A device and method for installing and testing a tunnel top drilling sonic wave test probe

Abstract

The invention discloses an installation and testing device and method for a tunnel top drilling sonic wave test probe, the installation and testing device comprises an orifice fixing sleeve, an orifice cover plate, a sonic wave test probe installed on the orifice cover plate, a connecting seat, a push rod, an exhaust hose and an exhaust floating ball, the orifice fixing sleeve is fixed at the orifice of the tunnel top drilling hole, the orifice cover plate is installed in the orifice fixing sleeve; the push rod is installed at the middle of the orifice cover plate through a lifting device, and a sealing component is provided between the inner side of the orifice cover plate and the push rod; the sonic wave test probe is installed at the top of the push rod through the connecting seat; when in use, the height of the push rod is adjusted by the lifting device, so that the sonic wave test probe can be in the acoustic emission test at different positions in the borehole. The invention has a simple structure, is easy to operate, can be reused, can flexibly control the length of the entire push rod, is suitable for tunnel top hole measurement of various depths, and can accurately control the push distance of the sonic wave test probe through the scale line.

Description

Technical Field

[0001] The invention belongs to the technical field of acoustic wave testing, and in particular relates to an installation and testing device and method for a tunnel top drilling acoustic wave testing probe, which is suitable for measuring the relaxation depth of the tunnel top. Background Art

[0002] During the process of excavating underground rock masses, such as tunneling, the rock mass experiences a change in stress state, shifting from a triaxial state to a biaxial or uniaxial state. This also redistributes the internal stresses, potentially causing microcracks within the rock to develop as a result of these changes. This can lead to structural instability at the free surface and the creation of loose zones, jeopardizing the safety of the construction site. Acoustic wave testing is an elastic wave testing technique based on the theory of elastic wave propagation in solid media. When a certain sound wave propagates through a rock mass, its inherent energy is minimal, exerting little external force on the rock. Therefore, the rock mass assumes an elastic state, satisfying Hooke's law. The elasticity theory allows the velocity of longitudinal waves in the rock to be derived. The method typically involves emitting sound waves into the medium through excitation. The modulated sound waves are then received at a spatial location some distance from the source. By observing and analyzing the sound wave's propagation velocity, amplitude, frequency, and other acoustic characteristics within the medium, some physical properties of the medium can be deduced. Acoustic wave testing has a wide range of applications in geological exploration and other fields, such as structural characteristic evaluation and strength classification of rock and soil, determination of loose zone of tunnel surrounding rock, determination of elastic mechanical parameters of rock and soil, and quality inspection after rock construction.

[0003] Because acoustic wave testing is a nondestructive testing technology with a simple principle and easy operation, it is widely used in testing the relaxation depth of tunnel surrounding rock. Currently, the commonly used acoustic wave testing techniques include the double-hole penetration method and the single-hole refraction wave method. The double-hole penetration method first drills two parallel boreholes on the surface of the rock mass to be tested. The transmitting and receiving sensors are placed between the two holes. The acoustic wave signal is released by the transmitter, passes through the medium and rock formations via the transmitting sensor, is received by the receiving sensor, and transmitted to the receiver, completing data collection and recording. This method not only requires the two borehole axes to be parallel, but also requires two boreholes to be drilled in the tested area, which causes greater damage and increases the workload. The simpler single-hole acoustic refraction method requires only a single borehole and employs a single-hole acoustic tester with fixed-distance, dual-receiver transducers. During use, the single-hole acoustic tester is placed in the borehole and filled with a coupling agent (usually water) as a medium. The instrument receives the acoustic wave signal emitted by the transmitting transducer after it is reflected by the borehole wall. As the sound wave propagates along the borehole wall, its velocity is significantly affected by the geological structure of the rock formation. The variation in this velocity reflects the structural characteristics of the rock formation in the borehole wall. The role of the water coupling agent is crucial for a smooth testing process. For vertical boreholes or those sloping downward on the sides of a tunnel, engineers can directly fill the borehole with water or use water-blocking airbags to achieve a certain degree of sealing, ensuring that the borehole is fully coupled with water. However, this method is often difficult to implement for boreholes drilled from the top of a tunnel. Firstly, the movement of the acoustic test probe during testing makes it difficult to ensure effective sealing of the borehole end, resulting in water loss and insufficient coupling agent, making testing impossible. Secondly, because the acoustic test probe lacks a support structure, the sensor sticks to the rock wall, affecting the test results. In addition, there is no precise scale control for the moving distance of the acoustic test probe, which leads to a certain error in determining the relaxation depth of the surrounding rock based on the acoustic test results.

