Underwater dry cabin wellhead pipeline cabin-penetrating sealing structure
Caliper type rapid anchor disassembling jack and application method thereof
Water-pump-free sand-water stirring system and engineering ship
Gob-side entry retaining unit support and pier column combined simulation device and test method
Parallel gantry rolling walking temporary supporting robot
Subway station platform-platform transfer system with separated left and right lines
Installation method of rail type transportation lifting device in tunnel
Horizontally movable vertical shaft rope guide and regulating method thereof
Method for replacing filling pipe in vertical steel sleeve
Environment-friendly seabed mineral resource development device and development method