JP3020021B2 - Building seismic retrofitting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a building, for example, to compensate for the lack of earthquake resistance of an existing building.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing the seismic resistance of an existing building, a conventional construction method has been adopted in which an earthquake-resistant wall is constructed between a column and a beam frame by being cast in place, or a steel plate is built around an existing reinforced concrete column. , A steel plate wrapping method that integrates this by welding, a FRP wrapping method that wraps a fiber-reinforced material consisting of high-tensile fiber such as glass fiber or carbon fiber on the surface of an existing reinforced concrete column, or a steel frame brace between frames There is a construction method to insert.

[0003] Among them, the method of constructing the earthquake-resistant wall is as follows.
After placing reinforcing bars between the frames and installing the formwork, cast-in-place concrete is cast.

[0004]

The construction method for adding an earthquake-resistant wall is a wet construction method for casting cast-in-place concrete, and it is necessary to secure the time required for rebar work and concrete placement and for the curing period of concrete hardening. It requires labor and time, and requires a large work space, so it is difficult to work in an office building or the like while working, and the function of the office building is impaired during construction. It is.

[0005] In addition, the construction method of inserting a steel brace into a frame requires a heavy equipment for work due to an increase in the weight of members constituting the brace, and as a result, it is necessary to occupy a building exclusively for work. Noise and vibration are also generated, and the function as an office building is lost during construction.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to easily and quickly perform construction without requiring a large-sized work machine in a building. It is an object of the present invention to provide a seismic retrofitting method for a building that is unnecessary, does not generate noise or vibration, and can be reinforced while working.

[0007]

In order to achieve the above object, the present invention firstly lays a precast concrete plate using lightweight concrete as a member which can be carried by human power between frames of a building. In addition, this precast concrete board is built so that the ends are fixed to the mounting hardware fixed to the frame of the building, a plurality of pieces are bonded together in the thickness direction and connected in the width direction to form a reinforcing wall, At that time, in the cotter recess formed in these precast concrete plates, a reinforcing bar for fixing the ends to the mounting hardware and connecting the reinforcing wall and the building frame is built in, and the precast concrete plates connected adjacently are connected. The main point is to incorporate a reinforcing bar for connection with the grout and to fill the recess with a grout material.

Secondly, the precast concrete plate has wall reinforcements embedded therein, and the reinforcements fixed to the mounting hardware provided in the recesses are reinforcement reinforcements for bending reinforcement and shear displacement reinforcement as anchor reinforcements. Forming recesses for arranging reinforcement in the longitudinal length direction on both sides and the middle part as appropriate,
Further, the present invention is characterized in that a plurality of recesses for arranging reinforcing bars for connection with the precast concrete plate are formed on one side at appropriate intervals in the lateral length direction.

Thirdly, the metal fittings are provided with reinforcing metal fittings for anchor reinforcements on the front and rear surfaces of the plate-shaped main body, and have bolt holes for fixing the precast concrete plate. Fourth, the precast concrete plate has a high height at the lower part. Fifth, the precast concrete plate is provided with an anchor reinforcing bar temporary fixing member in a recess for anchor reinforcing bar reinforcement.

According to the first aspect of the present invention, it is only necessary to carry in the precast concrete plate to the site and to build it.
There is no noise or vibration, and it can be constructed by the dry method like the construction of the moving partition wall.

The precast concrete plate can be easily attached to the building frame by attaching it to the mounting fixture fixed to the building frame in the thickness direction and connecting it in the width direction and fixing it. Since the adjacent precast concrete plates are connected by the connecting rebar, the precast concrete plates can be easily connected to each other. Further, the strength of the reinforcing wall formed by laminating the precast concrete plates increases because the reinforcing wall is joined in the thickness direction.

According to the second aspect of the present invention, the precast concrete plate is a precast reinforced concrete plate having a built-in wall reinforcement, and the anchor reinforcement disposed in the cotter recess provided in the precast concrete plate is the same as the above. Sufficient strength can be obtained as a reinforcing wall by connecting the reinforcing wall and the building frame to form a reinforcing bar for bending reinforcement and shear displacement reinforcement. Further, since the precast concrete plates are also connected to each other by the connecting rebar, sufficient strength can be secured as the whole reinforcing wall.