[0004] Therefore, an acoustic wave test probe installation and testing device that can be used for tunnel top drilling, has high test accuracy, and is easy to operate is invented, which has significant engineering application value. Summary of the Invention

[0005] The present invention aims to solve the problem of installing and testing a tunnel top borehole acoustic wave test probe which is difficult to achieve in the prior art, and proposes an installation and testing device and method for the tunnel top borehole acoustic wave test probe.

[0006] The orifice cover plate designed by the present invention solves the contradiction between the airtightness of the top hole and the interaction between the inside and the outside by designing a water-blocking device and opening holes with specific functions, and cooperates with an improved acoustic wave test probe; a detachable push rod is used to transport the acoustic wave test probe, which can accurately and flexibly control the travel distance of the acoustic wave test probe in the hole. The rigid support provided by the push rod to itself and the acoustic wave test probe can effectively solve the potential wall-adhering problem of the acoustic wave test probe and reduce test errors.

[0007] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0008] A device for installing and testing a tunnel top borehole acoustic wave test probe comprises an orifice fixing sleeve, an orifice cover plate, and an acoustic wave test probe mounted on the orifice cover plate, a connecting seat, a propulsion rod, an exhaust hose, and an exhaust float ball. The orifice fixing sleeve is fixedly mounted at the orifice of a tunnel top borehole, and the orifice cover plate is detachably mounted in the orifice fixing sleeve.

[0009] The push rod is installed in the middle of the orifice cover plate through a lifting device, and a sealing assembly is provided between the inner side of the orifice cover plate and the push rod; the connecting seat is detachably installed on the top of the push rod inside the drill hole, and the acoustic wave test probe is installed on the connecting seat. The connecting seat is provided with a space for installing a power supply and a wireless transmission device, and the acoustic wave test probe is electrically connected to the power supply and the wireless transmission device;

[0010] The orifice cover is provided with at least one exhaust hole and an inlet and outlet hole running through the upper and lower parts. The inner side of the exhaust hole is connected to one end of the exhaust hose, and the other end of the exhaust hose is connected to the exhaust float ball. The exhaust float ball is a low-density ball with an exhaust hole on the top; a control valve is provided on the outer side of the inlet and outlet hole.

[0011] Furthermore, the lifting device includes a sliding hole provided in the middle of the orifice cover plate for the push rod to move up and down, and a lifting nut provided inside the orifice cover plate, which is coaxial with the sliding hole and can rotate freely. The push rod is installed in the sliding hole and is installed in conjunction with the lifting nut. By turning the lifting nut, the push rod can be driven to move up and down to adjust the installation height of the acoustic wave test probe.

[0012] Furthermore, the lifting nut is a special-shaped nut, one end of which is provided with an annular boss that can be installed in the hole cover plate, and the other end extends out of the outside of the hole cover plate to form a clamping part that is convenient for twisting it.

[0013] Furthermore, the sealing assembly includes an annular sealing cover plate provided on the orifice cover plate and coaxial with the propulsion rod, and the annular sealing cover plate is filled with elastic sealing material.

