CN-116378025-B - Recyclable anchor rod and recycling method thereof

CN116378025BCN 116378025 BCN116378025 BCN 116378025BCN-116378025-B

Abstract

The invention relates to a recoverable anchor rod and a recovering method thereof, wherein the recoverable anchor rod comprises an anchor rod, the anchor rod comprises a free-section anchor rod and an anchor-section anchor rod which are mutually connected through a recovering device, the recovering device comprises a shell, an annular hole for connecting and allowing the free-section anchor rod to move is formed in the top of the shell, a threaded hole for connecting the anchor-section anchor rod is formed in the bottom of the shell, annular teeth and a bearing table which is matched with the shape of the annular teeth are arranged in the recovering device, the bearing table is meshed with the annular teeth along with the stretching displacement of the anchor rod, the free-section anchor rod is driven to rotate along a first direction when the anchor rod is in a stretching state, the free-section anchor rod is driven to rotate and drive the recovering device to generate a first torque along the first direction, and the anchor-section anchor rod generates a second torque along a second direction opposite to the first torque, so that the free-section anchor rod is separated from the anchor-section anchor rod under the action of the first torque and the second torque which are opposite to each other.

Inventors

ZHENG MINGMING
YAN SHICHUN
ZHU CHENGTAO
CHEN ZHENLIN
LIU XILONG
XIA MIN
WANG JIAXIN
WANG KAI
ZHOU KERUI

Assignees

成都理工大学

Dates

Publication Date: 20260512
Application Date: 20230404
Priority Date: 20220407

Claims (8)

1. A recoverable anchor rod, which comprises a base and a plurality of bolts, characterized by comprising the following steps: the anchor rod (1) comprises a free section anchor rod (101) and an anchor section anchor rod (102); The recovery device (2) comprises a cylindrical shell, the upper part of the cylindrical shell is provided with an annular hole which is used for lowering and connecting a free section anchor rod (101), when the anchor rod (1) is used for anchoring, the free section anchor rod (101) is in threaded connection with a screw rod (14), the anchor section anchor rod (102) is detachably connected with the screw rod (14), The recovery device (2) is provided with annular teeth (11) and a bearing table (12) which is movably meshed with the annular teeth (11) along with the stretching of the anchor rod (1), When the anchor rod (1) is in tension, the free section anchor rod (101) is driven to rotate along a first direction and enable the recovery device (2) to generate first torque along the first direction, the anchoring section anchor rod (102) generates second torque based on the rotation of the free section anchor rod (101) so as to allow the free section anchor rod (101) to be separated from the anchoring section anchor rod (102) under the action of the first torque and the second torque which are opposite to each other, a threaded hole (15) allowing the anchoring section anchor rod (102) to be detachably connected with the recovery device (2) is formed in the bottom of the recovery device (2), at least one eccentric oil pipe channel (13) is formed in the surface of a screw rod (14) meshed with the threaded hole (15) of the anchoring section anchor rod (102), The recovery device (2) is connected with an oil pipe (19), the oil pipe (19) axially extends along the free section anchor rod (101) and penetrates through the bearing platform (12) to be in butt joint through a quick connector male plug (18 a) and a quick connector female plug (18 b) so as to extend to a micro gap (21) of the screw rod (14) and the threaded hole (15), the oil pipe (19) is allowed to be connected to the oil pipe channel (13) through an inner oil pipe channel (20), and the quick connector male plug (18 a) is matched with the bearing platform (12) through a magnetic attraction piece (23).
2. A recoverable anchor according to claim 1, wherein hydraulic oil is injected into the micro-gap (21) of the screw (14) and threaded bore (15) by means of an oil pipe (19) before or while the free-section anchor (101) is in tension and is driven to rotate in a first direction to allow the hydraulic oil to provide a hydrostatic torque assisting the screw (14) to loosen from the threaded bore (15).
3. The recoverable anchor rod according to claim 1, further comprising a monitoring unit comprising a strain sensor (9) and a controller (5) in signal connection with each other, wherein, -A strain sensor (9) for acquiring strain data of the anchor rod (1) related in time to stress; and the controller (5) is used for determining the anchoring state of the anchor rod (1) according to the strain data from the strain sensor (9).
4. A recoverable anchor rod according to claim 1, further comprising a grouting unit comprising a grouting device (6) and a grouting channel (4) in fluid communication, wherein, One or more grouting channels (4) deployed within the anchor rod (1) for providing a delivery channel for a reinforcing slurry; And a grouting device (6) arranged at the drill hole (7) for providing the reinforcing slurry to the grouting channel (4).
5. A recoverable anchor rod according to claim 3, wherein the strain sensor (9) is configured to record and transmit time dependent stress variation information of the anchor rod (1) with a preset strain amplitude of the anchor rod (1) as a start event, wherein the preset strain amplitude of the anchor rod (1) is adjustable based on a time dependent curve of the anchoring force of the anchor rod (1).
6. The recoverable anchor rod according to claim 5, wherein the sampling period of the strain sensor (9) for the anchor rod (1) anchoring force is determined based on the time taken by the anchor rod (1) to generate a single preset strain amplitude, wherein the ratio of the sampling period of the strain sensor (9) to the preset strain amplitude is capable of characterizing the stress rate of the anchor rod (1).
7. A method of recycling a recyclable anchor rod as claimed in any one of claims 1 to 6, comprising: controlling the anchor rod (1) to be in a tensioning state so as to allow the annular teeth (11) of the recovery device (2) to be meshed with the bearing table (12); driving the free-section anchor rod (101) to rotate along a first direction and enabling the recovery device (2) to generate a first torque along the first direction; -the anchor segment anchor (102) generating a second torque based on the rotation of the free segment anchor (101); The free section anchor rod (101) is separated from the anchoring section anchor rod (102) under the action of first torque and second torque which are opposite to each other.
8. The recycling method according to claim 7, further comprising: Before or when the free section anchor rod (101) is in a tension state and is driven to rotate along a first direction, hydraulic oil is injected into an oil pipe channel (13) of the anchoring section anchor rod (102) by using an external pressurizing pipeline (10), so that the hydraulic oil permeates into the micro-gap (21) to provide static pressure moment for assisting the loosening of the anchoring section anchor rod (102) and the threaded hole (15).

