JP2019024277A - Column reinforcement structure and construction method of the same - Google Patents

Abstract

To achieve a column reinforcement structure which can be constructed with good workability and has high reinforcing strength and a construction method of the column reinforcement structure.SOLUTION: A column reinforcement structure 100 can be constructed with good workability by fastening a pair of reinforcement metal fittings 10 arranged so as to lean against a column P in a direction where abutting plate parts 12 are made to abut on the column P with fastening members 20. Since the column reinforcement structure 100 has a double structure by the abutting plate parts 12 abutting on a peripheral face of the column P and rectangular plate parts 11 installed in positions away from the column P, the structure has higher reinforcement strength. Especially, spaces R having polygonal shapes in a cross sectional view (pentagonal shape in cross sectional view) are formed between the abutting plate parts 12 and the rectangular plate parts 11 and therefore the double structure by the abutting plate parts 12 and the rectangular plate parts 11 becomes a stable three-dimensional structure. Thus, the column P can sufficiently be reinforced by the column reinforcement structure 100.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a column reinforcing structure that reinforces existing columns such as electrified columns and signal columns, and a method for constructing the column reinforcing structure.

Conventionally, in order to increase the strength of existing electrification poles and signal poles, pillars may be rebuilt, but rebuilding the pillars will increase the work period and cost, so it is desirable to reinforce the pillars without rebuilding them. ing.
For example, regarding column reinforcement, there is known a column reinforcement structure in which two semi-cylindrical reinforcement fittings are fixed to the circumferential surface of a steel tube column having a substantially circular cross section and the steel tube column is reinforced (for example, Patent Document 1). reference.).
Since this column reinforcement structure can be constructed manually without using heavy machinery, it is suitable for reinforcing steel pipe columns that are erected in places where it is difficult to carry in heavy machinery.

JP 2006-291535 A

However, in the case of the column reinforcing structure of the above-mentioned Patent Document 1, it can be said that the reinforcing strength simply depends on the strength of the metal plate because it has a single layer structure in which the peripheral surface of the steel pipe column is covered with a metal plate.
Therefore, the present inventors have studied to realize a column reinforcing structure having workability that can be constructed by manual work and having higher reinforcing strength.

  An object of the present invention is to provide a column reinforcement structure that can be constructed with good workability and has higher reinforcement strength, and a method for constructing the column reinforcement structure.

In order to achieve the above object, one invention according to the present application is
A column reinforcing structure in which a column with a substantially circular cross section is reinforced with a pair of reinforcing brackets,
The reinforcing bracket is
A long long plate portion arranged along the pillar at a position away from the pillar;
Abutting plate portions fixed on both sides of the long plate portion in the width direction and abutting against the pillars;
With
The contact plate part is fixed so as to form a space between the long plate part,
The pair of reinforcing metal fittings are fastened so as to sandwich the column.

With such a column reinforcing structure, the pair of reinforcing brackets are installed in such a manner that the reinforcing bracket is set up against the column in such a direction that the abutting plate is in contact with the column, and the column is sandwiched between the pair of reinforcing brackets. It can be constructed with good workability by fastening to the pillar.
In addition, this column reinforcing structure has a double structure with a contact plate portion and a long plate portion because a space is formed between the contact plate portion and the long plate portion. Since the column reinforcing structure has a higher reinforcing strength than a single-layered column reinforcing structure, the column can be reinforced with this column reinforcing structure.

Also, preferably
A space formed between the abutting plate portion and the long plate portion has a polygonal shape in a sectional view.
By doing so, the double structure of the contact plate portion and the long plate portion becomes a stable three-dimensional structure, and thus the column can be reinforced favorably by this column reinforcement structure.

Also, preferably
A fastening member that spans the contact plate portion of the pair of reinforcing metal fittings facing each other across the column, and that tightens the pair of reinforcing metal fittings toward the column;
Both ends of the fastening member are configured to be accommodated in the space.
For example, when the fastening member protrudes from the outer peripheral surface of the reinforcing metal fitting, not only the beauty of the column reinforcing structure is impaired, but an operator may come into contact with the protruding portion.
Therefore, if both ends of the fastening member are accommodated in the space so that the fastening member does not protrude from the outer peripheral surface of the reinforcing metal fitting, it is possible to prevent troubles that an operator contacts the fastening member, and a column reinforcement structure Aesthetics can be improved.

