What Is Cuplock Scaffolding?

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  • Written By: E.A. Sanker
  • Edited By: E. E. Hubbard
  • Last Modified Date: 20 November 2019
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Cuplock scaffolding is a type of scaffolding characterized by a joining method that uses metal cups to lock beams together. Like other types of scaffolding, cuplock scaffolding is a temporary network of frames used to support workers during construction or renovation of a structure, such as a building, where high access points are needed. The overall stability and ease of assembly of the cuplock system makes it the preferred type for projects where a large scaffolding must be constructed quickly and must support a relatively heavy load.

Scaffolding consists of several horizontal and vertical bars, usually metal, linked together in a framework structure that may either be supported from the ground or from the building to which it is attached. This structure incorporates walkways that workers can use to access various parts of the construction area that would normally not be accessible. While several types of scaffolding exist, cuplock scaffolding is unique in that it provides a way to link four horizontal bars together at once at a central joint. This design reduces assembly time while providing a versatile and strong structure that is safe for workers.


The distinctive cuplock scaffolding joint system consists of three basic components: a top cup, a bottom cup, and ledgers. The cup components are ringlike, each with a hollow center that allows the round verticle bar to pass through it. Horizontal bars have ledgers, which are short perpendicular pieces that are welded or affixed to end of each bar, creating a T-shape at each end.

In the construction of the cuplock scaffolding, the bottom cup is welded to the vertical bar at fixed intervals, with the cuplike portion facing upwards. The ledgers of four horizontal bars are inserted down into the cup, so that they rest perpendicular to the vertical. The top cup is then dropped down over the top portion of the ledgers and tightened with a hammer, fastening the horizontals securely against the vertical.

This system, in addition to being extremely sturdy and quick-to-assemble, is also versatile. Horizontal bars may be added at any of the intervals where a bottom cup has been welded to the vertical, or omitted as necessary. Furthermore, any number of horizontal bars may be added to a cuplock joint up to the maximum of four.

Cuplock scaffolding is widely available from manufacturers in component form and can be assembled at the construction site. The bars and fixtures are usually made from galvanized metal, which has a protective coating that makes the metal weather-resistant. Its resistance to corrosion and rust make cuplock scaffolding useful for large-scale, outdoor projects.


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