JP2012036636A - Column reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a structure such as a beam or floor from being broken due to collision with enclosing steel plates used for reinforcing an existing column, even if the reinforced column is deformed on an occurrence of an earthquake or the like, while sufficiently increasing the strength of the existing column.SOLUTION: In a column reinforcement structure, in which a plurality of enclosing steel plates 2 are continuously arranged around a column 1 in the axial direction of the column, the enclosing steel plates 2 being bound by a strip-shaped sheet 3, and a grout material 4 being filled between the enclosing steel plates 2 and the column 1, a spacing S is provided between a beam 5 or floor 6 integrated with the column 1 and the enclosing steel plates 2 adjacent thereto, a plurality of reinforcement steel plates 7 are superposed on a part of the enclosing steel plates 2, and the circumference of the spacing S is surrounded by the reinforcement steel plates 7, the whole thereof being bound by the strip-shaped sheet 3. A grout material is filled in a continuous space defined by the reinforcement steel plates 7 and the enclosing steel plates 2, while the reinforcement steel plates 7 relatively move to the enclosing steel plates 2 when an impact deforming the column 1 acts on the reinforcement steel plates 7.

Description

  The present invention relates to a reinforcing structure suitable for, for example, retrofitting an existing column having a square cross section.

For example, in order to improve the earthquake resistance of a building, a structure shown in Patent Document 1 is known as a structure for retrofitting columns and walls. This conventional reinforcing structure reinforces the entire surface of a column having a square cross section.
Specifically, as shown in FIG. 5, the entire side surface of the column 1 having a quadrangular section is surrounded by four surrounding steel plates 2 having a L-shaped cross section in a plane perpendicular to the axial direction of the column 1. However, the right-angled part of each enclosure steel plate 2 is installed corresponding to the four corners of the pillar 1, respectively. And as shown in FIG. 5, the other piece of the other enclosure steel plate 2 is made to overlap with the piece of one enclosure steel plate 2 adjacent to each other. At this time, a substantially constant interval is provided between each of the surrounding steel plates 2 and the side surface of the column 1.

The surrounding steel plate 2 surrounding the column 1 is bound by winding the belt-like sheet 3 indicated by the alternate long and short dash line around the outer periphery of the surrounding steel plate 2 as described above.
When the four enclosed steel plates 2 are bundled with the belt-like sheet 3 as described above, the grout material 4 is filled in the space formed between the four enclosed steel plates 2 and the pillars 1. When this grout material 4 is solidified, the grout material 4 closely attached to the side surface of the column 1 and the surrounding steel plate 2 are integrated to reinforce the column 1.

JP 2005-023745 A

In the conventional reinforcing structure, the surrounding steel plate 2 having a predetermined interval is opposed to the entire periphery of the column 1 and the grout material 4 is filled in the interval, whereby the existing column 1 and the surrounding steel plate 2 are connected. The strength of the pillar 1 is improved by integrating.
And the beam 5 is connected to the upper end of the pillar 1 reinforced in this way, and the floor 6 is connected to the lower end (see FIG. 6). Therefore, of the surrounding steel plates 2 that are continuous in the axial direction, the upper end 2a of the surrounding steel plate 2 provided at the upper end contacts the lower surface of the beam 5, and the lower end 2b of the surrounding steel plate 2 provided at the lower end contacts the floor 6. is doing.

In such a state, when an external force due to an earthquake or the like acts on the reinforced column 1 and the column 1 is deformed, the upper end 2a of the surrounding steel plate 2 collides with the beam 5 and damages the beam 5. Sometimes.
Further, when the column 1 is deformed, the lower end 2b of the enclosure steel plate 2 may collide with the floor 6 and damage the floor 6.
As described above, even if the strength of the pillar 1 is improved by the reinforcing structure, if the pillar 1 is reinforced, the beam 5 and the floor 6 are damaged, but the entire building is not reinforced.

