JP2020118265A - Piping member and piping facility using the same - Google Patents

Abstract

To provide a piping member that can improve workability in construction of a piping facility by machining a connection part in advance with respect to an existing piping member, and a piping facility using the piping member.SOLUTION: A piping member for guiding and/or sealing fluid such as liquid, gas or powder, is formed by using a standardized piping member comprising one or more cylindrical pipe portions. At least one end part or both end parts in the length direction of the pipe portion is provided with a connection part for connecting in series to another piping member. The connection part is formed in which the outer peripheral surface of the pipe portion is reduced to a size such that it can be inserted into a hole part of another piping member to be connected.SELECTED DRAWING: Figure 1

Description

The present invention relates to a piping member used for guiding and/or sealing a fluid such as liquid, gas or powder, and piping equipment using the piping member.

BACKGROUND ART Conventionally, piping equipment has been used to guide and/or seal fluid such as liquid, gas or powder, and in order to construct this piping equipment, piping members such as pipes, pipe joints and elbows are used. ing. Most of such piping equipment is composed of pipes, and various members are used for connecting, branching, and joining the pipes.

Conventionally, various piping members such as pipes and pipe joints have been provided using resins such as vinyl chloride and metals such as iron, aluminum, and stainless steel. The piping member of is used. The pipe member has its outer diameter, length, etc. defined in the JIS standard and the like, which improves the ease of connection in piping equipment.

Several prior arts have been proposed for a pipe connection structure in such a piping facility. For example, in the past, steel pipes were connected by a welding method or a bolt at a work site. Therefore, in Patent Document 1 (JP-A-11-50449), it is easy to connect steel pipes. As a method of connecting steel pipes that can significantly reduce the work time in the field and has good adhesiveness, the first steel pipe and the second steel pipe are connected at their steel pipe ends through hollow joint steel pipes. As a method of connecting steel pipes, a method of connecting steel pipes has been proposed in which a gap between the steel pipe and the joint steel pipe is filled with an acrylic adhesive to connect the pipes.

Further, in Patent Document 2 (Japanese Patent Laid-Open No. 8-75072), with respect to a vinyl chloride pipe, an end portion of a first vinyl chloride pipe is inserted into an end portion of a second vinyl chloride pipe and fitted, or a first chloride An end portion of the vinyl pipe is inserted and fitted into one end portion of the joint, and an end portion of the second vinyl chloride pipe is inserted and fitted into the other end portion of the joint, and an adhesive is provided between the fitting surfaces. It is disclosed that they are used as a water supply pipe, a hot water supply pipe, a drainage pipe, and the like by interposing and joining.

In Patent Document 3 (Japanese Patent Laid-Open No. 2003-194268), a long-life piping application that can be applied to a general stainless steel pipe, has a simple structure, and can be joined with a general tool such as a wrench without a special jig. In order to provide a mechanical fitting for, a stainless ferrule is placed between the stainless steel pipe and the stainless nipple, and the stainless ferrule is pressed and deformed by the stainless nut that is screwed into the stainless nipple. A stainless steel pipe fitting is proposed.

Japanese Patent Laid-Open No. 11-50449 JP-A-8-75072 JP, 2003-194268, A

However, in the above-mentioned conventional piping equipment, in order to connect the pipes to each other, a separate connecting member is required, and it is difficult to connect the pipes. Further, when constructing a piping facility or the like using steel pipes, it is necessary to perform welding or screw fixing at the work site, which has been a problem in improving workability. Then, this invention makes it a subject to provide the piping member which improved the workability at the time of the piping equipment construction by processing a connection part with respect to the existing piping member beforehand, and the piping equipment using this. ..

In order to solve the above problems, in the present invention, a pipe portion of a standardized and provided pipe member is used, and by processing the end portion thereof, a connecting portion for connecting the pipe members is formed. The above-mentioned piping member and piping equipment using this are provided.

