Underground cavity non-excavation repairing device and repairing method thereof
The invention provides an underground cavity non-excavation repairing device and a repairing method thereof.The underground cavity non-excavation repairing device comprises a bottom plate, sleeves are installed on the two sides of the top end of the bottom plate, extension rods are slidably connecte...
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Format: | Patent |
Sprache: | chi ; eng |
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