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
Electrostatic charger and image forming apparatus
Pressure-applying member, fixing device, and image forming apparatus
Washing machine
Package for a medicinal product
Seat post having a non-uniform cross-section
Method and system for cooling of integrated circuits
System for alarming upon occurrence of secession of smart key for vehicles
  Randomly Featured Patents
Image processing apparatus
Lockable drawer unit
Lithium ion battery
System and method for multiple independent computer inputs using unique device and source identification systems
Method for the preparation of crystalline and zeolitic aluminosilicates
Landscape divider
Indole derivatives as 5-HT agonists
Packing having catalytic or absorbent agents
Stowable support apparatus
System and method for securing data exchanged during a telephone call