Improved structure of spiral anger and profiled semi screw pole body

Abstract

This invention is a kind of auger stem modified structure and the deformed half screw pole body , the auger stem modified structure includes the boring bar, the drill bit, the boring bar , the boring bar has a part to be helix structure at least, the helix part of the boring bar is reverse echelon structure ,it is that it has the outside diameter structure being expanded from downward to upward gradually, it is easy for the helix part leading the whole boring bar drill downward, this structure designs the auger stem structure expanded gradually, it may deter the impact of axial reaction forceto the drill when drilling, diminishing the resisting force when drilling, lightening its work load , improving the work effect of the boring bar. This pole body structure has multilevel structure, the pole body is composed of more than one discontinuous part which have different diameter, the pole body is convenient to enter the soil layer in depth, it can be set to be suitable depth, for example, the bottom of the pole body can arrive at more than 20 meters below the ground, it has forceful supporting effect to the building that it props up.

Description

technical field [0001] The invention relates to a drill pipe for construction and the special-shaped semi-screw pile body formed therein. To be precise, it is an improved structure of a spiral drill pipe. , with small workload and high efficiency, it can form a special-shaped semi-screw pile body with strong supporting effect. Background technique [0002] In building construction, in the process of excavating the foundation, the most important step is to bury piles that can be integrated with the building being constructed. The piles are the key to the load-bearing and stability of the building. The column construction of the building is generally done by piling first. , The method of pouring concrete again, but this method is often cumbersome, and the construction period is long, time-consuming and laborious. Whether it is prefabricated or cast-in-place concrete end-bearing friction piles at home and abroad, the pile ends are basically placed on the soil layer with better...

AI Technical Summary

Problems solved by technology

[0005] 1. The drill pipe has to bear the reverse force of the soil layer in the process of drilling the soil. This huge axial reaction force often reaches 20-30 tons, which is a great damage to the drill pipe itself. Long-term use will inevitably affect the performance of the drill pipe. life

[0006] 2. When the drill pipe is pulled out and poured with concrete, a large amount of concrete is often accumulated at the outlet of the drill pipe, which is easy to block the outlet and cause the jamming phenomenon

[0007] 3. Drill pipes often have to be drilled to more than 20 meters underground, requiring very long drill pipes, which makes the production of drill pipes more difficult and costly

[0008] 4. For large-diameter drill pipes, the above-mentioned structure often has considerable resistance to running in. The resistance is generally concentrated directly on the helical part of the auger drill pipe. It is very difficult to reach a drilling depth of less than 20 meters, and for weathered rocks The drill pipes mentioned above often cannot meet the requirements of running in the drill

[0010] Moreover, the pile body thus formed has a cylindrical end-bearing pile at the top and a friction pile with a helical structure at the bottom. However, the pile body often cannot have a deep depth due to the drilling and pouring restrictions of the drill pipe. The soil layer can be used. For the soil layer with a certain hardness, the special-shaped half-screw pile body cannot be realized, especially in the case of complex geological structures in the southern region, the special-shaped half-screw pile body cannot be adapted and cannot be combined with weathered rock. , pebbles and other geological conditions, it is difficult to combine with the soil layer according to the characteristics of the soil layer

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