Safe construction plan during rainy season
1. General requirements for construction during the rainy season
? 1. Ensure smooth flow of information
Do a good job in the information management of the project department. Informatization is important for scientific management of enterprises Partly, due to the uncertainty and suddenness of severe weather such as construction storms in spring and summer, it is difficult to predict the extent of damage. It is necessary to strengthen the control and management of meteorological information, take effective safety measures in a timely manner, and strengthen prevention.
?2. Comprehensiveness of protection
The construction site involves a wide range of areas, including the safety protection of various parts of the site and temporary facilities as well as the safety of all workers. Therefore, when formulating safety measures You must be meticulous and thoughtful when doing it, and don't ignore it just because it is small, so as to leave hidden dangers and cause losses.
?3. Scientifically organize construction
When preparing the construction organization design, fully consider the characteristics of construction during the rainy season, and arrange projects that are not suitable for construction in the rainy season in advance or later. Make reasonable arrangements for indoor and outdoor work according to weather conditions, and arrange work indoors as much as possible in windy and rainy weather; do a good job of interleaving processes to improve work efficiency and construction speed; construction should be stopped in case of severe storms.
4. Quickly respond and make emergency preparations for flood control and disaster relief
During construction during rainy periods, various protective measures must be further strengthened, including slope protection of tunnel doors, roadbed slopes, Effective measures have been taken to strengthen the scaffolding, explosive storage warehouses, various protective sheds, temporary facilities, etc. to ensure that emergency and disaster relief supplies are in place, and emergency plans are activated immediately in case of danger.
? 2. Preparation measures for rainy season construction
The project department established a flood prevention and control leading group and established a rainy season duty system. Before the rainy season comes, the construction unit and operation team must establish a rainy season construction leading group, assign responsibilities to each person, and provide guarantees for each person. Regular inspections are carried out during the rainy season construction, and the three-inspection system of "before the rain, during the rain, and after the rain" for rainy season construction is strictly enforced, and any problems discovered are rectified in a timely manner.
?1. Construction preparation
(1) Set up a flood control and rescue commando team to carry out normal construction operations during normal times and flood control and rescue operations when it rains. Each construction site must be equipped with sufficient flood prevention equipment and materials, including raincoats, rain boots, shovels, straw bags, water pumps, etc., so that the personnel and equipment are well-organized, measures are effective and implemented, and special flood prevention and rescue materials are not allowed to be used by anyone at will.
(2) Get in touch with the local meteorological and hydrological department, obtain local weather forecast in a timely manner, and understand recent flood conditions in order to reasonably arrange and guide construction. At the same time, an on-site rainy season duty schedule is formulated, a rainy season duty system is established, and a dedicated person is assigned to listen to the weather forecast every day and keep records. When there are heavy rains or heavy rainstorms, the duty personnel will be notified in a timely manner to prepare for emergencies in advance. A dedicated person is responsible for coordinating flood prevention matters with surrounding departments, enterprises and institutions, so as to achieve both division of labor and cooperation to ensure timely drainage and reduce losses.
(3) Compile rainy season construction operation instructions and formulate flood control and flood prevention plans as mandatory execution documents in rainy season construction and strictly implement them.
(4) During construction during rainy season and flood period, flood prevention and drainage work during the construction period should be carried out according to the local weather forecast and the specific conditions of the construction site.
(5) When constructing across rivers, the installation and removal time of construction plank roads and access roads must be approved by relevant departments to meet the flood discharge capacity. The construction of underwater piers and abutments should be avoided as much as possible during the rainy season.
(6) During construction in the rainy season, accumulated water should be removed from the construction site in time, and inspections of supports, scaffolding foundations and earthworks should be strengthened to prevent tipping and collapse. Take preventive measures for machinery, equipment, materials, etc. in areas that may be submerged by floods, and construction workers must be prepared for safe evacuation. For projects that are operated in the rainy season for a long time, awnings should be erected according to conditions. Construction should be suspended if there is a storm during construction.
(7) When carrying out concrete construction in the rainy season, the moisture content of sand and stone must be detected in time and the mix ratio must be adjusted. Try to avoid concrete construction on rainy days. If it is unavoidable, cover it with a rainproof cloth (shed) to prevent rainwater from washing into the concrete and causing segregation.
(8) On-site medium and small equipment must be equipped with rainproof covers or rainproof sheds according to regulations, mechanical and electrical equipment must be installed with grounding safety devices, and the leakage protection device of the motorized switch box is safe and reliable; construction cables , Bury wires underground as much as possible, and take reliable fixing measures for exposed poles and wires; perform insulation testing on on-site equipment before the rainy season.
