CN113477000B

CN113477000B - Environment-friendly dust falling treatment method and device for raised dust in construction site

Info

Publication number: CN113477000B
Application number: CN202110816442.3A
Authority: CN
Inventors: 刘华山; 孙宁; 倪鸿祥; 刘冬; 陈红洋; 陈广飞
Original assignee: Jiangsu Port Construction Group Co ltd
Current assignee: Jiangsu Port Construction Group Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-06-21
Anticipated expiration: 2041-07-20
Also published as: CN113477000A

Abstract

The invention relates to a building construction site raise dust environmental protection dust fall processing method and device, relate to the raise dust and process the technical field, including, step S1, choose any minor face of rectangular foundation ditch to be excavated and filled to dig out and put the hole, and put the dust fall processing unit into putting the hole; step S2, arranging a dust detector at one side of the rectangular foundation pit to be excavated and filled, which is far away from the dust-fall processing device; step S3, controlling the dust fall processing device to fall dust according to the dust PM value detected by the dust detector in real time; when the upper digging and filling layer area is subjected to dust fall, the controller controls the spray heads to carry out dust fall on the upper digging and filling layer area according to the detected dust PM value A, different second push rod rising heights are set to control the spraying angles of the spray heads, and meanwhile, the controller adjusts the set second push rod rising heights according to the acquired wind speed V. The invention effectively improves the dust suppression efficiency of the raise dust on the construction site.

Description

Environment-friendly dust falling treatment method and device for raised dust in construction site

Technical Field

The invention relates to the technical field of dust emission treatment, in particular to a dust emission environment-friendly dust reduction treatment method and device for a building construction site.

Background

With the acceleration of economic development and urbanization process, the engineering construction amount is gradually increased, and the raise dust generated by building construction is continuously increased, so that the raise dust becomes one of the main pollution sources of urban air.

Most of building engineering have deeper foundation pits, and a large amount of excavation and filling soil exists in the stages of piling, earthwork and foundation construction in a construction site, so that a large amount of earthwork is exposed for a long time, a large amount of raised dust can be formed under the action of external force such as wind power, manpower, motor vehicles and the like, and if dust control measures are not in place, an 'open raised dust source' is formed.

Among the prior art, when carrying out the foundation ditch and dig and fill, the mode that mostly adopts to sprinkle to the job site is with reducing the raise dust, because can't accurate carry out real time control to the root cause of raise dust, leads to pressing down the dirt inefficiency and spill on a large scale and cause the water waste.

Disclosure of Invention

Therefore, the invention provides an environment-friendly dust suppression method and device for raised dust in a building construction site, which are used for solving the problem of low dust suppression efficiency caused by the fact that raised dust sources cannot be accurately suppressed in real time in the prior art.

In order to achieve the above objects, in one aspect, the present invention provides a method for treating dust in a building construction site in an environment-friendly manner, comprising,

step S1, selecting any short side of a rectangular foundation pit to be excavated and filled to dig a placement pit, and placing a dust-settling treatment device into the placement pit, wherein the rectangular foundation pit to be excavated and filled comprises the placement pit and an excavation and filling area, and the excavation and filling area is uniformly divided into an excavation and filling upper layer area, an excavation and filling middle layer area and an excavation and filling lower layer area according to the depth;

step S2, arranging a dust detector at one side of the rectangular foundation pit to be excavated and filled, which is far away from the dust-fall processing device;

step S3, controlling the dust fall processing device to fall dust according to the dust PM value detected by the dust detector in real time, wherein the dust fall process comprises that the controller controls the rising heights of the first push rod and the second push rod to control the spraying height and the spraying angle, the controller controls the movement speed of the second push rod to expand the spraying range, the controller controls the opening degrees of the first spray head, the second spray head and the third spray head to control the spraying amount, and the controller controls the water pumping flow of the water pump to control the spraying strength;

in the step S3, when performing dust suppression on the excavated and filled upper layer area, the controller controls each spray head to perform dust suppression on the excavated and filled upper layer area according to the detected dust PM value a, sets different second push rod lifting heights to control the spraying angles of the spray heads, and simultaneously, adjusts the set second push rod lifting height according to the obtained wind speed V;

