JP2020148068A - Buckling prevention member and reinforcement structure of column - Google Patents

Abstract

To provide a buckling prevention member and a reinforcement structure of a column capable of being applied also to an existing column and reinforcing the column effectively.SOLUTION: The buckling prevention member 10 is arranged on an outside surface of a column 3 along a longitudinal direction of the column 3. The buckling prevention member 10 is arranged over the entire length of the column 3. A reinforcement vertical member 15 is arranged along a vertical direction of the column 3 over the substantially entire length. A holding member 11a is arranged near both ends in longitudinal direction of the reinforcement vertical member 15 and a holding member 11b is arranged near center in longitudinal direction of the reinforcement vertical member 15. A standing member 19 standing as to face opposite side of the column 3 is arranged at substantially center in longitudinal direction of the reinforcement vertical member 15. The holding member 11a arranged at both ends in vertical direction of the reinforcement vertical member 15 and an end of the standing member 19 are coupled by a reinforcement diagonal member 17.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a buckling prevention member for seismic reinforcement and a reinforcing structure of columns.

In order to prevent the structure from collapsing due to an earthquake, the structure such as columns is required to have a seismic strength higher than a predetermined value. However, old structures may not meet the current seismic standards, as structures constructed before the current seismic standards were not required to have the strict seismic strengths of today.

However, it takes time and cost to newly reconstruct all the structures such as columns. Therefore, a method of reinforcing existing columns is adopted.

As a method of reinforcing such an existing column, there is a method of placing concrete around the column base portion of the existing column to construct a reinforced concrete root winding portion (for example, Patent Document 1).

Further, there is a reinforcing structure in which the outer periphery of the steel column is covered with a steel plate, reinforcing bars are arranged between the steel column and the steel plate, and the grout material is filled (for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 10-018424 Japanese Patent No. 5757510

However, as in Patent Document 1, it is not possible to suppress the buckling of the column only by reinforcing the column base. For example, in assembled columns such as truss columns and lattice columns, even if the column base is reinforced, if a strong load is applied in the vertical direction, the column may buckle, and the column is also reinforced against buckling. is necessary.

However, as in Patent Document 2, the method of covering the entire surface with a steel plate and a grout material has a large structure and a large pillar, so that the surrounding space is narrowed. Further, when applied to a pillar such as an assembly pillar, the assembly pillar is completely buried by a steel plate or the like, so that the field of view is obstructed and the other side of the existing pillar cannot be visually recognized.

The present invention has been made in view of such a problem, and provides an anti-buckling member and a column reinforcing structure that can be applied to existing columns and can efficiently reinforce columns. The purpose.

In order to achieve the above-mentioned object, the first invention is a buckling prevention member for reinforcing a column, the reinforcing vertical member arranged along the vertical direction of the column, and at least the reinforcing vertical member. A fixing member arranged near both ends and the center in the longitudinal direction and fixed to the outer surface of the column, an upright member standing substantially in the center in the longitudinal direction of the reinforcing vertical member, and both ends of the reinforcing vertical member. The buckling prevention member is provided with a reinforcing diagonal member that connects the vicinity and the end portion of the upright member.

According to the first invention, since the reinforcing diagonal member is arranged on the standing member that stands up at the substantially central portion of the reinforcing vertical member, the reinforcing vertical member is suppressed from being deformed to the standing member side. Therefore, by arranging the reinforcing vertical members along the columns, deformation of the columns can be efficiently suppressed. Therefore, it is possible to prevent the column from buckling when a compressive force is applied to the column.

The second invention is a structure for reinforcing a column using a first buckling prevention member, wherein the upright member faces the opposite side of the column along the longitudinal direction of the column. It is a column reinforcement structure characterized in that a buckling prevention member is arranged on the outer surface of the column.

The pillar is an assembly pillar having a vertical member and a diagonal member connecting the vertical members, and the end portion of the fixing member may be fixed to the vertical member.

