A high-strength concrete strength testing device and method under low-temperature environment

Abstract

The application discloses a high-strength concrete strength test device and method in a low-temperature environment, which comprises a loading barrel for providing a test environment, and a test mechanism arranged on the body of the loading barrel, wherein the test mechanism comprises an upper flange and a lower flange, the outer surfaces of the upper flange and the lower flange are respectively embedded and movably connected with the two sides inside the loading barrel, support is provided through a flange body, an ultrasonic wave emitting probe is arranged in the inside of the upper flange, and an ultrasonic wave receiving probe is arranged in the inside of the lower flange, and the application relates to the technical field of concrete, solves the problem that the existing concrete strength test device can only test the strength of solidified concrete during use, thereby limiting the use range, and solves the problems that the test is conducted through a loading mode, the external heat preservation equipment is easily damaged, the requirement on the compression resistance of the device is high, and the manufacturing cost of the device is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete, in particular to a high-strength concrete strength test device and method under low-temperature environment. BACKGROUND

[0002] At present, the method of taking out the frozen concrete sample to the normal temperature environment for strength test is prone to uneven temperature of the sample, resulting in inaccurate test results. In the application number CN201310673956.3, an ultralow-temperature environment concrete splitting strength test device and test method are disclosed, which comprises a universal testing machine and a low-temperature box placed between the upper and lower pressing plates of the universal testing machine. The device has good integrity, simple structure and convenient disassembly. The test method is simple, easy to operate and realize, ensures the efficiency and the accuracy of the test.

[0003] Although the device has the above advantages, it still has the following defects in actual use:

[0004] 1) The device can only test the already solidified concrete block, and can only test the strength properties of the concrete, which limits the actual use range.

[0005] 2) When testing the concrete block, the device uses impact and splitting methods, which not only easily damages the external insulation equipment, but also requires high compression resistance of the device as a whole, thereby increasing the manufacturing cost of the device.

[0006] Therefore, the problems of the above device still need to be solved. SUMMARY

[0007] In view of the deficiencies of the prior art, the present application provides a high-strength concrete strength test device and method under low-temperature environment, which solves the problem that the existing concrete strength test device can only test the strength of the solidified concrete, which limits the use range, and the test by loading method easily damages the external insulation equipment and requires high compression resistance of the device, thereby increasing the manufacturing cost of the device.

[0008] To achieve the above purpose, the present application is realized by the following technical scheme: a high-strength concrete strength test device under low-temperature environment, comprising:

[0009] a loading barrel for providing a test environment;

[0010] Test mechanism, the test mechanism is arranged on the body of the loading barrel, the test mechanism includes upper flange and lower flange, the outer surface of the upper flange and lower flange is embedded with two sides of the inside of the loading barrel respectively, and the flange body is supported, the inside of the upper flange is provided with ultrasonic wave transmitting probe, the inside of the lower flange is provided with ultrasonic wave receiving probe, the outer surface between the ultrasonic wave transmitting probe and the ultrasonic wave receiving probe is provided with sample, the strength test of concrete sample is carried out by ultrasonic wave penetration concrete sample, the spiral pipe is arranged between the upper flange and the lower flange, the spiral pipe is sleeved on the outside of the loading barrel, and low-temperature environment is provided for the loading barrel by flowing refrigerant in the spiral pipe;

[0011] Heat preservation assembly, the heat preservation assembly is arranged outside the spiral pipe, and provides a heat preservation environment for the outside of the spiral pipe.

[0012] Preferably, the outside of the loading barrel is respectively provided with a refrigeration station, a monitoring data acquisition instrument and an ultrasonic wave transmitter, the output end of the refrigeration station is communicated with the two ends of the spiral pipe, the data receiving connector and the ultrasonic receiving connector are respectively embedded and fixedly connected on both sides of the lower flange arc edge, the input end of the ultrasonic receiving connector is electrically connected with the output end of the ultrasonic wave receiving probe, the output end of the ultrasonic receiving connector is electrically connected with the input end of the ultrasonic wave transmitter, the input end of the data receiving connector is electrically connected with a copper-nickel temperature sensor, the copper-nickel temperature sensor is arranged in the inside of the loading barrel, the output end of the data receiving connector is electrically connected with the input end of the monitoring data acquisition instrument, and the output end of the ultrasonic wave transmitter is electrically connected with the input end of the ultrasonic wave transmitting probe.

