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Coal Deposits' Mining with High Content of Natural Radionuclide

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Coal Deposits' Mining with High Content of Natural Radionuclide Selection of A Rational Form for The Steel Winding Tower as A Preventive Measure to Increase Its Industrial Safety KASSIKHINA Elena.G.,1 PERSHIN Vladimir V.1, BUTRIM Nikita O.2, Qiao Weiguo3 1.Mining Institute, T.F. Gorbachev Kuzbass State Technical University, 650000 Kemerovo, Russia；2.Department of Capital Construction and Investment Activities ‘UK Michel Mining’125993 Moscow, Russia；3.Shandong Science and Technology University, People's Republic of China Abstract of loads for winding towers, which Herein there is a new approach to Kuzbass mines will need in the nearest improve industrial safety in terms of future, the most popular are the winding operation of the steel winding tower towers for ventilation and auxiliary shafts based on rational design solutions. of 7 ч 8m diameter with the marked Keywords: Industrial safety, corrosion, center of the hoisting pulley +34,000 m defects, multi-functional steel jibs of ч +36,000m. winding towers-. The available winding towers operating under similar conditions, as a rule, are 1. Introduction four-pole and rig type (Fig. 1). The results In the complex of mine structures a of the expert appraisal [1] of their winding tower takes a special place. technical condition showed that most of Besides the fact that it is a high structure, the available structures have no access for designed to provide position of the rust removal and protective coating pulleys of the hoist at a certain level, it is renewal. All these cause intensity of also a complex structure taking extremely corrosion of the metal at rate of 0.8 ± 1 loads from a hoist. It guarantees safe and mm/year. reliable operation of the hoist for the At the same time it was found out that a entire period of its operation (35-45 rig 1 (see Fig. 1) as the main supporting years). structure, transferring load from the hoist However, the results of a survey [1] (including emergency) to the wellhead via showed that the actual operational life of the rig base of the winding tower, is the the winding tower under high aggressive most exposed to the aggressive impact and without proper repair and environment. maintenance is often reduced by a half Typical defect of the rig parts is corrosion, versus to a standard service life. and it mostly pronounced at the interface 2. Work description with the rig base. The most common According to the OJSC damage of the rig base is a significant ‘Kuzbassgiproshaht’ and OJSC corrosion on the entire surface of its parts ‘Sibgiproshaht’ defining scope and range due to high humidity of the air entering 1 from a shaft, corrosive gases and coal failure-free operation and economic dust. The entire body of the rig under efficiency are crucial, by all means, at coating is also significantly exposed to selection of rational constructive corrosion due to the abundant solutions. condensation in winter time. However, solving the problem of provision of the longevity of structures and reduction of costs for their repair and maintenance is no less important for structures subjected to corrosive wear. Therefore, choosing cross sections and junctions of winding tower, an aspect of their resistance to corrosion as a guarantee of safety and durability must be considered. The department ‘Construction of Underground Structures and Mines" KuzSTU has developed fundamental constructive solution of the steel winding tower (Fig. 2) [2] and made its prototype (Fig. 3). Fig. 1. Scheme of the steel single-cut four-post winding tower 1) rig; 2) rig base; 3) jib; 4) braces Jib of the winding tower 3 provides stability of the structure, and takes effort from hoist, as well as a significant part of the emergency load. The main defects and damage of the jib can be attributed to deformation due to mechanical impact. A large number of jibs promotes accumulation of coal dust, slag and lube in junctions of the jib and braces, and consequently, occurrence of significant corrosion in the stagnant areas. The condition of stairs and fences does not affect the carrying capacity, but defects and damages of these parts affect Fig. 2. Sketch of a multi-purpose winding the safety while winding tower repair and tower for the operation period: maintenance operations. 