Fixture method for preventing bolt or nut from falling off

The invention relates to a fixture method for preventing bolts or nuts from falling off, which is characterized in that at least two bolts (3) are fixed on a turnout, hexagonal heads of the two bolts (3) are arranged on opposite sides, and the hexagonal opposite sides of the bolt heads or the nuts are limited through a rail part slotting part (5) when a rail part is slotted; under the condition that the rail piece is not provided with a groove, the hexagonal heads arranged on the opposite sides are provided with U-shaped anti-disengaging clamping grooves (4), the bolt head or nut hexagonal opposite sides are limited through the U-shaped anti-disengaging clamping grooves (4) in the installation base plate (1). The clamp for preventing the bolt or the nut from falling off can adapt to railway turnouts, does not affect normal switching of the turnouts, and is simple in structure, convenient to install, safe and reliable. 本发明涉及一种防止螺栓或螺母脱落的卡具方法，其特征是：至少有两根螺栓（3）固定在道岔上，两根螺栓（3）的六角头形成对边布置，在轨件开槽时，通过轨件开槽部位（5）对螺栓头或螺母六方对边限