A spacer is arranged integrally or separately from the fixing member at the fixing portion between the vertical member of the pillar and the fixing member of the buckling prevention member, and is provided between the buckling prevention member and the pillar. It is desirable that a gap is formed.

Holes may be formed in the fixing members at both ends in the vertical direction, both ends of the reinforcing vertical member may be inserted into the holes, and the fixing members at both ends in the vertical direction and the reinforcing vertical member may be trimmed. ..

A plurality of the buckling prevention members may be arranged in the longitudinal direction of the pillar so that some of them overlap each other, and the ends of the standing members of the plurality of buckling prevention members may be connected to each other.

It is desirable that the buckling prevention member is arranged on four surfaces of the outer peripheral surface of the pillar.

According to the second invention, the pillar can be efficiently pressed from the outer peripheral side, and the pillar can be prevented from buckling.

Further, it is easy to apply even when the pillar is an assembled pillar, and at this time, since the outer circumference of the pillar is not covered with concrete, a steel plate or the like, the field of view is not obstructed.

Further, since the spacer forms a gap between the column and the buckling prevention member, the buckling prevention member and the piping do not interfere with each other even when the piping or the like is installed on the outer peripheral portion of the column. ..

Further, since the fixing members at both ends in the vertical direction and the reinforcing vertical member are edge-cut, the compressive force applied to the column is not transmitted to the reinforcing vertical member, and the reinforcing vertical member is prevented from buckling. Can be done.

In addition, a plurality of buckling prevention members are arranged so that the buckling prevention members overlap each other in the longitudinal direction, and the ends of the standing members are connected to each other to shorten the total length of the buckling prevention members. can do.

Further, by arranging the buckling prevention members on the four outer peripheral surfaces of the column, deformation due to buckling in all directions of the column can be prevented.

According to the present invention, it is possible to provide a buckling prevention member and a column reinforcing structure that can be applied to existing columns and can efficiently reinforce the columns.

The perspective view which shows the reinforcement structure 1 of a column. The front view which shows the reinforcement structure 1 of a column. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2, showing a reinforcing structure 1 of a column. B part enlarged view of FIG. The plan view which shows the reinforcement structure 1 of a column. The plan view which shows the reinforcement structure 1a of a column. The side view which shows the reinforcement structure 1b of a column.

Hereinafter, the column reinforcing structure 1 according to the embodiment of the present invention will be described. 1 is a perspective view showing the reinforcing structure 1 of the column, FIG. 2 is a front view of the reinforcing structure 1 of the column, and FIG. 3 is a sectional view taken along line AA of FIG. In FIGS. 1 to 3, only one surface of the pillar is shown, and the other surface is omitted.

The column reinforcing structure 1 is composed of a column 3, a buckling prevention member 10, and the like. The pillar 3 has a vertical member 5 and a diagonal member 7 obliquely arranged between the vertical members 5. The pillar 3 is, for example, an assembly pillar composed of a plurality of trusses. That is, in the pillar 3, four vertical members 5 (only two are shown in the figure) are arranged, and a plurality of diagonal members 7 are arranged between the vertical members 5 so as to connect the vertical members 5 to each other. The pillar.

The column 3 may be a prism or an H steel column instead of an assembled column. When the pillar 3 is an assembled pillar, the back side of the pillar 3 to which the buckling prevention member 10 is attached can also be visually recognized. Further, the column reinforcement structure 1 may be a reinforcement for the existing column 3, or may be applied when the column 3 is newly installed.

A buckling prevention member 10 is arranged on the outer surface of the pillar 3 along the longitudinal direction of the pillar 3. The buckling prevention member 10 is arranged over the entire length of the pillar 3.

