JPH0874328A - Joint bar anchor - Google Patents

Abstract

PURPOSE: To anchor a joint bar in a concrete anchor hole easily and in a stable state. CONSTITUTION: A tapered bar body 3 having a diameter becoming larger increasing as it goes downward through a step section with a small diameter is vertically provided to the lower end of a deformed steel bar 1, and a bottomed cylinder body 4 having a tapered hole 41 interlocked with a taper section 3' of the tapered bar body 3 is fitted in an interlocking state. The bottomed cylinder body 4 is formed in a manner that the outside diameter thereof is slightly larger than that the deformed steel bar 1 and that it is provided with a plurality of cut grooves 5 downward from the upper edge of an opening 42 . An elastic body 6 is made to lie between the lower surface of the tapered bar body 3 of the deformed steel bar 1 and the bottom plate 43 of the bottomed cylinder body 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tendon anchor.

[0002]

2. Description of the Related Art A conventional bar anchor is provided with a tapered bar body 20 having a diameter gradually increasing toward the lower end of a deformed bar steel 1 as shown in FIGS. 3 and 4, for example. An engaging cylinder body 21 having a taper hole 21 ₁ that engages with the taper portion 20 ′ of the taper rod body 20 is fitted into the taper rod body 20 in an engaged state, and an opening portion 21 of the engagement cylinder body 21. _{(2) A} reinforcing bar anchor is formed by forming a plurality of cut grooves 22 upward from the lower edge, and an anchor hole having a diameter slightly larger than the outer diameter of the locking cylinder 21 is drilled in concrete. The bar anchor is inserted into the anchor hole, the deforming steel bar 1 is fitted with the tool pressing cylinder a, and the lower end surface thereof is brought into contact with the upper end surface of the locking cylinder 21. By striking the upper part, the notch 22 of the locking cylinder 21 is expanded by the taper bar 20 of the lower part of the deformed steel bar 1, and Abutting engagement locked in over the hole inner walls, and the locking cylinder 21 and the tapered rods 20 are fixed to the profiled rod 1 anchor hole since it is fastened to the anchor hole wall together thereof.

However, this type requires a tool pressing cylinder a for driving the locking cylinder 21 and a tool pressing cylinder a matching the diameter of the reinforcing bar anchor each time. It was often difficult to leave this tool somewhere at the work site.

Further, when the upper portion of the tool pressing cylinder a is tapped to widen the cut groove 22 of the locking cylinder 21 to fix the deformed steel bar 1 to the anchor hole, the anchor hole of the anchor hole is tapped. There is a possibility that minute hair cracks may be formed on the concrete surface and the strength of the concrete may be weakened, or the locking force between the locking cylinder 21 and the anchor hole may be weakened, and the deformed steel bar 1 may loosen.

According to the present invention, in order to solve the above-mentioned drawbacks, when the reinforcing bar anchor is inserted into the concrete anchor hole to stop the pushing of the deformed steel bar 1 at a predetermined position, the deformed steel bar 1 is tapered by the restoring force of the elastic body 6. A cutout groove 5 of the bottomed tubular body 4 is widened by the wedge action of the portion 3 ′ and the tapered hole 4 ₁ of the bottomed tubular body 4 to provide a rebar anchor that can fix the rebar anchor in the anchor hole. It is a thing.

[0006]

The gist of the present invention will be described with reference to the accompanying drawings.

At the lower end of the deformed bar steel 1, a taper bar body 3 having a diameter gradually increasing toward the lower side is vertically provided via a step portion 2 having a small diameter,
The taper hole 4 that engages with the taper portion 3'of the taper rod body 3
_The bottomed cylindrical body 4 having ₁ is fitted in an engaged state, and the outer diameter of the bottomed cylindrical body 4 is slightly larger than that of the deformed steel bar 1 and the opening 4 ₂
A plurality of cut grooves 5 are formed downward from the upper edge, and an elastic body 6 is interposed between the lower surface of the tapered bar body 3 of the deformed steel bar 1 and the bottom plate 4 ₃ of the bottomed cylindrical body 4. The present invention relates to a tendon anchor characterized by the above.

[0008]

