What are the main precautions for construction in the rainy season?

The first is the establishment of a rainy season flood control leading group, which is also responsible for establishing flood control plans and various emergency plans and measures. At the same time, the project department must set up full-time on-duty personnel to ensure that there are people on duty day and night and have a thorough understanding of the weather conditions. At the same time, the rainy season construction training for construction personnel must also be carried out, and a comprehensive inspection of the preparations for the construction site must be carried out. Finally, in addition to the construction site, the drainage facilities of the production and living bases must also be inspected, and the drainage and various garbage should be cleaned at any time, so that rainwater can be drained smoothly. Specific protective measures 1. Office area drainage 1. Check whether there are any leaks on the roofs of offices, dormitories and warehouses, and repair the leaking parts in a timely manner. 2. The outdoor ground should be fully hardened, the drainage slopes of roads and venues should be correct, and drainage ditches should be unobstructed to ensure that there is no accumulation of water at the construction site. 2. Construction site drainage 1. Before the rainy season, focus on checking the underground floors of the key prevention parts of the project, and set up 300 × 500 (b × h) drainage ditches along the ground around the main body. When it rains, a water pump will be equipped to drain the sump, and the water will be discharged. Drain into a drain on the ground. 2. Organize the construction site to ensure smooth drainage. 3. Check the drainage facilities inside and outside the site to ensure that the drainage equipment is in good condition to ensure that accumulated water can be discharged in a short time after heavy rain. According to the actual situation, the nearest water collection well at the construction site should be used as the on-site drainage concentration point. 3. Living area 1. Before the rainy season, project logistics personnel should inspect the temporary houses in the living area. The inspection content mainly includes: whether there are hidden dangers such as leakage, stability, lightning strikes, etc. If any problems are found, they should be rectified in a timely manner. 2. Check the drainage ditches in canteens, toilets, etc., and clear sewage pipes in time. Septic tanks should be cleaned before heavy rains come to prevent them from overflowing due to heavy rains. 3. The foundations of personnel dormitories and fences at the construction site should be more than 300mm higher than the natural ground, and should be made of lime sand bricks to ensure the safety of this part of the structure. The indoor floor should be at least 100mm higher than the outdoor floor to prevent rainwater from infiltrating. 4. Storage and stacking of raw materials and semi-finished products 1. When stacking steel bars at the construction site, they should be placed on higher ground and protected from rain erosion. At the same time, the lower part of the steel bars should be padded with wood and other materials to a height of not less than 200mm. For processed steel bars, they should be placed in a rain-proof place in the steel bar processing shed as much as possible to prevent the steel bars from being corroded by rainwater and becoming embroidered. 2. A warehouse should be built for cement, and the warehouse should be rain-proof and the ground should be moisture-proof to prevent moisture. Other materials should be stacked accordingly according to their properties. 3. All materials are required to be piled in a safe place no less than 3m outside the slope of the foundation pit. Materials that are easily scattered should not be piled next to the slope. 5. Earthwork works 1. The lime soil that has just been paved but not yet compacted should be strictly controlled during the backfill construction during rainy season. Samples should be taken and tested in a timely manner to control the moisture content of the backfill within the design requirements. If the moisture content is too high, Measures such as plowing, drying or evenly mixing in dry soil can be used; if necessary, the soil source should be covered in advance to avoid rubber soil. 2. If it is soaked by rain, the soft soil in the water accumulation area should be removed and refilled with new soil and compacted. The soaked soil should be dried and then compacted. Lime and soil should be prepared with plastic film to cover them when it rains. 6. Slope Engineering 1. It is prohibited to pile materials within one meter of the slope during construction during rainy periods. 2. Before construction during rainy periods, check whether there are any deviations or cracks on the slope, and use cement mortar to find slope-side drainage ditches to keep no water around the slope. 3. Keep records of slope settlement and measure at any time when encountering heavy rain or above. 