general requirements
Indoor engineering construction is not affected in rainy season, outdoor engineering construction is uninterrupted in light rain, and construction is suspended in heavy rain. Construction can be started after heavy rain, and construction will not be affected after heavy rain. Ensure the normal construction and production throughout the rainy season, and ensure the engineering entities, materials, equipment and facilities. No damage, no safety accidents.
Preparation for rainy season construction
Construction in flood season should be well prepared from the following aspects: make full preparations as soon as possible from the aspects of organization, technical measures, on-site materials and emergency plans, so as to implement ideas, organizations, measures and materials.
Organizational preparation
The project department set up a leading group for rainy season construction, which is responsible for organizing the production, technology, quality and safety management of rainy season construction and the supply of rainy season materials, coordinating rainy season construction, clarifying responsibilities, ensuring that all work is carried out in a timely and effective manner during rainy season construction, and avoiding the impact on production progress, engineering quality and safe construction due to poor organization of rainy season construction.
technical reserve
1, before the rainy season construction, the preparation and disclosure of the rainy season construction plan should be done well, and the site foreman should make a written technical disclosure to the construction team according to the construction plan.
2. Designate a special person to observe and record the weather, listen to the weather forecast, and prevent the sudden attack of heavy rain and heavy rain.
Site preparation
1. According to the physical quantity, organize relevant machines and materials to enter the site in advance.
2. The road on the construction site must be smooth and solid, with drainage facilities on both sides, and the longitudinal gradient shall not be less than 0.3%. The main pavement should be paved with anti-skid materials such as slag and gravel, and the important transportation routes must be unblocked.
3. For projects that are not suitable for rainy season construction, it is necessary to arrange in advance or temporarily. For those that cannot be interrupted, it is necessary to mobilize human resources to organize rapid construction and shorten the construction time in rainy season as much as possible.
4. The site temporary power lines should be well insulated and overhead, and the power switch box should have rain-proof facilities. Strictly implement the "three-phase five-wire system" to ensure three-level distribution and two-level protection. Rain-proof facilities of various power distribution facilities should be well protected. In case of rainstorm, cut off the main power supply immediately and prepare emergency lighting equipment. After the flood, conduct a comprehensive inspection and acceptance of the distribution system, and then send electricity for construction. Water pipes should go underground without leakage, and valves should be protected.
5, distribution box, cable connector, junction box, welding machine, etc. Rain-proof measures must be taken to prevent leakage or equipment accidents caused by flooding and humidity.
6, all mechanical operation, must strictly abide by the corresponding safety technology operating rules, during the rainy season construction should strengthen education and supervision and inspection.
7, a comprehensive inspection of the security situation of the overlay facilities, such as cracks, tilt, deformation phenomenon, timely reinforcement, renovation, can not meet the requirements must be demolished and rebuilt; Rainstorm weather must arrange uninterrupted inspections by special personnel; Observe the influence and damage of the wind direction on the overlay facilities at any time, and the damage that the foundation pit, scaffolding and lifting equipment may cause to the overlay facilities. If there is any danger, immediately transfer the personnel to a safe place.
8. Observe whether there are cracks and collapses on the foundation pit slope, whether there is deformation on the foundation pit support, and the changes of adjacent buildings and structures on the foundation pit slope; Focus on inspection and monitoring of foundation pit facilities near streets, buildings and overlay facilities; If there are major safety hazards, immediately close the dangerous area, evacuate personnel to stop construction, set up safety warning signs, assign special personnel to be on duty, prohibit irrelevant personnel from approaching the dangerous area, and report immediately; After the flood season, the foundation pit facilities should be comprehensively inspected, and the construction can be started only after there is no potential safety hazard.
Emergency reserve
1. Make emergency plans and organize emergency drills.
2. Set up on-site communication liaison group, material support group, emergency rescue group, aftermath treatment group, cause investigation group and other offices to carry out emergency treatment of dangerous floods and clarify the responsible person and contact person.
3, quickly start the emergency plan after receiving the danger report, command and coordinate the rescue work at the scene of the water disaster.
4. After the dangerous accident, verify the casualties and losses on site, and report the progress of emergency rescue and emergency treatment to the relevant departments of the local government and emergency headquarters in time.
