Abstract: In a column end joint structure for joining an end of a column made of flat wooden material having a rectangular cross-section to a joining member, splitting generation at the end of the column is controlled. An expansion of crack is controlled when splitting generated. A cutout portion is provided in each of ends in a longitudinal direction of a column end face, and a joint fitting is coupled inside the cutout portion by a joint bolt. The joint fitting is coupled to a foundation by an anchor bolt. Joint fittings are arranged in the longitudinal direction of the end face inside each cutout portion. One joint fitting is located contacting or close to a surface of the column inside the cutout portion such that the joint fitting side face and the surface of the column inside the cutout portion restrain a displacement orthogonal to the column axis.

Abstract: Disclosed is a coupling member that enables a joint between a wooden member and a mating member to absorb vibration energy, and a method for producing the same and a joint structure using the same. The metal coupling member is embedded in the wooden member. The wooden member is connected with a mating member by the coupling member. The coupling member includes a metal rod-like main body portion to be embedded in the wooden member, and an inner rod portion protruding from the main body portion. The inner rod portion axially extends from a protruding portion thereof to a predetermined depth in the main body portion, has a periphery separated from the main body portion to allow axial displacement of the inner rod portion relative to the main body portion, and is integrally connected to the main body portion at the deepest part thereof.

Abstract: A wooden member joint structure having high strength against load repeatedly applied in opposite directions, with improved work efficiency in joining the wooden member to a mating member. A screw member having spiral protrusion on its outer peripheral surface and an axial hollow hole is threaded axially into a wooden column. A distal end of joint bolt is threadedly engaged with bottom of the hollow hole. The joint bolt has an integrally formed flange, and the flange is threaded into the column together with the screw member with its contact surface firmly pressed against end face of the screw member. A joint device is clamped between a fastening nut threadably mounted on a proximal end of the joint bolt and the flange and coupled to the screw member via the joint bolt. The joint device is secured to a foundation by an anchor bolt protruding therefrom and a fastening nut.

Abstract: In a column base joint structure, an anchor bolt and a column installed upright on a groundsel are tightly joined using groundsel-side and column-side hardware pieces. The groundsel-side hardware piece includes groundsel-embedded and upper fitting tenon portions. A fitting hole for the upper fitting tenon portion of the groundsel-side hardware piece is formed in a base of the column. The column-side hardware piece includes a lower projecting portion projecting downward from a top face portion to the inside of the fitting hole, and a column-embedded portion positioned above the top face portion. A pin locking hole in the upper fitting tenon portion of the groundsel-side hardware piece and a pin locking hole in the lower projecting portion of the column-side hardware piece are mutually aligned, a driftpin is hammered into the aligned pin locking holes, and the anchor bolt and the column are thereby tightly joined to each other.

Abstract: The wooden building skeleton of the present invention has excellent quake resistance because the column of a rigid-frame structure joined to a cross member or the foundation so that a bending moment can be transferred therebetween and the load-bearing wall therein exhibit their load bearing ability. A foundation and a wooden column and the wooden column and a beam are respectively joined by two bolts so that a bending moment can be transferred therebetween. A load-bearing wall is also provided between the beam and the foundation. The length of the section of the bolts which undergoes elongation when inter-story deflection occurs between the beam and the foundation or the cross-sectional dimensions of the wooden column is set such that the inter-story deflection which is generated before the wooden column is fractured is almost equal to or greater than the inter-story deflection which is generated before the load-bearing wall is fractured.

Abstract: Provided is a production method for particle boards or fiber boards which achieves production efficiency greater than that of conventional production methods. A production method for a particle board or a fiber board, comprising the step of adding polycarboxylic acid into a plant-derived product that has been segmented or formed into fibers, and further comprising the step of adding a small amount a compound having one or more types of an isocyanate group to the plant-derived product and/or the polycarboxylic acid.

Abstract: Wooden member to be easily joined to another member, with good appearance of decreased size fixation structure for tensile member to improve the load bearing performance. Metal screw members including cylindrical shaft portions having an axial direction through hole and blade spirally protruding from the shaft portion are axially threaded into wooden member at two locations. Groove or hollow hole is between the two screw members, and steel rod extends from the through hole of one of the screw members through the groove or hollow hole into the through hole of the other. Both ends of the steel rod with tensioning force are locked to the screw member by nuts. Cutout recesses are formed in the wooden member, and the screw members are threaded into the wooden member through the recesses and the steel rod is locked to the screw members.

