JP3054359B2 - Reinforcement method of existing columns in multi-story 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 method for reinforcing existing columns in a multi-story building such as a building or an apartment house.

[0002]

2. Description of the Related Art Conventional methods for reinforcing existing columns include
It is known that after existing columns are wound with steel plates, mortar is injected between the steel plates and the existing columns, but the columns need to be exposed all around, and It is effective for pillars such as halls. However, in a multi-story building, this method cannot be used because the existing columns are not exposed all around.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a construction method which can be attached to an existing pillar of a multi-story building where the pillar is partially exposed and reinforced. In particular, it is a reinforcement method that can consider the life of the resident by reinforcing the part of the existing pillar that is exposed outside like an apartment house from outside.

[0004]

Means for Solving the Problems The present invention for this purpose, in reinforces the existing columns in the multi-story building or the like or apartment, the notch has Ketsu設the front upper and lower ends, embedded
A reinforcing PC board that exposes the steel plate that was
Fixed to the exposed outer periphery of the existing pillar to be reinforced
PC with upper and lower mounting holes penetrated through the slab
Weld the upper and lower ends of the plate with a connecting material and connect them ,
A multilayer structure in which the upper and lower PC boards are connected and fixed via the slab by injecting an adhesive into a mounting hole of the slab, a working gap between the PC board and the upper and lower surfaces of the slab, and a gap between the back face of the PC board and the existing pillar. This is a method for reinforcing existing columns in multi-storey buildings. In addition, a reinforcing PC board exposing a steel plate buried in a cutout portion provided in front of the upper and lower ends is provided, and the reinforcing PC board is provided on an exposed outer peripheral portion of an existing column to be reinforced on each floor, and a lower slab upper surface. With a slight gap between each and the lower surface of the upper slab
The fixed connection, then insert the upper connecting piece with a wide joint surface at the upper end from the vertical mounting hole penetrated through the slab to the steel plate exposed at the notch at the upper end of the lower PC board Welding and positioning the joint surface of the upper connection piece near the upper end of the mounting hole of the slab, the steel plate exposed on the lower notch of the same PC board placed on the upper slab and the upper connection piece After welding connection to the joint surface with the lower connecting piece, adhesive is injected into the exposed part of the steel plate and connecting piece, the mounting hole of the slab, the working gap between the PC board and the upper and lower surfaces of the slab, and the gap between the back face of the PC board and the existing column By doing so, the upper and lower PC boards may be connected and fixed via the slab. In the present invention, the PC board refers to a precast concrete board manufactured in a factory.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. Figure 8 is in the form example that a reinforcement to the portion exposed to the corridor side of the existing column 1 in apartment, 2
8 Ru reinforcing PC Itadea used to it.

[0006]

[0007]

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

The PC board 28 shown in FIGS. 1 and 2 has a steel plate 6 buried as a structural steel material, and has a notch 23 which is partially open at the upper and lower ends and which is open at the front and lower ends. Are exposed, and a bolt insertion hole 61 is provided in the iron plate 6 where the bolt attachment hole 24 is provided. In addition, a hoop reinforcement is buried in the outer periphery of the iron plate 6.

In the reinforcing method using the PC board 28, first, as shown in FIG. 3 , a bolt 11 is protruded and fixed via an adhesive to a mounting hole 10 formed in the existing column 1 from the corridor side. Then the PC board 28 and fixed by screwing in the nut 12 through the insertion hole 61 of the mounting hole 24 and the iron plate 6 on the bolt 11, as shown in FIG. 4, below the vertical direction of the mounting hole 16 which is Toru設the slab 15 The notch 23 of the PC board 28 is arranged to face. In addition,
A slight working gap is secured between the back surface of the PC board 28 and the existing column 1 and between the lower end face of the slab 15 and the upper end face of the PC board 28, respectively.

[0016] Then, as in FIG. 5, the mounting hole 1 of the slab 15
6, the lower part of the iron plate 7 is welded to the iron plate 6 exposed at the notch 23 at the upper end of the lower PC board 28 by inserting the iron plate piece 7 serving as the upper connecting piece. The formed wide joint surface 70 is positioned at the upper end of the mounting hole 16 of the slab 15. Then as shown in FIG. 6, on the slab 15 in the same manner with the same PC board 28 at a construction gap between the slab 15 top fixed place to the existing column 1.

Then, as shown in FIG. 7 , the upper part of the iron plate piece 8 serving as the lower connecting piece is welded to the iron plate 6 exposed at the lower end notch 23 of the upper PC board 28, and the lower end of the iron plate piece 8 is It is welded to the joint surface 70 of the iron plate piece 7. Finally, figure
As shown in FIG. 8, the exposed notch 23 of the iron plate 6 and the iron plate pieces 7 and 8, the mounting hole 16 of the slab, the gap between the PC plate 28 and the upper and lower surfaces of the slab, and the gap between the back surface of the PC plate 28 and the existing column 1 The mortar 4 is press-fitted. Thus, the upper and lower PC boards 28 are connected via the iron plate pieces 7 and 8, and the upper and lower PC boards 28 are fixed to the existing column 1 between the upper and lower slabs 15 respectively.