5, timely implement the spirit of emergency headquarters and superior leadership instructions.
6. Continue to report the reported progress of emergency repair at any time. After the emergency repair is completed, a complete written material should be formed within 24 hours.
7. The hydrometeorological group pays close attention to the weather forecast of the Meteorological Bureau and the hydrological conditions of the rivers along the line every day, and reports it in time according to the actual situation in the region.
Technical measures for construction in rainy season
The difficulty of construction in rainy season lies in the construction process of building structure, which is concentrated in the construction stage below 0.000. Therefore, if foundation pit excavation, foundation pit support and underground structure construction are all in the rainy season, protecting foundation pit is the top priority of construction safety in the rainy season.
Rainproof measures for foundation pit support construction
1, when foundation pit supporting engineering is carried out in rainy season, prepare water pump before earthwork excavation.
2, the rainy season construction, mechanical digging, slope must be strictly in accordance with the provisions, the slope should be slower than normal construction, prepare more plastic sheets to cover, timely protect the slope and hanging net shotcrete pile soil. It is forbidden to pile up sundries within 3m from the top of the foundation pit. After the foundation pit (trough) is dug, concrete cushion should be laid in time, and drainage ditches and collecting wells should be set around the foundation pit to ensure smooth drainage at any time.
3, the construction road from the foundation pit mouth shall not be less than 5 m. ..
4. During the foundation pit construction, always pay attention to the stability of the slope, organize evacuation in time when cracks and landslides are found, and continue the construction after reinforcement measures are taken and confirmed.
5. During foundation pit excavation, a water retaining wall should be made along the edge of the foundation pit, and a sump or drain should be set around the foundation pit to prevent surface water from flowing into the foundation pit. Before foundation pit cushion, silt should be removed before construction.
6. When backfilling, the accumulated water in the foundation pit shall be discharged in time, and the backfill shall be compacted by layers, and the dry bulk density shall meet the design and specification requirements.
7, concrete foundation construction, consider to prepare for rain and drainage, prevent the rain soaking, scouring and affect the quality.
8. Before supporting pile foundation construction, the site should be leveled, and drainage ditches should be arranged around to prevent the surface from being soft when it rains. Heavy machinery and transport vehicles such as rotary drilling rigs should prevent construction machinery from sinking due to underground ditches and holes under the site.
Rainproof measures for earthwork excavation construction
1 When earthwork and foundation works are carried out in rainy season, all construction units shall properly prepare feasible construction schemes, technical quality measures and safety technical measures, and prepare water pumps before earthwork excavation.
2, the rainy season construction, manual or mechanical digging, must be strictly in accordance with the provisions, slope, slope should be slower than normal construction, more plastic sheets. During the inspection season of the foundation pit, the foundation pit and the slope shall be inspected together, and there shall be no piles and spoil within 3m at the top of the foundation pit. After the foundation pit (trough) is dug, concrete cushion shall be organized in time, and drainage ditches and collecting wells shall be set around the foundation pit to ensure smooth drainage at any time.
3, the construction road from the foundation pit mouth shall not be less than 5 m. ..
4. During the foundation pit construction, always pay attention to the stability of the slope, organize evacuation in time when cracks and landslides are found, and continue the construction after reinforcement measures are taken and confirmed.
5, when the foundation pit excavation, should do small earth embankment along the edge of the foundation pit, and set up a sump or drain around the foundation pit, to prevent surface water from pouring into the foundation pit. Before foundation pit cushion, silt should be removed before construction.
6. In the process of construction, each working procedure such as earth borrowing, earth moving, paving and compaction shall be carried out continuously. Before it rains, the fill layer should be compacted in time and made into a certain slope to eliminate the rain.
Rainproof measures for formwork construction
1, templates stacked on the construction site should be equipped with stow-wood, and the upper part should be rainproof, and there should be no water around.
2, template support foundation should be solid or add good plate, timely check whether the support is firm after the rain; Drain the rainwater in rainy season into the drainage ditch in time to prevent water accumulation in the site.
3, after ripping, template to timely repair and besmear brushs isolation agent.
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