An experimental device and method for highway subgrade based on waste tire rubber particles

Abstract

The invention provides a highway roadbed test device and method based on waste tire rubber particles, which are used to solve the problem that in the prior art, it is impossible to perform multi-scenario coupling experiments on roadbed specimens containing waste tire rubber particles. A force-applying mechanism is used to close the opening of an experimental cavity to form a closed experimental environment in a test box, and a support is used to support the specimen in the experimental cavity. Then, a first environment simulation mechanism and a second environment simulation mechanism are used to simulate the environment of the specimen in different use scenarios, and when the specimen is subjected to a compressive strength test, a lifting mechanism is used to drive the test box to move so that the test box avoids the force-applying mechanism, so that the force-applying mechanism can apply a vertical downward force to the specimen. That is, through the above-mentioned arrangement, the test device can simulate a variety of use scenarios, so that the test device can accurately test the experimental data of the specimen when it is used specifically, which has a significant significance for the promotion and application of waste tire rubber particles in highway roadbeds.

Description

Technical Field

[0001] The present invention belongs to the field of highway subgrade experiments based on waste tire rubber particles, and particularly relates to an experimental device and method for highway subgrade based on waste tire rubber particles. Background Art

[0002] Waste tire rubber particles have been tried in asphalt mixtures (such as rubber asphalt) or cement concrete, but mainly used in the pavement layer, and there is less application research in the subgrade or base layer. In addition, after adding waste tire rubber particles to base materials (such as crushed stones, cement, etc.), the following problems often exist: First, the interfacial bonding is weak. The rubber surface is hydrophobic and has poor adhesion to cement paste, which is easy to become the origin point of cracks; Second, the strength loss is large. The rubber has a low elastic modulus, and excessive addition will cause a significant decrease in the compressive strength of the base layer; Third, the water stability is insufficient. The rubber-cement interface is vulnerable to water erosion, and the performance decays rapidly after long-term soaking or freeze-thaw cycles.

[0003] In order to explore the optimal ratio of waste tire rubber particles incorporated into the highway subgrade, usually multiple specimens incorporated with different components of waste tire rubber particles are prepared, and then the specimens are tested using experimental equipment such as temperature shrinkage test devices, freeze-thaw test devices, and three-point bending test devices. However, this experimental method can only test the specimens in a single scenario each time, and it is impossible to obtain experimental data under multi-scenario coupling, resulting in a large gap between the experimental data and the actual data in specific application scenarios, thus limiting the application of waste tire rubber particles in the highway subgrade. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an experimental device and method for highway subgrade based on waste tire rubber particles, which is used to solve the problem that multi-scenario coupling experiments cannot be carried out on subgrade specimens incorporated with waste tire rubber particles in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a highway subgrade experimental device based on waste tire rubber particles, comprising: a base, an experimental box, two support members spaced apart on the base, a first environmental simulation mechanism provided on the experimental box, a second environmental simulation mechanism provided on the base, a force application mechanism, and a lifting mechanism; an experimental cavity is provided in the experimental box, the experimental cavity has an opening, and the opening is located at the top of the experimental box; at least part of the two support members is provided in the experimental cavity for supporting the test piece; the first environmental simulation mechanism is used to change the air temperature and / or the water temperature in the experimental cavity; the second environmental simulation mechanism is connected to the experimental cavity through a pipeline for adding water to the experimental cavity to change the air humidity in the experimental cavity and / or soaking the test piece; the force application mechanism is used to apply a vertically downward force to the test piece to test the compressive strength of the test piece and to seal the opening of the experimental cavity; the lifting mechanism is connected to the bottom of the experimental box for driving the experimental box to move up and down, so as to facilitate the force application mechanism to apply a vertically downward force to the test piece and to facilitate the force application mechanism to seal the opening of the experimental cavity.

[0006] Optionally, each support member includes two support feet, two U-shaped bending sections, and a support section; there are 4 first avoidance openings provided on the experimental box for avoiding the U-shaped bending sections, and the 4 first avoidance openings and the 4 U-shaped bending sections are arranged in one-to-one correspondence; part of the U-shaped bending section and the support section are located in the experimental cavity; the support feet and the U-shaped bending sections are arranged in one-to-one correspondence, one end of the U-shaped bending section is connected to the support foot, and the other end is connected to the support section; the end of the support foot away from the U-shaped bending section is connected to the base.

[0007] Optionally, the lifting mechanism includes a fixed seat, a first mounting seat, a guiding seat, a second mounting seat, a first telescopic driving member, and two triangular rotating seats; the experimental box is arranged on the top of the fixed seat; the first mounting seat, the guiding seat, and the second mounting seat are spaced apart on the base; and the first mounting seat and the guiding seat are arranged corresponding to the left side of the fixed seat, and the second mounting seat is arranged corresponding to the right side of the fixed seat; the left side wall of the fixed seat is slidably connected to the guiding seat, and waist-shaped holes are respectively provided on the right sides of the front side wall and the rear side wall of the fixed seat; the first corners of the two triangular rotating seats are respectively rotatably connected to the second mounting seat, the second corners are respectively rotatably connected to the output ends of the first telescopic driving member, the third corner of one of the triangular rotating seats is slidably connected to the waist-shaped hole on the front side wall of the fixed seat, and the third corner of the other triangular rotating seat is slidably connected to the waist-shaped hole on the rear side wall of the fixed seat; the fixed end of the first telescopic driving member is rotatably connected to the first mounting seat, and at any moment, the central axis of the first telescopic driving member is not parallel to the horizontal plane.

[0008] Optionally, the lifting mechanism further includes a rotating shaft and a rolling member. The rolling member is disposed at one end of the rotating shaft. One end of the rotating shaft is connected to the third angle of the triangular rotating seat, and the other end is connected to the kidney-shaped hole through the rolling member. When the lifting mechanism drives the experimental box to move upward to the limit position, the connection line between the first angle and the third angle of the triangular rotating seat is parallel to the perpendicular bisector of the base. When the lifting mechanism drives the experimental box to move downward to the limit position, the connection line between the first angle and the second angle of the triangular rotating seat is parallel to the perpendicular bisector of the base.

