JP2005023536A - 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, causing little stress concentration, even if a repetitive vibration load is applied to the opening part of the metallic pipe column. <P>SOLUTION: This reinforcing structure of the opening part of the metallic pipe column is characterized by arranging a frame-shaped reinforcing member 22 over the whole periphery on the inner periphery of a cutout end surface 21 of the opening part 2 formed on a side wall of the metallic pipe column composed of a metallic pipe 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
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.
[0003]
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.
[0004]
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.
[0005]
In Patent Document 1, as a means for preventing deformation of the opening formed in 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.
[0006]
(1) Two bracing members are attached to diagonal positions on the outer periphery of the rectangular opening to prevent deformation of the opening. 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.
[0007]
(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.
[0008]
(3) A reinforcing plate also serving as a lid is attached to the outer surface of the outer periphery of the rectangular opening so as to cover the entire opening, and the reinforcing plate is fixed to the outer surface of the outer periphery of the opening with bolts, and the opening is deformed. To prevent.
[0009]
Similarly, Non-Patent Document 1 describes the following (4) as the reinforcing structure of the opening of the metal tube support column.
[0010]
(4) R (roundness) is given to the corner of the rectangular opening, 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.
[0011]
However, the reinforcing structure of these openings is not sufficient. This will be described below with reference to the drawings.
[0012]
(1) Reinforcement with bracing members:
FIG. 10 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.
[0013]
(2) Reinforcement via a frame with a reinforcing plate that also serves as a lid:
FIG. 11 is a perspective view of a conventional example showing reinforcement through a frame body using a reinforcing plate that also serves as a lid. The frame body 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. In addition, when subjected to repeated vibration loads, the opening and the frame are rectangular, and stress concentration is likely to occur in both the opening and the corners of the frame.
[0014]
(3) Reinforcement with a reinforcing plate that also serves as a lid:
FIG. 12 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.
[0015]
(4) Reinforcement by frame:
Fig.13 (a) is a front view of the prior art which shows reinforcement of the opening part by a frame, FIG.13 (b) is sectional drawing in the DD plane of the opening part 2 of Fig.13 (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.
[0016]
[Patent Document 1] Japanese Patent Laid-Open No. 2002-275841 [Non-Patent Document 1] “Road / Tunnel Lighting Equipment Specifications” p. 2-10, issued in April 2001, Construction Electrical Engineering Association of Japan [0017]
[Problems to be solved by the invention]
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.
[0018]
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.
[0019]
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
[0020]
[Means for Solving the Problems]
The reinforcement structure of the opening part of the metal pipe support | pillar of this invention has a frame-shaped reinforcement member over the perimeter in the inner periphery of the notch end surface of a circular or oval opening part, It is characterized by the above-mentioned.
[0021]
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.
[0022]
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.
[0023]
Since the frame-shaped reinforcing member according to the present invention is installed on the inner periphery of the opening over the entire circumference, the rigidity can be increased more effectively than when the reinforcing member is installed in other locations, and the rigidity depending on the direction can be increased. The difference 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.
[0024]
In this reinforcing structure, it is preferable that the metal pipe column and the reinforcing member are integrated by butt welding. And it is preferable that a reinforcement member has a curved surface shape in an outer surface so that a reinforcement member may protrude from a metal pipe support | pillar and may not become a pedestrian.
[0025]
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. Therefore, the shape of the lid is preferably fitted into the frame of the reinforcing member, and the lid is attached to the outer surface of the reinforcing member via a packing so that rainwater does not enter between the reinforcing member and the lid. preferable.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention are shown below.
[0027]
Fig.1 (a) is a front view of the opening part formed in the side wall of a metal pipe support | pillar, FIG.1 (b) is AA sectional drawing of the opening part 2 of FIG. Here, the opening 2 is circular, and a donut-shaped frame-shaped reinforcing member 22 is provided on the notch end surface 21 of the opening over the entire circumference of the notch end surface.
[0028]
FIG. 2 is a front view of an opening formed in the side wall of the metal tube support column. Here, the opening 2 has an oval shape, and a frame-shaped reinforcing member 22 of an elliptical donut is provided on the notch end surface 21 of the opening over the entire circumference of the notch end surface. .
[0029]
3-6 is a schematic diagram of a horizontal cross-sectional view of an opening formed in the side wall of the metal tube support column. 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 provided on the notch end surface 21 of the opening over the entire inner periphery of the notch end surface.
[0030]
FIG. 7A shows a state in which an opening is formed in a metal tube column made of a metal tube having a circular cross section, and a frame-shaped reinforcing member 22 is provided over the entire inner periphery of the notch end surface 21 of the opening. Furthermore, it is sectional drawing of what inserted the lid | cover 23 in the frame of the reinforcement member. And FIG.7 (b) is an expanded sectional view of the B section of Fig.7 (a). Here, the outer surface 24 of the frame-shaped reinforcing member has a curved surface shape. The material of the frame-shaped reinforcing member may be the same as or different from the material of the metal tube.
[0031]