[0014] Furthermore, the elastic sealing material is a TPE water-blocking material, and holes are opened in the middle of the annular sealing cover plate and the TPE water-blocking material. The hole diameter of the annular sealing cover plate is slightly larger than the external thread diameter of the push rod, and the hole diameter of the TPE water-blocking material is slightly smaller than the external thread diameter of the push rod, and the thickness is slightly larger than the internal height of the annular sealing cover plate, so that it is elastically compressed to improve the waterproof ability.

[0015] Furthermore, the annular sealing cover plate is a cylindrical tube with a single-side opening and an inverted buckle. The top of the cylindrical tube is provided with a through hole for the propulsion rod to freely pass through. The orifice cover plate is provided with a bolt fixing bracket, and the annular sealing cover plate is removably fixed to the orifice cover plate by bolts. The annular sealing cover plate is provided with a screw hole on the side, and is fixed using a screw rod via the bolt fixing bracket.

[0016] Furthermore, the propulsion rod is composed of a number of sub-propulsion rods spliced ​​end to end, and each sub-propulsion rod is provided with a scale. The installation height of the acoustic wave test probe can be accurately obtained by the scale and the number of sub-propulsion rods.

[0017] Furthermore, adjacent sub-propulsion rods are detachably connected via screw holes and protruding threaded heads.

[0018] Furthermore, each of the sub-propulsion rods is 100 cm long, and the rod body is painted red with 4 scale lines set at 20 cm intervals, which can more accurately grasp the propulsion distance of the equipment.

[0019] Furthermore, the sub-propulsion rods are provided with pin holes at the engaging positions of the connecting and disassembling threads thereof, for placing pins to prevent relative rotation between the sub-propulsion rods during the rotation process.

[0020] Furthermore, the push rod is required to have a curvature that satisfies the requirement that the acoustic wave test probe moves substantially along the hole axis when bearing the acoustic wave test probe and its own weight, taking into account its material strength and the diameter of the push rod.

[0021] Furthermore, the connecting seat includes an upper cavity and a lower cavity connected by threads. The middle of the top of the upper cavity is concave to form a positioning groove for installing the acoustic wave test probe. The bottom of the positioning groove is provided with a through hole for convenient threading. The acoustic wave test probe is installed in the positioning groove by gluing; the middle of the bottom of the lower cavity is provided with a screw hole connected to the push rod.

[0022] Furthermore, the orifice fixing sleeve is fixed to the orifice of the hole drilled on the top of the tunnel by cement mortar, and the orifice cover plate is installed in the orifice fixing sleeve by threaded engagement.

[0023] Furthermore, the connector includes a wireless transmission device that connects to the acoustic wave test probe for data transmission. The device includes a microprocessor and a Bluetooth transmitter, utilizing the Bluetooth 4.0 protocol. This wireless transmission method eliminates the need for wire holes in the port cover, improving airtightness. The Bluetooth 4.0 protocol offers significant advantages, including high transmission rates, low energy consumption, and a long transmission range.

[0024] The connecting base as described above contains a detachable rechargeable battery, which is connected to the wireless transmission device and the acoustic wave test probe and supplies power to them.

[0025] A method for installing and testing a tunnel top borehole acoustic wave test probe, using the above-mentioned installation and testing device, includes the following steps:

[0026] Step 1: Use cement mortar to couple the hole fixing sleeve to the hole position;

[0027] Step 2: Install the push rod in the middle of the orifice cover plate through the lifting device, extend the top of the push rod into the inner side of the orifice cover plate, and install the sealing assembly between the inner side of the orifice cover plate and the push rod;

[0028] Step 3: Install the connector and the acoustic wave test probe on the top of the push rod, and debug the power supply and wireless transmission device inside the connector;

[0029] Step 4: Install the exhaust hose and exhaust float ball on the exhaust hole of the orifice cover, and connect the inlet and outlet holes and the control valve to the water supply source;

[0030] Step 5: Install the orifice cover plate in the orifice fixing sleeve, and push the push rod through the lifting device to make the acoustic wave test probe reach the bottom of the hole drilled at the top of the tunnel;

[0031] Step 6: Open the control valve on the inlet and outlet holes, and inject water into the hole at the top of the tunnel. Simultaneously, exhaust air through the exhaust float and exhaust hose until the hole is filled with water.

