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How is the position of the camera in the sewer line determined? The length measurement for determining the position of the camera usually works according to the following principle. The camera cable is pressed against a measuring wheel by rollers on its way through the duct or line. The rotations of the measuring wheel can be used to precisely determine both the unwound length and thus the position in the line as well as the feed speed. For this purpose, … |
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Apart from the used hardware, another essential component of TV inspection systems is their software that allows for the control of the system, data transfer, processing and storage, as well as a multitude of image representation modes that are implemented by means of its additional functions. The key task is the individual determination and documentation of all relevant sewer conditions that are captured by the camera and, if required, also by additional … |
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The software that is used for a survey of the actual sewer condition serves to capture, record, convert and file sewer inspection data. The following functions should be included:
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The documentation of a visual inspection measure should consist of the following parts:
(Image: Picto Desk Storage Schreibtisch Ablage Archiv) (Image: Picto Video Film … |
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The report on the visual interior inspection should contain a summary of the inspection project as well as individual reports on all objects of investigation (section, manhole, special structures, etc.). The individual reports should include the following information and minimum content:
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(Image: Picto Foto Images Fotoapparat) Photo documentation: if required, photos shall be presented on photo base sheets that include at least the following basic information:
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(Image: Picto Desk Storage Schreibtisch Ablage Archiv) For land drainage facilities, document additional information as appropriate, such as:
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According to EN 13508-2, the following pieces of information must also be recorded within the framework of the visual inspection from inside:
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(Image: Picto Fakten) What information should be superimposed on a video recording? The following information should be electronically superimposed on the video recording of the inspection:
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(Image: Picto Präsentation) The personnel responsible for the inspection must have sufficient specialist knowledge of the inspection of wastewater sewers and drains, both on the part of the client and on the part of the engineering firm and the inspector. This expertise must be kept up to date through
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(Image: Picto Liste) What expertise is required to carry out the inspection correctly? The expertise should include the following points:
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(Image: Picto Beratung) During preparation, monitoring and assessment, the client of an inspection measure is responsible for ensuring that all necessary preparations and coordination take place and that the inspector is provided with a proper information and data basis. [DWAM149-5:2010] When When awarding a contract, care must be taken to ensure that the quality requirements for the services to be awarded are described precisely and in detail and can … |
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(Image: Picto Test) During the execution of the inspection measure, these must be continuously and professionally monitored and accompanied from the beginning. This includes a random analysis of the entire visual and digital inspection results. Any discrepancies or defects found must be clarified and rectified immediately - and the causes eliminated. [DWAM149-5:2010] |
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Jan 26, 2023 This module provides a comprehensive overview of direct and indirect optical inspection methods like CCTV for qualitative condition assessment of pipelines and sewers as well as manholes. In terms of content, the module thus belongs to the topic block "INVESTIGATION", the first of the four basic activities within the framework of integral urban drainage management according to EN 752. The optical inspection procedures presented here provide an essential basis for assessing the performance of the drain and sewer system or for developing the rehabilitation plan. After completing this module, you will have a sound knowledge of:
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Summary: This module gives an overview of methods of inspection from the inside for quantitative condition assessment. It is to be understood as a supplement to the module "Optical inspection from the inside for qualitative condition recording" and thus belongs in terms of content to the topic block "INVESTIGATION", the first of the four basic activities within the framework of the integral urban drainage management according to EN 752. The procedures … |
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The results of the visual inspection are often not sufficient for a comprehensive description of the sewers’ condition and the derivation of satisfactory statements on the type and extent of damage, type and extent of rehabilitation measures and hydraulic performance capacity. That is why a quantitative determination of the actual condition might also be required for a technically and economically sound rehabilitation planning This relates in particular … |
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The subsequently described measurement systems and methods represent a first approach for a comprehensive recording of the actual condition of sewer systems. They allow for the recording and quantitative assessment of: (Image: Deposition in a sewer - Hard or compacted material) (Image: Displaced connection (BAJ) - Radial displacement (B)) (Image: Deformation of a plastic pipe (BAA) - Vertical (A)) (Image: Cavity formation under the maintenance of a road … |
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