JP4031919B2 - Seismic control and seismic reinforcement structure for existing buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic control / seismic reinforcement structure for an existing building.
[0002]
[Prior art]
In recent years, many buildings have been damaged by frequent earthquakes. In order to cope with such an earthquake, the new building is designed with consideration for earthquake resistance. On the other hand, since many existing buildings are inferior in earthquake resistance, there is a case where a column or beam itself is reinforced at the same time that a vibration-control brace or an earthquake-resistant brace is installed in a frame between the column and the beam.
[0003]
FIG. 10 shows an example of a seismic control and seismic reinforcement structure 22 for a concrete structure structure. A seismic control 25 is enclosed in a frame 25 surrounded by a column 23 and a beam 24 wound with steel plates or fiber sheets. A steel frame 27 having a brace (or seismic brace) 26 is attached. In this steel frame 27, stud bolts 28 and anchor bars 29 from the pillars 23 and the beams 24 are overlapped at a gap 30, and a mortar 31 is filled and attached thereto. Further, the seismic brace 26 absorbs seismic energy at an early stage as compared with a normal seismic brace, and therefore, it is necessary to transmit a small deformation of the peripheral frame via the steel frame 27. On the other hand, since the anchor muscle 29 has a small diameter, it is necessary to provide a large number to transmit a small deformation of the peripheral frame.
However, since the anchor bars 29 are inserted into the drilled holes after the finishing mortar of the pillars 23 and the beams 24 are inserted, noise, vibration, and dust are generated when a large number of anchor bars are provided. It was difficult to construct while doing daily work. For this reason, night construction or temporary relocation is required, which increases the construction cost and construction period. Since a large number of anchor bars 29 are continuously attached at a narrow interval, the steel plate 32 wound around the pillar 23 or the beam 24 is cut by a cross-sectional defect due to the attachment hole, and the seismic strength of the pillar 23 and the beam 24 is reduced. There was a problem that could not be raised.
[0004]
Therefore, as shown in FIG. 11, a concrete structure frame 33 is added around the existing pillars 23 and beams 24 to increase the proof stress, and anchor bars 29 are post-installed thereto to install the steel frame 27. Was.
[0005]
[Problems to be solved by the invention]
However, the above earthquake-resistant structure increases the cross-sectional area of the column and makes the room unusable, and requires new work such as rebar assembly, formwork installation, and concrete placement, which requires construction time and cost. There was a problem.
[0006]
The present invention has been made in view of these problems, and an object of the present invention is to provide a seismic / seismic reinforcement structure for an existing building that can reinforce a column or a beam simultaneously with the seismic reinforcement.
[0007]
In order to solve the above-mentioned problems, the existing building's seismic / seismic reinforcement structure is a structure in which a reinforcing member is wrapped around at least one of the pillars and beams of the concrete structure and is surrounded by these pillars and beams. A steel frame is installed in the gap between the steel frame and the pillars and beams, stud bolts projecting from the steel frame side, and connections projecting from the columns and beams cotter and is disposed overlapping mortar is filled, the connection cotter has a cylindrical body of large diameter steel pipe or precast concrete than anchors, it dug in core drill rotary, depth pillars muscle and It is characterized by being fixed with an adhesive in a hole only up to the front of the beam. Further, it is included that reinforcing bars are arranged in the overlapping portion of the stud bolt and the connecting cotter. In addition, it is included that the steel frame body is provided with any one of the damping damper, the damping brace, the earthquake-resistant steel plate, and the earthquake-resistant brace. The connecting cotter includes a hook provided on the outer periphery.
[0008]
Since columns or beams can be reinforced at the same time as reinforcement in the frame, there is no need to add a reinforcing concrete structure frame to the existing beams. The mortar, the steel frame, and the mortar in the gap between the column and the beam can be filled simultaneously between the existing column and the reinforcing member. Since the damping damper or the damping brace absorbs the earthquake energy at an early stage, it is required that the damping damper or the damping brace behave integrally with the surrounding frame even with a small deformation as compared with a normal earthquake resistant brace. Also, the connecting cotter is more rigid and proof than the post-installed anchor, so it is suitable for mounting damping dampers or damping braces, and the number of constructions is less than anchor bars. Because the connecting cotter is inserted into a groove dug by a rotary core drill, there is little generation of vibration, noise, and dust. Construction is possible. The connecting cotter can be attached safely and in a short time without damaging the reinforcing bars because the tip of the connecting cotter is inserted only to the front of the column bars or beam bars. Since the steel pipe or precast concrete column which is a connecting cotter has a diameter larger than that of the anchor bar, and the rigidity and proof stress per one increases, a sufficient reinforcing effect can be obtained without attaching a finishing mortar. The mortar filled in the gap can be reinforced by the reinforcing bars arranged in the overlapping portion of the stud bolt and the connecting cotter. Since the steel frame is rigidly joined to the surrounding concrete structure by the connecting cotter, dampers having various characteristics can be used for the damping damper or the damping brace.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the existing building seismic control / seismic reinforcement structure of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a seismic / seismic reinforcement structure 1 for an existing building according to a first embodiment, in which a steel plate 4 (or a fiber sheet) as a reinforcing member is wound around a column 2 in a reinforced concrete structure or a steel reinforced concrete structure. The steel frame 5 is installed in a frame surrounded by the pillar 2 and the beam 3.
