A metal joint adapted to be fitted into a hole formed in a building component and fixed to the hole with an adhesive includes: a small diameter portion having an elongated shape and an outer diameter smaller than an inner diameter of the hole; and two large diameter portions fixed to the small diameter portion individually at two locations spaced apart from each other in a longitudinal direction of the small diameter portion, each large diameter portion having an outer diameter corresponding to the inner diameter of the hole. Furthermore, irregularities are formed on an outer peripheral surface of the small diameter portion in a section between the two large diameter portions.
1. A metal joint adapted to be fitted into a hole formed in one end surface of a building component having an elongated shape and fixed to the hole with an adhesive, the metal joint comprising:
a small diameter portion having an elongated shape and an outer diameter smaller than an inner diameter of the hole; and
two large diameter portions fixed to the small diameter portion individually at two locations spaced apart from each other in a longitudinal direction of the small diameter portion, each large diameter portion having an outer diameter corresponding to the inner diameter of the hole, each of the large diameter portions comprising a spring ring, each spring ring having an outer diameter larger than the inner diameter of the hole, each spring ring being configured to retain a position with respect to the hole by elastic force,
wherein irregularities are formed on an outer peripheral surface of the small diameter portion in a section between the two large diameter portions,
the hole for fitting the metal joint being formed in the one end surface of the building component, the building component also having an adhesive injection hole and an adhesive fill check hole, both of which communicate with the hole for fitting the metal joint, and both of which are formed in a same side surface of the building component, the adhesive injection hole disposed below the adhesive fill check hole in a direction extending from the one end surface towards a bottom of the hole;
the metal joint being configured to be fit into the hole formed in the building component until reaching a predetermined position;
the adhesive injection hole being configured to receive the adhesive into a gap between the small diameter portion of the metal joint and the building component; and
the adhesive fill check hole being configured to receive outflow of the adhesive out of the gap.
2. The metal joint according to claim 1 , wherein the large diameter portions are fixed at opposite longitudinal ends of the small diameter portion.
3. The metal joint according to claim 1 , wherein the irregularities comprise an external thread.
4. The metal joint according to claim 1 , wherein the irregularities comprise a plurality of annular rings.
5. The metal joint according to claim 1 , wherein the irregularities comprise a plurality of protrusions and/or recesses.
6. The metal joint according to claim 1 , wherein the small diameter portion has a segment with a circumferential surface having an outer diameter smaller than the outer diameter of the small diameter portion, the segment being obtained by dividing the section of the small diameter portion between the two large diameter portions in the longitudinal direction of the small diameter portion.
7. The metal joint according to claim 1 , wherein an internal thread is formed on a surface of one longitudinal end of the small diameter portion.
8. The metal joint according to claim 1 , wherein a joining portion having an external thread in at least a distal end section thereof is coupled onto a surface of one longitudinal end of the small diameter portion.
9. The metal joint according to claim 8 , wherein the joining portion is integrally coupled to the small diameter portion.