A guidance system designed for use on straight or simple tunnel alignments that may include large radius curves. The principle of operation is based on a standard tunnelling laser mounted parallel to the designed axis, with curves negotiated by the manually inputting into the system a series of offsets in X &/or Y, pre-calculated before each shove.
This is a version available as a low cost, PC compatible design
using the same principles of operation as the Basic System but supplied with only a Combined Target Unit, cables & ZED designed, Windows compatible software, ZBasic, running on a customer supplied PC as the user interface, for setup and display.
There is ZED designed, Windows compatible software, ZBasic, running on a customer supplied PC as the user interface, for setup and display
This configuration represents the next level of complexity compared to the Minimised Basic and Basic systems for TBM guidance, with the designed tunnel axis being defined as a 3D set of coordinates, typically as Northings, Eastings & Levels. In its simplest version, the laser is mounted for the best ‘line of sight’ view of the target unit with its global position and the vertical & horizontal angles of the beam manually entered into the system.
Due to the more sophisticated mathematical approach used by the system, the entry level configuration described here can be enhanced with a much wider range of options & upgrades, tailoring the equipment to meet the demands made by more demanding project requirement.
From the original Client supplied survey data for the project, the designed tunnel alignment is defined within a global frame of reference as 3 coordinates, typically a Northing (Y), Easting (X) and Level (Z), called the DTA table or file, and is downloaded into the system.
The laser position and the angles associated with the beams direction are required for system entry, together with the distance along the tunnel drive or chainage.
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