[0032] Step 7: Turn on the acoustic wave test probe to transmit the sound wave, receive and observe the waveform of the sound wave reflected by the rock mass, and record the stable wave velocity at the point when the waveform stabilizes;

[0033] Step 8: Lower the height of the acoustic wave test probe by the lifting device, wait for the waveform to stabilize, record the point position and the corresponding wave velocity, and repeat this cycle until the acoustic wave test probe reaches the hole mouth, and the test is completed.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The present invention forms a closed space when conducting acoustic wave testing on the tunnel top borehole, which effectively solves the problem that the existing method is difficult to fill the tunnel top borehole with water and meets the acoustic wave testing conditions;

[0036] 2. The present invention adopts wireless data transmission, which overcomes the problem of relying on data lines to realize information interaction in device data transmission, while reducing the number of openings in the closed device, further ensuring the airtightness of the drilled holes during the acoustic wave test, which simplifies the acoustic wave test device and ensures the test function of the test device.

[0037] 3. The present invention uses a propeller and a hole cover plate to control the axial movement of the sonic wave test probe along the borehole. The rigid propeller that meets the curvature requirements provides sufficient support to effectively control the trajectory of the sonic wave test probe (movement along the borehole axis), thereby resolving the potential problem of the sonic wave test probe adhering to the borehole wall.

[0038] 4. The push rod of the present invention is a removable rod with graduations marked on it. During operation, the sonic wave test probe is raised and lowered by rotating the lifting device. The highest scale line observed outside the hole is used as a reference, and the distance between each two scale lines is used as a scale. The number of scale lines is recorded during the process, achieving accurate positioning of the sonic wave test probe within the hole. In addition, for boreholes of varying depths, the flexible connection of multiple push rods can meet the test condition that the sonic wave test probe must reach the bottom of the hole. 5. The present invention has a simple structure, is easy to operate, and can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is an overall longitudinal sectional view of the present invention;

[0040] Figure 2 This is the main view of the propulsion rod;

[0041] Figure 3 This is a top view of the propulsion rod (enlarged);

[0042] Figure 4 This is the main view of the lifting nut;

[0043] Figure 5 It is a top view of the lifting nut;

[0044] Figure 6 This is the main view of the orifice cover;

[0045] Figure 7 It is a top view of the orifice cover;

[0046] Figure 8 It is a top view of the lower half of the connecting seat;

[0047] Figure 9 It is a cross-sectional view of the connecting seat;

[0048] Figure 10 It is a top view of the annular sealing cover.

[0049] Among them, 1-exhaust float ball, 2-exhaust hose, 3-connecting seat, 31-upper cavity, 32-lower cavity, 33-positioning groove, 34-through hole, 35-screw hole, 4-wireless transmission device, 5-hole fixing sleeve, 6-exhaust hole, 7-hole cover, 71-protruding bolt, 72-sliding hole, 8-sonic test probe, 9-detachable rechargeable battery, 10-propelling rod, 101-sub-propelling rod, 11-inlet and outlet holes, 12-control valve, 13-lifting nut, 131-annular boss, 132-clamping part, 14-annular sealing cover, 15-bolt fixing bracket, 16-TPE water-blocking material, 17-pin hole. DETAILED DESCRIPTION

[0050] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0051] like Figures 1 to 10 As shown, a device for installing and testing a tunnel top borehole acoustic wave test probe comprises an orifice fixing sleeve 5, an orifice cover plate 7, an acoustic wave test probe 8 mounted on the orifice cover plate 7, a connecting seat 3, a propulsion rod 10, an exhaust hose 2, and an exhaust float ball 1. The orifice fixing sleeve 5 is fixed at the orifice of the tunnel top borehole, and the orifice cover plate 7 is detachably mounted in the orifice fixing sleeve 5.