[0013] Preferably, the heat preservation assembly includes an inner cylinder, the inner cylinder is sleeved on the outside of the spiral pipe, the outer surface of the inner cylinder is movably connected with the outer surface of the upper flange and the lower flange respectively, the outer surface of the inner cylinder is sleeved with an outer cylinder, the outer surface of the inner cylinder is fixedly connected with a fixed ring, the outer surface of the fixed ring is fixedly connected with the inside of the outer cylinder, and the inner wall of the inner cylinder is provided with a silver plating layer.

[0014] Preferably, the body of the fixed ring is provided with a longitudinal through air hole, the body of the outer cylinder is fixedly connected with an air pipe, the inside of the air pipe is fixedly connected with a fan, and the body of the outer cylinder is fixedly connected with two heat preservation pipes, one end of the two heat preservation pipes is fixedly connected with the body of the inner cylinder and extends to the inside of the inner cylinder, and the two heat preservation pipes are used for heat preservation at the connection between the spiral pipe and the refrigeration station.

[0015] Preferably, the outer part of the inner cylinder is provided with a clamping unit, the clamping unit comprises two sealing rings, the outer surfaces of the two sealing rings are movably connected with the inner part of the outer cylinder, the outer surfaces of the two sealing rings are movably connected with the resistance rings, the outer surfaces of the two resistance rings are fixedly connected with the outer surface of the outer cylinder and the outer surface of the inner cylinder respectively.

[0016] Preferably, the outer surface of the sealing ring is provided with a groove, the inner part of the groove is fixedly connected with a telescopic rod, the outer surface of the telescopic rod is fixedly connected with a clamping ring, the outer surfaces of the two clamping rings are fixedly connected with the outer surfaces of the upper flange and the lower flange respectively.

[0017] Preferably, the body of the telescopic rod is provided with a pressure regulating module, the pressure regulating module comprises a compression spring, the compression spring is sleeved on the outer part of the telescopic rod, one end of the compression spring is fixedly connected with the inner part of the groove, the other end of the compression spring is fixedly connected with a push ring, the push ring is sleeved on the outer part of the telescopic rod, the outer surface of the push ring is movably connected with the inner part of the groove, the outer surface of the push ring is provided with a rotating groove, the inner part of the rotating groove is rotatably connected with a rotating ring, the outer surface of the rotating ring is fixedly connected with a nut, the ring of the nut is threadedly connected with the outer surface of the telescopic rod.

[0018] The application also discloses a high-strength concrete strength test method under low-temperature environment.

[0019] Step one, connect the loading barrel with the lower flange, then electrically connect the data receiving connector with the copper-nickel temperature sensor and the monitoring data acquisition instrument respectively, then electrically connect the ultrasonic receiving connector with the ultrasonic receiving probe and the ultrasonic transmitter respectively, then sleeve the spiral pipe on the outer part of the loading barrel, place the outer cylinder on the lower flange through the abutment with one side clamping ring, place the catheter in the inner part of the heat preservation pipe, and connect the refrigeration station with the spiral pipe.

[0020] Step two, pour the to-be-tested concrete in the inner part of the loading barrel to form a test sample, electrically connect the ultrasonic transmitter with the ultrasonic transmitting probe, then assemble the upper flange with the loading barrel, and close the upper part of the outer cylinder through the abutment of the other side resistance ring, then the fan extracts the air in the inner part of the outer cylinder and discharges it, and the outer end of the air pipe is closed when the inner part of the outer cylinder is in a vacuum state.

[0021] Step three, in the solidification stage of the concrete test sample, provide different low-temperature environments for the test process through the refrigeration station and the spiral pipe, test the hardness through the ultrasonic wave, and monitor the temperature and humidity of the concrete during solidification through the copper-nickel temperature sensor, and then analyze the relationship between the low temperature and the strength of the concrete test sample according to the test data.

[0022] Advantages

[0023] The application provides a high-strength concrete strength test device and method in a low-temperature environment.

[0024] (1) By setting the test mechanism, the concrete is poured in the loading barrel, the ultrasonic emission probe and the ultrasonic receiving probe can load the concrete, and the strength change of the concrete in the low-temperature environment setting process can be detected through the transmission speed of the ultrasonic wave, and the temperature and humidity of the concrete can be monitored, so that the concrete can be comprehensively tested, the equipment will not be damaged, and the use and maintenance cost of the device is reduced.

