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Rehabilitation main sewer In the run-up to the project, the main sewer was rehabilitated by the CIPP (cured-in-place pipe) method and the lateral connections were milled open by a sewer robot. Inspection and documentation Before recovering the lateral connections, the sewer is once again inspected and the connections are examined. (Image: View inside a defective connection) Preparation of the manhole Due to the low positional depth of the sewer, it was … |
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At the end the lateral connection is inspected optically by using a push rod camera.
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Drains and sewers [EN13508-2:2011]
Manholes and inspection chambers [EN13508-2:2011]
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Each observation shall be recorded using a main code or combination of main codes broadly describing the condition characteristic and, where necessary, the following supplementary information:
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The location of each observation shall be specified by stating the distance in metres from the reference point. Options for setting the reference point are:
The measurement unit is metres … |
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(Image: Determination of the reference point) This regulation also applies to pipe sections projecting into manholes (projecting connection). In this case, the length of the projecting pipe section must be measured in order to determine the position of the inspection start (reference point) (see … |
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Where observations continue over a length of > 1 m ► "continuous observation" required using:
The start and end points of different continuous observations require supplementary numerical labels (A1...An - B1...Bn). When a continuous observation changes in quantification and/or circumferential location, this shall be recorded by repeating the continuous observation … |
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Each observation must be described by a main code comprising three letters and additional information.
No observation may be recorded without using one of these codes! (Image: Structural sections) B (Image: Manhole DN500) D |
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The 2nd letter indicates the group assignment. There is a distinction between four groups:
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The 3rd letter indicates details of codes relating to the fabric of the pipeline, to the operation of the pipeline as well as details of inventory codes and details of other codes.
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(Image: Longitudinal cracks )
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The coding system according to [EN13508-2:2011]describes tightness specifications as independent main codes. The following features must therefore always be recorded additionally with the corresponding main code:
These codes only need to be recorded additionally if they are also "visible". (Image: Infiltration … |
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The required characterisations (Char. 1 and Char. 2) serve to describe the observation in more detail. The first usually specifies the type of observation and the second specifies the first. Characterisations are therefore to be used in the order given. Code (Y) must be entered for each characterisation that is required but not identified. The use of code (Y) is restricted to justified exceptional cases only. The reason for the use of (Y) shall be stated … |
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(Image: Quantification of circumferential crack) |
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If increased accuracy is required, the use of measurement methods is recommended. This is determined by the client. The accuracy must be selected taking into account the performance of the measurement method so that a subsequent evaluation and intended use of the coded information is possible. For direct optical inspection, the quantifications must always be determined by measuring methods. As a rule, the application of a scale with mm graduation or … |
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The position of the observation on the circumference must always be recorded ► for this purpose a clock face reference is used. (Image: Observing defects using the clock face reference) (Table: Clockface reference records) |
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(Image: Examples … |
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The reference to a pipe joint or a manhole connection must always be documented with (A). In the picture, the reference between root ingrowth and pipe joint is marked by (A) in the column "joint". (Image: Root ingrowth in a pipe joint ) |
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Photo Reference
Video Reference
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If an observation cannot be fully described with codes ► add further information as remarks. They should be short and concise. ATTENTION: Remarks are not machine-readable, as evaluation algorithms cannot process them - the information gets lost during the process. Important: The description of an observation with (possibly several) codes is always favourable. |
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