JP2005023745A - Reinforcing structure of reinforced concrete column, and reinforcing material for use in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure of a reinforcing concrete column, which enables the binding of enclosing steel plates without welding, and a reinforcing material for use in the same. <P>SOLUTION: In this reinforcing structure of the reinforcing concrete column, a periphery of the reinforced concrete column 1 is enclosed with the enclosing steel plates 2 or 6, and the steel plates 2 or 6 are bound together by winding a plurality of binding members around them. In the steel plate 6, one edge thereof is bent in a cross section along a line orthogonal to its longitudinal direction; by making a bent part serve as a boundary, one side serves as an enclosing piece 7; the other side serves as an adjusting piece 8; and the enclosing piece 7 of either of the steel plates 6 adjacent to each other overlaps the adjusting piece 8 of the other steel plate 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reinforcing structure for reinforcing a reinforced concrete column such as a column of a building structure.

Reinforced concrete columns such as building structures are strongly required to have strong strength such as earthquake resistance. As a means for that purpose, a reinforcing structure shown in FIG. 6 is conventionally known.
This conventional reinforcing structure reinforces a reinforced concrete column 1 having a square cross-sectional shape in a direction perpendicular to the longitudinal direction. That is, a pair of enclosure steel plates 2 and 2 are provided, and the enclosure steel plates 2 and 2 are formed so as to form a square column having a hollow inside by abutting the butted portions 3a and 3b. The square columns made of these enclosure steel plates 2 and 2 are made slightly thicker than the reinforced concrete columns 1.

In order to reinforce the reinforced concrete column 1 using the pair of surrounding steel plates 2 and 2 as described above, the following is performed.
First, the periphery of the reinforced concrete column 1 is surrounded by a pair of surrounding steel plates 2 and 2, and the butted portions 3a and 3b are butted. The butted portions 3a and 3b are welded to bond the surrounding steel plates 2 and 2 together. Reference symbols y and y are welds.

If the enclosure steel plates 2 and 2 are welded and bonded to each other as described above, the square column formed thereby becomes thicker than the reinforced concrete column 1 as described above. Therefore, the enclosure steel plates 2 and 2 and the reinforced concrete column 1 are formed. An interval h is formed between
The gap h formed as described above is filled with an adhesive 4 such as a grout material, and the surrounding steel plates 2 and 2 are brought into close contact with the reinforced concrete column 1 to reinforce the reinforced concrete column 1.

Japanese Examined Patent Publication No. 53-42986 (pages 1 and 2, FIG. 1)

  In the above-described conventional reinforcing structure, the enclosure steel plate 2 is welded at the site where the reinforced concrete pillar 1 is constructed, so that sparks generated during welding work ignite the surrounding combustible material and cause a fire. There was a risk of getting up. For this reason, strict attention is required for the spark, and there is a problem that it takes time and labor for curing the surrounding combustible materials.

In addition, if the technology for welding steel plates is inferior, cracks may be generated from the welded portions, or the steel plates may be deformed by the heat generated by welding, so that the extra reinforcement may not be meaningful. However, whether welding is solid or not depends on the technique of the welder, so a uniform weld finish cannot always be expected. Therefore, if a high-quality weld finish is always sought, a skilled welder must be secured, and there is a problem that a large amount of money is inevitably required.
An object of the present invention is to provide a reinforcing structure for a reinforced concrete column capable of binding an enclosing steel plate without welding and a reinforcing material used therefor.

The first invention is characterized in that a reinforced concrete column is surrounded by a plurality of surrounding steel plates that are reinforcing materials, and the surrounding steel plates are bound by winding a plurality of binding members around them.
The second invention is characterized in that a plurality of surrounding steel plates are overlapped with each other.
3rd invention has the characteristics in the point which provided the space | interval which inject | pours an adhesive material between a reinforced concrete pillar and a surrounding steel plate.
4th invention has the characteristics in the point which comprised the binding member with the strip | belt-shaped continuous fiber sheet.

