The rainy season construction site protection skills are so practical!

The rainy season has come, and the rainy state has caused many difficulties to the construction. Therefore, it is of great significance to do a good job in construction safety prevention in rainy season. Today, the tender for bid protection collected and sorted out the super-practical skills of site protection in rainy season. Let's have a look.

0 1

Construction site drainage

1, before the rainy season comes, focus on checking the underground floor of the key prevention parts of the project, set up a 300mm×500mm open drain along the ground around the main body, and equip a water pump to drain the sump when it rains, and discharge the water into the ground drain.

2. Organize the construction site to ensure smooth drainage.

3. Check the drainage facilities inside and outside the site to ensure that the drainage facilities are in good condition and that the accumulated water can be discharged in a short time after the rainstorm. According to the actual situation, based on the principle that the collecting well on the construction site is nearby, it is regarded as the drainage concentration point on the site.

02

Storage and stacking of raw materials and semi-finished products

1. When steel bars are stacked on the construction site, they should be placed in a higher place and protected from rain. At the same time, the lower part of the steel bar should be padded with wood square and other materials not less than 200 mm For the processed steel bar, it should be placed in the shelter of rain in the steel bar processing shed as far as possible to prevent the steel bar from being corroded by rain.

2, build a warehouse, do a good job of warehouse rain and ground moisture, prevent be affected with damp. Other materials should be stacked according to their properties.

3. All materials shall be piled up in a safe place not less than 3m outside the foundation pit slope, and materials that are easy to scatter shall not be piled up beside the slope.

03

earthwork

1, the lime soil that has not been compacted has just been paved, and the water content of the backfill soil should be strictly controlled during the earthwork backfilling construction in the rain period, and the sampling test should be carried out in time to control the water content of the backfill soil within the design requirements. If the water content is high, measures such as scarifying, airing or evenly mixing dry soil can be adopted; When necessary, cover the soil source in advance to avoid rubber soil.

2. If it is soaked by rain, the soft lime soil in the water accumulation area should be removed and compacted with new lime soil. Soaked lime soil should be compacted after drying. Lime and soil should be covered with plastic film to prevent rain.

04

Slope engineering

1. It is forbidden to pile materials in the range of slope 1m during construction in rainy season.

2. Before the rain period construction, check whether there are deviations and cracks in the slope, and use cement mortar to find the slope to the drainage ditch to keep the slope from accumulating water.

3, completes the slope settlement records, met with heavy rain above the weather should be measured at any time.

05

Reinforcement engineering

1, rebar shall enter the site appropriately according to the progress of the project, and rebar raw materials shall not be stored too much. On-site raw materials should be used in the advanced site first, and then used after entering the site, so as to avoid serious corrosion of steel bars due to long storage time. Corroded and polluted steel bars should be cleaned before use. Raw materials and finished steel bars entering the site shall be neatly stacked according to the specifications, and shall be padded above 200mm from the ground, and temporarily covered with plastic sheets to prevent rain.

2. Welding is strictly prohibited in thunderstorm weather. When welding under special circumstances, necessary rainproof measures must be taken to prevent the rain from wetting the welded joints and affecting the engineering quality.

3. In case of rainy days, the steel bars after binding shall be properly derusted and decontaminated, and the corroded and slimy steel bars shall not be used in the project.

06

template

1, templates and squares piled up on site should be packed neatly, padded more than 200mm from the ground, and covered with tarpaulin to avoid sun and rain deformation.

2. In case of heavy rain, when concrete is not poured, the wall formwork that has been erected should be covered to prevent the release agent from failing due to rain. After the rain, carefully check its flatness, verticality and adhesion of release agent, and concrete can be poured only after it is qualified.

07

concrete work

1. In case of heavy rain during concrete pouring, the poured concrete shall be vibrated and compacted, and the pouring shall be stopped immediately after the construction joints are placed in the proper position according to the specification requirements, and covered with plastic sheets, which shall be firmly bound with steel bars to prevent being blown away by the wind. In case of light rain, the roof concrete should be vibrated, plastered and covered in time to ensure that the cement slurry does not run off.

