Construction method for recyclable anchor rod

A construction method for a recyclable anchor rod, wherein the recyclable anchor rod comprises a reinforcing steel bar body, an unlocking device, a base plate, and an anchor head;

• the tail end of the reinforcing steel bar body is an unlocking end;
• the unlocking end comprises a first section, a first diameter reducing section, a second section, a threaded section, and a second diameter reducing section from bottom to top;
• the diameter of the second diameter reducing section is less than or equal to the thread inner diameter of the threaded section;
• the cross section of the top of the second diameter reducing section is in a radial sawtooth shape;
• the unlocking device includes a housing, a top limiter located at the top end of the housing, and a fixed panel fixedly connected to the housing;
• annular lifting screw limiters are arranged on the fixed panel;
• the lifting screw penetrates through the lifting screw limiters;
• the internal threads of the lifting screw limiters are engaged with the external threads of the lifting screw;
• the cross section of the bottom of the lifting screw is in a radial sawtooth shape and is matched with the cross section of the top of the second reducing section;
• transmission gears are symmetrically fixed to the left side and the right side of the fixed panel through a transmission gear shaft;
• gear clamping arms are fixed to the left end and the right end of the fixed panel through a gear clamping arm shaft;
• the transmission gears are in engaged connection with the external threads of the lifting screw;
• gears at the upper ends of the gear clamping arms are in engaged connection with the transmission gears;
• open-close type pressure bearing semi-circular rings are arranged at the lower ends of the gear clamping arms;
• the lifting screw limiters fixedly connected to the housing are arranged below the fixed panel;
• the threaded section penetrates through the lifting screw limiters;
• the external threads of the threaded section are in engaged connection with the internal threads of the lifting screw limiters;
• a pressure bearing plate is arranged at the lower end of the housing;
• the construction method comprises the following steps:
• step one, determining a mounting position of an anchor rod;
• step two, performing drilling treatment;
• step three, combining and mounting the anchor rod:
• combining the unlocking end and the unlocking device;
• bonding the two open-close type pressure bearing semi-circular rings into an open-close type pressure bearing ring;
• making the first diameter reducing section penetrate through the open-close type pressure bearing ring without friction therebetween;
• tensioning the first diameter reducing section through the gear clamping arms, wherein dual locking of the reinforcing steel bar body is realized by the open-close type pressure bearing ring and the lifting screw limiters;
• placing the anchor rod;
• step four, performing primary grouting;
• step five, performing secondary splitting grouting;
• step six, tensioning and locking the anchor rod;
• and
• step seven, recycling the reinforcing steel bar body after the anchor rod completes supporting and protecting tasks:
• removing the base plate and anchor rod;
• rotating the reinforcing steel bar body clockwise;
• making the reinforcing steel bar body rise;
• making the first diameter reducing section move upwards in the open-close type pressure bearing ring, wherein the sawteeth of the cross section of the top of the second diameter reducing section are engaged with the sawteeth of the cross section of the bottom of the lifting screw;
• meanwhile, driving the lifting screw to rise rotatably, wherein the lifting screw rises rotatably to drive the transmission gears to rotate, so as to drive the gear clamping arms to unfold;
• opening the open-close type pressure bearing ring, relieving the locking of the first diameter reducing section of the reinforcing steel bar body to complete a first unlocking program;
• then continuing rotating the reinforcing steel bar body clockwise;
• when the lifting screw touches the top limiter, rotating the reinforcing steel bar body reversely, wherein a second unlocking program is completed when the threaded section of the reinforcing steel bar body is rotated out of the thread limiter, and then the reinforcing steel bar body can be pulled out.