JP5833384B2 - Metal tube pillar - Google Patents

Description

  The present invention relates to a metal tube column used for installation of road lighting, a traffic signal, an electric road sign, and the like, and particularly to a metal tube column having an opening on an outer peripheral surface of a metal tube main body.

  Conventionally, since it is necessary to attach electrical equipment such as a switchboard or a control panel to a metal tube column used for road lighting etc., an opening is formed on the side wall near the base of the metal tube column, Usually, a lid for closing the opening is attached.

  If an opening is provided in the side wall of a metal tube column used for road lighting, etc., a defect occurs in the cross section in the direction perpendicular to the tube axis of the metal tube column at the location where the opening is provided. The cross-sectional performance in the direction perpendicular to the tube axis is reduced. A large static load is applied to the metal tube column due to a bending load or the like due to its own weight or the like of the lighting equipment or the metal tube column, but the rigidity of the metal tube column with respect to the static load decreases due to the deterioration of the cross-sectional performance. It will be.

  On the other hand, electrical equipment installed inside metal tube pillars used for road lighting etc. is installed, inspected, exchanged, etc. through the opening, so depending on the shape and size of electrical equipment etc. The minimum opening size required for operation and removal of equipment must be secured.

  Therefore, Patent Document 1 and Patent for the purpose of ensuring the minimum opening size and the rigidity against static load of the metal tube column at the opening of the side wall of the metal tube column used for road lighting or the like. The structure of the reinforcing member disclosed in Document 2 has been conventionally proposed. The configuration of the reinforcing member disclosed in Patent Document 1 and Patent Document 2 includes a reinforcing frame on the outer surface side of the metal tube column over the entire periphery of the opening of the side wall of the metal tube column used for road lighting and the like. An oval steel member or the like is provided. And according to the structure of the reinforcement member disclosed by this patent document 1 and patent document 2, the cross-sectional performance of the pipe axis perpendicular | vertical direction of the metal pipe pillar in the location in which the opening part was provided, ensuring the minimum opening dimension. Can be suppressed, and the rigidity of the metal tube column against static load can be ensured.

  However, when a reinforcing frame, an oval steel member, or the like is provided on the outer surface side of the metal tube column as in the metal tube columns disclosed in Patent Document 1 and Patent Document 2, these reinforcing members are the metal tube columns. Therefore, there is a possibility that the vehicle or a pedestrian passing near the metal pipe column may come into contact with the vehicle, resulting in a problem in traffic.

  In addition, in order to provide a reinforcing member such as a reinforcing frame or an oval steel member at the curved portion of the opening, such as the metal tube pillar disclosed in Patent Document 1 and Patent Document 2, a metal tube The process which curves and bends the outer peripheral surface of a main body, and the process of welding the curved reinforcing member to the curved part are needed. And since the process and the welding which bend the curved part require advanced technology, the process of providing a reinforcing member at the curved part of the opening is more difficult than the process of providing the reinforcing member at the straight part. There was a problem that the cost required for processing was also high.

  Furthermore, like the metal tube pillar disclosed in Patent Document 1 and Patent Document 2, the reinforcement member is provided over the entire circumference of the opening, so that the reinforcement member is provided only in the straight portion. As a result, the amount of steel material used as the reinforcing member is increased, resulting in a problem that the economy is lowered.

JP 2011-38311 A JP 2004-92254 A

  Accordingly, the present invention has been made to solve the above-described problems, and the object of the present invention is to disperse the stress that repeatedly acts on the opening, to secure a minimum opening size, and to statically An object of the present invention is to provide a metal tube column having an opening provided with a reinforcing member easily and economically so as to ensure rigidity against a load and further prevent the reinforcing member from hindering traffic.

The metal tube column according to claim 1 is a metal tube column including a metal tube main body and an opening formed on an outer peripheral surface thereof, and both sides extending substantially linearly toward the tube axis direction. An opening having an upper end that is curved upward in the tube axis direction so as to be continuous from both sides thereof, and a part or all of both sides of the opening from the inside toward the inside of the metal tube body only and a reinforcing member provided in a convex shape, the upper end, the curvature in the vicinity of the portion contiguous with substantially straight above both sides is rather smaller than the curvature of the arc of diameter equal to the spacing of the both sides The reinforcing member is provided not to be provided at the upper end portion but to protrude only along the both sides .

