JP3229231B2 - Building seismic reinforcement structure - 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 reinforcement structure applied to an existing building.

[0002]

2. Description of the Related Art Conventionally, cast-in-place concrete walls have been added to a space defined by a pair of columns facing each other and a beam and a slab connected to the columns for the purpose of seismic reinforcement of an existing building. ing.

[0003] Existing buildings are used as dwellings and offices. Therefore, it is desirable that the construction period required for seismic retrofitting work, which restricts the use of buildings, be short. However, the conventional seismic reinforcement requires time-consuming operations such as assembling the formwork, compacting the cast concrete, and removing the formwork. In addition, concrete placement space is pillar,
Since it is surrounded by beams and slabs, it is necessary to provide an opening at the top of the formwork or make a hole in the slab as a concrete pouring port, and as a post-treatment of the concrete pouring port, It was necessary to finish fishing and mortar, fill the slab with holes, and the like. From these facts, there is a limit to shortening the construction period, and these works required a great deal of labor for seismic reinforcement.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to shorten the construction period of an earthquake-resistant reinforcement of a building by adding walls. Another object of the present invention is to reduce the labor required for such seismic reinforcement.

[0005]

According to the present invention, there is provided a seismic retrofit structure comprising a plurality of pairs of columns which are arranged in a space defined by a pair of columns facing each other in an existing building and beams and slabs connected to the columns . Including precast concrete boards.
Each pair of precast concrete plates is fastened together via fastening means. A reinforcing bar and a plurality of splitting preventing bars are arranged between these precast concrete plates, and are filled with mortar. The reinforcing bar overlaps with a plurality of implanted reinforcing bars implanted in both columns, the beam, and the slab. The plurality
The anti-cracking rebar runs along both columns, the beam and the slab.
Each is growing.

[0006] Another precast concrete plate may be further arranged between the two precast concrete plates. In this case, a reinforcing reinforcing bar and a plurality of splitting preventing reinforcing bars are arranged between the other precast concrete plate and the precast concrete plate.
Each reinforcing bar forms a lap joint with the plurality of implanted reinforcing bars implanted in both columns, the beam, and the slab.

A plurality of pairs of precasts facing each other
A pair of precast concrete plate which are adjacent to each other in the concrete slab, both precast concrete plate
Of both precast concrete boards
At least one pair of loop-shaped reinforcing bars projecting from each side and overlapping each other, and a pair of notches for respectively receiving the two reinforcing bars are provided, and each notch can be filled with the mortar.

[0008]

According to the present invention, a wall to be added to an existing building includes a plurality of pairs of precast concrete plates facing each other, reinforcing reinforcing bars and split bars therebetween.
And a layer of mortar containing a crack preventing reinforcing bar. Alternatively, a plurality of pairs of first precast concrete plates facing each other, a plurality of second precast concrete plates therebetween, and reinforcement between each of the first precast concrete plates and the second precast concrete plate It is composed of a reinforcing bar and a mortar layer including a split preventing reinforcing bar . The second precast concrete slab makes it possible to obtain thicker walls with less mortar injection.

The mortar layer of the wall is in close contact with the precast concrete plate, and each pair of precast concrete plates facing each other is fastened to each other via fastening means. Is secured. In the case of the wall body including the second precast concrete plate, the integrity of the second precast concrete plate, the mortar layer, and each of the first precast concrete plates is ensured. Further, the reinforcing bar forms a lap joint with a plurality of implanted reinforcing bars provided on both columns, beams and slabs, and these joints are buried in the mortar. And the integrity of the system. Further, the wall has a required mechanical strength as a part of the structure by each precast concrete plate and the reinforcing steel in the mortar layer. For these reasons, the wall can fulfill a sufficient seismic reinforcement function for the building.

Further, since the precast concrete plate forming a part of the seismic retrofitting structure also has a function of a mold for defining a filling space of the mortar, a conventional mold for assembling and removing the mold is used. There is no need for work, setting work for the concrete pouring opening, and subsequent work, and the mortar having high fluidity does not require compacting work for the cast concrete. For this reason, the seismic reinforcement of the building can be completed in a shorter construction period and with less labor than before.

