JPH0213643A - Beam part penetration hole periphery reinforcing member for steel reinforcement or steel frame concrete structure - Google Patents

Abstract

PURPOSE:To improve strength and facilitate execution by arranging steel reinforcements in the aslant direction and the horizontal direction and forming the outer shape into nearly octagonal form and forming the thickness from two layers. CONSTITUTION:As for a main reinforcement A, the both edges of a horizontal steel reinforcement are bent, keeping a certain inclination angle, and each of the angle and length of the inclined part at the right and left is made equal, and a plurality of said main reinforcements A are arranged so that the horizontal parts on a same plane are set parallel, keeping an certain interval. A plurality of auxiliary reinforcements B connecting the main reinforcements A are arranged on a same side surface for the main reinforcement A so as to cross with the main reinforcements A and are in the lateral symmetry from the center line of the horizontal part of the main reinforcement A. Two pieces of the arrangement of the main reinforcement A and auxiliary reinforcement B are connected by superposing the inclined parts of the main reinforcement A in the 180 deg. symmetry, and the outer shape is formed into nearly octagonal form, and the thickness is formed from two layers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in reinforcing materials around through-holes in beams of reinforced steel or steel-framed concrete structures. ``Prior art and problems to be solved by the invention] In the beams of reinforced or steel-framed concrete structures, through holes (hereinafter simply referred to as holes) are drilled for air conditioning, water supply and drainage, and power distribution. Since the part becomes structurally weak, the area around the hole must be reinforced.One way to do this is to reinforce the area around the through hole with a wire mesh made of reinforcing bars.

Generally, when reinforcing the area around the beam hole with a wire mesh of reinforcing bars,
From a strength standpoint, it is necessary to place reinforcing bars in a diagonal direction around the hole in order to withstand the shear force that is applied around the hole.In particular, it is necessary to place reinforcing bars in a diagonal direction that is perpendicular to a line that is 45 degrees from the center of the hole. Placement required. In addition, for bending moments, it is desirable to arrange horizontal reinforcing bars parallel to the beam and above and below the hole.

In addition, in terms of construction, if the outer shape of the reinforcing wire mesh is rectangular and the corners are long, the corners may get in the way during installation, making the work difficult, so it is preferable to have no corners. Furthermore, when considering the wire mesh in the thickness direction, if the reinforcing bars are welded together in three layers (triple layers), when pouring concrete into the reinforcing material, the fluidity of the concrete may be affected. It has also been found that it is preferable for the wire mesh to be composed of two layers as much as possible since there is a risk that the filling properties of the wire mesh may become insufficient.

On the other hand, considering these points and considering conventional reinforcing materials, for example, in the example of Japanese Patent Publication No. 44-21260, the reinforcing material is a two-layer rectangular structure with diagonal reinforcing bars orthogonal to the holes. It is made of concrete and has very good strength, but if it becomes necessary to place reinforcing bars in a horizontal direction to prevent bending moment, three layers will have to be used when pouring concrete. This may cause problems with the filling properties of the concrete, and since the outer shape is rectangular, the corners are protruding, making installation work difficult.

On the other hand, the structure shown in Japanese Patent Publication No. 59-10454 does not have many problems in terms of workability, and is inferior in terms of strength because it basically does not have reinforcing bars arranged in diagonal and horizontal directions.

The present invention has been made to improve these problems in the prior art.In terms of strength, the strength is maintained by arranging reinforcing bars in the diagonal and horizontal directions, and in terms of construction, the reinforcement The aim is to provide good workability by eliminating the corner portions and by making the thickness two layers.

[Means for Solving the Problem] To achieve this object, the reinforcing material of the present invention bends a horizontal reinforcing bar at both ends while maintaining a constant inclination angle, and adjusts the angle and length of the left and right inclined parts. In a reinforcing material consisting of the same main reinforcement and auxiliary reinforcement that connects the main reinforcement, multiple main reinforcements are arranged on the same plane with their horizontal parts parallel to each other at regular intervals, and the auxiliary reinforcement is arranged so as to intersect with the main reinforcement. , a shape in which multiple reinforcements are arranged symmetrically from the center line of the horizontal part of the main reinforcement, and on the same side of the main reinforcement, and these two or the inclined parts of the main reinforcement are overlapped 180 degrees symmetrically. It is characterized by an approximately octagonal outer shape and two layers.

[Operations] As described above, the reinforcing material of the present invention has main bars and auxiliary bars made of reinforcing bars arranged in a rational manner, and the outer shape is approximately octagonal with no corners.
Moreover, since it has two layers of thickness, it exhibits sufficient strength to reinforce through-holes in beams, and at the same time has excellent workability and does not impede the ability to fill concrete.

[The reinforcing material in the detailed description of the invention is based on the following ideas. By using an integrated reinforcing bar with both ends of horizontal reinforcing bars bent at diagonal angles as the main reinforcement, horizontal reinforcing bars and diagonal reinforcing bars are not stacked by welding to form two layers, but are made into one layer,
At the same time, the angle of the material required for strength is satisfied. These main reinforcements are connected by welding with a plurality of auxiliary reinforcements. In this case, the plurality of auxiliary reinforcements are arranged only on the same side with respect to the main reinforcement, so that the main reinforcement and the auxiliary reinforcement form two layers. Two pieces of this shape are 180 degrees symmetrical, with the inclined parts of the main bars overlapping each other and connected by welding, and the outer shape is approximately octagonal with rounded corners, and the thickness is two layers. The reinforcement material is designed to have a shape with a space inside which the beam hole enters, thereby obtaining a two-layer reinforcing material with rounded corners and good workability.

