How to construct in rainy season-14 Key points of rainy season construction

How to construct in rainy season-14 Key points of rainy season construction

The rainy season will bring many unfavorable factors to the construction of building projects, but in order to ensure the construction period, it is usually impossible to stop construction in the rainy season, so it is particularly important to master the technical points of rainy season construction. Below, I will share with you the key points of rainy season construction. Come and have a look!

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1 Around the foundation pit and pipe trench to be excavated, water retaining dikes or earth dikes shall be built to prevent surface water from flowing into the pit and pipe trench; Low-lying areas that are prone to water accumulation and cannot be drained naturally should be filled to avoid water accumulation affecting the construction.

2 During earthwork excavation of foundation pit in rainy season, in order to ensure the stability of foundation pit slope, earthwork or other heavy objects shall not be piled up within the range of 1m from the foundation pit or within the range specified in the design, and the stability of the slope shall be observed at any time, and measures shall be taken immediately when problems are found to ensure the construction safety.

3 During the construction in the rain period, we should pay close attention to the weather forecast, and the excavation surface should not be too large, so the construction should be carried out by stages or in layers and pieces.

4 When the foundation pit is excavated to the bottom, it is necessary to reserve 150mm thick soil layer. Immediately after excavation, drill holes for inspection, and then clean them up before pouring cushion to prevent rain from soaking the groove.

5 During excavation of foundation pit and foundation trench earthwork in rainy season, landslide or collapse is easy to occur due to the high water content of soil, so the slope gradient should be appropriately increased or the safety of slope protection should be increased.

6. The excavation width at the bottom of the foundation pit and foundation trench should not only meet the design size, but also consider the position of the drainage ditch and the width of the working surface. Due to the difficulty of construction in rainy season, the width of the working face should be appropriately increased.

stemming operation

1 After foundation construction, the accumulated water should be drained as soon as possible, the silted mud and sand should be removed, and the backfill soil should be filled as soon as possible.

2 foundation pit backfill should be carried out continuously and completed as soon as possible. Pay attention to rain protection during construction. Before it rains, the fill layer should be compacted in time to make it have a certain slope, which is beneficial to the drainage of rainwater.

3 During earthwork backfilling construction in the rain period, the moisture content of backfill soil should be strictly controlled, and sampling tests should be conducted in time to control the moisture content of backfill soil within the design requirements. If the water content is high, measures such as scarifying, airing or evenly mixing dry soil can be adopted; When necessary, cover the soil source in advance to avoid rubber soil.

4 when the backfill soil is soaked by rain or appears? Rubber soil? When, should be dug out to dry and backfill.

Field drainage

1 The ground of the site is hardened with concrete or paved with concrete square bricks, and the roadside is set at 200㎜. 300㎜ plastering the inside of the drainage ditch, and the bottom of the ditch is not less than 5? The slope of running water. The rainwater is discharged into the municipal rainwater pipe network in an organized way to prevent the surface water from infiltrating into the soil layer and affecting the slope stability.

2 The storage site of various components and machines and the production site of on-site steel and wood processing and prefabricated components should be overhead without water accumulation.

If there is water between the tower foundation and the building, a drainage pipe should be added to prevent the tower gene from sinking.

Construction load

Before the rainy season comes, the existing temporary construction roads on the site should be leveled and paved, so that the road surface is solid and smooth, without subsidence, water accumulation, slippage and bumps.

Rain-proof drainage of foundation pit

1 The net masonry size at the corner of foundation pit (outside the cushion range) is 500mm? 500mm？ 500mm sump shall be plastered on the inside, and the basement operation shall be set at 2? Slope of running water, it is forbidden to pile up materials and sundries on the operation surface to affect the smooth drainage. When it rains, it is equipped with a water pump to drain the sump (two for standby) and discharge the water into the ground drain.

2. The accumulated water in the foundation pit is discharged into the sump, and then pumped into the ground drainage ditch by the pump.

