Nippon Steel Corporation

Fuji Hollow Valve Inc.

Yasushi Maeda

Kazuaki Suzuki

Toru Takeuchi

Akira Wada

Ken Okada

Satoshi Yamada

Tooru Takeuchi

Takahiro Karita

An umbrella part metallic sodium insertion device for inserting rod-shaped metallic sodium into a hollow part of a hollow valve; a melting device for melting the metallic sodium in the hollow part by inserting a push rod from an opening into the hollow part of the hollow valve, in which the metallic sodium has been inserted by the device, and, while pushing the rod-shaped metallic sodium in the hollow part, heating the umbrella part to a temperature at which the metallic sodium is melted; a stem part cooling device for cooling a stem part of the hollow valve, in which the metallic sodium has been melted by the melting device, to a temperature lower than the temperature at which the metallic sodium is melted; and a stem part metallic sodium insertion device for inserting rod-shaped metallic sodium into the hollow part which has been cooled by the device.

Method and device for manufacturing metallic-sodium-filled engine valve

A joint structure includes a splice plate and a gusset plate, which can prevent out-of-plane buckling of the gusset plate without the necessity of welding a stiffening rib plate thereon. The joint structure includes a gusset plate and at least one splice plate connected to the gusset plate. Each of the splice plates is constructed from section steel having a non-rectangular cross-section. The joint structure can be used in a building during assembly of the building or for reinforcement of the building.

Joint structure using a gusset plate, a building using the joint structure and a method of assembling or reinforcing a building

A column-and-beam join structure comprises connecting the column and beam with a pair of split tees. At least one split tee has a web with a portion of the web having a reduced cross-sectional area. The web with the reduced cross-sectional area is located between a flange of the beam and a buckling restraint. The buckling restraint is connected to the flange of the beam with bolts. The sides of the bolts are in the proximity to the side surface of the portion of the web of the split tee having the reduced cross-sectional area. Annular members may be arranged surrounding portions of the bolts that are in proximity to the side surface of the portion of the web having the reduced cross-sectional area.

Column-and-beam join structure

The present invention provides a column-and-beam join structure which absorbs energy caused by a large earthquake or the like by split tees surely yielding at a prescribed value, does not cause other members to fracture, and thus makes it possible to replace only the split tees which have become unusable, and, more specifically, a column-and-beam join structure constructed by attaching and connecting, using bolts the ends of both the upper and lower flanges of a steel beam (H-shaped steel beam) between the webs of a pair of upper and lower split tees the flanges of which are connected to a steel column using bolts The upper limit of the yield stress of the steel material used for the split tees is defined to be not more than twice the lower limit thereof. Further, in order for the web extending from the flange of a split tee in the axial direction of an H-shaped steel beam to absorb earthquake energy by its plasticization, the cross-sectional area of the web is reduced partially and the base end portion of the web is divided from the tip portion which is connected to the flange of the H-shaped steel beam

Growing community of inventors

Tokyo, Japan

Yasushi Maeda