JP2018062998A - Piping fastening structure and piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping fastening structure capable of increasing not only working efficiency but also shaft accuracy and fastening strength.SOLUTION: A piping fastening structure, in which ends of a pair of pieces of piping for use in civil engineering are connected to each other, comprises a male screw part and a female screw part. The male screw part is provided at the end of the one piece of piping. The female screw part is provided at the end of the other piece of piping, and screwed into the male screw part. A material for the piping is metal. In the piping fastening structure, at least a leading end region of the male screw part and a leading end region of the female screw part have padding parts in which a clearance between the male screw part and the female screw part is smaller than that of the other parts.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a piping fastening structure.

  In piping of various uses, fastening which connects the ends of piping is performed. As such a pipe fastening structure, for example, Patent Document 1 discloses a pipe fastening structure using a pipe having a taper male screw at one pipe end and a taper female screw at the other pipe end. Yes. In this pipe fastening structure, it is not necessary to use a joint, and the pipes are directly and simply connected, so that the working efficiency is improved.

JP 2000-46260 A

  When pipes are directly connected using screws as in Patent Document 1, depending on the manufacturing accuracy and work accuracy of the screws, the shaft position may be shifted between the pipes to be connected, and the shaft accuracy may be lowered. In addition, the fastening strength of the piping may be insufficient. In addition, the insertability may be deteriorated when sand or pebbles enter the work environment. Furthermore, in civil engineering work, work efficiency is required, so there is a demand for reducing the effort of adjusting shaft accuracy and fastening strength (bending, tensile, and compressive strength) (hereinafter simply referred to as “fastening strength”).

  An object of one aspect of the present disclosure is to provide a pipe fastening structure capable of improving shaft accuracy and fastening strength in addition to work efficiency.

  One aspect of the present disclosure is a pipe fastening structure in which a pair of pipes used for civil engineering applications are connected between end parts, and includes a male screw part and a female screw part. The male thread portion is provided at the end of one of the pipes. The female screw portion is provided at the end of the other pipe and is screwed with the male screw portion. The material of the pipe is metal. The pipe fastening structure has a stuffed portion in which the gap between the male screw portion and the female screw portion is smaller than the other portions at least in the tip region of the male screw portion and the tip region of the female screw portion. According to such a configuration, it is possible to improve the axial accuracy and fastening strength in the fastened state by the stuffed portions that are separated from each other in the axial direction of the pipe. Moreover, since piping can be directly connected without using a joint, the working efficiency is also improved by this configuration.

  According to one aspect of the present disclosure, a stuffed portion may be formed by contact between a screw thread and a screw groove in a distal end region of the male screw portion or the female screw portion. According to such a configuration, the shaft accuracy and the fastening strength can be improved more effectively.

  In one aspect of the present disclosure, the female screw portion may have a press-fit portion in which a screw groove and a thread are not formed at the tip, and a filling portion may be formed by the press-fit portion and the male screw portion. According to such a configuration, the insertion operation of the male screw portion can be made more efficient. Furthermore, shaft accuracy and fastening strength can be improved more effectively.

  In one embodiment of the present disclosure, the pipe provided with the male screw portion may have a tapered portion that decreases in diameter toward the male screw portion, and the tip of the female screw portion may abut on the tapered portion. According to such a configuration, the axial accuracy can be improved more effectively.

One embodiment of the present disclosure may further include a seal ring between one pipe and the other pipe. According to such a configuration, the sealing performance can be improved.
In one aspect of the present disclosure, at least one of the pair of pipes may have a plurality of water passage holes penetrating in the radial direction. According to such a structure, it can be used conveniently for uses, such as a drain pipe.

  Another aspect of the present disclosure is a pipe used for civil engineering, and includes a tubular pipe main body, a hollow male screw part, and a female screw part. The male screw portion is connected to one end portion of the pipe body. The female screw portion is connected to the other end of the pipe body and is configured to be screwable with the male screw portion. The material is metal. The pipe has a gap between the male screw portion and the female screw portion more than other portions when the male screw portion and the female screw portion are screwed into at least the tip region of the male screw portion and the tip region of the female screw portion. Has a small padding. According to such a configuration, when connecting the pipes, it is possible to improve the axial accuracy and the fastening strength in the fastened state by the stuffed portions that are separated in the axial direction of the pipes. Moreover, since piping can be directly connected without using a joint, the working efficiency is also improved by this configuration.

