Work Platform for Construction of Pipelines

A work platform mounted on top of a manhole casing comprising a cylindrical casing exterior surface and a central bore having a cylindrical bore interior surface, the work platform comprising:

• a deck/frame structure;
• and
• a pair of concentric first and second cylindrical interlock lips that are secured to the deck/frame structure, the first cylindrical interlock lip comprising a cylindrical lip exterior surface and the second cylindrical interlock lip comprising a cylindrical lip interior surface;
• wherein the first cylindrical interlock lip is sized and shaped to nest into the central bore with the cylindrical lip exterior surface circumscribed by and extending closely adjacent and parallel to the cylindrical bore interior surface;
• wherein the second cylindrical interlock lip is sized and shaped to fit snugly around the manhole casing with the cylindrical lip interior surface circumscribing and extending closely adjacent and parallel to the cylindrical casing exterior surface;
• and,
• wherein when the work platform tips or slides relative to the manhole casing, the first cylindrical interlock lip engages the cylindrical bore interior surface and the second cylindrical interlock lip engages the cylindrical casing exterior surface for thereby preventing the work platform from tipping or sliding off of the manhole casing.

A work platform mounted on top of a manhole casing comprising a cylindrical casing exterior surface and a central bore having a cylindrical bore interior surface, the work platform comprising:

• a deck/frame structure;
• and
• a plurality of arc-shaped interlock lips secured to the deck/frame structure, the arc-shaped interlock lips comprising arc-shaped lip exterior surfaces and arc-shaped lip interior surfaces;
• wherein each arc-shaped interlock lip is sized and shaped to either nest into the central bore with the arc-shaped lip exterior surface there of extending parallel and closely adjacent to the cylindrical bore interior surface or to fit snugly around the manhole casing with the arc-shaped lip interior surface thereof extending parallel and closely adjacent to the cylindrical casing exterior surface;
• and,
• wherein when the work platform tips or slides relative to the manhole casing, the arc-shaped interlock lips engage either cylindrical bore interior surface or the cylindrical casing exterior surface for thereby preventing the work platform from tipping or sliding off of the manhole casing.