JPS5941558A - Reinforcing of reinforced concrete pillar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies lateral stress and tightening stress to reinforced concrete columns for purposes such as earthquake resistance. Regarding reinforcement methods that also bear the axial force of columns.

Generally, in buildings such as school buildings, reinforced concrete columns for classes are installed as shown in Figure 1, but the walls are placed in only one direction (vertical direction in the figure).・There are cases where windows are installed in all directions (left and right in the figure), and there are cases where there are no walls at all. Such a structure does not receive shearing forces in the direction of the pillars and walls, but may be destroyed by shearing forces that act in the direction of the walls.

The present invention aims to improve the above-mentioned conventional problems, and its purpose is to provide a reinforcement method that increases the shear strength of a reinforced concrete column in a predetermined direction and also bears the axial force of the column. There is something to do.

In order to achieve such an object, the present invention forms a through hole in the horizontal direction of a reinforced concrete column, and at the same time, a reinforcing member is completely bent through rods inserted into the through hole on both sides of the column where the through hole opens. The gist is that by tightening the nut screwed onto the rod, a reinforcing member applies lateral prestress to the column, and at the same time, the axial force of the column is balanced by the reinforcing member.

An example of spraying according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a side view of a reinforced concrete column to which the reinforcement method according to the present invention is applied, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2.

In Figure 2, // and /2 are orthogonal beams, and /3 is the floor. A reinforced concrete column /q is provided between the intersection of these beams // and 7.2 and the floor 13. This reinforced concrete column /II- has vertically spaced through holes /A, /l,% horizontally bored therein. Then, the 11th side of both eyes of the pillar where the through hole /6 opens /'/FLI/ψb
A reinforcing member with a channel-shaped cross section /7a, /7
1) is attached via a rod inserted through the through hole 16.

Please tell me how to install it in detail.First of all, I would like to explain how to install the reinforcing member/7a.
, /7b' (R column along both sides /'APL, /lb), and wedges are fixed at the top and bottom ends.Next, install the required number of rods and /7b' (r) along the reinforcement members and through holes. /
Insert into A. At this time, the head of the rod and the reinforcement part/7
A washer 19 is interposed between it and a. and rod l
Attach the nuts (2) and 2/ to each end of the threaded part through the washer 20f, and tighten the nuts 12/. Then, the reinforced concrete column /l/- is given lateral prestress by the reinforcing members /72L, /7t), increasing its shear strength.

Next, silver plates 2.2...), 2'z are welded to the upper and lower ends of reinforcing members /7a and /7'b at t'L, respectively, and the steel plates and beams are welded here. The gap between // and the floor /3 is filled with mortar J...power. By doing so, part of the axial force of the column 11 can be borne by the reinforcing material, and the shear strength can be further improved completely.

It should be noted that the above embodiments are merely examples of implementing the present invention, and the present invention is not limited to the above embodiments. For example, in the illustrated example, pre-stress is applied only in the left-right direction 1c, but pre-stress in the front-rear direction may also be applied by providing reinforcing members 17 on the front and rear surfaces of the column.

The reinforcing member is not limited to a channel, and two angles may be used back to back.

As is clear from the above description, according to the present invention, a horizontal through hole is formed in a reinforced concrete column, a rod is inserted through the through hole, and a reinforcing member is attached to the outside of the side of the column where the through hole opens. By attaching the rod and tightening the nut screwed onto the tip of the rod, the reinforcing member is brought into pressure contact with the side of the column, imparting a lateral prestress number to the column, and at the same time eliminating the axial force of the column. So,
For example, even in a building with few walls in a certain direction, such as a school building, sufficient Y force resistance can be imparted. Since only the reinforcing members are held in place, the number of reinforcements is reduced compared to the conventional reinforcement method of adding stirrups to existing columns, and concrete casting such as pouring a confetti track between the stirrups and columns is possible. There is no need for a sill, the interior will not get dirty, and the construction period will be shortened.

In addition, applying lateral prestress has a higher reinforcing effect on columns than increasing the total number of stirrups, and even if the concrete at the top and bottom ends of the column comes out due to repeated bending stress71, the reinforcing members will not be able to maintain the axial force. The pillars will not be shortened.

[Brief explanation of drawings]

Figure 7 is a plan sectional view showing an example of the relationship between pillars and walls in a conventional building, Figure 2 is a 11-view diagram of a reinforced concrete column to which the reinforcement method according to the present invention has been applied, and Figure 3 is FIG. 3 is a sectional view taken along line A-A in FIG. 2; /I1. ...Reinforced concrete column, /9a, /IJb
... Side of reinforced concrete column, /6 ... Through hole,
/7a, /71)...Reinforcement member, ig...Rod,
Ko/...Natsuto. Applicant's agent Kiyota Inomata I Sonohisa 3 Figure 2

Claims (1)

[Claims] A horizontal through hole is formed in the reinforced concrete column, and these 4
A reinforcing member is provided on the outside of each of both side surfaces where the through hole is open, into which a rod that completely passes through the through hole is inserted, and the reinforcing member is brought into pressure contact with both side surfaces by tightening the screw threaded onto the tip of the rod. A method for reinforcing a reinforced concrete column, which is characterized by applying prestress in the horizontal direction to the column and also fixing a reinforcing material in the vertical direction to bear part of the axial force of the column.