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What are skewed cross-sections?
Skewed cross-sections are cross sections that are not orthogonal to the alignment axis. This tool is very useful when it is necessary to obtain cuts with a specific inclination due to project requirements.
Below are their main characteristics as detailed in the TcpMDT manuals:
The Concept of Skew
Definition: The skew is the angle of inclination of the cross section with respect to the normal of the axis.
Units and Ranges: It is specified in grads (centesimal degrees) within a range of +/- 100 grads.
Direction of Rotation: A value of 0 is considered normal (orthogonal) to the axis. Negative values imply a rotation to the left, while positive values indicate a rotation to the right.
Generation and Storage
.TRE Files: Unlike normal cross-sections (.TRA), skewed cross-sections are stored in independent files with the extension .TRE.
Generation Methods:
Groups of cuts can be defined with a constant interval and skew angle.
Individual cuts can be defined, each with its own angle.
They can be selected graphically on the drawing from manual traces; the program will automatically calculate the station (PK) and the skew angle of each trace that intersects the axis.
Conversion from Plan View: Lines or polylines drawn in the mapping can be converted into skewed cross-sections. The program will identify them as such when the angular difference with respect to the normal is greater than one degree.
Graphical Representation
When drawing these cross-sections, the software takes the inclination into account so that the dimension of the associated section is variable depending on the skew of each cut, adjusting correctly to the real geometry of the design at that position