2. Strengthen the treatment of temporary construction joints after the rain, remove cement slurry and weak points, clean up dirt and water in beams, plates and walls, and then continue pouring concrete.

3. In order to ensure the quality of concrete, in the rainy season, concrete mixing manufacturers are required to adjust the water consumption of concrete in time according to the actual moisture content of sand and gravel to ensure the quality of concrete. And regularly send people to the mixing station to check its sand yard and cement warehouse, and check the silt content of sand and the waterproof situation of cement. It is forbidden to use sand, stone and invalid cement with excessive silt content in the project.

08

Masonry plastering engineering

1 Before laying in rainy season, the moisture content of various bricks or blocks shall be tested. Don't dry bricks on the wall, and also prevent excessive water absorption. In order to prevent the block from being too wet or soaked by rain, the block (brick) should be covered with plastic sheets when it rains, and the block (brick) with more water content should be properly dried before use. In case of moderate and heavy rain, the construction should be stopped, and rain-proof measures should be taken for the masonry surface.

2, masonry, such as mortar flowing along the wall, that block (brick) moisture content is saturated, should choose dry brick and wet brick masonry, or use mortar with smaller consistency.

3. Cement should be stored in the warehouse. Inside the warehouse, a brick ridge wall 300mm higher than the outdoor ground should be built, and scaffolding and linoleum should be set on the wall to prevent cement from being affected with damp. Effective maintenance should be carried out around the cement silo, and drainage ditches should be dug to prevent rainwater from flowing into the warehouse.

4. The sand yard should have good drainage measures to prevent mud from flowing into the sand yard when it rains.

5, mortar mixing should be concentrated, the mixing station should build a fortification canopy, and the vehicles transporting mortar should be rainproof to prevent rainwater from entering the mortar.

6. According to the weather conditions, the project operators regularly measure the moisture content of sand and gravel, and require that the moisture content of sand and gravel be measured before construction, adjust the mixture ratio in time, and strictly control the consistency of mortar.

7, when it rains, it is forbidden to open masonry operations. When construction must be carried out in sporadic light rain, the consistency of mortar should be reduced appropriately.

09

Roofing engineering

1, roofing construction in the rainy season, should pay close attention to the local recent weather forecast, grab the construction in sunny days, it is forbidden to waterproof construction in the rain. Cover the constructed part with plastic sheets; After the rain, it is found that the waterproof layer is damaged by rain, so it should be reworked.

2, roof insulation materials in the process of transportation and storage, it is forbidden to rain and prevent be affected with damp.

3. When laying insulation layer on the roof, it should be divided into small construction sections, and the upper leveling layer should be made in time to prevent sudden rain from getting wet and soaking the insulation layer.

4, through the insulation layer, leveling layer holes and the reserved anchor hook and other details of the node, should be temporarily closed at any time, to prevent the rain from invading.

5. When pasting the waterproof layer, before construction, the moisture content test and bonding test of the leveling layer should be done carefully according to the technical requirements of the materials used, and the construction can only be carried out after meeting the technical requirements to ensure the pasting quality of the waterproof layer.

6. Rainwater pipes, etc. Should strive for early installation, in order to prevent the roof rain washed along the exterior wall, pollution of exterior wall decoration. Before the installation of rainwater pipes with internal drainage, temporary drainage roads should be made to prevent rainwater from accumulating in pipes with poor drainage.

10

water proofing work

1, exterior wall waterproofing works are prohibited from being constructed in rainy days, and the moisture content of waterproof base must be within the specification requirements (not more than 4%).

2, cushion concrete construction, completes the drainage slope as required, and set up a water pit at the edge of the pit, pumping in time.

3, toilet, fire pump room and other poorly ventilated parts of the waterproof construction ventilation and exhaust measures should be taken to ensure air circulation, personal protection, and do a good job of fire prevention.

4. During waterproof construction of external wall, we should pay close attention to the stability of slope soil, check the displacement of slope every time after rain, and stop construction when the displacement is large.