Metal Kanbashira according to the claims 2, in a metal tube column according to claim 1, the opening is to have a lower end which is curved in the axial direction of the tube downwards so as to continue from the both sides The reinforcing member is provided not to be provided at the lower end portion but to protrude only along the both sides .

The metal tube column according to claim 3 is a metal tube column including a metal tube main body and an opening formed on an outer peripheral surface thereof, and both side sides curved outward in the tube axis vertical direction, and both side sides thereof. an opening having a lower end which is curved upper portion which is curved in the axial direction of the tube upwardly so as to be continuous and axial direction of the tube downwardly from, from all parts of both sides of the opening, towards the interior of the metal tube body A reinforcing member provided in a convex shape only on the inner side, and the upper end portion and the lower end portion are portions in which the curvature in the vicinity of the portion continuous with the both sides on which the reinforcing member is provided is the continuous portion. smaller than the curvature of the arc gap equal to the diameter of the both sides in the curvature of the upper portion and the lower end portion, Ri of curvature than the size der of the both sides, the reinforcing member, the upper end and the Without being provided at the lower end, only on both sides Characterized in that it is provided to protrude me.

  The metal tube column according to claim 4 of the present application is the metal tube column according to any one of claims 1 to 3, wherein the outer periphery is located above the opening in the tube axis direction of the outer peripheral surface of the metal tube main body. It has the convex part provided in convex shape toward the outer side of the surface, It is characterized by the above-mentioned.

  The metal tube pillar of the present invention has both ends of the upper end portion curved upward in the tube axis direction so as to continue from both sides extending substantially linearly toward the tube axis direction in the opening formed in the side wall. By forming the curvature in the portion continuous from the side smaller than the curvature of the circular arc having the same diameter as the distance between both sides, it is possible to disperse the stress that repeatedly acts on the opening. In addition, by providing a reinforcing member provided in a convex shape only on the inside toward the inside of the metal tube main body from a part or all of both sides of the opening, a minimum opening dimension is secured and static It is possible to easily and economically provide the reinforcing member so that the rigidity against the load is secured and the reinforcing member does not hinder traffic.

It is the whole figure (a) of the side direction of the metal pipe pillar used for the road lighting etc. to which this invention is applied, and the whole figure (b) of the back direction. It is a front view of the opening part formed in the outer peripheral surface of the base vicinity of the metal pipe column to which this invention is applied. It is AA sectional drawing (a) of the pipe-axis perpendicular direction in the location in which the opening part of the metal tube pillar to which this invention is applied is formed, and AA sectional drawing (b) of one Example. It is BB sectional drawing of the pipe-axis direction in the location in which the opening part of the metal pipe pillar to which this invention is applied is formed. It is a front view of one Example about the opening part formed in the side wall near the base part of the metal pipe pillar to which this invention is applied. It is AA sectional drawing of the pipe-axis perpendicular direction in the location in which the opening part of the metal pipe pillar to which this invention shown in FIG. 5 is applied is formed. It is BB sectional drawing of the pipe-axis direction in the location in which the opening part of the metal pipe pillar to which this invention shown in FIG. 5 is applied is formed. It is a front view of one Example about the opening part formed in the side wall near the base part of the metal pipe pillar to which this invention is applied. It is a front view of one Example about the opening part formed in the side wall near the base part of the metal pipe pillar to which this invention is applied. It is a front view of one Example about the opening part formed in the side wall near the base part of the metal pipe pillar to which this invention is applied. It is a front view of one Example about the opening part formed in the side wall near the base part of the metal pipe pillar to which this invention is applied. The front view (a) which attached the lid so that the opening formed in the side wall near the base part of the metal tube pillar to which the present invention was applied and fixed it with the bolt, and the lid fitted to the opening with the bolt It is the fixed front view (b). AA cross-sectional view (A) in the direction perpendicular to the tube axis of the metal tube column attached with a lid so as to cover the opening formed in the side wall near the base of the metal tube column to which the present invention is applied and fixed with bolts; It is AA sectional drawing (b) of the pipe-axis perpendicular | vertical direction of the metal pipe pillar which fixed the lid fitted to the opening part with the volt | bolt.

  Hereinafter, as a form for implementing this invention, the metal pipe pillar used for a road illumination etc. is demonstrated in detail with reference to drawings.

