FI68697B - ANALIFICATION OF VENTILATIONS AND CHANNELS - Google Patents

Description

68697 Arrangement and method for attenuating ventilation ducts in a beam element The present invention relates to an arrangement and method for attenuating ventilation ducts in a beam element. In prefabricated beam elements, parallel cavities or ducts running in the span direction are often used to branch the ventilation system in the building.

In this case, one of the cavity ducts present in the beam is connected at one end to the supply air supply duct, after which the air is further passed through the duct to an exhaust nozzle (supply air device) connected to the duct at one of its lengths or at its end. In order to provide better attenuation of the fan sound in the ventilation system-15, experiments have shown that effective attenuation can be achieved by allowing the ventilation air to circulate in two or more of the beam ducts before it is let out of the room. For this purpose, a transverse connection is required between the individual parallel ducts, so that these are connected in series for ventilation, which is then passed through the ducts in a zigzag pattern. The transverse connections are located at a distance, preferably 0.5-2.0 m, from the main barrier of the channel element.

The present invention relates to an arrangement such that the beam acts as a muffler, partly for fan sound, partly for sound which may pass from room to room (crosstalk) through a ventilation system, and a method of making suitable connections between channels in a heto-50. The invention thus consists in an arrangement in which the parallel channels are closed at their ends by means of instant plugs, which are usually cast in situ after the installation of the beam elements and have at least one connection arranged transversely between two channels located at the end of the beam element away from the ventilation air supplied to the duct. from the inlet. Thus, two or more channels can be connected in series by means of cross-connections. A plug made of a damping material, for example nine-2,6897 wool, is preferably arranged between the closure of the duct end made of concrete and the transverse connection.

The object of the present invention is to provide a solution to this problem and the characteristic features are set out in the appended claims.

The invention will be explained in more detail below with reference to the accompanying drawing figures.

Figure 1 shows two embodiments of the invention, in which the concrete slab is cut and separated into two parts.

Figure 2 shows a concrete slab seen in perspective from the end and in a third embodiment of the invention.

Figure 3 shows a longitudinal section of the concrete slab of Figure 2.

Figure 4 shows a plan section of an imaginary concrete slab, in which three of the contemplated embodiments are illustrated with a finished product.

Thus, Figure 1 shows a concrete slab 1 and this is cut so that the small piece 2 is moved to the side and frees the openings of the five channels 3,4,5,6 and 7. A connection 8 is made between the channels 20 3 and 4 so that the flat side 9 of the slab is scraped downwards into both the channel 3 and the channel 4 before the concrete has hardened.

After the scraping is completed and the concrete has hardened, the recess is covered from above with a flat side 9 of plastic mass-25a, a rubber stopper or other suitable material. The plug is shown with shading lines and marked with the number 10. The plug extends only down to the upper edge of the channels 3 and 4 and it is thus noticed that under the plug 10 a connection 8 is established between the two channels 3 and 4. See also the 30 representations of Figure 3.

Another embodiment of connecting the holes is also illustrated in Figure 1, which shows the connection between the channels 5, 6 and 7. This channel connection is provided by drilling transversely from the narrow side 11 with respect to the channels 5, 35 6 and 7 and through the channels 7 and 6 and descending into the channel 5 and then parallel to the plane side 9. In order to now have only a connection between the channels 5, 6 and 7, the hole between the sloping side 11 and the channel 17 is plugged with a plug 12 and this can be done by familiarizing the concrete slab-14q by inserting an expansion plug or the like into the hole. Concrete or plastic can also be used. This embodiment is also shown in Figure 4, as described below. Both described embodiments relate to the fact that an optional number of channels can be combined in this way, although in the first case only a connection between two channels is described and in the second case a connection between three channels is described.

