JP2014150983A - Sprinkler flexible piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sprinkler flexible piping which facilitates positioning and construction, suppresses elongation at the application of pressure, can perform a pressure resistance test at production in a factory, facilitates quality management, avoids interference with a column, a wall, a ceiling or the like while keeping a piping route at the construction, and can reduce damage to fixed piping such as a water feed conduit and a sprinkler head or the like at an earthquake.SOLUTION: A sprinkler flexible piping whose one end is connected to a water feed pipe and the other end is connected to a sprinkler head is composed of: an aluminum three-layer pipe 1 having flexibility in which a synthetic resin-made inner layer 1b and a synthetic resin-made outer layer 1c are formed at the internal face side and the external face side of a cylindrical aluminum layer 1a, respectively; short-length fire protection shape holding hoses 2 connected to both ends of the aluminum three-layer pipe 1 at their base ends; a connecting metal fitting 3 arranged at a tip of one fire protection shape holding hose 2 and connected to the water feed pipe; and a head connecting metal fitting 4 arranged at a tip of the other fire protection hose 2 and connected to the sprinkler head.

Description

  The present invention is mainly used for sprinkler equipment installed in buildings such as hotels, department stores, theaters, commercial buildings, schools, hospitals, factories, warehouses, etc. In connection with improvement of sprinkler flexible piping that connects multiple sprinkler heads in a continuous manner, positioning and construction are easy, elongation at the time of pressurization is small, piping route during construction is maintained, columns and walls, The present invention relates to a flexible pipe for a sprinkler that is not buffered with a ceiling or the like, and that can reduce damage to a fixed pipe such as a water supply pipe or a sprinkler head during an earthquake.

  Generally, in buildings such as hotels and department stores, it is obliged to install sprinkler equipment in the buildings.

  When installing this sprinkler equipment, a header (multi-joint joint) is installed in a water supply pipe that is piped to the installation target section, and the header and a plurality of sprinkler heads installed on the ceiling are installed on the back of the ceiling. It was made to connect with piping for construction.

  Conventionally, as sprinkler piping used for sprinkler equipment, fixed piping (carbon steel pipe for piping), flexible bellows structure using stainless steel pipe, synthetic resin pipe such as polyethylene pipe, and metal connection fittings at both ends The attached aluminum three-layer tube was used (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, and Patent Document 4).

  However, the above-described sprinkler pipes have the following problems.

In other words, fixed piping (carbon steel pipe for piping) is difficult to position the pipe to the sprinkler head (both the horizontal position of the pipe and the vertical position of the pipe), and the construction takes time and the construction cost is high. There was a problem.
Further, since the piping is in a fixed state when an earthquake occurs, there is a problem that the fixed piping itself and the sprinkler head are easily damaged by the vibration of the earthquake.

Flexible pipes with a bellows structure using stainless steel pipes have a large elongation at the time of pressurization compared to the initial state, so they cannot be used when subjected to a pressurization test during factory production, so the quality is guaranteed only by managing the manufacturing process. There was a need to do. In addition, there was a problem that the bellows part greatly stretched during the water-flow test after construction and easily interfered with columns, walls, ceilings, and the like.
Further, it is difficult to make a long bellows-structured flexible pipe, and it is about 3.5 m at the longest.
Furthermore, the flexible pipe with the bellows structure has a problem that the pressure loss at the time of passing water is large and the pump for water supply is enlarged.

Synthetic resin pipes such as polyethylene pipes have a problem that they have a large elongation at the time of pressurization with respect to the initial state as well as flexible pipes with an accordion structure, and are easily stretched during a water passage test after construction and easily interfere with columns. there were.
Further, since the synthetic resin pipe has a large bending radius, a longer length than necessary is necessary for adjusting the angle of the end portion, and a longer synthetic resin pipe has to be used.

  The smaller the diameter of the aluminum three-layer pipe, the smaller the bending radius and the easier the piping. In this case, since flowing water friction increases, a certain diameter (inner diameter of 15 mm or more) is required. In that case, the bending radius of the aluminum three-layer pipe becomes larger and harder, so positioning becomes difficult when connecting the fittings provided at both ends during construction to the water supply pipe and the sprinkler head, There was a problem of stressing the parts.

