JP3401469B2 - Multi-stage lightning rod support pipe joint device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint device for a support pipe of a multistage lightning rod. 2. Description of the Related Art As shown in FIG. 3, a conventional multi-stage lightning rod support pipe coupling device has a lower portion fitted into the lower support tube 51 and a step portion 54 interposed therebetween. An annular joint fitting 53 whose upper portion has a diameter that is loosely fitted to the upper support tube 52 is welded to the lower support tube 51 in advance at a factory or the like,
The lower support tube 51 with the joint 53 welded in this way is carried to the construction site, and at the construction site, the upper support tube 52 is loosely fitted into the lower support tube 51 with the joint bracket 53 welded thereto. Bolt holes 5 drilled in
Bolts 57, 55 are attached to nuts 56 fixed to 5, 55, 55.
The lower support tube 51 and the upper support tube 52 are fastened by fastening
And a joint metal fitting 53 and an upper support tube 52 are welded for electrical connection between the lower support tube 51 and the upper support tube 52.
8 As welding at the construction site, arc welding or thermit welding is performed. In any case, the welding at the construction site, which is the connection of the joint of the conventional multistage lightning rod, is performed by welding. There is a problem of sparks, and this welding spark may stain or damage the surface material of the building near the construction site,
It is necessary to completely protect the building surface material during welding. On the roof of a building construction site where a multi-stage lightning rod is installed, there are many cases where the power source used for arc welding is restricted, and a great deal of time is required, such as laying electric cables over long distances to obtain the power source. It requires labor, and furthermore, the above-mentioned upper support pipe 52 and the joint fitting 53
This causes a problem that the straightness adjusted when assembling the lower support pipe 51 and the upper indicator pipe 52 is impaired due to welding deformation at the welding location, and the entire lightning rod may be bent. [0005] As described above, the connection of the joint portion of the conventional multi-stage lightning rod requires the skill of welding and also contributes to a decrease in work efficiency. Therefore, in order to solve the above-described problems, the present invention provides a method for connecting a joint between a lower support pipe and an upper support pipe by using electrical or mechanical connection without using arc welding or thermit welding at a construction site. It is an object of the present invention to provide a multi-stage lightning rod supporting pipe joint device which can obtain the following. [0006] A multi-stage lightning rod supporting pipe joint device according to the present invention has a tapered surface formed at the tip, and a lower supporting tube is provided below the tapered surface continuously with the tapered surface. A first joint fitting having a fittable tubular portion, an upper tubular portion into which an upper support tube can be fitted at an upper portion, and a divergent taper having the same angle as the tapered surface of the first joint fitting continuously connected to the tubular portion; A second joint fitting having a surface formed thereon and a tubular portion into which the tubular portion of the first joint fitting can be fitted continuously to the tapered surface, and a plurality of bolt insertion holes formed in the periphery of the tubular portion. The lower support pipe having a plurality of bolt insertion holes formed therearound is fitted and welded into the cylindrical portion of the first fitting, and the upper support pipe fitted and welded in the second fitting is provided. , Inserted from the tip of the first fitting fitting into which the lower support tube has been fitted,
The taper surface of the first fitting and the taper surface of the second fitting are brought into close contact with each other, and a bolt is screwed into a lower support pipe and a nut provided in a bolt insertion hole of the second fitting.
The second joint fitting, the first joint fitting, and the lower support tube and the upper support tube are fixed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. 1 is a cylindrical portion 2 having an inner diameter into which a lower supporting pipe 4 of a multi-stage lightning rod can be fitted; The lower support pipe 4 has a plurality of bolt insertion holes 5, 5, 5, 5, 5, 5. 5, ...
