A concrete high-temperature strain measurement device, system and method

Abstract

The application discloses a kind of concrete high-temperature strain measuring device, system and method, including support, further including the measuring device of installation on support;Support includes upper horizontal support, lower horizontal support and vertical support, measuring device includes the upper sliding sleeve and lower sliding sleeve of sleeve joint on vertical support, first probe rod and second probe rod are respectively installed on upper sliding sleeve and lower sliding sleeve;First probe rod one end is connected with upper sliding sleeve, other end is provided with recess, second probe rod one end is connected with lower sliding sleeve, other end is provided with recess;Radial displacement sensor is installed on upper horizontal support or lower horizontal support, axial displacement sensor is installed on upper sliding sleeve or lower sliding sleeve;The application can measure the axial displacement and transverse displacement of concrete test block by first probe rod and second probe rod leading out high-temperature furnace, realize the strain measurement of test piece under high temperature, to avoid the influence of high-temperature environment on instrument.

Description

Technical Field

[0001] This invention relates to the field of high-temperature strain testing technology, specifically to a device, system, and method for measuring high-temperature strain in concrete. Background Technology

[0002] In recent years, various new types of concrete have been invented and promoted due to their excellent performance, such as recycled aggregate concrete and fiber-reinforced concrete. Before their widespread use, in-depth research into their various properties is essential. Currently, suitable equipment and instruments exist to ensure the effective acquisition of experimental parameters for the mechanical properties, durability, and microstructure of concrete at room temperature. However, with the increasing density, large scale, and comprehensive nature of construction in my country, fires pose a significant threat to personal safety and property. Therefore, researching the high-temperature performance of concrete is of paramount importance. Currently, there are few significant achievements in the high-temperature field. Most scholars have studied the various properties of concrete at high temperatures, but these properties can only provide data references for post-fire structural assessment and reinforcement, and cannot replace the structural performance under fire conditions. The reason for this is the difficulty in effectively acquiring experimental data at high temperatures.

[0003] When testing the mechanical properties of concrete at high temperatures, the strain of the concrete inside the furnace cannot be accurately measured using conventional methods due to the extremely high temperatures inside the furnace and on the test specimens. If the high-temperature test specimens are removed for testing after the heating time has elapsed, the accuracy of the results will be affected by heat loss and changes in the environment, and there are also certain safety hazards involved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a concrete high-temperature strain measurement device, system, and method, solving the problem that conventional devices in the prior art cannot accurately measure the strain of concrete in high-temperature furnaces.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a concrete high-temperature strain measuring device, including a support and a measuring device installed on the support;

[0006] The support includes an upper horizontal support, a lower horizontal support, and a vertical support installed between the upper horizontal support and the lower horizontal support. The vertical support is capable of moving along the length of the upper horizontal support.

[0007] The measuring device includes an upper sliding sleeve and a lower sliding sleeve fitted onto a vertical support, and a first probe and a second probe are respectively installed on the upper sliding sleeve and the lower sliding sleeve.

[0008] The first probe is connected to the upper sliding sleeve at one end and has a groove at the other end; the second probe is connected to the lower sliding sleeve at one end and has a groove at the other end.

[0009] A radial displacement sensor is installed on the upper or lower horizontal support, and an axial displacement sensor is installed on the upper or lower sliding sleeve.

[0010] The radial displacement sensor is used to measure the movement distance of the vertical support along the upper horizontal support; the axial displacement sensor is used to measure the movement distance of the upper sliding sleeve relative to the lower sliding sleeve.

[0011] The present invention also has the following technical features:

[0012] The vertical support is connected to the upper horizontal support through a first vertical support sleeve fitted onto the upper horizontal support, and the vertical support is connected to the lower horizontal support through a second vertical support sleeve fitted onto the lower horizontal support.

[0013] The first vertical support sleeve can move along the upper horizontal support, and the second vertical support sleeve can move along the lower horizontal support.

[0014] The axial displacement sensor is fixed on the upper sliding sleeve, and the probe of the axial displacement sensor is in contact with the axial displacement gauge bracket installed on the lower sliding sleeve.

[0015] The radial displacement sensor is fixed on the lower horizontal support, and the probe of the radial displacement sensor is in contact with the radial displacement meter bracket installed on the second vertical support sleeve.

[0016] A horizontal angle sensor is installed on the first probe and the second probe respectively, and a vertical angle sensor is installed on the vertical bracket.