when the excavation and filling middle layer area is subjected to dust fall, the controller controls each spray head to perform dust fall on the excavation and filling middle layer area according to the detected raised dust PM value A, different water pump flow rates are set on the basis of data of the excavation and filling upper layer area to control the spraying amount of the spray head, and meanwhile, the controller corrects the set water pump flow rates according to the obtained air temperature T;

when the excavation and filling lower layer area is subjected to dust fall, the controller controls the spray heads to perform dust fall on the excavation and filling lower layer area according to the detected dust rising PM value A, different second push rod speeds are set on the basis of data of the excavation and filling middle layer area to control the spraying range of the spray heads, and meanwhile, the controller compensates the set second push rod speeds according to the obtained air humidity Q.

Further, in the step S3, when performing dust suppression on the excavation and filling upper layer area, the controller compares the detected raise dust PM value a with each preset upper layer raise dust PM value, and controls each spray head to perform dust suppression according to the comparison result, wherein,

when A is less than Aa1, the controller judges that the raised dust meets the requirement and does not fall the dust;

when A is more than or equal to Aa1 and is less than Aa2, the controller controls the first push rod to ascend to a height H1, controls the second push rod to ascend to a height G1, controls the first spray head and the third spray head to be opened by half, and controls the water pump to pump water at a flow rate B1 so as to perform dust fall on the upper digging and filling layer;

when Aa2 is not more than A, the controller controls the first push rod to rise to a height H1, controls the second push rod to rise to a height G2, sets G2 ═ G1 × [1+ (A-Aa2)/Aa2], controls all the spray heads to be completely opened, and controls a water pump to pump water at a flow rate B1 so as to perform dust fall on the upper digging and filling layer;

the device comprises a base, a first push rod, a second push rod, a first water pumping flow and a second water pumping flow, wherein Aa1 is a first preset upper layer dust PM value, Aa2 is a second preset upper layer dust PM value, Aa1 is smaller than Aa2, H1 is a preset first height of the first push rod, G1 is a preset second height of the second push rod, and B1 is a first preset water pumping flow.

Further, when the upper excavation and filling layer area is subjected to dust fall, the controller adjusts the rising height Gi of the second push rod according to the acquired wind speed V, i is set to be 1,2, the controller compares the acquired wind speed V with each preset wind speed and adjusts Gi according to the comparison result, wherein,

when the controller selects the jth height adjusting coefficient mj to adjust Gi, setting j to be 1,2, and setting Gi 'to be Gi multiplied by mj, wherein the rise height of the adjusted second push rod is Gi',

when V is less than V1, no adjustment is performed;

when V is more than or equal to V1 and is more than or equal to V2, the controller selects a first height adjusting coefficient m1 to adjust Gi, m1 is a preset value, and m1 is more than 1 and less than 1.1;

when V2 is not more than V, the controller selects a second height adjusting coefficient m2 to adjust Gi, and m2 is set to m1 x [1+ (V-V2)/V2 ];

wherein V1 is the first preset wind speed, V2 is the second preset wind speed, and V1 is less than V2.

Further, when the excavation and filling middle layer area is subjected to dust fall, the controller compares the detected flying dust PM value A with each preset middle layer flying dust PM value, and controls each spray head to fall dust according to the comparison result, wherein,

when A is less than Ab1, the controller judges that the raised dust meets the requirement and does not fall dust;

when Ab1 is not more than A and is less than Ab2, the controller controls the first push rod to descend to a height H2, sets H2 to 2/3 multiplied by H1, controls the second push rod to descend to a height G1', sets G1 to G1 to 1/3 multiplied by H1, controls the first spray head and the third spray head to be opened by half, controls the water pump to pump water at a flow rate B2, and sets B2 to B1 multiplied by 3/4, so that the middle layer digging and filling area is dusted;

when Ab2 is not more than A, the controller controls the first push rod to descend to a height H2, controls the second push rod to descend to a height G2', sets G2 ═ G2-1/3 xH 1, controls all the spray heads to be completely opened, controls the water pump to pump water at a flow rate B3, sets B3 ═ B2 × [1+ (A-Ab2)/Ab2], and reduces dust in the middle layer digging and filling area;

wherein Ab1 is the first predetermined middle layer dust PM value, Ab2 is the second predetermined middle layer dust PM value, and Ab1 is less than Ab 2.

