Method for determining cracking temperature of mass concrete
By using metal protective pipes and extruded components in large volume concrete construction, the temperature sensor is directly in contact with the concrete, solving the problems of sensor damage and heat conduction errors, achieving more accurate temperature monitoring and higher structural safety.
Patent Information
- Application Number
- CN202411865562.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-11
AI Technical Summary
In the existing large-volume concrete construction, the direct burial method can easily lead to damage to the temperature sensor, and the metal protective pipe law affects the accuracy of the temperature reading.
A method is adopted, including a metal protective tube, an extrusion assembly, an ejection assembly, a limit assembly and a temperature sensor. By manually twisting the extrusion assembly after concrete is poured, the ejection assembly is extruded outside the metal protective tube, making the temperature sensor in direct contact with the concrete, reducing heat conduction errors, and ensuring the stable position of the ejection plate through the limit assembly.
The temperature sensor is avoided and positional offset during the pouring process is improved, the accuracy of temperature readings is improved, and the quality and safety of large-volume concrete structures are ensured.
Smart Images
Figure CN119595698A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of concrete temperature detection, and in particular to a method for determining the cracking temperature of mass concrete. Background Art
[0002] Determining the cracking temperature of mass concrete is an important step in preventing temperature cracks in concrete structures. This process involves continuous monitoring of the internal temperature of concrete to evaluate its temperature changes during the hardening process. This information is essential for developing effective temperature control measures, such as insulation covering, cooling systems and maintenance strategies to reduce temperature stress and prevent the formation of cracks. In addition, the monitoring results can also be used to adjust the concrete mix proportion and construction process to improve the crack resistance of concrete. Through these comprehensive measures, the long-term stability and durability of mass concrete structures can be ensured.
[0003] In the existing large-volume concrete construction, in order to ensure the quality of concrete, it is necessary to monitor the temperature inside the concrete to prevent cracks caused by temperature changes. The temperature sensor is a key device to achieve this goal. At present, there are two commonly used methods for installing temperature sensors, namely direct burial method and metal protection tube method. The direct burial method is to bury the temperature sensor directly in the poured concrete so that the sensor is in direct contact with the concrete and can accurately measure the temperature inside the concrete. The metal protection tube method is to place the temperature sensor in a metal protection tube and then insert the metal protection tube into the concrete.
[0004] When using the direct embedment method, the temperature sensor needs to be arranged in a suitable position in advance and then the concrete is poured. However, during the pouring process, the sensor may be easily damaged and the sensor position may be shifted due to the impact force of the concrete. When using the metal protective tube method, since the temperature sensor is located in the protective tube, it is necessary to measure the external concrete through the metal tube when performing temperature detection. The thermal conductivity characteristics of the metal tube itself may be different from those of the concrete, which will affect the accuracy of the temperature reading. Therefore, both measurement methods have certain disadvantages. For this reason, the present application provides a method for determining the cracking temperature of large-volume concrete. Summary of the invention
[0005] The purpose of this application is to solve the problem that the sensor is easily damaged when using the direct burial method, and the accuracy of the temperature reading is affected when using the metal protection tube method. This application provides a method for determining the cracking temperature of large-volume concrete.
[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions: A method for determining the cracking temperature of mass concrete includes a metal protection tube, an extrusion assembly, an ejection assembly, a limit assembly, and a temperature sensor, and includes the following steps: Step 1: First, fix the metal protection pipe at a suitable position according to the site requirements, so that the positions of the multiple through holes are respectively located at the upper, middle and lower positions of the concrete pouring area, and then start pouring concrete at the construction site; Step 2: When the concrete is poured but still unsolidified, you can manually twist the extrusion assembly to push the ejection assembly to move, so that the ejection assembly is squeezed out of the metal protection tube, so that the temperature sensor is in direct contact with the concrete, reducing the influence of the heat conduction characteristics of the metal protection tube itself and the concrete on the accuracy of the temperature reading: Step 3: When the extrusion component pushes the ejection component to move, the limiting component will fit with the extrusion component, so the limiting component will be ejected. The ejection plate can be more stably placed between the concrete through the ejection of the limiting component. Step 4: When the temperature sensor detects that the temperature inside the concrete is higher than the specified value, the alarm can sound to remind the construction workers to cool down the concrete in time. When the temperature is lower than the specified value, the alarm can also sound to insulate the concrete in time to ensure the quality and safety of large-volume concrete structures.
