Shield tail gap measuring device for shield tunnel construction

The utility model discloses a shield tail gap measuring device for shield tunnel construction, which comprises a measuring unit and a calculating unit, and the measuring unit is in electrical signal connection with the calculating unit; the measuring unit comprises a mounting bracket, a laser distance measuring sensor and a laser contour sensor; the laser distance measuring sensor and the laser contour sensor are both fixed to the installation support and fixed to a supporting shoe of a shield tunneling machine through the installation support. The position of the laser distance measuring sensor is set to ensure that laser emitted by the laser distance measuring sensor is vertically emitted to a shield tunneling machine shell, and the position of the laser contour sensor is set to ensure that laser emitted by the laser contour sensor is vertically emitted to the inner edge of a shield tunneling machine ring piece between support shoes of a shield tunneling machine. The shield tail gapmeasuring device for shie