JP2001317215A - Earthquake-resisting reinforcing construction method for existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct a new wall without generating noises, vibrations, dust or the like in a space enclosed by a column and a beam. SOLUTION: Cores 4 for connection, from which connecting bars 6 are projected, are installed onto at least one opposed surface in the space enclosed by the columns 1 and the beams 2 for the existing building, and reinforcing bars are arranged extending over these opposed connecting bars, thus building the wall. The cores for connection are fitted into fitting grooves formed to the opposed surface, and formed of a pipe body or a precast-concrete column body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for retrofitting existing buildings.

[0002]

2. Description of the Related Art In recent years, many buildings have been damaged by frequent earthquakes, and some buildings have collapsed due to the earthquake. Therefore, newly-built buildings are often designed in consideration of earthquake resistance.

[0003] A new type of seismic isolation / seismic structure having such high seismic resistance has recently been developed due to the development of technology, and its practical use is rapidly progressing. On the other hand, many existing buildings have inferior seismic performance, and the current situation is that seismic reinforcement such as shear walls and braces is applied later.

As such a seismic retrofitting method, for example,
A conventional example as shown in FIG. 7 is known. This is pillar 1
9. A new wall 21 is constructed in a space surrounded by the beam 20, and a reinforcing bar 23 is arranged over the connecting bar 22 fixed to the opposing surfaces of the left and right pillars 19 and the upper and lower beams 20, thereby forming the wall 21. To construct. (2) in the same figure represents a connecting bar before the wall 21 is constructed.

[0005]

However, in the above-mentioned seismic retrofitting method, the finishing mortar on the opposing surfaces of the right and left columns and the upper and lower beams is cut with a cutter or a hammer drill, and then a hole for fixing the connecting bar is formed. Therefore, there is a problem that noise, vibration, dust and the like are generated.

Accordingly, an object of the present invention is to construct a new wall in a space surrounded by columns and beams without generating noise, vibration, dust and the like.

[0007]

According to a first aspect of the present invention, a connecting bar is provided on at least one of opposing surfaces of a space surrounded by columns and beams of an existing building. The connecting cores provided are provided, and reinforcing walls are arranged over these connecting connecting bars to form a wall. The invention according to claim 2 is the invention according to claim 1, wherein the connecting core is an opposing surface. The invention according to claim 3 is characterized in that the connection core is a pipe or a precast concrete column, wherein the connection core is a pipe or a precast concrete column. Claims 1 to 3
In any one of the above, a flange is formed on the outer periphery of the connection core, and the invention of claim 5 is characterized in that, in any one of claims 3 and 4, And a drop-off prevention pin whose both ends are pushed outward.

[0008] Since connecting bars are provided on the opposing surfaces of the beams or columns by the connecting cores, it is not necessary to provide holes for fixing the connecting bars. Further, since the fitting groove of the connection core is opened by a core drill from above the finishing mortar of the beam, generation of noise, vibration, dust and the like can be prevented. Also, the connecting core of the tube or precast concrete column buried between the joints of the wall and the beam or column provides great resistance to out-of-plane and in-plane forces. In addition, the connection core can be easily installed on the opposing surface of the beam or the column by the flange, and the connection core can be mounted in a well-balanced and stable manner.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a seismic retrofitting method for an existing building according to the present invention. 1 to 5 show a reinforcing method according to the first embodiment, and FIG. 6 shows a reinforcing method according to the second embodiment.

The reinforcing method according to the first embodiment is to construct a new earthquake-resistant wall in a space 3 surrounded by columns 1 and beams 2 of an existing building as shown in FIG. The connection core 4 shown is used. The connecting core 4 is a steel pipe 5 of an appropriate length.
A pair of connecting bars 6 is welded to the outer peripheral surface of the steel pipe 5, and a part of the connecting bars 6 protrudes from the steel pipe 5.

First, as shown in FIG. 2 (2), fitting grooves 8 are provided on the facing surfaces of the upper and lower beams 2 from above the finishing material 7 by a core drill. The fitting grooves 8 are provided facing each other,
The size is such that the connection core 4 can be fitted. The fitting groove 8 is filled with an adhesive 9. The adhesive 9 may be applied to the outer peripheral surface of the connecting core 4.

Next, as shown in (3) and (4) of the same figure, the connecting core 4 is inserted into the fitting groove 8 filled with the adhesive 9.
Are fitted so that the connecting bars 6 are located inside and outside the wall, and the connecting core 4 in the upper beam 2 is held down by the falling-off prevention pins 6a so as not to drop until the adhesive 9 is hardened. . When the connection core 4 is fitted into the fitting groove 8 filled with the adhesive 9 in this manner, the connecting bars 6 are arranged at appropriate intervals on the opposing surfaces of the upper and lower beams 2. The falling-off prevention pin 6a has an inverted V-shape and is provided at the lower end of the tubular body 6 so as to be always pushed outward.

Next, as shown in FIG. 1, the vertical bars 10 on the wall are arranged, and the horizontal bars 11 perpendicular to the vertical bars 10 are arranged. Then, concrete is poured into a wall form (not shown) formed so as to surround the reinforcing bars 10 and 11, and when this hardens, the wall form is dismantled to construct the earthquake-resistant wall 13 (see FIG. 3). The anti-seismic wall 13 and the beam 2 are firmly connected by the connecting core 4 and the connecting bar 6 disposed over the anti-seismic wall 13 and also against in-plane and out-of-plane forces of the anti-seismic wall 13. It becomes a big resistance.

