JP2006063742A - Strut reinforcement structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strut reinforcement structure for reinforcing a lower part of the strut and preventing collapse of the strut because of a damage like metal fatigue or corrosion. <P>SOLUTION: The strut reinforcement structure for reinforcing the lower part of the strut 1 constructed on the ground comprises a base plate 2 fixed to the lower part of the strut 1 by means of welding and plate-shaped reinforcing plates 4 arranged on an inner surface of the lower part of the strut 1 and extended in the same vertical direction as the strut. A plurality of the reinforcing plates 4 are arranged on the inner surface in the circumferential direction with their upper end sides 4a fixed to the inner surface of the strut by means of welding and with their lower end sides 4b fixed to the inner surface of the strut or to the base plate 2 by means of welding. The reinforcing plates 4 are preferably formed of a flat steel. A clearance is preferably formed between each of the reinforcing plates 4 and the inner surface of the strut except the part to be welded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a strut reinforcing structure for reinforcing a lower portion of a strut installed on the ground.

  A structure as shown in FIG. 4 is known as a general support structure for fixing a ground installation column such as a street light, an illumination light, a road sign, and a flag pole to the ground. As shown in FIG. 4, the support column 1 is formed in a hollow pipe shape extending in the vertical direction, and a flat base plate 2 (corresponding to a support base) is provided at the lowermost end of the support column 1. Are joined and fixed by the welded part A. In addition, triangular plate-like rib plates 3 are arranged at a plurality of locations (for example, four locations) along the circumferential direction at the lower end portion of the support column 1. Are fixed. The base plate 2 is fixed in the ground by anchor bolts.

  In this way, the column 1 is fixed by the base plate 2 fixed by the anchor bolt and the cantilever support structure. Therefore, when an external force such as wind and rain is repeatedly applied to the support 1, there is a risk that the lower part (ground part) of the support will be damaged and collapsed due to metal fatigue or corrosion. As a method for solving such a problem, the following strut reinforcement structure is considered.

  That is, a structure is known in which the lower part of the support is made to have a double-pipe structure to reinforce the lower part of the support. The reinforcing pipe for reinforcement includes a structure that is in close contact with the outer surface of the column and a structure that is in close contact with the inner surface of the column. In either case, the dimensional accuracy of the reinforcing pipe is required for the close contact, and machining such as lathe processing is required, resulting in a cost increase. In addition, when the double pipe structure is used, the cross section changes rapidly at the upper end of the reinforcing pipe, which is a structural weak point. For example, when an automobile or the like collides with a support column, the support column is sheared and collapsed at the upper end portion, causing a secondary disaster. That is, the sudden cross-sectional change becomes a stress concentration part, and the part is cracked by metal fatigue or corrosion and collapses.

  On the other hand, a steel pipe column base structure disclosed in Patent Document 1 below is known (see FIG. 5). In this structure, the inner tube 10 is included in the lower inner surface of the column 1 (steel pipe column). The inner surface of the support column and the inner insertion tube 10 are not in close contact with each other and are arranged with a gap between them, and the bolts 11 (one to two) inserted from the lower outer surface of the support column 1 are screwed together. The intubation 10 is configured to be held. The bolt 11 is configured to be screwed at a predetermined height position in the lower part of the support column. When a plurality of bolts 11 are used, the plurality of bolts 11 are arranged along the circumferential direction. . There is also a description that the inner intubation 10 may be simply included.

However, it is considered difficult to achieve sufficient reinforcement by simply holding the intubation tube 10 with the bolt 11. For example, when the support column 1 is about to collapse due to metal fatigue or corrosion, a gap is formed between the upper end of the intubation tube 10 and the inner surface of the support column, and the intubation tube 10 cannot support the support column 1, 1 may cause a sudden collapse. Such sudden collapse can cause secondary disasters and must be reliably prevented. Moreover, when the support | pillar 1 vibrates, the upper end part of the intubation tube 10 and the support | pillar inner surface contact repeatedly, and this may advance damage.
JP 2000-61419 A

  The present invention has been made in view of the above circumstances, and the problem is to provide a support structure that reinforces the lower part of the support and can prevent the support from collapsing due to damage such as metal fatigue or corrosion. is there.