That is, in the present invention, a piping member that guides and/or seals a fluid such as a liquid, a gas, or a powder, and is formed by using a standardized piping member that includes one or more tubular pipe portions. Is provided, at least one end portion or both end portions in the length direction of the pipe portion is provided with a connecting portion for connecting in series to another piping member, and the connecting portion is Provided is a piping member in which an outer peripheral surface of a pipe portion is reduced in diameter so as to be inserted into a hole of another piping member to be connected.

Such a piping member may be a pipe (pipe), a pipe joint for connecting the pipe or the like, or a bending member (elbow, etc.) for changing the direction of the pipe. A member for guiding and/or sealing a fluid such as powder is included. In particular, when the piping member is a pipe, it can be a pipe having a connecting portion at one end or both ends in the length direction. Since such a pipe can be connected to another piping member (such as a pipe) by the connecting portion, the pipe can be connected without requiring a member for connecting the piping members such as pipes.

The piping member may be made of metal such as stainless steel or iron, or resin such as vinyl chloride or silicon. Therefore, when the piping member is a pipe, it may be a steel pipe, a stainless pipe, an aluminum pipe, a copper pipe, a zinc pipe, a vinyl chloride pipe, a silicon pipe, or the like.

The connecting portion is formed by reducing the diameter of the outer peripheral surface of the pipe portion of the pipe member to a size such that it can be inserted into the hole of another pipe member to be connected. Such a connecting portion can be reduced in diameter by crimping the pipe portion and by cutting the outer peripheral surface. Further, the diameter can be reduced by etching or melting with a chemical product. Therefore, the connecting portion can be formed thinner than the other portion (that is, the portion where the connecting portion is not formed), and in this case, the pipe member (for example, the pipe member) in which the connecting portion has a small thickness is formed. ) Can be. The degree of diameter reduction in the connecting portion is not particularly limited, but in consideration of the ease of insertion into the holes of other piping members, the rattling after insertion, etc., it is 1. The outer diameter can be formed small in the range of 0 or more and 4.0 mm or less. Further, the length (axial length) of the connecting portion can be appropriately set in consideration of the length, the thickness, the mass, the material, etc. of the members to be connected, but the connecting portion can be formed by another piping member. When it is fixed with an adhesive after being inserted into the hole, it can be formed with a thickness of 1 mm or more and 60 mm or less in order to secure a coating margin of the adhesive.

Further, the piping member is used for guiding and/or sealing a fluid such as liquid, gas or powder. Liquids include water such as tap water, sewage, and fire extinguishing water, as well as oil, gas includes air, inert gas and fuel gas, and powders are fluid powders and particles. Including the body. Therefore, the piping member can be used when constructing water supply and sewerage piping equipment, fire extinguishing water piping equipment, air conditioning piping equipment, fuel gas piping equipment, inert gas piping equipment, powder transfer equipment and the like.

In the embodiment of the piping member of the present invention, the connecting portion is formed by gradually reducing the diameter toward the end portion side of the pipe portion, the maximum outer diameter of the connecting portion, the connecting portion is It can be formed to be the same as the inner diameter of the hole of the other piping member to be inserted, or small in the range of 0.1 mm or more and 3.0 mm or less, preferably 0.2 mm or more and 0.5 mm or less. .. Such a connecting portion can be reduced in diameter in the form of a bamboo (step shape) or can be reduced in diameter by an inclined surface.

Further, in the above-described embodiment of the piping member of the present invention, an enlarged diameter portion that bulges outward in a flange shape or a collar shape can be formed at the tip end side of the connecting portion. The expanded diameter portion can be formed in a structure in which the end portion of the connecting portion projects or bulges in a strip shape continuously or intermittently along the edge portion. Further, the protruding width of the enlarged diameter portion is not particularly limited as long as it can be inserted into the hole portion of another piping member to be connected, but for example, 1 mm or more from the reduced outer peripheral surface, preferably 1.5 mm. It is possible to project it with the above length.

Further, in the embodiment of the piping member of the present invention, the piping member has a pipe shape formed by using stainless steel, and the outer diameter of the pipe portion is such that a region where the connecting portion is not formed is connected. It has the same size as the outer diameter of the other target piping member, and the connecting portion can be formed by cutting the outer peripheral surface of the pipe portion.

