A rock drilling jumbo and a tunnel excavation method for reducing surrounding rock disturbance

Abstract

The invention provides a rock drilling jumbo, which includes a car body, a boom system, a drilling system, an operating platform system, and an execution end control system for controlling the drilling angle and depth of the drilling system; the boom system is installed on the car body The front part can swing vertically and horizontally to adjust the rock drilling position; the drilling system is installed at the end of the boom system; the working platform system is installed at the front end of the trolley body. The present invention also provides a tunnel excavation method for reducing surrounding rock disturbance. A circle of slot holes is arranged along the outer contour of the tunnel face to separate the tunnel face from the surrounding rock, so that the impact caused by excavation on the tunnel face cannot be transmitted. To the surrounding rock, thereby greatly reducing the disturbance to the surrounding rock, which is conducive to ensuring the stability of the surrounding rock, thereby reducing the workload and cost of high-pressure grouting to consolidate the surrounding rock. The present invention further divides the tunnel surface by using row drills to continuously cut grooves, which can achieve the effect of non-blasting excavation, and further reduce vibration and noise caused by tunnel excavation.

Description

technical field [0001] The invention relates to the technical field of tunnel drilling and blasting construction and urban building construction, in particular to a rock drilling jumbo and a tunnel excavation method for reducing surrounding rock disturbance. Background technique [0002] With the construction of the national transportation network, tunnel construction is increasing day by day, and the construction environment is becoming more and more complex. At the present stage, tunnel excavation is still dominated by blasting excavation. The blasting process has the most harmful disturbance to the surrounding rock, because the tunnel is buried deep underground and passes through various complex rock formations, and there is a close relationship between it and the surrounding rock mass. , the geological factors of the rock mass affect the stability and safety of the underground structure to a great extent. These factors include: the integrity of the surrounding rock, the...

AI Technical Summary

Problems solved by technology

In the existing technology, tunnel excavation shock absorption technology mostly reduces surrounding rock disturbance by arranging various shock absorption holes, slotted holes, positioning holes, etc. on the tunnel face. Disadvantages such as high height and large blasting vibration

[0003] The drilling and blasting method greatly disturbs the surrounding rock, and the cross-section, shape and direction of the blasting roadway are controlled by the surrounding holes to meet the design requirements, which will be affected by the bedding and joints of the surrounding rock, measurement and lofting errors, the accuracy of the blasthole excavation position, the structure of the rock drilling machine, Influenced by factors such as blasting methods and parameters, it is easy to cause over-under-excavation and irregular excavation contours

[0004] Conventional rock drilling rigs use rock drills to drill holes, which can only drill a single hole at a time. The drilling efficiency is low, and it is inconvenient to locate and cannot be connected into grooves. When drilling peripheral holes, there is an angle between the drilling direction and the direction of the hole axis, resulting The profile will spread radially outwards, making it impossible to excavate according to the ideal profile

[0005] like Figure 9 , 10 As shown, when using the ordinary rock drill 8 to drill holes, because the distance between the drilling center of the rock drill and the edge of the shell of the rock drill is relatively large, if it is necessary to ensure that the drilling direction of the rock drill is parallel to the axial direction of the excavated tunnel, after the first excavation of the drill hole 9 After excavating the borehole 10 with the rock drill for the second time, the excavation contour 17 for the third time will be smaller than the excavation contour 16 for the second time, and the excavation contour 16 for the second time will be smaller than the excavation contour 15 for the first time, thus causing the excavation The excavation radius gradually decreases, which affects the quality of the tunnel and also causes a large amount of under-excavation

[0006] like Figure 11 , 12 As shown, when drilling with an ordinary rock drill, because the distance between the drilling center of the rock drill and the edge of the shell of the rock drill is relatively large, if the tunnel profile is to be kept unchanged, there will be a certain angle between the drilling direction and the axis of the hole when drilling peripheral holes, resulting in The excavation profile spreads radially outwards, resulting in a larger overbreak area18

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