Construction method for recyclable anchor rod

Patent metadata

Field	Value
Publication number	US-11555285-B2
Application number	US-202117495683-A
Country	US
Kind code	B2
Filing date	Oct 6, 2021
Priority date	Feb 22, 2021
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

A construction method for a recyclable anchor rod. The recyclable anchor rod includes a reinforcing steel bar body and an unlocking device. The unlocking device includes a housing, a fixed panel, a top limiter, lifting screw limiters, a lifting screw, transmission gears, gear clamping arms, a thread limiter, and a pressure bearing plate. The construction method includes: 1, positioning; 2, drilling; 3, anchoring; 4, performing primary grouting; 5, performing secondary grouting; 6, tensioning and locking; and 7, recycling the reinforcing steel bar body. Shock-absorbing pressure-bearing devices are arranged between the lower end of the housing and the pressure bearing plate. The present disclosure effectively solves the problems that a conventional anchor rod hinders the construction of an adjacent underground structure and pollutes underground environment, and the problems that the existing recyclable anchor rod unlocking device is unstable, does not have earthquake resistance, and cannot realize 100% recovery of rod bodies.

First claim

What is claimed is:

1. 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.

2. The construction method for a recyclable anchor rod according to claim 1 , wherein shock-absorbing pressure-bearing devices are arranged between the lower end of the housing and the pressure bearing plate; the housing comprises an inner housing and an outer housing that are nested and connected in a sliding manner; each shock-absorbing pressure-bearing device comprises an outer mold, a moving plate, and a shock absorber; the lower surface of the bottom of the outer mold is fixedly connected to the pressure bearing plate; the top of the outer mold is fixedly connected to the outer housing in a sealed manner; the upper surface of the top of the moving plate is fixedly connected to the lower end of the inner housing; the outer side wall of the moving plate is connected to the inner side wall of the outer mold in a sliding manner; the shock absorber comprises a top sliding block and a sleeve base; the upper surface of the top sliding block is fixedly connected to the lower surface of the top of the moving plate; the lower surface of the bottom of the sleeve base is fixedly connected to the upper surface of the bottom of the outer mold; the top sliding block comprises a top sliding block outer ring body and a top sliding block central body; the top sliding block central body comprises a variable diameter head and a constant diameter shaft; the diameter of the variable diameter head is greater than that of the constant diameter shaft; the outer side wall of the lower part of the top sliding block outer ring body is connected to the inner side wall of the sleeve base in a sliding manner; a limiting clamping seat is located below the top sliding block, and the outer side wall of the limiting clamping seat is connected to the inner side wall of the lower part of the top sliding block outer ring body; a hole is formed in the top of the limiting clamping seat; the variable diameter head is connected to the inner side wall of the limiting clamping seat in a sliding manner through the hole; and the limiting clamping seat limits the reducing head; a support seat is arranged on the upper surface of the bottom of the limiting clamping seat; the lower surface of the bottom of the limiting clamping seat is fixedly connected to the upper surface of the bottom of the sleeve base; a spring surrounds the outer side of the limiting clamping seat; the distance between the spring and the top sliding block outer ring body is greater than the distance between the lower surface of the top of the limiting clamping seat and the top of the variable diameter head; an annular rubber block is arranged on the outer side of the spring; the height of the annular rubber block is less than that of the spring; the height of the spring is less than that of the limiting clamping seat; the annular rubber block is nested inside the sleeve base, and the outer side wall of the annular rubber block is connected to the inner side wall of the sleeve base in a sliding manner; and step three further comprises combining the shock-absorbing pressure-bearing devices.

3. The construction method for a recyclable anchor rod according to claim 2 wherein the shock-absorbing pressure-bearing devices are symmetrically distributed on the periphery of the reinforcing steel bar body.

4. The construction method for a recyclable anchor rod according to claim 2 , wherein the support seat is arranged below the variable diameter head.

5. The construction method for a recyclable anchor rod according to claim 2 , wherein in step three, the shock-absor

Assignees

• Univ Dalian Tech

Inventors

• Jia Jinqing
• Zhang Lihua
• Gao Xing
• Tu Bingxiong

Classifications

• E02D5/765 Primary

  removable · CPC title

• E02D17/04

  Bordering {surfacing} or stiffening the sides of foundation pits · CPC title

• E02D5/74 Primary

  Means for anchoring structural elements or bulkheads (anchoring piles E02D5/54 {; anchored foundations E02D27/50}) · CPC title

• E02D5/801

  driven by screwing · CPC title

• E04H9/02

  withstanding earthquake or sinking of ground (foundations E02D27/34) · CPC title