Reverse screw spike pile and construction method thereof

Abstract

The invention discloses a reverse screw spike pile and a construction method thereof. The reverse screw spike pile comprises a pile body which is made of concrete, and the pile body is a full thread pile body or a partial thread pile body. The full thread pile body comprises a first pile core and a first external thread structure. The partial thread pile body comprises a straight rod section pile body part and a thread section pile body part, and the thread section pile body part comprises a second pile core and a second external thread structure. The first external thread structure and the second external thread structure are both provided with reverse threads. When a reinforcement cage is not arranged inside the pile body, the construction method comprises the following construction steps of enabling a drill rod of a pile machine to be located in place, drilling holes and conducting drill lifting and synchronous concrete pouring construction; when the reinforcement cage is arranged inside the pile body, the construction method comprises the following construction steps of enabling the drill rod of the pile machine to be located in place, drilling the holes, lifting a drill, tripping the reinforcement cage and pouring concrete. The reverse screw spike pile is reasonable in design, easy and convenient to construct, good in using effect, suitable for multiple stratum types, and capable of solving the problems that an existing long auger drilling pouring pile is poor in single-pile vertical bearing capacity, limited in application range, fast in construction progress and the like.

Description

technical field [0001] The invention belongs to the technical field of foundation construction, and in particular relates to a reverse screw pile and a construction method thereof. Background technique [0002] The cast-in-situ pile refers to opening a hole directly on the designed pile position, and its cross section is circular. After the hole is formed, a steel cage is added in the hole and concrete is poured. At present, in foundation projects such as construction, water conservancy, and highways, cast-in-place piles with long spiral holes are widely used due to their advantages of high speed, low noise, no need for mud retaining walls, and low construction costs. But there are following defects and deficiencies in the existing common long spiral hole-forming cast-in-place piles: first, the scope of application is limited, and can only be applied in soil layers such as cohesive soil, silt, and filling soil; When the diameter of the pebble layer is large, it is difficult...

AI Technical Summary

Problems solved by technology

But there are following defects and deficiencies in the existing common long spiral hole-forming cast-in-place piles: first, the scope of application is limited, and can only be applied in soil layers such as cohesive soil, silt, and filling soil; When the diameter of the pebble layer is large, it is difficult or impossible to drill; therefore, the adaptability of the existing soil layer is insufficient, and some areas cannot be used; second, the vertical bearing capacity of the single pile is relatively poor: the vertical bearing capacity of the single pile is the value of the pile in the pile. The main index in the application of foundation construction, which determines the weight of the superstructure that the pile can bear; the existing cast-in-situ piles are mainly straight rod piles, and the outer surface of the pile body after pile formation is a smooth circumferential surface, and its vertical bearing capacity is The sum of pile side resistance and pile tip resistance; however, after the existing long spiral hole-forming cast-in-situ pile is drilled, the soil at the pile tip is disturbed, which easily forms void soil at the bottom of the hole, reduces the pile tip resistance, and thus affects the bearing capacity of the single pile; 3. The construction progress is slow. The drilled holes formed by long helical drilling are round holes. The threads on the threaded drill rod are mostly forward threads (also called right-handed threads, which refer to threads screwed in clockwise), and the holes are formed During the process, the drill pipes are unearthed continuously, the amount of unearthed is large, the workload of unearthed cleaning and transportation is heavy, and the amount of concrete used is large

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