JP2001140403A - Auxiliary jig for steel bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel bar auxiliary jig to be used by attaching to the end portion of a steel bar for enhancing anchoring performance to reinforce concrete, thereby solving economy-related problems and the execution of work in the conventional method, in which the end portion of a steel bar is bent to form a hook. SOLUTION: A flat-shaped plate body 2 is attached in a structure to the one end of a tubular body 1 provided with a loose insertion hole 3 for steel bar. A gap space between a loose insertion hole and a steel bar 7 loosely inserted to the hole 3 is filled with an adhesive, and an auxiliary bar for steel bar is attached to the end portion of the steel bar by the hardening of the adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar assisting device which is attached to the end of a reinforcing bar of a reinforced concrete to enhance the fixing performance to the concrete.

[0002]

2. Description of the Related Art Reinforcing bars arranged in reinforced concrete have been arranged by bending the ends into hooks in order to enhance the fixing performance to the concrete. However, this means that in places where reinforcing bars are congested, such as joints between columns and beams, hooks have a problem that interferes with reinforcing bars of other reinforcing bars, so it is necessary to pay attention to the arrangement of reinforcing bars There was a problem in construction. In addition, an extra amount of rebar is required for the hook, which is economically disadvantageous. Further, it is difficult to bend the hook into a hook shape with a large-diameter reinforcing bar.

As one means for solving this problem, there has been proposed a reinforcing bar assisting device (called a plate nut) disclosed in Japanese Patent No. 266215. This is dedicated to a screw rebar and has a structure in which a plate is attached to one end of a cylindrical body provided with a spiral groove that can be screwed into the screw rebar.

[0004] Due to the attachment mechanism for attaching to the rebar by screwing, it cannot be attached to a rebar other than the screw rebar. In addition, even if the same screw rebar is used, if the spiral specifications (pitch, height, etc.) do not completely match, the screw cannot be screwed. Since the screw specifications of commercially available screw rebars differ from manufacturer to manufacturer, this plate nut is used exclusively for screw rebars for specific manufacturers, and the range of use is extremely limited. This is a serious problem at the construction site where the use of reinforcing bars from various manufacturers is present.

[0005] The present invention relates to a reinforcing bar assisting device attached to an end of a reinforcing bar of a reinforced concrete to enhance the fixing performance to the concrete, which is attached to a cylindrical body and its side wall so as to project in a direction perpendicular to a cylindrical body axis. The cylindrical body is provided with a through-hole or a non-penetrating rebar play insertion hole along the axis thereof in the cylindrical body. A reinforcing bar assisting tool characterized in that the reinforcing bar assisting tool is fixed to an end of a reinforcing bar by curing an adhesive filled in a gap space.

FIGS. 1 and 2 (both are longitudinal views) show an example of a basic mode of the reinforcing bar assisting device of the present invention. FIG. 1 shows a case where the rebar play insertion hole is a through hole, and FIG. 2 shows a case where a non-penetrated bottomed hole. Reference numeral 1 denotes a cylindrical body, 2 denotes a plate body, 3 denotes a through-hole rebar insertion hole, and 4 denotes a bottomed rebar insertion hole. Reference numeral 7 denotes a reinforcing bar loosely inserted into the reinforcing bar insertion hole 3 or 4.

The cross-sectional shape of the cylindrical body can take various shapes such as a circle, an ellipse, and a polygon. The plate body is a flat plate, and its cross-sectional shape can take various shapes such as a circle, an ellipse, and a polygon. The position where the plate is attached to the side wall of the cylinder is preferably the end of the cylinder closer to the end of the reinforcing bar, but may be an intermediate position. In addition, it is preferable to provide an internal projection (usually a ring shape) 8 on the inner wall surface of the rebar insertion hole for improving the engagement with the hardening adhesive.

[0008] As the adhesive, an adhesive having fluidity at the time of injection and curing after injection is used. For example, cement-based (cement paste, cement mortar) and gypsum-based inorganic adhesives, and epoxy-based and acrylic-based organic adhesives can be used.

The plate body 2 acts as an anchor against the axial force applied to the reinforcing bar, resists the force, and provides a fixing effect similar to a hook having the reinforcing bar end bent. The fixing effect increases as the area of the overhanging portion of the plate increases. However, the larger this is, the greater the degree of bar arrangement interference of other reinforcing bars is the same as in the case of the hook. Therefore, it is desirable that the cross-sectional area be as small as possible as long as a predetermined fixing effect can be obtained. For this purpose, in the present invention, an improved means for providing a bush on the side wall surface of the cylindrical body is adopted. FIG. 3 illustrates this.

