Tonon USA uses digital photogrammetry to create three-dimensional models of the exposed ground, of the shotcrete surface, and of the final lining surface. To illustrate, the figures below show a 3-D model of an entire tunnel round: face, walls, and crown back 9 m, 30 ft from the face.
This is a series of detailed pictures of the model of the left wall.
Tonon USA synchronizes with the contractor, and data acquisition never affects the construction schedule. The data acquisition at the tunnel heading takes about 15 minutes (if a 3-D model of the entire round must be made: face, walls, and crown back 9 m, 30 ft from the face), or 2 minutes (if a 3-D model only of the face must be made). These three-dimensional models textured with high resolution pictures may be used to (click on each item for details):
2028 E Ben White BLVD #240-2660 - Austin, TX 78741