JP-A-8-280837 JP-A-2005-27769 JP 10-118219 A JP-A-2005-185508

  The present invention has been made in view of such problems, and its purpose is easy to perform positioning and construction, little elongation at the time of pressurization, and withstand pressure test at the time of factory production, so that quality control can be performed. Sprinklers that are easy to handle, do not buffer the pillars, walls, ceilings, etc. during construction, and can reduce damage to fixed pipes such as water supply pipes and sprinkler heads during earthquakes It is to provide flexible piping.

  In order to achieve the above object, a first aspect of the present invention is a sprinkler flexible pipe having one end connected to a water supply pipe and the other end connected to a sprinkler head. The flexible pipe is composed of a flexible aluminum three-layer tube in which a synthetic resin inner layer and a synthetic resin outer layer are formed on an inner surface side and an outer surface side of a cylindrical aluminum layer, respectively, and a base end portion is made of aluminum 3 A short fire-fighting shape hose connected to both ends of the layer pipe, a connection fitting to be connected to the water supply pipe at the tip of one fire-fighting shape hose, and the other fire-fighting shape hose And a head connection fitting connected to the sprinkler head.

  The invention according to claim 2 of the present invention is the invention according to claim 1, wherein the end of the aluminum three-layer tube and the base end of the fire retaining shape hose are externally fitted to a cylindrical tube expansion nipple. The end of the aluminum three-layer pipe and the base end of the fire-resistant shape hose are caulked and fixed to the pipe nipple by one cylindrical caulking, and the base end of the aluminum three-layer pipe and the base shape of the fire-resistant shape hose In addition, the inner diameter of the pipe nipple and the inner diameter of the aluminum three-layer pipe are made equal to reduce the flowing water friction resistance.

  The flexible pipe for a sprinkler of the present invention has a short fire-fighting shape holding hose connected to both ends of a flexible aluminum three-layer pipe, and is connected to a water supply pipe at the tip of one fire-fighting shape holding hose. In addition to providing a connecting fitting that is connected to the sprinkler head at the tip of the other fire-fighting shape hose, the required diameter of the aluminum three-layer tube is secured, and the three-layer aluminum Even if the bending radius of the pipe becomes larger and harder, it can absorb that the bending becomes hard due to the softness of the fire retaining hose connected to both ends of the aluminum three-layer pipe. Is extremely easy to do.

  In addition, the flexible pipe for sprinklers of the present invention is formed of an aluminum three-layer pipe and a fire-fighting shape retaining hose, so there is little elongation at the time of pressurization, a pressure test can be performed during factory production, and quality control is easy. Yes, the piping route during construction is maintained, and it cannot be said that the pillar, wall, ceiling, etc. are buffered.

  Furthermore, the flexible pipe for sprinklers of the present invention reduces damage to fixed pipes such as water supply pipes and sprinkler heads during an earthquake due to the bendability of the aluminum three-layer pipe and the softness of the fire retaining shape hose. be able to.

  In addition, the sprinkler flexible pipe of the present invention is such that the end of the aluminum three-layer pipe and the base end of the fire retaining shape hose are externally fitted to a cylindrical expansion nipple, and the aluminum three layer pipe and the fire retaining shape hose are provided. By caulking a cylindrical caulking ring fitted on the outside of the end, the end of the aluminum three-layer pipe and the base end of the fire-fighting shape retaining hose are connected. Connection with fire-fighting shape hose can be done easily and easily.

  In addition, since the flexible pipe for a sprinkler according to the present invention has the same inner diameter of the expanded nipple and the inner diameter of the aluminum three-layer pipe, the flowing water friction resistance is reduced and water can be smoothly passed.

It is a partial abbreviation sectional view of flexible piping for sprinklers concerning an embodiment of the present invention. It is an expanded sectional view of the connection part of the aluminum three-layer pipe of the flexible piping for sprinklers, and the shape retention hose for fire fighting. It is an expanded sectional view which shows the other example of the connection part of the aluminum 3 layer pipe and the shape retention hose for fire fighting. It is an expanded sectional view which shows the further another example of the connection part of the aluminum 3 layer pipe and the shape retention hose for fire fighting. It is an expanded sectional view which shows the further another example of the connection part of the aluminum 3 layer pipe and the shape retention hose for fire fighting. It is an expanded sectional view of the one end part (water supply pipe side) of flexible piping for sprinklers. It is an expanded sectional view of the other end part (sprinkler head side) of flexible piping for sprinklers.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a sprinkler flexible pipe according to an embodiment of the present invention. The sprinkler flexible pipe is connected to a water supply pipe (not shown) whose one end is piped on the ceiling of a building, and the other end is It is connected to a sprinkler head (not shown) installed on the ceiling, and allows water to flow from the water supply pipe to the sprinkler head.