[0010]
Inside the steel frame 5, a damping brace 6 of low yield point steel, or a damping damper such as an oil damper, an earthquake resistant steel plate, and an earthquake resistant brace (all not shown) are installed. A gap 7 formed between the steel frame 5 and the column 2 and the beam 3 includes a stud bolt 8 protruding from the steel frame 5 and a connecting cotter 9 protruding from the column 2 and the beam 3. Are arranged in layers. In addition, a spiral line which is a reinforcing bar 10 is arranged on the overlapping part of the stud bolt 8 and the connecting cotter 9 to reinforce the mortar 11 filled in the gap part 7.
[0011]
The connecting cotter 9 is a steel pipe or a column of precast concrete, and is inserted into the hole 12 dug in the pillar 2 and the beam 3 with a rotary core drill and fixed with an adhesive 13. 4 is welded to enhance the joining of the steel pipe. When the steel pipe is not provided with the flange 9a, it is fixed only with the adhesive 13. Since the hole 12 has a depth just before the column bar 14 or the beam bar 15, the hole 14 can be formed without damaging the reinforcing bars 14 and 15 and without generating noise, vibration, and dust. Further, since the connecting cotter 9 such as a steel pipe has a larger diameter than the anchor bars and has a higher rigidity and proof strength per one piece, the finishing mortar 16 is not connected and a sufficient number of the reinforcing bars can be obtained with a smaller number than the anchor bars. be able to. Moreover, since there are few attachment holes opened in the steel plate 4, a cross-sectional defect | deletion becomes small. Accordingly, it is possible to effectively cope with in-plane and orthogonal forces caused by an earthquake.
[0012]
FIG. 4 shows another reinforcing bar 10 arranged in the gap portion 7, and (1) has a spiral bar (or a closed type reinforcing bar) 18 arranged around the four axis bars 17. Is. On the other hand, (2) in the figure shows a ladder bar 19 arranged between shaft bars 17 arranged on both sides of the connecting cotter 9. These are properly used depending on the size of the steel frame body 5 and the width of the gap 7, but both sufficiently reinforce the mortar 11 and strengthen the integrity of the steel frame body 5, the column 2 and the beam 3.
[0013]
5 and 6 show the seismic control / seismic reinforcement structure 20 of the existing building according to the second embodiment, in which the steel plate (or fiber sheet) 4 is wound only on the beam 3, and other than this, The structure is the same as that of the existing building's seismic control / seismic reinforcement structure 1. Therefore, the frame 3 surrounded by the column 2 and the beam 3 can be reinforced by the steel frame 5 and the beam 3 can be reinforced at the same time.
[0014]
FIG. 7 shows a vibration control / seismic reinforcement structure 20a for an existing building according to the third embodiment. A steel plate (or a fiber sheet) 4 is wound around both the column 2 and the beam 3, and the column 2 and the beam 3 are wound. The steel frame body 5 is installed in a frame surrounded by, and the structure other than this is the same as that of the seismic control / seismic reinforcement structure 1 of the existing building of the embodiment. Therefore, the inside of the frame frame surrounded by the column 2 and the beam 3 can be reinforced by the steel frame 5 and at the same time the column 2 and the beam 3 can be reinforced. Accordingly, it is possible to effectively cope with in-plane and orthogonal forces caused by an earthquake.
[0015]
8 and 9 show a vibration control / seismic reinforcement structure 21 for an existing building according to the fourth embodiment. Among them, (1) shows that the seismic wall 21a constructed in the frame surrounded by the column 2 wound with the steel plate 4 as the reinforcing member and the beam 3 is connected to the column 2 by the connecting cotter 9 with connecting bars. And the beam 3 are integrally joined. On the other hand, (2) of the figure shows a seismic wall 21a constructed in a frame surrounded by a pillar 2 and a beam 3 wound with a steel plate 4 as a reinforcing member, which is a connecting cotter 9 with connecting bars. The column 2 and the beam 3 are integrally joined. All of these can reduce the generation of vibration, noise and dust, and can be constructed without stopping or relocating daily work.
