ToHa Towers

The ToHa tower is a very wide and large 29-story building that extends over approximately 53,000 sq m. The structure’s complex geometric shape is the result of different floor areas; as you move up and down from the middle story, the areas of the floors gradually decrease. The designers (Yashar Architects in partnership with Ron Arad Architects, London) emphasized the receding façades using curtain walls: they “pulled” the floors slightly outward and designed curtain walls that connect the stories from floor to floor.

The curtain wall glazing is installed within designated profiles prefabricated off-site. To ensure proper fitting of the frames to the openings, and to make sure they connect to one another accurately, precise and reliable information regarding the openings was required. Since the openings on the ToHa building are especially large, measurement accuracy was especially critical and we were asked to help by mapping the structure using 3D laser scanning.

As mentioned, the circumference of the structure is especially large, so we had to erect several large scanning stations around the building, both in its close vicinity and at a distance from it so as to ensure accurate closure of the grid around the entire circumference of the building, while maintaining a very high level of accuracy.

Another challenge we faced, which we dealt with successfully, resulted from the fact that scanning was performed in two phases: from the ground floor up to the 12^th floor, and from the 12^th floor up to the roof. Working in two phases meant that the construction carried out between the first phase and the second phase created forces on the structure which changed its geometry and challenged us, as surveyors, to provide accurate data.

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