JP5203532B2 - Steel pipe pole and manufacturing method thereof - Google Patents

Description

  The present invention relates to a steel pipe pole having a lamp that illuminates a road, and a steel pipe column that supports the lamp, and a method for manufacturing the same.

  Specifically, for example, the present invention relates to a steel pipe pole using a circular steel pipe used for street lights, signals, and the like, and a method for manufacturing the same.

  A steel pipe pole using a circular steel pipe used for street lamps, signals, etc. has an opening for storing electrical parts and the like.

  Various proposals have been made regarding steel pipe poles. For example, Patent Document 1 listed below discloses a steel pipe pole having a lamp that illuminates a road, a solar panel that supplies power to the lamp, and a micro wind power generator. By having an emergency light box equipped with a portable emergency light that is charged by the power supplied from the solar panel and the micro wind power generator, even if the battery is damaged due to bad weather or earthquake, the steel tube pole can Steel pipe poles that can illuminate remote roads, accident vehicles, victims, etc. are described.

  However, since the conventional steel tube pole described in Patent Document 1 is installed and operated for electric parts of the lamp, the reinforcing member of the opening provided on the outer periphery of the lower portion of the steel tube column is welded, so that fatigue fracture In addition to being a cause, there is a problem that the reinforcing member protrudes from the outer periphery of the steel pipe column, which impairs safety and aesthetics.

JP 2008-176935 A

  The present invention solves the problems of the prior art as described above, and it is not necessary to weld the reinforcing member of the opening provided on the outer periphery of the lower part of the steel pipe column, and the reinforcing member does not protrude to the outer periphery of the steel pipe column. It is an object of the present invention to provide a steel pipe pole excellent in safety and aesthetics and a manufacturing method thereof.

In order to solve the above-mentioned problems, the present invention has been made as a result of intensive studies on the reinforcement structure of the opening provided on the outer periphery of the lower part of the steel pipe column, and the gist of the invention is within the scope of the claims. It is the following contents as described.
(1) A steel pipe pole having a lamp for illuminating a road and a steel pipe column that supports the lamp, and has an opening in the outer periphery of the lower part of the steel pipe column, and an end of the opening is made of a steel pipe column. Reinforcing members made of mutually parallel ribs bent in a V shape on the inner side and continuously projecting in a direction perpendicular to the opening in the inner direction of the steel pipe column at symmetrical positions in the cross section The steel tube pole is characterized in that the width W is 0.1 to 0.3 times the outer diameter D of the steel tube column, and a reinforcing member having a thickness equal to that of the steel tube column is formed.
(2) The steel pipe pole according to (1), wherein a detachable lid is provided in the opening, and the outer peripheral surface of the lid is continuous with the outer peripheral surface of the steel pipe column without a step.
(3) A method of manufacturing a steel pipe pole according to (1) or (2), wherein after preparing an opening in the outer periphery of the lower part of the steel pipe column, the end of the opening is bent by pressing. A method of manufacturing a steel pipe pole, comprising forming a reinforcing member made of a rib continuously projected in an inner direction of a steel pipe column.

<Action>
According to the steel pipe pole of the invention of (1), it has an opening in the outer periphery of the lower part of the steel pipe column, the end of the opening is bent inside the steel pipe column, and continuously in the inner direction of the steel pipe column. Since the reinforcing member made of the protruded rib is formed, the welded portion of the reinforcing member in the opening is not necessary, so that the fatigue strength is high.
(2) According to the steel pipe pole of the present invention, the detachable lid is provided, and the outer peripheral surface of the lid is continuous with the outer peripheral surface of the steel pipe column without a step, so that the reinforcing member protrudes to the outer periphery of the steel pipe column. Because it is not safe and aesthetic.
According to the method for manufacturing a steel pipe pole of the invention of (3), after opening a pilot hole in the outer periphery of the lower part of the steel pipe column, the end of the opening is bent by pressing and continuously in the inner direction of the steel pipe column. In order to form a reinforcing member consisting of ribs that are protruded, there is no need to weld the reinforcing member in the opening, so the fatigue strength is high, and the reinforcing member does not protrude on the outer periphery of the steel pipe column, so it is safe and aesthetic The manufacturing cost of an excellent steel pipe pole can be reduced.