Further, when the dust fall is carried out on the excavation and filling middle layer area, the controller corrects the set water pump flow rate Bi according to the acquired air temperature T, i is set to be 2,3, the controller compares the acquired air temperature T with the preset air temperature T0 and corrects the water pump flow rate Bi according to the comparison result, wherein,

when the controller selects the j-th flow correction coefficient nj to correct Bi, setting j to be 1 and 2, setting Bi 'to be Bi x nj when the corrected water pump flow is Bi',

when T is less than or equal to T0, the controller selects a first flow correction coefficient n1 to correct Bi, n1 is a preset value, and n1 is more than 1 and less than 1.2;

when T is more than T0, the controller selects a second flow correction coefficient n2 to correct Bi, and sets n2 to n1 x [1+ (T-T0)/T0 ].

Further, when the excavation and filling lower layer area is subjected to dust fall, the controller compares the detected flying dust PM value A with each preset lower layer flying dust PM value, and controls each spray head to fall dust according to the comparison result, wherein,

when A is less than Ac1, the controller judges that the raised dust meets the requirement and does not fall dust;

when Ac1 is not more than A and is less than Ac2, the controller controls the first push rod to descend to a height H3, sets H3 to 1/3 × H1, controls the second push rod to reciprocate up and down between a height G1 "and a height G2" at a preset speed L1, sets G1 to G1 to 2/3 × H1 and G2 to G2 to 2/3 × H1, controls all the spray heads to be completely opened, controls the water pump to pump water at a flow rate B2', sets B2 to B1 × 1/2, and dustfalls the excavation and filling lower floor area;

when Ac2 is not more than A, the controller controls the first push rod to descend to a height H3, controls the second push rod to reciprocate up and down between the height G1 ' and the height G2 ' at a speed L2, sets L2 to L1 x [1+ (A-Ac2)/Ac2], controls all the spray heads to be completely opened, and controls a water pump to pump water at a flow B2 ' so as to perform dust fall on the excavated and filled lower layer area;

wherein Ac1 is the PM value of the first preset lower layer dust, Ac2 is the PM value of the second preset lower layer dust, and Ac1 is less than Ac 2.

Further, when the excavation and filling lower floor area is subjected to dust fall, the controller compensates the set second push rod speed Li according to the obtained air humidity Q, i is set to be 1,2, the controller compares the obtained air humidity Q with the preset air humidity Q0, and compensates the second push rod speed Li according to the comparison result, wherein,

when the controller selects the j-th speed compensation coefficient kj to compensate Qi, setting j to be 1 and 2, setting Li 'to be Li multiplied by kj after the compensated second push rod speed to be Li', wherein,

when Q is not more than Q0, the controller selects a first speed compensation coefficient k1 to compensate Qi, wherein k1 is a preset value, and k1 is more than 1 and less than 1.5;

when Q is more than Q0, the controller selects a second speed compensation coefficient k2 to compensate Qi, and sets k2 to k1 x [1- (Q-Q0)/Q0 ].

On the other hand, the invention provides an environment-friendly dust-settling treatment device for raised dust in a building construction site, which comprises,

the water tank is used for containing water for spraying, a water pump is connected to one side face of the water tank and used for pumping water in the water tank, a water pumping port is formed in the lower end of one side, connected with the water tank, of the water pump, a water discharging port is formed in the upper side face of the water pump and connected with a hose, the hose is used for conveying water, the other end of the hose is connected with a water inlet, the water inlet is formed in one end of the lower surface of a water conveying pipeline, one end, far away from the water inlet, of the water conveying pipeline is connected with a water spraying pipe, a first spray head, a second spray head and a third spray head are arranged on the lower surface of the water spraying pipe, an electronic valve is arranged in each spray head and used for controlling the opening and closing of each spray head;

the upper surface of the water tank is provided with a first push rod, the first push rod is used for driving a water pipeline to move up and down, the upper end of the first push rod is connected with a support rod, the upper end of the support rod is hinged with the water pipeline, the upper surface of the water tank is also provided with a second push rod, the other end of the second push rod is connected with the water pipeline, and the second push rod is used for driving the water pipeline to rotate in the vertical direction;

and the water pump, the first push rod, the second push rod and the electronic valves are all connected with the controller, and the controller is used for controlling the dust-settling treatment process.