[0052] The push rod 10 is installed in the middle of the orifice cover plate 7 through a lifting device, and a sealing assembly is provided between the inner side of the orifice cover plate 7 and the push rod 10; the connecting seat 3 is detachably mounted on the top of the push rod 10 inside the borehole, and the acoustic wave test probe 8 is installed on the connecting seat 3. A space for installing a power supply and a wireless transmission device 4 is provided inside the connecting seat 3, and the acoustic wave test probe 8 is electrically connected to the power supply and the wireless transmission device 4;

[0053] The orifice cover plate 7 is provided with at least one exhaust hole 6 and an inlet and outlet hole 11 running through the upper and lower parts. The inner side of the exhaust hole 6 is connected to one end of the exhaust hose 2, and the other end of the exhaust hose 2 is connected to the exhaust float ball 1. The exhaust float ball 1 is a low-density ball with an exhaust hole 6 on the top; a control valve 12 is provided on the outside of the inlet and outlet hole 11.

[0054] like Figure 1 、 Figure 8 and Figure 9As shown, the connecting seat 3 is a cavity device formed by the upper and lower parts being engaged by threads, which contains a detachable rechargeable battery 9 as a power source and a wireless transmission device 4 for wireless communication. In this embodiment, the cavity device is a cylindrical cavity device, which includes an upper cavity 31 and a lower cavity 32 connected by threads. The middle of the top of the upper cavity 31 is concave to form a positioning groove 33 for installing the acoustic wave test probe 8. The bottom of the positioning groove 33 is provided with a through hole 34 for convenient threading, which is used for the line of the acoustic wave test probe 8 to pass through. The acoustic wave test probe 8 is installed in the positioning groove 33 by gluing, and the joint between the connecting seat 3 and the acoustic wave test probe 8 is sealed with silicone sealant; the middle of the bottom of the lower cavity 32 is provided with a screw hole 35 connected to the push rod 10.

[0055] like Figure 1 、 Figure 9 As shown, the acoustic wave test probe 8 is fixed to the top of the connecting seat 3 through the positioning groove 33, and the push rod 10 is engaged with the screw hole 35 at the bottom of the connecting seat 3 through a thread; the push rod 10 is installed at the middle of the orifice cover plate 7 through a lifting device, and the lifting device includes a sliding hole 72 provided in the middle of the orifice cover plate 7 for the push rod 10 to move up and down, and a lifting nut 13 provided inside the orifice cover plate 7 and coaxial with the sliding hole 72 and capable of rotating freely. The lifting nut 13 is embedded in the orifice cover plate 7, and the inner hole of the lifting nut 13 is provided with a thread engaged with the push rod 10, as shown in FIG. Figure 4 and Figure 5 As shown, the lifting nut 13 is a special-shaped nut, one end of which is provided with an annular boss 131 that can be installed in the orifice cover plate 7, and the other end extends outside the orifice cover plate 7 to form a clamping portion 132 for convenient twisting. The orifice cover plate 7 also has an inlet and outlet hole 11 and a control valve 12. A bolt fixing bracket 15 for fixing the annular sealing cover plate 14 is welded to the inside of the hole. The inner port of the exhaust hole 6 is connected to the exhaust hose 2 with glue, and the other end of the exhaust hose 2 is connected to the exhaust float 1 with glue. The orifice fixing sleeve 5 is coupled to the drilled hole wall using cement mortar and has a thread on the inside for engaging the orifice cover plate 7 to support the orifice cover plate 7 and the device thereon.

[0056] like Figure 6 and Figure 7 As shown, the middle of the lower part of the orifice cover plate 7 protrudes to form a hexagonal columnar protruding bolt 71, which is convenient for screwing the orifice cover plate 7 and the orifice fixing sleeve 5 for threaded installation. The protruding bolt 71 and the orifice cover plate 7 itself can be manufactured in an integrated manner or can be manufactured separately and welded together.

