JP5474411B2 - Ring steel for building structures - Google Patents

Description

  The present invention relates to a ring steel material for a building structure that is used to reinforce a web through hole that is formed in a steel beam and is provided to allow piping and the like to pass therethrough.

Conventionally, there is JP, 2007-120016, A as a technique of such a field. The steel beam reinforcing hardware (ring steel material for building structure) described in this publication is formed in a ring shape having a center hole, and the diameter of the center hole has a size matched with the web through hole of the steel beam. ing. Furthermore, an insertion hole for penetrating the bolt is formed in the reinforcing hardware. Such reinforcement hardware is fixed to the steel beam with bolts and nuts, but as the number of insertion holes increases, the number of bolts and nuts increases, the number of parts increases, and workability deteriorates. In the case of manual tightening, the variation in the tightening torque of the nut also increases.
Therefore, as shown in FIG. 8, there is known a reinforcing hardware 100 that can be joined to a steel beam by welding without using bolts or nuts. In such a reinforcing hardware 100, although a welding tool is required, it contributes to the improvement of workability.

JP 2007-120016 A

  However, since the conventional steel beam reinforcing hardware (ring steel material for building structure) 100 described above is simply formed with a weld hole 102 in a ring-shaped main body portion 101 having a uniform thickness as shown in FIG. If the thickness of the main body portion 101 is reduced for weight reduction, the welding hole 102 cannot maintain the depth necessary for maintaining the welding strength, and if the depth of the welding hole 102 is increased, the main body portion 100 is Since it will become thick, there exists a problem of causing the weight increase.

  An object of the present invention is to provide a ring steel material for a building structure that is reduced in weight while maintaining welding strength.

The present invention is a ring steel material for a building structure formed in a ring shape with an inner periphery and an outer periphery,
A weld receiving part formed as a ring-shaped groove having a concave cross section between the inner peripheral part and the outer peripheral part;
A weld hole formed in the bottom surface of the weld housing;
Flange portions respectively formed on the inner peripheral portion side and the outer peripheral portion side;
A bottom portion extending between the flange portions;
With
The flange part on the inner peripheral part side and the flange part on the outer peripheral part side each have a trapezoidal cross section, and the thickness of the bottom part is thinner than the thickness of the base end side of each flange part,
It is characterized in that welding is performed so that the periphery of the welded portion of the welded portion that is plug-welded in the weld hole reaches the bottom surface of the weld receiving portion.

  In the ring steel material for building structures according to the present invention, a weld receiving portion and a weld hole that contribute to welding are formed, and the weld receiving portion is a concave groove with a ring shape between the inner peripheral portion and the outer peripheral portion. A predetermined number of welding holes are formed on the bottom surface of the welding housing portion. In this way, as a result of forming the weld housing part as a ring-shaped groove having a concave cross section between the inner peripheral part and the outer peripheral part, welding is performed between the weld housing part and the inner peripheral part on the appearance of the ring steel material. A ring-shaped flange part will be formed between the housing part and the outer peripheral part. Even if the thickness between the flange parts is thin with ring steel, the flange part is sufficient in the vicinity of the inner peripheral part and the outer peripheral part. Since sufficient strength is ensured and it can function as a reinforcing material, the rigidity of the ring steel material is ensured. Furthermore, when the web through-hole formed in the steel beam and through which piping is passed is in a high place, the ring steel must be transported to a high place, and the weight of the ring steel is a burden on the work. Since it has a great influence, it is possible to easily reduce the weight of the ring steel material without reducing the rigidity of the ring steel material more than necessary by deepening the welding accommodating portion, and the handling property is improved accordingly. In addition, in high-altitude work, the scaffold may be limited, so it is necessary to make it easy to check the welding state. Therefore, in the ring steel material according to the present invention, the periphery of the welded portion that has been built up with the weld hole reaches the bottom surface of the welded housing portion. It becomes easy to check the quality of the welded portions scattered in the part, and it is also easy to check the surplus height. Moreover, without increasing the diameter of the entire weld hole, it is easy to aim at the weld hole during welding, and the occurrence of welding defects can be reliably prevented.

In addition, it is preferable that another welded portion extending from the inner peripheral portion to the outer peripheral portion is provided.
In manufacturing the ring steel material having such a configuration, first, a belt-shaped steel material is wound around a drum to form a spiral steel material, and then a C-shaped steel material is manufactured by cutting from the outer periphery to the inner periphery in the radial direction. Then, these two ends are butted and welded. Such manufacturing enables mass production of ring steel.

