Construction Treatment Method of Cast-in-situ Triangular Composite Foundation Pile

Abstract

The invention discloses a construction method for rapidly finishing a cast-in-situ concrete triangular large composite foundation pile on a soft soil foundation and a special hole former therefor. The special hole former comprises a medium-high frequency vibratory hammer, a special fixture device, a circular outer steel pile casing, a triangular inner steel pile casing, a triangular reinforced concrete seal pile toe, a triangular steel valve pile toe and a steel hinge joint. According to the scheme of the invention, the composite foundation pile treated on the soft soil foundation can improve the single-pile bearing capacity and improve the whole sideslip displacement resistance of the composite foundation. Due to the implementation of the scheme, the construction cost can be reduced by over 20%, the volume of excavated soil in construction can be reduced by 50%, pollution caused by secondary dredging and transportation is avoided, and the construction method can be adapted to the construction on different soft and weak soil layers and complex fields.

Description

technical field [0001] The invention relates to a construction treatment method suitable for quickly completing cast-in-place concrete triangular large-scale composite foundation piles on soft soil foundations. This scheme is suitable for the construction of composite foundation piles of various deep soft soils and backfill soils, and can be widely used in seawalls Composite pile foundation, soft foundation treatment of port and wharf dredging land reclamation and other weak foundation treatment in civil construction. Background technique [0002] At present, in the pile foundation construction of various ports, docks, water conservancy, airports, railways and buildings with deep soft soil and backfill soil, most of them still use the traditional construction technology, that is, first drive a large-diameter single steel casing into the Or press into the soil, and then take the soil by punching, digging or auger drilling. This construction method needs to discharge a large a...

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Problems solved by technology

[0002] At present, in the pile foundation construction of various ports, docks, water conservancy, airports, railways and buildings with deep soft soil and backfill soil, most of them still use the traditional construction technology, that is, first drive a large-diameter single steel casing into the Or press into the soil, and then take the soil by punching, digging or auger drilling. This construction method needs to discharge a large amount of soil during the hole forming process. During the silt transportation, the surrounding environment was polluted again. At the same time, a large amount of concrete was needed when pouring the pile body, which not only took time and labor, but also increased the project cost.

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