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Frozen earth blasting construction method of large-diameter vertical well in deep and thick alluvium

A construction method and large-diameter technology, applied in blasting and other directions, can solve problems such as long construction period, achieve rapid blasting, reasonable layout, and improve the utilization rate of blast holes

Active Publication Date: 2021-01-08
河南隧通工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a deep alluvium blasting construction method for large-diameter shafts in permafrost, to at least solve the problems of the current blasting construction method in permafrost with a long construction period.

Method used

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  • Frozen earth blasting construction method of large-diameter vertical well in deep and thick alluvium
  • Frozen earth blasting construction method of large-diameter vertical well in deep and thick alluvium
  • Frozen earth blasting construction method of large-diameter vertical well in deep and thick alluvium

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Embodiment 1

[0041] According to specific embodiments of the present invention, such as Figure 1-2 Shown, the present invention provides a kind of deep and thick alluvial layer large-diameter vertical shaft permafrost blasting construction method, the thickness of deep and thick alluvial layer in the present invention is not less than 400m, and the excavation waste path scope of shaft is 8-10m (excavation waste path can be 8m, 8.4m, 8.5m, 9m, 9.4m, 9.5m, 9.9m, 10m, etc.), the vertical shaft blasting effect has a great influence on the construction period, post-blasting forming, formwork support and other construction techniques. Based on the basic principle of smooth blasting, the best blasting effect can be achieved by optimizing the layout of blastholes, charge parameters, and initiation methods; the vibration of the shaft wall should be within a reasonable range to reduce damage to the shaft wall; blasting The size of the rear block is appropriate, which is convenient for shoveling and...

Embodiment 2

[0060] The blasting parameters in the frozen soil blasting construction method in the above-mentioned embodiment 1 are a rough range, which can be selected according to the actual situation in the construction. In Example 2, taking the excavation of a shaft with a barren diameter of 9.4m and maintaining the temperature of the permafrost at -10°C as an example, a set of blasting parameters with better blasting effects is designed. The optimized blasting parameters can achieve better blasting effects and ensure cycle footage, to achieve rapid blasting of shafts. The amount of explosives loaded in a single hole of the first-level cut hole 1 and the second-level cut hole 2 is 1.4kg; the amount of explosives loaded in a single hole of the auxiliary hole three 3 is 1.75kg; The amount of explosives is 2.1kg; the amount of explosives installed in a single hole of the auxiliary hole five 5 is 2.8kg; the amount of explosives installed in a single hole in the peripheral hole seven 7 is 0...

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Abstract

The invention provides a frozen earth blasting construction method of a large-diameter vertical well in a deep and thick alluvium. The construction method comprises the following steps that S1, the vertical well is constructed through a freezing method; two circles of cutting holes, four circles of auxiliary holes and a circle of peripheral holes are drilled from inside to outside according to thedesign range of the tunneling diameter of the vertical well, wherein the four circles of auxiliary holes are sequentially third auxiliary holes, fourth auxiliary holes, fifth auxiliary holes and sixth auxiliary holes from inside to outside, and the circle of peripheral holes are seventh peripheral holes; S2, after being drilled, the holes are cleaned through a high-pressure air gun; S3, energy-gathering pipes and loess stems are sequentially filled in the cutting holes, the auxiliary holes and the peripheral holes from the bottoms to the openings of the holes, wherein cartridges are arrangedin the energy-gathering pipes, the loess stems are filled with water stems, and slots are formed in the peripheral surfaces of the energy-gathering pipes in the axial direction and are away from the two axial ends of the energy-gathering pipes; and S4, the cutting holes, the auxiliary holes and the peripheral holes are detonated sequentially from inside to outside.

Description

technical field [0001] The invention belongs to the technical field of blasting in frozen soil, and in particular relates to a blasting construction method in deep and thick alluvial layer and large-diameter shaft in frozen soil. Background technique [0002] With the widespread use of shaft freezing method, more stringent requirements are put forward for blasting technology in frozen soil. Because the frozen drilling and blasting method has the characteristics of flexibility, simplicity, less consumption, and much greater adaptability to complex underground conditions, it has achieved good results in actual engineering, so frozen soil blasting technology is the focus of current research. [0003] Taking the westerly shaft of Zhaogu No. 2 Mine as an example, the thickness of the alluvial layer in the westerly shaft of Zhaogu No. 2 Mine is 704.6m, of which the surface soil thickness of the clay layer reaches 620m. , excavation section 78.5m 2 , set a circle of cut holes, th...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/04
CPCF42D1/00F42D3/04
Inventor 于建新刘焕春郭敏褚怀保张英才高帅杰王晓董保立吴冬冬梁昕赵泽峰
Owner 河南隧通工程技术有限公司
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