JP2008019708A - Reinforcing structure of side wall opening part of metallic pipe column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of an opening part of a metallic pipe column for hardly causing stress concentration, even when a repetitive vibration load is applied to the opening part of the metallic pipe column. <P>SOLUTION: The reinforcing structure of the opening part of the metallic pipe column is a reinforcing structure of an opening part 2 formed in a side wall of the metallic pipe column, wherein a frame-shaped reinforcing member 22 is connected by butt welding over the whole periphery on the inner periphery of a cutout end surface 21 of the circular- or oval-shaped opening part 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a reinforcing structure for an opening portion of a metal tube strut formed on a side wall of a metal tube strut made of a metal tube, which is used for a road lighting pole, a traffic signal pole, an electric road sign pole, and the like.

  It is necessary to attach electrical equipment such as a switchboard or a control panel in the vicinity of the base portion of the metal pipe column made of the metal pipe used for the pole as described above. When these are housed inside the metal tube strut, an opening is formed on the side wall of the metal tube strut.

  After the electric device is inserted into the metal tube from the opening, the opening is covered with a lid. The lid is designed to have a sealing property so that rainwater can be prevented from entering the inside of the metal tube from the opening, and can be easily opened and closed for inspection or the like.

  However, conventionally, there has been little consideration on the rigidity of such openings and lids. The opening of the metal tube column tends to be a weak point in strength, and bending stress and torsional load are repeatedly applied to the metal tube due to wind, earthquake, traffic vibration, etc., receiving vibration load and stress concentration occurs in the opening. Cheap. Therefore, there is a problem that the opening may become a starting point of breakage and lead to breakage of the pole.

  In Patent Document 1, as a means for preventing the deformation of the opening formed on the side wall of the metal tube column due to the low rigidity of the opening of the metal tube column made of such a metal tube, the following (1 Three of (3) to (3) have been proposed.

  (1) Two bracing members are attached to diagonal positions on the outer periphery of the rectangular opening to prevent the opening from being deformed. The frame body is fillet welded to the outer surface of the outer periphery of the opening, and the lid is fixed to the frame body with bolts.

  (2) The frame body is fillet welded to the outer surface of the outer periphery of the rectangular opening, and a reinforcing plate that also serves as a lid is fitted into the inner periphery of the frame body, and the reinforcing plate is fixed to the frame body with bolts. , Preventing deformation of the opening.

  (3) On the outer surface of the outer periphery of the rectangular opening, attach a reinforcing plate that also serves as a lid so as to cover the entire opening, and fix the reinforcing plate to the outer surface of the outer periphery of the opening with bolts to deform the opening To prevent.

  Similarly, Non-Patent Document 1 describes the following (4) as a reinforcing structure for the opening of the metal tube support column.

  (4) R (roundness) is given to the corner of the rectangular opening, and a U-shaped frame is welded to the outer surface of the outer periphery of the opening, and a lid is placed outside the frame. And the lid is fixed to the frame with two bolts to prevent deformation of the opening.

  However, the reinforcing structure of these openings is not sufficient. This will be described below with reference to the drawings.

(1) Reinforcement with bracing members:
FIG. 8 is a front view of a conventional example showing reinforcement by a bracing member, in which four holes 3 are formed at diagonal positions on the outer periphery of the opening 2 of the metal tube 1, and the two bracing members 4 are on the diagonal line. Attached to. Furthermore, the frame body 5 is fillet welded to the outer surface of the metal tube on the outer periphery of the opening. A lid (not shown) is attached to the frame body 5 by a lid fitting 6. In this case, the bracing member suppresses the deformation of the opening when the metal tube receives a torsional load, but the opening is rectangular, so when receiving a repeated vibration load, the rectangular opening Stress concentration easily occurs at the corner portions 7 of the two.

(2) Reinforcement via a frame with a reinforcing plate that also serves as a lid:
FIG. 9 is a perspective view of a conventional example showing reinforcement through a frame by a reinforcing plate that also serves as a lid, and the frame 5 is fillet welded to the outer surface of the metal tube on the outer periphery of the opening of the metal tube 1. A reinforcing plate 8 having a peripheral wall 10 that also serves as a lid is fitted into the inner periphery of the frame body, and the reinforcing plate 8 is fixed to the frame body on the peripheral wall 1 by eight bolts 9. In this case, the reinforcing plate suppresses the deformation of the opening when the metal tube receives a torsional load, but the rigidity of the frame and the reinforcing plate becomes a problem. Further, when the vibration load is repeatedly applied, the opening and the frame are rectangular, and stress concentration tends to occur in both the opening and the corner of the frame.

