| 摘要 |
The beams, used for preventing the subsidence of the tunnel support, can be simply connected in a line just by bolts. The beam comprises frames (1), more than 4 in number, forming a cube with an inner space; a connection plate (3) welded on both ends of the frames; bent frames (2) contacting at more than 2 points of upper/lower frames among the frames (1); timbering support frames (8,9) welded on the frames (1) in parallel with the upper/lower frames; a vertical support plate (5) welded between the timbering support frames.
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