(9) Take rain-proof and moisture-proof measures for out-of-service mechanical equipment, steel, cement and other materials, and the storage tables of on-site materials should be elevated to prevent rainwater soaking.
(10) All kinds of permanent and temporary drainage facilities (such as intercepting ditches, drainage ditches, etc.), on-site and off-site construction roads must be planned as a whole, construction should be prioritized, the grade should be improved, the quality should be ensured, and Strengthen the maintenance and renovation of temporary construction access roads to ensure smooth flow during the rainy season.
(11) During the rainy season, assign dedicated personnel to be on duty in dangerous areas, focusing on strengthening the observation of deep foundation pit slopes, and safety inspections of construction across rivers, highways, and railways, and assign dedicated personnel to conduct drainage in the construction area The system is inspected and cleaned to ensure that the drainage system drains smoothly.
?2. Material protection measures in rainy season
(1) The moisture content of sand and stone increases after rain. The concrete mix ratio must be adjusted after re-measurement of the water content of sand and stone. , to ensure the quality of concrete.
(2) The cement is stacked in the rainproof shed, and the bottom is paved with wooden sleepers or square logs and waterproof tarpaulin to prevent moisture.
All materials and machinery should be placed at a higher place. If necessary, tarpaulins should be supported to prevent rain, and water-blocking and drainage facilities should be installed on the ground.
(3) Pay attention to the safety of electricity when laying track in rainy days, and carry out hoisting construction slowly. Rainproof measures shall be taken during the construction of the concrete base and supporting layer and the cement asphalt mortar pouring construction. Prepare enough awnings or plastic films during construction in the rainy season. For unit welding, a tent can be set up on the track to prevent wind and rain, prevent the flux from becoming ineffective when it gets wet, and ensure normal preheating, pouring, etc.
(4) Prepare sufficient flood control and emergency supplies and equipment during the rainy season and flood season. Obey the overall arrangements for local flood control and actively fight floods and rescue emergencies.
3. Guarantee measures for roadbed construction in rainy season
(1) Determine the height of the groundwater level and formulate reasonable diversion and drainage measures. If necessary, add longitudinal seepage ditches outside the slope foot to speed up the drainage of foundation water. exclude. The fillers below the groundwater level should be filled with fillers that have good water stability and strong permeability to facilitate drainage and block the rise of capillary water.
(2) In the rainy season, short sections and fast cycles are used for roadbed construction. When filling the embankment, special attention should be paid to the control of the filler moisture content. If the filler is too wet, it should be dried before use to ensure that the filler Fill in optimal moisture content. When filling embankments, the filler should be dug, transported, laid, leveled and compacted as needed. Each compacted layer during rainy season construction should have an outward drainage cross slope of 4%. After rainy days, the subgrade base surface must be dried and tested before the next construction process can be carried out, otherwise it will be reworked. The embankment slopes must be kept flat at all times without leaving any pits, and the loose soil paved that day must be crushed before the work is completed.
(3) Special attention should be paid to drainage work during foundation replacement and filling construction in the rainy season. The drainage facilities installed can completely exclude surface water and seepage groundwater. Backfilling operations should follow closely the excavation work, and the substrate should not be exposed or soaked in standing water for a long time. Each process of roadbed filling is carried out in a compact manner, with a 2-4% transverse drainage slope on the roadbed surface of each filling layer. Gravel fillers with good water permeability are used for filling, and the fillers must be consistent in the same section and layer. In order to prevent rainwater from carrying away the fine particles in the graded filler, the layer should be covered with raincloth during heavy rain.
(4) During the construction of cuttings, temporary drainage ditches should be constructed in time during excavation. The bottom surface of the excavation should be smooth, there should be no water accumulation, and there should be a longitudinal slope of not less than 4% to the outside. Through the observation of groundwater outcrops during the rainy season, reasonable measures can be taken for diversion. Conduct a comprehensive inspection of cutting construction after heavy rains and heavy rains, investigate the cutting slope diseases caused by the action of water, formulate remedial measures, and record them. After multiple post-rain observations, evaluate whether they are under control. After heavy rain, the flatness of the roadbed surface, the setting of the drainage slope, and the situation of water and soil erosion will be evaluated to further guide the construction.
(5) When excavating soft rock, strongly weathered hard rock and soil cuttings, reserve a base protective layer. Before excavation of the replacement layer, excavate side trenches and provide drainage facilities.
