JP2000008651A - Joining mechanism of hollow pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the joining mechanism of a hollow pipe capable of joining a hollow pipe without impairing strength of the hollow pipe. SOLUTION: The invention is the joining mechanism of a hollow pipe 10 for joining the hollow pipes through a joint 1. In the case, the hollow pipe 10 has a pipe expansion part 11 whose outside diameter is expanded on the end of a joined side. The joint 1 is one having a diameter expansion part 4 whose inside diameter is expanded so that the pipe expansion part 11 of the hollow pipe 10 abuts on one end side of a through hole by two ring-like member 2 having the through hole 3 capable of inserting the hollow pipe 10 in the inside respectively and comprises a clamp tool 8 for applying or approaching the ring-like members 2. The joining of the hollow pipes 10 is performed by application force produced at the time of applying or approaching those which insert the hollow pipe 10 in the ring-like member 2 and inset and fit the pipe expansion part 11 of the hollow pipe 10 and the diameter expansion part 4 of the ring-like member 2 by the clamp tool 8.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining mechanism for joining hollow tubes to each other. In particular, the present invention relates to joining hollow pipes where the joining operation is performed outdoors or where a quick operation is required. 2. Description of the Related Art Conventionally, when joining hollow tubes 50 made of, for example, galvanized steel tubes, they are joined by butt welding, or as shown in FIG.
The hollow tubes 50 were joined together by bolting the flanges 51 welded to each other. Further, when the train line support G is formed of a tubular member and has a gate-shaped structure including a power pole and a beam material, the power pole portion and the beam material portion are connected to each other by a curved pipe because the structure becomes a large structure. In this case, the connecting portion utilizes the connection by the flange 51 described above. [0003] Recently, it has been considered to form this from an extruded aluminum alloy material. It has also been known that the use of an aluminum alloy improves the workability by reducing the weight and does not cause corrosion unlike steel pipes, so that maintenance for corrosion prevention is not required and is convenient. [0004] However, when an aluminum alloy material is used as described above, when welding is performed, the strength of the welded portion W is reduced (FIG. 6 (a)). Therefore, for example, when it is applied to the train line support G, it is necessary to increase the wall thickness of the electric pole, the beam material, and the bent pipe to compensate for the strength, and the effect of the weight reduction by the aluminum alloy material cannot be fully exhibited. . In addition, there is a similar problem when an aluminum alloy material is used for other purposes. Furthermore, there is no effective method of joining hollow tubes when welding cannot be used for assembly in appearance. In the case where the flange is fixed by screws instead of welding, even if the shape of the hollow tube 50 is not circular, such as an elliptical shape, the flange must be circular in order to be screwed in. Problems such as the necessity of increasing the wall thickness of the pipe to increase the strength were the same as in the case of the above welding. Also, if steel pipes that do not cause problems due to welding are used for electric poles for railway train tracks, the weight becomes large when installing the utility poles, and the workability is poor,
The burden on the ground was great, and maintenance for corrosion protection was required. Accordingly, an object of the present invention is to provide a joining mechanism for a hollow tube capable of overcoming the conventional disadvantages and joining the hollow tubes without deteriorating the strength of the hollow tube. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first aspect of the present invention is a hollow tube for joining hollow tubes through a joint. A joining mechanism for pipes, wherein (A) the hollow pipe has an expanded pipe portion whose outer diameter is widened at an end on the side to be joined, and (A) the joints each include the hollow pipe inside. Two ring-shaped members having through-holes that can be inserted into the through-hole, and having an enlarged-diameter portion whose inner diameter is enlarged such that an enlarged-tube portion of the hollow tube abuts on one end side of the through-hole; and (C) joining the hollow tubes with each other by inserting one hollow tube into one ring-shaped member, and connecting the hollow tubes with each other. The expanded portion of the tube and the enlarged diameter portion of the ring-shaped member are inserted into each other, and the other hollow tube is connected to another ring-shaped member. The expanded portion of the hollow tube and the enlarged diameter portion of the ring-shaped member are inserted through the member, the inserted portions are opposed to each other at the portion having the enlarged diameter portion, and the one ring It is proposed to perform the pressing by a pressing force generated when pressing or approaching the ring-shaped member and the other ring-shaped member by the fastening tool. According to this, the hollow tubes can