JP3051071B2 - Seismic retrofitting method for existing buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional seismic retrofitting method for an existing building is based on a method in which reinforcing members are connected to inner surfaces of left and right pillars, a lower surface of an upper beam, and an upper surface of a lower beam, respectively. A braced construction method with a steel frame that strengthens the body was adopted. However, since sashes for window glass and doorways are usually installed between the left and right pillars, it is necessary to remove them once and re-install them after construction, which may cause inconvenience to residents. It is a renovation work.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a seismic retrofitting method for an existing building which requires no sash removal and reattachment, eliminates renovation work from inside the building, and can be performed by work from outside the building. It is.

[0004]

SUMMARY OF THE INVENTION The present invention for this purpose is to reinforce the existing buildings, steel pillar body by fixing the steel sheet at intervals to each outward surface portion of the cylindrical body and Haritai the outer wall And the steel plate of the beam body are connected vertically and horizontally, and furthermore, the intermediary reinforcement is connected between the steel plates of the column or between the steel plates of the beam or between the steel plates of the column and the beam, respectively, and the concrete formwork surrounding the steel plate is formed. By installing concrete, the reinforcing columns and beams of concrete containing steel plate are integrally connected to the outward surfaces of the columns and beams, and the columns and beams are further reinforced by interposed reinforcing members. This is a seismic retrofitting method for existing buildings. The steel plate may be fixed to the column and the beam with an anchor bolt, and the periphery of the steel plate may be arranged with hoop bars. Further, the intervening reinforcing body may be a concrete precast body in which a steel plate protrudes from the connection side of both ends, or the intervening reinforcing body may be an H-shaped steel or a steel pipe.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. FIG. 1 is a front view after the third floor is reinforced, and a steel plate as a steel material is arranged as shown in FIG. First, as shown in FIG. 3, an anchor bolt 10 is inserted from the outside into the perforated portion Aa and fixed to the outwardly facing surface of the existing column A on the outer wall side, and a long column steel plate 1 is attached to the protruding end side of the anchor bolt 10. Is sandwiched between the nuts 11 from both sides. As a result, the column steel plate 1 is held at the outward portion of the existing column A at a distance from the outer surface.

Similarly, as shown in FIG. 4, an anchor bolt 20 is inserted from the outside into a perforated portion and fixed to the outwardly facing surface portion of the existing beam B on the outer wall side. The steel plate 2 for beams is sandwiched by nuts 21 from both sides. Thereby, the steel plate 2 for beams is held at the outward portion of the existing beam body B at an interval from the outer surface portion.

[0007] The column steel plate 1 and the beam steel plate 2 held by the existing pillars A and the existing beams B are butt-welded on each floor or several floors or all of the existing columns A and B, and are held vertically and horizontally continuously as shown in FIG. It is. The hoop bars 14 and 24 are connected to the column steel plate 1 and the beam steel plate 2 in advance. Further, the column steel plate 1 and the beam steel plate 2 welded in advance may be held by the existing column A and the existing beam B.

Further, trapezoidal mounting steel plates 13 and 23 are interposed at the position of the column steel plate 1 at the base of the existing column A on each floor and at the center of the beam steel plate 2, and the width of the mounting steel plate 13 is reduced. The oblique side portion 130 is protruded to the side while being widened, and the mounting steel plate 23 is raised and mounted in reverse, so that the oblique side portion 230 is protruded downward.

Reference numeral 3 denotes a slanted interposed reinforcing member, as shown in FIG. 6, which is a concrete precast body in which the reinforcing steel plate 31 is covered with concrete except for both ends, and the reinforcing steel plate 31 projecting from both ends is connected to the connecting portion 310. And Then, one end of the connecting portion 310 is butt-welded to the oblique side portion 230 of the mounting steel plate 23, and the other end of the connecting portion 310 is butt-welded to the oblique side portion 130 of the mounting steel plate 13 as shown in FIG. As shown in FIGS. 4 and 5, the oblique interposition reinforcing member 3 is connected between the steel plate 1 for a column and the steel plate 2 for a beam.

In this state, the steel plates 1 and 2 are surrounded and closed between the column A and the beam B, and the concrete surrounding the connection portion 310 of the reinforcing steel plate 31 protruding from the end of the oblique interposition reinforcing member 3. The formwork is assembled and concrete is poured into the formwork. As a result, as shown in FIGS. 8 and 9, the reinforcing columns C and the reinforcing beams D made of steel plate-containing concrete are integrally connected to the outward surfaces of the column A and the beam B.

