The utility model provides a stepless spherical support that increases, is equipped with support body system, bridge floor height monitoring system, increases the system composition, bridge floor height monitoring system monitoring bridge floor height, and its characterized in that: increase system configuration in support body system below, the system that increases is by vertical thrustor, the double helix contact is vice, horizontal worm and gear transmission mechanism and bed plate are constituteed, be equipped with at least one vertical thrustor on the bed plate, vice and the horizontal worm and gear transmission mechanism of double helix contact, at least one vertical thrustor corresponds support body system's lower surface setting, and with the perpendicular jack -up of support bodysystem when increaseing, horizontal worm and gear transmission mechanism realizes the vice control of double helix contact, realize, has a self -locking function, vertical bearing stability is high.The height control is carried out in the change according to the bridge floor elevation, can realize to a high -profile or the low -key, and is unrestricted to guarantee the bridge floor ride comfort.