And in order to solve the said subject, this invention provides the piping equipment formed using the piping member concerning the said invention. That is, a pipe facility formed by connecting pipe members for transporting and/or sealing fluid such as liquid, gas or powder, wherein at least one of the pipe members is a pipe member according to the present invention. Provided is a water pipe equipment which has been used and which has an adhesive applied to the outer periphery of the connecting portion and is adhered to the inside of the hole of the other piping member.

Moreover, in order to solve the said subject, this invention provides the connection structure of the piping member which uses the piping member concerning the said invention. That is, a liquid, a fluid such as gas or powder is a connection structure of the piping members for transporting and / or sealed, at least one of the piping members to be connected, the piping member of the present invention is used, An adhesive is applied to the outer periphery of the connecting portion to provide a connecting structure for the pipe members that are adhered inside the holes of the other pipe members.

The piping member of the present invention is formed by using a standardized piping member, and at least one end portion or both end portions in the length direction of the pipe portion is connected in series to another piping member. To form a connecting portion. Since this connecting portion is formed by reducing the diameter of the outer peripheral surface of the pipe portion to a size such that it can be inserted into the hole portion of another piping member to be connected, such as commercially available pipes. By using piping members, piping members that can easily perform connection processing at work sites have been realized. That is, it is possible to provide a piping member which improves the workability when constructing the piping equipment, and a piping equipment using the same, by eliminating the need for screwing or screwing at the work site.

1 is an overall schematic view showing an example of piping equipment for fire fighting, (A) equipment using conventional piping members, (B) equipment using piping members according to the present embodiment (A) perspective view showing a pipe joint, (B) vertical sectional view before connection, (C) vertical sectional view after connection (A) Longitudinal sectional view before connection showing the elbow pipe, (B) Vertical sectional view after connection (A) Longitudinal sectional view before connection showing a T-shaped tube, (B) Vertical sectional view after connection (A) Longitudinal sectional view before connection, (B) Longitudinal sectional view after connection showing a water shutoff valve (pipe member) (A) perspective view showing a pipe joint, (B) an enlarged longitudinal sectional view of an essential part before connection, (C) an enlarged longitudinal sectional view of an essential part after connection (A) perspective view showing a pipe joint, (B) an enlarged longitudinal sectional view of an essential part before connection, (C) an enlarged longitudinal sectional view of an essential part after connection A vertical cross-sectional view showing a pipe joint shown in the embodiment.

Hereinafter, the piping member 10 according to the present embodiment will be specifically described with reference to the drawings. In particular, the present embodiment shows an example of the piping member 10 for constructing fire fighting piping equipment. However, the piping member 10 can be used even if it is not a piping facility for fire fighting, and can be used, for example, as a piping facility for water and sewerage systems, or a piping facility for fuel gas such as gas or air.

FIG. 1 is an overall schematic view showing an example of piping equipment for fire fighting, showing (A) equipment using a conventional piping member 10 and (B) equipment using the piping member 10 according to the present embodiment, respectively. .. The fire-fighting piping facility shown in FIG. 1 includes an underground water storage tank 1 that stores fire-fighting water, a fire pump 2 that pumps up fire-fighting water from the underground water storage tank 1, and a pump control panel 3 that controls the operation of the fire pump 2. The fire-fighting pipe 10 for delivering the fire-fighting water pumped up by the fire-fighting pump 2, the fire hydrant 4 to which the fire-fighting water is supplied by the fire-fighting pipe 10, and the fire-fighting water pumped up by the fire-fighting pipe 10 on a rooftop or the like. It is composed of a high-altitude water storage tank 5 that stores in high altitudes. The fire fighting pipe 10 includes a cylindrical straight pipe 11, a T-shaped pipe 12 branched into a T-shape, an elbow pipe 13 (L-shaped pipe) 13 bent into an L-shape, and a water shutoff valve 14. And a pipe member 10 such as a pipe joint 15 that connects straight pipes to each other in series. These piping members 10 are connected to each other to form a flow path for fire extinguishing water.

