Why is it to spray dust on construction sites?

It is for dust protection.

Under the action of a certain water pressure, the water mist nozzle splits the water flow into water droplets less than 1mm, and the water droplets can absorb the dust of the construction site.

If cultural relics or ancient tombs are found during the construction, they should be properly protected, and should be reported to the relevant local departments in time before the construction can be continued. If permanent stakes for surveying or long-term observation points set up by geological and ** departments are found, they should be protected.

When laying earthwork construction in the section with above-ground or underground pipelines and cables, the written consent of the relevant management departments should be obtained in advance, and measures should be taken during the construction to prevent damage to the pipelines, prevent landslides, and avoid serious accidents caused by excavation.

When excavating earthworks, it is necessary to prevent subsidence and deformation of adjacent buildings or structures, roads, pipelines, etc. If necessary, it should consult with the design unit or construction unit, take protective measures, and observe the settlement or displacement during construction.

There will be a large amount of construction dust and secondary pollution during the use of the construction site, and the environmental department has requirements for the prevention and control of the construction site.

Spray dust reduction is one of the dust reduction methods, it is the use of high-pressure plunger pump to increase the tap water to 50kg-60kg pressure, the pressurized water through the high-pressure resistant conveying pipeline by the high-pressure atomization nozzle atomization to atomize it, the production of micro-mist particles, the diameter of the droplets is about 10-20 m, so that it can quickly absorb heat from the air, complete gasification and diffusion, attach the condensation of suspended dust in the air, so that it falls to the ground, so as to achieve the purpose of spray dust removal and air purification.

The dust mist gun uses the principle of high pressure to spray water in the form of a fine water mist and deliver it to the place where the dust rises and floats. The fine water mist adheres to the dust particles in the air, and the moist particles continue to adhere to it, so that the particles with a certain weight fall to the ground under the action of gravity, so as to achieve the purpose of dust reduction.

The types of dust and fog cannons include fixed dust and fog cannons, mobile dust and fog cannons, tower dust and fog cannons, multi-functional dust suppression vehicles, etc. There are many dust fog guns used in general construction sites, such as mobile dust fog guns, multi-functional dust suppression vehicles, etc.

The gun of the multi-functional dust suppression vehicle can spray fine water mist, and its bottom nozzle can also spray fine water mist near the ground. However, the multi-functional dust suppression vehicle is large in size and small in flexibility, and is suitable for large-scale construction sites.

Bian Xiao of Huali Electromechanical learned that at the project site of Country Garden Tianqin Garden in Zhengzhou, Henan, there are several dust reduction fog guns to prepare for spraying water mist and controlling dust.

Then the leadership put forward three requirements for the construction project:

The first is to speed up the progress of construction. It is necessary to clarify the time node and make every effort to do a good job in earthwork removal at the construction site.

The second is to strengthen service guarantees. The office should work closely with the project unit to track the whole process and promote cooperation.

Third, do a good job in dust control and management on the construction site. Intensify continuous management, reasonably set up fog cannon machines, external spray systems and other equipment, and fight the battle of atmospheric dust reduction.

For small construction sites, mobile dust collector fog guns can show great power.

Construction site spray dust reduction series products is a new generation of independent research and development of multi-functional spray dust reduction equipment, the use of two types of special chassis modification, with safe and reliable operation, water mist range, small water consumption and other characteristics, the model spray system is suitable for urban street haze control, open-air coal storage, coke, sand, stone and other industrial and mining enterprises yard spray dust suppression, construction sites, housing demolition and reconstruction sites, site leveling sites and other spray dust reduction, public places, green garden spraying sterilization and disinfection; The water cannon for front washing, rear sprinkling and rear operation is suitable for urban road environmental protection dust reduction, road cleaning, and billboard cleaning and environmental protection operations. The left and right greening watering devices can be used for the watering operation of the highway green belt.

Dust control from construction and demolition, unloading and transportation of construction waste or waste residue, local dust control from mechanical operations, and road dust pollution control in heavy-duty vehicle transportation; Dust reduction, moisturizing, cooling and disinfection in hot places; Airports, schools, highways, stations, docks, public places, and sports venues are sprayed to reduce dust and cool down.

