Fastening member and external wall construction structure

Abstract

A fastening member is formed out of one steel sheet to comprise: a base plate portion constituting amount portion to be fixed to a building frame; a right support portion, a left support portion, a central support portion and a lower support portion that fix stably the exterior wall boards; a central horizontal raised portion and a downwardly bent portion that lock shiplap portions of an exterior wall board disposed below the fastening member; bearing portions and upper-board locking portions that lock the shiplap portions of exterior wall boards that are disposed above the fastening member; upwardly bent portions; and front plate portions. A waterproof material made of bentonite is provided at the left and right ends of the central horizontal raised portion, the top surfaces of the upwardly bent portions and the front surfaces of the front plate portions.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a fastening member used for fastening exterior wall boards to a structural building frame, and to an external wall construction structure using the fastening member.[0003]2. Description of the Related Art[0004]As illustrated in FIG. 16, exterior wall boards include exterior wall boards A having shiplap portions at least at the upper edge and the lower edge. To construct the exterior wall of a building with exterior wall boards A, fastening members are used to fasten a plurality of such exterior wall boards to the building frame of the building in a staggered joint layout (for instance, as disclosed in Japanese Patent Application Laid-open No. 2002-371689). FIG. 17 illustrates a fastening member disclosed in Japanese Patent Application Laid-open No. 2002-371689. The fastening member, which is formed by bending a steel sheet, comprises a base plate portion that abuts the back surface of ex...

AI Technical Summary

Benefits of technology

[0017]The fastening member of the present invention can be reliably fixed to a building frame by way of the base plate portion that constitutes amount portion to be fixed to the building frame. The left support portion, the right support portion, the central support portion and the lower support portion allow the exterior wall board to be fixed stably through abutting of the fastening member against the back surface of the exterior wall board when the board is fastened. The central horizontal raised portion and the downwardly bent portion allow locking the shiplap portion of the upper edge of the exterior wall board that is disposed below the fastening member, while the bearing portions and the upper-board locking portions allow locking the shiplap portions of the lower edges of the exterior wall boards that are disposed above the fastening member.

[0028]When using a fastening member in which the downwardly bent portion and / or the central horizontal raised portion are coated in a blackish color or have a blackish tape adhered thereto, the downwardly bent portion and / or the central horizontal raised portion in the external wall construction structure are less likely to corrode or deteriorate.

Problems solved by technology

However, there are limits to the precision with which the exterior wall boards are put up, and therefore it is difficult to avoid completely the presence of gaps between the exterior wall boards and the elastic material in such an external wall construction structure.

As a result, elasticity may become impaired and gaps may grow in size as time goes by.

Although the fastening stopper of Japanese Patent Application Laid-open No. 2002-371689 allows preventing left-right shifting of the exterior wall boards that are disposed below the fastening stopper, the latter is ineffective against contraction of the exterior wall boards themselves or against distortion of the entire structure onto which the exterior wall boards are mounted, so that gaps may form at seams between exterior wall boards.

Moreover, the uncovered central horizontal raised portion and the downwardly bent portion become then exposed to rain, sunlight and the like at all times, which may result in corrosion and deterioration of the metal sheet.

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