Introduction (Motivation)
Develop devices relates to drilling in soft soil with a diameter in the range 800-1500 mm piles for various purposes.
The relevance of the work
Decline in production in recent years, touched and drilling companies in GCC "Spetsshahtoburenie". This led to the fact that apart from its main production shafts and large-hole drilling control and began to engage non-traditional kind of work - drilling shallow wells under a pile of different purposes. Feature of the drill is that in one area of drilling is necessary to construct wells of different diameters ranging from 800 to 1500 mm. This leads to the fact that a drilling rig, such as M – 150, should have a list of drilling tool for drilling diameters. This results in inefficient use of drilling tools, high transport costs to the drilling site. In this versatile tool that would allow to quickly change the diameter of drilling without changing to a new no. Therefore the development of the bucket auger, which would allow drilling wells under the pile for various purposes in the rocks of I – IV categories is a challenge.
Research objectives and tasks
The research goal is to developdesign combined accumulating bucket auger drill that will allow a whole range of diameters in the range 800 – 1500mm.
Research tasks:
1. Perform analysis of existing designs bucket drills and technologies that are used for drilling piles for various purposes.
2. Choose the operating principle and layout of the universal bucket auger.
3.Obosnovat rational structural design parameters bucket auger.
4. Perform development work.
5. Develop a technology training and operation of the universal bucket auger.
The idea of work
Improving and expanding technological capabilities of the bucket auger due to the possibility of changing the diameter of drilling in the range 800 – 1500mm.
The object of research and subject of research
The object of research – technical tools and technology for drilling piles for various purposes.
The subject of research – design and parameters of the bucket auger to ensure the expansion diameter drilling a drilling tool.
Possible outcomes
1. Justification of the principle of combined accumulating bucket auger for drilling holes in the ground category I – IV in diameter in the range 800 – 1500mm.
2. The design of advanced composite accumulating bucket auger (at the level of invention) and technology of its application.
2. Survey of research anddevelopments
2.1.Combined accumulating auger drill KASHB – 1
Combined accumulating auger drill KASHB – 1. Drill (pic.1) consists of two cylinders, the outer 9 and the inner 10, made of pipes with wall thickness of 10 and 16 mm.
The bottom of the drill has a shape of a cone, concave inward, and connecting the inner and outer cylinders. In the cone angle of 90 ° made four slots in which the blades move the bits 3. All four knives have grooves 7, in which they are moved to fixed in the housing bore fingers 6. For the nomination of knives on the maximum diameter drilling in the housing bore installed additional rollers 5 with the sleeves. The mass drill regulated mounted in the bottom of the weighting, which may be metal or concrete. In the inner cylinder has odnozahodny auger 4 with two cutters and jumper 1. The screw is designed to destroy the slaughter and transportation of rocks through the windows 11 in the accumulator 13. Worm shaft is made from the casing assembly in the drill pipe. With screw thread attached to the shaft, rotating at work in the bush 15. On the shaft of the screw is fixed jaw half-coupling 16, second half-coupling fastened to the housing bore. The design of claw coupling allows for full engagement not just to rotate the drill, but to lift them to the surface, ie, it is possible to adjust the load on the face during drilling. The inner cylinder is attached to the outer ribs 14 [4].
Unloading the battery through a tube and the window 8. Mounting the window 12 in outer cylinder are used for mounting screw and control the load level the battery. Drilling is carried out on clay or polymer clay solution with speed 4 - 6 revolutions per minute, with an effort to face 20 - 30 kN (enough to hold the auger blade in the open position and the destruction of an array of clay rocks). Due to the fact that the storm are moving blades with incisors, bonding can be carried out after drilling or on reaching the design depth of the estuary [8].
3. Alleged novelty
To extend the technological capabilities KSHB - 1 of the storm is proposed to reduce the diameter inner cylinder with 820 mm to 300 mm and 2150 mm from the outer 750 mm. Design feature is that in the case of the cone are made grooves in which two opposing knife at their appointment have a different flight that provides overlapping slaughter of between 800 mm to 1500 mm. In the bottom of the drill required mounting, which provides not only moving, but also secure attachment blades 3 in the radial direction (pic.2).
To preserve the internal volume of the battery is proposed to increase the height of the rock drill to 5.8 m. So when the diameter of the borehole drilling is necessary to loosen the surface of blades 3, to adjust their departure time with respect to the axis of the drill and then fix them. At the same time opposing blades for even distribution of effort relative to the bottom and the uniformity of its floors are promoted to the same value.
Conclusions
Having considered and reviewed the problems encountered in drilling piles for various purposes, one can conclude that the proposed device is much more efficient and economical use early. Since there is no need for drilling to change the diameter of the hole to carry the appropriate drilling tools. This device is designed to change the diameter of the hole on-site drilling without delivery of the drilling tool and reduces the cost of manufacturing and transportation.
At the moment, Master's work is in progress. After the December 2010 full text paper can be obtained from the author or supervisor.
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