Vertical shaft wall structure in bad stratum and construction device and method

Abstract

The invention relates to a vertical shaft wall structure in a bad stratum and belongs to mine vertical shaft construction. The vertical shaft wall structure comprises a shaft arranged in the bad stratum and is characterized in that the upper shaft collar section of a vertical shaft is provided with a high-pressure-jet-grouting curtain pile shaft wall structure, a bedrock section is provided with a positioning targeting grouting section shaft wall structure and a shaft wall, and the upper and lower shaft wall structures are concentric, identical in diameter and tightly integrally connected to protect the shaft wall; the high-pressure-jet-grouting curtain pile shaft wall structure is provided with at least three circles of annular high-pressure-jet-grouting curtain walls with sealed heads and tails on the periphery, 0.6m away from a shaft outer diameter line, of the shaft outer diameter line by using the center of the shaft as the circle center, the positioning targeting grouting section shaft wall structure is provided with at least 8 positioning targeting grouting sections, vertical to the ground, on the periphery, 2m away from the shaft outer diameter line, of the shaft outer diameter line, and the two wall structures protect the shaft wall. The vertical shaft wall structure has the advantages that the vertical shaft wall structure is novel in concept, simple, stable and reliable; the high-pressure-jet-grouting curtain walls and the positioning targeting grouting sections protect the shaft wall, bearing capacity and deformation resistance are enhanced, and a good water blocking effect is achieved; the vertical shaft wall structure is fast and convenient in construction, fast shaft construction can be achieved, cost can be saved, and mine production can be performed safely and smoothly.

Description

Technical field: [0001] The invention belongs to mine vertical shaft construction, and in particular relates to shaft wall structures and construction methods in unfavorable formations. Background technique [0002] In underground mining, the vertical shaft is an important passage for lifting, ventilation, transportation, drainage and personnel safety connecting the underground and the surface. The shaft is directly connected to the surface and directly bears all the loads of the shaft lifting facilities. Therefore, it is necessary to ensure that the shaft shaft structure has sufficient bearing capacity. strength and resistance to deformation. The vertical wellbore is from top to bottom: the well neck, the well body and the bottom of the well. With the rapid development of the global mining industry, the proportion of underground mining is increasing, the shafts are getting deeper and the formations they pass through are becoming more and more complex. The unfavorable form...

AI Technical Summary

Problems solved by technology

The soil replacement method is used to strengthen the structure. First, the thick water-containing backfill topsoil layer is completely excavated, the well wall structure is poured, and then the homogeneous soil is backfilled layer by layer. The disadvantages are: the surface excavation area is large, and it is difficult to Difficult to excavate in a large area; layered backfill with homogeneous soil has a long construction period and high cost

The freezing method strengthens the structure by drilling one or two circles of freezing holes from the surface to the bottom of the stable rock formation or wellbore for 10m to 20m, setting up frozen steel pipes in the entire hole in the freezing holes, and arranging a freezing station on the surface to circulate the refrigerant through the frozen steel pipes. It is transported to the bottom of the freezing hole, so as to reach the surrounding rock around the freezing shaft, so as to achieve the purpose of preventing seepage and strengthening the surrounding rock. The disadvantages are: the freezing system equipment has a long construction period, high cost, and large power consumption

The grouting method of the wellbore working face is that when the wellbore working face is close to the unfavorable aquifer, the excavation is stopped, and about 10m is left to prevent the magmatic rock from rising or the concrete grouting pad is poured, and the drilling is arranged in the wellbore working face, and the working face is grouted. The disadvantages are that the power of the grouting pump in this method is small, the grouting capacity is small, the grouting material consumption is high, and it is difficult to block the water in the crack channel. After the wellbore is excavated, the water inflow is still large, and the water gushing from the crack will drive the surrounding rock to collapse. , causing disaster

Practice shows that the above three methods all have the defects of long construction period and high cost, which seriously affect production

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