The buckling prevention member 10 is mainly composed of a reinforcing vertical member 15, fixing members 11a and 11b, an upright member 19, a reinforcing diagonal member 17, and the like. The reinforcing vertical member 15 is arranged along the vertical direction of the column 3 over substantially the entire length of the column 3. The fixing members 11a are arranged near both ends of the reinforcing vertical member 15 in the longitudinal direction, and the fixing members 11b are arranged near the central portion of the reinforcing vertical member 15 in the longitudinal direction. The fixing members 11a and 11b are fixed to the outer surface of the pillar 3. More specifically, the fixing members 11a and 11b are arranged in the width direction of the pillar 3 so as to straddle the pair of vertical members 5, and the ends of the fixing members 11a and 11b are joined to the vertical members 5.

Here, as shown in FIG. 3, a spacer 13 is arranged between the fixing members 11a and 11b and the pillar 3 (vertical member 5). That is, a spacer 13 is arranged at the fixing portion between the vertical member 5 of the pillar 3 and the fixing members 11a and 11b of the buckling prevention member 10, and the fixing members 11a and 11b are joined to the vertical member 5 via the spacer 13. To. The spacer 13 may be integrated with the fixing members 11a and 11b, or may be a separate body.

By arranging the spacer 13 between the pillar 3 and the buckling prevention member 10 in this way, a gap 9 corresponding to the thickness of the spacer 13 can be formed between the buckling prevention member 10 and the pillar 3. it can. By forming the gap 9 between the pillar 3 and the buckling prevention member 10, even when the piping or the like is arranged on the outer periphery of the pillar 3, the piping or the like and the buckling prevention member 10 do not interfere with each other.

The fixing members 11a and 11b, the spacer 13 and the vertical member 5 may be joined by welding, or may be joined by bolts or the like.

An upright member 19 that stands up so as to face the side opposite to the column 3 is arranged at a substantially central portion in the longitudinal direction of the reinforcing vertical member 15. The fixing members 11a and 11b, the reinforcing vertical member 15 and the upright member 19 are steel materials such as H-shaped steel.

The vicinity of both ends of the reinforcing vertical member 15 in the vertical direction and the ends of the standing member 19 are connected by the reinforcing diagonal member 17. That is, the reinforcing diagonal member 17 is arranged obliquely with respect to the reinforcing vertical member 15, and is arranged from the vicinity of both ends of the reinforcing vertical member 15 to the top of the standing member 19. As the reinforcing diagonal member 17, a long body such as a steel wire (steel rod) is used. A predetermined tension may be applied to the reinforcing diagonal member 17.

FIG. 4 is an enlarged view of part B of FIG. Holes 21 are formed in the fixing members 11a at both ends in the vertical direction. At both ends of the reinforcing vertical member 15, diameter-reduced portions 15a having an outer diameter smaller than that of other portions are formed. The reduced diameter portion 15a is inserted into the hole 21. The reduced diameter portion 15a may be formed by cutting out a part of the end portion of the reinforcing vertical member 15, or may be formed by welding a steel rod or the like. That is, the fixing members 11a arranged at both ends of the reinforcing vertical member 15 in the vertical direction are not joined to the reinforcing vertical member 15. The reinforcing vertical member 15 is joined only to the fixing member 11b located at the center in the longitudinal direction.

The length of the portion of the reinforcing vertical member 15 excluding the reduced diameter portion 15a is slightly shorter than the distance between the fixing members 11a arranged near the upper and lower ends of the column 3. In this way, the reinforcing vertical member 15 and the fixing member 11a are edge-cut, and a clearance is formed between the reinforcing vertical member 15 and the fixing member 11a. Therefore, a compressive force (fixing members 11a to each other) is formed on the column 3. Even when a force in the approaching direction is applied, the compressive stress is not transmitted to the reinforcing vertical member 15. Therefore, the compressive force applied to the column 3 is transmitted to the reinforcing vertical member 15, so that the reinforcing vertical member 15 can be prevented from buckling.

FIG. 5 is a plan view of the reinforcing structure 1 of the column. As described above, the pillar 3 has a substantially rectangular shape, and in the illustrated example, the pillar 3 has a substantially square cross-sectional shape. In this case, the buckling prevention member 10 is arranged on each of the four outer peripheral surfaces of the pillar 3.

