Device and method for testing strength of high-strength concrete in low-temperature environment

Abstract

The invention discloses a device and a method for testing the strength of high-strength concrete in a low-temperature environment. The device comprises a loading barrel for providing a testing environment; the testing mechanism is arranged on a body of the loading barrel, the testing mechanism comprises an upper flange and a lower flange, the outer surfaces of the upper flange and the lower flange are movably connected with the two sides of the interior of the loading barrel in an embedded mode respectively, support is provided through a flange plate body, an ultrasonic transmitting probe is arranged in the upper flange, and the ultrasonic transmitting probe is arranged in the lower flange. The concrete strength testing device relates to the technical field of concrete, and solves the problems that when an existing concrete strength testing device is used, only strength testing can be carried out on solidified concrete, so that the use range is limited, meanwhile, external thermal insulation equipment is easily damaged due to the fact that testing is carried out in a loading mode, and the testing efficiency is high. And the requirement on the compression resistance of the device is high, so that the manufacturing cost of the device is reduced.

Description

Technical Field

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

[0002] At present, the method of freezing concrete samples and then taking them out to room temperature for strength testing is prone to uneven sample temperature, resulting in inaccurate test results. The invention patent with application number CN201310673956.3 discloses a device and test method for concrete splitting strength test in ultra-low temperature environment, including a universal testing machine and a low-temperature box placed between the upper and lower pressure plates of the universal testing machine. The device has good integrity, simple structure and convenient disassembly, and the test method is simple and easy to operate, which ensures efficiency and 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 solidified concrete blocks and can only test the strength properties of concrete, which limits its actual scope of use.

[0005] 2) When the device is testing concrete blocks, it not only easily causes damage to the external insulation equipment through impact and splitting, but also places high requirements on the overall compressive performance of the device, thereby increasing the manufacturing cost of the device.

[0006] Therefore, it is necessary to solve the problems that still exist in the above-mentioned device. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a high-strength concrete strength testing device and method under low temperature environment, which solves the problem that the existing concrete strength testing device can only perform strength tests on solidified concrete, resulting in a limited scope of use, and the test is carried out by loading, which easily causes damage to external insulation equipment, and the compressive performance of the device is required to be high, thereby increasing the manufacturing cost of the device.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-strength concrete strength test device under low temperature environment, comprising:

[0009] A loading bucket for providing a test environment;

[0010] A testing mechanism, the testing mechanism is arranged on the body of the loading bucket, the testing 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 of the loading bucket, and support is provided by the flange body, an ultrasonic transmitting probe is arranged inside the upper flange, an ultrasonic receiving probe is arranged inside the lower flange, a sample is arranged between the outer surfaces of the ultrasonic transmitting probe and the ultrasonic receiving probe, and the strength test of the concrete sample is performed by ultrasonic wave penetrating the concrete sample, a spiral tube is arranged between the upper flange and the lower flange, the spiral tube is sleeved on the outside of the loading bucket, and a refrigerant flows inside the spiral tube to provide a low temperature environment for the loading bucket;

[0011] The heat-insulating component is arranged outside the spiral tube to provide a heat-insulating environment for the outside of the spiral tube.

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

[0013] Preferably, the insulation component includes an inner cylinder, which is sleeved on the outside of the spiral tube, and the two sides of the outer surface of the inner cylinder are movably connected to the outer surfaces 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 fixing ring, the outer surface of the fixing ring is fixedly connected to the inside of the outer cylinder, and the inner wall of the inner cylinder is provided with a silver-plated layer.

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

[0015] Preferably, a locking unit is provided on the outside of the inner tube, and the locking unit includes two sealing rings, and the outer surfaces of the two sealing rings are movably connected to the inside of the outer tube, and both sides of the outer surface of the sealing rings are movably connected with abutment rings, and the outer surfaces of the abutment rings on both sides are fixedly connected to the inside of the outer tube and the outer surface of the inner tube respectively.

[0016] Preferably, a groove is provided on the outer surface of the sealing ring, a telescopic rod is fixedly connected inside the groove, a clamping ring is fixedly connected to the outer surface of the telescopic rod, and the outer surfaces of the clamping rings on both sides are fixedly connected to the outer surfaces of the upper flange and the lower flange respectively.

