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 · bolt is used as an injection rod for grouting purposes. ith the future that the lost drilling bit is predesigned with holes to aid grouting. This unique fca- ture makes construction

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Page 1:  · bolt is used as an injection rod for grouting purposes. ith the future that the lost drilling bit is predesigned with holes to aid grouting. This unique fca- ture makes construction
Page 2:  · bolt is used as an injection rod for grouting purposes. ith the future that the lost drilling bit is predesigned with holes to aid grouting. This unique fca- ture makes construction
Page 3:  · bolt is used as an injection rod for grouting purposes. ith the future that the lost drilling bit is predesigned with holes to aid grouting. This unique fca- ture makes construction
Page 4:  · bolt is used as an injection rod for grouting purposes. ith the future that the lost drilling bit is predesigned with holes to aid grouting. This unique fca- ture makes construction