[Function] An anchor hole having a predetermined diameter is drilled in a concrete base with an anchor drill or the like, the reinforcing bar anchor is inserted into the anchor hole, and the elastic body 6 is compressed by the lower surface of the tapered bar body 3 of the deformed steel bar 1. While pushing the reinforcing bar anchor into the anchor hole, stopping the pushing of the deformed steel bar 1 at a predetermined position and releasing the hand, the deformed steel bar 1 is pressed upward by the restoring force of the elastic body 6, and the deformed steel bar 1 The notched groove 5 of the bottomed tubular body 4 is expanded by the wedge action of the tapered rod body 3 and the tapered hole 4 ₁ of the bottomed tubular body 4, and the cylindrical side surface of the bottomed tubular body 4 contacts the inner wall of the anchor hole. The deformed steel bar 1 and the bottomed tubular body 4 are integrated and fixed to the inner wall of the anchor hole.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The attached drawings show a preferred embodiment of the present invention, in which a tapered bar body 3 having a gradually increasing diameter is hung from a lower end of a deformed steel bar 1 via a step portion 2 having a smaller diameter. Set up.
The taper hole 4 that engages with the taper portion 3'of the taper rod body 3
The bottomed tubular body 4 having a ₁ engaged with the engaging state with the tapered rod 3, substantially equal profile of the outer diameter of the opening 4 ₂ a lower portion of the bottomed tubular body 4 to the outer diameter of the deformed steel bars 1 formed slightly than the outer diameter of the steel bars 1 large diameter, and to穿溝a plurality of notches 5 downward from the opening portion 4 ₂ upper edge. In the illustrated embodiment, a plurality of small holes 5 ′ are provided on the bottom of the cylindrical side surface of the bottomed cylindrical body 4.
To form an incision groove 5 from the small hole 5 ′ toward the upper edge of the opening 4 ₂ to facilitate insertion of the bottomed cylindrical body 4 into the anchor hole at the lower edge of the bottomed cylindrical body 4. A chamfer is provided.

An elastic body 6 such as a coil spring, a disc spring or a flexible resin body is interposed between the lower surface of the tapered bar body 3 of the deformed steel bar 1 and the bottom plate 4 ₃ of the bottomed cylindrical body 4.

Since the embodiment is configured as described above, the reinforcing bar anchor is inserted into the anchor hole having a predetermined diameter, and the elastic bar 6 is compressed on the lower surface of the tapered bar body 3 of the deformed steel bar 1 while the reinforcing bar anchor is being compressed. When the deformed steel bar 1 is pushed into the anchor hole to stop the pushing of the deformed steel bar 1 at a predetermined position and the hand is released, the deformed steel bar 1 is pressed upward by the restoring force of the elastic body 6 and the tapered bar body 3 and the bottomed cylindrical body 4 anchor hole inner wall of the tapered hole 4 ₁ and by the wedge action notches 5 of bottomed tubular body 4 is locked contact engaged with the expansion anchor hole inner wall deformed steel bar 1 a bottomed cylindrical body 4 and is integral of Locked in.

Further, when the bracket or the machine is fixed by inserting the anchor hole of the bracket or the machine into the deformed steel bar 1 embedded in the concrete and fastening the bracket or the machine with the nut, tensile stress acts on the deformed steel bar 1 and the tapered bar body 3 The bottomed cylindrical body 4 is further expanded by the tapered portion 3 ′, and the outer peripheral side surface of the bottomed cylindrical body 4 is further firmly locked and fixed to the wall surface of the anchor hole.

[0013]

As described above, according to the present invention, a tapered body having a gradually increasing diameter is provided vertically at the lower end of the deformed steel bar through a stepped portion having a small diameter, and is engaged with the tapered portion of the tapered body. A bottomed cylindrical body having a tapered hole is fitted in an engaged state, and the outer diameter of the bottomed cylindrical body is slightly larger than that of the deformed steel bar and has a plurality of cut grooves downward from the upper edge of the opening. Since it is formed in a shape, and an elastic body is interposed between the lower surface of the tapered bar of the deformed steel bar and the bottom plate of the bottomed cylindrical body, it locks by hitting the locking cylinder like a conventional rebar anchor. No special tool is required to open the cut groove of the cylinder, and a fine hair crack is generated in the anchor hole by hitting, and the locking force between the locking cylinder and the anchor hole is increased. There is no risk of the deformed steel bar becoming loose due to weakening, and the bar anchor of the present invention can be used as an anchor hole in the field. When inserted and stopped pushing at the desired position and released the hand, the deformed steel bar is pushed upward by the restoring force of the elastic body and the wedge action by the taper fixes the reinforced anchor in the anchor hole in a quick and stable state It will be a practical and excellent possible anchor anchor.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a usage state of an embodiment of the present invention.

FIG. 2 is a perspective view of a bottomed cylindrical body of the embodiment.

FIG. 3 is a partially cutaway front view showing a usage state of a conventional rebar anchor.

FIG. 4 is a partially cutaway front view showing a conventional use of a tendon anchor.

[Explanation of symbols]

1 Deformed bar steel 2 Step part 3 Tapered bar body 3'Tapered part 4 Bottomed cylindrical body 4 ₁ Tapered hole 4 ₂ Opening part 5 Cut groove 6 Elastic body

Claims (1)

[Claims] 1. A tapered rod body having a diameter gradually increasing toward the lower side through a step having a small diameter at the lower end of the deformed steel bar, and a taper hole engaging with the tapered portion of the tapered bar body is provided. The bottom tubular body is fitted into the engaged state, and the outer diameter of the bottomed tubular body is formed to be a shape having a plurality of cut grooves that are slightly larger in diameter than the deformed steel bar and downward from the opening upper edge, An elastic bar interposed between the lower surface of the deformed steel bar and the bottom plate of the bottomed tubular body.