7. Steel bar project 1. Steel bars should be brought into the site in an appropriate amount according to the progress of the project. The raw materials of steel bars should not be stored in excess. The raw materials on site should be used first and those that enter the site last to avoid corrosion of the steel bars caused by long storage time. Serious, corroded and contaminated steel bars must be cleaned before use. Raw steel bars and finished steel bars entering the site must be neatly stacked according to specifications and placed at least 200mm above the ground. They should be temporarily covered with plastic sheets when it rains. 2. Welding work is strictly prohibited during thunderstorms. If welding occurs under special circumstances, necessary rainproof measures must be taken to prevent rainwater from soaking the welded joints and causing changes in the connection performance of the steel bars, thereby affecting the quality of the project. 3. If the tied steel bars encounter rainy days, the steel bars will be rusted and decontaminated according to the situation after the rain. Corroded and sludge-covered steel bars shall not be used in the project. 8. Formwork project 1. The formwork and wood stacked on site should be stacked neatly, padded more than 200mm off the ground, and covered with tarpaulin to avoid deformation caused by sun and rain. 2. If the erected wall formwork is not poured with concrete due to heavy rain, it should be covered to prevent the release agent from failing due to rain. After the rain, the flatness, verticality and adhesion of the release agent should be carefully checked. Concrete can be poured only after it is qualified. 9. Concrete projects should accurately grasp the weather forecast, and try to avoid rainy days when pouring concrete. In case of heavy rain, the following measures should be taken: 1. When heavy rain occurs during concrete pouring, the poured concrete should be vibrated compactly and placed in the appropriate position according to the specifications. Stop pouring immediately after leaving the construction joints in time, cover them with plastic sheets, and tie the plastic sheets and steel bars firmly to prevent them from being blown away by the wind. If there is light rain during the pouring of the roof concrete, vibrate, press and cover it in time to ensure that the cement slurry is not lost. 2. After the rain, the temporary construction joints should be strengthened to remove the remaining slurry and weak points. The dirt and accumulated water in the beams, slabs, and walls should be cleaned up and the concrete can be poured only after acceptance.

3. In order to ensure the quality of concrete, during construction during rainy periods, concrete mixing manufacturers are required to promptly adjust the water consumption of concrete according to the actual moisture content of sand and stone to ensure the quality of concrete. And regularly send people to the mixing station to check its sand and stone stockyards and cement warehouses to check the mud content of the sand and stone and the rainproof condition of the cement. It is strictly prohibited to use sand, stone and failed cement with excessive mud content in the project. 10. Masonry and plastering projects 1. Before masonry construction during the rainy season, the moisture content of various bricks or blocks should be tested. Do not put dry bricks on the wall, but also prevent excessive water absorption. To prevent the building blocks from getting too wet or soaked by rainwater, cover the building blocks (bricks) with plastic sheets when it rains. Blocks (bricks) with a high water content should be properly dried before use. Construction should be stopped in the event of moderate or heavy rain, and rainproof measures should be taken on the masonry surface. 2. If slurry flows along the wall during masonry, it means that the water content of the building blocks (bricks) has reached saturation. Dry bricks and wet bricks should be used for masonry, or mortar with a smaller consistency should be used. 3. Cement should be stored in a warehouse. The floor inside the warehouse should be built with a brick ridge wall 300mm higher than the outdoor ground. Scaffolding boards should be laid on the wall and linoleum should be laid on the wall to prevent the cement from getting damp. Effective maintenance must be carried out around the cement reservoir, and drainage ditches must be dug to prevent rainwater from flowing into the reservoir. 4. The sand and gravel yard must have good drainage measures to prevent soil from flowing into the sand yard when it rains. 5. Mortar mixing should be centralized, the mixing station should be erected with a rainproof shed, and the vehicle transporting the mortar should be equipped with a rainproof cover to prevent rainwater from entering the mortar. 6. The project tester will regularly measure the moisture content of sand and stone based on weather conditions. It is required to measure the moisture content of sand and stone before construction, adjust the mix ratio in a timely manner, and strictly control the mortar consistency. 7. When it rains, open-air masonry work is prohibited. When masonry must be laid in sporadic light rain, the mortar consistency should be appropriately reduced. 11. Roofing Project 1. When the roofing project is constructed in the rainy season, pay close attention to the recent local weather forecast and work on sunny days. It is strictly forbidden to carry out waterproofing construction in the rain. Cover the constructed parts with plastic sheets; if the waterproof layer is found to be damaged by rainwater after rain, it should be reworked. 