The invention discloses a
water jet forcible entry and
diameter expansion heading
machine and a construction method thereof, and solves the problem of low working efficiency of forcible entry and expanding excavation of an original pipeline in the prior art. The
water jet forcible entry and
diameter expansion heading
machine comprises a tunneling main
machine and rear corollary equipment, an expanding excavation cutterhead is arranged at the front end of the tunneling main machine, the expanding excavation cutterhead is connected with a main drive arranged in the tunneling main machine, a pipeline forcible entry device is arranged on the expanding excavation cutterhead, and a
water jet rock breaking mechanism is arranged on the pipeline forcible entry device and / or the expanding excavationcutterhead; and the water jet
rock breaking mechanism is connected with a high-pressure water
system, and the expanding excavation cutterhead corresponds to a deslagging
system. According to the water jet forcible entry and
diameter expansion heading machine, the pipeline forcible entry device and the water jet
rock breaking mechanism are used for conducting suspension
cutting and water jet typerock breaking on an original pipeline in advance for forcible entry, the expanding excavation cutterhead and the water jet rock breaking mechanism are used for conducting
extrusion and water jet typerock breaking on an original pipeline tunnel later for diameter expansion, forcible entry and diameter expansion one-time forming is completed, the rock breaking efficiency is high, and the construction efficiency is greatly improved.