| It is the most reasonable industrial method for the safety term of works shortening. |
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| Works shortening |
| It is possible to shorten it because onlyconstructs it temporarily at the
installation of the PC version of the stsrt only. |
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| Handiness of work |
| A symmetric material depends each other and the prop ends by one. |
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Safety
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Safety is improved because it moves with the multipoint roller in the work
stand of the arch type.
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| Quality control |
| The quality control is complete by the factory production, too. |
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| Example of Ｃonstructing Ｐroduct
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