be securely joined without welding. The present invention also provides the hollow tube joining mechanism according to claim 1, wherein a core is installed between the hollow tubes when joining the hollow tubes. It is proposed (claim 2). According to this, the force against bending and the joint strength between the hollow tubes are further improved. Further, according to the present invention, the fastener is a bolt and a nut, and a plurality of bolt insertion holes for inserting the bolt are provided on an outer peripheral portion of the ring-shaped member. Alternatively, a joining mechanism for a hollow tube according to claim 2 is proposed (claim 3). According to this, the ring-shaped member can be securely tightened, and the hollow tubes can be firmly joined to each other. According to a fourth aspect of the present invention, in the hollow tube joining mechanism according to any one of the first to third aspects, the ring-shaped member is divided into a plurality of divided pieces and the positions thereof are shifted. And being crimped by the fastening tool. According to this, it is possible to connect even when the expanded portion is provided at both ends of the hollow tube. Further, the present invention is characterized in that the hollow tubes are joined to each other by bringing the end faces located at the tips of the expanded portions of the hollow tubes into contact with each other (claim 5). According to this, the hollow tubes can be surely joined to each other by the pressing force generated when the end surfaces of the hollow tubes are pressed against each other by the ring-shaped member. Further, in the present invention, the hollow pipes are joined to each other by bringing the expanded pipe inner faces, which are the inner faces of the expanded section of the hollow pipe, into contact with each other.
The present invention proposes a joining mechanism for a hollow tube according to any one of the above (Claim 6). According to this, the inner surfaces (back surfaces) of the expanded portion are brought into contact with each other, and this is strongly sandwiched by the ring-shaped members.
Strong hollow tubes can be joined to each other. In addition, if a bolt insertion hole for inserting a bolt is provided in the expanded portion, stronger joining can be achieved (claim 7). Further, according to the present invention, the hollow tube is made of an aluminum alloy.
A joint mechanism for a hollow tube according to any one of (1) to (3) is proposed. According to this, a hollow tube made of an aluminum alloy of an alloy type having a large decrease in strength due to welding can be securely joined, and since the aluminum alloy is lightweight, it can be handled more easily than a heavy galvanized steel tube. This facilitates the application of the aluminum alloy material to the structural material. Further, since the aluminum alloy is excellent in corrosion resistance, the maintenance work for corrosion prevention can be reduced. Finally, the joint mechanism of the hollow pipe according to the present invention is used for an electric pole or a beam constituting a train line support. A joining mechanism for a hollow tube is proposed (claim 9). According to this, the power poles and beams, which are large structures, can be reduced in weight and the installation work can be facilitated, and the installation work of the power poles can be performed efficiently even during the limited working time from the last train to the first train. it can. Further, the burden on the roadbed and the like is reduced. Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing joining of hollow tubes by a joining mechanism of hollow tubes according to the present invention. here,
(A) is a perspective view showing a state where hollow tubes are joined to each other, (b) is a cross-sectional view thereof, and (c) is a cross-sectional view of the hollow tube including an enlarged diameter portion. FIG. 2 is a diagram illustrating joining by hollow tubes of different variations. (A) is a sectional view showing a state in which hollow tubes having no bolt insertion holes are joined together, and (b) is a sectional view showing a state in which hollow tubes having bolt insertion holes are joined together; (C) is a sectional view of the hollow tube including the enlarged diameter portion. FIG. 3 is a view showing a joint and the like used for joining a hollow tube according to the present invention. (A) is a perspective view of a ring-shaped member, (b) is a cross-sectional view thereof,
(C) is a perspective view of the expanded hollow tube, and (d) is a perspective view of the core. FIG. 4 is a perspective view showing the joining of the hollow tubes when the ring-shaped member is of a split type. FIG. 5 is a diagram showing an example in which the present invention is applied to a portal-type structure including a power pole and a beam, which constitutes a train line support using the hollow tube joining mechanism according to the present invention. In FIGS. 1 to 5, reference numeral 1 denotes a joint, which comprises a pair of ring-shaped members 2 and a fastener 8. Reference numeral 10 denotes a hollow tube having an expanded portion 11 having an enlarged diameter at the end to be joined. The ring-shaped member 2 is provided with a through hole 3 at the center portion for inserting the hollow tube 10, and one end thereof (the side of the facing surface 6).