  FIG. 1A is an overall view in a side surface direction of a metal tube column 1 used for road lighting or the like, and FIG. 1B is an overall view in a back surface direction. 2 and 5 are front views of the opening 10 formed in the outer peripheral surface 8a in the vicinity of the base 2 of the metal tube column 1. FIG. 3 and 6 are cross-sectional views taken along line AA in the direction perpendicular to the tube axis at a location where the opening 10 of the metal tube column 1 is formed. 4 and 7 are BB cross-sectional views in the tube axis direction at a location where the opening 10 of the metal tube column 1 is formed. Here, FIGS. 2 to 4 show the reinforcing member 9 welded, and FIGS. 5 to 7 show the reinforcing member 9 by bending the side wall 8.

  The metal tube column 1 is built in the ground 3 at the base 2, the tube 4 of the metal tube main body is extended upward from the base 2, and the lighting equipment 6 is provided at the top 5 at the tip of the tube 4. It is configured.

  The tube body 4 has a side wall 8 that forms a hollow portion 7 inside the metal tube column 1. The tubular body 4 has an outer peripheral surface 8 a formed by a side wall 8. In the tubular body 4, an opening 10 provided with a reinforcing member 9 is formed on the outer peripheral surface 8 a near the base 2. The cross-sectional shape of the tube body 4 in the direction perpendicular to the tube axis is circular, but is not limited thereto, and may be a square, a rectangle, a hexagon, an octagon, or the like. The material of the pipe body 4 is not particularly limited, but a steel pipe, a stainless steel pipe, an aluminum pipe or the like is desirable.

  The opening 10 includes a side 11 extending linearly in the tube axis direction, an upper end 12 curved upward in the tube axis direction so as to continue from both sides 11, and a tube extending continuously from both sides 11. It has a lower end portion 13 curved downward in the axial direction.

  The curvature of the upper end portion 12 in the portion continuous from the both sides 11 is formed smaller than the curvature of the arc having the same diameter as the interval between the sides 11. For example, the upper end portion 12 is formed in a semi-elliptical arc shape. Here, the semi-elliptical arc is a semi-circular arc that is flattened in the direction perpendicular to the tube axis of the metal tube column 1, and an ellipse having a major axis in the tube axis direction of the metal tube column 1 is divided into two equal parts. It means the circumference of one of the half ovals.

  The curvature of the lower end portion 13 in the portion continuous from the both sides 11 is formed smaller than the curvature of the arc having the same diameter as the interval between the sides 11. For example, the lower end portion 13 is formed in a semi-elliptical arc shape. The shape of the lower end portion 13 is not limited to this and may be any shape. For example, FIG. 8 is a front view of one embodiment of the opening 10 formed in the side wall 8 near the base 2 of the metal tube pillar 1 to which the present invention is applied. As shown in FIG. 8, the lower end portion 13 may be formed in a semicircular arc shape curved downward in the tube axis direction. Further, the lower end portion 13 may be formed in a continuous linear shape at the lower ends of the side edges 11.

  Both sides 11 may be curved outward in the direction perpendicular to the tube axis, and the curvatures of upper end 12 and lower end 13 may be larger than the curvatures of both sides 11. For example, FIG.9 and FIG.10 is a front view of one Example about the opening part 10 formed in the side wall 8 vicinity of the base 2 of the metal pipe pillar 1 to which this invention is applied. The opening 10 is formed in an elliptical arc shape. Here, FIG. 9 shows the reinforcing member 9 welded, and FIG. 10 shows the reinforcing member 9 by bending the side wall 8.

  The reinforcing member 9 is provided in a convex shape only on the inner side from the both sides 11 of the opening 10 toward the hollow portion 7. The reinforcing member 9 may be formed by bending the side wall 8 as shown in FIG. 6, and welded with a metal plate, welded with a thick member, as shown in FIG. A meat member joined by pressure welding or the like may be used. As the reinforcing member 9, a member obtained by partially reinforcing the side wall 8 itself may be used. The reinforcing member 9 may be a flat plate or a flat plate that is partially curved or cut out. As the reinforcing member 9, a member made of any material such as metal, wood, resin or the like may be used in any shape such as circular, elliptical, L-shaped, H-shaped, rectangular, triangular, polygonal, and U-shaped. The reinforcing member 9 may use a piece of metal, wood, resin or the like for thick welding or additional reinforcement in a gap formed by the inner wall 14 of the metal tube column 1 and the reinforcing member 9 such as a metal plate.

