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 bar jointly developed by ONTON and the Railway Construction Research Institute was used for rapid anchoring. The main contents are as follows:

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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