As described above, according to this embodiment, the reinforcing column C and the reinforcing beam D are continuously provided on the outer surface side of the existing column A and the beam B, so that the column A and the beam B are reinforced. In addition, the reinforcing column portion C and the reinforcing beam portion D are connected to each other to form a frame, and furthermore, the oblique interposition of the reinforcing body 3 further reinforces the structure to provide a strong and rigid earthquake-resistant reinforcing structure. In addition, since the reinforcing column C and the reinforcing beam D are connected to the outer surface of the existing column A and beam B, the sash between the columns A can be left as it is. It becomes.

Although the present embodiment employs the above-described method, the present invention is not limited to this method. For example, a steel material that is fixed to the outer surface of the pillar and beam on the outer wall side with a space between them
The fixing means is appropriate. The means for connecting the steel material held by the column and the steel material held by the beam is not limited, and may be bolted as shown in FIG. 10 in addition to welding.

Further, a steel pipe such as an H-shaped steel or a square steel pipe may be used irrespective of the configuration of the intervening reinforcing body. In this case, H
What is necessary is just to attach a connection member to a steel material so that a model steel or a steel pipe may be easily connected. The mounting state of the interposition reinforcing member is arbitrary, and can be variously interposed in consideration of the arrangement of the door and the like as shown in FIG. That is, it is possible to interpose and connect between the steel plates of the column or between the steel plates of the beam or between the steel of the column and the beam. Further, as shown in FIG. 12, in order to connect by welding when the trapezoidal mounting steel plates 13 and 23 are unnecessary, as shown in FIG. 12, as shown in FIG. I just need.

[0014]

According to the first aspect of the present invention, the reinforcing column and the reinforcing beam having a steel plate are integrally provided on the outer surface side of the existing column and beam so as to be integrally connected to the frame. The beam body is reinforced, and an intervening reinforcing body is interposed to provide a stronger and more rigid seismic reinforced structure. The repair work from the inside of the building is not required because the work can be done as it is.

According to the second aspect of the present invention, the steel plate is firmly fixed to the column and the beam, and the hoop reinforces the reinforcing column and the beam with high strength. According to the third aspect, the construction can be performed quickly because of the intervening reinforcing body made of the concrete precast body. In the fourth aspect, the strong intervening reinforcing body can be quickly attached.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view of a reinforcing portion constructed in an embodiment of the method of the present invention.

FIG. 2 is a front view showing an arrangement state of the steel plate and the intervening reinforcing body.

FIG. 3 is a cross-sectional view showing fixation of a steel plate.

FIG. 4 is a longitudinal sectional side view in which a steel plate and an intervening reinforcing body are connected.

FIG. 5 is a cross-sectional plan view in which a steel plate and an intervening reinforcing body are connected.

FIG. 6 is a perspective view of the interposition reinforcing member.

FIG. 7 is an enlarged perspective view showing a connecting portion between the steel plate and the interposition reinforcing member.

FIG. 8 is a cross-sectional plan view after the concrete is cast.

FIG. 9 is a vertical cross-sectional side view after concrete is cast.

FIG. 10 is an enlarged perspective view showing another example connecting portion of a steel plate and an intervening reinforcing body.

FIG. 11 is a front view showing another connection state of the intervening reinforcing body.

FIG. 12 is a front view showing a connection state of still another example of the interposition reinforcing member.

[Explanation of symbols]

 Reference Signs List A Existing column B Existing beam C Reinforcement column D Reinforcement beam 1 Column steel plate 2 Beam steel plate 10, 20 Anchor bolt 13, 23 Mounting steel plate 130, 230 Oblique part 14, 24 Hoop streak 3 Slope interposition reinforcement 31 Reinforced steel plate 310 Connecting part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 23/02

Claims (4)

(57) [Claims] 1. A is intended to reinforce the existing building, connecting the steel of the steel sheet and Haritai pillar member in the vertical and horizontal directions by fixing the steel sheet at intervals to each outward surface portion of the cylindrical body and Haritai the outer wall by arrangement, and further connects the intervening reinforcement between the steel sheet or between pillar and Haritai each steel sheet steel or between Haritai pillar body, to set concrete comprises a concrete form which surrounds the steel pillars The existing building is characterized in that the reinforcing columns and the reinforcing beams made of steel sheet concrete are integrally connected to the outward surface of the body and the beam, and the columns and beams are further reinforced by the interposed reinforcing members. Seismic reinforcement method. 2. The seismic retrofitting method according to claim 1, wherein the steel plate is fixed to the column and the beam with anchor bolts, and the periphery of the steel plate is arranged with hoop bars. 3. A precast concrete body in which a steel plate protrudes from the connecting side of both ends of the intervening reinforcing body.
Or the earthquake-resistant reinforcement method of claim 2. 4. The seismic retrofitting method according to claim 1, wherein the intervening reinforcing member is an H-shaped steel or a steel pipe.