JP2016061106A - Reinforcing structure for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further enhance a reinforcing effect of a reinforcing structure in which a steel frame is assembled in a space surrounded by an existing column and an existing beam.SOLUTION: The present invention relates to a reinforcing structure of a building that inserts a rectangular steel frame F with a brace into a rectangular space surrounded by a pair of existing columns 1 and a pair of existing upper and lower beams 2. The pair of existing columns 1 are surrounded with enclosure steel plates E1, E2, leaving an interval with the existing columns 1, and a grout material 15 is filled between the enclosure steel plates and the existing columns. An axial-direction bar 13 is placed at a corner 12 of the enclosure steel plates, along a longer-side direction of the existing column and continued to reach the pair of existing beams. The grout material 15 is filled, to form a reinforced column P that encloses the axial-direction bar. Top and bottom sides of the steel frame F are fixed on the existing beams 2 that face each other, and right and left sides of the steel frame F are brought in contact along the reinforced column P.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforcing structure for an existing building that incorporates a steel frame between a pair of existing columns and existing beams.

As a reinforcement structure of an existing building, a structure shown in FIG. 5 is conventionally known. This conventional reinforcing structure incorporates a steel frame F in a rectangular space A formed by a pair of existing columns 1 and 1 and existing beams 2 and 2.
A large number of anchor bolts 3 and 4 projecting inward are driven into the existing columns 1 and 1 and the existing beams 2 and 2.

On the other hand, the steel frame F is a rectangular frame material 5 provided with braces 6 and when it is fitted in the space A, the space between the existing columns 1 and 1 and the existing beams 2 and 2 is maintained. It is in size. A large number of anchor bolts 7 are provided around the frame material 5.
In addition, a spiral line 9 is disposed in the space formed between the steel frame F fitted in the space A and the existing columns 1 and 1 and the existing beams 2 and 2 and filled with the grout material 8. .

  If the grout material 8 is filled as described above, the existing columns 1 and 1 and the existing beams 2 and 2 and the steel frame F are integrated via the grout material 8. However, at this time, the anchor bolts 3, 4 provided on the existing columns 1, 1 and the existing beams 2, 2 and the anchor bolt 7 protruded around the frame material 5 are bonded to the grout material 8, so that the existing column 1 , 1 and the existing beams 2 and 2 and the steel frame F are integrated, and the spiral muscle 9 exerts a function of preventing the grout material 8 from being split.

Japanese Patent Laid-Open No. 9-067939

In the reinforcement structure of the conventional building as described above, in order to integrate the steel frame F with the existing columns 1 and 1 and the existing beams 2 and 2, these existing columns 1 and 1 and the existing beams 2 and 2 are integrated. A number of anchor bolts 3 and 4 must be driven into each.
However, when the anchor bolt 3 is driven into the existing columns 1 and 1, the existing columns 1 and 1 are weakened accordingly.
In particular, if a large number of anchor bolts 3 are driven in a situation where the existing pillars 1 and 1 are weakened due to secular change, the weakening is promoted, resulting in the following problems.

For example, as shown in FIG. 5, when the seismic force Q acts on the existing column 1 incorporating the steel frame F, the force is applied from the existing beam 2 to the steel frame F via the anchor bolts 4 and 7 and the grout material 8. Communicated. This force acts as a force for rotating the steel frame F and is also transmitted from the left and right side surfaces of the steel frame F to the existing column 1 via the anchor bolts 7 and 3.
However, the weakened existing pillar 1 cannot withstand the force acting from the steel frame F and sometimes collapses.

Thus, if the existing pillar 1 collapses, even if it reinforces using the steel frame F, the reinforcement effect will not be exhibited at all.
Further, if the existing pillar 1 surrounding the steel frame F collapses, the steel frame F may move and destroy the existing beam 2.
On the other hand, the steel frame F is easily maintained in a rectangular shape by the brace 6 and hardly undergoes in-plane deformation. However, if the existing pillar 1 and the existing beam 2 surrounding the steel frame F are destroyed as described above, the steel frame F cannot stay in the space A and jumps to the front.

