JP3035245U - Screw rebar and screw rebar joint - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a threaded reinforcing bar which is strong against pulling or bending and a threaded reinforcing bar joint using the same. SOLUTION: The outer wall is provided with spirally formed troughs and crests of an inverted trapezoidal recess in cross section, and threads are formed, and the troughs are provided at predetermined pitches via ribs. The end portion of is formed in an arc shape, and the valley portion, the peak portion, and the rib are connected by a gently sloping surface.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a threaded reinforcing bar which is strong in tension and bending and a threaded reinforcing bar joint using the same.

[0002]

[Prior art]

 Conventionally, screw rebars have been known in which a V-shaped groove is spirally provided on the outer wall. In addition, the threaded rebar joint is constructed by connecting the two threaded rebars with a coupler, injecting and hardening a filling material into the gap between the threaded rebar and the coupler, and abutting the lock nuts on both ends of the coupler. It was known to be screwed and tightened.

[0003]

[Issues to be solved by the invention]

 In the above-mentioned known threaded rebar, since the thread troughs of the threaded rebars have a V-shaped cross section, when a tensile force or a bending force is applied, the force concentrates on the V-shaped troughs of the screw. There is a problem that the V-shaped valley may be cracked and the screw reinforcing bar may be damaged.

[0004]

[Means for solving the problem]

 However, in this invention, since the cross section of the screw trough of the screw reinforcing bar is formed into an inverted trapezoidal recessed shape, even if tensile force is applied to the reinforcing bar, there is no risk of local stress concentration, and the above-mentioned conventional problems Is solved.

That is, according to the present invention, the outer wall is provided with spirally shaped troughs and ridges of an inverted trapezoidal recess, and a screw is formed, and the troughs are provided through ribs at predetermined pitches. The end of the trough is formed in an arc shape, and the trough, the crest, and the rib are connected by a gentle inclined surface. The troughs and ridges of the recessed portion are spirally formed to form threads, and the troughs are provided at intervals of 1/2 pitch via ribs, and the ends of the troughs are formed in an arc shape. The circular arc at the end of the valley is formed as a part of a circle inscribed in the valley, and the valley, the mountain and the rib are connected by a gently sloping surface. It is a reinforcing bar. In another invention, the outer wall is provided with troughs having an inverted trapezoidal cross section of a male screw through ribs at predetermined pitches, and two troughs are formed in an arc shape. A screw rebar joint characterized in that screw rebars are connected by a coupler, lock nuts are tightened at both ends of the coupler, and a filler is filled and cured in the gap between the screw rebar and the coupler. The cross section of the male screw is a reverse trapezoidal shape, and recessed valleys are provided at predetermined pitches through ribs, and the ends of the valleys are formed in an arc shape. Is connected with a coupler, lock nuts are tightened at both ends of the coupler, and a filling material is filled and cured in the gap between the large diameter screw rebar and the small diameter screw rebar and the coupler. is there.

In the above-mentioned screw rebar, the connecting portion with the coupler is required to have a screw formed on the outer wall over an appropriate length.

The female screw provided on the inner surface of the coupler may be a screw screwed into the male screw of the screw rebar of the present invention having a rib at the valley portion at a predetermined pitch or a continuous screw. Good. Further, a large number of hemispherical concave portions (FIG. 8) or a large number of hemispherical convex portions (FIG. 9) are provided on both outer walls of the coupler. The reason why the recessed portion or the protruding portion is provided is to prevent the coupler from slipping when the coupler is used and to improve the adhesiveness with concrete. Examples of the filler in the above include epoxy resin adhesive, cement paste, cement mortar and the like. The filling material injection hole is usually provided at the center of the coupler where two screw rebars are joined. Also, the number of injection holes is sufficient for one, but in some cases multiple injection holes may be provided.

[0008]

[Embodiment of the invention]

 According to this invention, the outer wall of the screw rebar is provided with a trough portion and a crest portion of the recessed portion having an inverted trapezoidal cross section in a spiral shape to form a screw. The troughs are provided at intervals of 1/2 pitch via ribs, the ends of the troughs are formed in an arc shape, and the troughs, the peaks and the ribs are connected by a sloping slope. is there.

[0009]

Embodiment 1 An embodiment of the present invention will be described with reference to FIGS.

On the outer wall of the screw rebar 1, a trough portion 3 and a ridge portion 6 of the recessed portion 4 having an inverted trapezoidal cross section of the male screw 2 are spirally provided along the longitudinal direction. The valley portion 3 is provided with ribs at every 1/2 pitch, and the end portion of the valley portion 3 is formed into an arcuate portion 5 to form the screw rebar 1. In the above, a gentle sloped portion 7 is formed from the upper end of the arc-shaped portion 5 of the valley portion 3 to the valley portion 3. In the above description, the screw rebar 1 has an elliptical cross section, but the trough portion 3 of the male screw 2 of the screw rebar 1 has a trough so that the male screw 2 can be screwed into the female screw 9 provided on the inner surface of the coupler 8 described later. Part 3 is provided.

[0011]

Second Embodiment The present invention relates to a screw rebar joint 11 using the screw rebar 1 of the first embodiment, which will be described in detail with reference to FIG.

