Test device for mechanical properties of anchor bolt

Abstract

The present application relates to the technical field of testing of mechanical properties of anchor bolts. Provided is a test device for mechanical properties of an anchor bolt. The test device comprises a pressure-bearing cylinder, a confining pressure loading system, a temperature control system, and an axial creep loading system, wherein a bolt body sample is suspended in the pressure-bearing cylinder, a bolt of the bolt body sample extends from the pressure-bearing cylinder and is connected to the axial creep loading system, and an axial creep pressure is applied to the bolt body sample by means of the axial creep loading system, so as to simulate a creep time effect during pulling the bolt; the confining pressure loading system is in communication with the pressure-bearing cylinder, and a radial pressure and a bottom pressure are applied to the bolt body sample in the pressure-bearing cylinder by means of the confining pressure loading system, so as to simulate a static stress field of the bolt body; and the temperature control system adjusts the temperature required for the test of the bolt body sample, so as to simulate an occurrence temperature environment of the bolt body body. By means of the combined action of the devices, mechanical properties of the bolt body sample under different temperature environments are tested.

Description

Anchor bolt mechanical property testing device

[0001] Cross-references to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202411555313.3, filed on November 4, 2024, the contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of mechanical property testing technology for anchor bolts, specifically to a testing device for the mechanical properties of anchor bolts. Background Technology

[0004] To ensure the safe and stable excavation of rock mass engineering in mines, rock bolt support is widely used due to its high efficiency, simplicity, and economy. When using rock bolt support in jointed rock masses, the tangential rock bolts at the joint surfaces act as shear inhibitors, preventing the surrounding rock from shifting. Relying on the force transmission between the anchoring interfaces, the rock bolts can suppress deformation of the surrounding rock in the axial direction and improve its condition. Due to its inherent mineral properties, rock masses exhibit more pronounced creep characteristics than intact hard rock. Over time, creep damage accumulates, causing the anchor body to gradually break and weaken, resulting in a decrease in integrity. When its bearing capacity decreases to its limit, it will lead to instability of the anchor body. With the increasing prevalence of deep underground mining and high-altitude open-pit mining, the on-site temperature environment for rock bolt support applications spans a wide range, but the influence of temperature on the anchoring effect of rock bolts remains unclear. Therefore, there is an urgent need for a new type of testing device for the mechanical properties of anchor bolts to detect the mechanical properties of anchor bolts under different temperature conditions. Summary of the Invention

[0005] In view of the technical problems existing in the background art, this application provides a test device for the mechanical properties of anchor bolts. The test device for the mechanical properties of anchor bolts achieves the technical effect of testing the mechanical properties of anchor bolt samples under different temperature environments through the combined action of a temperature control system, a confining pressure load loading system and an axial creep load loading system.

[0006] This application provides a testing device for the mechanical properties of anchored bolts. The device tests the mechanical properties of the anchored bolts using an anchor bolt body sample. The anchor bolt body sample includes a rock-like matrix and an anchor bolt. An anchoring hole is formed at the top of the rock-like matrix, and the anchor bolt is placed inside the anchoring hole and anchored to the rock-like matrix using an anchoring agent. The device is characterized by comprising:

[0007] The pressure-bearing cylinder has a sealed cavity inside, and the anchor rod sample is suspended in the cavity. The top of the pressure-bearing cylinder has a first through hole, through which the anchor rod of the anchor rod sample extends out of the pressure-bearing cylinder.

[0008] The confining pressure load loading system is connected to the pressure-bearing cylinder and is used to deliver the solution into the cavity and regulate the pressure of the solution.

[0009] A flexible water-proof component is wrapped around the rock-like matrix of the anchor bolt sample to isolate the rock-like matrix from the solution.

[0010] A temperature control system, connected to the pressure vessel, is used to regulate the temperature of the solution;

[0011] An axial creep load loading system is installed on the pressure cylinder and connected to the anchor bolt. The axial creep load loading system is used to apply axial creep load to the anchor bolt.

