FI59298C - ANALYZING VID EN BRANDISOLERAD RENGOERINGSLUCKA - Google Patents

Description

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(71) Hietikko Oy, Yrttimaantie 27, 00700 Helsinki 70, Finland-Finland (FI) (72) Olavi Ensio Hietikko, Helsinki, Finland-Finland (Fl) (7 ^) Berggren Oy Ab (5M Arrangement in a fire-insulated cleaning hatch - Anordning vid en brand-isolated ringing machine

The present invention relates to an arrangement in a fire-insulated cleaning hatch for fitting to a corresponding opening in a wall of an insulated ventilation duct or the like, the hatch comprising metal outer layers spaced apart and tightening means connecting the outer layers to each other. towards each other. Such a hatch is already known, for example, from Swedish patent 111,782.

Cleaning hatches of this type are mainly used for cleaning ventilation ducts. Increasingly stringent fire safety regulations now require that ventilation ducts are fire-safe down to the cleaning hatches, ie that the wall of the ventilation duct with the hatches in it withstands high temperatures for a predetermined time.

Traditionally, the hatch with its openings is made in such a way that the opening is surrounded by Z-shaped steel in cross section, which connects the outer layers of the wall together and at the same time forms a rigid frame for the hatch. Similarly, the metal profile that formed the edge of the door is also present. However, this known arrangement is not satisfactory because the metal profiles form a well-conducting bridge through the wall of the ventilation duct and thus a fire on one side may penetrate too easily through the door.

The object of the present invention is to eliminate this problem and to provide an even more fireproof cleaning hatch in which harmful thermal bridges are eliminated. The features of the invention appear from the appended claims.

It is essential in the invention that there is a soft mineral wool insulation between the metal outer layers of the hatch so dimensioned that it is considerably thicker than the wall in the free space, so that it can be laterally expanded in a known manner by forcing the outer , which forms a frame for the hatch and against which the soft mineral wool insulation presses when the hatch is attached.

The invention and its other features are described in more detail below by way of example and with reference to the accompanying drawings, in which Figure 1 shows a cross-section of a hatch arrangement according to the invention when fitting a hatch, Figure 2 shows a top view of a hatch and Figure 3

In the figures, reference numeral 1 denotes a door cover, which is preferably a steel sheet. Number 2 means the neoprene seal around the lid and number 3 means the flexible mineral wool insulation inside the hatch.

The wall on which the hatch is placed comprises, in a known manner 59298, two outer sheet metal layers 7 and a grooved wool insulation 8 between them. The sharp sheet metal edges are protected by a metal edge 4. The lower channel inner wall layer 5 consists of two sheet metal parts first sealed to the edge of the damper 7 below.

In the free space, the hatch is thicker than the wall and its insulation 3 is held together by a film 9 running around the circumference of the insulation, which may be shrink plastic. The outer layers 1 and 5 of the door can be fastened to each other by means of bolts 10 extending through each other when the door is first compressed in the transverse direction of the wall to approximately the same thickness as the wall. The door cover 1 can be locked in place behind the nuts 11 in the bolts 10 by pivotable hooks 14. Similarly, the lower plates 5 of the door are fixed to the edge of the damper 7 on both sides by means of nuts 13 and hooks 12.

The edges of the opening are formed by a circumferential frame 6, which is a rigid mineral wool. When the door is pressed into place, the insulation 3 is compressed against this stiffer insulation 6 and provides good tightness and fire insulation. This is best seen in Figure 3. The rigid insulation 6 also prevents the wall from collapsing when the door cover 1 is tightened against the edge of the opening.

The rigid mineral wool forming the opening frame may suitably be a rock wool sheet having good mechanical strength, and the soft mineral wool forming the hatch insulation may be a sealing rock wool or the like.

It can also be mentioned that the wall does not always have to have an external metal sheet 7, but the outer surface of the duct can sometimes only be formed by the surface of the insulation 8 itself or, for example, by a metal mesh on it in a manner known per se.

In the event of a possible fire, the shrink plastic film 9 may partially or completely melt, but this does not, of course, impair the fire insulation capacity.

59298

Figure 2 shows a top view of the door with the hooks 14 closed. The number 15 denotes a handle which does not appear in Figure 1.

Example

Two air ducts with a size of 0,400 mm and 400 mm x 400 mm were installed in the test opening covered with lightweight concrete beams in the horizontal furnace. The flues were fitted with three hatches of circular cross-section of different sizes (for round flues) and two planar hatches (for square flues), all of which were structured as shown in the figures below. In the combustion test, the so-called Nordtest method NT FIRE 005, the test time was 120 min and the test hall temperature was about 18 ° C.

The test results are shown in the following table.

Flue Door type Insulation pack- Temperature

inner hatch / outer hatch mouth mm rise ° C

0 400 nm curved 300x200 / 300x300 100 124 "" 300x200 / 300x300 50 122 "" 300x400 / 500x400 100 109 400 nm x 400 nm planar 300x200 / 400x300 100 78 "" 400x300 / 500x400 100 106

Claims (4)

5 59298 An arrangement in a fire-insulated cleaning hatch for fitting to a corresponding opening in a sealingly insulated ventilation duct or the like, the hatch comprising metal outer layers (1, 5) spaced apart and tightening members (10, 11) connecting the outer layers to each other. and by means of which the outer layers can be forced in the transverse direction of the wall towards each other, characterized in that there is a soft mineral wool insulation (3) between the metal outer layers (1, 5) of the hatch so dimensioned that it is considerably thicker than the wall in the free space laterally expandable by forcing the outer layers (1, 5) of the door towards each other by means of clamping means (10, 11), and that the wall has a substantially rigid mineral wool (6) around the opening, which forms a frame for the door and against which the soft mineral wool insulation (3) presses. Arrangement according to Claim 1, characterized in that a circumferential material, for example a shrink-wrap film (9), is provided around the circumference of the door insulation (3), which keeps the insulation in size but allows it to expand laterally when the door is compressed. Arrangement according to Claim 1 or 2, characterized in that the door is arranged to be compressed to the same thickness as the wall and in such a way that the outer layers (1, 5) of the door come on the outer outer layers (7) of the wall in a manner known per se. Arrangement according to one of the preceding claims, characterized in that the second metal layer (5) of the door is arranged in a manner known per se to be tightly attached to the edge of the corresponding metal layer (7) of the wall by means (12, 13) enabling said layer (5) of the door. through the opening and pull-out opening. ·, I, · ·