  Therefore, in the conventional reinforcing structure of a building, depending on the magnitude of the seismic force, the steel frame F may be out of plane and jump out of the space A. If the steel frame F jumps out of the space A in this way, the reinforcing effect of the steel frame F is lost, and there is even a risk of causing a secondary disaster with the steel frame F that has jumped out.

The present invention relates to a reinforcing structure for a building in which a rectangular steel frame having reinforcing members on the inside is interposed in a rectangular space surrounded by a pair of existing columns and a pair of existing beams.
Then, the first invention is to surround the pair of existing columns and the intersection between the existing columns and the existing beams by surrounding steel plates with a predetermined distance, and at the corners of the surrounding steel plates surrounding the existing columns. Is provided with a continuous axial streak along the existing column to the pair of existing beams, and a reinforcing material including the axial streak filled with a grout material between the surrounding steel plate and the existing column and the existing beam. Configure the pillar.
The steel frame is interposed between the pair of reinforcing columns, and the upper and lower sides of the steel frame are coupled to the existing beams facing each other, and the left and right sides of the steel frame are brought into contact with the reinforcing columns. Yes.
The reinforcing member in the steel frame may be any member that can maintain the rectangular shape of the steel frame, and the shape thereof is not limited.

  2nd invention comprises the said surrounding steel plate combining the some division | segmentation steel plate, and has enclosed the circumference | surroundings of the existing pillar with this surrounding steel plate.

  In the third invention, a belt-like sheet is wound and bonded around the surrounding steel plate.

According to the reinforcing structure of a building in the first invention, the reinforcing column sufficiently reinforced by the grout material surrounded by the steel plate and the axial streak and the steel frame are in contact with each other, so that the transmission is transmitted through the steel frame. The reinforcing pillar is not damaged by force. And in the contact surface of a reinforcement pillar and a steel frame, the force of the reverse direction of an extension direction and a shrinkage direction mutually cancels, and can suppress both deformation | transformation.
In addition, since the reinforcing column contains the axial streak, the axial streak and the grout material are in close contact with each other, as if it were a tie rod that holds the space between the upper and lower existing beams located at the upper and lower ends of the reinforcing column. Exhibits the functions.

As described above, since the axial streak functions as a tie rod, for example, even when a large seismic force is applied, it is possible to suppress vertical deformation such as maintaining a distance between a pair of existing beams and extending a reinforcing column.
In addition, since the force is transmitted by bringing the steel frame into contact with the reinforcing column whose vertical direction deformation is suppressed by the above-described axial streak, the force can be applied even if the anchor bolt is not driven into the existing column as in the past. Can be transmitted, and the integrity of the reinforcing column and the steel frame is maintained. Thus, it is not necessary to drive anchor bolts into the existing pillars, so that the existing pillars are not weakened. Accordingly, the strength of the reinforcing column can be increased.

In addition, since the reinforcing column can sufficiently withstand the axial force, in-plane deformation of the rectangle surrounded by the reinforcing column and the existing beam is suppressed, and out-of-plane deformation of the steel frame caused by this in-plane deformation also occurs do not do.
Since out-of-plane deformation does not occur in this way, even if a large seismic force acts, the steel frame does not come off from the space surrounded by the reinforcing column and existing beams, and the reinforcement effect of the reinforcing column and the steel frame is synergistic. Can be demonstrated.
Moreover, it is possible to prevent a secondary disaster in which the steel frame is out of the space and jumps out to the front.

According to the reinforcing structure of a building in the second invention, since the enclosure steel plate is constituted by a plurality of divided steel plates, the conveyance performance of the enclosure steel plate and the workability when enclosing the circumference of the existing column are improved.
According to the reinforcing structure of a building in the third invention, since the belt-like sheet is wound around the divided steel plate and bonded to it, the grout material can be firmly restrained by the surrounding steel plate. As a result, the collapse of the grout material can be more strongly suppressed, and the integration between the axial streak and the existing column is increased, and the reinforcing effect is improved.

It is a front view of a 1st embodiment. It is a perspective view which shows a part of reinforcement pillar of 1st Embodiment. It is a perspective view which shows the state which enclosed a part of existing pillar with the enclosure steel plate of 1st Embodiment. It is a perspective view which shows the enclosure steel plate of 2nd Embodiment. It is a front view which shows the reinforcement structure of the conventional building.