(3) Reinforcement with a reinforcing plate that also serves as a lid:
FIG. 10 is a perspective view of a conventional example showing reinforcement by a reinforcing plate that also serves as a lid. A reinforcing plate 8 that also serves as a lid is provided on the outer surface of the metal tube on the outer periphery of the opening of the metal tube 1 so as to cover the entire opening. The reinforcing plate is fixed to the outer surface of the opening by six bolts 9. Also in this case, the reinforcing plate suppresses the deformation of the opening when the metal tube receives a torsional load, but the rigidity of the reinforcing plate becomes a problem. Further, when subjected to repeated vibration loads, stress concentration tends to occur at the corners of the opening.

(4) Reinforcement by frame:
11 (a) is a front view of a prior art example showing the reinforcement of the opening by the frame, and FIG. 11 (b) is a cross-sectional view taken along the D-D plane of the opening 2 shown in FIG. 11 (a) . The corner 7 of the rectangular opening 2 of the metal tube 1 is rounded by R40, and a U-shaped frame 5 is fillet welded to the outer surface of the outer periphery of the opening. This frame has bolt holes 12, a lid (not shown) is attached to the outside of the frame, and the lid is fixed to the frame by bolts 9. In this case, the frame suppresses the deformation of the opening when the metal tube receives a torsional load, but stress concentration tends to occur in the column side vicinity 13 where the frame forms a corner. Further, although R40 is formed at the corner 7 of the rectangular opening of the metal tube, it is insufficient to prevent stress concentration, and stress concentration tends to occur at the corner of the opening. Furthermore, since the metal pipe and the frame are welded to the fillet, stress concentration occurs at the weld toe. Therefore, when receiving a repeated vibration load, in the column side vicinity 13 where the frame body forms a corner, the corner portion 7 of the rectangular opening of the metal tube, and the fillet welded portion 11 of the frame body and the metal tube, Fatigue failure can occur.

JP 2002-275841 A “Road / Tunnel Lighting Equipment Specifications” p.2-10, published in April 2001, Construction Electrical Engineering Association of Japan

  Any of the above-described reinforcing structures for the opening of the metal tube strut can withstand a static bending load and a torsional load applied to the metal tube strut, but is insufficient when subjected to repeated vibration loads. Because metal pipe columns used as road lighting poles, traffic signal poles, lightning-type road sign poles, etc. are in the form of simple cantilevers and are installed outdoors, This is because it receives repeated wind loads and vibration loads due to earthquakes and traffic vibrations. Since the reinforcement structure of the opening portion of the metal tube strut of the conventional example is not uniform in bending rigidity, stress concentration occurs in the opening portion or the corner portion of the frame body, and there is a possibility that fatigue failure may occur.

  Furthermore, in the above-described conventional reinforcing structure, since the frame body, the lid, or the mounting bolt protrudes from the outer surface of the metal tube strut, there is a possibility that it may become an obstacle for pedestrians passing near the metal tube strut.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems and to provide a reinforcing structure for an opening of a metal tube strut that is less likely to cause stress concentration even when repeated vibration loads are applied to the opening of the metal tube strut. And

The reinforcing structure of the opening portion of the metal tube strut of the present invention is characterized in that a frame-shaped reinforcing member is joined to the inner periphery of the cut-out end surface of the circular or oval opening portion by butt welding. .

  Although there is no restriction | limiting in particular as a metal pipe used for the metal pipe support | pillar which concerns on this invention, A steel pipe, a stainless steel pipe, an aluminum pipe etc. are preferable.

  The cross-sectional shape of the metal tube used for the metal tube support is not particularly limited, and various shapes of metal tubes such as a circle, a rectangle, a hexagon, and an octagon can be used. A circular metal tube is preferable from the viewpoint of workability.

