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The attention of shanxi solar photovoltaic power station in cold winter construction!


Release date:(2018-1-10)   Number of clicks:142
The winter of 2017 is colder than before. What should be paid attention to during this cold winter solar photovoltaic power station construction? The following is with shaanxi odi engineering lighting co., LTD.
· earthwork project...
Can earthwork be constructed in winter? It can but not be suitable, if must be in winter construction, its construction method should be confirmed by technical economy comparison. Plan carefully before construction, and be ready for continuous construction. The key to the construction of earthwork in winter is backfill.
Excavation of the earth.

When using the method of preventing freezing, the soil can be covered with thermal insulation material before freezing, or the topsoil can be turned up and raked, and the depth of ploughing is determined according to local climatic conditions, generally not less than 30cm.

Notice of construction backfill in winter.
1. During the winter period, the soil thickness of each layer should be reduced by 20% ~ 25% compared with the normal temperature construction, and the reserved sedimentation rate should be increased appropriately than the normal temperature construction.
2. The following provisions shall be met in the winter period:
(1) the snow and ice and insulation materials on the base should be cleared before filling the soil;
(2) it is not allowed to fill the surface of the slope of the slope with the frozen soil;
(3) the frozen soil block in the packing should be evenly distributed and compacted, and its content should meet the design requirements.
3. The filling in the ground floor shall not contain frozen soil block, and the anti-freezing measures shall be taken before the completion of the filling to the ground.
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1. How is the compressive strength of concrete in winter?
(1) the concrete made of Portland cement or Portland cement is 30% of the standard value of the designed concrete.
(2) the slag Portland cement mixing of concrete, for the design of the concrete strength standard values of 40%, but no more than C10 concrete, shall not be less than 5.0 N / ㎡.
2. How to configure concrete for winter construction?
(1) Portland cement or Portland cement should be preferred in the preparation of concrete for winter construction.
(2) cement strength grade should not be lower than 32.5, minimum cement consumption should not be less than 300kg/m3, water cement ratio should not be greater than 0.6.
(3) concrete with anti-freeze agent is used, and high alumina cement is strictly prohibited.
(4) the aggregate used for concrete must be clean, and shall not contain frozen substances such as ice and snow, and minerals that are easy to crack.
(5) in concrete mixed with potassium and sodium ion antifreeze, the active aggregates should not be mixed.
3. What is the addition of concrete admixture in winter?
(1) concrete that is cast in winter season should be used without chlorine antifreeze. For concrete with high resistance to frost resistance, it is advisable to use air or gas reducing agent.
(2) when the concrete is used, the chloride content shall not exceed 3% of the cement weight.
4. What is the requirement of winter concrete mix?
(1) the preparation of antifreeze solution and the dosage of antifreeze should comply with the relevant provisions of the current national standards.
(2) strictly control the water cement ratio of concrete, and the water in the water and antifreeze solution brought by the aggregate should be deducted in the mixing water.
(3) apply hot water or steam to the mixer before stirring, and the stirring time should be 1.5 times of the normal temperature stirring time.
(4) concrete mixture of temperature should not be below 10 ℃, the machine into the mould temperature should not be less than 5 ℃.

5. What are the requirements for concrete construction in winter?
(1) concrete shall clear the ice and dirt on the template before pouring.
(2) containers for transport and concreting shall have insulation measures.
(3) the template and the thermal insulation layer should be behind the concrete cooling to 5 ℃ can be removed.
(4) when the concrete temperature difference with the outside world more than 20 ℃, the concrete surface after dismantle the slow cooling of the temporary cover measures should be taken.
6. What needs to be paid attention to in winter concrete temperature measurement?
(1) the temperature is recorded at 8, 12, 16 and 20 at 8, 12, 16 and 20, respectively.
(2) no less than 4 times per shift of concrete can and mold temperature.
(3) when the physical temperature is measured, the temperature measuring element shall be isolated from the external temperature. The measuring position of the temperature measuring element shall be 20mm under the structure surface, and shall be placed in the temperature hole for no less than 3min.
7. How to arrange the temperature hole in winter concrete?
(1) the temperature measuring hole is generally located in the representative structural parts and the temperature changes large and easy to cool.
(2) the temperature hole on the beam shall be perpendicular to the axis of the beam, and the hole shall be 1/3 to 1/2 of the height of the beam.
(3) floor thermometer hole arrangement according to the vertical and horizontal direction is not greater than 5 m span arrangement, each room area is not greater than 20 ㎡ to set a thermometer hole, thermometer hole perpendicular to the surface, hole deep thickness of 1/3 to 1/2.
(4) when the wall thickness is 20cm and 20cm, the temperature hole is set on the single side, and the hole is 1/2 of the thickness of the wall. When the wall thickness is greater than 20 cm, double set thermometer hole, hole deeply the 1/3 of wall thickness, is not less than 10 cm thermometer hole with the plate into 30 ° Angle. The temperature hole of large area wall is not larger than 5m in vertical and horizontal direction; Each area is less than 20 ㎡ of metope, can set a thermometer hole each side.
(5) cast-in-place reinforced concrete column: a temperature hole is set at the bottom of each column.
(6) before casting the concrete, the white iron pipe with a length of 150mm (10mm in diameter) is prepared in advance, and the two ends are sealed with adhesive cloth. When pouring, the temperature tube is placed according to the predrawn temperature hole layout.
(7) when the negative temperature curing method is adopted, it should be measured every 2h before reaching the frozen critical strength.
(8) the concrete can stop measuring temperature after reaching the critical strength of freezing.

8. What is the special place of winter concrete curing?
(1) in the case of negative temperature, the water is strictly forbidden and the surface must be covered.
(2) the initial curing temperature of the concrete shall not be lower than the prescribed temperature of the antifreeze, and the insulation measures shall be taken immediately when the temperature is not reached.
(3) of concrete mixed with antifreeze, when the temperature dropped below the regulation of antifreeze temperature, its strength should not be less than 3.5 N / ㎡.
(4) when dismantle the surface of the concrete temperature and environmental temperature difference is greater than 15 ℃, deal with concrete using heat preservation material covered curing.
The above mentioned points are the attention of shaanxi solar photovoltaic power station in the cold winter construction, I hope you can read more.



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The winter of 2017 is colder than before. What should be paid attention to during this cold winter solar photovoltaic power station construction? The following is with shaanxi odi engineering lighting co., LTD. · earthwork project · earthwork can be constructed in winter? It can but not be suitable, if must be in winter construction, its construction method should be confirmed by technical economy comparison. Plan carefully before construction, and be ready for continuous construction. The key to the construction of earthwork in winter is backfill. Open...    Technical support:btoe
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