  In one aspect of the present disclosure, the pipe main body may be connected to the male screw portion and the female screw portion by welding. According to such a structure, piping can be manufactured easily.

1A is a schematic side view of a pipe fastening structure according to an embodiment, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. 2A is a schematic side view of a pipe fastening structure according to an embodiment different from FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB of FIG. 2A. It is typical sectional drawing of the fastening structure of piping of embodiment different from FIG.1 and FIG.2. It is a typical fragmentary sectional view of the fastening structure of piping of embodiment different from FIG.1, FIG.2, and FIG.3. It is typical sectional drawing of the fastening structure of piping of embodiment different from FIG.1, FIG.2, FIG.3 and FIG. 6A is a schematic perspective view of the piping of the embodiment, and FIG. 6B is an exploded view of the piping of FIG. 6A.

Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A piping fastening structure (hereinafter, simply referred to as “fastening structure”) 1 shown in FIGS. 1A and 1B is formed by connecting a pair of pipes used for civil engineering between end portions.

  As shown in FIGS. 1A and 1B, the fastening structure 1 includes a male screw portion 11 provided at an end of one pipe (hereinafter also referred to as “first pipe”) 10, and the other pipe (hereinafter, “ It is also referred to as a “second pipe”.) It is provided at an end portion of 20 and has a female screw portion 21 screwed with the male screw portion 11.

(Plumbing)
The material of the pair of pipes connected by the fastening structure 1 (that is, the first pipe 10 and the second pipe 20) is metal. As this metal, for example, stainless steel (SUS), zinc-aluminum-magnesium alloy, or the like can be used. Among these, by using stainless steel, the service life of the pipe can be increased, and the strength, weight, cost, and the like can be improved in a balanced manner. As stainless steel, for example, for wastewater use, a SUS material having a Cr content of 16% or more, which is a ferrite type or austenite type specified in JIS-G3459: 2012, is preferable.

  The first pipe 10 and the second pipe 20 are each formed with a screw (that is, the male screw portion 11 and the female screw portion 21) at the ends. The first pipe 10 has a male screw part 11 and a pipe main body 12 connected directly or indirectly to the male screw part 11. The second pipe 20 has a female screw part 21 and a pipe main body 22 connected directly or indirectly to the female screw part 21.

  The pipe bodies 12 and 22 have a cylindrical shape with flat outer and inner surfaces. The pipe bodies 12 and 22 may be curved or bent. Further, as shown in FIGS. 1A and 1B, the first pipe 10 and the second pipe 20 are portions whose diameter decreases toward the tip between the pipe main bodies 12 and 22 and the male screw portion 11 or the female screw portion 21. It is good to have. A plurality of the reduced diameter portions may be provided.

  The diameters of the pipe bodies 12 and 22 of the first pipe 10 and the second pipe 20 can be appropriately designed depending on the application. Although the thickness of the 1st piping 10 and the 2nd piping 20 can also be designed suitably, 0.5 mm or more and 2 mm or less are preferable from a viewpoint of weight reduction. In addition, although the diameter and thickness of the 1st piping 10 and the 2nd piping 20 are usually equal, you may differ.

  The 1st piping 10 and the 2nd piping 20 may have the some water flow hole 40 penetrated to radial direction, as shown to FIG. 1A and 1B. By providing a plurality of water passage holes 40 in the pipe in this way, the fastening structure 1 can be suitably used for, for example, a drain pipe buried so as to be exposed on a slope (for example, a slope). In addition, you may provide the water flow hole 40 only in one piping (namely, one of the 1st piping 10 and the 2nd piping 20). Further, it is preferable that the water passage hole 40 is provided only in the pipe main bodies 12 and 22, that is, not provided in the male screw portion 11 and the female screw portion 21.

(Male thread)
The male screw portion 11 is provided at an end portion of the first pipe 10, is inserted inside a female screw portion 21 described later, and is screwed into the female screw portion 21. The pitch and number of threads of the male threaded portion 11 can be appropriately designed according to the diameter and thickness of the pipe. The “male screw portion” refers to a portion from the root portion of the screw formed at the end of the first pipe 10 to the tip of the first pipe 10, and no thread groove and screw thread are formed at the tip of the screw. When a flat part exists, it is a concept including this flat part.

