In the release bolt, the release bolt screw installed on both ends of the body and the body a load and, also, the cross section of the main body adjacent to both ends of the screw rod is non-circular, projecting axially intermediate portion of the body cross section is located in a non-circular axial projection of the ends of the body. Compared to the prior art, by simply releasing bolts of the present invention, the structure is easily mounted, it is possible to improve the strength ( ) and stiffness ( ) of the nesting type connection member after the composite shapes. With the tightening device of the release bolt as well as to a support action, the effect of reinforcement can be also, the variation of the expression complex shapes nesting member can be effectively prevented. In addition, according to the height direction of tonghol to mount the fastening device is nesting expression complex shapes member can be opened to any position by simply rotating shifting the release bolt through the tonghol can achieve a fixed object, Operation is simple, fast and, because the separation is simple, the mounting of the fastening device is not restricted in the size of the composite structure element shapes.
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