Upwarp deformation limiting device capable of allowing longitudinal extension of track board and used for maintenance

The invention discloses an upwarp deformation limiting device capable of allowing longitudinal extension of a track board and used for maintenance. The limiting device is mainly used for the maintenance and repair process of a CRTS II type plate-type ballastless track and has the function of limiting upwarp deformation of the track board. The upwarp deformation limiting device comprises a buckling press plate, a force transfer pillow, a buckling press piece, a buckling press spring, a buckling press nut and a pull rod. The buckling press plate is pressed on the track board in a buckled mode. The bottom end of the pull rod penetrates through an elliptic bolt hole to be fixedly connected with a base plate. The upper portion of the pull rod penetrates through the buckling press plate, the force transfer pillow, the buckling press piece and the buckling press spring in sequence. A thread is arranged on the upper portion of the pull rod. The buckling press nut is connected to the upper end of the buckling press sp