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DESIGN AND PILOT TESTING OF A REMOTE CONTROLLED MICROTUNNEL BORING MACHINE (MTBM) FOR COMPETENT ROCK
The project , "design and pilot testing of a remote-controlled micro TBM (MTBM)
For competent rock", was initiated on 01.12.93 and completed at the end of May 1997.
The initial mix of the four partners, Geodata (Italy), VATT (Germany), Consonda (Italy)
has experienced changes of two of the four partners. VATT became Alpine Westfalia;
Consonda resigned and was replaced by EdilMac of Italy. The objective of the project was to construct and demonstrate the use of the 1.6m diameter , remote controlled MTBM whose potential applications include rapid excavation of horizontal holes for hydraulic transport, service conduits, and exploratory audits. The technical specifications for the MTBM are given in Table 1.
Table 1: MTBM Specifications
ITEM SPECIFICATIONS
Max cutter load 50kn
No. of cutters (disc type) 18
Dia of cutter 180-200mm
Cutter head thrust 950kn
Gripper thrust 2400kn
Variable frequency drive motors, total power for 2 motors 140kw
Controllable rpm 0-24
Torque 56kNm
Boring Stroke 600mm
Curve radius 150m
Total weight 25t
The Prototype MTBM was assembled in the shop of Voest Alpine, Austria, ( subcontractor Of Alpine Westfalia) and transported to the test site (Sedrina Quarry near Bergamo, Italy) in Late December 1996.
The tests for all principal functions of the prototype were performed during boring of the 40m hole in the limestone of Sedrina Quarry. The results of the tests were short of the expectations listed in Table 1 and the machine was deemed not to be marketable without major changes in the design.
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