  That is, the flexible pipe for sprinkler is composed of an aluminum three-layer pipe 1 having flexibility, a short fire-fighting shape holding hose 2 connected to both ends of the aluminum three-layer pipe 1, and one fire-fighting shape holding hose. 2 is connected to a header or a branch pipe (both not shown) provided on a water supply pipe through a threaded joint 5 and the tip of the other fire-fighting hose 2 And a head connection fitting 4 connected to the sprinkler head.

Specifically, as shown in FIG. 2, the aluminum three-layer tube 1 is formed with an inner layer 1b made of electron-crosslinked polyethylene on the inner surface side of a thin-walled cylindrical aluminum layer 1a and at the outer surface side of the aluminum layer 1a. An outer layer 1c made of density polyethylene is formed, and the aluminum layer 1a and the inner layer 1b, and the aluminum layer 1a and the outer layer 1c are bonded to each other by an adhesive resin layer made of adhesive polyolefin.
The aluminum three-layer tube 1 has an inner layer 1b made of electron-crosslinked polyethylene on the inner surface side of the aluminum layer 1a, and an outer layer 1c made of high-density polyethylene on the outer surface side of the aluminum layer 1a. Corrosion resistance and the like are increased, and necessary flexibility can be obtained when the pipe is bent, and the pipe can be bent without being buckled.

  In this embodiment, the aluminum three-layer tube 1 has a nominal diameter of 20 mm, an outer diameter of 26.0 mm, a tube thickness of 4.00 mm, an inner diameter range of 17.5 mm to 18.4 mm, an aluminum layer 1a thickness of 0.2 mm, An aluminum three-layer tube 1 having a length of several tens of centimeters to twenty tens of meters and a weight of 0.31 kgf / m is used.

The short fire-preserving hose 2 includes a jacket formed by weaving a synthetic fiber warp (warp) and a synthetic fiber weft in a cylindrical shape, and a synthetic resin lined on the inner peripheral surface of the jacket. And a cylindrical lining layer made of rubber or rubber.
Here, the short length means that when the flexible pipe for sprinklers is piped on the back of the ceiling of the building, the fire retaining shape hose 2 can be bent freely in any direction and provided at the tip of the fire retaining shape hose 2. This is the minimum length required to connect the connecting fitting 3 or the head connecting fitting 4 to the water supply pipe or the sprinkler head, and indicates a length of about 100 mm to 500 mm.

  The jacket uses a plurality of polyester yarns (for example, polyester fiber yarns or polyester monofilament yarns) excellent in durability as warp yarns, and a single polyester yarn (eg, polyester yarns excellent in durability as weft yarns) , Polyester fiber yarn), and is formed by weaving the warp and weft into a cylindrical shape. In this embodiment, the jacket has a cylindrical twill structure.

On the other hand, the lining layer is formed by lining a lining material made of a polyurethane resin, which is excellent in chemical resistance and light and tough, on the inner peripheral surface of the jacket.
The thickness of the lining layer is set as thin as possible so as not to impair the flexibility and flexibility of the jacket within a range in which the jacket can be sealed.

  In this embodiment, the fire-resistant shape retaining hose 2 manufactured by Yokoi Seisakusho Co., Ltd., having a length of 100 mm to 500 mm and a diameter of 20A, is used.

In the above embodiment, the shape retaining hose jacket has a cylindrical twill structure, but in other embodiments, the jacket may have a cylindrical plain weave structure.
In the above embodiment, one type of weft is used as the weft. However, in other embodiments, two types of weft may be used.

  As shown in FIG. 2, the aluminum three-layer pipe 1 and the fire-fighting shape holding hose 2 are formed by connecting the end of the aluminum three-layer pipe 1 and the base end portion of the fire-fighting shape holding hose 2 to both ends of the cylindrical tube expansion nipple 6. By crimping two cylindrical caulking rings 7 and 7 'respectively fitted on the outer side of the aluminum three-layer pipe 1 and on the outer side of the base end of the fire retaining shape hose 2 respectively. They are connected in an airtight state and in communication.