Description

Recyclable anchor rod and recycling method thereof Technical Field The invention relates to the technical field of geotechnical engineering supporting structures, relates to a drilling technology of soil layers or rocks, and particularly relates to a recyclable anchor rod and a recycling method thereof. Background Along with the continuous promotion of urban construction in China, the surrounding rock control theory and technology of deep underground engineering have important significance for guaranteeing the safety and high-efficiency construction and production of underground engineering, and the most effective way for controlling underground surrounding rock is to apply an anchor rod to a drilled hole, so that the anchor rod has decisive effect for guaranteeing the safety of underground engineering construction. The anchor rod is a supporting member made of high-tensile-strength material and installed in surrounding rock, and is mainly used for supporting engineering such as open-air side slopes, underground caves, roadway engineering, building foundation pits and the like. The traditional anchor rod is used as a temporary supporting structure, is usually buried underground together with a structure of a building after the function of the traditional anchor rod is invalid, and occupies a large amount of underground space to form underground garbage, so that underground environment pollution is caused, the remained anchor rod also becomes an underground obstacle of subsequent engineering, and meanwhile, steel is wasted because the anchor rod cannot be effectively recycled. Besides the time and labor consumption during the dismantling, the conventional anchor rod is difficult to judge whether the anchoring quality of the conventional anchor rod reaches the design standard, so that the recyclable anchor rod is an inevitable product of anchor rod technology development, and a plurality of recyclable anchor rod technologies which generally comprise a drawing type recyclable anchor rod, a hot melt type recyclable anchor rod and a mechanical recyclable anchor rod are already available on the market. The recoverable anchor rod emphasizes that the recoverable anchor rod is self-dismantling and recovering, namely, the anchor rod is self-detached and separated through a recovery unit (such as a self-unlocking anchor or a supporting body) which is arranged on the anchor rod in advance, a forced dismantling means such as drilling machine sleeve beating is not used, the technical key of the recoverable anchor rod of the foundation pit is that the supporting member is a compression member (recovery unit), and the compression member is positioned at the bottom end of the anchor rod body of the pressure type anchor rod (and the unit anchor rod of the pressure dispersion anchor rod), bears the tension of the anchor rod and transmits the tension to the consolidation body in a pressure mode. The mechanical recoverable anchor rod is a pressure anchor rod, the anchor head is provided with one or two wedge-shaped bodies by utilizing the expansion shell principle, and the anchor head gradually expands along with the entering of the rod body to apply a certain force to the rock mass, and the shell and the rock mass generate friction to form an anchoring force. CN102605780B discloses a recoverable anchor rod for supporting foundation pit, which comprises a concrete prefabricated member and a round steel anchor rod, wherein a hollow metal threaded sleeve is arranged in the concrete prefabricated member, the front end part of the round steel anchor rod is provided with external threads and is in threaded connection with the concrete prefabricated member through the metal threaded sleeve, the tail part of the round steel anchor rod is provided with locking threads, the round steel anchor rod comprises at least two sections of steel rods, the two sections of steel rods are connected through nuts, and the spiral direction of the nuts is opposite to that of the threads at the front end part of the round steel anchor rod. CN109723060a discloses a manually and mechanically recoverable anchor rod and its recovery method, specifically, including the reinforcing bar body, supporting body and rubber seal, plastic sleeve's inside is provided with the plastic sleeve connector, and the inside of plastic sleeve connector is provided with the reinforcing bar body, connect through screw interlock between reinforcing bar body and the conical tool to lock, and conical tool to lock breaks away from the cutting ferrule and pass through flat head screwed connection with the tool to lock, conical tool to lock and rubber seal single face bonding connection, the grip strengthening rib is all installed to the left and right sides of supporting body, and the supporting body is located plastic sleeve's top, the inside of supporting body is provided with tool to lock ring positioner, and the inside of tool to lock ring positioner is provided with conical too