Airport pavement concrete stress-strain state acquisition device

Abstract

The utility model discloses an airport pavement concrete stress-strain state acquisition device. The airport pavement concrete stress-strain state acquisition device is characterized in that a water storage tank is externally connected with a water circulation device; the test piece placing device is arranged on the water storage tank, the aircraft impact load test device is arranged above the space of the test piece placing device, the water circulation device is used for cooling the aircraft impact load test device and applying water pressure to a concrete test piece in the test piece placing device, and the sensing device is externally connected with a data acquisition end. The data acquisition end is connected with the control end; the control end controls the opening and closing states of the aircraft impact load test device and the water circulation device; the control end records state information of the aircraft impact load test device, the water circulation device and the sensor device. The aircraft impact load test device, the test piece placing device, the water circulating device and the sensing device are not interfered with one another, water entering the test piece groove enters the water storage tank through the steel plate with holes, and the problems of water leakage and water recycling of a traditional environment box are solved.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical design and relates to a device for collecting stress and strain states of airport pavement concrete. Background Art

[0002] At present, the main factor considered in the domestic pavement design specifications is the load effect. During the service period, the pavement is subjected to long-term adverse effects such as aircraft impact load, high temperature of aircraft tail nozzle, ambient temperature change, dynamic water scouring on the road surface, ion erosion, etc., which leads to the loss of pavement surface function, strength attenuation, and internal cracks, which seriously affect its service performance. The design ignores the influence of dynamic water scouring and ion erosion on the performance of pavement concrete, which also explains the phenomenon that the actual service life of some domestic pavements is lower than the design life.

[0003] In order to simulate the performance of pavement concrete under the coupling of long-term load and natural environment, researchers designed and completed the test device and test method for the impact and wear of aircraft load on airport pavement for the first time. Since then, load dynamic water temperature coupling chambers have been used to further improve the simulation of the actual pavement working environment. However, there is a serious water leakage in the water circulation device during actual operation, and the dynamic water flushing pressure and the pressure applied by the aircraft wheel load are not accurately controlled and cannot be adjusted in real time, and it is impossible to accurately simulate the multi-field nonlinear coupling existing in the actual pavement. At the same time, the existing various environmental chambers cannot monitor the stress, strain and humidity changes inside the test specimens in real time, and lack the influence of ion corrosion environment and high temperature erosion on concrete. After the wheel load and the environment, the test specimens need to be tested through subsequent supplementary tests to measure the mechanical properties of the pavement concrete. Therefore, it is impossible to monitor the changes in internal stress and strain of the pavement concrete under multi-field coupling conditions and the redistribution of water after migration in real time. The existing instruments for simulating aircraft impact loads only consider the influence of factors such as aircraft impact speed and landing altitude on the performance of concrete, and ignore the influence of high temperature erosion of the aircraft tail nozzle on concrete. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the existing indoor test equipment cannot accurately simulate the multi-field nonlinear coupling effect existing on the actual road surface, and to monitor the stress, strain and temperature changes inside the concrete specimen, especially the lack of consideration of the factors affecting the concrete due to the ion corrosion environment and high-temperature erosion, and the neglect of the impact of the high-temperature burning effect of the aircraft tail nozzle on the concrete. A device for collecting the stress and strain state of airport pavement concrete is provided.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A device for collecting stress and strain states of airport pavement concrete, comprising: a data collection terminal, a support, a water storage tank, a shell, an aircraft impact load test device, a specimen placement device, a water circulation device and a sensor device;

[0007] A water storage tank is arranged on a support, and an external water circulation device is connected to the water storage tank; a specimen placement device is arranged on the water storage tank, an aircraft impact load test device is arranged above the space of the specimen placement device, the aircraft impact load test device is arranged inside a shell, a water circulation device is arranged on the aircraft impact load test device, and is used to cool the aircraft impact load test device and apply water pressure to a concrete specimen in the specimen placement device; a sensor device is arranged inside the shell, and the sensor device is externally connected to a data acquisition terminal, and a visual window is arranged on the shell; the data acquisition terminal is connected to a control terminal; the control terminal is connected to an electric device, and the electric device supplies power to the data acquisition terminal and the control terminal; the control terminal controls the opening and closing states of the aircraft impact load test device and the water circulation device; the control terminal records the state information of the aircraft impact load test device, the water circulation device and the sensor device.

