Construction noise reducing device based on wind load

Abstract

The invention discloses a construction noise reduction device based on a wind load. The construction noise reduction device comprises a wind speed sensing unit, a control unit and a noise reduction unit. The wind speed sensing unit is used for acquiring the wind direction and the wind speed in the current scene; the noise reduction unit comprises a wind shielding assembly and a driving mechanism; the wind blocking assembly comprises a swing rod and a fixed rod which are arranged in parallel in the length direction of the scaffold on the outer side of the building, a first wind blocking plate is arranged on the swing rod in the length direction, a second wind blocking plate is arranged on the fixed rod in the length direction, and ventilation holes are formed in the first wind blocking plate and the second wind blocking plate; the control unit is used for analyzing the wind direction and the wind speed collected by the wind speed sensing unit and generating a control instruction. The device provided by the invention can adaptively adjust the perforation overlapping area along with the wind speed, and the construction noise influence can be reduced to the maximum extent under the condition of ensuring the safety.

Description

Technical Field

[0001] The invention belongs to the technical field of noise control, and in particular relates to a device for reducing construction noise based on wind load. Background Art

[0002] Scaffolding at construction sites is usually equipped with protective nets to prevent construction workers or materials from falling, ensure construction safety, and also play a role in preventing wind and dust. Due to the large pores of the protective net, it does not have a noise reduction function. How to combine the construction site protective net to develop a noise reduction device to reduce the impact of construction noise is an urgent problem to be solved.

[0003] Patent document CN219732737U discloses a safety protection enclosure for construction scaffolding, which blocks the spread of dust and noise by sequentially arranging fireproof panels, noise reduction panels and dustproof panels in the frame. The safety protection enclosure disclosed in the patent has the following defects: first, the enclosure adopts a fully enclosed structure and the flow area is not adjustable. When the wind speed is high, the wind load is large, which poses a serious safety hazard; second, the enclosure affects lighting and is not convenient for construction.

[0004] Patent document CN214462439U discloses an external shielding device for buildings, which continuously hangs steel mesh and perforated mesh panels on the outside of the building body to achieve noise reduction and dust prevention. Since the steel mesh and perforated mesh panels have large pores and cannot adjust the pore size according to the wind speed, the noise reduction effect is poor at the allowable wind speed. Summary of the invention

[0005] The object of the present invention is to provide a construction noise reduction device based on wind load, which has sound absorption and dust prevention functions and can minimize the impact of construction noise while ensuring safety.

[0006] In order to achieve the purpose of the present invention, the following technical solutions are provided: a device for reducing construction noise based on wind load, comprising a wind speed sensing unit, a control unit and a noise reduction unit;

[0007] The wind speed sensing unit is used to obtain the wind direction and wind speed in the current scene;

[0008] The noise reduction unit includes a windshield assembly and a driving mechanism, wherein there are multiple windshield assemblies, and the multiple windshield assemblies are connected end to end along the length direction of the scaffold to surround the floors of the building;

[0009] The windshield assembly comprises a swing rod and a fixed rod arranged in parallel along the length direction of the scaffolding outside the building, a first windshield is provided on the swing rod along the length direction, a second windshield is provided on the fixed rod along the length direction, and ventilation holes for air circulation inside and outside the building are provided on the first windshield and the second windshield, and an effective ventilation opening is constructed by the overlapping parts of the ventilation holes on the first windshield and the second windshield arranged in parallel;

[0010] The driving mechanism includes a transmission assembly and a driving motor that provides driving force for the transmission assembly, and the transmission assembly is used to adjust the relative position between the swing rod and the fixed rod;

[0011] The control unit is used to analyze the wind direction and wind speed collected by the wind speed sensing unit, generate control instructions and send them to the drive motor for regulation to change the actual area size of the effective ventilation opening.

[0012] The present invention adjusts the relative position between the two wind shields by adjusting the driving motor, so as to adaptively adjust the perforation overlapping area according to the wind speed, thereby minimizing the impact of construction noise while ensuring safety.

[0013] Specifically, the first windshield plate and the second windshield plate are both provided with counterweights.

[0014] Specifically, the distance between the swing rod and the fixed rod is no greater than the thickness of a windshield.

[0015] Specifically, a plurality of ventilation holes are provided on the first wind shield plate and the second wind shield plate, and the plurality of ventilation holes are arranged in an array on the surface.

[0016] Specifically, when multiple windshield assemblies are connected end to end, the front fixed rod and the rear fixed rod are coaxially arranged, the front swing rod and the rear swing rod are coaxially arranged, and the overlapping portion length of two coaxially adjacent windshield plates is greater than or equal to 3 cm.

[0017] Specifically, the control instruction includes the rotation arc and rotation direction of the output end of the driving motor.

[0018] Specifically, during the adjustment process, the maximum width of the actual area of ​​the effective ventilation opening is less than 1 mm, and the noise reduction effect is better.