[0017] The first vertical support sleeve and the second vertical support sleeve are equipped with rollers inside, and the rollers can move along the upper horizontal support and the lower horizontal support.

[0018] The measuring device is also equipped with a cooling water system;

[0019] The cooling water system includes a cooling water housing installed on the outside of the upper sliding sleeve and the lower sliding sleeve, and the gap between the cooling water housing and the upper sliding sleeve or the lower sliding sleeve forms a first cooling water channel;

[0020] The cooling water system further includes a second cooling water channel arranged within the first and second probes;

[0021] The second cooling water channel arranged inside the first probe is connected to the first cooling water channel formed between the cooling water shell and the upper sliding sleeve;

[0022] The second cooling water channel arranged inside the second probe is connected to the first cooling water channel formed between the cooling water housing and the lower sliding sleeve;

[0023] The cooling water housing has a cooling water inlet and a cooling water outlet, which are connected to a cold water circulation system.

[0024] The vertical support is provided with a first sliding groove and a second sliding groove along the axial direction on opposite sides, and a first constraint rod and a second constraint rod are respectively installed in the first sliding groove and the second sliding groove.

[0025] The first constraint rod is fixedly connected to the upper sliding sleeve, and the second constraint rod is fixedly connected to the lower sliding sleeve.

[0026] A high-temperature concrete strain measurement system includes the aforementioned high-temperature concrete strain measurement device, and further includes a high-temperature furnace and a pressure testing machine.

[0027] The high-temperature furnace has square openings at the top and bottom, allowing the pressure head of the pressure testing machine to pass through the openings and apply pressure to the specimen inside the high-temperature furnace.

[0028] The high-temperature furnace has openings on its side wall, through which the first probe and the second probe can extend into the high-temperature furnace.

[0029] A method for measuring high-temperature strain in concrete, implemented using the aforementioned high-temperature strain measurement system, includes the following steps:

[0030] Step 1: Place the concrete test block into the high-temperature furnace;

[0031] Step 2: Move the vertical support and adjust the positions of the upper and lower sliding sleeves so that the first probe and the second probe pass through the openings on the furnace wall of the high-temperature furnace and the grooves match the pre-embedded concrete parts on the concrete test block.

[0032] Step 3: Set the heating rate and holding time of the high-temperature furnace. After the holding time is completed, turn on the pressure testing machine and apply pressure to the concrete test block.

[0033] Step 4: The axial displacement sensor collects the distance change between the upper and lower sliding sleeves, and the radial displacement sensor collects the relative displacement of the vertical support.

[0034] Step 5: Combine the pressure data from the pressure testing machine to calculate the elastic modulus and Poisson's ratio of the concrete specimen, thus realizing the high-temperature strain measurement of concrete.

[0035] Compared with the prior art, the present invention has the following technical effects:

[0036] (I) The device of the present invention can lead out the axial displacement and lateral displacement of the concrete specimen through the first probe and the second probe to measure the high temperature furnace, thereby realizing the strain measurement of the specimen under high temperature and avoiding the influence of the high temperature environment on the instrument.

[0037] (II) The system of the present invention, with its measuring device and high-temperature furnace, combined with a pressure testing machine, can obtain more accurate mechanical property parameters measured at high temperatures, such as the elastic modulus of concrete, stress-strain relationship, and Poisson's ratio. It is simple and convenient to use and is beneficial for practical applications.

[0038] (III) The method of the present invention ensures that strain measurement of specimens at high temperatures can be achieved without any processing, and the test results are accurate and effective. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0040] Figure 2 This is a schematic diagram of the overall system structure of the present invention;

[0041] Figure 3 for Figure 2 A schematic cross-sectional view of the structure at point a.

[0042] Figure 4 for Figure 2 A schematic cross-sectional view of the structure at point b in the middle;

[0043] Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure at point c in the middle;

[0044] The meanings of the labels in the attached diagram are as follows:

[0045] 1-Support; 2-Measuring device; 3-Roller; 4-Cooling water system; 5-Second sliding groove; 6-First constraint rod; 7-Second constraint rod; 8-High temperature furnace; 9-Concrete test block; 10-Concrete embedded part;

[0046] 1-1 Upper horizontal support, 1-2 Lower horizontal support, 1-3 Vertical support, 1-4 First vertical support sleeve, 1-5 Second vertical support sleeve;

[0047] 2-1 Upper sliding sleeve, 2-2 Lower sliding sleeve, 2-3 First probe, 2-4 Second probe, 2-5 Groove, 2-6 Radial displacement sensor, 2-7 Axial displacement sensor, 2-8 Axial displacement meter bracket, 2-9 Radial displacement meter bracket, 2-10 Horizontal angle sensor, 2-11 Vertical angle sensor.

