WO1998011375A1 - Unit piping method and stainless steel therefor - Google Patents

Abstract

A stainless steel pipe (10) comes in three types, stainless steel pipes (10a, 10b, 10c) in which bellows portions (11) are bent to respectively provide a triangular shape, a trapezoidal shape, and a polygonal shape, and the respective stainless steel pipes (10a, 10b, 10c) are selected so as to be suitable for piping site requirements and combined with the bellows portions (11) bent at desirable angles to form various configurations of piping paths in a simple manner. Integrally secured to a straight pipe portion (12) on one end of the stainless steel pipe (10) through resin molding is an insulating sleeve (13) having a circumferential surface having a low friction coefficient to permit slide fitting, and a single-ended nipple (15) or a cap nut (24) is rotatably mounted on the outer circumference of the sleeve (13) while a means is provided for preventing the coming-off thereof.

Description

 Description Unit piping method and stainless steel pipe for piping

 The present invention relates to a unit piping method excellent in durability, excellent in workability on site, and suitable for reducing costs, and a stainless steel pipe for piping. Background art

 As is well known, various pipelines, such as water pipes, gas pipes, and transmission line protection vibes, are complicatedly bent in three dimensions even when buried underground. Especially when plumbing indoors such as high-rise buildings, apartment houses, and general houses, pillars, beams, and various types of equipment are placed in a limited space. It becomes an obstacle, making the piping path more complicated.

 Conventionally, when forming a pipe that bends in a complicated manner in the three-dimensional direction, the straight pipe is cut to a predetermined length according to the situation at the site, and the pipe is connected while being connected by a bent joint such as an elbow. Therefore, skilled workers are required, piping work is troublesome, and the number of parts increases, so simplification of them is desired. For this reason, in recent years, as shown in FIG. 12, a stainless steel pipe 1 having a bellows 2 has been widely used.

The stainless steel pipe 1 has excellent corrosion resistance due to the properties of the stainless steel material, and since the bellows portion 2 has flexibility, it can be bent at the bellows portion 2 and can be piped. Since piping is not required, the piping operation can be simplified and the number of components can be reduced, and displacement can be absorbed in the bellows portion 2 after piping. The present inventor pays attention to the advantage of the stainless steel pipe having such a bellows portion, and a unit piping method capable of forming a complicated piping path more easily, and a stainless steel pipe for the piping. The subject is the provision of pipes. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is an explanatory view showing one example of formation of a pipe passage according to the present invention, FIG. 2 is a plan view showing a stainless steel pipe for triangular pipes, and FIG. 3 is a stainless steel for trapezoidal pipes Plan view showing a rope tube, FIG. 4 is a plan view showing a stainless steel pipe for polygonal piping, and FIG. 5 shows a preferred configuration example of a joint portion at one end side of a stainless sea bream pipe for piping. FIG. 6 is an explanatory cross-sectional view showing the other end side of the stainless steel pipe for piping in FIG. 5, and FIG. 7 is one end side of a stainless steel pipe for piping in FIG. FIG. 8 is a cross-sectional view for illustrating a second configuration example in FIG. 8, FIG. 8 is a cross-sectional view for explanation showing a third configuration example on one end side of the stainless steel pipe for piping in FIG. 5, and FIG. 8 is a side view of the sleeve for greenery used in FIG. 10, and FIG. 10 is a stainless steel sleeve for piping in FIG. FIG. 11 is a cross-sectional view for illustrating a fourth configuration example on one end side of a rope tube, FIG. 11 is an explanatory view showing storage and transportation of a stainless steel pipe for piping, and FIG. 12 is a conventional sectional view for piping. FIG. 3 is an explanatory view showing one example of a stainless steel pipe.

BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

 As shown in Fig. 1, in the indoor area where the pipeline is formed, there are obstacles I which require the formation of a triangular pipeline, obstacles which require the formation of a trapezoidal pipeline Π, and a polygonal shape. It is assumed that an obstacle m that requires the formation of a pipeline is installed, and an example will be described in which a pipeline is formed while avoiding these obstacles and IS.

First, in the case of forming a triangular pipe while avoiding gaps and obstacles, a stainless steel pipe 10a shown in FIG. 2 is used. That is, stainless steel pipe 10 a One bellows portion 11 is formed at the center of the stainless steel pipe 10a, and by bending the bellows portion 11, a triangular pipe passage is formed.