[0012] In the technical solution of this application embodiment, an axial creep load loading system is used to apply axial creep pressure to the anchor body sample to simulate the creep time effect during the anchor pull-out process; a confining pressure load loading system is used to apply radial pressure and bottom pressure to the anchor body sample inside the pressure cylinder to simulate the static stress field of the anchor body; and a temperature control system is used to adjust the temperature required for the anchor body sample test to simulate the storage temperature environment of the anchor body; therefore, under the combined action of the temperature control system, the confining pressure load loading system, and the axial creep load loading system, the mechanical properties of the anchor body sample under different temperature environments can be detected.

[0013] In some embodiments, the anchor bolt mechanical property testing device further includes an anchor bolt temperature detection device; one end of the anchor bolt extending out of the pressure-bearing cylinder is provided with an opening, which extends along the axial direction of the anchor bolt towards the end of the anchor bolt placed inside the pressure-bearing cylinder, and the anchor bolt temperature detection device penetrates into the anchor bolt through the opening to detect the temperature of the anchor bolt body sample.

[0014] In this embodiment, the actual temperature of the anchor rod sample is detected in real time by an anchor rod temperature detection device installed inside the anchor rod sample. This allows for a more accurate simulation of the ambient temperature of the anchor rod during actual use, further improving the accuracy of the anchor rod mechanical property testing device when testing the mechanical properties of the anchor rod.

[0015] In some embodiments, the anchor bolt mechanical property testing device further includes an insulated box, and a pressure cylinder is disposed inside the insulated box.

[0016] In this embodiment, by placing the pressure-bearing cylinder inside the heat-insulating chamber, the heat loss of the pressure-bearing cylinder can be reduced during the test, so that the anchor solid sample can always be maintained at the predetermined temperature, thereby ensuring the accuracy and reliability of the experimental data.

[0017] In some embodiments, the temperature control system is also connected to the insulation box for regulating the temperature inside the insulation box.

[0018] In this embodiment, the temperature inside the insulation box is adjusted by a temperature control system so that the temperature inside the insulation box can be kept in balance with the temperature of the solution inside the pressure vessel.

[0019] In some embodiments, the temperature control system includes a heat exchanger, a heat conduit for hot and cold media, a drive motor, and a heat conduit for hot and cold media. One end of the heat conduit for hot and cold media is connected to the heat exchanger for hot and cold media, and the other end extends into the cavity. The heat conduit for hot and cold media is placed in the heat conduit for hot and cold media, and the drive motor drives the heat conduit for hot and cold media to flow in the heat conduit for hot and cold media.

[0020] In this embodiment, by heating or cooling the circulating hot and cold medium through a heat exchanger, the temperature of the solution inside the pressure vessel can be controlled more precisely, and the temperature of the solution inside the pressure vessel can be adjusted as needed, thereby achieving the effect of simulating both high-temperature and low-temperature environments simultaneously.

[0021] In some embodiments, the solution in the pressure vessel may be antifreeze.

[0022] In this embodiment, by using antifreeze as the hydraulic solution in the pressure vessel, the anchor bolt mechanical property test device can simulate the ambient temperature of cold regions, thus making it easier to study the mechanical properties and influence mechanism of anchor bolts under the combined action of axial force and confining pressure under different temperature environments.

[0023] In some embodiments, the hot and cold exchanger is provided with one or more sets of hot and cold medium conduits, which extend from the bottom end of the pressure cylinder into the cavity and extend toward the top end of the pressure cylinder.

[0024] In this embodiment, the hot and cold medium conduit extending towards the top of the pressure vessel enables the temperature control system to heat or cool the solution in the pressure vessel more evenly.

