Technical measures for construction safety in rainy season?

Summer construction is faced with adverse environmental factors such as heavy rain, strong winds, and high temperatures, which directly endanger production safety and cause immeasurable losses to enterprises. Therefore, scientifically and rationally organizing construction, taking necessary safety technical measures, and actively responding to various dangerous conditions faced by construction during rainy periods are of great significance to improving the ability to resist risks and ensuring enterprise production safety. Zhongda Consulting brings an introduction to safety technical measures for project construction in the rainy season, which can help construction professionals in their future work.

1 General requirements for construction during rainy periods

1) Due to the uncertainty and suddenness of severe weather such as summer construction storms, it is difficult to predict the degree of construction impact and needs to be strengthened Understand meteorological information, take effective safety measures in a timely manner, and strengthen prevention.

2) Prepare a construction organization that fully considers the characteristics of construction during rainy periods, reasonably arranges indoor and outdoor operations according to weather conditions, and intersperses processes to improve efficiency and construction speed. In case of larger storm weather, Stop construction.

3) Make emergency preparations for flood prevention, rescue and disaster relief. Take effective measures to strengthen scaffolding, material hoists, elevators for both people and goods, as well as warehouses, protective sheds, temporary facilities, etc. to ensure that emergency and disaster relief materials and personnel are in place, and emergency plans are launched immediately when danger occurs.

2 Preparation measures for rainy season construction.

1) Arrange homework time reasonably. The working time should be compressed into two stages as much as possible to avoid the high temperature at noon. When the temperature exceeds 37°C, outdoor operations should be stopped. Ventilation and cooling measures should also be taken when working indoors. In the event of severe storms, all operations should be stopped.

2) According to the layout of the construction site, use the natural terrain to determine the drainage direction, and dig drainage ditches according to the specified slope to ensure unobstructed drainage. It is necessary to prepare sufficient drainage equipment and formulate a reasonable drainage plan.

3) Protect raw materials, finished products, and semi-finished products. Comprehensive and regular inspections of the material warehouse, timely maintenance, good drainage around it, solid wall foundation, no leakage or water leakage, ensuring the quality and safety of the materials

4) Set up continuous and smooth drainage facilities in strict accordance with flood control requirements, and prepare Sufficient emergency supplies, such as water pumps and related equipment, plastic sheets, linoleum and other materials.

3 Construction measures for each key sub-area during the rainy season

3.1 Earthworks and foundation projects

1) Excavation of foundation trenches (pits) or pipes during the rainy season When ditching, attention should be paid to the stability of the slope. If necessary, the slope can be appropriately slowed down or supports can be set up. During construction, inspection and control of slopes and supports should be strengthened: supports should be provided for the excavated foundation trenches (pits) or pipe trenches.

2) To prevent the slope from being exposed to rainwater or collapse, steel mesh can be nailed to the slope and 50cm of fine stone concrete can be applied; plastic sheeting can also be used to cover the slope.

3) The working surface during rainy season should not be too large and should be completed section by section and piece by piece. After the foundation is dug to the elevation, the concrete cushion should be inspected and poured in time; if the foundation is soaked by rain, excavation and backfilling should be carried out.

4) In order to prevent the foundation pit from being soaked, drainage ditches and water collection wells should be built in the foundation pit during excavation, and necessary drainage forces should be organized: During basement construction, necessary measures should be taken into consideration when sudden heavy rain occurs. measure.

5) After the foundation construction is completed, the backfilling work around the foundation pit should be carried out as soon as possible. For example, the surface of earthwork that has been backfilled before rain should be pressed to a certain slope so that rainwater can drain away automatically.

3.2 Masonry Project

The overall stability of masonry depends mainly on the adhesive and the moisture content of the masonry material. Both of these will be affected during construction during rainy periods. greater impact. Therefore, the following key points should be grasped during construction during this period:

1) Overly wet masonry should not be used in rainy season construction to avoid mortar loss and affect the quality of the masonry. Bricks must be stacked together during rainy periods and should not be watered. When building the wall, dry and wet bricks are required to be properly matched, and the height of the wall should not exceed 1m.

2) Work must be stopped in case of heavy rain, and the top of the wall should be covered with a layer of dry bricks to prevent heavy rain from washing away the mortar. The top two bricks of a newly built wall that has been washed away by rain after heavy rain should be turned over.

3) For walls between windows and independent brick columns with poor stability, temporary supports should be added or ring beams should be poured in time to increase the stability of the wall.

4) During masonry construction, the inner and outer walls should be built at the same time as much as possible, and attention should be paid to the connections between corners and T-shaped walls at the same time. The quality of the wall should be checked in time after a rain, and remedial measures must be taken for areas severely washed by rain.

33 Impregnated Concrete Engineering

1) The quality of cement and other materials should be ensured, the moisture content of sand and stone should be measured, water consumption should be adjusted in a timely manner, and the slump of concrete should be strictly controlled.

2) Before painting the template isolation layer, the weather forecast should be kept in time to prevent the isolation layer from being washed away by rain.

3) Concrete pouring should be stopped in case of heavy rain, and the poured parts should be covered. If continuous operation is required and construction joints are not allowed, rainproof measures should be taken.