[0048] 4-0 Cooling water casing, 4-1 First cooling water passage, 4-2 Second cooling water passage, 4-3 Cooling water inlet, 4-4 Cooling water outlet;

[0049] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0050] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0051] The terms “upper,” “lower,” “front,” “rear,” “top,” and “bottom” used in this invention refer to orientations or positional relationships only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. “Inner” and “outer” refer to the inner and outer contours of the corresponding components, and the above terms should not be construed as limitations on the invention.

[0052] In this invention, unless otherwise stated, the terms "installation," "connection," "linking," 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] Unless otherwise specified, all components in this invention are components known in the prior art.

[0054] In this invention, high temperature refers to room temperature to 1000°C.

[0055] Example 1:

[0056] Following the above technical solutions, such as Figures 1-5 As shown, a high-temperature concrete strain measuring device includes a support 1 and a measuring device 2 mounted on the support 1.

[0057] The bracket 1 includes an upper horizontal bracket 1-1, a lower horizontal bracket 1-2, and a vertical bracket 1-3 installed between the upper horizontal bracket 1-1 and the lower horizontal bracket 1-2. The vertical bracket 1-3 is capable of moving along the length of the upper horizontal bracket 1-1.

[0058] The measuring device 2 includes an upper sliding sleeve 2-1 and a lower sliding sleeve 2-2 sleeved on a vertical support 1-3. A first probe 2-3 and a second probe 2-4 are respectively installed on the upper sliding sleeve 2-1 and the lower sliding sleeve 2-2.

[0059] The first probe 2-3 is connected to the upper sliding sleeve 2-1 at one end and has a groove 2-5 at the other end; the second probe 2-4 is connected to the lower sliding sleeve 2-2 at one end and has a groove 2-5 at the other end.

[0060] A radial displacement sensor 2-6 is installed on the upper horizontal support 1-1 or the lower horizontal support 1-2, and an axial displacement sensor 2-7 is installed on the upper sliding sleeve 2-1 or the lower sliding sleeve 2-2.

[0061] The radial displacement sensor 2-6 is used to measure the movement distance of the vertical support 1-3 along the upper horizontal support 1-1; the axial displacement sensor 2-7 is used to measure the movement distance of the upper sliding sleeve 2-1 relative to the lower sliding sleeve 2-2.

[0062] This device can lead the axial and lateral displacements of the concrete specimen 9 out of the high-temperature furnace 8 for measurement through the first probe 2-3 and the second probe 2-4, thereby realizing the strain measurement of the specimen at high temperature and avoiding the influence of the high temperature environment on the instrument.

[0063] As a preferred embodiment:

[0064] The vertical support 1-3 is connected to the upper horizontal support 1-1 through a first vertical support sleeve 1-4 sleeved on the upper horizontal support 1-1, and the vertical support 1-3 is connected to the lower horizontal support 1-2 through a second vertical support sleeve 1-5 sleeved on the lower horizontal support 1-2.

[0065] The first vertical support sleeve 1-4 can move along the upper horizontal support 1-1, and the second vertical support sleeve 1-5 can move along the lower horizontal support 1-2.

[0066] As a preferred embodiment:

[0067] The axial displacement sensor 2-7 is fixed on the upper sliding sleeve 2-1, and the probe of the axial displacement sensor 2-7 is in contact with the axial displacement gauge bracket 2-8 installed on the lower sliding sleeve 2-2.

[0068] The radial displacement sensor 2-6 is fixed on the lower horizontal support 1-2, and the probe of the radial displacement sensor 2-6 is in contact with the radial displacement meter support 2-9 installed on the second vertical support sleeve 1-5.

[0069] As a preferred embodiment:

[0070] A horizontal angle sensor 2-10 is installed on the first probe rod 2-3 and the second probe rod 2-4 respectively, and a vertical angle sensor 2-11 is installed on the vertical bracket 1-3;

[0071] The installation of horizontal angle sensor 2-10 and vertical angle sensor 2-11 can correct deviations caused by instrument assembly and elastic deformation.

[0072] As a preferred embodiment:

[0073] The first vertical support sleeve 1-4 and the second vertical support sleeve 1-5 are equipped with rollers 3, which can move along the upper horizontal support 1-1 and the lower horizontal support 1-2.

