Research on Construction Technology of Super-large Diameter Cast-in-place Piles in Coastal Deep Rock-filling Area
There are often high-content,large-particle,deep-filled stone layers in the reclamation area,which brings technical problems to the construction of long and large-diameter bored piles.The filling stone layer of a project has a thickness of 17.3m,and the pile was constructed with a pile diameter of 1.5m and a maximum pile length of 88m.The"impact drilling+rotary drilling"relay hole-forming technology and the anti-sticking device of the rotary drilling rig in the rock fill layer were adopted after research.The key raw material mix ratio of mud blending and the optimal quality mix ratio of CMC wall protection slurry were determined through an orthogonal test.By optimizing the mineral admixtures,the optimal mix ratio of concrete is determined to improve its durability,workability and plasticity.
pilesland reclamation arearock fillhole formationorthogonal testmixing ratio
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