Abstract: Wooden member to be easily joined to another member, with good appearance of decreased size fixation structure for tensile member to improve the load bearing performance. Metal screw members including cylindrical shaft portions having an axial direction through hole and blade spirally protruding from the shaft portion are axially threaded into wooden member at two locations. Groove or hollow hole is between the two screw members, and steel rod extends from the through hole of one of the screw members through the groove or hollow hole into the through hole of the other. Both ends of the steel rod with tensioning force are locked to the screw member by nuts. Cutout recesses are formed in the wooden member, and the screw members are threaded into the wooden member through the recesses and the steel rod is locked to the screw members.

Abstract: The wooden building skeleton of the present invention has excellent quake resistance because the column of a rigid-frame structure joined to a cross member or the foundation so that a bending moment can be transferred therebetween and the load-bearing wall therein exhibit their load bearing ability. A foundation and a wooden column and the wooden column and a beam are respectively joined by two bolts so that a bending moment can be transferred therebetween. A load-bearing wall is also provided between the beam and the foundation. The length of the section of the bolts which undergoes elongation when inter-story deflection occurs between the beam and the foundation or the cross-sectional dimensions of the wooden column is set such that the inter-story deflection which is generated before the wooden column is fractured is almost equal to or greater than the inter-story deflection which is generated before the load-bearing wall is fractured.

Abstract: A wooden member joint structure having high strength against load repeatedly applied in opposite directions, with improved work efficiency in joining the wooden member to a mating member. A screw member having spiral protrusion on its outer peripheral surface and an axial hollow hole is threaded axially into a wooden column. A distal end of joint bolt is threadedly engaged with bottom of the hollow hole. The joint bolt has an integrally formed flange, and the flange is threaded into the column together with the screw member with its contact surface firmly pressed against end face of the screw member. A joint device is clamped between a fastening nut threadably mounted on a proximal end of the joint bolt and the flange and coupled to the screw member via the joint bolt. The joint device is secured to a foundation by an anchor bolt protruding therefrom and a fastening nut.

Abstract: A nut comprises a metal member including a nut body having an internally threaded portion formed therein and an extension formed on one end of the nut body so as to surround an opening of the internally threaded portion, the metal member being subjected to surface treatment; and a ring member made of a synthetic resin, having an outer peripheral portion united with an inner side of the extension and having a ring inner diameter substantially equal to a minor diameter of the internally threaded portion, the outer peripheral portion being united with the inner side of the extension by insert-molding using the metal member as an insert; wherein the extension has at least one recess formed in an inner portion, and the outer peripheral portion has a rotation-preventing portion fit into the at least one recess, the rotation-preventing portion being formed by the insert molding.

Abstract: Provided is a production method for particle boards or fiber boards which achieves production efficiency greater than that of conventional production methods. A production method for a particle board or a fiber board, comprising the step of adding polycarboxylic acid into a plant-derived product that has been segmented or formed into fibers, and further comprising the step of adding a small amount a compound having one or more types of an isocyanate group to the plant-derived product and/or the polycarboxylic acid.

Abstract: A beam-column connection structure is formed, after installing a continued beam member to a predetermined position, by connecting and fixing lateral beam members, to side faces of an end portion of the continued beam member using a drift pin while connection grooves are fitted to side face connection metal fittings which are attached to the end portion, connecting an extension beam member to the end portion of the continued beam member using a drift pin while a connection groove formed at an end face of the extension beam member is fitted to the end face connection metal fitting, and connecting and fixing column members, to the upper face and lower face of the end portion of the continued beam member using a drift pin while fitting holes, formed at end faces of the column members, are fitted to the top end side portions of column connection pole-like fittings.

Abstract: A beam-column connection structure is formed, after installing a continued beam member to a predetermined position, by connecting and fixing lateral beam members, to side faces of an end portion of the continued beam member using a drift pin while connection grooves are fitted to side face connection metal fittings which are attached to the end portion, connecting an extension beam member to the end portion of the continued beam member using a drift pin while a connection groove formed at an end face of the extension beam member is fitted to the end face connection metal fitting, and connecting and fixing column members, to the upper face and lower face of the end portion of the continued beam member using a drift pin while fitting holes, formed at end faces of the column members, are fitted to the top end side portions of column connection pole-like fittings.