[0007] Furthermore, the extrusion assembly includes a fixed plate fixedly connected to the inside of the metal protective tube, a screw rod is rotatably connected to the fixed plate, the bottom of the screw rod is rotatably connected to the inner bottom surface of the metal protective tube, a plurality of extrusion blocks are threadedly connected to the screw rod, and a knob is fixedly connected to the top of the screw rod.
[0008] By adopting the above technical solution, the knob is manually turned to drive the screw rod to rotate, and the rotation of the screw rod can drive multiple extrusion blocks to gradually descend on the screw rod.
[0009] Furthermore, the ejection assembly includes two support plates symmetrically fixedly connected to the bottom of the fixed plate, and the two support plates are rotatably connected to multiple rotating shafts, and the multiple rotating shafts are rotatably connected to the ejection plates, and multiple through holes are evenly opened on both sides of the metal protective tube, and the temperature sensor is fixedly connected to the inclined surface of the ejection plate.
[0010] By adopting the above technical solution, when the multiple extrusion blocks gradually descend, they will squeeze one side of the ejector plate, so that the ejector plate rotates with the rotating shaft as the center, so as to squeeze the ejector plate from the through hole to the outside of the metal protective tube. At this time, the temperature sensor on the inclined surface of the ejector plate will directly contact the concrete instead of being inside the temperature sensor.
[0011] Furthermore, the ejector plate is triangular in shape, one side of the ejector plate is in contact with the bottom surface of the extrusion block, and the through hole has a size consistent with that of the ejector plate.
[0012] By adopting the above technical solution, when the multiple extrusion blocks gradually descend, they will squeeze one side of the ejector plate, so that the ejector plate rotates around the rotating shaft as the center, so as to extrude the ejector plate from the through hole to the outside of the metal protection tube.
[0013] Furthermore, the limiting assembly includes a slide groove opened inside the ejection plate, an adjusting rod is slidably connected inside the slide groove, one end of the adjusting rod is fixedly connected to the ejection block, the other end of the adjusting rod is fixedly connected to the bottom plate, and a spring is fixedly connected inside the slide groove, and one end of the spring is fixedly connected to one side of the bottom plate.
[0014] By adopting the above technical solution, as the ejection plate rotates, the ejection block on one side of the ejection plate will gradually fit with the extrusion block. At this time, the extrusion of the extrusion block will push the ejection block into the interior of the slide groove, thereby pushing the adjusting rod to slide inside the slide groove.
[0015] Furthermore, a through groove is formed inside the ejection plate, and a limiting block 1 is slidably connected in the through groove, and a limiting block 2 is slidably connected in the through groove. A fixing ring is fixedly connected to the adjusting rod, and a hinge plate is symmetrically rotatably connected to the fixing ring. The opposite surfaces of the limiting block 1 and the limiting block 2 are fixedly connected to connecting plates, and the end of the hinge plate away from the fixing ring is rotatably connected to the connecting plate.
[0016] By adopting the above technical solution, the two hinged plates are rotated to push the limit block 1 and the limit block 2 to slide inside the through groove, so that the limit block 1 and the limit block 2 extend from the through groove to the outside of the ejection plate to contact the external concrete.
[0017] Furthermore, the ends of the limiting block 1 and the limiting block 2 away from the connecting plate are both inclined.
[0018] By adopting the above technical solution, the limiting block 1 and the limiting block 2 can be inserted into the concrete more conveniently through the inclined surfaces.
[0019] Furthermore, a fixing frame is fixedly connected to the top of the metal protection tube, an alarm is fixedly connected to the top of the fixing frame, and the alarm is electrically connected to the temperature sensor.
[0020] By adopting the above technical solution, when the temperature sensor detects that the internal temperature of the concrete is higher or lower than a specified value, the alarm can be made to sound an alarm to remind construction workers to cool down or keep the concrete warm in time.
[0021] In summary, the present application includes at least one of the following beneficial effects: 1. The present application is provided with an extrusion component and an ejection component. First, the metal protective tube is fixed before pouring concrete. At this time, since the ejection plate and the temperature sensor are still inside the metal protective tube, the temperature sensor will not be affected by the impact force of pouring concrete, thereby avoiding damage to the temperature sensor and preventing the position of the temperature sensor from shifting. After pouring, the ejection plate can be squeezed out of the metal protective tube through the extrusion component. At this time, the temperature sensor will be in direct contact with the concrete. Therefore, when detecting the internal temperature of the concrete, there is no need to measure the external concrete through the metal protective tube, thereby reducing the possibility that the heat conduction characteristics of the metal protective tube itself may be different from those of the concrete, thereby affecting the accuracy of the temperature reading.