Also, preferably
A suspension fitting having a pair of hook portions and disposed at a predetermined position of the pillar;
A suspension provided at the upper end of the reinforcing metal fitting,
The pair of reinforcing metal fittings are fastened in a state in which the hanging part is hung on the hook part of the hanging metal fitting arranged on the column.
Thus, if it is a column reinforcement structure by which a pair of reinforcement metal fittings are fastened in a state where the reinforcement metal fittings are suspended from the suspension metal fittings arranged on the columns, it can be constructed with good workability.

Also, other inventions related to this application are:
A method for constructing the above column reinforcing structure,
Disposing the hanging bracket at a predetermined position of the pillar;
A step of hanging the hanging portion on the hook portion of the hanging fitting and installing the pair of reinforcing fittings to be suspended from the pillar;
Tightening and fastening the pair of reinforcing brackets toward the pillar;
I was prepared to.

In this way, if the hanging part is hung on the hook part of the hanging metal fitting previously arranged on the pillar and the reinforcing metal fitting is hung on the pillar, the reinforcing metal fitting is prevented from falling down. Thus, without supporting the reinforcing bracket, the pair of reinforcing brackets can be easily fastened with the fastening member, and a column reinforcing structure in which the column is sandwiched between the pair of reinforcing brackets can be constructed with good workability.
Further, the column reinforcing structure thus constructed has a double structure in which a space is formed between the abutting plate portion and the long plate portion. Since the reinforcing strength is higher than that of the reinforcing structure, the pillar can be favorably reinforced by this column reinforcing structure.

  ADVANTAGE OF THE INVENTION According to this invention, the column reinforcement structure which can be constructed | assembled with sufficient workability and has higher reinforcement strength is obtained.

It is the front view (a) which shows the column reinforcement structure of this embodiment, and its side view (b). It is sectional drawing which shows the column reinforcement structure of this embodiment. It is the front view (a) which shows the reinforcement metal fitting of this embodiment, and its sectional drawing (b). It is sectional drawing (a) (b) which shows the modification of a column reinforcement structure. It is a front view which shows the modification of a reinforcement metal fitting. It is a front view which shows the reinforcement metal fitting of Embodiment 2. FIG. They are a top view (a) which shows a hanging metal fitting, a side view (b), and a front view (c). It is the front view (a) which shows the column reinforcement structure of Embodiment 2, and its side view (b).

Hereinafter, embodiments of a column reinforcing structure and a method for constructing a column reinforcing structure according to the present invention will be described in detail with reference to the drawings. However, the embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.
The column reinforcing structure of the present embodiment is obtained by reinforcing existing concrete columns such as electrified columns and signal columns using a pair of reinforcing metal fittings.

(Embodiment 1)
FIG. 1A is a front view of a column reinforcing structure 100 in which a column P having a substantially circular cross section such as an electric column or a signal column is reinforced using a pair of reinforcing metal fittings 10, and FIG. FIG. 2 is a cross-sectional view of the column reinforcing structure 100.
3A is a front view showing the reinforcing metal fitting 10, and FIG. 3B is a cross-sectional view of the reinforcing metal fitting 10. As shown in FIG.
Note that the column P here has a taper that tapers toward the upper end.

As shown in FIGS. 1 (a), 1 (b), 2, 3 (a) and 3 (b), the reinforcing metal fitting 10 is a long long plate disposed along the column P at a position away from the column P. And a contact plate portion 12 that is fixed to both sides of the long plate portion 11 in the width direction and is in contact with the column P.
The long plate portion 11 is a member formed by bending a long metal plate, and has four folds along the longitudinal direction so as to exhibit a substantially bracket shape (for example, a shape like “[”) in a cross-sectional view. Is formed.
The abutting plate portion 12 is a member formed by bending a long metal plate having a narrower width than the long plate portion 11, and two folds along the longitudinal direction are formed so as to exhibit a substantially bracket shape in cross section. Is formed.
The long plate portion 11 and the contact plate portion 12 are formed using a metal plate such as SS400 (rolled steel for general structure) having a thickness of 3.2 mm, for example.

Then, one end of the contact plate 12 is fixed by welding to both ends of the long plate 11 in the width direction, and the other end of the contact plate 12 is attached to the inner wall surface of the long plate 11. It is fixed by welding.
In this embodiment, the contact plate portion 12 is fixed to the long plate portion 11 by YAG laser welding.
In particular, the long plate portion 11 and the contact plate portion 12 are fixed with the concave inner surfaces facing each other, so that the contact plate portion 12 forms a space R between the long plate portion 11 and the long plate portion 11. It is fixed.
Here, a space R having a pentagonal shape in cross section is formed between the contact plate portion 12 and the long plate portion 11.