Further, a pair of adjacent precast concrete plates are buried in the mortar with a plurality of pairs of loop-shaped reinforcing bars which are embedded in advance and overlap each other, thereby firmly connecting the two precast concrete plates to each other. These can be integrated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1, 2 and 3, the seismic retrofit structure according to the present invention is applied to an existing building 10 such as a reinforced concrete structure, a steel reinforced concrete structure or the like. Then, a new wall 12 (FIG. 3) is added.

In order to apply the above-mentioned seismic retrofit structure, a pair of columns 1 facing each other at an arbitrary level of the building 10 is previously determined.
4, a plurality of rebars 20 (see FIGS. 1 and 2) are implanted in advance in each of the beam 16, the slab 18 (FIG. 2).

These implanted reinforcing bars 20 extend horizontally from the columns 14 having a rectangular cross section toward each other in the horizontal direction, and extend from the beam 16 and the slab 18 toward each other. I have.

The seismic retrofit structure includes a plurality of pairs (four pairs in the illustrated example) of a first precast concrete plate (hereinafter, referred to as a “PC plate”) 22 and a plurality of second plates.
(Hereinafter referred to as “PC board”) 24, a plurality of reinforcing bars 26, and two mortar layers 28 reinforced by the reinforcing bars (see FIG. 3).
Each of the PC boards 22 and 24 is reinforced with a reinforcing bar.

A plurality of pairs of first PC boards 22 are arranged opposite to each other and spaced from each other, that is, arranged in two rows. A pair of adjacent first PC boards 22 in each row are in contact with each other on their sides. Alternatively, the first PC boards 22 adjacent to each other can be arranged at a slight interval between the pair of first PC boards 22. In this case, a sealing material such as urethane foam is arranged to prevent the mortar injected to form the mortar layer 28 from leaking from between the two PC boards 22. Is buried.

The side of the row of the first PC boards 22 is
, Or such that there is a slight gap between the two pillars 14. Both pillars 14 and the first PC
A mortar sealing material is similarly disposed in the gap between the plate 22. Two rows of first PC boards 2 arranged in this manner
2 forms a mortar injection space for forming each mortar layer 28 in cooperation with the pillars 14 and the slab 18. Therefore, according to this, the work required for installing and removing the mold for defining the mortar injection space can be eliminated.

The plurality of second PC boards 24 each have a smaller width dimension and a smaller height dimension than the first PC board 22, and are spaced from each of the building beams 16 and slabs 18, respectively. Also, they are arranged at an interval from each other. Further, the plurality of second PC boards 24 and the first
And the PC board 22 at an interval. Therefore, the second PC board 24, the beam 16 and the slab 18
, Between the second PC boards 24, and between the first and second PC boards 22, 24, and a pair of mortar layers 28 interconnected by the mortar filling these gaps. Are formed.

Each second PC board 24, when placed between beam 16 and slab 18, has a second
4 and means for adjusting the distance between the beam 16 and the slab 18 and supporting each second PC board 24. The support means includes a plurality of studs 30 extending upward and downward from the top and bottom of each second PC board 24, a long nut 32 screwed to each stud 30, and a tip of the long nut 32. It consists of a fixed substrate 34. According to this, by turning the long nut 32, each board 34 is moved from the top or bottom of the second PC board 24.
The distance to can be adjusted. When the second PC board 24 is disposed between the beam 16 and the slab 18, each substrate 34 comes into contact with each of the beam and the slab.

Each of the first PC board 22 and each of the second PC boards 24 are provided with a plurality of holes 36 and a plurality of holes 38 which are aligned with each other. A pair of first Ps facing each other
A bolt 40 passes through a hole 36 of the C plate 22 and a hole 38 of the second PC 24 plate therebetween, through a rectangular opening of a wire mesh which will be described later as the reinforcing reinforcing bar 26. A nut 42 (FIG. 3) is screwed into the tip of each bolt 40. Both first PC boards 22 are provided with bolts 40 as fastening means.
And the nut 42 are fastened to each other.