  The purpose of the present invention is to sufficiently improve the strength of existing pillars, and even if the reinforced pillars are deformed in the event of an earthquake, etc., the enclosure steel plates used to reinforce the pillars become structures such as beams and floors. It is to provide a column reinforcing structure that does not collide and damage the structure.

  A first invention is a building in which a pillar and at least one of a beam and a floor are integrated, and a plurality of surrounding steel plates are continuously arranged around the pillar in the axial direction of the pillar. In addition, in the reinforcing structure of a column in which the surrounding steel plates are bound with a belt-like sheet and the grout material is filled between the surrounding steel plates and the column, when the column is deformed by an earthquake or the like, the surrounding steel plate adjacent to the structure is In order not to hit the structure, a space is provided between the structure and the surrounding steel plate adjacent to the structure, and a plurality of reinforcing steel plates are part of the surrounding steel plate adjacent to the structure. These are reinforced steel plates, and the reinforcing steel plates surround the gaps and are bound by a belt-like sheet, and the grout material is filled into the continuous space formed by the reinforcing steel plates and the surrounding steel plates, while the pillars are deformed. Impact is above reinforced steel sheet When applied, characterized in that the reinforcing steel is in the configuration that moves relative to the enclosure steel.

The second invention is characterized in that the reinforcing steel plate and the surrounding steel plate are joined by spot welding.
A third invention is characterized in that a portion where the surrounding steel plate and the reinforcing steel plate are overlapped is integrally bound by the belt-like sheet.

According to a fourth aspect of the present invention, a reinforcing steel plate is superposed on the surrounding steel plate bound by the belt-like sheet, and the reinforcing steel plate is further bound by a belt-like sheet, while an insertion hole for inserting a stopper member is formed in the reinforcing steel plate. The stop member inserted into the column is fixed to the column, and the size of the insertion hole is made larger than that of the stop member.
The fifth invention is characterized in that the reinforcing steel sheet has an L-shaped cross section, a part of the L-shape is overlapped, and the overlapped portion is slidable.

In the first invention, since the gap is provided between both ends of the surrounding steel plate that surrounds the outer periphery of the column and a structure such as a beam or a floor, even if the column is deformed by an earthquake or the like, the surrounding steel plate is structured. There is no collision with the body.
In addition, since the above-mentioned interval is surrounded by a reinforcing steel plate and the inside is filled with a grout material, even if a space is provided between the surrounding steel plate and the structure, sufficient reinforcement strength is obtained and the column is deformed. Sometimes the reinforcing steel plate moves relative to the surrounding steel plate, so that the reinforcing steel plate does not collide with the structure.
Therefore, unlike the conventional column reinforcement structure, the surrounding steel plate does not collide with a structure such as a beam or a floor to damage the structure.

In the second invention, since the enclosure steel plate and the reinforcing steel plate are joined by spot welding, when the column is deformed and the enclosure steel plate tries to move integrally with the column, the spot welded portion with the reinforcement steel plate is easily divided. Therefore, the reinforced steel plate is easily moved relatively. That is, the reinforcing steel plate does not collide with the structure and damage the structure.
According to the third aspect of the invention, by connecting the enclosure steel plate and the reinforcing steel plate with the belt-like sheet, relative movement can be enabled while both are connected when an external force is applied.

  In the fourth invention, when the reinforcing steel plate is supported by the stopper member fixed to the pillar, the reinforcing steel plate is formed extensively and the insertion hole for inserting the stopper member is made larger than the stopper member, so that the pillar is deformed. In some cases, the reinforcing steel plate is movable in the range of the gap between the insertion hole and the stop member. In this way, if the reinforcing steel plate is movable relative to the stop member, it can be moved to a position where it does not collide with the structure such as a beam or a floor, and the reinforcing steel plate collides with the structure and breaks it. There is nothing.

  According to the fifth invention, the slidable reinforcing steel plate can absorb the impact on its sliding surface while relatively moving.

