Shaft deepening technology and construction plan
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The excavation process of the deep shaft working face is similar to that of the vertical excavation, except that the deepening project is carried out under the normal lifting of the original wellbore, and thus has the following:
( 1 ) The upper part of the same wellbore is lifted as usual, and the lower part is deepened, and mutual interference must be minimized.
(2 ) When the equipment is extended, the arrangement is very difficult due to the narrow space and the limitation of the arrangement of the wellbore equipment. When arranging, permanent roadways and diverticulum around the wellbore should be used as much as possible to reduce the amount of temporary work.
( 3 ) It is necessary to take safety technical measures (such as reserve protection rock pillars or construct artificial protection panels) to ensure the safety of workers on the working face.
  ( 4 ) The depth of the wellbore is generally connected to the production section at the end, so it is necessary to strengthen the measurement of the deep wellbore.
2. Shaft deepening construction scheme The following factors should be considered when selecting the shaft deepening construction scheme: the original design requirements of the mine and the conditions of the wellbore; the geological and hydrogeological conditions of the deepening section; the technical strength and construction equipment for deepening construction; Etc., according to the conditions of each wellbore, combine the above factors and the advantages and disadvantages of the various extension schemes and applicable conditions, select the construction scheme, and if necessary, carry out technical and economic comparison of two better schemes.