Is provided with an enlarged diameter portion 4 which is inserted (contacts) with the enlarged tube portion 11 of the hollow tube 10. As shown in FIGS. 3 (a) and 3 (b), the shape of the enlarged diameter portion 4 may be tapered linearly, parabolically narrowed, or
It may be one that progresses linearly from the facing surface 6 toward the outer surface 7 and then contracts at a stretch. The facing surface 6 is a portion of the ring-shaped member 2 having the enlarged diameter portion 4. When the hollow tubes 10 are joined to each other, one ring-shaped member 2 and another ring-shaped member 2 face each other. The surfaces 6 will be mounted so as to face each other. On the other hand, the outer surface 7 is a surface on the opposite side of the facing surface 6. The tightening tool 8 is for pressing and bringing the pair of ring-shaped members 2 into close contact with each other on the opposing surfaces 6, and may be, for example, a bolt 8a or a nut 8b. 5 (FIGS. 2 (a) (b)). The expanded portion 11 of the hollow tube 10 has a shape to be fitted (contacted) with the enlarged diameter portion 4 of the ring-shaped member 2. It is preferable that the expanded tube portion 11 and the enlarged diameter portion 4 have a shape that does not make a point contact but a surface contact, from the viewpoint of firmly joining the hollow tube. The method of providing the expanded portion 11 may be a method of directly expanding the end of the hollow tube 10 by mechanical force. Incidentally, the cross-sectional shape of the hollow tube 10 may be not only circular but also elliptical or square. In this case, at least the through hole 3 and the enlarged diameter portion 4 of the ring-shaped member 2 need to have a shape corresponding to the hollow tube 10 and the enlarged diameter portion 11. Further, it is preferable that the outer diameter of the ring-shaped member 2 be in a shape corresponding to the shape of the hollow tube 10 from the viewpoint of material saving and weight reduction and the aesthetic appearance. The joining of the hollow tubes in the present invention is shown in FIG.
In the example of (b), the hollow tube 10 is inserted into the through hole 3 of the ring-shaped member 2.
The hollow pipes 10 are connected to each other by facing each other with the facing surfaces 6 facing each other and tightening them with the fasteners 8 so that the enlarged diameter portions 4 and the expanded tube portions 11 are inserted (contacted) with each other. In such joining of the hollow tubes 10, the resistance to the pulling force that tends to separate the hollow tubes 10 from each other is assured by the expansion of the expanded portion 11 of the hollow tube 10 and the ring-shaped member 2. The strength of the material at the contact portion with the diameter portion 4 will depend on the strength of the material, and the resistance to the pressing force will depend on the strength of the end face 12 of the hollow tube 10. If the strength of the end face 12 of the hollow tube 10 is insufficient, the core body 20 shown in FIG. (Inner surface) (FIG. 1B). The core body 20 is shaped so as to prevent the end faces 12 of the hollow tube 10 from directly contacting each other, and the hollow body 10 (the inner surface of the expanded portion 11).
The contact area (contact surface 21) is preferably as wide as possible. By using such a core body 20, a force for pressing the hollow tubes 10 together is applied to the end faces 12.
Contact surface 21
Receiving and dispersing in a wide area, the resistance to pressing is improved. At the same time, in the case of the core 20 as described above, the expanded portion 11 of the hollow tube 10 is connected to the contact surface 21 of the core 20.
And the enlarged diameter portion 4 of the ring-shaped member 2, so that the resistance against pulling and the resistance against bending can be improved. The core body 10 may have a hollow ring shape. If it is a hollow ring shape, weight reduction can be achieved. When the core body 20 is not used, when the ring-shaped members 2 are tightened, the end face 1
It is desirable that the length L (FIG. 3C) of the expanded portion is longer than the depth of the enlarged diameter portion 4 so that the two directly contact each other. That is, when the hollow tube 10 is inserted through the ring-shaped member 2, it is preferable that the expanded portion of the hollow tube 10 slightly protrudes. If the end faces 12 of the hollow tubes 10 do not directly contact each other, the hollow tubes 10 will rattle even if the ring-shaped members 2 are firmly tightened.
