A) BAFFLE SCREEN ELEMENTS
1) Ground beam 22 ÷ 30 cm wide, approximately 50
cm high (construction acc. to calculation) - prefabricated
2) IPE I-bar - 100mm half-immersed in ground beam
3) IPE steel poles - 180 or 160 with baffle hight
up to 4 m, - HEB steel poles - 180 with baffle hight beyond 4 m, embedded in
concrete acc. to the technical project. Distance in pole axes amounts to 4m (it can
be smaller, depending on local conditions)
4) Closed profile 100 x 40 x 3 or 100 x 40 x 4 layed
along the screen in grooves of sound absorbing sawdust concrete hollow bricks - in
every second layer - inserted in vertical pole flanges
5) Sound absorbing sawdust concrete hollow bricks
a) Sound absorbing sawdust concrete hollow brick
CS-24-1-30W dimensions: 60cm long x 35cm wide x 20cm high, with resonance holes
b) Sound absorbing sawdust concrete hollow brick (left half-header)
CS-24-1-30 W 1 L dimensions: 30cm long x 35cm wide x 20cm high
c) Sound absorbing sawdust concrete hollow brick (righ half-header)
CS-24-1-30 W 1 P dimensions: 30cm long x 35cm wide x 20cm high
d) Sound absorbing sawdust concrete hollow brick (left half-header - for pole
casing) CS-24-1-30 W 1 L dimensions: 20cm long x 30cm wide x 20cm high
e) Sound absorbing sawdust concrete hollow brick (roght half-header - for pole
casing) CS-24-1-30 W 1 P dimensions: 20cm long x 30cm wide x 20cm high
6) Coping hollow brick (concrete) CS-Z dimensions:
20cm long x 44cm wide x 18cm high
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Set of sawdust
concrete elements for baffle type V
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B) BAFFLE SCREEN BUILDING
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Building baffle
type V from sound absorbing sawdust concrete hollow bricks CS-24-1-30-W on
protective concrete parapet
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Baffle type V
from sound absorbing sawdust concrete hollow bricks CS-24-1-30-W (perspective)
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9.2. Acoustic characteristics
Baffle acoustic insulation as tested amounts to:
Rav
= 55 dB
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Fig. 2. Location of observation points O1 and O2 in relation to which
comparative evaluation of baffle efficiency was conducted
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Acoustic efficiency is presented in the table below:
9.3. Baffle assembling
1) Acoustic baffle type IV is assembled on ground beam (with horizontal insulation) with steel
poles HEB180 or HEB160 embedded in concrete, IPE - 180 or 160. In the groud beam there is a I-bar
IPE100 half embedded in concrete - its protruding part forms a channel bar.
2) Sound absorbing sawdust concrete hollow bricks with upper and lower recesses for
placing of 100x40x3 profiles, and with side locks used for clamping the hollow bricks
in vertical planes are placed on the above-mentioned construction.
Placement of hollow bricks in horizontal layer begins at the left of vertical
pole in the following order:
- hollow brick CS-24-1-30 W 1 L
- 6 hollow bricks CS-24-1-30-W
- hollow brick CS-24-1-30 W 1 P
ATTENTION !
In the second layer following hollow brick CS-24-1-30 W 1 hollow brick CS-24-1-30 1 L
should be placed, and after that 5 hollow bricks CS-24-1-30-W and 1 hollow brick
CS-24-1-30 1 P as well as CS-24-1-30-W 1P.
The whole forms passing hollow brick construction
shifted by half of hollow brick module CS-24-1-30-W.
- Closed steel profile is positioned after placing two hollow brick layers
- 100 x 40 x 3 or 100 x 40 x 4 into hollow brick depressions by inserting it
into vertical pole flanges and wedging
- Concrete coping hollow bricks CS-Z are fixed (with glue or mortar) on the top
part after building the screen up to desired hight
- After building the whole baffle screen its surface is painted twice with a
paint gun using special polymer-mineral paint acc. to appropiate graphical design
- Hollow bricks have to be clear of comtaminants (lubricants, glue, etc.)
prior to painting. Painting should follow directly after assembling
- Construcion poles as well as I-bars and closed steel profiles should
be protected with anticorrosion paint
- After assembling the whole screen, climbing plants should be planted on
its both sides - 1m spacing (independent with clinging plates). Back wall surface
has grooves which facilitate clinging and growth of climbers.