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The utility model discloses a solid tendon stop-grouting plug comprising a hard outer ring and a stop-grouting plug. The hard outer ring is made of galvanized iron material; the section of the outer… (More)
The utility model discloses a relay chamber-free jacking construction device for an ultra-long pipe roof. The relay chamber-free jacking construction device comprises a portal pressure-maintaining… (More)
The invention discloses an intermediate-jacking-station-free jacking construction device of an ultra-long pipe roof and a method thereof. The device comprises a tunnel portal pressurizing device and… (More)
The utility model discloses a blast hole sealing plug which comprises a closed cavity; the closed cavity is made of rubber and comprises an oval plug head and a horn-shaped plug tail; and the tail… (More)