1 1

Decoration Engineering

1, interior decoration should be carried out after the completion of the roof and floor works, or the floor works should be carried out first, and all kinds of holes and joints should be blocked to prevent the upper floor from leaking downwards. And close the window wellhead and elevator wellhead, and make water retaining ridges on the stairwells of each floor.

2, outdoor plastering should pay attention to timely coverage, to prevent the sudden rain wash, it is forbidden to carry out exterior wall decoration work when it rains.

3, installed doors and windows, someone should be responsible for the management, when it rains, it should be closed in time and bolt, in order to prevent wind and rain damage.

4, all kinds of doors and windows and fine wood products and other keel and decorative materials, glass, accessories, etc. During transportation and storage, rain and moisture are strictly prohibited to prevent adhesion, deformation or rust.

5. High-quality partition materials such as gypsum board strips, gypsum boards and gypsum-coated composite boards are strictly prohibited from being exposed to rain, soaking and moisture, so as to prevent material deterioration from causing quality hazards.

6, exterior wall painting should be carried out in sunny days.

12

Curtain wall engineering

1, curtain wall construction should not be carried out in windy and rainy weather, and sealant construction should not be carried out in rainy days and after rain.

2, curtain wall engineering used in electrical equipment and power tools must do isolation voltage test. And check whether the thermal insulation device is in good condition before the rain period construction, and rectify it in time if it does not meet the requirements.

3. The aluminum plate and aluminum-plastic plate upstairs must be fixed firmly to prevent the strong wind from hurting people.

13

Emergency safety

1. In rainy season, it is necessary to check the insulation status of temporary power facilities regularly and by designated personnel, and check whether the power cord is damaged. When problems are found, they should be dealt with in time.

2. The temporary power supply line on site adopts three-phase five-wire wiring, and the switch box and lamps of mechanical and electrical equipment have rain-proof facilities. All mechanical and electrical equipment must be equipped with a single switch, and it is forbidden to use one switch for multiple purposes, and a leakage protector should be installed. When the machine is stopped, the switch box should be locked and inspected and tested before use.

3. Qualified leakage protection devices must be installed in the distribution box. Check the sensitivity of the leakage protection devices in time and close the door of the electric box at any time.

4, engaged in electrical operations personnel must hold relevant certificates, wear labor protection articles, and should be two people at the same time, one homework, one care.

14

Tower crane foundation and hoisting

1, tower crane should be timely line inspection and subgrade inspection after rainy days, and idle running, to ensure that there is no problem before formal hoisting.

2, observe the foundation settlement, and make observation records, if there is any settlement should be dealt with immediately, to ensure the safety of tower crane when using. In case of heavy rain, rainstorm and strong wind, the hoisting operation should be stopped.

3. Aerial work personnel should pay attention to anti-skid and wear rubber-soled shoes. Hard-soled shoes are not allowed to work at high altitude. The grounding resistance value of tower crane shall be measured, and the resistance value shall not be greater than 4Ω.

4. Dig 200mm×300mm drainage ditch around the tower crane foundation to connect with the site temporary drainage ditch, plaster the inside, and set a running water slope of 5‰ in the direction of the temporary drainage ditch at the bottom of the ditch.

5. Set four settlement observation points on the tower foundation, and conduct settlement observation regularly and after the rain, and handle the problems in time when found.

15

Scaffolding engineering

1. Check whether the outer frame, especially the high outer frame, is designed and installed with a relatively perfect lightning protection device.

2. Anti-skid in rainy season. Necessary anti-skid facilities shall be set at the working face, walkway and other places where people pass. ....

3. Drain the rainwater in time at the drainage ditch 1 on the outside of the scaffold upright post to avoid the foundation settlement caused by the scaffold foundation being soaked by rain. Before it rains, designated persons shall check whether the vertical pole stow-wood is effective and whether it collapses; Whether the foundation sinks after the rain, whether the vertical pole sinks and whether the scaffold is deformed, if there is any abnormality, it must be reinforced and trimmed quickly.

