Rainproof measures for rainy season construction of steel structure engineering

The rainy season has arrived, and this year the whole country has entered the sea watching mode, and the rain has been falling, but the construction period cannot wait. How to ensure the normal construction of the steel structure in the rainy season, and how to ensure the quality of the project in the rainy season? Through 16 years of professional steel structure construction experience, Xirong Steel Structure Construction has compiled very practical construction measures for you for the rainy season construction of steel structure engineering for the main processes of steel structure and climate-sensitive processes.

During the rainy

season, it is necessary to keep abreast of the weather forecast and grasp the rainy weather data in advance. Arrange special personnel to inspect and manage the on-site special items before the rain, and rectify the places that do not meet the rain prevention measures or the measures are not standardized, especially for the lightning protection measures, they must be carefully and meticulously inspected.

1. Rainproof measures for steel structure engineering construction

High-strength bolt installation cannot be carried out on rainy days, and there must be no rain on the friction surface and high-strength bolt.

When the weather is harsh during the rainy period, the process requirements cannot be met and the safe construction cannot be guaranteed, the construction should be stopped. At this time, attention should be paid to ensuring the safety of the working surface and setting up necessary temporary reinforcement measures.

During the rainy season construction, the needs of rainproof water equipment for construction personnel should be ensured. Pay special attention to the protection of electricity for construction. When it rains, except for special circumstances, high-altitude operations should be stopped, and high-altitude personnel should be evacuated to the safety inspection area and the electric gate should be turned off.

Steel structure hoisting needs to hang the façade net on the outside of the building, and protective railings must be erected at the internal staircase of the building, adjacent to the building, and the opening that cannot be covered.

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 up and the surface layer should be dry.

If the wind is greater than 5, rain and dense fog, stop the supporting process of high-altitude lifting and installation; Such as welding, paving steel plates, wearing high-strength bolts, correcting structures, etc.

Second, steel structure engineering materials rainproof measures

1. Template rainproof measures

When stacking, the lowest layer of the formwork must be raised with the ground to prevent rainwater soaking damage. At the formwork stacking place, there must be effective ground drainage measures to prevent rainwater siltation.

Before rain, the formwork and wooden back flute must be effectively covered with plastic sheeting in time.

During the construction of the formwork

in rainy weather, the beam and wall formwork must be left with a sweeping port or water outlet, and the formwork release agent should be covered with plastic sheeting in case of rain after the formwork release agent is applied to prevent the isolation layer from being washed away by rainwater. The formwork isolation layer washed by rain must be repainted before closing.

2. Steel bar rainproof measures

The steel bar that has been placed on site for a long time is covered by rain to prevent serious rust of the steel bar. The rebar stacking site must have good drainage to prevent rainwater siltation from soaking the rusted rebar.

In principle, stop steel bar welding in rainy days, and if welding is carried out under special circumstances, there must be rainproof measures to prevent rain from wetting the welding joint and causing the mechanical properties of the steel bar to change or decrease, thereby affecting the process quality.

3. Scaffolding rainproof measures

The fasteners of the scaffolding

must be inspected one by one before and after the rain, and during the inspection process, it must first be checked whether the foundation of the scaffolding is firm. In the process of inspection, construction and inspection personnel must ensure that their own safety protection measures are in place, pay attention to anti-slip and anti-fall, and strictly prohibit illegal command.

4. Electricity and rain prevention measures

The leakage protection devices of various electrical appliances must be sensitive, regularly check all kinds of construction lines, and the insulation outsourcing must be intact and undamaged to prevent people from being injured by rainwater leakage; The outdoor welding machine, grinder, wire nesting machine and other equipment should be equipped with a canopy in the upper part, and the lower part should adopt a support pad method to prevent rain soaking.

The power cord must not be erected with bare or plastic wires, and the distribution box must be protected from rain. The metal skin of the electromechanical equipment must adopt reliable zero protection, and the leakage protection device of the mobile electric gate box must be reliable.

Any mechanical operator must hold a certificate to work, and wear insulating rubber shoes and insulating gloves according to regulations.

In case of heavy rain to

stop all mechanical and electrical operations, the general electrical box of the on-site steel processing plant must be turned off the power, after the rain should be timely organized to check the safety performance of machinery and electrical appliances, heavy rain weather is strictly forbidden to carry out equipment and components lifting and manual handling of materials or equipment.

The cables, wires, etc. used on site are strictly prohibited from being soaked in rainwater or laid on wet ground, and should be installed overhead or buried and safe and reliable protective measures should be installed.

Before the construction in the rainy season, the grounding and insulation of the power supply, electrical box, tower crane and other items on the site should be shaken and recorded.

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

Third, the rainproof measures of important processes of steel structure engineering

1. Welding of steel structure

Before construction, the operation platform should be wrapped with

flame retardant woven cloth around the column 1m higher than the weld, and the holes and seams on the plane of the platform should be covered with asbestos cloth to prevent wind and splashing of welding slag. In principle, open-air welding is not carried out on rainy days.

For the welded seam, it is necessary to strengthen the heat preservation work to avoid the sudden drop in the temperature of the weld resulting in brittle cracks, first wrap the weld with asbestos cloth, and then wrap it tightly with rock wool.

Welding machines, welding wires, and gas cylinders should be placed in a special shed. So as not to get the welding material damp.

2. Installation of high-strength bolts

The installation of high-strength bolts is above the 5th level wind, and the operation is stopped in rainy and dense foggy weather.

Before using high-strength bolts, the

appearance inspection of high-strength bolts should be carried out, and there should be no rust, damage to the wire buckle, and if there is any, it should be repaired and used.

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

3. Other security measures

The anti-skid strips

of the horse road are firmly tied, and the anti-skid strips are regularly inspected and reinforced to prevent accidental fall injuries of upper and lower personnel.

Immediately after the rain, organize manpower to clean up the stagnant water on the floor slab, horse road, etc. Special attention is paid to the fact that the scaffolding is slippery after rain, and the operator pays special attention to anti-slip and anti-falling.

Protective fences or warning signs should be set up at potholes to prevent people from slipping.

During the rainy period, the lightning protection device of the on-site freight elevator must be checked regularly.

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

The rainy season weather is sultry, and logistics should do a good job in preventing heat and cooling of construction personnel.

4. Sanitation measures

Thoroughly inspect all kinds of machinery before construction during the rainy period, and set up oil trays as required to prevent pollution of the environment by rainwater.

Clean up the garbage on site in time, if it cannot be cleaned up in time, the garbage must be covered to prevent it from being washed by rain.

Toxic and harmful garbage must be collected into the sorting garbage room in a timely manner.

Toxic and harmful materials must be stacked in a classified warehouse.

On rainy days, steel bars and steel components are wrapped with plastic sheeting.

Steel structure engineering

is different from other construction projects, the main materials of steel structure engineering are mostly related to metal, easy to conduct, easy to rust. At the same time, steel structure construction is mostly in high places, and the risk factor will increase a lot in thunderstorm weather, so as a steel structure companion, Xirong steel structure construction reminds everyone that the rainy season must do a good job of rainproof measures for steel structure engineering