[0025] In some embodiments, the axial creep load loading system includes a pressure load sensor, a hydraulic loading device, a laser rangefinder, and an anchor bolt lock. The hydraulic loading device is disposed on the top of the pressure-bearing cylinder and connected to the anchor bolt via the anchor bolt lock. The hydraulic loading device is used to continuously apply axial load to the anchor bolt. The pressure load sensor is disposed between the hydraulic loading device and the pressure-bearing cylinder to detect the axial load applied to the anchor bolt by the hydraulic loading device. The laser rangefinder is disposed on the pressure-bearing cylinder to monitor the displacement of the hydraulic loading device.

[0026] In this embodiment, the anchor bolt is fixed to the hydraulic loading device by an anchor bolt locking device. By pumping hydraulic oil into the hydraulic loading device, the hydraulic loading device can continuously apply a creep pull-out load to the anchor bolt. During the process of the hydraulic loading device applying load to the anchor bolt, a pressure load sensor measures the creep pull-out load applied by the hydraulic loading device to the anchor bolt, and a laser rangefinder monitors the displacement information of the hydraulic loading device. Finally, the mechanical characteristics of the anchor bolt can be clearly analyzed by combining the creep pull-out load and the displacement information of the hydraulic loading device.

[0027] In some embodiments, the anchor bolt mechanical property testing device further includes a shim, which has a hemispherical structure and is disposed at the bottom end of the anchor bolt body sample.

[0028] In this embodiment, the hemispherical structure of the gasket makes the bottom of the anchor solid sample more uniformly stressed.

[0029] In some embodiments, the flexible waterproofing element is a heat shrink tubing.

[0030] In this embodiment, the flexible waterproofing element can be heated to tightly wrap the anchor rod sample, greatly reducing the difficulty of using the anchor rod mechanical property testing device.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 is a schematic diagram of the structure of the test device for the mechanical properties of anchor bolts in the embodiments of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Anchor bolt sample; 11. Rock-like matrix; 12. Anchor bolt; 13. Anchoring agent; 2. Pressure-bearing cylinder; 21. Cavity; 3. Confining pressure load loading system; 4. Flexible waterproof component; 5. Temperature control system; 51. Heat exchanger; 52. Heat and cold medium conduit; 53. Drive motor; 6. Axial creep load loading system; 61. Pressure load sensor; 62. Hydraulic loading device; 63. Laser rangefinder; 64. Anchor bolt lock; 7. Anchor bolt temperature detection device; 8. Insulation box; 9. Gasket. Detailed Implementation

[0035] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0041] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0043] To ensure the safe and stable excavation of rock mass engineering in mines, rock bolt support is widely used due to its high efficiency, simplicity, and economy. When using rock bolt support in jointed rock masses, the tangential rock bolts at the joint surfaces act as shear arrestors, preventing the surrounding rock from shifting. Relying on the force transmission between the anchoring interfaces, the rock bolts can suppress deformation of the surrounding rock in the axial direction and improve its condition. Due to its inherent mineral properties, rock masses exhibit more pronounced creep characteristics than intact hard rock. Over time, creep damage accumulates, causing the anchor body to gradually break and weaken, resulting in a decrease in integrity. When its bearing capacity decreases to its limit, it will lead to instability of the anchor body. With the increasing prevalence of deep underground mining and high-altitude open-pit mining, the on-site temperature environment for rock bolt support applications spans a wide range, but the impact of temperature on the anchoring effect of rock bolts remains unclear.

[0044] To address the technical problem of how to test the mechanical properties of anchor bolts under different temperature environments using a novel anchor bolt mechanical property testing device, this application provides an anchor bolt mechanical property testing device. This device achieves the technical effect of testing the mechanical properties of anchor bolt samples under different temperature environments through the combined action of a temperature control system, a confining pressure load loading system, and an axial creep load loading system.

[0045] Figure 1 is a schematic diagram of the structure of the test device for the mechanical properties of anchor bolts provided in the embodiment of this application.