In the fire extinguishing piping facility constructed by using the piping member 10 according to the conventional example shown in FIG. 1(A), the connecting portion of each piping member 10 is formed to have a large outer diameter. The piping member 10 is formed so that it can be connected. For example, the pipe joint 15 that connects the straight pipes to each other is formed in a cylindrical shape having a space for inserting the straight pipe 11 therein, and inevitably has an outer diameter larger than that of the straight pipe. .. Therefore, in the piping equipment constructed by using this conventional piping member 10, there naturally exists a portion projecting from the outer peripheral surface of the straight pipe 11.

On the other hand, in the fire fighting piping facility constructed using the piping member 10 according to the present embodiment shown in FIG. 1(B), the piping member 10 used for this is one or two or more tubular pipes. A portion (20) is provided, and at least one end portion or both end portions in the length direction of the pipe portion (20) is provided with a connecting portion (21) for connecting in series to another piping member (10). The connecting portion 21 is formed by reducing the outer peripheral surface of the pipe portion 20 into a size that can be inserted into the hole portion 22 of another piping member 10 to be connected. It is possible to configure so that the connecting portions between the members do not have unevenness. As a result, for example, the flange joints used to connect pipes and pipes, nozzles of equipment connected to pipes, and various instruments such as valves, thermometers, flowmeters, and liquid level gauges are straight pipe pipes. It is possible to move in the length direction of 11 across the connecting portion of the straight pipes.

Next, various piping members 10 used also for the above fire fighting piping equipment will be specifically described with reference to FIGS. FIG. 2 shows (A) a perspective view showing a pipe joint 15 for connecting straight pipes, (B) a vertical sectional view before connection, and (C) a vertical sectional view after connection. The piping member 10 (particularly the pipe joint 15) shown in this drawing is formed in a cylindrical shape, and the whole thereof is formed as a pipe portion 20. Then, on both sides in the length direction of the pipe portion 20, connecting portions 21 formed by reducing the outer peripheral surface of the pipe portion 20 by cutting or the like are provided. That is, the pipe joint 15 is configured so that the straight pipes can be connected to each other by utilizing the wall thickness of the cylindrical pipe.

Although the pipe joint 15 has the same outer diameter as the straight pipe 11 to be connected, the inner diameter is smaller than that of the straight pipe 11 to be connected, and the wall thickness is formed thicker than the straight pipe 11 to be connected. Using a standardized cylindrical pipe, the outer peripheral surfaces at both ends in the length direction are formed to have a diameter equal to or slightly smaller than the inner diameter of the straight pipe 11 to be connected. There is. This diameter reducing process can be appropriately selected according to the material forming the pipe joint 15 such as etching by a chemical or the like, in addition to forming by cutting as described above. In particular, when the pipe joint 15 is formed of stainless steel (for example, austenitic stainless steel such as SUS304), it is not a diameter reduction due to deformation such as caulking with stress, but a cutting process. It is desirable to reduce the diameter by cutting the outer peripheral surface. This is to prevent magnetization of stainless steel due to martensitic transformation due to mechanical processing such as caulking, and to avoid the problem of corrosion due to adhesion of magnetic material.

When the pipe joint 15 is formed of a metal such as stainless steel, the connecting portion 21 is formed to have an outer diameter smaller than that of the other outer peripheral surface in the range of 1.0 or more and 4.0 mm or less. desirable. At that time, it is preferable that the connecting portion 21 has a small outer diameter within a range of 20% or more and 45% or less of the wall thickness of the cylindrical pipe forming the pipe joint 15. This is for ensuring the strength of the connecting portion 21 and for optimizing the thickness of the gap with the inner peripheral surface of the straight pipe 11 to be connected.