(6) Construction in areas prone to collapse disease should be avoided in the rainy season. The roadbed earthwork and support projects should be coordinated closely. Support project construction should be carried out in a timely manner after excavation, and loose loose soil on the slope should be removed in a timely manner to prevent side slopes. Collapse. Before digging trenches, drainage wells, catenary pillar foundation pits, etc. on the roadbed, waterproof and drainage measures must be taken, and timely backfilling must be done after excavation.
(7) For structures such as roadbed drainage and protection, in addition to paying special attention to the quality of the filter layer, weep holes and settlement joints during the construction process, we also pay close attention to the drainage facilities of the structure during the rainy season. Whether the function can achieve the design purpose. Strengthen the observation of slopes and protective structures in unfavorable areas. Mortar or concrete structures that have not reached a certain strength must not be washed away by rainwater. Especially for drainage structures, covering and temporary drainage measures are generally adopted.
?4. Guarantee measures for bridge construction in rainy season
(1) Do all preventive work in advance, evacuate people, machinery, equipment and materials from the main river in advance before heavy rains come, and Effective protection measures shall be taken for existing branch projects.
(2) The processing of steel bars is carried out in the steel bar shed. During construction on rainy days, the steel frame under construction or that has been tied up and prepared for pouring concrete must be covered with shed cloth or raincloth, and the middle pad should be placed. high to facilitate drainage and prevent rainwater from corroding the steel bars. ?
(3) Fill the tied steel bars with concrete in time to prevent corrosion. Stop working at heights when there is strong wind or heavy rain. Frequently check electrical equipment and circuits, and make rainproof covers to prevent leakage accidents. ?
5. Guarantee measures for tunnel construction in the rainy season?
(1) Special personnel are responsible for flood control and flood relief in the rainy season, and a comprehensive inspection is organized before the rainy season, focusing on temporary construction and construction roads. , drainage system, temporary power supply and other aspects of flood prevention, waterlogging prevention, leakage prevention, lightning protection, etc., and deal with problems promptly to ensure that the temporary construction is safe and stable without leakage, the construction road is solid and smooth without collapse, the drainage facilities are good, and the drainage The ditch is clear and does not accumulate water. ?
(2) Before the tunnel enters the tunnel, a water intercepting ditch at the top of the tunnel and a drainage system at the tunnel entrance should be prepared. ?
(3) A certain amount of flood control and rescue equipment should be prepared at the tunnel entrance to dredge rivers and channels to ensure smooth drainage. After entering the cave, prevent water inrush from flooding the cave, and adopt measures based on local conditions and a combination of blocking and drainage to deal with water inrush from surrounding rocks to avoid large water inrush from flooding the cave. The entire tunnel adopts graded water collection and pipeline drainage, and drainage work is carried out to ensure that there is no accumulation of water at the bottom of the tunnel.
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6. Guarantee measures for concrete construction in the rainy season?
(1) During construction in the rainy season, the sand and gravel storage silo of the mixing station must be covered to prevent the moisture content of the sand and gravel from increasing and affecting the Concrete quality. At the same time, a rainproof shed should be set up at the concrete pouring site to prevent concrete from segregating. In particular, the sand and gravel storage bins and concrete pouring platforms in the beam yard must be equipped with rainproof sheds to ensure the quality of bridge prefabrication. ?
(2) Carry out drainage work at the construction site to ensure the normal drainage capacity of the trench. Drainage machinery and equipment should be complete, and the parking of machinery and the stacking location of materials should be planned. During construction on rainy days, power lines must be reliably grounded to prevent danger caused by lightning strikes.
?7. Other necessary guarantee measures?
(1) During the rainy season construction, do a good job in testing and inspection of the project, strengthen inspection and supervision, and adopt strict self-control measures to ensure construction in the rainy season. quality. ?
(2) Protect various mechanical and electrical equipment from rain, moisture, and leakage during the rainy season, and provide lightning protection facilities. ?
(3) Before and after heavy rains, inspect scaffolding, wind ropes, ground anchors, slopes, foundation pits, temporary houses and facilities, etc.; find tilt, deformation, subsidence, rain leakage, and electricity leakage , or construction areas that may collapse, repair and reinforce them in a timely manner. ?
(4) Necessary flood prevention measures shall be taken for mechanical equipment, materials, etc. in areas that may be flooded by floods. ?
(5) If heavy rain, fog, or strong winds affect the construction of various lifting machinery and equipment, stop the operation and lower the boom to a safe level to avoid danger.