Construction Technologies of Three Kinds of Hammer Pipe Piles with Pilot Holes in a Hard Rock Stratum Site in Zhuhai City
LIN Huiting
TANG Jun
TANG Jianbin
ZHOU Wenchao
HE Yujun
Abstract：In view of the short construction period required by the construction unit of Zhuhai industrial project,PHC500 pipe pile foundation is given priority.However,for the site with isolated stone or silt stratum directly to the strongly weathered granite or medium weathered granite site,the damage ratio of hammered pipe pile is high,and the construction of pilot holes is required.This paper compared the cost,efficiency,and technical characteris-tics of three methods:long auger drill pilot holes,rotary excavator pilot holes,and drill hammer pilot holes.The long auger drill method struggles to penetrate rock,and the rotary excavator method has low construction efficiency in hard rock strata.Although the drill hammer method has a relatively high unit price,it offers superior efficiency in hard rock strata due to the impact of air-driven hammers,resulting in significant overall benefits.
Keywords：Hard rock stratumPilot holeDrill hammer pilot hole methodCompressive capacity performance
Publication Date：2025-06-30
Online Publishing Date：2025-08-25(First online date of this platform, not the publication date of the document)
Pages：9( 146-154 )