Piston-type shield and pipeline construction method thereof
A piston-type shield for excavation of underground pipeline or tunnel has a supporting casing with several upper and lower rectangular cross-sections. Each rectangular cross section has left and right inclined pistons and a central big piston, which can move on fixed pile by movable plates. When the...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A piston-type shield for excavation of underground pipeline or tunnel has a supporting casing with several upper and lower rectangular cross-sections. Each rectangular cross section has left and right inclined pistons and a central big piston, which can move on fixed pile by movable plates. When the back cover plate of piston is opened, the piston can advance forward. When it is closed, the earthis excavated and its external casing is pushed forward. It is suitable in the limited working surface, running sand stratum, or sludge stratum. |
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