[0057] The tail screw of the embedded lifting nut 13 has no threads. After extending from the hole cover plate 7, a hexagonal clamping portion 132 is provided. The embedding method is: first split the hole cover plate 7 in half, so that the annular boss 131 of the lifting nut 13 is embedded in the cavity in the protruding bolt 71, and then the hole cover plate 7 that is split in half is welded back to its original position. The embedded contact surface between the lifting nut 13 and the hole cover plate 7 is lubricated with lubricating oil.

[0058] The annular sealing cover plate 14 and the TPE water-blocking material 16 (elastic sealing material) are both provided with holes in the middle. The hole diameter of the annular sealing cover plate 14 is slightly larger than the external thread diameter of the push rod 10, while the hole diameter of the TPE water-blocking material is slightly smaller than the external thread diameter of the push rod 10. The thickness of the TPE water-blocking material is slightly larger than the internal height of the annular sealing cover plate 14, so that it is elastically compressed to enhance waterproofing capability.

[0059] Screw holes are provided on the side of the annular sealing cover plate 14 , and the bracket 15 is fixed with screw rods by means of bolts.

[0060] The exhaust hole 6 is connected to the exhaust hose 2 with glue, and there is an exhaust float ball 1 at the upper end of the exhaust hose 2. In this embodiment, the exhaust float ball 1 is a plastic ball with a hole at the top, which can ensure that the hose floats on the liquid surface when there is liquid, and is used to discharge the gas in the hole and detect whether the water level in the hole is full.

[0061] A control valve 12 is installed on the outside of the inlet and outlet holes 11 to control the water inlet rate, prevent water backflow, and facilitate water inlet and outlet.

[0062] like Figure 2 and Figure 3 As shown, the propulsion rod 10 is a detachable propulsion rod 10, which is composed of several sub-propulsion rods 101 connected end to end. Specifically, the screw hole at the tail of the front rod is threadedly engaged with the screw at the top of the rear rod to meet the requirements of drilling holes of different depths.

[0063] like Figure 1 As shown, the push rod 10 has a pin hole 17 at the engaging portion of the connecting and disconnecting threads thereof, for placing a pin to prevent relative rotation between the sub-propelling rods 101 during the rotation process;

[0064] Each sub-propulsion rod 101 is 100 cm long, and the rod body is painted red with 4 scale lines set at 20 cm intervals. Each scale line is in millimeters, which can accurately grasp the propulsion distance of the equipment.

[0065] Connector 3 houses a wireless transmission device 4, which connects to the acoustic wave test probe 8. This device is used for data transmission and comprises a microprocessor and a Bluetooth transmitter, utilizing the Bluetooth 4.0 protocol. This wireless transmission method eliminates the need for wire holes in the port cover 7, improving airtightness. Bluetooth 4.0 offers significant advantages, including high transmission rates, low energy consumption, and a long transmission range.

[0066] During implementation, first, the orifice fixing sleeve 5 is coupled to the drill hole position using cement mortar; then, the top of a section of the push rod 10 is passed through the lifting nut 13 and the orifice cover plate 7 to reach the inner side of the cover plate hole, and the screw hole at the bottom of the connecting seat 3 is engaged with the screw at the top of the first section of the push rod 10, and then the bottom of the acoustic wave test probe 8 is connected to the positioning groove 33 at the top of the connecting seat 3 using silicone sealant, and the line of the acoustic wave test probe 8 is connected to the wireless transmission device 4 and the power supply; the exhaust hole 6 of the orifice cover plate 7 is connected with the exhaust float at the other end using glue. The exhaust hose 2 of the ball 1; then insert the TPE water-blocking material between the annular sealing cover plates 14 and press it hard to make it fully fit with the orifice cover plate 7, and use bolts to pass through the bolt fixing bracket 15 to fix the annular sealing cover plate 14; finally, connect the control valve 12 outside the inlet and outlet holes 11 outside the orifice cover plate 7 to the water source, and fix the orifice cover plate 7 and the orifice fixing sleeve 5 installed with the above device through threaded engagement, and then connect multiple sub-propelling rods 101 and rotate the lifting nut 13 to make the acoustic wave test probe 8 reach the bottom of the hole, and the entire device is installed.

