FI129417B - Fire stop in a pipe joint - Google Patents

Abstract

The invention relates to a pipe connection arrangement and a fire protection device (11) connected thereto. The arrangement comprises (i) a metallic main pipe (2), which is located substantially within a first fire cell (8); a plastic tube (3) located substantially within a second fire cell (9); and (iii) a pipe connection (7) between the main pipe (2) and the plastic pipe (3). A fire protection device (11) has been installed in connection with the pipe connection (7) around the plastic pipe (3) so that it has been supported in the main pipe (2) with at least one fastening device (12).

Description

BACKGROUND OF THE INVENTION The present invention relates to a pipe connection. In other words, the invention relates to a pipe connection in which a pipe inside the building, preferably a plastic pipe, is connected to a frame pipe outside the building. In particular, the invention relates to a fire break arranged around a pipe joint.

When renovating the piping inside a building, for example in connection with pipe repairs, it would often be advantageous to replace metal pipes with plastic pipes. In this case, fire safety can become a problem. The metal body pipe and the plastic pipe entering the interior are both in different fire compartments. In the event of a fire, the fire may spread from one fire compartment to another along a pipe. Since the plastic pipe is often made of a flammable material such as polyethylene or polypropylene, the pipe itself may ignite, accelerating the fire.

US-A-5105592 discloses a flame retardant arrangement in which a metal fire cuff containing a heat-expandable material is surrounded by a tube.

US-A-20180135739 describes a pipe connection surrounded by an x clamping sheath. The clamping sheath contains a fire-resistant material and an N 25 heat-insulating material.

LÖ 7 DE-A-102005048148 describes a fire protection jacket around a branch z of a plastic pipe. The jacket contains a heat-expanding material which, in the event of a fire, flattens the plastic pipe and thus prevents the fire D "i N from propagating along the pipe. O S 30

The use of fire cuffs is well known in the art. Usually the fire cuff is attached to the wall structures, for example with screws. BRIEF DESCRIPTION OF THE INVENTION The present invention comprises a fire connection of a pipe joint comprising (i) a metal body pipe (2) substantially inside the first fire compartment (8); (ii) a plastic tube (3) inside the second fire compartment (9); (iii) a pipe connection (7) between the body pipe (2) and the plastic pipe (3); and (iv) a fire protection arrangement (11) mounted in connection with the pipe connection (7) around the plastic pipe (3), the fire prevention arrangement being supported on the body pipe (2) by at least one fastener - (12), the fire protection sleeve (13) mounted around the plastic pipe (3) is supported on a bracket (12) mounted around the body tube (2) by at least one fastening element (14), wherein the at least one fastening element (14) is one or more metal rods.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a schematic view of an arrangement according to the invention. N Figure 2 shows a diagram of an arrangement according to the prior art.

N 3 25 - Fig. 3 shows a diagram of an embodiment of a fire break of a pipe connection according to the invention.

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—Detailed Description of the Invention A fire compartment refers to a space that is substantially limited to fire-resistant wall, ceiling, and floor structures.

The space is thus designed in such a way that, in the event of a fire, the fire cannot escape from the fire compartment.

In the text below, the terms “fire compartment” and “fire prevention arrangement” are - used in the same sense to describe an arrangement installed around a pipe joint to prevent the spread of fire along the pipe from one combustion chamber to another.

Trunk pipes in buildings are often made of metal, such as stainless steel.

Drainage of dwellings is often arranged in such a way that the individual - drainage outlets are connected to one or more outlet pipes, which are then connected to the trunk line.

The sewer outlets and the exhaust pipe, on the one hand, and the trunk line, on the other, are located in different fire compartments.

When renovating homes, it would often be advantageous to replace old metal pipes with plastic pipes.

However, for fire safety reasons, this has not always been possible.

Thus, old sewer pipes have been replaced with metal pipes, which has increased the cost of pipe repairs.

Figure 1 shows a schematic diagram of a pipe connection to which the solution according to the invention is applicable.