  The male screw portion 11 may have a tapered shape in which a region where the screw groove and the screw thread are formed is reduced in diameter toward the end portion. In addition, “taper” in this specification means that the diameter is reduced in the axial direction, and is a concept that includes a case where the outer edge of the central section is a curve.

(Female thread)
The female threaded portion 21 is provided at the end of the second pipe 20 and is screwed with the male threaded portion 11 located inside thereof. The “female screw portion” refers to a portion from the root portion of the screw formed at the end of the second pipe 20 to the tip of the second pipe 20, and no screw groove and screw thread are formed at the tip of the screw. When a flat part exists, it is a concept including this flat part.

  The female screw portion 21 may have a tapered shape in which the region where the screw groove and the screw thread are formed is increased in diameter toward the end portion. Further, as shown in FIGS. 2A, 2B, and 3, the female screw portion 21 may have a press-fit portion 211 in which a screw groove and a screw thread are not formed. Note that the fastening structure in FIG. 3 is obtained by omitting the reduced diameter portion provided in the pipe body 12 of the first pipe 10 from the fastening structure in FIG. 2B.

  The press-fitted portion 211 can serve as a guide when the male screw portion 11 is inserted, and can form a stuffed portion described later. Thereby, the insertion operation | work of the external thread part 11 can be made more efficient, and also the axial precision and fastening strength of the fastening structure 1 can be improved more effectively. Further, by providing the press-fitting portion 211 only in the female screw portion 21, it is possible to easily distinguish the male screw portion 11 and the female screw portion 21 before screwing. Note that the press-fitted portion 211 may be increased in diameter toward the tip.

(Padded part)
The fastening structure 1 has a stuffed portion in which the gap between the male screw portion 11 and the female screw portion 21 is smaller than that of other screwed portions at least in the tip region of the male screw portion 11 and the tip region of the female screw portion 21. . Specifically, as shown in FIG. 1B, a first stuffed portion 31 is formed in the tip region of the male screw portion 11 by contact between the screw threads of the male screw portion 11 and the female screw portion 21 and the screw groove. In the distal end region of the screw portion 21, the second stuffed portion 32 is formed by contact between the thread of the male screw portion 11 and the female screw portion 21 and the screw groove. The “tip region” refers to a region from the tip of the male screw portion 11 and the female screw portion 21 to a position where the formed screw groove makes two rounds from the tip side, preferably the screw groove from the tip side. Refers to the position of one round.

  Further, as shown in FIGS. 2A, 2 </ b> B and FIG. 3, when the female screw portion 21 has a press-fit portion 211, the third stuffed portion 33 may be formed by the press-fit portion 211 and the male screw portion 11. In addition, the area | region where the press-fit part 211 exists is contained in the front-end | tip area | region of the internal thread part 21 as above-mentioned. Therefore, in this case, two stuffed portions are formed in the tip region of the female screw portion 21, and the shaft accuracy and fastening strength can be effectively increased.

  The first stuffed portion 31 and the second stuffed portion 32 have, for example, a screw pattern of the male screw portion 11 and / or the female screw portion 21 (for example, the pitch, width, height, depth, etc. of the screw groove and screw thread). It can be formed by changing the other parts. Further, the third stuffing portion 33 can be formed by designing the press-fitting portion 211 of the female screw portion 21 so as to contact the thread of the male screw portion 11.

(Other configurations)
As shown in FIGS. 4A and 4B, the first pipe 10 provided with the male screw portion 11 is adjacent to the male screw portion 11 and has a taper portion (so-called slow side portion) 13 that decreases in diameter toward the male screw portion 11. You may have. Furthermore, the tip of the female screw portion 21, that is, the press-fitting portion 211 in FIGS. With this configuration, the axial accuracy can be improved more effectively. As shown in FIG. 4A, the diameter of the tip of the female screw portion 21 may be increased along the tapered portion 13, and the inner surface of the tip may be brought into contact with the outer surface of the tapered portion 13. As shown in FIG. 6, the tip of the female screw portion 21 may be made straight and then the tip may be brought into contact with the tapered portion 13.

