JPS5817865B2 - Method of assembling reinforcing bars using combined spiral tie bars in reinforced concrete columns, beams, etc. that have different enclosing cross-sectional areas along the longitudinal direction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling reinforcing bars using combined spiral tie bars in reinforced concrete columns, beams, etc. whose surrounding cross-sectional areas differ along the longitudinal direction.

The purpose of this is to form a pair of spiral reinforcing bars consisting of a plurality of consecutive hoops with the same outer diameter, and to create a combination spiral by interposing one of these hoops alternately between the other hoops. The hoops of each spiral band reinforcing bar are pulled out in opposite directions to each other in a plane perpendicular to the winding axis. By inserting the reinforcing bars in a surrounding manner while shifting their positions, and by sliding a portion of each spiral band reinforcing bar into each hoop, the surrounding cross-sectional area is different along the longitudinal direction. iron.

Figure 1: Maintenance of combined spiral ties wrapped around the main bars of concrete The objective is to improve the shape and restraint of the main reinforcement, increase the strength of the reinforcement against shearing force, and uniformize the strength of reinforced concrete columns, beams, etc. as a whole.

Embodiments of the present invention will be described below based on the drawings.

A plurality of continuous rectangular hoops with the same outer diameter dimension made of iron wire 1,
A combination in which a pair of spiral reinforcing bars 3゜4 are formed in such a manner that the hoops 2 of the other spiral reinforcing bar 4 are interposed alternately between the hoops 1 of one spiral reinforcing bar 3. A spiral band muscle 5 is formed.

For example, the combined spiral band reinforcement 5 is inclined so that the outermost main reinforcement 6 becomes narrower as it goes upward, and the central main reinforcement 7
A spiral band reinforcing bar 3 is attached to multiple main bars 6 and 7 groups whose
, 4 are inserted in such a way that they can surround the main reinforcement groups 6 and 7 by shifting their positions so that they separate in opposite directions in a plane perpendicular to the winding axis. Hoop 1 of spiral band reinforcing bars 3 and 4 according to the span of main bar 6
, 2 are shifted from each other in a plane perpendicular to the winding axis, the combined spiral band reinforcement 5 is fitted and engaged with the main reinforcement groups 6 and 7, and the spiral band reinforcing bars 3 and 4 are connected to each hoop 1 and 2, respectively. A part of the hoops 1 and 2 is brought into sliding contact with each other in the direction in which the hoops 1 and 2 are pulled out, thereby forming an assembly reinforcing bar 9.

It is possible to wrap the combined spiral tie reinforcements 5 even in the case of a shape in which the plurality of main reinforcements 6 and 7 groups expand upward, or in a shape in which they are twisted or diagonal.

Therefore, according to the present invention, the main reinforcements 6 and 7 of reinforced concrete columns and beams having different surrounding cross-sectional areas along the longitudinal direction,
It becomes possible to freely and easily wrap the combined spiral tie bars 5, and it becomes possible to save labor in reinforcing bar assembly work.

Moreover, since a part of each of the spiral band reinforcing bars 3 and 4 is brought into sliding contact with each hoop 12, the spiral band reinforcing bars 3 and 4 are attached to the main reinforcement 67 due to the friction in the sliding contact portion. This state can be sustained sufficiently, and hoops 1 and 2
Mutual withdrawal amounts can be adjusted more easily.

Furthermore, the shape retention of the combined spiral band muscles 5 is improved, and
The restraining force of the main reinforcements 6 and 7 acts as a dog, increasing the strength and toughness of the reinforced concrete itself.

In particular, since the combined spiral tie reinforcements 5 are inserted in a surrounding manner into a plurality of main reinforcements 6, 7 such as reinforced concrete columns and beams that have different enclosing cross-sectional areas along the longitudinal direction and are engaged with the columns and beams, In places where the surrounding cross-sectional area is small, combined spiral band reinforcement 5
has a can-like shape, and in places with a large surrounding cross-sectional area, the combined spiral tie reinforcements 5 are rough, and reinforced concrete columns and beams are reinforced almost uniformly throughout, and the load is concentrated in one place and transferred from that part. There is no possibility of breakage, and the strength can be balanced.

By compressing and tying the combined spiral ties 5 using a suitable binding device 8, it becomes extremely convenient for transportation and stocking.

As explained above, according to the present invention, combined spiral tie bars can be freely and easily wrapped around the main bars of reinforced concrete columns, beams, etc. that have different enclosing cross-sectional areas along the longitudinal direction. The construction work can be simplified, the shape retention of the combined spiral tie bars wrapped around the main reinforcement and the restraint of the main reinforcement are improved, and the strength of the reinforcing bars themselves against shear force is increased, increasing the strength of reinforced concrete columns and beams. It has various effects such as being uniform throughout and preventing damage due to concentrated loads.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of the stirrup in a contracted state, FIG. 2 is a cross-sectional view in use, and FIG. 3 is a side view of the assembled reinforcing bar. . 1.2... Hoop, 3, 4... Spiral band reinforcement, 5... Combined spiral band reinforcement, 6, 7...
... Main bar, 8... Binding tool, 9... Assembly reinforcing bar.

Claims (1)

[Claims] 1 A pair of spiral reinforcing bars consisting of a plurality of consecutive hoops with the same outer diameter dimension is formed, and the combined spiral reinforcing bars are formed by interposing the other hoop alternately between one of these hoops, in the longitudinal direction. The hoops of each spiral band reinforcing bar are pulled out in opposite directions on the inner surface perpendicular to the winding axis and shifted in position on multiple main bars such as reinforced concrete columns and beams that have different enclosing cross-sectional areas along the Reinforced concrete columns and beams having different enclosing cross-sectional areas along the longitudinal direction, characterized in that they are inserted in a circumferential manner and engaged with each other, and a part of each hoop of each spiral band reinforcing bar is brought into sliding contact. Reinforcement assembly method using combined spiral ties in etc.