Rain-proof, wind-proof, lightning-proof, electricity-proof, flood control and other work must be done well in the rain period construction. Mechanical equipment should be located in a high-lying, moisture-proof and rain-proof place, and a fortified canopy should be built. Anti-skid measures should be taken for scaffolding, which should be cleaned in time after rain, and the safety measures of scaffolding and electrical equipment should be checked at any time. Then I will show the hidden dangers and technical methods of the rainy season construction site, and welcome everyone to read and browse.
I. Potential safety hazards in flood season
1. 1 Earthwork
1, in the rainy season, surface water is easy to flow into the foundation pit and groove formed by earthwork excavation, forming accumulated water, which will affect further construction;
2. Rainwater increases the water content of soil, and it is easy to landslide or collapse when excavating foundation pits and troughs. It not only causes great difficulties to the next construction, but also may have major security risks;
3. When the backfill soil is soaked by rain, it has high water content and is easy to appear? Rubber soil? ;
1.2 engineering materials
1, also should pay attention to when reinforced pile up. Rainwater immersion will corrode steel bars, and it will also have a certain impact on the performance of steel bar materials. In addition, the soil will also pollute the steel bar, which will also have a certain impact on the next working procedure.
2. Rainwater will affect the water content of sand and gravel in concrete, so it must be monitored continuously in real time. In addition, once the mass concrete is soaked in rain, it cannot be used.
3. Concrete cannot be washed and soaked by rain before final setting. If it is not well protected, the surface will be destroyed, and the repair process will be increased, which will affect the next construction.
1.3 external equipment
1. The large electromechanical equipment, temporary lines and external supports on the construction site will tilt, deform, sink, leak electricity and be struck by lightning in a thunderstorm.
2. When hoisting after rain, first check the stability of the crane to ensure the safety of the crane. You should be extra careful when you start working. Because the surface of the hanging rope and parts is wet after rain, the friction between them is reduced, so you must pay special attention.
1.4 temporary works and others
1, temporary migrant workers dormitory if waterproof measures are not in place, will inevitably affect the lives of workers, affecting the health of workers; In addition, sudden flood accidents will occur in the rainy season. If the protection of workers' dormitories and work areas is not in place, it will bring great influence and loss.
2. All auxiliary construction measures, such as temporary scaffolding, must be checked on time in rainy days to avoid looseness or inclination. Workers who work on scaffolding in rainy days are prone to slip and fall.
Second, the rainy season construction technical points
2. 1 Earthwork and Foundation Works
Earthwork and foundation works are easily affected by rain. If the corresponding preventive measures are not taken, the construction quality and safety may be greatly affected. Therefore, in the rainy season construction, should pay attention to the following six points:
1. When excavating pipe trench or foundation trench in rainy season, attention should be paid to the stability of slope. If necessary, the slope can be slowed down or supported appropriately. In the process of construction, we should strictly check the slope and support regularly; Appropriate support should be provided for trenching or foundation trench; For the trench or foundation trench being excavated, it is mainly to slow down its slope, supplemented by setting support; In the case of rainy and heavy rainfall, the construction should be temporarily stopped.
2. In terms of slope protection, in order to avoid the situation that the slope is washed down by heavy rain. Nail nets can be added to the slope and coated with concrete with a thickness of about 50cm, or plastic sheets can be covered on the slope.
3. The rainy season construction, the construction area should not be too large, should be completed by stages.
4. In order to prevent the foundation pit from being soaked, when excavating the foundation pit, the corresponding collecting well and drainage ditch should be dug in the pit, and the necessary drainage equipment should be arranged; Relevant structures at the bottom of the pit should also be considered during construction to avoid the floating phenomenon of structures in heavy rain after completion.
5. Before the rain, the backfilled earthwork should be rolled in time, and its surface should be trimmed into a certain slope to facilitate rainwater drainage.
6. Various protective measures should be taken around the earthwork piled on site.
2.2 engineering materials
1. Rain-proof materials shall be reserved at the road construction site. Materials used in construction should be stored horizontally, and rain and sun protection measures should be taken. The storage site should be kept dry, and the bottom layer should be placed on a flat mat. Loose materials, such as sand, should be protected around the pile to avoid being washed away by rain.
2. Effective rainproof measures should be set up in the steel bar stacking area. Steel bars should be supported by steel pipes and covered with asbestos tiles or multi-layer boards to ensure that steel bars will not be corroded by rain and snow. Prevent rust water generated by corrosion of steel bars from infiltrating into underground soil and underground water sources. Drainage ditches should be set around the steel yard to ensure that the nearby surface water can be smoothly discharged into the sedimentation tank through the drainage ditches, so as to avoid the polluted surface water polluting the soil layer.
