JP2012110487A - Piping for sprinkler - Google Patents

Abstract

The present invention provides a sprinkler pipe provided with an unwinding pipe that facilitates mounting work to a head mounting pipe without impairing the water supply function in the event of a fire.
A water supply main pipe, a plurality of auxiliary pipes branched from the main pipe, a head mounting pipe provided with a sprinkler head installed on the ceiling, and one or more multi-ports provided in each of the auxiliary pipes. In a sprinkler pipe comprising a unwinding pipe 16 made of a crosslinked polyethylene pipe that connects the joint and the head mounting pipe 14, a part 21a of the unwinding pipe 16 connected to the head mounting pipe 14 on the head mounting pipe side is provided. The diameter is made smaller than that of the other part 21 and the length of the part 21a is made equal to or less than the sprinkling distance sprayed from the sprinkler head 13. The said part 21a is protected by watering at the time of a fire, a temperature rise is restrict | limited, it is hard to melt | dissolve to the inside, and a water supply function is maintained.
[Selection] Figure 4

Description

  The present invention relates to a sprinkler pipe to be piped on the back of a ceiling.

  Sprinkler piping generally includes a water supply main pipe, an unwind pipe connected to the main pipe via an auxiliary pipe or a header, and a sprinkler head installed on the ceiling, and is connected to the pipe end of the unwind pipe. In recent years, resin pipes such as cross-linked polyethylene pipes have been frequently used for unwinding pipes due to revisions to the Fire Service Act.

  FIG. 1 shows an example of a sprinkler pipe disclosed in Patent Document 1, a water supply main pipe 1, a header 2 connected to the main pipe 1, and a sprinkler head installed on a ceiling 8 (FIG. 2). 2 and a unwinding pipe 5 made of a cross-linked polyethylene pipe for connecting the header 2 and the head mounting pipe 4, and the head mounting pipe 4 has a metal part as shown in FIG. An elbow joint shape is formed by insert molding 4a, and is supported by a metal fitting 4 on the slab 6 by a metal portion 4a.

JP-A-10-118219

  If a resin pipe is used for the unwinding pipe, the unwinding pipe should be placed on the back of the ceiling as it is, and it is not necessary to support it with a hanging bracket on the building frame like a metal pipe. In this case, other pipes on the back of the ceiling, such as water supply / hot water supply pipes, miscellaneous water distribution pipes, sewage pipes, air conditioning ducts, rack pipes for electric cables, etc. can be bypassed or connected to the head mounting pipes mounted on the ceiling. However, resin pipes are generally used as metal pipes, while dimensional measurement, pipe cutting, threading, and screwing work are necessary for the connection work using elbow joints. Compared with flexibility, it is possible to change the direction without using an elbow joint. Therefore, there is an advantage that construction is easy due to the fact that the above-described operation is not necessary as in the case of using an elbow joint. But there was a fire It can, in order to be able watering sprinkler head, the unwinding tube, to medium high fever is easily melted No such heat resistance is required.

  Therefore, in the past, a large-diameter tube having a thickness that does not melt easily to the inside has been used for the unwinding tube. However, a large-wall tube having a large diameter has high rigidity and is difficult to bend. There was a dislike that the mounting work to the mounting pipe was not easy.

  An object of this invention is to provide the sprinkler piping provided with the unwinding pipe | tube which makes easy the attachment operation | work to a head attachment pipe | tube, without impairing the water supply function at the time of a fire.

  The invention according to claim 1 includes a water supply main pipe, a flexible resin unwinding pipe connected to the main pipe via an auxiliary pipe or a header, and a sprinkler head installed on the ceiling. The sprinkler pipe is connected to the head end of the unwinding pipe, and the unwinding pipe is connected to the head mounting pipe on the head mounting pipe side of the total length. A part of the head attachment pipe is formed to have a lower rigidity than the other part, and a part of the head attachment pipe side is set to have a length equal to or shorter than a sprinkling distance from the sprinkler head.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, a part of the unwinding pipe having a small rigidity is smaller in diameter than the other part,
The invention according to claim 3 is the invention according to claim 1 or 2, characterized in that it is formed of a material having a lower hardness than a part or other part of the unwinding pipe having a small rigidity.