Stockpile: open-pit mining, open-pit stockpiling yard, coal gathering station, power plant coal yard, coking plant, truck unloading port, coastal port shipment, transshipment coal, open-pit or closed unloading area, ore, bulk powder handling and other dust pollution control;

forest protection, urban landscaping, street trees and other tall trees spraying to control pests and diseases;

Summary. The dust spraying method at the construction site is as follows:

When using advanced welding equipment of hot melt machine, we will first send skilled welders to strictly implement the welding process parameters and welding process specified in the work instructions to ensure the quality of the weld and reduce the welding deformation.

The connecting end of the connector should extend out of the welding machine fixture for a certain free length, and straighten the two corresponding parts to be connected, so that they are on the same axis, and the dirt on the connecting surface of the pipe, pipe fitting and pipe accessories should be wiped with a clean cotton cloth, and the connecting surface should be milled to make it perpendicular to the axis.

The section surface of the part to be connected should be heated with a hot melt butt connection tool.

After heating, the connecting parts should be quickly separated from the heating tool, check the uniformity of the heating surface melting of the connecting parts and whether there is damage, and then make the connecting surface completely contact with uniform external force, and flange to form a uniform flange, and the height and width of the flange should comply with the relevant regulations.

Calculated from the tower crane body, every 3 meters is provided with a positive tee, the outlet is downward, and the nozzle is installed at the outlet, and a total of 20 nozzles are set.

Process principle: The sprinkler system includes a vertical pipe attached to the tower crane body, a horizontal water supply pipe attached to the crane arm, a water supply system, a control distribution box, pipe fittings, sprinkler heads, etc.

How to do dust spraying on construction sites.

The dust-proof spraying method of the construction site is as follows: when using the advanced welding equipment of the hot melt machine, the welders with excellent skills are sent first to strictly implement the welding process parameters and welding process specified in the work instructions to ensure the quality of the weld and reduce the welding deformation. The connecting end of the connector should extend out of the welding machine fixture for a certain free length, and straighten the two corresponding parts to be connected, so that they are on the same axis, and the dirt on the connecting surface of the pipe, pipe fitting and pipe accessories should be wiped with a clean cotton cloth, and the connecting surface should be milled to make it perpendicular to the axis.

The section surface of the part to be connected should be heated by hot melt to the connecting tool. After heating, the connecting parts should be quickly separated from the heating tool, check the uniformity of the heating surface melting of the connecting parts and whether there is damage, and then use uniform external force to make the connecting surface complete and return to full contact, and flange to form a uniform flange, the height and width of the flange should comply with the relevant regulations. Calculated from the tower crane body, every 3 meters is provided with a positive tee, the outlet is downward, and the nozzle is installed at the outlet, with a total of 20 nozzles.

Process principle: The sprinkler system includes a vertical pipe attached to the tower crane body, a horizontal water supply pipe attached to the crane arm, a water supply system, a control distribution box, pipe fittings, sprinkler heads, etc.

Tap water to supplement the water source, through the call through the dry hand pipe into the horizontal pipe high-pressure water supply, sprayed by the sprinkler head downwards spray mist water, the dust of the construction site is the solid particles floating in the air, high-pressure spray dust reduction is an ideal, low cost of dust reduction, the system working medium is water, in the process of system operation, liquid water from the atmospheric pressure state, through the pressurized pipeline to the atomization nozzle, the liquid water atomization, water mist does not chain movement and dust particles inertial collision, gravity settlement, The combination of interception and dust capture and diffusion capture achieves the purpose of dust reduction.

The arrangement method of the sprinkler facilities set up at the construction site enclosure:

1, the construction site of the main road section of the urban area should be set up with a closed enclosure of not less than the height.

2, the construction site of the general road section should be set up with a closed enclosure of not less than the height.

3. The distance between the sprinkler head and the wall should not be less than 75mm and should not be greater than 150mm.

4. The enclosure should be firm, stable, neat and beautiful.

I've seen a bucket on top of a trolley, a bucket on top of the bucket and an eye on the cart, and a measure of workers underneath the cart and spill the water when the cart goes.