Reinforcement engineering

1 The processed steel bars shall be covered with plastic sheets to prevent the steel bars from being corroded by rain. Stacked steel bars should be padded with wood squares, and the terrain should be higher than the surrounding ground to prevent steel bars from being soaked in water and soil pollution.

2 approach of reinforcement should be neatly stacked, covered with plastic sheets to protect when it rains. Make full use of rainless weather to process steel bars.

concrete work

1 The concrete mixing station is equipped with a rain shelter. The water content of sand and gravel should be measured in time, and the amount of sand, stone and water in concrete should be adjusted according to the measurement results. Bulk cement tanks shall not leak rain. If bulk cement is used, attention should be paid to covering. Cement soaked by rain and deteriorated due to moisture shall not be used.

2 Before concrete pouring, we should know the weather forecast in time and try our best to organize the construction in non-rainy days. In case of rain during concrete pouring, cover it with plastic sheets or ponchos in case of emergency. When concrete must be poured due to busy work, scaffolding and covering measures should be taken, and construction joints should be set reasonably.

3 after the rain, the loose concrete at the joints should be chiseled away, and the concrete should be treated as construction joints when it continues to be poured.

4 after concrete pouring, the initial setting is not reached. In case of rain, it should be covered with plastic sheets in time to prevent rain.

7.5 If the poured concrete is washed or soaked by rain before the final set, so that its surface is damaged, this part of concrete shall be smashed to the dense layer in time, and then repaired.

modification works

1 exterior wall decoration construction should try to avoid the rainy season, or according to the local weather forecast, grab the weather and pay close attention to the construction.

2 when the exterior wall is decorated, it should be covered in time to prevent it from raining. If the decoration surface is damaged by rain, it will be reworked.

3 indoor painting, painting and other decorative construction should be carried out after the installation of roof partition and external window glass.

lifting and erecting engineering

1 tower crane shall be inspected in time after rainy days, and foundation settlement shall be observed and recorded. If there is any settlement, it should be dealt with immediately to ensure the safety of tower crane when it is used.

2. In case of heavy rain, rainstorm and strong wind, the hoisting operation should be stopped.

3 aerial work personnel should pay attention to anti-skid, wear rubber shoes, and are not allowed to wear hard shoes for aerial work.

4 tower crane should measure the grounding resistance, and its resistance value is not more than 4 ohms.

5. Dig 200mm around the tower crane foundation? 300mm drainage ditch is connected with the temporary drainage ditch on site, and the inside is plastered. Set 5 at the bottom of the ditch? The slope of running water. Four settlement observation points are set on the tower foundation, and settlement observation and post-rain settlement observation are carried out regularly to deal with problems in time.

electromechanical device

Before the rainy season comes, we must take measures such as rain, flood, moisture, mildew, rust, leakage and lightning protection. Manage and use the mechanical and electrical equipment on the construction site to ensure the smooth completion of the construction task. On-site machinery management personnel should strengthen the maintenance and repair of machinery and equipment in the rain period, and strengthen inspections. Once the hidden danger of mechanical operation is found, it should be dealt with immediately to prevent accidents. Do someone on duty day and night, and strictly shift system;

1 Large electromechanical equipment placed in the open air should be waterproof and moistureproof, and its mechanical bolts and bearings should be oiled and rotated frequently to prevent corrosion. All mechanical and electrical equipment should be equipped with leakage protectors.

Mechanical and electrical equipment (butt welder, chainsaw, planer, etc.). ) If the construction site is relatively fixed, a fortification canopy or motor protective cover shall be erected; Plastic sheets are not allowed).

For transformers, the grounding resistance value of lightning arrester must be re-tested (the resistance value is greater than 4 ohms), and those that do not meet the requirements must be handled in time. Lightning arresters should be tested in a preventive way.

The installation of mechanical and electrical equipment and the erection of electrical lines must be carried out in strict accordance with the temporary electricity consumption plan and measures.

