The ornamental design for a tubularbeam, as shown and described.
FIG. 1 is a top perspective view of a tubular beam incorporating my new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The broken lines shown in the drawings are for environmental purposes only and form no part of the claimed design.
The tubular beam is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.