Preferably, recesses 44 and 46 are provided on the surfaces of both first PC boards 22 to open respectively. One recess 44 can receive the head of the bolt 40,
The other concave portion 46 is provided between the end of the bolt 40 and the nut 42.
And can accept.

The pair of first PC boards 22 adjacent to each other in each row have a plurality of pairs of loop-shaped reinforcing bars 48 and 50 which are arranged at intervals in the vertical direction and overlap each other. One loop-shaped reinforcing bar 48 of each pair protrudes from one of both opposing side portions of both first PC boards 22 through a notch 49 provided on the side portion, and the other loop-shaped reinforcing bar 50 has , Protruding from the other of the two opposing sides of the first PC board 22 through the notch 51 provided on the side, and the two loop-shaped reinforcing bars 48, 50 are received by the other one of the notches. Have been. The notches 49 and 51 are open to the side and the back surface (the surface facing the second PC board 24) of each PC board 22. When the side parts of both PC boards 22 are in contact with each other, both PCs 22 A recess 52 (FIG. 3) that is open only on the back of the plate 22 is defined.

The loop-shaped reinforcing bars 48 and 50 are respectively
Each of the first PC boards 22 forms a part of a wire mesh (not shown) which is a reinforcing reinforcing bar embedded in the first PC board 22. The inside of each recess 52 is filled with the solidified material of the mortar which forms a part of each mortar layer 28, and the two loop reinforcing bars 48 and 50 overlapping each other in each recess 52 are mutually connected via the solidified material of the mortar. Are linked. As a result, both the first
PC boards 22 are firmly connected, and a plurality of first P
The integrity of the C plate 22 is maintained.

The reinforcing bars 26 disposed between the first PC board 22 and the second PC board 24 are made of wire mesh. Both wire meshes are parallel to each other and to these PC boards 22,24. These wire meshes
Each has substantially the same size as the plane defined by the plurality of first PC boards 22 in each row, and the ends of the vertical and horizontal reinforcing bars of each wire mesh overlap with the implanted reinforcing bars 20 in the vertical plane. ing.

Therefore, the two wire meshes are connected to the two columns 14, the beams 16 and the slab 18 via the solidified mortar forming the two mortar layers 28, whereby the mortar layer 28 and the mortar layer 28 are integrated. Is ensured. Prior to the installation of the wire mesh , a plurality of split-prevention reinforcing bars 54 extending spirally along the columns 14, the beams 16 and the slab 18 are arranged. Reinforcing bar 26
Can be placed after the second PC board 24 is placed and before the first PC board 22 is placed.

Each mortar layer 28 is composed of both first PC boards 22.
It is formed by injecting mortar in between. The mortar having high fluidity includes a space between the first and second PC boards 22 and 24 where the reinforcing reinforcing bars 26 are arranged, a space between the second PC boards 24, and a second PC board. The space between the beam 24 and the beam 16 and the space between the second PC board 24 and the slab 18 are filled without gaps. In order to increase the adhesive strength between the mortar layer 28 and the first and second PC boards 22 and 24, the surfaces in contact with the mortar, that is, the surfaces of the PC boards 24 facing each other are rough or uneven. Is desirable.

In the illustrated example, a hole 56 for injecting or filling mortar into the space is provided below each first PC board 22. In addition, holes 58 are provided in the upper portions of the first PC boards 22 to release air from the spaces when the mortar is injected into the spaces from the holes 56 at the lower positions.

In the illustrated example, each of the first PC boards 22
Is set to be slightly smaller than the distance between the beam 16 and the slab 18 to facilitate the work of fitting the first PC board. Therefore, there is a slight gap between the beam 16 and each first PC board 22. Code 6
0 indicates leakage of the mortar made of the same material as described above, which is fitted in the gap.

The mortar layers 28 are formed by solidification of the mortar injected, and the seismic retrofit structure of the present invention is obtained. That is, the wall 12 is additionally provided, and the earthquake resistance of the building 10 is increased.

The first and second PC boards 22, 24
Each quantity of is replaced with the example shown in which this is 4
There can be a plurality other than four . With multiple PC boards ,
One large PC because each PC board is small and light
As compared with the case of using a plate, the handling, for example, transportation, erection and the like can be performed easily.