[0008] The further improvement of the utility model is:

[0009] Furthermore, the specimen placement device includes: a specimen slot, a bracket, a joystick, a three-speed limit rod and a longitudinal limit device; one side of the specimen slot is a movable steel plate; the other side of the specimen slot is a threadable steel plate; the three-speed limit rod is arranged at one end of the specimen slot, and the two ends of the three-speed limit rod are respectively connected to the movable steel plate and the threadable steel plate; the joystick is welded to the longitudinal limit device; the longitudinal limit device is connected to the movable steel plate; the bracket is arranged at the bottom of the specimen slot, and a perforated steel plate is arranged between the bracket and the water tank; the concrete specimen is placed inside the specimen slot; the operating end of the joystick is arranged at the outer end of the shell, and a movable slot is arranged on the shell for the operating end of the joystick to move freely at the outer end of the shell.

[0010] Furthermore, the third-speed limit rod includes a first telescopic shaft, a second telescopic shaft and a cylinder; the first telescopic shaft can be retracted into the second telescopic shaft, and the second telescopic shaft can be retracted into the cylinder. A slot is provided between the cylinder and the second telescopic shaft, and between the first telescopic shaft and the second telescopic shaft. The slot is used to install a limit pile to prevent the first telescopic shaft and the second telescopic shaft from retracting.

[0011] Furthermore, the aircraft impact load test device includes: a track, a cylinder, a tail flame nozzle, a straight rod, a wheel, an ignition device, a fixed bracket and a pulley assembly; both ends of the track are fixed inside the shell, and the two tracks are arranged opposite to each other; the pulley assembly includes a pulley and a connecting rod; pulleys are arranged at both ends of the connecting rod; the pulley is arranged in the groove of the track; a fixed rod is arranged between the two connecting rods; the cylinder is fixedly arranged on the fixed rod; one end of the cylinder is connected to the end point of the straight rod; the straight rod moves up and down driven by the inner shaft of the cylinder; the wheel is fixedly connected to the straight rod; the tail flame nozzle is arranged on the straight rod, the tail flame nozzle is connected to the ignition device, and the ignition device is arranged on the straight rod; one end of the fixed bracket is connected to the wheel; the other end of the fixed bracket is connected to the straight rod.

[0012] Furthermore, the water circulation device includes: a disc-shaped water inlet, a water pipe, a nozzle, and a water pump; the disc-shaped water inlet is placed in a water storage tank, the disc-shaped water inlet is connected to the water pump through a water pipe, and the nozzle is connected to the water pump through another water pipe; the nozzle and the water pump are arranged on a straight rod; the nozzle is used to spray water on the concrete specimen.

[0013] Furthermore, the sensing device includes a positioning sensor, a temperature sensor and a humidity sensor; the positioning sensor is arranged at both ends of the specimen slot; the temperature sensor and the humidity sensor are arranged inside the shell; the positioning sensor, the temperature sensor and the humidity sensor are all externally connected to the data acquisition end; when the pulley slides on the track, it drives the straight rod and the wheel to move left and right, and when the wheel touches the positioning sensors at both ends of the specimen slot, the pulley moves in the opposite direction.

[0014] Furthermore, the sensing device also includes a specimen sensor, which is arranged inside the concrete specimen, and the lead wire of the specimen sensor is connected to the data acquisition terminal through a threadable steel plate.