The straight pipe 11 that is another pipe member 10 to be connected is exteriorly mounted on the connecting portion 21 formed as described above. That is, the connecting portion 21 is inserted into the hole 22 of the straight pipe 11 to integrate them. Therefore, the connecting portion 21 formed by reducing the diameter needs to be formed in such a size that it can be inserted into the hole portion 22 of the other pipe member 10 (straight pipe 11) to be connected. The diameter is in the range of 0.5 mm or more and 2.0 mm or less, preferably 0.5 mm or more, than the hole portion 22 (that is, the inner diameter of the straight pipe 11) of the other piping member 10 (straight pipe 11). It is desirable to be formed small in the range of 0.5 mm or less. This is to secure a gap for inserting the connecting portion 21 into the hole 22 of the other piping member 10 (straight pipe 11) and to prevent the fluid to be transferred from leaking from the gap.

When connecting the connecting portion 21 and the other piping member 10 (straight pipe 11), an adhesive can be provided between them. That is, the pipe joint 15 and the straight pipe 11 can be fixed and integrated with an adhesive. Therefore, the connecting portion 21 can be formed to have a length that can be an adhesion allowance. However, the length of the connecting portion 21 serving as the bonding margin can be appropriately selected depending on the required bonding strength, the material forming each member, or the substance to be circulated in the piping facility. In particular, when the pipe joint 15 is made of a metal such as stainless steel, the length (axial length) of the connecting portion 21 serving as the bonding margin can be set to 1 mm or more and 60 mm or less. Further, it is desirable that the length of the connecting portion 21 be 30% or more and 60% or less of the outer diameter of the cylindrical pipe that constitutes the pipe joint 15. This is to secure the joining strength in metals such as stainless steel and to eliminate the waste of cutting work due to the length being longer than necessary.

The adhesive that joins the connecting portion 21 of the pipe joint 15 and the straight pipe 11 to each other is appropriately selected depending on the material of which these piping members 10 are made, the required joining strength, and the substance that circulates in the piping facility. Acrylic resin adhesives, silicone resin adhesives, epoxy resin adhesives, vinyl chloride resin solvent adhesives, chloroprene rubber solvent mastic type adhesives, urethane resin adhesives Agents, modified silicone resin adhesives, epoxy/modified silicone resin adhesives, epoxy resin mortars, silylated urethane resin adhesives and the like can be used. Especially when the pipe joint 15 and the straight pipe 11 are made of metal such as stainless steel, and the straight pipe 11 connected to this is also made of metal such as stainless steel. In the case of being used for, it is desirable to use an epoxy resin adhesive as the adhesive. Further, by coloring the adhesive, it is possible to visually confirm whether or not the adhesive is applied to the connecting portion 21.

The pipe members 15 of the pipe joint 15 and the straight pipe 11 which are connected as described above are simply inserted because the connecting portion 21 is inserted into the hole portion 22 and further fixed and integrated with an adhesive. Can realize a strong connection that does not detach. Since the connecting portion 21 is formed with a reduced diameter as described above, the outer peripheral surfaces of both can be made flush with each other.

The pipe joint 15 shown in FIG. 2 can also be used as the straight pipe 11 by using a long pipe joint. That is, the connecting portions 21 are formed on both ends of the straight pipe 11, and the straight pipes 11 on which the connecting portions 21 are formed are arranged in series, and the inner diameter for inserting the connecting portion 21 between the two. It is also possible to provide the cylindrical pipe (straight pipe 11 in FIG. 2) and use the cylindrical pipe as the pipe joint 15. At this time, the cylindrical tube may be formed to have a length that allows the connecting portions 21 existing in series to be inserted.

FIG. 3 shows (A) a vertical sectional view before connection and (B) a vertical sectional view after connection, showing an elbow pipe 13 that can be used in the fire fighting piping facility. The elbow pipe 13 can be used when the straight pipe 11 is bent in the direction in which it is arranged, and is formed in a substantially L-shape as a whole. In the elbow pipe 13 according to the present embodiment, the connecting portion 21 is formed on the tip end side of the pipe portion 20 existing on both end sides thereof. Therefore, by inserting and fixing the connecting portion 21 into the hole 22 of the other piping member 10, it is possible to realize the connection between the piping members. In particular, when the outer diameters of the elbow pipe 13 and the straight pipe 11 are the same, conventionally, a pipe joint having an inner diameter that is the same as or slightly larger than the outer diameter of the elbow pipe 13 and the straight pipe 11 is used. Although it has been performed to connect the two by using 15, the elbow pipe 13 according to the present embodiment, since the connecting portion 21 is formed on the end side, the other pipe joint 15 The straight pipe 11 can be directly connected without using.