According to the third aspect of the present invention, in addition to the above-mentioned operation, the mounting hardware is provided with mounting hardware of an anchor reinforcing bar on the front and rear surfaces of the plate-shaped main body, and the anchor reinforcing bar is fixed to the mounting hardware. Therefore, it is possible to prevent the post-installation anchor being directly driven into the building frame such as a beam and connecting the anchor rebar to the post-installation anchor, thereby preventing the post-installation anchor from being densely packed. Further, since the mounting hardware has bolt holes for fixing the precast concrete plate, it is easy to temporarily fix the precast concrete plate to the mounting hardware.

According to the fourth aspect of the present invention, in addition to the above operation, a level adjusting bolt provided on the floor slab is screwed into a height adjusting embedded nut provided at a lower portion of the precast concrete plate. Therefore, the height of the mounting position of the precast concrete plate can be easily adjusted.

According to the fifth aspect of the present invention, in addition to the above-mentioned operation, the precast concrete plate is provided with the anchor reinforcing member temporary fixing member in the concave portion for anchor reinforcing bar reinforcement. Workability is improved when arranging between anchors and arranging anchor rebars in recesses or adjusting the height of precast concrete plates.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view of a reinforcing wall on which a seismic retrofitting method for a building according to the present invention is performed, and FIG. 2 is a perspective view of a precast concrete plate constituting the reinforcing wall.
First, the structure of the precast concrete plate 1 will be described. Lightweight concrete having a specific gravity of about 1.0 to 1.5 is used, and is divided into a size that can be easily transported by manpower and other work. .

In the present embodiment, the precast concrete plate 1 has a wall reinforcement 2 as a shear reinforcement, and a cotter recess is formed on the joint surface 1a side. This recess is
On both sides formed along the vertical length direction of the precast concrete plate 1, a concave portion 3a for reinforcing bar reinforcement described later,
It is appropriately formed so as to communicate with the concave portion 3b, which is formed in the middle of the concave portions 3a on both sides, and is shorter than the concave portion 3a for the anchor bar, and along one side in the longitudinal direction of the precast concrete plate 1 with the concave portion 3a. A plurality of precast concrete plates 1 to be described later, which are formed in the short direction at intervals, are provided with concave portions 3c for arranging connecting bars.

The precast concrete plate 1
A bolt hole 4 for coupling with another precast concrete plate 1 to be superimposed is formed over almost the entire surface, and further, a step 5 for coupling with a mounting hardware described later is formed at an end in the horizontal length direction, The step 5 is provided with a bolt hole 15 for fixing to a mounting hardware.

Further, at the lower end of the precast concrete plate 1, a buried nut 11 for height adjustment is incorporated as shown in FIG. 3, and as shown in FIG. A clip 12 is provided.

FIGS. 5 to 7 show mounting hardware 16 for fixing the precast concrete plate 1 to the building frame. The front and rear surfaces of the vertical portion 6a of the plate-shaped main body 6 having a T-shaped cross section are provided with the anchor reinforcing bars. In accordance with 3a and 3b, a reinforcing metal fitting 7 of the anchor reinforcing bar is attached by welding with a screw coupler or the like, and a bolt hole 8 for temporarily fixing the precast concrete plate 1 is formed in correspondence with the fixing bolt hole 15. It is formed in a long hole shape.

A bolt hole 10 for screwing an anchor bolt 9 for fixing to a building frame is provided in the horizontal portion 6b of the plate-shaped main body 6.
Have been drilled.

The precast concrete plate 1 is built between columns 6 and beams 7 which are building frameworks. The method of this building will be described with reference to FIGS. First, as shown in FIG. 8, the horizontal portion 6b of the mounting hardware 16 is brought into contact with the beam 13 and the floor slab 14, and the anchor bolt 9 is screwed into the bolt hole 10, and the mounting hardware 16 is fastened with the anchor bolt 9 and the adhesive. Is fixed to the beam 13 and the floor slab 14.

Next, the end of the anchor reinforcing bar 17 is fixed to the reinforcing bar mounting member 7 provided on the vertical portion 6a of the mounting bracket 16 (see FIG. 9), and the back surface of the precast concrete plate 1 on the back side is fixed to the vertical portion 6a. Is placed between the beam 13 and the floor slab 14 in contact with the rear side of the floor, and the bolt holes 15 and 8 are aligned with each other.
Temporarily fix to 16.

At this time, as shown in FIG.
The anchoring bar 17 fixed to the recesses enters the recesses 3a and 3b for arranging the anchoring bars, and the recesses 3a and 3b
It is temporarily fixed with the clip 12 provided in b.