In order to solve the above problems, the strut reinforcing structure according to the present invention is:
In the strut reinforcement structure to reinforce the lower part of the strut installed on the ground,
A support base welded and fixed to the lower part of the column;
A plate-shaped reinforcing member disposed on the lower inner surface of the support and extending in the same vertical direction as the support,
A plurality of the reinforcing members are arranged along the circumferential direction on the inner surface, and the upper end side thereof is welded and fixed to the inner surface of the column, and the lower end side thereof is fixed to the inner surface of the column or the support base by welding. is there.

  The operation and effect of the strut reinforcing structure having such a configuration will be described. A support base is fixed to the lower part of the column by welding. A plate-like reinforcing member extending in the vertical direction is disposed on the lower inner surface of the column, and the upper end side is welded and fixed to the column inner surface, and the lower end side is fixed to the column inner surface or the support base by welding. As described above, since the upper and lower ends are fixed, the dimensional accuracy is not required unlike the double tube structure. In addition, since the upper and lower ends are welded and fixed at two locations, the upper and lower ends of the reinforcing member can be supported even when the support is about to collapse due to damage. As a result, it is possible to provide a support structure that reinforces the lower part of the support and can prevent the support from collapsing due to damage such as metal fatigue or corrosion.

  In the present invention, the plate-like reinforcing member is preferably formed of flat steel. The flat steel can secure the strength of the reinforcing member itself, and can more effectively prevent the column from collapsing.

  In the present invention, it is preferable that a gap is formed between the plate-like reinforcing member and the inner surface of the support column, except for a portion to be welded. By forming the gap, it is possible to obtain a reinforcing effect by the reinforcing member and to ensure flexibility. That is, it does not immediately collapse when attempting to collapse, but can maintain the posture in which the column is inclined by deformation by the reinforcing member. By this inclined state, it can be clearly recognized from the outside that the column is damaged.

  A preferred embodiment of a strut reinforcing structure according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a street lamp as an example of a support column. The support | pillar 1 is extended in the up-down direction, and the electric lamp 1a is attached to the front-end | tip part. Moreover, the long hole 1b extended in an up-down direction is formed in the position where a person can operate, and a control unit is attached. The structure which reinforces the lower part (base part) of the support | pillar 1 is provided, and the detail is shown by FIG. In FIG. L indicates the ground (or road surface).

  Next, the strut reinforcement structure will be described in detail with reference to FIG. (A) is a longitudinal cross-sectional view, (b) is a cross-sectional view. The support column 1 is a hollow steel pipe having a shape extending in the vertical direction. A base plate 2 (corresponding to a support base) is provided at the lowermost end of the column 1. The base plate 2 is formed in the shape of a circular plate plate in plan view. However, the shape of the base plate 2 can be variously modified and is not limited to this. A rib plate 3 is attached to the lower part of the column 1 for reinforcement. As shown in FIG. 2 (b), the rib plate 3 is attached around the support column 1 at four equal intervals. Various modifications of the shape of the rib plate 3 are possible. For the base plate 2 and the rib plate 3, for example, the same material as that of the support column 1 is used. The rib plate 3 is fixed to the support column 1 and the base plate 2 by welding. Welding is performed at all corners where the rib plate 3 contacts the support column 1 and the base plate 2. The base plate 2 is formed with four through holes 2a, and attachment using anchor bolts is performed using the through holes 2a.