Also in the elbow pipe 13 according to this embodiment, when connecting with the straight pipe 11, an adhesive can be present between the connecting portion 21 and the inner surface of the straight pipe 11. Further, the size and the like of the connecting portion 21 can be formed in the same manner as the connecting portion 21 of the pipe joint 15 shown in FIG.

4A and 4B show (A) a vertical sectional view before connection and (B) a vertical sectional view after connection, showing a T-shaped pipe 12 that can be used in the fire fighting piping facility. The T-shaped tube 12 can be used when the fluid flowing in the tube is branched or merged. Particularly, in the T-shaped tube 12 according to the present embodiment, the connecting portion 21 is formed at each tip of a straight pipe portion (pipe portion 20) and a cross pipe portion (pipe portion 20) orthogonal to the straight pipe portion. However, the connecting portion 21 does not necessarily have to be formed at all end portions, and the connecting portion 21 may be formed only at any one or two end portions depending on the route of the pipe.

Even in the T-shaped tube 12 configured as described above, when connecting the connecting portion 21 to the straight pipe 11, the adhesive can be present between the connecting portion 21 and the inner surface of the straight pipe 11. .. Further, the size and the like of the connecting portion 21 can be formed in the same manner as the connecting portion 21 of the pipe joint 15 shown in FIG.

5A and 5B show (A) a vertical sectional view before connection and (B) a vertical sectional view after connection, showing a water shutoff valve 14 (pipe member 10) that can be used in the fire fighting piping facility. The water shutoff valve 14 according to the present embodiment includes a cylindrical flow path pipe (pipe portion 20), a sealing valve 14a that can freely move back and forth in the flow path pipe, and a handle portion 14b that moves the sealing valve up and down. The flow path pipe 14d (pipe portion 20) is projected from the main body portion 14c provided with the handle 14b and the like. The connecting portions 21 are formed at both ends of the flow path pipe 14d that becomes the pipe portion 20. The connecting portion 21 reduces the diameter of the outer peripheral portion of the pipe portion 20 constituted by the flow path pipe 14d by cutting or the like, and is provided in the reduced diameter portion on another piping member 10 such as the straight pipe 11. The hole 22 is formed so as to cover the exterior. In particular, when the outer diameters of the water shutoff valve 14 and the straight pipe 11 are the same, conventionally, the outer diameters of the water shutoff valve 14 and the straight pipe 11 are the same or slightly larger than those. The pipe joint 15 must be used to connect the two, or a flange or the like must be used to connect the two, but in the water shutoff valve 14 according to the present embodiment, the connecting portion 21 is provided on the end side. Since it is formed, the straight pipe 11 can be directly connected without using other members.

Even in the water shutoff valve 14 configured as described above, when connecting the straight pipe 11 to the connecting portion 21, an adhesive can be present between the connecting portion 21 and the inner surface of the straight pipe 11. .. Further, the size and the like of the connecting portion 21 can be formed in the same manner as the connecting portion 21 of the pipe joint 15 shown in FIG.