[0009] Optionally, the force application mechanism includes a support base, a second telescopic driving member, a pressing plate, a cover plate, and two third telescopic driving members. The support base is disposed on the base, and the second telescopic driving member is disposed on the support base. The pressing plate is disposed at the movable end of the second telescopic driving member and is used to abut against the test piece. The middle of the cover plate is rotatably connected to the movable end of the second telescopic driving member, and the cover plate is used to seal the opening of the experimental cavity. The fixed ends of the two third telescopic driving members are rotatably connected to the movable end of the second telescopic driving member. The movable end of one third telescopic driving member is rotatably connected to the left top of the cover plate, and the movable end of the other third telescopic driving member is rotatably connected to the right top of the cover plate. The two third telescopic driving members are used to fold the cover plate. The connection points of the fixed ends of the third telescopic driving members, the cover plate, and the pressing plate with the movable end of the second telescopic driving member are sequentially spaced on the movable end of the second telescopic driving member, and the connection point of the pressing plate with the movable end of the second telescopic driving member is located on the side close to the experimental box.

[0010] Optionally, the first environmental simulation mechanism includes a heating assembly for heating the air and / or water in the experimental cavity, and a refrigeration assembly for cooling the air and / or water in the experimental cavity. The second environmental simulation mechanism includes a water storage tank, a first water pump, and a first solenoid valve. The first water pump is connected to the water storage tank and the experimental cavity through a pipeline to transfer the water in the water storage tank to the experimental cavity. The first solenoid valve is connected to the water storage tank and a first water outlet disposed at the bottom of the experimental cavity through a pipeline to transfer the water in the experimental cavity to the water storage tank. The refrigeration assembly includes a heat dissipation cavity, a second water pump, a second solenoid valve, and a first semiconductor refrigeration chip. The heat dissipation cavity is disposed on the outer side wall of the experimental box. The refrigerating end of the first semiconductor refrigeration chip is disposed in the experimental cavity, and the heating end is disposed in the heat dissipation cavity. The second water pump is connected to the heat dissipation cavity and the water storage tank through a pipeline to transfer the water in the water storage tank to the heat dissipation cavity. The second solenoid valve is connected to a second water outlet disposed at the bottom of the heat dissipation cavity and the water storage tank through a pipeline to transfer the water in the heat dissipation cavity to the water storage tank. A detection member is further disposed in the experimental box, and the detection member is used to detect the temperature and / or humidity in the experimental cavity.

[0011] Optionally, the heating component includes a heat dissipation cavity, a third water pump, a third solenoid valve, and a second semiconductor refrigeration chip; the heat dissipation cavity is arranged on the outer side wall of the experimental box, the refrigerating end of the second semiconductor refrigeration chip is arranged in the heat dissipation cavity, and the heating end is arranged in the experimental cavity; the third water pump is communicated with the heat dissipation cavity and the water storage tank through a pipeline to transfer the water in the water storage tank to the heat dissipation cavity; the third solenoid valve is communicated with the third water outlet arranged at the bottom of the heat dissipation cavity and the water storage tank through a pipeline to transfer the water in the heat dissipation cavity to the water storage tank.

[0012] Optionally, the second environment simulation mechanism further includes a fourth water pump and a fourth solenoid valve; the water storage tank includes a hot water storage cavity and a cold water storage cavity, the first water pump is connected with the hot water storage cavity and the experimental cavity through a pipeline, and the first solenoid valve is connected with the hot water storage cavity and the first water outlet arranged at the bottom of the experimental cavity through a pipeline; the fourth water pump is connected with the cold water storage cavity and the experimental cavity through a pipeline; the fourth solenoid valve is connected with the cold water storage cavity and the fourth water outlet arranged at the bottom of the experimental cavity through a pipeline; the second water pump is connected with the heat dissipation cavity and the hot water storage cavity through a pipeline; the second solenoid valve is connected with the second water outlet at the bottom of the heat dissipation cavity and the hot water storage cavity through a pipeline; the third water pump is connected with the heat dissipation cavity and the cold water storage cavity through a pipeline; the third solenoid valve is connected with the third water outlet at the bottom of the heat dissipation cavity and the cold water storage cavity through a pipeline.

[0013] Optionally, the second environment simulation mechanism further includes a plurality of third semiconductor refrigeration chips, the cold water storage cavity and the hot water storage cavity are of a square structure, and the cold water storage cavity is located in the hot water storage cavity; at least one third semiconductor refrigeration chip is arranged on the side wall of each cold water storage cavity, the refrigerating end of the third semiconductor refrigeration chip is located in the cold water storage cavity, and the heating end is located in the hot water storage cavity.

[0014] On the other hand, the present invention also provides a method for testing a highway subgrade based on waste tire rubber particles, including a testing device for a highway subgrade based on waste tire rubber particles as described above; the method further includes the following steps: a specimen placement step: placing the prepared specimen into the experimental cavity and closing the opening of the experimental cavity by using a force application mechanism; an environment simulation step: simulating the environment through the first environment simulation mechanism and the second environment simulation mechanism; a compressive strength testing step: driving the experimental box to move downward by the lifting mechanism, and then applying a downward acting force on the specimen by using the force application mechanism to complete the compressive strength test.

[0015] As described above, a highway roadbed test device and method based on waste tire rubber particles of the present invention have at least the following beneficial effects: a test chamber with an upper opening is provided in the test box, and the opening of the test chamber is closed by a force-applying mechanism to form a closed test environment in the test box, and the test piece is supported in the test chamber by a support member; then the air temperature in the test chamber can be changed by a first environment simulation mechanism to perform shrinkage, temperature shrinkage and other experiments on the test piece; the first environment simulation mechanism and the second environment simulation mechanism are used to soak the test piece in water of different temperatures and freeze-thaw; when the test piece is subjected to a compressive strength test, the lifting mechanism is used to drive the test box to move so that the test box avoids the force-applying mechanism, so that the force-applying mechanism can apply a vertical downward force to the test piece; that is, through the arrangement of the force-applying mechanism, the test box, the lifting mechanism, the support member, the first environment simulation mechanism and the second environment simulation mechanism, the test device can simulate a variety of usage scenarios, so that the test device can accurately test the experimental data of the test piece when it is used specifically, which has significant significance for the promotion and application of waste tire rubber particles in highway roadbeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic structural diagram of an angle of a highway roadbed experimental device based on waste tire rubber particles of the present invention.

