What are the seasonal construction measures for the shantytown-to-community project?

Seasonal construction measures for shantytown-renovation community projects are very important. Each measure is formulated for better expected results, and only by focusing on seasonality can we achieve the best results. Zhongda Consulting would like to explain to you the seasonal construction measures for the shantytown-to-community project.

Section 1 Construction Measures during the Rainy Period

From the climate characteristics of Leshan City, it can be seen that the rainy season in Leshan City, Sichuan is mainly concentrated from June to September, with varying degrees of rainfall in other months.

According to the climate characteristics, the key points of construction during the rainy season are:

1. Structural construction

(1) Rebar engineering

1. The steel bars on site should be stacked high to prevent them from being corroded by water.

2. Avoid steel bar welding construction on rainy days. During light rain, measures must be taken at the construction site. Temporary rainproof shelters with plastic sheets can be used to ensure the quality of steel bar welding. In case of heavy rain or strong wind, welding construction must be carried out immediately. Stop construction.

3. In rainy days, steel bars should be rust-proofed as appropriate. It is strictly forbidden to use rusted steel bars on structures.

(2) Formwork Engineering

After the formwork is removed, it should be cleaned in time and applied with release agent. It should be painted again after heavy rain.

(3) Concrete Project

1. Concrete construction should be avoided on rainy days. Concrete shall not be poured during heavy rain or rainstorms, and newly poured concrete shall be covered to prevent rainwater erosion.

2. During the rainy period, the moisture content of sand and stone should be measured at any time, the concrete mix ratio should be adjusted in time, and the water-cement ratio should be strictly controlled. When pouring concrete on rainy days, the slump should be appropriately reduced.

3. If there is a sudden heavy rain or rainstorm and concrete cannot be poured, the construction joints should be set at a reasonable location, the poured concrete should be covered with plastic sheeting, and the accumulated water should be removed after the heavy rain before continuing. pouring.

2. Masonry Project

Since this project is indoor masonry, the rainy season will have little impact on the masonry. In order to ensure the moisture content of shale bricks, pay close attention to weather changes. Reasonably arrange the entry time of shale bricks and try to avoid rainy days. Shale bricks should be transported into the floor as much as possible before it rains. If they are exposed to rain, they should be properly allowed to air-dry before use to reduce the moisture content and ensure the quality of the masonry.

3. Roofing Engineering

(1) The rainy season affects the roof waterproofing construction, so we must pay close attention to weather changes, seize the construction opportunity, avoid construction on rainy days, and do the leveling and leveling in time. Waterproof layer to prevent the insulation layer from containing too much water and affecting the thermal insulation effect. If it encounters rain before waterproofing, the insulation layer or leveling layer should be covered. When construction continues after rain, the insulation layer must be sampled to measure the moisture content. Construction can only be carried out if the moisture content is lower than 9%.

(2) When the weather is rainy, the newly made waterproof layer should be covered with plastic film to prevent the newly made waterproof layer from being washed away.

(3) The roof should be constructed before the rainy season as much as possible, and the downpipes should be installed. If the drainage outlet cannot be installed in time, a layer of membrane should be laid here first.

(4) During waterproofing construction of roof membranes, attention should be paid to checking the dryness of the waterproof base layer. If the moisture content is greater than 9%, the construction of the waterproof layer is prohibited.

IV. Mechanical and electrical construction

(1) Reserve holes for equipment and take rainproof measures. If some underground equipment at the construction site has been installed, measures must be taken to prevent the equipment from getting damp or soaked in water.

(2) Exposed pipes or equipment on site should be covered with plastic sheeting or other rainproof materials.

(3) Outdoor cable intermediate heads and terminal heads should be made in sunny and windless weather. Before making oil-impregnated paper insulated cables, the cable insulation must be shaken and checked for moisture. If moisture is found in the cables, , should be removed segment by segment until there is no moisture.

(4) Electrical wires, pipelines, pipe openings, and pipe connections laid in humid places should be sealed.

5. Scaffolding Project

(1) Since this project uses double-row steel pipe scaffolding, a comprehensive inspection of the scaffolding must be carried out before the rainy season. The base of the scaffolding pole must be firm and a sweeping pole must be added. , External scaffolding must be firmly connected to the wall.

(2) The foundation of the outer frame poles should be solid and should be inspected at any time during rainy periods. If there is any subsidence or deformation, it should be dealt with immediately.

6. On-site drainage measures

(1) The entire on-site road shall be made of concrete hardened ground, and a circulation road and drainage slope shall be set up in the on-site area. Drainage ditches and water collection wells are set up on the circulation roads, and the drainage ditches are connected to the municipal pipe network through sedimentation tanks to ensure that rainwater can be drained into the municipal pipe network in a timely manner.

(2) Temporary roof drainage

For roofs that have not yet been waterproofed before the rainy season, it is planned to temporarily adopt temporary drainage measures, that is, use roof rainwater pipes for temporary drainage. The rainwater outlet is sealed with polystyrene boards around it, and the top of the rainwater outlet is sealed with wire mesh to prevent debris from entering the rainwater pipe and causing blockage. Some other roof pipes are surrounded by red bricks with a 200mm high water retaining sill.

Section 2 Safe and Civilized Construction Measures during the Rainy Period

1. Organize construction personnel, safety officers, and technicians on site to conduct rainy season safety inspections on site before the rainy season, and deal with any problems found in a timely manner. And conduct regular inspections during construction during rainy periods.

