JP2006348587A - Beam through hole reinforcing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a beam through hole reinforcing member having excellent strength and tenacity and low in cost with no internal defects, by forming it by centrifugal casting. <P>SOLUTION: The beam through hole reinforcing member 1 is formed in ring shape of approximately perfect circle and provided with a through hole 5 at the center part. The beam through hole reinforcing member 1 is formed using a centrifugal casting device 21. Specifically, molten metal 29 is injected into a body 23 of the centrifugal casting device 21, and the body 23 is rotated. At this time, the molten metal 29 is pressed to the inner periphery of the body 23 (a sand mold 27) by centrifugal force, and when the molten metal 29 is cooled and solidified, the beam through hole reinforcing member constant in radial thickness is formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a beam through hole reinforcing material for reinforcing a through hole of a steel beam.

H-shaped steel, I-shaped steel, and the like are widely used as beams for building structures, but in such beams, there are cases where through holes are formed to pass piping provided inside the building structure. is there.
At this time, in order to prevent a decrease in strength due to the formation of the through hole, a reinforcing metal fitting may be attached to the through hole.

As the reinforcing metal fittings, those having a plate-like shape mainly having through holes are used, and these are attached around the through holes by welding or the like. Further, a beam through hole reinforcing material having the following ring shape is also known. (Patent Document 1).
JP 2003-232105 A

  However, since the beam through-hole reinforcing material having a ring shape is manufactured by casting, casting defects often occur, resulting in poor yield and high cost.

  This invention is made | formed in view of such a problem, The objective is to provide a low-cost beam through-hole reinforcement material.

In order to achieve the above-described object, the first invention is a beam through-hole reinforcing material provided in a through-hole formed in a beam, has a point-symmetric ring shape with respect to the center, and has a diameter. The beam through-hole reinforcing material is characterized in that the cross section in the direction is uniform over the entire circumference and formed by centrifugal casting.
The beam through-hole reinforcing material may be formed by slicing and cutting a cylindrical ring formed by centrifugal casting in the axial direction, and may have a weld groove formed by machining.
The beam through-hole reinforcing material may have a positioning mark indicating the center in the vertical direction and the horizontal direction, and a rust preventive coating may be applied to a welded portion with the beam.

  A second invention is a method of manufacturing a beam through-hole reinforcing material provided in a through-hole formed in a beam, having a point-symmetric ring shape with respect to the center, and having a radial cross section around the entire circumference A beam through-hole reinforcing material is formed by centrifugal casting of a beam through-hole reinforcing material that is uniform over the entire area.

  In the present invention, the beam through-hole reinforcing material is formed by centrifugal casting.

  According to the present invention, a low-cost beam through-hole reinforcing material can be provided.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a longitudinal sectional view showing a beam through-hole reinforcing member 1 according to the first embodiment, and FIG. 2 is a view in the direction of arrow A in FIG. 3 is a view in the direction of arrow B in FIG.

As shown in FIGS. 1, 2, and 3, the main body 3 of the beam through-hole reinforcing member 1 has a substantially circular ring shape, and a through-hole 5 is provided at the center.
As shown in FIG. 2, marking lines 7a, 7b, 7c, and 7d are provided in the vicinity of the outer periphery of one surface as positioning marks indicating the center in the vertical direction and the horizontal direction.
The material of the beam through-hole reinforcing material 1 is cast steel or the like.
In addition, the beam through-hole reinforcing material 1 is manufactured by centrifugal casting as described later.

  Next, a method for attaching the beam through-hole reinforcing material 1 will be described with reference to FIGS. 4 and 5. 4 is a view showing the vicinity of the through hole 11 of the beam 9 before the beam through hole reinforcing material 1 is attached, and FIG. 5 is a diagram illustrating the beam through hole reinforcing material 1 and the beam after the beam through hole reinforcing material 1 is attached to the beam 9. FIG. 6 is a cross-sectional view taken along the line CC of FIG.

  As shown in FIG. 4, marking lines 13 a, 13 b, 13 c, and 13 d are provided as positioning marks in the vicinity of the outer periphery of the through hole 11 provided in the beam 9. At the time of attachment, as shown in FIG. 5, the marking lines 7a, 7b, 7c, and 7d of the beam through-hole reinforcing member 1 and the marking lines 13a, 13b, 13c, and 13d of the through-hole 11 are attached together. .

As shown in FIG. 6, after the beam through-hole reinforcing material 1 is attached to the beam 9, welding is performed, and the beam through-hole reinforcing material 1 is fixed to the beam 9 by the welded portion 15.
In FIG. 6, only one side of the beam 9 is welded, but both sides may be welded.
Thus, by providing the beam through-hole reinforcing material 1 in the through-hole 11 provided in the beam 9, the strength and rigidity of the beam penetration portion can be increased.

