Abstract: A utility line Y support structure having a tubular pole adapted to be erected to extend upright from the ground, a pair of Y arms extending upwardly and outwardly from the top of the pole, connector means connecting the bottom of the Y arms to the top of the pole, and a crossarm connected between the upper portions of the Y arms, the Y arms being constructed of a structural element having a generally C-shaped cross-section, and the crossarm comprising a truss with lattice work.

Abstract: A slip joint construction for a tubular pole section of a utility pole such as for electrical transmission or lighting wherein a male portion of a tapered pole section fits telescopically within a female portion of another tapered pole section. The female portion is provided with a back-up strip extending along the long seams thereof. The male portion is provided with slots which extend along the long seams thereof, each slot extending the length of the slip joint. A doubler plate is welded on the inside of the male portion to extend across and along the longitudinal extent of each slot.