[0046] In the process of testing the mechanical properties of anchor bolts, the anchor bolt to be tested is made into an anchor bolt body sample 1. The mechanical properties of the anchor bolt to be tested are tested through the anchor bolt body sample 1. The anchor bolt body sample 1 mainly includes a rock-like matrix 11 and an anchor bolt 12. An anchoring hole is opened at the top of the rock-like matrix 11, the anchor is placed in the anchoring hole, and is anchored and bonded to the rock-like matrix 11 by an anchoring agent 13. During the testing process, the anchor bolt body sample 1 is placed in the anchor bolt mechanical property testing device disclosed in this application, and the mechanical properties of the anchor bolt body sample 1 are tested by the anchor bolt mechanical property testing device, thereby obtaining the mechanical properties of the anchor bolt.

[0047] In this embodiment, the anchor bolt mechanical property testing device includes a pressure-bearing cylinder 2, a confining pressure load loading system 3, a flexible water-tight component 4, a temperature control system 5, and an axial creep load loading system 6. The pressure-bearing cylinder 2 has a sealed cavity 21, and the anchor bolt sample 1 is suspended inside the cavity 21. A first through hole is opened at the top of the pressure-bearing cylinder 2, through which the anchor bolt 12 of the anchor bolt sample 1 extends out of the pressure-bearing cylinder 2. The confining pressure load loading system 3 is connected to the pressure-bearing cylinder 2 and is used to deliver a solution into the cavity 21 and adjust the pressure of the solution to test the anchor bolt sample 1. Pressure is applied simultaneously to the sidewalls and bottom, thus more closely mimicking the actual stress state of the anchor body. A flexible water-tight component 4 is wrapped around the surrounding rock matrix 11 of the anchor rod sample 1, isolating the matrix 11 from the solution and preventing the solution from seeping into the matrix 11 and affecting the mechanical properties of the anchor rod. A temperature control system 5 is connected to the pressure cylinder 2 to regulate the solution temperature. An axial creep load system 6 is mounted on the pressure cylinder 2 and connected to the anchor rod 12, applying an axial creep load to the anchor rod 12. Therefore, in actual use, the combined action of the temperature control system 5, the confining pressure load system 3, and the axial creep load system 6 enables the testing of the mechanical properties of the anchor rod sample 1 under different temperature environments.

[0048] In this embodiment, an axial creep load loading system 6 applies axial creep pressure to the anchor body sample to simulate the creep time effect during the pull-out process of the anchor rod 12; a confining pressure load loading system 3 applies radial pressure and bottom pressure to the anchor body sample inside the pressure cylinder to simulate the static stress field of the anchor body; a temperature control system 5 adjusts the temperature required for the anchor body sample test to simulate the storage temperature environment of the anchor body; during the experiment, the effects of ambient temperature changes, stress field around the anchor body, and creep time effect on the anchoring performance of the anchor rod 12 are considered simultaneously, greatly improving the accuracy of the detection of the mechanical properties of the anchor rod.

[0049] In this embodiment, the anchor bolt mechanical property testing device includes an anchor bolt temperature detection device 7. One end of the anchor bolt 12 extending out of the pressure-bearing cylinder 2 has an opening that extends towards the end of the anchor bolt 12 placed inside the pressure-bearing cylinder 2. The anchor bolt temperature detection device 7 extends into the anchor bolt 12 through the opening to detect the temperature of the anchor bolt body sample 1. During use, the temperature control system 5 adjusts the temperature of the solution inside the pressure-bearing cylinder 2, thereby controlling the temperature environment of the anchor bolt body sample 1. In this embodiment, the anchor bolt temperature detection device 7 installed inside the anchor bolt body sample 1 detects the actual temperature of the anchor bolt body sample 1 in real time, enabling more accurate simulation of the ambient temperature during actual use of the anchor bolt, further improving the accuracy of the anchor bolt mechanical property testing device in testing the mechanical properties of the anchor bolt.