Further, the contact plate portion 12 is formed with a plurality of small holes 12a through which the bolts 21 are passed, and the long plate portion 11 has a plurality of small holes 12a at positions corresponding to the small holes 12a of the contact plate portion 12. An opening 11a is formed.
In the present embodiment, 11 small holes 12 a are formed in the abutting plate portion 12 and 11 openings 11 a are formed in the long plate portion 11 along the longitudinal direction of the reinforcing metal fitting 10.

The reinforcing metal fitting 10 is formed in a direction shown in FIG. 3A, for example, a length of 300 cm, an upper end width of 27 cm, and a lower end width of 30 cm.
In this way, the reinforcing metal fitting 10 is formed in a tapered shape corresponding to the tapered shape of the column P that tapers toward the upper end.
Moreover, since the weight of the reinforcing metal fitting 10 of this size is about 40 kg, it can be carried by two workers.

In order to attach the reinforcing bracket 10 to the column P, the reinforcing bracket 10 is leaned against the column P in a direction in which the contact plate portion 12 is in contact with the column P, and the column P is sandwiched between the pair of reinforcing brackets 10. Then, a bolt 21 is passed through the small hole 12a of the contact plate portion 12 so as to span the contact plate portion 12 of the pair of reinforcing metal fittings 10, and a nut 22 is screwed to the bolt 21.
Specifically, the bolt 21 is passed through the small hole 12a of the abutting plate 12 through the opening 11a of one reinforcing bracket 10, and the bolt 21 protruding from the small hole 12a of the abutting plate 12 of the other reinforcing bracket 10. A nut 22 is screwed through the opening 11a.

Then, by tightening the nut 22 into the bolt 21, the pair of reinforcing metal fittings 10 can be tightened toward the column P.
Thus, the bolt 21 and the nut 22 have a function of tightening the pair of reinforcing metal fittings 10 toward the column P. In the present embodiment, the fastening member 20 that fastens the pair of reinforcing metal fittings 10 toward the column P is constituted by a bolt 21 and a nut 22.

The reinforcing metal fitting 10 is formed in a tapered shape corresponding to the tapered shape of the pillar P, and the contact plate portion 12 of the reinforcing metal fitting 10 is in line contact with the pillar P.
If the contact plate portions 12 of the pair of reinforcing metal fittings 10 are configured to make line contact along the longitudinal direction of the column P, by adjusting the tightening amount of the nut 22 screwed to the bolt 21, The pillar P can be suitably clamped by the pair of reinforcing metal fittings 10.
Specifically, the tightening amount is increased so that the nut 22 is tightened in the depth of the bolt 21 in the thin portion of the column P, and the tightening amount of the nut 22 to the bolt 21 is decreased in the thick portion of the column P. By adjusting so that the pair of reinforcing brackets 10 (contact plate portions 12) are in line contact with the columns P along the longitudinal direction of the columns P, the columns P are suitably held by the pair of reinforcing brackets 10. be able to.
For example, in the case of a reinforcing bracket formed so as to be in surface contact with the circumferential surface of a column like a conventional reinforcing bracket, if the curvature of the circumferential surface of the column and the curvature of the inner surface of the reinforcing bracket do not match, The holding of the pillar by the pair of reinforcing metal fittings becomes unstable.
On the other hand, if the contact plate portion 12 of the reinforcing metal fitting 10 is configured to be in line contact with the pillar P as in this embodiment, the tightening amount of the nut 22 screwed to the bolt 21 is adjusted. By doing so, the pillar P can be suitably sandwiched by the pair of reinforcing metal fittings 10, and thus the pillar P can be suitably reinforced by the pair of reinforcing metal fittings 10.

Note that both ends of the fastening member 20 (the bolt 21 and the nut 22) are accommodated in the space R between the contact plate portion 12 and the long plate portion 11 so as not to protrude from the outer peripheral surface of the reinforcing metal fitting 10.
When the fastening member 20 (the bolt 21 and the nut 22) protrudes from the outer peripheral surface of the reinforcing metal fitting 10, not only does the appearance of the column reinforcing structure 100 be impaired, but an operator may come into contact with the protruding portion. Therefore, it is preferable that both ends of the fastening member 20 are accommodated in the space R between the contact plate portion 12 and the long plate portion 11.

Thus, the column reinforcing structure 100 can be constructed by attaching the pair of reinforcing metal fittings 10 to the pillars P by the fastening members 20 and fastening the pair of reinforcing metal fittings 10 so as to sandwich the pillars P therebetween.
In this embodiment, as shown in FIGS. 1 (a) and 1 (b), the ground G around the base of the pillar P is dug about 30 cm, and the pair of reinforcing metal fittings 10 are fastened to the pillar P and attached. The lower part of the column reinforcement structure 100 is constructed in a state of being buried in the ground.
In addition, since the lower part of the pillar P is embedded, for example to about 200 cm in the ground, and a root rod etc. are provided in the lower part of the pillar P, when attaching a pair of reinforcement brackets 10 to the pillar P, the pillar There is no problem in digging about 30 cm of the ground G around the base of P.