FIG. 4 (1) shows another embodiment of the connecting core, in which a flange 14 is provided on the outer periphery of the steel pipe 5 of the connecting core 4 in FIG. The mounting becomes simple as a glue allowance (see (2) in the figure). Further, since the flange 14 is not influenced by the accuracy of the fitting groove 8, the mounting accuracy of the connecting core 4 is increased.

FIG. 5 shows a structure in which the connecting core 4 is attached by opening the fitting hole 15 instead of the fitting groove 8 as described above, (1) is a simple steel pipe 5, and (2) is a flange. 14
Are provided, and all are fixed with an adhesive 9. (3) is a precast concrete column 17
The connection core 4 is attached with an adhesive 9, and is used after opening a fitting hole 15.

FIG. 6 shows a reinforcing method according to the second embodiment. The same portions as those in the first embodiment are denoted by the same reference numerals, and only the different portions are denoted by different reference numerals.
In this reinforcing method, in addition to the opposing surfaces of the upper and lower beams 2, the connecting cores 4 are provided on the opposing surfaces of the left and right columns 1 in the same manner as described above.
The horizontal bars 11 of the wall are arranged over these connecting bars 6. The horizontal streaks 11 are also double bars arranged inside and outside the wall, but can be easily arranged, and the connecting core 4 and the connecting streaks 6 are connected over the joint between the earthquake-resistant wall 13 and the column 1. Because of the arrangement, the bonding here is also strong. 4 and 5 can be used as the connection core 4, and in the case of the connection core 4 of FIG. 5, a fitting hole 15 is opened. Although the wall is a double muscle, the wall is not limited to the double muscle and may be a single muscle.

[0017]

According to the present invention, since connecting bars are provided on the opposing surfaces of the upper and lower beams or the left and right columns by the connecting cores, it is not necessary to provide holes for fixing the connecting bars.

Since the fitting groove of the connecting core is opened by a core drill from above the finishing mortar of the beam or the column, generation of noise, vibration, dust and the like can be prevented.

The connecting core of the tube or precast concrete column buried between the joints of the wall and the beam or column provides great resistance to out-of-plane and in-plane forces, while providing the wall and beam. Or the joint of the column becomes strong.

The connection core can be easily installed on the opposing surface of the beam or the column by the flange, and the connection core can be mounted in a well-balanced and stable manner.

[Brief description of the drawings]

FIG. 1 is a front view showing a reinforcing method according to a first embodiment.

FIG. 2 (1) is a perspective view of a connection core, and (2) to (4).
FIG. 4 is a cross-sectional view illustrating a method of attaching a connection core.

FIG. 3 is a sectional view of a shear wall constructed by the method of the present invention.

4A is a perspective view of a connection core, and FIG. 4B is a cross-sectional view illustrating a method of attaching the connection core.

FIGS. 5A to 5C are cross-sectional views illustrating a method of attaching a connection core.

FIG. 6 is a front view illustrating a reinforcing method according to a second embodiment.

FIG. 7A is a sectional view of a shear wall constructed by a conventional method, and FIG. 7B is a front view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1,19 pillar 2,20 beam 3,21 space 4 connection core 5 steel pipe 6,22 connecting bar 7 finishing material 8 fitting groove 9 adhesive 10 vertical bar 11 horizontal bar 13 earthquake-resistant wall 14 flange 15 fitting hole 16 mortar 17 Precast concrete column 23 Reinforcing bar 24 Finishing mortar

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norikatsu Sato 1-21-11 Shinjuku, Chuo-ku, Chiba-shi, Chiba Toda Construction Co., Ltd. Chiba Branch (72) Inventor Toyoto Arai 1-7 Kyobashi, Chuo-ku, Tokyo -1 Inside Toda Construction Co., Ltd. (72) Inventor Risuke Nakahara 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Tomoji Itaga 1-7-, Kyobashi, Chuo-ku, Tokyo 1 Toda Construction Co., Ltd. (72) Inventor Shigeru Nakamura 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Akihiro Miwa 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Shigeichi Yamauchi 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Shigemi Kikuta 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. ( 72) Inventor Shigemi Ei, Chuo-ku, Tokyo Kyobashi 1-7-1 Toda Co., Ltd., Tokyo Branch in the F-term (reference) 2E176 AA01 BB28

Claims (5)

[Claims] 1. A connecting core having connecting bars projecting from at least one facing surface in a space surrounded by columns and beams of an existing building, and reinforcing bars are arranged over these facing connecting bars. A seismic retrofitting method for existing buildings characterized by building walls. 2. The method according to claim 1, wherein the connecting core is fitted in a fitting groove provided in the facing surface. 3. The method according to claim 1, wherein the connecting core is a pipe or a precast concrete column. 4. The method according to claim 1, wherein a flange is formed on an outer periphery of the connecting core. 5. The existing building according to claim 3, wherein a falling-off prevention pin is provided at a lower end of the tube of the connecting core so that both ends are pushed outward. Seismic reinforcement method.