摘要
Abstract
To address the production and transportation limitations,the difficulties of ultra-deep burial(38m),and the construction efficiency issues of large-diameter ultra-deep-buried prestressed concrete pipe piles(ΦPRC-I-800C110)in excavation support,this study proposes an integrated optimization solution.By combining the manufacturer's production capacity,equipment,and transportation capabilities,the pipe piles are innovatively designed as three-section prefabricated structures with a 1m offset at the joints,which enhances production and assembly efficiency,shortens the construction period,and reduces pollution.Additionally,open-type oconal pile tip is proposed to replace the traditional sealed cross pile tip,significantly increasing the pile driving depth by 6.84%.A Φ650mm rotary drilling pilot hole with a depth of 30m to 42m is also adopted to collaboratively reduce the resistance in ultra-deep strata,enabling the pile driver to stabilize at the designed range of 4000kN to 8000kN and reach a depth of 38m.The joints are reinforced with prefabricated arc-shaped steel plates of the same material and coated with polyurea for corrosion protection.Ultimately,a set of efficient and standardized construction process flow is formed through experiments,providing important technical references for similar projects.关键词
预应力管桩/支护/施工技术Key words
prestressed pipe pile/support/construction technique分类
建筑与水利
