Special construction measures for rainy season construction and flood control?

What are the special construction measures for construction and flood control in rainy season? The following Zhong Da consults the bidding teacher to answer your questions for your reference.

Combined with the actual situation of site construction, measures of blocking, draining and blocking are planned to ensure the smooth construction in flood season. Drainage: hardening the ground around the foundation pit, building drainage ditches and collecting wells to ensure that rainwater can be discharged in time; Sealing: sealing the holes on the first supporting plate to prevent rainwater from flowing into the foundation pit on the first sealing plate; Leak-proof: Strengthen the monitoring of foundation pit and deal with the leaking parts in time.

A, the rain period drainage and measures to prevent foundation pit irrigation

First, in order to prevent a large number of surface water, groundwater, etc. From the infiltration into the foundation pit, the foundation pit is flooded, the slope stability is destroyed and the construction is affected. The measures of combining ground water interception with pit drainage must be taken. Before it rains, clean up the sump and drainage ditch in the pit, prepare pumping tools such as submersible pump, organize manpower and material resources to pump and drain the pit in time after it rains, and dredge the accumulated water around the foundation pit.

B. In case of continuous rain or rainstorm for several days, effective water retaining and drainage measures should be taken on the ground to prevent rainwater from pouring into the foundation pit. Submersible pump is used for foundation pit drainage, and the drainage pipe should be long enough to discharge water from the construction site.

C, planning the site general layout

In rainy season, the construction should be "prevention first", the site general layout should be planned reasonably, and the measures of combining rain protection with enhanced drainage should be taken. Ensure the normal construction and production in rainy season, and minimize the influence of seasonal climate on engineering construction. Before the rainy season comes, improve the overall drainage system of the construction site, set up drainage ditches and collecting wells reasonably, and clean up the drainage outlets to ensure smooth drainage.

Plan the responsibility scope of each flood control and rescue team on the site general plan, and the junction of each team should overlap. If something goes wrong at the intersection, both teams are responsible.

D, increase the frequency of groundwater level observation, timely understand the changes of groundwater level and take corresponding technical measures.

Second, the rain period to strengthen the monitoring of foundation pit

First, mainly monitor the following aspects:

Whether the retaining wall coping concrete has cracks or depressions; Whether there is deformation, crack and displacement of shotcrete for retaining wall; Whether there is water and displacement at the foot of retaining wall.

B, observation should be regularly patrol every day, and make records, in case of danger, immediately report to the competent foreman, and stop the construction work under the breast wall, immediately notify the breast wall construction unit, supervision and construction to be present for processing, and then continue to work until the danger is eliminated. If the drainage ditch outside the capping beam is damaged or blocked, it should be repaired and dredged immediately, and the accumulated water at the foot of the breast wall should be dredged immediately.

C. During the whole construction process, the cracking and deformation of adjacent surfaces and features shall be continuously observed. Under normal circumstances, small cracks on the surface can be regarded as normal, but the development trend must be closely followed and special treatment measures should be taken in time. When the cracks develop and expand rapidly, the original construction process must be stopped, and the supporting parameters and reinforcement should be modified in time.

D, in the process of construction, when the ratio of the lateral displacement at the top of the foundation pit to the excavation depth at that time exceeds 1‰ (or exceeds the calculated displacement of the retaining wall), the support shall be closely observed and reinforcement measures shall be taken in time, and other support methods shall be added when necessary.

Three, the first floor hole and driveway rainproof measures

First, the rainy season construction of post-cast strip

In order to effectively protect the steel bars in the post-cast strip from corrosion and prevent the rainwater collected by the roof from flowing into the basement when it rains, before the rainy season comes, a 240*240mm brick wall is built on both sides of the post-cast strip to block the horizontal platform, and a concrete cover plate is set on it to seal it, and the flat-fell seam between precast slabs is filled and smoothed with cement mortar. The sealing method is as follows:

Schematic diagram of setting horizontal platform and precast cover plate of post-pouring belt block

B, the first floor plate tower crane position, reserved hole construction in the rainy season.

Construction joints should be reserved from the first floor construction to the tower crane position, and the remaining floor can be constructed only after the tower crane is dismantled. Before the rainy season comes, a brick wall with a height of 120*240mm will be built around the lattice column supporting the tower crane to block the horizontal platform, and the open hole will be covered with colored strips of cloth to prevent rainwater from flowing into the basement along the plate holes around the tower crane; A 240*240mm brick wall is built around the reserved hole for equipment hoisting to block the horizontal platform. Because the hole is too big, the steel pipe frame is covered with striped cloth and then compacted with bricks to prevent heavy rain from falling directly and damaging the covered facilities and entering the basement in large quantities.