[0074] As a preferred embodiment:

[0075] The measuring device 2 is also equipped with a cooling water system 3;

[0076] The cooling water system 4 includes a cooling water housing 4-0 installed on the outside of the upper sliding sleeve 2-1 and the lower sliding sleeve 2-2. The gap between the cooling water housing 4-0 and the upper sliding sleeve 2-1 or the lower sliding sleeve 2-2 forms a first cooling water channel 4-1. Figure 1 The mid-section is used to show the positional relationship between the upper sliding sleeve 2-1, the lower sliding sleeve 2-2, and the cooling water housing 4-0;

[0077] The cooling water system 4 further includes a second cooling water channel 4-2 arranged within the first probe 2-3 and the second probe 2-4;

[0078] The first cooling water channel 4-1 arranged inside the first probe 2-3 is connected to the first cooling water channel 4-1 formed between the cooling water shell 4-0 and the upper sliding sleeve 2-1;

[0079] The second cooling water channel 4-2 arranged inside the second probe 2-4 is connected to the first cooling water channel 4-1 formed between the cooling water shell 4-0 and the lower sliding sleeve 2-2;

[0080] The cooling water housing 4-0 is provided with a cooling water inlet 4-3 and a cooling water outlet 4-4, which are connected to a cold water circulation system.

[0081] Cooling water system 4 is used to cool the device to avoid measurement errors caused by high temperature.

[0082] As a preferred embodiment:

[0083] The vertical support 1-3 is provided with a first sliding groove and a second sliding groove 5 along the axial direction on opposite sides. A first constraint rod 6 and a second constraint rod 7 are respectively installed in the first sliding groove and the second sliding groove 5.

[0084] The first constraint rod 6 is fixedly connected to the upper sliding sleeve 2-1, and the second constraint rod 7 is fixedly connected to the lower sliding sleeve 2-2;

[0085] The first sliding groove, the second sliding groove 5, the first constraint rod 6, and the second constraint rod 7 can restrain the inclination of the upper sliding sleeve 2-1 and the lower sliding sleeve 2-2.

[0086] Example 2:

[0087] A high-temperature concrete strain measurement system includes the high-temperature concrete strain measurement device described in Example 1, and also includes a high-temperature furnace 8 and a pressure testing machine.

[0088] The high-temperature furnace 8 has square openings at the top and bottom, allowing the pressure head of the pressure testing machine to pass through the openings and apply pressure to the specimen inside the high-temperature furnace 8.

[0089] The high-temperature furnace 8 has an opening on its side wall, through which the first probe 2-3 and the second probe 2-4 can pass and extend into the high-temperature furnace 8;

[0090] Example 3:

[0091] A method for measuring high-temperature strain in concrete, characterized in that the method is implemented using the high-temperature strain measurement system for concrete described in Example 2, and includes the following steps:

[0092] Step 1: Place the concrete test block 9 into the high-temperature furnace 8;

[0093] Step 2: Move the vertical support 1-3 and adjust the positions of the upper sliding sleeve 2-1 and the lower sliding sleeve 2-2 so that the first probe 2-3 and the second probe 2-4 pass through the openings on the furnace wall of the high-temperature furnace 8 and the groove 2-5 matches the concrete embedded part 10 pre-embedded on the concrete test block 9.

[0094] Step 3: Set the heating rate and holding time of the high-temperature furnace 8. After the holding time is completed, turn on the pressure testing machine and apply pressure to the concrete test block 9.

[0095] Step 4: Axial displacement sensor 2-7 collects the distance change between upper sliding sleeve 2-1 and lower sliding sleeve 2-2, and radial displacement sensor 2-6 collects the relative displacement of vertical support 1-3;

[0096] Step 5: Based on the pressure data from the pressure testing machine, calculate the elastic modulus and Poisson's ratio of concrete specimen 9 to achieve high-temperature strain measurement of concrete.

[0097] The high-temperature furnace 8 has square openings at the top and bottom, allowing the pressure head to pass through the holes and apply pressure to the specimen inside the furnace. The furnace wall consists of a metal outer shell and an insulation layer made of refractory fiber. Inside, there are U-shaped silicon carbide rods for heating. The high-temperature furnace is connected to an external temperature control system, which can adjust the heating rate and holding time.