According to this, since the structural steel material is an iron plate, the reinforcement is excellent in strength, and the iron plate pieces 7, 8 for connecting the PC plate 28 can be welded from the front to improve workability. Further, as shown in FIG. 8 , even if the upper and lower PC boards 28 are displaced in the front-rear direction, the upper iron plate piece 8 can be reliably welded because the joint surface 70 of the iron plate piece 7 is wide. In this case, even when the arrangement of the upper and lower PC plates 28 is shifted in the left-right direction, the upper iron plate piece 8 can be reliably welded because the joint surface 70 of the iron plate piece 7 is similarly wide. In this embodiment, the shapes of the upper connecting piece and the lower connecting piece and the configuration of the joining surface are appropriate.

Although the embodiment has the above-described configuration, the present invention is not limited to this. For example, regardless of the shape and configuration of the PC board, a configuration in which an iron plate is exposed on the back surface as shown in FIG. 9 may be used, and according to this, a thin PC board can be formed. It is only necessary to be able to adhere to the exposed outer peripheral portion of the existing pillar. Further, the shape and configuration of the connecting material for connecting the upper and lower PC boards are also appropriate.
Note that the steel materials of the upper and lower PC boards connected by the connecting material do not have to be connected to the structural steel material such as the main reinforcing bar, but may be fixed inside the PC board.

Further, the means for fixing the PC board to the existing pillars only needs to be able to be fixed by injecting an adhesive such as mortar, and does not need to be bolted as in the respective embodiments. In the case of the PC board shown in FIG. 9, the iron plate may be fixed with an adhesive. Also, the mounting position on the existing pillar may be from both from the indoor side,
In multi-family dwellings, construction from the outside corridor or balcony side is preferred to avoid inconvenience to residents.

[0021]

According to the first aspect of the present invention, a reinforcing PC is provided.
Improve the shear bending strength of existing columns by burying steel plates
And strengthening of pillars by improving the strength of joints
The strength of the whole building is improved. According to the second aspect , a PC board having high strength can be formed, which provides a more excellent reinforcing effect, and even if the arrangement of the upper and lower PC boards is shifted in the front-rear direction or the left-right direction, the work can be smoothly performed since the welding can be reliably performed.

[Brief description of the drawings]

FIG. Partially cut-out of PC board used in the embodiment of the present invention
FIG.

FIG. 2 FIG. 4 is a partially cutaway cross-sectional view of the PC board.

FIG. 3 Main part longitudinal section side view attached to the existing pillar
It is.

FIG. 4 Main part longitudinal view in a state attached to the existing pillar
It is.

FIG. 5 Longitudinal side of main part with upper connecting piece welded to PC board
FIG.

FIG. 6 Longitudinal side of main part with upper and lower PC boards facing each other
FIG.

FIG. 7 FIG. 4 is a vertical sectional front view of a main part in which upper and lower PC boards are connected.
You.

FIG. 8 Connect the upper and lower PC boards and press the mortar in the gap.
It is a principal part longitudinal side view in the state where it entered.

FIG. 9 It is a cross section top view of another example of a PC board.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Existing pillar 11 Bolt 15 Slab 16 Mounting hole 28 PC board 23 Notch 4 Mortar 6 Iron plate 7, 8 Iron plate piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Patent Publication No. 6-94733 (JP, B2) Japanese Patent Publication No. 58-21048 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 23/02 E04B 1/04 E04B 5/02 E04B 5/43

Claims (2)

(57) [Claims] 1. A reinforcing PC board for reinforcing an existing pillar in a multi-story building such as a building or an apartment house , wherein a buried steel plate is exposed in a cutout portion formed in front of upper and lower ends.
And the existing pillars to be reinforced on each floor are exposed.
Up and down direction fixedly disposed on the outer peripheral part and penetrated through the slab
The upper and lower ends of the upper and lower PC boards are welded with connecting
Injecting adhesive into the exposed part of the steel plate, the mounting hole of the slab, the gap between the PC plate and the upper and lower surfaces of the slab, and the gap between the back surface of the PC plate and the existing column, Reinforcement method. 2. A reinforcing PC board, in which a steel plate embedded in a cutout portion provided in front of upper and lower ends is provided, for reinforcing an existing column in a multi-story building such as a building or an apartment house, On the exposed outer periphery of the existing pillars to be reinforced on each floor, fixedly arranged with a slight gap between the upper surface of the lower slab and the lower surface of the upper slab, and then vertically installed through the slab From the mounting hole, insert the upper connection piece having a wide joint surface at the upper end and weld it to the steel plate exposed at the notch at the upper end of the lower PC board, and connect the joint surface of the upper connection piece to the slab. After welding and connecting the steel plate exposed at the lower notch of the same PC board placed on the upper slab and the joint surface of the upper connection piece with the lower connection piece, which is located near the upper end of the mounting hole. , Exposed part of steel plate and connecting piece, mounting hole of slab, P
An existing pillar in a multi-story building, wherein the upper and lower PC boards are connected and fixed via a slab by injecting an adhesive into a construction gap between the C board and the upper and lower surfaces of the slab and a gap between the back surface of the PC board and the existing pillar. Reinforcement method.