1-3, the rectangular space A surrounded by the existing pillars 1 and 1 and the existing beams 2 and 2 has a rectangular shape composed of the frame material 5 and the braces 6 as in the conventional case. A steel frame F is incorporated. The bracing 6 is the reinforcing member of the present invention, but the reinforcing member may be any member that can hold the rectangular shape of the frame 5. The reinforcing member is not limited to the X-type disposed as shown in the figure, and a K-type or other configuration can be used.
As shown in FIGS. 2 and 3, the existing columns 1 and 1 are surrounded by a first surrounding steel plate E1, and this first surrounding steel plate E1 is composed of four divided steel plates 10 as shown in FIG. Yes. These four divided steel plates 10 are formed by bending a flat plate at a right angle, and the bent pieces are overlapped with each other to constitute a first rectangular steel plate E1 having a flat rectangular shape. In addition, the axial direction length of the said 1st enclosure steel plate E1 is made into the length which divided | segmented the axial direction length of the reinforcement object part of the existing pillar 1 into plurality.

As shown in FIGS. 2 and 3, the first enclosure steel plate E <b> 1 thus configured is laminated along the longitudinal direction of the existing columns 1, and a predetermined interval is provided between the first enclosure steel plates E <b> 1 and the existing columns 1. Keep trying.
Moreover, the intersection part of the existing pillar 1 and the existing beam 2 is enclosed with the 2nd surrounding steel plate E2 which straddles the existing pillar 1 and the existing beam 2, as shown in FIG.

A predetermined distance is also maintained between the second enclosure steel plate E2 and the existing pillar 1 and the existing beam 2, and both sides of the second enclosure steel plate E2 are fixed to the existing beam 2 with bolts 11 or the like. (See FIG. 2).
The second enclosure steel plate E2 thus configured is laminated on the first enclosure steel plate E1, and the space formed between the first and second enclosure steel plates E1, E2 and the existing pillar 1 is continued.

And the axial direction stripe | line | wire 13 is provided in the inner four corner parts 12 in the 1st enclosure steel plate E1, and this axial direction line | wire 13 is made to follow the existing pillar 1. FIG. The axial streak 13 thus formed maintains a length equal to or longer than the distance between the upper and lower existing beams 2 and 2 and penetrates through the second surrounding steel plate E2. However, the number of the axial streaks 13 may not be one, and for example, a necessary length may be realized by connecting a plurality of short axial streaks using a connecting jig or the like.
In addition, although the 2nd enclosure steel plate E2 in this 1st Embodiment is comprised with the single plate as shown in FIG. 2, you may comprise it with two division | segmentation steel plates.

  After laminating the first enclosure steel plate E1 as described above and fixing the second enclosure steel plate E2 to the existing beam 2, the belt-like sheet 14 made of tough fibers is wound around and adhered to the periphery of the first enclosure steel plate E1. . Moreover, the strip | belt-shaped sheet | seat 14 is affixed also to the 2nd enclosure steel plate E2, and the 1st and 2nd enclosure steel plates E1, E2 are connected also in the up-down direction by these strip | belt-shaped sheets 14.

When the belt-like sheet 14 is stretched around the first and second enclosure steel plates E1 and E2, the grout material 15 is filled between the first and second enclosure steel plates E1 and E2 and the existing pillar 1 and the existing beam 2. The reinforcing pillar P including the axial stripe 13 is formed.
The axial streak 13 in the reinforcing column P configured in this way is integrated with the existing column 1 by being in close contact with the grout material 15 and is also fixed to the upper and lower existing beams 2 and 2 via the grout material 15. In addition, it functions as if it were a tie rod that keeps the distance between the upper and lower existing beams 2 and 2.

Further, the steel frame F incorporated in the space A maintains a space for filling the grout material 16 in the portions facing the upper and lower existing beams 2 and 2, and the side surfaces of the existing beams 2 and 2 facing the steel frame F. In addition, a plurality of anchor bolts 17 projecting toward the steel frame F are provided. An anchor bolt 18 is also provided on the surface of the steel frame F facing the existing beams 2 and 2.
Further, a spiral line 9 is arranged between the existing beam 2 and the steel frame F.

