Automatic installation device and usage method for hollow inclusion stress gauges for easy in-situ stress testing

Abstract

This invention discloses an automatic installation device and method for hollow inclusion stress gauges used in geostress testing. The device includes a counterweight at the bottom of the balance support to ensure the strain gauge (A) of the hollow inclusion stress gauge is vertically upward during installation, and to prevent the plunger from dislodging as the gauge advances within the guide hole. A stroke control device limits the displacement of the device body after reaching a designated position. A high-definition camera provides images for the user to observe the accuracy of the hole alignment, enabling visualized installation. An electric actuator pushes the hollow inclusion stress gauge to complete the installation process. This invention is applied to the automatic installation of hollow inclusion stress gauges, offering a simple and highly automated installation process, no limitation on test borehole depth, and accurate strain gauge positioning, making it significant for geostress measurement in mines.

Description

Technical Field

[0001] This invention relates to the field of geostress testing equipment technology, specifically to an automatic installation device and method for using a hollow inclusion stress gauge for geostress testing. Background Technology

[0002] In-situ stress refers to the stress in rock and soil masses caused by gravity, tectonic stress, or human activities. It is one of the most fundamental geological data points in mining and has important reference value for underground engineering design and construction. High in-situ stress zones have a significant impact on underground and tunnel construction. In soft rock strata, it causes large deformation problems such as side heave and bottom heave, while in hard rock strata, it leads to engineering hazards such as rock bursts and large-scale collapses, directly threatening construction safety, delaying construction progress, and causing significant losses. Therefore, when carrying out underground engineering construction activities, it is necessary to first understand the distribution law of in-situ stress at the construction site. Common in-situ stress testing methods include stress recovery method, stress relief method, and hydraulic fracturing method.

[0003] Stress relief method is one of the most commonly used methods for geostress testing. Applying stress relief method in mines not only provides the most accurate and reliable original rock stress data, but is also the most economical. However, the installation hole for hollow inclusion stress gauges is relatively deep, generally exceeding twice the maximum span of the roadway. This requires a long installation rod and a cumbersome installation process, necessitating manual pushing of the rod to the bottom of the borehole, resulting in low efficiency. Furthermore, due to the inconsistency in the lithology of the test borehole, the borehole wall is not uniformly smooth after construction. In addition, the current pushing and connecting device cannot guarantee that the A-strain gauge remains vertically upward during the installation process due to manual operation and other factors, and the inclusion stress gauge may even detach, affecting the accuracy of the test data. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the purpose of this invention is to provide an automatic installation device and method for hollow inclusion stress gauges used in geostress testing. This device solves the problems of cumbersome installation process and inability to complete the installation in one go in geostress testing boreholes, thereby automating the installation of hollow inclusion stress gauges.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This invention provides an automatic installation device for a hollow infill stress gauge that facilitates ground stress testing. The device includes a mobile device body, which contains a balance support for placing the hollow infill stress gauge, several adjusting rods for adjusting the position of the balance support in the hole, a camera device for visualizing the hollow infill stress gauge in the hole, and an electric push rod device for pushing the hollow infill stress gauge into the test borehole.

[0007] The balance support includes a first support and a second support disposed inside the first support and supported and rotated by a balance wheel. The lower part of the second support is provided with a counterweight to keep the A strain gauge of the hollow package stress gauge inside the second support vertically upward.

[0008] The adjusting rod is arranged in a ring at the front end of the balance support. The adjusting rod is electrically connected to the controller to assist in fixing and adjusting the horizontal and vertical position of the balance support, so as to achieve concentricity between the hollow inclusion stress gauge and the test borehole.

[0009] The electric actuator is located behind the balance support and is electrically connected to the controller. The controller controls the piston of the electric actuator to extend and press against the hollow stress gauge, pushing it into the test borehole.

[0010] Preferably, the device body adopts a cylindrical shell, and the device body is provided with an axial propulsion device, which includes a drive wheel set and a guide wheel respectively located at the front and rear ends of the device body. The balance support, stroke control device and electric push rod device are all located inside the cylindrical shell.

[0011] Preferably, the camera device includes several high-definition cameras located in front of the balance support cylinder. The high-definition cameras are electrically connected to the controller and displayed on the monitor to realize the visualization of the hole alignment of the hollow inclusion stress gauge and improve the accuracy of hole alignment.

[0012] Preferably, it also includes a stroke control device for an electrical connection controller. The stroke control device includes several sets of telescopic push rods, which are arranged around the rear of the device body. After the device body reaches the designated position, the telescopic push rods extend and press against the wall around the guide hole to fix the device body.

