What should be paid attention to in the construction of high temperature weather in summer

Summer construction preparation

Mobilize workers, actively take effective heatstroke prevention and cooling measures according to the actual situation of construction production, give full play to the efficiency of existing cooling equipment, acquire necessary cooling facilities, and do a good job in inspection and maintenance in time.

Pay attention to the production and life of employees, pay attention to the combination of work and rest, adjust the schedule of work and rest, strictly control overtime, pay close attention to the physical examination of workers working at high temperature and high altitude before entering summer, and make appropriate changes to those who are not suitable for high temperature and high altitude.

Pay attention to prevent infectious diseases and ensure food hygiene.

Pay attention to prevent the occurrence of fire.

Guarantee measures for steel bar construction in summer

1, reinforced materials from the steel processing plant to the construction site, should pay attention to safety in the process of transportation, reinforced in the process of transportation to bind firmly, to prevent the phenomenon of steel bar falling in the process of transportation, especially when the steel bar is too long, vehicles should add safety warning signs, vehicles should be extra careful when turning and going up and down the slope.

2. After the acceptance of semi-finished steel bars, they should be placed in specific places, not on slopes or in safe passages. Steel bars should be placed in an open place, which is convenient for construction and does not affect traffic.

3. During the summer construction, waterproof and rust-proof measures should be taken at the steel processing plant and semi-finished product stacking place on the construction site. It is forbidden to pile up steel bars at will, and transportation and stacking should be arranged in a unified way. For the arrival of the flood season, measures should be taken in advance to clean up the sundries and water in the steel bar stacking area in time. When steel bars are stacked, wood should be placed above the bottom pad to prevent water from rusting the steel bars. In rainy days, steel bars should be covered with geomembrane, and geomembrane should be replaced in time. It is forbidden to pile the steel bars on the excavated plain soil, which will easily make the square wood fall into the soil, make the steel bars directly contact with the soil, and cause the steel bars to rust.

4. Due to the high outdoor temperature in summer construction, the steel bars are exposed to the scorching sun, and the surface temperature is too high. Steel bar workers are forbidden to touch steel bars directly with their bare hands when handling steel bars, so as not to cause burns; The geomembrane covered on the steel bar can also play a role in sun protection.

5, steel workers in steel binding, to do a good job in protective measures, especially in the main external wall steel binding, due to the narrow construction surface, construction should pay more attention to safety.

Guarantee measures of formwork construction in summer

1. When construction templates are stacked in summer, fire-fighting equipment should be placed in the site to avoid fire caused by dry temperature.

2. When materials are piled up in a centralized way, personnel shall be arranged to carry out special inspection, and there shall be no open fire at the site.

3, construction template, beam, wall template must have a cleaning mouth or outlet, template release agent should be covered with plastic sheets after brushing in rainy days, in case the isolation layer is washed away by rain.

4. When the steel pipe rack and other materials are supported on the backfill soil, the sleepers should be padded. After the rain, the firmness, stability and section size of the formwork and support should be checked in time.

5. Wooden formwork used in rainy days should be dismantled and leveled to avoid deformation and cleaned up in time. Brush the release agent again after the heavy rain.

6. Assemble the formwork as soon as possible after concrete pouring to prevent the formwork from being deformed in the sun and rain. If the formwork cannot be poured in time after assembly and gets wet by rain, recheck it before pouring concrete to reinforce the formwork and support.

7. Formwork and components: The stacking area should be hardened and firmly inserted. Before pouring concrete in rainy days, carefully check the formwork and support to prevent the formwork support from loosening.

8, big template when landing, the ground should be solid, and support firmly.

9. Formwork used in the main structure shall be hoisted to the designated yard in time after the timber is dismantled to prevent the formwork and timber from being exposed to the sun and rain.

Guarantee measures for concrete construction in four summers

1, mix proportion adjustment

According to the construction environment, reasonably adjust the summer construction mixture ratio. Slump loss should be fully considered when adjusting the mixture ratio. In order to reduce the slump loss of concrete and avoid the concentration of hydration heat, we can adjust the raw materials to choose cement with low hydration heat, and delay the setting time of concrete by adjusting the content of compound admixture to meet the construction requirements.

2, concrete mixing and transportation

Effective measures should be taken to control the mixing temperature of concrete in hot season. By mixing with low-temperature water and washing aggregate with cold water, measures are taken to control the temperature of cement entering the machine and reduce the mixing temperature of concrete.

