High-speed railway bridge large-diameter prefabricated tubular pile long spiral hole lead construction method

Abstract

The invention belongs to the field of high-speed railway bridges and in particular relates to a high-speed railway bridge large-diameter prefabricated tubular pile long spiral hole lead construction method which comprises the following steps: straightening a first section of a prefabricated tubular pile, and beating into the ground; welding a second section of the prefabricated tubular pile with the first section of the prefabricated tubular pile; inserting the screw rod of a long screw rod drilling machine into a drilling hole in the tubular pipe from the top of the second section of the prefabricated tubular pile, leading the hole till a depth required by design, straightening the prefabricated tubular pile, and beating into the ground; welding a third section of the prefabricated tubular pile with the second section of the prefabricated tubular pile, straightening the prefabricated tubular pile, and beating into the ground; repeating the steps in later prefabricated tubular pile construction till a last section of the prefabricated tubular pile is beaten into the ground till a design depth, thereby completing construction of all prefabricated tubular piles. By adopting the construction method, the long screw rod drilling machine is adopted to lead holes and expand soil, the resistance of a prestress reinforced concrete prefabricated tubular pile passing through a sand layeris reduced, the prestress reinforced concrete prefabricated tubular pile can penetrate through the sand layer smoothly, a hole is not broken at a design depth, and construction quality can be ensured.

Description

Technical field [0001] The invention relates to a method for constructing a long spiral lead hole of a large-diameter prefabricated pipe pile for a high-speed railway bridge, which belongs to the field of high-speed railway bridges. Background technique [0002] Conventional foundation reinforcement method-pipe pile reinforcement is mainly used for housing construction, with a diameter of less than 0.6m. The conventional pipe pile construction is to directly drive the pipe pile to the design position. In the high-speed railway construction technology, there is no domestic precedent for the construction of pre-stressed reinforced concrete precast pipe piles with a diameter of 1.0m. In North China, the geology is dominated by silt, silty clay, clay, silt, and fine sand. Under normal circumstances, only by hammering, pipe piles cannot pass through the sand layer in the soil smoothly, and the pile head is easily driven. Explosion, unable to hit the design depth. Summary of the inve...

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Problems solved by technology

In North China, the geology is dominated by silt, silty clay, clay, silt, and fine sand. Usually, pipe piles cannot pass through the sand layer in the soil smoothly only by the hammering method, and the pile head is easily driven into the ground. Explosion, unable to hit the designed depth

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