[0017] Figure 2 It is a schematic diagram showing an angle in which part of the structure of a highway subgrade experimental device based on waste tire rubber particles of the present invention is omitted.

[0018] Figure 3 Another perspective schematic diagram showing a highway roadbed experimental device based on waste tire rubber particles according to the present invention with some structures omitted.

[0019] Figure 4 Displayed as Figure 3 Schematic diagram of the state of the first mounting seat, the second mounting seat, the first telescopic driving member and the triangular rotating seat in the state of the lifting mechanism.

[0020] Figure 5 A schematic diagram showing another angle in which part of the structure of a highway subgrade experimental device based on waste tire rubber particles of the present invention is omitted.

[0021] Figure 6 Displayed as Figure 5 Schematic diagram of the state of the first mounting seat, the second mounting seat, the first telescopic driving member and the triangular rotating seat in the state of the lifting mechanism.

[0022] Figure 7 Shown is a schematic diagram of the internal structure of a water storage tank. DETAILED DESCRIPTION

[0023] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0024] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope for the implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope for the implementation of the present invention.

[0025] The following various embodiments are only for illustration. Combinations can be made between the various embodiments, which are not limited to the content shown in the following single embodiment.

[0026] Please refer to Figure 1 The present invention provides a highway subgrade experimental device based on waste tire rubber particles, including: a base 1, an experimental box 2, two support members 3 spaced apart on the base 1, a first environmental simulation mechanism 4 provided on the experimental box 2, a second environmental simulation mechanism 5, a force application mechanism 6, and a lifting mechanism 7 provided on the base 1; an experimental cavity 21 is provided in the experimental box 2, the experimental cavity 21 has an opening, and the opening is located at the top of the experimental box 2; at least part of the two support members 3 is arranged in the experimental cavity 21 for supporting the test piece; the first environmental simulation mechanism 4 is used to change the air temperature and / or the water temperature in the experimental cavity 21; the second environmental simulation mechanism 5 is connected to the experimental cavity 21 through a pipeline for adding water into the experimental cavity 21 to change the air humidity in the experimental cavity 21 and / or soak the test piece; the force application mechanism 6 is used to apply a vertically downward force to the test piece to test the compressive strength of the test piece and to seal the opening of the experimental cavity 21; the lifting mechanism 7 is connected to the bottom of the experimental box 2 for driving the experimental box 2 to move up and down, so as to facilitate the force application mechanism 6 to apply a vertically downward force to the test piece and to facilitate the force application mechanism 6 to seal the opening of the experimental cavity 21.

[0027] Please refer to Figure 1-3, 5. The support member 3 may include two support feet 31, two U-shaped bending segments 32, and a strip-shaped support segment 33. The support feet 31 and the U-shaped bending segments 32 are arranged in one-to-one correspondence. One end of the U-shaped bending segment 32 is connected to the support foot 31, and the other end is connected to the support segment 33. The end of the support foot 31 away from the U-shaped bending segment 32 is connected to the base 1. Four first avoidance openings 23 for avoiding the U-shaped bending segments 32 are provided on the experimental box 2, and the four first avoidance openings 23 and the four U-shaped bending segments 32 are arranged in one-to-one correspondence. In this embodiment, when the lifting assembly drives the experimental box 2 to move upward to the extreme position, the upper top surface of the U-shaped bending segment 32 is flush with the upper top surface of the experimental box 2, so as to facilitate the subsequent force application mechanism 6 to seal the opening of the experimental box 2. In order to ensure the sealing performance between the U-shaped bending segment 32 and the first avoidance opening 23, an elastic seal may be provided at the first avoidance opening 23, such as a seal made of rubber or other materials. In this way, when the U-shaped bending segment 32 is docked with the first avoidance opening 23, the elastic seal can fill the gap between the two to prevent hot air, cold air, etc. in the experimental box 2 from leaking. In addition, the length of the end of the first avoidance opening 23 close to the bottom of the experimental cavity 21 from the bottom of the experimental cavity 21 is greater than the height of the top surface of the test piece from the bottom of the experimental cavity 21 after the test piece is placed on the support segment 33, thereby further ensuring that water will not leak through the first avoidance opening 23 during the freeze-thaw test or the immersion test.

[0028] In this embodiment, through the setting of the support member 3, the test piece can be located inside the experimental box 2, so as to facilitate the experiment on the test piece. In addition, the setting of the support member 3 and the first avoidance opening 23 can also ensure the sealing performance of the experimental box 2, and when the lifting mechanism 7 drives the experimental box 2 to move up and down, the position of the test piece will not change, thus ensuring the normal progress of the experiment.

[0029] Please refer to Figure 3-6, the lifting mechanism 7 includes a fixed seat 71, a first mounting seat 72, a guide seat 73, a second mounting seat 74, a first telescopic driving member 75 and two triangular rotating seats 76; the experimental box 2 is arranged on the top of the fixed seat 71; the first mounting seat 72, the guide seat 73 and the second mounting seat 74 are arranged on the base 1 at intervals; and the first mounting seat 72 and the guide seat are arranged corresponding to the left side of the fixed seat 71, and the second mounting seat 74 is arranged corresponding to the right side of the fixed seat 71; the left side wall of the fixed seat 71 is slidably connected with the guide seat 73, and waist-shaped holes are respectively arranged on the right sides of the front side wall and the rear side wall of the fixed seat 71; the first angles 761 of the two triangular rotating seats 76 are respectively rotatably connected with the second mounting seat 74, the second angles 762 are respectively rotatably connected with the output ends of the first telescopic driving member 75, and the third angle 763 of one of the triangular rotating seats 76 is slidably connected with the waist-shaped hole on the front side wall of the fixed seat 71, and the third angle 763 of the other triangular rotating seat 76 is slidably connected with the waist-shaped hole on the rear side wall of the fixed seat 71; the fixed end of the first telescopic driving member 75 is rotatably connected with the first mounting seat 72, and at any moment, the central axis of the first telescopic driving member 75 is arranged non-parallel to the horizontal plane.

