New Technical Solution for Vertical Shaft Equip- ping Using Steel Headframe of Multifunction Pur- pose

The article reviews a novel approach to the design of steel angle headframe for vertical shafts of coal and ore mines on the basis of rational design solutions. Practice of construction of coal and ore mines provides application of various designs for steel angle headframes which are divided into separate large assembly blocks and constructive elements during assembling operations. Design of these blocks and elements, their weight and dimensions effect the chose of the method of assembling on which economic and technological indicators, as well as duration of down-time, depend on during performance of construction operations in shaft. The technical solution on equipment provision for mine vertical shaft using headframe of multifunctional purpose will allow changing the management construction of vertical shaft. The constructive design of the headgear allows application of the effective method of assembly and thus to provide improvement of the technical and economic indexes, and high calendar time rate of the shaft construction due to reduction of duration of works on equipment provision for the shaft and to refurbishment of the shaft in order to carry out horizontal mining.


Introduction
The construction project of the vertical mine shaft consists of the following main stages: provision of equipment for mine surface and sinking of the technological part of the shaft (including shaft collar); provision of equipment for surface for a shaft sinking, including assembling of the sinking headgear; shaft work; shaft walling; refurbishment of the shaft to carrying out horizontal and inclined developments, including dissembling of headgear unit during sinking operations and, construction of the permanent headframe [1 -10].

Materials and methods
The practice of construction of the coal and ore mines provides various designs for the steel angle headframes, both sinking headgear and permanent headframe: 4-post headframe, 4-post headframe with two stay legs, tent headframe and two-post headframe which are divided into separate large assembly blocks and constructive elements during assembly operations [1 -15]. Namely the assembly time of the headframe depends on the design peculiarity of the setup blocks, and, as a consequence, the total time of work stoppage in the shaft.
Method of erection is selected depending on the structural design of the setup blocks and parts of the headframe, their weight and dimensions, that affects the economic and technological data, as well as the duration of idle time during operations in the shaft.
Construction of Underground Structures and Mines' department at KuzSTU developed technical solution regarding furnishing of the vertical shaft with equipment utilizing steel headframe of multifunctional purpose [16,17,18] what will allow to change mining management on some of the hereinabove mentioned stages.

Results and discussion
As the proposed headframe ( fig. 1) due to assembly/disassembly of the replaceable functional blocks combines the functions of both sinking and operation, then such stages as disassembly of gear complex during sinking operations and construction of the permanent headframe will be eliminated from the schedule.  The driving sheave wheels platform (block #3) is put together on the assembly stand in the form of two blocks, each of them is separately moved to the position 'on the ground' on the level ±0.00 m where they are connected to each other ( fig. 4, a). By two cranes using the central tubular post 1 as a guide, the driving sheave wheels platform 3 is erected to the project position ( fig. 4, b).  The permanent sheave wheels platform (block #4) is put together on the assembly stand also as of two blocks, each block is moved and placed on the driving sheave wheels platform 3 by two cranes (fig. 5, a). On the driving sheave wheels platform 3 they perform the final assembly of the permanent sheave wheels platform 4 from the two enlarged blocks and erect  fig. 5, b). The lifting is carried out by two cranes using the central tubular post 1 as a guide.
The assembly of the enlarged block #5 (the driving unloading platform) is performed as per analogy with the assembly of the block #3 (the driving sheave wheels platform) with the subsequent erection of the bunker (block #6). At this stage of assembling of the winch on the level 40.000 m is already possible for the elevator moving inside of the tubular post 1 which can be in turn used for needs of assemblers.
After a long break when mining and walling of the shaft are complete, it is necessary to dissemble the unloading machine and the receiving bunker, part of the driving sheave wheels platform and the mining equipment to assemble the unit (block #7) (see fig. 1). The unit 7 [17] consists of ring elements 8; each element is separately moved and stack on the driving sheave wheels platform 3 for the subsequent assembly by the 'from up to down' method over the shaft collar 9 ( fig. 6). Thus, the driving sheave wheels platform is used again as assembly and installation platform already during transition to the operation mode. The efficiency of the suggested method of assembly of the headframe of multifunctional purpose is provided by: -Reduction of the total time for assembling of the headframe and, in this regard, considerable reduction of shutdown during operations in shaft, considerable reduction of the overall labor costs and the cost of headframe assembly; -Reduction of labor input and cost of installation due to breakdown of the headframe on the assembly blocks of small weight (250 kH -350 kH); -Application of the sheave wheels platforms for assembly and erection; -Use of the central tubular post as a guide what considerably reduces the number of operations on aligning and adjustment of structures during assembling; -Reductions of labor costs on rigging up of the unit which is put together separately from the sheave wheels platform and other constructive elements of the headframe; -Lack of labor costs on arrangement of the rolling track to deliver ring elements of the rig to the place of installation due to their small weight; -Minimizing of works at height. The suggested option of the vertical shaft construction utilizing headframe of multifunctional purpose versus the traditional technical solution [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] allows to reduce labor input of assembly operations in 1.5 times, duration of works in 1.22 times, steel consumption in 1.5 times (table 1).

Conclusion
Equipping of the vertical shaft using headframe of multifunction purpose allows to optimize the arrangement of mining operations in terms of construction of the mine, as the proposed headframe combines the functions of shaft-sinking and operation, which eliminates the cost of assembly / disassembly of the derrick. The constructive design of the headgear allows application of the effective method of assembly and thus to provide improvement of the technical and economic indexes, and high calendar time rate of the shaft construction due to reduction of duration of works on equipment provision for the shaft and to refurbishment of the shaft in order to carry out horizontal mining.