6A and 6B are (A) perspective views of a pipe joint 15 which is a piping member 10 according to another embodiment, (B) an enlarged vertical sectional view of an essential part before connection, and (C) an enlarged longitudinal sectional view of an essential part after connection. Is. The pipe member 10 according to this embodiment shows an example of the pipe joint 15 for connecting straight pipes to each other, like the pipe joint 15 shown in FIG. In the pipe joint 15 (piping member 10) according to the present embodiment, an enlarged diameter portion 21a that bulges like an outward flange is formed particularly on the tip side of the connecting portion 21. By forming the expanded diameter portion 21a, the connecting portion 21 is formed with a groove portion 21b that makes one round in the circumferential direction, and the adhesive can be accommodated in the groove portion 21b. That is, the connecting portion 21 whose outer peripheral surface is reduced in diameter is provided with the enlarged diameter portion 21a in which the tip side thereof is bulged outward in the radial direction, and the base end and the enlarged diameter portion 21a of the connecting portion 21 in the pipe portion. The pipe member 10 is provided with a groove between and. By providing an adhesive in this groove, the adhesive is reliably held between the connecting portion 21 and the inner surface of the hole portion 22, and the connection between the pipe members can be surely held. Further, by providing the enlarged diameter portion 21a, when the connecting portion 21 is inserted into the hole portion 22 of the other piping member 10 (straight pipe 11 or the like) to be connected, center alignment can be accurately performed. This can be done and bending at the connecting portion 21 minutes can be avoided.

The expanded diameter portion 21a is preferably formed with a length of 1 mm or more in the axial direction of the pipe portion, and particularly preferably with a length of 2 mm or more. The expanded diameter portion 21a is formed to have a length of 5% or more and 50% or less, preferably 7% or more and 20% or less of the axial center length of the connecting portion 21. This is for ensuring the length of the groove portion 21b in which the adhesive is provided and for ensuring the strength of the enlarged diameter portion 21a.

Further, it is desirable that the enlarged diameter portion 21a is projected from the outer peripheral surface of the reduced diameter coupling portion 21 with a length of 1 mm or more, and particularly preferably with a length of 1.5 mm or more. Further, it is desirable that the enlarged diameter portion 21a protrudes at a length of 80% or more, preferably 90% or more of the length (change amount) reduced in the connecting portion 21. For example, when the diameter of the connecting portion 21 is reduced by 2 mm, it is desirable that the enlarged diameter portion 21a is formed by projecting 1.6 mm or more, preferably 1.8 mm or more from the reduced outer peripheral surface.

7A and 7B are (A) perspective views of a pipe joint 15 which is a piping member 10 according to still another embodiment, (B) an enlarged vertical sectional view of an essential part before connection, and (C) an enlarged longitudinal section of an essential part after connection. It is a figure. The pipe member 10 according to this embodiment shows an example of the pipe joint 15 for connecting straight pipes to each other, like the pipe joint 15 shown in FIG. In the pipe joint 15 (piping member 10) according to the present embodiment, in particular, the connecting portion 21 is formed with a reduced diameter portion 21c that is gradually reduced in diameter toward the end portion side of the pipe portion 20. The outer diameter of the base end side of the connecting portion 21, that is, the maximum outer diameter of the connecting portion 21 is the same as the inner diameter of the hole 22 of the other piping member 10 into which the connecting portion 21 is inserted, or 0. It can be formed small with a length of 0.1 mm or more and 3.0 mm or less, preferably 0.2 mm or more and 0.5 mm or less. By forming in this way, the center positions of the pipe members 10 to be connected can be made to coincide with each other while ensuring the space where the adhesive is present.

According to the piping member 10 shown in the above embodiment, since the pipe portion 20 of each piping member 10 is formed with the connecting portion 21, directly with respect to the hole portion 22 of the other piping member 10. Can be connected. Since the connecting portion 21 is formed by reducing the outer peripheral surface of the standardized piping member 10, the connecting portion 21 is connected by inserting the connecting portion 21 into the hole 22 of another piping member 10. It is possible to eliminate the irregularities on the outer peripheral surfaces of the pipe members to make them flush with each other. In particular, the piping member according to the present embodiment is such that the tip side of the pipe portion is reduced in diameter by cutting or the like, and this is inserted into the hole portion of another piping member and fixed by an adhesive, Even when the pipe member is formed of austenitic stainless steel such as SUS304 or other stainless steel, it is possible to connect the pipe members without the need for screwing or welding at the installation site.