 Next, in the case of forming a trapezoidal piping path while avoiding the gap material ス テ ン レ ス, a stainless steel rope 10b shown in FIG. 3 is used. That is, the stainless steel pipe 10b has two bellows 11 and 11 formed at an appropriate interval in the middle of the stainless steel pipe 10b, and these bellows 11 and 11 are formed. By bending, a trapezoidal pipeline is formed.

 In addition, when forming a polygonal pipeline while avoiding the obstacle ΠΙ, use a stainless steel rope 10c shown in FIG. That is, the stainless steel pipe 10c has three bellows portions 11, 11, and 11 formed at an appropriate interval in an intermediate portion of the stainless steel rope 10c. By bending 1, 1 1, a polygonal piping path is formed. The bellows part 11 of the stainless steel rope 10c forming the polygonal pipe may be provided at three or more places.

 On the other hand, if bellows 11 and 11 are added near the straight pipes 12 and 12 on both ends of each stainless steel pipe 10a, 10b and 10c, a triangular shape, The ends of each of the stainless steel ropes 10a, 10b, 10c formed as shapes and polygons are horizontally bent by bending the bellows parts 11, 1 near the straight pipe parts 12, 12. The straight stainless steel pipes 10a, 10b, 10c to be combined with each other can be butt-connected to each other, and can be connected well.

 As described above, according to this embodiment, the bellows 11 provided on the stainless steel ropes 10a, 10b, 10c is formed so that the bellows 11 is bent in a triangular, trapezoidal, or polygonal shape. Since the arrangement of 11 was made regular, each stainless steel pipe 10a, 1Ob, 10c was appropriately selected according to the situation at the piping site, and each selected stainless steel pipe 10 By bending and combining the bellows portions 11,-,-of a, 10 b, and 10 c at desired angles, a complicated piping path can be easily formed while avoiding obstacles of various shapes. It can be performed.

Therefore, it is excellent in durability, workability in the field, It is considered to be a unit piping method that can reduce the labor required for the work such as pipe connection and reduce the cost.

 In addition, since the bellows portion 11 can be bent not only in the two-dimensional direction but also in the three-dimensional direction, actually, a more complicated piping path than that shown in FIG. 1 can be easily formed.

 In addition, when the bellows portions 11 and 11 are added near the straight pipe portions 12 and 12 on both ends of each stainless steel rope 10 a, 10 b and 10 c, respectively, Since the bellows portions 1 1, 1 1 1 can be bent to make the straight pipe portions 1 2, 1 2 at both ends horizontal, the stainless steel tubes 10 a, 10 b, 10 c to be combined Good connection between them can be achieved. '

 Next, the end structure of the stainless steel tube 10 (10a, 10b, 10c) will be described.

 The end of the stainless steel tube 10 at one end is formed as a straight tube portion 12. Therefore, this straight pipe section 12 is welded to the straight pipe section 12 of the stainless steel pipe 10 to be combined with, or connected to a joint such as a bag nut, cheese, elbow or the like of the other party. The configuration is as follows.

 As an example, it is preferable to be configured as shown in FIG. In other words, the outer peripheral surface of the straight pipe portion 12 is made to have the same end faces so as to have an insulative property such as vinyl chloride, has a small friction coefficient, and can be slid on the one-side nibble 15 described later. The sleeve 13 having the shape is permanently fixed.

 The insulating sleeve 13 is integrally fixed to the straight pipe portion 12 by resin molding, and specifically, a plurality of strips formed in the direction 1) of the straight pipe portion 12). Are firmly and temporarily fixed to the outer periphery of the straight pipe portion 12 via the bulging portions 12a, 12a. In addition, two annular grooves 13a and 13a are formed in the outer peripheral surface of the sleeve 13 to fit a pakkin 14 for preventing water leakage. A small-diameter stepped portion 13b is formed at the rear of the tube 10 side.

The annular groove 13a should be provided on the inner peripheral surface of the one-side nibble 15 described later. _May be _β

 The joint fitted to this sleeve 13 has a single nipple 15 having a threaded portion 15b on the outer peripheral surface on one side of the central brim portion 15a and a smooth portion 15c on the other side. It is formed. The screw portion 15b is screwed with a screw portion of a joint (not shown) such as a bag nut, cheese, and elbow.

