JPH0534464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a reinforcement arrangement method for reinforced concrete columns.

``Problems to be solved by conventional technology and inventions'' The development of super high-rise RC buildings is actively progressing in various fields with the aim of reducing the cost of building structures. In the structural design of this super high-rise RC building, the key point was how to ensure the toughness of the columns under high axial force and high shear force. It is effective to restrain all the main reinforcements using hoops, etc. For reinforced concrete columns with a rectangular cross section, as shown in Figure 9, it is considered effective to restrain all the main reinforcements with hoops, etc. The reinforced main reinforcements 1..., 2... are surrounded by square hoops 3..., etc., and the intermediate main reinforcements 2... excluding the main reinforcements 1... at the four corners are surrounded by another core hoop (reinforcement bar) 14.
...methods of restraint are being tried. In the figure, 5
is poured concrete.

However, in this case, if there are a large number of main reinforcements, it becomes impossible to restrain all the intermediate main reinforcements internally, and a problem still remains in terms of ensuring toughness. In addition, all reinforcing bars must be constructed on-site, resulting in significantly poor workability.

By the way, as a means to increase the shear strength, Japanese Patent Application Laid-open No. 47-25926 and Japanese Patent Application Laid-Open No.
There is one published in No. 48-95020.

The former uses a shear reinforcing material in addition to the hoop, and the shear reinforcing material is made by bending and raising a thin steel plate with the required number of vertical and horizontal cuts alternately with horizontal cuts. A projecting piece and a lower projecting piece are formed, and the top of the upper projecting piece and the top of the lower projecting piece are respectively welded to intermediate reinforcing bars and then driven into the core concrete,
The aim is to make the shear reinforcement act like a truss.

However, in such a configuration, the pitch of the connection between the intermediate reinforcement and the top of the upper protrusion and the top of the lower protrusion of the shear reinforcement is too rough, and a sufficient restraining effect of the core concrete cannot be expected. The concrete is divided at various places by the upper and lower protrusions of the thin iron plate, and the properties of the concrete itself with respect to axial force and shear are deteriorated, making it impossible to withstand high axial force.

In addition, in the latter case, main reinforcements are arranged in a rectangular shape along the circumferential surface of the column, and spiral reinforcements are arranged to integrally surround these main reinforcements, except for those located at the inner corners. However, hairpin-shaped insert bars made of deformed reinforcing bars are straddled over each of the main bars at the inner corners, the tips of which are made to protrude inside the spiral bars, and the core concrete is restrained by these reinforcements. It is.

However, such hairpin-shaped inserts made of a single material cannot provide strong restraint and anchoring properties, and
RC buildings cannot be expected to maintain toughness under high axial force and high shear force.

Taking these things into consideration, the present invention attaches a parallel bar continuous in the direction of the material axis to the main reinforcement, and the bent part on the side that is not connected to the main reinforcement is firmly placed inside the core concrete surrounded by a hoop. This method aims to solve the various problems mentioned above by fixing the core concrete, increasing its binding effect, and increasing its toughness.In addition, it also enables factory production, facilitates transportation, and improves the stability of the core concrete at construction sites. The aim is to improve workability in the area.

"Means for Solving the Problem" The present invention surrounds a plurality of main reinforcing bars with a hoop or the like, and lines each main reinforcing bar with a cathode bar parallel to the axis of the material, so that each bend on one side of each of the main reinforcing bars is The core concrete is characterized in that each section is connected to the main reinforcement, and each bent section on the other side projects toward the inside of the core concrete.

``Action'' Because of the above configuration, each main reinforcement is
Not only is it restrained by the hoop, but it is also sufficiently restrained by each of the lightning bars held and supported by the core concrete, and as a result, the core concrete is strongly restrained.

"Example" Part 1. Figures 1 and 2 show the first example. In the figures, 1..., 2... are the main reinforcements at the four corners arranged in a rectangular manner along the circumferential surface of the column. and multiple intermediate main bars, 3...
is a square hoop surrounding those main reinforcements, 5 is poured concrete, 6... is bent into a lightning shape (wavy shape) and placed along the intermediate main reinforcements 2..., each bent part on one side is electrically welded, Each is connected to the main reinforcement by gas welding or mechanical connection, and each bent part on the other side is made to protrude toward the inside of the core concrete 5',
These are the hazel lines that are buried in the core concrete.

Part 2. Figures 3 and 4 show a second embodiment. In this case, in the first embodiment, auxiliary reinforcements 7 are placed along the outer edges of the lightning bolts 6 and electrically welded. , bonded by welding or mechanical bonding.

Part 3. Figures 5 and 6 show a third embodiment, in which two lightning muscles 6 are joined to one auxiliary reinforcement 7 in the second embodiment. are doing.

Part 4. Figures 7 and 8 show a fourth embodiment, in which the lightning stripes 6 are formed sufficiently large and alternately intersect with each other in the first embodiment. There is. By doing this, it is also possible to have the lightning muscles directly share the shear force.

In addition, in the first to third embodiments, auxiliary hoops may be placed between the lightning lines 6 inside the core concrete 5'.

"Effects of the Invention" According to the present invention, each main reinforcement is not only restrained by hoops, but also embedded in the core concrete in the axial direction and joined at each bend on one side, so that it is firmly attached to the core concrete. Since the parallel bars that are held, supported, and anchored are sufficiently restrained over the entire length of their attached parts, the anchoring properties of all the main bars can be greatly improved, thus making the core concrete stronger. It is possible to significantly improve the restraint effect of core concrete, and to greatly improve the toughness under high axial force and high shear force, making it possible to
Can be effectively used for RC buildings.

In addition, not only can lightning bars be installed in large quantities at the factory, but they can also be installed on the main bars in one plane, so they can be stacked without wasting space or hindering transportation, storage, etc. It is convenient for transportation, storage, etc., and can improve workability at construction sites, thereby reducing the construction cost of super high-rise RC buildings, which is extremely beneficial.

[Brief explanation of drawings]

1 to 8 show embodiments of the present invention, FIG. 1 is a cross-sectional plan view of the first embodiment, FIG. 2A,
B is a perspective view and a cross-sectional plan view of the main parts of the same example, FIG. 3 is a cross-sectional plan view of the second embodiment, and FIGS. 4A and B are
are a perspective view and a cross-sectional plan view of the same example, and FIG. 5 is a third view of the same example.
The cross-sectional plan view of the main part of the embodiment, FIGS. 6A and B, are as follows:
FIG. 7 is a cross-sectional plan view of the fourth embodiment, and FIGS. 8A and 8B are a perspective view and a cross-sectional plan view of the main parts of the same example. , Figure 9 is
FIG. 2 is a cross-sectional plan view of a conventional example. 1... Main reinforcement at four corners, 2... Intermediate main reinforcement, 3... Square hoop, 4... Core hoop, 5... Pouring concrete, 5'... Core concrete, 6... Lightning bar, 7... Auxiliary muscle.

Claims (1)

[Claims] 1 Surround multiple main reinforcements with a hoop, etc., place a lightning bolt along each main reinforcement parallel to the material axis direction, connect each bent part on one side of these lightning reinforcements to the main reinforcement, and connect the bent parts on the other side. A reinforced concrete column reinforcement method characterized by having each bent part protrude toward the inside of the core concrete.