[0067] During testing, open the control valve 12 outside the inlet and outlet holes 11 and inject water into the hole until water continuously overflows from the exhaust hole 6, indicating that the hole is full. At this point, the acoustic wave test probe 8 transmits sound waves, receives and observes the waveform of the sound waves reflected by the rock mass, and records the stable wave velocity at that point when the waveform stabilizes. Rotate the lifting nut 13 outside the orifice cover 7 to move the push rod 10 downward by one or more scale marks (20 cm). Once the waveform stabilizes, record the point and corresponding wave velocity. Repeat this cycle until the acoustic wave test probe 8 reaches the orifice, and the test is complete. To recycle the device, remove the water source from the inlet and outlet holes 11, open the port control valve 12 to drain the water, and wait for the water flow to gradually cease. Then, rotate the orifice cover 7 to remove the entire test device, and in turn, remove the acoustic wave test probe 8, connector 3, push rod 10, and exhaust hose 2 with exhaust float 1. Finally, remove the coupling orifice fixing sleeve 5 by tapping and reclaim the orifice fixing sleeve 5.

[0068] 1. This device uses the orifice cover plate 7 in combination with the small channel, so the test space is almost completely closed, and the coupling fluid can be kept filled, meeting the test conditions of the top drilling acoustic wave test;

[0069] 2. This device uses a propulsion rod 10 and a hole cover plate 7 to control the axial movement of the acoustic wave test probe 8 along the borehole, which can solve the potential problem of the acoustic wave test probe 8 fitting the hole wall in the hole;

[0070] 3 The propulsion rod 10 of this device is a detachable and recyclable propulsion rod 10 with a scale, which is flexible and convenient and can accurately control the propulsion distance;

[0071] 4. This device uses wireless data transmission and is equipped with a water-blocking device at the orifice, which is very helpful in improving the airtightness of the test space;

[0072] 5. This device can be disassembled and recycled after use, and the operation is simple, which can ensure the efficiency of continuous construction.

[0073] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An installation and testing device for a tunnel top drilling acoustic wave test probe, Features: It includes an orifice fixing sleeve, an orifice cover plate, and a sonic wave test probe installed on the orifice cover plate, a connecting seat, a propulsion rod, an exhaust hose and an exhaust floating ball. The orifice fixing sleeve is fixed at the orifice of the hole drilled on the top of the tunnel, and the orifice cover plate is detachably installed in the orifice fixing sleeve; The push rod is installed at the middle part of the hole cover plate through a lifting device, and a sealing component is provided between the inner side of the hole cover plate and the push rod; the connecting seat is detachably installed on the top of the push rod inside the borehole, and the sonic wave test probe is installed on the connecting seat, and a space for installing a power supply and a wireless transmission device is provided inside the connecting seat, and the sonic wave test probe is electrically connected to the power supply and the wireless transmission device; The orifice cover plate is provided with at least one exhaust hole and an inlet and outlet hole that runs through the upper and lower parts. The inner side of the exhaust hole is connected to one end of an exhaust hose, and the other end of the exhaust hose is connected to an exhaust floating ball. The exhaust floating ball is a low-density ball with an exhaust hole on the top. A control valve is provided on the outer side of the inlet and outlet hole. The lifting device comprises a sliding hole provided in the middle of the orifice cover plate for the push rod to move up and down, and a lifting nut provided inside the orifice cover plate and coaxial with the sliding hole and capable of rotating freely. The push rod is installed in the sliding hole and is installed in cooperation with the lifting nut. By screwing the lifting nut, the push rod can be driven to move up and down to adjust the installation height of the acoustic wave test probe. The connecting seat includes an upper cavity and a lower cavity connected by threads. The middle of the top of the upper cavity is concave to form a positioning groove for installing the acoustic wave test probe. The bottom of the positioning groove is provided with a through hole for easy threading. The acoustic wave test probe is installed in the positioning groove by gluing; the middle of the bottom of the lower cavity is provided with a screw hole connected to the push rod.

