Advanced grouting method for deep-buried tunnel earth surface directional drilling high-pressure sleeve valve pipe
The invention relates to a deep-buried tunnel earth surface directional drilling high-pressure sleeve valve pipe advance grouting method. The method comprises the steps that an orifice surface soil section is formed; opening a deflecting section; opening more than three horizontal grouting sections;...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a deep-buried tunnel earth surface directional drilling high-pressure sleeve valve pipe advance grouting method. The method comprises the steps that an orifice surface soil section is formed; opening a deflecting section; opening more than three horizontal grouting sections; a sleeve valve pipe is arranged below the horizontal grouting section; the space between the sleeve valve pipe and the hole wall of the drill hole is filled with filler; a duplex high-pressure grouting plug is arranged in the sleeve valve pipe to the bottom of the hole through a directional drilling rod, and the distance between the duplex high-pressure grouting plug and the sleeve valve pipe is 1-3 m; high-pressure grouting is conducted between the duplex grouting plugs, the grouting pressure ranges from 5 MPa to 15 MPa, grouting is conducted on the rock mass after filler is split by grout, controlled grouting is adopted, and grouting of the section is finished when the designed pressure is achieved and the injec |
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