[0098] According to the "Standard for Test Methods of Physical and Mechanical Properties of Concrete", the formula for calculating the elastic modulus of concrete is:

[0099]

[0100] In the formula: E cF is the static compressive elastic modulus of concrete (MPa). a F0 is the load (N) at 1 / 3 of the axial compressive strength, and F0 is the initial load (N) at 0.5 MPa; A is the bearing area of ​​the specimen (mm2). 2 L is the gauge length (mm); Δn is the last loading from F0 to F a The deformation value (mm) of the specimen. Δn in Equation 1 is calculated from Equation 2:

[0101]

[0102] In the formula: x is the numerical value of the axial displacement sensor change; l is the probe length; α u The angle of change is determined by the horizontal angle sensor on the first probe rod 2-3 (counterclockwise is positive); α d The angle of the horizontal angle sensor on the second probe rod 2-4 changes (counterclockwise is positive).

[0103] Examples based on experimental data:

[0104]

[0105] As can be seen from the data, x is the strain measured by the displacement sensor, and Δn is the strain measured by the displacement sensor and the angle sensor. It can be seen that the angle displacement sensor accounts for a large proportion of the total displacement, so the effect of angle correction is obvious and can effectively reduce the error of the displacement sensor.

[0106] The formula for calculating the Poisson's ratio of a specimen is:

[0107]

[0108] Where: μ is the Poisson's ratio of the concrete specimen; Δτ is the value of the concrete specimen during the last loading from F0 to F a The lateral displacement (the value of the change in radial displacement sensor) is calculated by Equation 4;

[0109]

[0110] In the formula: x b The value represents the change in radial displacement sensor readings; l b It is half the length of the vertical support; α b The angle of change of the vertical angle sensor (counterclockwise is positive).

[0111] Examples based on experimental data:

[0112]

[0113] As can be seen from the data, x is the strain measured by the displacement sensor, and Δn is the strain measured by the displacement sensor and the angle sensor. It can be seen that the angle displacement sensor accounts for a large proportion of the total displacement, so the effect of angle correction is obvious and can effectively reduce the error of the displacement sensor.

[0114] In step 3, pressure can be applied to the concrete specimen 9 until it breaks. The changes in the axial displacement sensors 2-7 represent the displacement within the gauge length (distance between concrete embedded parts: 150mm) of the concrete specimen 9, and the changes in the horizontal angle sensors 2-10 represent the tilt of the probe caused by assembly gaps or elastic deformation. This process is used to determine the stress-strain curve of the concrete, and the calculation method is the same as described above.

[0115] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived by those skilled in the art within the scope of the technology disclosed in the present invention without creative effort are covered within the scope of protection of the present invention.

Claims

1. A high-temperature strain measuring device for concrete, comprising a support (1), characterized in that, It also includes a measuring device (2) mounted on a bracket (1); The bracket (1) includes an upper horizontal bracket (1-1), a lower horizontal bracket (1-2), and a vertical bracket (1-3) installed between the upper horizontal bracket (1-1) and the lower horizontal bracket (1-2). The vertical bracket (1-3) is capable of moving along the length of the upper horizontal bracket (1-1). The measuring device (2) includes an upper sliding sleeve (2-1) and a lower sliding sleeve (2-2) sleeved on a vertical support (1-3). A first probe (2-3) and a second probe (2-4) are respectively installed on the upper sliding sleeve (2-1) and the lower sliding sleeve (2-2). The first probe (2-3) is connected to the upper sliding sleeve (2-1) at one end and has a groove (2-5) at the other end. The second probe (2-4) is connected to the lower sliding sleeve (2-2) at one end and has a groove (2-5) at the other end. The grooves (2-5) are used to cooperate with the concrete embedded parts (10) pre-embedded on the concrete test block (9); The first probe (2-3) and the second probe (2-4) can pass through the openings in the side wall of the high-temperature furnace (8) and extend into the high-temperature furnace (8); A radial displacement sensor (2-6) is installed on the upper horizontal support (1-1) or the lower horizontal support (1-2), and an axial displacement sensor (2-7) is installed on the upper sliding sleeve (2-1) or the lower sliding sleeve (2-2). The radial displacement sensor (2-6) is used to measure the movement distance of the vertical support (1-3) along the upper horizontal support (1-1); the axial displacement sensor (2-7) is used to measure the movement distance of the upper sliding sleeve (2-1) relative to the lower sliding sleeve (2-2). The vertical support (1-3) is connected to the upper horizontal support (1-1) by a first vertical support sleeve (1-4) sleeved on the upper horizontal support (1-1), and the vertical support (1-3) is connected to the lower horizontal support (1-2) by a second vertical support sleeve (1-5) sleeved on the lower horizontal support (1-2). The vertical support (1-3) is provided with a first sliding groove and a second sliding groove (5) on opposite sides along the axial direction. A first constraint rod (6) and a second constraint rod (7) are respectively installed in the first sliding groove and the second sliding groove (5). The first constraint rod (6) is fixedly connected to the upper sliding sleeve (2-1), and the second constraint rod (7) is fixedly connected to the lower sliding sleeve (2-2); The first vertical support sleeve (1-4) can move along the upper horizontal support (1-1), and the second vertical support sleeve (1-5) can move along the lower horizontal support (1-2); The axial displacement sensor (2-7) is fixed on the upper sliding sleeve (2-1), and the probe of the axial displacement sensor (2-7) is in contact with the axial displacement gauge bracket (2-8) installed on the lower sliding sleeve (2-2). The radial displacement sensor (2-6) is fixed on the lower horizontal support (1-2), and the probe of the radial displacement sensor (2-6) is in contact with the radial displacement meter support (2-9) installed on the second vertical support sleeve (1-5).