  Here, the manufacturing method of the beam through-hole reinforcing material 1 is demonstrated. FIG. 7 is a perspective view showing a centrifugal casting apparatus 21 used for manufacturing the beam through-hole reinforcing material 1, and FIG. 8 is a cross-sectional view of FIG. 9 to 12 are diagrams showing a procedure for manufacturing the beam through-hole reinforcing members 1, 30a, 30b, 30c, and 30d.

  As shown in FIG. 7, the centrifugal casting apparatus 21 includes a cylindrical main body 23 and rollers 25a, 25b, 25c, and 25d provided so as to be in contact with the main body 23. The rollers 25a, 25b, 25c, and 25d are illustrated in FIG. It is possible to rotate in the directions D1, D2, E1, and E2. The main body 23 rotates in the direction F in FIG. 7 when the rollers 25a, 25b, 25c, and 25d rotate.

As shown in FIG. 8, the main body 23 has a hollow cylindrical shape, and the inner periphery is covered with a sand mold 27 for heat insulation.
The main body 23 has an injection port 23a for injecting the molten metal 29 as shown in FIG.

Next, the manufacturing procedure of the through hole reinforcing material 1 will be described.
First, the main body 23 is rotated in the F direction by rotating the rollers 25a, 25b, 25c, and 25d of the centrifugal casting apparatus 21 in the directions D1, D2, E1, and E2 in FIG.
Next, the molten metal 29 is injected from the injection port 23a.
The molten metal 29 is obtained by heating and melting the material of the through hole reinforcing material at a high temperature.

At this time, since the main body 23 is rotating, the molten metal 29 is pressed against the main body 23 (sand mold 27) by centrifugal force as shown in FIG. 9, and when the molten metal 29 cools and hardens, the radial direction as shown in FIG. A cylinder 30 having a constant thickness is formed.

  Even when impurities are present in the molten metal 29, the impurities usually have a lighter specific gravity than the molten metal 29, so that they float on the inner periphery of the cylinder 30. Therefore, it is possible to remove this easily by polishing the surface, and no defects remain inside as in the casting, and the strength and toughness are high.

  Finally, as shown in FIG. 11, the axial thickness is adjusted by slicing and cutting the cylinder 30 in the axial direction to obtain the beam through-hole reinforcing members 1, 30a, 30b, 30c, and 30d as shown in FIG. be able to.

  Thus, according to the first embodiment, the beam through-hole reinforcing material 1 is manufactured by centrifugal casting. Therefore, there are few defects of the beam through-hole reinforcing material 1, strength and toughness are high, and the cost is further reduced.

  Next, a second embodiment will be described. FIG. 13 is a longitudinal sectional view showing a beam through-hole reinforcing material 31 according to the second embodiment, and FIG. 14 is a view in the direction of the arrow H in FIG. FIG. 15 is a view taken in the direction of the arrow I in FIG. Further, FIG. 16 is a detailed view of the vicinity of the weld groove portion 37 of FIG.

  The beam through-hole reinforcing material 31 in the second embodiment is a beam through-hole reinforcing material 1 in the first embodiment provided with a weld groove 37.

  As shown in FIGS. 13, 14, and 15, the main body 33 of the beam through-hole reinforcing member 31 has a substantially circular ring shape, and has a thin flange portion 39 on the outer peripheral portion. A welding groove portion 37 that is a taper portion is provided between the body 39 and the main body 33. A through hole 35 is provided at the center.

Further, as shown in FIG. 14, marking lines 41a, 41b, 41c, and 41d are provided near the outer periphery of one side as positioning marks indicating the center in the vertical direction and the horizontal direction.
The material of the beam through-hole reinforcing material 31 is cast steel or the like.

The beam through-hole reinforcing material 31 is manufactured by centrifugal casting as in the first embodiment, but the weld groove 37 is formed by machining after centrifugal casting.
Since the specific process of centrifugal casting is the same as that of the beam through-hole reinforcing material 1, the description thereof is omitted.

Further, as shown in FIG. 16, a rust preventive coating 43 is applied to the weld groove portion 37 and the surface of the flange portion 39 that contacts the weld groove portion 37.
Since these surfaces are surfaces to be welded when they are attached to a beam, which will be described later, by applying a rust preventive coating 43 to prevent rusting, it is possible to save the trouble of removing rust and to cause defects during welding. Can be prevented.

