Free standing wall structures

In a free standing longitudinal acoustical barrier wall structure constructed on a supporting surface and having an exoskeletal framework of interlocked components and a filling in the exoskeletal framework, the improvement wherein:

• said exoskeletal framework comprises a plurality of peripheral wall forming wooden headers having a substantially rectangular cross-section and wooden stretchers the top and bottom sides substantially vertically stacked in interlocked relationship, pairs of stretcher locating notches on the top and bottom sides of and extending transversely across the entire width of said headers adjacent the ends thereof, said stretchers engaging in said notches on adjacent headers above and below each stretcher except the top and bottom stretcher in a manner to form a substantially rectangular cross-section framework;
• longitudinal grooves extend along the top and bottom sides of said headers;
• said wall structure is comprised of longitudinally connected modules comprised of said exoskeletal frameworks stepped up or down to conform to the contour of the surface on which the wall is constructed to form an interface between adjacent modules;
• said wall structure is tiered, each tier comprising a plurality of said adjacent headers and a plurality of said stretchers disposed in adjacent relationship forming side walls, so that the width of said framework descreases with each tier, the cross-section within each tier being constant throughout the height thereof;
• elongated header support blocks each having a substantially constant rectangular cross-section and top and bottom sides are interposed between at least the adjacent lower headers of the lowermost tier at a position between said stretcher locating notches and the associated stretchers to distribute the load on said lowermost headers carried by said stretchers, each header support block having ribs extending along the top and bottom sides thereof substantially conforming to and engaging in said longitudinal grooves of adjacent headers between said stretcher locating notches thereof;
• and
• said stepping up or down produces a change zone of the width at the tiering over a number of zones up the wall at each interface between adjacent modules so that stretchers that run beyond one modular length to another module do not occur at said interface between adjacent modules within said width change zone.