| 摘要 |
A tunnel formwork of the type comprising a horizontal formwork portion and two vertical formwork portions both of which are resistant to bending. The vertical formwork portions are movable relative to the horizontal formwork portion. Each vertical formwork portion is connected to the horizontal portion by guides. At least two guides are arranged in the area of the junction points between adjacent formwork portions, and at least two guides connect the lower region of the vertical formwork portions with the central area of the horizontal portion. The formwork portions are so designed as to be secured in at least one position.
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