JP5199764B2 - Pipe structure - Google Patents

Description

  The present invention relates to a pipe structure such as a handrail or a fence obtained by assembling a plurality of hollow metal pipes.

  For example, a handrail or a fence (pipe structure) is widely obtained by assembling a hollow metal pipe. For example, when assembling a handrail as a pipe structure, as shown in FIG. 11, the assembled side supported by the column pipe 104 or the like on the end surface 101a of the assembly side pipe 101 supported by the column pipe 103 or the like The end face 102a of the pipe 102 is brought into contact, and the contact portion is welded or the like to be firmly joined. In addition, since this prior art does not relate to the literature known invention, there is no prior art document information to be described.

  However, in the above-described conventional pipe structure, since it is necessary to weld the end surface 102a of the assembled side pipe 102 to the end surface 101a of the assembled side pipe 101, the work takes time and the working place is limited. At the same time, when trying to finish the joined portion more smoothly, there is a problem that skill in welding work is required. In addition, it is necessary to position the end face 101a of the assembly side pipe 101 and the end face 102a of the assembly side pipe 102 so as to match each other and perform welding while maintaining the state. When a slight load is applied to the own weight or any of the pipes 101 and 102, there is a problem that the workability at the time of welding is deteriorated due to deviation in the radial direction.

  The present invention has been made in view of such circumstances, and can easily and stably position the end faces of the metal pipe, can maintain the contact state between the end faces firmly, and is simple and easy. An object of the present invention is to provide a pipe structure in which a plurality of metal pipes can be assembled at low cost.

The invention according to claim 1 is a pipe structure obtained by assembling a plurality of hollow metal pipes, and an uneven surface having an inclined surface extending while being inclined with respect to the extending direction is formed on the end surface. The assembled side pipe, and an assembled side pipe having an uneven shape formed on the end surface that can match the uneven shape formed on the end surface of the assembled side pipe, and the assembled side pipe By aligning the concavo-convex shape of the end surface of the assembly-side pipe with the concavo-convex shape of the end surface of the assembly-side pipe, the assembly-side pipe is centered with respect to the assembly-side pipe. The concavo-convex shape formed on the assembly-side pipe has a corrugated shape in which the concave and convex portions are curved, and is directed toward the axis over the entire circumference of the assembly-side pipe and the assembly-side pipe. to be irradiated with a laser beam Te Consist edge surface obtained by cutting, characterized in that it is possible surface contact during matching.

According to a second aspect of the invention, the pipe structure according to claim 1 Symbol mounting, irregularities formed in said the assembly side pipe and the assembly side pipe, at substantially regular intervals around the entire circumference of the pipes In addition to being formed, an odd number of concave or convex shapes are formed on each end face.

  According to the first aspect of the present invention, the assembling side pipe is centered with respect to the assembling side pipe by matching the asperity shape of the end surface of the assembling side pipe with the asperity shape of the assembling side pipe. Therefore, the end surfaces of the metal pipes can be easily and stably positioned, the contact state between the end surfaces can be maintained firmly, and a plurality of metal pipes can be assembled easily and inexpensively.

Furthermore, the uneven shape formed on the assembled side pipe and the assembled side pipe has a corrugated shape in which the concave and convex portions are curved, so that the unevenness of the end surfaces of the assembled side pipe and the assembled side pipe When matching the shapes, the end faces can be brought into contact with each other while avoiding excessive concentrated loads.
Furthermore, since the concavo-convex shape is formed by laser light irradiation, the concavo-convex shape can be formed easily and accurately, and the concavo-convex shape of the end surface of the assembly-side pipe with respect to the concavo-convex shape of the end surface of the assembly-side pipe The shape can be matched more accurately.

According to the invention of claim 2 , the concave and convex shapes formed on the assembled side pipe and the assembled side pipe are formed at substantially equal intervals over the entire circumference of each pipe, and the concave or convex portions are respectively provided. Since the odd-numbered end surfaces are formed, it is possible to improve the bonding strength when a load is applied in the radial direction to the contact portions between the end surfaces.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The pipe structure according to the present embodiment includes a handrail obtained by assembling a plurality of hollow metal pipes, and as shown in FIG. 1, the assembled side pipe 1 and the assembled side are both beam pipes. It is mainly composed of a pipe 2 and support pipes 3 and 4 that are support pillars for supporting the beam pipe.

