| 摘要 |
PURPOSE: A hollow double pipe type solidifier injection bolt is provided to prevent the breaking of a tunnel face, to economize in material costs by reducing the usage of a solidifier and to function as a beam element on construction by increasing the stiffness of an injection bolt. CONSTITUTION: The hollow double pipe type solidifier injection bolt comprises: an outer injection pipe(10) whose one end is sealed up and the other end is tapered, wherein the tapered end(11) has a solidifier inlet(13) and many outlets(14); and an inner injection pipe, whose both ends are sealed up conically, interposed to the outer injection pipe(10); many inner spacers fixed at regular intervals between the inner sidewall of the outer injection pipe(10) and the outer circumference of the inner injection pipe; and many outer spacers(40) fixed along the outer injection pipe(10) at regular intervals and transformed elastically.
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