Method for controlling deformation of bridge during construction of tunnel close to foundation of bridge

The invention discloses a method for controlling deformation of a bridge during construction of a tunnel close to foundation of the bridge. The method comprises the following steps of carrying out grouting and pre-reinforcing on soil mass on the outer side of a pile foundation of the bridge and in the certain range of the bottom of the bridge before the tunnel is about to be excavated to the pile foundation of the bridge; monitoring beam bodies of the bridge and/or an engineering parameter of the foundation while excavating the tunnel; and increasing the height of a bracket for supporting the beam bodies of the bridge when the engineering parameter reaches a preset threshold so that the beam bodies reach the preset height. According to the method for controlling the deformation of the bridge during the construction of the tunnel close to the foundation of the bridge, disclosed by the invention, the deformation of the bridge and the settlement of the bridge foundation can be reduced.