  The assembled side pipe 1, the assembled side pipe 2, and the support pipes 3, 4 are all made of hollow metal pipes (for example, stainless steel pipes), and in particular, assembled with the assembled side pipe 1. The diameter (inner diameter and outer diameter) of the attached pipe 2 is the same (see FIG. 5). In addition, the to-be-assembled side pipe 1 and the to-be-assembled side pipe 2 are each provided with support pipes 3 and 4 on their side surfaces and supported at a predetermined height.

  The assembled side pipe 1 is formed with an uneven shape having an inclined surface c (see FIGS. 3 and 4) extending on the end surface 1a while being inclined with respect to the extending direction. In the form, as shown in the figure, the concavo-convex shape is a corrugated shape in which the concave portion b (the bottom portion of the mountain) and the convex portion a (the top portion of the mountain) are curved, and the whole is a corrugated shape. Is. That is, the curve of the concave part b, the inclined surface c and the curve of the convex part a are formed smoothly and the same shape is repeatedly formed (in this embodiment, five ridges) to form the waveform shape of the end face 1a. It has been done.

  The assembling side pipe 2 is such that an uneven shape that can match the uneven shape formed on the end surface 1a of the assembled side pipe 1 is formed on the end surface 2a. In this embodiment, the uneven shape is Similar to the end face 1a of the assembled pipe 1 described above, the concave portion e (the bottom portion of the mountain) and the convex portion d (the top portion of the mountain) are curved so that the entire shape is corrugated. That is, the curve of the concave portion e, the curved surface of the inclined surface f, and the curve of the convex portion d are formed smoothly and the same shape is repeatedly formed (in this embodiment, five peaks) to form the waveform shape of the end surface 2a. It has been done.

  Thus, the concave portion b in the end surface 1a of the assembled pipe 1 and the convex portion d in the end surface 2a of the assembled pipe 2 and the convex portion a in the same end surface 1a and the concave portion e in the same end surface 2a are the same. It is a curve of curvature. Thus, when the end surface 1a of the assembled pipe 1 and the end surface 2a of the assembled pipe 2 are brought into contact with each other to form the contact portion A, the uneven shape of the end surface 1a and the uneven shape of the end surface 2a are accurately matched. Will be.

  Here, in the present embodiment, in the process of matching the end surface 1a of the assembly-side pipe 1 and the end surface 2a of the assembly-side pipe 2, as shown in FIG. 4, the inclined surface c and the end surface 2a of the end surface 1a. If the pipes 1 and 2 are moved in the axial direction so as to come close to each other with the inclined surface f in contact with each other, a direction in which the uneven shape of the end surface 2a matches the uneven shape of the end surface 1a by the action of a so-called cam. Can be guided to each other. Thereby, by aligning the concavo-convex shape of the end surface 2a of the assembled side pipe 2 with the concavo-convex shape of the end surface 1a of the assembled side pipe 1, the centering of the assembled side pipe 2 with respect to the assembled side pipe 1 (FIG. As shown in FIG. 1, positioning is performed so that the axial centers L of the pipes 1 and 2 are the same.

  Accordingly, by aligning the concave / convex shape of the end surface 2a of the assembled pipe 2 with the concave / convex shape of the end surface 1a of the assembled pipe 1, the centering of the assembled pipe 2 with respect to the assembled pipe 1 is naturally performed. Since it is performed stably, the positioning of the end faces 1a and 2a of the metal pipes (the assembled pipe 1 and the assembled pipe 2) can be performed easily and stably, and the end faces 1a and 2a are in contact with each other. A state can be maintained firmly.

  Furthermore, according to the present embodiment, since the contact portion A is formed by matching the concave and convex shapes in the assembled side pipe 1 and the assembled side pipe 2, the Y direction shown in FIG. Even when a load in the radial direction, a moment around the axis L, or the like is applied, the joined state (contact state) is firmly maintained. As shown in FIG. 1, even when a load is applied in the X direction (axis L direction) in the figure by being supported by the support pipes 3 and 4 when assembled as a handrail, The joined state (contact state) is maintained firmly. Therefore, welding to the contact portion A is not necessary, and a plurality of metal pipes can be assembled easily and inexpensively.