The reinforcing member is preferably installed on the inner periphery of the end face of the opening over the entire circumference, and then butt welded to the opening of the metal pipe column. This is because, in the butt weld portion 27, the opening of the metal pipe column and the reinforcing member are integrated. Therefore, it is preferable to use a steel material having excellent weldability at the opening with the metal pipe column as the reinforcing member. In addition, since the reinforcement member of this invention is installed over the perimeter in the inner periphery of the end surface of an opening part, butt welding is possible. When the reinforcing member is welded by butt welding, unlike the fillet welding used for welding of the conventional reinforcing member, integrated welding is possible, so the reinforcing structure of the opening is deformed. Occurrence can be sufficiently prevented.
[0032]
FIG. 8 (a) is a front view of a metal tube strut made of a metal tube 1 having a circular cross section, in which an opening 2 is formed, and a frame-shaped reinforcing member 22 is provided on a notch end surface 21 of the opening, FIG. 8B is a side view thereof. The frame-shaped reinforcing member is provided with a bolt hole 25 for attaching a lid (not shown).
[0033]
FIG. 9 shows a case where an opening is formed in a metal tube column made of a metal tube 1 having a circular cross section, a frame-shaped reinforcing member 22 is provided on a notch end surface 21 of the opening, and a lid is further provided through a packing 26. It is a horizontal sectional view of what fitted 23 in the frame of a reinforcing member. The packing is provided to prevent rainwater from entering between the lid 23 and the reinforcing member 22.
[0034]
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.
[0035]
【The invention's effect】
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.
[0036]
[Brief description of the drawings]
FIG. 1 (a) is a front view of an opening formed in a side wall of a metal tube column, and shows an example in which the opening is circular. FIG.1 (b) is AA sectional drawing of the opening part 2 of FIG. A frame-shaped reinforcing member is attached to the inner periphery of the notch end surface of the opening over the entire periphery.
FIG. 2 is a front view of an opening formed on a side wall of a metal tube column, and shows an example in which the opening is oval. A frame-shaped reinforcing member is attached to the inner periphery of the notch end surface of the opening over the entire periphery.
FIG. 3 is a cross-sectional view of an opening formed on a side wall of a metal tube strut, in which the cross-sectional shape of the metal tube serving as the metal tube strut is a circular shape, and is entirely formed on the inner periphery of the notch end surface of the opening. The frame-shaped reinforcement member attached over a periphery is shown typically.
FIG. 4 is a cross-sectional view of an opening formed on a side wall of a metal tube strut, in which the cross-sectional shape of the metal tube serving as the metal tube strut is an octagonal shape, on the inner periphery of the notch end surface of the opening The frame-shaped reinforcement member attached over a perimeter is shown typically.
FIG. 5 is a cross-sectional view of an opening formed on a side wall of a metal tube strut, in which the cross-sectional shape of the metal tube that becomes the metal tube strut is an example of a hexagon, and the inner periphery of the notch end surface of the opening The frame-shaped reinforcement member attached over a perimeter is shown typically.
FIG. 6 is a cross-sectional view of the opening formed on the side wall of the metal tube strut, in which the shape of the metal tube serving as the metal tube strut is an example of a quadrangle, and the entire circumference of the notch end surface of the opening The frame-shaped reinforcement member attached over is shown typically.
FIG. 7 (a) shows an opening formed in a metal tube column made of a metal tube having a circular cross section, and a frame-shaped reinforcing member is provided on the entire inner periphery of the notch end surface of the opening. It is sectional drawing of what attached the lid | cover further on. FIG.7 (b) is an expanded sectional view of the B section of Fig.7 (a).
FIG. 8 (a) is a front view of an opening formed in a metal tube column made of a metal tube having a circular cross section, and a reinforcing member provided on the inner periphery of the cut-out end surface of the opening. FIG. 8B is a side view thereof.
FIG. 9 shows an opening formed in a metal tube column made of a metal tube having a circular cross section, a reinforcing member is provided on the inner periphery of the cut-out end surface of the opening, and a lid is further provided through a packing. It is sectional drawing of what is attached.
FIG. 10 is a front view of a conventional example showing reinforcement by a bracing member.
FIG. 11 is a perspective view of a conventional example showing reinforcement through a frame by a reinforcing plate that also serves as a lid.
FIG. 12 is a front view of a perspective view of a conventional example showing reinforcement by a reinforcing plate also serving as a lid.
FIG. 13 (a) is a front view of a conventional example showing reinforcement of an opening by a frame, and FIG. 13 (b) is a DD plane of the opening 2 of FIG. 13 (a). It is sectional drawing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal pipe 2 Opening part 3 Hole 4 Bracing member 5 Frame body 6 Lid attachment metal fitting 7 Corner 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 end notch 22 Reinforcing member 23 Lid 24 Reinforcing member outer surface 25 Bolt hole 26 Packing 27 Butt weld

Claims (6)

A reinforcing structure for an opening formed on a side wall of a metal tube strut, comprising a frame-shaped reinforcing member on an inner periphery of a cut-out end surface of a circular or oval opening. Reinforcement structure of the opening of the column. The reinforcing structure of a column opening according to claim 1, wherein the reinforcing member and the metal tube column are integrated by butt welding. The reinforcing structure of the opening portion of the metal tube strut 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 any one of claims 1 to 3, wherein a lid is attached to the reinforcing member. The structure for reinforcing an opening of a metal tube strut according to claim 4, wherein the lid is fitted into the frame of the reinforcing member. The reinforcing structure of the opening portion of the metal tube strut according to claim 4 or 5, wherein a lid is attached to the outer surface of the reinforcing member via a packing.

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