Reinforced slotting correction structure and slotting method

Abstract

The invention relates to the technical field of tunnel rock mass driving blasting engineering, and discloses a reinforced slotting correction structure and a slotting method. According to the reinforced slotting correction structure, two reinforced slotting holes (1) are vertically formed in the positions, away from a base plate by a specific distance, of the midpoint of a tunnel center line slotted cavity. Three pairs of main slotting holes (2) and two pairs of correction slotting holes (3) are symmetrically formed in the two sides of the reinforced slotting holes (1) so as to form a compoundreinforced vertical wedge-shaped cut. The main slotting holes (2) are in the shape of a wedge with the hole opening distance being large and the hole bottom distance being small. The longitudinal section of each correction slotting hole (3) is a rectangle, and the cross section of each main slotting hole (2) is an isosceles trapezoid. The depth of the reinforced slotting holes (1) is smaller thanthat of the correction slotting holes (3). The depth of the correction slotting holes (3) is smaller than that of the main slotting holes (2). By means of the reinforced slotting correction structureand the slotting method, the phenomenon that blasting is not ideal due to the large tunnel width or high rock hardness can be reduced, the blasting effect is good, and a reference is provided for blasting tunneling construction work of tunnels of the same type.

Description

technical field [0001] The invention relates to the technical field of tunnel rock excavation and blasting engineering, in particular to a structure for strengthening and correcting a cut and a cut method. Background technique [0002] In the tunnel blasting and excavation construction, the wedge-shaped cutting method is often used, because this cutting method is easy and easy to operate, but when the tunnel width is large or the rock hardness is high, the blasting efficiency is often unsatisfactory. The main reason for this problem is that the cutting is difficult, and the quality of the cutting determines the blasting efficiency. A good cutting method can improve the blasting effect and increase the blasting efficiency. Contents of the invention [0003] The invention provides a reinforced cut correction structure and a cut method, which solves the technical problem in the prior art that the blasting efficiency is often unsatisfactory when the tunnel width is large or th...

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Problems solved by technology

[0003] The invention provides a reinforced cut correction structure and a cut method, which solves the technical problem in the prior art that the blasting efficiency is often unsatisfactory when the tunnel width is large or the rock hardness is large in the wedge-shaped cut method.

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