As shown in FIG. 3, ordinary bolts 18 are attached to the floor slab 14 as adjustment bolts, and the bolts 18 are screwed into the precast concrete plate 1 in advance to the embedded nuts 11 provided therein, whereby the precast concrete Adjust the built-in height of the board 1. At this time, the bolt hole 8 is formed in a vertically elongated shape while the precast concrete plate 1 is temporarily fixed to the mounting hardware 16, so that the precast concrete plate 1 can be freely moved up and down.

Next, the connecting bars are inserted into the concave portions 3c for connecting the connecting bars.
19 are laid out, and the end is projected to the side of the adjacent precast concrete plate 1 to be erected next.

Finally, the precast concrete plate 1 is laid on the joint surface 1a of the precast concrete plate 1 on the back side thus built, and the precast concrete plate 1 is similarly built on the front surface side. A bolt is inserted into the bolt hole 4 of the plate 1 to fasten the two together, and the recesses 3a, 3b, 3c are filled with a grout material 22 such as a high-strength grout mortar.

As described above, the anchor rebar 17 and the wall rebar 2
Is formed, and a next reinforcing wall 20 is constructed adjacent to the reinforcing wall 20 by the same method. At that time, the connecting bars 19 arrange reinforcing members protruding from the reinforcing wall 20 constructed before in the cotter recess 3c for connecting bars of the reinforcing wall 20 to be constructed, and connect the adjacent reinforcing walls 20 to each other. To join.

As a result, as shown in FIG. 12, a plurality of reinforcing walls 20 are erected between the beams 13, the floor slabs 14 and the columns 21, which are frames of the building frame, and the gaps between the beams 13, the floor slabs 14 and the columns 21 are provided. Filling the grout 22 also builds a seismic reinforced wall.

By selecting the method of joining the precast concrete plates 1 to each other and selecting the width of the plates, a plurality of reinforcing walls 20 lined up can be formed by a known slit type earthquake-resistant wall (Japanese Patent Publication No. 45-24104, Japanese Patent Publication No. 48-11135). Japanese Patent Application Laid-Open Publication No. HEI 9-205), it is also possible to use a ductile wall in which the rigidity of the reinforcing member can be arbitrarily changed.

In the above-described embodiment, the mounting hardware 16 is formed as a long object. However, the present invention is not limited to this. As another example, as shown in FIGS. It is also possible to use a plurality of such precast concrete plates by arranging them at appropriate intervals.

[0032]

As described above, the seismic retrofitting method for a building according to the present invention firstly requires that a precast concrete plate divided enough to be transported by manpower only needs to be carried into the site and built therein. There is no need to cast, no noise or vibration is generated, and it can be constructed by the dry method like construction of moving partition walls, and it can be done easily and quickly without the need for large work machines in the building You can do it.

Further, in the construction of an existing building, a large work space is not required, no noise or vibration is generated, and the reinforcement work can be performed in the working state.

The precast concrete plate can be easily attached to the building frame by attaching it to the mounting fixture fixed to the building frame in the thickness direction and connecting it in the width direction and fixing it. Since the adjacent precast concrete plates are connected by the connecting rebar, the precast concrete plates can be easily connected to each other. Further, the strength of the reinforcing wall formed by laminating the precast concrete plates increases because the reinforcing wall is joined in the thickness direction.

Second, the precast concrete board is
Precast reinforced concrete plate with built-in wall reinforcement.Anchor reinforcement placed in the cotter recess provided in the precast concrete plate is connected to the reinforcing wall and the building frame to provide bending reinforcement and shear displacement reinforcement. By using the streaks, sufficient strength can be obtained as a reinforcing wall. In addition, since the precast concrete plates are also connected to each other by the connecting reinforcing bar, sufficient strength can be secured as the whole reinforcing wall.

Third, the mounting hardware is provided with mounting hardware for anchoring reinforcement on the front and rear surfaces of the plate-shaped main body, and the anchoring reinforcement is fixed to the mounting hardware. Therefore, it is possible to prevent the post-installation anchor from being densely mounted on the beam or the like, as in the case where the post-installation anchor is directly driven into the building frame such as a beam and the anchor rebar is connected thereto. Further, since the mounting hardware has bolt holes for fixing the precast concrete plate, it is easy to temporarily fix the precast concrete plate to the mounting hardware.

Fourth, the height of the mounting position of the precast concrete plate can be adjusted by screwing a level adjusting bolt provided on the floor slab to the embedded knit for height adjustment provided at the lower part of the precast concrete plate. Easy to do.