[0050] In this embodiment, the anchor bolt mechanical property testing device also includes an insulated box 8, and a pressure cylinder 2 is placed inside the insulated box 8. The insulated box 8 isolates the temperature inside the box from the outside environment through its heat insulation performance, thereby ensuring that the anchor bolt sample can always be kept at a predetermined temperature during the test, further guaranteeing the accuracy and reliability of the experimental data.

[0051] In this embodiment, the temperature control system 5 is also connected to the insulation box 8. The temperature inside the insulation box 8 is adjusted by the temperature control system 5 so that the temperature inside the insulation box 8 is balanced with the temperature of the solution inside the pressure vessel 2, thereby further ensuring the accuracy and reliability of the experimental data.

[0052] In this embodiment, the temperature control system 5 includes a heat exchanger 51, a heat transfer medium conduit 52, a drive motor 53, and a heat transfer medium. One end of the heat transfer medium conduit 52 is connected to the heat exchanger 51, and the other end extends into the cavity 21. The heat transfer medium is placed in the heat transfer medium conduit 52, and the heat transfer medium is driven to flow in the heat transfer medium conduit 52 by the drive motor 53. By connecting the heat exchanger 51, the drive motor 53, and the heat transfer medium conduit 52 in series, a heat exchange cycle is formed to achieve the control of the solution temperature in the pressure cylinder 2.

[0053] Secondly, compared with traditional electric heating devices, in this embodiment, the circulating hot and cold medium is heated or cooled by the heat exchanger 51, which not only allows for more precise control of the temperature of the solution in the pressure cylinder 2, but also allows for adjustment of the temperature of the solution in the pressure cylinder 2 as needed, thereby achieving the effect of simultaneously simulating high-temperature and low-temperature environments.

[0054] Based on this, in this embodiment, the solution can be antifreeze, which is a solution that can remain liquid in a low-temperature environment. By using antifreeze as the hydraulic solution in the pressure cylinder 2, the anchoring bolt mechanical property test device can simulate the environmental temperature of cold regions, which makes it easier to study the mechanical properties and influence mechanism of anchoring bolts under the combined action of axial and confining pressure under different temperature environments.

[0055] In this embodiment, the heat exchanger 51 is provided with one or more sets of heat exchange medium conduits 52. The heat exchange medium conduits 52 extend from the bottom end of the pressure cylinder 2 into the cavity 21 and extend towards the top end of the pressure cylinder 2, so that the temperature control system 5 can heat or cool the solution in the pressure cylinder 2 more evenly.

[0056] In this embodiment, the axial creep load loading system 6 includes a pressure load sensor 61, a hydraulic loading device 62, a laser rangefinder 63, and an anchor bolt lock 64. The hydraulic loading device 62 is disposed on the top of the pressure-bearing cylinder 2 and connected to the anchor bolt 12 through the anchor bolt lock 64. The hydraulic loading device 62 is used to continuously apply axial load to the anchor bolt 12. The pressure load sensor 61 is disposed between the hydraulic loading device 62 and the pressure-bearing cylinder 2 and is used to detect the axial load applied by the hydraulic loading device 62 to the anchor bolt 12. The laser rangefinder 63 is disposed on the pressure-bearing cylinder 2 and is used to monitor the displacement of the hydraulic loading device 62.

[0057] During use, the anchor bolt 12 is fixed to the hydraulic loading device 62 by the anchor bolt locking device 64. By pumping hydraulic oil into the hydraulic loading device 62, the hydraulic loading device 62 can continuously apply creep pull-out load to the anchor bolt 12. During the process of the hydraulic loading device 62 applying load to the anchor bolt 12, the creep pull-out load applied by the hydraulic loading device 62 to the anchor bolt 12 is measured by the pressure load sensor 61, and the displacement information of the hydraulic loading device 62 is monitored by the laser rangefinder 63. Finally, the mechanical characteristics of the anchor bolt can be clearly analyzed by the creep pull-out load and the displacement information of the hydraulic loading device 62.

