| 摘要 |
A laser beam projector is used to set a series of pipe sections in place along a predetermined line and grade by mounting the projector inside of a first pipe section preset on the desired line and grade by conventional surveying techniques, and then utilizing adjusting screws on the mounting housing supporting the laser projector in the first pipe section to precisely center the laser beam on a remote target positioned on the proper line and grade. With the laser beam thus projecting down the desired pipeline at the proper grade angle, successive pipe sections are set in place by placing the target within each successive pipe section and moving each pipe section laterally or vertically as required to center the target on the laser beam.
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