Compared with the prior art, the invention has the advantages that the excavation and filling areas are divided, different areas are subjected to different dust fall treatments, the accuracy of the dust fall treatments can be effectively ensured, water resources can be effectively saved by controlling the flow of the water pump and the opening of the electronic valve, when the upper excavation and filling areas are subjected to dust fall, the working surface is on the ground surface and can be quickly diffused when raising dust is generated, so that the dust suppression efficiency can be effectively improved by controlling the water pump to pump water at a large flow rate, the diffusion of the raising dust is reduced, the dust suppression efficiency can be further improved by controlling the spraying angle of the spray head by controlling the rising height of the second push rod, the waste of water resources can be effectively avoided by controlling the flow of the water pump, the controller adjusts the rising height of the second push rod according to the acquired wind speed V, and the accuracy of the spraying angle can be further ensured by adjusting the rising height of the second push rod, thereby improving the spraying efficiency of the spray head, when the excavation and filling middle layer area is subjected to dust fall, the soil humidity is improved, the dust raising diffusion is slowed down due to the reduction of the height of the working face, the dust suppression effect can also be achieved by reducing the flow of the water pump, the spraying amount of the spray head can be effectively controlled by accurately controlling the flow of the water pump, thereby further ensuring the dust suppression efficiency and further saving water resources, the controller corrects the set flow of the water pump according to the acquired air temperature T, the accuracy of the set flow of the water pump can be further ensured by correcting the flow of the water pump, the dust suppression efficiency is further improved while saving the water resources, when the excavation and filling lower layer area is subjected to dust fall, the soil humidity is obviously improved due to the further reduction of the height of the working face, the dust raising diffusion is further slowed down, and the dust raising can be suppressed by controlling the water pump to pump water with small flow, at the moment, the spraying area is enlarged by opening all the electronic valves, meanwhile, the spraying area can be further enlarged by controlling the second push rod to move up and down, so that the dust suppression efficiency is improved, and the dust suppression efficiency can be further improved by controlling the movement speed of the second push rod according to different dust PM values.

Particularly, the controller controls the spray heads to perform dust fall by comparing the detected flying dust PM value A with the preset upper flying dust PM values, the spraying angle can be effectively guaranteed to meet the dust suppression requirement by controlling the rising height of the second push rod, the dust suppression efficiency is further improved, and the dust suppression efficiency is further improved by controlling the opening of the spray heads.

Particularly, the controller adjusts Gi by comparing the acquired wind speed V with each preset wind speed, and can effectively improve the accuracy of setting the rising height of the second push rod by adjusting the rising height Gi of the second push rod, so that the spraying angle is further ensured to meet the dust suppression requirement, and the dust suppression efficiency is further improved.

Particularly, the controller compares the detected flying dust PM value A with each preset middle-layer flying dust PM value to control each spray head to dust, and after the excavating and filling working surface is lowered, the spraying amount of the spray heads can be effectively controlled by accurately controlling the flow of the water pump, so that the dust suppression efficiency can be further improved, and meanwhile, water resources are further saved.

Particularly, the controller corrects the flow Bi of the water pump by comparing the acquired air temperature T with the preset air temperature T0, and can further ensure the accuracy of controlling the flow of the water pump through correction, so that the spraying amount of the spray head is further ensured to meet the dust suppression requirement, the dust suppression efficiency is further improved, and the water resource is further saved.

Particularly, the controller compares the detected flying dust PM value A with each preset lower-layer flying dust PM value, controls each spray head to perform dust fall according to the comparison result, and can effectively enlarge the spraying area of the spray head by controlling the second push rod to move up and down, so that the dust suppression efficiency is further improved, and the dust suppression efficiency is further improved by controlling the movement speed of the second push rod.

In particular, the controller compensates for the second ram speed Li by comparing the acquired air humidity Q with the preset air humidity Q0, and the accuracy of setting the second ram speed can be further improved by the compensation, thereby further improving the dust suppression efficiency.