According to a fifth aspect of the invention, a reinforced concrete column is surrounded by a plurality of surrounding steel plates, and the surrounding steel plates are bent at one edge in a cross section taken along a line perpendicular to the longitudinal direction, and the bent portion is bounded. In addition, one of the surrounding steel plates is used as an enclosure piece and the other is used as an adjustment piece, and the enclosure piece of one enclosure steel plate is superposed on the adjustment piece of the other enclosure steel plate. .
The sixth invention is a bundling member for bundling a plurality of enclosed steel plates surrounding the outer periphery of a reinforced concrete column, and has a right-angle portion corresponding to a right-angle portion of the enclosed steel plate, and standing connection pieces on both sides of the right-angle portion, It is characterized in that the connecting pieces are connected by tie rods.

According to the first to sixth inventions, since the surrounding steel plates are bound by the binding member, it is not necessary to perform the welding work as in the prior art. Since there is no need for welding work, there is no fire caused by sparks generated during welding work. Therefore, it is possible to save time and labor for curing the spark.
Further, since the surrounding steel plate can be bound by the binding member, it does not depend on the technique of the welder as in the conventional case. Therefore, a uniform construction result can always be obtained. And since it is not necessary to ensure a skilled welder like the past, the cost accompanying it can be reduced.

  In particular, according to the fifth aspect, since the enclosed steel plate is L-shaped, the size of the inner side enclosed by the enclosed steel plate can be adjusted. That is, the inside size of the enclosure can be changed by sliding the overlapping portion of the enclosure piece and the adjustment piece of the enclosure steel plates adjacent to each other. Therefore, even if there are some errors in the external dimensions of the reinforced concrete columns, the minimum necessary interval for filling the adhesive can always be ensured accurately. Since the necessary minimum interval can be ensured accurately, there is no problem that the adhesive material must be filled more than necessary or the necessary amount cannot be filled.

  In addition, the fact that the size of the inner side enclosed by the enclosure steel plate can be adjusted to some extent enables mass production of the enclosure steel plate at the factory, and can cope with reinforced concrete columns of various thicknesses on site. In particular, if the length of the adjusting pieces in the overlapping direction is made longer, the length that can be adjusted becomes longer, and the versatility of the surrounding steel plate is also increased.

The first embodiment of the present invention shown in FIG. 1 is characterized in that the surrounding steel plate 2 is bound by a binding member, and the other configuration is the same as the conventional example. That is, the pair of surrounding steel plates 2 and 2 have a U-shaped cross-sectional shape in a direction perpendicular to the longitudinal direction, and the U-shaped end edges serve as butted portions 3a and 3b. A hollow quadrangular column is formed by abutting the butted portions 3 a and 3 b with each other, and the hollow portion of the quadrangular column is made thicker than the reinforced concrete column 1.
As shown in FIG. 1, the periphery of the reinforced concrete column 1 is surrounded by a pair of surrounding steel plates 2 and 2. At this time, an interval h is formed between the reinforced concrete column 1 and the surrounding steel plate 2. This is the same as in the prior art.

When the reinforced concrete column 1 is surrounded by the pair of surrounding steel plates 2 and 2 as described above, the belt-like continuous fiber sheet 5 which is a binding member of the present invention is wound around the surrounding steel plate 2 and the belt-like continuous fiber is wound. The both ends of the sheet 5 are bonded with an adhesive or the like. Then, the gap h provided between the reinforced concrete column 1 and the surrounding steel plate 2 is filled with an adhesive 4 such as a grout material, and the reinforced concrete column 1 and the surrounding steel plate 2 are bonded to integrate them.
In addition, although the said strip | belt-shaped continuous fiber sheet 5 is wound around the surrounding steel plate 2, the both ends are adhere | attached with the adhesive agent etc., You may fix using other means, such as welding.

