Large-diameter deep shaft reverse tunneling device and construction method

Abstract

The invention discloses a large-diameter deep shaft reverse tunneling device and a construction method. The large-diameter deep shaft reverse tunneling device comprises an excavation drill bit, a rotary lifting driving assembly and a drill rod, wherein two ends of the drill rod are detachably matched with the excavation drill bit and the rotary lifting driving assembly respectively, and the drill rod is a cylindrical drill rod; a plurality of notch grooves are formed in the rod wall of the drill rod, the notch grooves are parallel to the central axis of the drill rod, and the notch grooves are distributed around the central axis of the drill rod at equal intervals and equal radians. The invention further discloses a construction method using the tunneling device.

Description

technical field [0001] The invention relates to the field of tunnel excavation construction, in particular to a large-diameter deep shaft reverse excavation device and a construction method. Background technique [0002] The reverse excavation method is the excavation method often used in tunnel ventilation shafts and coal mine ventilation shafts. This excavation method is to dig a pre-excavated hole (circular hole, assuming the pre-excavated The diameter of the excavated hole is 20cm), and the pre-excavated hole is perpendicular to the tunnel. When excavating to the pre-excavated hole and the tunnel is connected, stop digging the pre-excavated hole, and then transport the excavation drill bit to the bottom of the pre-excavated hole in the tunnel, and then re-excavate Extend the driving rod (round, the diameter of the driving rod is smaller than the diameter of the pre-dug hole, when the diameter of the pre-dug hole is 20cm, the diameter of the driving rod is generally 15cm)...

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Problems solved by technology

[0002] The reverse excavation method is the excavation method often used in tunnel ventilation shafts and coal mine ventilation shafts. This excavation method is to dig a pre-excavated hole (circular hole, assuming the pre-excavated The diameter of the excavated hole is 20cm), and the pre-excavated hole is perpendicular to the tunnel. When excavating to the pre-excavated hole and the tunnel is connected, stop digging the pre-excavated hole, and then transport the excavation drill bit to the bottom of the pre-excavated hole in the tunnel, and then re-excavate Extend the driving rod (round, the diameter of the driving rod is smaller than the diameter of the pre-dug hole, when the diameter of the pre-dug hole is 20cm, the diameter of the driving rod is generally 15cm) from the ground to the excavation bit, and then insert the excavation bit Fix it on the driving rod, then pull the driving rod to the ground, and then rotate the driving rod, so that the pre-excavated hole can be expanded from bottom to top to the ground to form a vertical deep well. The diameter of the excavation hole, so the excavation bit is prone to eccentricity during excavation (it will cause the excavation rod to break), which leads to this excavation method only suitable for relatively small shafts with a diameter of less than 80cm. This excavation method is not suitable for large-diameter deep shafts with a diameter greater than 2m, and this drilling method is only suitable for excavating shafts in areas with relatively low sediment content in the formation. In large areas, due to the relatively large fluidity of the sand, the rotation of the excavation drill bit will cause the formation to vibrate, and the sand will flow as soon as the vibration occurs, and the shaft is prone to collapse, so this excavation method is not suitable for the mud in the formation. areas with high sand content

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