[0030] Two guide seats 73 can be arranged. The two guide seats 73 are arranged on the base 1 at intervals, and the first mounting seat 72 is located between the two guide seats 73 to ensure the smooth movement of the experimental box 2. Guide rails can be arranged on the side wall of the guide seat 73 close to the experimental box 2, and the extending direction of the guide rails is parallel to the perpendicular bisector of the base 1. Sliders are arranged on the left side wall of the experimental box 2, that is, the sliding connection between the guide seat 73 and the experimental box 2 is realized through the slider and guide rail structure to ensure that the experimental box 2 can only move in the vertical direction. Two support side plates are arranged on the second mounting seat 74 at intervals, and the support side plates and the triangular rotating seats 76 are arranged in one-to-one correspondence. The first angle 761 of the triangular rotating seat 76 is rotatably connected with the support side plate through a rotating shaft, and the second angle 762 is also rotatably connected with the first telescopic driving member 75 through a rotating shaft. A rotating shaft 77 is arranged on the third angle 763, and a rolling member 78 is arranged on the rotating shaft 77. The rolling member 78 can be a structure such as a bearing. The rolling member 78 is connected with the waist-shaped hole. The arrangement of the rolling member 78 can reduce the friction between the triangular rotating seat 76 and the hole wall of the waist-shaped hole. The first telescopic driving member 75 can be a driving element such as an electric cylinder or a cylinder, and this embodiment does not limit this, as long as it can drive the triangular rotating seat 76 to rotate.

[0031] The working principle of the lifting mechanism 7: As Figure 3-4As shown in the figure, at this time, the lifting mechanism 7 is at the extreme upward position. At this time, the connection line b between the first angle 761 and the third angle 763 of the triangular rotating seat 76 is parallel to the perpendicular bisector a of the base 1. At this time, the lifting mechanism 7 forms a self-locking state. When the triangular rotating seat 76 is only subjected to a downward force, that is, when the experimental cavity 21 is filled with water and specimens, the experimental box 2 remains in a stable state. And at this time, the rolling member 78 is located at the rightmost side of the kidney-shaped hole, and the first telescopic driving member 75 is in an extended state.

[0032] As Figure 5-6 shown in the figure, when the first telescopic driving member 75 changes from the extended state to the contracted state, that is, when the first telescopic driving member 75 drives the triangular rotating seat 76 to rotate counterclockwise, the rolling member 78 slides from the rightmost side to the leftmost side of the kidney-shaped hole until the connection line c between the first angle 761 and the second angle 762 of the triangular rotating seat 76 is parallel to the perpendicular bisector a of the base 1. At this time, the lifting mechanism 7 still forms a self-locking state. When the triangular rotating seat 76 is only subjected to a downward force, that is, when the force applying mechanism 6 applies a downward force to the specimen, the triangular rotating seat 76 will not rotate, that is, the experimental box 2 remains in a stable state. And at this time, the rolling member 78 is located at the leftmost side of the kidney-shaped hole, and the first telescopic driving member 75 is in a contracted state.

[0033] In this embodiment, through the setting of the kidney-shaped hole and the triangular rotating seat 76, the movement stroke of the rolling member 78 is mechanically limited by the kidney-shaped hole, so that the first telescopic driving member 75 is mechanically limited between the extended state and the contracted state, ensuring that the experimental box 2 can be in a self-locking state at both the extreme upward position and the extreme downward position during movement, so as to maintain the stability of the experimental box 2.

[0034] Please refer to Figure 1 , the force applying mechanism 6 includes a support seat 61, a second telescopic driving member 62, a pressing plate 63, a cover plate and two third telescopic driving members 65; the support seat 61 is arranged on the base 1, and the second telescopic driving member 62 is arranged on the support seat 61; the pressing plate 63 is arranged on the movable end of the second telescopic driving member 62, and the pressing plate 63 is used to abut against the specimen. The middle part of the cover plate is rotatably connected to the movable end of the second telescopic driving member 62, and the cover plate is used to seal the opening of the experimental cavity 21; the fixed ends of the two third telescopic driving members 65 are rotatably connected to the movable end of the second telescopic driving member 62. The movable end of one third telescopic driving member 65 is rotatably connected to the left top of the cover plate, and the movable end of the other third telescopic driving member 65 is rotatably connected to the right top of the cover plate. The two third telescopic driving members 65 are used to fold the cover plate; the fixed ends of the third telescopic driving members 65, the cover plate and the connection points of the pressing plate 63 with the movable end of the second telescopic driving member 62 are sequentially arranged at intervals on the movable end of the second telescopic driving member 62, and the connection point of the pressing plate 63 with the movable end of the second telescopic driving member 62 is located on the side close to the experimental box 2.

[0035] The support base 61 can be an L-shaped support base. The second telescopic driving member 62 is arranged inside the short side of the L-shaped support base. One end of the pressing plate 63 facing the experimental box 2 can be a triangular structure, so as to converge the acting force of the second telescopic driving member 62 onto the specimen.

[0036] The cover plate can include a first sub-cover plate 641, a second sub-cover plate 642 and a flexible connecting plate 643. The hardness of the first sub-cover plate 641 and the second sub-cover plate 642 is greater than that of the flexible plate. The flexible plate is used to connect the first sub-cover plate 641 and the second sub-cover plate 642. A second avoidance opening for the movable end of the second telescopic driving member 62 to pass through and a first rotating shaft hole for the rotating shaft to pass through are arranged in the middle of the flexible plate. A second rotating shaft hole for the rotating shaft to pass through is arranged on the movable end of the second telescopic driving member 62. During installation, first pass the cover plate through the movable end of the second telescopic driving member 62 by using the second avoidance opening, and then align the first rotating shaft hole and the second rotating shaft hole, so as to fix the cover plate on the movable end of the second telescopic driving member 62 through the rotating shaft. The flexible plate can be made of materials with certain flexibility such as rubber, and the shape of the second avoidance opening is adapted to the shape of the movable end of the second telescopic driving member 62. In this way, the second avoidance opening of the flexible plate can fit onto the second telescopic driving member 62 to achieve the sealing function and facilitate the third driving member to fold it. The so-called adaptation here means that the shape of the second avoidance opening matches the shape of the second telescopic driving member 62. For example, when the outer shape of the movable end of the second telescopic driving member 62 is a cylinder with a diameter of 5 mm, the second avoidance opening is also a cylinder with a diameter of 5 mm or slightly smaller than 5 mm, so that the second avoidance opening can allow the movable end of the second telescopic driving member 62 to pass through and the side wall of the second avoidance opening can be tightly attached to the outer side wall of the movable end of the second telescopic driving member 62.