Drawings

FIG. 1 is a schematic flow chart of a dust-raising, environmental-protection and dust-falling treatment method for a construction site in the embodiment;

fig. 2 is a schematic cross-sectional view of a rectangular foundation pit to be excavated and filled according to the embodiment.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1 is a schematic flow chart of the environmental protection dust-settling treatment method for the raised dust in the construction site of the building of this embodiment, which includes,

step S1, selecting any short side of the rectangular foundation pit to be excavated and filled to dig a placement pit, and placing the dust-settling treatment device into the placement pit, wherein the depth of the placement pit is the same as that of the rectangular foundation pit to be excavated and filled, and the length of the placement pit is the same as that of the short side of the rectangular foundation pit to be excavated and filled;

it can be understood that the width of the placing pit is not specifically limited, and only the placing requirement of the dust-falling processing device needs to be met, and the type and size of the dust detector are not specifically limited, and only the dust detection requirement needs to be met.

Please refer to fig. 2, which is a schematic cross-sectional view of a rectangular foundation pit to be excavated and filled according to the present embodiment, where the rectangular foundation pit to be excavated and filled includes a placement pit and an excavated and filled area, a dust-settling processing device is placed in the placement pit, a dust detector 15 is disposed outside the excavated and filled area, the dust detector 15 is configured to detect a dust PM value, a temperature, a humidity, and a wind speed of air, and the excavated and filled area is uniformly divided into an excavated and filled upper layer area 16, an excavated and filled middle layer area 17, and an excavated and filled lower layer area 18 according to a depth;

the dust fall processing device comprises a water tank 1 for containing water for spraying, a water pump 2 connected to one side of the water tank 1 for pumping water from the water tank 1, a water pumping port 3 arranged at the lower end of one side of the water pump connected to the water tank 1, a water outlet 4 arranged at the upper side of the water pump, a hose 5 connected to the water outlet 4, the hose 5 for conveying water, a water inlet 6 connected to the other end of the hose 5, a water inlet 6 arranged at one end of the lower surface of a water pipe 7, a sprinkler pipe 11 connected to one end of the water pipe 7 far away from the water inlet 6, a first nozzle 12, a second nozzle 13 and a third nozzle 14 arranged at the lower surface of the sprinkler pipe 11, electronic valves (not shown in the figure) arranged in the respective nozzles and used for controlling the nozzles to be opened and closed, a first push rod 10 is arranged on the upper surface of the water tank 1, the first push rod 10 is used for driving a water pipeline 7 to move up and down, a support rod 9 is connected to the upper end of the first push rod 10, the upper end of the support rod 9 is hinged to the water pipeline 7, a second push rod 8 is further arranged on the upper surface of the water tank 1, the other end of the second push rod 8 is connected with the water pipeline 7, and the second push rod 8 is used for driving the water pipeline 7 to rotate in the vertical direction;

the water pump 2, the first push rod 10, the second push rod 8, the electronic valves and the dust detector 15 are all connected with a controller (not shown in the figure), the controller is used for controlling the dust fall processing process, and the controller can also be used for manually inputting the current soil filling layer.

Specifically, in the step S3, when performing dust suppression on the excavation and filling upper layer area, the controller compares the detected raise dust PM value a with each preset upper layer raise dust PM value, and controls each spray head to perform dust suppression according to the comparison result, wherein,

when Aa1 is more than or equal to and less than Aa2, the controller controls the first push rod to ascend to a height H1, controls the second push rod to ascend to a height G1, controls the first spray head and the third spray head to be opened by half, and controls the water pump to pump water at a flow rate B1 so as to perform dust fall on the upper digging and filling layer;

when Aa2 is not more than A, the controller controls the first push rod to ascend to a height H1, controls the second push rod to ascend to a height G2, controls all the spray heads to be completely opened, controls the water pump to pump water at a flow rate B1 so as to perform dust fall on the upper digging and filling area, and sets G2 to G1 x [1+ (A-Aa2)/Aa2 ];

Particularly, this embodiment the controller is through the raise dust PM value A that obtains that will detect and each predetermine upper strata raise dust PM value and compare control each the shower nozzle carries out the dust fall, through the rise height of control second push rod, can effectively guarantee to spray the angle and satisfy and press down the dirt demand to further improve and press down dirt efficiency, and through control each the shower nozzle open, can further improve and press down dirt efficiency.