  Next, a method for attaching the beam through-hole reinforcing material 31 will be described with reference to FIGS. 17 and 18. 17 is a view showing the beam through-hole reinforcing material 1 and the beam 9 after the beam through-hole reinforcing material 1 is attached to the beam 9, and FIG. 18 is a cross-sectional view taken along line JJ in FIG.

  At the time of attachment, as shown in FIG. 17, the marking lines 41a, 41b, 41c, and 41d of the beam through-hole reinforcing member 31 and the marking lines 13a, 13b, 13c, and 13d of the through-hole 11 are fitted together. .

As shown in FIG. 18, after attaching the beam through-hole reinforcing material 31 to the beam 9, the through-hole 11, the weld groove portion 37, and the surface of the flange portion 39 that contacts the weld groove portion 37 are welded and welded. The beam through-hole reinforcing material 31 is fixed to the beam 9 by the portion 45.
Thus, the strength of the welded portion 45 can be increased by providing the weld groove portion 37. Moreover, weldability improves and generation | occurrence | production of a welding defect can be suppressed.

  Thus, according to the second embodiment, the beam through-hole reinforcing material 31 is manufactured by centrifugal casting. Therefore, the beam through-hole reinforcing material 31 has few defects, high strength and toughness, and low cost.

  In addition, according to the second embodiment, the beam through-hole reinforcing material 31 has the weld groove portion 37, and the strength of the weld portion 45 can be increased.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

Longitudinal section showing beam through-hole reinforcement 1 1. A direction arrow view of FIG. B direction arrow view of FIG. The figure which shows the through-hole 11 vicinity of the beam 9 before attaching the beam through-hole reinforcement 1 The figure which shows the beam through-hole reinforcement 1 and the beam 9 after attaching the beam through-hole reinforcement 1 to the beam 9 CC sectional view of FIG. The perspective view which shows the centrifugal casting apparatus 21 Cross section of FIG. Beam through-hole reinforcing material Diagram showing a procedure for manufacturing beam through-hole reinforcing material 1, 30a, 30b, 30c, 30d Beam through-hole reinforcing material Diagram showing a procedure for manufacturing beam through-hole reinforcing material 1, 30a, 30b, 30c, 30d Beam through-hole reinforcing material Diagram showing a procedure for manufacturing beam through-hole reinforcing material 1, 30a, 30b, 30c, 30d Beam through-hole reinforcing material Diagram showing a procedure for manufacturing beam through-hole reinforcing material 1, 30a, 30b, 30c, 30d Longitudinal sectional view showing beam through-hole reinforcing material 31 H direction arrow view of FIG. I direction arrow view of FIG. Detailed view of the vicinity of the weld groove 37 in FIG. The figure which shows the beam through-hole reinforcement 1 and the beam 9 after attaching the beam through-hole reinforcement 1 to the beam 9 JJ sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ………… Beam through-hole reinforcement 3 ………… Main body 5 ………… Through hole 7a ………… Marking line 9 ………… Beam 11 ……… Through hole 13a …… Marking line 15… …… Welding part 21 ………… Centrifuge casting device 23 ………… Main body 25 ………… Roller 27 ……… Sand mold 31 ……… Beam through hole reinforcing material 33 ……… Main body 35 ……… Through hole 37 ……… Weld groove 39 ......... Flange part 41a ...... Mark line 43 ......... Rust-proof coating 45 ......... Welded part

Claims (6)

A beam through hole reinforcing material provided in a through hole formed in a beam,
A beam through-hole reinforcing material having a point-symmetrical ring shape with respect to the center and having a uniform radial cross section over the entire circumference and formed by centrifugal casting.   The beam through-hole reinforcing material according to claim 1, wherein the beam through-hole reinforcing material is formed by slicing and cutting a cylindrical ring formed by centrifugal casting in an axial direction.   The beam through-hole reinforcing material according to claim 1, wherein the beam through-hole reinforcing material has a weld groove formed by machining.   The beam through-hole reinforcing material according to any one of claims 1 to 3, wherein the beam through-hole reinforcing material has a positioning mark indicating a center in a vertical direction and a horizontal direction.   The beam through-hole reinforcing material according to any one of claims 1 to 4, wherein the beam through-hole reinforcing material has an anticorrosive coating applied to a welded portion with the beam. A method for manufacturing a beam through-hole reinforcing material provided in a through-hole formed in a beam,
Manufacturing of a beam through-hole reinforcing material, characterized by forming a beam through-hole reinforcing material having a point-symmetric ring shape with respect to the center and having a uniform radial cross section over the entire circumference by centrifugal casting Method.

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