When a compressive force is applied to the column 3 and the column 3 buckles, the column 3 is deformed so as to bulge in at least one direction. However, a buckling prevention member 10 is arranged on the outer peripheral portion of the column 3, and the column 3 is pressed from the outer peripheral side by the reinforcing vertical member 15 and the fixing members 11a and 11b. Further, since the substantially central portion of the reinforcing vertical member 15 is pressed from the outer peripheral side by the reinforcing diagonal member 17, the deformation of the reinforcing vertical member 15 is suppressed. By arranging the buckling prevention member 10 in each direction of the pillar 3 in this way, the pillar 3 is suppressed from being deformed in any direction. Therefore, the buckling of the pillar 3 is suppressed.

Although an example in which the buckling prevention member 10 is arranged on all four surfaces of the pillar 3, the present invention is not limited to this. FIG. 6 is a plan view showing the reinforcing structure 1a of the column. In the column reinforcing structure 1a, the column 3 is not a substantially square but a rectangle. In this case, a pair of buckling prevention members 10 may be arranged on the outer peripheral portion on the long side side of the pillar 3. That is, the buckling prevention member 10 may not be arranged on the outer peripheral portion on the short side, and the buckling prevention member 10 may be arranged only on the long side facing each other.

When the pillar 3 is rectangular, the cross-sectional coefficient of the pillar 3 makes it easy for the pillar 3 to bend in the direction in which the center of the short side is the neutral axis, as opposed to the bending in which the center of the long side is the neutral axis. Therefore, by arranging the buckling prevention member 10 only in the direction in which the pillar 3 is easily bent, the deformation of the pillar 3 can be efficiently suppressed and the buckling can be suppressed.

As described above, according to the present embodiment, by arranging the buckling prevention member 10 on the outer peripheral portion of the pillar 3, it is possible to efficiently suppress the buckling of the pillar 3 when the pillar 3 receives a compressive force. Can be done. At this time, since the reinforcing vertical member 15 is pressed from the outside by the reinforcing diagonal member 17, it is possible to prevent the reinforcing vertical member 15 itself from being deformed.

Further, by arranging the spacer 13 between the pillar 3 and the buckling prevention member 10, a gap 9 can be formed between the buckling prevention member 10 and the pillar 3. Therefore, even when the pipe or the like is arranged on the outer periphery of the pillar 3, the pipe or the like does not interfere with the buckling prevention member 10.

Further, since both ends of the reinforcing vertical member 15 are not joined to the fixing member 11a and the edges are cut, the compressive force is transmitted to the reinforcing vertical member 15 when the compressive force is applied to the column 3. There is no. Therefore, the reinforcing vertical member 15 does not buckle due to the compressive force on the column 3.

As described above, the buckling prevention member 10 of the present embodiment can be easily attached to the existing pillar 3. Further, the construction is easier than that covering the entire column, and when the column 3 is an assembled column, even if the buckling prevention member 10 is arranged, the view is hardly obstructed.

The force from the column 3 to the buckling prevention member 10 is transmitted only at the positions of the fixing members 11a and 11b, but a spacer member or the like is placed inside the reinforcing vertical member 15 between the fixing members 11a and 11b. The spacer member or the like may be joined and brought into contact with the vertical member 5 or the diagonal member 7 of the column 3. By doing so, the force from the column 3 can be transmitted not only to the fixing members 11a and 11b but also to the reinforcing vertical member 15 at the position of the spacer member.

Further, the buckling prevention member 10 needs to be arranged over the entire length of the column 3, but the reinforcing vertical member 15 does not necessarily have to have the same length as the column 3. For example, as in the column reinforcing structure 1b shown in FIG. 7, a plurality of buckling prevention members 10 may be arranged over the entire length of the column 3.