The pipe nipple 6 is formed of a metal material (for example, brass) in the form of a short tube with an outer peripheral surface, and the inner diameter thereof is formed to be equal to the inner diameter of the aluminum three-layer pipe 1. Before inserting 6 into the end of the aluminum three-layer tube 1, the inner diameter of the aluminum three-layer tube 1 is expanded and inserted.
Further, the outer diameter of the large diameter portion of the pipe expansion nipple 6 is set to be substantially the same as the inner diameter of the fire retaining shape hose 2.
Further, flanges 6 a are formed on the outer peripheral surface of the intermediate portion of the pipe expansion nipple 6, and the outer peripheral surfaces of both ends of the pipe expansion nipple 6 are the end of the aluminum three-layer pipe 1 and the base end of the fire retaining shape hose 2. Each part is formed in the shape of a bamboo shoot so that it is difficult to remove.
An annular protrusion 6b for retaining is formed at the outer peripheral surface end of the small diameter portion of the tube expansion nipple 6 to which the end of the aluminum three-layer tube 1 is fitted.

The two caulking rings 7 and 7 'are formed of a metal material (for example, aluminum) into a cylindrical shape slightly longer than the lengths of the small diameter side and the large diameter side of the pipe expansion nipple 6.
The inner diameters of the caulking rings 7 and 7 ′ are set to such an extent that they can be easily fitted on the end of the aluminum three-layer tube 1 and the base end of the fire retaining shape hose 2.

  The two caulking rings 7 and 7 'described above can be integrated, and the aluminum three-layer pipe 1 and the fire retaining shape hose 2 can be caulked with one caulking ring 7' 'as shown in FIGS. .

  FIG. 3 is an enlarged cross-sectional view showing another example of the connecting portion between the aluminum three-layer pipe 1 and the fire-fighting shape retaining hose 2. The end of the aluminum three-layer pipe 1 and the fire fighting are formed on the outer peripheral surface of the tubular pipe expansion nipple 6. Aluminum is obtained by caulking one cylindrical caulking ring 7 ″ fitted outside the base end portion of the fire-fighting shape retention hose 2 in order with the base end portion of the shape retention hose 2 being overlapped one after another. The end of the three-layer tube 1 and the base end of the fire-fighting shape retaining hose 2 are connected in an airtight state and in a continuous manner.

The tube expansion nipple 6 shown in FIG. 3 is formed in a short cylindrical shape with a metal material (for example, brass), and has an inner diameter equal to the inner diameter of the aluminum three-layer tube 1.
Further, a flange 6 a is formed on the outer peripheral surface of one end of the tube expansion nipple 6, and an annular protrusion 6 b for preventing the removal is formed on the outer peripheral surface of the other end of the tube expansion nipple 6.

On the other hand, the caulking ring 7 ′ shown in FIG. 3 is formed in a cylindrical shape slightly longer than the length of the pipe nipple 6 by a metal material (for example, aluminum). Two annular protrusions 7a facing the surface are formed.
The inner diameter of the caulking ring 7 ″ is set to such an extent that it can be easily fitted on the base end of the fire retaining shape hose 2.

  FIG. 4 is an enlarged cross-sectional view showing still another example of the connection portion between the aluminum three-layer tube 1 and the fire-fighting shape retaining hose 2. Ends were fitted to both ends of the tubular tube expansion nipple 6 in a butted state, and fitted so as to straddle the outer side of the end of the aluminum three-layer tube 1 and the outer side of the base end of the fire retaining shape hose 2. By caulking one cylindrical caulking ring 7 ″, the end of the aluminum three-layer tube 1 and the base end of the fire-fighting shape retaining hose 2 are connected in an airtight state and in a continuous manner.

The pipe nipple 6 shown in FIG. 4 is formed of a metal material (for example, brass) in a short cylindrical shape with an outer peripheral surface, and its inner diameter is formed to be equal to the inner diameter of the aluminum three-layer tube 1. .
Further, the outer peripheral surfaces of both ends of the pipe expansion nipple 6 are formed in the shape of bamboo so that the end of the aluminum three-layer pipe 1 and the base end of the fire retaining shape hose 2 are difficult to be removed, and the outer periphery of the small diameter portion. An annular protrusion 6b is formed at the surface end.

On the other hand, the caulking ring 7 ″ shown in FIG. 4 is formed in a cylindrical shape slightly longer than the length of the tube expansion nipple 6 by a metal material (for example, aluminum).
The inner diameter of the caulking ring 7 ″ is set to such an extent that it can be easily fitted on the end of the aluminum three-layer tube 1 and the base end of the fire retaining shape hose 2.