[0017] Preferably, a voltage regulating module is provided on the main body of the telescopic rod, and the voltage regulating module includes a compression spring, which is sleeved on the outside of the telescopic rod, one end of the compression spring is fixedly connected to the inside of the groove, and the other end of the compression spring is fixedly connected to a push ring, which is sleeved on the outside of the telescopic rod, and the outer surface of the push ring is movably connected to the inside of the groove. A rotating groove is provided on the outer surface of the push ring, and a rotating ring is rotatably connected to the inside of the rotating groove, and a nut is fixedly connected to the outer surface of the rotating ring, and the ring of the nut is threadedly connected to the outer surface of the telescopic rod.

[0018] The present invention also discloses a high-strength concrete strength test method under low temperature environment, which specifically comprises the following steps:

[0019] Step 1, connect the loading bucket 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 tube on the outside of the loading bucket, and place the outer tube on the lower flange by abutting against the clamping ring on one side, and place the conduit inside the insulation tube, and connect the refrigeration station and the spiral tube;

[0020] Step 2: Pour the concrete to be tested inside the loading bucket to form a sample, and electrically connect the ultrasonic transmitter to the ultrasonic transmitter probe, then assemble the upper flange to the loading bucket, and seal the top of the outer cylinder by abutting the other side of the ring with the outer cylinder, and then use the fan to extract the air inside the outer cylinder and exhaust it. When the inside of the outer cylinder is in a vacuum state, the outer end of the air pipe is sealed;

[0021] Step 3: During the solidification stage of the concrete sample, different low-temperature environments are provided for the test process through the refrigeration station and spiral tube. At the same time, its hardness is tested by ultrasound, and the temperature and humidity of the concrete during solidification are monitored by the copper-nickel temperature sensor. Then, the relationship between low temperature and the strength of the concrete sample is analyzed based on the test data.

[0022] Beneficial Effects

[0023] The present invention provides a high-strength concrete strength test device and method under low temperature environment. Compared with the prior art, it has the following beneficial effects:

[0024] (1) By setting up a testing mechanism and pouring concrete into a loading bucket, an ultrasonic transmitting probe and an ultrasonic receiving probe can be used to both load the concrete and detect the strength change of the concrete during the solidification process in a low-temperature environment through the transmission speed of the ultrasonic wave. The temperature and humidity of the concrete can also be monitored, so that the concrete can be fully tested without causing damage to the equipment, and the use and maintenance costs of the device are also reduced.

[0025] (2) By setting up a heat preservation component, an annular space can be provided on the periphery of the spiral tube by using the inner tube and the outer tube, and the heat preservation performance can be improved by vacuuming, thereby reducing the energy loss of the spiral tube when providing low temperature. The silver-plated layer can also reduce the radiation loss energy and make the temperature inside the inner tube balanced, thereby improving the accuracy of the test results.

[0026] (3) By setting a locking unit and utilizing the locking connection between the retaining ring and the outer tube, the positions of the outer tube and the inner tube can be fixed and the connection and sealing can be achieved. In the process of vacuuming, the sealing ring and the retaining rings on both sides are connected to further improve the sealing of the two sides of the vacuum environment.

[0027] (4) By setting up a pressure regulating module and a compression spring, the sealing ring can be easily reset. At the same time, the nut is moved along the telescopic rod so that the push ring can slide along to adjust the distance between the two ends of the compression spring. Thus, the elastic force of the compression spring can be adjusted according to actual usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the internal structure of the present invention;

[0029] Figure 2 It is a three-dimensional diagram of the external structure of the present invention;

[0030] Figure 3 It is a three-dimensional diagram of the internal structure of the outer cylinder of the present invention;

[0031] Figure 4 The figure is a three-dimensional diagram of the external structure of the sealing ring of the present invention;

[0032] Figure 5 It is a stereoscopic diagram of the internal structure of the push ring of the present invention.

[0033] In the figure: 1. upper flange; 2. loading barrel; 3. lower flange; 31. ultrasonic receiving connector; 32. data receiving connector; 4. refrigeration station; 41. spiral tube; 5. monitoring data acquisition instrument; 51. copper-nickel temperature sensor; 6. sample; 7. ultrasonic transmitter; 71. ultrasonic transmitting probe; 72. ultrasonic receiving probe; 8. insulation component; 81. inner tube; 82. positioning unit; 821. sealing ring; 822. retaining 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. retaining ring; 83. outer tube; 84. fixing ring; 85. silver plating layer; 86. air hole; 87. air pipe; 88. fan; 89. insulation tube. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-5 , the present invention provides a technical solution: a high-strength concrete strength test device under low temperature environment:

[0036] Embodiment 1: Refer to the attached manual Figure 1 , Attachment Figure 2 ;

[0037] The utility model comprises a loading barrel 2, wherein a testing mechanism is arranged outside the loading barrel 2, and the testing mechanism comprises an upper flange 1 and a lower flange 3, wherein the outer surfaces of the upper flange 1 and the lower flange 3 are respectively embedded and movably connected with the two sides inside the loading barrel 2, a spiral tube 41 is arranged between the upper flange 1 and the lower flange 3, and the spiral tube 41 is sleeved on the outside of the loading barrel 2, and an insulation component 8 is arranged outside the spiral tube 41, an ultrasonic transmitting probe 71 is arranged inside the upper flange 1, and an ultrasonic receiving probe 72 is arranged inside the lower flange 3, and a sample 6 is arranged between the outer surfaces of the ultrasonic transmitting probe 71 and the ultrasonic receiving probe 72, and the strength test of the concrete sample 6 is performed by ultrasonic wave penetrating the concrete sample 6, and a refrigeration station 4, a monitoring data acquisition instrument 5 and an ultrasonic transmitter 7 are respectively arranged outside the loading barrel 2, and the ultrasonic transmitter 7 adopts a model of DPR500, and the monitoring data acquisition instrument 5 adopts a model of HGPt-Co-S100, made of The cold station 4 is made of an existing compressor. The output end and the output end of the cold station 4 are respectively connected to the two ends of the spiral tube 41. The two sides of the arc edge of the lower flange 3 are respectively embedded with a data receiving connector 32 and an ultrasonic receiving connector 31. The two sides of the lower flange 3 body are provided with right-angle connection channels to provide stable support for the bottom of the plate. The input end of the ultrasonic receiving connector 31 is electrically connected to the output end of the ultrasonic receiving probe 72, and the output end of the ultrasonic receiving connector 31 is electrically connected to the input end of the ultrasonic transmitter 7. The input end of the data receiving connector 32 is electrically connected to a copper-nickel temperature sensor 51, which is also called a T-type thermocouple. The model used is WJ127. The copper-nickel temperature sensor 51 is arranged inside the loading bucket 2. The output end of the data receiving connector 32 is electrically connected to the input end of the monitoring data acquisition instrument 5, and the output end of the ultrasonic transmitter 7 is electrically connected to the input end of the ultrasonic transmitting probe 71.

[0038] In this embodiment, the lower flange 3 is first assembled with the loading bucket 2, and then the concrete to be tested is poured inside the loading bucket 2 to form a sample 6, and then the upper flange 1 is assembled with the loading bucket 2, and then a low-temperature test environment is provided for the sample 6 through the refrigeration station 4 and the spiral tube 41. At the same time, during its solidification process, the ultrasonic transmitter 7, the ultrasonic transmitting probe 71, the ultrasonic receiving probe 72 and the ultrasonic receiving connector 31 are cooperated to detect the strength of the sample 6 through the ultrasonic detection technology, and the temperature and humidity data of the sample 6 are collected by using the data receiving connector 32, the copper-nickel temperature sensor 51 and the monitoring data acquisition instrument 5.

[0039] Embodiment 2: Based on Embodiment 1, refer to the attached Figure 2 , Attachment Figure 3 ;

[0040] The heat preservation component 8 includes an inner cylinder 81, which is sleeved on the outside of the spiral tube 41. The two sides of the outer surface of the inner cylinder 81 are movably connected to the outer surfaces of the upper flange 1 and the lower flange 3 respectively. The outer cylinder 83 is sleeved on the outside of the inner cylinder 81. The outer cylinder 83 and the inner cylinder 81 are made of materials that are resistant to pressure, wear-resistant, heat-insulating and have good sealing properties. The outer surface of the inner cylinder 81 is fixedly connected with a fixing ring 84, which is used to fix the outer cylinder 83 and the inner cylinder 81. The outer surface of the fixing ring 84 is fixedly connected with the inside of the outer cylinder 83. The inner wall of the inner cylinder 81 is provided with a silver-plated layer 85, and the body of the fixing ring 84 is provided with a longitudinally penetrating air hole 86, a plurality of air holes 86 are arranged at equal angles, which are used to communicate the upper and lower spaces between the outer tube 83 and the inner tube 81. An air pipe 87 is fixedly connected to the body of the outer tube 83, and a valve for sealing can be provided on the air pipe 87. A fan 88 is fixedly connected to the inside of the air pipe 87. The fan 88 is made of an existing exhaust fan and is electrically connected to an external control circuit. Two insulation pipes 89 are fixedly connected to the body of the outer tube 83, and one end of the two insulation pipes 89 is fixedly connected to the body of the inner tube 81 and extends to the inside of the inner tube 81. The two insulation pipes 89 are used for insulation at the connection between the spiral tube 41 and the refrigeration station 4.