FIG. 1 is a front view of a first embodiment of the present invention. FIG. 2 is a perspective view of the first embodiment. FIG. 3 is a partial cross-sectional view of a continuous portion of the enclosure steel plate and the reinforcing steel plate according to the first embodiment. FIG. 4 is a partial cross-sectional view of a continuous portion of the enclosure steel plate and the reinforcing steel plate according to the second embodiment. FIG. 5 is a cross-sectional view of a conventional example. FIG. 6 is a front view of a conventional example.

1 to 3 show a first embodiment of the present invention.
In this embodiment, the same steel plate 2 as that of the above-described conventional steel plate 2 is used to surround the outer periphery of the pillar 1 at a predetermined interval and the grout material 4 is filled inside.
The surrounding steel plate 2 is the same as the conventional example in that the cross-sectional shape is L-shaped, the tips are slidably overlapped, and the belt-like sheet 3 is wound and bound.
However, in this 1st Embodiment, the space | interval S is maintained between the upper end 2a and the beam 5, and the lower end 2b and the floor | bed 6 of the some enclosure steel plate 2 made to continue in the axial direction of the pillar 1, respectively. Is a feature.

Furthermore, in this 1st Embodiment, the reinforcing steel plate 7 surrounding the said space | interval S is provided. As shown in FIG. 2, the reinforcing steel plate 7 is a steel plate having an L-shaped cross section similar to the surrounding steel plate 2, and the ends thereof are overlapped to form a quadrangle with a set of four sheets. The reinforcing steel plate 7 arranged in a square shape is overlapped with a part of the surrounding steel plate 2 adjacent to the beam 5, and the space S between the upper end 2 a of the surrounding steel plate 2 and the beam 5 is surrounded by the reinforcing steel plate 7.
Further, on the lower end 2 b side of the enclosure steel plate 2, the reinforcement steel plate 7 is overlapped with a part of the enclosure steel plate 2 adjacent to the floor 6, and the gap S between the lower end 2 b and the floor 6 is surrounded by the reinforcement steel plate 7. .
2 shows the arrangement of the surrounding steel plate 2 and the reinforcing steel plate 7 around the column 1, and the strip-like sheet 3 for binding the surrounding steel plate 2 and the strip-like sheet 3 for binding the reinforcing steel plate 7 are omitted. Yes.

  And in this 1st Embodiment, as shown in FIG. 3, the outer periphery of the part enclosed with the reinforcing steel plate 7 among the surrounding steel plates 2 continuous to an axial direction does not wind the said strip | belt-shaped sheet 3, but the reinforcing steel plate 7 It is connected with the spot welded part in direct contact. The spot welded portion 8 is configured to be divided by an impact that deforms the column 1 and to enable relative movement between the reinforcing steel plate 7 and the surrounding steel plate 2.

In this way, when the reinforcing steel plate 7 and the surrounding steel plate 2 are connected by the spot welded portion 8, the connecting portion is integrally bound by the belt-like sheet 3, and a continuous space constituted by the reinforcing steel plate 7 and the surrounding steel plate 2. Is filled with grout material 4 and solidified.
The enclosure steel plate 2 and the reinforcing steel plate 7 are not provided with a stopping means for the column 1, so if these steel plates 2, 7 are arranged at a predetermined interval with respect to the column 1, the form plate (not shown) The grout material 4 is filled after the position is fixed. This form is removed when the grout material 4 is solidified.

