According to the current state of the art, main collectors and their special structures are usually monitored using camera tractors

inspected. However, if the conditions of use deviate from the standard profile or if cross-sections are larger than DN 1600, these conventional technologies quickly reach their limits. This is where the sewer drone comes into play.

What must be considered when inspecting sewers with drones?

In the run-up to each sewer inspection using a drone, the project engineer must define a flight and deployment plan that takes into account the deployment factors of the drone technology, accessibility to the inspection area, the inspection routes, occupational safety requirements and other characteristics of the inspection area. Conscientious flight planning, including an emergency and exit strategy, is tailored to the sewer drone used in connection with the prevailing boundary conditions of the sewage system to be inspected, but is essential for a successful, economical and safe implementation of the sewer inspection using drones.

What are the advantages of sewer drone?

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The sewer drone enables surveys even in hard-to-reach areas, fits through a standard manhole manhole, and at the same time is collision-resistant. The canal drone can be controlled from the ground surface, after the above-ground start, the drone descends through the shaft entrance into the canal and the drone flight at the same time

Filming of the investigation area begins. The accompanying engineer follows the entire drone flight via a control monitor on the ground and instructs the drone pilot in real time. The stability sensors and the distance assistant of the canal drone enable stable, smooth video quality. In flight and hover mode can

smooth linear structures such as B. sleeves or local damage in the sewer can be detected. A classic entry into the respective canal maintenance is not necessary. This corresponds more closely to the basic safety concept that many cities and municipalities are striving for, to prevent personnel from entering closed rooms with an increased risk potential.

Sewer inspection during operation

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The canal can be recorded while maintaining the outfall – i.e. the operating condition – unless a clear view of the bottom of the canal is required. The costly and labour-intensive measures for waste water transfer can be avoided. A clearance measurement of the investigation area in the sewer must be carried out in advance and is required as with any use of equipment in sewers.

ISAS GmbH Engineers for the rehabilitation of sewage systems

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With the partner ISAS GmbH , additional engineering services related to sewer rehabilitation and inspection are offered.

ISAS works exclusively in the segment of engineering consulting for the rehabilitation, maintenance and optimization of existing pipeline networks and waste water systems.

ISAS is familiar with all modern recording and sanitation techniques and can therefore provide comprehensive and system-neutral advice.

The techniques used in the field of sewer rehabilitation are developing rapidly. Therefore, a specialized, experienced professional planner is essential to present the optimal solution with the appropriate partners. ISAS is characterized by 30 years of experience from over 3000 successfully completed projects in the field of rehabilitation, maintenance and optimization of existing pipeline networks and waste water systems. As a special engineering office, ISAS can offer its clients a wide range of services, from consulting to planning to general contractors.

The divisions of the company ISAS are:

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documentation

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• stocktaking

• Status recording and assessment

• Geographic information system (GIS)/ sewer cadastre

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planning

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• Complete renovation of standard profiles

• Large profiles and special structures

• Redevelopment through renewal

• properties

• Connecting line and property drainage systems (GEA)

• special projects

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Large profiles and their special structures form the arteries of urban drainage. Their constant operation alone places special demands on the recording and evaluation, which means that the canals and structures are usually not sufficiently taken into account within the framework of self-monitoring measures. The complete and reliable recording and documentation of the current condition and inventory of the sewer provides an optimal data basis for the subsequent rehabilitation planning.

The high degree of individuality of these sewers and structures makes it necessary to consider a large number of relevant specialist planning areas, such as hydraulics, structural and traffic planning, measures to maintain the drainage ditch and emergency and rescue concepts, as part of the rehabilitation planning.

The service systems on industrial and public properties are often very old, have been expanded or changed several times and range from small to large profiles. In addition, special waste water such as light liquids, fats or other contamination with corresponding public law requirements for waste water treatment often occurs here. A lack of knowledge about the actual sewer inventory and condition in connection with the primary goal of maintaining operations with the least possible disruption from maintenance or renovation measures poses a particular challenge for planning. Ability to communicate and cross-departmental knowledge of operational processes as well as a wealth of experience from many successfully completed projects make theISAS GmbH as a partner in this area.