Arch bridge abutment tunnel type large-angle inclined pile construction method

Abstract

The invention discloses an arch bridge abutment tunnel type large-angle inclined pile construction method comprising the following steps: an inclined pile is divided into an upper step and a lower step which are separately excavated by weak blasting, the top half circle and the straight wall are 2-3m in total and are excavated first as the upper step, and the lower step begins to be excavated after the upper step is excavated 3-5m; inclined pile slag is extracted by a reciprocating circulation slag extractor, pile slag of the upper step is transshipped by the slag extractor to the bottom of the lower step and then conveyed from the bottom of the lower step to the outside of a hole, and the hole is cleaned manually; after excavation of each section of each step is completed, breast wall support is completed in time in a mode of breast wall anchoring and shotcreting support through a mortar rock bolt, a steel mesh, an I-shaped steel arch and sprayed concrete; and holing quality detection is carried out after excavation of the inclined pile is completed, and inclined pile body reinforcing bar and concrete construction is completed after the holing quality meets the design and specification requirements. By adopting the method of the invention, the project progress is accelerated, the construction cycle is shortened, the working efficiency of slag extraction is improved, and the difficulty in breast wall concrete construction is reduced.

Description

technical field [0001] The invention relates to a method for constructing an inclined pile with a large inclination angle and a large cross-section, which is applied in the construction of an expressway arch bridge. Background technique [0002] The 1-120m reinforced concrete box arch of the Bazhou Bridge on the Sansui-Liping Expressway in Guizhou Province has two double-width integral abutments for the whole bridge, and four inclined piles are connected to the lower slope of each abutment; the inclined piles The cross-sectional size is a semicircle with a diameter of 2m at the top + a rectangular arched inclined pile with a diameter of 2m×4m at the bottom. The included angle with the ground is 43°. The net distance between two adjacent inclined piles is 3.5m. [0003] There is no mature construction technology and equipment for large-angle inclined piles in China, and the construction method of manually using a winch + trolley to discharge slag along the pile wall + molded ...

AI Technical Summary

Problems solved by technology

Due to the large section size and large inclination angle of the inclined pile, the entire section is excavated at one time, and temporary construction scaffolding needs to be erected. The excavation, slag removal, and retaining wall support of the inclined pile are difficult, and the safety risk is high.

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