[0041] In this embodiment, the combination of the inner cylinder 81 and the outer cylinder 83 is sleeved on the outside of the spiral tube 41 and sealed by contact with the upper flange 1 and the lower flange 3. Then the fan 88 works to discharge the air between the inner cylinder 81 and the outer cylinder 83 through the air pipe 87, thereby forming a circle of vacuum space to keep the spiral tube 41 warm. After the vacuuming is completed, the valve is closed to seal the inside of the air pipe 87, and then the fan 88 stops working. By setting the silver-plated layer 85, the radiation heat loss can be reduced and the temperature inside the inner cylinder 81 can be balanced, thereby improving the accuracy of the test results.

[0042] Embodiment 3: Based on Embodiment 2, refer to the attached Figure 2 , Attachment Figure 4 ;

[0043] The inner tube 81 is provided with a positioning unit 82 on the outside. The positioning unit 82 includes two sealing rings 821. The sealing rings 821 are made of the same material as the outer tube 83, and two edges and corners on one side are both provided with chamfers. The outer surfaces of the two sealing rings 821 are both movably connected to the inner part of the outer tube 83. Both sides of the outer surface of the sealing ring 821 are movably connected with a retaining ring 822. The retaining ring 822 is made of the same material as the sealing ring 821, and the side in contact with the sealing ring 821 is also provided with a chamfer. At the same time, the oblique extrusion between the chamfers further improves the sealing performance. The retaining rings 822 on both sides are The outer surface is fixedly connected to the interior of the outer cylinder 83 and the outer surface of the inner cylinder 81 respectively. A groove 823 is provided on the outer surface of the sealing ring 821. A telescopic rod 824 is fixedly connected to the interior of the groove 823. The telescopic rod 824 can support, limit and guide the movement of the sealing ring 821. A clamping ring 826 is fixedly connected to the outer surface of the telescopic rod 824. The clamping ring 826 is made of the same material as the sealing ring 821, and its width is the same as the distance between the inner cylinder 81 and the outer cylinder 83. The outer surfaces of the clamping rings 826 on both sides are fixedly connected to the outer surfaces of the upper flange 1 and the lower flange 3 respectively.

[0044] In this embodiment, the outer cylinder 83 can be positioned and retained during assembly by the retaining ring 826. During the vacuuming process, the sealing rings 821 on both sides move closer to each other due to the negative pressure, so that the sealing performance on both sides of the vacuuming area is enhanced through the oblique abutment of the chamfers between the sealing rings 821 and the abutment rings 822 on both sides.

[0045] Embodiment 4: Based on Embodiment 3, refer to the attached Figure 4 , Attachment Figure 5 ;

[0046] The main body of the telescopic rod 824 is provided with a pressure regulating module 825, which includes a compression spring 8251. The compression spring 8251 can maintain the contact between the sealing ring 821 and the push ring 822 through the elastic force. The compression spring 8251 is sleeved on the outside of the telescopic rod 824. One end of the compression spring 8251 is fixedly connected to the inside of the groove 823. The other end of the compression spring 8251 is fixedly connected to a push ring 8252. The push ring 8252 can support the compression spring 8251. The ring 8252 is sleeved on the outside of the telescopic rod 824, and the outer surface of the push ring 8252 is movably connected to the inside of the groove 823. The outer surface of the push ring 8252 is provided with a rotating groove 8253, and the inside of the rotating groove 8253 is rotatably connected to a swivel 8254. The cross-section of the swivel 8254 is T-shaped to improve the stability of the connection. The outer surface of the swivel 8254 is fixedly connected to a nut 8255, and the ring of the nut 8255 is threadedly connected to the outer surface of the telescopic rod 824.

[0047] In this embodiment, by rotating the nut 8255 and through its threaded connection with the surface of the telescopic rod 824, it is made to move axially along the telescopic rod 824. At the same time, through the connection between the swivel ring 8254 and the push ring 8252, the push ring 8252 drives one end of the compression spring 8251 to follow the synchronous movement, thereby adjusting the distance between the two ends of the compression spring 8251 and adjusting the elastic force of the compression spring 8251, so that the sealing ring 821 can maintain contact with the push ring 822.