[0025] (2) By setting the heat preservation assembly, the annular space is provided outside the spiral pipe by the inner cylinder and the outer cylinder, and the heat preservation performance is improved by vacuumizing, so that the energy loss of the spiral pipe in providing low temperature is reduced, the silver plating layer can reduce the radiation energy loss, and the temperature inside the inner cylinder is balanced, and the accuracy of the test result is improved.

[0026] (3) By setting the clamping unit, the clamping of the abutment ring and the outer cylinder can fix the positions of the outer cylinder and the inner cylinder, and can also play a sealing connection role, and in the vacuumizing process, the sealing ring and the abutment ring on both sides are abutted, and the sealing property of both sides of the vacuum environment is further improved.

[0027] (4) By setting the pressure adjusting module, the reset of the sealing ring is facilitated by the setting of the compression spring, and the nut moves along the extension rod, so that the push ring slides to adjust the distance between the two ends of the compression spring, so that the spring force can be adjusted according to the actual use requirement. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the internal structure front view of the application;

[0029] Figure 2 It is the external structure perspective view of the application;

[0030] Figure 3 It is the internal structure perspective view of the outer cylinder of the application;

[0031] Figure 4 It is the external structure perspective view of the sealing ring of the application;

[0032] Figure 5 It is the internal structure perspective view of the push ring of the application.

[0033] In the figure: 1, upper flange; 2, loading barrel; 3, lower flange; 31, ultrasonic receiving joint; 32, data receiving joint; 4, refrigeration station; 41, spiral pipe; 5, monitoring data acquisition instrument; 51, copper-nickel temperature sensor; 6, sample; 7, ultrasonic transmitter; 71, ultrasonic emission probe; 72, ultrasonic receiving probe; 8, heat preservation assembly; 81, inner cylinder; 82, clamping unit; 821, sealing ring; 822, abutment ring; 823, groove; 824, telescopic rod; 825, pressure regulating module; 8251, compression spring; 8252, push ring; 8253, rotating groove; 8254, rotating ring; 8255, nut; 826, clamping ring; 83, outer cylinder; 84, fixed ring; 85, silver plating layer; 86, air hole; 87, air pipe; 88, fan; 89, heat preservation pipe. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0035] Please refer to Figures 1-5 , the present application provides a technical solution: a high-strength concrete strength test device under low-temperature environment:

[0036] Embodiment one: refer to the attached Figure 1 , attached Figure 2 ;

[0037] The loading barrel 2 is externally provided with a testing mechanism, the testing mechanism comprises an upper flange 1 and a lower flange 3, the outer surfaces of the upper flange 1 and the lower flange 3 are respectively embedded and movably connected with two sides inside the loading barrel 2, a spiral pipe 41 is arranged between the upper flange 1 and the lower flange 3, the spiral pipe 41 is sleeved on the outside of the loading barrel 2, the outside of the spiral pipe 41 is provided with a heat preservation assembly 8, the inside of the upper flange 1 is provided with an ultrasonic wave transmitting probe 71, the inside of the lower flange 3 is provided with an ultrasonic wave receiving probe 72, a test sample 6 is arranged between the outer surfaces of the ultrasonic wave transmitting probe 71 and the ultrasonic wave receiving probe 72, the strength of the concrete test sample 6 is tested by penetrating the concrete test sample 6 with ultrasonic waves, the outside of the loading barrel 2 is respectively provided with a refrigeration station 4, a monitoring data acquisition instrument 5 and an ultrasonic wave transmitter 7, the model of the ultrasonic wave transmitter 7 is DPR500, the model of the monitoring data acquisition instrument 5 is HGPt-Co-S100, the refrigeration station 4 is formed by an existing compressor, the output end of the refrigeration station 4 is communicated with one end of the spiral pipe 41, the other end of the spiral pipe 41 is communicated with the output end of the refrigeration station 4, the two sides of the arc edge of the lower flange 3 are respectively embedded and fixedly connected with a data receiving connector 32 and an ultrasonic receiving connector 31, the two sides of the body of the lower flange 3 are provided with right-angled connecting channels, so as to provide stable support for the bottom, the input end of the ultrasonic receiving connector 31 is electrically connected with the output end of the ultrasonic wave receiving probe 72, the output end of the ultrasonic receiving connector 31 is electrically connected with the input end of the ultrasonic wave transmitter 7, the input end of the data receiving connector 32 is electrically connected with a copper-nickel temperature sensor 51, the copper-nickel temperature sensor 51 is also called a T-shaped thermocouple, the model of the copper-nickel temperature sensor 51 is WJ127, the copper-nickel temperature sensor 51 is arranged inside the loading barrel 2, the output end of the data receiving connector 32 is electrically connected with the input end of the monitoring data acquisition instrument 5, and the output end of the ultrasonic wave transmitter 7 is electrically connected with the input end of the ultrasonic wave transmitting probe 71.