[0013] Preferably, the electric actuator includes a frame fixed to the device body, a fixing nut at the front end of the frame, and a actuator motor at the rear end of the frame. The output end of the actuator motor is connected to several screws through a gear set in a gearbox and can control their forward and reverse rotation. The front end of each screw is rotatably connected to the fixing nut, and the screws are threadedly connected to the same live nut. A actuator piston is fixed on the live nut, and the front end of the actuator piston is used to press against the hollow package stress gauge.

[0014] Preferably, the adjusting rod is an electric adjusting rod, and there are three of them, which are evenly distributed in a ring on the inner wall of the device body. One of them is located at the bottom of the inner wall of the device body to support the balance support cylinder, and the other two are arranged on both sides as auxiliary adjusting rods.

[0015] The present invention also provides a method for using the above-mentioned automatic installation device for hollow inclusion stress gauges that facilitates in-situ stress testing, comprising the following steps:

[0016] Step 1: Drill a guide hole at the location where the ground stress test is to be conducted, and then drill a test hole concentrically for installing the hollow infill stress gauge. After drilling is completed, perform hole cleaning.

[0017] Step 2: Inject epoxy resin into the cavity of the hollow package, keep the A strain gauge of the hollow package stress gauge vertically upward and place it in the second support of the balance support, and let the cable pass out from the opening at the rear end.

[0018] Step 3: Place the device body in the guide hole, and stop advancing after the device body reaches the designated position. With the assistance of the balance support, ensure that the A strain gauge of the hollow cladding stress gauge is always vertically upward.

[0019] Step 4: Use the controller to control the stroke control device and fix the position of the device body;

[0020] Step 5: Observe the alignment of the hollow inclusion stress gauge with the hole on the monitor, and use the controller to fine-tune the adjustment rod to align the guide head of the hollow inclusion stress gauge with the test borehole;

[0021] Step 6: Use the controller to control the electric actuator to send the hollow inclusion stress gauge into the test hole, and wait for the epoxy resin to cure.

[0022] Step 7: After curing, observe the installation status of the hollow body stress gauge on the monitor, retract the telescopic rod of the stroke control device, and control the retraction of the device body so that the device body and cable device are withdrawn from the guide hole. Then, drill deeper in the guide hole and carry out subsequent stress relief work.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention eliminates the need for manual pushing of the installation rod. The device body is equipped with an axial propulsion device, adopts a cylindrical shape, and has a high degree of automation and high installation efficiency.

[0025] 2. In the process of installing the hollow inclusion stress gauge, the present invention places it inside the first support tube to prevent the plunger of the hollow inclusion stress gauge from falling into the guide hole. At the same time, it can ensure that the A strain gauge remains in a vertically upward position when the hollow inclusion stress gauge is sent into the test borehole, thus ensuring the accuracy of the test results.

[0026] 3. This invention allows for viewing the hole alignment of the hollow infill stress gauge via a controller and display, enabling fine-tuning of the hole alignment and resulting in high installation quality. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the structure of the automatic installation device for the hollow inclusion stress gauge for facilitating ground stress testing provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the balance support provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the arrangement of the balance wheel inside the balance support provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the electric actuator device provided in an embodiment of the present invention;

[0032] Figure 5 Provided for embodiments of the present invention Figure 1 Sectional view of section AA;

[0033] Figure 6 Provided for embodiments of the present invention Figure 1 Sectional view of section BB;

[0034] Figure 7 Provided for embodiments of the present invention Figure 1 Sectional view of the CC section;

[0035] Figure 8 This is a schematic diagram of the structure of the hollow inclusion stress gauge provided in an embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of the device in operation according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1-First support cylinder; 2-Balance wheel; 3-Second support cylinder; 4-High-definition camera; 5-Balance weight; 6-Gear set; 7-Screw; 8-Push rod motor; 9-Push rod piston; 10-Fixing nut; 11-Brake; 12-Sliding nut; 13-Stroke control device; 14-Guide wheel; 15-Controller; 16-Drive wheel set; 18-Adjusting rod; 19-Auxiliary adjusting rod; 20-Epoxy resin cylinder; 21-A strain gauge; 22-Plunger; 23-Guide head. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figures 1 to 9 As shown, an automatic installation device for hollow infill stress gauges for facilitating ground stress testing includes a movable device body. The device body is equipped with a balance support for placing the hollow infill stress gauge, several adjusting rods 18 for adjusting the position of the balance support in the hole, a camera device for visualizing the hollow infill stress gauge in the hole, and an electric push rod device for pushing the hollow infill stress gauge into the test borehole.