3, concrete pouring

When pouring concrete in hot climate, the time should be adjusted and the construction work surface should be arranged reasonably. The concrete construction should be carried out at night or in the morning when the ambient temperature is low, avoiding the high temperature time at noon or afternoon. Equipped with sufficient manpower, equipment and machinery to cope with the unfavorable situation that concrete is nowhere to be used, and control the temperature difference between the concrete surface and the outside world and the temperature difference between the concrete interior and the surface at any time.

4. Maintenance of concrete

If the concrete poured in summer is not properly maintained, it will reduce the strength of concrete or cause plastic shrinkage cracks on the surface. Therefore, it is necessary to strengthen the maintenance of concrete.

5, concrete quality requirements

(1) concrete curing should be timely. 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, it can be covered with non-absorbent materials such as plastic film at the same time of pouring, and then formally enter the maintenance process after the initial set gypsum is collected.

(2) If artificial watering and spraying are used for curing, the concrete surface can be covered (wrapped) tightly with absorbent materials such as geotextile, sacks and cotton felt, and the interval between watering and spraying is short. Keep the inside and outside of the hood moist from beginning to end to prevent dry-wet cycle. Generally speaking, the curing water temperature should not be lower than 15℃, and the difference between curing water temperature and concrete surface temperature should not be higher than 15℃, so as to prevent cracks on concrete surface.

(3) If the concrete surface is covered with plastic film for moisture curing, the plastic film should have certain crack resistance, tensile strength and flexibility. After the concrete is demoulded, water should be sprayed on the concrete surface first, and it should be wrapped immediately. Plastic film should be close to the concrete surface to avoid leakage and air tightness. During the curing period, water droplets will appear on the concrete surface from beginning to end. In order to keep the concrete surface moist, water can be sprayed into the plastic film regularly, and the integrity of the film should be checked frequently. If the plastic film is found to be broken, it should be repaired in time.

(4) According to different meteorological temperature conditions and different structural characteristics, the curing period of high performance concrete should generally be controlled at 14 ~ 28 days. During this curing period, heat preservation and curing measures should be taken to ensure that the curing humidity of concrete meets the requirements and the hydration of concrete can proceed smoothly.

(5) A special person shall be responsible for the maintenance of high performance concrete, and a special system shall be established. During the maintenance period, it is necessary to patrol and inspect in time, find problems, solve them in time, pay attention to details, make records and fully implement maintenance measures.

suffer sunstroke

(1) Strengthen heatstroke prevention and cooling education.

The heatstroke prevention and cooling team should regularly carry out heatstroke prevention and cooling safety education and publicity work for each operation team, so that everyone can master the common sense of heatstroke prevention and cooling safety and improve the adaptability and processing ability of the operators in the operation. Everyone knows the precautions in summer construction and how to protect themselves. Save others. Post the common sense of summer vacation in front of the site office, and publish the daily temperature on the site blackboard, so that the construction personnel can know the temperature of the day in time.

(2) Precautions for heatstroke prevention and cooling

1, earnestly implement the management regulations of the construction site, actively take measures to strengthen the ventilation and cooling of the construction site, ensure the sufficient supply of tea at the site, and organize timely treatment in case of heatstroke.

2, do a good job of health and epidemic prevention in the construction site, strengthen the hygiene management of drinking water and food, strictly implement the food hygiene system, and avoid poisoning incidents caused by food deterioration;

3. Strengthen the monitoring of summer-prone diseases. In case of legal infectious diseases and food poisoning, the field staff should report to the project department in time and handle it properly in time.

The project department and subordinate offices of each work area should place heatstroke prevention drugs and rescue equipment to provide necessary protective articles and heatstroke prevention drugs for front-line workers who insist on construction under high temperature conditions. Drugs and rescue equipment are as follows:

① Drugs: therapeutic drugs such as cold medicine, fever medicine, diarrhea medicine and anti-inflammatory medicine, as well as health-care drugs such as essential balm and Huoxiang Zhengqi water.

(3) Rescue appliances: receiver, towel, medicine cabinet, etc.

