How to construct steel structure project in continuous rainy season

1. Rainproof measures

Arrange a special person to understand the weather forecast in time and grasp the rainy weather data in advance. Arrange a special person to carry out special inspection and management of the site before the rain. For areas that do not meet the rainproof measures or the measures are not standardized, subcontracting and rectification must be ordered within a time limit, especially for lightning protection measures.

1.1 Formwork rain protection measures

When the formwork is stacked, the bottom layer must be elevated above the ground to prevent rainwater from soaking. At the place where the formwork is piled up, there must be effective ground drainage measures to prevent rainwater from accumulating.

Before it rains, the formwork and the wood backing must be effectively covered with plastic cloth in time.

During the construction of the rainwater formwork, the beam and wall formwork must be provided with a cleaning port or a water outlet. After the formwork release agent is applied, it should be covered with plastic cloth to prevent the insulation layer from being washed away by rain. The template insulation layer washed by rain must be repainted before clamping.

1.2 Reinforcement measures for rain

Cover the steel bars that have been on the site for a long time to prevent rain and prevent serious corrosion. Rebar stacking sites must have good drainage to prevent rainwater from soaking and rusting the rebar.

In rainy days, the welding of steel bars should be stopped in principle. If welding is required under special circumstances, there must be rain prevention measures to prevent rain from wetting the welded joints to change or reduce the mechanical properties of the steel bars and affect the process quality.

1.3 Concrete rain protection measures

Do a good job of pumping the aluminum fluoride plant,

l In case of heavy rain, you should stop pouring concrete to keep the construction joints in a more reasonable position and do well on-site drainage work. The concrete of the poured part must be covered with plastic cloth in time to prevent changing the mix ratio of the concrete and reducing the strength level of the concrete. Affect the quality of the project.

l Before pouring concrete, the dirt and stagnant water in the formwork must be cleaned before pouring concrete.

l Before the concrete is poured, the weather forecast must be accurately grasped to avoid heavy rain during pouring, and sufficient rainproof materials should be prepared on the site to cover the sudden rain when pouring.

l During the construction in the rainy season, the concrete mixing station is required to adjust the water consumption of the concrete in time according to the actual moisture content of the sand and stone to ensure the quality of the concrete. When pouring in rainy days, it is required to appropriately reduce the concrete slump of the factory.

1.4 Rainproof measures for steel structures

In order to ensure the normal construction of the rainy season, the quality of the project is guaranteed. The main procedures and climate-sensitive procedures of this project shall be prepared with corresponding technological measures according to the characteristics of the rainy season construction.

Rainy days cannot be installed with high-strength bolts, and there must be no rain on the friction surface and high-strength bolts.

When the weather is bad during the rainy season, the construction should be stopped when the process requirements cannot be met and safe construction cannot be guaranteed. At this time, care should be taken to ensure the safety of the working surface and necessary temporary reinforcement measures should be set up.

l Construction in the rainy season should ensure the needs of the construction staff's rainwater prevention equipment. Pay particular attention to electrical protection during construction. When it rains, except in special circumstances, high-altitude operations should be stopped, high-altitude personnel should be evacuated to the safety inspection zone, and the power switch should be turned off.

l For steel structure hoisting, a net of facades should be hung on the outside of the building, a stairway inside the building, a building adjacent to it, and a non-covered opening should be covered with guardrails.

For the components to be lifted, the water on the surface of the component should be cleaned first, especially the friction surface of the component should be cleaned, and the surface layer should be dry.

Wind power is greater than 5 levels, raining, dense fog weather, the supporting process of high-altitude lifting and installation is stopped; such as welding, laying steel plate, wearing high-strength bolts, correcting structure, etc.

1.4.1 Welding of steel structures

Before construction, the operation platform should be wrapped around the pillars with flame-resistant woven cloth at a height of 1m above the weld, and the holes and seams on the plane of the platform should be covered with asbestos cloth to prevent wind and welding slag. In principle, no open-air welding operations are performed on rainy days.

For the welded seam after welding, the insulation work should be strengthened to avoid brittle cracks caused by the sudden drop in the temperature of the weld seam. Firstly, use asbestos cloth to cover the weld seam, and then use rock wool to cover it.

Welders, welding wires and gas cylinders should be placed in special sheds. To prevent the welding material from getting wet.

1.4.2 Installation of high-strength bolts

The installation of high-strength bolts is above Class 5 wind, and the operation is stopped in rain and dense fog.

Before using the high-strength bolts, the appearance inspection of the high-strength bolts shall be carried out. There shall be no rust or damage to the threaded fasteners. If necessary, repair them before use.

Before the operation, the moisture and impurities in the connection part of the connection piece should be removed, and the connection surface should be clean and dry.

1.5 Scaffolding Rainproof Measures

Before and after the rain, the fasteners of the scaffold must be inspected one by one, and the foundation of the scaffold must be checked for firmness during the inspection process. During the inspection process, construction and inspection personnel must ensure that their own safety protection measures are in place, pay attention to anti-skid and fall prevention, and strictly prohibit command violation.