Are fixed to the bolt insertion holes 5, 5, 5,... By arc welding or the like. Then, the distal end of the lower support pipe 4 is fitted to the upper end of the cylindrical portion 2 of the first fitting 1, and after the fitting, the first fitting 1 and the lower support pipe 4 are fixed by arc welding 20 or the like. . Reference numeral 7 denotes a second joint fitting. The second joint fitting 7 has an upper cylindrical portion 8 having an inner diameter into which an upper support pipe 11 having an outer diameter capable of being inserted into the lower support pipe 4 can be fitted.
And the first joint fitting 1 continuously below the upper tubular portion 8.
A tapered surface 9 having the same angle as the tapered surface 3 and diverging downward is formed, and the inner diameter at which the cylindrical portion 2 of the first fitting 1 can be fitted downwardly continuously to the tapered surface 9. A lower cylindrical portion 10 is formed. A bolt insertion hole is provided around the lower cylindrical portion 10 of the second joint fitting 7, and nuts 12, 12, 12,... Are fixed to the bolt insertion hole by arc welding or the like. Have been. Then, the upper support tube 11 is fitted into the second fitting 7, and after the fitting, the upper tubular portion 8 of the second fitting 7 and the upper support tube 11 are arc welded 21 to fix them together. The first joint fitting 1 and the lower support pipe 4 are fixed together by arc welding 20 and the second joint fitting 7 is fixed to the upper support pipe 11 by arc welding. This is also carried out in advance in a factory or the like. In this way, the lower support pipe 4 having the first fitting 1 fixed to the tip and the upper support pipe 11 having the second fitting 7 fixed are manufactured at the factory. is there. The first fitting 1 manufactured in the above factory
In order to carry the lower support pipe 4 having the fins fixed at the tip thereof and the upper support pipe 11 having the second joint fitting 7 fixed thereto to the construction site and construct a multi-stage lightning rod, the loaded upper support pipe 1 is required.
1 and the lower support pipe 4 are lifted on the roof by a crane or the like, and the upper support pipe 11 is fixed to the upper part of the lower support pipe 4 from the upper side of the tapered surface portion 3 of the first joint fitting 1 while being laid on the roof. It is inserted until the tapered surface 3 of the first joint fitting 1 and the tapered surface 9 of the second joint fitting 7 fixed to the upper support tube 11 come into close contact. When the tapered surface 9 of the second fitting 7 fixed to the upper supporting tube 11 and the tapered surface 3 of the first fitting 1 fixed to the lower supporting tube 4 are in close contact with each other, the lower supporting tube 4 is closed. And the upper support pipe 11 are connected to each other, and after checking the straightness, bolts 22, 22, 2 are attached to nuts 12, 12, 12 welded to bolt insertion holes around the lower cylindrical portion 10 of the second joint fitting 7.
Then, the cylindrical portion 2 of the first fitting 1 inserted into the second fitting 7 is firmly fixed with the bolt 22 to integrate the second fitting 7 and the first fitting 1. Next, bolts 13, 13, 13 are screwed into nuts 6, 6, 6 which are fixed by welding or the like to bolt insertion holes 5, 5, 5 drilled around the lower support tube 4, respectively. By fixing the lower support tube 4 and the upper support tube 11 inserted in the lower support tube 4 and integrating them, a multi-stage lightning rod at the rooftop of a building site is assembled. Then, the multi-stage lightning rod assembled in a state of being laid down on the roof is erected at a predetermined position on the roof. In the present embodiment, the two pipes of the lower support pipe and the upper support pipe have been described, but the first fitting is welded to the tip of the upper support pipe, and the second fitting is attached to the third support pipe. By welding the metal fittings, three support pipes can be connected, and a plurality of support pipes can be sequentially added in the same manner. As described above, a lightning rod in which the lower support pipe 4 and the upper support pipe 11 are integrated is erected on the roof. In this erected state, the second lightning rod fixed to the upper support pipe 11 is used. Since the tapered surface 9 of the fitting 7 and the tapered surface 3 of the first fitting 1 fixed to the lower support tube 4 are in contact at the same angle taper surface, the surface of the contact surface depends on the weight of the upper support tube 11. It is expected that pressure will be maintained. When the multistage lightning rod according to the present embodiment receives a lightning current, it comes into contact with the second joint fitting via a second joint fitting welded to the upper supporting pipe from the upper