<> dust reduction measures on the construction site are very important, the impact of dust on the construction site is not only the health of the construction personnel, but also the construction efficiency and quality, and the treatment of every detail is very important. Zhongda Consulting will introduce to you the dust reduction measures at the construction site.

1. Carry out hardening treatment on the on-site road, arrange a special person to be responsible for the on-site sprinkling work, and stipulate that the water is sprinkled three times a day in summer and twice a day in winter, and no water accumulation is required. In case of rain, stop sprinkling and clean up the stagnant water on the site.

2. Construction garbage must be transported to the garbage station in woven bags, and it is strictly forbidden to use the elevator shaft or throw garbage on the floor to the ground.

3. Cement and other fine-grained bulk materials that are easy to fly should be arranged to be stored in the warehouse or tightly covered. During transportation and loading and unloading, it is necessary to prevent spillage and flying.

4. When transporting cement and other fine-grained bulk materials and construction residue that are easy to fly, they must be closed, bandaged, covered, and must not leak or spill along the way.

5. A special person should be set up at the construction site to manage the transportation of vehicles and materials to prevent spillage. Before the earthwork transport vehicle drives out of the scene, the earthwork must be photographed, and the vehicle groove and wheels must be washed clean to prevent mud from being on the road and spilling.

6. For cleaning and decorating small machines and mortar mixers, the dust generated by the use of water should be sprinkled with water and dust reduction.

7. Enclose the construction site.

The principle of dust suppression sprayer:

1) Under normal circumstances, the manpower-driven sprayer relies on hydraulic power, that is, hydraulic pressure, and pumps the liquid out through hydraulic pressure.

2) The pneumatic sprayer relies on the action of air flow to spray, and can carry out low and micro spraying. Compared with the hydraulic sprayer, the uniformity of the droplets is better, and the droplets are smaller, and the drift or targeted spraying can be carried out.

Spray dust reduction technology is a very common technology, the use is also very extensive, Guangdong Fenghua environmental protection equipment has a lot of the use of spray dust reduction technology to work, spray dust reduction is a new type of dust reduction technology, the principle is the use of spray particles due to its very small, the surface tension is basically zero, sprayed into the air can quickly adsorb various sizes of dust particles in the air, the formation of effective dust control.

3) Centrifugal sprayer is a spraying instrument that uses the centrifugal force when the centrifugal nozzle rotates at high speed to disperse or atomize the liquid medicine. The size of the sprayed droplets is relatively uniform, the droplet diameter is adjustable, the centrifugal nozzle speed is high, and the droplets are small. It can spray pesticides with high viscosity.

Can be used for both ultra-low volume sprays and low volume sprays.

The sprinkler spray gun spray dust prevention system is mainly composed of water source system, automatic control system, pipeline system, spray gun nozzle, control solenoid valve and protective equipment.

1. Considering that the sprinkler spray gun installed in the site will affect the stacking and reclaiming operation, the sprinkler spray gun is installed around the yard as much as possible, and most of them are arranged in a rectangular and triangular way on both sides of the yard, in which the triangle arrangement can be more evenly covered, and there is a situation that the spray gun is only allowed to be arranged on one side on the spot, and the next step is to select the sprinkler spray gun model according to the requirements of the on-site range.

2. After the model of the spray gun is selected, the operating flow and pressure of the spray gun are checked according to the performance parameter table, and the water pump and water supply pipeline are designed according to this data and the number of spray guns running at the same time (usually only 1-4 guns are running at the same time, and the work is carried out in groups and in turns).

3. Regarding control, it is recommended to use an automatic control system to centrally control the spray gun and water pump, which can greatly reduce the work intensity, save water and electricity and achieve the best dust prevention and dust reduction effect through scientific and reasonable arrangement of spraying procedures. When arranging the spray program, on the one hand, it is necessary to control the spray gun reasonably in groups to avoid excessive head loss of branch pipelines, and on the other hand, it is necessary to pay attention to the season and climate change, and master the principle of a small number of times.