3, the scene should arrange personnel to test the weather, in case of strong winds, rainfall and other weather changes, should take timely measures to strengthen the coverage of items. At the same time, when the wind force is greater than 4, stop the transportation, loading and unloading and screening of cement and gravel to avoid dust. During construction in rainy season, the water content of coarse and fine aggregates should be measured in each shift, and the sand and gravel materials should be covered as much as possible, at least not exposed to the sun before use, and cold water can be used to evaporate and dissipate heat when necessary. During the rainy season, concrete construction should be arranged according to the weather forecast to avoid rainy days; If it is unavoidable, prepare plastic film. When it begins to rain, cover the uncondensed concrete with plastic sheets, and stop concrete mixing at the same time to prevent the rain from wasting materials.
2.3 External equipment and other temporary facilities, etc.
1, mechanical operation shed (such as mixer, hoist, electric welding machine, woodworking machinery, steel processing machine, etc.). ) must be firmly erected to prevent rainwater leakage and water accumulation. Electrical and mechanical equipment shall be well protected by grounding or zero connection according to relevant regulations, and its effectiveness and sensitivity shall be regularly checked and tested.
2. Before the construction in the rain period, all power lighting lines and power supply and distribution electrical facilities should be thoroughly inspected, and the existing lines are aging, poorly installed, cracked porcelain bottles, reduced insulation and leakage. , must be replaced in time. Distribution box, switch box, etc. , should be waterproof, moistureproof, smoke prevention, lightning protection and other measures, the shell should be well grounded. When erecting lines and laying lightning protection systems, you should master the weather forecast, and it is strictly forbidden to work in thunderstorm weather. On-site construction cables should be arranged centrally to prevent confusion, and unnecessary cables should be recycled in time.
3, the rain period construction, should check the lifting device, to ensure the stability and safety of the lifting device. When entering the hoisting operation, you must be extra careful, pay attention to the anti-slip between the lifting rope and the component after rain, and increase its safety. In addition, construction personnel should also strengthen the inspection of safety equipment in rainy season to prevent slipping and falling during construction.
4. In rainy season, temporary migrant workers' dormitories should establish protective measures to ensure workers' living requirements, and overlay facilities in low-lying areas should take flood control measures, pay close attention to surrounding geology, and make safety warnings in time to ensure the life and personal safety of construction workers.
Third, the rainy season construction requirements
3. 1 comprehensive protection
The construction site covers a wide range, including engineering materials, temporary facilities, various parts of the site and the safety protection of staff. Therefore, on the basis of ensuring the construction quality and construction period, the formulation of safety measures must be meticulous, thoughtful and comprehensive to prevent all kinds of hidden dangers.
1. Before the rainy season comes, the project department should make a flood control plan and a rainy season emergency plan, including the site and surrounding environment. Set full-time flood control personnel at night to ensure that someone is on duty day and night, and make corresponding records. At the same time, we should set up a weather forecast, listen to and release the weather situation in time. The construction unit shall organize relevant departments to carry out drills, arrange full-time personnel to check the site drainage at any time, regularly check various leak-proof facilities, and transform the drainage system to ensure smooth drainage.
2, timely repair the site construction service road, ensure the smooth transportation road, and do a good job in subgrade drainage measures.
3. The residence, material stacking area, mechanical parking area and production facilities of the project department should be located above the highest flood level or on high ground, and far away from the dangerous area, so that these areas can keep a certain safe distance from the project department, and do a good job in leakage prevention of the roof, wall and ground of the warehouse.
3.2 Ensure smooth information flow
Information is the main part to ensure the scientific management of enterprises. In rainy season, if natural information such as rainstorm can't be controlled in time, it will cause unpredictable losses to construction projects because of its suddenness. During construction in rainy season, the construction unit must arrange special personnel to collect meteorological information, pay attention to weather changes, give early warning and make preparations. Construction enterprises should strengthen information management, grasp useful information in time, and take effective precautions according to specific conditions.
3.3 Scientific organization of construction
According to the characteristics of engineering geology, arranging construction projects before or after the rainy season is not conducive to making targeted construction plans and making relevant organizational measures according to the facts. In addition, according to the specific conditions of the construction site and weather changes, indoor and outdoor operations should be arranged reasonably to improve the construction speed and efficiency. If the construction work cannot be carried out normally due to bad weather, the construction of the project should be temporarily stopped.
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