E21D9/08 - CPC Classification Index

ClassID:

135993 ⎘

E21D9/08 - CPC Classification

Classification description:

Tunnels or galleries, with or without linings; Methods or apparatus for making thereof ; Layout of tunnels or galleries; Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield

Sub-classes:

E21D2009/088 » {for driving non-circular tunnels} 0
E21D9/081 » {with a rotary drilling head cutting simultaneously the whole front face} 6
E21D9/085 » {with a movable support arm carrying cutting tools for attacking the front face, e.g. a bucket} 1

Recent Application in this class:

20210317739

Mining machine applicable to fluidized mining of ore bodies and mining method

20180073362

Tunnel boring machine

20170122105

Cutter assembly with inline mounting

20160194957

Compound-type tunneling shield

20130045055

Method for replacing a tunnel boring machine roller cutter, handling device and roller cutter suited to such a method

20070044957

Method for underground recovery of hydrocarbons

20070039729

Method of increasing reservoir permeability

17878769

Test method based on test system for five-dimensional space effects of ground surface settlement caused by dual-mode shield construction