Technical measures to strengthen construction safety in rainy season?
Construction in summer is affected by many unfavorable environmental factors such as rain, strong wind and high temperature, which directly endangers production safety and brings immeasurable losses to enterprises. Therefore, it is of great significance to organize the construction scientifically and reasonably, take necessary safety technical measures, actively deal with all kinds of dangers faced by the rainy season construction, improve the ability to resist risks and ensure the production safety of enterprises.
1 General requirements for construction in rainy season
1) Due to the uncertainty and suddenness of severe weather such as construction storm in summer, it is difficult to predict the degree of D correction of construction shadow, so it is necessary to strengthen the understanding of meteorological information, take effective safety measures in time and strengthen prevention.
2) Prepare the construction organization, fully consider the characteristics of rainy season construction, reasonably arrange indoor and outdoor operations according to the weather conditions, do a good job of interweaving processes, improve efficiency and construction speed, and stop construction in case of heavy rain.
3) Make emergency preparations for flood control and disaster relief. Take effective measures to strengthen scaffolding, swing cranes, passenger and cargo elevators, warehouses, protective sheds, temporary facilities, etc. Ensure that emergency materials and personnel are in place, and start the emergency plan immediately in case of danger.
2 rainy season construction preparation measures.
1) Arrange the operation time reasonably. The operation time is compressed into two sections as far as possible to avoid the high temperature at noon. When the temperature exceeds 37℃, outdoor operation should be stopped, and ventilation and cooling measures should be taken during indoor operation. In case of rainstorm, all operations should be stopped.
2) According to the layout of the construction site, determine the drainage direction by using the natural terrain, and dig the drainage ditch according to the specified slope to ensure smooth drainage. Sufficient drainage equipment should be prepared and a reasonable drainage scheme should be formulated.
3) Protect raw materials, finished products and semi-finished products. Check the material warehouse regularly and maintain it in time. The surrounding drainage is good and the wall foundation is firm, ensuring the quality and safety of materials.
4) Set up continuous and smooth drainage facilities in strict accordance with flood control requirements, and prepare enough emergency materials, such as water pumps and related equipment, plastic sheets, linoleum and other materials.
3. Construction measures for key parts in rainy season
3. 1 Earthwork and Foundation Works
1) When excavating foundation trench (pit) or pipe trench in rainy season, attention should be paid to slope stability. If necessary, you can slow down the slope or set up supports. During construction, the inspection and control of slope and support should be strengthened: the excavated foundation trench (pit) or pipe trench should provide support.
2) Prevent the slope from getting wet by rain; In case of collapse, steel wire mesh can be nailed on the slope and reinforced with 50cm fine stone concrete; Plastic sheets can also be used to cover slopes.
3) The working face in the rain period should not be too large, and should be completed by stages. After the foundation is dug to the elevation, it shall be accepted in time and concrete cushion shall be poured; If the foundation is soaked by rain, it should be excavated and backfilled.
4) In order to prevent the foundation pit from flooding, drainage ditches and collecting wells should be well arranged in the foundation pit during excavation, and necessary drainage forces should be organized: in case of sudden rainstorm during basement construction, necessary measures should be taken.
5) After the foundation construction is completed, backfill should be carried out around the foundation pit. If the soil has been backfilled before it rains, the surface should be pressed into a certain slope to let the rain drain automatically.
3.2 Masonry engineering
The overall stability of masonry is mostly derived from the cohesive force and water content of masonry materials, both of which are
During the rain, the project will be greatly affected. Therefore, during this period, the construction should master the following points.
Key points:
1) wet masonry is not suitable for rainy season construction, so as to avoid mortar loss and affect masonry quality. Bricks must be piled in rainy season, which is not suitable for watering. When building a wall, it is required that dry and wet bricks should be reasonably matched, and the building height should not exceed1m.
2) In case of heavy rain, it is necessary to stop working and cover the top of the wall with a layer of dry bricks to prevent mortar from being washed away by heavy rain. The top two bricks should be turned over for the newly built wall washed by rain after heavy rain.
3) For the wall between the window with poor stability and the independent brick column, temporary support or ring beam should be added in time to increase the stability and stability of the wall.
4) During masonry construction, the internal and external walls should be built at the same time as far as possible, and the corner should be connected with the T-wall at the same time. After the rain, the quality of the wall should be checked in time, and remedial measures must be taken for the places where the rain has washed seriously.
33 immersed tube concrete project
1) should ensure the quality of cement and other materials, strengthen the determination of water content of sand and gravel, adjust water consumption in time, and strictly control the slump of concrete.
2) Before painting the template isolation layer, grasp the weather forecast in time to prevent the isolation layer from being washed away by rain.
3) In case of heavy rain, stop pouring concrete and cover the poured part. If continuous operation is required and construction joints are not allowed, rainproof measures should be taken.