[0037] The force application mechanism 6 can also include a third mounting seat. The third mounting seat can be fixed on the movable end of the second telescopic driving member 62 through structures such as positioning pins. The fixed ends of the two third driving members are rotatably connected to the third mounting seat. One of the third telescopic driving members 65 is rotatably connected to the upper top surface of the first sub-cover plate 641, and the other third telescopic driving member 65 is rotatably connected to the upper top surface of the second sub-cover plate 642. The two third telescopic driving members 65 are used to drive the first sub-cover plate 641 and the second sub-cover plate 642 to rotate relative to the rotating shaft, that is, to make the flexible plate elastically deformed so that the cover plate is folded. The second telescopic driving member 62 and the third telescopic driving member 65 can be driving elements such as electric cylinders and air cylinders. This embodiment does not limit this.

[0038] When conducting experiments such as dry shrinkage and thermal shrinkage on the test piece, the two third telescopic driving members 65 keep the cover plate in a non-folded state, and then the second telescopic driving member 62 drives the cover plate, the third telescopic driving member 65 and the pressing plate 63 to move downward as a whole, so that the cover plate can seal the opening of the experimental cavity 21. At this time, since the cover plate first abuts against the top of the experimental box 2, the pressing plate 63 is not in contact with the test piece.

[0039] When it is necessary to conduct a compressive strength experiment on the test piece, the two third telescopic driving members 65 keep the cover plate in a folded state, and then the lifting mechanism 7 drives the experimental box 2 to move downward. Then, the second telescopic driving member 62 drives the pressing plate 63, the cover plate and the third telescopic driving member 65 to move downward as a whole. At this time, since the cover plate is folded, the cover plate will not contact the two support members 3, so that the pressing plate 63 can smoothly contact the test piece to complete the compressive strength experiment. In addition, after the cover plate is folded, it can also prevent the two ends of the test piece from contacting the cover plate after the test piece is bent, so as to ensure the accuracy of the compressive strength experiment data.

[0040] Please refer to Figure 1-3 Figs. 4 and 5, the first environmental simulation mechanism 4 includes a heating component 41 for heating the air and / or water in the experimental cavity 21, and a refrigeration component 42 for refrigerating the air and / or in the experimental cavity 21; the second environmental simulation mechanism 5 includes a water storage tank 51, a first water pump 52 and a first electromagnetic valve; the first water pump 52 is connected to the water storage tank 51 and the experimental cavity 21 through a pipeline to transfer the water in the water storage tank 51 to the experimental cavity 21, and the first electromagnetic valve is connected to the water storage tank 51 and a first water outlet arranged at the bottom of the experimental cavity 21 through a pipeline to transfer the water in the experimental cavity 21 to the water storage tank 51; the refrigeration component 42 includes a heat dissipation cavity 421, a second water pump 422, a second electromagnetic valve and a first semiconductor refrigeration chip 423; the heat dissipation cavity 421 is arranged on the outer side wall of the experimental box 2, the refrigeration end of the first semiconductor refrigeration chip 423 is arranged in the experimental cavity 21, and the heating end is arranged in the heat dissipation cavity 421; the second water pump 422 is connected to the heat dissipation cavity 421 and the water storage tank 51 through a pipeline to transfer the water in the water storage tank 51 to the heat dissipation cavity 421; the second electromagnetic valve is connected to a second water outlet arranged at the bottom of the heat dissipation cavity 421 and the water storage tank 51 through a pipeline to transfer the water in the heat dissipation cavity 421 to the water storage tank 51; a detection member 22 is further arranged in the experimental box 2, and the detection member 22 is used for detecting the temperature and / or humidity in the experimental cavity 21.

[0041] Specifically, the experimental cavity 21 may include a first water inlet arranged on the side wall of the experimental box 2 and a first water outlet arranged at the bottom of the experimental cavity 21; the first water pump 52 may be arranged on the top of the water storage tank 51 or the base 1, and the first water pump 52 may be connected to the first water inlet and the water storage tank 51 through a pipeline; the first electromagnetic valve is connected to the first water outlet and the water storage tank 51 through a pipeline.

[0042] The heat dissipation chamber 421 may include a second water inlet provided at the top of the heat dissipation chamber 421 and a second water outlet provided at the bottom of the heat dissipation chamber 421. The first water pump 52 is connected to the water storage tank 51 and the second water inlet through a pipeline; the second solenoid valve is connected to the water storage tank 51 and the second water inlet through a pipeline.

[0043] There may be two detection components 22, which are respectively a temperature sensor and a humidity sensor. Of course, it may also be other detection components for detecting temperature and humidity, and this embodiment does not limit this.

[0044] When conducting dry shrinkage or temperature shrinkage tests on the test piece, the air in the experimental chamber 21 is heated by the heating assembly 41 or cooled by the refrigeration assembly 42. The detection component 22 is used to detect in real time whether the temperature in the experimental chamber 21 reaches the preset temperature. When the preset temperature is reached, the heating or cooling of the air in the experimental chamber 21 can be stopped. During heating or cooling, the humidity sensor can be used to detect the air humidity in the experimental chamber 21. When the air humidity is too low, water can be transported into the experimental chamber 21 through the first water pump 52 to increase the air humidity in the experimental chamber 21.

[0045] When conducting a water stability test on the test piece, water can be added into the experimental chamber 21 through the first water pump 52 to complete the immersion of the test piece. After the immersion is completed, the first solenoid valve is opened to drain the water in the experimental chamber 21 into the water storage tank 51. Then, the lifting mechanism 7 drives the experimental box 2 to move downward, and the compressive strength test of the test piece is completed through the force application mechanism 6.