 The inner peripheral surface 17 of the central brim portion 15a and the smooth portion 15c of the one-side nipple 15 is formed to have a larger diameter than the inner peripheral surface 16 of the screw portion 15b, and the stainless steel pipe 10 A straight pipe portion 12 on one end side and a sleeve 13 fixed to the outer peripheral surface thereof are inserted. Further, the sleeve 13 and the one-side nibble 15 are slidable.

 An annular groove 13 c is formed in the inner peripheral surface 17 on the smooth portion 15 c side of the one-sided nifrillet 15 facing the small-diameter stepped portion 13 b of the sleeve 13. A C-shaped ring 18 having an urging force is inserted therein as a retaining member, and the protruding portion of the C-shaped ring 18 in the state of being fitted into the annular groove 13 c has a small diameter of the sleeve 13. By contacting the stepped portion 13b, the one-side nipple 15 is prevented from coming off.

 For the C-shaped ring 18, a steel wire having a panel constant made of phosphor bronze or stainless steel is used.

 The C-shaped ring 18 as a retaining member is a straight pipe 12 at one end of the stainless steel pipe 10 on the inner peripheral surface 17 of the one nipple 15 and a sleeve 1 fixed to the outer peripheral surface. With the 3 fitted, insert it while bending it into the annular opening that forms the gap between the inner peripheral surface 17 of the one-side nipple 15 and the sleeve 13. When it moves to the contact position, it expands due to the urging force and is fitted into the annular groove 13c. Reference numeral 19 denotes a packing for improving watertightness.

As described above, the flexible sleeve 13 having an outer peripheral surface that can slide with the one nipple 15 is fixed to the outer periphery of the straight pipe portion 12 on one end side of the stainless steel rope 10, The one-piece nibble 15 is configured so as to be prevented from falling off via the C-shaped ring 18 abutting on the small-diameter stepped portion 13 b of the sleeve 13, so that a bag nut, a chip, an elbow, etc. When connecting the stainless steel cable 10 to the Even if the stainless steel pipe 10 is kept in a fixed state, the screw part 14 b of the one nipple 14 can be screwed into the joint by rotating the one nipple 14, so that the connecting operation can be easily performed.

 Further, even after the connection of the stainless steel pipe 10 to the joint is completed, the stainless steel pipe 10 can be freely rotated by 360 °, so that work can be reduced and efficiency can be improved. Further, unlike the conventional case, a nipple prepared as a separate part is not required, and the joint structure of the pipe end having a small number of parts can be achieved, thereby reducing the cost.

 In addition, since the green sleeve 13 fixed to the straight pipe portion 12 of the stainless steel rope 10 is integrally fixed to the straight pipe portion 12 by resin molding, the fixing work is also simplified. Therefore, it is possible to reduce the trouble of fixing, and to prevent the electrolytic corrosion of the stainless steel rope 10.

 Therefore, it is possible to reduce the labor of piping work in the field work, and to provide a stainless steel pipe 10 for piping with low cost, good workability, and excellent corrosion resistance. On the other hand, FIG. 6 is an explanatory sectional view showing the other end side of the pipe rest in FIG. 1, and the straight pipe portion 12 shown in this figure has a central portion 12 b formed in a polygonal cross section. A green sleeve 20 made of a resin material is melted and fixed to the outer periphery of the straight pipe portion 12b.

 Therefore, even if a fixing support (not shown) for fixing the outer periphery of the insulating sleeve 20 to a support such as a bar made of a dissimilar metal is sandwiched, the stainless steel pipe 10 has an insulating property. It is ensured to prevent electricity.

 It is a matter of course that the insulating sleeve 20 may be attached to a desired pipe stop to be held by the fixing support.

In addition, irregularities 20 a and 20 b for preventing surface movement may be provided on the outer periphery of the insulating sleeve 20 in the longitudinal direction. The force at which the pipe end of the joint part 21 is integrally connected to the pipe end of the straight pipe part 12 in FIG. 6 by the connecting part 22 is a joint as shown in FIG. It may be configured as a part. FIG. 7 shows a second configuration example of the straight pipe portion 12 on one end side shown in FIG. 5. The end portion of the straight pipe portion 12 comes into contact with the end face of the sleeve 13 by pipe expansion processing. A flare portion 12c is formed, and a packing 19 for preventing water leakage is interposed in a space formed by the flare portion 12c, the sleeve 13 and the straight pipe portion 12. In addition to the effects of the straight pipe section 12 shown in FIG. 5, this prevents water leakage and improves water tightness.

