JPH1025906A - Reinforcing method for existing column in multistory building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing method of the existing column in a multistory building capable of ensuring excellent reinforced strength as reinforcement of the existing column in cast-in-place concrete. SOLUTION: In a reinforcing method of the existing column, a steel plate 4 is inserted into a through-hole 21 penetrated through a slab 20 in every story in the vertical direction, the steel plate 4 is inserted in an anchor bolt fixed by passing through the existing column 1, the steel plate 4 is placed to the front of the exposed circumference of the existing column 1 in every story to be reinforced by fixing and placing the steel plate 4 screwed in a nut from the front and the rear thereof at an interval from the circumferential end face, at the same time, a hoop 6 surrounding the steel plate 4 is arranged, a steel plate 4 projected upward from a lover slab 20 and the other steel plate 4 protected downward from an upper slab 20 are connected through an intermediate steel plate 5 placed at an interval in front of the existing column 1 in every story. Then, a form surrounding the hoop 6 is set to place concrete, and the column 1 and reinforced column sections 7 monolithically formed between up and down slabs 20 are continuously provided in the front of the column 1 in every story.

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-storey building such as a building or an apartment house.

[0002]

2. Description of the Related Art As a method of reinforcing an existing column, it is conceivable that an iron plate is closely wound around the existing column and then concrete is cast. However, the composite effect of the iron plate and concrete is poor and the reinforcing strength is low. It is assumed that it will not be so strong.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for reinforcing an existing column, which can ensure excellent reinforcing strength, as a method of reinforcing an existing column in place.

[0004]

Accordingly, a first aspect of the present invention is a method of reinforcing existing columns in a multi-storey building such as a building or an apartment building, and the existing columns to be reinforced in each floor are exposed. In front of the column outer periphery, a steel plate is arranged at an interval from the outer peripheral end surface, a hoop reinforcing bar surrounding the steel plate is arranged, and then a formwork surrounding the hoop reinforcing bar is set and cast into concrete. This is a method for reinforcing an existing column in a multi-story building, wherein a column and an integrated reinforcing column between the upper and lower slabs are connected in front of the column. Claim 2
In front of the exposed column outer periphery of the existing column of each floor to be reinforced by inserting a steel plate into the through-hole vertically provided in the slab of each floor, a steel plate is spaced from the outer peripheral end face. Arrange the hoops surrounding the steel plate, connect the steel plate projecting upward from the lower slab and the steel plate projecting downward from the upper slab, and then set the formwork surrounding the hoop reinforcement This is a method for reinforcing existing pillars in a multi-story building, characterized in that concrete pillars and concrete pillars are integrated in front of the pillars on each floor, so that the pillars and the upper and lower slabs are integrated. Further, in claim 3, the steel sheet is inserted into the through hole penetrating through the slab of each floor to project vertically above and below the slab, and the steel sheet and the existing pillar of each floor are spaced apart from each other. This is a method of reinforcing existing columns by connecting steel plates vertically. According to a fourth aspect of the present invention, in the first to third aspects, the steel plate is inserted into the anchor bolt fixed to the existing column, and the steel plate is fixedly arranged by screwing it from the front and rear with a nut.

According to the first aspect of the present invention, since the steel plate is a reinforcing column portion buried surrounded by a hoop streak and is integrally provided between the column and the upper and lower slabs in front of the existing column, The reinforcement is excellent. Further, in the second and third aspects, since the steel sheet is vertically connected to the slab in particular, stronger strength can be obtained. Further, according to the fourth aspect, the arrangement of the steel plate at an interval from the outer peripheral end surface of the existing column can be secured, and the steel plate is strongly held by the existing column and integrated.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to illustrated embodiments. The embodiment shown in FIGS. 1 and 2 is to be installed on the outer peripheral portion of the existing pillar 1 of the apartment house exposed to the corridor 2 side. First, as shown in FIG. A hole 10 is formed, and the anchor bolt 3 is fixed to the mounting hole by projecting it forward (to the side of the corridor 2) via an adhesive.

Next, the nut 31 and the seat plate 32 are arranged opposite to the bolts 3 respectively, and the steel plate 4 such as an iron plate passed through the bolt 3 from the insertion hole 41 is sandwiched between the seat plates 32 to fix and hold the steel plate 4. You do it. The steel plate 4 is arranged at an interval of about 50 mm from the outer peripheral end face 12 of the existing pillar 1 on the corridor 2 side. Further, as shown in FIG. 3, a through-hole 21 is vertically provided through the front of the existing column 1 in the corridor slab 20, and the steel plate 4 is inserted into the through-hole 21 so that one steel plate is provided above and below the slab 20. 4 are arranged through.

Then, as shown in FIG. 1, the lower end of the steel plate 4 projecting below the slab 20 and the upper end of the steel plate 4 projecting above the slab 20 under the slab 20 are similarly installed without the slab 20 interposed therebetween. The column 1 is welded and connected to the column 1 via an intermediate steel plate 5 fixed and held at intervals by a bolt 3 and a nut 31 and a seat plate 32. That is, the upper end of the intermediate steel plate 5 is butt-butted and welded to the lower end of the steel plate 4 projecting below the slab 20, and the lower end of the intermediate steel plate 5 is joined to the upper end of the steel plate 4 projecting above the lower slab 20. Butt welding is performed.
As a result, the steel plates 4 and 5 are vertically connected in a series.

