How to inspect an underground pipe
Other topics from this section:In general, the visual inspection by camera or the examination of the sewage pipes is of great importance for the leakage testing, because the first damages can be detected and it can give information about the tightness of the house connection. The same applies to the camera inspection of drain lines.
The house connection usually consists of the ground pipes and the connecting sewer, which discharges the wastewater produced in and around the house to the public sewer. Basic lines are inaccessible lines laid in the ground or in the base plate of the house, which feed the wastewater to the connecting sewer. The connection sewer is the sewer between the municipal sewer and the property line or the first cleaning opening on the property. Basic lines and connecting sewers within the private property are generally to be constructed, maintained and serviced by the property owner. The corresponding requirements can be found in the respective state water laws of the federal states.
CARRYING OUT THE CAMERA INSPECTION ON GROUND PIPES
The house connection usually consists of the ground pipes and the connecting sewer, which discharges the wastewater produced in and around the house to the public sewer. Basic lines are inaccessible lines laid in the ground or in the base plate of the house, which feed the wastewater to the connecting sewer. The connection sewer is the sewer between the municipal sewer and the property line or the first cleaning opening on the property. Basic lines and connecting sewers within the private property are generally to be constructed, maintained and serviced by the property owner. The corresponding requirements can be found in the respective state water laws of the federal states.
An inspection camera is used, for example, to enter the ground pipe via a floor drain. It is advantageous if the inspection camera used for the optical inspection of the ground pipes has a rotatable and swiveling color camera head so that the walls and outlets/branches can also be inspected. However, in order not to lose the overview during the camera inspection of an underground pipe, a position and home function is very helpful. The home function allows the camera head to be moved back to its original position at any time, and the position function helps the user to estimate the gradient of the ground pipes. All this simplifies navigation considerably.
Since in many buildings the course of the ground pipes is not known, this can be determined with a locator. A crosshair of the locator shows the position of the signal-emitting camera head. In addition, the distance to the transmitter is indicated by a tone varying in volume, so that one is guided directly to the camera head and thus to the point of damage. Precise localization and delimitation of the damage is in any case the most customer-friendly way of detecting defects so that they can be repaired with the least possible intervention in the building fabric.
For quality assurance, it is helpful to record the camera movement. The documentation of the visual inspection is not only very important for the executing company, but it is also interesting for customers to get insights into their wastewater system. For possible damage, the video recording also provides a good basis for analysis and the development of rehabilitation proposals.