[0019] Specifically, the control unit includes:

[0020] A wind speed data receiving module, used to receive data collected by a wind speed sensing unit;

[0021] An analysis and processing module, which calculates the current wind load according to the collected data and compares it with the preset allowable wind load, and if the current wind load is greater than the preset allowable wind load, or if the current wind load is less than the preset allowable wind load and the absolute value of the difference is greater than a threshold, calculates the preset width of the effective vent based on the current wind load, and generates a control instruction based on the preset width;

[0022] If the current wind load is less than the preset allowable wind load and the absolute value of the difference is less than the threshold, continue to collect data at the next moment;

[0023] The communication output module is used to send the generated control instructions to the noise reduction unit.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] Under the premise of ensuring light weight and easy disassembly and assembly, the wind shield is used in conjunction with various auxiliary components to make the designed noise reduction device have sound absorption and dust prevention properties, and the overlapping area of ​​the two layers of perforated plates is adaptively adjusted with the wind speed, that is, the flow area of ​​the noise reduction device at different wind speeds is adaptively adjustable, ensuring that the load at different wind speeds meets the safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of the construction noise reduction device provided in this embodiment;

[0027] Figure 2 A front view of the construction noise reduction device provided in this embodiment;

[0028] Figure 3 A diagram showing the change in width of the effective vent provided in this embodiment;

[0029] Figure 4 A schematic diagram of the working process of the control unit provided in this embodiment;

[0030] In the figure, 1. wind speed sensing unit; 2. control unit; 3. noise reduction unit; 11. anemometer; 21. wind speed data receiving module; 22. analysis and processing module; 23. signal output module; 31. driving mechanism; 32. first wind shield; 33. first wind shield; 34. swing rod; 35. counterweight; 36. fixing rod. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1 and Figure 2 As shown, the construction noise reduction device provided in this embodiment includes a wind speed sensing unit 1, a control unit 2 and a noise reduction unit 3.

[0033] More specifically, the wind speed sensing unit 1 in this embodiment mainly includes an anemometer 11 , which is used to obtain wind speed and wind direction in real time, and transmit the obtained information to the control unit 2 .

[0034] The noise reduction unit 3 includes a wind shield assembly and a driving mechanism 31. There are multiple wind shield assemblies, and the multiple wind shield assemblies are connected end to end along the length direction of the scaffolding to surround the floors of the building.

[0035] The driving mechanism 31 includes a transmission component and a driving motor. The transmission component in this embodiment uses a gear set with the same working principle as the electric curtain to achieve horizontal movement or lifting movement of the swing rod. The gear set is a well-known structure in the mechanical field and is not a key invention point, so it will not be repeated.

[0036] The wind shield assembly includes a swing rod 34 and a fixed rod 36 arranged in parallel along the length direction of the scaffolding outside the building. The swing rod 34 is provided with a first wind shield 32 along the length, and the fixed rod 36 is provided with a second wind shield 33 along the length direction. The first wind shield 32 and the second wind shield 33 are both provided with air holes, and an effective vent is constructed by the overlapping part of the air holes on the first wind shield 32 and the second wind shield 33 arranged in parallel. The effective vent is as follows Figure 3 As shown in the center overlap portion, at the allowable wind speed, the actual maximum width of the effective ventilation opening is less than 1 mm.

[0037] The first windshield 32 or the second windshield 33 is made of transparent material and is provided with perforations. The perforations are relatively large in diameter and are distributed at equal intervals in rectangular, circular or other regular shapes. A mass block 35 can be added to the bottom of the windshield to prevent the windshield from swinging under the action of wind force at the allowable wind speed. The size, material and other parameters of the mass block 35 are adjustable. The distance between the first windshield 32 and the second windshield 33 is less than the thickness of the windshield.

[0038] The noise reduction unit 3 can be vertically installed on the scaffolding by means of cable ties or other reasonable fixing devices. When multiple windshield assemblies are connected end to end, the front fixed rod is coaxially arranged with the rear fixed rod, the front swing rod is coaxially arranged with the rear swing rod, and the overlapping length of two coaxially adjacent windshield plates is greater than or equal to 3 cm.

[0039] like Figure 4The anemometer 11 of the wind speed sensing unit 1 is placed at a height h0 from the ground, and the wind direction and wind speed information at the time t0+i△t is obtained at intervals of △t.

[0040] The signal receiving module 21 in the control unit 2 receives the wind direction and wind speed information at the time t0+iΔt.

[0041] The analysis and processing module 22 calculates the wind speed v at the height h from the center point of each windshield at time t0+i△t according to formula (1): h .

[0042] like Figure 1 The angle between the wind direction and the noise reduction device shown in the figure can be used to calculate the wind speed components v in the x, y and z directions at time t0+i△t. x =v h cosβ1,v y =v h cosβ2,v z =v h cosβ3.

[0043] According to formulas (2) and (3), the wind pressure P in the z direction at time t0+i△t is calculated as follows: iz and wind load F iz (Since the scaffold is not easy to move in the x and y directions, the wind pressure P in the x and y directions can be ignored. ix , P iy With wind load F ix 、F iy ).

[0044]

[0045] F iz =AP iz (3)

[0046] In the formula, v h The wind speed at the height h from the center of the windshield to the ground, in m / s;

[0047] v0 is the wind speed at the height h0 of the anemometer from the ground, in m / s;

[0048] α is the wind speed variation index with height. According to different topography, α has different values, which can be determined according to the Code for Loads on Building Structures.