  As described above, according to the first embodiment, the belt-like continuous fiber sheet 5 is wound around the surrounding steel plate 2 to bind the surrounding steel plate 2, so that it is not necessary to perform a welding operation as in the prior art. Since there is no need for welding work, there is no fire caused by sparks generated during welding work. Therefore, it is possible to save time and labor for curing the spark.

  Moreover, since the surrounding steel plate 2 can be bound only by winding the strip | belt-shaped continuous fiber sheet 5, it does not depend on the technique of a welder like the past. Therefore, a uniform construction result can always be obtained. And since it is not necessary to ensure a skilled welder like the past, the cost accompanying it can be reduced.

  In the first embodiment, it is assumed that the reinforced concrete column 1 is a quadrangular column, but the first embodiment can be applied even if the reinforced concrete column 1 is a cylinder. However, when the reinforced concrete column 1 is a cylinder, each of the surrounding steel plates 2 and 2 is made semicircular and the butted portions are butted so that the inner diameter is more than the outer diameter of the reinforced concrete column 1 by an interval h. Only large cylinders must be formed.

The second embodiment of the present invention shown in FIG. 2 is characterized by a surrounding steel plate 6 that is a reinforcing material surrounding the reinforced concrete column 1, and other configurations are the same as those of the first embodiment. Therefore, in the following, the same components as those in the first embodiment are denoted by the same reference numerals.
As shown in FIG. 2, the enclosure steel plate 6 used for the reinforcing structure of the second embodiment has a L-shape as a whole by bending one edge at a right angle in a cross section taken along a line perpendicular to the longitudinal direction. With the right angle portion L as a boundary, one is a surrounding piece 7 and the other is an adjusting piece 8.

  In the case of the reinforced concrete column 1 having a quadrangular section, the enclosed steel plates 6 are used as a set of four sheets. As shown in FIG. 2, the right-angle portions L of the four enclosed steel plates 6 are respectively connected to the reinforced concrete columns 1. Install in correspondence with the four corners. And the adjustment piece 8 of the other enclosure steel plate 6 is made to overlap with the outer side of the enclosure piece 7 of one enclosure steel plate 6 adjacent to each other. At this time, a substantially constant distance H is provided between the surrounding steel plate 6 and the reinforced concrete column 1.

And the surrounding steel plate 6 which surrounded the reinforced concrete pillar 1 is bound by winding the strip | belt-shaped continuous fiber sheet 5 which is a binding member of this invention around the surrounding steel plate 6. FIG. The belt-like continuous fiber sheet 5 is wound around the surrounding steel plate 6 and then bonded at both ends.
When the four surrounding steel plates 6 are bundled with the belt-like continuous fiber sheet 5 as described above, this time, the adhesive 4 such as a grout material is formed at the interval H formed between the four surrounding steel plates 6 and the reinforced concrete column 1. , And the enclosure steel plate 6 is brought into close contact with the reinforced concrete column 1 to integrate them.

  As described above, according to the second embodiment, the belt-like continuous fiber sheet 5 is wound around the surrounding steel plate 6 to bind the surrounding steel plate 6, so that it is necessary to perform a welding operation as in the conventional case. There is no. Since there is no need for welding work, there is no fire caused by sparks generated during welding work. Therefore, it is possible to save time and labor for curing the spark.

  Moreover, since the surrounding steel plate 6 can be bundled only by winding the strip | belt-shaped continuous fiber sheet 5, it does not depend on the technique of a welder like the past. Therefore, a uniform construction result can always be obtained. And since it is not necessary to ensure a skilled welder like the past, the cost accompanying it can be reduced.

Furthermore, the L-shaped surrounding steel plate 6 used as the reinforcing material in the second embodiment can adjust the size of the inside of the quadrangular prism surrounded by four. That is, by sliding the overlapping part of the surrounding piece 7 and the adjusting piece 8 of the surrounding steel plates 6 adjacent to each other, the size of the inside of the quadrangular prism surrounded by four pieces can be changed.
For example, as shown in FIG. 3, if the enclosing piece 7 of one steel plate 6 is slid with respect to the adjusting piece 8 of the other steel plate 6 to provide an interval s, the length of one side is increased by the interval s. You can make a prism.