[0048] The present invention also discloses a high-strength concrete strength test method under low temperature environment, which specifically comprises the following steps:

[0049] Step 1, connect the loading bucket 2 with the lower flange 3, and then electrically connect the data receiving connector 32 with the copper-nickel temperature sensor 51 and the monitoring data acquisition instrument 5 respectively, and then electrically connect the ultrasonic receiving connector 31 with the ultrasonic receiving probe 72 and the ultrasonic transmitter 7 respectively, and then sleeve the spiral tube 41 on the outside of the loading bucket 2, and place the outer tube 83 on the lower flange 3 by abutting against the one side clamp ring 826, and place the conduit inside the insulation tube 89, and connect the refrigeration station 4 and the spiral tube 41;

[0050] Step 2: Pour the concrete to be tested inside the loading bucket 2 to form a sample 6, and electrically connect the ultrasonic transmitter 7 to the ultrasonic transmitter probe 71, then assemble the upper flange 1 to the loading bucket 2, and at the same time, seal the top of the outer cylinder 83 by abutting the other side of the ring 822 with the outer cylinder 83, and then the fan 88 extracts and exhausts the air inside the outer cylinder 83. When the outer cylinder 83 is in a vacuum state, the outer end of the air pipe 87 is sealed;

[0051] Step 3: During the solidification stage of the concrete sample 6, different low temperature environments are provided for the test process through the refrigeration station 4 and the spiral tube 41, and the hardness is tested by ultrasound, and the temperature and humidity of the concrete during solidification are monitored by the copper-nickel temperature sensor 51. Then, the relationship between the low temperature and the strength of the concrete sample 6 is analyzed based on the test data, and the data is calculated by the formula, which is as follows:

[0052]

[0053]

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

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

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength concrete strength test device under low temperature environment, characterized in that: include: A loading bucket (2) for providing a test environment; A testing mechanism, the testing mechanism is arranged on the body of the loading bucket (2), 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 the two sides of the loading bucket (2), and support is provided by the flange body, the upper flange (1) is provided with an ultrasonic transmitting probe (71), the lower flange (3) is provided with an ultrasonic receiving probe (72), a sample (6) is arranged between the outer surfaces of the ultrasonic transmitting probe (71) and the ultrasonic receiving probe (72), and the strength test of the concrete sample (6) is performed by ultrasonic wave penetrating the concrete sample (6), a spiral tube (41) is arranged between the upper flange (1) and the lower flange (3), the spiral tube (41) is sleeved on the outside of the loading bucket (2), and a refrigerant flows inside the spiral tube (41) to provide a low temperature environment for the loading bucket (2); A heat-insulating component (8) is arranged outside the spiral tube (41) to provide a heat-insulating environment for the outside of the spiral tube (41).

2. A high-strength concrete strength test device under low temperature environment according to claim 1, characterized in that: A refrigeration station (4), a monitoring data acquisition instrument (5) and an ultrasonic transmitter (7) are respectively arranged outside the loading bucket (2); the output end and the output end of the refrigeration station (4) are respectively connected to the two ends of the spiral tube (41); a data receiving connector (32) and an ultrasonic receiving connector (31) are respectively embedded and fixedly connected on both sides of the arc edge of the lower flange (3); the input end of the ultrasonic receiving connector (31) is electrically connected to the output end of the ultrasonic receiving probe (72); the output end of the ultrasonic receiving connector (31) is electrically connected to the input end of the ultrasonic transmitter (7); the input end of the data receiving connector (32) is electrically connected to a copper-nickel temperature sensor (51); the copper-nickel temperature sensor (51) is arranged inside the loading bucket (2); the output end of the data receiving connector (32) is electrically connected to the input end of the monitoring data acquisition instrument (5); the output end of the ultrasonic transmitter (7) is electrically connected to the input end of the ultrasonic transmitting probe (71).

3. The high-strength concrete strength test device under low temperature environment according to claim 1, characterized in that: The heat preservation component (8) comprises an inner tube (81), the inner tube (81) is sleeved on the outside of the spiral tube (41), the two sides of the outer surface of the inner tube (81) are movably connected to the outer surfaces of the upper flange (1) and the lower flange (3), respectively, the outer surface of the inner tube (81) is sleeved with an outer tube (83), the outer surface of the inner tube (81) is fixedly connected with a fixing ring (84), the outer surface of the fixing ring (84) is fixedly connected with the inside of the outer tube (83), and the inner wall of the inner tube (81) is provided with a silver-plated layer (85).

