Reinforcement steel
a technology of reinforcement steel and reinforcement plate, which is applied in the direction of building reinforcements, constructions, building components, etc., can solve the problem of low anchoring force of the head part to the concrete, and achieve the effect of increasing the strength of the deck, and reducing the weight of the structur
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first embodiment
[0028]As shown in FIG. 1, a reinforcement steel bar 1A of a first embodiment is deformed reinforcement steel made of steel. The reinforcement steel bar 1A includes a shaft part 10 and a head part 20 formed at a front end portion of the shaft part 10.
[0029]The shaft part 10 is formed by providing grid ribs 11 on an outer peripheral surface of a rod-shaped member having a circular cross section. Accordingly, the ribs 11 form asperities on the outer peripheral surface of the shaft part 10.
[0030]As shown in FIG. 2A, the head part 20 is formed at the front end portion of the shaft part 10. The head part 20 is a forged region of the front end portion of the shaft part 10. In other words, the shaft part 10 and the head part 20 constitute an integrated member.
[0031]The head part 20 has a larger diameter than that of the shaft part 10. In the first embodiment, the entire head part 20 projects from the shaft part 10 in a radial direction of the shaft part 10.
[0032]The head part 20 of the firs...
second embodiment
[0067]Next, a reinforcement steel bar 1B of a second embodiment will be described.
[0068]As shown in FIG. 4A, the reinforcement steel bar 1B of the second embodiment has substantially the same configuration as that of the reinforcement steel bar 1A of the above-described first embodiment (see FIG. 1), except that the shapes of the head parts 20 are different from each other.
[0069]In the reinforcement steel bar 1B of the second embodiment, a flat surface 27 is formed on the head part 20. As shown in FIG. 4B, a direction orthogonal to the axial direction of the shaft part 10 is defined as a normal direction of the flat surface 27.
[0070]In the reinforcement steel bar 1B, a distance L3 (a distance in the radial direction of the shaft part 10) from the shaft center (the axis) of the shaft part 10 to the flat surface 27 is substantially equal to the radius of the shaft part 10.
[0071]Note that the distance L3 in the radial direction of the shaft part 10 from the shaft center of the shaft pa...
third embodiment
[0079]Next, a reinforcement steel bar 1C of a third embodiment will be described.
[0080]As shown in FIG. 6A, the reinforcement steel bar 1C of the third embodiment has substantially the same configuration as that of the reinforcement steel bar 1B of the above-described second embodiment (see FIG. 4A), except that the shapes of the head parts 20 are different from each other. In the reinforcement steel bar 1C of the third embodiment, two flat surfaces 27 are formed on the head part 20.
[0081]In the third embodiment, the two flat surfaces 27 formed on the head part 20 are formed substantially parallel to each other while interposing the center of the head part 20 in between as shown in FIG. 6B.
[0082]Meanwhile, in the third embodiment, the front end surface 21 is formed into a rectangle in front view as shown in FIG. 6C. When the front end surface 21 is formed into the rectangle as described above, it is possible to increase an axial cross-sectional area of the head part 20 and thus to i...
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