Axial Embedded Blasting Hole and Demolition Blasting Method of Reinforced Concrete Column
A technology of reinforced concrete columns and blastholes, which is applied in blasting demolition of reinforced concrete columns and axial pre-buried blastholes of reinforced concrete columns to achieve the effects of reducing dumb shots, avoiding noise pollution, and reducing workload
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Embodiment 1
[0036] The height of the square reinforced concrete column is 5m, and the cross-sectional size is 0.6m×0.6m. A PVC pipe with a diameter of 32 mm is pre-embedded and arranged on the longitudinal central axis of the column as a pre-embedded blast hole, with a length of 5 m, and the upper opening is at the upper end of the column. On the cross section, the lower part communicates with a PVC horizontal embedded pipe with a diameter of 32 mm. The diameter of the emulsion explosive roll is 25 mm, the length is 0.2 m, and the discontinuous charge structure is adopted, the distance between the charge rolls is 0.15 m, and the detonating cord is arranged in the whole hole.
[0037] According to the axial pre-buried blasthole and blasthole charge structure, the construction process of the present invention is:
[0038] 1) Destroy the concrete protective layer, find the upper opening of the PVC pre-embedded pipe, and clean the pipe with compressed air; the muck is discharged from the hori...
Embodiment 2
[0042] The circular reinforced concrete columns are 20m high and 2m in diameter. The pre-buried blast holes are arranged in two sections, each section is 10m high. In each section, one PVC pipe with a diameter of 38mm is pre-buried and arranged on the axis of the column. The hole is not filled with medicine and is only used as a free surface; the lower part of the other four PVC pipes with a diameter of 32mm is evenly arranged. The center of the circle is the same as that of the cylinder and the diameter is 1.3 The cylinder surface of m and parallel to the longitudinal axis of the column are used as blastholes; the four blastholes are bent toward the diameter direction of the cross section at the upper end, with a bending radius of 3m, and are opened on the side of the column; the lower part of each blasthole has a diameter of The 32 mm PVC horizontal embedded pipe is connected. The pre-buried blast hole adopts a continuous charge structure, and the detonating cord is arrange...
Embodiment 3
[0048] The equilateral triangular reinforced concrete columns are 9m high and 1.1m side long. A PVC plastic pipe with a length of 8.8m and a diameter of 40mm is used as a blast hole, which passes through the centroid of the cross section and is pre-buried on the upper longitudinal axis of the column. The upper end opens on the cross section of the top end of the column. The PVC horizontal embedded pipe with a diameter of 32 mm is connected. The blast hole adopts a discontinuous charge structure, with a diameter of 32mm emulsion explosive coil, the coil length is 0.2m, and the distance between the coils is 0.1m. The detonating cord is arranged in the whole hole, and there is gun mud plugging.
[0049] According to the above-mentioned axial pre-buried blast hole and blast hole charge structure, the construction process of the present invention is:
[0050]1) Destroy the concrete protective layer, find the PVC pre-embedded pipe, and clean the pipe with compressed air; the muck i...
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Abstract
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