In the process of concrete pouring, in order to reduce the exposure time of the concrete surface and prevent the evaporation of water on the concrete surface, plastic film and other non absorbent materials can be used to pour and cover at the same time.
The reinforcement workers shall take protective measures when binding the reinforcement, especially when binding the reinforcement of the main external wall.
After the rain, the firmness and stability of the formwork and support as well as the sectional dimension of the formwork shall be checked in time.
Mobilize workers to actively take effective heatstroke prevention and cooling measures according to the actual situation of construction and production, give full play to the efficiency of existing cooling equipment, add necessary cooling facilities, and timely carry out inspection and maintenance.
During the transportation of reinforcement materials from the reinforcement processing plant to the construction site, attention shall be paid to safety.
When formworks are stacked in summer, fire-fighting equipment shall be placed in the site to avoid fire caused by dry temperature.
6.
Because the outdoor temperature of the construction is high in summer, the surface temperature of the reinforcement is too high after exposure to the hot sun, and the reinforcement workers are strictly prohibited from directly contacting the reinforcement with bare hands when handling the reinforcement, so as to avoid scalding; The geomembrane covered on the reinforcement can also play a role in sunscreen.
After the semi-finished reinforcement is accepted, it shall be placed in a specific place, not on the slope or in the safe passage.
For the arrival of flood season, preparation measures shall be taken in advance to timely clean up the sundries and ponding in the reinforcement stacking area.
guarantee measures for formwork construction in summer 1.
When materials are stacked in a centralized manner, special personnel shall be arranged for patrol inspection, and there shall be no open fire on the site.
After the formwork release agent is painted, it shall be covered with plastic cloth in case of rain to prevent the isolation layer from being washed away by rain.
Curing of concrete for concrete poured in summer, if not properly cured, the concrete strength will be reduced or plastic shrinkage cracks will appear on the surface.
5.
If the steel pipe rack material is supported on the backfill, sleepers and backing plates shall be padded.
The construction formwork, beam and wall formwork must be provided with cleanouts or water outlets.
Assurance measures for reinforcement construction in summer 1.
preparation for construction in summer 1.
Square timber shall be placed at the bottom of the reinforcement stacking to prevent ponding from rusting the reinforcement.
5.
When the large formwork falls to the ground, the ground shall be solid and firmly supported.
4.
In rainy weather, the reinforcement shall be covered with geomembrane, Check whether the geomembrane has water leakage.
3.
Therefore, the curing of concrete must be strengthened.
Due to the narrow construction surface, they shall pay more attention to safety during construction.
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The slump loss shall be fully considered when adjusting the mix proportion.
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7.
Formwork and components: the stacking site shall be hardened and firmly inserted.
Mixing and transportation of concrete effective measures shall be taken to control the mixing temperature of concrete in hot seasons.
If the concrete cannot be poured in time after the formwork is assembled, and is drenched by rain, the formwork and support shall be rechecked before pouring concrete.
IV.
assurance measures for concrete construction in summer 1.
Pay attention to the production and life of employees, pay attention to the combination of work and rest, adjust work and rest time, strictly control overtime, pay close attention to the physical examination of workers working at high temperature and high altitude before entering the summer, and properly change the work that is not suitable for high temperature and high altitude operation.
3.
After the formwork is assembled, the concrete shall be poured as soon as possible to prevent the formwork from deformation in the sun and rain.
The reinforcement shall be placed in an open area, which is convenient for construction and does not affect the traffic.
Pay attention to prevent infectious diseases and ensure food hygiene.
When pouring concrete in a hot climate, the time shall be adjusted, the construction face shall be properly arranged, the concrete construction shall be carried out at night or in the morning when the ambient temperature is low, and the high temperature time at noon or afternoon shall be avoided; Sufficient manpower, equipment and machines and tools shall be provided to cope with the adverse situation that the concrete cannot reach, and the temperature difference between the concrete surface and the outside and between the concrete interior and the surface shall be controlled at any time.
The formwork and square timber used for the main structure shall be lifted to the designated stockyard in time after removal to prevent the formwork and square timber from being exposed to the sun and rain.
8.
The concrete mixing temperature can be reduced by mixing with low-temperature water, washing the aggregate with cold water, and taking measures to control the cement feeding temperature.
In order to reduce the slump loss of concrete and avoid the concentration of hydration heat, the cement with low hydration heat can be adjusted for raw materials, and the setting time of concrete can be delayed by adjusting the amount of composite admixture to meet the construction requirements.
For the formwork erected in rainy days, before pouring concrete after the rain, the formwork and support shall be carefully checked to prevent the formwork support from loosening.
I.
After the initial setting plastering and mortar collection, the curing process can be formally started.
Especially when the reinforcement is too long, safety warning signs shall be added on the vehicle, and the vehicle shall be extra careful when turning and going up and down the slope.
The reinforcement shall be bound firmly during the transportation to prevent the falling of reinforcement during the transportation.
Concrete quality requirements ① concrete curing shall be timely.
3.
II.
The release agent shall be applied again in case of heavy rain.
Generally speaking, the curing water temperature should not be lower than 15 ℃, and the difference between the curing water temperature and the concrete surface temperature should not be higher than 15 ℃, so as to prevent concrete surface cracks..
4.
During summer construction, waterproof and anti rust measures shall be taken at the reinforcement processing plant and the semi-finished product stacking place on the construction site.
3.
② if manual watering and spraying curing are adopted, the concrete surface can be covered (wrapped) tightly with geotextile, gunny bag, cotton felt and other absorbent materials, without exposed edges and corners, and the interval of watering and spraying is short.
2.
Mix proportion adjustment adjust the mix proportion of summer construction reasonably according to the construction environment.
Moisture shall be kept inside and outside the cover all the time to prevent drying and wetting cycle.
The wooden formwork used in rainy days shall be leveled after being removed to avoid deformation and cleaned in time.
Reinforcement shall not be stacked at will, but shall be transported and stacked in a unified manner.
5.
If there is water leakage, replace it in time; It is strictly forbidden to stack the reinforcement on the excavated plain soil, which is easy to sink the square timber into the soil, so that the reinforcement and the soil can be in direct contact, resulting in reinforcement corrosion.
Pay attention to prevent fire.
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III.
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