Further, even when the end faces 12 of the hollow tube 10 are in direct contact with each other, it is preferable that the end faces 12 are not in point contact but are in surface contact over the entire circumference. When the hollow tube 10 is made of a material having a large elongation, the tip of the expanded portion 11 is further expanded until it is perpendicular to the axial direction of the hollow tube 10, and the inner surface (back surface) of the hollow tube 10 is formed. The hollow tube 10 is brought into contact with
If they are joined to each other, the expanded tube portion 11 is directly and firmly held between the ring-shaped members 2, and the joining strength is further increased (FIGS. 2A and 2B). In the case of FIG. 2B, a bolt insertion hole 13 is provided in the expanded portion 11 (FIG. 2C), and a bolt 8a for tightening the ring-shaped members 2 can be passed as it is. Therefore, the joining of the hollow tubes can be performed more firmly. In order to perform such joining, the hollow tube 10 is required.
Is preferably made of a material having a large elongation, and the cross-sectional shape of the hollow tube 10 is preferably a shape such as a circular shape that is easy to expand. In both of these examples, the core body 20 can be used, thereby further improving the bonding strength. The material used above is preferably an aluminum alloy. Aluminum alloys are attractive because of their light weight and high strength, but they have the disadvantage that the strength is greatly reduced by welding. In this regard, since the joining mechanism of the hollow pipe of the present invention does not perform welding, there is no reduction in strength due to welding, and the characteristics of the aluminum alloy can be fully utilized. For example, by using an aluminum alloy, when installing a portal-type structure composed of electric poles and beams constituting a train line support G as shown in FIG. Instead of relying on heavy equipment such as cranes, as is the case with conventional galvanized steel pipes, it can be performed to some extent by human power, greatly reducing installation time and limited time from the last train to the first train. There is a merit that work can be performed efficiently within. Next, the case where the ring-shaped member 2 is a split-type ring-shaped member 2 'will be described. This is a case where the ring-shaped member 2 is simply divided into a plurality of pieces along the axial direction. Good. Therefore, the material and the mechanism for joining the hollow tubes 10 to each other are the same as those described above, and thus the description thereof is omitted. Is provided at both ends of the hollow tube 10, the hollow tube joining mechanism of the present invention can be used. When the divided ring-shaped member 2 'is pressure-bonded with its facing surfaces 6 facing each other, the divided ring-shaped members 2' are not installed so that the divided portions 9 coincide with each other, but as shown in FIG. It is preferable to press-fit with the fastening tool 8 so that it is shifted. This is because, if the divided portions 9 are installed so as to coincide with each other, the divided ring-shaped member 2 ′ is easily detached from the joined hollow tube 10. Further, according to the joining mechanism of the hollow tubes according to the present invention, the hollow tubes 10 having different diameters can be joined. In this case, the diameter of the through hole 3 of the ring-shaped member 2 and the shape of the enlarged diameter portion 4 of the ring-shaped member 2 on the side where the small diameter hollow tube 10 is inserted correspond to the diameter of the hollow tube 10 and the shape of the enlarged diameter portion 11. It will be. The shape of the contact surface 21 of the core body 20 that contacts the small-diameter hollow tube 10 corresponds to the hollow tube 10. As described above, according to the present invention, the hollow tubes 10 can be securely joined to each other, and if the core 20 is provided, the hollow tubes 10 can be connected to each other. The resistance to the force for separating, pressing, and bending is improved. Since welding is not performed at the time of joining, the present invention is suitable for joining the hollow tube 10 made of a material such as an aluminum alloy, whose strength is greatly reduced by welding. When an aluminum alloy or the like is used, it is extremely light in weight as compared with a galvanized steel pipe. Therefore, a structure (a column-type overhead wire beam) is installed on a utility pole or the like constituting a train line support. Construction becomes easy, and the working time can be greatly reduced. In addition, since aluminum alloy has corrosion resistance, there is an advantage that labor required for maintenance can be reduced. Further, the hollow tubes 10 having different diameters can be joined to each other.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing joining of hollow tubes by a joining mechanism of hollow tubes according to the present invention. (A) is a perspective view showing a state where hollow tubes are joined to each other, (b) is a cross-sectional view thereof, and (c) is a cross-sectional view of the hollow tube including an enlarged diameter portion. FIG. 2 is a view showing joining by different variations of hollow tubes. (A) is sectional drawing which shows the state which joined the hollow pipes which do not have a bolt insertion hole,
