A deepening tube with grid-like reinforcement
A staggered reinforcement structure at the corners
A re-straight fit structure of well body and deepening pipe
A concave-convex structure docking mating structure applied to a closed composite well
A mating composition of a ribbed assembly for a split well
A surface reinforced structure with multiple shape fits on the surface
A seal fitting structure at the position of well body and top cover
A reinforced structure with inner and outer diamond fit
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