[0015] Furthermore, the pulley is externally connected to a micro motor, which is fixed on the other side of the track, and a water pressure control valve is arranged between the water pump and the nozzle; the control end is connected to the micro motor, the oil cylinder, the ignition device, the water pressure control valve and the water pump; the control end drives the micro motor to act on the pulley; the control end controls the opening and closing states of the oil cylinder, the ignition device, the water pressure control valve and the water pump; the power device supplies power to the ignition device and the water pump.

[0016] Furthermore, a water-stop strip is provided at the connection between the data acquisition end and the shell to prevent water from flowing out of the shell.

[0017] Furthermore, a leaking hole is provided at the bottom of the water tank, and the leaking hole is used to drain the water in the water tank; the visual window is a glass door that can be pushed up and down, and is used to place and take out concrete specimens and observe the internal conditions of the shell.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The aircraft impact load test device, specimen placement device, water circulation device and sensor device configured in the utility model do not interfere with each other. The water entering the specimen tank enters the water storage tank through the perforated steel plate, solving the problems of water leakage and water recycling in the traditional environmental chamber. The utility model has a reasonable structure, simple operation and accurate data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the external structure of the airport pavement concrete stress-strain state acquisition device of the utility model;

[0022] Figure 2 It is a schematic diagram of the internal structure of the airport pavement concrete stress-strain state acquisition device of the utility model;

[0023] Figure 3 It is a structural schematic diagram of an aircraft impact load test device;

[0024] Figure 4 It is a schematic diagram of the three-speed limit lever;

[0025] Figure 5 Schematic diagram of the specimen tank.

[0026] Among them, 1-data acquisition terminal; 2-power device; 3-water storage tank; 4-waterproof rubber strip; 5-threaded steel plate; 6-three-speed limit rod; 7-first telescopic axis; 8-operating lever; 9-positioning sensor; 10-concrete specimen; 11-visible window; 12-perforated steel plate; 13-card slot; 14-longitudinal limit device; 15-movable steel plate; 16-fixed bracket; 17-oil cylinder; 18-sprinkler; 19-track; 20-wheel; 21-disc Water inlet; 22- tail flame nozzle; 23- temperature sensor; 24- humidity sensor; 25- shell; 26- water pipe; 27- specimen slot; 28- bracket; 29- pulley; 30- control end; 31- support; 32- water pump; 33- water leakage hole; 34- second telescopic shaft; 35- straight rod; 36- ignition device; 37- connecting rod; 38- cylinder; 39- fixed rod; 40- micro motor; 41- water pressure control valve; 42- movable slot. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] The utility model is further described in detail below with reference to the accompanying drawings:

[0034] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The utility model discloses a device for collecting stress and strain state of concrete pavement of an airport, comprising: a data collection terminal 1, a support 31, a water storage tank 3, a shell 25, an aircraft impact load test device, a specimen placement device, a water circulation device and a sensor device;

[0035] The water storage tank 3 is arranged on the support 31, and the water storage tank 3 is externally connected to a water circulation device; the specimen placement device is arranged on the water storage tank 3, the aircraft impact load test device is arranged above the space of the specimen placement device, the aircraft impact load test device is arranged inside the shell 25, the water circulation device is arranged on the aircraft impact load test device, and is used to cool the aircraft impact load test device and apply water pressure to the concrete specimen 10 in the specimen placement device, the sensor device is arranged inside the shell 25, the sensor device is externally connected to the data acquisition terminal 1, and a visual window 11 is arranged on the shell 25; the data acquisition terminal 1 is connected to the control terminal 30; the control terminal 30 is connected to the power device 2, and the power device 2 supplies power to the data acquisition terminal 1 and the control terminal 30; the control terminal 30 controls the opening and closing states of the aircraft impact load test device and the water circulation device; the control terminal 30 records the status information of the aircraft impact load test device, the water circulation device and the sensor device.