2. Designate a dedicated person to check the slope conditions of the foundation pit, especially the slopes near the material storage yard. If there are signs of possible landslides such as slope cracks or inclination, effective measures must be taken promptly.

3. Construction on exterior scaffolding should be stopped on rainy days. After heavy rain, roads, exterior scaffolding, etc. should be fully inspected to confirm that there is no subsidence or looseness before use.

4. During the rainy season, always check whether the grounding and zero-connection protection devices of on-site electrical equipment are sensitive. When using electrical equipment and power tools used in daily life during the rainy season, double protection measures (leakage protection and insulated labor protection tools) should be adopted. Please pay attention to Check whether the wire insulation is good and whether the connectors are well wrapped. Do not soak the wires in water.

5. Lightning protection and grounding of tower cranes and other equipment should be done well, and attention should be paid to comprehensive inspections. All subsequent indicators should comply with safety regulations, and inspection records should be kept.

6. Tower crane operators must check whether the fuselage is charged before work, whether the leakage device is sensitive, and whether the various control mechanisms are flexible, safe and reliable.

7. When getting off work every day, the tower crane arm should be stopped in the downwind direction, release the slewing brake device; retract the hook to the uppermost end of the boom, and drive the trolley to the root of the boom. If the boom interferes with obstacles during the rotation process, the tower crane hook must be fixed on the ground anchor; the cab doors and windows must be closed, the rail clamps should be tightened, and the power switch in the distribution box must be cut off and the box must be closed. The door is well locked. In the event of severe weather such as heavy rain or strong winds above level 6, tower crane lifting and open-air operations should be stopped.

8. Motor vehicles driving during rainy periods should pay attention to anti-skid and have stop devices when unloading materials next to the foundation pit.

9. Tower crane disassembly and assembly operations are not allowed within 4 hours after heavy rain. In case of special circumstances, special safety technical explanations must be made.

10. Vehicles entering and exiting the construction site should be kept clean and soil should not be taken out of the construction site to pollute municipal roads.

11. The rainy season is right in the middle of the summer and the weather is sultry. You should adjust your work and rest schedule appropriately to avoid high temperatures at noon; the logistics department should take necessary heatstroke prevention and cooling measures, such as sunshade, and distributing heat-relieving medicines and cooling drinks. Or drink water and add heatstroke prevention medicines, etc., to do a good job in preventing heatstroke and cooling down the construction workers.

12. Ensure that the site is clean and tidy to prevent mosquitoes and flies from breeding and avoid the occurrence of infectious diseases. For this reason, offices, dormitories, canteens, toilets and other places should be sprayed and disinfected regularly.

Section 3 Summer Construction Measures

In the hot summer, work should be done to prevent heatstroke and cool down. A tea supply station should be set up on the construction site; the food should be hygienic and delicious to ensure the health of employees.

During construction in high-temperature seasons, concrete pouring should be avoided during high-temperature hours in the sun. When continuous construction is required, cooling measures such as watering and covering the formwork and delivery pumps should be taken.

When testing the proportion of concrete, hot weather conditions should be taken into consideration, such as adding retarder to delay the solidification of concrete and reduce slump loss, etc.

Assign a special person to be responsible for the maintenance of concrete, and use watering and water storage to maintain the concrete surface in a moist state to prevent cracking.

Section 4 Winter Construction Measures

According to the construction period of this project, the winter in Leshan area is December, January, and February, although the temperature in winter is not too low all year round. High, the winter does not last long, but in recent years the winter temperature has been abnormal. In order to ensure that the project can be carried out normally during the winter, the following measures are taken:

1. Determine the winter concrete construction mix ratio, and follow the It is required to add antifreeze agent to improve the frost resistance of concrete. The mixing station has reliable winter construction guarantee measures to ensure the requirements for concrete construction in winter.

2. Ensure that the concrete reaches the critical strength before freezing. When removing the formwork, the concrete strength must reach 4Mpa. The removal time shall be based on the compressive strength of the test block under the same conditions on site.

3. Prolong the curing time appropriately, and remove the formwork after the concrete reaches sufficient strength.

4. Control the exit temperature of the concrete mixture to ensure that the concrete entering mold temperature is not lower than 5℃. To prevent the concrete from freezing or the temperature dropping too quickly during transportation. There should be no frozen lumps in the mixing mortar materials. When the weather is freezing, the materials should be covered with plastic films and straw bags.

5. Before pouring concrete, the ice and snow on the formwork and steel bars should be removed. When pouring with a ground pump, the concrete pump pipe should be wrapped with an insulation quilt (layer).

6. Establish a winter construction temperature measurement system. During concrete pouring, temperature measurement holes should be arranged and numbered as required, and temperature measurement work should be carried out according to winter construction requirements. A dedicated person will be assigned to take charge of the temperature measurement. The temperature measurement will be done every 2 hours before the concrete strength reaches 3.5N/mm2, and then every 6 hours thereafter. All measurement and inspection results should be filled in "Concrete Construction Record" and "Concrete Winter Construction Diary".

7. When welding steel bars under negative temperature conditions, wind-shielding facilities should be set up and the heat preservation time should be appropriately extended according to the prevailing temperature conditions. Welding work is prohibited during heavy rain.

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