1) - jib; 2) – central tubular pole; 3), 4) pulley pad; 5) ring brace 6) rig Traditional approaches to the design of winding towers, taking into account their 2 • a railing in the shape of barrel significantly improves the airtightness of the machine, and also reduces the amount of undesired joints compared with traditional fencing panels; • free space inside of the central tubular pole allows you to place a hoist for equipment and head-frame service, what creates more comfortable and safe working environment; • hoist structure device inside the tubular rack 2 can not only improve the service conditions, but also eliminates the Fig. 3. Prototype of a steel multi-purpose need for traditional metal ladders along winding tower for the mining period the jib located in the area of hoist ropes, what is undesirable for safety reasons. The winding tower has pulley pad, Since the mine winding towers including frame jib 1 (see. Fig. 2) of experience various types of dynamic variable cross section, central tubular pole loads (seismic load, dynamic load of 2, pulley pads 3 and 4, ring brace 5 and equipment, wind pulsation, emergency round-shape rig 6, leaned against load), an important factor for their wellhead via curb. calculation is limited by the natural The developed structure of the winding oscillation frequency. tower has advantages versus the The proposed structure (see Fig. 2) is traditional decisions of the 4-poles designed considering the limits by the winding towers of the rig type as follows: natural oscillation frequency, upholding • high tightness of box-like and of which characterizes the dynamic circular sections of pulley device allows equilibrium of the structure. If required, avoiding penetration of coal dust, and the ring brace 5 can be regarded as a hence increases their resistance to damping element by changing its the corrosion; mechanical parameters we can displace • lack of bracings on the jib frame 1 resonance points of the vibrational system facilitates easy access for inspection and to the direction of frequencies (up to 4 protection of elements and components of Hz), which are safe for the working the structure, as well as eliminates the personnel. accumulation of coal dust, slag and lube 3. Conclusion at the nodes of connection; The found technical solution reflects the • frame machine 6 does not transmit essence of the new approach to finding load from hoist on wellhead of the shaft effective design solutions that takes into and has no rig base and braces, therefore, account the requirements of durability the cost for their maintenance is not and safety, along with the requirements of required; reliability and economy. 3 Thus, when designing winding towers operating under difficult conditions, the choice of a rational design itself is an effective preventive measure to improve industrial safety, reliability and optimal physical resource. 4. Reference [1] Lobkov S.V. Defects and damage of rig type winding towers after a normal period of operation / S.V. Lobkov, A. Zapol'skiy // Labour Safety in Industry, 2012. - № 4. - 14-15p. [2] Patent 2120013 C1 (RU), 6E 04 H 12/26. Multifunction device for mining and operation of vertical mine shafts / E.G. Kassikhina, V.V. Pershin. - № 97110900; Claimed 26.06.97; Published 10.10.98., Bull. # 28. 4 Engineering and process design solutions for the vertical shaft completion Qiao Weiguo1,2, Pershin V.V.3, Kassikhina E.G.3, Butrim N.O.4 1.Shandong University of Science & Technology, Qingdao 266510,China;2.Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Qingdao, Shandong 266510, China;3.T.F. Gorbachyov Kuzbass State Technical University, Mining Institute, 650000, Kemerovo, Russia;4.leading specialist, Department of capital construction and investment activities of ООО «UK Mechel-Mining» (LLC “Management Company Mechel-Mining”), 125993 Moscow, Russia Abstract the optimal solution, which includes the The comprehensive approach including study of process parameters, sinking the combination of advanced and new schemes, mechanical means and technical solutions with the use of modern equipment. technology opportunities providing the The analysis of time schedules (Fig. 1) for the construction of vertical shafts shows real possibility to reduce the vertical shaft that at least 23 of the total duration of the construction labour inputs, costs and time. work Tобщ is spent on shaft completion Tобщ, equipment Tарм and reconstruction Keywords: vertical shaft completion, Tпереход before the operation. decrease of transient periods by means of Tпереход = Tдемонтажа прох. копра + Tмонтажа application of efficient equipment and постоянного копра multifunctional steel angle headgears. 1. Introduction Currently the tendency to reject the construction of vertical shafts is dominated in the design of new Kuzbass mines – the preference is given to the slop mining. This tendency is determined by some reasons: - significant construction time of vertical shafts - 50-60% of the total duration of mine construction; Fig. 1. Time consumption in the construction - high cost of construction of vertical of vertical shafts shafts - 25-30% of the total capital Time consumption (Tобщ) in the investment; construction of “Pervomayskaya” mine - lack of qualified staff due to the vertical shaft elimination of the most part of the sinking time specialized mine construction shaft equipment time organizations; sinking headgear dismounting time - lack of engineering base in this field in Russia. permanent headgear mounting time It is obvious that only a comprehensive completion time solution of these tasks will help to select 5 For the small-depth vertical shafts (up to for the construction of an extended part of 300 m) the relative proportion of time the shaft.
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