A safe and efficient blasting construction method for shaft wall beam sockets

Abstract

The invention discloses a safe and high-efficiency blasting construction method for beam nests on shaft walls, which comprises: opening a plurality of blast holes distributed in an i×j matrix in the main blasting area at the center of the beam nests, wherein i and j are both odd numbers and greater than or It is equal to 3; the most central blast hole is used as the first group of blast holes, the nearest ring of blast holes on the periphery of the first group of blast holes is used as the second group of blast holes, and the nearest ring of blast holes on the periphery of the second group of blast holes is used as The third group of blastholes, by analogy, the charge form of each group of blastholes is the detonation method of the top low-section detonator and the bottom high-section detonator, and the bottom high-section detonator in each group of blastholes and the nearest group of peripheral detonators The section of the top low section detonator in the blasthole is the same. In the present invention, multiple groups of blastholes are specially arranged in the main explosion area of ​​Liangwo, and each blasthole adopts the detonation method of detonators in different sections on the top and bottom, forming a multi-stage gradient blasting method, and each group of blastholes is connected to form a multi-stage blasting method. The blasting network has realized the safe and efficient construction of the shaft wall beam nest.

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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