 Although not shown, the straight pipe portion 12 is bent and formed, and the bent straight pipe portion 12 is fixedly formed so as to be embedded in the sleeve 13, and the sleeve 13 is formed into the straight pipe portion 1. It may be tightly integrated with 2 to further enhance the watertightness.

 FIG. 8 shows a third configuration example of the straight pipe portion 12 at one end shown in FIG. 5. The straight pipe portion 12 at one end of the stainless steel rope 10 has a flared end. 23 are formed temporarily by welding. Reference numeral 24 denotes a commonly used bag nut having a female thread 24a formed on an inner peripheral surface thereof and an inner peripheral groove 2 into which a fixing wire 25 which is a C-shaped ring is fitted. 4b is formed.

 The inner diameter of the bag nut 24 is slightly larger than the diameter of the flare end 23, so that the bag nut 24 is not hindered by the flare end 23. The part 23 is inserted into the straight pipe part 12 from the side thereof, and is freely mounted on the straight pipe part 12. Also, when the stop wire 25 is fitted into the inner circumferential groove 24 b formed on the inner circumferential surface of the bag nut 24, the stop wire 25 protruding from the inner circumferential groove 24 b becomes the flare end 2. It comes into contact with 3 to prevent the bag nut 24 from coming off.

 Reference numeral 26 denotes an insulating sleeve. As shown in FIG. 9, the insulating sleeve 26 is provided at one end of the cylindrical portion 26a for covering the outer peripheral surface of the straight pipe portion 12 and one end of the cylindrical portion 26a. Is formed as a half-cut sleeve with a cut in the longitudinal direction.When the sleeve is fitted, it is forcibly forced out of the cut 26 c. Deploy and attach.

The green sleeve 26 is formed of polypropylene resin and is formed to withstand a load of 800 kg. A material with displacement may be used.

 In addition, the outer periphery of the flange 26 b of the insulation sleeve 26 is formed to have a slightly larger diameter than the flare end 23, whereby the outer peripheral surface of the flare end 23 and the inside of the bag nut 24 are formed. The gap created between the 阇 surface is sealed.

 FIG. 10 shows a fourth configuration example of the straight pipe section 12 on one end side shown in FIG. 5, in which a flare part 12 a is added to the straight pipe section 12 of the stainless steel pipe 10. An insulating sleeve 31 having a step is fitted on the depth side of this part of the frame 12a, and an insulative sealing packing 32 is mounted on the tip side of the part of the frame 12a. Fit. Then, the bag nut 30 containing the insulating sleeve 31, the flare part 1 a, and the green sealing packing 32 is locked by the base of the insulating sleeve 31, and the base is locked. The bag nut 30 is screwed with a screw portion on one side of a nibble 33 connected to a joint (not shown). The nipple 33 is insulated from the stainless steel pipe 10 and water is leaked through the insulating sealing packing 32, and the bag nut 30 is stuck through the insulating sleeve 31. Insulation between the tube 10 is achieved.

 Fig. 11 shows the good storage and transportation of the stainless steel tube 10. The bellows 11 is bent while shifting the angle to make the stainless steel tube 10 into a wound state.保管 Store and transport tube 10.

 As a result, even if the stainless steel rope 10 for piping is long, it can be stored and transported in a short length, and space efficiency and transport to the site 'on-site workability' can be improved. be able to. Industrial applicability

As described above, according to the invention described in claim 1, three types of regularity are provided such that the bellows formed in the stainless steel pipe is bent as a triangular, trapezoidal, or polygonal shape. Stainless steel pipes are prepared so that stainless steel pipes that can be formed in each shape are selected as appropriate according to the situation at the piping site. In addition, by bending and combining the bellows portions at a desired angle, it is possible to easily form a complicatedly bent pipe path while avoiding obstacles of various shapes, even if they are present.

 Therefore, it is possible to reduce the number of parts and the labor required for the work while reducing the number of parts and the work, as well as having excellent durability when forming the pipe passage.