  FIG. 5 is an enlarged cross-sectional view showing still another example of the connection portion between the aluminum three-layer tube 1 and the fire-fighting shape retaining hose 2. Ends were fitted to both ends of the tubular tube expansion nipple 6 in a butted state, and fitted so as to straddle the outer side of the end of the aluminum three-layer tube 1 and the outer side of the base end of the fire retaining shape hose 2. By caulking one cylindrical caulking ring 7 ″, the end of the aluminum three-layer tube 1 and the base end of the fire-fighting shape retaining hose 2 are connected in an airtight state and in a continuous manner.

The pipe nipple 6 shown in FIG. 5 is formed into a short cylindrical shape with a stepped outer peripheral surface made of a metal material (for example, brass), and the inner diameter thereof is formed to be equal to the inner diameter of the aluminum three-layer pipe 1. .
In addition, an annular protrusion 6a is formed on the outer peripheral surface end portion of the small diameter portion of the tube expansion nipple 6 to which the end portion of the aluminum three-layer tube 1 is fitted, and the shape retaining hose 2 for fire fighting is provided. Two annular grooves 6c are formed on the outer peripheral surface of the large-diameter portion of the tube expansion nipple 6 to which the base end portion is fitted.

On the other hand, the caulking ring 7 shown in FIG. 5 is formed in a cylindrical shape slightly longer than the length of the tube expansion nipple 6 by a metal material (for example, aluminum), and a small diameter portion of the tube expansion nipple 6 is formed on the inner peripheral surface thereof. The two annular protrusions 7a that face the outer peripheral surface of the tube and the two annular protrusions 7a that face the two annular grooves 6c in the large diameter portion of the pipe expansion nipple 6 are formed.
The inner diameter of the caulking ring 7 is set to such an extent that it can be easily fitted on the end of the aluminum three-layer tube 1 and the end of the fire retaining shape hose 2.

  Then, as shown in FIG. 3, a connection fitting 3 connected to a header or branch pipe provided on the water supply pipe is attached to the distal end portion of one fire-fighting shape holding hose 2 via a screw joint 5. In addition, as shown in FIG. 4, a head connection fitting 4 connected to the sprinkler head is attached to the distal end portion of the other fire-fighting shape holding hose 2 via a screw joint 5.

  The connection fitting 3 is formed in a cylindrical shape in which male screws 3a are formed on the outer peripheral surfaces of both ends by a metal material (for example, steel material or brass). In this embodiment, a nipple fitting is used for the connection fitting 3.

  The head fitting 4 is formed of a metal material (for example, steel or brass) in a straight cylindrical shape in which a male screw 4a is formed on the outer peripheral surface of the base end portion and a female screw 4b is formed on the inner peripheral surface of the tip end portion. Yes.

  The threaded joint 5 has an outer peripheral surface at one end formed in a bamboo stalk shape and is inserted into the distal end portion of the fire-fighting shape retaining hose 2, and has a locking flange 5 a ′ at the outer peripheral edge at the other end portion. A cylindrical insertion fitting 5 'and one end of which is externally fitted to the outer peripheral surface of the other end of the insertion fitting 5' so as to be rotatable and movable in the axial direction. Alternatively, it is composed of a female screw fitting 5 ″ having a cap nut structure formed with a female screw 5a ″ that is detachably screwed to the male screw 4a of the head connection fitting 4.

  This threaded joint 5 has a cylindrical second caulking ring that is inserted into the base end portion of the fire-fighting shape retaining hose 2 at one end of the fitting 5 ′ and fitted on the outside of the tip end portion of the fire-fighting shape retaining hose 2. By caulking 8 (made of aluminum), it is connected in an airtight and continuous manner to the tip of the fire retaining shape hose 2.

  Further, the packing 9 is inserted into the female screw fitting 5 ″ of the threaded joint 5, and the female screw 5 a ″ of the female screw fitting 5 ″ is connected to one male screw 3 a of the connection fitting 3 or the male screw 4 a of the head connection fitting 4. When the female screw fitting 5 ″ is tightened to the connection fitting 3 side or the head connection fitting 4 side, the inner peripheral edge of one end of the female screw fitting 5 ″ is the locking flange 5a ′ of the insertion fitting 5 ′. And the insertion fitting 5 'is pressed against the connection fitting 3 side or the head connection fitting 4 side. As a result, the packing 9 is formed by the end face of the insertion fitting 5' and the end face of the connection fitting 3 or the end face of the head connection fitting 4. It is clamped and closely adhered, and the sealing of the connecting portion is performed satisfactorily and reliably.

