Construction control and documentation of facade elements using terrestrial laser scanning

Abstract

The current trend of the construction of high-rise buildings is based on construction of a reinforced concrete frame and on subsequent mounting of a light curtain wall. Parts of facades of buildings are also additional elements like balcony railings. The correct functionality, safety and also the aesthetic look of the facades depend on accurate fitting of these elements to the concrete frame. The facade elements are mounted (fixed) using anchor blocks, which are built in the concrete frame. The paper presents the procedure of as-built documentation of anchor blocks of the building complex Panorama City in Bratislava (Slovakia). The complex consists of two high-rise buildings with height of 110 m and a connecting part with height of 15 m. The as-built documentation was created for the facades of the high-rise buildings, on which more than 2500 anchor blocks are situated. Each anchor block consists of four threaded rods of type M20. The position of the anchors can be described by 4 points, defined by intersection of the rod’s main axis and a plane representing the part of the concrete frame. For determination of the position of anchor blocks, the threaded rods and the planes were modelled from TLS point clouds. The measurement procedure, data processing and results are described. Part of the paper is devoted to accuracy analysis and the analysis of limitations of TLS usage, also.