  According to the invention relating to claim 1, since the unwinding pipe has a part of the sprinkler head side which is less rigid than the other part, it is rich in flexibility and can be easily attached to the head mounting pipe. Even if the rigidity is small, the specified amount of water can be secured, and since the part of the unwinding pipe is within the watering range from the sprinkler head, it is protected by watering in the event of a fire and is not easily melted to the inside, and the water supply function can be maintained. It has effects such as.

  If a part of the unwinding tube is configured as in the inventions according to claims 2 and 3, the rigidity of the unwinding tube can be lowered.

Schematic of sprinkler piping. The front view which shows a part of unwinding pipe connected to a head attachment pipe. Schematic of another example of piping for sprinklers. The front view which shows a part of unwinding pipe | tube concerning this invention connected to a head attachment pipe | tube. Sectional drawing of another example of a part of the unwinding pipe.

  Hereinafter, piping for sprinklers according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the same structural parts as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  FIG. 1 is an example of a sprinkler pipe to which the present invention is applied, and FIG. 3 shows another example. The sprinkler pipe of this example branches from a water supply main pipe 11 and the main pipe 11. A plurality of auxiliary pipes 12, a head mounting pipe 14 provided with a sprinkler head 13 installed on the ceiling, one or more multi-joints 15 (may be headers) provided in each of the auxiliary pipes 12, and the head mounting pipe 14 and an unwinding pipe 16 made of a crosslinked polyethylene pipe.

  The sprinkler pipe to which the present invention is applied is not limited to those illustrated in FIGS. 1 and 3, and is made of a flexible resin connected to the main water supply pipe and the main pipe via an auxiliary pipe or a header. Any structure of the unwinding pipe and the sprinkler head installed on the ceiling and having a sprinkler pipe comprising a head mounting pipe connected to the pipe end of the unwinding pipe Good.

  The unwinding tube is not limited to the one made of the above-described crosslinked polyethylene, and for example, a two-layer crosslinked polyethylene tube whose inner layer is made of crosslinked polyethylene and an outer layer made of non-crosslinked polyethylene, a simple polyethylene tube or a polybutene tube can be used.

  FIG. 4 shows the unwinding tube 21 connected to the head mounting tubes 4 and 14 corresponding to FIG. 2 in the sprinkler piping shown in FIGS. 1 and 3, and the unwinding tube 21 is a head mounting tube. A part 21a connected to the head mounting pipes 4 and 14 on the side is made smaller in diameter, has a smaller rigidity than the other parts 21, and is easily bent.

  The length of the part 21a is set to be within a watering range sprayed from the sprinkler head 13, that is, a watering distance or less, and is protected by watering in the event of a fire, so that the temperature rise is limited and it is difficult to melt to the inside. Thus, the water supply function can be maintained.

  The present inventors conducted a water discharge experiment on a 20-mmφ double-layer cross-linked polyethylene pipe with a part length of 200 cm from the end being 16 mmφ. As a result, the specified water discharge amount of 80 l / min could be secured, and 20 mmφ The amount of water discharged was almost the same as that of the two-layer crosslinked polyethylene pipe.

  In the unwinding tube 23 of another embodiment shown in FIG. 5, the length of the part 23a from the end is made of a material having a lower hardness than the other part (which may be the same material or a different material). The rigidity is reduced.

  In order to make the rigidity of a part of the unwinding tube smaller than the other part, in addition to the above means, a part of the wall thickness may be made thinner than the other part. You may combine a means.

1, 11 .. Water supply pipe 2.. Header 3, 13.. Sprinkler head 4, 14... Head mounting pipe 5, 16, 21, 23.・ Auxiliary pipe 15

Claims (3)

  A main pipe for water supply; a flexible resin unwinding pipe connected to the main pipe via an auxiliary pipe or a header; and a sprinkler head installed on the ceiling, the pipe end of the unwinding pipe In the sprinkler piping that is connected to the head and is piped to the back of the ceiling, the unwinding tube is part of the total length that is connected to the head mounting tube on the side of the head mounting tube. A sprinkler pipe characterized in that the rigidity is formed to be small, and a part of the head mounting pipe side is set to a length equal to or shorter than a sprinkling distance from the sprinkler head.   A sprinkler pipe, wherein a part of the unwinding pipe having a small rigidity has a smaller diameter than the other part.   The sprinkler pipe according to claim 1 or 2, wherein the sprinkler pipe is formed of a material having a lower hardness than a part or other part of the unwinding pipe having a small rigidity.