Abstract: A supporting structure for an elongated tray, such as a trough or rack, which is used to contain and support a multiplicity of cables running through a building, includes an elongated arm member which extends transversely beneath the tray, one end of the elongated arm member being connectable to a building wall or to a ceiling-strut suspended from a ceiling, and an elongated axial power strut which has one end connected to the elongated arm member near the end connectable to a building wall or ceiling-strut and the other end connected to the floor of the tray, the strut extending so as to enclose an angle of preferably 45.degree. with the elongated arm member.

Abstract: A spigot and socket connection of the type which comprises a pipe end held within a socket by means of a retaining ring includes a device for securing the connection against sliding of the components. This device comprises a sleeve-like securing element lying between the pipe end and the retaining ring. The securing element carries an abutment which is engaged by the retaining ring, and the element is securely clamped to the external surface of the pipe end.

Abstract: A carrying structure for supporting, for example, cable ducts, comprises vertical bearers from which project disengagable, horizontal bearer arms. Each bearer arm has at least two hooks adjacent one end thereof, which hooks, when inserted into corresponding holes of a vertical row of holes formed in a vertical bearer, engage the bearer arm with the vertical bearer. The hooks of an arm are integral therewith and project laterally of the arm surface which is in face to face relation with the hole-defining surface of the vertical bearer when the arm is engaged with the bearer. Each hook has on one of its side edges a lateral support surface above the vertical portion of the hook which engages the vertical bearer on its side opposite to the main body of the bearer arm. This support surface engages a vertical side of the hole in which the hook is inserted enabling the transmission between the bearer arm and vertical bearer of horizontal moments.