  According to the present invention, it is possible to reduce the weight while maintaining the welding strength.

(A) is a perspective view which shows the state before welding the ring steel material for building structures which concerns on this invention to a beam, (b) is a perspective view which shows the state after welding the ring steel material for building structures to a beam. is there. It is a perspective view which shows one Embodiment of the ring steel material for building structures which concerns on this invention. It is sectional drawing which follows the III-III line of FIG. (A) is a perspective view which shows a normal welding state, (b) is a perspective view which shows the state of poor welding. (A) is a perspective view which shows the strip | belt-shaped steel materials applied to manufacture of the ring steel materials for building structures based on this invention, (b) is a figure which shows the state by which the steel materials were wound around the drum. (C) is a perspective view showing a spiral steel material, (d) is a plan view showing an arcuate steel material, and (e) is a plan view showing an annular steel material. It is sectional drawing which shows other embodiment of the ring steel material for building structures which concerns on this invention. It is a perspective view which shows the conventional ring steel material for building structures.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a ring steel material for building structures according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a ring steel material 1 for a building structure is used to reinforce a web through hole 2 formed in a steel H-shaped steel beam A and provided for passing piping or the like. 2 (for example, 4 to 12 pieces) are arranged at equal intervals between the inner peripheral portion 1a having substantially the same diameter as the outer peripheral portion 2, the outer peripheral portion 1b having a predetermined outer diameter, and the inner peripheral portion 1a and the outer peripheral portion 1b. Welding hole 1c.

  As a procedure for fixing the ring steel material 1 to the beam A, after aligning the web through hole 2 of the beam A and the inner peripheral portion 1a of the ring steel material 1, plug welding 3 is applied to the welding hole 1c, and the web The ring steel material 1 and the beam A are joined on one side. Further, another ring steel material 1 is also plug welded on the opposite side of the web of the beam A. When such a ring steel material 1 is used, it is not necessary to perform welding on the outer peripheral portion 1b of the ring steel material 1, and the amount of welding is small, so that the beam A is hardly affected by heat (distortion, shrinkage).

  An example of the ring steel material 1 has a shape with an outer diameter of 500 to 1000 mm, an inner diameter of 340 to 700 mm, and a thickness of 16 to 25 mm. The diameter of the weld hole 1c is 23 to 39 mm.

  The ring steel material 1 will be described in more detail.

  As shown in FIGS. 2 and 3, the ring steel material 1 includes a weld housing portion 20 formed as a ring-shaped groove having a concave cross section between the inner peripheral portion 1 a and the outer peripheral portion 1 b, and Welding holes 1c formed at equal intervals on the bottom surface 20a, and as a result of forming the ring-shaped weld housing portion 20, on the appearance of the ring steel material, between the weld housing portion 20 and the inner peripheral portion 1a, Ring-shaped flange portions 21 and 22 are formed between the weld housing portion 20 and the outer peripheral portion 1b. And the circumference | surroundings of the surplus part B of the welding part 3 plug-welded in the welding hole 1c have reached the bottom face 20a of the welding accommodating part 20. FIG.

In ring steel material 1, so that contributes weld accommodating portion 20 to the welding and the weld hole 1c is formed between the inner peripheral portion 1a and the weld accommodating portion 20, the welding housing portion 20 and the outer peripheral portion 1b Even if the thickness of the bottom 23 between the flange portions 21 and 22 is thin due to the ring-shaped flange portions 21 and 22 between the flange portions 21 and 22, the flange portions 21 and 22 cause the inner peripheral portion 1 a vicinity and the outer peripheral portion 1 b vicinity. Thus, sufficient strength can be ensured and it can function as a reinforcing material, so that the rigidity of the ring steel material 1 is ensured.

  Furthermore, when the web through hole 2 of the steel beam A is in a high place, the ring steel material 1 must be transported to a high place, and the weight of the ring steel material has a great influence on the work load. By deepening the portion 20, it is possible to easily reduce the weight without reducing the rigidity of the ring steel material 1 more than necessary, and the handleability is improved accordingly.

  In addition, in high-altitude work, the scaffold may be limited, so it is necessary to make it easy to check the welding state. Therefore, in the ring steel material 1, the periphery of the surplus portion B reaches the bottom surface 20 a of the weld housing portion 20, but by adopting the ring-shaped weld housing portion 20, It is easy to check the quality of the scattered welded portions 3, and it is also easy to check the surplus height. In addition, without increasing the diameter of the entire weld hole 1c, it is easy to aim at the weld hole 1c during welding, and the occurrence of welding defects can be reliably prevented.