4) Before large-scale concrete pouring, it is necessary to know the weather forecast for 2-3 days and try to avoid heavy rain. Sufficient rain-proof materials should be prepared at the pouring site to prevent sudden rain during pouring.
5) Formwork support must be firm, and the contact surface with soil foundation should be compacted and padded; After the formwork support is completed, strict inspection shall be carried out to remove sundries and dirt in the desert slab.
6) Outdoor rebar welding shall not be carried out in rainy days, and it shall be carried out indoors when it is urgently needed: the newly welded rebar joint shall be rain-proof to avoid brittle fracture when the joint is quenched.
3.4 Roofing project.
1) Roof works shall be constructed before the rainy season as far as possible, and roof downpipes shall be installed at the same time.
2) Coils, thermal insulation materials, etc. It should be covered and protected from the rain.
3.5 Plastering project
1) Outdoor plastering is not allowed in rainy days, and at least the weather change of 1-2D should be predicted. For pile walls, attention should be paid to prevent rainwater pollution.
2) Indoor plastering shall be carried out after the roofing is finished as far as possible, at least the roofing leveling layer shall be finished, and a layer of linoleum shall be laid.
3.6 scaffolding
1) Many scaffolding stands directly on the earth-rock foundation, and will sink, hang or overturn if it is soaked in heavy rain. Therefore, the bottom of the scaffold should be lengthened with pads, and sweeping poles should be set according to regulations.
2) Wall connecting pieces must be installed according to the requirements of JGJL30-200 1 specification to enhance the overall stability and overturning resistance of the pump frame.
3) Anti-skid and anti-falling measures should be taken for the passage on the scaffold, and protective fences should be installed on both sides of the passage.
4) Regularly check the fittings at the scaffold joint, and reinforce and restore them in time if they are loose or displaced.
3.7 Tower Crane, Material Elevator and Construction Elevator
1) Tower crane, material hoist and construction hoist are also the key control projects in rainy season construction, and their foundations should be higher than the ground as required, and they should be checked regularly for changes.
2) Install lightning protection device, and the grounding resistance value shall not be greater than10 o.
3) No signs shall be hung on all the fuselage to prevent excessive wind load and strengthen the attachment device.
4) Before stopping the operation, the crane hook should be raised to the top of the forearm root, and the material hoist and elevator should lower the hanging cage to the ground and cut off the power supply.
3.8 Safety measures for construction machinery.
1) All hungry machinery sheds should be firmly erected, and measures should be taken to prevent collapse, rain and water flooding: the machinery installation site is slightly higher, the surrounding drainage is good, and grounding devices should be installed; The leakage protection device of mobile switch box should be reliable and sensitive.
2) Steel scaffolding, tower cranes, material hoists, people and goods elevators, etc. shall be equipped with effective lightning protection devices. Lightning protection grounding resistance should not be greater than10Ω.
3) The power consumption on the construction site must conform to the three-level distribution bipolar protection. The third-level electrical box is repeatedly grounded, and the resistance is less than 100: wires and cables are properly buried, and aging or damage is not allowed; All employees must disconnect the power supply of all equipment and tools before leaving work.
4 to do a good job of on-site fire safety.
1) Strengthen the protection of warehouses and woodworking areas, especially the management of fire sources.
2) Strengthen the construction electricity inspection to prevent short circuit accidents; Reasonable arrangement of construction cables, flammable items shall not be close to the cables.
3) Strengthen the management of flammable items and store them specially. Oxygen, acetylene, etc. For lightning protection and sun protection, it is forbidden to store in the open air.
5. Food safety and health care measures at the construction site
1) The staff dormitory should meet the requirements of relevant regulations, be ventilated and dry, and take measures to prevent flies, mosquitoes and rats to keep the surrounding environment clean and tidy.
2) Take cooling measures, prepare medicines and food for heatstroke prevention, and do a good job in cooling and heatstroke prevention.
3) Do a good job in canteen management, improve canteen conditions, maintain good ventilation, disinfect regularly, ensure that all foods and vegetables are fresh and eat on the day of purchase, and open the refrigerator to refrigerate meat: take measures to prevent rats, flies and mosquitoes; Ensure the food safety of employees and avoid poisoning incidents.
4) Set up an infirmary on the construction site, equipped with some commonly used drugs and some instruments, to provide medical care for daily workers and rescue them in time in case of accidents.
6 safety inspection
1) Managers at all levels should strengthen safety inspection and deal with problems in time. Regularly check the main building, scaffolding, construction electricity, tower crane, material lifting willow, formwork support system, small mechanical awning, temporary facilities and safety signs to eliminate problems in time.
2) In case of storm, outdoor operation should be stopped immediately, personnel should be evacuated to a safe place quickly, and power supply should be cut off decisively: outdoor operation should be stopped in weather above Grade 3.
3) Strengthen the training and education of all kinds of personnel, strengthen the study of common sense of safety construction in summer, and improve self-prevention ability and emergency response ability.
The above are collected and sorted by Zhong Da Consulting Company.
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