  The reinforcing member 9 is provided perpendicular to the flat surface 15 having both sides 11 on the same plane. Not only this but the angle (theta) of the reinforcement member 9 with respect to the flat surface 15 can be changed suitably. The angle θ of the reinforcing member 9 with respect to the flat surface 15 may be inclined toward the inner wall 14 so that the reinforcing member 9 is close to the inner wall 14, or the reinforcing member 9 is inclined toward the flat surface 15 side. It may be a thing.

  The upper end of the reinforcing member 9 may be provided only from a part of the both sides 11 so as not to extend to the upper end point 16 which is a point that becomes a boundary between the both sides 11 and the upper end portion 12. The lower end of the reinforcing member 9 may be provided only from a part of the both sides 11 so as not to extend to the lower end point 17 which is a point that becomes a boundary between the both sides 11 and the lower end portion 13. The reinforcing member 9 is not limited to this, and may be provided not only from a part of both side edges 11 but also from all of the side edges 11 from the upper end point 16 to the lower end point 17. The reinforcing member 9 is provided continuously without being interrupted with the center in the tube axis direction of the both sides 11 as the center. Not only this but the reinforcement member 9 may be provided intermittently from each side 18. The reinforcing member 9 may be provided only from either one of the side edges 11.

  The outer peripheral surface 8 a may include a convex portion 19 provided in a convex shape toward the outside of the side wall 8 above the opening 10 in the tube axis direction. FIG. 11 is a front view of one embodiment of the opening 10 formed in the side wall 8 in the vicinity of the base 2 of the metal tube pillar 1 having the convex portion 19. The convex portion 19 may be curved upward in the tube axis direction, or may be formed in a mountain shape having a vertex that is convex upward in the tube axis direction. The convex portion 19 can be used by joining members such as a circular cross section, an elliptical cross section, an L-shaped cross section, a rectangular cross section, a triangular cross section, a polygonal cross section, and a U-shaped cross section by welding, pressure welding, or the like. The convex part 19 can also be used by protruding in a convex shape with the side wall 8 facing outward.

  FIG. 12 is a front view of the metal tube column 1 in which the lid 20 is attached to the opening 10 and fixed by the bolt 21. FIG. 12A shows a case in which the lid 20 is attached so as to cover the opening 10 and fixed with bolts 21. FIG. 12B shows the lid 20 fitted in the opening 10 with bolts 21. It is fixed. FIG. 13A is a cross-sectional view taken along the line AA in the direction perpendicular to the tube axis of the metal tube column 1 with the lid 20 attached so as to cover the opening 10, and FIG. It is AA sectional drawing of the pipe-axis perpendicular | vertical direction of the metal pipe pillar 1 which 20 was fitted. In FIG. 12A, the lid 20 is locked with the bolt 21 in the vicinity of the upper end 12 of the opening 10 and the lower end 13 of the opening 10, but as shown in FIG. 13A. Alternatively, the opening 10 may be locked in the vicinity of both sides 11. Further, as shown in FIG. 12B, when the lid 20 is fitted into the opening 10, packing or the like may be interposed at a portion where the lid 20 and the opening 10 are in contact with each other. For locking the lid 20, a rivet or the like can be used in addition to the bolt 21.

  Next, the effect | action of the metal pipe pillar 1 to which this invention is applied is demonstrated. In general, stress caused by traffic vibration or the like that occurs daily due to traffic of a vehicle or the like repeatedly acts on the metal tube pillar 1 used for road lighting or the like. Since the opening 10 is provided, a part of the side wall 8 is deficient. Therefore, stress that repeatedly acts due to traffic vibration or the like is concentrated on the opening 10. When the upper end portion 12 of the opening 10 has a semicircular arc shape, the difference in curvature between the both sides 11 and the upper end portion 12 at the upper end point 16 is large. Therefore, the stress acting repeatedly on the opening portion 10 has a difference in curvature. Concentrate on the large top point 16. When the lower end portion 13 of the opening 10 is semicircular, the difference in curvature between the side 11 and the lower end 13 at the lower end point 17 is large. However, it concentrates on the lower end point 17 where the difference in curvature is large.

  In the present invention, as shown in FIGS. 2 and 5, the difference in curvature between the side 11 and the upper end 12 at the upper end point 16 can be reduced by forming the upper end 12 in a semi-elliptical arc shape or the like. . Therefore, stress concentration at the upper end point 16 where the curvature changes can be avoided, and the stress that repeatedly acts on the metal tube column 1 can be dispersed in a wide range in the opening 10.