Masonry of horizontal platform around tower crane

C, the first floor stairs, pipeline construction in the rainy season

There are many holes in the first floor, which can't be closed. In order to prevent a large amount of rainwater from entering the basement in rainy season, rainproof measures should be taken for stairs and pipes leaving the first floor. Stairs and pipes that have been constructed shall be covered with colored strips. Unstructured stairs and pipes should be surrounded by brick walls with a height of 120*240mm, and larger openings should be covered with colored strips.

Rainproof measures for the first floor, stairs and pipes

D, the first floor car, bicycle ramp construction in the rainy season.

Before the rainy season comes, the first-floor car and bicycle ramps should be connected with drainage hoses at the top of each ramp and the bottom of the floor drain at the bottom of the slope. The other end of the drainage hose passes through the reserved holes of floor drains on the underground floors near the location, and finally goes deep into the basement sump to collect rainwater into the sump.

Four, the rainy season construction other special measures

(1) construction survey

Outdoor survey setting-out should not be carried out in rainy days, and construction survey should be carried out after rain. Before the axis is put in, the water in the working area should be cleaned up to make the axis put in clearly and accurately.

Protect the equipment from rain, and maintain the steel ruler and instruments after use to keep them in good condition.

When placing instruments and equipment on steel beams, surveyors must take anti-slip and anti-falling measures for the instruments. It is forbidden to measure in strong winds (above level 6) and heavy rain.

In order to prevent rain erosion, the marking method of control points is changed to paint marking as a "cross" punching mark on steel columns and beams.

(2) Construction machinery management

Tower crane, construction elevator, etc. Lightning protection device shall be installed. Before the rainy season comes, the lightning protection device should be inspected comprehensively, and the grounding resistance should be measured to ensure lightning protection safety. After lightning strike, check that the porcelain insulator, connecting wire and grounding wire of valve arrester are intact.

Electrical equipment used in the open air, such as concrete pump, electric welding machine, cutting machine, electric hoist and other equipment, should build a canopy and park it on a high solid ground.

Small construction machinery should be kept indoors in rainy days.

Decoration construction machinery should be installed in a rain-proof and sand-proof hangar.

All kinds of distribution boxes and switch boxes on the construction site must have rain-proof facilities, which are installed correctly and firmly.

(3) Steel structure engineering

Storage and stacking of materials and equipment

All high-strength bolts, welding wires and covered electrode shall be put into storage to ensure no leakage and moisture. Ventilation should be overhead below, and drainage ditches should be set around to avoid water accumulation.

When oxygen and acetylene cylinders are placed outdoors, rain and sun protection measures should be taken.

In the rainy season, all construction electrical equipment is not allowed to be placed in low-lying places to avoid being soaked by water.

Steel bars should be stored in the open air, and there should be obvious drainage ditches around them to prevent water accumulation. The bottom of steel bars should be padded with wood squares to avoid being soaked by water.

B rainy season construction welding management

Covered electrode should be placed against moisture, rain and smashing. During outdoor welding in rainy season, in order to ensure the welding quality, outdoor welding parts should have a canopy, and welding is not allowed without rainproof measures.

If the electrode is affected by moisture, it should be dried before use.

Porcelain rings for stud welding must be heated in an oven and kept dry before use, and there must be no impurities such as oil and water.

For important welded joints, a fortification canopy or tarpaulin should be set up to protect the weld from the sudden change of temperature when the storm comes, and the operation should be stopped when the relative humidity is greater than 90%.

When welding at high altitude, besides the above rainproof measures, windproof measures must also be taken, and the scaffold must be firmly erected to resist strong winds.

When welding, pay attention to clean up the surrounding flammable materials to avoid fire. When the wind speed is more than 5m/s (manual arc welding) or 2m/s (gas shielded and self-shielded welding), reliable windproof measures must be taken before welding.

High strength bolt structure

The storage of high-strength bolts must be carried out as required, and it is forbidden to unpack them at will to prevent the bolts from being affected with damp.

Strictly follow the design requirements, and do not install and tighten high-strength bolts in rainy days.

The high-strength bolts installed on the same day must be tightened on the same day, and shall not be left overnight to prevent the rain from getting wet and changing the torque coefficient of the high-strength bolts.

Hoisting operation

Cranes, tower cranes, etc. Lightning protection and grounding measures should be taken, and all kinds of rigging used for hoisting should be checked before use.

Clean the parts in time, remove the dirt on the parts, and prevent the parts from hanging into the operation surface with mud.

Check the temporary electrical box and power tools to ensure their good insulation performance, and timely check the safety rope (hemp rope), safety net and other protective facilities after the rain.

fireproof paint

Indoor construction of fire retardant coatings will be carried out as usual in rainy days, but it is necessary to check the sealing condition of holes in the upper floor to prevent rainwater from flowing down the holes and damaging the fire retardant coatings. Before spraying fire retardant paint on the components wet by rain, the rain on the components must be cleaned and dried before construction.

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