Delta culvert

Claim 1

The constructional wall section of a tubular article in the form of a three-sided culvert, the said wall section fabricated by bonding together with a waterproof, cold setting, resorcinol-resin adhesive, a plurality of individual structural components, each of said structural components defined individually as an elongated member shaped as a regular right parallelipiped with square cross section; said member notched at one end only with a face width notch formed by two intersecting cuts, to wit, a first cut beginning at the edge intersection of an end and a face of the member and extending into the member, at an angle of thirty degrees relative the face plane of the member, for a distance sufficient to completely accept the unnotched end of a counterpart structural component member, the notch subsequently completed with a second cut perpendicular said first cut and extending from the bottom of the said first cut to the aforementioned member face with which face the plane of the said second cut will exhibit an angle of sixty degrees, all components with notched faces in the same plane, all adjacent components with notched ends and unnotched ends alternating, and all components with notched ends uniformly extending beyond adjacent component unnotched ends a distance substantially one-half the face width of a component, the term plurality for claim purposes in this application being restricted numerically to even whole numbers thereby to produce 3 separate constructional wall section groups, the groups namely a first group of at least two units composed of an even number of structural components, a second group of at least two units composed of structural components double in number the components of the first group and a third group composed of structural components triple in number the components of the first group.