[0016]
In addition to the above-described seismic damping / seismic reinforcement structure 1, in the above-described frame, that is, in a frame formed by winding a steel plate (or fiber sheet) 4 around at least one of the column 2 and the beam 3, A steel frame 5 having a displacement-dependent damper such as a low yield point steel is installed, and in the other frame (formed by winding a steel plate 4 around at least one of the column 2 and the beam 3). It is also possible to construct an anti-seismic and earthquake-resistant reinforcement structure in which the steel frame 5 having a speed-dependent damper such as an oil damper is installed. Further, in the gap 7 formed between the steel frame 5 and the column 2 and the beam 3, the stud bolt 8 protruding from the steel frame 5 side, the column 2 and the beam are formed in the same manner as described above. A connecting cotter 9 protruding from the 3 side is arranged in an overlapping manner and filled with mortar 11. When different types of dampers coexist in one structure in this way, any force caused by an earthquake can be dealt with.
[0017]
【The invention's effect】
Columns and beams can be reinforced at the same time as reinforcing the frame without adding reinforced concrete frames for existing columns or beams.
[0018]
The mortar, the steel frame, and the mortar in the gap between the column and the beam can be filled simultaneously between the existing column and the reinforcing member.
[0019]
Because the connecting cotter is inserted into a groove dug by a rotary core drill, there is little generation of vibration, noise, and dust. Construction is possible.
[0020]
Since the tip of the connecting cotter is inserted only up to the front of the column or beam, it can be attached safely and in a short time without damaging the reinforcing bars.
[0021]
Since the steel pipe or precast concrete column which is a connecting cotter has a diameter larger than that of the anchor bar, and the rigidity and proof stress per one increases, a sufficient reinforcing effect can be obtained without attaching a finishing mortar.
[0022]
The mortar filled in the gap can be reinforced by the reinforcing bars arranged in the overlapping portion of the stud bolt and the connecting cotter.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vibration control / seismic reinforcement structure for an existing building according to a first embodiment.
2 is a cross-sectional view taken along line AA in FIG. 1, and (2) is a cross-sectional view of a steel pipe.
3 is a cross-sectional view taken along line BB in FIG. 1, and (2) is a cross-sectional view taken along line CC in (1).
FIGS. 4A and 4B are cross-sectional views of a gap portion in which other reinforcing bars are arranged.
FIG. 5 is a cross-sectional view of a vibration control / seismic reinforcement structure for an existing building according to a second embodiment.
6 is a cross-sectional view taken along line DD of FIG. 5, and (2) is a cross-sectional view taken along line EE of FIG.
FIGS. 7A and 7B are cross-sectional views of an existing building anti-seismic and earthquake-proof reinforcement structure according to a third embodiment. FIGS.
FIGS. 8A and 8B are cross-sectional views of a seismic control and seismic reinforcement structure for an existing building according to a fourth embodiment.
FIGS. 9A and 9B are cross-sectional views of a seismic control and seismic reinforcement structure for an existing building according to a fourth embodiment. FIGS.
FIG. 10 is a cross-sectional view of a conventional vibration control / seismic reinforcement structure of an existing building.
FIGS. 11A and 11B are cross-sectional views of a conventional vibration control / seismic reinforcement structure of an existing building.
[Explanation of symbols]
1, 20, 21, 22 Damping and seismic reinforcement structure 2, 23 Column 3, 24 Beam 4, 32 Steel plate 5, 27 Steel frame 6, 26 Damping brace 7, 30 Gap 8, 28 Stud bolt 9 Connection Cotter 9a 鍔 10 Reinforcing bar 11, 31 Mortar 12 Hole 13 Adhesive 14 Column bar 15 Beam bar 16 Finishing mortar 17 Axial bar 18 Spiral bar 19 Ladder bar 22a Seismic wall 25 In-frame 29 Anchor bar 33 Concrete structural frame

Claims (4)

A reinforcing member is wound around at least one of a column and a beam of the concrete structure, and a steel frame is installed in a frame surrounded by the column and the beam. The steel frame, the column and the beam the gap formed between the stud bolt protruding from the steel frame side, are posts and are arranged projecting the cotter and is overlapped connection from the beam side filling mortar, cotter for the connection, It is a cylinder of steel pipe or precast concrete with a diameter larger than that of the anchor bar, and is characterized by being fixed with an adhesive in a hole drilled with a rotary core drill that has a depth just before the column and beam bars. Seismic control and seismic reinforcement structure for existing buildings. Seismic-seismic reinforcement structure of an existing building according to claim 1 in the overlapping portion between the connection Cotter the stud bolt, characterized in that the reinforcement is Haisuji. Steel frame Seismic dampers in, vibration control brace, seismic steel plate, vibration control, Retrofit of existing buildings according to claim 1 or 2, characterized in that one of the seismic brace is provided Construction. The seismic / seismic reinforcement structure for an existing building according to any one of claims 1 to 3, wherein the connecting cotter is provided with a flange on the outer periphery .

Images