Furthermore, when a groove extending in the circumferential direction is formed in the connecting portion 21, the adhesive can be accommodated in the groove and the outflow of the adhesive can be eliminated. It can be performed more reliably.

When the piping member 10 includes a plurality of connecting portions 21, any one of the connecting portions 21 and the other connecting portion 21 can be different, and for example, the length of the connecting portion 21 and the diameter reduction amount. Alternatively, the sizes can be different.

In this example, a pipe joint shown in FIG. 8 was made of stainless steel, and a stainless pipe was connected to the pipe joint, and a test was conducted on a metal pipe joint compatible with fire fighting equipment. The pipe joint and the pipe were tested by using a plurality of samples with different outer diameters and connecting portions 21. The samples used in this experiment are shown in Table 1 below. The symbols A to K in Table 1 below and FIG. 1 are as follows.
A: outer diameter of stainless pipe B: inner diameter of stainless pipe C: outer diameter of pipe joint D: inner diameter of pipe joint E: axial length of pipe joint F: axial length of connecting portion G: axial length of groove in connecting portion H : Length of expanded part I: Width of protrusion of expanded part J: Depth of contraction at connecting part K: Axial thickness of pipe joint

Then, with respect to the above-mentioned sample, a test on a metal pipe joint compatible with fire fighting equipment was conducted under the test items and criteria shown in Table 2 below. As a result, it was confirmed that all the samples were compatible with all the tests.

From the above, it was confirmed that the piping member according to the present embodiment can be used for piping equipment for sake gobo water even when it is formed of stainless steel.

INDUSTRIAL APPLICABILITY The piping member of the present invention is used for construction of piping equipment such as water supply and sewerage, water piping equipment such as hot water supply piping equipment in addition to piping equipment for firefighting, gas transportation such as oil piping equipment and air conditioning equipment It can be used as piping equipment for use, or piping equipment for carrying powder or fluid.

1 Underground water storage tank
2 fire pump
3 Pump control panel
4 fire hydrant
5 High-altitude water storage tank
10 Piping members
11 straight pipe
12 T-tube
13 Elbow tube
14 Water stop valve
15 pipe joint
20 pipe part
21 connection
21a Expanding part
21b groove
21c reduced diameter part
22 hole

Claims (6)

A piping member for guiding and/or sealing fluid such as liquid, gas or powder,
It is formed by using a standardized piping member having one or more tubular pipe parts,
At least one end portion or both end portions in the length direction of the pipe portion is provided with a connecting portion for connecting in series to another piping member,
The pipe member, wherein the connecting portion is formed by reducing the outer peripheral surface of the pipe portion to a size such that it can be inserted into the hole of another pipe member to be connected.
The connecting portion is formed by gradually reducing the diameter toward the end portion side of the pipe portion, and the maximum outer diameter of the connecting portion is the hole portion of the other piping member into which the connecting portion is inserted. The piping member according to claim 1, which is the same as the inner diameter or is formed to be small within a range of 0.1 mm or more and 3.0 mm or less.
The pipe member according to claim 1 or 2, wherein an enlarged diameter portion that bulges outward in a flange shape is formed on the tip side of the connecting portion.
The piping member has a pipe shape formed of stainless steel,
The outer diameter of the pipe portion, the region in which the connecting portion is not formed is the same size as the outer diameter of the other piping member to be connected,
The pipe member according to claim 1, wherein the connecting portion is formed by cutting an outer peripheral surface of a pipe portion.
A piping facility formed by connecting piping members for transporting and/or sealing fluid such as liquid, gas or powder,
At least one of the piping members is the piping member according to any one of claims 1 to 4,
A water distribution pipe facility, wherein an adhesive is applied to the outer periphery of the connecting portion and is bonded in the hole of the other piping member.
A connection structure of piping members for transporting and/or sealing fluid such as liquid, gas or powder,
At least one of the piping members to be connected is the piping member according to any one of claims 1 to 4,
An interconnecting structure for a piping member, characterized in that an adhesive is applied to the outer periphery of the connecting portion so as to adhere to the inside of the hole of the other piping member.