The figure shows two fire compartments, a first n fire compartment (8) and a second fire compartment (9). Between these is a partition made of fire - resistant N 25 material, such as concrete (1). The wall has an opening O (10) through which the body tube (2) is introduced from the first fire compartment (8) to the second fire compartment (9). The body pipe (2) is connected to the plastic pipe (3) z by a pipe connection (7). The opening (10) is typically sealed with fire insulation (5). = The fire insulation (5) can be any fire-insulating D NU o N 30 material known in the art, such as mineral wool. o S As stated above, the old body tube (2) is typically metal, typically cast iron, but may also be made of steel, such as stainless steel. If the old trunk pipe (2) is still in good condition, it can be left in place, in which case only the outlet pipes of the dwelling or dwellings will be replaced with plastic pipes (3). It is also possible that the body tube (2) will need to be replaced. In this case, it is preferably replaced by a new metal tube.

The diameters of the body tube (2) and the plastic tube (3) are those commonly used in the art, such as 32 mm, 75 mm, 100 mm or 150 mm.

The pipe connection (7) can be made in any way known in the art. Thus, it can be realized, for example, by flange, threaded connection or welding. A suitable connector can also be used in the connection (7).

Figure 2 shows an embodiment according to the prior art. In this embodiment, the flame retardant arrangement (11) consists of a flame retardant strip (6) wrapped around the plastic pipe (3) and a surrounding sheath (4). The jacket (4) is supported on the body tube (2) by a fastener (12), which can be, for example, a metal strap placed around the body tube (2). The jacket (4) extends over the pipe connection (7) and covers the fire retardant tape (6) wrapped around the plastic pipe (3). The fire retardant tape (6) is made of a heat-expandable material. When a fire breaks out, the expanding material is pressed against the plastic tube (3), eventually squeezing the plastic tube (3) into a pile. The function of the jacket (4) is to prevent the heat-expanding substance from expanding outwards; 25 - whereby the expanding substance compresses the plastic pipe (3) and thus prevents the fire S from propagating along the pipeline.

3 In Figure 2, the bracket (12) forms the end of the jacket (4). However, this is not necessarily the case. The bracket (12) can also be separated from the z end of the jacket (4). In this case, the jacket (4) can be supported on the bracket (12), for example with 3 30 screws or bolts. It is also possible to support the jacket (4) on the bracket S (12) by using fastening elements (14), as shown in Fig. 3.

S The jacket (4) can preferably be made of one or more, preferably two or more plates. The plate or plates are bent into the frame tube (2)

5 and around the plastic tube (3) to the desired shape and joined together. The joint or joints may be made by any known method, such as welding, riveting, or tightening. The sheath (4) is preferably made of a non-combustible material such as metal or fiberglass. Very preferably the sheath (4) is made of a metal such as iron or steel. The jacket (4) can also consist of a protective tube placed around the body tube (2) and the plastic tube (3) at the joint. According to a preferred embodiment, such a protective tube is made around the joint (7) by joining two trough-like parts together. According to another preferred embodiment, the protective tube is a tube, for example a metal tube, having an inner diameter larger than the outer diameter of the body tube and the plastic tube. The thickness of the sheath (4) is not otherwise critical, but must be sufficiently rigid to prevent the expanding material (6) from expanding outward from the tube (3). As the expandable material (6), commercially available tapes such as FS-195 (3M) or sheets such as Palusol (BASF) can be used. they are located on the side of the plastic tube (3) from the joint (7). The jacket (4) is fastened in place by means of at least one fastener (12) mounted on the body tube (2). Preferably, the at least one bracket (12) comprises means; 25 - for fastening the casing (4), for example with screws or bolts and nuts. S Alternatively, at least one fastener (12) can press the edge O of the jacket (4) against the outer surface of the body tube (2). - There can be more than one fastener (12). In this case, for example, one bracket E (12) can act as a stop when the jacket (4) is slid into place along the body tube 3 30 (2). The sheath is tightened in place on the second bracket (12).

LO = According to a preferred embodiment, the at least one fastener (12) is a collar to be tightened against the outer surface of the body tube N (2).