[0041] The balance support includes a first support 1 and a second support 3 disposed inside the first support 1 and supported and rotated by a balance wheel 2. The lower part of the second support 3 is provided with a counterweight 5 to keep the strain gauge 21 of the hollow package stress gauge inside the second support 3 vertically upward.

[0042] The adjusting rod 18 is arranged in a ring at the front end of the balance support. The adjusting rod 18 is electrically connected to the controller 15 to assist in fixing and adjusting the horizontal and vertical position of the balance support, so as to achieve concentricity between the hollow package stress gauge and the test borehole.

[0043] The electric actuator is located behind the balance support and is electrically connected to the controller 15. The controller 15 controls the piston 9 of the electric actuator to extend and press against the hollow stress gauge, pushing it into the test borehole.

[0044] The device body adopts a cylindrical shell. The device body is equipped with an axial propulsion device, which includes a drive wheel set 16 and a guide wheel 14 respectively located at the front and rear ends of the device body. The balance support, stroke control device 13 and electric push rod device are all located inside the cylindrical shell.

[0045] The camera device includes several high-definition cameras 4 located in front of the balance support cylinder. The high-definition cameras 4 are electrically connected to the controller 15 and displayed on the monitor to realize the visualization of the hole alignment of the hollow inclusion stress gauge and improve the accuracy of hole alignment.

[0046] The automatic installation device of the present invention also includes a stroke control device 13 of the electrical connection controller 15. The stroke control device 13 includes several sets of telescopic push rods, which are arranged around the rear of the device body. After the device body reaches the designated position, the telescopic push rods extend and press against the wall around the guide hole to fix the device body.

[0047] The electric actuator includes a frame fixed to the main body of the device. A fixing nut 10 is provided at the front end of the frame, and a push rod motor 8 is provided at the rear end of the frame. The output end of the push rod motor 8 is connected to several screws 7 through a gear set 6 in a gearbox and can control their forward and reverse rotation. The front end of each screw 7 is rotatably connected to the fixing nut 10. The screw 7 is threadedly connected to the same live nut 12. A push rod piston 9 is fixed on the live nut 12. The front end of the push rod piston 9 is used to press against the hollow package stress gauge. The electric actuator also includes a brake 11.

[0048] The adjusting rod 18 is an electric adjusting rod, and there are three of them, which are evenly distributed in a ring on the inner wall of the device body. One of them is located at the bottom of the inner wall of the device body to support the balance support cylinder, and the other two are arranged on both sides as auxiliary adjusting rods 19.

[0049] The present invention also provides a method for using the above-mentioned automatic installation device for hollow inclusion stress gauges that facilitates in-situ stress testing, comprising the following steps:

[0050] Step 1: Drill a guide hole at the location where the ground stress test is to be conducted, and then drill a test hole concentrically for installing the hollow infill stress gauge. After drilling is completed, perform hole cleaning.

[0051] Step 2: Inject epoxy resin into the cavity of the hollow package and the epoxy resin cylinder 20, keep the strain gauge A 21 of the hollow package stress gauge vertically upward and place it in the second support cylinder 3 of the balance support cylinder, and let the cable pass out from the opening at the rear end.

[0052] Step 3: Place the device body in the guide hole, and stop advancing after the device body reaches the designated position. With the assistance of the balance support, ensure that the A strain gauge 21 of the hollow package stress gauge is always vertically upward.

[0053] Step 4: Use controller 15 to control the stroke control device 13 to work and fix the position of the device body;

[0054] Step 5: Observe the alignment of the hollow inclusion stress gauge with the hole on the monitor, and use the controller 15 to control the adjusting rod 18 to fine-tune the alignment of the guide head 23 of the hollow inclusion stress gauge with the test borehole.

[0055] Step 6: Use controller 15 to control the electric actuator to send the hollow inclusion stress gauge into the test hole, and wait for the epoxy resin to cure.

[0056] Step 7: After curing, observe the installation status of the hollow body stress gauge on the monitor, control the retractable top rod of the stroke control device 13 to retract, control the retraction of the device body, so that the device body and cable device are withdrawn from the guide hole, and then drill deeper in the guide hole and carry out subsequent stress relief work.

[0057] This device features a counterweight at the bottom of the balance support to ensure that strain gauge A is vertically upward during installation of the hollow inclusion stress gauge, while also preventing plunger 22 from dislodging as the hollow inclusion stress gauge advances within the guide hole. A stroke control device limits the displacement of the device body after reaching a designated position. A high-definition camera provides images for the user to observe the hole alignment accuracy, enabling visualized installation. The installation process is completed by pushing the hollow inclusion stress gauge using an electric actuator. This invention is applied to the automatic installation of hollow inclusion stress gauges, offering a simple and highly automated installation process with no limitation on test borehole depth. The installation results in precise strain gauge positioning, which is of great significance for stress measurement in mines.