[0046] When conducting a freeze-thaw test on the test piece, water can be added into the experimental chamber 21 through the first water pump 52, and then the refrigeration assembly 42 is started to cool the water in the experimental chamber 21 to complete the freezing step of the test piece. While refrigerating, the second water pump 422 works to add water into the heat dissipation chamber 421, and the second solenoid valve is used to circulate the heat dissipation water into the water storage tank 51 to complete the preliminary heating step of the water in the water storage tank 51. When conducting the melting step of the test piece, by simultaneously opening the first solenoid valve and the first water pump 52, the water in the experimental chamber 21 is replaced, that is, replaced with the water preliminarily heated in the water storage tank 51. At this time, the water in the experimental chamber 21 is reheated by the heating assembly to more quickly complete the melting step of the test piece and improve the freeze-thaw test efficiency of the test piece. After repeating the above freeze-thaw steps multiple times, first drain the water in the experimental chamber 21, then the lifting mechanism 7 drives the experimental box 2 to move downward, and the compressive strength test of the test piece after freeze-thaw is completed through the force application mechanism 6.

[0047] In this embodiment, a heat dissipation cavity 421 is provided on the refrigeration assembly 42, the refrigerating end of the first semiconductor refrigerating sheet 423 is arranged in the experimental cavity 21, and the heating end is arranged in the heat dissipation cavity 421. The second water pump 422 and the second solenoid valve are used to realize the water circulation in the water storage tank 51 and the heat dissipation cavity 421, so as to utilize the heat dissipated by the first semiconductor refrigerating sheet 423 to preliminarily heat the water, so as to improve the rapid thawing of the test piece during the freeze-thaw process and improve the efficiency of the freeze-thaw experiment.

[0048] The heating assembly may be a heating wire arranged in the experimental cavity 21, and the heating wire can also heat the air and water in the experimental cavity 21. In this embodiment, the heating assembly 41 includes a heat dissipation cavity 411, a third water pump 412, a third solenoid valve and a second semiconductor refrigerating sheet 413; the heat dissipation cavity 411 is arranged on the outer side wall of the experimental box 2, the refrigerating end of the second semiconductor refrigerating sheet 413 is arranged in the heat dissipation cavity 411, and the heating end is arranged in the experimental cavity 21; the third water pump 412 is communicated with the heat dissipation cavity 411 and the water storage tank 51 through a pipeline to transfer the water in the water storage tank 51 into the heat dissipation cavity 411; the third solenoid valve is communicated with the third water outlet arranged at the bottom of the heat dissipation cavity 411 and the water storage tank 51 through a pipeline to transfer the water in the heat dissipation cavity 411 into the water storage tank 51.

[0049] The heat dissipation cavity 411 includes a third water inlet arranged on its side wall and a third water outlet arranged at the bottom, and the third water pump 412 is communicated with the third water inlet and the water storage tank 51 through a pipeline. In this embodiment, by arranging the heating end of the second semiconductor refrigerating sheet 413 of the refrigeration assembly 42 in the experimental cavity 21 and the refrigerating end in the heat dissipation cavity 411, and by the third water pump 412 and the third solenoid valve to realize the water circulation in the water storage tank 51 and the heat dissipation cavity 411, the water is preliminarily cooled by using the refrigerating section of the second semiconductor, so as to improve the rapid freezing of the test piece during the freeze-thaw process and improve the efficiency of the freeze-thaw experiment.

[0050] In this embodiment, there are two heat dissipation assemblies and two refrigeration assemblies 42 respectively. The two heat dissipation assemblies are respectively arranged on the left side wall and the right side wall of the experimental cavity 21, and the two refrigeration assemblies 42 are respectively arranged on the front side wall and the rear side wall of the experimental cavity 21, so as to improve the heating efficiency of water and air and thus improve the experimental efficiency.

[0051] Please refer to Figure 1-3, 5, 7, the second environmental simulation mechanism 5 may further include a fourth water pump 53 and a fourth solenoid valve; the water storage tank 51 includes a hot water storage chamber 511 and a cold water storage chamber 512. The first water pump 52 is connected to the hot water storage chamber 511 and the experimental chamber 21 through a pipeline. The first solenoid valve is connected to the hot water storage chamber 511 and the first water outlet provided at the bottom of the experimental chamber 21 through a pipeline; the fourth water pump 53 is connected to the cold water storage chamber 512 and the experimental chamber 21 through a pipeline; the fourth solenoid valve is connected to the cold water storage chamber 512 and the fourth water outlet provided at the bottom of the experimental chamber 21 through a pipeline; the second water pump 422 is connected to the heat dissipation chamber 421 and the hot water storage chamber 511 through a pipeline; the second solenoid valve is connected to the second water outlet at the bottom of the heat dissipation chamber 421 and the hot water storage chamber 511 through a pipeline; the third water pump 412 is connected to the cold dissipation chamber 411 and the cold water storage chamber 512 through a pipeline; the third solenoid valve is connected to the third water outlet at the bottom of the cold dissipation chamber 411 and the cold water storage chamber 512 through a pipeline. That is, the water in the heat dissipation chamber 421 flows into the hot water storage chamber 511, and the water in the cold dissipation chamber 411 flows into the cold water storage chamber 512, so that the cold and hot water will not blend in the water storage tank 51, thereby further improving the efficiency of the freeze-thaw experiment.

[0052] In addition, the second environmental simulation mechanism 5 further includes a plurality of third semiconductor refrigeration chips 54. The cold water storage chamber 512 and the hot water storage chamber 511 are of a square structure, and the cold water storage chamber 512 is located inside the hot water storage chamber 511; at least one third semiconductor refrigeration chip 54 is provided on the side wall of each cold water storage chamber 512. The refrigeration end of the third semiconductor refrigeration chip 54 is located inside the cold water storage chamber 512, and the heating end is located inside the hot water storage chamber 511. Specifically, the cold water storage chamber 512 and the hot water storage chamber 511 are of a rectangular structure, and the cold water storage chamber 512 is wrapped by the hot water storage chamber 511. Four third semiconductor refrigeration chips 54 are provided, and one third semiconductor refrigeration chip 54 is provided on each side wall of the cold water storage chamber 512, so as to simultaneously cool the cold water storage chamber 512 and heat the water in the hot water storage chamber 511, thereby further improving the efficiency of the freeze-thaw experiment.