  In this invention, as shown in FIG.2 and FIG.5, the difference in curvature of the both-sides 11 and the lower end part 13 in the lower end point 17 can be made small by making the lower end part 13 into a semi-elliptical arc shape. Therefore, stress concentration at the lower end point 17 where the curvature changes can be avoided, and bending stress among the stresses repeatedly acting on the metal tube column 1 can be dispersed in a wide range in the opening 10.

  In addition, when the effective height L of the opening 10 is constant, when the lower end portion 13 has a semicircular arc shape, the lower end portion 13 is formed in a straight line shape or the like as compared with the lower end portion 13 having a semielliptical arc shape or the like. The extension of the both sides 11 made becomes longer. Therefore, a large opening area can be secured in the opening 10, and a large electric device or the like can be installed or replaced. In the case where the effective height L of the opening 10 is constant, when the lower end portion 13 is a straight line continuous at the lower ends of the side edges 11, the lower end portion 13 is a semicircular arc or the lower end portion 13 is a semi-circular shape. Compared to the case of an elliptical arc or the like, the extension of both sides 11 formed in a straight line or the like becomes longer. Therefore, a large opening area can be secured in the opening 10, and a large electric device or the like can be installed or replaced.

  By providing the reinforcing member 9 from both sides 11 of the opening 10, the cross-sectional performance in the direction perpendicular to the tube axis is improved, and the static load applied to the metal tube column 1 due to the weight of the tube body 4 and the crown 5 is increased. It is possible to ensure the rigidity required to compete. When the reinforcing member 9 is provided, the side wall 8 is bent and processed so that the reinforcing member 9 and the side wall 8 are integrated, so that high rigidity can be ensured.

  When the reinforcing member 9 is provided, the side wall 8 can be bent and processed as shown in FIG. 6 so that the existing side wall 8 before processing can be used and easily provided without any other material. it can. As shown in FIG. 3, the reinforcing member 9 is a welded metal plate, or a thick weld that fills a gap formed by the inner wall 14 of the metal tube column 1 and the reinforcing member 9 such as a metal plate. Further, by using a piece of additional reinforcing metal, wood, resin or the like, it is possible to improve the workability of attaching the reinforcing member 9.

  Since the reinforcing member 9 is provided in a convex shape only on the inner side from the both sides 11 of the opening 10 toward the hollow portion 7, and the reinforcing member 9 does not protrude outside the metal tube column 1, the reinforcing member 9 is the metal tube column. There is no possibility of coming into contact with vehicles or pedestrians that pass near 1.

  By providing the reinforcing member 9 perpendicular to the flat surface 15 having both sides 11 on the same plane, the tube axis is perpendicular to the case where the reinforcing member 9 is inclined toward the inner wall 14 so as to be close to the inner wall 14. High cross-sectional performance in the direction can be ensured. When the reinforcing member 9 is inclined to the flat surface 15 side, a higher cross-sectional performance in the vertical direction of the tube axis can be ensured, but the reinforcing member 9 inclined to the flat surface 15 side becomes an obstacle, and the opening 10 The effective opening area is reduced. When the reinforcing member 9 is inclined toward the inner wall 14 and close to the inner wall 14, the inner wall 14 and the reinforcing member 9 of the metal tube column 1 are compared with the case where the reinforcing member 9 is provided perpendicular to the flat surface 15. Since the gap formed by is reduced, a large effective volume of the hollow portion 7 can be secured.

  By providing the reinforcing member 9 so as not to extend to the upper end point 16 and the lower end point 17 of the both sides 11, stress is applied to the reinforcing member 9 from the upper end point 16 or the lower end point 17 where stress is easily concentrated due to a difference in curvature. Can be avoided. By providing the reinforcing member 9 continuously without interruption around the center in the tube axis direction of the both sides 11, compared with the case where the reinforcing member 9 is provided intermittently, to counter the static load by the reinforcing member 9 High rigidity can be ensured. Even in the case of eccentricity from the axial direction of the static load applied to the metal pipe column 1, the extension, depth and position of the reinforcing member 9 provided from each side 18 are appropriately changed and adjusted. Can do. Further, the extension, depth, and position of the reinforcing member 9 can be set so that an electric device or the like can be attached to the reinforcing member 9. When the reinforcing member 9 is provided from all of the side edges 11 from the upper end point 16 to the lower end point 17, it is more resistant to static load than the case where the reinforcing member 9 is provided from a part of the side edges 11. The rigidity for doing so can be improved.