[0022] 2. In the present application, a limit assembly is provided. As the ejection plate rotates, the ejection block on one side of the ejection plate will gradually fit with the extrusion block. At this time, the extrusion of the extrusion block will cause the fixed ring to drive the two hinged plates to rotate, thereby pushing the limit block 1 and the limit block 2 to extend to the outside of the ejection plate to contact the external concrete, so that the ejection plate can be more stably located inside the concrete, and the temperature sensor can stably monitor the inside of the concrete in real time.
[0023] 3. This application is provided with an alarm. Since the alarm is electrically connected to the temperature sensor, when the temperature sensor detects that the internal temperature of the concrete is higher than a specified value, the alarm can sound an alarm to remind the construction personnel to cool down the concrete in time. When the temperature is lower than the specified value, the alarm can also sound an alarm to insulate the concrete in time to ensure the quality and safety of large-volume concrete structures. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the device body in this application.
[0025] Figure 2 It is a schematic diagram of the internal structure of the device body in this application.
[0026] Figure 3 It is a three-dimensional structural schematic diagram of the ejection assembly in this application.
[0027] Figure 4 It is a cross-sectional view of the ejection assembly in this application.
[0028] Description of reference numerals: 1. Metal protection tube; 2. Fixed plate; 3. Screw rod; 4. Extrusion block; 5. Knob; 6. Support plate; 7. Rotating shaft; 8. Ejector plate; 9. Through hole; 10. Temperature sensor; 11. Slide groove; 12. Adjustment rod; 13. Ejector block; 14. Bottom plate; 15. Spring; 16. Through groove; 17. Limit block 1; 18. Limit block 2; 19. Fixed ring; 20. Hinge plate; 21. Connecting plate; 22. Fixed bracket; 23. Alarm. DETAILED DESCRIPTION
[0029] The following is combined with Figure 1-4 This application is described in further detail.
[0030] The embodiment of the present application discloses a method for determining the cracking temperature of mass concrete.
[0031] Reference Figure 1 and Figure 2 A method for determining the cracking temperature of mass concrete includes a metal protection tube 1, an extrusion component, an ejection component, a limit component, and a temperature sensor 10, and includes the following steps: Step 1: First, fix the metal protection pipe 1 at a suitable position according to the site requirements, so that the positions of the multiple through holes 9 are respectively located at the upper, middle and lower positions of the concrete pouring area, and then start pouring concrete on the construction site; Step 2: When the concrete is poured but still in an unsolidified state, the extrusion assembly can be manually twisted to push the ejection assembly to move, thereby squeezing the ejection assembly out of the metal protection tube 1, so that the temperature sensor 10 is in direct contact with the concrete, reducing the influence of the heat conduction characteristics of the metal protection tube 1 itself and the concrete on the accuracy of the temperature reading: Step 3: When the extrusion component pushes the ejection component to move, the limiting component will fit with the extrusion component, so the limiting component will be ejected. The ejection plate 8 can be more stably placed between the concrete through the ejection of the limiting component. Step 4: When the temperature sensor 10 detects that the temperature inside the concrete is higher than the specified value, the alarm 23 can sound an alarm to remind the construction workers to cool down the concrete in time. When the temperature is lower than the specified value, the alarm 23 can also sound an alarm to insulate the concrete in time to ensure the quality and safety of large-volume concrete structures.
[0032] Reference Figure 1 and Figure 2The extrusion assembly includes a fixed plate 2 fixedly connected to the inside of the metal protection tube 1, a screw rod 3 is rotatably connected to the fixed plate 2, the bottom of the screw rod 3 is rotatably connected to the inner bottom surface of the metal protection tube 1, a plurality of extrusion blocks 4 are threadedly connected to the screw rod 3, and a knob 5 is fixedly connected to the top of the screw rod 3. The ejection assembly includes two support plates 6 symmetrically fixedly connected to the bottom of the fixed plate 2, a plurality of rotating shafts 7 are rotatably connected to the two support plates 6, and an ejection plate 8 is rotatably connected to the plurality of rotating shafts 7. A plurality of through holes 9 are evenly opened on both sides of the metal protection tube 1, a temperature sensor 10 is fixedly connected to the inclined surface of the ejection plate 8, the ejection plate 8 is triangular, one side of the ejection plate 8 is in contact with the bottom surface of the extrusion block 4, and the size of the through hole 9 is consistent with that of the ejection plate 8.
