Beijing e-dingxing group is firmly committed to move forward, paying attention to the high labor intensity of construction workers in summer, prone to excessive fatigue and heatstroke, which is a period of frequent accidents
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Personnel of all types of work should pay attention to the following points: construction preparation work in summer 1
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Mobilize employees to actively take effective heatstroke prevention measures according to the actual situation of construction and production, give full play to the effectiveness of existing cooling equipment, add necessary cooling facilities, and do a good job of inspection and maintenance in time
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2
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Pay attention to the production and life of workers, 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
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3
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Pay attention to prevent the occurrence of infectious diseases and ensure food hygiene
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4
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Pay attention to prevent fire
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Guarantee measures for reinforcement construction in the second summer: 1
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When the reinforcement materials are transported from the reinforcement processing plant to the construction site, attention should be paid to the safety in the transportation process
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The reinforcement should be bound firmly in the transportation process to prevent the reinforcement from falling
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Especially when the reinforcement is too long, safety warning signs should be added on the vehicles, and special care should be taken when the vehicles turn and go up and down the slope
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2
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After the acceptance of the semi-finished reinforcement, it should be placed in a specific place, not on the slope or in the safe passage
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The reinforcement should be placed in an open area, which is convenient for construction and does not affect the traffic
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3
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In summer construction, waterproof and rust proof measures shall be taken at the semi-finished products stacking place in the reinforcement processing plant and construction site
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It is strictly forbidden to stack the reinforcement at will
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Transportation and stacking shall be arranged in a unified way
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For the arrival of flood season, preparation measures shall be taken in advance to clean up the sundries and ponding in the reinforcement stacking area in time
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Square wood shall be padded at the bottom of reinforcement stacking to prevent the corrosion of reinforcement caused by ponding, In rainy weather, the reinforcement should be covered with geomembrane, and the geomembrane should be checked for water leakage
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If there is water leakage, it should be replaced in time; It is strictly forbidden to stack the steel bars on the excavated plain soil, which is easy to make the square wood sink into the soil, make the steel bars directly contact with the soil, and cause the steel bars to rust
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4
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Because the outdoor temperature of construction in summer is high, the surface temperature of steel bars is too high after being exposed to the sun
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When carrying steel bars, workers are strictly forbidden to directly touch the steel bars with bare hands, so as to avoid scalding; The geomembrane covered on the steel bar can also play the role of sun protection
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5
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Steel workers should take protective measures when binding steel bars, especially when binding steel bars on the main external wall
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Due to the narrow construction surface, they should pay more attention to safety during construction
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3
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Guarantee measures for formwork construction in summer 1
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When the construction formwork is stacked in summer, fire-fighting equipment should be placed in the site to avoid fire caused by dry temperature
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2
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When materials are stacked in a centralized way, special personnel shall be arranged for inspection, and no open fire is allowed on site
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3
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The construction formwork, beam and wall formwork must be provided with a cleaning opening or water outlet
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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
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4
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If the steel pipe frame material is supported on the backfill soil, the sleeper and base plate shall be well padded
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After the rain, the firmness and stability of the formwork and support as well as the section size of the formwork shall be checked in time
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5
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The wooden formwork used in rainy days should be removed and leveled to avoid deformation and cleaned in time
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If the release agent is brushed, it should be brushed again after heavy rain
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6
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The concrete shall be poured as soon as possible after the formwork is assembled to prevent the formwork from deformation in the sun and rain
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If the concrete cannot be poured in time after the formwork is assembled, and it is drenched by rain, the formwork and support shall be reinforced by re inspection before concrete pouring
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7
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Formwork and components: the stacking site shall be hardened and firmly inserted
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For the formwork erected in rainy days, the formwork and support shall be carefully inspected before pouring concrete after raining to prevent loosening of formwork support
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8
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When the large formwork falls to the ground, the ground shall be solid and firmly supported
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9
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The formwork and square timber used for the main structure shall be lifted to the designated stockyard in time after being removed to prevent the formwork and square timber from being exposed to the sun and rain
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Guarantee measures for concrete construction in summer 1
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Mix proportion adjustment According to the construction environment, reasonable adjustment of summer construction mix proportion
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The slump loss should be fully considered when adjusting the mix proportion
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In order to reduce the slump loss of concrete and avoid the concentration of hydration heat, the raw materials can be adjusted to select the cement with lower hydration heat, and the setting time of concrete can be delayed by adjusting the amount of composite admixture to meet the construction requirements
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2
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The mixing and transportation of concrete in hot season should take effective measures to control the mixing temperature of concrete
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The mixing temperature of concrete can be reduced by mixing with low temperature water, washing the aggregate with cold water and taking measures to control the temperature of cement entering the machine
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3
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When pouring concrete in hot climate, the time should be adjusted, the construction working face should be properly arranged, the concrete construction should be carried out at night or in the morning when the ambient temperature is low, and the high temperature time at noon or afternoon should be avoided; Sufficient manpower, equipment and machines and tools shall be provided to cope with the unfavorable 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 well controlled at any time
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4
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If the concrete is not properly maintained, the strength of concrete will be reduced or plastic shrinkage cracks will appear on the surface
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Therefore, the maintenance of concrete must be strengthened
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5
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Concrete quality requirements: 1
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Timely concrete curing
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In the process of concrete pouring, in order to reduce the exposure time of concrete surface and prevent the evaporation of water on the concrete surface, non absorbent materials such as plastic film can be used for pouring and covering at the same time
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After the initial setting and plastering, the curing process can be formally started
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② If manual sprinkling and spray curing are adopted, the concrete surface can be covered (wrapped) tightly with geotextile, sack, cotton felt and other absorbent materials, without exposing edges and corners, and the interval of sprinkling is short
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Keep moisture inside and outside the covering from beginning to end to prevent drying and wetting cycle
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Generally speaking, the curing water temperature should not be lower than 15 ℃, and the difference between the curing water temperature and the surface temperature of concrete should not be higher than 15 ℃, in order to prevent concrete surface cracks
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③ If the concrete surface is wrapped with plastic film for moisture conservation, the plastic film shall have certain crack resistance, tensile strength and flexibility
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After demoulding, the concrete surface should be watered and immediately wrapped tightly
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The plastic film should be close to the concrete surface without leakage and air permeability
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During the curing period, water droplets will appear on the concrete surface from beginning to end
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In order to keep the concrete surface moist, spray water into the plastic film regularly, and check the integrity of the film frequently
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If the plastic film is found to be broken, it should be repaired in time
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④ According to different weather, temperature conditions and different structural characteristics, the curing period of HPC should be controlled within 14-28 days
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During this curing period, the heat insulation curing measures should be adopted to ensure that the curing humidity of concrete meets the requirements, so that the hydration of concrete can be carried out smoothly
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⑤ The maintenance of high performance concrete should be in the charge of a special person, and a special responsibility system should be established
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During the maintenance period, it is necessary to inspect in time, find problems, solve them in time, pay attention to details, make records, and comprehensively implement maintenance measures
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5
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Heatstroke prevention (1) strengthen heatstroke prevention education
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The heatstroke prevention team shall regularly carry out heatstroke prevention safety education and publicity for each operation team, so that everyone can master the safety knowledge of heatstroke prevention, and improve the adaptability and handling ability of operators in operation
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Everyone should master the precautions in the construction process in summer and know how to protect themselves; Help others
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Post summer knowledge in front of the construction site office, and announce the daily temperature on the blackboard of the construction site, so that the construction personnel can know the temperature of the day in time.
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