| 摘要 |
PROBLEM TO BE SOLVED: To enhance durability of a strut and to easily install/dismantle the strut by injecting non-compressive liquid such as water into a cylindrical sealed hollow member. SOLUTION: In a hollow member strut 1, a pressure stop valve 4 for injecting liquid and a cut-off valve 5 for letting air out are mounted on a sealed cylindrical hollow member 2 formed by making a core material 3 by a carbon fiber sheet and a glass fiber sheet exist at the inside and performing synthetic resin molding. If the cut-off valve 5 is used as the pressure stop valve 4, both of the valves can be combined according to an injecting method. In a force transmission mechanism in this hollow member shore strut 1, resistible shore strut axial force F in this case becomes F=wπr2 when pressure applied to the sealed hollow member 2 is determined for (w) because the axial force F is loaded by areaπr2 in contact with a wale. If the hollow member 2 is not pulled and destroyed, shore strut axial force F is proportional to pressure of liquid and becomes larger in proportion to square of a radius.
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