In the above-described reinforcing structure, the column 1 is integrated with the surrounding steel plate 2 via the grout material 4, and the bending and shear strength of the column 1 are improved.
When an external force due to an earthquake acts on the reinforced column 1 and the column 1 is deformed, stress is also generated at the joint between the enclosure steel plate 2 integrated with the column 1 and the reinforced steel plate 7. The spot weld 8 is broken. Thereby, the reinforcement steel plate 7 and the surrounding steel plate 2 are parted, and both can move relatively.
Therefore, the reinforcing steel plate 7 adjacent to the structure such as the beam 5 or the floor 6 does not escape from the structure and damage the structure. Moreover, since the space | interval S is provided between the upper-and-lower-ends 2a, 2b of the said surrounding steel plate 2, and the beam 5 and the floor 6, even if the pillar 1 deform | transforms and the surrounding steel plate 2 moves, the surrounding steel plate 2 Does not collide and damage the beam 5 or the floor 6.

In the first embodiment, a part of a plurality of surrounding steel plates 2 having an L-shaped cross section is slidably overlapped so as to surround the outer periphery of the pillar 1. However, the shape of the surrounding steel plates is as described above. However, the column 1 may be surrounded by butting the ends of adjacent steel plates.
In this embodiment, the reinforcing steel plate 7 is also L-shaped in cross section and partially overlapped so as to be slidable. However, the cross-sectional shape may not be L-shaped or may not be overlapped. Good.
However, if the surrounding steel plate 2 and the reinforcing steel plate 7 are arranged so as to be slidable, not only is it easy to adjust the size of the continuous space filled with the grout but also the vibration can be absorbed by the sliding surface. There are benefits.

FIG. 4 shows a second embodiment in which the reinforcing steel plate 7 is supported by the bolt 9 which is a fastening member of the present invention fixed to the column 1 instead of connecting the reinforcing steel plate 7 and the surrounding steel plate 2 by spot welding. It is a fragmentary sectional view.
And since this 2nd Embodiment is the same as the said 1st Embodiment except the structure which supports the reinforced steel plate 7, it shall refer also to FIG. 1, FIG. 2 also for the following description.
In the second embodiment, an insertion hole 10 for inserting the bolt 9 is formed in the reinforcing steel plate 7, and the bolt 9 inserted in the insertion hole 10 is fixed to the column 1. The reinforcing steel plate 7 is supported by the bolt 9 so as to hang.

And the said insertion hole 10 is made larger than the outer diameter of the said volt | bolt 9, and the clearance gap is made below the volt | bolt 9 in the state which the said reinforced steel plate 7 hung and supported by the volt | bolt 9.
In the second embodiment, a plurality of the insertion holes 10 are formed, and bolts 9 are inserted into the insertion holes 10 so that the reinforcing steel plate 7 surrounds the interval S without being inclined.
Moreover, in this embodiment, after the enclosure steel plate 2 is bundled with the belt-like sheet 3, the reinforcing steel plate 7 is provided along the outer periphery thereof, and the reinforcement steel plate is made of the belt-like sheet 3 different from the bundle of the enclosure steel plate 2. 7 is bound.

Further, the reinforcing steel plate 7 bound by the belt-like sheet 3 is not directly connected to the surrounding steel plate 2 but is held so as to be hung by the bolt 9. At this time, the upper end of the reinforcing steel plate 7 on the upper end 2 a side is The positions and dimensions of the bolt 9 and the insertion hole 10 are adjusted so that the lower end of the reinforcing steel plate 7 on the lower end 2b side contacts the lower surface of the beam 5 and the floor 6 contacts.
When the reinforcing steel plate 7 is supported by the bolt 9, the grout material 4 is filled in the continuous space formed by the reinforcing steel plate 7 and the surrounding steel plate 2 and solidified.
When the grout material 4 is solidified, the pillar 1 and the surrounding steel plate 2 are integrated with each other through the grout material 4 and the reinforcing steel plate 7 is also integrated with the grout material 4 to reinforce the column 1.