1.6 Rainproof measures against electricity

The electrical leakage protection devices of various electrical appliances must be sensitive. Periodically inspect various construction wires. The insulation outsourcing must be intact and not damaged to prevent injury due to rain leakage. The upper parts of equipment such as electric welding machines, grinders, and threading machines should be installed. In rain sheds, support pads are used at the bottom to prevent rainwater from soaking.

Power lines must not be installed with bare or plastic wires, and the distribution box must be protected from rain. The metal sheath of the electromechanical equipment must be reliably connected to zero, and the leakage protection device of the motorized switch box must be reliable.

Any machine operator must hold a certificate to work, and wear insulated rubber shoes and insulated gloves as required.

In the event of heavy rain, stop all electrical and mechanical operations. The main electrical box at the on-site steel processing plant must be powered off. In the event of rain, the safety performance of machinery and electrical appliances should be organized and checked. Lifting of equipment and components and manual handling of materials or equipment are strictly prohibited during heavy rain .

The cables and wires used on the site are strictly forbidden from soaking in rain or laying on wet ground. They should be installed overhead or buried and provided with safe and reliable protection measures.

Before the construction in the rainy season, shake the test of the power supply, electrical box, grounding and insulation of the tower crane, and make a record.

After rain, all electrical equipment and electrical boxes should be inspected once. The doors of each electrical box must be closed and must not be open.

2. Other security measures

The anti-slip strips on the road are securely tied, and the anti-slip strips are regularly checked and reinforced to prevent accidental falls and injuries.

Immediately after the rain, organize manpower to clean up the stagnant water on the floor and horse tracks. Pay special attention to the fact that the scaffold is slippery after the rain, and the operator pays special attention to anti-slip and fall prevention.

Protective fences or warning signs should be set up in potholes to prevent personnel from falling down.

During the rainy season, the lightning arrester of the freight elevator on site must be checked regularly.

On-site construction personnel, safety officers, and technicians regularly conduct on-site safety inspections during the rainy season and deal with problems in a timely manner.

The weather is sultry during the rainy season, and the logistics staff must do a good job of preventing heatstroke and cooling.

3. Sanitation measures

Thoroughly inspect all kinds of machinery before construction in the rainy season, and set up oil pans as required to prevent the environment from being washed by rain.

Clean up the on-site garbage in a timely manner. If it cannot be cleaned in time, it must be covered to prevent it from being washed away by rain.

Toxic and harmful garbage must be collected in a garbage room in time.

Toxic and harmful materials must be stacked in the sorting warehouse.

On rainy days, wrap steel and steel members with plastic sheets.

Care must be taken to control noise during construction.1. Rainproof measures

Arrange a special person to understand the weather forecast in time and grasp the rainy weather data in advance. Arrange a special person to carry out special inspection and management of the site before the rain. For areas that do not meet the rainproof measures or the measures are not standardized, subcontracting and rectification must be ordered within a time limit, especially for lightning protection measures.

1.1 Formwork rain protection measures

When the formwork is stacked, the bottom layer must be elevated above the ground to prevent rainwater from soaking. At the place where the formwork is piled up, there must be effective ground drainage measures to prevent rainwater from accumulating.

Before it rains, the formwork and the wood backing must be effectively covered with plastic cloth in time.

During the construction of the rainwater formwork, the beam and wall formwork must be provided with a cleaning port or a water outlet. After the formwork release agent is applied, it should be covered with plastic cloth to prevent the insulation layer from being washed away by rain. The template insulation layer washed by rain must be repainted before clamping.

1.2 Reinforcement measures for rain

Cover the steel bars that have been on the site for a long time to prevent rain and prevent serious corrosion. Rebar stacking sites must have good drainage to prevent rainwater from soaking and rusting the rebar.

In rainy days, the welding of steel bars should be stopped in principle. If welding is required under special circumstances, there must be rain prevention measures to prevent rain from wetting the welded joints to change or reduce the mechanical properties of the steel bars and affect the process quality.

1.3 Concrete rain protection measures

Do a good job of pumping the aluminum fluoride plant,

l In case of heavy rain, you should stop pouring concrete to keep the construction joints in a more reasonable position and do well on-site drainage work. The concrete of the poured part must be covered with plastic cloth in time to prevent changing the mix ratio of the concrete and reducing the strength level of the concrete. Affect the quality of the project.

l Before pouring concrete, the dirt and stagnant water in the formwork must be cleaned before pouring concrete.

l Before the concrete is poured, the weather forecast must be accurately grasped to avoid heavy rain during pouring, and sufficient rainproof materials should be prepared on the site to cover the sudden rain when pouring.

l During the construction in the rainy season, the concrete mixing station is required to adjust the water consumption of the concrete in time according to the actual moisture content of the sand and stone to ensure the quality of the concrete. When pouring in rainy days, it is required to appropriately reduce the concrete slump of the factory.

1.4 Rainproof measures for steel structures

In order to ensure the normal construction of the rainy season, the quality of the project is guaranteed. The main procedures and climate-sensitive procedures of this project shall be prepared with corresponding technological measures according to the characteristics of the rainy season construction.