2. The installation and testing device of the tunnel top drilling sonic wave testing probe according to claim 1, Features: The lifting nut is a special-shaped nut, one end of which is provided with an annular boss that can be installed in the hole cover plate, and the other end extends out of the hole cover plate to form a clamping part that is convenient for twisting it.

3. The installation and testing device for the tunnel top drilling sonic wave testing probe according to claim 2, Features: The sealing assembly comprises an annular sealing cover plate which is coaxial with the propulsion rod and is provided with an orifice cover plate, and an elastic sealing material is filled in the annular sealing cover plate.

4. The installation and testing device for the tunnel top drilling sonic wave testing probe according to claim 3, Features: The annular sealing cover plate is an inverted cylindrical tube with a single-side opening, and a through hole is provided on the top of the cylindrical tube for the push rod to pass freely. A bolt fixing bracket is provided on the orifice cover plate, and the annular sealing cover plate is detachably fixed to the orifice cover plate by bolts.

5. The installation and testing device for the tunnel top drilling sonic wave testing probe according to claim 4, Features: The push rod is composed of a plurality of sub-push rods connected end to end, and each sub-push rod is provided with a scale. The installation height of the acoustic wave test probe can be accurately obtained by the scale and the number of sub-push rods.

6. The installation and testing device for the tunnel top drilling sonic wave testing probe according to claim 5, Features: Adjacent sub-propelling rods are detachably connected through screw holes and protruding threaded heads, and are provided with pins to prevent relative rotation therebetween.

7. The installation and testing device for the tunnel top drilling sonic wave testing probe according to any one of claims 1 to 6, Features: The hole fixing sleeve is fixed at the hole of the hole drilled on the top of the tunnel by cement mortar, and the hole cover plate is installed in the hole fixing sleeve by threaded fitting.

8. A method for installing and testing a tunnel top drilling sonic wave test probe, using the installation and testing device according to any one of claims 1 to 6, It is characterized in that The installation test method includes the following steps: Step 1: Use cement mortar to couple the hole fixing sleeve to the hole position of the drill hole; Step 2: Install the push rod in the middle of the orifice cover plate through the lifting device, extend the top end of the push rod into the inner side of the orifice cover plate, and install the sealing assembly between the inner side of the orifice cover plate and the push rod; Step 3: Install the connection seat and the acoustic wave test probe on the top of the push rod in sequence, and debug the power supply and wireless transmission device inside the connection seat; Step 4: Install the exhaust hose and the exhaust float ball on the exhaust hole of the orifice cover plate, and connect the inlet and outlet holes and the control valve to the water supply source; Step 5: Install the hole cover plate in the hole fixing sleeve, and push the push rod through the lifting device to make the sonic test probe reach the bottom of the hole drilled at the top of the tunnel; Step 6: Open the control valve on the inlet and outlet holes, and inject water into the hole at the top of the tunnel. The exhaust float ball will lift the exhaust hose to exhaust as the water level in the hole rises, until the exhaust hose drains water, indicating that the hole is full of water. Step 7, turn on the sonic test probe to transmit sonic waves, receive and observe the sonic waveform reflected by the rock mass, and wait for the waveform to stabilize and record the stable wave velocity at the point; Step 8: Lower the height of the sonic wave test probe by the lifting device, wait for the waveform to stabilize, record the point position and the corresponding wave speed, and repeat this cycle until the sonic wave test probe reaches the orifice, and the test is finished.

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