(3) Specific measures for heatstroke prevention and cooling construction

1, arrange the work and rest time reasonably. Pay close attention to the weather forecast of high temperature weather. Meteorology defines the daily maximum temperature greater than 35 degrees Celsius as "high temperature day", and the "high temperature day" with more than 5 consecutive days is called "continuous high temperature". Strictly implement the measures of "grasping at both ends and intermittently" to avoid high temperature, appropriately adjust the labor rest system for high temperature operation in summer, reduce labor intensity, strictly control outdoor operation time, avoid operation during high temperature period, and ensure the health and life safety of workers. Outdoor work is prohibited during the maximum temperature period11:00 ~14: 00 every day.

2. Strengthen the rotation rest at work. In summer, according to the construction progress, adjust the labor organization, adopt frequent shift work, shorten the continuous operation time, and strengthen the rotation work at work. Strengthen on-site inspections, increase the publicity of heatstroke prevention and cooling knowledge, and improve the safety awareness of all staff.

3. Ensure that there is enough drinking water supply at the site. Sufficient drinking water meeting the hygienic requirements should be supplied at the site to effectively prevent heatstroke and avoid heatstroke.

4. Adjust diet, pay attention to nutrition, prepare more foods with high vitamin content such as vegetables and fruits, cook more mung bean soup, and cook porridge with lotus seeds, mint, lotus leaves, japonica rice and rock sugar, which is not only sweet and refreshing, but also a good medicine for clearing heat and relieving summer heat, which can effectively prevent heatstroke and cool down.

5. Construction personnel are required to carry heatstroke prevention drugs with them, such as Ren Dan, cooling oil, essential oil, Huoxiang Zhengqi water and tea.

6. Improve the production and living environment of the construction site. We should conscientiously implement the Regulations on the Management of Construction Sites, strengthen ventilation and cooling, and ensure that temporary facilities such as dormitory, canteen, toilet and shower room for construction workers can meet the needs of heatstroke prevention and cooling. Electric fans shall be installed in the dormitory and canteen on the construction site, and air conditioning shall be installed in the dormitory where conditions permit.

7, the transformer room, warehouse, paint room and other flammable places for regular inspection, found that the problem immediately, at the same time equipped with fire fighting equipment.

8. Before construction, it is necessary to formulate preventive measures for dangerous operations that are prone to heatstroke accidents, and conduct detailed safety technology education step by step.

9. Install current limiting protection devices and leakage protection devices with corresponding power in dormitories and living quarters.

10. The project department shall designate a special person to be responsible for the provision of heatstroke prevention and cooling supplies, and set up multiple heatstroke prevention and cooling points at the wellhead, in the tunnel and on the trolley respectively.

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12, heatstroke prevention and cooling should be implemented in every work area, every team and every working face. Anyone who fails to meet this requirement should seriously urge the rectification, and severely punish the work area that refuses to rectify or the rectification is not in place. If the work is stopped, it will be resolutely punished. During the high temperature period, our project department will conduct special inspections on the heatstroke prevention and cooling work in each work area. For those who do not seriously implement the requirements of heatstroke prevention and cooling, in addition to the informed criticism of the project department, the relevant responsible work areas and individuals will be seriously investigated.

(4) Rescue methods for heatstroke patients

1, mild patient rescue

When the field operators feel dizzy, weak and dizzy, they should stop the operation immediately to prevent secondary accidents. Other peripheral operators should arrange symptomatic personnel to rest in a cool and ventilated place and provide them with cold water and wet towels. Only those with premonitory symptoms or mild symptoms can be given cold and salty drinks, oral Ren Dan and ten drops of water. And notify the heatstroke prevention and cooling team to arrange medical rescue personnel for observation, diagnosis and treatment.

2. The rescue of critically ill patients

When heatstroke occurs at the job site (accompanied by fainting, shock, severe water shortage, etc.). ), the personnel around the operation shall immediately notify the leading group for heatstroke prevention and cooling of the project department, and timely transfer the accident personnel to a cool and ventilated place (or air-conditioned room) to observe their symptoms, so that the medical staff can grasp the first-hand medical information when they arrive. The leading group for heatstroke prevention and cooling should immediately organize ambulance personnel to the scene to treat the accident personnel according to the specific situation. Those with severe symptoms should be transferred to the nearest hospital for observation and treatment as soon as possible and reported to the company if the medical equipment of the project department cannot be treated.

▎ This article comes from construction supervision. Please contact us in time if copyright issues are involved.