Specifically, when the dust is settled in the upper excavation and filling area, the controller adjusts the rising height Gi of the second push rod according to the acquired wind speed V, i is set to 1,2, compares the acquired wind speed V with each preset wind speed, and adjusts Gi according to the comparison result, wherein,

when V is less than V1, no adjustment is performed;

Specifically, when the excavation and filling middle layer area is subjected to dust fall, the controller compares the detected flying dust PM value A with each preset middle layer flying dust PM value, and controls each spray head to carry out dust fall according to the comparison result, wherein,

Specifically, in this embodiment, the controller compares the detected flying dust PM value a with each preset middle-layer flying dust PM value to control each spray head to perform dust fall, and after the excavation and filling working surface is reduced, the spraying amount of the spray head can be effectively controlled by accurately controlling the flow rate of the water pump, so that the dust suppression efficiency can be further improved, and meanwhile, the water resource is further saved.

Specifically, when the dust fall is performed on the excavation and filling middle layer area, the controller corrects the set water pump flow rate Bi according to the acquired air temperature T, sets i to 2,3, compares the acquired air temperature T with the preset air temperature T0, and corrects the water pump flow rate Bi according to the comparison result,

Specifically, when the excavation and filling lower layer area is subjected to dust fall, the controller compares the detected flying dust PM value A with each preset lower layer flying dust PM value, and controls each spray head to carry out dust fall according to the comparison result, wherein,

Specifically, this embodiment the controller compares raise dust PM value A that obtains with each preset lower floor raise dust PM value to control each according to the comparison result the shower nozzle carries out the dust fall, through controlling the second push rod carries out the up-and-down motion, can effectively enlarge the spray area of shower nozzle, thereby further improves and presses down dirt efficiency, through the velocity of motion of control second push rod, can further improve and press down dirt efficiency.

Specifically, when the excavation and filling lower floor area is dusted, the controller compensates the set second ram speed Li according to the acquired air humidity Q, and sets i to 1,2, compares the acquired air humidity Q with the preset air humidity Q0, and compensates the second ram speed Li according to the comparison result, wherein,

Specifically, the controller according to this embodiment compensates the second ram speed Li by comparing the acquired air humidity Q with the preset air humidity Q0, and the accuracy of setting the second ram speed can be further improved by the compensation, thereby further improving the dust suppression efficiency.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims

1. An environment-friendly dust falling treatment method for raised dust on a building construction site is characterized by comprising the following steps of,

when the excavation and filling lower layer area is subjected to dust fall, the controller controls each spray head to perform dust fall on the excavation and filling lower layer area according to the detected raised dust PM value A, different second push rod speeds are set on the basis of data of the excavation and filling middle layer area to control the spraying range of the spray head, and meanwhile, the controller compensates the set second push rod speeds according to the obtained air humidity Q;

in the step S3, when performing dust suppression on the excavation and filling upper layer area, the controller compares the detected raise dust PM value a with each preset upper layer raise dust PM value, and controls each spray head to perform dust suppression according to the comparison result, wherein,

when Aa2 is not more than A, the controller controls the first push rod to ascend to a height H1, controls the second push rod to ascend to a height G2, sets G2= G1 x [1+ (A-Aa2)/Aa2], controls all the spray heads to be completely opened, and controls the water pump to pump water at a flow rate B1 so as to perform dust fall on the upper layer area of the excavation and filling;

wherein Aa1 is a first preset upper layer dust PM value, Aa2 is a second preset upper layer dust PM value, Aa1 is more than Aa2, H1 is a preset first push rod first height, G1 is a preset second push rod first height, and B1 is a first preset water pumping flow;

when the upper excavation and filling layer area is subjected to dust fall, the controller adjusts the rising height Gi of the second push rod according to the acquired wind speed V, i =1,2 is set, the controller compares the acquired wind speed V with each preset wind speed and adjusts Gi according to the comparison result, wherein,

when the controller selects the jth height adjusting coefficient mj to adjust Gi, setting j =1,2, and setting Gi '= Gi × mj for the adjusted rising height of the second push rod as Gi', wherein,

when V is less than V1, no adjustment is performed;

when V is more than or equal to V1 and is more than V2, the controller selects a first height adjusting coefficient m1 to adjust Gi, wherein m1 is a preset value, and m1 is more than 1 and less than 1.1;

when V2 is not more than V, the controller selects a second height adjusting coefficient m2 to adjust Gi, and m2= m1 x [1+ (V-V2)/V2] is set;