In this case, a plurality of buckling prevention members 10 are arranged in the longitudinal direction of the pillar 3 so that some of them overlap each other. The reinforcing vertical members 15 of the buckling prevention member 10 are arranged so as to be offset from each other in the width direction of the column 3 so as not to interfere with each other. Further, by arranging the plurality of buckling prevention members 10 so as to be offset by exactly half the length, the fixing members can be shared with each other.

For example, the uppermost fixing member 11a functions only as a fixing member of the upper buckling prevention member 10, and the lowermost fixing member 11a functions only as a fixing member of the lower buckling prevention member 10. To do. On the other hand, a fixing member 11c is arranged in place of the fixing member 11b at the center of each buckling prevention member 10.

The fixing member 11c is joined to the reinforcing vertical member 15 of one buckling prevention member 10, but is cut off without being joined to the reinforcing vertical member 15 of the other buckling prevention member 10. For example, the upper fixing member 11c (the second fixing member from the top in the drawing) is joined to the reinforcing vertical member 15 of the upper buckling prevention member 10, but the reinforcing vertical member 15 of the lower buckling prevention member 10 is joined. A hole 21 is formed at the position of, and the end portion of the reinforcing vertical member 15 is inserted into the hole 21. Similarly, the lower fixing member 11c (third fixing member from the top in the figure) is joined to the reinforcing vertical member 15 of the lower buckling prevention member 10, but the reinforcing vertical member of the upper buckling prevention member 10 is joined. A hole 21 is formed at the position of 15, and the end portion of the reinforcing vertical member 15 is inserted into the hole 21.

The ends of the upright members 19 of the buckling prevention members 10 are connected by a connecting member 23. By doing so, stress is transmitted between the buckling prevention members 10, and buckling can be prevented over the entire length of the column 3.

Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention does not depend on the above-described embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b ………… Column reinforcement structure 3 ………… Column 5 ………… Vertical member 7 ………… Slanted member 9 ………… Gap 10 ………… Buckling prevention members 11a, 11b, 11c ………… Fixing member 13 ………… Spacer 15 ………… Reinforcing vertical member 15a ………… Reduced diameter portion 17 ………… Reinforcing diagonal member 19 ………… Standing member 21 ………… Hole 23 ………… Connecting member

Claims (7)

A buckling prevention member for reinforcing columns
Reinforcing vertical members arranged along the vertical direction of the columns,
At least, a fixing member that is arranged near both ends and the center of the reinforcing vertical member in the longitudinal direction and fixed to the outer surface of the column.
An upright member that stands up at a substantially central portion in the longitudinal direction of the reinforcing vertical member,
A reinforcing diagonal member that connects the vicinity of both ends of the reinforcing vertical member and the end of the standing member,
A buckling prevention member characterized by comprising. A column reinforcing structure using the buckling prevention member according to claim 1.
A column reinforcing structure, characterized in that a buckling prevention member is arranged on an outer surface of the column along the longitudinal direction of the column so that the upright member faces the opposite side of the column. The pillar is an assembly pillar having a vertical member and a diagonal member connecting the vertical members to each other.
The column reinforcing structure according to claim 2, wherein the end portion of the fixing member is fixed to the vertical member. A spacer is arranged integrally or separately from the fixing member at the fixing portion between the vertical member of the pillar and the fixing member of the buckling prevention member, and is provided between the buckling prevention member and the pillar. 3 is a column reinforcing structure according to claim 3, wherein a gap is formed. Holes are formed in the fixing members at both ends in the vertical direction, both ends of the reinforcing vertical member are inserted into the holes, and the fixing members at both ends in the vertical direction and the reinforcing vertical member are edge-cut. The column reinforcing structure according to any one of claims 2 to 4, which is characteristic. A plurality of the buckling prevention members are arranged in the longitudinal direction of the pillar so that some of them overlap each other.
The column reinforcing structure according to any one of claims 2 to 5, wherein the ends of the standing members of the plurality of buckling prevention members are connected to each other. The column reinforcing structure according to any one of claims 2 to 6, wherein the buckling prevention member is arranged on four surfaces of the outer peripheral surface of the column.

Images