2. During the transportation and storage of roof insulation materials, it is strictly prohibited to be exposed to rain and protected from moisture. 3. When laying the insulation layer on the roof, it should be divided into small construction sections, and the upper leveling layer should be prepared in time to prevent sudden rainfall from getting wet and soaking the insulation layer. 4. Detailed nodes such as holes passing through the insulation layer and leveling layer, as well as reserved anchor hooks, should be temporarily closed and covered at any time to prevent rainwater from intruding. 5. When laying the waterproof layer, the moisture content of the leveling layer and the bonding test should be carefully tested according to the technical requirements of the materials used before construction. Construction can only be carried out after meeting the technical requirements to ensure the quality of the waterproof layer. 6. Rainwater downpipes should be installed as soon as possible to prevent roof rainwater from washing along the exterior wall and contaminating the exterior decoration. Before installing rainwater pipes for internal drainage, temporary drainage roads should be prepared to prevent rainwater from being accumulated in the pipes because it cannot be drained smoothly. 12. Waterproofing Project 1. Construction of exterior wall waterproofing projects is prohibited on rainy days, and the moisture content of the waterproofing base layer must be within the range required by the specification (≤4%). 2. During the construction of cushion concrete, the drainage slope should be prepared as required, and a puddle should be set up next to the pit to pump out water in a timely manner. 3. Ventilation and exhaust measures should be taken for waterproofing construction in poorly ventilated areas such as bathrooms and fire pump rooms to ensure air circulation, personal protection, and fire prevention and fire protection. 4. When constructing exterior wall waterproofing, close attention should be paid to the stability of the slope soil. The displacement of the slope should be checked after each rain. Construction should be stopped when the displacement is large. 13. Decoration Project 1. It is best to do indoor decoration after the roof and floor projects are completed, or to do the ground first and seal all kinds of holes and board seams to prevent the upper floor from leaking downwards. Seal the window wells and elevator wells, and build water barriers in the stairwells on each floor. 2. Outdoor plastering should be covered in time to prevent sudden rainfall from washing away. Exterior wall decoration work is strictly prohibited during rainfall. 3. Installed doors and windows should be managed by someone, and should be closed and bolted in time when it rains to prevent wind and rain damage. 4. Various doors, windows, joinery, and other types of keels and decorative materials, glass, accessories, etc. must be strictly prohibited from rain and moisture during transportation and storage to prevent bonding, deformation, or rust. 5. Gypsum strips, paper-faced gypsum boards, gypsum-clad composite boards and other quality partition wall materials are strictly prohibited from rain, water immersion and moisture to prevent material degeneration and quality hazards. 6. Exterior wall coating construction should be organized on sunny days. 14. Curtain wall engineering 1. Curtain wall construction should not be carried out in strong winds and heavy rains. Sealant construction should not be carried out on rainy days or when it is not dry after rain. 2. Electrical equipment and power tools used in curtain wall projects must undergo insulation voltage tests. And check whether the insulation device is intact before construction during rainy season. If it does not meet the requirements, it must be rectified in time. 3. The aluminum panels and aluminum-plastic panels that go upstairs must be firmly fixed to prevent them from being blown down by strong winds and injuring people. 15. Power supply safety 1. During the rainy season, regular personnel should check the insulation status of power supply facilities, check whether the power cord is damaged, and deal with any problems in a timely manner. 2. The temporary power supply line on site adopts three-phase five-wire wiring system, and the electromechanical equipment gate box, lamps and lanterns are equipped with rain-proof facilities. All electromechanical equipment must be equipped with a single switch. It is strictly prohibited to use one gate for multiple purposes, and a leakage protector should be installed. During shutdown, the power should be turned off and the gate box should be locked. It should be inspected and tested before use. 3. A qualified leakage protection device must be installed in the distribution box, check the sensitivity of the leakage protection device promptly, and close the electrical box door at all times. 4. Personnel engaged in electrical work must hold a certificate and wear labor protection equipment. Two people should work at the same time, one person working and one person supervising.