  Thus, the column reinforcing structure 100 of the present embodiment can be constructed with good workability by fastening the pair of reinforcing metal fittings 10 installed so as to lean against the column P with the fastening member 20. In particular, since the reinforcing bracket 10 can be carried by two workers, the column reinforcing structure 100 can be constructed by attaching the reinforcing bracket 10 to the column P without using heavy machinery or the like.

As shown in FIG. 2, this column reinforcing structure 100 has a double structure composed of a contact plate portion 12 that contacts the peripheral surface of the column P and a long plate portion 11 disposed at a position away from the column P. Therefore, the reinforcing strength is higher than that of the single-layered column reinforcing structure as in the prior art.
In particular, a space R having a polygonal shape in cross section (here, a pentagonal shape in cross section) is formed between the contact plate portion 12 and the long plate portion 11, so that the contact plate portion 12 and the long plate portion 11 are formed. Since the double structure formed by the above becomes a stable three-dimensional structure, the pillar P can be favorably reinforced by the pillar reinforcing structure 100.

  As described above, the column reinforcing structure 100 formed by fastening the pair of reinforcing metal fittings 10 with the fastening member 20 can be constructed with good workability, and has a stable three-dimensional structure composed of the contact plate portion 12 and the long plate portion 11. Therefore, the pillar P can be favorably reinforced by the pillar reinforcing structure 100.

The present invention is not limited to the above embodiment.
For example, as shown in FIG. 4 (a), a space R having a triangular shape in cross section may be formed between the contact plate portion 12 and the long plate portion 11, and FIG. As shown, a space R having a square shape in cross section may be formed between the contact plate portion 12 and the long plate portion 11.
Even in such a column reinforcing structure 100, the column P is favorably reinforced because it has a high reinforcing strength due to the stable three-dimensional double structure of the contact plate portion 12 and the long plate portion 11. be able to.

Moreover, as shown in FIG. 5, the reinforcing metal fitting 10 with the same dimension may be sufficient as the width | variety of an upper end part and the width | variety of a lower end part.
The reinforcing metal fitting 10 shown in FIG. 5 has a length of 300 cm, an upper end width of 30 cm, and a lower end width of 30 cm, for example.
The reinforcing metal fitting 10 is formed to correspond to a columnar column P having the same diameter on the upper end side and the lower end side.
And the column reinforcement structure 100 can be constructed | assembled with sufficient workability by leaning the reinforcement metal fitting 10 on the columnar pillar P, and fastening with the fastening member 20 in the state which pinched | interposed the pillar P with the pair of reinforcement metal fittings 10. FIG.

Note that, as shown in FIG. 5, the column P having a taper that tapers toward the upper end can be reinforced by the reinforcing metal fitting 10 having the same width at the upper end and the lower end.
In this case, on the upper end side where the diameter of the column P is thin, the tightening amount is increased so that the nut 22 is tightened in the back of the bolt 21, and on the lower end side where the diameter of the column P is thick, the nut 22 is tightened on the bolt 21. A column reinforcing structure in which a pair of reinforcing metal fittings 10 are brought into line contact with the pillars P along the longitudinal direction of the pillar P by adjusting so as to reduce the amount of insertion, and the pillars P are suitably sandwiched by the pair of reinforcing metal fittings 10 100 can be built.

(Embodiment 2)
Next, Embodiment 2 of the column reinforcement structure and the method for constructing the column reinforcement structure according to the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described.

As shown in FIG. 6, a suspension portion 13 is provided at the upper end portion of the reinforcing metal fitting 10.
The hanging portion 13 is a metal member having a substantially inverted U shape, and is fixed to the upper outer surface of the long plate portion 11 by welding.
When attaching the reinforcing metal fitting 10 provided with the hanging portion 13 to the column P, the hanging metal fitting 30 (see FIGS. 7A, 7B, and 7C) is used.

The hanging metal fitting 30 has a pair of hook portions 32 as shown in FIGS.
Specifically, the hanging metal fitting 30 includes a pair of fixing metal fittings 31 connected by bolts B and nuts N, and a hook portion 32 fixed to the outer surface of each fixing metal fitting 31.