  According to the present invention, there is no need to weld the reinforcing member of the opening provided on the outer periphery of the lower portion of the steel pipe column, and the steel pipe pole excellent in safety and aesthetics, in which the reinforcing member does not protrude from the outer periphery of the steel pipe column, and its A manufacturing method can be provided, and there are significant industrially useful effects.

It is a figure which illustrates the conventional steel pipe pole. It is detail drawing which illustrates the opening part in the steel pipe pole of this invention. It is a cross-sectional view which illustrates embodiment of the steel pipe pole of this invention. It is a figure which illustrates the manufacturing method of the steel pipe pole of this invention.

  EMBODIMENT OF THE INVENTION The form for inventing is demonstrated in detail using FIGS. 1-3. FIG. 1 is a diagram illustrating a conventional steel pipe pole. In FIG. 1, 1 is a lamp, 2 is a steel pipe column, 3 is an opening, and 4 is a switch mounting plate.

  As shown in FIG. 1, a conventional steel pipe pole has a lamp 1 that illuminates a road and a steel pipe column 2 that supports the lamp 1, and a switch mounting plate for installing a connection terminal of the lamp 1, a breaker, and the like. In order to install and operate, the opening 3 is provided on the outer periphery of the lower part of the steel pipe column 2 and the reinforcing member of the opening 3 is welded. It is necessary to increase the cross-sectional secondary moment by projecting about 2 mm on the outer periphery of 2, and there is a problem that the safety and appearance are impaired.

  2 is a detailed view illustrating an opening in a steel pipe pole of the present invention, FIG. 3 is a cross-sectional view thereof, and in FIGS. 2 and 3, 2 is a steel pipe column, 3 is an opening, and 4 is a switch. A mounting plate, 5 is a lid, 6 is a bolt, 7 is a ground terminal, 8 is a reinforcing member, and 9 is a packing.

  As shown in FIGS. 2 and 3, the steel pipe pole of the present invention is a steel pipe pole having a lamp 1 that illuminates a road and a steel pipe column 2 that supports the lamp 1. It has an opening 3 on the outer periphery, and an end of the opening 3 is bent inside the steel pipe column 2 to form a reinforcing member made of a rib that continuously protrudes in the inner direction of the steel pipe column 2. Features.

  That is, instead of the conventional reinforcing member of the opening 3, the opening 3 is provided on the outer periphery of the lower portion of the steel pipe column 2, and the end of the opening 3 is bent inside the steel pipe column 2, By forming the reinforcing member 8 composed of ribs continuously projecting in the inner direction, it is not necessary to weld the reinforcing member in the opening provided on the outer periphery of the lower part of the steel pipe column 2, and the reinforcing member is the steel pipe column 2. It is possible to provide a steel pipe pole excellent in safety and appearance that does not protrude from the outer periphery of the steel tube.

  The opening 3 shown in FIGS. 2 and 3 is provided with the center of the opening 3 at a position of 0.5 to 1 m from the ground so that an operator can easily perform the installation work such as a breaker. Also, as shown in FIG. 3, a piece 8 'is formed at the end of the opening 3, and subsequently bent into a V shape inside the steel pipe column 2 so as to be symmetric with respect to the transverse section. A reinforcing member 8 made of ribs parallel to each other and continuously projected in the inner direction of the steel pipe column is provided. In the present invention, the installation direction of the reinforcing member 8 is not limited, but the installation direction of the reinforcing member 8 is preferably perpendicular to the opening 3 in order to facilitate press working.

  In the present invention, the size of the reinforcing member 8 is not limited, but the width W is preferably 0.1 to 0.3 times the outer diameter D of the steel pipe column 2 and the plate thickness is preferably equal to that of the steel pipe column 2. By making the width W 0.1 times or more the outer diameter D of the steel pipe column 2, the section modulus is reinforced by the opening 3, while the width W exceeds 0.3 times the outer diameter D of the steel pipe column 2. This is because there is a possibility that the installation work of the breaker or the like may be hindered.