[0038] In the embodiment, the lower flange 3 is assembled with the loading barrel 2 first, then the concrete to be tested is poured into the loading barrel 2 to form the test sample 6, then the upper flange 1 is assembled with the loading barrel 2, then the refrigeration station 4 and the spiral pipe 41 provide a low-temperature test environment for the test sample 6, and meanwhile, in the solidification process of the test sample 6, the strength of the test sample 6 is detected by the ultrasonic detection technology through the cooperation of the ultrasonic wave transmitter 7, the ultrasonic wave transmitting probe 71, the ultrasonic wave receiving probe 72 and the ultrasonic receiving connector 31, and the temperature and humidity data of the test sample 6 are collected by the data receiving connector 32, the copper-nickel temperature sensor 51 and the monitoring data acquisition instrument 5.

[0039] In the embodiment, the lower flange 3 is assembled with the loading barrel 2 first, then the concrete to be tested is poured into the loading barrel 2 to form the test sample 6, then the upper flange 1 is assembled with the loading barrel 2, then the refrigeration station 4 and the spiral pipe 41 provide a low-temperature test environment for the test sample 6, and meanwhile, in the solidification process of the test sample 6, the strength of the test sample 6 is detected by the ultrasonic detection technology through the cooperation of the ultrasonic wave transmitter 7, the ultrasonic wave transmitting probe 71, the ultrasonic wave receiving probe 72 and the ultrasonic receiving connector 31, and the temperature and humidity data of the test sample 6 are collected by the data receiving connector 32, the copper-nickel temperature sensor 51 and the monitoring data acquisition instrument 5. Figure 2 Figure 3 ;

[0040] ​The heat preservation assembly 8 comprises an inner cylinder 81, the inner cylinder 81 is sleeved outside the spiral pipe 41, the outer surface of the inner cylinder 81 is movably connected with the outer surface of the upper flange 1 and the lower flange 3 respectively, the outer portion of the inner cylinder 81 is sleeved with an outer cylinder 83, the outer cylinder 83 and the inner cylinder 81 are made of materials with good compression resistance, wear resistance, heat preservation and sealing performance, the outer surface of the inner cylinder 81 is fixedly connected with a fixed ring 84, the fixed ring 84 is used for fixing between the outer cylinder 83 and the inner cylinder 81, the outer surface of the fixed ring 84 is fixedly connected with the inner portion of the outer cylinder 83, the inner wall of the inner cylinder 81 is provided with a silver plating layer 85, the body of the fixed ring 84 is provided with a plurality of gas holes 86 penetrating in the longitudinal direction, the gas holes 86 are arranged at equal angles, and the gas holes 86 are used for the space communication between the outer cylinder 83 and the inner cylinder 81, the body of the outer cylinder 83 is fixedly connected with a gas pipe 87 penetrating, a valve for closing can be arranged on the gas pipe 87, the inner portion of the gas pipe 87 is fixedly connected with a fan 88, the fan 88 is made of an existing air extractor, and the fan 88 is electrically connected with an external control circuit, the body of the outer cylinder 83 is fixedly connected with two heat preservation pipes 89 penetrating, one end of the two heat preservation pipes 89 is fixedly connected with the body of the inner cylinder 81 and extends to the inner portion of the inner cylinder 81, and the two heat preservation pipes 89 are used for heat preservation at the connection position between the spiral pipe 41 and the refrigeration station 4.

[0041] In the embodiment, the combination of the inner cylinder 81 and the outer cylinder 83 is sleeved outside the spiral pipe 41, and is closed by contacting with the upper flange 1 and the lower flange 3, then the fan 88 works to exhaust the air between the inner cylinder 81 and the outer cylinder 83 through the gas pipe 87, so as to form a circle of vacuum space, so as to preserve the spiral pipe 41, after the vacuumization is completed, the valve is closed to block the inner portion of the gas pipe 87, then the fan 88 stops working, and through the arrangement of the silver plating layer 85, the radiant heat loss can be reduced, and the temperature inside the inner cylinder 81 is balanced, so as to improve the accuracy of the test result.

