The present invention relates to the application of a horizontal gauge (water droplet horizontal gauge) that can check the level of the bridge device [Shoe] for supporting the bridge deck. More specifically, by attaching a horizontal gauge on the upper center of the upper metal plate of the chair and the bottom plate that can be visually checked even after completion of the chair, the real time without a separate tool or device to check the level of the chair when installing the chair. After the completion of the mounting, it is easy to check the horizontal state of the bridge device without a separate device so that the bridge device maintains a constant equilibrium so that the balance of force acted by the load of the bridge deck is constantly received. In addition to extending the life of the lower metal plate and rubber to fluorine resin plate, it relates to the attachment of the horizontal gauge to the bridge device to largely prevent damage to the bridge device and thereby shortening the bridge life.;To this end, the present invention is characterized by attaching a gauge that can check the level by making a groove on the upper central portion and the lower plate of the chair apparatus.
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