Further, the reinforcing reinforcing bar 26 may be a single reinforcing bar which overlaps with each of the implanted reinforcing bars 20 instead of the wire mesh.

The thickness dimension of the wall 12 to be added is the thickness dimension of the first and second PC boards 22 and 24, and the first P
It can be arbitrarily determined by changing the distance between the C plates 22 and the like.

By omitting the arrangement of the second PC board 24, it is possible to provide a wall having a smaller thickness than the wall 12 shown in the figure.

In this case, a reinforcing bar 26 made of one wire mesh is arranged between the two rows of PC boards 22. Therefore, the plurality of implanted reinforcing bars 20 overlapping with the wire mesh are provided so as to lie in one of the vertical planes.

[Brief description of the drawings]

FIG. 1 is a schematic exploded perspective view of an earthquake-resistant reinforcement structure of the present invention.

FIG. 2 is a longitudinal sectional view of a beam and a slab, showing an implanted reinforcing bar provided before a seismic retrofit structure is constructed.

FIG. 3 is a longitudinal sectional view of the seismic retrofit structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Building 12 Wall 14 Column 16 Beam 18 Slab 20 Implanted reinforcing bar 22, 24 First and second precast concrete plate 26 Reinforcing reinforcing bar 28 Mortar layer 40, 42 Bolt and nut (fastening means) 48, 50 Loop reinforcing bar 52 Concave

Continued on the front page (72) Inventor Kiyoshi Shimakawa 1043, Onigatake, Tsukuba-shi, Ibaraki Pref. In the Kumagaya Gumi Technical Research Institute (72) Inventor Koichi Sato 1043, Onigatakeku-Kaboku, Tsukuba-shi, Ibaraki Co., Ltd. Inside the Technical Research Institute (72) Inventor Junzo Hayashi 1043 Oga Onigakubo, Tsukuba City, Ibaraki Prefecture Inside the Kumagaya Gumi Technical Research Institute (56) References JP-A-58-144663 (JP, A) JP-A-4-237762 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 23/02 E04G 11/00 E04B 2/86

Claims (3)

(57) [Claims] 1. A seismic retrofit structure for an existing building, wherein the structure is disposed in a space defined by a pair of columns facing each other in the building, and a beam and a slab connected to both columns, and fastened to each other via fastening means. A plurality of pairs of precast concrete plates facing each other, and a reinforcing reinforcing bar disposed between the pair of precast concrete plates, wherein the reinforcing bars overlap with the plurality of implanted reinforcing bars implanted in both columns, the beams and the slab. Reinforcing reinforcing bars, a plurality of splitting preventing reinforcing bars arranged between the precast concrete plates, and a plurality of splitting preventing reinforcing bars extending along both columns, the beams and the slab, and filling between the precast concrete plates. Reinforced mortar and seismic reinforcement structure. 2. A seismic retrofit structure for an existing building, wherein the building is disposed in a space defined by a pair of columns facing each other, and a beam and a slab connected to both columns, and are fastened to each other via fastening means. A plurality of pairs of first precast concrete plates facing each other, a plurality of second precast concrete plates disposed between the pair of first precast concrete plates, each first precast concrete plate, and A reinforcing reinforcing bar disposed between the second precast concrete plates, the reinforcing reinforcing bars being overlapped with the plurality of implanted reinforcing bars implanted in both columns, the beams and the slab, and a plurality of reinforcing bars disposed between the precast concrete plates. A plurality of splitting prevention reinforcing bars, each of which extends along both columns, the beam and the slab. And a mortar filled between the first precast concrete plates. 3. A pair of adjacent precast concrete plates of the plurality of pairs of precast concrete plates facing each other, wherein at least one pair of adjacent precast concrete plates are embedded in the two precast concrete plates, project from respective sides of the two precast concrete plates, and overlap with each other. 3. The structure according to claim 1, further comprising a loop-shaped reinforcing bar, and a pair of recesses for respectively receiving the both reinforcing bars, wherein each recess is filled with the mortar. 4.