The fixing bracket 31 is a member having a substantially semi-cylindrical shape, and the inner diameter thereof is formed to be approximately the same size as the diameter of the upper end side of the column P. Specifically, when the reinforcing bracket 10 is leaned against the pillar P, the fixing bracket 31 is formed corresponding to the diameter of the pillar P around the upper end of the reinforcing bracket 10 (for example, 270 cm to 300 cm from the ground). Yes.
The hook portion 32 is a metal member that is fixed to the approximate center of the outer surface of the fixture 31 by welding.

When attaching the reinforcing metal fitting 10 of the second embodiment to the pillar P, first, the hanging metal fitting 30 is attached to a predetermined position of the pillar P (for example, a position where the upper end of the reinforcing metal fitting 10 hits when the reinforcing metal fitting 10 is leaned against the pillar P). Fasten with bolts B and nuts N.
Next, the hanging portion 13 of the reinforcing bracket 10 is hung on the hook portion 32 of the hanging bracket 30 disposed at a predetermined position of the column, and the pair of reinforcing brackets 10 are installed so as to be suspended along the column P.
At this time, the ground G around the base of the pillar P is dug about 30 cm.

Next, the pair of reinforcing metal fittings 10 in a state in which the hanging portion 13 is hung on the hook portion 32 of the hanging metal fitting 30 disposed on the column P is attached to the column P by the fastening members 20 (bolts 21 and nuts 22). The column reinforcing structure 100 can be constructed by tightening and fastening the reinforcing bracket 10 toward the column P.
The ground G is backfilled after the pair of reinforcing metal fittings 10 are fastened to the pillars P by the fastening members 20.

  Thus, if the hanging part 13 is hung on the hook part 32 of the hanging metal fitting 30 previously arranged on the pillar P and the reinforcing metal fitting 10 is hung on the pillar P, the reinforcing metal fitting 10 will not fall down. Therefore, without supporting the reinforcing bracket 10 by a plurality of workers, the pair of reinforcing brackets 10 can be easily fastened by the fastening member 20, and the column reinforcing structure 100 in which the column P is sandwiched between the pair of reinforcing brackets 10 is provided. It can be built with good workability.

  In addition, after the pillar reinforcement structure 100 is constructed, the suspension fitting 30 may be removed from the pillar P even with the suspension fitting 30 attached to the pillar P.

  In the above embodiment, the fastening member 20 constituted by the bolt 21 and the nut 22 is used. However, the present invention is not limited to this, and the fastening member is formed around the pair of reinforcing brackets 10. It may be a band-shaped metal fitting or a band-shaped band member that is wound around a surface and fixed so that the pair of reinforcing metal fittings 10 are fastened to the pillar P.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

DESCRIPTION OF SYMBOLS 10 Reinforcing bracket 11 Long plate portion 11a Opening 12 Contact plate portion 12a Small hole 13 Hanging portion 20 Fastening member 21 Bolt 22 Nut 30 Hanging bracket 31 Fixing bracket 32 Hook portion 100 Column reinforcement structure P Column R Space G Ground B Bolt N Nut

Claims (5)

A column reinforcing structure in which a column with a substantially circular cross section is reinforced with a pair of reinforcing brackets,
The reinforcing bracket is
A long long plate portion arranged along the pillar at a position away from the pillar;
Abutting plate portions fixed on both sides of the long plate portion in the width direction and abutting against the pillars;
With
The contact plate part is fixed so as to form a space between the long plate part,
The column reinforcing structure, wherein the pair of reinforcing metal fittings are fastened so as to sandwich the column.   The column reinforcing structure according to claim 1, wherein a space formed between the contact plate portion and the long plate portion has a polygonal shape in a sectional view. A fastening member that spans the contact plate portion of the pair of reinforcing metal fittings facing each other across the column, and that tightens the pair of reinforcing metal fittings toward the column;
The column reinforcing structure according to claim 1, wherein both ends of the fastening member are configured to be accommodated in the space. A suspension fitting having a pair of hook portions and disposed at a predetermined position of the pillar;
A suspension provided at the upper end of the reinforcing metal fitting,
The pair of reinforcing metal fittings are fastened in a state where the hanging portion is hung on a hook portion of the hanging metal fitting disposed on the column. The column reinforcement structure described. A method for constructing a column reinforcing structure according to claim 4,
Disposing the hanging bracket at a predetermined position of the pillar;
A step of hanging the hanging portion on the hook portion of the hanging fitting and installing the pair of reinforcing fittings to be suspended from the pillar;
Tightening and fastening the pair of reinforcing brackets toward the pillar;
A method for constructing a column reinforcement structure characterized by comprising:

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