[0033] When in use, first fix the metal protection tube 1 at a suitable position according to the site requirements, so that the positions of the multiple through holes 9 are respectively located at the upper, middle and lower positions of the concrete pouring area, and then start pouring concrete on the construction site. At this time, because the ejector plate 8 and the temperature sensor 10 are still inside the metal protection tube 1, the temperature sensor 10 will not be affected by the impact force of pouring concrete, thereby avoiding damage to the temperature sensor 10 and preventing the position of the temperature sensor 10 from being offset, which greatly improves the use of the temperature sensor 10. The service life of the concrete can be prolonged, and the temperature detection can be performed more persistently. When the concrete is poured but still in an unsolidified state, the knob 5 can be manually turned to drive the screw 3 to rotate. The rotation of the screw 3 can drive the multiple extrusion blocks 4 to gradually descend on the screw 3. Because the bottom of the extrusion block 4 is in contact with the ejection plate 8, the multiple extrusion blocks 4 will squeeze one side of the ejection plate 8 when they gradually descend, so that the ejection plate 8 rotates with the rotating shaft 7 as the center of the circle, so as to extrude the ejection plate 8 from the through hole 9 to the outside of the metal protection tube 1, which will make the ejection plate 8 inclined. The temperature sensor 10 on the concrete is in direct contact with the concrete instead of being inside the metal protective tube 1. Therefore, when detecting the internal temperature of the concrete, there is no need to measure the external concrete through the metal protective tube 1, which reduces the fact that the heat conduction characteristics of the metal protective tube 1 itself may be different from those of the concrete, thereby affecting the accuracy of the temperature reading. At this time, the temperature sensor 10 can monitor the temperature changes inside the concrete in real time. These data are crucial for analyzing the thermal behavior of concrete and predicting possible cracking risks. When the temperature sensor 10 detects that the internal temperature of the concrete is higher than a specified value, the concrete can be cooled in time, and when the temperature is lower than the specified value, the concrete can be insulated in time to ensure the quality and safety of large-volume concrete structures. In addition, when the extrusion block 4 moves the extrusion ejection plate 8 to be completely ejected, the limit assembly on the ejection plate 8 will fit with one side of the extrusion block 4, and the limit assembly inside the ejection plate 8 will be ejected by the extrusion of one side of the extrusion block 4. The ejection of the limit assembly can make the ejection plate 8 more stably located between the concrete.
[0034] Reference Figure 3 and Figure 4 The limit assembly includes a slide groove 11 provided inside the ejection plate 8, an adjusting rod 12 is slidably connected inside the slide groove 11, one end of the adjusting rod 12 is fixedly connected to a top block 13, and the other end of the adjusting rod 12 is fixedly connected to a bottom plate 14, a spring 15 is fixedly connected inside the slide groove 11, and one end of the spring 15 is fixedly connected to one side of the bottom plate 14, a through groove 16 is provided inside the ejection plate 8, a limit block 17 is slidably connected inside the through groove 16, and a limit block 2 18 is slidably connected inside the through groove 16, a fixing ring 19 is fixedly connected to the adjusting rod 12, and a hinged plate 20 is symmetrically rotatably connected to the fixing ring 19, and the opposite surfaces of the limit block 17 and the limit block 2 18 are fixedly connected to a connecting plate 21, and the end of the hinged plate 20 away from the fixing ring 19 is rotatably connected to the connecting plate 21, and the ends of the limit block 17 and the limit block 2 18 away from the connecting plate 21 are both inclined.
[0035] When in use, as the ejection plate 8 rotates, the ejection block 13 on one side of the ejection plate 8 will gradually fit with the extrusion block 4. At this time, the extrusion of the extrusion block 4 will push the ejection block 13 into the inside of the slide groove 11, thereby pushing the adjustment rod 12 to slide inside the slide groove 11, and the bottom plate 14 squeezes the spring 15 to shrink. When the adjustment rod 12 slides, it will drive the fixing ring 19 to drop together. At this time, according to the limit guidance of the through groove 16, the fixing ring 19 will drive the two hinge plates 20 to rotate, so that the two hinge plates 2 0 is rotated to push the limit block 17 and the limit block 2 18 to slide inside the through groove 16, so that the limit block 17 and the limit block 2 18 extend from the inside of the through groove 16 to the outside of the ejection plate 8 to contact the external concrete. Through the inclined surfaces of the limit block 17 and the limit block 2 18, it can be more convenient to insert into the concrete, and through the ejection of the limit block 17 and the limit block 2 18, the ejection plate 8 can be more stably located inside the concrete, so that the temperature sensor 10 can stably monitor the inside of the concrete in real time.
