Half screw pile and processing method and apparatus therefor

Abstract

The invention relates to a semi-screw concrete pile, its processing method and equipment. The pile comprises two integrated part; the top part is a cylindrical pile base, and bottom part is a screw pipe base. The processing equipment comprises a power head with a drawing device fixed on the bottom part, a controlling device, a drilling rod with a drilling bit, a frame and a slurry transporting pipe. The processing method comprises: punching the pile hole by screw compressing pile machine to the designed depth, extruding concrete by the drilling rod bottom end of the screw compressing pile machine, rotating backward and pulling upward the drilling rod to a suitable height, pulling upward directly without rotating until the top part of the pile is finished. The advantages of the invention lies in that: 1. the pore and pile are formed by mechanical one-step compression without noise and residual earth removing; 2. the construction speed is more than 750 linear meters per machine per day; 3. The screw- cylindrical pile extruded by the pump pressure type drilling rod has no break, no shank reducing and higher bearing ability.

Description

technical field [0001] The present invention relates to construction machinery, specifically a half-screw concrete pile, a processing method thereof and a device for making it. Background technique [0002] Modern multi-storey or high-rise buildings require strict foundation treatment and appropriate load-bearing pile foundations to carry buildings and prevent damage to buildings caused by earthquakes. For the load-bearing pile foundation, according to the pile environment, it can be classified into soil-squeezing piles (including partial soil-squeezing piles) and non-squeezing piles. The excess pore water pressure in the body increases, the uplift of the soil occurs, and the damage to the surrounding environment has been increasingly concerned. In large and medium-sized cities, this method has been strictly controlled. Non-squeezing piles refer to dry and wet construction method piles, and their soil and mud pollution are very serious. At present, there are almost no bette...

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Problems solved by technology

For example, the patent application 02103855.4 clearly and completely describes such a feature. Although the patent application adds a pre-grouting process at the pile tip to solve the problem of virtual soil at the pile tip, it still uses a cylindrical pile body. Still have the above-mentioned problem that can only bear up and down pressure

[0005] Japan has developed a steel fiber prefabricated fully threaded pile, which has changed this stress characteristic. The steel fiber prefabricated fully threaded pile is a fully threaded pile made of steel fiber in advance by using special equipment. The entire pile body is a threaded structure, which is convenient. Combined with the soil layer, the bearing surface of the pile body is expanded, and the bearing capacity of the pile body is greatly improved. However, special equipment is also required to press the pile body into the soil layer during construction. Due to the high cost and the need for special The supporting equipment and construction are inconvenient and cannot be widely used; moreover, for piles with full thread structure, they cannot be applied to piles with concrete, especially pure concrete structures, because in fact, the bearing capacity of piles is inverted. Pyramid-shaped distribution, the uppermost part bears the greatest pressure, and the bottommost part bears the least pressure. If it is made of concrete, the upper thread is very easy to break, and in fact it cannot function as a thread.

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