| 摘要 |
A temporary steel invert for tunnel is provided to regulate the extended length since the height adjustable means are included in the middle of steel temporary invert. A temporary steel invert for tunnel comprises a steel girder(160) which is located in the fixed interval according to the longitudinal direction of the excavation tunnel side and is installed, a temporary invert(170) connected from the steel rib both end point in the predetermined height to the horizontal direction, an extension controlling means which is equipped between the temporary invert and controls the pre-stress through the length adjustment.
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