4) Before pouring large areas of concrete, you should understand the 2-3 day weather forecast and try to avoid heavy rain. Sufficient rainproof materials must be prepared at the pouring site to cover them in case of sudden rain during pouring

5) When the formwork is supported, the support must be firm, the contact surface with the soil foundation must be tamped, and pads must be added. After the formwork support is completed, strict inspection should be carried out and the debris and mud in the template should be removed.

6) Outdoor welding of steel bars must not be carried out on rainy days. In case of emergency, the work should be moved indoors: the joints of the newly welded steel bars should be protected from rainwater to prevent the joints from being brittle and cracked due to sudden cooling.

3.4 Roofing project.

1) Roofing projects should be constructed before the rainy season as much as possible, and roof downpipes should be installed at the same time.

2) Coiled materials, insulation materials, etc. should be covered and not exposed to rain.

3.5 Plastering project

1) Outdoor plastering is not allowed on rainy days, and weather changes should be predicted for at least 1-2 days. For walls that have been piled, care should be taken to prevent rainwater pollution.

2) Indoor plastering should be carried out after the roof is completed. At least the roof leveling layer should be completed and a layer of linoleum should be laid.

3.6 Scaffolding

1) Many scaffoldings stand directly on earth and stone foundations. If exposed to heavy rain, they will sink, hang in the air, or overturn. Therefore, a long pad should be added to the bottom of the scaffolding and a sweeping pole should be set up as required.

2) The connecting wall rods with the building must be set up in accordance with the requirements of JGJl30-2001 specifications to enhance the overall stability and anti-overturning ability of the boom frame.

3) Anti-slip and anti-fall measures should be taken in passages on scaffolding and other places, and guardrails should be installed on both sides of the passage.

4) Regularly check the connectors at the scaffolding joints. If they are found to be loose or displaced, they must be reinforced and restored in time.

3.7 Tower cranes, material hoists and construction elevators

1) Tower cranes, material hoists and construction elevators are also key control items in rainy season construction, and their foundations must be as required above ground level and check frequently for changes.

2) Install a lightning protection device, and the grounding resistance value shall not be greater than 10O.

3) Signs must not be hung on any fuselage to prevent excessive wind loads, and measures must be taken to strengthen attachment devices.

4) Before stopping the operation, the tower crane hook should be raised to the highest forearm root, the material hoist and elevator should lower the cage to the ground, and cut off the power supply.

3.8 Construction machinery safety measures.

1) All machinery sheds must be firmly erected, and measures should be taken to prevent collapse, rain, and flooding: the mechanical installation location is slightly higher, the surrounding drainage is good, and a grounding device is installed; the leakage of the mobile switch box is Protection devices must be reliable and sensitive.

2) Effective lightning protection devices should be installed on steel pipe scaffolding, tower cranes, material hoists, people and cargo elevators, etc. The lightning protection grounding resistance shall not be greater than 10Ω.

3) The electricity used at the construction site must comply with the three-level two-pole protection of power distribution. The third-level electrical box should be grounded repeatedly, and the resistance should be less than 100. Wires and cables should be buried properly and should not be aged or damaged. All employees must disconnect the power supply of all equipment and tools before leaving get off work.

4 Improve on-site fire safety

1) Strengthen the protection of warehouses and carpentry areas, especially the management of fire sources.

2) Strengthen construction electricity inspection to prevent short-circuit accidents; arrange construction cables reasonably, and flammable objects should not be close to cables.

3) Strengthen the management of flammable items and store them in special storage. Oxygen, acetylene, etc. are prohibited from being stored in the open air and must be protected against lightning and sun.

5 Food safety and health care measures at the construction site

1) The employee dormitories comply with the requirements of relevant regulations, keep them ventilated and dry, take anti-fly, anti-mosquito and anti-rat measures, and maintain The surrounding environment is hygienic.

2) Take cooling measures, prepare heatstroke prevention medicines and cooling foods, and do a good job in cooling and heatstroke prevention.

3) We should do a good job in canteen management, improve canteen conditions, maintain good ventilation, and disinfect regularly to ensure that all food and vegetables are fresh and consumed on the same day when purchased, and at the same time open the refrigerator to refrigerate meat: Measures must be taken to prevent rats, flies and mosquitoes; ensure the food safety of employees and avoid poisoning incidents.

4) Set up a medical and health room on the construction site, equipped with some commonly used drugs and some equipment, to provide daily health care for workers and timely rescue in the event of an accident.

6 Safety Inspection

1) Managers at all levels should strengthen safety inspections, discover problems in a timely manner and deal with them. Conduct regular inspections on the main body of the building, scaffolding, construction electricity, tower cranes, material lifting willows, formwork support systems, rainproof shelters of various small machinery, temporary facilities, and safety signs, and promptly identify and eliminate problems.

2) Outdoor signaling operations should be stopped immediately during a storm, personnel should be quickly evacuated to a safe place, and the power supply should be cut off decisively: outdoor operations should be stopped in weather conditions above 3°C.

3) Strengthen training and education for all types of personnel, strengthen the learning of safe construction knowledge in summer, and improve self-prevention and emergency response capabilities.

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