Long-Term Use of Automated Total Station to Monitor Movement of High-RiseBuildings in New York City

摘要

Described in this paper is the use of an Automated Motorized TotalrnStation (AMTS) for 18 months to monitor potential movement of buildings around arndeep excavation in rock. The approximately 24.4-meter deep excavation is for a newrnhigh-rise building located in Manhattan. The AMTS was installed on top of anrnadjacent building in the vicinity of the excavation, with four mini-prisms acting asrnbacksights. More than 30 mini-prisms (targets) were installed, in a few rows, onrnthree buildings abutting the excavation. The AMTS was set up to read distance,rnazimuth (bearing of line-of-sight), and angle from the horizontal (of the line-of-sight),rneach hour for the duration (18 months) of the excavation and building construction tornstreet level.rnThe data that we have collected include: target coordinates - calculated by arnproprietary software – based on measurements of the AMTS, temperature at AMTSrnlocation for a few weeks, distance from AMTS to the targets, our estimate of potentialrnmovement of the buildings involved due to periodic change in temperature, andrnaccuracy of AMTS in distance and angle measurements as reported by thernmanufacturer.rnA summary of the most likely magnitude of errors, which contribute to therncalculated coordinates of survey targets, and partial details of the closed-formrnsolution, will be presented. Recommendations for future research are also provided.