Fifth, since the precast concrete plate has a temporary anchoring member provided in the concave portion for the reinforcing bar reinforcement, the precast concrete plate is laid between the frames of the building frame, and the anchor reinforcing bar is inserted into the concave portion. Workability is improved when arranging reinforcing bars or adjusting the height of the precast concrete plate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a reinforcing wall on which an earthquake-resistant reinforcing method for an existing building of the present invention is performed.

FIG. 2 is a perspective view of a precast concrete plate constituting a reinforcing wall.

FIG. 3 is a front view of a lower portion of a precast concrete plate constituting a reinforcing wall.

FIG. 4 is a cross-sectional plan view of a main part of a precast concrete plate constituting a reinforcing wall.

FIG. 5 is a front view of a mounting hardware on which the seismic retrofitting method for an existing building of the present invention is implemented.

FIG. 6 is a bottom view of a fitting for implementing the seismic retrofitting method for an existing building according to the present invention.

FIG. 7 is a side view of the mounting hardware on which the seismic retrofitting method for an existing building of the present invention is implemented.

FIG. 8 is a front view showing a first step of the seismic retrofitting method for an existing building according to the present invention.

FIG. 9 is a front view showing a second step of the seismic retrofitting method for an existing building according to the present invention.

FIG. 10 is a front view showing a third step of the seismic retrofitting method for an existing building according to the present invention.

FIG. 11 is a front view showing a fourth step of the seismic retrofitting method for an existing building of the present invention.

FIG. 12 is a front view showing an example of a seismic reinforced wall of an existing building according to the seismic reinforced construction method of the present invention.

FIG. 13 is a front view of another example of the mounting hardware in which the seismic retrofitting method for an existing building of the present invention is implemented.

FIG. 14 is a bottom view of another example of the mounting hardware on which the seismic retrofitting method for an existing building of the present invention is implemented.

FIG. 15 is a side view of another example of the mounting hardware in which the seismic retrofitting method for an existing building of the present invention is implemented.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Precast concrete board 1a ... Joining surface 2 ... Wall reinforcement 3a, 3b, 3c ... Concave part 4 ... Bolt hole 5 ... Step part 6 ... Main body 6a ... Vertical part 6b ... Horizontal part 7 ... Rebar mounting hardware 8 ... Bolt hole 9 ... Anchor bolts 10… Bolt holes 11… Embedded nuts 12… Clips 13… Beams 14… Floor slabs 15… Bolt holes 16… Mounting hardware 17… Anchor bars 18… Normal bolts 19… Connecting bars 20… Reinforcing walls 21… Columns 22… Grout Lumber

──────────────────────────────────────────────────の Continuing from the front page (72) Hiroki Kazumi, Inventor 2-9-1, Tobita-Ki, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Mikao Kobayashi, 2-19, Tobi-Kita Tobita, Chofu-shi, Tokyo No. 1 Kashima Corporation Co., Ltd. Technical Research Institute (56) References JP-A-5-340008 (JP, A) JINKO 4-26568 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) E04G 23/02 E04B 2/56-2/56 605

Claims (5)

(57) [Claims] [Claim 1] A precast concrete plate made of lightweight concrete is erected between buildings of a building so as to be divided so as to be carried by human power. Are fixed to each other and bonded together in the thickness direction and connected together in the width direction to form a reinforcing wall. At this time, the mounting is performed in a cotter recess formed in these precast concrete plates. In addition to incorporating a reinforcing bar for fixing the end to the hardware and connecting the reinforcing wall and the building frame, a reinforcing bar for connection with a precast concrete plate to be connected adjacently is built in, and grout material is placed in the recess. A seismic retrofitting method for buildings characterized by filling. 2. The precast concrete plate has wall reinforcements embedded therein, and the reinforcements fixed to the mounting hardware provided in the recesses are reinforcement reinforcements for bending reinforcement and shear displacement reinforcement as anchor reinforcements. Formed in the vertical length direction on both sides and an appropriate length in the middle thereof,
2. A method according to claim 1, wherein a plurality of recesses for arranging reinforcing bars for connection with the precast concrete plate are formed on one side at appropriate intervals in the lateral length direction. 3. The seismic retrofitting method for a building according to claim 1, wherein the metal fittings are provided with metal reinforcing metal fittings of anchor reinforcing bars on the front and rear surfaces of the plate-shaped main body and have bolt holes for fixing a precast concrete plate. 4. The method according to claim 1, wherein the precast concrete plate has a buried nut at a lower portion for height adjustment. 5. The seismic retrofitting method for a building according to claim 1, wherein said precast concrete plate is provided with a member for temporarily anchoring said reinforcing bar in a recess for reinforcing said reinforcing bar.