Every year in December, the historical romantic Advent market is held at the fortress. It is considered one of the most beautiful Christmas markets in Germany. The spectacular location and the lovingly staged hustle and bustle attract several tens of thousands of visitors. For this purpose, 500 Christmas trees are set up, kilometre-long strings of lights are hung up and numerous market stalls are carpentered on site. In addition to these preparations, which are visible above ground, the precautionary cleaning of the sewage pipes is one of the essential measures for the expected stampede of visitors. "To avoid any unwanted surprises in the toilets under increased use, with the cleaning, we ensure trouble-free disposal of sewage through the sewers. Afterwards, the pipes are inspected with the MiniLite and the ORION," says Glöckler.

The sewer network of Hirschstein Castle is to be captured and inspected. For a holistic rehabilitation concept, not only the cause of the enormous moisture in the castle was to be found, but also the run of the pipes was to be measured with width, length and height data (xyz coordinates). For this purpose, the company also used the MiniLite, with which 3D pipe run measurement can be carried out in conjunction with the 3D GeoSense software module and the ORION 2.8 L pan and rotate camera which is equipped with a 3D sensor. In addition, a transportable compact system is required for the job, as the paved inner courtyard is only accessible via the doors of surrounding premises.

During the ongoing inspection and automatic measurement, the camera position of the ORION 2.8 L can be seen at any time from the network graphic that builds up on the display of the MiniLite. 3D GeoSense pipe run measurement captures the x,y,z coordinates of the pipes so that structural specifications such as pulled joints or bent pipes are registered realistically. During the inspection, Glöckler and Briese document a large number of displaced pipe joints and leaks in the pipe run. In the forecourt on the right in front of the castle, the experienced inspectors detect root ingrowths at the pipe connections of the vitrified clay pipes and a pipe collapse, which can lead to undermining and thus to subsidence of the soil. Beyond the subsurface causes of moisture in the foundation, the circumspect employees of Komplex Umweltservice GmbH draw attention to the leaking gutters. They hand over the comprehensive data from the geodetically accurate site survey of the wastewater facilities to the engineering firm commissioned by the municipality. They serve as a basis for the calculation of necessary investments and the planning of the structural implementation with the optimal use of resources.