Built-in-Resin Prestressed Hollow Bolt Consctruction
YouTube video: https://youtu.be/kzeRktj0NE4 On April 15th, 2024, leaders of the National Railway Group went to the exit of Gayi Tunnel to observe the construction of the anchoring and injection machine. The R25 built-in resin prestressed self drilling hollow bolt jointly developed by ONTON and the Railway Construction Research Institute was used for rapid …
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