回转型可回收扩大头锚杆  

Retrievable enlarged-end anchor with looped non-sticky steel-string

作　　者：王立明 施鸣升 徐雷云 王亦斌 周建明 

机构地区：[1]苏州市能工基础工程有限责任公司,江苏苏州215011

出　　处：《岩土工程学报》2010年第S2期471-474,共4页Chinese Journal of Geotechnical Engineering

摘　　要：回转型可回收扩大头锚杆,使用特制的合页式承压板,分别将三根U形回转的无黏结钢绞线锁住,然后按照特定的要求绑扎成锚杆杆体。采用高压喷射成孔工艺,成孔完成后,将杆体穿过内径为110～135mm的钢套管,置入地层中的扩大头内。利用钢绞线自身的弹性,将合页式承压板弹开。然后在扩大头孔底注浆,置换出原扩孔混合浆液。在基坑支护完成后,可将钢绞线从锚杆注浆体内拔出,达到回收的目的。该工艺主要解决锚杆出红线的问题。A kind of retrievable enlarged-end anchor with looped string is introduced.After three steel-strings are locked in U-loop by using a certain hinged bearing plate separately,they are assembled into a cable.The enlarged-end hole is constructed by high-pressure jet water or serous-cement technology,then the cable is inserted into the enlarged-end underground hole through a steel-pipe with inside-diameter of 110 ～135 mm.The steel-strings are opened by itself,together with the hinged bearing plate.The water-cement mixture is replaced by grouting with cement.The steel-strings can be retrieved after the foundation-pit is backfilled.This technology can prevent the anchor from overstepping red line.

关 键 词：基坑支护 回转型 可回收 锚杆(索) 高压喷射 扩大头 

分 类 号：TU476[建筑科学—结构工程]