[0053] On the other hand, the present invention also provides a method for testing a highway subgrade based on waste tire rubber particles, including a device for testing a highway subgrade based on waste tire rubber particles as described above; the method further includes the following steps:

[0054] Specimen placement step: Place the prepared specimen into the experimental chamber 21, and use the force application mechanism 6 to close the opening of the experimental chamber 21; by placing the prepared specimen into the experimental chamber 21 and supporting it by the part of the two support members 3 located inside the experimental box 2, so that most of the area of the specimen is suspended, so as to increase the contact area between the specimen and air and water. After the specimen is placed, the force application mechanism 6 moves downward, and the cover plate is used to seal the opening of the experimental chamber 21 to provide a closed experimental environment inside the experimental box 2.

[0055] Environmental simulation steps: The environment is simulated by the first environmental simulation mechanism 4 and the second environmental simulation mechanism 5; after forming a closed experimental environment, the first environmental simulation mechanism 4 can be used to change the air temperature in the experimental chamber 21, and the second environmental simulation mechanism 5 can be used to maintain the air humidity in the experimental chamber 21, so as to simulate the dry usage scenario of the specimen in actual use and conduct the dry shrinkage and temperature shrinkage experiments of the specimen. The second environmental simulation mechanism 5 is used to add water with a certain temperature into the experimental chamber 21 and the first environmental simulation mechanism 4 is used to heat the water, so as to immerse the specimen, so as to simulate the scenario when the specimen is in rainy weather or flooded in actual use and complete the freeze-thaw and water stability experiments of the specimen. It can be understood that scale lines can be provided on the side wall or bottom wall of the experimental chamber 21 to facilitate recording the length change of the specimen during the dry shrinkage experiment; a temperature strain gauge can be provided in the experimental chamber 21 to facilitate measuring the temperature strain of the specimen during the temperature shrinkage experiment of the specimen. Of course, when conducting relevant experiments, specific facilities or equipment for recording the length change of the specimen and measuring the temperature strain of the specimen can also be added to the experimental box 2 by the operator according to needs. For example, when conducting the dry shrinkage experiment, equipment such as a caliper for recording the length change of the specimen can be placed into the experimental chamber 21 before the experiment. This application does not limit this.

[0056] Compressive strength test steps: The lifting mechanism 7 drives the experimental box 2 to move downward, and then the force application mechanism 6 applies a downward force to the specimen to complete the compressive strength test.

[0057] After simulating the use environment, some experiments also need to conduct compressive strength experiments. For example, when testing the compressive strength of the specimen during the freeze-thaw experiment of the specimen and when conducting the crack resistance experiment on the specimen, the lifting mechanism 7 can drive the experimental box 2 to move downward, so that the force application mechanism 6 applies a downward force to the specimen, and by recording the magnitude of the load applied by the force application mechanism 6 to the specimen, the compressive strength of the specimen can be obtained, so as to realize the compressive strength or crack resistance experiment on the specimen.

[0058] In summary, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0059] The above embodiments are only illustrative of the principles and effects of the present invention and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An experimental device for highway subgrade based on waste tire rubber particles, characterized in that, Comprising: A base, an experimental box, two support members spaced apart on the base, a first environmental simulation mechanism provided on the experimental box, a second environmental simulation mechanism provided on the base, a force application mechanism, and a lifting mechanism; An experimental cavity is provided in the experimental box, the experimental cavity has an opening, and the opening is located at the top of the experimental box; at least a part of the two support members is provided in the experimental cavity for supporting a test piece; The first environmental simulation mechanism is used to change the air temperature and / or the water temperature in the experimental cavity; The second environmental simulation mechanism is connected to the experimental cavity through a pipeline and is used to add water to the experimental cavity to change the air humidity in the experimental cavity and / or soak the test piece; The force application mechanism is used to apply a vertically downward force to the test piece to test the compressive strength of the test piece and to seal the opening of the experimental cavity; The lifting mechanism is connected to the bottom of the experimental box and is used to drive the experimental box to perform a lifting movement, so as to facilitate the force application mechanism to apply a vertically downward force to the test piece and to facilitate the force application mechanism to seal the opening of the experimental cavity; Each support member includes two support feet, two U-shaped bending sections, and a support section; 4 first avoidance openings for avoiding the U-shaped bending sections are provided on the experimental box; one end of the U-shaped bending section is connected to the support foot, and the other end is connected to the support section; the end of the support foot away from the U-shaped bending section is connected to the base; The force application mechanism includes a support seat, a second telescopic driving member, a pressing plate, a cover plate, and two third telescopic driving members; the support seat is provided on the base, and the second telescopic driving member is provided on the support seat; the pressing plate is provided on the movable end of the second telescopic driving member, the pressing plate is used to abut against the test piece, the middle of the cover plate is rotatably connected to the movable end of the second telescopic driving member, and the cover plate is used to seal the opening of the experimental cavity; the fixed ends of the two third telescopic driving members are rotatably connected to the movable end of the second telescopic driving member, the movable end of one of the third telescopic driving members is rotatably connected to the left top of the cover plate, and the movable end of the other third telescopic driving member is rotatably connected to the right top of the cover plate, and the two third telescopic driving members are used to fold the cover plate.

2. The experimental device for highway subgrade based on waste tire rubber particles according to claim 1, characterized in that: The 4 first avoidance openings and the 4 U-shaped bending sections are arranged in one-to-one correspondence; a part of the U-shaped bending section and the support section are located in the experimental cavity; The support feet and the U-shaped bending sections are arranged in one-to-one correspondence.