4, during the heavy rain, scaffolding shall not be erected and dismantled; After heavy rain and strong wind, the scaffold should be inspected and maintained in time, and it can only be put into use after the rectification of potential safety hazards is qualified.

5, scaffolding foundation should be strong, should be set up under the stud tong long stow-wood or block.

6. The special channel for backfill construction erected on the outer frame must be dismantled and erected in strict accordance with the structural requirements of the hole in the relevant specifications, and can only be used after it is accepted by the on-site safety officer.

16

road engineering

1, do a good job in the drainage system of the construction site to prevent the subgrade from being soaked by rain for a long time. Assign special personnel to patrol when it rains, and dredge the drainage in time when water or blockage is found. The horizontal drainage ditch shall be dug every 5~ 10m on the shoulders on both sides to drain the rainwater to the side ditch.

2. Concentrate on shortening the road section, speeding up the construction progress, and avoiding all-round spreading. During the construction of lime-fly ash macadam, attention should be paid to the weather change to ensure the survival of paving and rolling, and it should be completed before the rain, so as to prevent the paved lime-fly ash macadam from pouring in the rain without rolling and unable to continue the construction.

3. Take necessary rainproof measures according to local conditions. The compacted lime-fly ash macadam layer has a certain influence on the rain-proof ability. Therefore, when the subgrade survives, the gravel layer should be prepared as soon as possible. After the arrival of lime-fly ash macadam, when it rains suddenly and it is too late to spread and roll, it can be temporarily stored in a large pile, and the surface can be compacted or covered with tarpaulin.

17

Equipment installation engineering

1, the protection of raw materials and semi-finished products, can enter the warehouse or floor to cushion high pattern and ensure good ventilation, especially the entrance of thermal insulation materials, it is forbidden to rain and soak, and measures such as rain protection must be taken in time. Mechanical and electrical warehouses should have measures to prevent water from entering, and warehouses storing electrical materials or other materials and equipment that need moisture protection should be equipped with exhaust fans to keep the warehouse ventilated.

2. Materials piled in the open air, such as pipes and equipment, should be padded and covered with plastic sheets to prevent rain.

3. The mechanical and electrical equipment entering the site after unpacking must take rainproof measures to minimize outdoor storage.

4. The reserved holes of the equipment should be protected from rain. If the underground equipment of the construction site has been installed, measures should be taken to prevent the equipment from being affected with damp and being soaked by rain.

5, shearing machine, silk machine and other electromechanical processing equipment should have rain-proof facilities.

6. Outdoor welding is not suitable for rainy days; Attention should be paid to the dryness of the work area during indoor welding operation; Covered electrode should be dried before welding in rainy season; When welding in narrow space, effective ventilation measures should be taken.

18

Lightning protection method

1. In order to protect buildings, mechanical and electrical equipment, people and livestock from lightning damage and injury, lightning rods, lightning strips, lightning arresters, down leads and grounding electrode groups are generally installed for lightning protection.

2. Temporary work sheds, construction platforms, dormitories, etc. on the construction site shall take lightning protection and grounding protection measures according to actual conditions. Set lightning rod, down lead and grounding group for lightning protection.

3, lightning protection device must have a good grounding, must regularly check and measure the grounding resistance of grounding device, the grounding resistance of its independent grounding electrode is not more than 4 Ω, otherwise it should be handled in time.

4, the lightning protection grounding device for regular inspection, and strengthen the daily maintenance, focusing on the inspection of grounding wire for damage, breakage and corrosion.

5. During the lightning season, observe lightning activity. In thunderstorm weather, construction personnel should be indoors, and outdoor high-altitude and outdoor operations are not allowed.

6, mechanical equipment lightning protection measures. Tower crane and other on-site construction equipment should be properly grounded during installation. After the foundation of the building project is formed, the tower crane should be connected with the ground, and lightning protection and grounding should be done well. Tower crane power supply system power PE line and tower crane do * * * processing. The top and bottom of the external elevator guide rail are grounded respectively. Adaptive surge protector (SPD) is installed in the distribution box.

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