FIG. 3 is a side view, and 9 is a bush.
In addition to ribs, ribs (the heights of which are approximately the same as the brushes) 10 which are ridges extending in the axial direction of the cylindrical body may be used in combination. Each of the brushes may have a ring shape independently orbiting the cylindrical body, or may be a continuous ridge like a spiral. The orbital surface may be perpendicular to or oblique to the long axis of the cylinder.
As shown in the figure, the ribs may be staggered with the ribs as boundaries. In general, it is preferable to conform to the arrangement of the brushes and ribs of JISG3112.

The reinforcing bar assisting device is attached to the end of the reinforcing bar. At this time, if the reinforcing bar play insertion hole has a bottom, if the end of the reinforcing bar is inserted until the end of the reinforcing bar hits the bottom, the reinforcing bar end and the auxiliary tool end are automatically inserted. , The work of aligning both ends at the time of mounting is simplified. However, as described above, there may be cases where the plates of the assisting tool collide with each other in a portion where the arrangement of the reinforcing bars is congested. In this case, if the rebar play insertion hole is a through hole, the end of the rebar can be exposed from the end of the auxiliary tool, which is convenient for position adjustment.

Injection of the adhesive into the cylinder after the rebar insertion is performed through the side hole 5 provided in the side wall of the cylinder. The injection is performed in a direction in which the adhesive rises from bottom to top. Providing the side holes at two locations above and below the side wall is convenient because either one can be used as an injection port depending on the injection direction.

When the rebar insertion hole has a bottom, a bottom hole 6 as a through hole is provided at the bottom, and when the injection direction is from the bottom to the top, the injection is performed from the bottom hole. In this case, the gas is injected from the side hole, and the bottom hole is used as a vent hole. In addition, when the injection direction is horizontal, there is an advantage that it is easier to achieve complete filling when injecting from the bottom hole than when injecting from the side hole.

Prior to the injection of the adhesive, it is necessary to temporarily fix the reinforcing bar assisting tool substantially coaxially with the reinforcing bar at the end of the reinforcing bar.
It is preferable to provide a bolt hole 11 for performing this temporary fixing by pressing with a bolt screwed into the cylinder. This bolt hole may be used as an adhesive inlet or a vent hole.

[0015]

The reinforcing bar assisting device of the present invention can be attached to the reinforcing bar as long as it can be loosely inserted into the bottomed bar loose insertion hole in comparison with the plate nut, and the manufacturer, type,
It can be used regardless of its cross-sectional shape.

The provision of the brush on the side wall surface of the cylindrical body can reduce the cross-sectional area of the plate body, and enhances the usability in the area where the reinforcing bars are crowded.

When the rebar insertion hole has a bottom, the provision of the bottom hole facilitates the complete filling of the adhesive.

The provision of the bolt holes facilitates the temporary fixing of the reinforcing bar assisting tool to the end of the reinforcing bar.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a basic mode of the reinforcing bar assisting device of the present invention (when a reinforcing bar play insertion hole is a through hole).

FIG. 2 is a longitudinal sectional view showing an example of a basic mode of the reinforcing bar assisting device of the present invention (when the reinforcing bar play insertion hole is a bottomed hole).

FIG. 3 is a side view showing an example of an improved embodiment of the reinforcing bar assisting device of the present invention (in a case where a brush and a rib are provided).

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cylindrical body 2 plate body 3 penetrating rebar play insertion hole 4 bottomed rebar play insertion hole 5 side hole 6 bottom hole 7 rebar 8 internal projection 9 stick 10 rib 11 bolt hole

Claims (4)

[Claims] 1. A reinforcing bar assisting tool attached to an end of a reinforcing bar of a reinforced concrete to enhance fixing performance to the concrete, wherein the plate is attached to a cylindrical body and a side wall thereof so as to extend in a direction perpendicular to a cylindrical body axis. The cylindrical body is provided with a through-hole or a non-through-hole rebar insertion hole along the axis thereof, and a gap space between the rebar insertion hole and the rebar inserted loosely therein. The reinforcing bar is fixed to the end of the reinforcing bar by curing the adhesive filled in the reinforcing bar. 2. The reinforcing bar assisting tool according to claim 1, wherein a protrusion is provided on the surface of the side wall of the cylindrical body, which is a ridge extending in a direction transverse to a longitudinal direction of the cylindrical body. 3. The reinforcing bar assisting tool according to claim 1, wherein the reinforcing bar play insertion hole is a bottomed non-through hole, and a bottom hole is provided at the bottom thereof. 4. The reinforcing bar assisting tool according to claim 1, wherein a bolt hole for inserting a bolt is provided in the side wall of the cylindrical body.