[0049] v z is the wind speed in the z direction, in m / s;

[0050] ρ is the air density, unit is kg / m 3 ;

[0051] i takes 0, 1, 2...;

[0052] A is the force-bearing area, unit: m 2 ;

[0053] P iz is the wind pressure in the z direction, unit: Pa.

[0054] In this example, the vent hole is circular. Taking the wind shield with a vent hole radius of r as an example, after the first wind shield 32 moves, if the wind load F in the z direction of each wind shield at time t0+i△t is iz The sum is greater than the allowable wind load F in the z direction 0z (Allowable wind load F 0z The current wind load F is determined by the structural strength, material and height of the scaffolding. iz The corresponding minimum allowable flow area S of the noise reduction device min =S 总 -A(where S 总 The windshield is the length multiplied by the width), and the moving direction and distance d of the windshield are determined according to formula (4), thereby determining the rotation direction and rotation arc of the drive motor 31. The signal output module 23 transmits the above control signal to the noise reduction unit 3. iz Less than or equal to the allowable wind load F 0z And |F iz -F 0z | is greater than the set threshold a, the current wind load F is calculated iz The corresponding minimum allowable flow area S of the noise reduction device min , determine the rotation direction and rotation arc of the drive motor 31, the signal output module 23 transmits the above control signal to the noise reduction unit 3, if the wind load F iz Less than or equal to the allowable wind load F 0z And |F iz -F 0z | is less than or equal to the set threshold a, the control unit obtains the wind direction and speed information at time t0+(i+1)△t and repeats the above process.

[0055]

[0056] Where d is the distance the windshield needs to move, in meters;

[0057] r is the radius of the circular perforation, in m;

[0058] θ1 is the angle between the two windshields before they move, in degrees;

[0059] θ2 is the angle between the two windshields after they move, in degrees (where θ1 and θ2 can be expressed by Calculated, n is the number of ventilation holes).

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for reducing construction noise based on wind load, characterized in that: Including wind speed sensing unit, control unit and noise reduction unit; The wind speed sensing unit is used to obtain the wind direction and wind speed in the current scene; The noise reduction unit includes a windshield assembly and a driving mechanism, wherein there are multiple windshield assemblies, and the multiple windshield assemblies are connected end to end along the length direction of the scaffold to surround the floors of the building; The wind shield assembly comprises a swing rod and a fixed rod arranged in parallel along the length direction of the scaffolding outside the building, a first wind shield is provided on the swing rod along the length direction, a second wind shield is provided on the fixed rod along the length direction, and ventilation holes for air circulation inside and outside the building are provided on the first wind shield and the second wind shield, and an effective ventilation opening is constructed by the overlapping parts of the ventilation holes on the first wind shield and the second wind shield arranged in parallel; The driving mechanism includes a transmission assembly and a driving motor that provides driving force for the transmission assembly, and the transmission assembly is used to adjust the relative position between the swing rod and the fixed rod; The control unit is used to analyze the wind direction and wind speed collected by the wind speed sensing unit, generate control instructions and send them to the drive motor for regulation to change the actual area size of the effective ventilation opening.

2. The device for reducing construction noise based on wind load according to claim 1 is characterized in that: The first windshield plate and the second windshield plate are both provided with counterweights.

3. The device for reducing construction noise based on wind load according to claim 1, characterized in that: The distance between the swing rod and the fixed rod is no greater than the thickness of a windshield.

4. The device for reducing construction noise based on wind load according to claim 1, characterized in that: A plurality of ventilation holes are provided on the first wind shield plate and the second wind shield plate, and the plurality of ventilation holes are arranged in an array on the surface.

5. The device for reducing construction noise based on wind load according to claim 1, characterized in that: When multiple windshield assemblies are connected end to end, the front fixed rod and the rear fixed rod are coaxially arranged, the front swing rod and the rear swing rod are coaxially arranged, and the overlapping part length of two coaxially adjacent windshield plates is greater than or equal to 3 cm.

6. The device for reducing construction noise based on wind load according to claim 1, characterized in that: The control instruction includes the rotation arc and rotation direction of the output end of the driving motor.

7. The device for reducing construction noise based on wind load according to claim 1, characterized in that: During the adjustment process, the maximum width of the actual area of ​​the effective ventilation opening is less than 1 mm.

8. The device for reducing construction noise based on wind load according to claim 1, characterized in that: The control unit comprises: A wind speed data receiving module, used to receive data collected by a wind speed sensing unit; An analysis and processing module, which calculates the current wind load according to the collected data and compares it with the preset allowable wind load, and if the current wind load is greater than the preset allowable wind load, or if the current wind load is less than the preset allowable wind load and the absolute value of the difference is greater than a threshold, calculates the preset width of the effective vent based on the current wind load, and generates a control instruction based on the preset width; If the current wind load is less than the preset allowable wind load and the absolute value of the difference is less than the threshold, continue to collect data at the next moment; The communication output module is used to send the generated control instructions to the noise reduction unit.

Images