(B) is a sectional view showing a state in which hollow tubes having bolt insertion holes are joined to each other, and (c) is a sectional view of the hollow tube including an enlarged diameter portion. FIG. 3 is a view showing a joint and the like used for joining a hollow tube according to the present invention. (A) is a perspective view of a ring-shaped member, (b) is a cross-sectional view thereof, (c) is a perspective view of an expanded hollow tube, and (d) is a perspective view of a core body. is there. FIG. 4 is a perspective view showing the joining of the hollow tubes when the ring-shaped member is of a split type. FIG. 5 is a diagram showing an example in which the present invention is applied to a portal-type structure including a power pole and a beam constituting a train line support using the hollow tube joining mechanism according to the present invention. FIG. 6 is a diagram showing joining of a hollow tube by a flange using conventional welding. (A) is a perspective view,
(B) shows a sectional view thereof. [Description of Signs] 1 Joint 2 Ring-shaped member 2 'Split-type ring-shaped member 3 Through hole 4 Large diameter portion 5 Bolt insertion hole 6 Opposing surface 7 Outer surface 8 Fastening tool 8a Bolt 8b Nut 9 Split portion 10 Hollow tube 10a Straight (one end expanded) 10b Straight (both ends expanded) 10c Elbow (both ends expanded) 11 Expanded part 11a Expanded surface 11b Expanded back 12 End 13 Bolt insertion hole 20 Core 21 Contact surface 50 Hollow tube (not expanded) 51 Flange F Foundation G Train line support (gate type structure) L Length of expanded portion W Welded portion

Claims (1)

Claims: 1. A hollow tube joining mechanism for joining hollow tubes via a joint, which has the following features. (A) The hollow tube has an expanded portion having an enlarged outer diameter at the end on the side to be joined. (A) The joint is two ring-shaped members each having a through hole through which the hollow tube can be inserted, so that the expanded portion of the hollow tube abuts one end of the through hole. And a fastener for crimping or bringing the ring-shaped members into close contact with each other. (C) The joining of the hollow tubes is performed by inserting one hollow tube into one ring-shaped member, and inserting and fitting the expanded portion of the hollow tube and the expanded portion of the ring-shaped member. The other hollow tube is inserted into the other ring-shaped member, and the expanded portion of the hollow tube and the expanded portion of the ring-shaped member are inserted into each other. The portions having the portions are opposed to each other, and the pressing is performed by a pressing force generated when the one ring-shaped member and the other ring-shaped member are pressed or brought close to each other by the fastener. 2. When joining the hollow tubes,
2. The hollow tube joining mechanism according to claim 1, wherein a core is disposed between the hollow tubes. 3. The bolt according to claim 1, wherein the fastener is a bolt and a nut, and a plurality of bolt insertion holes for inserting the bolt are provided on an outer peripheral portion of the ring-shaped member. The joining mechanism of the hollow tube as described in the above. 4. The ring-shaped member according to claim 1, wherein the ring-shaped member is divided into a plurality of divided pieces, and the ring-shaped member is crimped by a fastener while being shifted in position. Hollow tube joining mechanism. 5. The hollow tubes are joined to each other by bringing the end faces located at the tip of the expanded portion of the hollow tubes into contact with each other, thereby joining the hollow tubes. Hollow tube joining mechanism. 6. The hollow pipes according to claim 1, wherein the hollow pipes are joined by bringing the expanded pipe inner faces, which are inner faces of the expanded section of the hollow pipe, into contact with each other. Hollow tube joining mechanism. 7. The hollow tube joining mechanism according to claim 7, wherein a plurality of bolt insertion holes for inserting the bolts are provided in an expanded portion of the hollow tube. 8. The hollow tube joining mechanism according to claim 1, wherein said hollow tube is made of an aluminum alloy. 9. The joining mechanism for a hollow tube according to claim 1, wherein the joining mechanism for the hollow tube is a utility pole or a beam for a train line support.