Hole bottom energy gathering and dissipating device suitable for inclined blast hole and capable of improving blasting excavation flatness of foundation surface

Abstract

A hole bottom energy gathering and dissipating device suitable for an inclined blast hole and capable of improving the blasting excavation flatness of a foundation surface. The hole bottom energy gathering and dissipating device comprises a polyvinyl chloride pipe (1). A gravel layer (7), an energy gathering and dissipating base (5), a kraft paper pad (4) and an energy gathering explosive layer (2) are arranged in the polyvinyl chloride pipe (1) in sequence from bottom to top. The pipe wall of the polyvinyl chloride pipe (1) is provided with energy gathering holes (3). A columnar groove (8) is formed in the center of the energy gathering explosive layer (2). The hole bottom energy gathering and dissipating device has the advantages that the device is arranged in the inclined blast hole, so that operation is fast and convenient, and a good blasting effect is guaranteed; since the advantages of energy gathering explosives and the advantages of the energy gathering and dissipating base are combined, the breaking effect on the bottom of the hole in the horizontal direction is better, damage to the bottom of the hole in the vertical direction is smaller, and the excavated foundation surface is smoother; all the structures are assembled into a whole through the polyvinyl chloride pipe with the energy gathering holes, so that transportation, arrangement during construction and batch production are facilitated, and the efficiency of blasting operation is improved; the excavated foundation surface is small in fluctuation, and the workload of manual excavation in a later period is reduced or even omitted.

Description

technical field [0001] The invention relates to the technical field of rock-soil blasting, in particular to a hole-bottom energy-gathering-dissipating device suitable for inclined blastholes and improving the flatness of blasting and excavation on foundation surfaces. Background technique [0002] In the rock-soil blasting and excavation process of large-scale civil engineering such as transportation, mining, water conservancy and hydropower projects, there are problems that need to be solved, such as rapid construction, excavation formation, and fine damage control when using blasting method to excavate rock mass. [0003] There are usually two types of drilling, vertical hole and inclined hole, in open-pit blasting. Although vertical hole drilling is easy to operate, the rate of large pieces after blasting is high, and the foundation is often left behind. The stability behind the blast pile is poor. The distribution of the resistance line of the inclined blast hole is rela...

AI Technical Summary

Problems solved by technology

In recent years, the sequential detonation method between holes with small steps with a flexible cushion at the bottom of the hole is often used. Due to the limited cushioning effect of the flexible cushion material on the blasting shock wave, the damage to the bottom of the hole is still relatively large, and the undulation of the excavated foundation surface is poor. Larger, resulting in a larger amount of manual excavation; the traditional shaped explosives and energy dissipation seats with concave holes at the bottom of the hole for the purpose of improving the flatness of the excavation surface are only suitable for vertical blastholes and are difficult to place , once the shaped charge or the energy dissipation seat at the bottom of the hole is not placed horizontally, it will not only lead to poor energy gathering effect, but even bring the opposite effect

Moreover, the traditional energy-gathering blasting at the bottom of the hole with concave holes can increase the crushing effect in the horizontal direction, but the energy-gathering effect of the device is limited, and the damage to the bottom of the hole is still great

If the bottom of the blast hole is excessively broken, the excavated foundation surface will be very uneven

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