Surveyor

Key Responsibilities:

The underground surveyor is accountable for the accuracy, completeness and timeliness of all geodetic data feeding the works. Duties include in particular:

Control network and orientation transfer

• Establishing, measuring and adjusting the surface control network and tying it to the national reference system; check measurements and accuracy assessment.
• Transferring coordinates and orientation from surface into the shaft (mechanical/optical plumbing, Weisbach triangle), with independent verification and error assessment.
• Developing the underground traverse behind the TBM, with gyroscopic azimuth measurements and periodic adjustment, to prevent accumulation of lateral error along the drive.
• Stabilising and periodically checking points in the tunnel, allowing for the effects of refraction, temperature and vibration on measurements in the underground environment.
• Planning accuracy against the required breakthrough tolerances and maintaining an accuracy reserve before entering critical sections.
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TBM guidance

• Entering and verifying the design tunnel axis (DTA) in the TBM guidance system and monitoring the system’s performance during the shift.
• Setting and surveying reference points and the guidance-system total station, with regular independent check surveys of shield position.
• Tracking shield deviation from the design axis (horizontal, vertical, roll, pitch) and reporting trends to shift management in good time.
• Supporting the selection of tapered rings and build planning on curves, so the machine is kept within design tolerances.
• Independently checking calibration of the guidance system after every relocation of the total station and before the machine enters curves, passes beneath sensitive structures, or reaches the reception zone.
• Providing geodetic support for launching the TBM from the shaft (position of the cradle, reaction frame and machine axis) and for reception at the end of the drive.

Setting out and as-built survey

• Surveying the position of erected segmental lining rings (as-built, ovality, stepping/lipping) and comparing against the design.
• Setting out and checking ancillary structures and equipment (shaft, portal area, cross-passages, drainage, erection rails), and measurement for quantity assessment.
• Producing as-built geodetic documentation in accordance with the regulations on state survey and cadastre, including preparation of the geodetic works report (elaborat).
• Setting out the alignment and levels for subsequent stages (track, platforms, services) and checking clearance against the design gauge.

Deformation monitoring

• Establishing baseline readings and measuring surface and adjacent-structure settlement by precise levelling and prism points, in accordance with the monitoring design.
• Monitoring deformation of the diaphragm wall and shaft structure during excavation, observing trigger and alarm values and reporting exceedances immediately.
• Measuring settlement above the alignment during TBM passage, at increased frequency in the zone of sensitive structures and utilities, and comparing against predicted settlement.
• Working with automated total stations and prism networks where continuous monitoring is specified.
• Participating in the geodetic monitoring of ground and structure required of the contractor under the Law on Planning and Construction.

Data processing and reporting

• Processing measurements and producing drawings and reports (AutoCAD Civil 3D, Amberg Tunnel or equivalent), with orderly archiving of raw data.
• Reporting regularly to the supervising body and the Engineer (FIDIC), contributing to construction-diary entries and answering RFIs.
• Preparing daily and weekly summaries of machine position and monitoring results, in a form suitable for project management decisions.
• Processing laser-scanning data where specified (profile survey, clearance checks and as-built modelling). 4.6 Instruments and safety
• Operating, safekeeping and regularly checking/calibrating instruments (total stations, levels, laser scanner) and maintaining calibration records.
• Working in accordance with occupational health and safety measures for shaft and tunnel work and coordinating with the TBM crew and other contractors.
• Training and professionally supporting junior members of the survey team and providing technical assistance to field crews.

Work organisation

• Planning survey work around the excavation and ring-build cycle, ensuring uninterrupted support to the shift.

Reporting promptly any deviation, doubt as to data accuracy or instrument fault, and stopping work where accuracy cannot be assured.

Mandatory Requirements:

Because geodetic data directly govern the position of the completed tunnel, the following are mandatory:

• Education: completed studies in geodesy to the level required for Licence No. 471 (at least 300 ECTS, or 180 ECTS with the longer experience prescribed).
• A passed professional examination in the relevant sub-field (geodetic engineering).
• At least 3 years of practical experience in geodetic works on construction sites, gained on the execution of structures.
• Independence in operating a total station and level, and in measurement, computation and accuracy control. 
• Instruments: total stations (e.g. Leica TS06/TS09/TS13/TS15/TS16, TCR1201+), precise levels (e.g. Leica LS15, Sprinter 250M), laser scanner (e.g. Leica PS40).
• Software: AutoCAD Civil 3D, Amberg Tunnel (or Tunnel Chek), Cyclone / Cyclone 3DR, MS Office.
• The ability to process data and produce as-built drawings in a CAD environment without relying on subsequent checking.
• Clean standing before the Chamber (no disqualifying Court of Honour measure).
• Readiness for shift work and for working underground, with medical fitness and valid occupational health and safety training.
• The right to work in the Republic of Serbia and command of Serbian sufficient to keep the site documentation.
• Category B driving licence.

Qualifications and Experience:

The following experience and knowledge are regarded as an advantage:

• Licence No. 471.
• Tunnelling works — work on tunnel construction (metro, railway or road), and in particular on mechanised excavation by tunnel boring machine (TBM) and on segmental lining.
• Orientation transfer into a shaft, underground traversing and gyroscopic azimuth measurement; familiarity with TBM guidance systems.
• Monitoring of convergence, settlement and deformation, including preparing and interpreting monitoring reports.
• As-built survey of primary and secondary lining and computation of excavation and concrete quantities.
• Experience on deep excavations, diaphragm walls and shafts in urban settings, including monitoring of adjacent structures.
• Experience in preparing and running a geodetic monitoring scheme and in acting on trigger and alarm values.
• Knowledge of the regulations on state survey and cadastre and of the technical standards (SRPS/EN) applicable to geodetic works.
• Command of English (level B2 desirable) for work in a multinational team and communication with the Engineer; familiarity with FIDIC practice is a further advantage.
• References are preferably supported by employer or supervision certificates stating the role, type of structure and period of engagement.
• Experience in training junior surveyors and leading a small field crew.

Candidates are expected to show marked precision and accountability, systematic data management, the ability to work independently in the field and to cooperate within a team, and readiness to take responsibility for check measurements at critical stages of execution.