  In addition, as shown in FIG. 5, a seal ring 50 may be provided between the first pipe 10 and the second pipe 20 where they are fitted. With this configuration, the sealing performance of the fastening structure 1 can be improved. When the seal ring 50 is provided, as shown in FIG. 5, a ring fitting portion 121 having a ring groove is provided at the base of the male screw portion 11, and the ring fitting portion 121 and the second pipe 20 (in FIG. 5). The seal ring 50 may be disposed between the press-fitted portion 211) of the female screw portion 21. In addition, it is good also as a structure which provides the ring fitting part 121 in the front-end | tip of the external thread part 11, and provides the seal ring 50 in this part.

(Use)
The fastening structure 1 is used for civil engineering. Civil engineering uses include drainage pipes, water supply pipes, and gas pipes. The fastening structure 1 can be suitably used for a drain pipe, and the effect is remarkably exerted particularly when used for a drain pipe that functions as a slope collapse prevention mechanism represented by a slope. This drain pipe is buried horizontally in the soil of the slope so that one end is exposed on the slope, and a plurality of pipes connected to each other is used. Since the fastening structure 1 has the effects described below, it is suitable for construction work on a slope and can improve the efficiency of the work of laying while connecting a plurality of pipes.

[1-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(1a) Since the first piping 10 and the second piping 20 including the male screw portion 11 and the female screw portion 21 are made of metal, mechanical strength such as bending strength and durability are compared with the case where resin piping is used. Excellent in properties. Furthermore, since the mechanical strength is high, a larger number of water passage holes 40 can be formed compared to the resin piping, and therefore, the drainage is excellent.

  (1b) It is possible to improve the axial accuracy and fastening strength in the fastened state by the plurality of stuffed portions 31, 32, 33 that are separated from each other in the axial direction of the pipe. Moreover, since the fitting feeling of fastening is obtained, it contributes also to workability | operativity improvement.

  (1c) Piping can be directly connected without using a joint. In addition, since the stuffed portion can be formed by a slight change in the screw pattern, insertability is not deteriorated. As a result, work efficiency is improved.

[2. Second Embodiment]
[2-1. Constitution]
A pipe 100 shown in FIG. 6A is connected to a cylindrical pipe main body 101, a hollow male screw part 11 connected to one end of the pipe main body 101, and the other end of the pipe main body 101. The female screw part 21 comprised so that screwing with the part 11 is provided. The material of the pipe 100 is metal. The pipe 100 can form a fastening structure by screwing the male screw portion 11 with the female screw portion 21 of another pipe 100, thereby connecting a plurality of pipes 100. The pipe 100 is used for civil engineering applications, and can be particularly suitably used as a drain pipe.

  The male screw portion 11 and the female screw portion 21 are the same as the male screw portion 11 and the female screw portion 21 in the fastening structure 1 of the first embodiment. That is, when the male screw portion 11 and the female screw portion 21 are screwed into at least the tip region of the male screw portion 11 and the tip region of the female screw portion 21, the pipe 100 has a male screw portion rather than the other portions. 11 is formed with a small gap between the female screw portion 21 and the female screw portion 21. Moreover, the piping main body 101 of the piping 100 is the same as the piping main bodies 12 and 22 of the first piping 10 and the second piping 20 in the fastening structure 1 of the first embodiment. Therefore, the overlapping description is omitted.

  The male screw portion 11 and the female screw portion 21 may be integrally formed with the pipe main body 101. 6B, the first member 102 including the male screw portion 11 and the socket portion 14 and the second member 103 including the female screw portion 21 and the socket portion 24 are connected to the pipe body 101 by welding. Thus, the pipe 100 may be formed. By using such a connection by welding, the pipe 100 can be manufactured relatively easily.

[2-2. effect]
According to the embodiment detailed above, the following effects can be obtained.
(2a) Since the pipe 100 is made of metal, it is excellent in mechanical strength and durability such as bending strength and tensile strength as compared with the case where resin pipe is used. Furthermore, since the mechanical strength is high, a larger number of water passage holes can be formed as compared with the resin pipe, and hence the drainage is excellent.

  (2b) When connecting the pipe 100, the shaft accuracy and fastening strength in the fastened state can be improved by the plurality of stuffed portions that are separated from each other in the axial direction. Moreover, since the fitting fit of fastening is obtained, it contributes also to the improvement of the workability | operativity of a connection.

  (2c) The pipes 100 can be directly connected without using a joint. In addition, since the stuffed portion can be formed by a slight change in the screw pattern, insertability is not deteriorated. As a result, work efficiency is improved.