[0058] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An automatic installation device for hollow inclusion stress gauges to facilitate in-situ stress testing, characterized in that: The device includes a mobile walking device body, which is provided with a balance support for placing a hollow inclusion stress gauge, several adjusting rods (18) for adjusting the position of the balance support in the hole, a camera device for visualizing the hollow inclusion stress gauge in the hole, and an electric push rod device for pushing the hollow inclusion stress gauge into the test borehole. The balance support includes a first support (1) and a second support (3) located inside the first support (1) and supported and rotated by a balance wheel (2). The lower part of the second support (3) is provided with a counterweight (5) to keep the A strain gauge (21) of the hollow package stress gauge inside the second support (3) vertically upward. The adjusting rod (18) is arranged in a ring at the front end of the balance support. The adjusting rod (18) is electrically connected to the controller (15) for use in assisting in fixing and adjusting the horizontal and vertical position of the balance support, so as to realize that the hollow package stress gauge and the test borehole are concentric. The electric push rod device is located behind the balance support and is electrically connected to the controller (15). The controller (15) controls the push rod piston (9) of the electric push rod device to extend and press against the hollow package stress gauge, and push it into the test borehole. The device body adopts a cylindrical shell. The device body is provided with an axial propulsion device. The axial propulsion device includes a drive wheel set (16) and a guide wheel (14) respectively located at the front and rear ends of the device body. The balance support, stroke control device (13), and electric push rod device are all located inside the cylindrical shell. The camera device includes several high-definition cameras (4) located in front of the balance support cylinder. The high-definition cameras (4) are electrically connected to the controller (15) and displayed on the monitor to realize the visualization of the hole alignment of the hollow package stress gauge and improve the hole alignment accuracy. It also includes a stroke control device (13) of an electrical connection controller (15). The stroke control device (13) includes several sets of telescopic push rods, which are placed around the rear of the device body. After the device body reaches the designated position, the telescopic push rods extend and press against the wall around the guide hole to fix the device body.

2. The automatic installation device for hollow inclusion stress gauges for facilitating ground stress testing as described in claim 1, characterized in that: The electric actuator includes a frame fixed to the main body of the device. The front end of the frame is provided with a fixing nut (10), and the rear end of the frame is provided with a push rod motor (8). The output end of the push rod motor (8) is connected to several screws (7) through a gear set (6) in the gearbox and can control its forward and reverse rotation. The front end of the screw (7) is rotatably connected to the fixing nut (10). The screw (7) is threadedly connected to the same live nut (12). The push rod piston (9) is fixed on the live nut (12). The front end of the push rod piston (9) is used to press against the hollow package stress gauge.

3. The automatic installation device for hollow inclusion stress gauges for facilitating ground stress testing as described in claim 2, characterized in that: The adjusting rod (18) is an electric adjusting rod. There are three of them, which are evenly distributed in a ring on the inner wall of the device body. One of them is located at the bottom of the inner wall of the device body to support the balance support cylinder. The other two are arranged on both sides as auxiliary adjusting rods (19).

4. A method of using the automatic installation device for a hollow inclusion stress gauge for facilitating ground stress testing as described in claim 3, characterized in that, Includes the following steps: Step 1: Drill a guide hole at the location where the ground stress test is to be conducted, and then drill a test hole concentrically for installing the hollow infill stress gauge. After drilling is completed, perform hole cleaning. Step 2: Inject epoxy resin into the cavity of the hollow package, keep the A strain gauge (21) of the hollow package stress gauge vertically upward and place it in the second support (3) of the balance support, and let the cable pass through the opening at the rear end; Step 3: Place the device body in the guide hole, control the device body to stop advancing after reaching the designated position, and with the assistance of the balance support, ensure that the A strain gauge (21) of the hollow cladding stress gauge is always vertically upward; Step 4: Use the controller (15) to control the stroke control device (13) to work and fix the position of the device body; Step 5: Observe the hole alignment of the hollow inclusion stress gauge on the monitor, and finely adjust the adjusting rod (18) through the controller (15) to align the guide head (23) of the hollow inclusion stress gauge with the test borehole; Step 6: Use the controller (15) to control the electric actuator to send the hollow package stress gauge into the test hole, and wait for the epoxy resin to cure. Step 7: After curing, observe the installation status of the hollow body stress gauge on the monitor, control the retractable top rod of the stroke control device (13) to retract, control the retraction of the device body, so that the device body and cable device are withdrawn from the guide hole, and then drill deeper in the guide hole and carry out subsequent stress relief work.

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