Device for accurately positioning and welding tunnel lagging jack and connecting plate

A device for accurately positioning and welding a tunnel arch frame and a connecting plate comprises a positioner, a positioning bolt and a welding assisting piece, the positioning bolt and the welding assisting piece are fixedly installed on the positioner, the positioner is used for being connected with the tunnel arch frame, and the positioning bolt and the welding assisting piece are used for accurately positioning the connecting plate. The positioning device, the positioning bolt and the welding assisting piece are matched, the welding precision between the tunnel arch frame and the connecting plate is improved, meanwhile, the positioning bolt is arranged, the size of a screw hole in the connecting plate can be inspected, and therefore it is further guaranteed that the tunnel arch frame and the connecting plate are connected with other parts after being connected. 一种用于隧道拱架和连接板精确定位焊接的装置，包括定位器、定位螺栓和帮焊件，定位螺栓、帮焊件分别固定安装在定位器上，定位器用于与隧道拱架连接，定位螺栓、帮焊件用于对连接板进行精确定位，通过定位器、定位螺栓、帮焊件之间的配合，提高隧道拱架、连接板之间的焊接精度，同时通过定位螺栓的设置，可