A variable-diameter fully threaded pile and its construction method

Abstract

The invention discloses a variable diameter all-thread pile and a pile forming method thereof. The variable diameter all-thread pile comprises an upper-part pile core (2), wherein one end of the upper-part pile core is connected to a lower-part pile core; an upper-part thread pile thread (1) is integrally formed on the upper-part pile core, and a lower-part thread pile thread (4) is integrally formed on the lower-part pile core; the upper-part thread pile thread and the upper-part pile core constitute an upper-part pile body; the lower-part pile core and the lower-part thread pile thread constitute a lower-part pile body; the diameter of the lower-part pile body is not less than that of the upper-part pile body. According to the variable diameter all-thread pile and the pile forming method, the pile cores with different diameters are fixed together, outer threads are integrally formed on the pile cores, so that bearing capacity of a cast-in-place pile is improved to the maximum, the pile forming technology simple and quick in pile forming speed; the variable diameter all-thread pile and the pile forming method are less in soil that is pressed out while pressing soil to form the pile, low in cost, energy-saving and environment-friendly, and applicable to popularizing in the field of constructional engineering.

Description

Technical field [0001] The invention relates to a threaded pile, in particular to a variable-diameter full-threaded pile and a pile forming method thereof, belonging to the field of construction engineering. Background technique [0002] Threaded special-shaped piles have been developed for many years abroad. It was developed by the French in 1966. In 1971, American scientists put forward the theory of threaded pile a, which pointed out that when the pile and soil form a screw occlusion, the bearing capacity of the pile can reach 1-5 times that of the traditional pile type friction combination. Therefore, threaded piles have been widely used in construction projects after they were invented. [0003] The patent number 96119602.5 discloses a pile-forming process of cast-in threaded pile. However, in practice, the screw pile is damaged due to insufficient pile strength, and the high-strength bearing capacity of the screw pile cannot be realized. Moreover, the pile bearing capacity...

AI Technical Summary

Problems solved by technology

Although the structure of the upper straight rod and the lower part of the thread can meet and conform to the change law of the additional stress of the pile body, the upper straight rod part has no advantage in improving the bearing capacity compared with the traditional cast-in-place pile

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