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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。
Swing type Recyclable expansion head bolt, using a special hinge plate, respectively, three U-turn non-bonded strand locked, and then tied to the specific requirements of the bolt rod body. Using high-pressure jet into the hole process, into the hole is completed, the rod body through the inner diameter of 110 ~ 135mm steel casing, into the formation of the enlarged head. The use of strand flexibility, the hinge type pressure plate bounced. Then enlarge the head hole bottom grouting, replace the original expansion hole mixed slurry. After the foundation pit support is completed, the strand can be pulled out of the grouting body by the anchor rod to achieve the purpose of recovery. The process is mainly to solve the problem of red anchor.