Combined pile of pre-stressed wedge-shaped pipe pile and pre-stressed pipe pile

Abstract

The invention relates to combined pile of a pre-stressed wedge-shaped pipe pile and a pre-stressed pipe pile, which belongs to the technical field of building pile foundation and is characterized in that according to the soil layer properties as well as the pipe pile design and construction requirements, the combined form of the pre-stressed pipe pile and the pre-stressed wedge-shaped pipe pile is designed, so that the pile foundation achieves the best technical and economic effect; all pipe sections are connected through a threaded mechanical quick connection method; and under general circumstances, the lower part adopts pre-stressed wedge-shaped pipe pile pipe sections, and the upper part adopts the combination of pre-stressed pipe pile pipe sections. The combined pile has the advantages and the benefits that a pre-stressed conical pipe body can improve the positive friction force on the pile side, and simultaneously can effectively reduce the impact of the negative friction force to the pile body, and the prefabricated pre-stressed conical pipe pile body is easy to ensure the strength and the construction compression efficiency of the pile body; and the pre-stressed pipe pile can effectively improve the strength and the pile body and the resistance of the pile end. The pile model can improve the unit material strength utilization rate, improve the positive friction force on the pile side and the resistance on the pile end, and simultaneously can effectively reduce the impact of the negative friction force on the pile side on the pile body, so as to improve the overall bearing capability of a foundation pile.

Description

technical field [0001] The invention belongs to the technical field of building pile foundations, in particular to a prestressed wedge-shaped pipe pile and a prestressed pipe pile combined pile. Background technique [0002] The vertical bearing capacity of pile foundation is composed of pile tip resistance and pile side friction resistance. Prestressed concrete pipe piles have the advantages of high pile body strength (C60-C80), strong pile sinking capacity, high single pile bearing capacity, short construction period, and low cost. Before the present invention, prestressed concrete pipe piles, such as Chinese patents (ZL 200610010620.9 and ZL 200610049916.1), were a hollow cylinder slender concrete prefabricated component made by pretensioning prestressing process and centrifugal forming method, mainly composed of cylinder The pile type has the advantages of high pile body strength, strong pile sinking capacity, high single pile bearing capacity, short construction period...

AI Technical Summary

Problems solved by technology

Prestressed wedge-shaped pipe piles, such as Chinese patent (ZL200420063381.x,), etc., use the different diameters of the upper and lower ends of the same circle to form the inclined surface of the pile side, and invert the inclined surface of the wedge to convert part of the vertical downward force into a horizontal force. The bearing capacity of the soil on the side of the pile can be improved, thereby improving the frictional resistance of the pile side; compared with the equal-diameter prestressed pipe pile, it has the advantages of better soil penetration and higher pile unit bearing capacity; however, due to the Due to the influence of pile diameter and inclination angle, the length of prestressed wedge pipe piles is generally short, which limits its popularization and application

Wedge-shaped concrete-filled steel pipe piles, such as U.S. Patent (US 7073980 B2), etc., firstly drive the wedge-shaped steel pipe pile with the closed lower end into the soil, then drive into the ordinary steel pipe pile connected with the wedge-shaped steel pipe pile, and finally drive the steel pipe pile into the The mid-casting concrete forms a wedge-shaped concrete-filled steel pipe composite pile; this pile type treatment method has a high bearing capacity of the pile body; but the treatment cost is relatively expensive

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