초록 ▼

A new transmission line support structure including a pair of poles and a superstructure supported from below on the tops of the poles and comprising one or several crossarm units each of which includes a crossarm and may include a plurality of upwardly extending pole extensions. Each crossarm unit

A new transmission line support structure including a pair of poles and a superstructure supported from below on the tops of the poles and comprising one or several crossarm units each of which includes a crossarm and may include a plurality of upwardly extending pole extensions. Each crossarm unit is secured to the tops of a pair of poles or pole extensions by means which act in directions parallel to the axes of the poles and prevent transverse motion therebetween, and which may include elastomeric pad means.

대표청구항 ▼

A transmission line structure comprising, in combination: a plurality of poles of prestressed concrete, each having a bottom end for securement to the ground and a flat top end; a superstructure including at least one cross arm unit of prestressed concrete having a pair of spaced flat under surfaces

A transmission line structure comprising, in combination: a plurality of poles of prestressed concrete, each having a bottom end for securement to the ground and a flat top end; a superstructure including at least one cross arm unit of prestressed concrete having a pair of spaced flat under surfaces supported from below on the flat top ends of said poles, and comprising a cross arm and at least one conductor-supporting pole extension unitary therewith and projecting upwardly therefrom; and axially extending means rigidly securing said superstructure to the tops of said poles, including studs embedded in and extending axially from said poles, apertures in said superstructure, at the locations of said flat under surfaces, spaced for traversal by said studs, and nuts mating with the portions of said studs which extend upward through said superstructure, and engaging said superstructure.