Prior to the connection of the steel plates 4, 5, a number of hoop bars 6 surrounding the steel plates 4, 5 are arranged. The arrangement of the hoops 6 may be fixed to the steel plates 4 and 5 in advance, or the steel plate 4 having the hoops 6 may be inserted into the through holes 21 of the slab 20.

Then, after the formwork is arranged between the upper and lower slabs surrounding the hoop 6, the concrete is cast and the reinforcing column 7 is connected in front of the existing column 1 between the upper and lower slabs.

According to this example, the steel plates 4 and 5 are strongly held by the bolts 3, and the reinforcing column portions 7 are strengthened by the hoops 6 surrounding the steel plates 4 and 5, and the concrete adhesion to the existing columns 1 is good and the existing columns 1 are provided. This is because the reinforcement strength of the column 1 is increased.
That is, since the space between the existing column 1 and the steel plates 4 and 5 is open, the reinforcing column 7 strongly adheres to the existing column 1.

Further, since the steel plate 4 penetrates vertically through the through hole 21 of the slab 20 on each floor and the steel plates 4 and 5 are integrated, a strong reinforcing column 7 is obtained, and the existing column 1 can be reinforced. It is. In addition, since it is on the side of the corridor 2, construction can be performed without hindrance to the resident's normal life.

Although the embodiment is made as described above, the present invention is not limited to this. For example, irrespective of the arrangement state of the hoop muscles, an elliptical hoop muscle as shown in FIG. 4 may be used. Further, the steel plate is not limited to a steel plate, and its shape is also appropriate. Further, the means for holding the steel plate is also optional, and is not limited to holding by a bolt. The thickness of the reinforcing pillar portion is not limited, and accordingly, the interval between the outer peripheral end surface of the existing pillar and the steel plate is appropriate, but the interval at which the hoop rebar can be arranged is required.

Further, as shown in FIG. 5, the steel plate 8 is held only between the upper and lower slabs to surround and arrange the hoop bars 9 without providing through holes in the slabs of each floor, and then surround the hoop bars 9. A method of setting a formwork and placing concrete may be used.

In the case where a steel plate is inserted into a through hole penetrating through a slab of each floor and connected vertically, an intermediate steel plate does not need to be interposed as in this embodiment, and the steel plate is directly inserted into the upper slab. The steel plate and the steel plate inserted in the lower slab may be connected.

[0016]

According to the first aspect of the present invention, the reinforcing columns are strengthened by the hoops surrounding the steel plate, the concrete is in good contact with the existing columns, and the reinforcing strength of the existing columns is increased. According to the second aspect, the reinforcing column portion is strengthened by the hoops surrounding the steel plate, the concrete is in close contact with the existing column, the reinforcing strength of the existing column is increased, and the steel plate is integrally connected up and down. A solid reinforcing column can be obtained to reinforce the existing column. According to the third aspect, the steel plate inserted into the through hole of the slab can be shortened by the interposition of the intermediate steel plate, so that the operation of inserting the slab into the through hole is facilitated. According to the fourth aspect, the steel plate can be securely held.

[Brief description of the drawings]

FIG. 1 is a partially cutaway longitudinal perspective view showing an example of a construction mode of the present invention.

FIG. 2 is a longitudinal sectional plan view of the reinforcing pillar portion.

FIG. 3 is a perspective view of a main part showing a holding state of a steel plate surrounded by hoop arrangements.

FIG. 4 is a longitudinal sectional plan view of another example of a reinforcing pillar portion.

FIG. 5 is a vertical sectional perspective view of still another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pillar 10 Mounting hole 12 Outer peripheral end face 2 Corridor 20 Slab 21 Through-hole 3 Anchor bolt 31 Nut 32 Seat plate 4,8 Steel plate 5 Intermediate steel plate 6,9 Hoop bar 7 Reinforcement pillar

Claims (4)

[Claims] 1. A method of reinforcing existing columns in a multi-story building such as a building or an apartment building, wherein a space is provided from an outer peripheral end surface of an existing column to be reinforced on each floor in front of an exposed column outer peripheral portion. In addition to arranging the steel plate, arranging the hoops surrounding the steel plate, and then setting the formwork surrounding the hoops and pouring concrete, in front of the column, integrally between the column and the upper and lower slabs. A method of reinforcing existing pillars in a multi-story building, characterized by connecting reinforced pillars in series. 2. A method for reinforcing existing columns in a multi-story building such as a building or an apartment building, wherein the steel columns are to be reinforced by inserting steel plates into through holes vertically penetrating through slabs of the respective floors. In front of the exposed column outer peripheral portion, a steel plate is arranged at an interval from the outer peripheral end face, and a hoop rebar surrounding the steel plate is arranged, and the steel plate projecting upward from the lower slab and the upper steel plate are arranged. A steel column projecting downward from the slab is connected, and then a formwork surrounding the hoop is set and concrete is poured in. In front of the column on each floor, a reinforcing column integrated between the column and the upper and lower slabs A method of reinforcing existing pillars in a multi-story building, characterized by the continuous construction of a plurality of floors. 3. A steel plate is inserted through a through hole penetrating through a slab of each floor to project vertically above and below the slab, and the steel plate is vertically connected to an intermediate steel plate arranged at an interval in front of an existing pillar of each floor. The method for reinforcing an existing pillar according to claim 2. 4. The method for reinforcing an existing column according to claim 1, wherein the steel plate is inserted into an anchor bolt fixed through the existing column, and the steel plate is fixedly arranged by screwing with nuts from front and rear. .