Acoustic emission monitoring and transmission system for engineering rock mass

Patent metadata

Field	Value
Publication number	US-10823706-B2
Application number	US-201816015218-A
Country	US
Kind code	B2
Filing date	Jun 22, 2018
Priority date	Jun 23, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present invention discloses an acoustic emission monitoring and transmission system for engineering rock mass including an acoustic emission sensor and a ground workstation. The acoustic emission sensor is installed in a borehole of the monitored rock mass and transmits a received monitoring signal to the ground workstation through a cable. The acoustic emission sensor includes an acoustic emission probe, a probe installation mechanism and a transmission mechanism which transmits the probe installation mechanism with the acoustic emission probe to a setting position inside the borehole. The probe installation mechanism includes a shell connecting to the transmission mechanism and a probe sleeve for accommodating the acoustic emission probe.

First claim

The invention claimed is:

1. An acoustic emission monitoring and transmission system for engineering rock mass, comprising:
an acoustic emission sensor, and
a ground workstation; wherein
the acoustic emission sensor is configured to be installed inside a borehole of a monitored rock mass, and transmit a monitoring signal to the ground workstation through a cable,
a computer in the ground workstation is configured to process and display the monitoring signal from the acoustic emission sensor,
the acoustic emission sensor comprises an acoustic emission probe, a probe installation mechanism, and a transmission mechanism transmitting the probe installation mechanism with the acoustic emission probe to a setting position inside the borehole,
a number of the acoustic emission probe is at least one, a number of probe installation mechanisms is equal to a number of the acoustic emission probes,
the ground workstation further comprises an inflation and deflation device,
the probe installation mechanism comprises a shell, a probe sleeve, an end cap, two springs, a gasbag, and connection components,
the shell is a cylinder with two open ends,
an inner hole of the shell is provided with an upper guide cylinder and a lower guide cylinder for combining with the probe sleeve,
the upper guide cylinder is located at a top of an inner wall of the shell,
a first notch is arranged at a first end of a wall of the upper guide cylinder toward one or both ends of the shell for allowing a cable connector of the acoustic emission probe to pass through,
the lower guide cylinder is located at a bottom of the inner wall of the shell and the inner hole is a through hole passing through a wall of the shell,
a center line of the upper guide cylinder is in line with a center line of the lower guide cylinder and is perpendicular to a center line of the shell,
the probe sleeve is a cylinder with a closed lower end and an open upper end,
an inner hole of the probe sleeve is in clearance fit with the acoustic emission probe and an outer shape of the probe sleeve is in a clearance fit with an inner hole of the lower guide cylinder,
a lower end face of the probe sleeve is an arc face matched with an arc of the borehole of the monitored rock mass, and an upper end of a wall of the probe sleeve is provided with one or two second notches for the cable connector of the acoustic emission probe to protrude,
an outer wall of the probe sleeve is provided with two spring seats, wherein a number of the second notches is two, the two notches are symmetrically distributed with respect to a center line of the probe sleeve and the two spring seats are symmetrically distributed with respect to the center line of the probe sleeve,
a line between projections of center lines of the two spring seats in a horizontal plane is perpendicular to a line between projections of center lines of the second notches in the horizontal plane,
an inner edge of the end cap is matched with the probe sleeve, and an outer edge of the end cap is in clearance fit with an inner hole of the upper guide cylinder arranged on the shell,
the connection components are two sets, respectively installed at the two open both ends of the shell,
the acoustic emission probe is installed inside the probe sleeve,
the cable connector protrudes from the second notch arranged on a side wall of the probe sleeve,
the end cap covers an upper end face of the probe sleeve and is detachably connected to the probe sleeve,
the probe sleeve with the acoustic emission probe is placed inside the shell,
a lower section of the probe sleeve is inserted into the lower guide cylinder arranged on the shell,
the lower end of the probe sleeve is outside the shell,
an upper section of the probe sleeve is inserted into the upper guide cylinder arranged on the shell,
the orientation of the probe sleeve makes the cable connector of the acoustic emission probe face toward the end of the shell,
the gasbag is placed on a chamber enclosed by the upper guide cylinder and the end cap, connected to the inflation and deflation device in the ground workstation through a gas tube, wherein a number of the springs is two,
a first end of each of the two springs is respectively connected to each of the two spring seats and a second end of each of the two springs is respectively connected to the inner wall of the shell on both sides of the upper guide cylinder, and
after installed, the two springs are in a stretched or a free state, the transmission mechanism is connected to the connection components installed on the shell.

2. The acoustic emission monitoring and transmission system for engineering rock mass according to claim 1 , wherein
each of the connection components comprises a nut and at least two pairs of connection brackets,
a first end of each of the connection brackets is uniformly distributed around an outer wall of the nut and hinged with the outer wall of the nut, and
a second end of each of the connection brackets is fixedly connected with the shell.

3. The acoustic emission monitoring and transmission system for engineering rock mass according to claim 2 , wherein
the transmission mechanism comprises transmission rods, connection rods, and roller components,
a connection screw hole is arranged at a center of a first end of each of the transmission rods,
a connection hole is arranged at a center of a second end of each of the transmission rods,
a first fastening screw is arranged on a wall of the connection hole,
a type and a size of an internal thread of the connection screw hole are the same as a type and a size of an internal thread of the nut of the connection component,
each of the connection rods comprises a thread section and a column section and is used for a connection between the transmission rods and the connection components and a connection between the transmission rods,
a type and a size of an external thread of the thread section are matched with the type and the size of the internal thread of the connection screw hole arranged on each transmission rod,
a shape and a size of the column section are matched with a shape and a size of the connection hole arranged on each transmission rod,
when the column section of each of the connection rods is inserted into the connection hole of each of the transmission rods, the column section of each of the connection rods and the connection hole is fixed by the first fastening screw,
each of the roller components comprises rollers, U-shaped installation plates, axles and a roller sleeve,
a number of the rollers is two or three,
a number of the U-shaped installation plates and a number of the axles are the same as the number of the rollers,
each roller is respectively installed on a corresponding axle, both ends of the corresponding axle are respectively installed on two side plates of a corresponding U-shaped installation plate, so that each roller is respectively located between the two side plates of the corresponding U-shaped installation plate,
an inner hole of the roller sleeve is larger than an outer dimension of each of the transmission rod and a wall of the roller sleeve is provided with a second fastening screw,
each U-shaped installation plate is respectively fixedly connected to an outer wall of the roller sleeve,
when a number of U-shaped installation plates is two, the angle between center lines of the two U-shaped installation plates is 120-135 degrees,
when the number of the U-shaped installation plates is three, center lines of two U-shaped installation plates are on a straight line, and angles between a center line of the remaining U-shaped installation plate and center lines of the two U-shaped installation plates are 90 degrees, and
each transmission rod is provided with at least one set of the roller components, and the roller sleeve of

Assignees

• Univ Sichuan

Inventors

• Liu Jianfeng
• Wang Lu
• Wang Chunping
• Pei Jianliang
• Xu Huining
• Zheng Jun

Classifications

• E21B47/12

  Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling · CPC title

• E21B47/01

  Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like · CPC title

• G01N2291/0232

  Glass, ceramics, concrete or stone · CPC title

• G01N29/2475

  Embedded probes, i.e. probes incorporated in objects to be inspected · CPC title

• E21B47/14

  using acoustic waves · CPC title