3. The experimental device for highway subgrade based on waste tire rubber particles according to claim 1, characterized in that: The lifting mechanism includes a fixed seat, a first mounting seat, a guide seat, a second mounting seat, a first telescopic driving member, and two triangular rotating seats; The experimental box is provided on the top of the fixed seat; The first mounting seat, the guide seat, and the second mounting seat are spaced apart on the base; and the first mounting seat and the guide seat are arranged corresponding to the left side of the fixed seat, and the second mounting seat is arranged corresponding to the right side of the fixed seat; The left side wall of the fixed seat is slidably connected to the guide seat, and waist-shaped holes are respectively provided on the right sides of the front side wall and the rear side wall of the fixed seat; The first angles of the two triangular rotating seats are respectively rotationally connected to the second mounting seat, the second angles are respectively rotationally connected to the output ends of the first telescopic driving members, and the third angle of one of the triangular rotating seats is slidably connected to the waist-shaped hole on the front side wall of the fixed seat, and the third angle of the other triangular rotating seat is slidably connected to the waist-shaped hole on the rear side wall of the fixed seat; The fixed end of the first telescopic driving member is rotationally connected to the first mounting seat, and at any moment, the central axis of the first telescopic driving member is arranged non-parallel to the horizontal plane.

4. An experimental device for a highway subgrade based on waste tire rubber particles according to claim 3, characterized in that: The lifting mechanism further includes a rotating shaft and a rolling member, and the rolling member is arranged at one end of the rotating shaft; one end of the rotating shaft is connected to the third angle of the triangular rotating seat, and the other end is connected to the waist-shaped hole through the rolling member; When the lifting mechanism drives the experimental box to move upward to the limit position, the connection line between the first angle and the third angle of the triangular rotating seat is arranged parallel to the perpendicular bisector of the base; When the lifting mechanism drives the experimental box to move downward to the limit position, the connection line between the first angle and the second angle of the triangular rotating seat is arranged parallel to the perpendicular bisector of the base.

5. The experimental device for highway subgrade based on waste tire rubber particles according to claim 1, wherein: The fixed end of the third telescopic driving member, the cover plate, and the connection point of the pressing plate and the movable end of the second telescopic driving member are sequentially arranged at intervals on the movable end of the second telescopic driving member, and the connection point of the pressing plate and the movable end of the second telescopic driving member is located on the side close to the experimental box.

6. The experimental device for highway subgrade based on waste tire rubber particles according to claim 1, characterized in that: The first environment simulation mechanism includes a heating component for heating the air and / or water in the experimental chamber, and a refrigeration component for refrigerating the air and / or water in the experimental chamber; The second environment simulation mechanism includes a water storage tank, a first water pump, and a first solenoid valve; the first water pump is communicated with the water storage tank and the experimental chamber through a pipeline to transfer the water in the water storage tank to the experimental chamber, and the first solenoid valve is communicated with the water storage tank and a first water outlet arranged at the bottom of the experimental chamber through a pipeline to transfer the water in the experimental chamber to the water storage tank; The refrigeration component includes a heat dissipation chamber, a second water pump, a second solenoid valve, and a first semiconductor refrigeration sheet; the heat dissipation chamber is arranged on the outer side wall of the experimental box, the refrigeration end of the first semiconductor refrigeration sheet is arranged in the experimental chamber, and the heating end is arranged in the heat dissipation chamber; the second water pump is communicated with the heat dissipation chamber and the water storage tank through a pipeline to transfer the water in the water storage tank to the heat dissipation chamber; the second solenoid valve is connected to a second water outlet arranged at the bottom of the heat dissipation chamber and the water storage tank through a pipeline to transfer the water in the heat dissipation chamber to the water storage tank; A detection member is further arranged in the experimental box, and the detection member is used for detecting the temperature and / or humidity in the experimental chamber.

7. An experimental device for a highway subgrade based on waste tire rubber particles according to claim 6, characterized in that: The heating component includes a heat dissipation chamber, a third water pump, a third solenoid valve, and a second thermoelectric cooler; the heat dissipation chamber is arranged on the outer side wall of the experimental box, the refrigerating end of the second thermoelectric cooler is arranged in the heat dissipation chamber, and the heating end is arranged in the experimental chamber; the third water pump is communicated with the heat dissipation chamber and the water storage tank through pipelines to transfer the water in the water storage tank to the heat dissipation chamber; the third solenoid valve is communicated with a third water outlet arranged at the bottom of the heat dissipation chamber and the water storage tank through pipelines to transfer the water in the heat dissipation chamber to the water storage tank.

8. An experimental device for a highway subgrade based on waste tire rubber particles according to claim 7, characterized in that: The second environment simulation mechanism further includes a fourth water pump and a fourth solenoid valve; the water storage tank includes a hot water storage chamber and a cold water storage chamber, the first water pump is connected with the hot water storage chamber and the experimental chamber through pipelines, and the first solenoid valve is connected with the hot water storage chamber and a first water outlet arranged at the bottom of the experimental chamber through pipelines; the fourth water pump is connected with the cold water storage chamber and the experimental chamber through pipelines; the fourth solenoid valve is connected with the cold water storage chamber and a fourth water outlet arranged at the bottom of the experimental chamber through pipelines; The second water pump is connected with the heat dissipation chamber and the hot water storage chamber through pipelines; the second solenoid valve is connected with a second water outlet at the bottom of the heat dissipation chamber and the hot water storage chamber through pipelines; The third water pump is connected with the heat dissipation chamber and the cold water storage chamber through pipelines; the third solenoid valve is connected with a third water outlet at the bottom of the heat dissipation chamber and the cold water storage chamber through pipelines.

9. An experimental device for highway subgrade based on waste tire rubber particles according to claim 8, characterized in that: The second environment simulation mechanism further includes a plurality of third thermoelectric coolers, the cold water storage chamber and the hot water storage chamber are of a square structure, and the cold water storage chamber is located inside the hot water storage chamber; at least one of the third thermoelectric coolers is arranged on the side wall of each cold water storage chamber, the refrigerating end of the third thermoelectric cooler is located inside the cold water storage chamber, and the heating end is located inside the hot water storage chamber.

10. An experimental method for highway subgrade based on waste tire rubber particles, characterized in that: It includes a highway subgrade experimental device based on waste tire rubber particles according to any one of claims 1-9; the following steps are further included: Specimen placement step: Place the prepared specimen into the experimental chamber, and use the force application mechanism to seal the opening of the experimental chamber; Environment simulation step: Simulate the environment through the first environment simulation mechanism and the second environment simulation mechanism; Compressive strength test step: Drive the experimental box to move downward through the lifting mechanism, and then use the force application mechanism to apply a downward acting force on the specimen to complete the compressive strength test.

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