Then, the upper and lower side surfaces of the steel frame F and the existing beams 2 and 2 are fixed by filling the grout material 16 between the steel frame F and the existing beams 2 and 2.
On the other hand, the left and right side surfaces of the steel frame F facing the reinforcing column P are in contact with the side surfaces of the reinforcing column P.

Next, the operation of the first embodiment will be described.
For example, when the seismic force in the direction of arrow Q shown in FIG. 1 is applied, the force is transmitted from the existing beam 2 on the upper side to the upper side of the steel frame F via the anchor bolts 17 and 18, and the reaction force is transmitted to the steel frame F. Acts on the lower side of. Further, the force acts as an axial force N that extends the frame upward on the left side surface S3 of the steel frame F.

At this time, when attention is paid to the left reinforcing column P in FIG. 1, a force in the extending direction acts on one side S1 side of the reinforcing column P, and a force in the contracting direction acts on the other side surface S2.
On the other hand, the force in the extending direction acts on the side surface S3 of the steel frame F in contact with the other side surface S2 of the reinforcing column P as described above. Therefore, the force in the shrinking direction on the side surface S2 of the reinforcing column P and the force in the extending direction on the side surface S3 of the steel frame F cancel each other.
Moreover, since the axial streak 13 of the reinforcing column P also functions as a tie rod that keeps the distance between the existing beams 2 and 2 as described above, the force in the extending direction on the side surface S1 and the force in the contracting direction on the side surface S2 of the reinforcing column P. Are pressed by the axial streak 13 and the extension of the reinforcing pillar P is suppressed.

  In addition, since the conventional anchor bolt 3 is not driven into the existing column 1 reinforced with the reinforcing column P, the existing column 1 is not weakened by reinforcement unlike the conventional case. Thus, since the existing pillar 1 is reinforced without weakening, the strength of the entire reinforcing pillar P is increased accordingly.

In addition, the existing pillar 1 has a volume increased by the grout material 15 and is surrounded by the first and second surrounding steel plates E1 and E2 around which the belt-like sheet 14 is wound, and has an integrated axial streak 13. As a result, the strength of the reinforcing column P is dramatically improved.
As described above, the function of the axial streak 13 as a tie rod, the cancellation of the force at the contact surface between the reinforcing column P and the steel frame F, and the strength increase of the reinforcing column P act synergistically, thereby The strength can be maintained.

Therefore, even if a large seismic force acts from the Q direction, the steel frame F does not jump out to the front, and the strengths of the reinforcing column P and the steel frame F can be exhibited without regret.
And the secondary disaster by the steel frame F dropping off can be prevented reliably.

The second embodiment shown in FIG. 4 is the same as the first embodiment except that the configuration of the first enclosure steel plate E1 is different from that of the first embodiment.
The first enclosure steel plate E1 is composed of four divided steel plates 19 bent substantially at right angles, and a horizontal rib 20 and a vertical rib 21 are formed on each edge of the divided steel plate 19.

Then, when the adjacent vertical ribs 21 are abutted with each other to form one first enclosed steel plate E1 with the four divided steel plates 19, and when the first enclosed steel plates E1 are stacked along the longitudinal direction of the pillars, 1 The transverse rib 20 of the steel plate E1 is butted.
In addition, although the 2nd enclosure steel plate E2 is not shown in FIG. 4 which shows this 2nd Embodiment, you may make it provide a horizontal rib or a longitudinal rib also in this 2nd enclosure steel plate E2.

Other configurations are the same as those in the first embodiment. That is, the reinforcing pillar P surrounded by the first and second surrounding steel plates E1 and E2 includes the axial streak 13 and winds and bonds the belt-like sheet 14 around the reinforcing pillar P. Then, the grout material 15 is filled between the first and second enclosure steel plates E1 and E2 and the existing pillar 1. Furthermore, the left and right side surfaces of the steel frame F are brought into contact with the pair of reinforcing columns P as described above.
The function as the reinforcing structure in the second embodiment thus configured is the same as that of the first embodiment.
Therefore, also in the second embodiment, the axial streak 13 functions to improve the bending strength of the reinforcing column P and to maintain the distance between the upper and lower existing beams 2 and 2. The frame F exhibits its strength without regret and realizes sufficient reinforcement strength.

