A soft rock and soil layer
jet flow guiding hole forming-chamfering-hole collapse preventing integrated drilling method comprises the following steps that firstly, a soft rock and soil layer
jet flow guiding hole forming-jet chamfering-hole collapse preventing guniting integrated drilling device is machined and tested; secondly, drilling technical parameters are designed; thirdly, guniting collapse preventing
slurry fluid is prepared, and the solidification performance of the
slurry fluid is tested; fourthly, the integrated drilling device is installed; fifthly, integrated drilling work is carried out; sixthly, after the design depth is achieved, drilling is stopped,
clean water is used for cleaning a guniting pipeline and a
slurry liquid
nozzle, and a rod bit is pulled out; seventhly, the drilling effect is detected. The drilling efficiency and the hole forming quality of a horizontal or oblique long
drill hole in the ground and an underground soft rock soil layer are greatly improved, the construction time for the horizontal or oblique long
drill hole in the soft rock soil layer is shortened, and collapse destruction time of the horizontal or oblique long
drill hole in the soft rock soil layer is greatly prolonged; the drilling track deviation of the horizontal or oblique long
drill hole in the soft rock soil layer is reduced.