When the column 1 reinforced as described above is deformed by an impact such as an earthquake, the reinforcing steel plate 7 and the surrounding steel plate 2 move relative to each other. At this time, the reinforcing steel plate 7 that is in contact with the beam 5 and the floor 6 can move while being tilted within the gap of the insertion hole 10. Therefore, when the pillar 1 is deformed, the reinforcing steel plate 7 can move in a direction avoiding the beam 5 and the floor 6, and the reinforcing steel plate 7 does not damage the beam 5 and the floor 6.
Moreover, since the space | interval S is maintained between the enclosure steel plate 2 and the beam 5 or the floor 6 similarly to the said 1st Embodiment, when the pillar 1 deform | transforms, the said enclosure steel plate 2 will become the beam 5 or the floor 6. Naturally, the beam 5 and the floor 6 are not damaged by the collision (see FIGS. 1 and 2).
In the second embodiment as well, when the grout material 4 is filled, the position of the surrounding steel plate 2 is maintained by a mold material (not shown) or a support member.

  Further, the belt-like sheet 3 used in the first and second embodiments may be any type, but a sheet having some elasticity such as a fiber sheet impregnated with resin is suitable. If the belt-like sheet 3 has elasticity, the overlapped surrounding steel plate 2 and the reinforcing steel plate 7 can be easily slid, and the belt-like sheet 3 can also absorb shocks such as vibration.

  In addition, although the example which surrounds and reinforce | strengthens only the pillar 1 with the surrounding steel plate 2 is demonstrated above, when a wall continues to the pillar 1, with the surrounding steel plate 2 to the surface of an adjacent wall with the pillar 1 continuously. It is possible to reinforce the pillar 1 together with the wall by filling the grout material 4 inside the enclosure. Thus, when surrounding the wall surface with the surrounding steel plate 2, even in the portion corresponding to the wall, a space is maintained between the end portion of the surrounding steel plate 2 and the beam 5 or the floor 6, and this space is defined by the reinforcing steel plate 7. Enclose.

  The present invention is useful when reinforcing columns that do not need to be reinforced integrally with a beam or columns that cannot be reinforced integrally with a beam.

1 Column 2 Enclosure Steel Sheet 3 Strip Sheet 4 Grout Material 5 Beam 6 Floor 7 Reinforced Steel Sheet 8 Spot Welded Portion 9 Bolt 10 Insertion Hole

Claims (5)

  A structure in which a pillar and at least one of a beam and a floor are integrated, and a plurality of surrounding steel plates are continuously arranged around the pillar in the axial direction of the pillar, and the surrounding steel plates are strip-shaped. In the reinforcing structure of a column that is bundled with a sheet and filled with a grout material between the surrounding steel plate and the column, when the column is deformed by an earthquake or the like, the surrounding steel plate adjacent to the structure hits the structure. In order to prevent such a situation, an interval is provided between the structure and the surrounding steel plate adjacent to the structure, and a plurality of reinforcing steel plates are superposed on a part of the surrounding steel plate adjacent to the structure. The reinforcing steel plate surrounds the space and binds them with a belt-like sheet, and the continuous space formed by the reinforcing steel plate and the surrounding steel plate is filled with a grout material, while an impact that deforms the pillar is applied to the reinforcing steel plate. When acted Reinforcing structure of reinforcement steel sheet was configured to move relative to the enclosure steel pillars.   The column reinforcing structure according to claim 1, wherein the reinforcing steel plate and the surrounding steel plate are joined by spot welding.   The column reinforcing structure according to claim 1 or 2, wherein a portion where the surrounding steel plate and the reinforcing steel plate are overlapped is integrally bound by the belt-like sheet.   A reinforcing steel plate is superimposed on the enclosure steel plate bound by the belt-like sheet, and the reinforcing steel plate is further bound by the belt-like sheet, while an insertion hole for inserting a stopper member is formed in the reinforcing steel plate, and the stopper member inserted into the insertion hole is The column reinforcing structure according to claim 1, wherein the structure is fixed to the column and the size of the insertion hole is larger than that of the stop member.   The column reinforcing structure according to any one of claims 1 to 4, wherein the reinforcing steel sheet has an L-shaped cross section, a part of the L shape is overlapped, and the overlapping part is slidable.

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