Method and apparatus for tunnelling
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United States of America Patent
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Apr 14, 1992
Grant Date -
N/A
app pub date -
Apr 16, 1990
filing date -
Apr 28, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method for boring a tunnel consists in placing an excavation tool at a point of the extrados of the tunnel and in excavating a cavity by imparting the tool an advancement movement having divergent direction with respect to the axis of the tunnel. While the cavity is being filled with concrete, a further cavity is excavated in another point of the extrados and is then also filled with concrete. These operations are repeated until a plurality of voussoirs is obtained which are arranged adjacent to one another along the extrados and give rise to a frustum-shaped vault. The soil inside the vault is then excavated for a depth which is smaller than the axial extension of the vault itself, and a subsequent vault is formed having a narrower initial portion internal to the wider terminal portion of the previously executed vault.
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