 According to the invention described in claim 2, the bellows portions in the vicinity of the straight pipe portions at both ends of each stainless steel pipe are bent to make the straight pipe portions at both ends of the stainless steel pipe horizontal. The connection between the combined stainless steel pipes can be made well.

 In addition, according to the invention described in claim 3, a single nipple is rotatably attached to the joint portion of the stainless steel tube without using a bag nut at the joint portion of the stainless steel tube, through an insulating sleeve. With this configuration, it is possible to prevent electric corrosion, and it is not necessary to interpose a separate nipple to be connected to the joint of the fire extinguishing pipe as a separate component, thereby reducing the number of components.

 In addition, simply connecting the one nibble to the joint by screwing, etc. completes the connection between the stainless steel pipe and the joint, simplifying the connection work, and even after the stainless steel pipe is fixed with a fixing support or the like. Connection work can be performed. Further, even after the connection between the stainless steel pipe and the joint is completed, the stainless steel pipe can be freely rotated by 360 °, so that the work can be reduced and the efficiency can be improved.

Further, according to the inventions described in claims 4 and 5, it is possible to stop the electric power while using a bag nut at the joint portion of the stainless steel pipe as in the related art. According to the invention described in Claim 6, in addition to the effects of Claim 3 or Patent Claim 4.5, a bellows portion near the straight pipe portion at both ends of each stainless steel pipe is provided. The straight pipes at both ends of the stainless steel pipe can be made horizontal by bending, and the stainless steel pipes to be combined can be connected well. You.

 According to the invention described in claim 7, the bellows portion of the stainless steel pipe is bent and stored while being wound while shifting the angle, so that the long stainless steel pipe for piping is shortened. It can be stored and transported at the same time, improving the handling efficiency such as space efficiency and carrying-in / on-site workability.

Claims

The scope of the claims 1. In a piping method using a stainless steel rope tube in which both ends are straight pipes and a bendable bellows section is appropriately provided in the middle part, A stainless steel rope for a triangular pipe that can be bent in a triangular shape through one bellows part provided in the central part,  A stainless steel pipe for trapezoidal piping that can be bent into a trapezoidal shape through two bellows parts provided at appropriate intervals in the middle part,  A stainless steel rope for the desired piping is selected from the stainless steel rope for the polygonal piping that can be bent into a polygon through three or more bellows provided at appropriate intervals in the middle part. And a bellows part of the selected stainless steel pipes is bent and assembled at a desired angle to form piping paths of various shapes according to the conditions at the piping site. 2. The unit piping method according to claim 1, wherein the stainless steel pipes for piping are provided with bellows near the straight pipes on both ends. 3. A stainless steel tube with straight pipes on both ends and a bendable bellows in the middle as appropriate.  A permanent sleeve having a slidable outer peripheral surface with a small coefficient of friction is temporarily fixed to the straight pipe at either end or at one end, and is engaged with the mating joint. A stainless steel pipe for piping, characterized in that a single nipple provided with a portion is rotatably mounted on the outer periphery of the sleeve while preventing the sleeve from coming off. 4. In a stainless steel tube with straight pipes at both ends and a bendable bellows at the middle part as appropriate, Sliding with a low coefficient of friction is possible with straight pipes on both ends or either end A green nut with a special outer peripheral surface is fixed temporarily, and a bag nut provided with an engaging portion that engages with the mating joint is rotatable while preventing the sleeve nut from coming off the outer periphery of the sleeve. A stainless steel pipe for piping characterized by being attached to a pipe. 5. In a stainless steel rope with straight pipes at both ends and a bendable bellows at the middle part as appropriate,  Flare portions are formed on the straight pipes at both ends or at one end, and insulating members are attached to the depth side and the tip side of a part of the flare, respectively, via the members at the depth side of the flare portion. A piping nut characterized in that the bag nut is rotatably mounted while preventing the nut from coming off, and the bag nut is engaged with a nibble attached via a green member attached to the front end side of the flare portion. Stainless steel pipe. 6. The stainless steel pipe for piping according to claim 3, 4, or 5, wherein the stainless steel pipe for piping is provided with bellows near the straight pipes at both ends. 7. The bellows part is bent while shifting the angle to form a stainless steel tube in a wound state, and the stainless steel tube is stored and transported in this state, claims 1, 2, 3, and 4. Stainless steel pipe for piping described in 5 or 6.