Resources Contact Us Home
Apparatus for and a method of tunnelling

Image Number 3 for United States Patent #4084386.

A drive shield of a tunnelling apparatus has elongate drive members supported and guided for longitudinal movement in a manner known per se. The drive members are connected to rear members or tails forming a rear shield and fluid concrete is introduced into a reception space within the rear shield to create a permanent lining for the tunnel. The rear members are shaped or profiled to provide recesses which are closed-off over a certain zone with the aid of covers. Reinforcing bars or the like can be inserted into the recesses to become cast into the concrete lining and means for delimiting the front end of the concrete reception space, such as a ring component, engages on the covers which form a smooth continuous bearing surface therefor.

  Recently Added Patents
Voltage regulators with improved wake-up response
Digital photographing apparatus
Method for automatically estimating inertia in a mechanical system
Systems, methods, and apparatus to prepare a mobile device for provisioning
Systems and methods for mitigating spectral regrowth from non-linear systems
Method and apparatus for band switching in wireless local access network
Method and system for implementing power detection
  Randomly Featured Patents
Higher order diffraction in holography
Variable-ballast chumming lure
Fire grate, in particular for waste incinerators
Detachable hinge, particularly for articulating a lid on a box body
Power supply frequency regulating device for vibration wave driven motor
Carnation plant named `CFPC Desire`
Pet crate
Semiconductor memory device and write method of the same
Handgrip for a skiing, walking or skating pole and handstrap fastened to the same
Shadow removal in an image captured by a vehicle based camera using a non-linear illumination-invariant kernel