[0042] Embodiment three: on the basis of embodiment two, referring to the drawings of the specification Figure 2 , the drawings of the specification Figure 4 ;

[0043] The outer part of the inner cylinder 81 is provided with a clamping unit 82, which comprises two sealing rings 821 made of the same material as the outer cylinder 83 and provided with chamfers at both corners on one side. The outer surfaces of the two sealing rings 821 are movably connected with the inner part of the outer cylinder 83. The outer surfaces of the two sealing rings 821 are movably connected with the outer surfaces of the two abutting rings 822 made of the same material as the sealing ring 821 and provided with chamfers on the side in contact with the sealing ring 821. The chamfers are obliquely extruded between them to further improve the sealing performance. The outer surfaces of the two abutting rings 822 are fixedly connected with the inner part of the outer cylinder 83 and the outer surface of the inner cylinder 81, respectively. The outer surface of the sealing ring 821 is provided with a groove 823, and the inner part of the groove 823 is fixedly connected with an expansion rod 824. The expansion rod 824 can support, limit and guide the movement of the sealing ring 821. The outer surface of the expansion rod 824 is fixedly connected with a clamping ring 826 made of the same material as the sealing ring 821 and having the same width as the distance between the inner cylinder 81 and the outer cylinder 83. The outer surfaces of the two clamping rings 826 are fixedly connected with the outer surfaces of the upper flange 1 and the lower flange 3, respectively.

[0044] In this embodiment, the clamping ring 826 can realize positioning and fixation during assembly of the outer cylinder 83. During the vacuumizing process, the two sealing rings 821 are moved close to each other under the action of negative pressure, so that the sealing performance of the two sides of the vacuumizing area is improved through the oblique abutment between the chamfers of the sealing ring 821 and the two abutting rings 822.

[0045] Example Four: Based on example three, refer to the attached Figure 4 , drawings Figure 5 ;

[0046] The body of the expansion rod 824 is provided with a pressure regulating module 825, which comprises a compression spring 8251 that can keep the sealing ring 821 and the abutting ring 822 in contact through the elastic force. The compression spring 8251 is sleeved on the outer part of the expansion rod 824, one end of the compression spring 8251 is fixedly connected with the inner part of the groove 823, and the other end of the compression spring 8251 is fixedly connected with a push ring 8252 that can support the compression spring 8251. The push ring 8252 is sleeved on the outer part of the expansion rod 824, the outer surface of the push ring 8252 is movably connected with the inner part of the groove 823, the outer surface of the push ring 8252 is provided with a rotating groove 8253, the inner part of the rotating groove 8253 is rotatably connected with a rotating ring 8254, the cross section of the rotating ring 8254 is T-shaped to improve the stability of the connection, the outer surface of the rotating ring 8254 is fixedly connected with a nut 8255, and the ring of the nut 8255 is threadedly connected with the outer surface of the expansion rod 824.

[0047] In the embodiment, the nut 8255 is rotated, and is axially moved along the telescopic rod 824 through the threaded connection between the nut 8255 and the surface of the telescopic rod 824, and the push ring 8252 is driven to move synchronously with one end of the compression spring 8251 through the connection between the rotating ring 8254 and the push ring 8252, so that the distance between the two ends of the compression spring 8251 is adjusted, the elastic force of the compression spring 8251 is adjusted, and the sealing ring 821 can maintain contact with the abutting ring 822.

[0048] The application further discloses a high-strength concrete strength test method in a low-temperature environment.