Figure 2 shows a third embodiment for providing channel aggregation. It describes that the connection 10 is made between channels 3,4 and 5. In this case, the channels are required to descend to the short side 13. The connection is established such that the material between the channels 3 and 4 and the channels 4 and 5, respectively, is scraped from the short side 13 and the scraper is described by reference numeral 14. The scraper extends inwards that its cross-sectional area corresponds to the cross-sectional area of the channels. After the scraping is completed and the plate has hardened, the recess 14 is covered from the end side 13 by the plate 15 or in some other suitable way, 20 see Fig. 3. It can be seen that the channel connection 14 is closed from the end side 13 and between channels 3, 4 and 5. See also the explanation for Figure 4.

Figure 4 shows a section according to the flat side 25 of the concrete slab 1. For the purpose of describing the invention, it is shown here how the channels 3, 4, 5 and 6 are connected so that the medium flows through them in series. It is required that all channels lower to the end 16 of the plate 1, while the end 17 is completely closed. A connection 8 is made between the channels 3 and 4 according to the first embodiment described above, and thus the recess 8 is covered from the flat side with a plug or cover plate which is not shown in the section according to Fig. 4. The channels 4 and 5 are then connected according to the third embodiment described above, shown in Figures 2 and 3. The scraping has taken place from the end side 16 between the channels 4 and 5 so that a connection 14 has been made and this is covered against the end side 16. on the plate 15. Finally, the channels 5 and 6 have been connected to the channels by drilling from the long side 18, which corresponds to the drilling from side 11 in Fig. 1. In order not to communicate towards the long side, a plug 12 is placed and thus the channels 5 and 6 from the left end are connected without the medium being able to flow out through the long side 18.

The invention can be varied in many different ways and when looking at Figure 4 it can be seen, for example, that a method could have been applied to drill from the long side 18 all the way through the plate so as to provide channel connections 10 between channels 3, 4, 5 and 6. a channel connection between the optional channels so as to obtain the flow illustrated in Figure 4. A different flow can also be obtained depending on what is desired. It is further possible to make a channel connection 15 between two channels by inserting a drill or similar tool from the openings of one of the channels 3-7 and allowing it to be drilled obliquely into the adjacent channel. It is also possible to arrange closing pieces of different shapes of the channel connection made so that they extend through the channel but are closed against the channel in question, so that a pipe piece corresponding to the diameter of the channel is placed inside the channel connection.

Claims (5)

Device for sound attenuation of parallel-laid ventilation ducts (3, 4, 5, 6, 7) in concrete floor elements (1) 5, which ventilation ducts (3, 4, 5, 6, 7) at one end are connected to a supply air duct and at the other end are connected to exhaust means for the underlying space, characterized in that the sound attenuation is built into the floor covering element (1) by closing at least a pair of 10 adjacent heel ducts (3, 4; 4, 5) at the same end and are connected by only one cross connection (8; 14. so that the heel ducts of the pair are connected in series for the ventilation air to the exhaust means, the cross connections (8; 14) being located at some distance from the end connections of the channel element, preferably 0.5 - 2.0 m. 2. Device according to claim 1, characterized in that a plug (10) of sound attenuating material, e.g. of mineral wool is provided within the area between the channel end closure with concrete and the cross link (8; 14). 3. A method for receiving heel connections between longitudinally enclosed channels (J, 4, 5, 6, 7) in a concrete slab (1) during its manufacture, characterized. hence, prior to the final cure, at least some sanctity is taken from any of the side surfaces of the discs at least so deep that a channel connection (8; 14) is established between at least two adjacent channels (3, 4; 4, 5) and the channel connection (8; 14) is closed to the side surface by means of a cover plate or an adjacent concrete slab. 30 4. A method according to claim 3, characterized in that the sanctification is taken from a plane side (9) and that a cover plate is molded into the pane with the plane side (9) covering the said hollowness. 5. A method according to claim 3, characterized in that channel connections (14) are received from a narrow side (11) and are extended parallel to the major sides (9) and across the channels (5, 6, 7) after which coverage of the openings of the channels in the narrow sides (11) are performed.