Air hood for MJS construction method and MJS construction method drill bit

The invention relates to an air hood for an MJS construction method and a drill bit for the MJS construction method. The air hood is additionally arranged on the drill bit for the MJS construction method. The MJS construction method drill bit comprises a sealing ring (2). The air cover comprises a gasket (1); the gasket (1) is arranged on the outer side of a sealing ring (2) of the MJS construction method drill bit in a sleeving mode. The gasket (1) is used for protecting a sealing ring (2) of the MJS construction method drill bit from being damaged by compressed air. Compared with the prior art, the hard air cover is additionally arranged to protect the sealing ring (2), and the situation that the sealing ring (2) is damaged by high-pressure air and construction of the MJS construction method is affected can be effectively avoided. 本发明涉及一种用于MJS工法的空气罩及MJS工法钻头，所所述空气罩加装在MJS工法钻头上；所述MJS工法钻头包括密封圈(2)；所述空气罩包括垫片(1)；所述垫片(1)套设于MJS工法钻头的密封圈(2)外侧；所述垫片(1)用于保护MJS工法钻头的密封圈(2)不被压缩空气破坏。与现有技术相比，本发明通过加设硬质的空气罩，保护密封圈(2)，能够有效避免密封圈(2