  As shown in FIGS. 2 and 3, a detachable lid 5 covering the opening 3 is detachably provided with a bolt 6 through a rubber packing 9, and the outer peripheral surface of the lid 5 is formed of the steel pipe. It is preferable that there is no step with the outer peripheral surface of the column.

  In the present invention, the manufacturing method of the steel pipe pole is not limited. After the opening 3 is formed in the outer periphery of the lower part of the steel pipe column 2 by punching or the like, the end of the opening 3 is used as a mold. By forming a reinforcing member made of ribs bent by press working and continuously protruding in the inner direction of the steel pipe column 2, there is no need to weld the reinforcing member in the opening, so that the fatigue strength is high and the reinforcing member However, since it does not protrude from the outer periphery of the steel pipe column, the manufacturing cost of the steel pipe pole excellent in safety and aesthetics can be reduced.

  FIG. 4 is a diagram illustrating a method of manufacturing a steel pipe pole according to the present invention, where (a) is a state before pressing, (b) is a first stage of pressing, and (c) is a second stage of pressing. Indicates. First, as shown in (a), the steel pipe column 2 subjected to the pilot hole machining is leveled and set in a press machine by machining or the like. Next, as shown in (b), as a first stage of pressing, the entire pressing die 10 is pressed down to press the opening 3 to form a piece. Then, as shown in (c), as a second stage of press working, the central portion of the pressing die 10 indicated by the oblique lines is further pushed down to press the tip of the opening 3 to form a reinforcing member made of a rib. Since the work hardening occurs by the above press work, the strength of the steel pipe column can be improved.

The steel pipe pole of this invention shown in FIGS. 2-3 was implemented on condition of the following using the manufacturing method shown in FIG.
<Conditions for implementation>
-Outer diameter D of steel pipe column lower part: 139 to 190 mm, plate thickness: 4.5 mm
-Outer diameter D 'of steel pipe column tip: 75.0 mm, plate thickness: 4.5 mm
-Opening length L: 600 mm
-Opening processing method: Machining-Reinforcement member (rib) width W: 20-40 mm, plate thickness: 4.5 mm

  As a result, there is no need to weld the reinforcing member of the opening provided on the outer periphery of the lower part of the steel pipe column, and the steel pipe pole excellent in safety and aesthetics, in which the reinforcing member does not protrude on the outer periphery of the steel pipe column, and its manufacturing method. The effect of the present invention was confirmed.

  Since the steel pipe pole of the present invention is being planned and is excellent in safety and aesthetics, it is expected to be expanded to a wide range of local governments in the future.

DESCRIPTION OF SYMBOLS 1 Lamp 2 Steel pipe pillar 3 Opening part 4 Switch mounting plate 5 Lid 6 Bolt 7 Grounding terminal 8 Reinforcement member 8 'piece 9 Packing 10 Push type

Claims (3)

A steel pipe pole having a lamp for illuminating a road and a steel pipe column that supports the lamp, and has an opening at the outer periphery of the lower part of the steel pipe column, and an end of the opening is V inside the steel pipe column. Reinforcement member made of mutually parallel ribs that are bent in a letter shape and project continuously in a direction perpendicular to the opening in the inner direction of the steel pipe column at a symmetrical position in the transverse section W is a steel pipe pole characterized by forming a reinforcing member 0.1 to 0.3 times the outer diameter D of the steel pipe pillar and having a plate thickness equal to that of the steel pipe pillar .   The steel pipe pole according to claim 1, wherein a detachable lid is provided in the opening, and an outer peripheral surface of the lid is continuous with an outer peripheral surface of the steel pipe column without a step.   The method of manufacturing a steel pipe pole according to claim 1 or 2, wherein an opening is drilled in the outer periphery of a lower part of the steel pipe column, and then an end of the opening is bent by press working. A method of manufacturing a steel pipe pole, comprising forming a reinforcing member made of a rib continuously projected in an inward direction.

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