[0036] Reference Figure 1 and Figure 2 A fixing frame 22 is fixedly connected to the top of the metal protection tube 1 , an alarm 23 is fixedly connected to the top of the fixing frame 22 , and the alarm 23 is electrically connected to the temperature sensor 10 .
[0037] When in use, when the temperature sensor 10 detects that the temperature inside the concrete is higher than a specified value, the alarm 23 can sound an alarm to remind construction workers to cool down the concrete in time. When the temperature is lower than the specified value, the alarm 23 can also sound an alarm to insulate the concrete in time to ensure the quality and safety of large-volume concrete structures.
[0038] The implementation principle of a method for determining the cracking temperature of large-volume concrete in this embodiment is as follows: when in use, the metal protection tube 1 is first fixed at a suitable position according to the site requirements, so that the positions of the multiple through holes 9 are respectively located at the upper, middle and lower positions of the concrete pouring area, and then the concrete pouring of the construction site is started. At this time, because the ejector plate 8 and the temperature sensor 10 are still inside the metal protection tube 1, the temperature sensor 10 will not be affected by the impact force of the pouring concrete, thereby avoiding damage to the temperature sensor 10 and preventing the position of the temperature sensor 10 from being offset, greatly improving the service life of the temperature sensor 10, and being able to perform temperature detection more persistently. When the concrete is poured and is still in an unsolidified state, the knob 5 can be manually turned to drive the screw rod 3 to rotate, and the rotation of the screw rod 3 can drive multiple The extrusion blocks 4 gradually descend on the screw rod 3. Since the bottom of the extrusion blocks 4 fits with the ejection plate 8, the multiple extrusion blocks 4 will squeeze one side of the ejection plate 8 when they gradually descend, so that the ejection plate 8 rotates with the rotating shaft 7 as the center, so as to extrude the ejection plate 8 from the through hole 9 to the outside of the metal protection tube 1. At this time, the temperature sensor 10 on the inclined surface of the ejection plate 8 will be in direct contact with the concrete instead of being in the slide groove 11. Therefore, when detecting the internal temperature of the concrete, there is no need to measure the external concrete through the metal protection tube 1, which reduces the possibility that the heat conduction characteristics of the metal protection tube 1 itself may be different from those of the concrete, thereby affecting the accuracy of the temperature reading. At this time, the temperature sensor 10 can monitor the temperature changes inside the concrete in real time. These data are crucial for analyzing the thermal behavior of the concrete and predicting possible cracking risks. When the temperature sensor 10 detects that the temperature inside the concrete is higher than a specified value, the alarm 23 can sound an alarm to remind the construction workers to cool down the concrete in time. When the temperature is lower than the specified value, the alarm 23 can also sound an alarm to timely insulate the concrete to ensure the quality and safety of the large-volume concrete structure. In addition, as the ejection plate 8 rotates, the ejection block 13 on one side of the ejection plate 8 will gradually fit with the extrusion block 4. At this time, the extrusion of the extrusion block 4 will push the ejection block 13 into the inside of the slide groove 11, thereby pushing the adjustment rod 12 to slide inside the slide groove 11, and the bottom plate 14 squeezes the spring 15 to shrink. When the adjustment rod 12 slides, it will drive the fixing ring 19 to drop together. At this time, according to the limit guidance of the through groove 16, the fixing ring 19 will drive the two hinge plates 20 to rotate, so that the two hinge plates 20 can be adjusted. The rotation of the limit block 17 and the limit block 18 is used to push the limit block 17 and the limit block 18 to slide inside the through groove 16, so that the limit block 17 and the limit block 18 extend from the inside of the through groove 16 to the outside of the ejection plate 8 to contact the external concrete. Through the inclined surfaces of the limit block 17 and the limit block 18, it can be more convenient to insert into the concrete, and through the ejection of the limit block 17 and the limit block 18, the ejection plate 8 can be more stably located inside the concrete, so that the temperature sensor 10 can stably monitor the inside of the concrete in real time.