  For example, as shown in FIG. 4 (a), it is important that the welding hole 1c be plug welded so as not to be seen by the extra portion B, but as shown in FIG. 4 (b), plug welding is performed. Even if a part K of the weld hole 1c is exposed from the surplus portion B due to the deficiencies in the welded portion, it is easy to check visually because the weld receiving portion 20 is ring-shaped. Good.

  Furthermore, in the ring steel material 1 having the welded portion P extending from the inner peripheral portion 1a to the outer peripheral portion 1b, a manufacturing method described later is applied to enable mass production.

  Next, the manufacturing method of the ring steel material 1 will be described in detail.

  As shown in FIG. 5, carbon steel is a chemical component of C ≦ 0.20%, Si ≦ 0.55%, Mn ≦ 1.60%, P ≦ 0.035%, S ≦ 0.035% or less. A long strip steel material 10 having mechanical properties of yield point ≧ 320 Mpa, 490 Mpa ≦ tensile strength ≦ 610 Mpa, yield ratio ≦ 80%, elongation at break ≧ 17% is prepared.

  After that, the elongated strip-shaped steel material 10 is wound around the cylindrical drum 11 while shifting the thickness by one round, and is subjected to a cold bending process in a spiral shape. As shown in FIG. 6, the spiral steel material 12 that has been wound is detached from the drum 11, and then, along the one-dot chain line between the outer periphery and the inner periphery in the radial direction from the outer periphery to the inner periphery. And cut into a C-shaped arcuate steel material 13. According to such molding, the C-shaped arc-shaped steel material 13 can be efficiently molded.

  The bottom surface 15a of the welding accommodating portion 15 in the strip-shaped steel material 10 before the winding is formed so as to rise from the flange portion 21 positioned on the inner peripheral portion 1a side of the steel material 10 to the flange portion 22 positioned on the outer peripheral portion 1b side. It is formed as an inclined surface. This is because the steel material 10 is compressed toward the inner peripheral side when the steel material 10 is wound around the drum 11, and the bottom portion 13 c of the C-shaped arc-shaped steel material 13 (see FIG. 6D). This is to make the thickness uniform.

  Thereafter, both end surfaces 13a of the cut portion S of the C-shaped arc-shaped steel material 13 are butted and welded to form an annular steel material 14 having a closed cross section. The butt welding method may be any method as long as both end surfaces 13a can be firmly joined, but flash butt welding is appropriate. According to this welding, it is not necessary to finish the both end faces 13a of the C-shaped arc-shaped steel material 13 smoothly for abutting, so that the welding process can be simplified. The symbol “P” is a welded portion.

  Further, the steel material 14 formed into an annular shape is subjected to a heat treatment at 740 ° C. to 900 ° C., and becomes a ring steel material 20 having predetermined quality characteristics that can be used as a material for building structures. A ring steel material 1 as a product is formed by drilling the ring steel material 20 to form a weld hole 1c (see FIG. 2).

  It goes without saying that the present invention is not limited to the embodiment described above. For example, as shown in FIG. 7, the flange portions 31 and 32 of the ring steel material 30 may be trapezoidal in cross section or semicircular in cross section. Because of these shapes, the weld housing part 20 spreads outward, so that the visual confirmation of the welded part 3 becomes better.

  DESCRIPTION OF SYMBOLS 1,30 ... Ring steel material for building structures, 1a ... Inner peripheral part, 1b ... Outer peripheral part, 1c ... Weld hole, 20 ... Weld accommodating part, 20a ... Bottom, 21, 22, 31, 32 ... Flange part, P ... Welding Department.

Claims (2)

In the ring steel material for building structures formed in a ring shape at the inner periphery and the outer periphery,
A weld receiving portion formed as a ring-shaped groove having a concave cross section between the inner peripheral portion and the outer peripheral portion;
A weld hole formed in the bottom surface of the weld housing portion;
Flange portions respectively formed on the inner peripheral portion side and the outer peripheral portion side;
A bottom portion extending between the flange portions;
With
The flange part on the inner peripheral part side and the flange part on the outer peripheral part side each have a trapezoidal cross section, and the thickness of the bottom part is thinner than the thickness of the base end side of each flange part,
A ring steel material for a building structure, wherein a periphery of a surging portion of a welded portion plug-welded in the weld hole is welded so as to reach the bottom surface of the weld receiving portion. The ring steel material for building structures according to claim 1, wherein another welded portion extending from the inner peripheral portion to the outer peripheral portion is provided.

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