2. The concrete high-temperature strain measuring device as described in claim 1, characterized in that, A horizontal angle sensor (2-10) is installed on the first probe (2-3) and the second probe (2-4), and a vertical angle sensor (2-11) is installed on the vertical bracket (1-3).

3. The high-temperature strain measuring device for concrete as described in claim 1, characterized in that: The first vertical support sleeve (1-4) and the second vertical support sleeve (1-5) are equipped with rollers (3), which are capable of moving along the upper horizontal support (1-1) and the lower horizontal support (1-2).

4. The high-temperature strain measuring device for concrete as described in claim 1, characterized in that, The measuring device (2) is also equipped with a cooling water system (4); The cooling water system (4) includes a cooling water housing (4-0) installed on the outside of the upper sliding sleeve (2-1) and the lower sliding sleeve (2-2), and the gap between the cooling water housing (4-0) and the upper sliding sleeve (2-1) or the lower sliding sleeve (2-2) forms a first cooling water channel (4-1). The cooling water system (3) further includes a second cooling water channel (4-2) arranged in the first probe (2-3) and the second probe (2-4); The first cooling water channel (4-1) arranged in the first probe (2-3) is connected to the first cooling water channel (4-1) formed between the cooling water shell (4-0) and the upper sliding sleeve (2-1); The second cooling water channel (4-2) arranged in the second probe (2-4) is connected to the first cooling water channel (4-1) formed between the cooling water shell (4-0) and the lower sliding sleeve (2-2); The cooling water housing (4-0) is provided with a cooling water inlet (4-3) and a cooling water outlet (4-4), which are connected to a cold water circulation system.

5. A high-temperature strain measurement system for concrete, characterized in that, The high-temperature concrete strain measuring device, as described in any one of claims 1-4, further includes a high-temperature furnace (8) and a pressure testing machine. The high-temperature furnace (8) has square openings at the top and bottom, and the pressure head of the pressure testing machine can pass through the openings to apply pressure to the specimen inside the high-temperature furnace (8); The high-temperature furnace (8) has an opening on its side wall, through which the first probe (2-3) and the second probe (2-4) can pass and extend into the high-temperature furnace (8).

6. A method for measuring high-temperature strain in concrete, characterized in that, This method is implemented using the high-temperature concrete strain measurement system described in claim 5, and includes the following steps: Step 1: Place the concrete test block (9) into the high-temperature furnace (8); Step 2: Move the vertical support (1-3), adjust the position of the upper sliding sleeve (2-1) and the lower sliding sleeve (2-2) so that the first probe (2-3) and the second probe (2-4) pass through the opening on the furnace wall of the high temperature furnace (9) and the groove (2-5) matches the pre-embedded concrete part (10) on the concrete test block (9); Step 3: Set the heating rate and holding time of the high-temperature furnace (8). After the holding time is completed, turn on the pressure testing machine and apply pressure to the concrete test block (9). Step 4: The axial displacement sensor (2-7) collects the distance change between the upper sliding sleeve (2-1) and the lower sliding sleeve (2-2), and the radial displacement sensor (2-6) collects the relative displacement of the vertical support (1-3); Step 5: Combine the pressure data from the pressure testing machine to calculate the elastic modulus and Poisson's ratio of the concrete specimen (9) and realize the high-temperature strain measurement of concrete.

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