[0036] The specimen placement device includes: a specimen slot 27, a bracket 28, a joystick 8, a three-gear limit rod 6 and a longitudinal limit device 14;

[0037] One side of the specimen slot 27 is a movable steel plate 15; the other side of the specimen slot 27 is a threadable steel plate 5; the three-speed limit rod 6 is arranged at one end of the specimen slot 27, and the two ends of the three-speed limit rod 6 are respectively connected to the movable steel plate 15 and the threadable steel plate 5; the operating rod 8 is welded to the longitudinal limit device 14; the longitudinal limit device 14 is connected to the movable steel plate 15; the bracket 28 is arranged at the bottom of the specimen slot 27, and a perforated steel plate 12 is arranged between the bracket 28 and the water tank 3; the concrete specimen 10 is placed inside the specimen slot 27; the operating end of the operating rod 8 is arranged at the outer end of the shell 25, and a movable groove 42 is arranged on the shell 25, which is used for the operating end of the operating rod 8 to move freely at the outer end of the shell 25.

[0038] The third-gear limit rod 6 includes a first telescopic shaft 7, a second telescopic shaft 34 and a cylinder 38; the first telescopic shaft 7 can be retracted into the second telescopic shaft 34, and the second telescopic shaft 34 can be retracted into the cylinder 38. A slot 13 is provided between the cylinder 38 and the second telescopic shaft 34, and between the first telescopic shaft 7 and the second telescopic shaft 34. The slot 13 is used to install a limit pile to prevent the first telescopic shaft 7 and the second telescopic shaft 34 from retracting.

[0039] The aircraft impact load test device comprises: a track 19, a cylinder 17, a tail flame nozzle 22, a straight rod 35, a wheel 20, an ignition device 36, a fixed bracket 16 and a pulley assembly; both ends of the track 19 are fixed inside the housing 25, and the two tracks 19 are arranged opposite to each other; the pulley assembly comprises a pulley 29 and a connecting rod 37; pulleys 29 are arranged at both ends of the connecting rod 37; the pulley 29 is arranged in the groove of the track 19; a fixed rod 39 is arranged between the two connecting rods 37; the cylinder 17 is fixedly arranged on the fixed rod 39; one end of the cylinder 17 is connected to the end point of the straight rod 35; the straight rod 35 moves up and down driven by the inner shaft of the cylinder 17; the wheel 20 is fixedly connected to the straight rod 35; the tail flame nozzle 22 is arranged on the straight rod 35, the tail flame nozzle 22 is connected to the ignition device 36, and the ignition device 36 is arranged on the straight rod 35; one end of the fixed bracket 16 is connected to the wheel 20; the other end of the fixed bracket 16 is connected to the straight rod 35.

[0040] The water circulation device includes: a disc-shaped water inlet 21, a water pipe 26, a nozzle 18, and a water pump 32; the disc-shaped water inlet 21 is placed in the water storage tank 3, the disc-shaped water inlet 21 is connected to the water pump 32 through the water pipe 26, and the nozzle 18 is connected to the water pump 32 through another water pipe; the nozzle 18 and the water pump 32 are arranged on a straight rod 35; the nozzle 18 is used to spray water on the concrete specimen 10.

[0041] The sensing device includes a positioning sensor 9, a temperature sensor 23 and a humidity sensor 24; the positioning sensor 9 is arranged at both ends of the specimen slot 27; the temperature sensor 23 and the humidity sensor 24 are arranged inside the shell 25; the positioning sensor 9, the temperature sensor 23 and the humidity sensor 24 are all externally connected to the data acquisition terminal 1; when the pulley 29 slides on the track 19, it drives the straight rod 35 and the wheel 20 to move left and right, and when the wheel 20 touches the positioning sensors 9 at both ends of the specimen slot 27, the pulley 29 moves in the opposite direction.

[0042] The sensing device further comprises a specimen sensor, which is arranged on the concrete specimen 10 , and the lead wire of the specimen sensor is connected to the data acquisition terminal 1 through a threadable steel plate 5 .