4. The high-strength concrete strength test device under low temperature environment according to claim 3, characterized in that: The body of the fixed ring (84) is provided with a longitudinally penetrating air hole (86); the body of the outer tube (83) is penetrated and fixedly connected with an air pipe (87); the interior of the air pipe (87) is fixedly connected with a fan (88); the body of the outer tube (83) is penetrated and fixedly connected with two insulation pipes (89); one end of the two insulation pipes (89) is penetrated and fixedly connected with the body of the inner tube (81) and extends to the interior of the inner tube (81); the two insulation pipes (89) are used for insulation at the connection between the spiral tube (41) and the refrigeration station (4).

5. The high-strength concrete strength test device under low temperature environment according to claim 3, characterized in that: A locking unit (82) is provided on the outside of the inner cylinder (81), and the locking unit (82) includes two sealing rings (821), and the outer surfaces of the two sealing rings (821) are movably connected to the inside of the outer cylinder (83), and both sides of the outer surface of the sealing ring (821) are movably connected to a retaining ring (822), and the outer surfaces of the retaining rings (822) on both sides are fixedly connected to the inside of the outer cylinder (83) and the outer surface of the inner cylinder (81), respectively.

6. A high-strength concrete strength test device under low temperature environment according to claim 5, characterized in that: The outer surface of the sealing ring (821) is provided with a groove (823), the interior of the groove (823) is fixedly connected to a telescopic rod (824), the outer surface of the telescopic rod (824) is fixedly connected to a clamping ring (826), and the outer surfaces of the clamping rings (826) on both sides are respectively fixedly connected to the outer surfaces of the upper flange (1) and the lower flange (3).

7. The high-strength concrete strength test device under low temperature environment according to claim 6, characterized in that: A voltage regulating module (825) is provided on the body of the telescopic rod (824), and the voltage regulating module (825) includes a compression spring (8251), which is sleeved on the outside of the telescopic rod (824), one end of the compression spring (8251) is fixedly connected to the inside of the groove (823), and the other end of the compression spring (8251) is fixedly connected to a push ring (8252), which is sleeved on the outside of the telescopic rod (824), and the outer surface of the push ring (8252) is movably connected to the inside of the groove (823), and the outer surface of the push ring (8252) is provided with a rotating groove (8253), and the inside of the rotating groove (8253) is rotatably connected to a rotating ring (8254), and the outer surface of the rotating ring (8254) is fixedly connected to a nut (8255), and the ring of the nut (8255) is threadedly connected to the outer surface of the telescopic rod (824).

8. A method for testing the strength of high-strength concrete in a low-temperature environment, using a high-strength concrete strength testing device in a low-temperature environment as claimed in any one of claims 1 to 7, characterized in that: The specific steps include: Step 1: Connect the loading bucket (2) to the lower flange (3), and then electrically connect the data receiving connector (32) to the copper-nickel temperature sensor (51) and the monitoring data acquisition instrument (5), and then electrically connect the ultrasonic receiving connector (31) to the ultrasonic receiving probe (72) and the ultrasonic transmitter (7), and then sleeve the spiral tube (41) on the outside of the loading bucket (2), and place the outer tube (83) on the lower flange (3) by abutting against the clamping ring (826) on one side, and place the conduit inside the insulation tube (89), and connect the refrigeration station (4) and the spiral tube (41); Step 2: pour the concrete to be tested inside the loading bucket (2) to form a sample (6), and electrically connect the ultrasonic transmitter (7) to the ultrasonic transmitter probe (71), then assemble the upper flange (1) to the loading bucket (2), and at the same time, seal the top of the outer tube (83) by abutting the other side abutment ring (822) with the outer tube (83), and then use the fan (88) to extract and discharge the air inside the outer tube (83). When the inside of the outer tube (83) is in a vacuum state, the outer end of the air pipe (87) is sealed; Step 3: During the solidification stage of the concrete sample (6), different low-temperature environments are provided for the test process through the refrigeration station (4) and the spiral tube (41), and the hardness is tested by ultrasound. The temperature and humidity of the concrete during solidification are monitored by the copper-nickel temperature sensor (51), and then the relationship between the low temperature and the strength of the concrete sample (6) is analyzed based on the test data.

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