PJSC North Ore Mining and Processing Plant (SEVGOK)
At the Northern Mining and Processing Plant, PE “SVITEKS” completed the construction of the underground part of the CPT in the Pervomaisky quarry. In total, the enterprise has passed more than 43 thousand meters 3 of mine workings, most of which are inclined shafts for conveyors LK-1, LK-2, LK-3 and LK-4 with a cross section of 21.6 sq. m. The work was carried out by drilling and blasting method using Atlas Copco self-propelled equipment.
Downhole drilling of the inclined shaft was carried out by Boomer-282 drilling rig with two perforators. Hole diameter - 45 mm, length - 2.5 m, number of holes per face - 92 pcs. The gathering of rock mass was carried out by load-and-dump machines ST-1030 with a maximum bucket capacity of 10 tons. In order to avoid slipping of the wheels of self-propelled vehicles due to the large angles of inclination of the trunks (15-16 degrees), chains were installed on the wheels. The excavation was fixed with SVP-27 metal arch support with a support step of 0.5-1 m, followed by concreting, the thickness of which is 250 mm. Concrete was laid using concrete pumps BN-1. To waterproof the lining of the excavation, works were carried out to fill the voids between the lining and the rocks with cement mortar.
The following Atlas Copco equipment was used for sinking:
- self-propelled drilling carriage Boomer-282 - 2 pcs.
- load-and-dump machine ST-1030 - 2 pcs.;
- concrete pump BN-1 -2 pcs.;
- grouting pump UnigroutMiniflex - 1 pc.;
- compressors Dalgakiran-75 - 2 pcs.
A unique tunnelling of two sections of inclined shafts with a length of 100 m each was carried out using a special method on bulk rocks under the existing railway tracks. As a special method, the so-called “Spanish Umbrella” was chosen - drilling protective screens from pipes with a diameter of 89 mm and a length of 15 m, followed by grouting.
Downhole drilling of the inclined shaft was carried out by Boomer-282 drilling rig with two perforators. Hole diameter - 45 mm, length - 2.5 m, number of holes per face - 92 pcs. The gathering of rock mass was carried out by load-and-dump machines ST-1030 with a maximum bucket capacity of 10 tons. In order to avoid slipping of the wheels of self-propelled vehicles due to the large angles of inclination of the trunks (15-16 degrees), chains were installed on the wheels. The excavation was fixed with SVP-27 metal arch support with a support step of 0.5-1 m, followed by concreting, the thickness of which is 250 mm. Concrete was laid using concrete pumps BN-1. To waterproof the lining of the excavation, works were carried out to fill the voids between the lining and the rocks with cement mortar.
The following Atlas Copco equipment was used for sinking:
- self-propelled drilling carriage Boomer-282 - 2 pcs.
- load-and-dump machine ST-1030 - 2 pcs.;
- concrete pump BN-1 -2 pcs.;
- grouting pump UnigroutMiniflex - 1 pc.;
- compressors Dalgakiran-75 - 2 pcs.
A unique tunnelling of two sections of inclined shafts with a length of 100 m each was carried out using a special method on bulk rocks under the existing railway tracks. As a special method, the so-called “Spanish Umbrella” was chosen - drilling protective screens from pipes with a diameter of 89 mm and a length of 15 m, followed by grouting.