[0043] The pulley 29 is externally connected to a micro motor 40, which is fixed on the other side of the track 19, and a water pressure control valve 41 is provided between the water pump 32 and the nozzle 18; the control end 30 is connected to the micro motor 40, the oil cylinder 17, the ignition device 36, the water pressure control valve 41 and the water pump 32; the control end 30 drives the micro motor 40 to act on the pulley 29; the control end 30 controls the opening and closing states of the oil cylinder 17, the ignition device 36, the water pressure control valve 41 and the water pump 32; the power device 2 supplies power to the ignition device 36 and the water pump 32.

[0044] A water-stopping rubber strip 4 is provided at the connection between the data acquisition terminal 1 and the housing 25 to prevent water from flowing out of the housing 25. A water leakage hole 33 is provided at the bottom of the water storage tank 3, and the water leakage hole 33 is used to drain the water of the water storage tank 3; the visual window 11 is a glass door that can be pushed up and down, and is used to place and take out the concrete specimen 10 and observe the internal situation of the housing 25. The three-gear limit rod 6 has a total length of 55 cm and an active length of 25 cm, which is divided into limited lengths of 55 cm, 40 cm and 30 cm, so that three sizes of concrete specimens 10 can be placed.

[0045] The working process of the utility model is:

[0046] The experimenter applies an external force to the operating end of the joystick 8, and the operating end of the joystick 8 moves freely at the outer end of the shell 25 under the action of the external force. At the same time, the joystick 8 drives the longitudinal limit device 14 and the movable steel plate 15 to move. When the width of the specimen slot 27 needs to be widened, the second telescopic shaft 34 on the third-gear limit rod 6 is extended from the cylinder 38, and when it encounters the slot 13 between the cylinder 38 and the second telescopic shaft 34, the limit pile is installed on the slot 13; if the movable steel plate 15 continues to move, the first telescopic shaft 7 is extended from the second telescopic shaft 34 until it encounters the slot 13 between the first telescopic shaft 7 and the second telescopic shaft 34, and the limit pile is installed on the slot 13 again, and finally the position of the movable steel plate 15 is limited. When the width of the specimen groove 27 needs to be narrowed, the limit pile of the slot 13 between the cylinder 38 and the second telescopic shaft 34 or the limit pile on the slot 13 between the first telescopic shaft 7 and the second telescopic shaft 34 is pulled out as needed to drive the third-gear limit rod 6 to retract; after determining the width of the specimen groove 27, the concrete specimen 10 is placed inside the specimen groove 27.

[0047] The temperature sensor 23 and the humidity sensor 24 upload the collected temperature and humidity information inside the shell 25 to the data acquisition terminal 1; the control terminal 30 sends instructions to the micro motor 40, the cylinder 17 and the ignition device 36 according to the information transmitted by the data acquisition terminal 1, and the micro motor 40 drives the pulley 29 to slide on the track 19, thereby driving the wheel 20 and the straight rod 35 to move left and right; under the instruction of the control terminal 30, the cylinder 17 drives the straight rod 35 and the wheel 20 to move up and down through the inner shaft, and the wheel 20 acts on the concrete specimen 10 to apply pressure to the concrete specimen 10; when the wheel 20 touches the positioning sensors 9 at both ends of the specimen groove 27, the positioning sensors 9 upload the touch information to the control terminal 30, and the control terminal 30 drives the micro motor 40 to drive the pulley 29 to move in the opposite direction, and then the wheel 20 moves in the opposite direction to the original direction. When the control terminal 30 issues a closing command, the micro motor 40 and the oil cylinder 17 stop working, and the wheel 20 and the pulley 29 also stop moving.

