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The Underground High Speed Transit System - Fewer Auto ...

Extreme Engineering Transatlantic Tunnel. In the proposal described in an Extreme Engineering episode, trains would take 18 minutes to reach top speed, and 18 minutes at the end to come to a halt. During the deceleration phase, the resultant 0.2g acceleration would lead to an unpleasant feeling of .

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Atomic Skies: The Atomic Subterrene

Jul 14, 2012 · However, while these numbers sound impressive, it's worth pointing out that modern tunnel-boring machines can excavate tunnels as wide as 16 meters at rates of up to 4.8 meters per hour. The nuclear subterrene's performance could potentially be substantially improved with better materials and a higher-temperature reactor, but this was not to be.

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CPC Definition - United States Patent and Trademark Office

A cap is understood as the roof or top piece in a three-piece, support or beam set used for tunnel support. A piece of plank, timber, support or beam placed on top of a prop, stull, or post. The horizontal member of a set of timber, support or beam used as a roadway support:

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Tunnel Boring Machines | Mühlhäuser

The EPB (Earth Pressure Balance) is the most widely used type of tunnel boring machine (TBM) and provides the best compromise between technical specifications and cost. It is best suited for cohesive soil with clay and fines but can also tunnel in granular soil containing medium sand.

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Elon Musk's Boring Company isn't technologically ...

Aug 11, 2017 · And that's what Musk hopes to do to tunnel digging in the US. One reason tunnel digging in the US is so pricey is that labor costs there are much higher than in most other parts of the world.

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The Secret Dulce underground base and the Grey Alien ...

They have laser-drilling machines that can drill a tunnel seven miles long in one day. I was involved in building an addition to the deep underground military base at Dulce, which is probably the deepest base.

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Students develop technology for tunnel boring machines ...

Apr 01, 2014 · SEATTLE – The city's tunnel boring project inspired nearby engineering students last year to address navigation improvements. They've filed a provisional patent application and are building a prototype. Tunnel boring machines (TBMs) and specifically one of .

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A Brief History of Tunnels - Popular Mechanics

Jan 17, 2014 · Babylonians dig a 3000-foot-long tunnel under the Euphrates River. Tunnel construction booms when Swedish engineer Alfred Nobel (yes, that Nobel) patents dynamite. The Holland Tunnel uses a ventilation system to remove exhaust. On either side of the Hudson River, 84 fans in four buildings change the tunnel's air every 90 seconds. James S.

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Advanced Containment System(Patent) | DOE Patents

A trench is dug on either side of the zone of interest containing the buried waste so as to accommodate a micro tunnel boring machine. A series of small diameter tunnels are serially excavated underneath the buried waste. The tunnels are excavated by the micro tunnel boring machine at a consistent depth and are substantially parallel to each other.

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McLaughlin Group Utility Boring Vacuum Excavation

McLaughlin is a leader in trenchless technologies. From utility boring to vacuum excavation, we provide workable solutions for the underground industry.

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CN106150508A - In-karst-stratum tunnel drilling ...

The in-karst-stratum tunnel drilling construction method includes the following steps that according to design requirements, surveying and lining are carried out, and a contour line is positioned and excavated; a tunnel face (1) is subjected to an advance geology forecast, and a geological forecast is obtained; if a drilling condition is not met, the tunnel face (1) is reinforced till the drilling construction condition is .

Tunnel Boring Machine [TBM] technology in hard rock mining

Tunnel boring machines in hard rock mining. From the proceedings of the MVSSA 2013 conference: The Art of Precision. Abstract. Historically, mine planners have recognised the benefits of using Tunnel Boring Machine [TBM] technology to facilitate rapid access to ore reserves in hard rock mines.

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US 9292017 B2 - System And Method For Real-time Guidance ...

A dynamic geo-location and mapping system for a tunnel boring machine (TBM) used to determine deviation from a design centerline of a tunnel to the TBM, generate a position update for the TBM guidance system and generate a three-dimensional plan of the tunnel as built, the system comprising: a .

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How much does a tunnel boring machine cost? - Quora

May 14, 2017 · Around 10 million euro will get you a 7m diameter TBM for typical metro type projects and another 5 million for the ancillary equipment required to operate it such as separation tanks, power supply, bentonite supply, grout supply, service ve...

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What is a Tunnel Boring Machine (TBM)? - Definition from ...

A tunnel boring machine (TBM) is a piece of equipment designed to bore circular tunnels through dense, hard rock, relatively soft sand or any substrate of any hardness between the two. They come in various sizes capable of creating bores with diameters as small as 40 inches and as large as 60 feet.

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Rival Downhole Tools Secure Two US Patents for Proprietary ...

Aug 03, 2018 · The patent for invention No. 10,017,991 is for a Hammer Drill downhole drilling motor inclusive of a percussion or "hammering" anvil incorporated into Rival's mud lubricated bearing assembly. "These latest patents further advance our performance offering for our customers," said Neil Fletcher, CEO, Rival Downhole Tools.

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tunnelmachine - detailshere

This 1975 patent further specifies that the machine is intended to excavate tunnels up to 12 meters in diameter or more. This means tunnels of 40 ft. or more in diameter. The kerf is the outside boundary of the tunnel wall that a boring machine gouges out as it bores through the ground or rock.

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Drilling System-related patent applications

Oct 18, 2018 · Drilling System-related patent applications - as published by the U.S. Patent and Trademark Office (USPTO). Image View List View Download PDFs Classic Ripping and scraping cutter tool assemblies, systems, and methods for a tunnel boring machine

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Tunnel boring machine and method -

A tunnel boring machine having increased thrust capability is disclosed. The machine includes a rotatable cutter head for cutting material away from the face of the tunnel and a drive shaft and motor for rotating the cutter head in a cutting state of operation. A bearing assembly is also provided for facilitating rotation of the cutter head during the cutting state of operation.

Rock melting excavation process - Technologies Transfer Est.

Apr 28, 1992 · The invention relates to a heat drilling process for the drilling of tunnel, deep well and exploration boreholes, in which the profile of the tunnel or borehole is melted down by means of a heat source and during the drilling progress the resulting molten rock is pressed into the surrounding side rock. Such a process is known from DE-PS 25 54 101.

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