The invention relates to an all-cross-section
cutting rectangular
pipe-pushing
machine cutting mechanism used in rectangular
pipe-pushing devices used in non-excavation
engineering. The mechanism comprises an installing seat, four cutterheads with
cutting surfaces located on the same plane are installed on the front end face of the installing seat, centers of rotating shafts of the four cutterheads are respectively located on four vertexes of a square and are driven by an identical spindle located at the center of the installing seat to synchronously rotate at a uniform speed, the end
face contour of every cutterhead is a long shape with the dimension in the length direction larger than the dimension in the width direction, cutting blades are arranged on the edge of the cutterheads, the length direction of every cutterhead is perpendicular to the length direction of the cutterheads adjacent to the cutterhead, the maximum cutting
radius of every cutterhead and the maximum cutting
radius of the adjacent cutterhead have an overlapped part, and the four cutterheads do not interfere with each other when rotating synchronously at the uniform speed. Rectangular all-cross-section cutting can be achieved, the all-cross-section cutting rectangular
pipe-pushing
machine cutting mechanism is high in difficulty overcoming capability, simple in structure and high in reliability, the technical requirements for constructors are low, and
soil mass is mixed fully.