Since the size of the quadrangular column surrounded by the four enclosed steel plates 6 can be adjusted as described above, for example, even if there is some error in the external dimensions of the reinforced concrete column 1, by finely adjusting the enclosed steel plate 6, The interval H described above can be accurately maintained.
If the dimensions of the rectangular column formed by the surrounding steel plate 6 cannot be finely adjusted, the reinforced concrete column 1 to be reinforced must be accurately constructed according to the design dimension. However, it is quite difficult to accurately construct the reinforced concrete column 1 according to the design dimension. In practice, there are usually some errors from the design dimension.

  As described above, when the reinforced concrete column 1 has an error from the design dimension, if the dimension of the surrounding steel plate 6 cannot be adjusted, the interval H is not constant and is too large or too small. If the distance H is too large, a large amount of adhesive 4 such as a grout material is required, which leads to an increase in cost, and the thicker this adhesive 4 layer is, the more the reinforcing effect by the surrounding steel plate is reduced.

  On the other hand, if the distance H is too small, a sufficient amount of the adhesive 4 cannot be filled this time, which causes a problem that it is difficult to obtain an adhesive effect. In extreme cases, the interval H may not be secured. In this case, if the size of the surrounding steel plate 6 cannot be adjusted, the surrounding steel plate 6 must be remade or the periphery of the reinforced concrete column 1 must be shaved. If this happens, the cost increases will be immeasurable.

  In any case, in this second embodiment, the dimensions of the rectangular column formed by the surrounding steel plate 6 can be adjusted within the overlapping range of the surrounding piece 7 and the adjusting piece 8, so that the external dimensions of the reinforced concrete column 1 can be adjusted. Even if there is a slight error, the minimum necessary interval H for filling the adhesive 4 can always be ensured accurately. Since the necessary minimum interval H can be ensured accurately, there is no problem that the adhesive 4 has to be filled more than necessary or the necessary amount cannot be filled.

  In addition, the fact that the thickness of the square column surrounded by the surrounding steel plate 6 can be adjusted to some extent means that the above-described L-shaped enclosure steel plate 6 is mass-produced at the factory and corresponds to the reinforced concrete columns 1 of various thicknesses on site. be able to. In particular, if the length of the adjusting piece 8 in the overlapping direction is increased, the adjustable length becomes longer, and the versatility of the surrounding steel plate 6 is also increased.

  In addition, although the enclosure steel plate 6 of the said 2nd Embodiment formed the square pillar, according to the shape of the reinforced concrete pillar 1 to reinforce, the bending angle of the adjustment piece 8 may be changed. For example, if the reinforced concrete column 1 to be reinforced is a hexagonal column, the adjustment piece 8 may be bent according to the corner of the hexagonal column. In other words, various polygonal reinforced concrete columns 1 can be applied by changing the bending angle of the adjusting piece 8.

  Furthermore, if it shows as shown in FIG. 4, it can respond also to a column-shaped reinforced concrete pillar 1. FIG. In the enclosure steel plate 6 shown in FIG. 4, the enclosure piece 7 and the adjustment piece 8 are formed into arcs, and the curvature of the arc of the adjustment piece 8 is made larger than the curvature of the arc of the enclosure piece 7. The adjustment piece 8 is overlapped with the enclosure piece 7 of the other enclosure steel plate 6.

  However, when the enclosure piece 7 of the other enclosure steel plate 6 is overlapped on the adjustment piece 8 of one enclosure steel plate 6 as described above, each enclosure piece 7 continuously draws one circle. Therefore, also in this case, the thickness of the column formed by the surrounding steel plate 6 can be adjusted within the overlapping range of the surrounding piece 7 and the adjusting piece 8.

