| 摘要 |
PROBLEM TO BE SOLVED: To provide a beam through-hole reinforcement material inexpensive and easy to set in a through-hole formed in a beam material.SOLUTION: A ring-shaped reinforcement member 4 installed in a web of a beam is formed in an external appearance truncated cone shape by being taken out of a steel plate by gas cutting, laser cutting or plasma cutting. A plurality of web receiving projections 6 are formed in a stairs shape in at least a part of an inclined face 5 of the ring-shaped reinforcement member 4. The inclined face 5 of the ring-shaped reinforcement member 4 is allowed to abut on an inner surface of a through-hole 2 formed in a beam material 1, and a part between a large diameter side peripheral surface of the ring-shape reinforcement member 4 and a surface of a web 3 of the beam material 1, is welded and fixed. |