Note that the reinforcing material of the present invention is expressed as described above for convenience of expression, not depending on the manufacturing method, but it is sufficient as long as the above shape is satisfied.

Hereinafter, for convenience of explanation, the present invention will be described in detail using schematic diagrams.

In FIG. 1, a horizontal reinforcing bar is bent at a constant inclination angle θ1 at both ends, and the left and right inclined portions have the same length and angle as the main reinforcement A. A plurality of these main reinforcements A (three in the figure) are arranged on the same plane, at a constant interval so that the horizontal parts are parallel, and the main reinforcements A
A plurality of auxiliary reinforcements B (five in the figure) are placed at appropriate intervals so as to intersect with the main reinforcement B, so that they are symmetrical from the center line of the horizontal part of the main reinforcement A, and on the same side as the main reinforcement A. C is a shape in which the intersections of main reinforcement A and auxiliary reinforcement B are connected by welding (in the figure, the solid line indicates the first layer, and the dotted line indicates the second layer). This shape C has a substantially convex outer shape.

Next, as shown in Figure 2, two pieces of the above shape C are combined into one
Arrange them 80 degrees symmetrically, intersect the inclined parts of the main reinforcements A, and connect each intersection by welding to form an approximately octagonal outer shape.The center interior will be a hexagonal shape into which the beam hole will fit. A reinforcing material with space and two layers of reinforcing bars can be obtained.

In Fig. 1, the angle θ of the inclined portion of the main reinforcement A is preferably 45 degrees from the point of view of the shear strength of the reinforcing material.
There is no problem even at 35 to 55 degrees 6 Also, the convex point that changes from the horizontal part of the placed main reinforcement to the inclined part is designed so that the line connecting the 8 curved points at the same position of each main reinforcement is on a straight line. Preferably, the angle θ2 formed by connecting the left and right convex points with respect to the horizontal part of the main reinforcement A is preferably 90 degrees, but 60 to 120 degrees.
There is no problem even in degrees. However, the above θ3. If the angle θ2 greatly deviates from the above range, the length of the reinforcing material becomes too long horizontally or vertically, causing a problem.

Furthermore, it is desirable for the auxiliary reinforcement B to be substantially orthogonal to the main reinforcement A in terms of strength. This auxiliary reinforcement B serves to connect the main reinforcement to the main reinforcement, and to improve the stability of the welded part at the intersection of the auxiliary reinforcement B and the main reinforcement A to be integrated with the concrete during concrete pouring. There is no problem as long as it is not extremely oblique.

[Effects of the Invention] As explained above, the beam through hole reinforcement material of the present invention uses reinforcing bars in the diagonal and horizontal directions, so it has excellent strength, and in terms of construction, it has two layers of thickness. It is made of solid wood, and its outer shape is not rectangular but has rounded corners, making it easy to construct.

[Examples] Figures 3 to 6 show examples of the present invention. In the figure, the shaded area is the first layer, and the shaded area is the second layer.
This is the case when 2=90°.

FIG. 3 shows a space 3 in the center where the beam hole is located,
There are three main reinforcements 1 arranged in parallel on each side with the space between them, and five main reinforcements on the upper and lower sides welded almost orthogonally to the main reinforcements.
A reinforcing material formed from wooden auxiliary reinforcements 2 is shown. In this reinforcing material, the inclined portions at both ends of the two trees inside the main reinforcement 1 overlap each other and are connected. In the illustrated example, the upper main reinforcement and the lower auxiliary reinforcement are the first layer, and the upper auxiliary reinforcement and the lower main reinforcement are the second layer.

FIG. 4 shows an example in which the number of main reinforcements 1 and auxiliary reinforcements 2 is increased in the example of FIG. 3, and there is basically no difference from the example shown in FIG. 3.

In addition, in the examples shown in Figures 5 and 6, the outermost main reinforcement 1 is made by extending the extension line of the left and right inclined parts following the horizontal part of the main reinforcement by a certain length in the vertical direction. The reinforcing material is shown, and the overlapping vertical parts of the upper and lower main bars are connected by welding.

These reinforcing materials may be appropriately selected and used depending on the diameter of the hole used, the structure and size of the beam, etc.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams for explaining the basic configuration of the present invention, and FIGS. 3 to 6 are plan views showing various embodiments of the present invention. A...Main reinforcement, B...Auxiliary reinforcement, C...Half shape of reinforcement. D...Convex point, 1...Main reinforcement, 2...Auxiliary reinforcement, 3...Central space part

Claims (1)

[Claims] 1. Bending a horizontal reinforcing bar at a constant angle of inclination at both ends;
In a reinforcing material consisting of main reinforcements with the same angle and length on the left and right inclined parts, and auxiliary reinforcements that connect the main reinforcements, multiple main reinforcements are arranged on the same plane with their horizontal parts parallel and at regular intervals. Then, the auxiliary reinforcement is placed so that it intersects with the main reinforcement.
A shape in which multiple reinforcements are arranged symmetrically from the center line of the horizontal part of the main reinforcement, and on the same side of the main reinforcement, and these two are placed 180 degrees symmetrically overlapping the inclined part of the main reinforcement. A reinforcing material around a through-hole in a beam part of a reinforced steel or steel-framed concrete structure, characterized in that it has a connected shape, has an approximately octagonal outer shape, and consists of two layers.