 3 every 6 hours in the daytime, observing for 1 time at night, filling in observation records in detail, and starting the water replenishing pump immediately when the person on duty finds that the water level is lower than the water level line marked by the side slope in advance.
The water storage and heat preservation have problems and countermeasures: if the concrete is not filled in time, the problem of frost heaving of the concrete can occur, the frost heaving mainly occurs in a water level change area, and the water level does not reach the set water level before the air temperature suddenly drops; during the water storage and heat preservation period, the water level is unstable and changes greatly, so that the pulling force of an ice layer to a concrete surface is increased, frost heaving is formed, the observation of the water level is enhanced, the stability of the water level during the water storage and heat preservation period is ensured, the water level is controlled to be not lower than EL2519.0m, and the water filling time formed on the top surface of the concrete of the root dam is short, so that the water level of a downstream river channel rises rapidly, and the phenomenon is avoided.
After the implementation of the overwintering water filling and heat preservation of dam concrete, data measured by an embedded thermometer shows that after the water filling and heat preservation of a dam site area, the atmospheric temperature is-8.4 ℃ to-17.1 ℃, the internal temperature of a dam body is always kept between 9.4 ℃ and 11.8 ℃, the temperature of an underwater heat preservation layer is between 5.3 ℃ and 6.4 ℃, and the surface temperature of concrete is slightly higher than that of the underwater heat preservation layer, so that the temperature monitoring data shows that the internal temperature and the surface temperature of the concrete are kept at normal temperature, the internal and external temperature difference of the dam body concrete is extremely small, and the control of the overwintering water filling protection temperature of the dam concrete meets the requirement.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (1)
1. A concrete water storage and heat preservation method for alpine regions is characterized by comprising the following steps:
1) and (3) concrete strength inspection: before water storage, a ZCA-A type concrete resiliometer is adopted to detect the strength of the poured concrete;
2) filling dam concrete with water: before water storage, marked water level marks are made on the excavated dam slope so as to observe the water level in the foundation pit; the water storage adopts the pumping displacement of 100m3H and 150m3Pumping water to a concrete surface from the downstream by two water pumps, and storing the water to an EL2519.0 elevation;
3) observing water level change: arranging a specially-assigned person to watch during the water storage period, observing the water level change condition of the water storage layer every 6 hours in the daytime, observing for 1 time at night, filling in observation records in detail, and starting the water replenishing pump immediately when the person on duty finds that the water level is lower than the water level line marked by the side slope in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010439141.9A CN111608182A (en) | 2020-05-22 | 2020-05-22 | Concrete water storage and heat preservation method for alpine regions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010439141.9A CN111608182A (en) | 2020-05-22 | 2020-05-22 | Concrete water storage and heat preservation method for alpine regions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111608182A true CN111608182A (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010439141.9A Pending CN111608182A (en) | 2020-05-22 | 2020-05-22 | Concrete water storage and heat preservation method for alpine regions |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327450A (en) * | 1999-05-12 | 2000-11-28 | Shimizu Corp | Concrete placing method |
| CN104018673A (en) * | 2013-09-12 | 2014-09-03 | 江苏绘天建筑安装工程有限公司 | Extra-huge-volume concrete one-time continuous pouring multi-cycle real-time temperature control construction technology |
| CN110593263A (en) * | 2019-09-20 | 2019-12-20 | 中电建十一局工程有限公司 | Construction method for overwintering protection of foundation pit concrete in severe cold region |
-
2020
- 2020-05-22 CN CN202010439141.9A patent/CN111608182A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327450A (en) * | 1999-05-12 | 2000-11-28 | Shimizu Corp | Concrete placing method |
| CN104018673A (en) * | 2013-09-12 | 2014-09-03 | 江苏绘天建筑安装工程有限公司 | Extra-huge-volume concrete one-time continuous pouring multi-cycle real-time temperature control construction technology |
| CN110593263A (en) * | 2019-09-20 | 2019-12-20 | 中电建十一局工程有限公司 | Construction method for overwintering protection of foundation pit concrete in severe cold region |
Non-Patent Citations (2)
| Title |
|---|
| 刘景全等: "奋斗水库碾压混凝土重力坝施工质量控制措施", 《黑龙江水利科技》 * |
| 刘洋: "高寒地区混凝土越冬蓄水保温方案的研究与应用", 《黑龙江水利科技》 * |
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Application publication date: 20200901 |
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