Large-section tunnel circular blasting and tunnelling method
The invention discloses a large-section tunnel circular blasting and tunnelling method. The large-section tunnel circular blasting and tunnelling method comprises the following steps that a segment of guiding tunnel is tunnelled in the middle of the bottom end of the tunnel face of a large-section t...
Gespeichert in:
| Hauptverfasser: | , , , , , , , , |
|---|---|
| Format: | Patent |
| Sprache: | chi ; eng |
| Schlagworte: | |
| Online-Zugang: | Volltext bestellen |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Zusammenfassung: | The invention discloses a large-section tunnel circular blasting and tunnelling method. The large-section tunnel circular blasting and tunnelling method comprises the following steps that a segment of guiding tunnel is tunnelled in the middle of the bottom end of the tunnel face of a large-section tunnel in the extension direction of the large-section tunnel; guiding holes are punched in a plurality of cross sections of the guiding tunnel according to a certain depth in the radial direction, and the guiding holes are distributed in a fan shape along the guiding tunnel; a plurality of large-section perimeter holes are punched in edges of fan-shaped outlines formed by the distribution of the multiple guiding holes in the axial direction of the guiding tunnel; after the guiding holes and the large-section perimeter holes are detonated, a segment of the large-section tunnel is formed, a passage is shovelled out in the middle of the large-section tunnel, and the waste stones detonated and caved are shovelled to th |
|---|