The distance between the outer surface of the plastic tube (3) and the jacket (4) should be large enough to allow the strips or plates of expandable material (6) to be suitably wrapped around the tube. On the other hand, the gap must not be so large that as the expanding material (6) expands, it only fills the space between the tube (3) and the jacket (4) and cannot compress the tube (3). The preferred construction is such that the strips of expandable material (6) just fill the space between the jacket (4) and the tube (3). In this case, as the material (6) expands under the influence of heat, it begins to compress the plastic tube (3) into a pile.

Figure 3 shows an embodiment according to the invention. In this embodiment, the fire prevention arrangement (11) consists of a fire sleeve (13), fastening elements (14) and a fastener (12). The fire protection sleeve (13) is mounted around the plastic pipe (3). The fire cuff (13) is an arrangement which, in the event of a fire, compresses the plastic pipe (3) into a pile. It may contain a heat-expandable substance as described above. It may also comprise a mechanical spring which, in the event of a fire, compresses the plastic tube (3) into a pile, as described in US-A-4796401. Fire cuffs are generally commercially available.

In the arrangement according to Figure 3, the bracket (12) attached to the body tube (2) may be a metal strap attached to the body tube (2) as previously described. Pipe-like fastening elements (14) are connected to the bracket (12). The fastening elements (14) extend over the pipe connection (7) around the x plastic pipe. The fire protection sleeve (13) is fastened to the N fastening elements (14) in a suitable manner. It is possible, for example, that the fastening elements (14) 3 have supports for fastening screws and nuts, with which - the fire cut-off sleeve (13) is screwed into place. In this way, the z 30 fire cuff (13) can be placed inside the second fire compartment (9).

3 The advantage of such an arrangement is that there is space around the connection tube (7) around the body tube (2) and the plastic tube (3), whereby the installation work 2 can be easily performed. One or more fasteners (12) connected to the body tube (2) allow the jacket (4) or fastening elements (14) and the fire cuff

(13) or the attachment of the fire roof strip (6) to the desired location, in which case the joint (7) need not be in the vicinity of the support structure (such as a wall). Of course, the pipe connection (7) according to the invention can also be placed in the vicinity of a wall (1) or other support structure, such as an opening (10) in the wall (1), if desired.

- The fastening elements (14) are preferably tubular rods, such as metal rods. They must be rigid enough to hold the fire cuff (13) firmly in place.

Also in this embodiment, there may be more than one fastener (12). According to a preferred embodiment, the at least one bracket (12) is to be tightened against the outer surface of the body tube (2). In Fig. 3, the pipe connection (7) and the fire break sleeve (13) are mounted on a straight part of the pipe. However, according to the invention, it is also possible for the connection (7) and the fire cut-off sleeve (13) to have a curved part, for example a 90 * curve. The pipe joint according to the present invention with its fire protection arrangements is - quick to manufacture and install. The fire protection arrangement can be manufactured on site. The arrangement is inexpensive. In addition, the arrangement according to the invention is flexible, because the arrangement does not have to be close to the finished support structure.

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Claims (5)

PATENT CLAIMS A fire cut-off for a pipe connection comprising (i) a metal body pipe (2) substantially inside the first fire compartment (8); (ii) a plastic tube (3) inside the second fire compartment (9); (iii) a pipe connection (7) between the body pipe (2) and the plastic pipe (3); and (iv) a fire protection arrangement (11) mounted around the plastic pipe (3) in connection with the pipe connection (7), the fire prevention arrangement being supported on the body pipe (2) by at least one fastener (12), the fire protection sleeve (13) mounted around the plastic pipe (3). supported on a bracket (12) mounted around the body tube (2) by means of at least one fastening element (14), characterized in that the at least one fastening element (14) is one or more metal bars. Firestop according to Claim 1, characterized in that the metal body tube (2) is made of cast iron. Fire break according to one of Claims 1 or 2, characterized in that the at least one fastener (12) is a collar tightened around the body tube (2). Firestop according to Claim 3, characterized in that the collar is made of metal. Fire outlet according to one of Claims 1 to 4, characterized in that the body pipe (2) extends inside the second fire compartment (9) and the pipe connection (7), the fire protection arrangement (11) and at least one bracket (12) are located in the second fire compartment (12). 9) inside. OF O N © <Q < O I a E LO OF LO o O OF