Classifications

• • E—FIXED CONSTRUCTIONS
  • E04—BUILDING
  • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
  • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
  • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
  • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
  • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
  • E04B1/84—Sound-absorbing elements

Definitions

• the invention relates to the field of construction, especially to building facade construction elements, which reduce indoor physical pollution, where can be observed transmission of sound in the structure of building. More especially it relates to device on the building facade construction for absorption of structure -borne noise or another type of noises, which are connected with falling phenomenon (jet, drops or hail and other hard objects).
• the structure-borne noise made by environment can significantly act on sleep quality at night and work and indoor communication at the daytime.
• Patent No. RU 2307843 in Russia describes sound absorbing material and its producing method. Material is made from foam polyethylene.
• Patent No. AU 2009206197 in Australia describes fire safe, noise isolating coating, which can be laid under the building facade, accordingly do not proceed straight noise absorption.
• the building facades in majority of the modern buildings, including residential buildings, are made from metallic or plastic sheet. Usually these sheets are constructively associated with the building facade. In such a way construction mechanical vibrations can cause the resonance of construction elements and increases the noise level in the air that is the structure-borne noise. Regular type of environment influence, that causes physical pollution, is rain. Hail that can be reason of intensive structure-borne noise and vibrations is rarer phenomena that is why it is not described in this case. Vibration reducing self-adhesive tapes are used for decreasing the vibrations made by metallic or plastic construction in facade construction. Tapes can be attached to the bottom of the facade construction during the building process. Unfortunately this solution is not applicable for all types of metallic or plastic facade constructions. A solution is necessary for reduction of structure borne noise wherein said solution could be used for facade constructions which can be reached from the outdoors or outside with or without technical means and are suitable for individual building.
• Aim of invention is device for building facade construction for absorption of the structure- borne noise made by environment, characterized in that it comprises reticulated foam polyester sheet with sieve structure and open pores, wherein thickness of the sheet is in range of 9 to 14 mm, amount of pores is in range of 2.2 to 3.2 cm “1 , and density of the material is in range of 23 to 29 kg/m 3 , especially 26 kg/m 3 .
• Said sheet on one side can be provided with self-adhesive layer which adheres with the building facade construction surface.
• acoustic absorbent for covering of building facade construction, typical characteristics of rain must be cleared out. Rain is described by several parameters including height of raindrop falling, intensity (liters of water in minute per square meter) and average drop diameter. For determination of different intensities of rain, classification IEC 60721-2-2 specified in Table 1 can be taken as a reference.
• Structure-borne (Ekr) measurements for facade construction without absorption coating and the structure -borne (Eat) measurements for facade construction covered with different types of acoustic absorbent device in size of 1.2 x 1.2 m were made.
• structure-borne noise absorption was used reticulated foam polyester sheet with thickness in range of 5 to 20 mm, sieve structure and open pores.
• a reticulated foam polyester sheet was used with a thickness in range of 5 to 20 mm, sieve structure and open pores.
• the size of raindrops is in range of 2 to 5 mm.
• raindrop In order to achieve power dissipation in structure-borne noise reduction acoustic absorption device, raindrop must be broken down into several parts. If open pore size in absorbent device is in range of 1.9 to 4.5 mm, raindrops with diameter up to 2 mm can stuck in the pores without breaking down and if open pores are in diameter up to 5 mm raindrops break down in 2-3 parts on separating surface of sieve structure.
• Second important parameter for selection of structure-borne noise reduction device is density of material. Structure-borne noise absorption effect will be minimal because a high density water will accumulate in material upper part.
• the optimal structure-borne noise absorption can be provided by reticulated polyester foam material with sieve structure and open pores, with average amount of pores 2.2 to 3.2 cm "1 , relative density of 26 kg/m 3 +/- 3 kg/m 3 , hardness 2.7 to 4.7 kPa, durability over 60kPa, and relative elongation before the breaking - 100%.
• said acoustic absorbent in frequency range of 100-4000 Hz can provide structure-borne noise absorption with absorption coefficient (a) from 0.98 till 0.994, which depends on corresponding devices location with respect to horizontal plane, comparing with structure -borne noise on respective device in corresponding location without said device.
• the device provides structure -borne noise, connected with falling phenomenon (jet, drop or hail and other hard objects), absorption on facade construction, with absorption coefficient in range of 0.98 to 0.994, which depends on devices location with respect to the horizontal plane.
• Absorption device fixation on facade construction is easy and do not ask any special technical skills and with suitable glue or self-sticking tape it can be done in short time on any floor of the building.
• Size of material can be adjustable to typical facade construction size during production or at the place of usage.
• Material of device is antibacterial, does not accumulate dirt, avoid plant growth on it and is fire safe (flame retardant).
• Present invention offers a method for structure-borne noise reduction, which is associated with the falling phenomenon absorption on facade construction, providing entire facade construction outer surface coated with structure -borne noise absorbing acoustic absorbent.
• Reticulated polyester foam sheet with sieve structure and open pores acts like a structure- borne noise absorbing acoustic absorbent.
• absorbent device thickness is 14 mm
• absorbent device thickness is 9 mm
• amount of pores on 1 cm is from 2.2-3.2
• material relative density is 26 kg/m 3 +/- 3 kg/m 3
• hardness is in range of 2.7-4.7 kPa
• durability over 60kPa and relative elongation before the breaking - 100%.
• Reticulated polyester foam sheet with sieve structure and open pores in optimal solution is with additives that avoid plant growth on it.
• Material is fire safe (flame retardant).
• a foam polyester sheet with sieve structure and open pores is provided with one self- adhesive layer, what a long time keeps the coating association with metallic or plastic facade construction.
• Device can be industrially produced in several colours, for differently sized standard facade constructions or can be adapted by cutting in necessary dimensions at the place. Its fixation does not ask any special technical skills, it is fast and safe.
• Device traits and effectiveness is shown below in Table 2. Effectiveness of acoustic absorbent device situated in different angles with respect to horizontal plane is shown in Table 2.
• Table 2 shows measurements on structure-borne noise on building facade construction that is connected with falling phenomenon. Noise is reduced by using a structure-borne noise acoustic absorbent with absorption coefficient of more than 0.98. Therefore used acoustic absorbent complies with the A class of EN-ISO 11654.
• Material for said acoustic absorbent can be industrially produced in different colors, with already laid self - sticking layer, which simplifies the application.

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• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Electromagnetism (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Building Environments (AREA)
• Finishing Walls (AREA)

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Publications (1)

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Family Applications (1)

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Citations (3)

• 2013
  • 2013-11-26 LV LVP-13-192A patent/LV14829B/lv unknown
• 2014
  • 2014-05-09 WO PCT/IB2014/061329 patent/WO2015079327A1/en active Application Filing

Patent Citations (3)

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