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Covering works construction method null of the shield tunnel the internal pressure operation
Covering works construction method null of the shield tunnel the internal pressure operation
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机译：盾构隧道盖工程施工方法无内压作业
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摘要
PURPOSE:To reduce the construction period and cost in a lining method of shielded tunnel receiving an inner pressure. CONSTITUTION:A plurality of arc steel plates are appropriately welded at the tail of shield body 1 while excavating the ground by a shielding machine to form a steel pipe body 2 correspond to the outer diameter of shielded tunnel to be constructed. A plurality of large and small concrete arc-shaped main segments 3 and key segments 4 are assembled in the steel pipe body. The key segments 4 are appropriately pushed in toward the front having a sharp end and thereby the whole segments 5 are widened to press the steel pipe body 2 from the inside face. While conducting prestress in the steel pipe, segment rings 5 are pressed to contact therewith to unify them as a unit.
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