16. Tower crane foundation and hoisting 1. The tower crane should be inspected in time for line inspection and roadbed inspection after rainy days, and should be operated without a truck. Only after confirming that there are no problems can it be officially hoisted. 2. Observe the subsidence of the foundation and make observation records. If there is subsidence, deal with it immediately to ensure the safety of the tower crane when using it. Hoisting operations should be stopped during heavy rain, torrential rain and strong winds. 3. High-altitude operators should pay attention to non-slip when working after rain, and wear rubber-soled shoes. Hard-soled shoes are not allowed to be worn for high-altitude operations. The grounding resistance of the tower crane must be measured and the resistance value should not be greater than 4 ohms. 4. Dig a 200mm×300mm drainage ditch around the tower crane foundation to connect it to the on-site temporary drainage ditch. The inside is plastered, and a 5‰ running water slope is set at the bottom of the ditch toward the temporary drainage ditch. 5. Four settlement observation points are set up on the base of the tower. Settlement observations are conducted regularly and after rain, and problems are dealt with in a timely manner. 17. Scaffolding Project 1. Check that the outer frame, especially the outer frame at high places, has been designed and installed with a relatively complete lightning protection device. 2. Anti-skid in rainy season. Necessary anti-skid facilities should be installed on working surfaces, horse trails and other places where people pass. 3. Set up a drainage ditch away from the outer pole of the scaffolding to drain away rainwater in a timely manner to prevent the scaffolding foundation from being soaked by rainwater and causing foundation subsidence. Designate a dedicated person to check whether the pole pads are effective and whether they have collapsed before the rain; whether the foundation has subsided, whether the poles have sunk, and whether the scaffolding has deformed after the rain. If there are any abnormalities, they must be reinforced and repaired quickly. 4. During heavy rain, scaffolding is not allowed to be erected or dismantled; scaffolding should be inspected and repaired promptly after heavy rain or strong winds, and any potential safety hazards must be rectified before it can be put into use. 5. The foundation of the scaffolding should be solid, and long skids or blocks should be installed under the vertical poles. 6. The special passage set up on the outer frame for backfill construction must be dismantled and erected in strict accordance with the structural requirements for door openings in JGJ130-2011 Safety Technical Specifications for Fastener Steel Pipe Scaffolding in Construction, and must be inspected and accepted by the on-site safety officer. Can only be used after passing. 18. Road Engineering 1. Improve the drainage system of the construction site to prevent rainwater from soaking the roadbed for a long time. When it rains, a special person should be assigned to patrol, and if any accumulated water or blockage is found, the water should be cleared and released in a timely manner. Dig a horizontal drainage ditch every 5-10m on both sides of the road shoulder to drain rainwater to the side ditch. 2. Concentrate efforts, shorten road sections, speed up construction progress, and avoid comprehensive expansion. When constructing lime gravel, attention should be paid to weather changes to ensure that the paving and rolling processes are completed before it rains to prevent the finished lime gravel from being flooded by rain without being rolled, making it impossible to continue. construction. 3. Take necessary rainproof measures according to local conditions. The compacted lime gravel layer has a certain effect on rainproofing. Therefore, when the roadbed is restored, the gravel layer should be completed as soon as possible. After the lime gravel arrives at the site, there is a sudden rainfall and there is no time to pave and compact it. It can be temporarily piled into a large pile, and the surface can be patted down, or covered with tarpaulin. 19. Greening Project 1. If it rains during the construction of greening soil and salt discharge coating, stop the work immediately and wait until the water content reaches the required level before starting construction to prevent the greening soil from being crushed into mud by machinery. 2. When constructing trees and turf, be careful not to be washed away by rain before planting to prevent the native soil from being washed away by water, resulting in a low plant survival rate. 3. Fertilize the soil to avoid rainy weather. 