JPS5922164Y2 - spiral loop case - Google Patents

Description

[Detailed description of the invention] This invention relates to a spiral hoop cage body used for reinforced concrete structural columns and beam members.

Conventionally, various construction methods and forms of hoop bars have been proposed for the purpose of increasing the shear strength of reinforced concrete structural members.

Specifically, there are methods that involve the use of high-strength hoop reinforcements, methods that use a mesh material made by welding the intersection points of small-diameter reinforcing bars, methods that use a single hoop reinforcement in a spiral shape, or methods that use a double ( For example, reinforcing bars are laid out so that they intersect with each other.

In addition, the construction method is to wrap the hoop reinforcement around the axial main reinforcing bars placed at a predetermined position, and if necessary, weld the intersection of the hoop reinforcement and the axial main reinforcing bars, or to pre-spiral the hoop reinforcement. After forming the hoop into a shape and fitting it onto the axial main reinforcing bars, the spiral hoop bars are stretched in the axial direction of the main reinforcing bars to provide a predetermined hoop spacing.

However, in order to heat and cool the high-strength hoop bars and wrap them around the axial main reinforcing bars, large-scale mechanical equipment is required.
There are problems such as not being able to expect a transformer effect, and it is also difficult to arrange two hoop reinforcements so that they cross each other, so it has not always been easy to increase the shear strength of reinforced concrete structural members.

However, in this invention, a plurality of hoop steel materials are wound in a spiral shape with the forward and reverse leads intersecting each other, and the intersecting portions are welded to form a spiral hoop cage. When constructing the spiral hoop cage, four corner main reinforcements (in the case of a rectangular cross section) are installed inside the spiral hoop cage.

Reinforcement can be easily completed by placing the required amount of axial reinforcing bars, including three corner main reinforcements for triangular cross-sections and main reinforcements placed at predetermined intervals for circular cross-sections, and prefabricated rebar members suitable for erection assembly. can be obtained.

That is, a prefabricated reinforcing bar member can be manufactured by previously manufacturing a spiral hoop cage according to this invention at a factory and inserting axial reinforcing bars on site.

As a result, reinforced concrete structures with increased shear strength have become easily obtainable.

In addition, since the hoop steel material that maintains a positive lead angle and the hoop steel material that maintains an opposite lead angle are made of different materials,
Through the synergistic effect of both steel materials, we succeeded in further increasing the shear strength.

That is, to explain this invention with reference to an embodiment, hoop reinforcements 2, 2a, 2b, and 2C made of mild steel are wound counterclockwise while maintaining a predetermined lead angle along a jig 3 whose cross section is rectangular in a predetermined size. In addition to bending, hoop reinforcements 1, 1 a made of high-strength steel material
, 1 b, I C are wound around Ishinomaki in the opposite manner to the above, and the hoop lines intersect with each other in each surface of the jig 3, and the intersecting portions 4.4 a, 4 b... is welded and taken out from the jig 3 to form a spiral hoop cage.

The crossing portions 4, 4a, 4b, . . . are welded by, for example, a fludge-butt method.

According to the above embodiment, the hoop bars 1, 1a... are made of high-strength steel, and the hoop bars 2, 2a...
Since the ... is made of mild steel, the properties of both complement each other, and the synergistic effect makes it possible to create a cage with even higher shear strength.

Note that the material of the hoop reinforcement may be any material that complements each other, and is not limited to a combination of mild steel and high-strength steel.

Stranded wire can also be used.

When forming high-strength hoop lines, a heat treatment process such as high-frequency heat treatment is added during the winding process.

Further, although the winding was performed along the jig 3 having a square cross section, it is also possible to obtain a spiral hoop cage body having a circular cross section by winding along a jig having a circular cross section.

In order to construct a reinforced concrete structure using the spiral hoop cage body of the above embodiment, axial main reinforcing bars are arranged at least at the four corners of the spiral hoop cage body, and if necessary, the main reinforcing bars and the spiral hoop cage body are arranged. The hoop reinforcements can be welded or fixed with iron wire, and concrete can be poured in the usual manner.

The hoop reinforcement is arranged in a bar shape, and a reinforced concrete member can be obtained that is reinforced by the truss effect.

Next, in the embodiment shown in FIG. 4, the hoop bars 2, 2 a, 2 b, and 2 C made of mild steel are wound in the same manner as described above.
Hoop lines 1, 1 made of high-strength steel that are wound in the opposite direction
a, 1 b, I C lead angle, hoop muscle 2, 2a
, 2b, and 2C, the lead angles are not the same as those of 2b and 2c, but they are changed and wound to form a spiral hoop cage.

In the spiral hoop cage according to this embodiment, axial reinforcing bars are arranged inside as described above, and then concrete is poured to obtain a reinforced concrete structural member.

That is, according to this invention, the spiral hoop cage is constructed by winding the steel material for the hoop in a spiral shape while maintaining the forward and reverse lead angles, and welding the intersecting parts of the steel material for the hoop.
This has the effect of easily obtaining a reinforced concrete structure with strong shear resistance.

Furthermore, since multiple types of steel materials are used for the hoop, the shear strength can be further increased due to a synergistic effect.

[Brief explanation of drawings]

Fig. 1 is a partial front view of an embodiment of this invention, Fig. 2 is a sectional view, Fig. 3 is a partially expanded explanatory view, and Fig. 4 is a partial front view of another embodiment of this invention. , FIG. 5 is a partially expanded explanatory diagram. 1.1 a, 1 b, I C, 2, 2a, 2 b, 2
C...--Hoop muscle, 3...Jig, 4,4
a, 4 b...Crossover part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cage body made by winding a plurality of steel materials for hoops in a spiral shape while maintaining forward and reverse lead angles so as to intersect with each other, and welding the intersecting portions. Spiral hoop cage made of multiple types of steel materials. 2. The spiral hoop cage according to claim 1, wherein the positive lead angle and the negative lead angle of the hoop steel material are the same or different.