Tunnel boring machine - Wikipedia
A machine for making tunnels through rock by slitting the tunnel front wall by means of high speed liquid jets which machine comprises a main frame, a carrier movably mounted thereupon, a cutter unit movably mounted on the carrier, whereby the cutter unit is able to cover the tunnel front wall with slots. The cutter unit consists of high speed jet generators which are powered by a non-movable ...
US3799615A - Tunneling machine having generator means for ...
A shield tunneling machine having incorporated therein an earth removing apparatus which comprises a tubular casing having an earth inlet at one end and a closable earth outlet at the other end, and an earth transport conveyor rotatably provided within the casing and comprising a helically twisted strip.
US4456305A - Shield tunneling machine - Google Patents
AM-50z-w roadheader is a machine designed to excavate galleries in section up to 16.4 m2 (low version) and up to 22 m2 (high version), in rocks having a compressive strength up to 60 MPa. The machine can operate in underground excavations ...
Tunnel boring machines and equipment - DirectIndustry
Proctor Tunneling Machine. This machine is the joint production of O. S. Proctor, of Denver, and E. F. Terry, of Terry & Tench Co., contractors, New York. This is to cut a tunnel or heading 8 ft. in diameter, converting all the material into dust or chips.
Tunneling Machines - Metallurgist & Mineral Processing ...
Ultimately every contractor wants the best machine possible to complete the project on time and on budget. If you read closely through the following pages, you will begin to understand why Robbins TBMs are the best investment for your tunneling project.
Tunnel Boring Machines | The Robbins Company
The World's Largest Tunnel-Boring Machine Must Be Saved. Bertha has stalled deep beneath Seattle, leaving the city's planned waterfront renaissance hanging in the balance.
The World's Largest Tunnel-Boring Machine Must Be Saved
On Saturday,the world's largest tunnel boring machine was dedicated in the city of Seattle. ... Having two erector arms is unusual for a tunneling machine and allows it to operate at twice the ...
Gizmag goes inside the world's largest tunnel boring machine
Sep 23, 1975 · Tunneling machine having a pair of scraper assemblies independently controllable by two operators in side-by-side relation in an operator's cab overlying the forward lower receiving end of an inclined conveyor, the scraper assemblies including scrapers arranged to dig into material forwardly from the machine and to move the material rearwardly into the receiving end of the conveyor.
Tunneling machine - Northwest Engineering Company
Oct 03, 1972 · A tunneling machine having a front portion on which two swinging frames with rotating cutter heads are mounted. Four parallelly arranged double-acting hydraulic advance jacks interconnect pivotably the front portion and a rear portion.