Rainy days cannot be installed with high-strength bolts, and there must be no rain on the friction surface and high-strength bolts.

When the weather is bad during the rainy season, the construction should be stopped when the process requirements cannot be met and safe construction cannot be guaranteed. At this time, care should be taken to ensure the safety of the working surface and necessary temporary reinforcement measures should be set up.

l Construction in the rainy season should ensure the needs of the construction staff's rainwater prevention equipment. Pay particular attention to electrical protection during construction. When it rains, except in special circumstances, high-altitude operations should be stopped, high-altitude personnel should be evacuated to the safety inspection zone, and the power switch should be turned off.

l For steel structure hoisting, a net of facades should be hung on the outside of the building, a stairway inside the building, a building adjacent to it, and a non-covered opening should be covered with guardrails.

For the components to be lifted, the water on the surface of the component should be cleaned first, especially the friction surface of the component should be cleaned, and the surface layer should be dry.

Wind power is greater than 5 levels, raining, dense fog weather, the supporting process of high-altitude lifting and installation is stopped; such as welding, laying steel plate, wearing high-strength bolts, correcting structure, etc.

1.4.1 Welding of steel structures

Before construction, the operation platform should be wrapped around the pillars with flame-resistant woven cloth at a height of 1m above the weld, and the holes and seams on the plane of the platform should be covered with asbestos cloth to prevent wind and welding slag. In principle, no open-air welding operations are performed on rainy days.

For the welded seam after welding, the insulation work should be strengthened to avoid brittle cracks caused by the sudden drop in the temperature of the weld seam. Firstly, use asbestos cloth to cover the weld seam, and then use rock wool to cover it.

Welders, welding wires and gas cylinders should be placed in special sheds. To prevent the welding material from getting wet.

1.4.2 Installation of high-strength bolts

The installation of high-strength bolts is above Class 5 wind, and the operation is stopped in rain and dense fog.

Before using the high-strength bolts, the appearance inspection of the high-strength bolts shall be carried out. There shall be no rust or damage to the threaded fasteners. If necessary, repair them before use.

Before the operation, the moisture and impurities in the connection part of the connection piece should be removed, and the connection surface should be clean and dry.

1.5 Scaffolding Rainproof Measures

Before and after the rain, the fasteners of the scaffold must be inspected one by one, and the foundation of the scaffold must be checked for firmness during the inspection process. During the inspection process, construction and inspection personnel must ensure that their own safety protection measures are in place, pay attention to anti-skid and fall prevention, and strictly prohibit command violation.

1.6 Rainproof measures against electricity

The electrical leakage protection devices of various electrical appliances must be sensitive. Periodically inspect various construction wires. The insulation outsourcing must be intact and not damaged to prevent injury due to rain leakage. The upper parts of equipment such as electric welding machines, grinders, and threading machines should be installed. In rain sheds, support pads are used at the bottom to prevent rainwater from soaking.

Power lines must not be installed with bare or plastic wires, and the distribution box must be protected from rain. The metal sheath of the electromechanical equipment must be reliably connected to zero, and the leakage protection device of the motorized switch box must be reliable.

Any machine operator must hold a certificate to work, and wear insulated rubber shoes and insulated gloves as required.

In the event of heavy rain, stop all electrical and mechanical operations. The main electrical box at the on-site steel processing plant must be powered off. In the event of rain, the safety performance of machinery and electrical appliances should be organized and checked. Lifting of equipment and components and manual handling of materials or equipment are strictly prohibited during heavy rain .

The cables and wires used on the site are strictly forbidden from soaking in rain or laying on wet ground. They should be installed overhead or buried and provided with safe and reliable protection measures.

Before the construction in the rainy season, shake the test of the power supply, electrical box, grounding and insulation of the tower crane, and make a record.

After rain, all electrical equipment and electrical boxes should be inspected once. The doors of each electrical box must be closed and must not be open.

2. Other security measures

The anti-slip strips on the road are securely tied, and the anti-slip strips are regularly checked and reinforced to prevent accidental falls and injuries.

Immediately after the rain, organize manpower to clean up the stagnant water on the floor and horse tracks. Pay special attention to the fact that the scaffold is slippery after the rain, and the operator pays special attention to anti-slip and fall prevention.

Protective fences or warning signs should be set up in potholes to prevent personnel from falling down.

During the rainy season, the lightning arrester of the freight elevator on site must be checked regularly.

On-site construction personnel, safety officers, and technicians regularly conduct on-site safety inspections during the rainy season and deal with problems in a timely manner.

The weather is sultry during the rainy season, and the logistics staff must do a good job of preventing heatstroke and cooling.

3. Sanitation measures

Thoroughly inspect all kinds of machinery before construction in the rainy season, and set up oil pans as required to prevent the environment from being washed by rain.

Clean up the on-site garbage in a timely manner. If it cannot be cleaned in time, it must be covered to prevent it from being washed away by rain.

Toxic and harmful garbage must be collected in a garbage room in time.

Toxic and harmful materials must be stacked in the sorting warehouse.

On rainy days, wrap steel and steel members with plastic sheets.

Care must be taken to control noise during construction.