Safe and efficient blasting construction method for vertical shaft well wall beam socket

Abstract

The invention discloses a safe and efficient blasting construction method for a vertical shaft well wall beam socket. The method comprises the following steps that a plurality of blast holes distributed in an i x j matrix are formed in a main explosion zone in the center of the beam socket, wherein i and j are both an odd number and greater than or equal to 3; the blast holes in the most center serves as a first set of blast holes, a circle of blast holes which are closest to the periphery of the first set of blast holes are used as second set of blast holes, a circle of blast holes which areclosest to the periphery of the second set of blast holes are used as a third set of blast holes, and so on; the explosive charging mode of each set of blast holes is a detonation mode that a detonator is placed at the top low section, the detonator is placed at the high section of the bottom, and the section of the bottom high-section placement detonator in each group of blast holes is the same as the section of the top low-section placement detonator in the adjacent group of blast holes in the periphery of each group of blast holes. According to the blasting construction method, a pluralityof sets of blast holes are specially arranged in the main explosion zone of the beam nest, each blast hole adopts a detonator detonation mode with different top bottom sections, so that a multi-section gradient blasting mode is formed; each set of blast holes is connected to form a multi-order blasting net path; safe and efficient construction of the vertical shaft well wall beam socket is realized.

Description

technical field [0001] The invention relates to a safe and high-efficiency blasting construction method for beam nests on shaft walls. Background technique [0002] With the reduction or even exhaustion of shallow coal resources, coal mining gradually develops into deeper coal seams. As the passage connecting the ground industrial site with the underground roadway and working face, the shaft shaft is called the "throat" of the mine. The shaft wall is the most important supporting body of the shaft structure, and its stability is related to the safety of the shaft development period and service period. At the same time, in order to improve the construction progress of the shaft wall, the usual practice is to first construct the shaft wall to the water pocket at the bottom of the well, and then manually excavate the beam nest at a later stage. The main function of the beam sockets on the shaft wall is to provide support for the construction of the managed beams. There are a ...

AI Technical Summary

Problems solved by technology

The first method has a complete shaft wall structure, but the construction process is cumbersome; the second method has a fast construction speed, but the number of beams and nests is large, the labor intensity is high, and manual excavation is difficult; therefore, both methods have the construction efficiency of beams and nests. low limitations

[0004] Due to the unreasonable design of the blasting network and charge parameters of the conventional beam-and-hole blasting excavation method, the blasting effect is poor, and the disturbance and damage to the shaft wall structure are strong, resulting in cracking of the concrete shaft wall structure, which seriously affects the later use of the shaft. The safety of the service period often fails to achieve the desired effect

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