Sanitary sleeves installed using BIM point layout.

Sanitary sleeves installed using BIM point layout.

To avoid the messy and time-consuming process of coring recently cured cement, mechanical contractors often layout sleeves for future plumbing before the cement is poured. This was the approach Andy J. Egan Co. took for the new construction of a 10-story hospital to avoid any construction interference with the building’s radiant heating system. Traditional layout methods are prone to human error, however, and by the company’s estimates, would have taken two weeks per floor.

Egan partnered with sister company 3D imaging Services to layout sleeve locations, using a total station that’s coordinated with the project’s BIM model. Once survey control is established, the crew is able to mark installation locations with .5 inch accuracy. Each floor required 350-400 points, which the 3DIS team completed in just two days, far less than the two weeks estimated for a manual layout.

3D point layout and progressive scanning of sanitary sleeves.

3D point layout and progressive scanning of sanitary sleeves.

In addition, the project team used progressive laser scanning to validate the location of those sleeves and hangers once they were installed. Doing so ensured that any field errors were caught early and immediately corrected, or accounted for in the plumbing fabrication being done off site. Both the site superintendent and project manager agreed that this combination of progressive scanning and fabrication saved significant time and money on this project.

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