  Since the frame-shaped reinforcing member according to the present invention is joined to the inner periphery of the opening by butt welding over the entire periphery, the rigidity can be increased more effectively than installing the reinforcing member at other locations, and the direction The difference in rigidity due to can be reduced. In addition, by adjusting the thickness of the frame of the reinforcing member, the difference in rigidity between the notch portion and the actual meat portion of the metal tube strut can be reduced. From this point also, the difference in rigidity and strength depending on the direction can be reduced. Can be reduced.

  In this reinforcing structure, it is preferable that the reinforcing member has a curved shape on the outer surface so that the reinforcing member protrudes from the metal pipe column and does not disturb the pedestrian.

In addition, this reinforcement structure is normally used with the lid attached to the reinforcement member except during inspection, but the lid does not protrude from the metal tube strut so as not to obstruct the pedestrian. In addition, it is preferable to attach a lid to the outer surface of the reinforcing member via a packing so that rainwater does not enter between the reinforcing member and the lid.

  Preferred embodiments of the present invention are shown below.

FIG. 1 is an example of a reinforcing structure for an opening of a metal tube strut according to the present invention. Here, FIG. 1A is a front view of the opening formed in the side wall of the metal tube column, and FIG. 1B is a cross-sectional view taken along line AA of the opening 2 in FIG. Here, the opening 2 is circular, and a frame-shaped reinforcing member 22 is joined to the notch end face 21 of the opening over the entire circumference of the notch end face by butt welding.

FIG. 2 is another example of the reinforcing structure of the opening portion of the metal tube strut according to the present invention, and is a front view of the opening portion formed on the side wall of the metal tube strut. Here, the opening 2 has an oval shape, and an oval frame-shaped reinforcing member 22 is joined to the notch end surface 21 of the opening over the entire inner periphery of the notch end surface by butt welding. ing.

FIGS. 3-6 is another example of the reinforcement structure of the opening part of the metal pipe support | pillar concerning this invention, Comprising: It is a schematic diagram of the horizontal sectional view of the opening part formed in the side wall of a metal pipe support | pillar. 3 is a cross-sectional shape of a metal tube as a metal tube column, FIG. 4 is an octagonal cross-section of a metal tube as a metal tube column, and FIG. 5 is a cross-sectional shape of a metal tube as a metal tube column. Is an example of a hexagonal shape, and FIG. 6 shows an example in which the cross-sectional shape of a metal tube serving as a metal tube column is square. In any case, a frame-shaped reinforcing member 22 is joined to the notch end surface 21 of the opening part by butt welding over the entire inner periphery of the notch end surface.

The frame-shaped reinforcing member is installed over the entire inner periphery of the notch end face of the opening, and then butt-welded with the opening of the metal pipe column . The butt welds because is achieved the integration of the opening and the reinforcing member of the metal tube posts. Accordingly, frame-like reinforcing member, it is preferable to use a steel material superior in weldability with notch end surface at the opening of the metal tube posts. In addition, since the frame-shaped reinforcement member of this invention is installed over the perimeter of the notch end surface of an opening part, butt welding is possible. When the frame-shaped reinforcing member is welded to the inner periphery of the notched end face of the opening by butt welding, unlike the fillet welding used for conventional reinforcing member welding, integrated welding Therefore, the frame-shaped reinforcing structure of the opening can sufficiently prevent the occurrence of deformation. Note that the material of the frame-shaped reinforcing member may be the same as or different from the material of the metal tube.

FIG. 7 is another example of the reinforcing structure of the opening of the metal tube strut according to the present invention. Here, FIG. 7 (a), the opening 2 is formed in the metal pipe posts made of a metal tube 1 of circular cross-section, joined by butt welding a frame-like reinforcing member 22 in the notch end surface 21 of the opening is a front view of things, FIG. 7 (b) is a side view thereof. The frame-shaped reinforcing member is provided with a bolt hole 25 for attaching a lid (not shown).

  Since the lid is fixed to the reinforcing member with a bolt, it can be easily removed at the time of maintenance of electrical equipment or the like.

  According to the reinforcing structure of the opening portion of the metal pipe support of the present invention, stress concentration is unlikely to occur even if repeated vibration loads are applied to the opening portion provided on the outdoor pole. Can be prevented.