  A reinforcing plate 4 (see FIG. 2) for reinforcing the lower portion of the column is attached to the inner surface of the lower portion of the column 1. The reinforcing plate 4 is preferably formed of flat steel, and thereby sufficient strength can be ensured. The reinforcing plate 4 has a shape extending along the vertical direction, and its upper end 4a is fixed by welding to the inner surface of the support column. Further, the lower end 4 b of the reinforcing plate 4 is fixed by welding to the end surface 2 c of the hole 2 b formed in the center of the base plate 2. The lower end 4b of the reinforcing plate 4 may be welded to the lowermost end of the support column 1, but it is more effective in terms of reinforcement to be fixed to the base plate 2. The reinforcing plate 4 is integrally formed with bent portions 4c and 4d at the upper end portion and the lower end portion thereof to facilitate welding, and with the reinforcing plate 4 attached, the inner surface of the support column and the reinforcing plate 4 are attached. (See also the cross-sectional view of FIG. 3). The reinforcing plate 4 is attached to the inner surface of the column at three locations along the circumferential direction at equal intervals. The number of attachments may be other than three. As can be seen from FIG. 2B, the ends of the bent portions 4c and 4d have an arc shape along the inner diameter of the inner surface of the column. This makes it easier to perform the attaching operation of the reinforcing plate 4.

  According to the above configuration, the following effects are exhibited. That is, by fixing the reinforcing plate 4 to the lower part of the support column, the strength of the lower part of the support column can be increased, and the collapse of the support column 1 against damage such as metal fatigue or corrosion is made difficult. Further, when the support column 1 itself is damaged and tries to collapse, it can be prevented from collapsing due to the strength of the reinforcing plate 4. Further, the reinforcing plate 4 can not only simply increase the strength but also give a certain degree of flexibility, and when the support column 1 is damaged and tries to collapse, the support plate 1 is held in an inclined state. It is possible to easily recognize that an abnormality has occurred in the support column 1. That is, even if some kind of damage has occurred in the support column 1, if the appearance of an abnormality in the support column 1 cannot be immediately immediately recognized, an abrupt collapse may occur when it starts to collapse. . Such a sudden collapse may cause a secondary disaster and must be reliably prevented. In the present invention, the support column 1 can be held in an inclined state as described above, and a sudden collapse can be prevented. In addition, the reinforcing plate 4 is attached to the inner surface of the column with a gap, and when external vibration acts on the column 1, the vibration can be absorbed and the durability against metal fatigue is improved. Can be made.

<Another embodiment>
In this embodiment, the reinforcing plate is formed by a plate member (flat steel) having a simple cross-sectional shape (rectangular cross-section), but is not limited to this, and a flat steel having a cross-sectional shape other than a rectangular shape. May be used.

Diagram showing the structure of the street light Diagram showing strut reinforcement structure Expanded sectional view of the bottom of the column The figure which shows the structure of the support | pillar lower part which concerns on a prior art The figure which shows the strut reinforcement structure concerning a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support | pillar 2 Base plate 2a, 2b Hole 2b End surface 3 Rib plate 4 Reinforcement plate 4a Upper end part 4b Lower end part 4c, 4d Bending part

Claims (4)

In the strut reinforcement structure to reinforce the lower part of the strut installed on the ground,
A support base welded and fixed to the lower part of the column;
A plate-shaped reinforcing member disposed on the lower inner surface of the support and extending in the same vertical direction as the support,
A plurality of reinforcing members are arranged along the circumferential direction on the inner surface, and the upper end side thereof is fixed by welding to the inner surface of the supporting column, and the lower end side thereof is fixed by welding to the inner surface of the supporting column or the support base. Construction.   The strut reinforcing structure according to claim 1, wherein the plate-like reinforcing member is made of flat steel.   The strut reinforcing structure according to claim 1, wherein a gap is formed between the plate-shaped reinforcing member and the inner surface of the strut, except for a portion to be welded.   The strut reinforcement structure according to claim 3, wherein a bent portion for forming the gap is integrally formed on an upper end side and a lower end side of the plate-like reinforcing member.

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