[0048] The ignition device 36 ignites under the command of the control end 30, and evenly burns the concrete specimen 10 through the tail flame nozzle 22. The specimen sensor uploads the temperature information of the concrete specimen 10 to the control end 30 through the data acquisition end 1. When the temperature of the concrete specimen 10 is greater than the temperature threshold set on the control end 30, the control end 30 turns off the ignition device 36 and sends instructions to the pump 32 and the water pressure control valve 41 at the same time; the water in the water storage tank 3 is sprayed on the concrete specimen 10 through the nozzle 18, and the generated water pressure information is uploaded to the control end 30 through the specimen sensor through the data acquisition end 1. When the water pressure borne by the concrete specimen 10 is greater than the water pressure threshold set on the control end 30, the control end 30 turns off the pump 32 and the water pressure control valve 41. The water sprayed on the concrete specimen 10 flows back into the water storage tank 3 through the perforated steel plate 12. The water in the water storage tank 3 can be replaced with a salt solution to obtain the corrosion information of the salt solution on the concrete specimen 10. The water leakage hole 33 on the water storage tank 3 is used to empty the water of the water storage tank 3. At the same time, the experimenter observes the test process through the visual window 11 throughout the whole process.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for collecting stress and strain state of airport pavement concrete, characterized in that: include: A data acquisition terminal (1), a support (31), a water storage tank (3), a housing (25), an aircraft impact load test device, a test piece placement device, a water circulation device and a sensor device; The water storage tank (3) is arranged on the support (31), and the water storage tank (3) is externally connected to a water circulation device; the specimen placement device is arranged on the water storage tank (3), the aircraft impact load test device is arranged above the space of the specimen placement device, and the aircraft impact load test device is arranged inside the housing (25); the water circulation device is arranged on the aircraft impact load test device and is used to cool the aircraft impact load test device and apply water pressure to the concrete specimen (10) in the specimen placement device; the sensor device is arranged on the housing (25) ) inside, the sensor device is externally connected to a data acquisition terminal (1), and a visual window (11) is provided on the shell (25); the data acquisition terminal (1) is connected to a control terminal (30); the control terminal (30) is connected to an electric device (2), and the electric device (2) supplies power to the data acquisition terminal (1) and the control terminal (30); the control terminal (30) controls the opening and closing states of the aircraft impact load test device and the water circulation device; the control terminal (30) records the status information of the aircraft impact load test device, the water circulation device and the sensor device.

2. The airport pavement concrete stress-strain state acquisition device according to claim 1 is characterized in that: The specimen placement device comprises: a specimen slot (27), a bracket (28), a control lever (8), a three-speed limiting lever (6) and a longitudinal limiting device (14); One side of the specimen slot (27) is a movable steel plate (15); the other side of the specimen slot (27) is a threadable steel plate (5); the three-gear limit rod (6) is arranged at one end of the specimen slot (27), and the two ends of the three-gear limit rod (6) are respectively connected to the movable steel plate (15) and the threadable steel plate (5); the operating rod (8) is welded to the longitudinal limit device (14); the longitudinal limit device (14) is connected to the movable steel plate (15); the bracket (28) is arranged at the bottom of the specimen slot (27), and a perforated steel plate (12) is arranged between the bracket (28) and the water storage tank (3); the concrete specimen (10) is placed inside the specimen slot (27); the operating end of the operating rod (8) is arranged at the outer end of the shell (25), and a movable groove (42) is arranged on the shell (25) for the operating end of the operating rod (8) to move freely at the outer end of the shell (25).

3. The airport pavement concrete stress-strain state acquisition device according to claim 2, characterized in that: The three-speed limit rod (6) comprises a first telescopic shaft (7), a second telescopic shaft (34) and a cylinder (38); the first telescopic shaft (7) can be retracted into the second telescopic shaft (34), and the second telescopic shaft (34) can be retracted into the cylinder (38); a clamping groove (13) is provided between the cylinder (38) and the second telescopic shaft (34), and between the first telescopic shaft (7) and the second telescopic shaft (34); the clamping groove (13) is used to install a limit pile to prevent the first telescopic shaft (7) and the second telescopic shaft (34) from retracting.

