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Get PriceThe invention discloses a water-rich weak surrounding rock long-and-big tunnel construction method. The method includes that a tunnel inclined shaft is arranged on one side of a main tunnel of a tunnel to be constructed, the main tunnel is divided into a tunnel entry section, a tunnel exit section and a middle connecting section connected between the tunnel entry section and the tunnel exit ...
Get Pricetunnel concrete floor floor concrete post Prior art date 2011-10-26 Application number KR1020147014029A Other languages English (en) Inventor Original Assignee 2341451 . Priority date (The priority date is an assumption and is not a legal conclusion.
Get PriceAbstract: Headed anchors are used commonly as an anchoring system to lift prefabricated concrete elements. For thin concrete elements, only headed anchors with small embedment depth can be used. For thin concrete elements, only headed anchors with small embedment depth can be used.
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Get PriceThis led to the development of a patent-pending process known as resistive unrolling, the companies report. The Mine Foam is strong enough to prevent rolls of grid material from unwinding under their own weight, yet allows them to be pulled apart in a controlled manner while keeping the remainder of
Get Pricetunnel concrete floor floor concrete post Prior art date 2011-10-26 Application number KR1020147014029A Other languages English (en) Inventor Original Assignee 2341451 . Priority date (The priority date is an assumption and is not a legal conclusion.
Get PriceThe nozzles of moist-mix shotcrete are the key parts of forming a steady jet flow field and ensuring the uniform mixing of water and other ingredients. In this paper, for optimizing the nozzle of moist-mix shotcrete, both the internal and external field of a variety of spray nozzles were simulated and analyzed by adopting orthogonal test method with Fluent simulation software combined. Then ...
Get PriceThe eects on the tunnel linings margin of safety, in a structural manner, can be dramatic if, for instance, there is next to no pressure conning the sides of the tunnel but there is a full overburden pressure acting on the tunnels crown.
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Get PriceNumerical simulation for optimizing the nozzle of moist-mix shotcrete based on orthogonal test ... levels of the same factor affected the shotcreting performance of spray nozzle, but the effect ...
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