Resources Contact Us Home
Method and device for controlling the trajectory of a shield-type tunnelling machine

Image Number 6 for United States Patent #4904115.

Method of controlling the trajectory of a shield-type tunnelling machine equipped with displacement control hydraulic rams (3), characterized in that, these rams being divided into at least three groups of rams (6A, 6B, 6C), the theoretical instantaneous flowrates of fluid to be applied to each of these groups are continuously determined (40) from the curvature characteristics and the overall rate of advance set point trajectory and these groups (7-26-27-28) are supplied with instantaneous flowrates, the values of which correspond to the theoretical values.

  Recently Added Patents
Image surveillance system and method of detecting whether object is left behind or taken away
Lighting elements
Vanilloid receptor ligands and use thereof for the production of pharmaceutical preparations
Packaging sleeve
Synchronization of communication equipment
Halogen-free flame retardants for epoxy resin systems
Method for forming pattern
  Randomly Featured Patents
Lens system
Filter for exhaust gas from diesel engine and equipment
Ink cartridge
Portable holder to support a recapped container of effervescent liquid in an inverted position to retain the liquid's freshness
Comparator with improved time constant
Arrangement and method for false-twist spinning
Methods and apparatus for multi dimension fluorescence spectrum measurement downhole
Method for welding at least one region of an overlay sheet to a receiving surface of a carrier layer
Multiple-input-multiple-output wireless communications cube antennas
Tumbler holder