It is an example of the reinforcement structure of the opening part of the metal pipe support | pillar concerning this invention. Here, Fig.1 (a) is a front view of the opening part formed in the side wall of a metal pipe support | pillar, and shows an example with a circular opening part. FIG.1 (b) is AA sectional drawing of the opening part 2 of FIG. A frame-shaped reinforcing member is joined to the inner periphery of the notch end face of the opening over the entire periphery by butt welding . It is another example of the reinforcement structure of the opening part of the metal pipe support | pillar concerning this invention, Comprising: It is a front view of the opening part formed in the side wall of a metal pipe support | pillar, and an opening part shows the example of an oval. A frame-shaped reinforcing member is joined to the inner periphery of the notch end face of the opening over the entire periphery by butt welding . It is another example of the reinforcement structure of the opening part of the metal tube support | pillar concerning this invention, Comprising: It is a horizontal sectional view of the opening part formed in the side wall of a metal tube support | pillar, and the cross-sectional shape of the metal tube used as a metal tube support | pillar is It is an example of a circle and schematically shows a frame-shaped reinforcing member joined by butt welding over the entire circumference of the notch end face of the opening. It is another example of the reinforcement structure of the opening part of the metal tube support | pillar concerning this invention, Comprising: It is a horizontal sectional view of the opening part formed in the side wall of a metal tube support | pillar, and the cross-sectional shape of the metal tube used as a metal tube support | pillar is It is an example of an octagon, and schematically shows a frame-shaped reinforcing member joined by butt welding over the entire circumference of the notch end face of the opening. It is another example of the reinforcement structure of the opening part of the metal tube support | pillar concerning this invention, Comprising: It is a horizontal sectional view of the opening part formed in the side wall of a metal tube support | pillar, and the cross-sectional shape of the metal tube used as a metal tube support | pillar is It is an example of a hexagon, and schematically shows a frame-shaped reinforcing member joined by butt welding over the entire circumference of the notch end face of the opening. It is another example of the reinforcement structure of the opening part of the metal tube support | pillar concerning this invention, Comprising: It is a horizontal sectional view of the opening formed in the side wall of a metal tube support | pillar, and the shape of the metal tube used as a metal tube support | pillar is a square It is an example of this, Comprising : The frame-shaped reinforcement member currently joined to the inner periphery of the notch end surface of an opening part by butt welding over the perimeter is shown typically. It is another example of the reinforcement structure of the opening part of the metal pipe support | pillar concerning this invention. Here, FIG. 7 (a) shows an example in which an opening is formed in a metal tube column made of a metal tube having a circular cross section, and a reinforcing member is joined by butt welding to the inner periphery of the notch end surface of the opening over the entire circumference. is a front view, FIG. 7 (b) is a side view thereof. The frame-shaped reinforcing member is provided with a bolt hole for attaching a lid (not shown). It is a front view of the prior art example which shows reinforcement by a brace member. It is a perspective view of the prior art example which shows reinforcement through the frame by the reinforcement board which serves as a lid | cover. It is a front view of the perspective view of the prior art example which shows the reinforcement by the reinforcement board which serves as a lid | cover. 11 (a) is a front view of a prior art example showing the reinforcement of the opening by the frame, FIG. 11 (b) is a sectional view along D-D surface of the opening portion 2 of FIG. 11 (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Opening part 3 Hole 4 Bracing member 5 Frame body 6 Lid attaching bracket 7 Corner part 8 Reinforcing board which serves as a lid 9 Bolt 10 Perimeter wall 11 Fillet weld part 12 Bolt hole 13 The column side in which a frame makes a corner Near 21 Opening notch end face 22 Reinforcement member 25 Bolt hole

Claims (4)

  A structure for reinforcing an opening formed on a side wall of a metal tube strut, in which a frame-shaped reinforcing member is joined to the inner periphery of a cut-out end face of a circular or oval opening by butt welding over the entire circumference Reinforcement structure of the opening of the pipe support.   The reinforcing structure of the opening portion of the metal pipe column according to claim 1, wherein the reinforcing member has a curved surface shape on an outer surface.   The reinforcing structure of the opening portion of the metal tube strut according to claim 1, wherein a lid is attached to the reinforcing member. The reinforcement structure of the opening part of the metal pipe | column support | pillar of Claim 3 which attaches a cover to the outer surface of a reinforcement member via packing.

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