  In addition, the intensity | strength of the reinforcement structure in the said 1st, 2nd embodiment is determined by the winding amount of the strip | belt-shaped continuous fiber sheet 5 wound around a surrounding steel plate. In other words, the reinforcement strength with respect to the reinforced concrete column 1 can be adjusted by increasing or decreasing the winding amount of the strip-shaped continuous fiber sheet 5 wound around the surrounding steel plate. Therefore, when reinforcing the reinforced concrete column 1 that requires special strength, the reinforcing strength can be easily increased only by increasing the number of belt-like continuous fiber sheets 5 to be wound.

  The third embodiment of the present invention shown in FIG. 5 is characterized by a binding member that binds the surrounding steel plates 6, and the other configuration is the same as that of the second embodiment shown in FIG. 2. Therefore, in the following, the same components as those in the second embodiment are denoted by the same reference numerals.

As shown in FIG. 5, the binding member used in the third embodiment includes a plurality of connecting members 9 and tie rods 10 that connect two connecting members 9 adjacent to each other between the right-angle portions L of the surrounding steel plate 6. Yes. The connecting member 9 includes a pair of pressing pieces 9, 9a and a pair of connecting pieces 9b, 9b connected to the pressing pieces 9a, 9a.
The pressing pieces 9 a and 9 a are perpendicular to each other so as to correspond to the right angle portion L of the surrounding steel plate 6. Further, the connecting pieces 9b and 9b are bent at a right angle on the opposite side to the corners of the holding pieces 9a and 9a.

  Therefore, as shown in FIG. 5, if the right-angled portion formed of the pair of pressing pieces 9 a, 9 a is made to correspond to the right-angled portion L of the surrounding steel plate 6, two adjacent connecting pieces between the right-angled portions L of the surrounding steel plate 6. 9b and 9b face each other. In this way, the connecting pieces 9b, 9b facing each other are connected by a plurality of tie rods 10. This tie rod 10 is provided with a head portion 10a at one end and a threaded portion 10b at the other end. A nut 10c is fastened to the screw portion 10b.

The construction method of the reinforcement structure of 3rd Embodiment is shown below.
As shown in FIG. 5, the right-angle portions L of the four enclosed steel plates 6 are installed in correspondence with the four corners of the pillar 1. And the adjustment piece 8 of the other enclosure steel plate 6 is piled up inside the enclosure piece 7 of one enclosure steel plate 6 adjacent to each other, and the column 1 is enclosed. At this time, a substantially constant distance H is provided between the surrounding steel plate 6 and the column 1.

  Next, the right-angle portions composed of the pair of pressing pieces 9a and 9a of the connecting member 9 corresponding to the right-angle portions L of the four enclosed steel plates 6 surrounding the column 1 are brought into contact with each other. When the right-angled portion made of the holding pieces 9a, 9a is brought into contact with the right-angled portion L of the enclosure steel plate 6, the tie rod 10 is inserted between the connection pieces 9b, 9b of the adjacent connection members 9 between the right-angle portions L of the enclosure steel plate. To do.

  That is, a rod insertion hole is formed in the connecting piece 10b at a constant interval in the longitudinal direction, and the tie rod 10 is inserted into the rod insertion hole. At this time, the head portion 10a of the tie rod 10 is inserted outside, and the screw portion 10b opposite to the head portion is passed through the rod insertion hole formed in the opposing connecting piece 9b. Then, the nut 10c is fitted to the threaded portion 10b at the rod end that passes through the rod insertion hole.

  In the state where the connecting member 9 is stopped by the tie rod 10 as described above, the interval H between the surrounding steel plate 6 and the reinforced concrete column 1 is maintained. Thus, if the space | interval H is maintained, the adhesive material 4, such as a grout agent, will be filled into the space | interval H. Note that after the adhesive 4 is filled, the tightening force of the tie rod 10 may be finely adjusted to adjust the thickness of the adhesive 4 layer.

