Construction method of erosion-preventing large-diameter bored pile

Abstract

The invention relates to a construction method of an erosion-preventing large-diameter bored pile. The method is characterized in that in the construction method, a movable large-rigidity guide rack is used to control steel casing perpendicularity, an erosion-preventing protecting layer comprises a lower-layer cement grouting body, a middle-layer film bag sand-filling body and upper-layer stone riprap; the movable large-rigidity guide rack comprises a section steel truss, a pushing adjusting device, a moving guide rail, a movable pulley, a traction device and the like;a sectional machining and a field butt joint is adopted for the sinking process, and the sinking process uses the large-rigidity guide rack to position the steel casing, control the perpendicularity of the steel casing and correct the steel casing; high-pressure grouting is performed in certain depth range of a riverbed through a reserved grouting pipe to form a cement grouting body protecting layer after the bored pile is constructed, and a riprap erosion-preventing layer is constructed after a whole pile group is constructed. By the method, the erosion-preventing large-diameter bored pile can be fast constructed in river sections with rapid flows and severe erosion effects, high construction quality is achieved, and good technological and economic benefits are achieved.

Description

technical field [0001] The invention relates to an anti-scouring large-diameter bored pile in strong tidal and rapid water and a construction method, which belongs to the field of pile foundation construction of bridge engineering, and is suitable for the construction of large-diameter bored piles in water, especially for complex hydrological conditions and riverbeds. Construction of large-diameter and super-long cast-in-situ piles in wide and shallow river sections with strong tides, strong currents, and severe erosion and silting. Background technique [0002] It is a technical difficulty in bridge construction to carry out pile foundation construction in river sections with complex hydrological conditions, wide and shallow riverbeds, strong tides, and severe erosion and siltation. The key to pile foundation construction is whether the steel casing can be placed smoothly. How to quickly, safely and accurately sink the steel casing of the pile foundation is a difficult poin...

AI Technical Summary

Problems solved by technology

The main defects of these methods are: (1) the guide frame cannot be moved, and a guide frame is often required for a cast-in-place pile, which brings a substantial increase in engineering cost; (2) the anti-scouring protective layer is installed after the cast-in-situ pile is constructed However, the construction period of the cast-in-place pile group is long, during which the riverbed may have been severely scoured, and the steel casing may be tilted, which will affect the subsequent rotary drilling of the cast-in-place pile

[0004] To sum up, although the existing construction of anti-scour large-diameter bored piles has achieved certain results in strong tidal torrent water, there are still some areas for improvement.

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