澳门美高梅金殿工程大口径钻孔扩底灌注桩施工技术

Construction Technique of Large Diameter Under-reamed Bored Cast-in-place Pile in Macao Meigaomei Golden Palace

摘要:

澳门美高梅金殿工程主楼基础为38根钻孔扩底灌注桩，桩孔直径为3m扩底到4．2-4．5m，场地狭窄，且是在微风化花岗岩中扩底。根据工程的具体情况，采用贝诺特工法、反循环四翼刮刀钻头钻进、滚刀钻头钻进等组合钻进工艺，同时采用在港澳地区限制严格的泥浆护壁钻进。为港澳地区用泥浆钻桩孔作出了典范，且取得了良好的经济效益。

Abstract:

The foundation of the main building of Macao Meigaomei Gold Palace consists of 38 under-reamed bored cast-inplace piles, the diameter of pile hole was enlarged from 3m to 4.2 - 4. 5m in narrow light weathered granite construction field. So Benoto Method, reverse circulation drilling with quadruple-wing drag bits, drilling with roller-type cutting head and combined drilling technology was adopted as well as wall protection with mud, which is strictly districted in Hongkong and Macao. The project became an example for pile hole drilling with mud in Hongkong and Macao, and good economic result was received.