SU1638310A1 - Method of core drilling of large-diameter holes - Google Patents

Abstract

The invention relates to the construction of mine shafts, ventilation ducts, pits, bored piles and m. used in mining, construction and exploration of mineral deposits. The purpose of the invention is to increase the safety of core drilling by reducing the frequency of contact with the charge of staff. For this purpose, the pilot well 1 is drilled to the depth and along the axis of the well 2 of large diameter. Gather in charge 3 of charge 3 at an interval corresponding to the length of the trip ditch. A garbage tail of charge 3 is lowered on the cable 4 into the pilot well and held in suspension. Together with the charges 3, pilot well 1 is lowered to its outlet by means of the pipe 5, which is fed with a fast-hardening solution. The composition of the pipes 5 is removed. After the solution is set, regular holes of large diameter wells begin to be drilled with a core drill (KB) 7 A rod 8 with a bit 9 is fixed inside it, which is drilled solution 6. Placed on a cylindrical body 10 KB 7 bits 11 destroy the rock to the bottom hole 2. When the bit 9 comes into contact with charge 3, the axial load is transferred to the charge body 3. This triggers the fuse and explodes the cumulative cartridges 12. Cumulative jets affecting the core walls 13, section t it from rock massif. Kern 13 capture device, for example, the collet, placed inside the housing KB 7, and together with the drill lift to the surface. 2 Il. sl C camp (l 00 CO

Description

The invention relates to the construction of mine shafts, ventilation ducts, pits, bored piles and can be used in mining, construction and in the exploration of mineral deposits.

The purpose of the invention is to increase the safety of core drilling by reducing the frequency of contact with the charge of staff.

Figure 1 shows a large-diameter well with a pilot well and a barrel of charge placed therein, a section; figure 2 - node I in figure 1 (when filling the pilot borehole with a quick-hardening solution through becoming pipes).

The method of core drilling of large diameter wells is carried out as follows.

The pilot borehole 1 is drilled to the depth and along the axis of the borehole 2 of large diameter. Charge 3 is collected in a beater, for which they are successively connected on the surface with a cable A. Each charge 3 consists, for example, of several radially mounted cumulative cartridges and a pressure fuse placed in a housing. 3 is lowered on the cable 4 into the pilot well and kept suspended, while the lower one in the core is placed on the bottom of the pilot well, and the remaining charges are arranged at intervals corresponding to the length of the trip hole of the large well 2. Together with charges 3, pilot well 1 is lowered to its stand by pipes 5, through which a quick-hardening solution 6 is fed into it, for example, an alumina-cement mixture with the addition of liquid glass. Before the moment of setting of the solution, the pipes 5 are removed from the pilot well to the surface. The removal of the position of the pipes 5 from the pilot well 1 can also be carried out simultaneously with the supply of the solution 6 into it.

After the solution has set, when the charges 3 are firmly fixed in the pilot well, the external suspension of the needle is removed and the regular holes of the large diameter well begin to be drilled with a core drill 7, inside which the rod 8 is fixed with a bit 9, which is drilled with the accumulated structural strength solution 6 Placed on the cylindrical body 10 of the core drill 7 bits 11 destroy the rock at the bottom of the well 2

large diameter. When the bit 9 comes into direct contact with charge 3, the axial load is transferred to the charge body, which causes the fuse to operate and explode thereupon cumulative cartridges 12. The cumulative jets, acting on the core walls 13, separate it from the mountain massif breeds. The core 13 is captured with a special device 14, for example, with the collet located inside the corps of the core drill 7, and together with the auger they are lifted to the surface. After the release of the core core drill 7 again lowered into the well 2 large diameter

to continue its deepening. The number of voyages is determined by the number of charges placed in the mainland. If charge 3 in contact with bit 9 does not work for any reason, recess well 2

large diameter continue until it is completely drilled.

The proposed method of core drilling of large diameter wells can significantly improve the safety

works in the field drilling and separation of cores by charges due to the elimination of large-diameter contacts with surface charges in the course of deep well drilling, as well as works to eliminate unexploded charges.

Claims (1)

The invention method of core drilling large diameter wells, including drilling pilot wells, cruise well coaxially with a core hole, placing the charge in the pilot well, separating the core from the array at the end of each flight by blasting this charge, capturing and removing the core from the well with the core drill, characterized in that in order to improve the safety of core drilling by reducing the frequency of contacts with charge, I serve personnel placed in the pilot well, the charges of a cumulative effect are successively connected into one well with an interval corresponding to the length of the trip ditch, and the placement of the arm The charges into the pilot well are carried out by lowering it to the full depth while simultaneously filling the pilot well with a quick-hardening solution, while the deepening is carried out after setting a solution of a core drill equipped with a pilot bit, and the blasting of the charge is carried out by contacting the pilot bit with it. (Reg. I