20. Equipment installation project 1. For the protection of raw materials and semi-finished products, those that can enter the warehouse or floors must be placed high and well ventilated. In particular, the insulation materials entering the site are strictly prohibited from being exposed to rain and soaking, and must be protected from rain in a timely manner. measure. Mechanical and electrical warehouses should have measures to prevent water intrusion. It is advisable to install exhaust fans in warehouses where electrical materials or other materials and equipment that need to be moisture-proof are installed to maintain ventilation in the warehouse. 2. Materials stacked in the open air, such as pipes or equipment, should be elevated and covered with plastic sheets when it rains. 3. Rainproof measures must be taken for the electromechanical equipment entering the site after unpacking, and storage in the open air should be minimized. 4. Rainproof measures should be taken for the holes reserved for equipment. If the equipment in the underground part of the construction site has been installed, measures should be taken to prevent the equipment from getting damp and being soaked by rainwater. 5. Mechanical and electrical processing equipment such as shears and threading machines should have rainproof facilities. 6. Outdoor welding operations should not be performed on rainy days; attention should be paid to the dryness of the working area during indoor welding operations; welding rods should be dried before welding operations in rainy seasons; effective ventilation measures should be taken when welding operations are performed in small spaces. 21. Lightning strike protection 1. In order to protect buildings, mechanical and electrical equipment, people, and livestock from lightning damage and injury, lightning rods, lightning protection belts, lightning arresters, down conductors and grounding electrode groups are generally installed for lightning protection. . 2. Temporary work sheds, construction work platforms, and dormitories at construction sites are required to take lightning protection and grounding protection measures according to actual conditions. Set up lightning rods, down conductors and ground level groups for lightning protection. 3. It is required that the lightning protection device must be well grounded. The grounding resistance of the grounding device must be regularly checked and measured. The grounding resistance of its independent grounding electrode should not be greater than 4 ohms. Otherwise, it should be dealt with in time. 4. Conduct regular inspections of lightning protection grounding devices and strengthen daily maintenance, focusing on checking whether the grounding wire is damaged, broken or corroded. 5. During the thunder and lightning season, observe thunder and lightning activities. In weather with thunder and lightning, construction workers should move indoors and no open-air, high-altitude or outdoor operations should be arranged. 6. When it is impossible to hide in a building with lightning protection facilities, stay away from trees and masts. 7. It is not advisable to hold an umbrella in an open space on site, or to carry steel pipes, shovels, etc. on your shoulders. 8. When thunder and lightning are frequent and lightning is strong, personnel are not allowed to go near lightning protection devices, such as lightning rods, lightning arresters, and down conductors. Do not take shelter under big trees, and do not touch antennas, water pipes, barbed wire, metal doors, windows, or buildings. Exterior walls should be kept away from wires and other electrical equipment or other similar metal devices to prevent accidents caused by lightning strikes.

9. Lightning protection measures for mechanical equipment. On-site construction equipment such as tower cranes should be grounded when installed. After the foundation of the construction project is formed, the tower crane must be properly connected to the foundation lightning protection grounding. The power supply PE line of the tower crane power supply system and the tower crane must be properly handled. The top and bottom of the external elevator guide rails are grounded respectively. Install an adapted surge protective device (SPD) in the distribution box.

For more information about engineering/service/purchasing tender document writing and production to improve the bid winning rate, you can click on the official website customer service at the bottom for free consultation: /#/?source=bdzd