Settlement control method and construction device for tunnel

The invention belongs to the field of tunnel construction, and particularly relates to a tunnel settlement control method and a construction device.The settlement control method comprises the following steps that S1, a shield launching bracket and a counter-force frame are installed, meanwhile, assembly of a shield main machine is completed, and tunnel portal sealing installation is completed; s2, an additive is properly injected according to the surrounding rock condition in shield construction, and the fluidity and watertightness of the muck are ensured; the defoaming tank, the vacuum pump, the exhaust pipe, the rotating shaft, the motor, the feeding hopper and the stirring blades are arranged, the motor drives the rotating shaft and the stirring blades to rotate, the stirring blades rotate to continuously stir mortar, the overall defoaming effect is improved, after defoaming is completed, the mortar in the defoaming tank is pumped through the grouting pump, and then grouting is conducted through the grouti