[3. Other Embodiments]
As mentioned above, although embodiment of this indication was described, it cannot be overemphasized that this indication can take various forms, without being limited to the above-mentioned embodiment.

  (3a) In the fastening structure 1 of the first embodiment, it is sufficient that the stuffed portions are formed one by one in the tip region of the male screw portion 11 and the tip region of the female screw portion 21, and the second stuffed portion 32 is provided. You may have only the 1st filling part 31 and the 3rd filling part 33, without having. Further, two or more stuffed portions may be formed in each tip region.

  (3b) As a modification of the pipe 100 of the second embodiment, the pipe is used for civil engineering, and is a cylindrical pipe main body and a hollow male screw portion connected to one end of the pipe main body. The material is metal, and when the male screw part is screwed into the female screw part to which the male screw part can be screwed, at least the tip region of the male screw part and the tip region of the female screw part In addition, a pipe having a stuffing portion in which a gap between the male screw portion and the female screw portion is smaller than other portions can be mentioned. The other end of the pipe main body of this pipe may not be formed with a screw, may be formed with a male screw, or may be configured to be attached with other members.

  (3c) As another modified example of the pipe 100 of the second embodiment, the pipe is used for civil engineering, and has a tubular pipe body and a female screw part connected to one end of the pipe body. And the material is metal, and when the male screw portion that can be screwed into the female screw portion is screwed, at least the tip region of the male screw portion and the tip region of the female screw portion In addition, a pipe having a stuffing portion in which a gap between the male screw portion and the female screw portion is smaller than other portions can be mentioned. Also in this pipe, the other end of the pipe main body may not be formed with a screw, may be formed with a female screw, or may be configured to be attached with other members.

(3d) In the male screw portion or the female screw portion, two or more screws may be intermittently formed across a flat portion where the screw groove and the screw thread are not formed.
(3e) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

  DESCRIPTION OF SYMBOLS 1 ... Fastening structure, 10 ... 1st piping, 11 ... Male thread part, 12 ... Pipe main body, 13 ... Tapered part, 14 ... Socket part, 20 ... Second piping, 21 ... Female thread part, 22 ... Pipe main body, 24 ... Socket portion, 31 ... first stuffing portion, 32 ... second stuffing portion, 33 ... third stuffing portion, 40 ... water passage hole, 50 ... sealing ring, 100 ... piping, 101 ... piping body, 102 ... first member , 103 ... second member, 121 ... ring fitting part, 211 ... press-fitting part.

Claims (8)

It is a fastening structure of a pipe in which a pair of pipes used for civil engineering applications are connected between ends,
A male thread provided at the end of one pipe;
Provided at an end of the other pipe, and provided with a female screw portion screwed with the male screw portion,
The material of the piping is metal,
A piping fastening structure, wherein at least a leading end region of the male screw portion and a leading end region of the female screw portion have a stuffing portion in which a gap between the male screw portion and the female screw portion is smaller than other portions. The fastening structure for piping according to claim 1,
A piping fastening structure in which the stuffed portion is formed by contact between a screw thread and a screw groove in a distal end region of the male screw portion or the female screw portion. A pipe fastening structure according to claim 1 or 2,
The female screw portion has a press-fit portion where a screw groove and a thread are not formed at the tip,
A piping fastening structure in which the filling portion is formed by the press-fitting portion and the male screw portion. A fastening structure for piping according to any one of claims 1 to 3,
The pipe provided with the male screw portion has a taper portion that decreases in diameter toward the male screw portion,
A pipe fastening structure in which a tip of the female screw portion is in contact with the tapered portion. A piping fastening structure according to any one of claims 1 to 4, wherein
A pipe fastening structure, further comprising a seal ring between the one pipe and the other pipe. A fastening structure for piping according to any one of claims 1 to 5,
The fastening structure of a pipe, wherein at least one of the pair of pipes has a plurality of water passage holes penetrating in a radial direction. Piping used for civil engineering purposes,
A tubular pipe body,
A hollow male screw connected to one end of the pipe body;
A female screw portion connected to the other end of the pipe body and configured to be screwable with the male screw portion;
The material is metal
When the male screw portion and the female screw portion are screwed into at least the tip region of the male screw portion and the tip region of the female screw portion, the male screw portion and the female screw portion are more than other portions. Piping that has a stuffed part with a small gap. The piping according to claim 7,
The pipe body is connected to the male screw part and the female screw part by welding.

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