In the first and second embodiments, since the joint portion between the existing column 1 and the existing beam 2 is covered with the grout material 15, it is possible to prevent the joint portion that tends to concentrate stress from being broken.
Further, in the step of laminating the first and second enclosure steel plates E1 and E2, the enclosure steel plates E1 and E2 continuous in the vertical direction may be connected to each other by welding or adhesion.
Furthermore, if the divided steel plates adjacent to each other in the circumferential direction are connected to each other, the binding force to the grout material 15 in the reinforcing column P increases, and the compression strength of the reinforcing column P can be improved accordingly.
In the second embodiment, it is also possible to connect the horizontal ribs 20 and the vertical ribs 21 with screws or clamps.

  It is most suitable for a reinforcing structure that incorporates a steel frame in a space surrounded by columns and beams.

DESCRIPTION OF SYMBOLS 1 Existing pillar 2 Existing beam A Space F Steel frame E1 1st enclosure steel plate 10 Split steel plate E2 2nd enclosure steel plate 12 Corner part 13 Axial reinforcement 14 Strip sheet 15 Grout material P Reinforcement pillar 19 Division steel plate

The present invention relates to a reinforcing structure for a building in which a rectangular steel frame having reinforcing members on the inside is interposed in a rectangular space surrounded by a pair of existing columns and a pair of existing beams.
Then, the first invention is to surround the pair of existing columns and the intersection between the existing columns and the existing beams by surrounding steel plates with a predetermined distance, and at the corners of the surrounding steel plates surrounding the existing columns. Is provided with a plurality of axial streaks that continue to the position of the upper and lower intersections along the existing pillars, and is filled with a grout material between the surrounding steel plate and the existing pillars and the existing beams. A pair of reinforcing pillars are included.
The steel frame is interposed between the pair of reinforcing columns thus configured, and the upper and lower sides of the steel frame are coupled to the existing beams facing each other, and the left and right side surfaces of the steel frame are contacted along the reinforcing columns. I am letting.
The reinforcing member in the steel frame may be any member that can maintain the rectangular shape of the steel frame, and the shape thereof is not limited.

When the belt-like sheet 14 is stretched around the first and second enclosure steel plates E1 and E2, the grout material 15 is filled between the first and second enclosure steel plates E1 and E2 and the existing pillar 1 and the existing beam 2. A pair of reinforcing pillars P including the axial streak 13 is formed.
The axial streaks 13 in the pair of reinforcing pillars P thus configured are integrated with the existing pillar 1 by being in close contact with the grout material 15, and are formed on the upper and lower existing beams 2 and 2 via the grout material 15. Is also fixed, and it functions as if it were a tie rod that keeps the distance between the upper and lower existing beams 2 and 2.

Claims (3)

A reinforcing structure of a building in which a rectangular steel frame with a reinforcing member spanned inside is interposed in a rectangular space surrounded by a pair of existing columns and a pair of existing beams,
Surround the surroundings of the pair of existing columns and the intersection between the existing columns and the existing beams with a surrounding steel plate while maintaining a predetermined distance,
In the corner portion of the surrounding steel plate surrounding the existing column, an axial streak that continues to the pair of existing beams along the existing column is provided,
While constituting a reinforcing column containing the above-mentioned axial streak by filling a grout material between the surrounding steel plate and the existing column and the existing beam,
While fixing the upper and lower of the steel frame to the existing beam facing,
A reinforcing structure of a building in which the left and right sides of the steel frame are brought into contact with the reinforcing column.   The reinforcing structure for a building according to claim 1, wherein a plurality of divided steel plates are combined to form the enclosure steel plate, and the surrounding steel plate is surrounded by the enclosure steel plate.   The reinforcing structure for a building according to claim 1 or 2, wherein a belt-like sheet is wound around and adhered to the periphery of the enclosure steel plate.

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