[0049] Step one, connect the loading barrel 2 with the lower flange 3, electrically connect the data receiving connector 32 with the copper-nickel temperature sensor 51 and the monitoring data acquisition instrument 5 respectively, then electrically connect the ultrasonic receiving connector 31 with the ultrasonic receiving probe 72 and the ultrasonic transmitter 7 respectively, then set the spiral pipe 41 outside the loading barrel 2, place the outer cylinder 83 on the lower flange 3 through abutting with one side of the clasp ring 826, place the catheter inside the heat preservation pipe 89, and connect the refrigeration station 4 with the spiral pipe 41;

[0050] Step two, pour the concrete to be tested in the loading barrel 2 to form the test sample 6, electrically connect the ultrasonic transmitter 7 with the ultrasonic transmitting probe 71, then assemble the upper flange 1 with the loading barrel 2, and close the upper part of the outer cylinder 83 through abutting of the other side of the abutting ring 822 with the outer cylinder 83, then the fan 88 extracts the air in the outer cylinder 83 and discharges, and the outer end of the air pipe 87 is closed when the inner part of the outer cylinder 83 is in a vacuum state;

[0051] Step three, in the solidification stage of the concrete test sample 6, different low-temperature environments are provided for the test process of the concrete test sample 6 through the refrigeration station 4 and the spiral pipe 41, the hardness of the concrete test sample 6 is tested through ultrasonic waves, and the temperature and humidity of the concrete during solidification are monitored through the copper-nickel temperature sensor 51, then the relationship between the low temperature and the strength of the concrete test sample 6 is analyzed according to the test data, and the data is calculated through a formula, and the formula is as follows:

[0052]

[0053]

[0054] In the formula, f cu The compressive strength; f t The tensile strength, A1, b1, A2, b2 are constant coefficients, which are obtained through tests, and v is the elastic wave velocity.

[0055] Meanwhile, the contents not described in detail in the specification all belong to the prior art known by those skilled in the art.

[0056] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the application. The scope of the application is not to be limited by the embodiments shown and described, but only by the claims and their equivalents.

Claims

1. A device for testing the strength of high-strength concrete in a low-temperature environment, characterized by: The utility model relates to a concrete strength test device, including: a loading barrel (2) for providing a test environment; a test mechanism arranged on the body of the loading barrel (2), the test mechanism comprising an upper flange (1) and a lower flange (3), the outer surfaces of the upper flange (1) and the lower flange (3) are respectively embedded in active connection with the two sides inside the loading barrel (2), support is provided through the flange body, an ultrasonic wave transmitting probe (71) is arranged inside the upper flange (1), an ultrasonic wave receiving probe (72) is arranged inside the lower flange (3), a concrete sample (6) is arranged between the outer surfaces of the ultrasonic wave transmitting probe (71) and the ultrasonic wave receiving probe (72), the strength of the concrete sample (6) is tested by penetrating the concrete sample (6) with ultrasonic waves, a spiral pipe (41) is arranged between the upper flange (1) and the lower flange (3), the spiral pipe (41) is sleeved outside the loading barrel (2), and a low-temperature environment is provided for the loading barrel (2) by flowing refrigerant inside the spiral pipe (41); a heat preservation assembly (8) arranged outside the spiral pipe (41) to provide a heat preservation environment outside the spiral pipe (41); the heat preservation assembly (8) comprises an inner cylinder (81) sleeved outside the spiral pipe (41), a clamping unit (82) is arranged outside the inner cylinder (81), the clamping unit (82) comprises two sealing rings (821), the outer surfaces of the two sealing rings (821) are both in active connection with the inside of an outer cylinder (83), the two sides of the outer surfaces of the sealing rings (821) are both in active connection with the inner cylinder (81) and the outer cylinder (83), and the outer surfaces of the two sides of the sealing rings (821) are both in fixed connection with the inner cylinder (81) and the outer cylinder (83). chamfers are arranged on the sealing rings (821) and the clamping units (82), and the chamfers are obliquely extruded.

2. The high-strength concrete strength testing device in a low-temperature environment according to claim 1, characterized in that: a refrigeration station (4), a monitoring data acquisition instrument (5), and an ultrasonic wave transmitter (7) are arranged outside the loading barrel (2), the output ends of the refrigeration station (4) are in communication with the two ends of the spiral pipe (41), data receiving connectors (32) and ultrasonic receiving connectors (31) are respectively embedded and fixedly connected to the two sides of the arc edge of the lower flange (3), the input end of the ultrasonic receiving connector (31) is in electric connection with the output end of the ultrasonic wave receiving probe (72), the output end of the ultrasonic receiving connector (31) is in electric connection with the input end of the ultrasonic wave transmitter (7), the input end of the data receiving connector (32) is in electric connection with a copper-nickel temperature sensor (51), the copper-nickel temperature sensor (51) is arranged inside the loading barrel (2), the output end of the data receiving connector (32) is in electric connection with the input end of the monitoring data acquisition instrument (5), and the output end of the ultrasonic wave transmitter (7) is in electric connection with the input end of the ultrasonic wave transmitting probe (71).

