In a recent innovation, the reinforcing action of full length grouted rock bolts has been improved by adding tension which is imposed upon the bolt during installation. To accomplish this, the grout is confined to the upper portion of the bolt by means of a sealing washer. The grout is mixe...
secured after the entire roll10is installed. Alternatively, the installer manually pulls intermediary material7out and the driver drives device11forward so that the installer has access to the next section of fence frame9. In some embodiments, the weight of roll10creates enough tension in ...