[0058] In this embodiment, the anchor rod mechanical property testing device also includes a shim 9, which has a hemispherical structure and is placed at the bottom of the anchor rod body sample 1. The hemispherical structure of the shim 9 makes the bottom of the anchor rod body sample more uniformly stressed.

[0059] In this embodiment, the flexible waterproofing element 4 is a heat shrink tubing. Using heat shrink tubing as the flexible waterproofing element 4 not only has the characteristics of insulation, corrosion resistance, and wear resistance, but also, when the flexible waterproofing element 4 is fitted onto the anchor rod body sample 1, heating the flexible waterproofing element 4 can tightly wrap the anchor rod body sample 1, which greatly reduces the difficulty of using the anchor rod mechanical property testing device.

[0060] The specific usage method is as follows:

[0061] Step 1: Prepare anchor body sample; cast a pre-reserved anchor hole in the surrounding rock matrix 11 using a specific mold, and pre-embed a temperature sensor in the groove of a certain length on the anchor rod 12. After the surrounding rock matrix 11 is successfully cured, insert the anchor rod 12 vertically into the pre-reserved anchor hole in the center, and fill the gap in the pre-reserved anchor hole with anchoring agent. After a certain period of curing, obtain the anchor body sample.

[0062] Step 2: Place the hemispherical pad at the bottom of the anchor solid sample, and use the flexible water-proof component 4 to fit the hemispherical pad, the anchor solid sample, and the sealing pad together. Use a hot air gun to heat the flexible water-proof component 4 to make them fit tightly.

[0063] Step 3: Place the anchor body sample in the cavity 21 inside the pressure-bearing cylinder 2, suspend the anchor body sample at the top of the pressure-bearing cylinder 2, and make the anchor rod 12 of the anchor body sample extend through the first through hole on the pressure-bearing cylinder 2.

[0064] Step 4: The anchor bolt 12 extending from the pressure-bearing cylinder 2 passes through the hydraulic loading device 62 and is fixedly connected to the hydraulic loading device 62 through the anchor bolt lock 64;

[0065] Step 5: Control the confining pressure load loading system 3 to continuously inject antifreeze into the pressure cylinder 2 until the pressure cylinder 2 is completely filled with antifreeze;

[0066] Step 6: Turn on the heat exchanger 51 and drive motor 53, adjust the temperature of the heat exchange medium in the heat exchange medium conduit 52, raise / lower the temperature inside and outside the pressure cylinder 2 by the heat exchange medium conduit 52 arranged in the inner cavity of the pressure cylinder and the heat preservation box 8, monitor the temperature of the anchor solid sample in real time by the temperature sensor, and when the temperature of the anchor solid sample reaches the predetermined temperature value required for the test, keep the temperature of the anchor solid sample at the predetermined temperature value by controlling the heat exchanger 51 and drive motor 53.

[0067] Step 7: Set the required confining pressure load for the test, control the confining pressure load loading system 3 to adjust the hydraulic pressure of the solution in the pressure cylinder 2, and then apply radial confining pressure and bottom pressure to the anchor solid sample through the antifreeze. When the confining pressure load reaches the predetermined value required for the test, stop pressurizing through the confining pressure load loading system 3 and keep the confining pressure constant.

[0068] Step 8: By pumping hydraulic oil into the hydraulic loading device 62, the hydraulic loading device 62 can continuously apply creep pull-out load to the anchor rod 12. The applied pull-out load is measured by the pressure load sensor 61, and the displacement of the anchor rod 12 during the pull-out process is measured by the laser rangefinder 63. Finally, the mechanical characteristics of the anchor rod can be clearly analyzed by the creep pull-out load and the displacement information of the hydraulic loading device 62.

