Device special for in-hole positioning, orientating and propelling of tunnel directional fracture blasting shaped charge

Abstract

The invention discloses a device special for in-hole positioning, orientating and propelling of a tunnel directional fracture blasting shaped charge. The device is formed by assembling main components such as a hollow gun pole provided with a positioning scale and a sliding positioning ring, an orientating sleeve provided with an orientating sliding groove and a bayonet, an orientating push rod of which the two ends are respectively connected with an orientating handle and a circular cartridge baffle piece, and the like. By the device, a shaped tube kerf in a blast hole is orientated precisely out of a hole by adjusting the direction of the handle, and the angle deviation can be controlled within the range of 5 to 10 degrees, so that a blasting fracture surface in a good shape is obtained; and the device has a simple overall structure and does not have special requirements on a conventional drilling process, and is convenient to operate and beneficial to promotion of the engineering application of an orientated shaped blasting technology.

Description

technical field [0001] The invention relates to a pushing device, in particular to a special device for locating, directional and pushing inside a hole of a shaped charge charge in tunnel directional fracture blasting. Background technique [0002] Since the late 1950s, smooth blasting technology has emerged in Sweden, and has since been widely promoted and applied in countries all over the world. At present, photoexplosion technology is generally used in tunnel construction at home and abroad, and the quality of tunnel formation has been greatly improved. However, because explosive cracks are easy to develop along the original cracks and joints of rock mass, the expansion of explosive cracks has great randomness and Uncertainty, difficult to control the fracture direction, serious damage to the surrounding rock, large contour unevenness, low half eye mark rate in the peripheral eye, especially in weak and broken rock mass, serious over and under excavation, poor forming qua...

AI Technical Summary

Problems solved by technology

[0012] (1) Although scientific and technological workers at home and abroad have proposed various types and materials of shaped charges or slit charges, a large number of research results have been obtained in indoor experiments and theoretical research on shaped blasting technology. , water conservancy and hydropower projects, slopes, open-air steps and other deep hole blasting have been popularized and applied to a certain extent. However, due to the complex structure of the shaped charges or the immature on-site construction technology, the field application of rock mass engineering blasting is still seldom, especially in the current rapid development. The application of drilling and blasting construction in expressway and high-speed railway tunnel engineering is basically blank

[0013] (2) In terms of on-site shaped energy blasting construction technology, the key is that there is no professional device for positioning and orientation of shaped charges that are suitable for longitudinally uncoupled interval charges, and it is difficult to orient the shaped holes in the blast hole.

When the traditional wooden or plastic gun rod is used to push the shaped tube into the horizontal blasthole, the charge will rotate due to the friction of the blasthole wall or the obstruction of residual drilling debris, which cannot guarantee that the shaped jet will expand along the design contour.

Unable or inaccurate orientation of the slit charge in the hole will result in a poorer blasting effect than traditional smooth blasting

[0014] (3) A dedicated orientation adjustment rod for energy-concentrating tubes composed of gun rods and directional devices fixed at the ends of the gun rods ("Accurate Orientation Fracture Blasting Energy-Concentrating Tubes and Orientation Adjusting Rods" (application number: 98221962.8)), to a certain extent Above all, it solves the problem of controlling the kerf direction during the charging process, but this device uses the positioning gap or groove at the end of the energy-collecting tube to embed the adjustment chuck to orient the kerf. On the one hand, additional grooves need to be processed at the end of the energy-collecting tube. On the one hand, it is easy to slip off during the process of pushing the energy-concentrating tube into the blast hole, and it is extremely difficult to re-align, which leads to poor operability on site and low work efficiency

There are no reports of large-scale promotion and application of related large-section horizontal uncoupled interval-charge concentrated energy blasting technology.

[0016] (5) Due to the lack of special positioning and orientation devices for shaped charge packs, it brings troubles to on-site charge and construction, and limits the wide application of shaped charge blasting technology in engineering

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