PIPE TYPE LOCK BOLT

PIPE TYPE LOCK BOLT

PROBLEM TO BE SOLVED: To improve pull-out resistance of a pipe type lock bolt. SOLUTION: In a pipe type lock bolt 1 having an expansive diameter- enlargeable double pipe 2 expanded being filled with pressure liquid and provided with reinforcing sleeves 3, 5 at both ends, restraining pipes 7 are arra...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: IMOTO ATSUSHI
Format: Patent
Sprache:eng
Schlagworte:
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To improve pull-out resistance of a pipe type lock bolt. SOLUTION: In a pipe type lock bolt 1 having an expansive diameter- enlargeable double pipe 2 expanded being filled with pressure liquid and provided with reinforcing sleeves 3, 5 at both ends, restraining pipes 7 are arranged between the reinforcing sleeves 3, 5 and insert-fitted to the outer periphery of the double pipe 2. The parts other than the restraining pipes 7 are expanded by filling the pressure liquid, but the parts of the restraining pipes 7 are not expanded. The pipe type lock bolt 1 is therefore formed in uneven shape to improve pull-out resistance.