5. All kinds of electrical switches of mechanical and electrical equipment should have rain-proof and moisture-proof facilities.

After the rain, patrol and inspect all kinds of mechanical and electrical equipment, temporary lines, external scaffolding, etc. Whether there are signs of inclination, deformation, subsidence and leakage. , should immediately mark the danger warning, and timely maintenance and reinforcement. If there is serious danger, stop working immediately.

7 mechanical and electrical equipment (such as rammer, concrete vibrator, etc.). ) If the construction site moves frequently, it should be put back to the site warehouse or stamped with rain protection after use, and it should not be placed in the open air in the rain or put in the into the pit to prevent the rain from drowning.

8 shell, handle, load line, plug, switch, etc. Hand-held electric tools must be in good condition. Before use, they should be inspected with no load, and they can only be used after normal operation.

9 Outdoor personnel engaged in steel bar welding, frog hammer and concrete vibrator operation must wear insulating gloves and shoes.

water proofing work

1 Waterproof works should not be arranged in rainy season. Should be avoided as much as possible. When it rains, waterproof construction should be stopped and the constructed parts should be covered with plastic sheets. After the rain, it is found that the waterproof layer is damaged by rain, so it should be reworked.

During the rainy season, waterproof construction should always pay attention to the recent local weather forecast and use fine weather for construction.

3 In the process of slope construction or before the waterproof layer is completed, rainy days (including rainy days) must be covered with plastic sheets; After the rain, it is found that the waterproof layer is damaged by rain, so it should be reworked.

Mortar mixing

1 Cement should be stored in the warehouse. Inside the warehouse, a brick ridge wall 300 mm higher than the outdoor ground should be built. The wall should be paved with scaffolding and linoleum to prevent cement from being affected with damp. Effective maintenance should be carried out around the cement silo, and drainage ditches should be dug to prevent rainwater from flowing into the warehouse.

2 Sand yard should have good drainage measures to prevent soil from flowing into the sand yard when it rains.

3 mortar mixing should be concentrated, the mixing station should set up a fortification canopy, and the vehicles transporting mortar should be rain-proof to prevent rainwater from entering the mortar.

Shelf engineering

1 During the rainy season construction, special attention shall be paid to the quality and safety requirements of shelf erection, and regular inspection shall be conducted, and any problems found shall be rectified in time.

2. The ground for erection of shelves shall be compacted and drainage shall be paid attention to. The lower end of the vertical pole is padded with long boards, and the shelf is provided with sweeping poles, diagonal braces and scissors, which are firmly connected with the building.

3. Master cheng yen path slope should be appropriate, anti-skid strips should be nailed, and the spacing between anti-skid strips should not be greater than 300mm, and people should be sent to regularly clean up the accumulated mud on the path.

4 Workers working high above the ground after rain should wear rubber-soled shoes and pay attention to anti-skid.

5 During the rainy season construction, special personnel shall be arranged to inspect and maintain the shelf project, especially the ground is easy to sink after the rain, so as to prevent the shelf from sinking and ensure the safe use.

Masonry engineering

1 Blocks (bricks) should be protected from being too wet or soaked by rain. When it rains, blocks (bricks) should be covered with plastic sheets, and blocks (bricks) with high water content should be properly dried before use.

2 when laying, if the mortar flows along the wall, it means that the water content of the block (brick) is saturated, so dry brick and wet brick should be chosen for laying, or mortar with smaller consistency should be used.

3 Before the rain, the newly-built wall should be covered in time to prevent the masonry mortar from being washed away by the rain. If it is found that masonry mortar is seriously washed by rain after rain, it should be demolished and rebuilt.

4 build by laying bricks or stones wall in rainy season, mortar is easy to flow. If we don't pay attention to the correction, it will not only affect the cleanliness of the wall, but also easily lead to quality problems such as wall inclination, uneven thickness of mortar joint and uneven horizontal mortar joint, which must be corrected in time.

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