3. The high-strength concrete strength testing device in a low-temperature environment according to claim 1, characterized in that: The outer surface of the inner cylinder (81) is movably connected with the outer surfaces of the upper flange (1) and the lower flange (3), respectively, an outer cylinder (83) is sleeved outside the inner cylinder (81), a fixed ring (84) is fixedly connected with the outer surface of the inner cylinder (81), the outer surface of the fixed ring (84) is fixedly connected with the inner part of the outer cylinder (83), and a silver plating layer (85) is arranged on the inner wall of the inner cylinder (81).

4. The high-strength concrete strength testing device in a low-temperature environment according to claim 3, characterized in that: The body of the fixed ring (84) is provided with a longitudinal air hole (86), the body of the outer cylinder (83) is fixedly connected with an air pipe (87), the inner part of the air pipe (87) is fixedly connected with a fan (88), and the body of the outer cylinder (83) is fixedly connected with two heat preservation pipes (89), one end of each of the two heat preservation pipes (89) is fixedly connected with the body of the inner cylinder (81) and extends into the inner cylinder (81), and the two heat preservation pipes (89) are used for heat preservation at the connection between the spiral pipe (41) and the refrigeration station (4).

5. The high-strength concrete strength testing device in a low-temperature environment according to claim 4, characterized in that: The outer surface of the sealing ring (821) is provided with a groove (823), the inner part of the groove (823) is fixedly connected with an extension rod (824), the outer surface of the extension rod (824) is fixedly connected with a clamping ring (826), and the outer surfaces of the two clamping rings (826) are fixedly connected with the outer surfaces of the upper flange (1) and the lower flange (3), respectively.

6. The high-strength concrete strength testing device in a low-temperature environment according to claim 5, characterized in that: The body of the extension rod (824) is provided with a pressure regulating module (825), the pressure regulating module (825) comprises a compression spring (8251), the compression spring (8251) is sleeved outside the extension rod (824), one end of the compression spring (8251) is fixedly connected with the inner part of the groove (823), the other end of the compression spring (8251) is fixedly connected with a pushing ring (8252), the pushing ring (8252) is sleeved outside the extension rod (824), the outer surface of the pushing ring (8252) is movably connected with the inner part of the groove (823), the outer surface of the pushing ring (8252) is provided with a rotating groove (8253), the inner part of the rotating groove (8253) is rotatably connected with a rotating ring (8254), the outer surface of the rotating ring (8254) is fixedly connected with a nut (8255), and the ring of the nut (8255) is threadedly connected with the outer surface of the extension rod (824).

7. A method for testing the strength of high-strength concrete in a low-temperature environment, using the high-strength concrete strength testing device in a low-temperature environment according to claim 6, characterized in that: Specifically comprising the following steps: Step one, connect the loading barrel (2) with the lower flange (3), then electrically connect the data receiving connector (32) with the copper-nickel temperature sensor (51) and the monitoring data acquisition instrument (5), respectively, then electrically connect the ultrasonic receiving connector (31) with the ultrasonic receiving probe (72) and the ultrasonic transmitter (7), then sleeve the spiral pipe (41) outside the loading barrel (2), place the outer cylinder (83) on the lower flange (3) through abutting with one side of the clamping ring (826), place the conduit inside the heat preservation pipe (89), and connect the refrigeration station (4) and the spiral pipe (41); Step two, pouring the concrete to be tested into the inside of the loading barrel (2) to form a concrete sample (6), and electrically connecting the ultrasonic transmitter (7) with the ultrasonic transmitting probe (71), then assembling the upper flange (1) with the loading barrel (2), and closing the upper part of the outer cylinder (83) by abutting the other side of the ring (822) with the outer cylinder (83), then the fan (88) extracts the air inside the outer cylinder (83) and removes it, when the inside of the outer cylinder (83) is in a vacuum state, the outer end of the air pipe (87) is closed; Step three, in the setting stage of the concrete sample (6), different low temperature environments are provided for its testing process through the refrigeration station (4) and the spiral pipe (41), at the same time, the hardness is tested through ultrasonic waves, and the temperature of the concrete during setting is monitored through the copper-nickel temperature sensor (51), then the relationship between low temperature and the strength of the concrete sample (6) is analyzed according to the test data.

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