  As described above, also according to the third embodiment, the connecting member 9 is connected with the tie rod 10 around the surrounding steel plate 6 to bind the surrounding steel plate 6, so that it is not necessary to perform a welding operation as in the prior art. . Since there is no need for welding work, there is no fire caused by sparks generated during welding work. Therefore, it is possible to save time and labor for curing the spark.

  Moreover, since the surrounding steel plate 6 can be bound only by connecting the connection member 9 with the tie rod 10, it does not depend on the technique of a welder like the past. Therefore, a uniform construction result can always be obtained. And since it is not necessary to ensure a skilled welder like the past, the cost accompanying it can be reduced.

  In the third embodiment, the L-shaped enclosure steel plate 6 is bound by connecting the connecting member 9 with the tie rod 10, but the enclosure steel plate is a U-shape as in the first embodiment. It is also possible to use a steel plate. That is, the right-angled portion of the surrounding steel plate and the right-angled portion formed of the pressing pieces 9a, 9a of the connecting member 9 may be in contact with each other.

Further, the connecting member 9 of the third embodiment may be directly brought into contact with the corner portion of the reinforced concrete column 1 and bound by the tie rod 10. In this case, the connecting member 9 functions as a reinforcing material as it is.
Further, the tie rod 10 of the connecting member 9 has a head portion 10a at one end and a threaded portion 10b at the other end, but both ends may be tightened with nuts.

It is a perspective view which shows the reinforcement structure of 1st Embodiment. It is a perspective view which shows the reinforcement structure of 2nd Embodiment. It is sectional drawing which shows the state which made the sliding part of the enclosure piece 7 and the adjustment piece 8 of the enclosure steel plate 6 slide. It is sectional drawing which shows the surrounding steel plate 6 surrounding the column-shaped reinforced concrete pillar 1. FIG. It is a perspective view which shows the reinforcement structure of 3rd Embodiment. It is a perspective view which shows the conventional reinforcement structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reinforced concrete pillar 2 Enclosure steel plate 4 Adhesive material 5 Band-like continuous fiber sheet 6 Enclosure steel plate 7 Enclosure piece 8 Adjustment piece 9 Connection member 9a Holding piece 9b Connection piece 10 Tie rod 10a Head 10b Screw part 10c Nut h interval H interval L Right angle part

Claims (6)

  A reinforced concrete column reinforcement structure in which a reinforced concrete column is surrounded by a plurality of surrounding steel plates, and these surrounding steel plates are bound together by winding a plurality of binding members.   The reinforcing structure for a reinforced concrete column according to claim 1, wherein a plurality of surrounding steel plates are overlapped with each other.   The reinforcement structure of the reinforced concrete pillar of Claim 1 or 2 which provided the space | interval which inject | pours an adhesive material between a reinforced concrete pillar and an enclosure steel plate.   The reinforcing structure for a reinforced concrete column according to any one of claims 1 to 3, wherein the binding member is formed of a belt-like continuous fiber sheet.   Surrounding the reinforced concrete columns with a plurality of enclosing steel plates, these enclosing steel plates are bent at one edge of the cross section taken along a line perpendicular to the longitudinal direction, and enclose one of them at the bent portion. A reinforcing material for a reinforced concrete column, in which the other is an adjustment piece and the enclosure pieces of one enclosure steel plate of the enclosure steel plates adjacent to each other are superimposed on the adjustment piece of the other enclosure steel plate.   The enclosure steel plate is bent at right angles with the enclosure piece and the adjustment piece so as to be L-shaped as a whole, and the bundling member has a right-angle portion corresponding to the right-angle portion of the enclosure steel plate, and on both sides of the right-angle portion. The reinforcing material for a reinforced concrete column according to any one of claims 1, 2, 3, and 5, wherein the connecting pieces are erected and the connecting pieces are connected by tie rods.

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