4. The airport pavement concrete stress-strain state acquisition device according to claim 3 is characterized in that: The aircraft impact load test device comprises: a track (19), a cylinder (17), a tail flame nozzle (22), a straight rod (35), a wheel (20), an ignition device (36), a fixed bracket (16) and a pulley assembly; The two ends of the track (19) are fixed inside the housing (25), and the two tracks (19) are arranged opposite to each other; the pulley assembly comprises a pulley (29) and a connecting rod (37); pulleys (29) are arranged at both ends of the connecting rod (37); the pulley (29) is arranged in a groove of the track (19); a fixing rod (39) is arranged between the two connecting rods (37); the oil cylinder (17) is fixedly arranged on the fixing rod (39); one end of the oil cylinder (17) is connected to the fixing rod (39); The end point of the straight rod (35); the straight rod (35) moves up and down under the drive of the inner shaft of the oil cylinder (17); the wheel (20) is fixedly connected to the straight rod (35); the tail flame nozzle (22) is arranged on the straight rod (35), the tail flame nozzle (22) is connected to the ignition device (36), and the ignition device (36) is arranged on the straight rod (35); one end of the fixed bracket (16) is connected to the wheel (20); and the other end of the fixed bracket (16) is connected to the straight rod (35).

5. The airport pavement concrete stress-strain state acquisition device according to claim 4, characterized in that: The water circulation device comprises: a disc-shaped water inlet (21), a water pipe (26), a nozzle (18), and a water pump (32); the disc-shaped water inlet (21) is placed in a water storage tank (3); the disc-shaped water inlet (21) is connected to the water pump (32) via a water pipe (26); the nozzle (18) is connected to the water pump (32) via another water pipe; the nozzle (18) and the water pump (32) are arranged on a straight rod (35); the nozzle (18) is used to spray water onto a concrete specimen (10).

6. The airport pavement concrete stress-strain state acquisition device according to claim 5, characterized in that: The sensing device comprises a positioning sensor (9), a temperature sensor (23) and a humidity sensor (24); the positioning sensor (9) is arranged at both ends of the specimen slot (27); the temperature sensor (23) and the humidity sensor (24) are arranged inside a housing (25); the positioning sensor (9), the temperature sensor (23) and the humidity sensor (24) are all externally connected to a data acquisition terminal (1); when the pulley (29) slides on the track (19), it drives the straight rod (35) and the wheel (20) to move left and right, and when the wheel (20) touches the positioning sensors (9) at both ends of the specimen slot (27), the pulley (29) moves in opposite directions.

7. The airport pavement concrete stress-strain state acquisition device according to claim 6, characterized in that: The sensing device also includes a specimen sensor, which is arranged inside the concrete specimen (10), and the lead wire of the specimen sensor is connected to the data acquisition terminal (1) through a threadable steel plate (5).

8. The airport pavement concrete stress-strain state acquisition device according to claim 7, characterized in that: The pulley (29) is externally connected to a micro motor (40), and the micro motor (40) is fixed on the other side of the track (19). A water pressure control valve (41) is provided between the water pump (32) and the nozzle (18); the control end (30) is connected to the micro motor (40), the oil cylinder (17), the ignition device (36), the water pressure control valve (41) and the water pump (32); the control end (30) drives the micro motor (40) to act on the pulley (29); the control end (30) controls the opening and closing states of the oil cylinder (17), the ignition device (36), the water pressure control valve (41) and the water pump (32); and the power device (2) supplies power to the ignition device (36) and the water pump (32).

9. The airport pavement concrete stress-strain state acquisition device according to claim 8, characterized in that: A water-stopping rubber strip (4) is provided at the connection between the data acquisition end (1) and the housing (25) to prevent water from flowing out of the housing (25).

10. The airport pavement concrete stress-strain state acquisition device according to claim 9, characterized in that: The bottom of the water storage tank (3) is provided with a leaking hole (33) for draining the water in the water storage tank (3); the visual window (11) is a glass door that can be pushed up and down and is used for placing and removing the concrete test piece (10) and observing the internal conditions of the housing (25).

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