  In particular, in the present embodiment, as shown in FIG. 6, the uneven shape of the assembled pipe 1 and the uneven shape of the assembled pipe 2 are set so as to come into surface contact when matched. That is, the uneven edge surface 1b on the assembly-side pipe 1 side and the uneven edge surface 2b on the assembly-side pipe 2 side are joined in surface contact. Thereby, the joining state (contact state) of the uneven shape of the assembled side pipe 1 and the uneven shape of the assembled side pipe 2 is more stably and firmly maintained, and the strength of the contact portion A is further increased. Can be improved.

  However, in the present embodiment, the concavo-convex shape formed on the assembled side pipe 1 and the assembled side pipe 2 is formed at substantially equal intervals over the entire circumference of each of the pipes 1 and 2, and a concave portion ( b, e) or convex portions (a, d) are formed on the respective end faces 1a, 2a in odd numbers (5 in this embodiment, ie, 5 crests). As a result, as shown in FIG. 6, the portion facing the joint surface D (matching surface) between the uneven shape of the assembled pipe 1 and the uneven shape of the assembled pipe 2 on the axis L side The assembly-side pipe 1 or the assembly-side pipe 2 (a part that is not the joining surface D) is necessarily located.

  Therefore, the concavo-convex shape formed in the assembled side pipe 1 and the assembled side pipe 2 is formed at substantially equal intervals over the entire circumference of each of the pipes 1 and 2, and the concave portion or the convex portion is the end face of each. Therefore, even if a load is applied along the concave-convex joint surface D (matching surface), the load can be reliably received at the opposing portion, and the end surface 1a, It is possible to improve the bonding strength when a load is applied in the radial direction to the contact portions A between 2a.

  In this embodiment, the uneven | corrugated shape of the to-be-assembled side pipe 1 and the to-be-assembled side pipe 2 is formed by laser beam irradiation (cutting by laser irradiation). Thereby, the uneven shape can be formed easily and accurately, and the uneven shape of the end face of the assembled pipe 2 can be matched with the uneven shape of the end face of the assembled pipe 1 more accurately. In the present embodiment, the assembly-side pipe 1 or the assembly-side pipe 2 is moved (rotated or moved in the axial direction) while the laser irradiation position is fixed (the laser is directed to the axial core L). ), The concavo-convex edge surface 1b on the assembled pipe 1 side and the concavo-convex edge surface 2b on the assembled pipe 2 side are formed at the same angle. As described above, surface contact is possible at the time of joining.

  According to the present embodiment, by matching the concavo-convex shape of the end surface 2 a of the assembly-side pipe 2 with the concavo-convex shape of the end surface 1 a of the assembly-side pipe 1, Since centering is performed, it is possible to easily and stably position the end surfaces of the metal pipes (the assembled side pipe 1 and the assembled side pipe 2), and to firmly maintain the contact state between the end surfaces. In addition, a plurality of metal pipes can be assembled easily and inexpensively.

Moreover, since the uneven | corrugated shape formed in the to-be-attached side pipe 1 and the to-be-attached side pipe 2 consists of a waveform shape in which the recessed part and the convex part were made into the curve, the to-be-attached side pipe 1 and the attached side pipe 2 When the concave and convex shapes of the end faces 1a and 2a are matched, the end faces can be brought into contact with each other while avoiding an excessive concentrated load. As a reference example, if an excessive concentrated load can be avoided, for example, as shown in FIG. 7, an inclined surface f ′ extended while being inclined with respect to the extending direction (longitudinal direction) of the metal pipe. Examples thereof include c ′ (see (a) in the figure) or an uneven shape having inclined surfaces f ″ and c ″ (see (b) in the same figure) . Thus, if the inclined surfaces f′c ′ or f ″, c ″ are formed on the end surfaces of the assembled side pipe 1 and the assembled side pipe 2, when the end surfaces abut, Similarly, it will be assembled while centering.

