Blade retractable tube screen jacking drill bit

The invention discloses a bladed retractable tube screen jacking drill bit, including a connecting piece that connects the entire bladed retractable tube screen jacking drill bit with a spiral drill rod; including a blade at the foremost end of the entire bladed retractable tube screen jacking bit The main drill bit; includes a telescopic device with an adjustable length; includes a plurality of folding blades installed on the side wall of the telescopic device. When the length of the telescopic device changes, the shape of each blade changes; one end of the connecting piece is telescopic One end of the type device is fixedly connected, and one end of the main drill bit is fixedly connected to the other end of the telescopic device. In the present invention, the blades formed by the folding of the two hinged square rods increase the diameter of the drill bit, increase the damage range of the soil structure at the front end of the steel pipe compared with the ordinary drill bit, expand the diameter of the hole, and the amount of excavation is easier to control. The occurrence of jamming effectively controls the possible hidden dangers of construction quality, and makes it easier to adjust the guiding attitude of the pipe curtain steel pipe jacking and ensure the quality of the pipe curtain construction.