2. The environment-friendly dust-settling treatment method for the raise dust in the construction site as claimed in claim 1, wherein when the excavation and filling middle layer area is settled, the controller compares the detected raise dust PM value A with each preset middle layer raise dust PM value, and controls each spray head to settle dust according to the comparison result, wherein,

when Ab1 is not less than A < Ab2, the controller controls the first push rod to descend to a height H2, sets H2=2/3 × H1, controls the second push rod to descend to a height G1 ', sets G1' = G1-1/3 × H1, controls the first spray head and the third spray head to be opened by half, controls the water pump to pump water at a flow rate B2, and sets B2= B1 × 3/4 to perform dust fall on the middle digging and filling layer area;

when Ab2 is not more than A, the controller controls the first push rod to descend to a height H2, controls the second push rod to descend to a height G2 ', sets G2' = G2-1/3 × H1, controls all the spray heads to be completely opened, controls the water pump to pump water at a flow rate B3, and sets B3= B2 × [1+ (A-Ab2)/Ab2] to perform dust reduction on the excavation and filling middle layer area;

3. The environment-friendly dust-settling treatment method for dust on the construction site as claimed in claim 2, wherein when the middle excavation and filling layer area is settled, the controller corrects the set water pump flow rate Bi according to the acquired air temperature T, sets i =2,3, compares the acquired air temperature T with the preset air temperature T0, and corrects the water pump flow rate Bi according to the comparison result, wherein,

when the controller selects the jth flow correction coefficient nj to correct Bi, j =1,2 is set, the corrected water pump flow is Bi ', Bi' = Bi x nj is set, wherein,

when T is larger than T0, the controller selects a second flow correction coefficient n2 to correct Bi, and sets n2= n1 x [1+ (T-T0)/T0 ].

4. The environment-friendly dust-settling treatment method for the raise dust in the construction site according to claim 3, wherein when the excavation and filling lower floor area is settled, the controller compares the detected raise dust PM value A with each preset lower floor raise dust PM value, and controls each spray head to settle dust according to the comparison result, wherein,

when A is less than Ac1, the controller judges that the raised dust meets the requirement, and does not fall dust;

when Ac1 is not less than A and is less than Ac2, the controller controls the first push rod to descend to a height H3, sets H3=1/3 × H1, controls the second push rod to reciprocate up and down between the height G1 "and the height G2" at a preset speed L1, sets G1 "= G1-2/3 × H1 and G2" = G2-2/3 × H1, controls all the spray heads to be completely opened, controls the water pump to pump water at a flow rate B2 ', sets B2' = B1 × 1/2, and performs dust reduction on the excavated and filled lower layer area;

when Ac2 is not more than A, the controller controls the first push rod to descend to a height H3, controls the second push rod to reciprocate up and down between a height G1 ' and a height G2 ' at a speed L2, sets L2= L1 x [1+ (A-Ac2)/Ac2], controls all the spray heads to be completely opened, and controls a water pump to pump water at a flow rate B2 ' so as to perform dust fall on the excavated and filled lower layer area;

5. The environment-friendly dust-falling treatment method for dust emission in the construction site according to claim 4, wherein when the excavation and filling lower floor area is subjected to dust falling, the controller compensates the set second push rod speed Li according to the obtained air humidity Q, i =1,2 is set, the controller compares the obtained air humidity Q with the preset air humidity Q0, and compensates the second push rod speed Li according to the comparison result, wherein,

when the controller selects the j-th speed compensation coefficient kj to compensate Li, j =1,2 is set, and the compensated second push rod speed is Li ', Li' = Li × kj is set, wherein,

when Q is not more than Q0, the controller selects a first speed compensation coefficient k1 to compensate Li, k1 is a preset value, and k1 is more than 1 and less than 1.5;

when Q is larger than Q0, the controller selects a second speed compensation coefficient k2 to compensate Li, and sets k2= k1 x [1- (Q-Q0)/Q0 ].

6. The device for environment-friendly dust falling treatment of the flying dust at the construction site according to any one of claims 1 to 5, is characterized by comprising,