BOLT FIXING DEVICE OF JET PUMP BEAM

摘要

PROBLEM TO BE SOLVED: To provide a bolt fixing device fixing and unfixing a head bolt smoothly in a short time by eliminating the need for welding work upon the operations for attaching/detaching a jet pump inlet mixer.

SOLUTION: In the bolt fixing device of a jet pump beam, the inlet mixer is pressed and supported from above by the head bolt 30 of a jet pump beam 27. A lock cap 36 slidable and integrally rotated in the axial direction is provided at the polygonal head portion 32 of the head bolt 30. A body housing 37 accommodating the lock cap 36 is installed on the upper surface 27a of the jet pump beam 27. A plurality of tapered external teeth 44 at the outer circumferential side surface of the lock cap 36 and internal toothed grooves 45 of the body housing 37 selectively engaged with the external teeth 44 of the lock cap 36 are provided. The head bolt 30 of the jet pump beam 27 is fixed by engaging the external teeth 44 of the lock cap 36 with the internal toothed grooves 45 of the body housing 37.

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