Claims
1. A method for determining the cracking temperature of mass concrete, comprising a metal protection tube (1), an extrusion assembly, an ejection assembly, a limit assembly, and a temperature sensor (10), characterized in that: The steps include: Step 1: First, fix the metal protection pipe (1) at a suitable position according to the site requirements, so that the positions of the plurality of through holes (9) are respectively located at the upper, middle and lower positions of the concrete pouring area, and then start pouring concrete at the construction site; Step 2: When the concrete is poured but still in an unsolidified state, the extrusion assembly can be manually twisted. The operation of the extrusion assembly can push the ejection assembly to move, thereby squeezing the ejection assembly out of the metal protection tube (1), so that the temperature sensor (10) is in direct contact with the concrete, thereby reducing the influence of the heat conduction characteristics of the metal protection tube (1) itself and the concrete on the accuracy of the temperature reading. Step 3: When the extrusion component pushes the ejection component to move, the limiting component will fit with the extrusion component, so the limiting component will be ejected. The ejection plate (8) can be more stably placed between the concrete by the ejection of the limiting component. Step 4: When the temperature sensor (10) detects that the temperature inside the concrete is higher than a specified value, the alarm (23) can be set off to remind the construction personnel to cool down the concrete in time. When the temperature is lower than the specified value, the alarm (23) can also be set off to insulate the concrete in time, so as to ensure the quality and safety of the large-volume concrete structure.
2. A method for determining the cracking temperature of mass concrete according to claim 1, characterized in that: The extrusion assembly comprises a fixing plate (2) fixedly connected to the inside of the metal protection tube (1), a screw rod (3) passing through the fixing plate (2) and rotatably connected, the bottom of the screw rod (3) being rotatably connected to the inner bottom surface of the metal protection tube (1), a plurality of extrusion blocks (4) being threadedly connected to the screw rod (3), and a knob (5) being fixedly connected to the top of the screw rod (3).
3. A method for determining the cracking temperature of mass concrete according to claim 2, characterized in that: The ejection assembly comprises two support plates (6) symmetrically fixedly connected to the bottom of the fixed plate (2), the two support plates (6) are rotatably connected to a plurality of rotating shafts (7), the plurality of rotating shafts (7) are rotatably connected to an ejection plate (8), a plurality of through holes (9) are evenly formed on both sides of the metal protection tube (1), and the temperature sensor (10) is fixedly connected to the inclined surface of the ejection plate (8).
4. A method for determining the cracking temperature of mass concrete according to claim 3, characterized in that: The ejector plate (8) is triangular in shape, one side of the ejector plate (8) is in contact with the bottom surface of the extrusion block (4), and the through hole (9) is the same size as the ejector plate (8).
5. A method for determining the cracking temperature of mass concrete according to claim 3, characterized in that: The limit assembly comprises a slide groove (11) provided inside the ejection plate (8); an adjusting rod (12) is slidably connected inside the slide groove (11); one end of the adjusting rod (12) is fixedly connected to a top block (13); the other end of the adjusting rod (12) is fixedly connected to a bottom plate (14); a spring (15) is fixedly connected inside the slide groove (11); one end of the spring (15) is fixedly connected to one side of the bottom plate (14).
6. A method for determining the cracking temperature of mass concrete according to claim 5, characterized in that: A through groove (16) is formed inside the ejection plate (8), a first limit block (17) is slidably connected inside the through groove (16), a second limit block (18) is slidably connected inside the through groove (16), a fixing ring (19) is fixedly connected to the adjusting rod (12), a hinge plate (20) is symmetrically rotatably connected to the fixing ring (19), the opposite surfaces of the first limit block (17) and the second limit block (18) are fixedly connected to a connecting plate (21), and one end of the hinge plate (20) away from the fixing ring (19) is rotatably connected to the connecting plate (21).
7. A method for determining the cracking temperature of mass concrete according to claim 6, characterized in that: The ends of the first limiting block (17) and the second limiting block (18) away from the connecting plate (21) are both inclined.
8. A method for determining the cracking temperature of mass concrete according to claim 1, characterized in that: A fixing frame (22) is fixedly connected to the top of the metal protection tube (1), an alarm (23) is fixedly connected to the top of the fixing frame (22), and the alarm (23) is electrically connected to the temperature sensor (10).