  Thus, in the above-described flexible pipe for sprinkler, the connection fitting 3 is connected to the header provided on the water supply pipe on the back of the ceiling piped up to the section to be installed, and the sprinkler head installed on the ceiling. By connecting the head connection bracket 4, piping is made on the ceiling of the building.

In this sprinkler flexible pipe, a short fire-fighting shape holding hose 2 is connected to both ends of the aluminum three-layer pipe 1, and a connection fitting is connected to the water supply pipe at the tip of one fire-fighting shape holding hose 2. 3 and the head connecting bracket 4 connected to the sprinkler head at the tip of the other fire-fighting shape retaining hose 2 is provided. Even if the bending radius of the tube 1 becomes larger and harder, it can absorb that the bending becomes hard due to the softness of the fire retaining shape hose 2 connected to both ends of the aluminum three-layer tube 1, Positioning and construction are extremely easy.
In addition, the flexible pipe for sprinklers is formed with the aluminum three-layer pipe 1 and the fire-fighting shape retaining hose 2, so there is little elongation at the time of pressurization. Yes, the piping route during construction is maintained, and it cannot be said that the pillar, wall, ceiling, etc. are buffered.
Furthermore, this flexible pipe for sprinklers can reduce damage to fixed pipes such as water supply pipes and sprinkler heads during an earthquake due to the bendability of the aluminum three-layer pipe 1 and the softness of the fire retaining shape hose 2. .

In the above embodiment, the connection fitting 3 or the head connection fitting 4 is attached to the end of the fire retaining shape hose 2 via the screw joint 5, but in other embodiments, May omit the screw-type joint 5 and attach the connection fitting 3 or the head connection fitting 4 directly to the end of the fire retaining shape hose 2.
Further, the shapes and structures of the connection fitting 3 and the head connection fitting 4 are not limited to those of the above embodiment, and any shape and structure can be used as long as they can be connected to the water supply pipe and the sprinkler head. May be.

  1 is an aluminum three-layer tube, 1a is an aluminum layer, 1b is an inner layer, 1c is an outer layer, 2 is a fire retaining shape hose, 3 is a connection fitting, 3a is a male screw of the connection fitting, 4 is a head connection fitting, 4a is a head Male screw for connection fitting, 4b for female screw for head connection fitting, 5 for threaded joint, 5 'for insertion fitting, 5a' for locking flange, 5 "for female screw fitting, 5a" for female screw fitting Screws 6 are expanded nipples, 6a are annular protrusions, 6b are annular grooves, 7, 7 'are caulking, 7 "is an integral caulking, 8 is second caulking, and 9 is packing.

Claims (2)

  A sprinkler flexible pipe having one end connected to a water supply pipe and the other end connected to a sprinkler head. The sprinkler flexible pipe includes an inner surface side and an outer surface side of a cylindrical aluminum layer (1a). And a flexible aluminum three-layer tube (1) having a synthetic resin inner layer (1b) and a synthetic resin outer layer (1c), respectively, and a base end portion of the aluminum three-layer tube (1). A short fire-fighting shape holding hose (2) connected to both ends, a connection fitting (3) provided at the tip of one fire-fighting shape holding hose (2) and connected to the water supply pipe, and the other A sprinkler flexible pipe comprising a head connection fitting (4) provided at a tip of a fire-fighting shape retaining hose (2) and connected to a sprinkler head.   The end portion of the aluminum three-layer pipe (1) and the base end portion of the fire-fighting shape retaining hose (2) are externally fitted to a cylindrical tube expansion nipple (6), and at least one cylindrical caulking ring (7),. By caulking and fixing the end of the aluminum 3-layer pipe (1) and the base end of the fire-resistant shape hose (2) to the expanded nipple (6), the end of the aluminum 3-layer pipe (1) and the shape-keeping shape for fire fighting 2. The flowing water frictional resistance is reduced by connecting the base end portion of the hose (2) and making the inner diameter of the pipe expansion nipple (6) equal to the inner diameter of the aluminum three-layer pipe (1). Flexible piping for sprinklers.

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