The two screw rebars 1 and 1 having the male thread 2 of the first embodiment are screwed into a coupler 8 having an internal thread 9 for engaging the male thread 2 on the inner surface and an injection hole 12 in the central portion. While fitting and fitting, lock nuts 13, 13 are brought into contact with both ends of the coupler 8 to tighten them. FIG. 6 shows a cement-based grout material 14 injected and hardened from the injection hole 12 of the coupler 8. In the above description, the two screw rebars 1 and 1 are screwed and fitted so that the joint is located at the center of the coupler 8. Further, the cement-based grout material 14 that has been injected is pressed into the injection hole 12 until it overflows from the lock nuts 13 and 13 that are in contact with the coupler 8. This is to fill the gap 15 between the male screw 2 and the female screw 9 with the cement-based grout material 14 so that the screw rebar 1 and the coupler 8 are integrated. In the above description, both ends of the coupler 8 are tightened with the lock nuts 13 and 13 in order to prevent the coupler 8 from loosening.

[0013]

Third Embodiment This invention will be described with reference to FIG. The present invention relates to a threaded reinforcing bar joint 1 using a threaded reinforcing bar 1 of Example 1 and two threaded reinforcing bars having different diameters. The large-diameter screw reinforcing bar 16 having the male screw 2 of Example 1 and the small-diameter screw reinforcing bar 17 are formed on the inner surfaces of the large-diameter screw reinforcing bar 16 and female screws 9 and 9a which are screwed onto the respective male screws 2 of the small-diameter screw reinforcing bar 17. And is screwed to the coupler 8 having the injection hole 12 in the center. Other configurations are omitted as in the first embodiment. This threaded rebar joint 11 is generally used for a concrete structure as it moves from a low rise to a high rise. 7, 13 and 13 are lock nuts screwed into contact with both ends of the coupler 8, 18 in FIG. 8 is a concave portion provided in the side wall of the coupler 8, 19 is also a decagonal wall, and 20 in FIG. 9 is a coupler 8. It is a convex part provided on the side wall.

[0014]

[Effect of the invention]

 In this invention, the troughs of the screw rebars are formed via ribs, and the ends of the troughs are formed in an arc shape, so there is no local concentration of force on the troughs, and tension or bending is not necessary. On the other hand, there is no risk of damage, and it has the effect of becoming a sufficiently strong screw rebar. Further, in this invention, the screw rebar and the coupler are fixed by the filler, and the both ends of the coupler are tightened with the lock nuts, so that the rigidity of the screw rebar joint is improved, and the screw is remarkably strong against tension or bending. It has the effect of forming a reinforcing bar joint.

[Brief description of the drawings]

FIG. 1 is a partial front view of an embodiment of the present invention.

FIG. 2 is a right side view of the same.

FIG. 3 is a sectional view taken along the line AA in FIG. 1;

4 is a sectional view taken along line BB in FIG.

FIG. 5 is a sectional view of the joint of the present invention.

FIG. 6 is a partially longitudinal front view of the same.

FIG. 7 is a front view similarly omitting a part of another embodiment.

FIG. 8 is a partially cutaway front view of the coupler of another embodiment.

FIG. 9 is a partial front view in which the coupler of another embodiment is partially broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw rebar 2, 2a Male screw 3, 3a Valley 4 Cross-section inverted trapezoidal recessed part 5 Arc part 6 Mountain part 7 Inclined part 8 Coupler 9, 9a Female screw 10 Rib 11 Screw rebar joint 12 Injection hole 13, 13a Lock Nut 14 Cement-based grout material 15 Gap 16 Large diameter screw reinforcing bar 17 Small diameter screw reinforcing bar 18 Recessed part 19 10 Square wall 20 Convex part

Claims (4)

[Utility model registration claims] 1. An outer wall is provided with spirally formed troughs and ridges of an inverted trapezoidal recess having a cross section, and is formed with screws, and the troughs are provided at predetermined pitches through ribs, and the troughs are provided. The threaded reinforcing bar is characterized in that the end portion of the portion is formed in an arc shape, and the valley portion, the mountain portion, and the rib are connected by a gently sloping surface. 2. An outer wall is provided with spirally formed troughs and peaks of an inverted trapezoidal recess having a cross section, and is formed with a screw.
It is provided via a rib at every / 2 pitch, the end of the valley is formed in an arc shape, and the arc of the end of the valley is formed as a part of a circle inscribed in the valley and A threaded rebar characterized in that the portion, the mountain portion and the rib are connected to each other by a gently sloping surface. 3. A screw having two recesses, each of which has an inverted trapezoidal cross section of a male screw and is formed on an outer wall through ribs at predetermined pitches, and the ends of the recesses are formed in an arc shape. A threaded reinforcing bar joint characterized in that reinforcing bars are connected by a coupler, lock nuts are tightened at both ends of the coupler, and a filler is filled and hardened in a gap between the threaded reinforcing bar and the coupler. 4. A large-diameter threaded reinforcing bar in which outer walls are provided with troughs each having a cross-section of an inverted trapezoidal recess of an external thread via ribs at predetermined pitches, and the ends of the troughs are formed in an arc shape. And a small-diameter screw rebar are connected by a coupler, lock nuts are tightened at both ends of the coupler, and a filling material is filled and cured in a gap between the large-diameter screw rebar and the small-diameter screw rebar and the coupler. And screw rebar joints.