  In general, when bending or welding a curved portion, a higher technique is required than when bending or welding a linear portion. In the present invention, the reinforcing member 9 is provided only from the straight portions on both sides 11, and the reinforcing member 9 does not have to be provided on the curved portions of the upper end portion 12 and the lower end portion 13. It is not always necessary. When the reinforcing member 9 is processed only in the linear portion, the processing becomes easy and the cost required for the processing is low. Since the reinforcing member 9 is provided only on the both sides 11, the amount of steel material used as the reinforcing member 9 can be reduced as compared with the case where the reinforcing member 9 is provided also at the upper end portion 12 and the lower end portion 13. It is possible to improve economy.

  In the present invention, as shown in FIGS. 9 and 10, even when the reinforcing member 9 is provided from both sides 11 that are curved, the curvature of both sides 11 is smaller than the curvature of the upper end 12 and the lower end 13. . Therefore, when the reinforcing member 9 is provided only from the both sides 11, processing is easier and the cost required for processing is lower than when the reinforcing member 9 is provided only from the upper end 12 and the lower end 13 having a large curvature.

  A lid 20 is normally attached to the opening 10 of the metal tube column 1 to protect the inside of the metal tube column 1. The lid 20 is removed when installing, inspecting, or replacing an electrical device or the like in the hollow portion 7 of the metal tube column 1, and the hollow portion 7 of the metal tube column 1 is exposed in the opening 10. When the lid 20 is removed during rainy weather, raindrops flowing on the outer surface of the metal tube column 1 may enter the hollow portion 7 of the metal tube column 1 through the opening 10. In this invention, as shown in FIG. 11, the convex part 19 toward the outer side of the side wall 8 can be provided in the pipe-axis direction upper direction of the opening part 10 in the outer peripheral surface 8a. Thereby, the flow direction of raindrops can be deviated from the opening 10, and raindrops can be prevented from entering the hollow part 7 of the metal tube column 1 through the opening 10.

DESCRIPTION OF SYMBOLS 1 Metal pipe pillar 2 Base 3 Ground 4 Tube 5 Head top part 6 Illumination equipment 7 Hollow part 8 Side wall 8a Outer peripheral surface 9 Reinforcement member 10 Opening part 11 Both sides 12 of an opening part Upper end part 13 of an opening part Lower end part 14 of an opening part Inner wall 15 Flat surface 16 of opening part Upper end point 17 Lower end point 18 Side part 19 of opening part Convex part 20 Lid 21 Bolt

Claims (4)

In a metal tube column comprising a metal tube body and an opening formed in the outer peripheral surface thereof,
An opening having both sides extending substantially linearly toward the tube axis direction and an upper end curved upward in the tube axis direction so as to be continuous from both sides;
A reinforcing member provided in a convex shape only on the inner side toward the inside of the metal tube main body from a part or all of both sides of the opening,
The upper end, the curvature in the vicinity of the portion contiguous with substantially straight above both sides is rather smaller than the curvature of the arc of diameter equal to the spacing of the both sides,
The metal tube pillar according to claim 1, wherein the reinforcing member is provided so as to protrude along only the both sides without being provided at the upper end portion . The opening is to have a lower end which is curved in the axial direction of the tube downwards so as to continue from the both sides,
2. The metal tube pillar according to claim 1, wherein the reinforcing member is provided not to be provided at the lower end portion but to protrude along only the both sides . In a metal tube column comprising a metal tube body and an opening formed in the outer peripheral surface thereof,
An opening having both sides bent outward in the vertical direction of the tube axis, an upper end curved upward in the tube axis so as to be continuous from both sides, and a lower end bent downward in the tube axis;
From all parts of both sides of the opening, and a reinforcing member provided only on the inner side in a convex shape toward the interior of the metal tube body,
The upper end portion and the lower end portion have a curvature in the vicinity of a portion that is continuous with the both sides on which the reinforcing member is provided is smaller than a curvature of an arc having a diameter equal to the interval between the both sides in the continuous portion, the curvature of the upper portion and the lower end portion, Ri of curvature than the size der of the both sides,
The said reinforcing member is provided in the said upper end part and the said lower end part, and it protrudes and is provided along only the said both sides, The metal pipe pillar characterized by the above-mentioned . The convex part provided in convex shape toward the outer side of the said outer peripheral surface is provided in the pipe-axis direction upper direction of the said opening part in the outer peripheral surface of a metal pipe main body. The metal pipe pillar as described in a term.

Images