[0069] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A test device for the mechanical properties of anchor bolts, wherein the mechanical properties of anchor bolts are tested using an anchor bolt body sample (1), the anchor bolt body sample (1) comprising a rock-like matrix (11) and an anchor bolt (12), an anchoring hole is provided at the top of the rock-like matrix (11), the anchor bolt (12) is placed in the anchoring hole and anchored and bonded to the rock-like matrix (11) by an anchoring agent (13), characterized in that, The anchor bolt mechanical property testing device includes: The pressure-bearing cylinder (2) has a sealed cavity (21) inside, the anchor rod body sample (1) is suspended in the cavity (21), the top of the pressure-bearing cylinder (2) has a first through hole, and the anchor rod (12) of the anchor rod body sample (1) extends out of the pressure-bearing cylinder (2) through the first through hole. A confining pressure load loading system (3) is connected to the pressure-bearing cylinder (2) and is used to deliver a solution into the cavity (21) and adjust the pressure of the solution. A flexible water-proof component (4) is wrapped around the rock-like matrix (11) of the anchor body sample (1) to isolate the rock-like matrix (11) from the solution. A temperature control system (5) is connected to the pressure cylinder (2) and is used to regulate the temperature of the solution; An axial creep load loading system (6) is provided on the pressure cylinder (2) and connected to the anchor rod (12). The axial creep load loading system (6) is used to apply an axial creep load to the anchor rod (12). The temperature control system (5) includes a heat exchanger (51), a heat transfer medium conduit (52), a drive motor (53), and a heat transfer medium. One end of the heat transfer medium conduit (52) is connected to the heat exchanger (51), and the other end extends into the cavity (21). The heat transfer medium is placed in the heat transfer medium conduit (52), and the heat transfer medium is driven to flow in the heat transfer medium conduit (52) by the drive motor (53). The solution is antifreeze.

2. The test device for the mechanical properties of anchor bolts according to claim 1, characterized in that, It also includes an anchor rod temperature detection device; the end of the anchor rod (12) extending out of the pressure-bearing cylinder (2) is provided with an opening, the opening extends along the axial direction of the anchor rod (12) toward the end of the anchor rod (12) placed in the pressure-bearing cylinder (2), and the anchor rod temperature detection device penetrates into the anchor rod (12) through the opening to detect the temperature of the anchor rod body sample (1).

3. The test device for the mechanical properties of anchor bolts according to claim 1, characterized in that, It also includes an insulation box (8), and the pressure cylinder (2) is disposed inside the insulation box (8).

4. The test device for the mechanical properties of anchor bolts according to claim 3, characterized in that, The temperature control system (5) is also connected to the insulation box (8) for adjusting the temperature inside the insulation box (8).

5. The test device for the mechanical properties of anchor bolts according to claim 1, characterized in that, The hot and cold exchanger (51) is provided with one or more sets of hot and cold medium conduits (52), which extend from the bottom end of the pressure cylinder (2) into the cavity (21) and extend towards the top end of the pressure cylinder (2).

6. The test device for the mechanical properties of anchor bolts according to claim 1, characterized in that, The axial creep load loading system (6) includes a pressure load sensor (61), a hydraulic loading device (62), a laser rangefinder (63), and an anchor bolt lock (64). The hydraulic loading device (62) is located on the top of the pressure-bearing cylinder (2) and connected to the anchor bolt (12) through the anchor bolt lock (64). The hydraulic loading device (62) is used to continuously apply an axial load to the anchor bolt (12). The pressure load sensor (61) is located between the hydraulic loading device (62) and the pressure-bearing cylinder (2) and is used to detect the axial load applied to the anchor bolt (12) by the hydraulic loading device (62). The laser rangefinder (63) is located on the pressure-bearing cylinder (2) and is used to monitor the displacement of the hydraulic loading device (62).

7. The test device for the mechanical properties of anchor bolts according to claim 1, characterized in that, It also includes a gasket (9), which has a hemispherical structure and is disposed at the bottom end of the anchor body sample (1).

8. The test device for the mechanical properties of anchor bolts according to claim 1, characterized in that, The flexible waterproof component (4) is a heat shrink tubing.

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