  As mentioned above, although this embodiment was described, this invention is not limited to this, For example, the number (the number of mountains) of the uneven | corrugated shaped recessed part or convex part formed in the to-be-assembled side pipe 1 and the assembled side pipe 2 May be other than 5, 3 (3 peaks) as shown in FIG. 8, 2 (2 peaks) as shown in FIG. 9, or 4 (4 peaks) as shown in FIG. There may be. Of course, 6 or more may be sufficient as the number of the uneven | corrugated shaped recessed part or convex part (number of peaks).

  The pipe structure to be manufactured by assembling the pipe is not limited to the handrail as in the present embodiment, but can be obtained by assembling the assembled side pipe and the assembled side pipe (fence, ship or aircraft) It is also possible to use a pipe structure or the like on which a load such as luggage is placed and fixed.

By aligning the concavo-convex shape of the end surface of the assembly-side pipe with the concavo-convex shape of the end surface of the assembly-side pipe, the assembly-side pipe is centered with respect to the assembly-side pipe. The concavo-convex shape formed in the assembly side pipe and the assembly side pipe has a corrugated shape in which the concave portion and the convex portion are curved, and extends over the entire circumferential direction of the assembly side pipe and the assembly side pipe. If the pipe structure consists of an edge surface obtained by cutting by irradiating a laser beam toward the axis, and can be brought into surface contact when mating, it has a different appearance or has other functions added. It can also be applied to those that have been made.

Overall schematic view showing a pipe structure (handrail) according to an embodiment of the present invention The expanded perspective view which shows the state before attaching an assembly side pipe to the to-be-assembled side pipe in the same pipe structure. The expanded perspective view which shows the to-be-assembled side pipe and the front-end | tip part of an assembly side pipe in the same pipe structure Schematic diagram for explaining the process of assembling the assembly-side pipe to the assembly-side pipe in the pipe structure (the process of matching the uneven shape) The expanded perspective view which shows the state after the assembly | attachment side pipe is assembled | attached to the to-be-assembled side pipe in the same pipe structure. Sectional view taken along line VI-VI in FIG. The schematic diagram which shows the contact state of the to-be-assembled side pipe and assembly side pipe which concern on a reference example The schematic diagram which shows the assembled state of the to-be-assembled side pipe and the assembled side pipe according to yet another embodiment of the present invention (those having three concavo-convex shapes) and the state before the assembly. The schematic diagram which shows the assembled state of the to-be-assembled side pipe and the assembled side pipe, and the state before the assembly according to still another embodiment of the present invention (those having two concavo-convex shapes). The schematic diagram which shows the assembled state of the to-be-assembled side pipe and the assembled side pipe according to still another embodiment of the present invention (with four concavo-convex shapes) and the state before the assembly. Overall schematic diagram showing a conventional pipe structure (handrail)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Assembling side pipe 1a End surface 2 Assembling side pipe 2a End surface 3, 4 Prop pipe L Axis core A Contact part a, d Convex part (uneven shape)
b, e Concavity (concave / convex shape)
c, f Inclined surface (uneven shape)

Claims (2)

In a pipe structure obtained by assembling a plurality of hollow metal pipes,
A to-be-assembled side pipe having an uneven surface with an inclined surface extending while being inclined with respect to the extending direction;
An assembly-side pipe in which an uneven shape that can match the uneven shape formed on the end surface of the assembled pipe is formed on the end surface;
And aligning the concavo-convex shape of the end surface of the assembly-side pipe with the concavo-convex shape of the end surface of the assembly-side pipe, thereby centering the assembly-side pipe with respect to the assembly-side pipe. And the uneven shape formed on the assembled side pipe and the assembled side pipe has a corrugated shape in which the concave portion and the convex portion are curved, and the assembled side pipe and the assembled side. A pipe structure comprising an edge surface obtained by cutting by irradiating a laser beam toward an axial center along the entire circumference of the pipe, and capable of surface contact when matched. The uneven shape formed on the assembled side pipe and the assembled side pipe is formed at substantially equal intervals over the entire circumference of each pipe, and an odd number of concave portions or convex portions are formed on the respective end surfaces. The pipe structure according to claim 1, wherein the pipe structure is formed.

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