supporting pipe at a tapered surface. The first joint fitting is energized to flow from the lower support pipe welded to the first joint fitting to the ground wire, and in the present embodiment, the flow of the lightning current is caused by the joint part in surface contact. In addition, since the joint fittings and the support pipes are welded, the flow of the lightning current is extremely good. As described above, according to the present embodiment, all the arc welding work is performed at the production factory, and at the construction site where the multi-stage lightning rod is to be constructed, the work is only fastening with bolts. Work is not performed at the construction site, so there is no risk of sparks being scattered by welding, so there is no need to protect the building surface material during welding as in the past, and secure a power supply for welding. Etc. can be reduced. In addition, the connection between the lower support pipe and the upper support pipe is a surface contact between the tapered surfaces formed on the first joint metal fitting and the second joint metal fitting fixed to both the support pipes. There is no bending of the lightning rod due to According to the multi-stage lightning rod supporting pipe joint device of the present invention, the taper surface of the first joint metal fitting and the taper surface of the second joint metal fitting have the same angle, and the first joint metal fitting is attached to the lower supporting pipe. The metal fittings are previously welded to the upper support pipe side with the second joint fitting at the upper part at the production factory, and when assembling the upper support pipe and the lower support pipe at the construction site, the first fitting metal fitting and the second fitting metal fitting are assembled. Since the tapered surface is brought into surface contact with the connection, the surface pressure of the contact surface is increased by the weight of the upper support pipe in the above-mentioned surface contact, and the first joint fitting is used to maintain the contact state. And the second joint fitting are firmly fixed with bolts from the outside of the second joint fitting, and sufficient electrical and mechanical effects can be obtained. In the present invention, as described above, the welding work is all performed in advance at a factory or the like. At the construction site of the lightning rod, only the mechanical work of bolting is performed. There is no need for any work such as protection work on the surface material of the building or securing of a power supply for welding.Therefore, since welding is not performed at the construction site, there is no bending of the lightning rod due to welding deformation, and straightness is guaranteed. Things.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a lower support pipe to which a first fitting is welded and an upper support pipe to which a second fitting is welded. FIG. 2 is an explanatory diagram in which an upper support tube is connected to a lower support tube. FIG. 3 is an explanatory view of a conventional multi-stage lightning rod coupling device. [Description of Signs] 1 First fitting 2 Cylindrical part 3 Tapered surface 4 Lower supporting pipe 7 Second fitting 8 Upper cylindrical part 9 Tapered surface 10 Lower cylindrical part 11 Upper supporting pipe

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Claims (1)

(1) A first joint fitting having a cylindrical portion having a tapered surface formed at a tip thereof and having a lower support pipe fitted downwardly continuously with the tapered surface. And, a divergent tapered surface having the same angle as the tapered surface of the first joint fitting is formed continuously with the upper cylindrical portion in which the upper support tube can be fitted in the upper portion and the cylindrical portion,
A second joint fitting having a plurality of bolt insertion holes formed around the cylindrical part is provided with a tubular part into which the tubular part of the first joint fitting can be fitted continuously to the tapered surface. The lower support pipe having a plurality of bolt insertion holes formed therein is fitted and welded into the cylindrical portion of the first fitting, and the upper support pipe fitted and welded in the second fitting is provided with the lower support. The pipe is inserted from the tip of the first fitting fitting into which the pipe is inserted, and the tapered surface of the first fitting fitting and the tapered surface of the second fitting fitting are brought into close contact with each other, and are provided in the lower support pipe and the bolt insertion holes of the second fitting fitting. A multi-stage lightning rod support pipe joint device, wherein a bolt is screwed into a nut, and the second joint fitting, the first joint fitting, and the lower support pipe and the upper support pipe are fixed.